Abstract: A rotary cylinder apparatus which prevents a fluid from leaking from a contact portion of a piston and a cylinder member and consequently enables efficient rotation. The rotary cylinder apparatus comprises: a rotary cylinder member 2 which has cylinder chambers 22 and 23 formed thereto so as to pass through a rotary shaft center O and rotates around the rotary shaft center O; pistons 3 and 4 demonstrating reciprocating linear motion in the cylinder chambers 22 and 23; a piston holding member 5 which holds the pistons 3 and 4 and rotates around a rotation center X eccentric from the rotary shaft center O of the rotary cylinder member 2; and a casing 6 which rotatably supports the rotary cylinder member 2 and has at least one inlet 61 and at least one outlet 62, wherein the pistons 3 and 4 are rotatably supported at a position away from the rotation center X of the piston holding member 5 by a fixed distance and with that position at the center thereof.

Abstract: A compressed fluid driven downhole cam motor (1) of the type used during drilling/service operations in the ground, comprising an intermediate casing (4), a distributing valve (26), a rotor (18) and two or more pistons (48) arranged radially and distributed with equal or unequal separation about the central axis of the rotor (18), whereby the pistons (48) located in the same radial plane constitute a set of pistons, and where two or more sets of pistons are arranged side by side along the longitudinal axis of the rotor (18).

Abstract: The fundamental approach of the present invention is to dispose bushes, in which pistons of a pumping apparatus for a vehicle brake system are movably disposed, in such a movable manner that they themselves may in dependence upon movements of the pistons act as pistons in order to supply brake fluid to the vehicle brake system. In particular, the bushes, whose pistons are pumping brake fluid into an associated brake circuit, do not act as pistons. On the other hand, brake fluid is fed back into a brake circuit by bushes, whose pistons are pumping substantially no brake fluid into the brake circuit but are taking in e.g. brake fluid removed from the vehicle brake system in order subsequently to pump it back into the brake circuit.

Abstract: In an electromagnetic valve, a composite valve case has a cylindrical hollow and a composite valve body formed in spool shape is slidably housed in the cylindrical hollow. The composite valve body has not only an inherent valve function for changing fluid path area according to its movement in the cylindrical hollow but also an armature function for constituting a magnetic circuit. The composite valve case has not only a cylinder function for allowing the valve body to slidably move but also a stator function for constituting a magnetic circuit. The composite valve body and the composite valve case are made of soft magnetic material and are provided at their surfaces with thin hardened layers formed by surface or heat treatment.

Abstract: A pump assembly for mounting a high-pressure oil pump on an internal combustion engine where the pump in the assembly is mounted in a closed chamber and a solenoid controlled valve is mounted outside of the chamber.

Abstract: A reciprocating compressor provided with a plurality of gas compression means having a cylinder and a piston. The piston of each gas compression means is cooperated with the compressor by converting a rotating motion of a crankshaft provides on an electric drive source to a reciprocating motion by a scotch yoke mechanism. A cylindrical attachment portion of a flywheel has an outer diameter corresponding to an inner diameter of a rotor shaft hole of the electric drive source, and the cylindrical attachment portion of the flywheel is inserted into the rotor shaft hole to contact with a lower end surface of the crankshaft. The fly wheel may be fastened to the crankshaft via a fastening bolt.

Abstract: The radial piston pump possesses a pump housing in which a plurality of cylinder bores are provided having pump pistons placed therein which can be driven by a cam. Further, an arrangement is provided in each pump piston (3) wherein the inlet or the outlet, or both the inlet as well as the outlet of the fluid in each cylinder bore, is controlled.

Abstract: A radial piston machine, e.g., a radial piston pump, in which an eccentric, rotatable on a stationary axle, drives multiple radially arranged pistons via an external sliding ring. Since a pump of this type operates with intake regulation, the delivery chambers are only partially filled above a middle speed range. Therefore, pressure surges, which cause noises, arise upon the impact of the piston on the oil volumes to be pushed out. These pressure surges may be reduced if a flexible circlip is positioned between the external sliding ring and the eccentric. Such a circlip allows the piston to deflect slightly together with the external sliding ring at the beginning of the pressure stroke, so that pressure peaks are suppressed and the noises are reduced. The flexibility of the circlip is increased using openings, which are positioned along the central axis, i.e., in the plane of the piston axle.

Abstract: The invention relates to an arrangement in a pump block. The pump block includes a plurality of pump valves each connected to a piston in a piston pump. The pump block also includes an inlet pipe which is common to all of the pump valves. The inlet pipe has a connection to each pump valve. One connection between the inlet pipe and the pump block is fixed and includes a flange fixedly screwed in the pump block, the remaining connections are movable in the longitudinal direction of the inlet pipe. The movable connections each include a flange with over-dimensioned boltholes in which a spacer is placed.

Abstract: In a piston pump for providing high-pressure fuel in a common-rail fuel injection system including a camshaft (2), which is mounted rotatably in a pump housing (1) and which has at least one eccentric cam 93) for operating a pump piston (4, 14) in an approximately radial direction with respect to the camshaft (2), in order to reduce the wear of the piston pump, a piston-rod element (6, 16, 26, 36, 46) is arranged between each pump piston (4, 14) and the eccentric cam (3) so as to transmit the stroke movement (5) and the force from the eccentric cam of the camshaft (2) to the pump piston (4, 14) by a rolling movement.

Abstract: A pump, pump components and method for pumping high pressure fluid with an unobstructed inlet passage during return strokes of the piston and an improved near spherical interface between a piston and a slipper.

Abstract: A camshaft has a cam having a circular profile. A cam-ring is rotatably arranged on a radial outside of the cam. The cam-ring orbits around the cam. The cam-ring has a metal bush on an inner surface thereon. The cam-ring rotates relative to the cam, but is prevented from a rotation itself. The cam has a groove inclined with respect to a rotating axis of the cam. The groove has openings on both axial ends of the cam. The groove introduces fuel as a lubricant into a gap between the cam and the metal bush. The fuel introduced into the gap improves a lubricity and prevents a sticking.

Abstract: The invention relates to a pump assembly for a hydraulic brake system with traction control, having an electric motor and a piston pump. To reduce a bearing load, the invention proposes rotatably supporting and thereby radially bracing a motor shaft, or an eccentric sleeve pressed onto the motor shaft, on both sides of pump pistons. To economize on installation space, a pump bearing is disposed in an end of the eccentric sleeve that protrudes past the motor shaft.

Abstract: A compact hydraulic supply unit has a housing forming a reservoir for a pressure fluid, and includes a housing bottom, a housing cover and a housing middle part therebetween in the form of a profiled tube. An electric motor has a laminated stator core held by the housing middle part, and drives a pump located at the housing bottom. The housing middle part has axially extending internal holding Webs for holding the laminated stator core. The size of the housing middle part is independent of the size of the electric motor, so that, with a low structural height, the housing can be so formed that it accepts a larger volume of pressure fluid.

Abstract: A reciprocating compressor provided with a plurality of gas compression means having a cylinder and a piston, the piston of each gas compression means is cooperated with the, compressor by converting a rotating motion of a crankshaft provided on an electric drive source to a reciprocating motion by a scotch yoke mechanism, wherein an increase of the volume of discharged gas can be achieved without designing a gas compression means to be wide or without increasing the number thereof, a pulsation of discharged gas can be decreased by an attachment of an expression muffler on the cylinder head so as to decrease a vibration and noise of the compressor, an attachment of the fly wheel to the crankshaft and an adjustment of the shaft with the crankshaft can be improved easily, further compressed gas flows are joined and discharged in concentration, thereby the pulsation of discharged gas can be restrained.

Abstract: The invention is based on a radial piston pump (1) with a pump body (2), in which pump body (2) are placed pistons (4), and cylinders (5) arrayed radial to a cam (14) and the pistons (4) upon an inward thrust suck in fluid by means of suction side intakes (17) and upon an outward thrust, the pistons (4) impel fluid through pressure openings (7) in the outer end walls (6) of the cylinder (5) into a plenum (10). It is proposed, that in the base of the cylinders (4) respectively a connection boring (32) is made to the cam (14), which connection boring (32) is controlled by a relief valve (18). Upon the exceeding of its opening pressure the relief valve (18) opens and pressure peaks in the cylinder (5) can be diminished by means of said connection boring. At the same time, a pressure buffer between the base of the piston (4) and the bearing shell (16) is formed.

Abstract: The present invention relates to a motor-and-pump assembly including an electric motor and a piston pump, in particular for slip-controlled brake systems of automotive vehicles, wherein pistons of the pump are adapted to be driven by way of an eccentric, and the drive shaft of the electric motor and a support axle of the piston pump are separately designed, and wherein a three-ring bearing furnished with an eccentric intermediate ring is arranged on the support axle. According to the present invention, at least one counterbalance weight is provided in the proximity of the eccentric for the purpose of noise reduction and enhanced truth of running of the assembly.

Abstract: Three or more diaphragm pumps (12,14,16) are interconnected to sequentially receive an activation fluid from corresponding piston and cylinder pumps (18,20,22) synchronized by a control mechanism (24) which includes a distributor plate (42) with directive shallow slots (80,82,84) for conduiting activation fluid to a porting plate (44) and via openings (60,62,64) to the piston and cylinder pumps (18,20,22).

Abstract: Described is a radial piston pump with a pump housing (3), which has a plurality of cylinder bores (5) arrayed in star shape around a cam (4), for the reception of pistons (6) and possesses inlet (7) and outlet (8) when penetrate to each cylinder inner chamber (9) with a therein compressible working volume. In accord with the invention, each cylinder inner chamber (9) is provided with at least one relief opening, which connects the working volumes during a compression stroke of the piston (6) with a space of lesser pressure for the reduction of the pressure gradient and also thereby reducing the noise of the pump.

Abstract: The invention is based on a radial piston pump (1) with a pump body (2), in which pump body (2) are placed pistons (4), and cylinders (5) arrayed radial to a cam (14) and the pistons (4) upon an inward thrust suck in fluid by means of suction side intakes (17) and upon an outward thrust, the pistons (4) impel fluid through pressure openings (7) in the outer end walls (6) of the cylinder (5) into a plenum (10) whereby the check valves (22) are formed from an annular coil spring valve (9) which cover the pressure ports (7) and the thereto connected stress relieving corrugations (8), and upon the exceeding of a specified threshold transport pressure, the respective pressure opening (7) opens to the plenum (10). The proposal is made, that a stress relieving zone (27) of a piston-cylinder unit (4, 5) be connected to the pressure zone (5, 7, 26) of a neighboring piston-cylinder unit (4, 5).

Abstract: A radial piston pump having a drive shaft with camlike protuberances. The pump has a plurality of pistons movable in the radial direction, and one plate is retained on the end of each piston to engage the drive shaft. One or more recesses are disposed in the plate facing the piston, the recesses are engaged by snap hooks on a plate retainer on the piston. In a first variant a blind bore with a circumferential groove recessed out of the middle of the plate facing the piston is engaged by a snap ring retained in a notch on the piston. In a second variant a blind bore is recessed out of the plate facing the piston, and two parallel bores extend transversely to the blind bore, the center lines being tangent to the blind bore, and the bores receive two pins, which engage a notch on the piston.

Abstract: A radial piston pump used for producing high fuel pressure in fuel systems of internal combustion engines, in particular in a common rail injection system includes a housing with at least one cylinder and a drive shaft is supported in the housing and having at least one cam section. A stroke ring is disposed encompassing the cam section a piston contained in each cylinder is supported against the stroke ring. A possibility for adjusting the delivery quantity of the radial piston pump is achieved in that an adjusting ring is disposed between the cam section and the stroke ring and the internal opening of this adjusting ring is eccentric in relation to the outer contour and can be rotated around the central axis of the internal opening into a desired angular position in relation to the cam section.

Abstract: A radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines, which includes a common rail injection system. The system includes a drive shaft that is supported in a pump housing and is embodied eccentrically for driving a number of pistons that are disposed radially in respective cylinder chambers into a reciprocating motion in the radial direction in the cylinder chambers upon rotation of the drive shaft. For each piston, a metallic housing part which constitutes the respective cylinder chamber is provided with a fuel intake opening and a fuel outlet opening which are controlled by intake and outlet valves. In order to uncouple the high-pressure sealing points from one another and to respectively define them in a statically exact fashion, the pump is embodied so that the housing part rests with a flat contact surface against a flat contact surface of the metallic housing base body.

Abstract: The invention concerns a technically optimized radial piston engine comprising a cam ring and a cylinder block arranged so as to rotate about an axis of rotation relative to the cam ring and having a plurality of cylinders oriented in the radial direction of the cylinder block. A piston capable of being radially displaced is located in each cylinder, resting on the cam ring via a roller. Said roller is mounted on the piston so as to rotate about an axis parallel to that of the cylinder block and rests axially, relative to its axis of rotation in the cylinder, against roller guides arranged on its surfaces. Said radial piston engine is characterized in that the roller guides are integrally mobile with the roller associated with them, in the piston stroke direction, and thereby driven by the roller both when the piston performs a loaded stroke and an idle stroke, without any contact occurring between the roller guides and the cam ring.

Abstract: The invention relates to a radial-piston hydraulic motor (10), having at least one cylinder groups (1) placed in a stationary position, which. cylinder groups contain piston mechanisms moving radially back and forth. A cam ring (12) is connected with a box frame (11) and the box frame with a distributor valve (13), which controls the pressurized fluid flow at the correct time into the cylinder spaces of the pistons that are at the power stage. The sense of rotation of the motor can be reversed by reversing the direction of flow of the fluid through the distributor valve (13). The fluid is passed to the distributor valve (13) through the sets of ducts in the shaft (14) which is placed in a stationary position together with the cylinder frame(s) (15) of at least one cylinder groups (1). The distributor (13) has a duct (31) which communicates with the power pressure and which is opened on the side face (13a) of the distributor (13).

Abstract: The invention relates to a hydraulic unit for a hydraulic control and/or regulating device, in particular for anti-blocking and/or anti-slipping brake systems, comprising control and regulating electronics arranged in a control housing as well as a valve block connected to said control housing, whereby at least one driving means is provided for at least one pressure-generating element. A cavity associated with the pressure-generating element receives leakage fluid from the pressure-generating element and a discharge channel that is connected to the cavity is provided in the valve block. According to the present invention, a means is associated with the discharge channel, and said means prevents fluid from entering into the discharge channel.

Abstract: A hydraulic aggregate has at least one displacing machine having a driving mechanism, a driving/driven shaft, and a compensating coupling connecting the driving/driven shaft with the driving mechanism, and at least one machine unit connected with the driving/driven shaft of the displacement machine through a component, the compensating coupling between the driving mechanism and the driving/driven shaft of the displacement machine compensating a radial and an axial offset between the displacing machine and the machine unit.

Abstract: The radial piston pump possesses a pump housing in which a plurality of cylinder bores are provided having pump pistons placed therein which can be driven by a cam. Further, an arrangement is provided in each pump piston (3) wherein the inlet or the outlet, or both the inlet as well as the outlet of the fluid in each cylinder bore, is controlled.

Abstract: An axial piston fluid pumping apparatus is disclosed in which wobble pistons are rigidly connected to arms of a nutating plate that is rotatably mounted on a bearing which is mounted on a drive shaft. The axis of the bearing is at an acute angle to the axis of the shaft. The wobble pistons move within cylinders whose bores are disposed about the axis of the shaft. In one embodiment, the pistons are supported by leaf springs and radially resilient connecting rods and the crankcase is enclosed.

Abstract: The invention relates to a vehicle hydraulic brake system with electrohydraulic brake boosting by a piston pump. In order to reduce pressure pulsations on an intake side of the multi-piston pump, the brake system embodies a multi-piston pump, for example, as a six-piston pump with stepped pistons that are driven with an alternating phase shift of 30° and 90° in relation to one another. The phase shift of the drive of the stepped pistons is selected so that the intake volume flows have a uniform phase shift, by which the total intake volume flow of the multi-piston pump has a reduced amplitude of the pressure pulsation, which reduces the repercussions on a master cylinder.

Abstract: The invention relates to a radial piston pump for high-pressure fuel supply in fuel injection systems of internal combustion engines, in particular in a common rail injection system. The piston pump has a drive shaft which is eccentrically supported in a pump housing and on which a ring is slidingly supported. The ring cooperates with a plurality of pistons, disposed radially relative to the drive shaft in a respective cylinder chamber. The pistons are movable radially back and forth in the respective cylinder chamber by rotation of the drive shaft. To increase the efficiency of the engine, the cylinder chambers are filled with less fuel when demand drops. In this so-called partial element filling, in which a plate is retained in contact with a polygonal ring, increased wear and damage are prevented. The wear is brought about by a guide device which prevents rotation of the ring about its own axis.

Abstract: A radial piston machine, e.g., a radial piston pump, in which an eccentric, rotatable on a stationary axle, drives multiple radially arranged pistons via an external sliding ring. Since a pump of this type operates with intake regulation, the delivery chambers are only partially filled above a middle speed range. Therefore, pressure surges, which cause noises, arise upon the impact of the piston on the oil volumes to be pushed out. These pressure surges may be reduced if a flexible circlip is positioned between the external sliding ring and the eccentric. Such a circlip allows the piston to deflect slightly together with the external sliding ring at the beginning of the pressure stroke, so that pressure peaks are suppressed and the noises are reduced. The flexibility of the circlip is increased using openings, which are positioned along the central axis, i.e., in the plane of the piston axle.

Abstract: The pump has a body in which at least one cylinder for a piston is fixed by a head having a surface facing a corresponding surface of the body. The head has an intake conduit having an inlet at the surface of the head, and the body has a feed conduit having an outlet located at the surface of the body and at the inlet. Between the surfaces, a first seal is placed about the cylinder, and a second seal about the inlet. The seals are separate and made of elastomeric material. One of the seals is housed inside a circular depression in the seat of the cylinder, so as to engage the lateral surface of the cylinder.

Abstract: A fuel injection pump is provided which stops fuel discharge when a movable member for pressurizing the fuel is lifted beyond top dead center, thereby leaving a cam ring. The pump prevents the movable member from colliding with the cam ring and damaging the members of the pump. The movable member has a plunger. An outer diameter d of one portion of the plunger has a diameter smaller than an inner diameter D2 of an inner fitting surface of a cylinder in which the plunger is positioned. An outer diameter D1 of a different portion of the plunger is somewhat larger than the inner diameter D2 of the inner fitting surface of the cylinder. When a drive shaft overruns, the speed of an orbital movement of the cam. ring and a speed of reciprocating movements of the movable member increases. This causes an inertial force of the movable member in the lifting direction thereof to exceed an urging force of a spring. As such, the plunger is sometimes lifted beyond a top dead center.

Abstract: The radial piston pump has a number of cylinder bores in a pump housing to accommodate pistons which slide into them; the cylinder bores are plugged by pressed-in stoppers (3) in which pressure channels are incorporated, all stoppers being sealed by a flat spring (6) which serves as return valve. To enlarge the outflow cross section through the pressure channels, each stopper 3 has at least one side discharge channel (8, 9).

Abstract: A radial piston pump has a support ring disposed on an eccentric longitudinal section of a pump shaft for rotation relative to the pump shaft. The support ring has at least three mutually offset flat support faces uniformly distributed about the circumference and adapted to contact piston shoes connected with pistons that extend radially from the pump shaft. The piston shoes engage from behind with radial flanges support rails disposed on the support ring. Spring-supported pressure rings prevent the piston shoes from rotating relative to the support ring. The pistons extend through guide bushing with an outside diameter that is greater than the diameter of the radial flanges and also greater than the outside diameter of the pressure rings.

Abstract: The invention relates to a radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines, particularly in a common rail injection system. The pump includes a drive shaft that is supported in a pump housing and is embodied eccentrically or has a number of cam-like projections in the circumference direction. A number of pistons that are disposed radially with regard to the drive shaft are each disposed in a respective cylinder chamber and are set into a reciprocating motion in the radial direction in the cylinder chamber upon rotation of the drive shaft. Each respective cylinder chamber is sealed on the radial outside in relation to the drive shaft by a valve plate that has an intake side check valve and a high-pressure side check valve.

Abstract: A radial piston pump for supplying high fuel pressure in fuel injection systems of internal combustion engines that include a common rail. Pistons, which are disposed in a respective cylinder chamber, each of the pistons have a plate connected to one end. A center of each of the plates is embodied so that the stresses that occur in this location during operation are reduced. Reducing the stresses in each plate center advantageously extends the service life of each of the plates. A perfect function of the plate is thus assured, even at peak pressures of up to 2000 bar.

Abstract: The pumping plungers are actuated radially outwardly and withdraw inwardly by an eccentric rotated by the pump drive shaft and associated captured sliding shoes. Because the shoes are forced to follow the eccentric over the full 360° of rotation, the shoes themselves can play an integral role for implementing the function of an inlet check valve which controls flow through a charging passage in each plunger in a radial outward direction, to a respective plunger pumping chamber. Relatively low pressure fuel in the pump cavity surrounding the drive member, is drawn through openings in the radially inner end of the plunger, through an inlet passageway in the plunger, and into the pumping chamber.

Abstract: The invention relates to a radial piston pump for high-pressure fuel delivery in fuel injection systems of internal combustion engines, particularly in a common rail injection system, with a drive shaft (4) that is supported in a pump housing (2) and is embodied eccentrically or has a number of cam-like projections in the circumference direction, and preferably with a number of pistons (12) that are disposed radially with regard to the drive shaft (4), each in a respective cylinder chamber (18, 74), and can be set into a reciprocating motion in the radial direction in the cylinder chamber (18, 74) upon rotation of the drive shaft (4), wherein each respective cylinder chamber (18, 74) is sealed on the radial outside in relation to the drive shaft (4) by a valve plate (24, 72) that has an intake side check valve (26, 60) and a high-pressure side check valve (28); in order to increase the efficiency of the pump, the invention proposes that the intake side check valve (26, 60) has a tappet (30, 66) that passes th

Abstract: The invention is based on a radial piston pump (1) with a pump body (2), in which pump body (2) are placed pistons (4), and cylinders (5) arrayed radial to a cam (14) and the pistons (4) upon an inward thrust suck in fluid by means of suction side intakes (17) and upon an outward thrust, the pistons (4) impel fluid through pressure openings (7) in the outer end walls (6) of the cylinder (5) into a plenum (10). It is proposed, that in the base of the cylinders (4) respectively a connection boring (32) is made to the cam (14), which connection boring (32) is controlled by a relief valve (18). Upon the exceeding of its opening pressure the relief valve (18) opens and pressure peaks in the cylinder (5) can be diminished by means of said connection boring. At the same time, a pressure buffer between the base of the piston (4) and the bearing shell (16) is formed.

Abstract: A radial-piston pump has at least one delivery unit with a delivery element. A pump casing is provided which has a first accommodation space for a medium to be delivered and a second accommodation space for a lubricant, the pump casing further has an eccentric side and a casing side. A separating device separates the first accommodation space and the second accommodation space from one another. The separating device has a first sealing element disposed fluid-tightly on the casing side of the pump casing and a second sealing element disposed on the eccentric side and connected fluid-tightly with the first sealing element. A shaft bearing configuration is disposed in the pump casing and supports an input shaft having an end portion. An eccentric element is disposed on the end portion of the input shaft. The second sealing element is disposed so as to be capable of sliding in a circumferential direction of the eccentric element.

Abstract: The invention is based on a radial piston pump (1) with a pump body (2), in which pump body (2) are placed pistons (4), and cylinders (5) arrayed radial to a cam (14) and the pistons (4) upon an inward thrust suck in fluid by means of suction side intakes (17) and upon an outward thrust, the pistons (4) impel fluid through pressure openings (7) in the outer end walls (6) of the cylinder (5) into a plenum (10) whereby the check valves (22) are formed from an annular coil spring valve (9) which cover the pressure ports (7) and the thereto connected stress relieving corrugations (8), and upon the exceeding of a specified threshold transport pressure, the respective pressure opening (7) opens to the plenum (10). The proposal is made, that a stress relieving zone (27) of a piston-cylinder unit (4, 5) be connected to the pressure zone (5, 7, 26) of a neighboring piston-cylinder unit (4, 5).

Abstract: In a radial piston pump (2), which has pump elements (10) arranged radial in the pump housing (7) and which in turn have an inlet valve (11) and an outlet valve (12) activated by the medium, the valves (11, 12) are disposed at the outer side of the pump elements (10) whereby the inlet valves (11) are arranged coaxial relative to the pump piston (13). All inlet valves (11) are connected to a joint intake channel (20) that leads around the outside of the pump housing (7).

Abstract: A multi-chamber positive displacement pump comprises a unitary housing in which is formed a plurality of cylinders. A pumping plunger is slidably mounted in each cylinder to define a pumping chamber. Means are provided for reciprocating the pumping plungers in order cyclically to vary the volume of the pumping chambers to effect delivery of a pumped fluid from the pumping chambers. A delivery passage is connected to each of the pumping chambers to receive pumped fluid therefrom, the delivery passage comprising at least one gallery formed in the unitary housing and open to an end face of the housing and passageways which extend through the unitary housing from the galleries to the pumping chambers. The galleries are closed by an end plate which is secured to the unitary housing. Feed passages and working fluid passages may likewise be defined by combination of galleries in the end face and passageways in the unitary housing.

Abstract: The compressor contains at least one piston (5) guided in a dry-running manner which, together with a cylinder insert (33), bounds a ring gap which is open over the common longitudinal section in each case and permits a leakage flow of the compressed medium. The piston (5) is coupled via a piston rod (42) to a support part (38) which is displaceably guided in the direction of its longitudinal axis (6) and is connected to a drive device. The piston rod (42) cooperates with the piston (5) and the support part (38) via support surfaces (43) which are convex at the end faces and permit relative movements of the support part (38) with respect to the piston (5) which extend transversely to the longitudinal axis (6). Accordingly, a parallel guidance of the piston (5) in the cylinder insert (33) is achieved which is not influenced by oscillations of the driving parts.

Abstract: In order to prevent a damage on a component forming a pressure feed fuel passage and to reduce a fuel injection pump in size and weight, the pressure feed fuel passage having fuel discharge passage, fuel chamber and accommodation hole formed in respective cylinder heads is formed straightly in respective cylinder heads, and has communication port for communicating with fuel pressure chamber and fuel outlet which has an opening at an outer peripheral wall of the cylinder heads. Fuel pressurized in fuel pressure chamber at the cylinder head side is introduced into fuel chamber of cylinder head via fuel passage and fuel lines. Fuel pressurized in both fuel pressure chambers is merged at fuel chamber of cylinder head, and is supplied to a common-rail via fuel passage.

Abstract: Fluid displacement apparatus with a set of opposing pistons in traveling chambers and a set of opposing pistons in stationary bores; a second embodiment with all pistons in traveling chambers; a third embodiment with all pistons in stationary bores. In each embodiment the displacement of the pistons can be different and the displacement can be variable. The apparatus is connected to a fuel cell stack to supply compressed gaseous fluid from a portion of the chambers and receive exhaust from the fuel cell stack in other chambers to perform an expander function. The apparatus can also be connected to a fuel cell stack and a reformer to supply compressed gaseous fluid to both and to receive exhaust from both as an expander. The chambers are sized differently to provide a pressure ratio across the fuel cell stack.

Abstract: A piston pump for a slip-controlled hydraulic vehicle brake system. For the sake of economical production, the piston pump is embodied with a plastic bush and with a needle of a needle bearing as the piston, and that an inlet valve is accommodated in a valve seat part (96) that is inserted into the bush (16). The invention has an advantage that both the inlet valve and an outlet valve can be mounted coaxially on the bush, and that the bush, because of its elasticity since it is made of plastic, brings about a favorable closing performance of the two valves.

Abstract: In a fuel injection pump, a helical gear is attached to an end of a camshaft and rotatable with the camshaft. The camshaft is biased in one axial direction thereof by a driving force that the helical gear receives from an engine crankshaft. A disk is provided in a position of the camshaft extending forward from a cam to the direction in which the camshaft is biased. An axial movement of the disk is restricted via a washer by an end of a bearing cover. The disk is formed in the same axis to a portion of the camshaft that is held by a journal bearing. An outer diameter of the disk is larger than that of the cam. An area where the disk and the washer are in sliding contact with each other is relatively large and the sliding regions thereof are constant so that hammer noises are prevented and frictional wear thereof are limited.