Pump Drive System with Hydraulic Tappets

A cryogenic pump comprising a shaft disposed in a bearing. The shaft rotates with respect to the bearing housing, and the shaft includes an end with an angled face. The pump includes a drive at one end of the bearing housing. A tappet passage is formed through the drive housing. A pushrod housing connects to the drive housing. The pump includes a piston and a tappet sliding within the tappet passage. The tappet has a base end disposed within the tappet passage and a rod end extending below the tappet end of the drive housing. A fluid cavity is in the tappet passage between the piston and the tappet. The pump includes a pushrod connected to the tappet. The angled face of the shaft rotates and drives the piston toward the drive housing, pushing fluid within the fluid cavity against the tappet, driving the pushrod away from the drive housing. 1. A cryogenic pump comprising:a bearing housing having a shaft end and a drive end;a shaft having an upper end and a lower end disposed in the bearing housing at the shaft end and rotatable with respect to the bearing housing about a longitudinal axis, the lower end of the shaft including an angled face oriented transverse to the longitudinal axis;a drive housing having a piston end and a tappet end, the drive housing disposed at the drive end of the bearing housing, at least one tappet passage being formed through the drive housing substantially along the longitudinal axis between the piston end and the tappet end;a pushrod housing connected to the tappet end of the drive housing;at least one piston slidably disposed at least partially within the at least one tappet passage, a cavity end of the piston disposed within the tappet passage;at least one tappet slidably disposed at least partially within the at least one tappet passage, the at least one tappet having a base end disposed within the tappet passage and a rod end extending below the tappet end of the drive housing, wherein a fluid cavity substantially filled with a fluid ...

Pump drive system with hydraulic tappets

A cryogenic pump comprising a shaft disposed in a bearing. The shaft rotates with respect to the bearing housing, and the shaft includes an end with an angled face. The pump includes a drive at one end of the bearing housing. A tappet passage is formed through the drive housing. A pushrod housing connects to the drive housing. The pump includes a piston and a tappet sliding within the tappet passage. The tappet has a base end disposed within the tappet passage and a rod end extending below the tappet end of the drive housing. A fluid cavity is in the tappet passage between the piston and the tappet. The pump includes a pushrod connected to the tappet. The angled face of the shaft rotates and drives the piston toward the drive housing, pushing fluid within the fluid cavity against the tappet, driving the pushrod away from the drive housing.

HYDRAULIC FAN CIRCUIT HAVING ENERGY RECOVERY

A hydraulic fan circuit is disclosed. The hydraulic fan circuit may have a primary pump, a high-pressure passage fluidly connected to the primary pump, and a low-pressure passage fluidly connected to the primary pump. The hydraulic fan circuit may also have at least one accumulator in selective fluid communication with at least one of the high- and low-pressure passages, a motor, and a fan connected to the motor. The hydraulic fan circuit may further have a fan isolation valve fluidly connected to the high- and low-pressure passages. The fan isolation valve may be movable between a flow-passing position at which the motor is fluidly connected to the primary pump via the high- and low-pressure passages, and a flow-blocking position at which the motor is substantially isolated from the primary pump. 1. A hydraulic fan circuit , comprising:a primary pump;a high-pressure passage fluidly connected to the primary pump;a low-pressure passage fluidly connected to the primary pump;at least one accumulator in selective fluid communication with at least one of the high- and low-pressure passages;a motor;a fan connected to the motor; anda fan isolation valve fluidly connected to the high- and low-pressure passages, the fan isolation valve being movable between a flow-passing position at which the motor is fluidly connected to the primary pump via the high- and low-pressure passages, and a flow-blocking position at which the motor is substantially isolated from the primary pump.2. The hydraulic fan circuit of claim 1 , wherein the at least one accumulator includes:a high-pressure accumulator associated with the high-pressure passage; anda low-pressure accumulator associated with the low-pressure passage.3. The hydraulic fan circuit of claim 2 , further including a discharge valve in fluid communication with the high- and low-pressure accumulators claim 2 , the discharge valve being configured to:selectively pass fluid from the primary pump to the high-pressure accumulator and ...

PUMP SYSTEM HAVING OPEN-LOOP TORQUE CONTROL

A pump system is disclosed. The pump system may have a pump with a displacement that is variable, and an actuator movable to adjust the displacement of the pump. The pump system may also have an electro-hydraulic valve fluidly connected to the actuator and configured to control movement of the actuator, and a variable resistor mechanically connected to at least one of the actuator and the pump. The variable resistor may be adjustable by movement of the at least one of the actuator and the pump to vary a current passing through the electro-hydraulic valve. 1. A pump system , comprising:a pump having a displacement that is variable;an actuator movable to adjust the displacement of the pump;an electro-hydraulic valve fluidly connected to the actuator and configured to control movement of the actuator; anda variable resistor mechanically connected to at least one of the actuator and the pump, and being adjustable by movement of the at least one of the actuator and the pump to vary a current passing through the electro-hydraulic valve.2. The pump system of claim 1 , wherein the actuator is fluidly connected at a first end to an output of the pump and at an opposing second end to the electro-hydraulic valve.3. The pump system of claim 2 , wherein the electro-hydraulic valve includes:a pilot-operated valve element movable from a first position at which the second end of the actuator is fluidly connected to the output of the pump, and a second position at which the second end of the actuator is fluidly connected to a low-pressure tank; anda solenoid-operated valve element operable to control movement of the pilot-operated valve element between the first and second positions.4. The pump system of claim 3 , further including:at least one working actuator;an outlet passage extending from the pump to the at least one working actuator;a control valve disposed within the outlet passage and configured to regulate operation of the at least one working actuator;a first pilot passage ...

PUMP HAVING PORT PLATE PRESSURE CONTROL

A pump is disclosed. The pump may have a housing, a body rotatably disposed within the housing and at least partially defining a plurality of barrels, a plurality of plungers associated with the plurality of barrels, and a swashplate tiltable by a swivel torque to vary a displacement of the plurality of plungers relative to the plurality of barrels. The pump may also have a port plate with an inlet port, a discharge port, and a protrusion. The port plate may be configured to engage an end of the rotatable body. The pump may further have at least one piston disposed within the housing and configured to selectively engage the protrusion of the port plate to rotate the port plate and adjust the swivel torque. 1. A pump , comprising:a housing;a body rotatably disposed within the housing and at least partially defining a plurality of barrels;a plurality of plungers associated with the plurality of barrels;a swashplate tiltable by a swivel torque to vary a displacement of the plurality of plungers relative to the plurality of barrels; an inlet port;', 'a discharge port; and', 'a protrusion; and, 'a port plate configured to engage an end of the rotatable body and havingat least one piston disposed within the housing and configured to selectively engage the protrusion of the port plate to rotate the port plate and adjust the swivel torque.2. The pump of claim 1 , wherein the protrusion includes a tab that protrudes radially outward from a periphery of the port plate.3. The pump of claim 2 , wherein the at least one piston includes an actuator piston and a biasing piston.4. The pump of claim 3 , wherein the actuator and biasing pistons are arranged to urge the port plate in opposing rotational directions.5. The pump of claim 4 , wherein the actuator piston is oriented to urge the port plate in a rotational direction opposite a rotational direction of the body.6. The pump of claim 3 , wherein the actuator piston has a pressure area larger than a pressure area of the biasing ...

HYDRAULIC FLUID SYSTEM

A hydraulic fluid system for a mobile machine includes a closed loop hydraulic fan circuit. The hydraulic fan circuit includes a primary pump, a motor fluidly connected to the primary pump, and a fan driven by the motor. The hydraulic fan circuit also includes a supply passage extending from the primary pump to the motor, a return passage extending from the motor to the primary pump, and a first accumulator selectively fluidly connected to at least one of the supply and return passages via a charge valve. The hydraulic fluid system also includes at least one open loop hydraulic circuit fluidly connected to the first accumulator. 1. A hydraulic fluid system for a mobile machine , comprising: a primary pump,', 'a motor fluidly connected to the primary pump,', 'a fan driven by the motor', 'a supply passage extending from the primary pump to the motor,', 'a return passage extending from the motor to the primary pump, and', 'a first accumulator selectively fluidly connected to at least one of the supply and return passages via a charge valve; and, 'a closed loop hydraulic fan circuit, the hydraulic fan circuit including'}at least one open loop hydraulic circuit fluidly connected to the first accumulator.2. The hydraulic fluid system of claim 1 , further comprising a restrictive orifice disposed between the charge valve and the first accumulator.3. The hydraulic fluid system of claim 1 , wherein the at least one open loop hydraulic circuit is fluidly connected to the first accumulator via a junction disposed between the charge valve and the first accumulator.4. The hydraulic fluid system of claim 1 , wherein the at least one open loop hydraulic circuit comprises a brake system of the mobile machine.5. The hydraulic fluid system circuit of claim 1 , wherein the at least one open loop hydraulic circuit comprises a steering system of the mobile machine.6. The hydraulic fluid system of claim 1 , further comprising a resolver fluidly connected to the supply and return passages ...

HYDRAULIC CIRCUIT HAVING ENERGY STORAGE AND REUSE

A hydraulic circuit is disclosed. The hydraulic circuit may have a pump, a motor, a tank, and an accumulator. The hydraulic circuit may also have a valve movable between a first position at which an output of the pump is fluidly connected to the tank and the accumulator is fluidly connected to the motor, and a second position at which the output of the pump is fluidly connected to the motor. 1. A hydraulic circuit , comprising:a pump;a motor;a tank;an accumulator; anda valve movable between a first position at which an output of the pump is fluidly connected to the tank and the accumulator is fluidly connected to the motor, and a second position at which the output of the pump is fluidly connected to the motor.2. The hydraulic circuit of claim 1 , wherein when the valve is in the second position claim 1 , fluid pressurized by the pump is allowed to flow into the accumulator.3. The hydraulic circuit of claim 2 , wherein the valve includes a check element disposed between the pump and the accumulator when the valve is in the second position.4. The hydraulic circuit of claim 2 , wherein the valve is a solenoid-operated claim 2 , 2-position valve that is spring-biased toward the second position.5. The hydraulic circuit of claim 2 , wherein the motor includes an outlet that is always fluidly connected to the tank.6. The hydraulic circuit of claim 1 , further including a selector valve selectively operable to allow fluid from another circuit to enter the accumulator.7. The hydraulic circuit of claim 6 , wherein when the valve is in the second position claim 6 , the pump is blocked from the accumulator.8. The hydraulic circuit of claim 1 , further including a fan mechanically driven by the motor.9. The hydraulic circuit of claim 1 , wherein:the pump and motor both have fixed displacement; andthe hydraulic circuit further includes speed control valve configured to selectively relieve at least a portion of an output of the pump to the tank to control a speed of the motor.10. ...

REGENERATION CONFIGURATION FOR CLOSED-LOOP HYDRAULIC SYSTEMS

A hydraulic system is disclosed. The hydraulic system may have a pump, and a hydraulic actuator having a first chamber and a second chamber. The hydraulic system may also have a first pump passage fluidly communicating the pump with the first chamber, a second pump passage connected to the pump, and a regeneration valve. The regeneration valve may be movable from a first position at which the second pump passage is connected to the second chamber and the second chamber is isolated from the first chamber, to a second position at which the second pump passage is blocked and the second chamber is connected to the first chamber. 1. A hydraulic system , comprising:a pump;a hydraulic actuator having a first chamber and a second chamber;a first pump passage fluidly communicating the pump with the first chamber;a second pump passage connected to the pump; anda regeneration valve movable from a first position at which the second pump passage is connected to the second chamber and the second chamber is isolated from the first chamber, to a second position at which the second pump passage is blocked and the second chamber is connected to the first chamber.2. The hydraulic system of claim 1 , wherein:the pump is connected to the hydraulic actuator in a closed-loop manner when the regeneration valve is in the first position; andthe pump is connected to the hydraulic actuator in an open-loop manner when the regeneration valve is in the second position.3. The hydraulic system of claim 1 , wherein the pump has variable-displacement and over-center functionality.4. The hydraulic system of claim 1 , wherein the regeneration valve is solenoid operated claim 1 , and spring-biased toward the first position.5. The hydraulic system of claim 4 , wherein the first pump passage fluidly communicates the pump with the hydraulic actuator via the regeneration valve.6. The hydraulic system of claim 4 , wherein the first pump passage bypasses the regeneration valve.7. The hydraulic system of claim ...

Shaft arrangement for an axial piston pump assembly

A shaft arrangement for an axial piston pump assembly to couple to a rotatable member such as a gear therewith. A shaft extends at least partially through a housing chamber of the pump about a longitudinal axis. Reciprocating pistons are disposed within the chamber radially about the shaft. A cam unit is fitted over the shaft and provides an angled camming surface to engage the pistons. Bearing assemblies are fitted over the cam unit. An adapter can be fitted over the proximal end of the cam unit. The adapter has a distal surface which may abut the bearing assembly and be axially spaced from the cam unit, and an outer radial surface to engage the rotatable member. A clamping device provides a desired clamp load path between the rotatable member, the adapter, the cam unit, the bearing assemblies and the shaft.

HYDRAULIC CIRCUIT CONTROL

A hydraulic circuit is provided. The hydraulic circuit includes a primary pump, a displacement actuator, a charge pump, a direction control valve, and a pressure control valve. The displacement actuator is associated with the primary pump. The charge pump is configured to generate a flow of a pilot fluid. The direction control valve is configured to control the flow of the pilot fluid to the displacement actuator to affect a movement direction of the displacement actuator. The pressure control valve is configured to control a pressure of the pilot fluid to affect a movement amount of the displacement actuator. Further, the hydraulic circuit includes a controller. The controller is configured to control the direction and the pressure control valves to adjust a displacement of the primary pump based at least on one of a sensed engine parameter or a mode of operation of the primary pump. 1. A hydraulic circuit comprising:a primary pump;a displacement actuator associated with the primary pump;a charge pump configured to generate a flow of a pilot fluid;a direction control valve configured to control the flow of the pilot fluid to the displacement actuator to affect a movement direction of the displacement actuator;a pressure control valve configured to control a pressure of the pilot fluid to affect a movement amount of the displacement actuator; anda controller being configured to control the direction and the pressure control valves to adjust a displacement of the primary pump based at least on one of a sensed engine parameter or a mode of operation of the primary pump.2. The hydraulic circuit of claim 1 , wherein the direction control valve is configured to supply the pilot fluid to first end of the displacement actuator while a second end of the displacement actuator is connected to a low pressure sump via the direction control valve.3. The hydraulic circuit of further includes one or more restrictive orifices in a path of a pilot fluid flow between the direction ...

SYSTEM AND METHOD TO CHARGE AND DISCHARGE AN ACCUMULATOR

A method for charging an accumulator is disclosed. The method includes pumping pressurized fluid from an output port of a hydraulic pump to the accumulator to charge the accumulator, and flowing makeup fluid from a hydraulic actuator system to an input port of the hydraulic pump. 1. A method for charging an accumulator , comprising:allowing fluid to flow from an output port of a hydraulic pump, through a closed circuit, to an input port of the hydraulic pump,redirecting fluid from the output port of the hydraulic pump to flow to the accumulator, anddirecting makeup fluid from a hydraulic actuator system to flow to the input port of the hydraulic pump.2. The method of claim 1 , wherein the fluid from a hydraulic actuator system includes fluid exiting a hydraulic actuator.3. The method of claim 1 , further including actuating at least one valve in an accumulator valve configuration to a position to redirect fluid at a first pressure to flow from the output port of the hydraulic pump to the accumulator claim 1 , and directing makeup fluid at a second pressure claim 1 , the second pressure lower than the first pressure claim 1 , to flow from the hydraulic actuator system to the input port of the hydraulic pump.4. The method of claim 1 , further including;allowing fluid to flow from the output port of the hydraulic pump to an input port of a hydraulic motor, through the hydraulic motor, out of an output port of the hydraulic motor, and to the input port of the hydraulic pump,redirecting fluid from the output port of the hydraulic motor to flow to the input port of the hydraulic motor, anddirecting makeup fluid from the hydraulic actuator circuit to flow to the input port of the hydraulic motor.5. The method of claim 4 , further including actuating at least one valve in a makeup valve configuration to a position allowing makeup fluid to flow from the hydraulic actuator circuit to the hydraulic motor.6. The method of claim 4 , further including actuating at least one valve ...

Valve assembly having electrical actuator with balanced stator

A valve assembly for a pump includes an electrical actuator having a stator and an armature. The stator includes an annular outer stator portion and an annular inner stator portion, and an annular channel formed radially between the outer stator portion and the inner stator portion. A first radial channel extending through the annular outer stator portion between an outer surface of the outer stator portion and the annular channel, and at least one second opening in the annular outer stator portion results in magnetic symmetry of the stator . Upon activating the electrical actuator, the attraction of the armature towards the stator is uniform thus displacing fluid between the stator and armature in a uniform manner and to avoid high velocity, potentially damaging fluid flow.

PUMP HAVING PULSATION-REDUCING ENGAGEMENT SURFACE

A pump is disclosed. The pump may have a housing, and a body disposed within the housing and at least partially defining a plurality of barrels. The pump may also have a plurality of plungers associated with the plurality of barrels, and a plunger engagement surface. The plunger engagement surface may have geometry configured to reciprocate the plurality of plungers within the plurality of barrels as the plurality of plungers rotate relative to the plunger engagement surface, and a plurality of undulations configured to reduce a flow pulsation of the pump. 1. A pump , comprising:a housing;a driveshaft extending through the housing along a central axis of the pump;a body disposed within the housing and at least partially defining a plurality of barrels arranged radially about the central axis;a plurality of plungers arranged to reciprocate within the plurality of barrels; anda stroke ring having a plunger engagement surface for engaging the plurality of plungers, the stroke ring positioned on the driveshaft such that rotation of the driveshaft causes the plunger engagement surface to engage the plurality of plungers and thereby reciprocate the plurality of plungers within the plurality of barrels radially about the central axis,wherein the plunger engagement surface comprises a plurality of undulations in the form of crests and troughs that introduce changes the reciprocation of the plurality of plungers within the plurality of barrels as the stroke ring rotates and thereby reduce a flow pulsation of the pump.2. The pump of claim 1 , wherein the plunger engagement surface is formed as part of a swashplate.3. The pump of claim 2 , wherein the plunger engagement surface is integral with the swashplate.4. The pump of claim 2 , wherein the swashplate includes a base claim 2 , and a separate wear plate having the plunger engagement surface.5. (canceled)6. The pump of claim 1 , wherein the number of the crests or a number of the troughs is two times the number of the ...

SYSTEM HAVING COMBINABLE TRANSMISSION AND IMPLEMENT CIRCUITS

A hydraulic system is disclosed for use with a machine. The hydraulic system may have a closed-loop, meterless hydraulic circuit with a first pump fluidly connected to a first actuator. The hydraulic system may also have a closed-loop, metered hydraulic circuit with a second pump fluidly connected to a second actuator. The hydraulic system may further have a combiner valve configured to selectively direct fluid from the closed-loop metered hydraulic circuit to the closed-loop meterless hydraulic circuit. 1. A hydraulic system , comprising;a closed-loop meterless hydraulic circuit having a first pump fluidly connected to a first actuator;a closed-loop metered hydraulic circuit having a second pump fluidly connected to a second actuator; anda combiner valve configured to selectively direct fluid from the closed-loop metered hydraulic circuit to the closed-loop meterless hydraulic circuit.2. The hydraulic system of claim 1 , wherein the closed-loop claim 1 , meterless hydraulic circuit is a hydrostatic transmission circuit.3. The hydraulic system of claim 2 , wherein the closed-loop claim 2 , metered hydraulic circuit is an implement circuit.4. The hydraulic system of claim 1 , further including a controller in communication with the combiner valve claim 1 , wherein claim 1 , during active operation of only the second actuator claim 1 , the controller is configured to close the combiner valve and destroke the first pump.5. The hydraulic system of claim 4 , wherein claim 4 , during active operation of only the first actuator claim 4 , the controller is configured to open the combiner valve and cause both the first and second pumps to provide pressurized flow to the closed-loop claim 4 , meterless hydraulic circuit.6. The hydraulic system of claim 5 , wherein claim 5 , during simultaneous operation of both the first and second actuators claim 5 , the controller is configured to close the combiner valve.7. The hydraulic system of claim 1 , further including:at least one ...

Bearing Arrangement for Cryogenic Pump

A bearing arrangement for a wobble plate piston pump includes first, second, third, and fourth bearing assemblies. The first and second bearing assemblies support the drive shaft portion for rotation within the housing about the central longitudinal axis, while the third and fourth bearing assemblies support the load plate for rotation relative to the offset shaft portion of the shaft. The second bearing assembly is distally disposed from the first, the third disposed distally to second, and the fourth disposed distally to third. The fourth bearing assembly is the most distally disposed bearing assembly along the shaft.

Hydraulic circuit control

A hydraulic circuit is provided. The hydraulic circuit includes a primary pump, a displacement actuator, a charge pump, a direction control valve, and a pressure control valve. The displacement actuator is associated with the primary pump. The charge pump is configured to generate a flow of a pilot fluid. The direction control valve is configured to control the flow of the pilot fluid to the displacement actuator to affect a movement direction of the displacement actuator. The pressure control valve is configured to control a pressure of the pilot fluid to affect a movement amount of the displacement actuator. Further, the hydraulic circuit includes a controller. The controller is configured to control the direction and the pressure control valves to adjust a displacement of the primary pump based at least on one of a sensed engine parameter or a mode of operation of the primary pump.

Check valve seal assembly

A check valve assembly includes a plug having a first end and a second end spaced along a longitudinal axis of the check valve assembly. The check valve assembly also includes a first valve seat, wherein the first end of the plug sealingly contacts the first valve seat. A second valve seat is spaced from the first valve seat in a direction of the longitudinal axis. The check valve assembly further includes a resilient member between the plug and the second valve seat and a spring member urging the resilient member into sealing contact with the second valve seat and the plug.

Regeneration configuration for closed-loop hydraulic systems

A hydraulic system (56) is disclosed. The hydraulic system may have a pump (80), and a hydraulic actuator (26) having a first chamber (52) and a second chamber (54). The hydraulic system may also have a first pump passage (82) fluidly communicating the pump with the first chamber, a second pump passage (84) connected to the pump, and a regeneration valve (110). The regeneration valve may be movable from a first position at which the second pump passage is connected to the second chamber and the second chamber is isolated from the first chamber, to a second position at which the second pump passage is blocked and the second chamber is connected to the first chamber.

Hydraulic fluid system

A hydraulic fluid system (150) for a mobile machine (100) includes a closed loop hydraulic fan circuit (10). The hydraulic fan circuit (10) includes a primary pump (14), a motor (18) fluidly connected to the primary pump (14), and a fan (20) driven by the motor (18). The hydraulic fan circuit (10) also includes a supply passage (26) extending from the primary pump (14) to the motor (18), a return passage (24) extending from the motor (18) to the primary pump (14), and a first accumulator (72) selectively fluidly connected to at least one of the supply (26) and return passages (24) via a charge valve (66). The hydraulic fluid system (150) also includes at least one open loop hydraulic circuit (74) fluidly connected to the first accumulator (72).

Variable delivery control arrangement for a pump

A variable delivery pump is provided for use in a work system. The variable delivery pump includes a variable delivery control arrangement that uses reduced pressure from the variable delivery pump to control the delivery of fluid from the pump. The reduced pressure is directed to a first port of the variable delivery control arrangement and acts to bias the flow changing mechanism to a maximum position when the work system does not require fluid flow. When the work system needs pressurized fluid, the reduced pressure that is also being directed across a flow restrictor is progressively blocked thus causing a variable valve arrangement to controllably direct reduced pressurized fluid to a second fluid port of the flow changing mechanism in opposition to the pressurized fluid at the first fluid port. In the subject arrangement, small orifices requiring large flows is eliminated. Consequently, the subject control arrangement is not adversely subject to high viscosity oils.

Hydraulic pump system with reduced cold start parasitic loss

A machine hydraulic pump system including at least one hydraulic pump driven to pressurize hydraulic fluid. A drain port is in fluid communication with an interior lubricating cavity of the pump. A selectively activatable flow control member is in flow-controlling relation to the drain port. The selectively activatable flow control member is adapted to move from a fluid containment condition to a fluid withdrawal condition prior to activation of the pump to at least partially evacuate lubricating liquid from the interior of the pump in response to the temperature of the lubricating liquid dropping below a predefined lower limit.

Axial piston pump with fluid bearing arrangement

Eine Pumpe weist ein stationäres Pumpengehäuse mit einer mittleren Längsachse und einer Gehäusekammer auf, weiter mit einer sich drehenden Pumpenwelle, die sich durch das Pumpengehäuse und in die Gehäusekammer erstreckt, weiter eine sich drehende Trommel, die an der Pumpenwelle befestigt ist und eine Vielzahl von Pumpenkammern aufweist, und eine Vielzahl von sich drehenden und sich hin- und herbewegenden Pumpenkolben. Jeder Pumpenkolben ist zumindest teilweise in einer jeweiligen Pumpenkammer enthalten. Eine Strömungsmittelliefersteueranordnung ist vorgesehen, um die Menge des Strömungsmittels zu variieren, die von der Pumpe geliefert wird. Mindestens ein unter Druck gesetzter Strömungsmittelspeicher (Pool) ist zwischen einem Teil der sich drehenden Trommel und einem Teil des Pumpengehäuses gelegen. Der unter Druck gesetzte Strömungsmittelspeicher kann entlang einer Endfläche der sich drehenden Trommel und/oder entlang einer Seite der sich drehenden Trommel gelegen sein. A pump has a stationary pump housing with a central longitudinal axis and a housing chamber, further with a rotating pump shaft which extends through the pump housing and into the housing chamber, further a rotating drum which is fixed to the pump shaft and a plurality of pump chambers and a plurality of rotating and reciprocating pump pistons. Each pump piston is at least partially contained in a respective pump chamber. A fluid delivery control arrangement is provided to vary the amount of fluid delivered by the pump. At least one pressurized fluid reservoir (pool) is located between a portion of the rotating drum and a portion of the pump housing. The pressurized fluid reservoir may be located along an end face of the rotating drum and / or along one side of the rotating drum.

Pump having port plate pressure control

A pump is disclosed. The pump may have a housing, a body rotatably disposed within the housing and at least partially defining a plurality of barrels, a plurality of plungers associated with the plurality of barrels, and a swashplate tiltable by a swivel torque to vary a displacement of the plurality of plungers relative to the plurality of barrels. The pump may also have a port plate with an inlet port, a discharge port, and a protrusion. The port plate may be configured to engage an end of the rotatable body. The pump may further have at least one piston disposed within the housing and configured to selectively engage the protrusion of the port plate to rotate the port plate and adjust the swivel torque.

Floating cup pump assembly

A pump assembly with a rotor adapted to rotate around a first axis and supporting outwardly projecting piston elements includes at least one drum plate adapted to rotate around a second axis in angled relation to the first axis. The drum plate supports outwardly projecting cup elements such that the cup elements mateably engage distal portions of corresponding piston elements. A curved surface support element is mounted in sliding relation along a rotatable shaft structure and operatively engages the drum plate. A biasing element urges the curved surface support element and drum plate away from the rotor.

Pump having pulsation-reducing engagement surface

A pump is disclosed. The pump may have a housing, and a body disposed within the housing and at least partially defining a plurality of barrels. The pump may also have a plurality of plungers associated with the plurality of barrels, and a plunger engagement surface. The plunger engagement surface may have geometry configured to reciprocate the plurality of plungers within the plurality of barrels as the plurality of plungers rotate relative to the plunger engagement surface, and a plurality of undulations configured to reduce a flow pulsation of the pump.

Elektrisch angetriebener Aktuator für hydraulische Pumpe

Electrically driven hydraulic pump actuator

A hydraulically-actuated system (10) includes a fix displacement variable delivery pump (18) with a plurality of parallel disposed piston (62) that reciprocate in a pump housing (76) the defines a high pressure portion (64) and a low pressure area (134). A control device (44) is attached to the pump housing (76) and moveable between a first position in which the pistons (62) displace fluid into the high pressure portion (64) and a second position in which pistons (62) spill fluid back to the low pressure area (134). The control device (44) includes an electrically driven linear motion device (66), a linkage (82) and a plurality of sleeves (54), one being disposed on each piston (62). Linear movement of the control device (44) in turn causes linear movement of the sleeves (54). The position of the sleeves (54) in turn determines the amount of output of the pump (1).

Elektrisch angetriebener Aktuator für hydraulische Pumpe

Ventilbaugruppe, einen elektrischen Aktor mit stufigem Anker aufweisend

Eine Ventilbaugruppe (24) für eine Pumpe (10) umfasst einen elektrischen Aktor (30) mit einem Stator (32) und einem Anker (44), wobei der Anker (44) eine dem Stator (32) zugewandte obere Ankeroberfläche (50) mit einem einwärts stufenartig verstärkten Profil (160) aufweist, das an einem radial innen liegenden Ort eine erhabene Oberfläche (58) bildet und an einem radial außen liegenden Ort eine tiefer gelegene spaltbildende Oberfläche (60) bildet, die zwischen dem Anker (44) und dem Stator (32) einen Spalt (70) bildet, wenn der elektrische Aktor (30) betätigt ist, um ein Verdrängen von Fluid zu erleichtern und ein Entstehen von potenziell beschädigenden Fluidströmungen hoher Geschwindigkeit zu vermeiden.

Axial piston pump with outer diameter inlet filling

A variable delivery fixed displacement pump is provided which has a rotating drive plate with a fixed angle. The drive plate has a fill passage extending between its radial outer surface and its drive surface, which allows fluid to be supplied to a fluid journal bearing. The drive plate also has a series of bearing supply passages which fluidly connect the drive surface of the drive plate with a base surface, allowing fluid to be supplied to a fluid thrust bearing. A method of pumping fluid is also provided which is comprised of the steps of reciprocating a plurality of pistons at least in part by rotating the drive plate, and by fluidly connecting a pumping chamber of the pistons to an annular groove that is part of the drive plate fill passage.

Ansauganlage für Axialkolbenpumpe

Elektronisches Trimmen für eine Pumpe mit veränderlicher Förderleistung in einem hydraulischen System für einen Motor

Elektronisch gesteuerte Pumpen mit veränderbarer Förderleistung erzeugen Ausgangsleistungen, die von einem von einem elektronischen Steuermodul erzeugten Steuersignal abhängen. Der elektronische Steuermodul umfasst die Programmierung der Kenntnis, dass jede Pumpe Performance-Charakteristika haben kann, die von einer hypothetischen Nominalpumpe abweichen. Die Performance-Charakteristika einer aktuellen Pumpe werden dann in einen elektronischen Steuermodul programmiert, so dass die Pumpensteuersignale dafür verwendet oder elektronisch abgestimmt oder optimiert werden, um den Performance-Charakteristika der individuellen Pumpe zu entsprechen. Die Performance-Charakteristika der individuellen Pumpe werden durch Tests gewonnen. Die elektronische Pumpentrimm- oder Optimierungsstrategie der vorliegenden Erfindung ist insbesondere bei hydraulischen Systemen, beispielsweise bei Kraftfahrzeugeinspritzsystemen, anwendbar, die bei Verbrennungsmotoren verwendet werden.

Hydraulic fan circuit

A hydraulic fan circuit includes a primary pump, a motor fluidly connected to the primary pump, and a fan operably connected to and driven by the motor. The circuit also includes a supply passage extending from the primary pump to the motor, a return passage extending from the motor to the primary pump, and a pressure limiting valve configured to selectively reduce pressure of a flow of pilot fluid directed to the primary pump. The circuit further includes an override valve configured to selectively connect the supply passage to the pressure limiting valve.

Pump utilizing dissimilar materials to compensate for temperature change

A pump comprises a pump housing that defines an inlet and an outlet. Within the pump housing, there is a barrel that receives at least one reciprocating piston. A sleeve surrounds the annular outer surface of the piston and is movable. The temperature change within the pump is compensated for by comprising at least one of the sleeve and the barrel of a material with a lower coefficient of thermal expansion than the material comprising the piston. A clearance defined by an inner surface of the sleeve and the annular outer surface of the piston increases when the temperature is high and decreases when the temperature is low.

Containerized alternative fuel control unit

An alternative fuel management system may include a base configured for arrangement on a supporting floor or other framework of a vessel and configured to support alternative fuel supply equipment. The system may also include a sealed enclosure sealingly coupled to the base and configured to surround the alternative fuel supply equipment. The system may also include the alternative fuel supply equipment and it may be arranged within the sealed enclosure. The alternative fuel supply equipment may include a high-pressure pump, a fuel filter, a transfer pump, and a high-pressure fuel delivery line extending across the sealed enclosure and configured to provide alternative fuel from the high-pressure pump to a combustion engine. The alternative fuel management system may also include a purge fluid system configured to deliver purge fluid to the combustion engine from a source of purge fluid.