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| Number | Title | Issue Date |
| 7421782 | Method for manufacturing internal combustion engine piston A method is provided for efficiently manufacturing a high quality internal combustion engine piston having an annular cavity allowing for good circulation of cooling fluid. An annular groove is formed at the circumferential edge of the top face of a piston crown, or... | 09/09/2008 |
| 7185572 | Method for rounding off the edge of a recess on a piston The aim of the invention is to produce a rounding off on a diesel piston comprising a combustion recess and valve recesses that lie at a slant in relation to the piston floor. The rounding off should not significantly increase particle emissions. To this end, the ed... | 03/06/2007 |
| 7086152 | Engine piston and manufacture thereof A method of forming a low-friction, helically ridged skirt surface of an engine piston comprises cutting a continuous groove in a piston body rotating about axis so that adjacent groove turns intersect as ridges and carry lubricating oil which forms a film on the ri... | 08/08/2006 |
| 6938603 | Method for the production of a one-piece piston for an internal combustion engine 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 g... | 09/06/2005 |
| 6789313 | Piston pin lock ring insertion tool and method A piston-pin lock-ring-insertion tool has a ring-insertion tube (1) in ring-insertion relationship to a ring pusher (2). The ring-insertion tube has an inside periphery with a press-close taper (8) that is tapered inwardly from a ring-feeder end... | 09/14/2004 |
| 6772846 | Method for drilling shaker bores into the cooling channel of a single-part piston A method for drilling shaker bores into a cooling channel of a single-part piston, in which gudgeon-pin bosses each having a gudgeon-pin bore and piston shaft elements are molded onto the piston head via a tie-up substantially extending fully around in the form of a... | 08/10/2004 |
| 6671943 | Method of manufacturing a piston In a method of manufacturing a sliding member, a granular spraying material is sprayed on at least a part of a surface of a body portion made of a structural material in at least partially fusing condition and in the direction which is parallel to or diag... | 01/06/2004 |
| 6588762 | Lathe cut face seal and method for sealing irregularly shaped cavity A lathe cut sealing ring includes a substantially cylindrical ring of elastomeric material formed about a central axis. The ring includes a rectangular cross-section and has an inner diameter, an outer diameter, opposite planar upper and lower surfaces, a... | 07/08/2003 |
| 6546626 | Method of producing a piston In a method of producing a piston (10) for an internal combustion engine including at least one strengthened piston ring groove at least one relatively narrow groove (14) is configured in the region of the upper and/or lower flank of the provided piston r... | 04/15/2003 |
| 6487773 | Method of making one-piece piston The invention concerns a method of producing a one-part piston which, in the region of the piston ring zone, has a closed cooling duct and a recess between the piston ring zone and the box-shaped piston body. The method comprises the following steps: A pi... | 12/03/2002 |
| 6101713 | Method of calibrating a pre-formed recess A method of calibrating a component having first and second opposite large surfaces and a peripheral surface which interconnects the large surfaces and which is provided with a recess, includes the steps of placing the component in a calibrating die, ther... | 08/15/2000 |
| 5903974 | Method of and apparatus for producing hollow ring groove insert for engine piston A method of and apparatus for producing a hollow ring groove insert for an engine piston, which is inserted by casting near the top of a piston for an engine to constitute a ring groove and a cooling path adjacent to the ring groove. The hollow ring groov... | 05/18/1999 |
| 5901772 | Method for casting pistons A ring carrier, for use in a piston casting die, is an annular-shaped member having a channel on an outer surface area. The piston casting die includes projections for engaging the channel and supporting the ring carrier within the piston casting die. At ... | 05/11/1999 |
| 5794517 | Piston assembly A piston assembly that is movable back and forth parallel to its axis in a cylindrical housing, comprising a piston-like support part made of a hard material and a guide ring made of a polymer. The guide ring surrounds the support part along a portion of ... | 08/18/1998 |
| 5778533 | Method of producing a one-part cooling duct piston The invention concerns a method of producing a one-part piston which, in the region of the piston ring zone, has a closed cooling duct and a recess between the piston ring zone and the box-shaped piston body. The method comprises the following steps: a pi... | 07/14/1998 |
| 5743012 | Piston and piston ring A method of reducing wear between the radial faces of a piston ring and the radial faces of the co-operating piston ring groove in an aluminium alloy piston is described. The method comprises the steps of locally alloying the region in which the piston ri... | 04/28/1998 |
| 5655433 | Piston-piston ring assembly and method for reducing engine exhaust emissions A piston--piston ring assembly for an internal combustion engine reduces hydrocarbon emissions without significantly increasing the cost of the engine. The assembly includes an upper piston ring groove and a piston ring which acts as check valve to preven... | 08/12/1997 |
| 5653021 | Production process of a piston To improve the abrasion resistance by increasing the ratio of copper content in the copper-type alloy layer on the periphery of the ring groove of a piston. A peripheral groove having a section of a roughly large trapezoidal shape larger than that of the ... | 08/05/1997 |
| 5588350 | Manufacture of banded pistons A banded cylindrical piston for use in fluid cylinders is produced by hot-forming a relatively thin, flat washer made of polytetrafluoroethylene (PTFE) onto a grooved piston. A hot-forming sizing tube has a beveled entrance end on which the washer is init... | 12/31/1996 |
| 5515770 | Piston having laser hardened primary compression ring groove and method of making same The piston made in accordance with the teachings herein includes a primary compression ring groove, a bottom and rear wall surface of which are hardened by the method of laser hardening. The method includes the steps of spraying the primary groove with a ... | 05/14/1996 |
| 5469777 | Piston assembly having abradable coating A piston assembly operable within a fluid bathed, cylinder wall, comprising a piston body (10) having at least one annular land (36) adapted to be in close-fitting relationship to the cylinder wall (37) an abradable coating (15) tenaciously adhered to sai... | 11/28/1995 |
| 5396787 | Method of producing fluid-chamber component elements To form a seal ring groove in the outer peripheral surface of a steel plate having a circular contour, the present invention provides a method of producing fluid-chamber component elements by which the peripheral portion of the steel plate held by and bet... | 03/14/1995 |
| 5301599 | Pistons with ring groove reinforcing Pistons and a method for their manufacture are described. The piston has at least one piston ring groove reinforcing member being annular in form and having, in cross-section, upper and lower, generally radially extending face portions and a radially inne... | 04/12/1994 |
| 5231916 | Cold-worked piston for hydraulically operating brake For the elimination of distortion of a thin walled cold formed brake piston the piston (1) perimeter wall (5) is stiffened by one or more formed grooves (3) and one or more inwardly projecting ridges each formed by a corresponding groove. The shaping of t... | 08/03/1993 |
| 5094149 | Pistons having a component incorporated therein Pistons and a method for making them are described. The pistons have reinforcing components, such as piston ring groove inserts, incorporated therein. The reinforcements have one or more porous bodies joined thereto, for example, by brazing and which are ... | 03/10/1992 |
| 4847964 | Method of producing a crown for an articulated piston A method of producing a steel alloy articulate piston crown from a forging including the steps of rough machining a combustion crater, a top face, a plurality of ring grooves and a bottom face, chucking on a member inserted into a pin receiving bore, draw... | 07/18/1989 |
| 4794775 | Method of producing a heat transfer tube for single-phase flow A method for producing a heat transfer tube for single-phase flow having rows of discontinuous projections formed on the inner surface thereof along one or more spiral curves. Each projection has a circular, elliptic or a similar cross-section constituted... | 01/03/1989 |
| 4739684 | Apparatus for finishing pistons and the like and method therefor A method and apparatus for finishing pistons (10) and the like from foundry-turned castings during one clamping operation provide enhanced manufacturing productivity. Separate boring and turning modules (34, 24) of the apparatus are mounted on a primary b... | 04/26/1988 |
| 4658487 | Method for the manufacture of a piston The method relates to the manufacture of a piston. This piston comprises a head and a stem extending transversely with respect to the head. A profiled element in bar form is first taken, the profile of which envelops that of the piston. This profiled elem... | 04/21/1987 |
| 4599936 | Integral strut and piston groove protector An integral strut and groove protector assembly is provided for incorporation within a light metal piston. The assembly includes a ring groove protector, an expansion control strut, and a connecting member connecting the groove protector and strut. All ar... | 07/15/1986 |
| 4562327 | Piston and process of providing wear-resisting surfaces in the ring grooves of an aluminum alloy combustion engine piston An arc welding process is used for form wear-resistant surfaces at least in the uppermost ring groove of aluminum alloy pistons for internal combustion engines. To reduce the manufacturing costs and to avoid an increase of the weight of the piston, the pi... | 12/31/1985 |
| 4494294 | Method of manufacture of hydraulic cylinders utilizing bronze overlays for engaging surfaces The method of manufacture of a hydraulic cylinder in which a piston for the cylinder is formed from a steel workpiece which is rotated and a bronze overlay fused into its surface while it is rotating, the overlay being continuously monitored and machined ... | 01/22/1985 |
| 4488522 | Pistons including inserts A piston includes an insert, such as a piston ring insert or crown insert. In order to prevent the insert springing off the piston body in an axial direction, the insert is so formed with a recess or recesses which interlock with projections on the piston... | 12/18/1984 |
| 4485656 | Transmission piston and method of making the same The invention pertains to a piston for use in vehicle automatic transmissions and the method of making the same. An automatic transmission piston is of an annular configuration having a radial pressure face and an axially extending flange which includes a... | 12/04/1984 |
| 4435893 | Method of manufacture of hydraulic cylinders utilizing bronze overlays for engaging surfaces The method of manufacture of a hydraulic cylinder in which a piston for the cylinder is formed from a steel workpiece which is rotated and a bronze overlay fused into its surface while it is rotating, the overlay being continuously monitored and machined ... | 03/13/1984 |
| 4387627 | Piston ring groove reinforcement A piston having a piston ring groove which is bounded on at least one side by a reinforcing element. The reinforcing element is provided with at least one recess into which material of the piston extends to establish a bond between the reinforcing element... | 06/14/1983 |
| 4360956 | Piston having at least one piston ring groove A piston made of an aluminum alloy has at least one piston ring groove defined by two side walls and a bottom wall. At least one preferably both side walls of the piston ring groove(s) are formed or defined by a zone, which has been hardened by an energy ... | 11/30/1982 |
| 4292936 | Aluminum based alloy pistons for internal combustion engines A piston for internal combustion engines has piston ring grooves at least one of which is totally or partly defined by an embedded body of a Fe based sintered material containing Ni and Cu. The sintered material is of a density of 5.5 to 6.8 g/cm3. | 10/06/1981 |
| 4233490 | Method of reinforcing aluminium alloy piston ring groove Disclosed is a method of reinforcing an aluminium alloy piston ring groove wherein the piston body is fused to a certain depth around the periphery thereof in the zone where the ring groove is to be cut, with simultaneous introduction of an alloying addit... | 11/11/1980 |
| 4125926 | Method of making aluminum piston with reinforced piston ring groove An aluminum piston for use in heavy duty internal combustion engines is disclosed, in which the grooves for receiving the piston rings are formed in stainless steel inserts fusion bonded directly to the aluminum without an intermediate metallic layer othe... | 11/21/1978 |
