Abstract: A braking system includes a brake booster with a power piston assembly structure defining a guide bore which possesses an open end, the guide bore defining a bore axis. A pivot structure is positioned in the guide bore and including (i) a body having an interior surface that defines a cavity, and (ii) a plurality of extensions protruding inwardly from the interior surface. A pedal rod includes (i) a ball-shaped distal end portion is retained in the cavity by the plurality of extension members, and (ii) a shaft extending from the ball-shaped distal end portion. A retainer is secured to the power piston assembly structure so as to prevent advancement of the pivot structure through the open end of the power piston assembly structure. The retainer defines a frusto-conical passageway through which the shaft extends enabling the shaft to pivot.

Abstract: A single-piece piston body for an internal combustion engine includes a crown portion having a circumferential ring belt including an oil ring groove configured to accommodate an oil control ring and a skirt portion having a first skirt wall disposed on the major thrust side and a second skirt wall disposed on the minor thrust side of the piston, and two box walls that connect the skirt walls and which are set back with respect to the ring belt. A first plurality and a second plurality of axial drain passages extend from the oil ring groove to the bottom of the crown portion, the first and second pluralities of axial drain passages being substantially centered at opposite box sides of the piston and each plurality of axial drain passages spanning an arcuate portion of about 45-75 degrees.

Abstract: A reciprocating pump assembly has a pump within a housing. The pump has a crankshaft that rotates and a crosshead that is connected to a plunger via a pony rod. The plunger pumps fluid through cylinders in the pump. A connecting rod connects at one end to the crankshaft and at another end to the crosshead to translate the crankshaft's rotational movement into linear movement of the crosshead and thereby the plunger. The end connected to the crosshead is secured to the crosshead by a bushing located within the crosshead that allows the connecting rod end to pivot during operation. The bushing extends more than 180 degrees, retaining the connecting rod with the crosshead without the need for a wrist pin. The end secured by the bushing can be retained within the bushing by a lock plate, and retainers without the need for a wrist pin.

Abstract: An object of the present invention is to provide a wobble plate compressor equipped with a mechanism for preventing the rotation of the wobble plate which is simply structured, producible at low cost, and does not cause heavy noise or vibration. A wobble plate compressor comprises a main shaft driven by a power source, a wobble plate driven by the main shaft to swing, a piston connected to the wobble plate by a connecting rod, and a cylinder bore extending parallel to the main shaft to accept the piston. The connecting rod is connected to the wobble plate by a ball joint, precession of the connecting rod is allowed when the piston moves reciprocally, and the outer circumferential surface of the piston is forced against the inner circumferential surface of the cylinder bore when the wobble plate is driven by the main shaft to rotate and the connecting rod is driven by the rotating wobble plate to swing beyond the range of the precession. Thus, rotation of the wobble plate is prevented.

Abstract: While ceramic materials possess properties that make them suitable for use in fuel system components, they tend to be susceptible to failure when exposed to tensile stresses. The retention system described herein helps to reduce the tensile stresses experienced by a retained member by providing a retained member with an engagement structure, a multi-piece retention ring that engages the engagement structure, a resilient member coupled to the retention ring, and a retainer coupled around at least a portion of the retention ring and resilient member and spaced apart from the retention ring and/or resilient member by a gap. The retained member, retention ring, resilient member, and retainer are configured so that the retention ring is moveable in an axial direction relative to the retained member and so that the movement of the retention ring acts to expand the resilient member against the bias provided by the resilient member.

Abstract: A piston assembly for a hydraulic machine is formed with a part spherical cavity in the piston to receive a spherical bearing of a slipper assembly. The spherical bearing is secured in the cavity by swaging the walls of the piston and subsequently working the wall to provide a clearance to allow relative rotation.

Abstract: The invention concerns a piston arrangement having a piston with a piston head and a piston skirt with a circumferential surface, and a connecting rod, which is connected with the piston via a ball joint comprising a ball, and penetrated by an oil supply channel, which is connected with a bearing surface of the ball joint.

Abstract: A master cylinder for the clutch or brake of a motor vehicle has a housing for a reciprocable piston one end of which receives the spherical head of a reciprocable piston rod. The head is held in a desired position relative to the piston by a one-piece or composite coupling device having a first section exerting a pull or bearing upon the head of the piston rod and a second section which is confined in or surrounds the end of the piston and urges the first section in a direction to hold the piston rod against axial movements relative to the piston. The coupling device and/or the piston are or can be made of a plastic material, and the connection between such parts is or can be established by snap action.

Abstract: A brake booster having an input element (20) for actuating the brake booster is described. The input element (20) at its end facing a brake pedal has a receiving sleeve (20A) for an actuating rod (34), which is to be coupled to the brake pedal. Disposed inside the receiving sleeve (20A) is a spring sleeve (36) comprising at least one spring element (36C, 36D), which cooperates with the actuating rod (34) when the latter is brought into a detent position in relation to the input element (20). The spring element (36C, 36D) extends substantially in axial direction and is actuable in a spring-elastic manner in a radially outward direction. The spring sleeve (36) at its brake pedal-side end has a radially outwardly extending portion (36F), which is fastened by means of a bead (20D) of the receiving sleeve (20A) to the receiving sleeve (20A).

Abstract: A piston for use in the cylinder block of a hydraulic power unit. The piston has an elongated cylindrical body with one end configured to connect with a slipper element. The second end of the piston is open with an annular cavity in the piston body defining an elongated stem extending from the head end of the piston and slightly protruding through the open end. The stem is concentrically located within the longitudinal axis of the annular cavity and has an elongated fluid conduit that extends longitudinally through the stem and completely through the piston. The fluid conduit traverses the piston body along the center axis, providing a path for pressurized fluid. The piston is composed of a unitary cast construction.

Abstract: A master cylinder for the clutch or brake of a motor vehicle has a housing for a reciprocable piston one end of which receives the spherical head of a reciprocable piston rod. The head is held in a desired position relative to the piston by a one-piece or composite coupling device having a first section exerting a pull or bearing upon the head of the piston rod and a second section which is confined in or surrounds the end of the piston and urges the first section in a direction to hold the piston rod against axial movements relative to the piston. The coupling device and/or the piston are or can be made of a plastic material, and the connection between such parts is or can be established by snap action.

Abstract: A dashpot piston in halves, the face of each resting against that of the other. The piston can be fastened to the end of a piston rod either directly or by way of a connector. Each half (1 & 2) is provided with a depression (7) along the circumference remote from the face of the other, creating a continuous groove (8) with a shorter diameter and accommodating a piston-assembly ring (9). Manufacture is facilitated by the inclusion of at least one resilient supporting ring (11) between the piston-assembly ring and the base of the groove.

Abstract: In a piston and connecting rod assembly, for an internal combustion engine with a spherical connecting rod small-end entrained in a hollow piston body by a retention ring, a chamber serving as a localized reservoir for lubricant and/or coolant (oil) is incorporated in the underside of a piston crown along with passages or grooves communicating between the reservoir and a coolant gallery in the piston crown for continuous interchange of lubricant (such as oil) between gallery and reservoir and then lubricant return, over small end (upper and lower) part-spherical bearing surfaces to the retention ring and through lubricant passages in the ring to an engine crankcase, thereby affording an overall circulatory, lubricant feed and drainage path.

Abstract: A master cylinder for use in a hydraulically actuated clutch or brake system of a motor vehicle, includes a casing formed with a bore, and a piston unit axially displaceable within the bore. The piston unit includes a piston-shaft sleeve received in the bore and having one end formed with a bottom to define an interior, at least two retainer shells received in the interior of the sleeve free of play, and a piston rod having a spherical head swingably mounted to the retainer shells and provided to respond to a manual actuation of a pedal. The retainer shells are each formed at a pedal-proximate end of the piston-shaft sleeve with a spherical recess to define a ball socket in which the spherical head snaps in and is received in form-fitting manner.

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: A master cylinder for use on a hydraulically actuated clutch or brake system of a motor vehicle, or for the like uses. The master cylinder comprises a cylindrical housing, and a piston which is axially displaceable along the housing, a piston rod in the housing. The piston rod is connected with the piston to be movable together free of play, but they are swingable with respect to each other, whereby the piston rod may swing with respect to the piston in the housing. The connection between the piston and the piston rod comprises a generally ball shaped head on the piston rod, which is held between partial shells in the housing which are shaped to partially surround and form lock to the piston rod head. The piston has a neck with receiving grooves in it. The partial shells have projections which engage in the grooves in the neck. A tubular piston-shaft sleeve in the housing is axially shiftable in the housing and is fastened to the piston.

Abstract: A rotary actuator device having an annular piston rod, the device comprising at least one piston held provided with sealing means and co-operating with an annular piston rod mounted so as to be capable of moving in an annular chamber, together with means for selectively applying a fluid under pressure in said annular chamber, wherein the piston head co-operates with the piston rod via a hinge having one degree of freedom in rotation and one degree of freedom in translation, said hinge comprising a piece in the form of a knife whose edge co-operates with a V-groove in a female portion of triangular profile, the knife edge and the V-groove being parallel to the axis of rotation of the piston rod. This disposition enables the forces exerted on the sealing means to be brought back into balance, thereby increasing sealing even under high pressures.

Abstract: A reduced impact piston assembly including a cylindrical body with a cavity formed therein and having a cross-bore formed therethrough which intersects the cavity. The cross-bore receives a piston pin which has an exposed intermediate portion aligned with the cavity for attachment of a connecting rod thereto. A wide groove is formed about the outer circumference of the cylindrical body which has its center aligned with the center of the cross-bore. Positioned within this groove are a pair of C-shaped inserts, the legs of which abut the ends of the piston pin to prevent axial movement of the pin within the cylindrical body. The C-shaped inserts cooperate with the pin to form a closed loop having a circumferential length which is larger than the circumferential length of the cylinder body. In addition, a portion of each of the C-shaped inserts is in constant contact with a cylinder wall.

Abstract: An improved device is disclosed for connecting a plunger to a connecting rod of the type having a crosshead connected to the connecting rod, the crosshead having a coupling element with a flange and a coupling nut mounted to the flange. The coupling element is provided with a centering bore and a thrust plate is mounted to the coupling element. The thrust plate has a first side with a centering stud extended into the centering bore and an annular shoulder surrounding the centering stud seated against the flange. The thrust plate has a recess on a second side opposite the first side for receivingly centering an end of the plunger. A clamping assembly for clamping the coupling element includes a collar threadably engaged to the coupling nut.

Abstract: A piston shoe for fluid pressure pump motors of the piston type is substantially disc-shaped and includes a concave portion provided upon one end face thereof for seating the convex portion of a piston rod associated with the piston and cylinder assemblies of the pump motor, while the other end face thereof is substantially flat for contacting the sliding surface of a swash plate. A holder or retainer is also provided in association with the shoe for retaining the piston rod within the concave seat, such retainer being secured to the shoe by biasing means, or alternatively by being pressed or crimped thereon.