Abstract: A first aspect of the invention includes a multi-stage gas compressor having a central cam with a plurality of pistons operably connected to and radially extending from the central cam. The cam follower assemblies each include a roller element connected to a roller bracket which rides within and along a guide channel defines by facing grooves formed in housing end plates.

Abstract: The invention relates to a pump, particularly a high-pressure fuel pump, having a drive shaft, which includes a section that is eccentric to the rotational axis thereof and on which a ring is rotatably supported. The pump has at least one pump piston, which is directly supported on the ring via the piston base thereof, or via a support element and is driven in a stroke movement upon the rotational movement of the drive shaft. The ring has an at least approximately planar contact surface in the region of the support of the piston base or of the support element, and the support surface of the piston base or of the support element on the ring is greater than the cross-sectional surface of the shaft of the pump piston. The extension of the support surface of the piston base or of the support element in the tangential direction to the rotational axis of the drive shaft is greater than the extension thereof in the direction of the rotational axis of the drive shaft.

Abstract: The invention relates to a guide ring for an axially reciprocating pump piston, or for a pump rod of a piston pump. The invention provides for the guide ring to be configured as a radial damping element for damping radial impacts of the pump piston or of the pump rod. The invention further relates to a piston pump having such a guide ring.

Abstract: A pumping machine, that can serve a system as the sole main pump for pressurizing a primary liquid flow, incorporates, in a single machine, a rotor-drum type AP (axial piston) pump and a PX (pressure exchanger) that recovers energy from a secondary liquid flow such as the brine discharge from an RO seawater desalination system, with benefits including fewer moving parts and small machine size along with lower capital and operating costs. A single rotor-drum containing the cylinders and pistons is located between two end blocks, one or both configured with manifold passageways, ports and sliding valves. A swash-plate at one end reciprocates the pistons axially when the rotor-drum is rotated.

Abstract: A radial piston pump for supplying fuel at high-pressure to an internal combustion engine has a compression chamber arranged in a displacement housing, a reciprocating piston arranged in a cylinder chamber, a suction valve connected to a fuel supply line and has a spring-loaded closure body, an intermediate piece, a threaded pin and a pressure valve which is connected to a fuel outlet line. The closing body of the suction valve is embodied as a valve end pad with the spring exerting a force on the front end thereof. The valve end pad has a closure collar and at least two channels that are distributed around the periphery and which adjoin the closure collar and a base plate. A stop plate comprising an additional base plate borders the closure collar of the valve end pad as an intermediate piece to which the threaded pin is connected.

Abstract: A radial piston pump has a pump housing containing pump elements and whose high-pressure conduits extending in the pump housing are embodied so as to significantly increase the permissible operating pressures.

Abstract: A piston pump for a hydraulic pressure generator in a vehicle brake system is described. The piston pump comprises a housing, in which a bore for receiving an eccentric shaft is formed. In the housing at least six cylinders for receiving one pump piston each are further provided. The cylinders are disposed in pairs in three or more mutually spaced-apart planes and open out in each case into the receiving bore for the eccentric shaft. According to a possible realization, in a two-circuit vehicle brake system at least three cylinders are associated with each brake circuit to increase the operating comfort. To reduce wear, each of the provided eccentrics interacts with only two pump pistons.

Abstract: In a hydraulic apparatus, a first rotating member and a second rotating member are provided so as to be relatively rotatable with a same central axis, a cam is provided on the first rotating member, pistons are arranged on the second rotating member so as to be opposed to the cam, the pistons are pressed against the cam to contact by compression coil springs, oil chambers of which volumes are expanded and contracted according to movements of the pistons are provided on the second rotating member, first and second fluid paths through which oil flows into and out from the oil chambers are provided, and a path switching device for switching an inflow direction and an outflow direction of the oil in the first and second fluid paths according to difference in pressure between the first and second fluid paths is provided.

Abstract: A multipiston pump including a plurality of piston pumps hydraulically combined into at least two pump units are coupled on the intake side, but supply two separate hydraulic circuits of a vehicle brake system with pressure fluid. To reduce brake pedal pulsation the piston pumps are driven in phase-offset fashion. An eccentric unit comprising two spaced-apart cams rotated counter to one another, with the individual piston pumps being located in a number of sectional planes through the pump housing corresponding to the number of cams and locate the connecting conduits for hydraulically coupling the pump units are located in a region of the pump housing defined by the sectional planes.

Abstract: A radial piston pump (1) for supplying fuel at high-pressure to an internal combustion engine has a displacement housing (3) equipped with a compression chamber (4), a reciprocating piston which is arranged in a cylinder chamber (5) of a cylinder (30), a suction valve (10) which is connected to a fuel supply line (8) and a pressure valve (12) which is connected to a fuel outlet line (14). The suction valve (10) and the pressure valve (12) have, respectively, a closing head (16, 16?), a valve seat (18, 18?), a cylinder section (20, 20?) and springs (22, 22?). The suction valve (10) and the pressure valve (12) are identical components and the pressure valve (12) is incorporated into the radial piston pump (1) in the direction of flow counter to the suction valve (10).

Abstract: A fluid pump has a cylinder supporting a plunger and a pump housing formed with dissimilar metals. A pressing mechanism presses the cylinder and the pump housing relative to each other so that a pressurizing chamber is sealed through a pressing surface between the pump housing and the cylinder. The number of seal points can be reduce, and a reduction in reliability can be eliminated while realizing a reduction in weight of the pump housing and a reduction in cost due to increase in cutting capability, by using a soft material such as an aluminum alloy for the pump housing.

Abstract: A pump is disclosed. The pump may have a housing, and a body disposed within the housing and at least partially defining a plurality of barrels. The pump may also have a plurality of plungers associated with the plurality of barrels, and a plunger engagement surface. The plunger engagement surface may have geometry configured to reciprocate the plurality of plungers within the plurality of barrels as the plurality of plungers rotate relative to the plunger engagement surface, and a plurality of undulations configured to reduce a flow pulsation of the pump.

Abstract: A compressor suitable for use in a portable oxygen concentrator. In one exemplary embodiment, the compressor includes a crankshaft rotatable about a central axis and a plurality of diaphragm assemblies spaced apart around the central axis generally within a plane. The diaphragm assemblies include diaphragms movably mounted to respective housings to at least partially define chambers. A plurality of rods extend between respective diaphragms and the crankshaft. The rods are coupled to the crankshaft such that the rods are offset axially from one another along the central axis and are coupled to the diaphragms for cyclically increasing and decreasing pressure within the chambers as the crankshaft rotates about the central axis.

Abstract: A hydraulic machine arrangement includes at least one hydraulic machine having a plurality of pistons reciprocating within corresponding cylinders. The pistons can be driven by a cam to operate the hydraulic machine as a pump, and they can drive the cam to operate the hydraulic machine as a motor. The hydraulic machine can be configured to selectively disengage a certain piston or pistons from the cam to operate at less than full displacement. Controlling the pressure in the cylinders corresponding to the disengaged pistons can be accomplished by a number of mechanisms, including selectively exhausting fluid from the cylinders, or using a jet pump to siphon off some of the fluid from a high pressure side of the hydraulic machine. Two of the hydraulic machines can be mounted together to help balance axial forces and eliminate the need for an expensive high capacity thrust bearing.

Abstract: The invention concerns a refrigerant compressor (1), in particular a semi-hermetic refrigerant compressor, with a compressor block (5) comprising several cylinders arranged in a star shape, a motor, whose rotor is unrotatably connected to a crankshaft (11) that comprises a crank pin (22) and is supported in a bearing (13) in the compressor block (5), and a piston in each cylinder, each piston being connected via a connecting rod (23) to the crank pin (22), the connecting rod (23) comprising a bearing pad (24) that rests on the crank pin (22), the bearing pads (24) of all connecting rods (23) being held on the crank pin (22) by means of a ring arrangement (25). It is endeavoured to keep the load on the crankshaft small. For this purpose, each connecting rod (23) has a power application point (49) at the crank pin (22), which is displaced in the direction of the bearing (13) in relation to the axial centre of the crank pin (22).

Abstract: The invention concerns a refrigerant compressor (1), particularly a semi-hermetic refrigerant compressor, with a housing (2), having in its bottom part (3) an oil sump (4), a compressor block (5) having at least one cylinder (6), in which a piston (7) is arranged, a crankshaft (11), which is supported in the compressor block (5) and in driving connection with the piston (7), and an oil pump arrangement (27), which is at least partly submerged in the oil sump. Also with varying speeds, good oil lubrication must be ensured. For this purpose, the crankshaft (11) has at its lower end a diameter extension (19), through which an oil channel (35) extends eccentrically to the crankshaft axis (36), said channel (35) connecting the oil pump arrangement (27) to a closed oil pressure chamber (21) between the crankshaft (11) and the compressor block (5), said chamber (21) being connected to the inside (37) of the housing (2) via a vent path (40, 41).

Abstract: The present invention is directed to a rotary engine power transmission system for use in vehicular as well as other applications. The power system includes a rotary engine or pump, which may be pneumatic or hydraulic in configuration. The power system includes components whose purpose is to convert rotational force into pneumatic or hydraulic pressure where that same fluid pressure can be reconverted back into rotational force. This conversion can be from a source to a driven component, or from the driven component back to the same source for use, for example, in vehicular applications for use. One purpose in a vehicular specific application is to convert rotational source energy into rotational power at the vehicles wheels, for acceleration, and to reverse this process to recapture deceleration losses.

Abstract: An ultrahigh pressure pump includes a frame; a crankshaft having a journal; and at least one telescoping pump subassembly having inner and outer ends. The outer end is carried by the frame pivot so as to allow pivotal swinging movement of the pump subassembly, and the inner end is attached to the journal. The piston rod can reciprocate relative to the inner bore substantially free from side loads. The pump subassembly includes: an outer member including a cylinder defining an inner bore; and a inner member having a piston rod and a outer sleeve. The piston rod is received in the inner bore and the cylinder is received in the outer sleeve. First and second restraining elements are disposed at spaced-apart positions along the axis of the pump subassembly and are configured to oppose misalignment forces between the piston rod and the cylinder.

Abstract: An ultrahigh pressure pump includes a frame including at least one radially-extending member having an outer frame pivot disposed at outer end thereof; a crank rotatably mounted in the frame and adapted to be driven by a power source and a crank pin offset from a rotational axis of the crank; and at least one radially-extending telescoping pump subassembly having inner and outer ends. The outer end of each pump subassembly is attached to the outer frame pivot for pivotal swinging movement thereabout, and the inner end is pivotally attached to the crank pin. The pump subassembly operates substantially free from side loads on the piston rod and has a long component life.

Abstract: The present disclosure is directed towards a hydraulic device. The hydraulic device may include a rotor, a plurality of piston members extending from the rotor, and a plurality of piston sleeves receiving the plurality of piston members. Each piston sleeve may have a piston receiving end and a piston sleeve axis. The hydraulic device may further include a plate component supporting the plurality of piston sleeves. The plate component may have a plate component axis. The hydraulic device may also include an alignment component having a plurality of arms spaced in a non-contact relationship with a piston receiving end of a respective piston sleeve when the plate component axis is parallel with the piston sleeve axis of the respective piston sleeve.

Abstract: A reciprocating drive apparatus has a driving device and a driven device, one of the devices comprising a reciprocating member mounted for movement along a longitudinal axis. At least one rotary member is coupled to one of the devices and a linear bearing assembly has a linear guide rail and a linear slide member with an end coupled to the other device. A connecting link has a first end pivotally connected to the rotary member and a second end pivotally linked to the slide member. Where the reciprocating member is the driven device, rotation of the rotary member will cause the reciprocating member to move back and forth along the longitudinal axis.

Abstract: A rotor is accommodated in a yoke housing. Six magnets are arranged at equal intervals in the circumferential direction on the inner circumferential surface of the yoke housing so as to face the rotor. The core is generally cylindrical and includes an annular portion at an anti-output side and a balance at an output side. The magnets have six poles so as to effectively narrow a basal path width of the core in which the line of magnetic force concentrates most and magnetic saturation is likely to occur most. This reduces the diameter of the core. Therefore, the motor is effectively miniaturized in the axial direction and in the radial direction without complicating the formation steps.

Abstract: A high-pressure radial piston pump for common rail injection systems has a pump housing (1), a drive shaft (2), at least one pump piston (3) which can move in a radial direction in relation to the drive shaft (2) and a high pressure accumulator (4) integrated into the high-pressure radial piston pump. The high pressure accumulator (4) is embodied in the form of a ring.

Abstract: The invention relates to a gasket (1), particularly for a fuel high-pressure pump, comprising a first cutout (2) for a cylinder head, a second cutout (3) for a high-pressure channel, and a third cutout (4) for an induction channel. A first (5) and second sealing bead (6) are respectively formed around the cutouts for the high-pressure channel as well as around the cutout for the induction channel. The gasket (1) comprises a wider third sealing bead (7) that is formed so that it encircles the other sealing beads.

Abstract: The invention relates to a mobile machine having a traction drive and working hydraulics. The drive unit has a radial piston pump which is driven by a drive set and supplies working hydraulics. The radial piston pump is arranged on the axis of the output drive shaft of the drive set, between the drive set and a gearbox which is connected thereto via the output drive shaft. The drive set, the radial piston pump and the gearbox in this case form a compact drive unit.

Abstract: A hydraulic mechanism including a cylinder block having radial pistons and mounted to rotate in a stationary casing, and a distribution cover that forms a portion of the casing that has feed and discharge ducts that extend between an outside face and inside of face of the cover. The internal distributor has distribution ducts that are selectively connected to the feed and discharge ducts that open out into a distribution face that is perpendicular to the axis of rotation and that is disposed against the communication face (10A) of the cylinder block so as to cause the distribution ducts to communicate with the cylinder ducts. In a zone defined radially outwards by end-wall portions of the cylinders, a transverse face of the cylinder block is provided with an axial setback in which at least a portion of the distributor is disposed.

Abstract: A roller vane pump for fluid includes a carrier which is rotatable in a housing about an axis of rotation, the carrier carrying a plurality of roller vanes which are each received in a respective slot which extends inwardly of a periphery of the carrier and permits the roller to move inwardly and outwardly in use, the housing surrounding the carrier, pumping chambers being formed between the rollers, the carrier and the housing, the rollers engaging with the housing and moving inwardly and outwardly of their respective slots as the carrier rotates, in response to the configuration of the housing so that the pumping chambers change in volume as the carrier rotates, to effect pumping of the fluid, from an inlet to an outlet of the pump, and wherein in each of the slots in which the rollers are received, there is provided a restrictor element which restricts movement of the roller inwardly of its respective slot.

Abstract: The mechanism such as a motor or a pump comprises a cam (10) and a cylinder block (12) which has a plurality of cylinders (14A, 14B, 14) connected to communication orifices (34A, 35A; 34B, 35B) disposed in a communication face (18). The mechanism further comprises a fluid distributor (20) having a distribution face (22) which is provided with distribution orifices (31A-31F, 32A-32F) suitable for being connected to the feed or to the discharge. The communication orifices and the distribution orifices communicate with one another as the cylinder block and the distributor rotate relative to each other. At least certain cylinders (14A, 14B) are connected to at least two communication orifices (34A, 35A; 34B; 35B) spaced apart angularly (?) so that they communicate simultaneously with respective distribution orifices connected to the feed or to the discharge.

Abstract: A pump housing supporting a driving shaft has a plurality of cylinder bores extending radially and arranged at substantially regular intervals around an outer periphery of the driving shaft. Each cylinder bore has a plunger fitted therein, which reciprocates in response to a rotation of the driving shaft. An inlet, an inlet valve, an outlet, and an outlet valve are provided for each plunger. Fluid flowing from an inlet port provided in the pump housing flows into each inlet, and moreover, fluid flowing from each outlet passes through an outlet passage and flows into an outlet port provided in the pump housing. The outlet passage has a plurality of communication holes corresponding to the outlet valves. Outlet ends of the communication holes converge on one spot in the pump housing.

Abstract: The apparatus of the present invention includes a hydrostatic retarder pump and motor. The apparatus includes a housing rotatably supporting a shaft. The shaft includes a first eccentric portion and a second eccentric portion. A plurality of pistons are disposed within the housing and are engageable with the first eccentric portion. A plurality of valves are also disposed within the housing and are engageable with the second eccentric portion. The plurality of valves are configured to selectively connect the plurality of pistons with a low pressure accumulator or a high pressure accumulator. The rotation of the shaft may be implemented to drive the plurality of pistons and thereby transfer hydraulic fluid from the low pressure accumulator to the high pressure accumulator such that resistance is applied to the shaft and vehicle output is retarded. Alternatively, hydraulic fluid from the high pressure accumulator may be implemented to drive the plurality of pistons and thereby power the vehicle.

Abstract: A hydraulic machine has a plurality of pistons reciprocating within corresponding cylinders. Embodiments may operate as a pump, a motor, or both. The hydraulic machine can be configured to selectively disengage certain pistons from the cam to operate at less than full displacement. This provides a discrete variable displacement machine. The hydraulic machine can also be configured to provide a type of continuously variable displacement by changing the high and low pressure port connections to the cylinders at different positions of the pistons' stroke—i.e., positions other than TDC and BDC. To inhibit hydraulic lock when continuously variable displacement is used, the closing and opening of the high and low pressure ports are allowed to overlap; however, a barrier is used to inhibit short circuiting the fluid between the ports. Individual cylinders can be provided with relief valves to further inhibit hydraulic lock.

Abstract: A reciprocating compressor includes: a low-pressure stage compression part for compressing low-pressure working gas supplied from a supply source; two high-pressure stage compression parts for compressing the working gas compressed by the low-pressure stage compression part at two stages; and a crank mechanism for driving the low-pressure stage compression part and the high-pressure stage compression parts. The two high-pressure stage compression parts each have a plunger and a cylinder and are arranged on both sides of the crank mechanism in such a way as to extend coaxially opposite to each other. The low-pressure stage compression part has a piston and a cylinder and is located in the middle of the two high-pressure stage compression parts. The crank mechanism, the low-pressure stage compression part, and the two high-pressure stage compression parts are substantially located in the same plane.

Abstract: A high pressure radial piston fuel pump is featured having an hydraulic head with two or three individual radial pumping pistons and associated pumping chambers, annularly spaced around a cavity in the head where a rotating eccentric drive member with associated actuation ring are situated. A rolling interaction is provided between the actuation ring and the inner ends of the pistons for intermittent actuation. Relative rotation is provided between the actuation ring and the drive member. Respective inlet and outlet valve trains are situated in the head. The head is attachable to a removable mounting plate, and the drive member is rigidly carried by a drive shaft that is supported by two bushings, one located in the mounting plate and the other in the hydraulic head.

Abstract: The invention relates to a radial piston pump having external loading. Said radial piston pump has an inner eccentric which is attached to a rotatable driveshaft, a cylinder block which has positionally fixed cylinder bores aligned radially with respect to the driveshaft, and displacement pistons which are mounted in a longitudinally movable manner in the cylinder bores, with the displacement pistons having a piston head with a short casing height, and being mounted with their piston base on the eccentric, in such a way that the piston head, during its longitudinal movement, pivots in a predetermined angle range &r about the longitudinal central axis of the associated cylinder bore.

Abstract: A tilting plate type compressor includes: cylinder bores; a crank chamber; a drive shaft rotatably supported by a bearing provided within a bearing cavity; a tilting plate provided within the crank chamber and capable of swingably rotating due to a rotation of the drive shaft; and pistons capable of reciprocating within the cylinder bores due to swingably rotating of the tilting plate; an extraction path communicating between the crank chamber and a suction chamber; and an intake path communicating between the crank chamber and a discharge chamber. The extraction path includes an intra-axis path provided within the drive shaft and opens into the bearing cavity. The intake path opens into the bearing cavity and communicates with the crank chamber via the bearing cavity. According to the compressor, it can be prevented much as possible that oil leaks from the crank chamber through the extraction path.

Abstract: A radial piston pump for supplying fuel at high-pressure to an internal combustion engine has a compression chamber arranged in a displacement housing, a reciprocating piston arranged in a cylinder chamber, a suction valve connected to a fuel supply line and has a spring-loaded closure body, an intermediate piece, a threaded pin and a pressure valve which is connected to a fuel outlet line. The closing body of the suction valve is embodied as a valve end pad with the spring exerting a force on the front end thereof. The valve end pad has a closure collar and at least two channels that are distributed around the periphery and which adjoin the closure collar and a base plate. A stop plate comprising an additional base plate borders the closure collar of the valve end pad as an intermediate piece to which the threaded pin is connected.

Abstract: The invention relates to a drive device for a piston pump of a braking system of a vehicle having at least one piston element displaced in the longitudinal direction in a housing between an upper dead centre and a lower dead centre by means of an eccentric device. The eccentric device comprises at least one cam-shaped eccentric element having a covering surface forming a control curve which is used to control the displacement of the piston element. A roller bearing device is arranged between the control curve of the eccentric element and the piston element, which has such an elasticity that the piston element can be controlled according the predefined contour of the control curve of the eccentric element.

Abstract: An hydraulic head features two, three, or four individual radial pumping pistons and associated pumping chambers, annularly spaced around a cavity in the head where an eccentric drive member with associated outer rolling actuation ring are situated. The piston shoe or foot smoothly enlarges from the piston stem, thereby avoiding the concentration of stress at the interface. Another improvement is in the capture of the piston foot through beveled holes at the ends of a C-band spring such that the bevel substantially conforms to the contour of the foot and thereby reduces stresses and wear. Yet another improvement is that the C-band spring is retained within a guide channel of the cavity wall thereby permitting apparent reciprocating displacement of the spring in parallel with the reciprocation of the pistons, while avoiding axial movement or tilting within the cavity.

Abstract: A fuel pump for use in an internal combustion engine, the fuel pump comprising a pumping plunger for pressurising fuel within a pump chamber during a plunger pumping stroke, a rider member co-operable with a drive, and an interface member, for example a foot of the plunger or an intermediate tappet, for imparting drive from the rider member to the pumping plunger to perform the plunger pumping stroke. The interface member comprises an arcuate contact surface co-operable with the rider member. The inventive concept also extends to a pumping plunger for pressurising fuel within a pump chamber of a fuel pump, the pumping plunger comprising a foot having an arcuate contact surface for engaging a rider member of a fuel pump in use.

Abstract: A high-pressure pump having a rotationally driven drive shaft and at least one pump element which has a pump piston driven at least indirectly in a reciprocating motion by the drive shaft which piston is guided in a cylinder bore and with its end remote from the drive shaft defines a pump work chamber. The pump piston is braced at least indirectly on the drive shaft. Extending through the pump piston is at least one line which discharges at the circumference of the pump piston in the cylinder bore spaced apart from the end of the pump piston that defines the pump work chamber and which leads toward the drive shaft to the region where the pump piston is braced.

Abstract: The fluid machine with radial cylinders comprises cylinders (9) fixed with respect to the body (20) wherein the cylinders are peripherally spaced in the rotation plane of a crank (2) rotating with a driving shaft (1) of the machine; elements (12) distributing the fluid; it comprises, moreover, a piston (4, 34) of each cylinder placed in contact with the surface of said crank by means of sliding means (3, 39) and arranged within a jacket (6) of the cylinder with contact of the side (23), or side surface, of the piston in a restricted guide and seal area (7); for the guide function an annular edge (22) is present projecting from the inner surface of the jacket; for the sealing function a sealing ring (25) is present close to the guide edge on the jacket and housed in an annular slot (24) associated with the guide edge; elements (5) are also present for maintaining the contact between the pistons and the crank

Abstract: In an eccentric radial piston pump, a rib 12 protruded in a radial direction is formed on an inner peripheral surface of an end portion on a discharge side of an eccentric cam ring 3 over a prescribed range. In an eccentric radial piston motor, a rib 12 protruded in a radial direction is formed on an inner peripheral surface of an end portion on a high pressure side of an eccentric cam ring 3 over a prescribed range. By the rib 12 formed in the radial direction, a rigidity of the eccentric cam ring 3 can be improved, and the eccentric cam ring can be prevented from being deformed by a thrust from the piston. Thus, the rigidity of the eccentric cam ring can be increased without increasing the thickness of the eccentric cam ring, and further the eccentric radial piston pump and the eccentric radial piston motor in which outside dimensions in the radial direction are reduced can be provided.

Abstract: An active valve system may be used to improve operation of the suction valve(s) of a positive displacement pump. As appropriate, the active valve system may apply a force to the suction valve directed to open and/or close the suction valve. By quickening the opening and/or closing of the suction valve, the pump may run at a higher speed and operate with less wear. Additionally, the active valve system may allow all suction valves of a pump to be held open for various purposes.

Abstract: Proposed is a radial piston pump with a pump body, in which pistons and cylinders are circumferentially arranged about a driven eccentric, which the pump possesses a faceted slip ring (9) assembly which has an inner diameter and a polygonal outer diameter, the polygon consists of straight, axial parallel surfaces (13), the number of which represents the number of pistons (2) contained in the radial piston pump.

Abstract: The invention relates to a hydrostatic transmission having two bent axis- or swashplate-type axial piston units which are operated alternately as a pump and as a motor, with the two axial piston units being adjustable together with a pivotable dual yoke or by means of a pivotable dual swashplate. In order to minimize the dead volumes of the two axial piston units, the rotational axes of the two axial piston power units are offset with respect to the pivot axis of the dual yoke or of the swashplate by a magnitude such that, at all pivot angles, the power unit pistons, at dead centre, are located in the direct vicinity of the bore end of the cylinder block.

Abstract: The present invention relates to a multi-piston pump comprising a housing, a first pump unit having a plurality of piston pumps for the pressure supply of a first pressure circuit, a second pump unit having a plurality of piston pumps for the pressure supply of a second pressure circuit, a drive and an eccentric unit having a first eccentric and a second eccentric, wherein the first and the second eccentrics drive the plurality of piston pumps, and wherein the first and second pump units comprise in each case at least one piston pump which can be driven by the first eccentric and one piston pump which can be driven by the second eccentric. In that in each case, one piston pump which is driven by the first eccentric is arranged parallel to a piston pump which is driven by the second eccentric.

Abstract: A pump aggregate A comprises a one-piece cast hollow body 1 including an exterior connection block 3 and an interior lateral wall 16 of a bearing shield. A pressure transmission path is formed by a channel K which is made by casting in the lateral wall 16 of the bearing shield and which extends from the connection block 3 into a pump element mounting surface 18, 18?, 18? of the lateral wall 16 of the bearing shield.

Abstract: A high volume high pressure common rail pump for a fuel system includes pairs of pump head assemblies in phase with each other but oriented in opposition to one another about a rotating cam shaft. Pump pistons in the pump head assemblies simultaneously undergo pumping strokes via a shared two lobe cam of the rotating cam shaft. The pump may include two pairs of pump head assemblies, and each head assembly may include two pump pistons. The cam shaft includes two cams sufficiently out of phase with one another that the cam shaft always has a positive torque even when the cam lobes are symmetrical. In addition, because the pumping is done simultaneously on opposite sides of the cam shaft, the forces on the cam shaft are balanced and its support bearings experience less wear and tear.

Abstract: A system and related methods for manned and/or unmanned marine transportation involving equipping a vessel capable with a linear pump for propelling the vessel through or substantially over a body of water.

Abstract: A displacer unit with a valve plate body is disclosed. The displacer unit having at least one displacer space which is arranged in a cylindrical drum rotating about an axis of rotation and which can be connected to an inlet connection and an outlet connection by means of a control surface. The control surface is formed on a valve plate body which is provided with a first control opening, which is connected to the inlet connection, and with a second control opening, which is connected to the outlet connection. The first control opening and the second control opening are spaced apart radially, where the displacer space can be connected to the first control opening by a first connecting passage and to the second control opening by a second connecting passage. The connecting passages are provided with a respective mechanical face seal for sealing relative to the control openings.