Lightweight engine power cell assembly

Exemplary power cell assemblies and methods of making the same are disclosed. An exemplary power cell assembly may include a piston crown and connecting rod. In an exemplary illustration, a power cell assembly includes a piston crown having a ringland extending circumferentially about a combustion bowl. The boss portions may each include inwardly extending shoulders defining arcuate crown running surfaces. The power cell assembly may further include a connecting rod having a shank and an upper end received in a cavity of the crown. The upper end of the connecting rod may define arcuate connecting rod running surfaces extending away from the shank. The crown running surfaces and connecting rod running surfaces generally allow the connecting rod to pivot with respect to the piston crown about an axis of rotation that extends from one of the boss portions to the other of the boss portions.

LIGHTWEIGHT PISTON PIN FOR PISTON INERTIAL LOADING

An exemplary piston pin for a power cell unit having a piston assembly and a connecting rod may include an elongated body. The elongated body generally may be configured to rotatably secure the piston assembly and the connecting rod in a manner such that no more than approximately an inertial loading generated from an upward movement of the piston assembly is transferred to the elongated body. 1. A piston pin for a power cell unit having a piston assembly and a connecting rod , the piston pin comprising an elongated body configured to rotatably secure the piston assembly and the connecting rod in a manner such that no more than approximately an inertial loading generated from an upward movement of the piston assembly is transferred to the elongated body.2. The piston pin of claim 1 , wherein the elongated body includes a core of a first material and a shell of a second material.3. The piston pin of claim 2 , wherein the first material is aluminum claim 2 , and the second material is steel.4. The piston pin of claim 1 , wherein the material of the elongated body is at least one of steel claim 1 , aluminum claim 1 , ceramic claim 1 , magnesium claim 1 , titanium claim 1 , fiber reinforced composite claim 1 , polymer claim 1 , cast iron claim 1 , and steel.515. The piston pin of claim 1 , wherein the elongated body has a circular cross-section with a diameter of mm or less.6. The piston pin of claim 1 , wherein the elongated body is hollow.7. The piston pin of claim 1 , wherein none of a gas load generated from downward movement of the piston assembly is transferred to the elongated body.8. A piston pin for a power cell unit having a piston assembly and a connecting rod claim 1 , the piston pin comprising an elongated body configured to rotatably secure the piston assembly and the connecting rod claim 1 , the elongated body being configured to withstand an inertial loading during an upward movement of the piston assembly and not a gas load during a downward movement of ...

Piston assembly

A cylinder liner for an internal combustion engine and a method of making the same are disclosed. The cylinder liner may generally include a cylindrical body configured to receive a piston assembly. The cylindrical body may further include a main body portion configured for selective engagement with an engine bore, and an upper flange configured to support the cylindrical body within the engine bore. The cylindrical body may also define an undulating cooling gallery adjacent the upper flange. The undulating cooling gallery generally defines a single coolant flow path extending about a perimeter of the cylindrical body.

Piston assembly with weld support

Exemplary piston assemblies and methods of making the same are disclosed. An exemplary piston may include a piston body defining a piston axis, the piston body having a skirt and forming a lower surface of a cooling gallery. The body may include radially inner and outer body mating surfaces. The piston may further include a cooling gallery ring cooperating with the piston body to form the cooling gallery. The piston body and cooling gallery ring may be joined together along radially inner and radially outer interface regions to form a generally one-piece piston assembly. In some exemplary approaches, mating surfaces of the body and ring may be positioned adjacent a support surface configured to inhibit or prevent weld spatter formed in a process joining the ring and body from the cooling gallery.

LIGHTWEIGHT POWER CELL UNIT

A power cell unit may include a piston assembly having a piston crown and a piston skirt. The piston crown may include a ring belt portion extending circumferentially about a combustion bowl and at least one boss portion extending downward from the combustion bowl. The power cell unit may also include a connecting rod having an elongated portion and a funnel portion, and at least one piston pin configured to connect the connecting rod with the piston assembly. A bottom surface of the at least one boss portion may engage with a corresponding surface of the funnel portion such that a gas load is substantially transferred directly from the piston crown to the connecting rod during downward motion of the piston assembly, and such that only inertial loading from the piston crown and/or piston skirt is transferred to the piston pin during upward motion of the piston assembly. 1. A power cell unit , comprising:a piston assembly having a piston crown and a piston skirt, the piston crown including a ring belt portion extending circumferentially about a combustion bowl and at least one boss portion extending downward from the combustion bowl;a connecting rod having an elongated portion and a funnel portion at one end of the elongated portion; andat least one piston pin configured to connect the connecting rod with the piston assembly;wherein a bottom surface of the at least one boss portion of the piston crown engages with a corresponding surface of the funnel portion of the connecting rod such that a gas load is substantially transferred directly from the piston crown to the connecting rod during downward movement of the piston assembly.2. The power cell unit of claim 1 , wherein 100% of the gas load is transferred directly from the piston crown to the connecting rod during downward movement of the piston assembly.3. The power cell unit of claim 1 , wherein the piston skirt cooperates with the piston crown to define a cooling gallery between the ring belt portion and the ...

Thermal spray coating for connecting rod small end

A connecting rod having a small end and a large end, the small end including a pin bore defined by a pin bore surface. A thermal spray coating applied to at least a portion of the pin bore surface and a method of applying the thermal spray coating to the pin bore surface using a thermal spray technique.

Steel piston with fourth land guidance and improved friction characteristics

Steel pistons used in many internal combustion engines are generally composed of a skirt and a crown. The skirt's function is to reduce the lateral and rotational movement of the piston in the cylinder while the engine is in operation. Lateral and rotational frictional forces imparted to a piston during engine operation cause the piston to scrape off the lubricating oil film present on the cylinder wall. The reduced oil film thickness increases piston and cylinder wall wear due to metal to metal contact. The subsequent metal to metal contact produces a phenomenon called scuffing. This disclosure incorporates several design modifications to the piston and results in a significant reduction of the lateral and rotational motion of the piston during engine operation. The reduction of piston motion reduces the amount of oil film removed from the cylinder wall and increases lubrication efficiency. The Increased lubrication efficiency realized reduces frictional wear power loss and scuffing.

Piston for an internal combustion engine, and method for the production thereof

The invention relates to a piston (10) for an internal combustion engine, comprising a piston head (10a), a piston skirt (15), and a circumferential recess (25) formed between the piston head (10a) and the piston skirt (15). The invention is characterized in that: - the piston (10) has a basic piston body (11) and a piston ring element (12); - the basic piston body (11) includes at least one bottom zone (19a) of a combustion recess (19) as well as the piston skirt (15); - the piston ring element (12) includes at least one piston crown (21), a wall region (19b) of the combustion recess (19), a circumferential top land (22), and a circumferential ring part (23) provided with annular grooves; - the piston ring element (12) has a circumferential cooling duct (27) between the wall region (19b) of the combustion recess (19) and the ring part (23), said cooling duct (27) being sealed by a sealing element (26); - in the area of the combustion recess (19), the basic piston body (11) and the piston ...

Connecting rod bore

A linking arm (36) conveying generally linear movement from a piston (30) into generally radial movement of a crankshaft (50) is disclosed. The linking arm includes a shaft (54) extending between a piston pin end (52) and a crankshaft pin end (50). The piston pin end (52) defines a piston pin bore (66). A piston pin bore surface (68) is defined by the piston pin bore (66), where the piston pin bore (66) includes a non-circular transverse profile (70) having at least two curved surfaces (72, 74) that each include a distinct radius, where the at least two curved surfaces are positioned in different locations around a periphery of the transverse profile (70).

Welded piston assembly

A pre-finished piston part is disclosed that may be used to form a piston assembly. A pre-finished piston may include a lower part defining a piston axis, the lower part having a skirt and forming a lower surface of a cooling gallery. The lower part may include a radially inner bowl surface defining a lower part radially inner mating surface. The pre-finished piston assembly may further include an upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint. The upper part may include a radially inner wall defining a radially inner upper part mating surface. The radially inner wall may define a radially inwardly facing surface that defines a non-parallel angle with the radially inner bowl surface where the radially inner bowl surface meets the radially innermost edge of the radially inner mating surface.

Piston assembly

Exemplary piston assemblies and methods of making the same are disclosed. An exemplary piston assembly may include a piston crown and a piston skirt that is received in a central opening of the crown. The piston crown may include a ring belt portion defining, at least in part, a cooling gallery. The crown and skirt may each further include corresponding mating surfaces that extend about a periphery of the crown and skirt. The skirt mating surface and crown mating surface may generally be secured to each other that the crown and the skirt cooperate to form a continuous upper combustion bowl surface. The skirt and crown may cooperate to define a radially outer gap about a periphery of the piston crown.

Piston assembly

Exemplary piston assemblies and methods of making the same are disclosed. An exemplary piston assembly may include a piston crown and a piston skirt that is received in a central opening of the crown. The piston crown may include a ring belt portion defining, at least in part, a cooling gallery. The crown and skirt may each further include corresponding mating surfaces that extend about a periphery of the crown and skirt. The skirt mating surface and crown mating surface may generally be secured to each other that the crown and the skirt cooperate to form a continuous upper combustion bowl surface. The skirt and crown may cooperate to define a radially outer gap about a periphery of the piston crown.

Piston assembly

Exemplary piston assemblies and methods of making the same are disclosed. An exemplary piston assembly may include a piston crown and a piston skirt that is received in a central opening of the crown. The piston crown may include a ring belt portion defining, at least in part, a cooling gallery. The crown and skirt may each further include corresponding mating surfaces that extend about a periphery of the crown and skirt. The skirt mating surface and crown mating surface may generally be secured to each other that the crown and the skirt cooperate to form a continuous upper combustion bowl surface. The skirt and crown may cooperate to define a radially outer gap about a periphery of the piston crown.

Piston for an internal combustion engine and method for its production

A piston for an internal combustion engine has a piston head, a piston skirt, and a circumferential recess configured between the piston head and the piston skirt. The piston has a piston base body and a piston ring element. The piston base body has a crown region of a combustion bowl and the piston skirt. The piston ring element has a piston crown, a wall region of the combustion bowl, a circumferential top land, and a circumferential ring belt with ring grooves. The piston ring element has a circumferential cooling channel between the wall region of the combustion bowl and the ring belt, closed with a closure element. The piston base body and the piston ring element have a circumferential joining seam in the region of the combustion bowl, by way of which seam they are non-releasably connected with one another. 1101015251015aa. Piston () for an internal combustion engine , having a piston head () , a piston skirt () , and a circumferential recess () configured between the piston head () and the piston skirt () ,wherein{'b': 10', '11', '12, 'the piston () has a piston base body () and a piston ring element (),'}{'b': 11', '19', '19', '15, 'i': 'a', 'the piston base body () has at least a crown region () of a combustion bowl () as well as the piston skirt (),'}{'b': 12', '21', '19', '19', '22', '23, 'i': 'b', 'the piston ring element () has at least a piston crown (), a wall region () of the combustion bowl (), a circumferential top land (), and a circumferential ring belt () provided with ring grooves,'}{'b': 12', '27', '19', '19', '23', '26, 'i': 'b', 'the piston ring element () has a circumferential cooling channel () between the wall region () of the combustion bowl () and the ring belt (), closed with a closure element (),'}{'b': 11', '12', '28', '19, 'the piston base body () and the piston ring element () have a circumferential joining seam () in the region of the combustion bowl (), in each instance, by way of which seam they are non-releasably connected with ...

THERMAL SPRAY COATING FOR CONNECTING ROD SMALL END

A connecting rod having a small end and a large end, the small end including a pin bore defined by a pin bore surface. A thermal spray coating applied to at least a portion of the pin bore surface and a method of applying the thermal spray coating to the pin bore surface using a thermal spray technique. 1. A connecting rod comprising:a small end having a piston pin bore disposed therein, the piston pin bore defined by a piston pin bore surface having a first portion and a second portion forming an entire circumference of the piston pin bore;a large end having a crankshaft pin bore disposed therein, the crankshaft pin bore defined by a crankshaft surface, the crankshaft pin bore being larger than the piston pin bore; anda thermal spray coating applied to the first portion of the pin bore surface such that the second portion of the pin bore surface is uncoated.2. The connecting rod of claim 1 , wherein the first portion of the pin bore surface is recessed with respect to the second portion of the pin bore surface by a recess distance.3. The connecting rod of claim 2 , wherein the thermal spray coating defines a coating thickness claim 2 , the coating thickness substantially equal to the recess distance of the second portion of the pin bore surface.4. The connecting rod of claim 2 , wherein edges of the thermal spray coating at opposing ends of the first portion of the pin bore surface are substantially flush with corresponding edges of the second portion of the pin bore surface.5. The connecting rod of claim 2 , wherein opposing ends of the first portion of the pin bore surface each terminate at a recess transition claim 2 , the recess transitions each leading from the first portion of the pin bore surface to the second portion of the pin bore surface claim 2 , the recess transitions each defining an oblique angle with respect to the adjacent first and second pin bore surfaces.6. The connecting rod of claim 2 , wherein opposing ends of the first portion of the pin ...

CONNECTING ROD LUBRICATION RECESS

Exemplary connecting rods and methods of making a connecting rod are disclosed. A method of making a connecting rod may include the step of providing a connecting rod blank, where the connecting rod blank includes a crankshaft end and a piston pin end. The method may further include forming a crankshaft pin recess in the crankshaft end of the connecting rod blank and a piston pin recess in the piston pin end, and forming at least one lubrication recess in the piston pin end of the connecting rod blank. The lubrication recess and the piston pin recess may both formed concurrently. 1. A method of manufacturing a connecting rod , comprising:providing a connecting rod blank, where the connecting rod blank includes a crankshaft end and a piston pin end; andforming a crankshaft pin recess in the crankshaft end of the connecting rod blank, a piston pin recess in the piston pin end, and at least one lubrication recess in the piston pin end of the connecting rod blank; andwherein the lubrication recess and the piston pin recess are both formed concurrently.2. The method as recited in claim 1 , the at least one lubrication recess including an outer profile having a final predetermined configuration claim 1 , and substantially defining the predetermined final configuration of the outer profile of the at least one lubrication recess by the forming of the piston pin recess step.3. The method as recited in claim 1 , further comprising a generally circular depression within the piston pin recess claim 1 , the depression defining one of the at least one lubrication recesses and forming at least a portion of the outer profile of the lubrication recess.4. The method as recited in claim 1 , further comprising:removing a piston pin material flash and a crankpin material flash from the piston pin recess and the crankpin recess, thereby creating a piston pin bore and a crankpin bore.5. The method as recited in claim 4 , wherein removing the piston pin flash and the crankshaft pin flash ...

PISTON FOR AN INTERNAL COMBUSTION ENGINE

Exemplary pistons are disclosed, e.g., for an internal combustion engine. An exemplary piston includes a lower part and an upper part, whereby the lower part and the upper part define a circumferential closed cooling gallery. The cooling gallery may be provided with a gallery bottom. The piston may further include a circumferential bar positioned on the gallery bottom, the circumferential bar defining at least one coolant inlet and at least one coolant outlet extending through the bar. 1. A piston for an internal combustion engine , comprisinga lower part;an upper part, wherein the lower part and the upper part cooperate to define at least a portion of a generally closed circumferential cooling gallery, the cooling gallery being defined in part by a gallery bottom; anda circumferential bar positioned on the gallery bottom, the circumferential bar defining at least one coolant inlet and at least one coolant outlet extending through the gallery bottom.2. The piston according to claim 1 , wherein the bar is formed integrally with the gallery bottom.3. The piston according to claim 1 , wherein the bar is formed as a separate part which is connected with the gallery bottom.4. The piston according to claim 1 , wherein the bar is positioned on the gallery bottom off-center with respect to a width of the gallery bottom.5. The piston according to claim 1 , wherein the bar is offset radially outwards with respect to a central axis of the piston.6. The piston according to claim 1 , wherein a first diameter of at least one coolant inlet is smaller than a second diameter of at least one coolant outlet.7. The piston according to claim 1 , wherein a single coolant inlet and a single coolant outlet are provided.8. The piston according to claim 7 , wherein the single coolant inlet and single coolant outlet are positioned diametrically opposite each other.9. The piston according to claim 1 , wherein the circumferential bar extends about substantially an entire periphery of the piston ...

LIGHTWEIGHT ENGINE POWER CELL ASSEMBLY

Exemplary power cell assemblies and methods of making the same are disclosed. An exemplary power cell assembly may include a piston crown and connecting rod. In an exemplary illustration, a power cell assembly includes a piston crown having a ringland extending circumferentially about a combustion bowl. The boss portions may each include inwardly extending shoulders defining arcuate crown running surfaces. The power cell assembly may further include a connecting rod having a shank and an upper end received in a cavity of the crown. The upper end of the connecting rod may define arcuate connecting rod running surfaces extending away from the shank. The crown running surfaces and connecting rod running surfaces generally allow the connecting rod to pivot with respect to the piston crown about an axis of rotation that extends from one of the boss portions to the other of the boss portions. 1. A power cell assembly , comprising:a piston crown, including a ringland extending circumferentially about a combustion bowl, and two boss portions extending downward from the combustion bowl to define a cavity therebetween, the boss portions each including inwardly extending shoulders defining arcuate crown running surfaces; anda connecting rod having a shank and an upper end received in the cavity, the upper end defining arcuate connecting rod running surfaces extending away from the shank, the arcuate running surfaces positioned to mate with the crown running surfaces, thereby allowing the connecting rod to pivot with respect to the piston crown about an axis of rotation extending from one of the boss portions to the other of the boss portions.2. The power cell assembly of claim 1 , further comprising a piston skirt extending downward from the outer ringland of the crown.3. The power cell assembly of claim 2 , wherein the skirt includes an upper shoulder cooperating with the piston crown to define a cooling gallery.4. The power cell assembly of claim 3 , wherein the upper ...

THERMAL SPRAY COATING FOR CONNECTING ROD SMALL END

A connecting rod having a small end and a large end, the small end including a pin bore defined by a pin bore surface. A thermal spray coating applied to at least a portion of the pin bore surface and a method of applying the thermal spray coating to the pin bore surface using a thermal spray technique. 1. A method , comprising:providing a connecting rod having a piston pin end, a crankshaft pin end, and a beam extending therebetween;forming a piston pin bore in the piston pin end, including forming a piston pin bore surface having a first portion and a second portion forming an entire circumference of the piston pin bore, wherein the first portion of the pin bore surface is recessed with respect to the second portion of the pin bore surface by a recess distance;forming a crankshaft pin bore in the crankshaft pin end, the crankshaft pin bore defined by a crankshaft surface, the crankshaft pin bore being larger than the piston pin bore; andapplying a thermal spray coating to the first portion of the pin bore surface such that the second portion of the pin bore surface is uncoated.2. The method of claim 1 , further comprising forming edges of the thermal spray coating at opposing ends of the first portion of the pin bore surface substantially flush with corresponding edges of the second portion of the pin bore surface.3. The method of claim 1 , wherein applying the thermal spray coating includes applying an excess amount of coating material along opposing edges of the thermal spray coating.4. The method of claim 2 , further comprising machining the at least one edge of the thermal spray coating claim 2 , including the removing the excess amount of the coating material such that an adjacent component of the uncoated second portion of the pin bore surface is machined generally simultaneously with the machining of the thermally sprayed coating material claim 2 , thereby forming the first portion of the pin bore surface substantially flush with the corresponding edges of ...

STEEL PISTON WITH FOURTH LAND GUIDANCE AND IMPROVED FRICTION CHARACTERISTICS

Steel pistons used in many internal combustion engines are generally composed of a skirt and a crown. The skirt's function is to reduce the lateral and rotational movement of the piston in the cylinder while the engine is in operation. Lateral and rotational frictional forces imparted to a piston during engine operation cause the piston to scrape off the lubricating oil film present on the cylinder wall. The reduced oil film thickness increases piston and cylinder wall wear due to metal to metal contact. The subsequent metal to metal contact produces a phenomenon called scuffing. This disclosure incorporates several design modifications to the piston and results in a significant reduction of the lateral and rotational motion of the piston during engine operation. The reduction of piston motion reduces the amount of oil film removed from the cylinder wall and increases lubrication efficiency. The Increased lubrication efficiency realized reduces frictional wear power loss and scuffing. 1. A piston , comprising:a crown including a plurality of lands separated by a groove defined between adjacent lands; anda skirt secured to the crown;wherein the plurality of lands includes a first land having a first axial extent, a second land having a second axial extent positioned between the first land and a third land, the third land having a third axial extent, and a fourth land having a fourth axial extent positioned away from a region of combustion in relation to the first and second land, and wherein the fourth land has a greater axial extent than the second land.2. The piston of claim 1 , wherein the fourth land is the bottom land of the crown.3. The piston of claim 1 , wherein the first land is the uppermost land of the crown.4. The piston of claim 3 , wherein the fourth land has a greater axial extent than the second land.5. The piston of claim 1 , wherein the fourth land has an axial extent of approximately 2 to 17 percent of a diameter of the piston crown.6. The piston ...

WELDED PISTON ASSEMBLY

A pre-finished piston part is disclosed that may be used to form a piston assembly. A pre-finished piston may include a lower part defining a piston axis, the lower part having a skirt and forming a lower surface of a cooling gallery. The lower part may include a radially inner bowl surface defining a lower part radially inner mating surface. The pre-finished piston assembly may further include an upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint. The upper part may include a radially inner wall defining a radially inner upper part mating surface. The radially inner wall may define a radially inwardly facing surface that defines a non-parallel angle with the radially inner bowl surface where the radially inner bowl surface meets the radially innermost edge of the radially inner mating surface. 124-. (canceled)25. A pre-finished assembly for making a piston , comprising:a lower part defining a longitudinal axis, the lower part having a skirt and forming a lower surface of a cooling gallery, the lower part having a radially inner bowl surface defining a lower part radially inner mating surface, the radially inner bowl surface extending from a radially innermost edge of the radially inner mating surface toward a center portion of the assembly, the lower part including a radially outer wall defining a radially outer mating surface; andan upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint, the upper part including a radially inner wall defining a lower surface extending radially to define an upper part radially inner mating surface, the radially inner wall defining a radially inwardly facing surface leading upwardly away from the upper part radially inner mating surface, the upper part including a radially outer wall defining an upper part radially outer mating surface;wherein the upper part radially inner mating surface and the radially inner ...

PISTON ASSEMBLY WITH WELD SUPPORT

Exemplary piston assemblies and methods of making the same are disclosed. An exemplary piston may include a piston body defining a piston axis, the piston body having a skirt and forming a lower surface of a cooling gallery. The body may include radially inner and outer body mating surfaces. The piston may further include a cooling gallery ring cooperating with the piston body to form the cooling gallery. The piston body and cooling gallery ring may be joined together along radially inner and radially outer interface regions to form a generally one-piece piston assembly. In some exemplary approaches, mating surfaces of the body and ring may be positioned adjacent a support surface configured to inhibit or prevent weld spatter formed in a process joining the ring and body from the cooling gallery. 1. A method , comprising:providing a piston body defining a piston axis and at least a portion of an upper combustion bowl surface, the piston body forming a lower surface of a cooling gallery, the body including radially inner and outer body mating surfaces;assembling a cooling gallery ring with the piston body, the cooling gallery ring including a radially inner ring mating surface and a radially outer ring mating surface;laser welding the body to the cooling gallery ring along a radially inner interface region, the radially inner interface region including the radially inner mating surfaces of the body and the cooling gallery ring; andlaser welding the body to the cooling gallery ring along a radially outer interface region, the radially outer interface region including the radially outer mating surfaces of the body and cooling gallery ring;wherein at least one of the mating surfaces includes a step portion supporting an adjacent interface region between the cooling gallery ring and the piston body.2. The method of claim 1 , wherein the laser welding includes directing a weld laser substantially parallel to the piston axis toward one of the radially inner and radially ...

WELDED PISTON ASSEMBLY

A pre-finished piston part is disclosed that may be used to form a piston assembly. A pre-finished piston may include a lower part defining a piston axis, the lower part having a skirt and forming a lower surface of a cooling gallery. The lower part may include a radially inner bowl surface defining a lower part radially inner mating surface. The pre-finished piston assembly may further include an upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint. The upper part may include a radially inner wall defining a radially inner upper part mating surface. The radially inner wall may define a radially inwardly facing surface that defines a non-parallel angle with the radially inner bowl surface where the radially inner bowl surface meets the radially innermost edge of the radially inner mating surface. 1. A pre-finished assembly for making a piston , comprising:a lower part defining a longitudinal axis, the lower part having a skirt and forming a lower surface of a cooling gallery, the lower part having a radially inner bowl surface defining a lower part radially inner mating surface, the radially inner bowl surface extending from a radially innermost edge of the radially inner mating surface toward a center portion of the assembly, the lower part including a radially outer wall defining a radially outer mating surface; andan upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint, the upper part including a radially inner wall defining a lower surface extending radially to define an upper part radially inner mating surface, the radially inner wall defining a radially inwardly facing surface leading upwardly away from the upper part radially inner mating surface, the upper part including a radially outer wall defining an upper part radially outer mating surface;wherein the radially inwardly facing surface of the upper part defines a non-parallel angle ...

PISTON FOR AN INTERNAL COMBUSTION ENGINE AND METHOD FOR ITS PRODUCTION

A method for the production of a piston for an internal combustion engine, having a piston head, a piston skirt, and a circumferential recess configured between the piston head and the piston skirt. The piston has a piston base body and a piston ring element. The piston base body has at least a crown region of a combustion bowl as well as the piston skirt. The piston ring element has at least a piston crown, a wall region of the combustion bowl, a circumferential top land, and a circumferential ring belt with ring grooves. The piston ring element has a circumferential cooling channel between the wall region of the combustion bowl and the ring belt, closed with a closure element. The piston base body and the piston ring element are connected by a circumferential joining seam in the region of the combustion bowl. 1. A method for the production of a piston for an internal combustion engine , the piston having a piston base body and a piston ring element and a ring-shaped recess configured between a piston head and a piston skirt , the method comprising the following steps:(a) making available a blank of a piston base body that has at least a crown region of a combustion bowl, the piston skirt, as well as a joining surface in a region of the combustion bowl;(b) making available a blank of a piston ring element that has at least a piston crown, a wall region of a combustion bowl, a circumferential recess, as well as a joining surface in the region of the combustion bowl;(c) connecting the blank of the piston base body with the blank of the piston ring element by way of their joining surfaces, to produce a piston blank; and(d) reworking or finishing the piston blank to produce the piston.2. The method according to claim 1 , wherein subsequent to step (b) or subsequent to step (c) claim 1 , the recess is closed by a closure element claim 1 , so that a circumferential cooling channel is formed.3. The method according to claim 2 , wherein subsequent to step (b) claim 2 , the ...

Method and apparatus for determining cooling gallery fill in a piston

A system includes an engine block having a plurality of cylinder-piston combinations. At least one of the cylinder-piston combinations includes a cylinder, a piston positioned in the cylinder and coupled to a connecting rod, the piston having an internal cooling gallery about a circumference of the piston, an oil jet for introducing coolant into the cooling gallery, and at least one pressure sensor positioned within the piston to detect pressure fluctuations within the cooling gallery. The system includes a processor having a program coupled thereto. The processor is configured to detect cyclical pressure fluctuations within the cooling gallery, via the at least one pressure sensor, during a linear motion of the piston within the engine block, determine pressures that occur during the detected cyclical pressure fluctuations, and determine a fill ratio of coolant within the cooling gallery based on the determined pressures.

Piston crown cooling gallery insert

An internal combustion engine piston includes a crown including a ring belt portion including an outer wall and ring grooves, wherein the outer wall has a first end, a combustion bowl including an inner wall having a second end, a top wall extending between the inner and outer walls, and an annular cavity between the inner and outer walls, including an opening opposite the top wall, and at least partially defining a cooling gallery. At least one insert protrudes into the cooling gallery so as to axially overlap the ring grooves to direct coolant to desired portions of the crown.

Piston assembly

Exemplary piston assemblies and methods of making the same are disclosed. An exemplary piston assembly may include a piston crown and a piston skirt that is received in a central opening of the crown. The piston crown may include a ring belt portion defining, at least in part, a cooling gallery. The crown and skirt may each further include corresponding mating surfaces that extend about a periphery of the crown and skirt. The skirt mating surface and crown mating surface may generally be secured to each other that the crown and the skirt cooperate to form a continuous upper combustion bowl surface. The skirt and crown may cooperate to define a radially outer gap about a periphery of the piston crown.

Piston with a cooling gallery

A piston for an internal combustion engine is provided. The piston crown includes an interior surface that defines at least in part a cooling gallery and a cooling gallery surface within the piston. An annular surface may defines at least in part an annular passageway that allows fluid communication between an outer surface of the piston and the cooling gallery. Opposing annular surfaces may be abutted with a predetermined force, thereby limiting fluid flow from the cooling gallery to an outer surface of the piston. Further, an annular surface may extend into the cooling gallery to form a deflector along the cooling gallery surface, thereby limiting fluid flow from the cooling gallery to an outer surface of the piston.

Method of forming a connecting rod from two dissimiliar materials by providing material blanks of dissimiliar material, joining the material blanks and subsequently forming the connecting rod

A connecting rod and methods for making the same are disclosed. A method of making a connecting rod may include joining a first connecting rod blank and a second connecting rod blank together. The first connecting rod blank includes a first material, while the second connecting rod blank includes a second material different from the first material. The first and second connecting rod blanks have an interface between the piston pin and crankshaft ends. The method further includes narrowing a cross-section of the blanks at the interface, forming a piston pin aperture in the first connecting rod blank, and forming a crankshaft pin aperture in the second connecting rod blank. At least one of the narrowing and forming steps works a perimeter of the interface, thereby forming a generally smooth connecting rod surface about the perimeter of the interface.

Piston for an internal combustion engine, and method for the production thereof

The invention relates to a piston (10) for an internal combustion engine, comprising a piston head (10a), a piston skirt (15), and a circumferential recess (25) formed between the piston head (10a) and the piston skirt (15). The invention is characterized in that: - the piston (10) has a basic piston body (11) and a piston ring element (12); - the basic piston body (11) includes at least one bottom zone (19a) of a combustion recess (19) as well as the piston skirt (15); - the piston ring element (12) includes at least one piston crown (21), a wall region (19b) of the combustion recess (19), a circumferential top land (22), and a circumferential ring part (23) provided with annular grooves; - the piston ring element (12) has a circumferential cooling duct (27) between the wall region (19b) of the combustion recess (19) and the ring part (23), said cooling duct (27) being sealed by a sealing element (26); - in the area of the combustion recess (19), the basic piston body (11) and the piston ring element (12) each have a circumferential seam (28), by means of which the two are permanently joined together. The invention further relates to a method for producing such a piston.

Piston assembly

Exemplary piston assemblies and methods of making the same are disclosed. An exemplary piston assembly may include a piston crown and a piston skirt that is received in a central opening of the crown. The piston crown may include a ring belt portion defining, at least in part, a cooling gallery. The crown and skirt may each further include corresponding mating surfaces that extend about a periphery of the crown and skirt. The skirt mating surface and crown mating surface may generally be secured to each other that the crown and the skirt cooperate to form a continuous upper combustion bowl surface. The skirt and crown may cooperate to define a radially outer gap about a periphery of the piston crown.

Multi-part piston for a combustion engine

A multi-part piston for a combustion engine having a piston upper part and a piston lower part, where the piston upper part has a piston crown and an attachment head on its side facing the piston lower part, and the piston lower part has an attachment element in which the attachment head is held, the attachment element being disposed on a side facing the piston upper part. The attachment head is held in the attachment element by a press fit.

Steel piston with fourth land guidance and improved friction characteristics

Steel pistons used in many internal combustion engines are generally composed of a skirt and a crown. The skirt's function is to reduce the lateral and rotational movement of the piston in the cylinder while the engine is in operation. Lateral and rotational frictional forces imparted to a piston during engine operation cause the piston to scrape off the lubricating oil film present on the cylinder wall. The reduced oil film thickness increases piston and cylinder wall wear due to metal to metal contact. The subsequent metal to metal contact produces a phenomenon called scuffing. This disclosure incorporates several design modifications to the piston and results in a significant reduction of the lateral and rotational motion of the piston during engine operation. The reduction of piston motion reduces the amount of oil film removed from the cylinder wall and increases lubrication efficiency. The increased lubrication efficiency realized reduces frictional wear power loss and scuffing.

Cooling channel cover for a one-piece piston of an internal combustion engine

A cooling channel cover for a one-piece piston of an internal combustion engine, the piston having a closed cooling channel that runs around inside the piston crown and a ring-shaped recess between the piston ring band and the piston shaft. There is an easy to assemble cooling channel cover comprising a one-piece plastic ring that is U-shaped in cross-section, having a ring bottom and an outer shank around the circumference, molded onto the ring bottom and angled off radially to the outside, and an inner shank around the circumference, angled off radially to the inside. There is a fist radial division having a mouth width (M) and a second radial division forming a first film hinge for radial deflection of one of the ring shanks and a second film hinge that permits at least one radial deflection of at least one of the radially angled shanks. In order to close off the cooling channel, the shanks engage in a stepped conical recess of on an inner circumferential edge of the cooling channel.

Steel piston with fourth land guidance and improved friction characteristics

Steel pistons used in many internal combustion engines are generally composed of a skirt and a crown. The skirt's function is to reduce the lateral and rotational movement of the piston in the cylinder while the engine is in operation. Lateral and rotational frictional forces imparted to a piston during engine operation cause the piston to scrape off the lubricating oil film present on the cylinder wall. The reduced oil film thickness increases piston and cylinder wall wear due to metal to metal contact. The subsequent metal to metal contact produces a phenomenon called scuffing. This disclosure incorporates several design modifications to the piston and results in a significant reduction of the lateral and rotational motion of the piston during engine operation. The reduction of piston motion reduces the amount of oil film removed from the cylinder wall and increases lubrication efficiency. The increased lubrication efficiency realized reduces frictional wear power loss and scuffing.

Connecting rod bore

A linking arm conveying generally linear movement from a piston into generally radial movement of a crankshaft is disclosed. The linking arm includes a shaft extending between a piston pin end and a crankshaft pin end. The piston pin end defines a piston pin bore. A piston pin bore surface is defined by the piston pin bore, where the piston pin bore includes a non-circular transverse profile having at least two curved surfaces that each include a distinct radius, where the at least two curved surfaces are positioned in different locations around a periphery of the transverse profile.

Cooling channel cover for a one-piece piston of an internal combustion engine

A cooling channel cover for a one-piece piston of an internal combustion engine, the piston having a closed cooling channel that runs around inside the piston crown, at the level of the piston ring band, and a ring-shaped recess provided between the piston ring band and the piston shaft, wherein the piston shaft is connected with the piston hubs suspended on the piston crown. In such a piston, an easy to assemble cooling channel cover is achieved by means of a one-piece plastic/spring steel ring that is U-shaped in cross-section.

Piston crown cooling gallery insert

An internal combustion engine piston includes a crown including a ring belt portion including an outer wall and ring grooves, wherein the outer wall has a first end, a combustion bowl including an inner wall having a second end, a top wall extending between the inner and outer walls, and an annular cavity between the inner and outer walls, including an opening opposite the top wall, and at least partially defining a cooling gallery. At least one insert protrudes into the cooling gallery so as to axially overlap the ring grooves to direct coolant to desired portions of the crown.

Cooling channel cover for a one-piece piston of an internal combustion engine

A cooling channel cover for a one-piece piston of an internal combustion engine, the piston having a closed cooling channel that runs around inside the piston crown, at the level of the piston ring band, and a ring-shaped recess provided between the piston ring band and the piston shaft. The piston shaft is connected with the piston hubs suspended on the piston crown. In such a piston, an easy to assemble cooling channel cover is achieved by a one-piece plastic ring that is U-shaped in cross-section, having a ring bottom and an outer shank around the circumference, molded onto the ring bottom and angled off radially to the outside, and an inner shank around the circumference, angled off radially to the inside. The plastic ring has a first radial division having a mouth width and a second radial division, opposite the first division, which does not separate the radially angled outer shank that runs around the circumference, to form a film hinge for radial deflection of a ring shank formed by the film hinge.

Piston assembly

piston set.

conjunto de pistão. camisa de cilindro para um motor de combustão interna e um método de fabricação da mesma são divulgadas. a camisa de cilindro pode incluir, em geral, um corpo cilíndrico configurado para receber um conjunto de pistão. o corpo cilíndrico pode ainda incluir uma porção de corpo principal configurada para encaixe seletivo com um diâmetro do cilindro e um flange superior configurado para encaixe seletivo com um diâmetro de cilindro e um flange superior configurado para suportar o corpo cilíndrico dentro do furo motor. o corpo cilíndrico também pode definir uma galeria de resfriamento ondulatória, adjacente aoflange superior, a galeria de resfriamento ondulatória, de um modo geral, define um curso único de fluxo de refrigerante que se estende em torno de um perímetro do corpo cilíndrico. piston set. cylinder liner for an internal combustion engine and a method of manufacturing it are disclosed. The cylinder liner may generally include a cylindrical body configured to receive a piston assembly. the cylindrical body may further include a main body portion configured for selective engagement with a cylinder diameter and an upper flange configured for selective engagement with a cylinder diameter and an upper flange configured to support the cylindrical body within the drive bore. The cylindrical body may also define an undulating cooling gallery adjacent the upper flange, the undulating cooling gallery generally defines a single refrigerant flow path extending around a perimeter of the cylindrical body.

Piston assembly

A cylinder liner for an internal combustion engine and a method of making the same are disclosed. The cylinder liner may generally include a cylindrical body configured to receive a piston assembly. The cylindrical body may further include a main body portion configured for selective engagement with an engine bore, and an upper flange configured to support the cylindrical body within the engine bore. The cylindrical body may also define an undulating cooling gallery adjacent the upper flange. The undulating cooling gallery generally defines a single coolant flow path extending about a perimeter of the cylindrical body.

Piston assembly

A cylinder liner for an internal combustion engine and a method of making the same are disclosed. The cylinder liner may generally include a cylindrical body configured to receive a piston assembly. The cylindrical body may further include a main body portion configured for selective engagement with an engine bore, and an upper flange configured to support the cylindrical body within the engine bore. The cylindrical body may also define an undulating cooling gallery adjacent the upper flange. The undulating cooling gallery generally defines a single coolant flow path extending about a perimeter of the cylindrical body.

Thermal spray coating for connecting rod small end

A connecting rod having a small end and a large end, the small end including a pin bore defined by a pin bore surface. A thermal spray coating applied to at least a portion of the pin bore surface and a method of applying the thermal spray coating to the pin bore surface using a thermal spray technique.

haste de conexão

haste de conexão. a presente invenção refere-se a uma haste de conexão tendo uma extremidade pequena e uma extremidade grande, a extremidade pequena incluindo um furo para pino definido por uma superfície de furo para pino. um revestimento por pulverização térmica aplicado a pelo menos uma parte da superfície de furo para pino e um método de aplicar o revestimento por pulverização térmica à superfície de furo para pino usando uma técnica de pulverização térmica.

Thermal spray coating for connecting rod small end

A connecting rod having a small end and a large end, the small end including a pin bore defined by a pin bore surface. A thermal spray coating applied to at least a portion of the pin bore surface and a method of applying the thermal spray coating to the pin bore surface using a thermal spray technique.

Piston for an internal combustion engine

Exemplary pistons are disclosed, e.g., for an internal combustion engine. An exemplary piston includes a lower part and an upper part, whereby the lower part and the upper part define a circumferential closed cooling gallery. The cooling gallery may be provided with a gallery bottom. The piston may further include a circumferential bar positioned on the gallery bottom, the circumferential bar defining at least one coolant inlet and at least one coolant outlet extending through the bar.