Valve drive of an internal combustion engine

A valve drive of an internal combustion engine with variable-lift gas exchange valve actuation. The valve drive has a camshaft with a support shaft and a cam piece arranged on the support shaft for conjoint rotation therewith and to be movable between axial positions. The cam piece has two cam groups of directly adjacent cams with different elevations and, on the end side, the cam piece has an axial slotted guide into which can be coupled an actuating element. The cam piece has a bearing journal which runs between the cam groups and rotatably mounted in a camshaft bearing point arranged in a positionally fixed manner in the engine. Here, the diameter of the bearing journal is larger than the envelope circle diameter of a cam closest to the bearing journal with the cam and camshaft bearing point overlapping axially in an axial position of the cam piece.

Variable valve train for internal combustion engines for actuating gas exchange valves

A variable valve train for actuating a plurality of gas exchange valves of an internal combustion engine includes a plurality of individual cam sleeves axially displaceable relative to one another and disposed so as to form the camshaft. Each of the plurality of individual cam sleeves include a plurality of different cam profiles. A switching shaft is disposed inside the plurality of cam sleeves and is configured to rotate together with the plurality of cam sleeves. A switching ball operatively connects one of the plurality of cam sleeves to a switching contour disposed on the switching shaft. A displacement piece is disposed so as to be rotationally engaged but axially displaceable on one of the plurality of cam sleeves and connected to the switching shaft. An actuator is operatively connectable to the displacement piece by the switching ball so as to displace the one of the plurality of cam sleeves.

Valve drive for internal combustion engines for actuating gas exchange valves

A valve drive device for switching the stroke of gas exchange valves of an internal combustion engine includes a camshaft configured, at least in part, as a hollow shaft. A cam unit includes at least two different cams disposed on the camshaft so as to be rotationally engaged and axially displaceable with respect thereto. An adjustment sleeve is disposed so as to be rotationally engaged on an adjustment shaft and rotatable and axially displaceable inside the camshaft. The adjustment sleeve includes thereon a closed adjustment contour extending about a circumference of the adjustment sleeve and is operatively connected to the cam unit through an adjustment clearance in the camshaft via a first coupling element configured to permanently engage in the adjustment contour. A further coupling element is configured to permanently engage in the adjustment contour and connect to the camshaft so as to be fixed in position.

Valve operating apparatus for internal combustion engine

Provided is a valve operating apparatus for an internal combustion engine that, with respect to a configuration including urging means that urges a transfer member that transfers an acting force of a cam to a valve, can facilitate manufacture of a support portion of the urging means and suppress an increase in the mass of the internal combustion engine. A first rocker arm is provided that is interposed between a main cam and a valve and that transfers an acting force of the main cam to the valve. A lost motion mechanism is provided that urges the first rocker arm in one direction. A holding member is provided that holds the lost motion mechanism. The lost motion mechanism is attached to a spark plug tube through the holding member.

Sliding cam system havnig slide grooves and locking means

A sliding cam system having sliding cams ( 1 ) which are arranged so as to be non- rotatable yet axially displaceable on a main shaft, preferably on a shaft serving as the camshaft of a reciprocating internal combustion engine, having a preferably electromagnetically operable device including at least one extendable actuator pin ( 6 ) for displacing the sliding cams into different axial positions via the displacement grooves ( 3 ) on the circumference of the sliding cams, wherein the displacement grooves interact with the actuator pin ( 6 ) and a displacement device ( 5 ) is fixedly arranged on a component of the internal combustion engine. The system has a device for locking the sliding cams ( 1 ) in different axial positions, and the locking device includes at least one recess associated with each axial position. The recesses are in the form of locking grooves ( 2 ) on a circumference of the sliding cams ( 1 ) and the entry and exit regions of the displacement grooves ( 3 ) lie in the planes of two adjacent locking grooves ( 2 ).

Internal combustion engine valve actuation control arrangement

In an internal combustion engine a valve actuation control arrangement is provided, which has at least three independently axially displaceable cam elements and a switch gate which has at least one continuous gate track for displacing the at least three cam elements sequentially one after the other.

Electromagnetic Control Device, In Particular for Adjusting Camshafts of an Internal Combustion Engine

The application relates to an electromagnetic control device, in particular for adjusting camshafts or a camshaft section of an internal combustion engine, comprising: an energizable coil unit via which, in the energized state, an armature mounted for movement along a longitudinal axis of the control device can be moved relative to a pole core between a retracted position and an extended position; a tappet which interacts with the armature and is mounted for movement along the longitudinal axis, having a free end, via which the tappet interacts with the camshaft in the extended position in order to adjust the camshaft; and an adapter, via which the control device can be fastened to a component, in particular to cylinder head cover, wherein the armature and the tappet are connected to each other for conjoint rotation, and the control device has a first bearing section inside the adapter for rotatable mounting of the tappet and a second bearing section outside of the adapter for rotatable mounting of the tappet and/or the armature. 1. An electromagnetic control device , comprising:an armature;an energizable coil unit, with which the armature is mounted to be movable along a longitudinal axis of the control device in an energized condition and is movable between a retracted position and an extended position relative to a pole core;a tappet which interacts with the armature and is mounted for movement along the longitudinal axis and has a free end by which the tappet interacts with a camshaft in the extended position for adjusting the camshaft;an adapter to a cylinder head cover;a first bearing section within the adapter for rotational bearing of the tappet;a second bearing section outside of the adapter for rotatable mounting of the tappet and/or the armature; andwherein the armature and the tappet are connected to one another for conjoint rotation.2. The control device according to claim 1 , wherein the second bearing section is made of a nonmagnetic or ...

VARIABLE VALVE OPERATING APPARATUS

An engine variable valve operating apparatus includes a cam switching mechanism having a switching drive shaft. When the switching drive shaft is longitudinally moved, a cam mechanism advances and retracts a switching pin. When the switching pin is advanced to engage in a lead groove formed around a cam carrier and the cam carrier is axially moved while rotating, cam lobes around the cam carrier are switched to act on an engine valve. An actuator for the switching drive shaft includes an actuator drive body which is linearly reciprocally movable and is coupled to a longitudinal end of the switching drive shaft to axially move the same. The above arrangement enables the cam switching mechanism and the actuator mechanism to be simple and compact in structure for preventing the engine from becoming large in size. 1. A variable valve operating apparatus comprising:a camshaft rotatably mounted in a cylinder head superposed on a cylinder block of an internal combustion engine;a cam carrier in the form a hollow cylindrical member relatively non-rotatably and axially slidably fitted around the camshaft and including, on an outer circumferential surface thereof, a plurality of cam lobes having different cam profiles and disposed axially adjacent to each other; anda cam switching mechanism for axially moving the cam carrier to switch the cam lobes to act on an engine valve; a lead groove formed in an outer circumferential surface of the cam carrier and extending fully circumferentially therearound;', 'a switching pin capable of being advanced to engage in and retracted to disengage from the lead groove;', 'a switching drive shaft disposed parallel to the camshaft to be movable longitudinally thereof so as to cooperate with the switching pin to constitute a cam mechanism for advancing and retracting movements of the switching pin, in such a manner that the advancing movement causes the switching pin to engage in the lead groove so as to axially move the cam carrier while ...

INTERNAL COMBUSTION ENGINE

An internal combustion engine is provided with a variable valve operating apparatus, for use on a saddle-type vehicle. When a switching drive shaft is longitudinally moved under hydraulic pressure switched by a solenoid valve, a cam mechanism advances and retracts a switching pin. When the switching pin is advanced to engage in a lead groove in a cam carrier, the cam carrier is axially moved while rotating, to switch cam lobes to act on an engine valve. A solenoid valve is disposed on a left or right end in the leftward and rightward directions across the vehicle width, of a front or rear surface of a cylinder head. The solenoid valve is placed in an appropriate location in the cylinder head out of interference with other parts of the engine, thereby making the vehicle small in size. 1. An internal combustion engine for use on a saddle-type vehicle , including a cylinder block and a cylinder head stacked on and integrally fastened to a crankcase , the internal combustion engine having a variable valve operating apparatus comprising:a camshaft rotatably mounted in the cylinder head and oriented in leftward and rightward directions across a vehicle width;a cam carrier in the form of a hollow cylindrical member relatively non-rotatably and axially slidably fitted over the camshaft, the cam carrier including, on an outer circumferential surface thereof, a plurality of cam lobes having different cam profiles and disposed axially adjacent to each other; anda cam switching mechanism for axially moving the cam carrier to switch the cam lobes to act on an engine valve; a lead groove formed in an outer circumferential surface of the cam carrier and extending fully circumferentially therearound;', 'a switching pin capable of being advanced to engage in and retracted to disengage from the lead groove;', 'a switching drive shaft disposed parallel to the camshaft to be movable longitudinally thereof so as to cooperate with the switching pin to constitute a cam mechanism for ...

VARIABLE VALVE TRAIN

The disclosure concerns a variable valve train for an internal combustion engine, comprising a camshaft, a gas exchange valve and a cam carrier. The cam carrier is arranged rotationally fixedly and axially displaceably on the camshaft and has a first cam and a second cam. The variable valve train has a force transmission device with a force transmission element, in particular a finger follower or rocker arm, which, depending on an axial position of the cam carrier, creates an active connection either between the first cam and the gas exchange valve or between the second cam and the gas exchange valve. The variable valve train has a first actuator for axial displacement of the cam carrier, wherein the first actuator is received at least partially in the force transmission device. 1. A variable valve train for an internal combustion engine , comprising:a camshaft;a gas exchange valve;a cam carrier which is arranged rotationally fixedly and axially displaceably on the camshaft and has a first cam and a second cam;a force transmission device with a force transmission element, in particular a finger follower or rocker arm, which, depending on an axial position of the cam carrier, creates an active connection either between the first cam and the gas exchange valve or between the second cam and the gas exchange valve; anda first actuator for axial displacement of the cam carrier, wherein the first actuator is received at least partially in the force transmission device.2. The variable valve train according to claim 1 , wherein:the force transmission device has a lever shaft, in particular a rocker arm shaft or a finger follower shaft, andthe first actuator is received at least partially in the lever shaft.3. The variable valve train according to claim 1 , wherein:the force transmission device has a lever shaft bearing block, andthe first actuator is received at least partially in the lever shaft bearing block.4. The variable valve train according to claim 1 , wherein:the ...

Determining sliding camshaft actuator pin position based on engine crankshaft angle

A method of determining a sliding camshaft actuator pin position based on engine crankshaft angle includes commanding a sliding camshaft actuator to perform a valve step shift, and monitoring an actuator's pin position during the valve step shift command. At least one crank angle is measured when the actuator pin position reaches or exceeds at least one predetermined pin position threshold and at least one remedial action is performed when the actuator pin position does not correlate to the at least one measured crank angle.

Continuous variable valve timing apparatus and engine provided with the same

A continuously variable valve timing apparatus may include a camshaft, a first and a second cam portions of which two cams are formed thereto, of which the camshaft is inserted thereinto and of which relative phase angles with respect to the camshaft are variable, a first and a second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively, a first and a second slider housings of which the first and second inner brackets are rotatably inserted thereinto respectively and of which relative positions with respect to the camshaft are variable, a control shaft connected with the slider housings and a control portion connected with the control shaft and selectively changing the positions of the inner brackets.

Cam for a Camshaft

A cam having at least two part cams are arranged axially behind one another along a longitudinal axis includes an undercut between the cam parts. The part cams have running faces which lie radially on the outside of the part cams and have different variable running face contours. The undercut has a profile with a variable contour which is dependent in each case on that adjacent running face contour which is at a smaller radial spacing from the longitudinal axis than the other running face contour.

METHOD FOR ASSEMBLING A CAMSHAFT IN A MODULE BODY

A camshaft may comprise a main shaft, on which at least two sliding cam pieces are accommodated in a rotationally fixed and axially displaceable manner, wherein the sliding cam pieces each comprise a carrier tube, on which are seated cam groups each comprising at least two cam tracks for valve-control purposes, as well as an adjustment element that can be brought into operative connection with an actuator for axial displacement of the two sliding cam pieces. A method for assembling such a camshaft may involve providing a module body with bearing bridges that receive the camshaft in a rotatable manner, inserting a first sliding cam piece into a first bearing bridge, connecting the first sliding cam piece to the adjustment element, inserting a second sliding cam piece into a second bearing bridge, and connecting the second sliding cam piece to the adjustment element with the aid of an axial adjustment distance of at least one of the sliding cam pieces in the bearing bridges. 110.-. (canceled)11. A method for assembling a camshaft that comprises a main shaft on which at least two sliding cam pieces are disposed in a rotationally-fixed and axially-displaceable manner , wherein each of the at least two sliding cam pieces comprises cam groups seated on a carrier tube , wherein each cam group comprises at least two cam tracks for valve-control purposes , the camshaft further comprising an adjustment element that can be brought into operative connection with an actuator for axially displacing the at least two sliding cam pieces , the method comprising:providing a module body that has bearing bridges for receiving the camshaft in a rotatable manner;inserting a first sliding cam piece of the at least two sliding cam pieces into a first bearing bridge of the bearing bridges;connecting the first sliding cam piece to the adjustment element;inserting a second sliding cam piece of the at least two sliding cam pieces into a second bearing bridge of the bearing bridges; ...

Sliding cam system

A sliding cam system for an internal combustion engine. The sliding cam system includes a cam shaft and a cam carrier, arranged rotationally fixedly and axially movably on the cam shaft. The cam carrier including a first shifting gate and a second shifting gate. The sliding cam system includes a first actuator with an element able to move along a longitudinal axis of the cam shaft, especially a pin, which can be brought into contact with the first shifting gate for the axial movement of the cam carrier in a first direction. The sliding cam system includes a second actuator with an element able to move along the longitudinal axis of the cam shaft, especially a pin, which can be brought into contact with the second shifting gate for the axial movement of the cam carrier in a second direction which is opposite to the first direction.

Sliding cam system and method for operating an internal combustion engine

A sliding cam system for a variable valve train. The sliding cam system includes a camshaft, a cam carrier, a cam follower, and a first actuator. A first cam of the cam carrier and a second cam of the cam carrier are arranged offset with respect to one another along a longitudinal axis of the camshaft. The first cam comprises a base circle region and a valve lift region with a limiting section which adjoins the base circle region of the first cam. The second cam has a base circle region and a valve lift region with a limiting section which adjoins the base circle region of the second cam. The limiting section of the first cam and the limiting section of the second cam are of identical configuration and are arranged at an identical circumferential position about the longitudinal axis of the camshaft.

Internal Combustion Engine Valve Train Adjustment Device

A device for adjusting a motor vehicle valve train includes at least one camshaft with at least four cam elements arranged in an axially displaceable manner. In each case two of the cam elements that are adjacently situated are formed as a cam element group to be switched together.

VARIABLE VALVE CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINES

The invention relates to a variable valve control device () for internal combustion engines of the reciprocating-piston design having at least one gas exchange valve, which can be actuated by a camshaft () by means of a cam device () that is connected to the camshaft () for conjoint rotation and that has at least two different cam tracks (), which camshaft is supported in such a way that the camshaft can be rotated about a camshaft axis (), wherein, selectively, one of the cam tracks () can be activated and at least one other cam track () can be deactivated by means of a control device (), and wherein the control device () has at least one control element (), which is guided axially, in particular within the camshaft, and by which at least one cam device () that is supported on the camshaft () for conjoint rotation but axially movably and that has at least two different cam tracks () can be adjusted by means of at least one driving piece (). In order to enable reliable and fail-safe variable valve actuation in the simplest possible manner, at least one blocking element () is provided for blocking and releasing the axial adjustment motion of the cam device (), wherein the blocking element () has a control stud () fixedly connected to the cam device () and a—preferably stationary—control disk () arranged coaxial to the camshaft (), wherein the control disk () has, in at least one angular region, at least one control opening () for receiving the control stud (). 11324378788710101112437820420214223222521. A variable valve control device () for internal combustion engines of the reciprocating piston design comprising at least one gas exchange valve , which is actuable by means of a camshaft () , which is mounted so it is rotatable about a camshaft axis () , via a cam device () , which is connected to the camshaft () in a rotationally-fixed manner and has at least two different cam tracks ( , ) , wherein alternately one of the cam tracks ( , ) is activatable and at least ...

ELECTROMAGNETIC ACTUATOR

An electromagnetic actuator having at least one electromagnetic actuator unit, the actuator unit comprising a coil and a plunger, which plunger is axially movable relative to the coil via energization of the coil, and the actuator unit being arranged in a housing. In order to achieve a particularly simple design, the plunger is arranged approximately coaxially with the coil according to the invention. 1. An electromagnetic actuator with at least one electromagnetic actuator unit , the actuator unit having a coil and a plunger , which plunger can be moved axially relative to the coil by energizing the coil , wherein the actuator unit is arranged in a housing , wherein plunger is arranged approximately coaxially with coil.2. The electromagnetic actuator according to claim 1 , wherein at least two actuator units are provided claim 1 , plungers are arranged approximately coaxially with coils in all actuator units claim 1 , with all actuator units preferably arranged in a common housing.3. The electromagnetic actuator according to claim 1 , wherein plunger can move from an end position close to the core to an end position away from the core claim 1 , and plunger in end positions rests against stops.4. The electromagnetic actuator according to claim 1 , wherein a permanent magnet is arranged on the plunger.5. The electromagnetic actuator according to claim 4 , wherein coil is arranged around a core claim 4 , a permanent magnet being magnetically separated from the core in the axial direction only through an air gap.6. The electromagnetic actuator according to claim 1 , wherein an anchor element claim 1 , in particular an anchor plate claim 1 , is arranged on the plunger.7. The electromagnetic actuator according to claim 1 , wherein a permanent magnet and an armature element are arranged claim 1 , whereas the armature element protruding beyond permanent magnet in a plane perpendicular to a longitudinal axis of the actuator.8. The electromagnetic actuator according to claim ...

Sensor assembly for a sliding camshaft of a motor vehicle

A sensor assembly for a sliding camshaft of a motor vehicle is provided. The sliding camshaft includes a base shaft that extends along a longitudinal axis and rotates about the longitudinal axis. The sliding camshaft further includes lobe banks rotationally fixed to the base shaft. Each lobe bank is axially movable between first and second positions relative to the base shaft. The sensor assembly includes a detection element rotationally fixed relative to the base shaft and axially movable between first and second positions relative to the base shaft. The sensor assembly further includes a sensor operably coupled to the detection element and configured to generate a signal indicative of an axial position of the detection element relative to the base shaft and at least one of an angular speed of the base shaft and an angular position of the base shaft about the longitudinal axis.

SLIDING CAMSHAFT ASSEMBLY

A camshaft assembly includes a base shaft, an axially movable structure having a barrel cam and a plurality of lobe packs, and an actuator. The barrel cam defines a single control groove having an enlarged region and a converged region. The actuator includes an actuator body with first and second pins. Each of the first and second pins moves relative to the actuator body between a retracted position and an extended position. The axially movable structure may move from a first position to a second position when the second pin rides along at least a portion of a second side of the enlarged region and then enters the converged region. The axially movable structure may also move from a second position to a first position when the first pin rides along at least a portion of a first side of the enlarged region before entering the converged region. 1. A camshaft assembly comprising:a base shaft extending along a longitudinal axis, the base shaft being configured to rotate about the longitudinal axis;an axially movable structure mounted on the base shaft, the axially movable structure being axially movable relative to the base shaft, the axially movable structure being rotationally fixed to the base shaft, wherein the axially movable structure includes:a plurality of lobe packs, each of the lobe packs including a plurality of cam lobes, wherein the axially movable structure includes a barrel cam, the barrel cam defines a control groove, and the control groove defines a single path around a circumference of the barrel cam wherein the single path is defined by an enlarged region and a converged region;an actuator including an actuator body and first and second pins each movably coupled to the actuator body such that each of the first and second pins is movable relative to the actuator body between a retracted position and an extended position, wherein the first and second pins are configured to ride along the single path defined by the control groove;wherein the axially ...

CAMSHAFT

A camshaft may have a bearing shaft configured as a hollow shaft in which an inner shaft is disposed concentrically relative to the bearing shaft. The inner shaft may be twistable relative to the bearing shaft. A first cam segment having a first recess for receiving the bearing shaft may be disposed on the bearing shaft, may be rotatable relative to the bearing shaft, and may be connected in a rotationally fixed and axially fixed manner to the inner shaft. A second cam segment having a second recess for receiving the bearing shaft may be disposed on the bearing shaft. The second cam segment may have at least two cam contours and may be fastened on the bearing shaft so that the second cam segment is rotationally fixed to the bearing shaft and arranged in an axially displaceable manner on the bearing shaft.” 117-. (canceled)18. A camshaft comprising:a bearing shaft configured as a hollow shaft;an inner shaft disposed concentrically within an interior of the bearing shaft, wherein the inner shaft is twistable relative to the bearing shaft;a first cam segment with a first recess that receives the bearing shaft, wherein the first cam segment is disposed rotatably on the bearing shaft, wherein the first cam segment is axially connected to the inner shaft in a rotationally fixed manner; anda second cam segment with a second recess that receives the bearing shaft and with at least two cam contours, wherein the second cam segment is fastened on the bearing shaft so that the second cam segment is connected to the bearing shaft in a rotationally fixed manner, wherein the second cam segment is axially displaceable along the bearing shaft.19. The camshaft of wherein the first cam segment is axially connected to the inner shaft in a rotationally fixed manner by a connection means.20. The camshaft of further comprising a latching means for latching the second cam segment at a plurality of axial positions.21. The camshaft of wherein the latching means is disposed at least in part ...

VALVE TRAIN ASSEMBLY

A valve train assembly has at least a camshaft with at least a first cam body and a second cam body, each axially movable over the camshaft between a first axial position and a second axial position and each earn body being provided with a first cam for controlling a valve in the first axial position and a second cam for controlling the valve in the second axial position; and one or more couplers for coupling the movement of the cam bodies. A first groove extends along a part of the circumference of the first cam body. A second groove extends along a part of the circumference of the second cam body, An engager for engaging alternately the first. and second groove is included, such that either the first cam body is moved to the first axial position or the second cam body is moved to the second axial position. 1: A valve train assembly comprising:a camshaft including a first cam body and a second cam body, each cam body being axially movable over the camshaft between a first axial position and a second axial position, and each cam body including a first cam configured to control a valve in the first axial position and a second cam configured to control the valve in the second axial position;a coupler configured to couple a movement of the first cam body and the second cam body;a first groove extending along a part of a circumference of the first cam body;a second groove extending along a part of a circumference of the second cam body; andan engager configured to alternately engage the first and second groove, such that either the first cam body is moved to the first axial position or the second cam body is moved to the second axial position.2: The assembly of claim 1 , wherein the engager includes a first movable pin configured to engage in the first groove and a second movable pin configured to engage in the second groove.3: The assembly of claim 2 , wherein the engager further includes a solenoid connected to each movable pin claim 2 ,wherein the solenoid is ...

Electromagnetic actuator

The magnetic resistance of a magnetic path that passes through a coil ( 6 ) is increased by magnetically dividing a stator core into a plurality of divided cores ( 4, 5 ) in such a manner that the magnetic flux of a permanent magnet ( 7 ) flows through the magnetic path when a projection ( 82 ) of a plunger ( 8 ) magnetically connects the divided cores ( 4, 5 ), hence the magnetic resistance of the magnetic path that passes through the coil ( 6 ) rapidly changes due to a positional relationship between a gap between the divided cores ( 4, 5 ) and the plunger ( 8 ), and the magnetic flux that flows through the magnetic path rapidly changes, and moreover a large back electromotive force is produced.

VARIABLE VALVE TRAIN

A variable valve train of an internal combustion engine has cylindrical cam carriers axially slidably and co-rotatably fitted on camshafts, respectively. The cam carriers have, respectively, first cam lobes and second cam lobes different in cam profile and axially adjacent to each other. Cam changeover mechanisms operate to axially shift the cam carriers to change over the first cam lobes and the second cam lobes to operate engine valves. An axial recess is formed in an axial end surface of an enlarged-diameter portion of the camshaft for axial insertion of an end of the cam carrier. The engine can thus be reduced in axial size, and a required axial shifting space for the cam carrier is secured. 16-. (canceled)7. A variable valve train of an internal combustion engine , comprising:a camshaft rotatably supported in a cylinder head of the internal combustion engine;a cylindrical cam carrier fitted on and around the camshaft in a manner axially slidable relative to the camshaft but prevented from rotation relative to the camshaft, the cam carrier being formed therearound with a plurality of cam lobes different in cam profile and axially adjacent to each other; anda cam changeover mechanism for axially shifting the cam carrier to change over the cam lobes for operating an engine valve,wherein the camshaft has, on an axial end thereof, an enlarged-diameter portion with an axial end surface with which one end of the cam carrier around the camshaft is adapted to abut axially,;wherein said cam carrier has therearound a lead groove cylindrical portion having therearound a lead groove, which changeover pins are engaged with or disengaged from to axially shift the cam carrier,wherein said lead groove cylindrical portion has an outer diameter smaller than an outer diameter of a base circle of the cam lobes, andwherein the axial end surface of the enlarged-diameter portion composes an axial recess for axially receiving an end of said lead groove cylindrical portion of the cam ...

CONTINUOUS VARIABLE VALVE DURATION APPARATUS AND ENGINE PROVIDED WITH THE SAME

A continuous variable valve duration apparatus may include camshaft, first and second cam portions of cam is formed thereto respectively, of which the camshaft is inserted thereto and of which relative phase angles with respect to the camshaft are variable, first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively, first and second slider housings of which the first and second inner brackets are rotatably inserted thereto and of which relative position with respect to the camshaft are variable, cam cap rotatably supporting the first and second cam portions respectively and of which each slider housing is slidably mounted thereto, control shaft disposed parallel to the camshaft and engaged with the first and second slider housings for selectively moving the first and second slider housings and a control portion selectively rotating the control shaft for changing positions of the inner brackets. 1. A continuous variable valve duration apparatus comprising:a camshaft;first and second cam portions of a cam formed thereto respectively, of which the camshaft is inserted thereto and of which relative phase angles with respect to the camshaft are variable;first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively;first and second slider housings of which the first and second inner brackets are rotatably inserted thereto and of which relative position with respect to the camshaft are variable;a cam cap rotatably supporting the first and second cam portions respectively and of which each slider housing is slidably mounted thereto;a control shaft disposed parallel to the camshaft and engaged with the first and second slider housings for selectively moving the first and second slider housings; anda control portion selectively rotating the control shaft for changing positions of the inner brackets.2. The continuous variable valve duration apparatus of claim ...

Device for a valve train for switching over the lift of gas-exchange valves of an internal combustion engine

A device for a valve train for switching over the lift of gas-exchange valves of an internal combustion engine comprising a camshaft on which at least one cam carrier with at least three different cam profiles is mounted so as to be non-rotatable and axially movable. The device includes an adjustment shaft arranged parallel to the camshaft and on which a first transmission element is mounted so as to be non-rotatable and axially movable, the first transmission element having a guide unit, a housing-fixed first guide element operatively connected to the guide unit, a second guide element operatively connected, on the one hand, to the guide unit and, on the other hand, to the cam carrier via a second transmission element, the second transmission element being connected to the cam carrier so as to be axially unmovable, and a push element operatively connected to the first transmission element.

VARIABLE DISPLACEMENT SOLENOID CONTROL

Methods are provided for improved control of valve activation/deactivation mechanisms. One example method comprises, adjusting an electromechanical actuator to actuate cylinder valve deactivation/activation mechanisms. The actuator is operated at multiple levels based on engine operating conditions. 1. An engine method , comprising:adjusting an electromechanical actuator to slide cam-lobes across a camshaft to change cylinder valve opening durations, including operating the actuator at a first level without a valve transition, operating the actuator at a second level without a valve transition in response to an increased potential for a valve transition, and operating the actuator at a third level inducing a valve transition, the second level between the first and third levels.2. The method of claim 1 , wherein the second level is higher than the first level claim 1 , and wherein the potential for the valve transition is increased based on increased or decreased depression by an operator of an accelerator pedal.3. The method of claim 1 , wherein the increased potential for valve transition includes the engine operating at a lower load than when the actuator was at the first level claim 1 , wherein the cylinder valve opening and closing durations include a first profile with valve lift duration claim 1 , and a second profile with no lift.4. The method of claim 1 , wherein the method further comprises operating the actuator at a fourth level maintaining the valve transition after operating the actuator at the third level claim 1 , the fourth level lower than the third level claim 1 , but higher than the first and second level.5. The method of claim 4 , wherein operating at the second level immediately follows operating at the first level claim 4 , and operating at the third level immediately follows operating at the second level claim 4 , and operating at the fourth level immediately follows operating at the third level.6. The method of claim 4 , wherein the engine ...

SLIDING CAM MODULE WITH A BEARING ELEMENT AND A CAMSHAFT WITH A SLIDING CAM MODULE, AS WELL AS A COVER MODULE

The present invention relates to a sliding cam module for a camshaft, which comprises at least one sliding cam with at least one cam segment, comprising at least two cams with cam tracks that are different to one another as well as a closed bearing element, which is arranged on the sliding cam in a rotatable and axially non-displaceable manner for mounting the sliding cam, wherein the bearing element comprises a recipient area to hold at least one section of a locking device to lock the sliding cam in an axial position. Furthermore, the invention relates to a camshaft with at least one corresponding sliding cam module as well as a shaft, on which the sliding cam module is arranged in a rotationally fixed manner and can be moved in an axial direction along a longitudinal axis of the shaft and a cover module, which comprises a cylinder-head cover as well as a closed bearing element, which comprises a recipient area to hold at least one section of a locking device to lock the sliding cam in an axial position. 1. A sliding cam module for a camshaft , which comprises at least one sliding cam with at least one cam segment , comprising at least two cams with cam tracks that are different to one another as well asa closed bearing element, which is arranged on the sliding cam in a rotatable and axially non-displaceable manner for mounting the sliding cam, wherein the bearing element comprises a recipient area to hold at least one section of a locking device to lock the sliding cam in an axial position.2. The sliding cam module according to claim 1 , whereinthe locking device comprises a spring element as well as an engagement element interacting with the spring element.3. The sliding cam module according to claim 1 , whereinthe recipient area is a blind hole extending inwardly in the radial direction to receive at least the spring element of the locking device.4. The sliding cam module according to claim 1 , whereinthe recipient area is a latching element to hold the ...

VARIABLE VALVE TRAIN

A variable valve train is provided with cylindrical cam carriers axially slidably and co-rotatably supported on camshafts. The cam carriers have thereon, respectively, plural cam lobes different in cam profile and axially adjacent to each other. Cam changeover mechanisms are provided for axially shifting the cam carriers and for changing over the cam lobes for operating on engine valves. At least one of the cam changeover mechanisms is disposed between axes of the two camshafts and on the side of an engine crankshaft relative to the axes. 17.-. (canceled)8. A variable valve train of an internal combustion engine , comprising:two camshafts rotatably supported in a cylinder head of the internal combustion engine;a crankshaft for the engine;cylindrical cam carriers coaxially surrounding the camshafts, respectively, to be rotatable with and axially slidable relative to the camshafts, the cam carriers having thereon a plurality of cam lobes for operating engine valves and being different in cam profile and axially adjacent to each other; andcam changeover mechanisms for axially shifting the cam carriers to change over the cam lobes for operating the engine valves, changeover pins provided for advancing and retracting movements for fitting engagement with and disengagement from lead grooves formed around the cam carriers; and', 'changeover driving shafts provided with cam mechanisms for operating the changeover pins to advance and retract for fitting engagement with and disengagement from the lead grooves,, 'wherein the cam changeover mechanisms include respectivelywherein the cam lobes are operable to act on the engine valves by way of rocker arms, andwherein the rocker arms are rockably supported on the changeover driving shafts.9. The variable valve train according to claim 8 , wherein the lead grooves and the changeover driving shafts for operating the changeover pins are so related as to change over the cam lobes for operating the engine valves.10. The variable valve ...

Variable valve train

An engine variable valve train is provided with a cylindrical cam carrier fitted on a camshaft in a manner axially slidable to and co-rotatable with the camshaft. The cam carrier has therearound mutually adjoining low-speed and high-speed cam lobes selectively acting on the engine valve and being different in cam profile. The cam carrier has therearound lead grooves to be engaged with or disengaged from changeover pins for axial shift of the cam carrier. The lead grooves include a speed-increasing lead groove for changeover from the low-speed to the high-speed cam lobe and a speed-decreasing lead grooves for changeover from the high-speed to the low-speed cam lobe. The speed-increasing and speed-decreasing lead grooves are different in groove contour. This enables the cam carrier to axially shift smoothly and to improve the durability of the lead grooves.

Valve Train Device

A valve train device, in particular for an internal combustion engine, includes a support element secured to a housing, at least one axially moveable cam unit associated with a valve, and at least one switch unit for axially moving at least one part of the cam unit having at least one displacement body which is provided to be introduced for axial movement at least functionally between the support element and the cam unit. The cam unit has at least three cam paths. 19.-. (canceled)10. A valve train device , comprising:a support element secured to a housing;an axially shiftable cam unit that is associated with a valve;a switch unit for axially shifting the cam unit, wherein the switch unit has a first displacement body and a second displacement body;wherein the cam unit has a first cam track, a second cam track, and a third cam track;wherein the first displacement body and the second displacement body are separable from the cam unit at a same time in a switch preparation for activating and/or deactivating the third cam track; anda shifting element, wherein at least a part of the switch unit is axially adjustable with respect to the support element by the shifting element.11. The valve train device according to claim 10 , wherein the shifting element is disposed inside the switch unit.12. The valve train device according to claim 11 , wherein the shifting element axially shifts the first displacement body and the second displacement body inside the switch unit.13. The valve train device according to claim 10 , wherein the shifting element is disposed outside the switch unit.14. The valve train device according to claim 10 , wherein an entirety of the switch unit is axially adjustable with respect to the support element by the shifting element.15. A method for operating the valve train device according to . The invention relates to a valve train device and to a method for operating a valve train device.A valve train device is already known from DE 10 2015 014 175, in ...

CAMSHAFT FOR AN INTERNAL COMBUSTION ENGINE AND USE THEREFORE

A camshaft for an internal combustion engine, with a drivable basic shaft and a cam piece which is mounted in the basic shaft, wherein the basic shaft passes through a passage in the cam piece, and the cam piece is mounted in the basic shaft in a rotationally fixed and axially displaceable manner. In the case of such a camshaft, it is provided that the basic shaft has a polygonal profile, and the passage in the cam piece has a complementary polygonal profile for receiving the basic shaft. The camshaft is preferably used in a motorcycle which has an internal combustion engine with two cylinders. 1. A camshaft for an internal combustion engine , with a drivable basic shaft and a cam piece which is mounted in the basic shaft , wherein the basic shaft passes through a passage in the cam piece , and the cam piece is mounted in the basic shaft in a rotationally fixed and axially displaceable manner , wherein the basic shaft has a polygonal profile , and the passage in the cam piece has a complementary polygonal profile for receiving the basic shaft.2. The camshaft as claimed in claim 1 , wherein the polygonal profiles of basic shaft and passage have an identical shape claim 1 , wherein the cross section of the polygonal profile of the basic shaft is smaller than the cross section of the polygonal profile of the passage.3. The camshaft as claimed in claim 1 , wherein the respective polygonal profile is of substantially four-cornered claim 1 , in particular square claim 1 , design.4. The camshaft as claimed in claim 1 , wherein the respective polygonal profile has rounded corners.5. The camshaft as claimed in claim 1 , wherein the respective polygonal profile has an outwardly curved contour in a region connecting respective adjacent corners.6. The camshaft as claimed in claim 1 , wherein the basic shaft is connected in the region of one end to an externally driveable drive element.7. The camshaft as claimed in claim 1 , wherein the cam piece has a slotted guide element and ...

Method for operating a valve train of an internal combustion engine and corresponding valve train

A method and apparatus for operating a valve train of an internal combustion engine having a main camshaft for which at least one rotationally-fixed cam carrier is provided that can be shifted between two axial positions is disclosed. An actuator cooperates with at least one shift gate to axially shift the cam carrier into a target position. The actuator comprises a driver that is extended in the direction of at least one sliding slot of the shift gate to shift the cam carrier. The sliding slot has an ejection ramp in an ejection region that ejects the driver out of the sliding slot until the conclusion of the shift. A voltage induced in the actuator by the ejection is detected, the induced voltage is integrated across a rotational-angle range associated with the ejection region, and a confirmation signal is generated when the integrated voltage exceeds a threshold level.

LUBRICATING STRUCTURE OF VARIABLE VALVE TRAIN

An engine camshaft has a lubricating oil passage formed along the longitudinal axis of the same, a cam communicating oil hole is radially formed from the lubricating oil passage to an outer peripheral surface of the camshaft at the same axial position as an engine valve. Cam lubrication holes are radially formed from the inside to cam surfaces of cam lobes formed around a cam carrier fitted around the camshaft. One of the cam lubrication holes of the cam lobes shifted to a position for operating the valve communicates with the cam communicating oil hole of the camshaft to supply lubricant oil. 1. A lubricating structure of a variable valve train , comprising:a camshaft rotatably supported in a cylinder head of an internal combustion engine;a cylindrical cam carrier fitted on and around the camshaft axially slidably relative to the camshaft and co-rotatably with the camshaft, the cam carrier having therearound a plurality of cam lobes different in cam profile and axially adjacent to each other; anda cam changeover mechanism for axially shifting the cam carrier to change over the cam lobes for operating on an engine valve; wherein:the camshaft includes therein a lubricant oil passage along a longitudinal axis of the camshaft, and the camshaft includes a cam communicating oil hole radially formed from the lubricant oil passage to an outer peripheral surface of the camshaft, at an axial position corresponding to an axial position of the engine valve; andthe cam carrier includes cam lubrication holes formed radially from inside thereof to cam surfaces of the cam lobes, respectively, and the cam communicating oil hole of the camshaft is located at an axial position of the camshaft at which one of the cam lubrication holes of the cam carrier is axially located so as to communicate with the cam communicating oil hole, when the one cam lubrication hole is at an axially shifted position for operating the engine valve.2. The lubricating structure of the variable valve train ...

Valve Drive Device, in Particular for an Internal Combustion Engine of a Motor Vehicle, and Method for Operating Such a Valve Drive Device

A valve drive device has a camshaft which includes a shaft element and a cam piece which can be driven by the shaft element and a first cam effecting a first stroke of a valve and a second cam effecting a second stroke of the valve, and is displaceable in the axial direction of the camshaft relative to the shaft element between a first position, in which the valve can be actuated by the first cam, and a second position in which the valve can be actuated by the second cam, and has an electrically controllable actuator via which the cam piece is displaceable relative to the shaft element in the axial direction as a result of an electrical control of the actuator. The actuator pushes the cam piece alternately back and forth between the positions in the case of successive electrical controls occurring with the same polarity. 110.-. (canceled)1110. A valve drive device () , comprising:{'b': 12', '18', '20', '18', '24', '26', '22', '12', '18', '24', '26, 'a camshaft () which comprises a shaft element () and a cam piece () which is drivable by the shaft element () and which has a first cam () effecting a first stroke of a valve and a second cam () effecting a second stroke of the valve different from the first stroke and which is displaceable in an axial direction () of the camshaft () relative to the shaft element () between a first position, in which the valve is actuatable by the first cam (), and a second position in which the valve is actuatable by the second cam ();'}{'b': 28', '28', '20', '22', '12, 'an electrically controllable actuator () via which, as a result of an electrical control of the actuator (), the cam piece () is displaceable relative to the shaft element in the axial direction () of the camshaft ();'}{'b': 28', '20, 'wherein the actuator () is configured to push the cam piece () alternately back and forth between the first and second positions in a case of successive electrical controls with a same polarity; and'}{'b': 30', '28', '28, 'an electronic ...

VALVE TRAIN HAVING A SLIDING CAM ELEMENT

A valve drive may include a sliding cam element that is held on a carrier shaft so as to be axially displaceable along an axis of rotation of the carrier shaft. The sliding cam element may include at least one cam profile group with cam profile sections of mutually different form. The valve drive may further include a pick-off element by way of which a control movement can be picked off from the cam profile sections and transmitted to a valve. The sliding cam element may also include a second cam profile group that is similar or identical to the first cam profile group and, which for the joint control of one valve, may interact with the pick-off element. 110.-. (canceled)11. A valve drive comprising:a sliding cam element that is disposed on a carrier shaft so as to be axially displaceable along an axis of rotation of the carrier shaft, wherein the sliding cam includes a first cam profile group with cam profile sections of mutually different form and a second cam profile group with cam profile sections of mutually different form, wherein the cam profile sections of the first cam profile group are the same as the cam profile sections of the second cam profile group; anda pick-off element by way of which a control movement is picked off from the cam profile sections and transmitted to a valve, wherein the two cam profile groups interact with the pick-off element to jointly control the valve.12. The valve drive of wherein the first and second cam profile groups are adjacent and adjoin one another on the sliding cam element.13. The valve drive of wherein a first roller of the pick-off element interacts with the cam profile sections of the first cam profile group and a second roller of the pick-off element interacts with the cam profile sections of the second cam profile group.14. The valve drive of wherein the first and second rollers are disposed along a common roller axis.15. The valve drive of wherein a diameter of the first roller is equal to a diameter of the second ...

Valve Drive Device, in Particular for an Internal Combustion Engine

A valve train device, in particular for an internal combustion engine, includes at least one camshaft which has at least one cam element with at least one multi-track cam. The cam element is provided to be axially displaced by a maximum displacement path. The valve train device further includes a limiting mechanism which is provided to limit in at least one operating state the displacement path of the cam element to a switching path of the switching operation. 111.-. (canceled)12. A valve drive device , comprising:a camshaft having a cam element with a multi-track cam that is axially displaceable by a maximum displacement path; anda limiting mechanism, wherein, in at least one operating condition, a displacement path of the cam element is limited to a switching path for a switching operation.13. The valve drive device according to further comprising a positive-locking element which is connected to the cam element and provides for a positive-locking connection to the limiting mechanism.14. The valve drive device according to claim 13 , wherein the limiting mechanism includes a stop element with two opposite stop surfaces for the positive-locking element.15. The valve drive device according to claim 14 , wherein the stop surfaces have a distance from one another which limits a displacement of the cam element to a value of a distance between adjacent cam tracks of the multi-track cam.16. The valve drive device according to claim 14 , wherein the limiting mechanism includes an auxiliary actuator and wherein the stop element is displaceable by the auxiliary actuator.17. The valve drive device according to further comprising a switching actuator for axially displacing the cam element claim 12 , wherein the switching actuator includes a switching element which is in permanent operative connection with the cam element and includes a drive for axial displacement of the switching element claim 12 , wherein the drive is decoupleable from the switching element.18. The valve ...

Camshaft assembly for an internal combustion engine

A camshaft assembly for an internal combustion engine includes a camshaft, a first lobe set, and a second lobe set, extending along, and rotatable about, a cam axis. The first lobe set includes a first, second, and third lobe. The second lobe set includes a first and second lobe. The first lobe set is movable along the cam axis between a first, second, and third position. The second lobe set is movable along the cam axis between a first and second position. The first and second position of each of the first and second lobe sets corresponds to lift of a respective valve stem in the engine. The third position of the first lobe set corresponds to zero lift of the respective valve stem to provide cylinder deactivation of a corresponding cylinder within the engine.

Method and device for operating a drive unit, drive unit, motor vehicle

A method for operating a drive apparatus, having a reciprocating-piston engine and an exhaust-gas-driven turbocharger, of a motor vehicle, the reciprocating-piston engine being operated in a four-stroke mode during on-load operation; and the exhaust-gas-driven turbocharger having an electrical machine, in particular a media gap machine, that is operated in generator mode during overrun operation of the reciprocating-piston engine. During overrun operation, the reciprocating-piston engine is operated in a two-stroke mode.

MULTIPLE VARIABLE VALVE LIFT APPARATUS

A multiple variable valve lift apparatus may include a moving cam formed in a hollow cylindrical shape into which a camshaft is inserted. In particular, the moving cam rotates together with the camshaft, moves in an axial direction of the camshaft, and includes a cam guide protrusion and a plurality of cams realizing different valve lift with each other. Moreover, the apparatus includes: an operating unit selectively guiding the cam guide protrusion; a controller controlling the operating unit; a valve opening/closing unit contacting with any one cam of the cams; and at least two pins disposed at the operating unit so as to guide the cam guide protrusion. The cam guide protrusion includes an inserted portion being selectively inserted between the pins and a shift portion. 1. A multiple variable valve lift apparatus comprising: 'wherein the moving cam comprises a cam guide protrusion and a plurality of cams configured to perform a different valve lift with each other;', 'a moving cam formed in a hollow cylindrical shape in which a camshaft inserted into the moving cam, the moving cam configured to rotate together with the camshaft and to move in an axial direction of the camshaft,'}an operating unit configured to selectively guide the cam guide protrusion so as to move the moving cam in the axial direction;a controller configured to control the operating unit;a valve opening/closing unit configured to contact with any one cam of the plurality of cams so as to open or close a valve; andat least two pins disposed at the operating unit so as to guide the cam guide protrusion,wherein an inserted portion being selectively inserted between one of said at least two pins and a shift portion formed so as to be guided between said at least two pins of the operating unit is formed at the cam guide protrusion, andthe inserted portion is formed to be thinner than the shift portion.2. The apparatus of claim 1 , wherein the shift portion is formed to be gradually thick from the ...

Valve device for internal combustion engine

A first swing arm of each cylinder is swung by a fixed cam of an intake camshaft, so as to operate a first intake valve according to a profile thereof. A second swing arm is swung by a second cam and its swing range is changed by a variable mechanism. Hereby, a lift amount of a second intake valve changes continuously. The second cam is selected from a plurality of cams on a cam piece provided around the intake camshaft.

Valve Drive for an Internal Combustion Engine

A valve drive for an internal combustion engine has a first camshaft which is rotatably mounted in a first and a second camshaft bearing and which includes at least one cam with a first cam curve and a second cam curve that differs from the first cam curve, wherein a gas exchange valve can be actuated by the first or the second cam curve. A camshaft section is provided, by which the cam can be moved by an actuator such that the gas exchange valve can be actuated either via the first or the second cam curve. The first camshaft and the cam have a fixed position relative to each other. The first camshaft can be axially moved in the first and the second camshaft bearing. 1. A valve drive for a cylinder head of an internal combustion engine , comprising:a first camshaft mounted rotatably in a first and a second camshaft bearing, whereinthe first cam shaft has at least one cam with a first cam lobe and a second cam lobe which is different than the first cam lobe, a gas exchange valve being actuatable by way of the first or the second cam lobe,the first camshaft has a camshaft section by way of which the cam is displaceable via an actuator such that the gas exchange valve is actuatable via either the first or the second cam lobe,the first camshaft and the cam have a fixed position with respect to one another, andthe first camshaft is displaceable axially in the first and the second camshaft bearing.2. The valve drive according to claim 1 , whereinthe cam and the camshaft are in one piece and are made from the same material.3. The valve drive according to claim 1 , whereinthe cam is joined or shrunk-fit onto the camshaft.4. The valve drive according to claim 1 , whereinthe camshaft is hollow.5. The valve drive according to claim 1 , further comprising:a second camshaft mounted rotatably in a third and a fourth camshaft bearing and arranged in parallel with respect to the first camshaft;a first spur gearwheel arranged radially around the first camshaft;a second spur ...

ASSEMBLED CAMSHAFT AND METHOD FOR PRODUCING AN ASSEMBLED CAMSHAFT

A camshaft for an engine and a method of assembling such a camshaft, wherein the camshaft has a base shaft and an external toothing which extends at least in certain portions axially along the base shaft A hub has an internal toothing which correlates with the external toothing of the base shaft such that the hub is connected rotationally conjointly and axially non-displaceably to the base shaft. The external toothing has at least one form-fit subregion, which extends axially at least in certain portions along the base shaft, or one force-fit subregion in order for the hub to be arranged at least in a form-fitting or force-fitting manner, and wherein at least the form-fit subregion or the force-fit subregion is adjoined by at least one alignment region which extends at least in certain portions axially along the base shaft and which serves for the angular alignment of the hub. 114.-. (canceled)15. An assembled camshaft for an internal combustion engine , wherein the camshaft comprises:a base shaft and an external toothing which extends axially along at least portions of the base shaft; anda hub with an internal toothing which fits with the external toothing of the base shaft such that the hub is connected rotationally conjointly and axially non-displaceably to the base shaft;wherein the external toothing has at least one form-fit subregion, which extends axially along at least a portion of the base shaft, or one force-fit subregion configured to arrange the hub at least in a form-fitting or force-fitting manner;and wherein at least the form-fit subregion or the force-fit subregion is adjoined by at least one alignment region which extends axially along at least a portion of the base shaft and which serves for the angular alignment of the hub;wherein the external toothing at least of the one form-fit subregion or of the force-fit subregion comprises at least two tooth spaces which are formed between the teeth and which have mutually different root circle diameters; ...

Exhaust Valve Deactivation

A valve control of an internal combustion engine has a camshaft and a cam sleeve, which surrounds the camshaft and is fastened in an axially movable manner and has cams, which are associated with individual valves and extend in the radial direction. The cam sleeve can be moved in the axial direction in relation to the camshaft by an actuator during rotation. The cam sleeve has at least two axial segments, which can be moved in relation to each other in the axial direction by the actuator, which engages in the axial segments.

SLIDING CAM SYSTEM HAVING TWO-STAGE ACTUATOR STROKE

A sliding cam system is provided including: at least one sliding cam arranged in a fixed, but axially slideable manner on at least one axially fixed base shaft for forming a cam shaft of a reciprocating internal combustion engine; at least one actuator device for adjusting the sliding cam into different axial positions using at least one actuator pin that can engage in at least one sliding groove on a circumference of the sliding cam, wherein the actuator device has a housing attached to the engine and the sliding grooves are arranged in a groove section of the sliding cam; and a bracket encompassing the groove section using side shoulders, directed parallel to a longitudinal axis of the base shaft and provided with an opening in a region of the actuator pins, wherein the sliding cam has at least two sliding grooves having at least partially different depths, wherein the bracket is directed in the actuator device and wherein a positive-fit depth stop device is provided between the bracket and the actuator pin(s). 1. A sliding cam system comprising at least one sliding cam that is arranged rotationally locked but movable in an axial direction on at least one axially fixed base shaft for forming a camshaft of a reciprocating piston internal combustion engine , at least one actuator device for adjusting the sliding cam into different axial positions by at least one actuator pin that engages in at least one sliding groove on a periphery of the sliding cam , the actuator device has a machine-fixed housing , the sliding grooves are arranged in a groove section of the sliding cam , a bracket surrounds the groove section by side shoulders thereof and is guided parallel to a longitudinal axis of the base shaft and is provided with an opening in an area of the actuator pins , the sliding cam has at least two of the sliding grooves that have at least partially different depths , the bracket is guided in the actuator device , and a positive-fit depth stop device is provided ...

A VALVE DRIVE

A valve drive comprising a camshaft with base shaft, a lobe pack mounted on the base shaft and comprising three cam lobes. Two actuator bodies are associated with two actuator pins each connected to a valve of a cylinder of the engine. The lobe pack is axially displaceable along the base shaft so as to for each actuator body change cam lobe aligned therewith. A middle cam lobe has a shape leaving an actuator body aligned therewith uninfluenced thereby. In a first position of the lobe pack a first of the actuator bodies is aligned with and hit and moved by a first cam lobe and the other, second actuator body is aligned with the middle cam lobe, and in a second position the second actuator body is aligned with and hit and moved by a third cam lobe and the first actuator body is aligned with the middle cam lobe. 1. A valve drive for use in an internal combustion engine comprising: a base shaft configured to rotate about a longitudinal axis; and', 'a lobe pack mounted on the base shaft and comprising at least two differently shaped cam lobes;, 'a camshaft comprisingtwo actuator bodies associated with two actuator pins, in which each pin is connected to a valve of a cylinder of the engine and each actuator body is configured to be moved when hit by a said cam lobe aligned therewith and by that lift at least one said valve between a closed and open positions; andan arrangement controllable to displace the lobe pack axially along the base shaft so as to for each actuator body change cam lobe aligned therewith,wherein the lobe pack comprises three cam lobes of which a second, middle cam lobe has a shape leaving an actuator body aligned therewith uninfluenced thereby by rotation of the camshaft, and that this middle cam lobe is in common to both actuator bodies, andwherein the arrangement is configured to displace the lobe pack between a first position, in which a first of said actuator bodies is aligned with and hit and moved by a first said cam lobe by rotation of the ...

Multistage variable valve lift apparatus, system and engine

A multistage variable valve lift apparatus includes: a camshaft; a plurality of cams slidably provided on the camshaft and each including a cam base with a guide projection and a cam lobe; a solenoid unit that includes an operating rod with a guide slot into which the guide projection is selectively inserted; and a valve opening/closing portion that comes into selective contact any one of the plurality of cams.

Variable valve mechanism for engine

For example, two intake valves for each cylinder each are driven by a selected one of cams via a corresponding rocker arm. Each rocker arm includes a support portion and a pressing portion (distal end portion). The support portion is rockably supported by a cylinder head. The pressing portion is configured to press a stem of the corresponding intake valve. The support portion of one of the rocker arms deviates to one side in an axis X direction (cam axial direction) with respect to the distal end portion. The support portion of the other one of the rocker arms deviates to the other side in the axis X direction with respect to the distal end portion.

VARIABLE VALVE DEVICE FOR ENGINE

A variable valve device for an engine, may include a camshaft; a movable cam device fitted over the camshaft to be slidable in an axial direction of the camshaft, and configured such that cams with at least two different cam profiles and a guide protruding portion are disposed along the axial direction of the camshaft; at least one shaft groove linearly processed to have a predetermined cross-sectional shape in an external circumferential surface of the camshaft along the axial direction thereof; a cam groove provided in an internal circumferential surface of the movable cam device to communicate with the shaft groove; and an insertion member inserted into a communication space defined by the shaft groove and the cam groove such that a rotational displacement of the camshaft is transmitted to the movable cam device. 1. A variable valve device for an engine , the variable valve device comprising:a camshaft;a movable cam device including a movable camshaft fitted over the camshaft to be slidable in an axial direction of the camshaft, wherein cams with at least two different cam profiles and a guide protruding portion are disposed on the movable camshaft along the axial direction of the camshaft;at least one shaft groove linearly processed on the camshaft to have a predetermined cross-sectional shape in an external circumferential surface of the camshaft along the axial direction of the camshaft;at least one cam groove provided in an internal circumferential surface of the movable cam device to communicate with the at least one shaft groove; andan insertion member inserted into a communication space defined between the at least one shaft groove and the at least one cam groove, wherein a rotational displacement of the camshaft is transmitted to the movable cam device by the insertion member.2. The variable valve device of claim 1 ,wherein each of the at least one shaft groove and the at least one cam groove has a semicircular cross section, and the communication space ...

Valve operating system for engine

A valve operating system for an engine is provided. The system includes first and second detent mechanisms for holding a cam element at a first position when the cam element is shifted to one side in camshaft directions, and at a second position when the cam element is shifted to the other side. The detent mechanisms include first and second detent cams and first and second pushing members, respectively. The first detent cam includes first and second grooves and a first top portion. The second detent cam includes third and fourth grooves and a second top portion. The first and second grooves have inclining portions extending from the first top portion toward bottoms thereof, inclining with respect to the camshaft directions, respectively. The third and fourth grooves have inclining portions extending from the second top portion toward bottoms thereof, inclining with respect to the camshaft directions, respectively.

INTERNAL COMBUSTION ENGINE CONTROL SYSTEM

When a stop request to the engine is issued, it is determined whether or not all of the drive cams are large cams. When it is determined that at least one of the small cams is included in the drive cams, the engine is continued to drive for a while and a switch control for switching the drive cams from the small cams to the large cams is executed within the duration. A self-holding type solenoid is used to switch between the small cams and the large cams. In the switch control, a permission to stop the engine is output at a timing when the “pin protrudable section” of the final cylinder # has elapsed. 1. An internal combustion engine system comprising:an internal combustion engine having multiple cylinders;an intake valve which is provided in each of the cylinders;two types of intake cams whose cam profile are different from each other, and are configured so that either one of the intake cam is selected for driving the intake valve;multiple cam carriers which are provided on a camshaft of the internal combustion engine and carries the intake cams in units of cylinders or cylinder groups;multiple actuators which are provided corresponding to the cam carries and are configured to slide the cam carries in the axial direction of the camshaft sequentially in accordance with protrusion operation of pins, wherein the pins are configured to engage with the corresponding cam carriers and also to switch drive cams for driving the intake valve actually between the intake cams; anda control device which is configured to:output a switch request of the drive cams to the actuators when a stop request to the internal combustion engine is issued and also it is determined that the drive cams include a different profile from a predetermined profile; andoutput a stop request to the internal combustion engine at a predetermined timing after the start of the protrusion operation of a final pin which engages with a final cam carrier and also before the start of the slide of the final cam ...

VARIABLE LIFT VALVE TRAIN OF AN INTERNAL COMBUSTION ENGINE

A method for operating an internal combustion engine with a sliding cam valve train that has a cam part () with three adjacent cams of different lifts (H, M, L) and a groove-shaped connecting link path with two path sections (S S) that lift in both axial directions of the cam part and are arranged completely one behind the other around the circumference is provided. An actuator () selectively couples two actuator pins () in the connecting link path, in order to move the cam part. The base position of the cam part should be moved into a desired axial position during the operation of the internal combustion engine through successive coupling of the actuator pins in the connecting link path. 1. A method for operating an internal combustion engine with a lift-variable gas-exchange valve train comprising an actuator and a camshaft with a carrier shaft and a cam part that is rotationally locked on the carrier shaft and is movable between three axial positions and has a group of three adjacent cams of different lifts and a groove-shaped connecting link path with first and second path sections that lift in both axial directions of the cam part and are arranged completely one behind the other over a circumference of the cam part , the actuator being actuatable to selectively extend two actuator pins that are couplable into the connecting link path , in order to move the cam piece to one of the axial positions , and a base position of the cam part is moved into a desired axial position during operation of the internal combustion engine by the following control of the actuator:a) extending a first one of the actuator pins at a circumferential path position that lies in front of the first path section and behind the second path section,b) holding the first actuator pin in an extended position within a circumferential path angle that encloses the two path sections at least once,c) retracting the first actuator pin from a circumferential path position that lies behind the second ...

SLIDING MODULE OF A CAMSHAFT

A sliding module having a sliding sleeve and at least one cam segment having at least one cam. The sliding sleeve has a positioning section for positioning the cam segment fixedly against rotation and displacement. The positioning section includes a surface structure on the outer circumferential face of the sliding sleeve for producing a press-fit connection between the cam segment and the sliding sleeve. A stop region is provided configured to limit an axial movement of the cam segment. 110.-. (canceled)11. A sliding module , comprising:a sliding sleeve; andat least one cam segment having at least one cam; a surface structure on the outer circumferential face of the sliding sleeve configured to produce a press-fit connection between the cam segment and the sliding sleeve; and', 'a stop region for limiting an axial movement of the cam segment., 'wherein the sliding sleeve has a positioning section configured to position the cam segment fixedly against rotation and displacement, the positioning section comprising12. The sliding module as claimed in claim 11 , wherein the stop region is a constituent part of the surface structure.13. The sliding module of claim 11 , wherein the surface structure is a material accumulation.14. The sliding module of claim 13 , wherein the surface structure is a roll-formed portion.15. The sliding module of claim 11 , wherein the stop region is a projection which extends in the radial direction away from the outer circumferential face.16. The sliding module of claim 11 , wherein the stop region protrudes beyond the surface structure in the radial direction.17. The sliding module of claim 11 , wherein the stop region is configured at a distal end of the sliding sleeve.18. The sliding module of claim 11 , wherein the stop region is configured at an end of the positioning section.19. The sliding module of claim 11 , wherein the cam segment has a through bore with at least one insertion bevel which is disposed at a distal end thereof.20. The ...

Valvetrain configurations for multilevel dynamic skip fire variable valve lift switching and cylinder deactivation

The invention relates generally valve train systems for internal combustion engine. More particularly, valve train configurations enable operation of a cylinder with two distinct, non-zero lift profiles and cylinder deactivation.

INTERNAL COMBUSTION ENGINE SYSTEM

In a system that selects a large-cam as a driving cam at a time of a start of an engine, when an engine stop request is output, it is determined whether there is a small-cam cylinder for which a small-cam is selected as the driving cam. In a case where it is determined that there is a small-cam cylinder, a switching command for switching the driving cam from the small-cam to the large-cam is output. When an engine start request is output, the above determination is performed again. In a case where it is determined that there is a small-cam cylinder, the switching command is output to all solenoid actuators again. In addition, the drive of the fuel injector is suspended until the switching operation of the driving cam is completed for all cylinders. 1. An internal combustion engine system comprising:an internal combustion engine that includes a plurality of cylinders;a plurality of kinds of cams that have different cam profiles, each of the plurality of kinds of cams being configured to be capable of driving an intake valve that is provided for each of the cylinders of the internal combustion engine;a plurality of cam carriers, each of the plurality of cam carriers being configured to support the plurality of kinds of cams provided for a corresponding one of the cylinders or to support the plurality of kinds of cams provided for a corresponding one of cylinder groups, the plurality of cam carriers being provided on a camshaft which rotates in synchronization with a crankshaft of the internal combustion engine;a plurality of switching mechanisms, each of the plurality of switching mechanisms being respectively provided for a corresponding one of the cam carriers, the plurality of switching mechanisms switching driving cams among the plurality of kinds of cams, each of the driving cams being a cam that actually drives the intake valve; anda controller, the controller being configured to:i) output a switching command, for performing switching of the driving cam of each ...

Engine Braking Method and System

An engine braking method includes the steps of engaging a cam roller( 235 ) of an internal combustion engine with an engine power cam( 230 ) for an engine power operation; disengaging the cam roller( 235 ) from the engine power cam( 230 ); losing a motion from the engine power cam( 230 ) and a motion of an engine valve( 301 ) associated with the motion from the engine power cam( 230 ); engaging the cam roller( 235 ) with an engine braking cam( 2302 ) for an engine braking operation; transmitting a motion from the engine braking cam( 2302 ) to the engine valve( 301 ); and generating an engine valve motion for the engine braking operation. An engine braking system includes an engine power cam( 230 ) of an internal combustion engine; an engine braking cam( 2302 ) of the internal combustion engine; and a cam roller( 235 ) that is designed to engage with the engine power cam( 230 ) for an engine power operation and to engage with the engine braking cam( 2302 ) for an engine braking operation.

SLIDING CAMSHAFT ASSEMBLY

A camshaft assembly includes an actuator and an axially moveable structure mounted to a base shaft wherein the axially moveable structure includes a plurality of lobe packs and a cam barrel. The axially movable structure moves along the base shaft in the axial direction along a longitudinal axis of the base shaft, but is rotationally fixed to the base shaft. The barrel cam includes an inner wall and an outer wall which defines a control groove therebetween. The control groove further defines first and second regions wherein the first region includes a fixed narrow control groove width and the second region includes a progressively decreasing control groove width. The actuator shifts the axially moveable structure relative to the base shaft between a first position and a second position. A recess is defined in the outer wall such that the recess is disposed adjacent to the first region. 1. A camshaft assembly comprising:a base shaft extending along a longitudinal axis; 'a plurality of lobe packs, each of the plurality of lobe packs including a plurality of', 'an axially movable structure mounted on the base shaft and being axially movable relative to the base shaft between a first position and a second position via an actuator while also being rotationally fixed to the base shaft, the axially movable structure includes a barrel cam having a control groove defined between an inner wall and an outer wall of the barrel cam such that the control groove further includes a first region having a fixed narrow groove width between the inner and outer walls and a second region having an enlarged groove width between the inner wall and the outer walls; and', 'a recess is defined in the outer wall of the barrel cam such that the recess is disposed adjacent to the first region;', 'wherein the recess is defined in the first region of the barrel cam, and', 'wherein the fixed narrow groove and the enlarged groove are aligned circumferentially around the longitudinal axis at an axial ...

Shifting camshaft groove design for load reduction

A camshaft assembly includes a base shaft including at least one lobe pack axially movably mounted on the base shaft, the lobe pack including a control groove therein. An actuator device includes a pin movably mounted to the actuator between a retracted position and an extended position for engaging with the control groove to cause axial movement of the lobe pack. The control groove includes a pin engagement region, a shifting region and an ejection region. The pin engagement region of the control groove has a first pair of sidewalls. The shifting region extends from the pin engagement region and has a second pair of sidewalls angled relative to the first pair of sidewalls and having a first portion with a varying groove width that varies relative to a groove width of the pin engagement region.

INTERNAL COMBUSTION ENGINE SYSTEM

An internal combustion engine system is provided with a cam switching device including a cam groove provided on the outer peripheral surface or a camshaft and an actuator capable of protruding, toward the camshaft, an engagement pin that is engageable with the cam groove. The internal combustion engine system is configured, in causing the cam switching device to perform a cam switching operation, to control the actuator such that the engagement pin is seated on a forward outer peripheral surface which is located more forward than an end of the cam groove on the forward side with respect to an insert section of the cam groove in the rotational direction of the camshaft. 1. An internal combustion engine system , comprising:a camshaft which is driven to rotate;a plurality of cams which are provided at the camshaft and whose profiles are different from each other;a cam switching device configured to perform a cam switching operation that switches, between the plurality of cams, a cam that drives a valve that opens and closes a combustion chamber; anda control device configured to control the cam switching device,wherein the cam switching device includes:a cam groove which is provided on an outer peripheral surface of the camshaft; andan actuator which is equipped with an engagement pin engageable with the cam groove, and which is capable of protruding the engagement pin toward the camshaft,wherein the cam switching device is configured such that, while the engagement pin is engaged with the cam groove, the cam that drives the valve is switched between the plurality of cams in association with a rotation of the camshaft,wherein the outer peripheral surface of the camshaft includes a forward outer peripheral surface which is located more forward than an end of the cam groove on a forward side in a rotational direction of the camshaft, andwherein the control device is configured, in causing the cam switching device to perform the cam switching operation, to control the ...

VARIABLE VALVE CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINES

The invention relates to a variable valve control device () for internal combustion engines of the reciprocating-piston design having at least one gas exchange valve (), which can be actuated by a camshaft () by means of a cam device () that is connected to the camshaft () for conjoint rotation and that has at least two different cam tracks (), which camshaft is supported in such a way that the camshaft can be rotated about a camshaft axis (), wherein, selectively, one of the cam tracks () can be activated and at least one other cam track () can be deactivated by means of a control device (), and wherein the control device () has at least one control lever (), which can be pivoted about a pivot axis (), and has at least one first control body (), which is connected to the camshaft () for conjoint rotation and in the surface of which at least one first control groove () and at least one second control groove () are formed, wherein, selectively, a first control stud () of the control lever () can be directed into the first control groove () or a second control stud () of the control lever () can be directed into the second control groove (). In order to enable a compact variable valve control system having little production and construction complexity, the control body () has an inner first lateral surface () and an outer second lateral surface (), wherein the first lateral surface () has a smaller distance from the camshaft axis () than the second lateral surface () has and the two lateral surfaces () are arranged concentric to the camshaft axis (), and wherein the two lateral surfaces () facing each other bound a substantially annular control space (), and the first control groove () is formed in the first lateral surface () and the second control groove () is formed in the second lateral surface (). 11323243787887101012111331718191217201218131415142151415214151617141815. A variable valve control device () for internal combustion engines of the reciprocating piston ...

SLIDING CAM SYSTEM HAVING AN EXTENDED ENGAGEMENT REGION

A sliding cam system, having at least one sliding cam, which is arranged in a rotationally fixed but axially displaceable manner on at least one axially fixed base shaft of a reciprocating-piston internal combustion engine in order to form a camshaft, at least one actuating device for moving the sliding cam into different axial positions by at least one actuating pin that can reach into at least one displacement groove on the periphery of the sliding cam. The actuating device has a machine-fixed housing and the displacement groove is formed in a top circle surface of the sliding cam down to a groove base and is helical and has an insertion region, a displacement region having an accelerating flank and a braking flank, and a retraction region for the actuating pin. An extended engagement region is associated with the displacement groove and the extended engagement region at least partially has a material removal from the level of the top circle surface in the direction of the groove base. 1. A sliding cam system of a reciprocating-piston internal combustion engine , comprising a camshaft having at least one sliding cam , which is arranged in a manner which prevents relative rotation but allows axial shifting on at least one axially fixed base shaft in order to form the camshaft , at least one actuating device for adjusting the sliding cam into different axial positions , the at least one actuating device having at least one actuating pin that is made to engage in at least one shifting groove on a periphery of the sliding cam , the actuating device has a housing fixed to the engine and the shifting groove is machined into a top circle surface of the sliding cam down to a groove bottom and is of helical design and has an entry region , a shifting region having an accelerating flank and a braking flank , and an exit region for the actuating pin , the shifting groove has an extended engagement region and the extended engagement region at least partially has a material ...

CAM PHASER BETWEEN CAM BEARINGS

A variable camshaft timing assembly that comprises a hub including at least one vane extending radially-outwardly away from a center axis; an elongated camshaft sleeve, configured to be received at least partially by an inner cavity of a camshaft, having a substantially annular outer surface including a distal bearing section, an end bearing section, and a hub section: the distal bearing section configured to be positioned radially-inwardly from and concentric with a distal bearing of the camshaft and to provide support to the distal bearing; the end bearing section, axially spaced from the distal bearing section, configured to be positioned radially-inwardly from and concentric with an end bearing of the camshaft and to provide support to the end bearing; and the hub section, configured to engage the hub, located axially between the distal bearing section and the end bearing section. 1. A variable camshaft timing assembly comprising:a hub including one or more vanes extending radially-outwardly away from a center axis; the distal bearing section configured to be positioned radially-inwardly from and concentric with a distal bearing of the camshaft and to provide support to the distal bearing;', 'the end bearing section, axially spaced from the distal bearing section, configured to be positioned radially-inwardly from and concentric with an end bearing of the camshaft and to provide support to the end bearing; and', 'the hub section, configured to engage the hub, located axially between the distal bearing section and the end bearing section., 'an elongated camshaft sleeve, configured to be received at least partially by an inner cavity of a camshaft, having a substantially annular outer surface including a distal bearing section, an end bearing section, and a hub section2. The variable camshaft timing assembly recited in claim 1 , further comprising a camshaft including an inner cavity that receives the elongated camshaft sleeve.3. The variable camshaft timing ...

INTERNAL COMBUSTION ENGINE SYSTEM

At crank angle CA at which the switch request of the drive cam was issued, the ejection operations of the pins at all the solenoid actuators started simultaneously. The ejected pins are seated on the cam carriers at erank angle CA The pin seated on the cam carrier moves along the grooves in accordance with the rotation of the cam carrier. The earliest finish timing of the switch operation of the drive cam is at crank angle CA (#4 cylinder). At the crank angle CA drive of the fuel injector and the ignition device in each cylinder is permitted. 1. An internal combustion engine system comprising:an internal combustion engine comprising multiple cylinder;multiple types of cams which have different cam profiles per cylinder and are configured to drive intake valves which are provided in each cylinder;cam carriers which are provided on a cam shaft which rotates synchronously with a crank shaft of the internal combustion engine, each of the cam carriers supports the multiple types of cams per cylinder or cylinder groups, wherein a spiral-shaped groove is formed on an outer periphery of each of the cam carriers, the spiral-shaped groove comprises an inclined part which inclines with respect to the cam shaft, a front orthogonal part which is orthogonal to the cam shaft and communicates with the inclined part on a front side in the rotation direction of the cam shaft and a rear orthogonal part which is orthogonal to the cam shaft and communicates with the inclined part on a rear side in the rotation direction of the cam shaft;multiple switching mechanisms which are provided corresponding to the cam carriers and are configured to:slide the cam carriers sequentially in the axial direction of the cam shaft in accordance with ejection operations of pins which are configured to engage with the spiral-shaped groove; andswitch drive cams that actually drive the intake valves among the multiple types of the cams; anda control device,wherein the control device is configured to:when ...

CAM JOURNAL LUBRICANT SUPPLY MECHANISM FOR ENGINE

An oil supply path passes through members separate from a cylinder head () to supply a lubricant to bearings () of camshaft journals. The oil supply path includes an oil supply passage () for the camshaft above the camshaft (), a connection passage () for the camshaft between the oil supply passage for the camshaft and an internal passage () in the cylinder head (), and branch oil passages () for the camshaft journals. Each branch oil passage branches off from the oil supply passage for the camshaft, and is connected to one of the bearings () from above. Each of the branch passages includes a throttle () with a smaller cross-sectional flow area than the oil supply passage for the camshaft. 1. A lubricant supply mechanism for camshaft journals of an engine including a camshaft , provided in a cylinder head and including the camshaft journals , and bearings , each rotatably supporting one of the camshaft journals of the camshaft , the mechanism comprising:an oil supply path passing through members separate from and attached to the cylinder head to supply a lubricant discharged from an oil pump in the engine to the bearings, wherein an oil supply passage for the camshaft located above the camshaft and extending along an axis of the camshaft,', 'a connection passage for the camshaft located between the oil supply passage for the camshaft and an internal passage in the cylinder head, and supplying the lubricant having passed through the internal passage to the oil supply passage for the camshaft, and', 'branch oil passages for the camshaft journals, each branching off from the oil supply passage for the camshaft, connected to one of the bearings from above, and supplying the lubricant to one of the bearings,, 'the oil supply path includes'}each of the branch passages includes a throttle with a smaller cross-sectional flow area than the oil supply passage for the camshaft.2. The lubricant supply mechanism of claim 1 , whereina cam piece is provided at at least one of two ...

VARIABLE STROKE GAS EXCHANGE VALVE TRAIN OF AN INTERNAL COMBUSTION ENGINE

The disclosure relates to a valve train of an internal combustion engine having variable-lift gas exchange valves, comprising: a carrier shaft, a cam piece arranged on the carrier shaft in a rotationally fixed and axially displaceable manner. The cam piece comprises a cam group of axially adjacent cams of different elevations, and an axial slotted link having axially opposite displacement grooves, each having a displacement region and an outlet region. Actuator pins, by engaging with the displacement grooves, displace the cam piece on the carrier shaft. Each displacement groove axially delimits, partially or completely, the outlet region by only one groove wall, and the one groove wall, at which the actuator pin, which is in engagement with the displacement region, positively accelerates the cam piece into a displacement direction. The width of the displacement grooves is smaller in the outlet region than a diameter of the actuator pins. 1. A valve timing gear of an internal combustion engine having variable-lift gas exchange valves , the valve timing gear comprising:a carrier shaft,an axially displaceable cam piece arranged and rotationally fixed on the carrier shaft, the axially displaceable cam piece having at least one cam group of axially adjacent cams of different lobe lifts and an axial link having axially opposed displacement grooves, each displacement groove having a displacement area and an outlet area successively in a direction of rotation of the cam piece, andcylindrical actuator pins, which, in engagement with the displacement grooves, displace the cam piece on the carrier shaft, andeach displacement groove axially defines at least part of the outlet area by way of only one groove wall, that on which the actuator pin in engagement with the displacement area positively accelerates the cam piece into a displacement direction, and a width of the displacement grooves in their respective outlet areas is smaller than a diameter of the actuator pins.2. The ...

CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

A control device is configured, if, although the control device has caused a cam switching device to perform a first cam switching operation for switching the profiles of all the valve-driving cams of a plurality of cylinders from a first profile to a second profile, the profiles of all the valve-driving cams of the plurality of cylinders do not coincide with the second profile, to cause the cam switching device to perform a second cam switching operation for switching the profile of the valve-driving cam for at least one or more normal cylinders that are one or more cylinders at which the switching of profiles to the second profile has succeeded. 1. A control device for an internal combustion engine , the internal combustion engine including:a plurality of cylinders;a plurality of cams which are arranged for each of the plurality of cylinders, and profiles of which are different from each other; anda cam switching device configured to switch, between the profiles of the plurality of cams, a profile of a valve-driving cam that is a cam that drives a valve that opens and closes a combustion chamber in each of the plurality of cylinders on a cylinder basis or a cylinder group basis,wherein, if, although the control device has caused the cam switching device to perform a first cam switching operation for switching the profile of the valve-driving cam of each of the plurality of cylinders from a first profile to a second profile, the profiles of all the valve-driving cams of the plurality of cylinders do not coincide with the second profile, the control device is configured to cause the cam switching device to perform a second cam switching operation for switching the profile of the valve-driving cam for at least one or more normal cylinders that are one or more cylinders at which the switching of the profiles to the second profile has succeeded.2. The control device according to claim 1 ,wherein, if, although the control device has caused the cam switching device to ...

METHOD FOR RETRACTING A PARTIALLY EXTENDED SLIDING CAMSHAFT ACTUATOR PIN

A method for retracting a partially extended pin of a sliding camshaft actuator having first and second pins being selectively actuatable by adjacent first and second magnetic field generating coils includes determining if the first or the second pin is partially extended after engine ignition. A partially extended first pin is retracted with flux linkage created by the second magnetic field generating coil being coupled unto the first magnetic field generating coil, and a partially extended second pin is retracted with flux linkage created by the first magnetic field generating coil being coupled unto the second magnetic field generating coil. 1. A method for retracting a partially extended pin of a sliding camshaft actuator having first and second pins being selectively actuatable by adjacent first and second magnetic field generating coils comprising:determining if the first or the second pin is partially extended after engine ignition;energizing the first magnetic field generating coil of the sliding camshaft actuator when the second pin is partially extended;retracting the partially extended second pin with flux linkage created by the first magnetic field generating coil being coupled unto the second magnetic field generating coil and the second pin;energizing the second magnetic field generating coil of the sliding camshaft actuator when the first pin is partially extended; andretracting the partially extended first pin with flux linkage created by the second magnetic field generating coil being coupled unto the first magnetic field generating coil and the first pin.2. The method of further comprises detecting a position of a three step intake sliding camshaft.3. The method of wherein the three step intake sliding camshaft comprises at least one position indicator barrel.4. The method of wherein the three step intake sliding camshaft further comprises high lift lobe claim 3 , low lift lobe claim 3 , and deactivate lobe positions.5. The method of wherein ...

SHIFTING ELEMENT FOR SHIFTING A CAM SEGMENT

A shifting element and a shifting system may be employed to shift a cam segment along a shaft longitudinal axis of a shaft segment of a cam shaft that actuates valves of an internal combustion engine. The shifting element may have a guide groove for guiding an engagement element. The guide groove may extend along an outer peripheral surface of the shifting element at least in part. The guide groove may have an effective section for causing a rotational movement of the engagement element about a rotational axis of the engagement element. The rotational axis of the engagement element may extend orthogonally to a rotational axis of the shifting element. Further, the effective section may include a contact element for eccentrically contacting the engagement element. 110.-. (canceled)11. A shifting element for shifting a cam segment along a shaft longitudinal axis of a shaft segment of a cam shaft , the shifting element comprising a guide groove for guiding an engagement element , the guide groove extending along an outer peripheral surface of the shifting element at least in part , wherein the guide groove has an effective section for causing a rotational movement of the engagement element about a rotational axis of the engagement element , wherein the rotational axis of the engagement element is orthogonal to a rotational axis of the shifting element , wherein the effective section has a contact element for eccentrically contacting the engagement element.12. The shifting element of wherein the effective section is disposed at least in part in an inserting sector of the guide groove in which the engagement element is adapted to be engaged with the guide groove.13. The shifting element of wherein the effective section is disposed at least in part in an adjusting sector of the guide groove where the guide groove deviates from a direction of travel.14. The shifting element of wherein the effective section is disposed at least in part in an entry sector of the guide groove ...

VARIABLE VALVE DRIVE WITH A SLIDING CAM SYSTEM FOR AN INTERNAL COMBUSTION ENGINE

A variable drive for an internal combustion engine with a first gas exchange valve, in particular outlet valve, and a second gas exchange valve, in particular outlet valve. The variable valve drive has a sliding cam system. The sliding cam system has an axially displaceable cam carrier which, for the first gas exchange valve, has only two cams, namely a first cam and a second cam offset axially with respect thereto, and, for the second gas exchange valve, has only two cams, namely a third cam and a fourth cam offset axially with respect thereto. The first cam, the second cam, the third cam and the fourth cam differ from a zero lift cam. The first cam and the third cam are identical in design. The second cam and the fourth cam differ in design. 1. A variable valve drive for an internal combustion engine with a first gas exchange valve and a second gas exchange valve , comprising: an axially displaceable cam carrier which, for the first gas exchange valve, has a first cam and a second cam offset axially with respect thereto, and for the second gas exchange valve, has a third cam and a fourth cam offset axially with respect thereto, wherein:', 'depending on an axial position of the cam carrier either the first cam is positioned for actuating the first gas exchange valve and the third cam is positioned for actuating the second gas exchange valve or the second cam is positioned for actuating the first gas exchange valve and the fourth cam is positioned for actuating the second gas exchange valve;', 'the first cam, the second cam, the third cam and the fourth cam differ from a zero lift cam;', 'the first cam and the third cam are identical in design; and', 'the second cam and the fourth cam differ in design., 'a sliding cam system having2. The variable valve drive according to claim 1 , wherein the first and second gas exchange valves are outlet valves.3. The variable valve drive according to claim 1 , further comprising:separate force transmission devices for operative ...

Camshaft for a variable-stroke exchange valve train

A camshaft of a sliding cam valve train in an internal combustion engine is provided. A cam piece ( 2 ), which has cam strokes of different lengths and can be displaced on a carrier shaft ( 1 ), is mounted on a rolling bearing at a camshaft bearing point ( 12 ) of the internal combustion engine. The outer race ( 16 ) of the rolling bearing ( 13 ) is formed by a one-piece bearing ring ( 17 ) which surrounds the cam piece and said race is smaller than a revolution radius of the longer stroke h 2.

Engine Compression Brake Device for an Internal Combustion Engine

An engine compression brake device is disclosed. The brake device has at least one camshaft which has at least one cam group with at least one firing cam and at least one brake cam, and has at least one cam follower which is functionally assigned to the firing cam and which is provided for actuating at least one gas exchange valve in a firing mode, and has a cam follower which is functionally assigned to the brake cam and which is provided for actuating at least one gas exchange valve in a braking mode. The brake device further has a switchover device which is provided for the switchover between the firing mode and the braking mode, where the switchover device is provided for converting a torque of the camshaft into a force for the switchover between the firing mode and the braking mode.

VALVE CONTROL

A valve control for an internal combustion engine may include a tilt lever, a cam shaft, two cam groups arranged on the cam shaft, a roller bolt arranged on the tilt lever, and an adjusting assembly including a switching pin that engages through the roller bolt. The roller bolt may include two rotatable rollers. The switching pin may be adjustable into a switching position and into a home position. The switching pin may cooperate with a slotted guide of the cam shaft when in the switching position and may have no contact with the slotted guide when in the home position. When the switching pin is in the switching position, the two rollers may be axially adjustable via the adjusting assembly. The switching pin may be axially movable in the roller bolt and the two rollers may be axially movable on the roller bolt into one of two roller positions.

VALVE TRAIN OF AN INTERNAL COMBUSTION ENGINE

A valve train may include a camshaft, a cam sleeve adjustable in an axial direction between first and second positions and non-rotatably arranged on the camshaft, a first cam and at least one second cam, a pin and at least one cam follower mounted thereon, a guide contour arranged on the cam sleeve and having first and second guide tracks, and a control pin optionally engaging in the first or second guide track to adjust the cam sleeve between the first and second positions. The at least one cam follower in the first and second positions may interact respectively with the first and second cams. On the camshaft or an internal surface of the cam sleeve, first and second snap-in recesses and a third snap-in recess therebetween may be arranged. A snap-in device having a snap-in element preloaded into the snap-in recesses may be provided, the snap-in recess fixing the cam sleeve in the first or second position. The first and second guide tracks may intersect in an intersection region. Between the first and third snap-in recesses and between the second and third snap-in recesses, first and second snap-in humps may respectively be arranged. The snap-in element may engage in the third snap-in recess when the control pin is in the intersection region.

VALVE TRAIN OF AN INTERNAL COMBUSTION ENGINE

A valve train of an internal combustion engine may include a camshaft, first and second cams, a rocker arm assembly having a displacement bolt, which may be adjustable between at least first and second positions in the axial direction and on which at least one cam roller, may be mounted in an axially fixed and rotatable manner, wherein the displacement bolt may be mounted in associated bearing lugs of the rocker arm assembly, a guide contour arranged on the camshaft and having first and second guide tracks, a switching pin, which may be arranged in the displacement bolt and which may optionally engage with the first or second guide track to adjust the displacement bolt between the first and second positions. In the first and second positions, the cam roller may cooperate with the first and second cams, respectively. First and second catch recesses may be provided on the displacement bolt. A catch device may engage with a catch element, which may be biased into the first or second catch recess and which may secure the displacement bolt in the first or second position. The first and second guide tracks may cross one another in a crossing region. A third catch recess may be provided between the first and second catch recesses, wherein a first catch protuberance may be arranged between the first and the third catch recesses, and a second catch protuberance may be arranged between the second and the third catch recesses, wherein the catch element may engage with the third catch recess in the crossing region.

Control device for internal combustion engine

Provided is a control device for an internal combustion engine equipped with a cam switching device including a cam groove provided on the outer peripheral surface of a camshaft and an electromagnetic solenoid type actuator capable of protruding, toward the camshaft, an engagement pin that is engageable with the cam groove. The control device is configured, in causing the cam switching device to perform a cam switching operation, to perform energization of the actuator such that the engagement pin is seated on a forward outer peripheral surface, and to more lower, when an electric current (coil current) flowing through the actuator as a result of the energization is greater, an average electric voltage per unit time applied to the actuator in protruding the engagement pin toward the cam groove from the forward outer peripheral surface.

OIL PASSAGE STRUCTURE FOR ENGINE

An engine oil passage structure for an engine contributing to downsizing the engine and achieving protection of an oil passage against external forces is provided. Provided is an oil passage structure for an engine installed in a small vehicle, the engine including an engine body formed of a crankcase and a cylinder block and a cylinder head stacked inclined vehicle frontward on the crankcase, the crankcase, the cylinder block, and the cylinder head being integrally fastened. The oil passage structure includes, near a bent part formed by a case front wall of the crankcase and a cylinder front wall of the cylinder block forming a valley part by an obtuse angle, a right-left direction oil passage extending in a right-left direction along the valley part. 1. An oil passage structure for an engine installed in a small vehicle , the engine including an engine body formed of a crankcase and a cylinder block and a cylinder head stacked inclined vehicle frontward on the crankcase , the crankcase , the cylinder block , and the cylinder head being integrally fastened , the engine body including an oil passage for supplying oil to a valve gear provided at the cylinder head , the oil passage structure comprising:near a bent part formed by a case front wall of the crankcase and a cylinder front wall of the cylinder block forming a valley part by an obtuse angle, a right-left direction oil passage extending in a right-left direction along the valley part.2. The oil passage structure for an engine according to claim 1 , wherein the right-left direction oil passage is formed at the case front wall.3. The oil passage structure for an engine according to claim 1 , further comprising:a return oil passage for returning oil from the cylinder head to an oil pan provided below the crankcase, the return oil passage being formed to extend in a top-bottom direction at the front wall of the engine body, whereinthe right-left direction oil passage is positioned inner than the return oil ...

CAMSHAFT HAVING AN AXIALLY GUIDED SLIDING ELEMENT

A camshaft may include a shaft as well as a sliding element that is disposed on the shaft such that the sliding element is axially displaceable along a shaft axis. The shaft may comprise an external tooth for transmitting torque between the shaft and the sliding element. The external tooth may engage a mating tooth geometry formed in a passage of the sliding element. The sliding element on its axial end faces may comprise bearing collars that with the shaft form radial supporting bearings of the sliding element on the shaft. Further, the shaft may comprise cylindrical bearing portions for forming the radial supporting bearings, wherein the bearing portions can be configured with a diameter that is smaller than a diameter circumscribed by tips of the mating tooth geometry that protrude into the passage of the sliding element. 110.-. (canceled)11. A camshaft comprising:a sliding element with axial end faces, wherein the sliding element comprises on each of the axial end faces a bearing collar; anda shaft that receives the sliding element such that the sliding element is axially displaceable along a shaft axis, the shaft comprising an external tooth for transmitting torque between the shaft and the sliding element, wherein the external tooth engages a mating tooth geometry formed in a passage of the sliding element, wherein the bearing collars with the shaft form radial supporting bearings of the sliding element on the shaft, the shaft further comprising cylindrical bearing portions that form the radial supporting bearings, wherein a diameter of the cylindrical bearing portions is smaller than a diameter circumscribed by tips of the mating tooth geometry that protrude into the passage.12. The camshaft of wherein the mating tooth geometry comprises a hollow cylindrical portion with a tooth notch claim 11 , wherein the external tooth of the shaft engages the tooth notch of the hollow cylindrical portion.13. The camshaft of wherein the bearing collars of the sliding ...

CAMSHAFT HAVING AT LEAST ONE AXIALLY FIXED SLIDING ELEMENT

A camshaft for a multiple-cylinder internal combustion engine may include a sliding element comprising at least two cam elements, as well as a splined shaft that extends in an axial direction and on which the sliding element is received. The sliding element may comprise an internal spline system that interacts with an external spline system of the splined shaft such that the sliding element is seated fixedly on the splined shaft so as to rotate with the splined shaft. The sliding element may be received on the splined shaft such that the sliding element can, at least initially, be displaced axially. For axially-fixing the sliding element to the splined shaft, the sliding element may include a positively locking connection that is configured in the axial direction and is produced by way of at least one calked connection between the sliding element and the splined shaft. It should be understood that many camshafts include more than one sliding element. 111.-. (canceled)12. A camshaft for a multiple-cylinder internal combustion engine , the camshaft comprising:a sliding element comprising at least two cam elements for selective control of valves of the multiple-cylinder internal combustion engine, wherein the sliding element includes an internal spline system; anda splined shaft extending in an axial direction, wherein the sliding element is received on the splined shaft, wherein the internal spline system of the sliding element interacts with an external spline system of the splined shaft such that the sliding element is seated fixedly on the splined shaft so as to rotate with the splined shaft, wherein the sliding element is received on the splined shaft in an axially displaceable manner,wherein the sliding element is configured to be fixed in the axial direction to the splined shaft by way of a positively locking connection comprising a calked connection between the sliding element and the splined shaft.13. The camshaft of further comprising a plurality of sliding ...

Valve Train Device

A valve train device, in particular for an internal combustion engine, includes a support element and a cam element which can be moved axially relative to the support element. The valve train device further includes a switch unit for axially moving the cam element, which switch unit includes a displacer that is intended to be at least operatively inserted between the support element and the cam element in order to axially move the cam element. 110.-. (canceled)11. A valve train device , comprising:a support element;a cam element, wherein the cam element is axially movable relative to the support element and wherein the cam element has a multitrack cam; anda switch unit for axially moving the cam element, wherein the switch unit includes a first displacer that is operatively insertable between the support element and the cam element to axially move the cam element in a first direction.12. The valve train device according to claim 11 , wherein the support element is fixed to a housing.13. The valve train device according to claim 11 , wherein the first displacer is radially movable relative to the cam element.14. The valve train device according to claim 11 , wherein the first displacer has an inclined surface and wherein the inclined surface is insertable between the cam element and the support element.15. The valve train device according to claim 14 , wherein the inclined surface comes into contact with the cam element and axially moves the cam element when operatively inserted between the support element and the cam element.16. The valve train device according to claim 11 , wherein the switch unit includes a housing and wherein the displacer is substantially mounted on the housing.17. The valve train device according to claim 11 , wherein the switch unit has a second displacer that is operatively insertable between the support element and the cam element to axially move the cam element in a second direction that is counter to the first direction.18. The valve train ...

METHOD OF NOISE FILTERING A SLIDING CAMSHAFT ACTUATOR PIN POSITION OUTPUT SIGNAL

A method of noise filtering a sliding camshaft actuator pin position output signal includes determining an actual pin position output signal period of a sliding camshaft actuator that occurs within a predetermined output signal period measurement window and establishing a pin position output signal filter window based on the actual pin position output signal period. Thereafter, the actual pin position output signal period from the sliding camshaft actuator is monitored by a control module and signals that occur outside of the pin position output signal filter window are rejected accordingly to prevent responding to false triggers. 1. A method of noise filtering a sliding camshaft actuator pin position output signal comprising:determining an actual pin position output signal period of a sliding camshaft actuator that occurs within a predetermined output signal period measurement window;establishing a pin position output signal filter window based on the actual pin position output signal period;monitoring the actual pin position output signal period from the sliding camshaft actuator; andrejecting signals that occur outside of the pin position output signal filter window.2. The method of wherein determining further comprises establishing the predetermined output signal period measurement window based on a predetermined nominal output signal period and a percentage of the predetermined nominal output signal period.3. The method of wherein establishing further comprises increasing the actual pin position output signal period by a predetermined percentage of the actual pin position output signal period.4. The method of wherein monitoring further comprises reading a pulse width modulated signal output from a Hall Effect sensor of the sliding camshaft actuator.5. The method of further comprising monitoring the actual pin position output signal period using a control module.6. The method of wherein rejecting further comprises filtering out signals occurring before the start ...

Multiple variable valve lift apparatus

A multiple variable valve lift apparatus may include a moving cam formed of a hollow cylindrical shape, configured to be moveable in an axial direction of a camshaft while being rotated with the camshaft, and forming a plurality of cams implementing a cam guide protrusion device and different valve lifts from each other; an operation device selectively guiding a cam guide protrusion device to move the moving cam in the axial direction of the camshaft; a controller configured for controlling an operation of the operation device; a valve opening/closing device in contact with any one cam among the plurality of cams; a plurality of stopper grooves formed at an external circumference of the camshaft; and a stopper device provided at the moving cam and inserted to the stopper groove to be rotated at a position after the moving cam is moved.

SLIDING CAMSHAFT

A sliding camshaft is provided which may include a base shaft, an over-molded trigger wheel, and a distal axially movable structure. The distal axially movable structure may further include a distal journal in addition to at least one standard journal and lobe packs. A control groove is defined in the distal axially movable structure. The over-molded trigger wheel is mounted on the distal axially movable structure. The over-molded trigger wheel is operatively configured to move between at least a first position and a second position together with the distal axially movable structure via engagement between the control groove and an actuator. The over-molded trigger wheel may be press fitted on distal axially movable structure and is adapted to accurately communicate with a sensor regardless of the position of the distal axially movable structure. 1. A sliding camshaft comprising:a base shaft extending along a longitudinal axis, the base shaft being configured to rotate about the longitudinal axis;a distal axially movable structure mounted on the base shaft, the distal axially movable structure being axially movable relative to the base shaft between a first position and a second position, the distal axially movable structure being rotationally fixed to the base shaft; andan over-molded trigger wheel affixed to the distal axially movable structure.2. The sliding camshaft as defined in further comprising an axially movable structure mounted on the base shaft axially spaced from the distal axially movable structure.3. The sliding camshaft as defined in wherein the over-molded trigger wheel is operatively configured to maintain a fixed radial distance from a sensor regardless of whether the distal axially movable structure is in the first position or the second position.4. The sliding camshaft as defined in wherein the distal axially movable structure further comprises:a first lobe pack and a second lobe pack, each of the first and second lobe packs including at least ...

ADJUSTABLE CAMSHAFT

An adjustable camshaft for an internal combustion engine includes an outer shaft and a support shaft defining at least one bore with a relief groove configured outside of the bore. The support shaft extends along a longitudinal axis. The outer shaft may include a cam element disposed on the support shaft such that the outer shaft is displaceable along the support shaft along the longitudinal axis wherein the outer shaft is latchable on the support shaft in at least two axial latching positions. A biasing means, a press-fit retainer, and a latching element are disposed within the bore such that the biasing means urges the latching element toward any one recess of the plurality of recesses defined in the outer shaft.

VARIABLE VALVE DRIVE

The present disclosure relates to a variable valve drive, in particular with a sliding cam system, for an internal combustion engine. The variable valve drive has a shaft and a cam carrier which is arranged rotationally conjointly and axially displaceably on the shaft and which has a first cam and a second cam. The variable valve drive has an actuator device for axially displacing the cam carrier, and has a carrying device which at least partially engages around a lever axle of a force transmission device and carries the actuator device. The variable valve drive can offer the advantage that an arrangement of the actuator device which is expedient in terms of structural space is made possible in the region of the lever axle. At the same time, support of the actuator device by means of the carrying device on the lever axle can stiffen the flexible lever axle by means of the engaging-around configuration. 1. A variable valve drive , in particular with a sliding cam system , for an internal combustion engine , comprising:a shaft;a cam carrier which is arranged rotationally conjointly and axially displaceably on the shaft and which has a first cam and a second cam;a force transmission device with a lever axle and with a first force transmission element which is pivotable about the lever axle and which, in a manner dependent on an axial position of the cam carrier, selectively produces an operative connection between the first cam and a gas exchange valve of the internal combustion engine or between the second cam and the gas exchange valve;an actuator device for axially displacing the cam carrier; anda carrying device which at least partially engages around the lever axle and carries the actuator device.2. The variable valve drive according to claim 1 , wherein the actuator device includes a first actuator and a second actuator claim 1 , the first and second actuators received at least partially in the lever axle or carried by the carrying device outside the lever axle.3 ...

DYNAMIC LOCKING AND RELEASING CAM LOBE

Disclosed is a method and system for intermittently operating poppet valves in an internal combustion engine when desired by the selective locking or unlocking of one or more cam lobes with the camshaft. One or more cam lobes, with a small radial clearance, ride on a camshaft such that an engagement mechanism may be activated as desired to lock the cam lobe to the camshaft, thereby activating the respective poppet valve. The cam lobe is prevented from moving axially to ensure correct alignment with a follower. A suitable holding device may be used to ensure the non-activated cam lobes are restrained at a suitable orientation relative to the cam follower. 1. A cam driven reciprocating internal combustion engine comprising:a rotating cam shaft comprising a groove in mechanical communication with a plurality of cam lobes, wherein each cam lobe of said plurality of cam lobes is mechanically coupled to and controls the operation of an intake valve and/or an exhaust valve associated with a respective cylinder of said internal combustion engine, and wherein said each cam lobe of said plurality of cam lobes comprising a keyway slot and a tapered portion extending along an interior diameter to said keyway slot;at least one coupler that selectively couples a rotational force of said rotating cam shaft to at least one cam lobe of said plurality of cam lobes, said at least one coupler comprising a key that sits in said groove and is engageable with said keyway.2. The cam driven reciprocating internal combustion engine of claim 1 , wherein said each cam lobe of said plurality of cam lobes further comprises a groove on the inside portion of said each cam lobe of said plurality of cam lobes that contacts said rotating cam shaft and said rotating cam shaft comprises a fastener that fits within said groove disallowing said each cam lobe of said plurality of cam lobes from drifting axially on said rotating cam shaft during operation.3. The cam driven reciprocating internal combustion ...

Valve Drive Device for an Internal Combustion Engine

A valve drive device for an internal combustion engine is disclosed. The valve drive device has an axially displaceable cam element and an adjusting device with a first engagement element which displaces the cam element axially into a first switching position and a second engagement element which displaces the cam element axially into a second switching position. The adjusting device has a first slotted guide track in which the first engagement element is guided in the first switching position and a second slotted guide track in which the second engagement element is guided in the second switching position. The first engagement element is positively coupled to the second engagement element. The adjusting device includes a triggering device which holds the first engagement element fixedly in the second switching position counter to a restoring force. A method for axial displacement of a rotating cam element is also disclosed. 110-. (canceled)11. A valve drive device for an internal combustion engine , comprising:an axially displaceable cam element; andan adjusting device including a first engagement element that displaces the cam element axially into a first switching position and a second engagement element that displaces the cam element axially into a second switching position;wherein the adjusting device has a first slide track in which the first engagement element is guided in the first switching position and a second slide track in which the second engagement element is guided in the second switching position and wherein the first engagement element is positively coupled with the second engagement element;wherein the adjusting device includes a triggering device that holds the first engagement element in the second switching position against a restoring force;wherein the first slide track moves the first engagement element in an oscillating manner in a radial direction of the cam element during a rotation of the cam element in the first switching position.12. ...

VALVE TRAIN FOR AN INTERNAL COMBUSTION ENGINE

A valve train may include a camshaft, a cam follower, and first and second cams mounted axially adjacent in a torque-proof manner on the camshaft. The valve train may also include an adjustment arrangement having adjustable first and second mechanical engagement elements, which may each cooperate with at least one slide guide arranged on the camshaft. The valve train may further include a control shaft or control slide forming a stop for the first and second engagement elements and adjusting the first and second engagement elements into respective switching positions. The cam follower may be drivingly connected with the first and second cams in first and second positions, respectively. The first and second engagement elements may each be adjustable between respective basic positions, in which no contact exists with the associated slide guide, and the respective switching positions, in which the respective engagement element cooperates with the associated slide guide. 1. A valve train for an internal combustion engine , comprising:a camshaft and a cam follower;a first cam mounted in a torque-proof manner on the camshaft, and a second cam arranged in a torque-proof manner on the camshaft axially adjacent to the first cam;an adjustment arrangement having an adjustable first mechanical engagement element, which cooperates with at least one slide guide arranged on the camshaft, and an adjustable second mechanical engagement element, which cooperates with at least a second slide guide arranged on the camshaft; and wherein the cam follower, in the first position, is drivingly connected with the first cam, and in the second position, is drivingly connected with the second cam; and', 'wherein the first engagement element and the second engagement element are each adjustable between respective basic positions, in which no contact exists with the associated slide guide, and the respective switching positions, in which the respective engagement element cooperates with the ...

VALVE TRAIN FOR AN INTERNAL COMBUSTION ENGINE

A valve train may include a camshaft having first and second slide guides, first and second cams mounted axially adjacent in torque-proof manners on the camshaft, and a cam follower adjustable between a first position, in which the cam follower is drivingly connected with the first cam, and a second position, in which the cam follower is drivingly connected with the second cam. The valve train may also include an adjustment arrangement having adjustable mechanical first and second engagement elements for axially adjusting the cam follower between first and second positions. Each engagement element may be adjustable between basic positions, in which no contact exists with a respective one of the slide guides, and switching positions, in which the respective engagement element cooperates with the slide guide. Each engagement element may have a spring that prestresses it into the switching position. The valve train may further include an arresting device and an actuator for each engagement element, wherein the arresting device, when in a locked position, holds the associated engagement element in the basic position, and the actuator releases the arresting device 1. A valve train for an internal combustion engine , comprising:a camshaft having a first slide guide and a second slide guide thereon;a first cam mounted in a torque-proof manner on the camshaft, and a second cam arranged in a torque-proof manner on the camshaft axially adjacent to the first cam;a cam follower adjustable between a first position, in which the cam follower is drivingly connected with the first cam, and a second position, in which the cam follower is drivingly connected with the second cam; and an adjustable mechanical first engagement element for axially adjusting the cam follower from the first position into the second position, the first engagement element cooperating with at least the first slide guide, the first engagement element being adjustable between a basic position, in which no ...

DETENT ASSEMBLY AND A METHOD OF ASSEMBLING THE DETENT ASSEMBLY

A detent assembly and a method of assembling the detent assembly are disclosed. The detent assembly includes a first shaft rotatable about a longitudinal axis and has an outer surface. The first shaft defines a cavity having an opening defined by the outer surface. The detent assembly further includes a camshaft defining an aperture along the longitudinal axis to present an inner wall of the camshaft that circumscribes the longitudinal axis. The inner wall defines a plurality of recesses spaced from each other. The detent assembly also includes a self-contained plunger unit that is secured to the first shaft in the cavity as a unit. A plunger of the self-contained plunger unit engages the inner wall as the camshaft is disposed over the self-contained plunger unit so that the plunger rests in one of the recesses of the camshaft to selectively secure together the first shaft and the camshaft. 1. A detent assembly comprising:a first shaft rotatable about a longitudinal axis and having an outer surface, with the first shaft defining a cavity having an opening defined by the outer surface;a camshaft defining an aperture along the longitudinal axis to present an inner wall of the camshaft that circumscribes the longitudinal axis, with the inner wall defining a plurality of recesses spaced from each other; anda self-contained plunger unit that is secured to the first shaft in the cavity as a unit, with a plunger of the self-contained plunger unit engaging the inner wall as the camshaft is disposed over the self-contained plunger unit so that the plunger rests in one of the recesses of the camshaft to selectively secure together the first shaft and the camshaft.2. An assembly as set forth in wherein the self-contained plunger unit includes a housing secured to the first shaft in the cavity and a biasing member contained in the housing claim 1 , with the plunger movably coupled to the housing and continuously biased outwardly away from the longitudinal axis by the biasing ...

CAMSHAFT AND MANUFACTURING METHOD THEREFOR

Multiple tubular members that include multiple cam members and having cam parts are connected to each other to form a single cam tube Multiple female splines which are partially arranged on an inner tube surface of the tubular members which include the cam members and mate with male splines formed on the outer tube surface of a drive shaft and the cam tube rotates integrally with the drive shaft and is capable of moving freely in the axial direction thereof. 1. A camshaft extending over three or more cylinders arranged in series in an engine , the camshaft comprising:a plurality of cam parts each having a plurality of cam profiles having different shapes from each other with respect to one intake or exhaust valve;one tubular cam tube on which the plurality of cam parts is arranged to be spaced apart from each other in an axial direction; andone driving shaft inserted into the cam tube,wherein the cam tube is configured by connecting a plurality of tubular members which includes a tubular cam member including the cam part to each other,wherein a female spline is arranged on an inner tubular surface of at least each tubular member which includes the cam member among the plurality of tubular members, and a plurality of the female splines are partially arranged in the axial direction of the cam tube on an inner tubular surface of the cam tube,wherein a male spline is arranged on an outer tubular surface of the driving shaft, andwherein, in a state where the driving shaft is inserted into the cam tube, the plurality of female splines and the male spline are fitted to each other so that the cam tube is configured to rotate integrally with the driving shaft and be movable in an axial direction thereof.2. The camshaft according to claim 1 , wherein the cam member includes the plurality of cam parts claim 1 , and the female spline is formed at least on a range between the plurality of cam parts in the axial direction of the driving shaft.3. The camshaft according to claim 1 ...

Valve operating cam drive for combustion engines

The valves of the engine are operated by one of a number of cams (4a to 4c) which are integral with a sleeve (5) and which are located next to one another. The sleeve is connected to the camshaft (6) by e.g. splines so that it rotates with the shaft but can be moved axially. The sleeve is moved axially by rods (15,18), which can be fed-in radially towards the camshaft, and which engage with axial cam faces (9,10) on the endfaces of the sleeve. The sleeve is positioned on the camshaft by a spring-loaded ball (23) which engages with grooves in the sleeve bore.

Valve drive for gas exchange valves of internal combustion engine, has camshaft, two cam pieces and holders, which are integrally formed on upper part of two-piece cylinder head housing

The valve drive has a camshaft (1,2) and two cam pieces (5), which are guided on the camshaft in torque proof and axially adjustable manner. The holders (23) are integrally formed on an upper part (3) of two-piece cylinder head housing. The passage or receiving opening for the radial bearing is completely surrounded.

Valve drive device

Die Erfindung geht aus von einer Ventiltriebvorrichtung, insbesondere einer Brennkraftmaschine, mit einer Nockenwelle (10a; 10b), mit zumindest einem axial auf der Nockenwelle (10a; 10b) verschiebbaren Nockenelement (11a, 12a; 11b, 12b) und mit einer Anschlagvorrichtung (13a; 13b), die dazu vorgesehen ist, einen Weg in axialer Richtung (14a; 14b) des Nockenelements (11a, 12a; 11b, 12b) zu begrenzen. Es wird vorgeschlagen, dass die Anschlagvorrichtung (13a; 13b) zumindest ein mit der Nockenwelle (10a; 10b) verbundenes Anschlagmittel (15a, 16a; 15b, 16b) aufweist. The invention is based on a valve drive device, in particular an internal combustion engine, with a camshaft (10a, 10b), with at least one cam element (11a, 12a, 11b, 12b) displaceable axially on the camshaft (10a, 10b) and with a stop device (13a 13b) intended to define a path in the axial direction (14a; 14b) of the cam member (11a, 12a; 11b, 12b). It is proposed that the stop device (13a, 13b) has at least one stop means (15a, 16a, 15b, 16b) connected to the camshaft (10a; 10b).

combustion engine valve

Die Erfindung geht aus von einer Brennkraftmaschinenventiltriebumschaltvorrichtung mit einer Umschalteinheit (36, 36a). Es wird vorgeschlagen, dass die Umschalteinheit (36, 36a) eine Ausführeinheit (38, 38a) aufweist, welche dazu vorgesehen ist, aufgrund zumindest eines Signals einen ersten Schaltvorgang und danach unabhängig von einer elektronischen Auswertung einen zweiten Schaltvorgang auszuführen. The invention is based on an internal combustion engine valve drive switching device with a switching unit (36, 36a). It is proposed that the switching unit (36, 36a) has an execution unit (38, 38a) which is provided to carry out a second switching operation on the basis of at least one signal and then independently of an electronic evaluation.

Ventiltrieb mit Ventilhubumschaltung für die Gaswechselventiele eines 4-Takt-Verbrennungsmotors

Die Erfindung betrifft einen Ventiltrieb mit Ventilhubumschaltung für die Gaswechselventile (5) eines 4-Takt-Verbrennungsmotors mit folgenden Merkmalen: DOLLAR A - eine Zahnwelle (1, 1') mit axialer Außenverzahnung (7, 7') und zumindest einem Nockenstück (2, 2') pro Zylinder (22, 22'), das eine dazu passende Innenverzahnung aufweist und das verdrehfest und axial verschiebbar mit der Zahnwelle (1, 1') verbunden ist; DOLLAR A - das Nockenstück (2, 2') weist pro Gaswechselventil (5) zumindest zwei nebeneinander liegende Nocken (8, 9, 8', 9') mit unterschiedlichem Hub und gleichem Grundkreisdurchmesser sowie mit zwei am Umfang des Nockenstücks (2, 2') angeordneten, vorzugsweise spiegelsymmetrisch ausgebildeten Verschiebenuten (12, 13, 12', 13') auf, deren vier Endstücke (14, 15) am Umfang des Nockenstücks (2, 2') auslaufen; DOLLAR A - gehäusefeste, radial zu dem Nockenstück (2, 2') hin bewegbare Aktuatorstifte (3, 3'), durch deren Zusammenwirken mit den Verschiebenuten (12, 13, 12', 13') das Nockenstück (2, 2') axial verschiebbar ist. DOLLAR A Der Platzbedarf der Verschiebenuten (12, 13, 12', 13') und ihrer Aktuatorstifte (3, 3') wird dadurch verringert, daß die Verschiebenuten (12, 13, 12', 13') aufgrund ihres geringen axialen Abstands sich kreuzen und einen einzigen Aktuatorstift (3, 3') für beide Verschieberichtungen aufweisen.

Valve gear for internal-combustion engine, has cam shaft, which has carrier shaft and cam part, where cam part is provided with guiding element

The valve gear has a cam shaft, which has a carrier shaft and a cam part. The cam part is provided with a guiding element (19). A slotted link channel is enabled and another slotted link channel is disabled for actuating pin (15). A ring is provided with flat material.

Valve gear of an internal combustion engine

Vorgeschlagen ist ein Ventiltrieb (1) einer Brennkraftmaschine, mit einer eine Trägerwelle (3) und ein darauf drehfest und axialverschiebbar angeordnetes Nockenstück (4) umfassenden Nockenwelle (2), welches Nockenstück zumindest eine Nockengruppe (5, 6) unmittelbar benachbarter Nocken (7a, 7b, 7c, 8a, 8b, 8c) unterschiedlicher Erhebungen zur variablen Betätigung eines Gaswechselventils und eine Axialkulisse (13) mit zwei sich kreuzenden Kulissenbahnen (14, 15) aufweist, und mit einem in die Axialkulisse radial zur Nockenwelle einkoppelbaren Betätigungsstift (16) zum Verschieben des Nockenstücks in Richtung beider Kulissenbahnen. Dabei ist zumindest ein weiterer Betätigungsstift (17) vorgesehen, derart, dass die Anzahl der in die Axialkulisse (13) einkoppelbaren Betätigungsstifte n >= 2 beträgt und dass die Anzahl der Nocken einer Nockengruppe n + 1 beträgt. Proposed is a valve train (1) of an internal combustion engine, comprising a camshaft (2) comprising a carrier shaft (3) and a cam piece (4) rotatably and axially displaceable thereon, which cam piece has at least one cam group (5, 6) of immediately adjacent cams (7a, 7b, 7c, 8a, 8b, 8c) of different elevations for the variable actuation of a gas exchange valve and an axial slide (13) with two intersecting slide tracks (14, 15), and with a radially engageable in the Axialkulisse camshaft actuating pin (16) for Moving the cam piece in the direction of both slide tracks. In this case, at least one further actuating pin (17) is provided, such that the number of actuation pins which can be coupled into the axial slotted guide (13) is n> = 2 and that the number of cams of a cam group is n + 1.

Valve gear for internal combustion engine has facility whereby in first and second axial positions of cam carrier first and second stop faces fixed on cam carrier bear against respective first and second stop faces fixed on cylinder head

The valve gear for an internal combustion engine has a camshaft (1) with at least one cam carrier which has at least one cam upon which are formed two different cam tracks. In the first and second axial positions of the cam carrier first and second stop faces fixed on the cam carrier bear against respective first and second stop faces fixed on the cylinder head (31) of the engine. Means are provided for the applying of an axial tensioning force are formed between the camshaft and cam carrier.

Nockenwellenverstellvorrichtung