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| Number | Title | Issue Date |
| 7210399 | Two-part piston for an internal combustion engine A two-part piston for an internal combustion engine has a piston head and a piston skirt. The piston head has a piston crown on the underside of which at least two boss lands, each provided with a head boss and a head boss hole are connected. The piston skirt has at... | 05/01/2007 |
| 7194989 | Energy efficient clean burning two-stroke internal combustion engine A precision cast engine has a piston unit and a rotor unit to translate linear thrust from the piston unit into rotary power. Each piston rod is attached to a thrust absorber carriage running on precision bearings to eliminate piston drag on the cylinder walls. One ... | 03/27/2007 |
| 7005620 | Piston and method of manufacture A piston particularly adapted for heavy-duty diesel engine applications is fabricated from separate parts having circumferentially extending joining surfaces that are heated prior to bonding to an elevated temperature sufficient to enable bonding of the joining surf... | 02/28/2006 |
| 6935221 | Method for manufacturing an aluminum die cast piston for reciprocating compressors A die cast aluminum piston for a reciprocating compressor. The piston is cast with no coring and thus includes no aperture in the as-cast piston for a wrist pin. The aperture for the wrist pin is subsequently formed in the wrist pin in a preselected location after c... | 08/30/2005 |
| 6923153 | Piston and connecting rod assembly having phosphatized bushingless connecting rod and profiled piston pin The present invention relates to a connecting rod and piston pin assembly for an internal combustion engine to improve wear of the piston/connecting rod pivot point and reduce deformation of the pin bore. To this end, the assembly includes a piston having a pin bore... | 08/02/2005 |
| 6729291 | Multipart cooled piston for an internal combustion engine A multipart cooled piston for an internal combustion engine comprises an upper part and a lower part of the piston. The two parts are screwed together via a threaded bolt that is arranged on the upper part of the piston, and a threaded bore that is drilled into the ... | 05/04/2004 |
| 6715457 | Piston assembly A piston assembly for an internal combustion engine comprises a piston body having a head and a pair of pin bosses depending from the head having a pair of pin bores aligned along a pin bore axis. A piston skirt has a pair of opposed skirt portions and a pair of opp... | 04/06/2004 |
| 6520069 | Piston pin for internal combustion engine In a piston engine, end play of the piston pin can be prevented without unduly shortening the pin. In the simplest design (FIG. 4), a full length piston pin can have spherical end surface in close clearance spacing relative to the combustion chamber surfa... | 02/18/2003 |
| 6499387 | Unified multi-piece piston and method of manufacture A method of manufacturing a piston for heavy-duty diesel engine applications comprises forming a piston body having a pair of pin bosses, and bonding separately formed skirt portions to the pin bosses. The resultant piston has the separately formed skirt ... | 12/31/2002 |
| 6276260 | Connecting-rod/piston unit for small reciprocating machines and a motor-driven compressor or a similar reciprocating machine comprising the unit A gudgeon pin (14) is held in engagement with a bearing seat situated inside a piston (16) by retaining means in the form of a pincer element (30) with a base portion (32) fixed to the end wall (20) of the piston (16) and with two pairs of resilient jaws ... | 08/21/2001 |
| 6062125 | Piston-cylinder assembly In a piston-cylinder assembly with a shaftless piston, the aim is to improve the lateral guidance of the connecting rod, to reduce edge wear and the seizing tendency in the event of fault during the combustion process. Consequently, the piston has at leas... | 05/16/2000 |
| 5921755 | Dry vacuum pump A vacuum pump is provided with at least one cylinder having a cylinder liner and a piston mounted for reciprocating movement within the cylinder liner. The piston is connected to a crankshaft for reciprocating the piston and the piston is provided with a ... | 07/13/1999 |
| 5890417 | Piston for a reciprocating compressor A piston/cylinder assembly for a reciprocating compressor has a piston comprising telescopingly connected first and second piston members. The first piston member is connected to a connecting rod. The second piston member is provided with a piston head an... | 04/06/1999 |
| 5865092 | Engine connecting rod and double piston assembly A piston for internal combustion engines with an inner piston eccentrically disposed inside the outer piston. The outer piston is attached to a journal at the top of the connecting rod by a wrist pin in the usual manner. The inner piston is attached by a ... | 02/02/1999 |
| 5794582 | Connecting structure of piston and connecting rod An internal combustion engine includes a piston having a crown portion with a bottom surface and a skirt projecting therefrom to form a cavity, and a connecting rod having at one end a semicylindrical yoke portion with an upwardly directed semicylindrical... | 08/18/1998 |
| 5701802 | Multipart piston for an internal combustion engine An engine piston includes a piston head; a first bearing block forming a one-piece component with the piston head and having a first bearing face; a piston skirt being a component separate from the piston head; a second bearing block forming a one-piece c... | 12/30/1997 |
| 5499572 | Bi-tech piston A piston for developing compression within the cylinder of a combustion engine or other type compression generating apparatus; said piston being a two-piece assembly, whereas the topside portion, or traditionally known as the crown, being of relative disc... | 03/19/1996 |
| 5413074 | Piston and a connecting rod apparatus A groove in a direction of a crank shaft is provided in an inner surface of a top wall of a cup-shaped inner sleeve. The groove provides a stop for a semicylindrical slidable guide member that cooperates with a cylindrical concave portion of a cylindrical... | 05/09/1995 |
| 5367945 | Floating piston pin retainer A piston connecting rod assembly has a floating piston pin that is retained in centered assembly by a retainer clip having hooked fingers that lock into grooves in one end of the piston bore and hooked stringers that lock the piston pin in position after ... | 11/29/1994 |
| 5307732 | Piston assembly having a wrist pin bolted therein The design and construction of past piston assemblies having a wrist pin bolted to a connecting rod have excessive weight and structural components, and requires more complex machining techniques and tooling. The present invention overcomes these problem ... | 05/03/1994 |
| 5289758 | Pin plugs for use in a piston assembly The design and construction of past piston assemblies having a wrist pin retained by a pair of snap rings positioned in a groove. Other past piston assemblies have a stubpin or cap positioned within a bore of a piston member or the wrist pin. In these app... | 03/01/1994 |
| 5150517 | Method of manufacturing a piston A method to manufacture an articulated piston head wherein the two portions composing the head, i.e. the top portion and the pin boss portion, are formed separately from blanks of forged or cast chromium-molybdenum steel or a low alloy steel, subjected to... | 09/29/1992 |
| 5144884 | Two-part piston assembly device A piston assembly for use in a piston cylinder of an engine is disclosed. The piston assembly includes a piston rod which connects the piston assembly to a crankshaft. The piston rod has a pin receiving opening at an upper end. A piston head having a tran... | 09/08/1992 |
| 5113817 | Piston with specific land characteristics A piston for an internal combustion engine with a separate head and skirt which are joined by a piston pin. The ring belt extends downward from head and terminates above the pin. The space between the lower edge of the ring belt and a section of the head ... | 05/19/1992 |
| 5072654 | Piston and bearing assemblies A novel prefinished piston pin insert bearing is described wherein the tight radial clearances required for acceptable bearing function are maintained in spite of the tolerances required for assembly through a unique inner bearing surface geometry and thr... | 12/17/1991 |
| 5040454 | Piston assembly and piston member thereof having a predetermined compression height to diameter ratio Present day diesel engines having aluminum piston assemblies are limited to combustion chamber pressures of approximately 12,410 kPa (1,800 psi) whereas the desire is to increase such pressures up to the 15,170 kPa (2,200 psi) range. To reach such levels ... | 08/20/1991 |
| 4964332 | Piston and connecting pin assembly, a crosshead and connecting pin assembly, and a connecting pin assembly The pin assembly comprises a piston or crosshead connecting pin which has a throughgoing, axial hole formed therein which is tapped at one end to receive a headed fastener. Radial bores are formed in the connecting pin which bores open onto the axial hole... | 10/23/1990 |
| 4945998 | Hydraulic impact tool An impact tool including a cylinder, a piston slidably mounted in the cylinder and a valve for selectively opening and closing oil feed channels to move the piston up and down. A cylindrical member is slidably mounted on the piston around its large-diamet... | 08/07/1990 |
| 4932314 | Segmented piston A split piston in an internal combustion engine, having a base rockably secured to the connecting rod, and a detachable ring head which interfaces with the cylinder wall. The detachable ring head is snugly fitted onto a cylindrical extension of the base h... | 06/12/1990 |
| 4930405 | Reciprocating piston compressor for small refrigerating machines and assembly method therefor In a compressor which has a connecting rod comprising: a second eye (31) connected to the crank pin (12) and a crankshaft (7) and including a radial projection (32) with a longitudinal slot (33), said longitudinal slot (33) having at least two end faces (... | 06/05/1990 |
| 4928578 | Pistons with bearing members Pistons are described comprising a crown portion and a skirt portion, the crown portion having depending from the underside thereof a boss, the boss having secured thereto at least two bearing members in fixed relationship to the piston body and which bea... | 05/29/1990 |
| 4917003 | Piston to rod mounting assembly A hydraulic cylinder, piston and rod assembly wherein the piston is secured to the rod in an efficient and inexpensive manner. The piston includes a threaded interior which is secured to a corresponding threaded portion on the end of the piston rod. An op... | 04/17/1990 |
| 4876947 | Pistons with bearing lands Pistons are discribed comprising a crown portion which also includes a piston ring belt and gudgeon-pin bosses and which crown portion comprises a ferrous allow and a seperate articulated skirt portion comprising a casting of aluminum alloy, steel or cast... | 10/31/1989 |
| 4811654 | Internal combustion engine piston with laterally offset crudgeon-pin bore in piston head and body portions Piston for combustion engines consisting of an upper part forming the piston crown and a lower part forming the piston body. These two piston parts abut via annular contact surfaces in the piston axial direction and are coupled together via a gudgeon pin ... | 03/14/1989 |
| 4805518 | Piston A crosshead piston 10 comprises a head member 18 and a skirt member 20, each of which can be secured independently to a piston pin 14. The skirt 20 has a reduced diameter upper end portion 66 which fits within lower end 24 of the head member ring belt por... | 02/21/1989 |
| 4751871 | Multisectional piston with plural ceramic parts and rigidly connected piston rod for use in horizontally opposed piston internal combustion engine A multisectional piston for opposed-piston, slider-crank-drive internal combustion engines. The piston has a ceramic skirt (1), a skirt head (2), and a ceramic piston head (3) with fire land (4). The ceramic piston head is provided with annular groove (6)... | 06/21/1988 |
| 4727795 | Pistons The height of a piston for an internal combustion engine is reduced by the provision of gudgeon pin bores which intersect or at least partly intersect a ring band extending around the crown. This allows the mass of the piston to be reduced and allows impr... | 03/01/1988 |
| 4709620 | Piston and connecting rod assembly In a piston and connecting rod assembly for reciprocating piston machines the bending load applied to the piston pin bosses owing to the deformation of the piston pin to an oval shape should be prevented and the weight should be reduced. This is accomplis... | 12/01/1987 |
| 4690038 | Hydraulically actuated piston machine with bearing for connecting piston to piston rod A piston machine, particularly a hydraulically-actuated piston machine, comprises at least one cylinder having an axis, a piston axially slidable in the cylinder and having a piston bottom with an inner surface, a piston rod turnably connected with the pi... | 09/01/1987 |
| 4603617 | Multi-part plunger piston for internal combustion engines A multi-part plunger piston for internal combustion engines, comprises a piston upper part and lower part which engage one on the other through coinciding annular abutment surfaces. The parts are connected with one another by screws which pass through the... | 08/05/1986 |
