Abstract: A piston with a centrally located recessed area around the outer wall for containing oil on a continuous basis during engine operation. The recessed area is provided with apertures in fluid communication with passageways in the wrist pin, connecting rod, and crank shaft. An oil pump directs oil or lubricant through the passageways to the recessed area during engine operation for lubrication and prevention of compression loss. A heat resistent elastomeric oil ring is provided on the side wall of the piston above the recessed area for prevention of oil flow upwards toward the head of the piston.

Abstract: A refrigeration gas compressor comprises a piston reciprocably movable to effect gas compression, a motor-driven rotatable crank shaft, and a connecting rod between a crank shaft, crank pin and a piston wrist pin. A crank pin receiving hole and a wrist pin receiving hole in the connecting rod are connected by an oil passage. The crank pin has two lubricating oil supply ports at opposite sides of its outer surface through which lubricating oil is pumped. A bearing assembly comprising semi-circular upper and lower bearing sections is disposed around the crank pin. The upper bearing section has wedge-shaped oil well recesses at opposite ends of its inner surface which receive oil from the oil supply ports. The upper bearing section also has two oil feed holes therethrough for supplying oil from the wells to a groove in the crank pin hole side wall adjacent the upper bearing section.

Abstract: The piston pin for a piston of an internal combustion engine is provided with a certain number of passages, each opening into the annular groove of the bearing bushing of the connecting-rod small end and into either of the annular grooves of the pin bearings. The passages are provided in a peripheral portion of the piston pin so to avoid a central portion of the pin, in which a concentration of metallic impurities is maximum.

Abstract: A hydrostatic radial piston pump has a housing with a suction chamber, an eccentric, a pressure valve member spaced from the eccentric and having a convex support, and a movable structural unit arranged between the eccentric and the pressure valve member and including a cylinder with a supporting face and a sealing edge spring-biased against the support of the pressure valve member, and a piston with a piston shoe spring-biased against the eccentric, wherein the supporting face has a circumferential groove subdividing it into an outer and inner annular face portion, the outer annular face portion has at least one substantially radial groove communicating the annular groove with the suction chamber, and the ratio of the force of a biasing spring and the dimension of the supporting face does not exceed substantially 2.5 kp/cm.sup.2.

Abstract: A cylinder lubrication system for a combustion engine. The lubricant is directed to the cylinder wall through a piston moving in the cylinder. The piston comprises a piston pin above which there are a plurality of piston rings sealing a combustion chamber at the top side of the piston. There is a lubrication groove in the outer mantle surface of the piston between the piston pin and at least a majority of the piston rings, preferably all of the piston rings. The lubrication groove is open in a direction outwardly from the piston and has lubricant feed ducts connected thereto from the inside of the piston. In the feed ducts the lubricant is subject to continuous pressure when the engine is continuously running.

Abstract: A connecting rod assembly for a two-stroke cycle reciprocating piston internal combustion engine has the piston pin axis slightly skewed from the crank-shaft axis to provide favorable conditions for lubricating the piston pin.

Abstract: A high-pressure pump has a housing whose cylindrical chamber is subdivided by a piston into a fixed-volume compartment and a variable-volume compartment. An orbital crank is connected via a connecting rod to this piston to reciprocate it in the housing and thereby cyclically increase and decrease the volume of the variable-volume compartment. This variable-volume compartment is connected via a downstream conduit and a checkvalve to a supply of liquid lubricant, and to an upstream conduit and an upstream checkvalve both to the fixed-volume compartment and to the joints or bearings at the end of the connecting rod.

Abstract: A ball and socket joint and method of making in which a piston, especially a compressor piston, and most particularly a piston for a compressor that pumps refrigerant, has a top wall and a depending skirt and is connected to the upper end of a connecting rod by a ball joint which is made by forming a spherical socket in the upper end of the connecting rod and riveting a ball to the underside of the top wall of the piston and forming the upper peripheral region of the socket of the connecting rod around the upwardly facing side of the ball. In practice, the ball is placed in the socket of the connecting rod and the rod is formed about the ball and then the ball is riveted to the piston.

Abstract: A seal for use within the interior portions of a piston, primarily on a diesel engine which has a pressurized oil supply which is forced upwardly through the connecting rod and sprayed on to the upper portion of the piston. The seal substantially closes the area between the connecting rod and the interior sidewalls of the piston skirt. The oil is thus restricted in flow, building up pressure within the top portion of the piston and causing the oil to contact the upper interior portion for cooling the piston and further, forced to lubricate the bushings on the wrist pin.

Abstract: An air compressor utilizing one or more pistons reciprocating within water cooled cylinders and operating in an oil free environment. Each piston is reciprocated by rotation of motor driven, balanced rotors, through a reciprocating and oscillating shuttle member. A centrally sleeved, hollow ball, accommodates shuttle member movement, while interconnecting the shuttle member and the rotors. Positive lubrication is provided for the rotor bearings, the hollow ball and shuttle member and the reciprocating piston shafts. The rotors are driven in opposite directions by motors mounted to maintain constant torque on the rotors.

Abstract: A seal for use within the interior portions of a piston, primarily on a diesel engine which has a pressurized oil supply which is forced upwardly through the connecting rod and sprayed on to the upper portion of the piston. The seal substantially closes the area between the connecting rod and the interior sidewalls of the piston skirt. The oil is thus restricted in flow, building up pressure within the top portion of the piston and causing the oil to contact the upper interior portion for cooling the piston and further, forced to lubricate the bushings on the wrist pin.

Abstract: A motor or processing machine, such as a lowspeed radial piston motor, having a piston with a socket formed therein operatively contacting a ball formed on one end of a piston rod, to form a ball-and-socket joint with articulated movement, and a shoe on the other end of the piston rod, adapted to glide on a rotating element of the machine, such as a crankshaft eccentric, in which the entire piston rod is formed from a bronze-base bearing metal, such as steel bronze. At least the shoe of the piston rod may be coated with a thin, soft run-in layer, such as tin, and a pocket may be formed in the shoe of the piston rod to provide hydrostatic relief.

Abstract: An improved lubrication system in a pump including a blocking rod mounted between seats on the pump frame and the swash plate, the rod having a channel therethrough from one seat to the other and a fluid conduit coupling the channel to a source of lubrication fluid at the seat on the pump frame. Each piston is connected to the swash plate by an axial connecting rod and the swash plate is provided with internal conduits coupling each rod seat on the swash plate to the swash plate blocking rod seat to provide lubrication to the connecting rods. Each connecting rod can also be provided with an internal channel to conduct fluid to its seat at the piston end.

Abstract: A radial piston machine has a rotor which turns within the confines of a surrounding annular control face and is provided with substantially radial cylinder bores each accommodating a radially slidable piston having an outer end provided with a piston shoe formed with guide portions projecting circumferentially of the rotor beyond the associated piston and having contact faces which are in sliding engagement with the control face. Each of the contact faces has a hydrostatic bearing constituted by a depression surrounded by a sealing land, and recesses are formed in the respective contact faces outwardly spaced from the sealing lands, so as to separate the latter from outwardly adjacent portions of the contact faces.