Abstract: In a cryogenic workbench, a cryogenic laser peening system and a control method, a tapered surface gap d is adjusted, based on the electromagnetic principle, to control the gasification volume of liquid nitrogen, then the temperatures of the copious cooling workbench and the surface of a sample are precisely controlled by means of the adjustment of the heat absorption amount of liquid nitrogen gasification, the temperature adjustment range and the temperature rising/lowering rate of the cryogenic laser peening system are effectively extended, and the precision of the control of the surface temperature of the sample is increased in combination with a closed-loop control. Additionally, an intelligent control of a cryogenic laser peening process is realized by means of a computer and a PLC control unit, whereby the usage amount of liquid nitrogen in the experiment process is reduced and the processing efficiency is improved.

Abstract: Disclosed herein are an aluminum alloy for an insert ring, an aluminum insert ring using the same, and a piston manufacturing method using the same, and, particularly, are an insert ring manufactured to have high strength and abrasion resistance and reduce its weight by adjusting aluminum alloy components, and a method of manufacturing a piston having high bonding properties to the insert ring through the same.

Abstract: The invention relates to a method for producing a piston (10, 110) for an internal combustion engine, having a main piston body (11, 111) and a piston ring element (12, 112), wherein the main piston member (11, 111) comprises at least one piston skirt (15, 115) and at least one bottom region (27, 127) of a combustion recess (21, 121). The piston ring element (12, 112) comprises a piston crown (19, 119), at least one wall region (28, 28) of the combustion recess (21, 121), a circumferential fire land (22, 122) and at least one part of a circumferential ring part (23, 123) provided with annular grooves. The main piston body (11, 111) and the piston ring element (12, 112) form a circumferential closed cooling duct (24, 124).

Abstract: The present invention relates to a method for producing a multi-part piston (10, 110) for an internal combustion engine, comprising the following method steps: producing an upper piston part (11) and a lower piston part (12), each having an inner support element (22, 26; 122, 126) having joining surfaces (24, 28; 124, 128) and an outer support element (23, 27; 123, 127) having joining surfaces (25, 29; 125, 129), applying a high-temperature solder material in the area of at least one joining surface (24, 28 or 25, 29; 124, 128 or 125, 129), assembling the upper piston part (11) and the lower piston part (12) to form a piston body by establishing a contact between the joining surfaces (24, 28 or 25, 29; 124, 128 or 125, 129), placing the piston body in a vacuum furnace and evacuating the vacuum furnace; heating the piston body at a pressure of at most 10?2 mbar to a soldering temperature of at most 1300° C.

Abstract: A liquid cooled piston of an internal combustion engine includes a piston lower part and piston upper part which has a combustion chamber recess. These piston components are supported via joining lands which are spaced apart radially and together form a dividing plane, and are joined together with a material-to-material fit. In order to receive piston rings, the piston upper part has a ring area and includes an annular cooling channel which extends into the piston lower part and is connected to an inner cooling space via connecting channels. The cooling channel is adjoined by recesses which are oriented in the direction of a piston head, are configured as a blind hole and widen conically starting from the cooling channel as far as a recess bottom. The recess bottom can be of a pronounced undulating enlarged surface or a finely undulating configuration.

Abstract: A method for the production of a piston made of steel, for an internal combustion engine, in which the upper piston part is produced using the forging method, and the lower piston part is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of hot forming and of cold calibration, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.

Abstract: In a piston-ported engine, a sealing ring may be placed in a groove in the cylinder. As the groove is of greater diameter than the cylinder, the sealing ring overlaps into a helix allowing it to be enter the cylinder. However, such a helix does not fit into a groove without when in the helix. Alternatively, a shorter sealing ring is placed into the groove. However, the gap is too large. According to one embodiment, a groove of double the width of the ring is provided and the helical ring is installed and caused to unwind in the groove so that the ring sits in a plane. A spacer ring is placed in the groove to fill the extra space in the groove. An elastomeric material or a tension spring in an outer groove in the sealing ring can be used to cause the ring to press against the piston.

Abstract: A piston with a cast bi-metallic dome feature and a method of making the piston. In one form, the piston is for use in a diesel engine, while in another, the piston is for use in a gasoline engine. The dome feature may include a laminate of a relatively high-temperature material (such as stainless steel) and a relatively low temperature material (such as aluminum or aluminum alloys) such that the portion of the dome made from the relatively high-temperature material is directly exposed to combustion within a cylinder into which the piston is placed. In another form, an aluminum coated stainless steel layer is used to form the dome. In one form, an ablation casting process may be used to manufacture the dome.

Abstract: A piston includes a crown portion generally defining an axis and having a skirt connecting portion. The skirt connecting portion is defined, at least in part, by a first crown mating portion, a second crown mating portion positioned radially from the first crown mating portion, and a crown chamber surface extending between the first crown mating portion and the second crown mating portion. The piston also includes a skirt having a crown connecting portion. The crown connecting portion is defined, at least in part, by a first skirt mating portion, a second skirt mating portion, and a skirt chamber surface extending between the first skirt mating portion and the second skirt mating portion. The first crown mating portion is selectively coupled to the first skirt mating portion. The second crown mating portion may be selectively coupled to the second skirt mating portion to define a piston chamber.

Abstract: A method for producing a piston of an internal combustion engine, designed as a one-piece cooling channel piston. The piston includes an upper part and a lower part supported by corresponding circumferential joining bosses together forming a joining zone. In order to produce a bonded joint of the upper part and the lower part, the joining bosses are connected by means of multiorbital friction welding in the region of a rotationally symmetrical or rotationally asymmetrical joining zone.

Abstract: A diesel piston with a cast bi-metallic dome and a method of making the piston. In one form, the dome may include a laminate of a relatively high-temperature material, for example, stainless steel, and a relatively low temperature material, for example, aluminum or aluminum alloys, such that the portion of the dome made from the relatively high-temperature material is directly exposed to combustion within a cylinder into which the piston is placed. In another form, an aluminum coated stainless steel ring is used to form the dome. In one form, an ablation casting process may be used to manufacture the dome.

Abstract: A method assembling parts uses a shim for filling a void between interfacing part surfaces. The surface profile of each of the part surfaces is determined and a digital volume is generated that substantially matches the void. A three dimensional digital representation of the shim is generated by mapping the part surface profiles onto the digital volume. The shim is fabricated using the three dimensional representation of the shim.

Abstract: A piston may include a piston crown including radially inner and outer crown mating surfaces, the crown defining at least in part a cooling gallery extending about a periphery of the crown. The piston may include a piston skirt including a pair of oppositely disposed pin bosses, the pin bosses each defining a piston pin bore. The piston skirt may have a radially inner skirt mating surface cooperating along a radially inner interface region with the radially inner crown mating surface, and a radially outer skirt mating surface cooperating along a radially outer interface region with the radially outer crown mating surface such that the cooling gallery is substantially enclosed. The piston may include at least one cooling fin extending from an interior surface of the cooling gallery.

Abstract: 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.

Abstract: The invention relates to a valve component, in particular for a piston or a valve, comprising at least one first disk-shaped joining part and at least one second disk-shaped joining part, wherein the first and second joining part each have at least one opening, and wherein once the joining parts have been joined, the opening in the joining parts interacts in such a way that a channel is formed and a fluid medium can flow through the channel. In first and second regions at the joining parts, an at least partially peripheral elevation and/or depression interact with one another in sealing fashion once joined.

Abstract: A piston assembling apparatus includes a piston holding means including a guide tube portion which contains the piston and guides the piston into the cylinder bore. A guide tube support portion supports the guide tube portion to be displaceable in a radial direction thereof. A moving means moves at least one of the piston holding means and the cylinder block so as to locate them at an insertion preparation position where the guide tube portion and the cylinder bore are coaxial with each other. A pressing means presses the piston contained in the guide tube portion toward the cylinder block to insert the piston into the cylinder bore in a state in which the piston holding means and the cylinder block are located at the insertion preparation position, and the guide tube portion is supported by the guide tube support portion to be displaceable in the radial direction thereof.

Abstract: A method for the production of a piston (1) made of steel, for an internal combustion engine, in which the upper piston part (3) is produced using the forging method, and the lower piston part (4) is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of semi-hot forming, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.

Abstract: A piston assembly comprises a piston body, a connecting rod, and a wrist pin. The piston body includes a pair of first cross bores presenting a piston sliding surface. The connecting rod includes a second cross bore presenting a rod sliding surface which is axially aligned with the first cross bores of the piston body. A wrist pin is disposed in the aligned cross bores and couples the piston body to the connecting rod. The wrist pin also presents a pin sliding surface facing the rod sliding surface and the piston sliding surfaces. A coating is applied to at least one of the sliding surfaces, such as by dipping, brushing, atomizing, spraying, printing, or screen printing. The coating includes a polymer matrix, such as polyamide imide (PAI), and hard particles, such as Fe2O3, disposed throughout the polymer matrix. The hard particles have a hardness of at least 600 HV/0.5.

Abstract: An apparatus and method for coupling a piston to a rod to form a cylinder assembly are provided. The piston has a tapped bore extending therethrough for coupling to a first threaded region of the rod. The rod end extends beyond the piston member and includes a second threaded region for coupling to a tapped bore of a retaining member. The piston member is coupled to the rod member at a low torque, e.g., up to about 1000 Nm. An external thread of each of the threaded segment of the piston bore and the first threaded region of the first portion of the rod member may be formed with a root radius of greater than 0.125 pitch or with MJ class thread. The retaining member may include setscrews offset from one another for frictional engagement with the rod end. The thread pitch between the rod and the piston may be coarser than between the rod and the retaining member.

Abstract: 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.

Abstract: A method of friction welding a piston includes forming a piston body by friction welding an upper crown portion to a lower crown portion. At least one of the upper or lower crown portions is provided with a central support post extending along a central axis. The upper and lower crown portions have annular ribs radially outwardly from the central support post, with the ribs being aligned with one another. The method includes initiating a friction weld joint between a free end of the central support post and a corresponding surface opposite the free end of the central support post. Then, after initiating the weld joint between the central support post and the opposite surface, the method continues by then initiating a friction weld joint between aligned free ends of the ribs. Then, the friction weld joints are completed.

Abstract: A method is provided for producing a piston for an internal-combustion engine of the structure in which a piston body which is composed of a crown having a groove for fitting a piston ring into an outer circumference surface and a skirt in connection with the bottom of the crown is provided with an annular cavity for flowing cooling liquid on an inside of the groove, the method comprising the steps of: forming the crown and the skirt individually; forming an annular groove for the annular cavity in the inner bottom of the crown and an annular rib in connection with the open edge of the annular groove before the crown and the skirt are joined together; bending the rib toward the opening of the annular groove by application of pressure to close the opening of the annular groove to thereby form the annular cavity; and joining the crown and the skirt together.

Abstract: A method for the production of a piston for an internal combustion engine has the following steps: producing an upper piston part having at least one joining surface, b) producing a lower piston part having at least one joining surface, c) producing a direct contact between the at least one joining surface of the upper piston part and the at least one joining surface of the lower piston part, d) heating the upper piston part and the lower piston part by induction or by a direct flow of current over the joining surfaces in the region of the joining surfaces that have been brought into direct contact, e) connecting the upper and lower piston parts with one another to produce a piston by a pressing process, and machining the piston to finish it.

Abstract: The invention relates to a piston for a piston-cylinder arrangement, particularly a shock absorber piston, which includes a piston body, that has a circumferential surface. A sealing collar has an outer circumferential surface, an inner circumferential surface, a first peripheral surface, and a first sealing lip, and extends around the circumferential surface of the piston body and covers at least part of the circumferential surface in the axial direction. The first peripheral surface connects the two circumferential surfaces to each other at a first end of the sealing collar. The first sealing lip is delimited by the first peripheral surface and the outer circumferential surface, and the first sealing lip is configured evenly in the circumferential direction.

Abstract: A piston assembly includes an annular body defining a groove, with a ring disposed within the groove. The piston assembly includes a centering device disposed within the groove between an inner face of the ring and a root of the groove. The centering device centers the ring concentrically within the groove when the ring is in an uncompressed condition, prior to installation into a bore of an engine block, to prevent the inner face of the ring from moving radially outward beyond an outer edge of the groove when the ring is in the uncompressed condition.

Abstract: A method for attaching a ring element to a piston for an internal combustion engine, in which the ring element is screwed onto the piston body by a thread applied to the radially outer surface of a part of the piston crown, a circumferential groove that is open towards the top is formed into the piston crown in the region of the thread, the groove is filled with solder material, the piston is heated until the solder material liquefies and flows between the thread channels of the thread and subsequently, the piston is cooled. As a result, a secure screw connection between the basic piston body and the ring element is obtained. Furthermore, the cooling channel is sealed with regard to the combustion gases, which stand under high pressure and act on the piston crown.

Abstract: A method of friction welding a piston includes forming a piston body by friction welding an upper crown portion to a lower crown portion. At least one of the upper or lower crown portions is provided with a central support post extending along a central axis. The upper and lower crown portions have annular ribs radially outwardly from the central support post, with the ribs being aligned with one another. The method includes initiating a friction weld joint between a free end of the central support post and a corresponding surface opposite the free end of the central support post. Then, after initiating the weld joint between the central support post and the opposite surface, the method continues by then initiating a friction weld joint between aligned free ends of the ribs. Then, the friction weld joints are completed.

Abstract: A piston and method of construction is provided. The piston includes a top part fixed to a bottom part. The top part has an uppermost surface with annular inner and outer upper joining surfaces depending therefrom. The bottom part has a pair of pin bosses with pin bores aligned with one another along a pin bore axis; a pair of upwardly extending annular inner and outer lower joining surfaces and a combustion bowl wall. Inner and outer weld joints fix the inner and outer upper and lower joining surfaces to one another. An annular cooling gallery is formed laterally between the upper and lower joining surfaces. The inner weld joint joining the top part to the bottom part is located within the combustion bowl wall and configured to minimized the compression height of the piston.

Abstract: A method for producing a piston for an internal combustion engine, designed as a cooling duct piston for small compression heights. The piston includes a lower part and an upper part which are supported by one or more corresponding joining planes and are connected of a friction welding process. The piston encloses an inner, trough-shaped cooling duct and an outer cooling duct which is axially spaced apart from an annual area. The inner cooling duct is formed in the lower part of the piston by a mechanical machining process, such as a forging process. Transfer openings which are assigned to the cooling ducts are formed before the frictional welding of the joining planes.

Abstract: An installation device includes an extruding mechanism that horizontally extrudes a piston ring, positions the piston ring and, after extruding, is driven downwardly and then returned to a waiting position; a ring holding mechanism that has a guide passage for guiding the piston ring, that is driven so as to move close to and apart from a piston in one direction perpendicular to the extruding direction, and that is capable of defining an insertion hole for insertion of the piston; a ring diameter extending mechanism that extends the diameter of the piston ring, that is driven to enter and leave the guide passage of the ring holding mechanism, and that is reversely driven to a position for defining a part of the guide passage when the diameter-extended state of the piston ring is released; and a piston holding member that holds the piston at a predetermined position.

Abstract: An engine piston is manufactured by assembling an outer shell, comprising a crown and tubular side wall in which a ring groove region and skirt are defined, with a plate-like mounting member and bonding them together by brazing or welding. The mounting member is located within the tubular side wall displaced axially from the crown and is bonded near, but displaced radially from, its centre to the crown and at its periphery to the side wall at the end of the ring groove region. The mounting member carries gudgeon pin boss means facing away from the crown. The outer shell is formed by extrusion or the like that permits minimal wall thickness and the bonded structure is of light weight but great strength and stiffness, particularly in the ring groove region. A combustion bowl formed in the crown facilitates bonding to the mounting member and defines with the mounting member an annular cooling chamber adjacent the ring groove region and crown.

Abstract: The invention relates to a method for producing a piston (1) for an internal combustion engine. The inventive method comprises producing the base (4) from aluminum by a forging process, casting, by way of a composite casting process, a ring support (10) which is provided with a cooling channel (15) into an aluminum ring element (6), and then welding the ring element (6) with the base (4).

Abstract: By forging a metal material, there is formed a dustproof boot 20 in which a side of an opening end portion 20b formed with a groove 34 for a dustproof boot is provided with a diameter smaller than that of a side of a piston main body 20a, and a total thereof is provided with a substantially uniform wall thickness, thereafter, by carrying out ironing from a front end of the opening end portion 20b to the piston main body side, the recess groove 34 for the dustproof boot can be formed by providing a build-up portion 20c at the opening end portion.

Abstract: In order to adapt the damping behavior at a wider range in a process for damping torsional vibrations and in a torsional vibration damper, the length of an elastic element can be changed in dependence on a relative angle between two rotational subassemblies, with the degree of change in length being variable in dependence on the relative angle. Furthermore, a thrust piston of a coupling element, which couples the two subassemblies, can be displaced in dependence on the relative angle, relative to a first one of the two subassemblies.

Abstract: A self-tightening retaining system for securing a closure in position closing an access port of a pump housing. The system includes a retaining cover for obstructing removal of the closure from a bore of the access port. The cover has external threads interengageable with screws threads of the bore. A locking device is configured for being secured to the cover such that the locking device rotates together with the cover. The locking device has a fastener receivable in a hole of the closure and has external threads interengageable with threads of the hole. The threads of the cover and the threads of the fastener are spiraled in opposite directions such that when the cover rotates in a loosening direction, the fastener becomes tightened in the hole of the closure thereby stopping the rotation.

Abstract: A metal sheet ring (5) has a web (15) extending between two fins (10) and (11) projecting towards a carrier hoop (6), wherein free ends of the fins rest on and couple to respective annular seats (8) and (9) defined in an internal face of the carrier hoop, the free ends being sealed by respective annular welding beads (14) to form an internal annular cooling tube (3) having an inside surface constituted by the metal sheet ring and the inside surface (7) of the carrier hoop.

Abstract: A process for inserting a piston pin locking ring, particular slotted snap ring, into a locking groove of a pin bore of a piston. The piston pin locking ring is radially pre-tightened and reduced in size in a first step in such a manner that its outside diameter becomes smaller than the inner diameter of the pin bore. The piston pin locking ring is subsequently introduced in the pre-tightened state into the pin bore without contact and without contacting the inner wall of the pin bore and is brought in position inside the pin bore in the area of the locking groove. Then the piston pin locking ring is freed by a relaxing and loosening of the tightening force and by springing into the locking groove and is thus fixed in place.

Abstract: A system for precisely centering a workpiece within a cylindrical bore such that the center of the workpiece is coaxial with the central axis of the bore. An arbor is used within the cylindrical bore to sense and calculate the location of the central axis. The position of the workpiece is also sensed so that it can be aligned with the central axis. A computer system is used to perform the calculations and provide an indication of alignment of the workpiece and the central axis. The position of the central axis and the workpiece are found via a location determining system that may incorporate electromechanical and optical position sensing systems. For instance, a plurality of light transmitters and light receivers may be used to generate and transmit beams of light used in determining positions. The apparatus has particular application to free piston machines, and particularly free piston coolers.

Abstract: A method for screwing together two metal parts that are spaced apart from one another close to a screw connection element and elastically deformable relative to one another, and for the remainder lie against one another. In order to obtain a firm and secure screw connection, with little expenditure of torque, one of the metal parts is deformed, before the metal parts are screwed together, in such a manner that regions close to the screw connection element come close to one another, and the metal parts are then screwed together. A region of the one metal parts remains deformed after they have been screwed together, as a result of the screw connection element.

Abstract: In order to increase the displacement of a motorcycle engine, the existing cylinder block of the engine is dismounted from its crankcase, and the existing piston is dismounted from its connecting rod. Then, a new piston having a greater diameter than the dismounted existing piston is mounted on the connecting rod, and a new cylinder block having a greater bore diameter than the existing dismounted cylinder block is connected to the crankcase while sliding the new large-diameter piston along the inner wall of the bore of the new cylinder block. The new cylinder block has a bottom end that is located above the top end of the crankcase when mounted on the crankcase. The new piston is short enough not to be inserted into the crankcase when moved to the bottom dead center. This eliminates the need to disassemble the crankcase or any parts in the crankcase. It is thus possible to easily increase the engine displacement.

Abstract: The invention relates to a piston for a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body that is fitted with at least one peripheral web on its peripheral surface, wherein a collar-shaped sealing element made of thermoformable plastic material is also formed on the peripheral surface of the piston body in such a way that the web is only formed in part of the height of the material of the collar-shaped sealing element.

Abstract: A method of manufacturing a piston using a swaging tool includes the step of positioning a portion of a first member and a portion of a second member of the piston within a first end of an opening formed through the swaging tool, such that a reduced diameter portion of the second member is substantially aligned with a first ring portion of the first member and an end portion of the second member contacts a second ring portion of the first member to create an annular space adjacent to the first ring portion and the reduced diameter portion. The method also includes the step of subsequently swaging the first ring portion by moving the first ring portion in a direction toward a second end of the swaging tool, such that a portion of the first ring portion is positioned within the annular space to fix the first member to the second member.

Abstract: A method of forming a jacketed steam distribution tube assembly includes extruding a jacketed steam distribution tube assembly in a single extruder. The jacketed steam distribution tube assembly includes an inner tube, an outer tube, and a plurality of connecting members connecting the inner tube to the outer tube. The inner tube, outer tube, and plurality of connecting members of the jacketed steam distribution tube assembly are simultaneously extruded such that the inner tube and plurality of connecting members are simultaneously extruded within the outer tube in the single extruder, thereby forming a jacketed steam distribution tube assembly having a first predetermined length. The first predetermined length of the jacketed steam distribution tube assembly is then divided into a plurality of jacketed steam distribution tube portions.

Abstract: A method for the production of pistons having depression edge armoring for internal combustion engines, in which a more heat-resistant armoring ring, in comparison with a forged piston blank having a combustion depression, is connected with the piston blank in the region of the depression edge. The method comprises the following steps: a first piston blank is set on a projection of the armoring ring in the region of the depression edge; the armoring ring is connected with the first piston blank by friction-welding; a second piston blank is set onto the projection of the armoring ring, in such a manner that the two piston blanks do not touch; the second piston blank is connected with the armoring ring by means of friction-welding; a the armoring ring is cut between the piston blanks, and the pistons are given their final shape by a cutting work method.

Abstract: A method and system for precisely centering a workpiece within a cylindrical bore such that the center of the workpiece is coaxial with the central axis of the bore. An arbor is used within the cylindrical bore to sense and calculate the location of the central axis. The position of the workpiece is also sensed so that it can be aligned with the central axis. A computer system is used to perform the calculations and provide an indication of alignment of the workpiece and the central axis. The position of the central axis and the workpiece are found via a location determining system that may incorporate electromechanical and optical position sensing systems. For instance, a plurality of light transmitters and light receivers may be used to generate and transmit beams of light used in determining positions. The method has particular application to free piston machines, and particularly free piston coolers.

Abstract: A master cylinder has a cylinder member in the shape of a cylinder, one end of which is closed, and a piston inserted in the cylinder member to form a pressure chamber in the cylinder member. The cylinder member is formed with a port for providing communication between the pressure chamber and a reservoir. The port is formed during casting of the cylinder member, thereby eliminating the need to form the port by boring, and forming the port into an elongated-hole shaped sectional configuration.

Abstract: The invention relates to a cup-shaped hydraulic piston (10) made from rolled sheet metal, which comprises an open end (12), a side wall (16) with a cylindrical outer surface (18) and an inner surface (22), as well as a piston head (14). The side wall (16) at its outer surface (18) is provided with an annular groove (20) in a portion adjoining the open end (12). To ensure a lightweight style of construction combining high stability with ease of manufacture, the part of the inner surface (22) adjoining the open end (12) and extending axially over the annular groove (20) has a cylindrical shape, and the thickness of the side wall (16) decreases monotonically from the portion (24) of the inner surface (22) up to the piston head (14).

Abstract: A piston includes a piston structure being unitarily formed in a powder metallurgy process, the piston structure having a crown assembly and a skirt assembly, at least a partial combustion chamber being formed intersecting a piston crown surface during the powder metallurgy process, the skirt assembly depending from the crown assembly and having two spaced apart pin bosses, each pin boss having a pin bore defined therein, a pair of opposed semi-circular skirt members, each skirt member extending outwardly from and being integrally joined to both of the pin bosses. The piston may be formed by executing a powder metallurgy process on at least two different metallic constituents to define a non-homogenous piston structure. A method of forming a piston is further included.

Abstract: An automatic piston inserting equipment comprises a block positioning means for positioning a cylinder block B to a piston inserting position, a piston positioning means for moving and positioning a piston P with a connecting rod R for insertion thereof into a cylinder bore formed in the cylinder block B vertically from above, a cap positioning means for moving and positioning a connecting rod cap C to clamp it vertically from below to the connecting rod R inserted into the cylinder bore, a damp means for damping the connecting rod cap C to the connecting rod R, and a vision system. The vision system detects central position coordinates of the cylinder bore lying at the piston inserting position and central position coordinates of the piston P lying at a start-point chuck position, and on the basis of both such central position coordinates calculates a movement quantity for insertion of the piston P into the cylinder bore.

Abstract: A method for the production of a one piece piston for an internal combustion engine. The piston has a ring shaped cooling channel arranged in an outer region of a piston head. The channel is partially closed off by a circumferential projection structured as an oil groove. The piston is produced in a simple and inexpensive manner using a piston blank using cutting work such as lathing.