Abstract: A device lubricates a connecting rod bearing on a crankshaft of an internal combustion engine. The device has a piston having an internal piston cooling fluid channel, and an outlet channel in fluid communication with the fluid channel. The device has a connecting rod, which is connected to the piston in an articulated, in particular pivotable, manner, and has a large connecting rod eye and a connecting channel. The large connecting rod eye is formed for receiving the connecting rod bearing. The connecting channel forms a fluid connection between the outlet channel and the large connecting rod eye so that a fluid, in particular a cooling lubricating fluid (e.g. oil), can be fed, or is fed, from the fluid channel to the large connecting rod eye via the outlet channel and the connecting channel. The connecting rod bearing can be lubricated by cooling oil from the fluid channel of the piston.

Abstract: A piston assembly and method of construction thereof for an internal combustion engine are provided. The assembly includes a piston head having an upper combustion wall with an undercrown surface and a ring belt region. The piston head has a floor with an upper surface and a bottom surface. The floor is spaced beneath the upper combustion wall in radial alignment with the ring belt region. A substantially enclosed, annular cooling gallery is bounded by the undercrown surface and the floor. A pair of pin bores depends directly from the floor of the cooling gallery. The assembly further includes a pin having ends configured for oscillating receipt in the pin bores. A pin bearing surface extends within the pin bores and between the pin bores in the lower surface of the floor. The assembly includes a connecting rod with an end fixed to the pin for conjoint oscillation therewith.

Abstract: An axial piston machine is shown comprising a cylinder drum rotatable around an axis of rotation and having at least a cylinder, a piston arranged in said cylinder, a swash plate arranged in front of said cylinder drum, said piston being provided with a slipper (11) resting against said swash plate and having a pressure area (17) on a side facing said swash plate, wherein a cylinder axis of said cylinder is arranged on a circle line (27) around said axis of rotation (16). Such a machine should be made compact. To this end said pressure area (17) deviates from a circular form.

Abstract: An electromagnetic pump including a piston, an electromagnetic portion that moves the piston forward, and a spring that moves the piston backward. The piston including a discharge check valve built in the piston. The piston is formed with a hollow portion that opens in an inner peripheral portion of an end surface of the piston, and a spring receiving surface formed on an outer peripheral portion of the end surface to receive the spring. The discharge check valve is fixed through plastic deformation of the piston by inserting the discharge check valve into the hollow portion from an opening of the piston, and partially pressing a portion of the spring receiving surface of the piston on an inner peripheral side after the insertion to recess the spring receiving surface and elevate an inner peripheral surface of the piston surrounding the hollow portion.

Abstract: A piston assembly and method of construction thereof for an internal combustion engine are provided. The assembly includes a piston head having an upper combustion wall with an undercrown surface and a ring belt region. The piston head has a floor with an upper surface and a bottom surface. The floor is spaced beneath the upper combustion wall in radial alignment with the ring belt region. A substantially enclosed, annular cooling gallery is bounded by the undercrown surface and the floor. A pair of pin bores depends directly from the floor of the cooling gallery. The assembly further includes a pin having ends configured for oscillating receipt in the pin bores. A pin bearing surface extends within the pin bores and between the pin bores in the lower surface of the floor. The assembly includes a connecting rod with an end fixed to the pin for conjoint oscillation therewith.

Abstract: Apparatus for drainage by well points, including a piston pump and a drive motor coupled to the piston pump by means of a transmission and provided with a drive shaft, which transmission is received in a housing and includes at least one crankshaft and a drive rod coupled thereto, the drive rod is coupled by means of a cross-head to a piston rod of the piston pump and the housing forms an oil sump and the transmission further includes an assembly of a worm and a worm wheel co-acting therewith and mounted on the crankshaft and the worm is provided on a worm shaft extending transversely relative to the crankshaft and vertically in operating mode of the apparatus for drainage by well points.

Abstract: A system, in certain embodiments, includes a crosshead having a crosshead body, a recess formed in an outer surface of the crosshead body, and a lubricant port extending through the crosshead body from the recess to an aperture of the crosshead, wherein the crosshead is configured to move in a reciprocating motion in a machine.

Abstract: A positive displacement pump comprising a lubricant manifold comprising a first fluid pathway, a housing comprising a second fluid pathway in fluid communication with the first pathway, a crosshead slide within the housing and comprising a third fluid pathway in fluid communication with the second pathway; a crosshead configured to reciprocate within the crosshead slide, the crosshead comprising a fourth fluid pathway in fluid communication with the third pathway, the crosshead further comprising a wrist-pin having a fifth fluid pathway in fluid communication with the fourth pathway, a crankshaft within the housing, and a connecting rod disposed between the crosshead and the crankshaft and connected thereto, wherein the connecting rod comprises a sixth fluid pathway displaced from the connecting rod centerline and in fluid communication with the fifth pathway, and wherein the crankshaft end of the connecting rod comprises a seventh fluid pathway in fluid communication with the sixth pathway.

Abstract: Embodiments relate generally to energy storage systems, and in particular to energy storage systems using compressed gas as an energy storage medium. In various embodiments, a compressed gas storage system may include a plurality of stages to convert energy into compressed gas for storage, and then to recover that stored energy by gas expansion. In certain embodiments, a stage may comprise a reversible compressor/expander having a reciprocating piston. Pump designs for introducing liquid for heat exchange with the gas, are described. Gas flow valves featuring shroud and/or curtain portions, are also described.

Abstract: An axial piston machine is provided. The pivoting cradle of the axial piston machine has variable tilt. The axial piston machine has at least one adjustment device extending substantially in the longitudinal direction of the axial piston machine. The axial piston machine further has a return element for returning to a position of the pivoting cradle. The return element and the adjustment device are disposed in a plane extending parallel to an axis of rotation of the axial piston machine and perpendicular to a pivoting axis of the pivoting cradle.

Abstract: A positive displacement pump comprising a lubricant manifold comprising a first fluid pathway, a housing comprising a second fluid pathway in fluid communication with the first pathway, a crosshead slide within the housing and comprising a third fluid pathway in fluid communication with the second pathway; a crosshead configured to reciprocate within the crosshead slide, the crosshead comprising a fourth fluid pathway in fluid communication with the third pathway, the crosshead further comprising a wrist-pin having a fifth fluid pathway in fluid communication with the fourth pathway, a crankshaft within the housing, and a connecting rod disposed between the crosshead and the crankshaft and connected thereto, wherein the connecting rod comprises a sixth fluid pathway displaced from the connecting rod centerline and in fluid communication with the fifth pathway, and wherein the crankshaft end of the connecting rod comprises a seventh fluid pathway in fluid communication with the sixth pathway.

Abstract: A method of manufacturing a connecting rod assembly including the steps of defining a small end of a connecting rod assembly having a terminal end and then defining a pin bore extending through the small end of the connecting rod assembly. A pair of channels is formed on opposite sides of the small end of the connecting rod assembly wherein the axis of each of the channels is substantially perpendicular to the axis of the pin bore. At least partially annular grooves are formed within the pin bore adjacent the distal end of the pin bore. The connecting rod assembly is then machined to reduce the width of the small end between each channel and the terminal end to provide a small end having a reduced width configuration wherein the grooves are disposed along at least a portion of the distal end to reduce the need to deburr the area adjacent the pin bore.

Abstract: In order to decrease internal friction of a heat engine that converts a reciprocating motion of a piston into a rotational motion, a piston apparatus (1) forms an air bearing between a crankshaft (30) and a bearing unit (9B) provided in a crankcase (9) and between an eccentric portion (30c) of the crankshaft (30) and a large end portion (201) of a connecting rod (20) by feeding a gas therebetween from a crank-side hollow portion (31) of the crankshaft (30). The piston apparatus 1 also forms an air bearing between a piston pin (40) and a small end portion (202) of the connecting rod (20) by feeding a gas therebetween from a piston pin-side hollow portion (43) in the piston pin (40).

Abstract: A reciprocating compressor is disclosed. The compressor includes a piston mounted to reciprocate inside of a cylinder that draws a working fluid into an inside of the cylinder, compressing, and discharging the working fluid to an outside of the cylinder, a connecting rod connected between a crank shaft and the piston that converts a rotating movement of the crank shaft into reciprocating movement of the piston, a piston pin arranged to pass the cylinder and one end of the connecting rod at the same time, and an oil passage formed to make a clearance between an inside surface of the one end of the connecting rod and an outside surface of the piston pin in communication with an outside of the clearance.

Abstract: In order to decrease internal friction of a heat engine that converts a reciprocating motion of a piston into a rotational motion, a piston apparatus (1) forms an air bearing between a crankshaft (30) and a bearing unit (9B) provided in a crankcase (9) and between an eccentric portion (30c) of the crankshaft (30) and a large end portion (201) of a connecting rod (20) by feeding a gas therebetween from a crank-side hollow portion (31) of the crankshaft (30). The piston apparatus 1 also forms an air bearing between a piston pin (40) and a small end portion (202) of the connecting rod (20) by feeding a gas therebetween from a piston pin-side hollow portion (43) in the piston pin (40).

Abstract: The invention relates to a tubular piston for a piston engine, comprising a tubular section, a collar shaped region and a ball pivot formed thereon, and an inner tube arranged in an outer tube. A cavity is at least partially formed between the outer tube and the inner tube. Said cavity is sealed from the area surrounding the hollow piston in a pressure-tight manner, by a material, especially a solder material, which is arranged in the cavity in a positively locking manner by means of heating.

Abstract: A powertrain for an internal combustion engine having a connecting rod with a piston supported at one end which is adapted for easy assembly and disassembly without expensive tools. The piston is supported on the connecting rod by a universal joint defined by a spherical surface of an integral connecting rod end and an end plate of the piston having a correspondingly configured spherical recess. The connecting rod end is formed with flat surfaces on opposed sides for engagement by releasable securement members which maintain the piston in proper seated position on the connecting rod during normal usage, but which are releasable to permit removal of the piston upon rotation of the connecting rod 90° about its longitudinal axis.

Abstract: A crosshead piston assembly has a piston body with an upper head portion formed with a plurality of piston rings and a lower stem portion formed with a pin bore. The pin bore has a pair of lower, laterally spaced mounting ears presenting a bearing support surface interrupted by a lateral gap between the ears. A saddle is arranged opposite the ears and provides a bearing support surface which is continuous along the pin bore. A three-piece slipper bearing set is disposed in the pin bore and includes a pair of lower bearing shells seated in the ears and an upper bearing shell seated in the saddle. The upper bearing shell and saddle are formed with aligned oil supply and retaining holes. The oil supply hole is maintained fully open, while a retaining pin is installed in the aligned retention holes to support the upper bearing shell against movement relative to the saddle.

Abstract: A reciprocating air brake compressor includes a crank case housing a crank shaft and a piston assembly operatively connected to the crank shaft via a connecting rod. The piston assembly includes a piston moveable within a bore of the crank case, a piston ring disposed on a peripheral surface of the piston, and a wrist pin rotatably connecting the connecting rod to the piston. A means is provided for generating an air stream free of oil. In one embodiment, the means includes a channel extending through the crank shaft and connecting rod for delivering oil to the crank shaft and wrist pin bearings. The means further includes first and second sealing assemblies disposed adjacent the crank shaft and wrist pin bearings respectively. In another embodiment, the means includes crank shaft bearings and wrist pin bearings packed and sealed with grease.

Abstract: A device for pivotal connection of piston (1) and connecting rod (10) in a reciprocating-piston engine comprises a connecting member (6) integral with the piston, with a bearing surface (9) for a connecting-rod eye (11), which together with the bearing surface (9) forms the pivot bearing of the connecting rod (10) on the piston side; the connecting member (6) is provided at least in the region of the bolting with planar contact faces (7), which together with mating faces (8) on the inside of the piston form a common dividing plane (13); the connecting member (6) is fixed on the side of the piston (1) facing away from the combustion chamber by means of one or more connecting bolts (4) passed through bores in the piston head (2); the bearing surface (9) is much broader toward the straight portion (10) of the connecting rod than on its side facing the piston (10).

Abstract: A hydraulic piston for a cylinder block of a hydrostatic power unit has an elongated cylindrical body with first and second ends. An elongated cavity is formed in the body. A cap is adhered to the body to close the cavity. The cap has an external shape to facilitate the operative engagement thereof with a slipper, which is in subsequent engagement with a swashplate mounted adjacent the cylinder block. The piston has an elongated first conduit formed in the body which is separate from the cavity and extends between the opposite ends thereof. The conduit terminates in registering communication with a second conduit in the cap thereof to permit transmission of oil through the conduit without invading the volume of the cavity. The cap preferably has a tapered surface on the inner end thereof engaging a compatible shaped surface on an adjacent end of the body to center and align the cap with the body.

Abstract: A reciprocating compressor (K1-K3) comprising a connecting rod (21) in which a small end portion (22) having a small hole (22a) and a large end portion (25) having a large hole (25a) are coupled with each other; wherein the small end portion (22) is coupled with a piston (24) by a piston pin (23) loosely fitted into the small hole (22a), while an eccentric shaft (7a) of a crank shaft (7) is loogely fitted into the large hole (25a), wherein the large end portion (25) is formed with a cylindrical bore (25b) having an axis passing through a center of the large hole (25a) and a fixing hole (25c, 28, 30) communicating with the cylindrical bore (25b); wherein after a cylindrical distal end retaining portion (22c) of a rod portion (22b) of the small end portion (22) has been loosely fitted into or lightly press fitted into the cylindrical bore (25b), not only the cylindrical distal end portion (22c) is fixed in the cylindrical bore (25b) by inserting a locking pin (26) into the fixing hole (25c, 28, 30) while a smal

Abstract: A displacement pump has a rotatable drive shaft and at least one piston containing a piston cavity, and a piston shoe flexibly connected with the piston. The piston shoe comprises a shoe passage fluidly connected with the piston cavity. The displacement pump also has a hydrostatic thrust bearing plate comprising at least one thrust pad, and a driveplate connected with the drive shaft and disposed between the piston shoe and the thrust pad. The driveplate comprises a bearing surface proximate to the thrust pad, a pumping surface proximate to the piston shoe, and at least one communication port fluidly connecting the bearing surface with the pumping surface. The driveplate is rotatable to a position in which the piston cavity is fluidly connected with the thrust pad via the shoe passage and the communication port.

Abstract: A closed cavity piston assembly includes a piston body, a separately formed piston cap sealingly joined to the body, and an elongated stem integrally formed with one of the piston body or the cap. In one embodiment, the stem is integrally formed with the piston body. In another embodiment, the stem is integrally formed with the piston cap and slidably journaled in and sealed to a hole in the bottom of the piston body. The cap of the piston assembly also has a surface for engaging a slipper. In either case, a fluid passageway extends through the stem, body, and cap of the piston assembly. The passageway is remote from the side wall of the piston body and fluidly isolated from the main interior cavity of the hollow piston body once the cap and body are sealingly joined together. The piston assembly can be pivotally attached to a slipper that has its own fluid passageway, which registers with the passageway in the cap, to provide fluid for slipper lubrication and balance.

Abstract: The invention relates to a piston for a hydrostatic machine and a corresponding production method. In a conventional production method of this type, the piston is shaped from a blank into a shank section and a ball and socket joint section connected to the shank section by means of a neck section. According to the inventive embodiment, an additional blank for an inner tube is inserted into the blank of the outer tube before the latter is shaped. A hollow piston comprising one or more hollow chambers between the inner and outer tubes is formed after both blanks have been shaped.

Abstract: This invention relates to a hydrostatic axial piston machine that utilizes a swash plate construction with a plurality of axially movable pistons mounted in a cylinder drum. The pistons are each supported on a slide face by individual sliding blocks and are hydrostatically compensated. Each sliding block has a sliding block plate facing the slide face, and is in communication on the side opposite the sliding block plate with a piston. A sealing web is formed on the sliding block plate and the sliding block is provided with a bore that leads from the piston side to the slide face side. The sealing web on the sliding block plate of the sliding block is realized in the form of a substantially concave surface. In one configuration, the concave surface, starting from an outside periphery of the sliding block, extends substantially to the vicinity of the bore.

Abstract: A device including a first moving part such as a piston (1) and a second moving part such as a connecting rod (2) with a coupling part (4) therebetween. A low-pressure compressible liquid lubricant feed system delivers a liquid into a chamber (10) with a variable volume between the second part and the coupling part, to form a pump supplying the joint interstice (16) to be lubricated, by a one-way connection (13, 15) and a resilient return member (11), wherein the interstice communicates with a cavity (17) with a fixed volume used as a liquid lubricant source. The volume, in relation to the pump displacement, enables a degree of deflection of the pump piston (3) while achieving a sufficiently high pressure and compensating for leakage.

Abstract: A piston, which reciprocates in a cylinder bore of an engine, is supplied with lubricating oil. The piston includes pin bosses provided under a piston head, a symmetrical pair of skirts, and side walls connecting the pin bosses and the skirts. The side walls have openings, which communicate the outer side of the walls with the inner side of the walls under the middle section of the head. A recess is defined in the lower surface of the head to receive a spray of lubricating oil. The width of the recess is wider than the width of each skirt at its basal portion. This causes the oil supplied to the lower surface of the head during movement of the piston to be injected against the recess and thus be diffused. As a result, oil passes by the basal section of the skirts and permeates into the space defined by the cylinder bore and the skirts.

Abstract: A reciprocating piston gas compressor driven by an integral internal combustion engine is disclosed. The compressor may be used as an air compressor but has particular application for compressing natural gas from natural gas wells. It has few moving parts. The compressor has a reciprocating assembly, one end of which functions as the piston in an engine and the other end of which functions as the piston in a compressor. Motion of the assembly is regulated by a crankshaft. The crankshaft is connected to the reciprocating assembly by a linkage having arms which pass on either side of the assembly. The crankshaft preferably extends through a slot in the reciprocating assembly. Several compressors may be combined to make a multi-stage compressor.

Abstract: A number of embodiments of piston pin piston connections and lubricating arrangements for lubricating the piston pin. The piston pin connections are such so as to minimize localized wear on the piston. The lubricating arrangement is configured so as to deliver lubricant toward the piston pin and piston for cooling.

Abstract: Spherical joint connecting rod holder rings. The holder ring is formed in two halves which define a socket in which a spherical small end of the connecting rod is retained. The ring further includes a vertical wall which acts as an oil dam to retain oil in a piston cooling gallery. One or more drain holes are formed in the ring to drain oil from the cooling gallery back to the engine crankcase. Futhermore, one or more grooves are formed in the socket surface in order to channel oil into the socket for lubrication of the spherical small end.

Abstract: An apparatus and method is provided for producing a piston assembly for use in a fluid translating device such as a hydraulic pump or motor. In the subject arrangement, a piston is provided having a cavity at one end thereof and a slipper having a spherical head portion which is precisely positioned within the cavity to provide a space therearound and subsequent thereto a plastic material is formed in the space to maintain the spherical head portion in the cavity. This arrangement eliminates the sliding friction that exists in other piston assemblies and furthermore reduces the precise sizing of the cavity relative to the spherical head portion.

Abstract: An assembly including a piston having a crown surface, a bottom surface, and a skirt projecting therefrom and defining therewith a cavity; a cup-shaped housing retained in the cavity and having a bottom wall engaging the bottom surface and a side wall engaging the skirt; a collar retained within the housing and defining an annular concave surface facing the bottom surface; a connecting rod having a transversely projecting end portion defining an annular convex surface engaging the concave surface and an axially outwardly facing recess defining a slide surface; and a slide member retained in the recess and slidably engaged between the slide surface and the bottom wall.

Abstract: A conjugate drive mechanism of a scotch yoke type motion converter includes a conjugate driver, which is rotatably mounted on a crankpin, and a bearing conjugate, which is mounted on a linearly movable shuttle. The conjugate drive mechanism is lubricated by supplying lubricating fluid from a pressurized source to an interface between meshing portions of the bearing conjugate and the conjugate driver.

Abstract: An internal combustion engine has at least one piston (15, 16) which moves back and forth in a cylindrical piston bore (13, 14) and drives a rotationally supported crankshaft (30) through a connection rod (24, 25). The piston bore (13, 14) is arranged in a rotary element (10) rotationally supported in a housing (1). The rotary element (10, 17) and crankshaft (30) are cinematically coupled through a gear (40, 41, 42, 43) so that they can rotate in opposite directions (60 or 61). The piston bore (13, 14) arranged in the rotary element (10) communicates with an opening (20, 21) in the outer surface of the rotary element (10, 17) which moves past an inlet opening (50) and an outlet opening (51) in the housing (1) during rotation of the rotary element (10).

Abstract: A piston for an internal combustion engine has a crown and peripheral wall to carry a piston ring. A support extends between the wall and a bearing housing to receive the connecting rod. A cylindrical support member also extends from the wall around the support to a skirt. The support member is radially inset from the wall and a cylindrical bearing member is located on its radially outer surface.

Abstract: A connecting rod for connecting a reciprocating piston to a rotating crankshaft of an internal combustion engine includes an improved lubrication distribution system for conveying lubrication into its crankpin bearing. The lubrication is distributed by means of a pair of radial bores one of which extends through the cap of the crankpin bearing and the other of which extends through an arcuate-shaped crankpin bearing portion integrally formed at the end of the connecting rod. The bores are located diametrically opposite one another, and each bore includes an outlet opening into the crankpin bearing hole. The outlets are oval in cross-section and have chamfered sidewalls with an angle of between 30.degree. to 60.degree. with respect to the bore.

Abstract: A spherical joint and bearing assembly utilizes a ball and socket arrangement between a connecting rod and a crosshead in a power reciprocating fluid pump. The connecting rod is spherically shaped and is held in a thrust bearing having a matching interior surface. A split retraction ring is held between the rear portion of the sphere and a shoulder in the crosshead. The result is an increased bearing surface and reduction in misalignment.

Abstract: A method of manufacturing a piston for hydrostatic axial and radial piston machines by non-machining forming, by filling a material that is in a substantially unresistant, formable state into a mold defining a piston outer contour which is closed on all sides, in which at least one supporting core is arranged spaced from the inner contour of the mold to remain in the completed piston to define a core region in the interior of the piston that is closed on all sides, then solidifying the material forming a piston with high strength characteristics and low weight, and removing the completed piston with the enclosed supporting core.

Abstract: In a radial piston engine having pistons bearing against the circumference of an eccentric, which pistons execute a swivelling motion upon the rotational motion of the eccentric and are in engagement with a guide body, which bears on the radially outer end by a radially outwardly convex spherical-annular bearing face against a concave spherical-annular bearing face in the housing or cylinder cover. To attain complete piston relief, the bearing arrangement is designed such that the guide body (2) is provided with an upper end face (8) which is acted on by the pressure medium over a hydraulically effective plane (de) extending perpendicularly to the longitudinal axis of the guide body (2). The hydraulically effective plane lies in the area of the bearing face (5) on the housing (6) or intersects the face for all swivelling positions of the piston (3).

Abstract: The crank mechanism of the piston compressor comprises individual crank disks (5), which each support on their outer circumference a rolling bearing (6) for the bearing of a connecting rod (4). The crank disks (5) are pressed together to form a package by means of tensioning bolts (7). The crank case (1) is preferably closed off by a case cover (10), the inside of which is formed as a bearing mount for the crank mechanism. Assembly and disassembly of a crank mechanism of this type is particularly simple and efficient and can be undertaken by personnel who are not specially trained. In addition, special relubrication devices provide simple and error free servicing, and thus greater longevity.

Abstract: An arrangement wherein a concave portion on a support end of a connecting rod is slidably engaged with a convex portion formed in a lower part of a piston, and a retainer ring member supported on a skirt portion of the piston is placed in contact with the lower part of the concave rod end.

Abstract: 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 through a unique methodology of bearing retention against axial and rotational movement. The interior bearing geometry is formed of radii equal to that of the piston pin which are offset vertically into the upper and lower bearings and of radii of nonspecific size which are offset horizontally. The bearings are retained against movement through connections with the piston head, the piston skirt, and between the various bearing pieces. Means are also provided for feeding oil under pressure to the piston pin and bearing interface for lubrication and to the piston assembly for cooling.

Abstract: When a first rotating shaft is rotationally driven, it rotates a first cylinder barrel splined thereto, and a second cylinder barrel and a valve block united with the first cylinder barrel. In accordance with these rotations, first pistons in first cylinders slide circumferentially on the inclined face of a first swash plate so that they are reciprocated axially in the first cylinder barrel, and second pistons in second cylinders slide circumferentially on the inclined face of a second swash plate so that they are reciprocated axially in the second cylinder barrel. Simultaneously with these reciprocations, a first change-over valve is switched in accordance with the rotations of the first rotating shaft, and a second change-over valve is switched in accordance with the relative rotations of the first rotating shaft and the second rotating shaft.

Abstract: A connecting rod having lubricating passages therein for cooling the piston assembly of a compressor. A central lubricating passage provides fluid communication between the crankshaft end portion and piston end portion of the connecting rod. The central lubricating passage conducts lubricant on the wrist pin, thus directly lubricating the wrist pin. The connecting rod also includes a plurality of branched passages branching from the central lubricating passage and extending through the piston end portion closely adjacent the wrist pin. Each of the branched passages is oriented to spray lubricant on the inner surface of the piston. Thus, the branched passages indirectly cool the wrist pin by drawing heat away from it and directly cool the piston by spraying lubricant thereon.

Abstract: The present invention is an improved lubrication system for a connecting rod, wrist pin, and piston of a compressor. An oil pump pumps lubricating oil upwardly within an axial bore of the crankshaft, which includes a radial passageway in alignment with the connecting rod. The connecting rod includes ports which direct pulses of oil onto the inner surfaces of the piston. The ports are separated by barrier segments to allow local oil pressure to build between the sequential alignments of the passageway and a port. Thus, pulses of oil are accurately sprayed onto the piston inner surfaces without substantially diminishing the lubrication of the journal bearings.

Abstract: There is provided a connecting rod for connecting a crank pin of an electric motor to a reciprocated piston. The connecting rod includes a sheet metal shaped member that at each end has a deep drawn cylinder mounting which in turn mounts a bushing that is of a greater axial length than the cylinder mounting. The shaped member has a longitudinal bead providing a depression extending adjacent to one of the mountings and terminate in spaced relationship to the other mounting whereby there is a planar surface extending transversely across the member longitudinally between the bead and the other mounting and adjacent to the widest part of the member to provide a bending line.

Abstract: The space within the interior cavity (7) of the piston (1) limited by the partially spherical head (5) of the connecting rod (6) is filled with a viscous, pasty or plastically ductile fluid (13), practically incompressible at the operating temperatures and pressures of the piston (1), the diameter (D) of the cylindrical support (8) which limits laterally the cavity (7) being very slightly greater than the diameter (d) of the partially spherical head (5) of the connecting rod (6) so that the clearance during operation between said support (8) and said head (5) is sufficiently minor to prevent any leakage of said fluid (13) from said space at the operating temperatures and pressures of the piston.

Abstract: 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 piston and having a piston rod shaft, a turning member mounted on the piston rod and having a side which is opposite to the piston rod shaft and has a convex circular surface, a pressing member having a shell surface which is in sliding contact with the circular surface of the turning member, the pressing member having a side which is opposite to the turning member and is provided with a convex circular surface abutting against the inner surface of the piston bottom, the circular surface of the pressing member and one of the circular surfaces of the turning member and the shell surface of the pressing member having central axes with central axes projections along their common orthogonals forming an angle of approximately 90.degree..

Abstract: In a pivot bar portion of a piston shoe in a radial piston device wherein the pivot portion is pivotably borne in a bed in the piston which extends normal to the longitudinal axis of the piston, recesses are provided parallel to the pivot axis whereby bearing lands are formed between the recesses. The bearing lands are tracting fluid out of the recesses along themselves and the bearing bed face of the piston, when the shoes pivot in the piston. A perfectly operational forced lubrication between the pivot portion and the piston is thereby assured which results in a long life and very high bearing capacity between the piston and the piston shoe.