Abstract: An eccentric anti-friction drive for fluid power apparatus is disclosed wherein the eccentric element comprises a tubular cup or sleeve made by deep drawing a hardenable steel material. The eccentric element comprises two cylindrical peripheries disposed eccentrically with respect to one another. One of the cylindrical peripheries is fitted to the rotating member of a prime mover and the other cylindrical periphery comprises the inner or outer race of an anti-friction bearing of the anti-friction drive.

Abstract: A radial piston pump is described with dual pistons which are slidingly accommodated within a bushing coupled end to end to a valve body. Automatically controlled suction and discharge valves for a pressure chamber are arranged one behind the other in the longitudinal axis of the pump. The pistons are sealed by means of elastomeric seals compressed by an end of the valve body and bushing under pressure of a threaded sealing plug installed in the pump housing. The valves, valve body and bushing form a cartridge separately assembled and installed as a unit in the housing. The threaded sealing plug is formed with a damping chamber for damping of pressure pulsations.

Abstract: A radial plunger type pump includes a housing, an eccentric cam shaft rotatably supported by the housing, a pair of bearings for supporting the cam shaft in the housing, a radial plunger reciprocally disposed in a cylinder of the housing and reciprocating within the cylinder of the housing in accordance with the eccentric rotation of a cam portion of the eccentric cam shaft. The pump further includes a pair of counterweights disposed in spaces provided between the bearings and the cam portion of the eccentric cam shaft, the pair of counterweights including a counterweight portion for balancing the rotation of the eccentric cam shaft and washer portion for preventing the plunger from axial movement wherein the counterweight portion and and washer portion are integrally secured and wherein the counterweights are engaged with the eccentric cam shaft for preventing the relative rotation therewith.

Abstract: A hydrostatic machine comprises a shaft, a rotor arranged on a shaft for rotation and having radially extending opening, a plurality of pistons arranged in the radial openings and having ends extending outwardly beyond the openings, a displacement curve arranged so that the ends of the pistons slide on the curve, channels for communicating the openings with a pressure medium and including passages which open laterally at the rotor, and a device for compensating an axial thrust applied by a pressure medium to the rotor and including pressure medium-actuated additional pistons.

Abstract: A radial compressor for a vehicle air conditioning system includes a cylinder block having an array of radially arranged cylinders. Each cylinder defines a piston receiving bore that is closed by a discharge valve assembly. A piston assembly is received for reciprocation in each bore by a drive assembly that is operatively connected to the engine of the vehicle. The compressor also includes an annular discharge chamber defined between the periphery of the cylinder block and an outer cylindrical shell. Dams extend into the discharge chamber adjacent the side of the bores closest to a single discharge port; that is downstream of the bores. The dams act as baffles to reflect incident pressure waves to reduce gas pulsations, vibrations and noise.

Abstract: A radial refrigerant compressor assembly for use in automotive refrigerant systems and capable of being cycled between on and off conditions having a fluid passageway extending between the bottom portion of the discharge chamber which operates at discharge pressure and the suction chamber which operates at a reduced suction pressure. A valve is disposed within the fluid passageway and regulates the flow of lubricant between the discharge and suction chambers under the force of the pressure differential existing between these chambers just after the compressor is cycled on and just after the compressor is cycled off.

Abstract: A positive-displacement type pump system, such as a fixed-cylinder type radial piston pump system, includes a common pump housing formed with a plurality of cylinders, and a plurality of pistons slidably received in the respective cylinders and cooperating therewith to form a plurality of pump units. A first throttle valve is disposed in a first suction passage of a first group of the pump units for operating a first actuator, for adjusting the flow rate of a working fluid to be supplied to the these pump units. A second throttle valve is disposed in a second suction passage of a second group of the pump units for operating a second actuator, for adjusting the flow rate of the working fluid to be supplied to the pump units of the second group independently from those of the first group. The pump units of the first and second groups can thus be individually adjusted in terms of the respective delivery volumes.

Abstract: This invention relates to a radial piston pump in whose suction bore (22) a load regulator (24) is inserted. The pump is to be regulated so that a constant stream and, as required, a variable large regulating stream will be available. For this purpose, a spool valve (26) that can be activated electromagnetically is inserted in a bore (23) that intersects the suction bore (22) and that spool valve can establish a connection to a suction duct (28) that is connected to a cam chamber (14) to make the regulating stream available by means of a collar (33). From suction bore (22) there furthermore branches off a shutter bore (34) that is likewise connected to the cam chamber (14) via a ring groove (35) and additional bores (36) in the pump housing (3). Shutter bore (34) limits the constant stream. The regulating stream is supplied to a consumer with fluctuating power consumption, for example, a hydrofan, that is powered with an rpm proportional to the cooling water temperature.

Abstract: A high-pressure water pump of the reciprocating piston type has its metal ston reciprocatable in a cylinder bushing composed of PEEK base high-strength thermoplastic synthetic resin and constructed so as to define a cooling clearance between the piston and the cylinder designed to prevent the temperature of the bushing on continuous operation from rising above 100.degree. C. The piston shoe and the slide bearing for the eccentric shaft should also be a PEEK based resin which can have a filler of carbon fibers, PTFE, glass fibers and/or mineral.

Abstract: A reversible flow pump (12) comprising: a first port (16) and a second port (20); a rotor (60) comprising a plurality of pump elements (74-80) movable through a fill mode and a discharge mode, a pump chamber (140) associated with each pump element (74) which are respectively filled and discharged; a ported shaft (30) rotatable between a first position and a second position, for carrying fluid to and from the various pump chambers (140), such that when in the first position fluid received at the first port (16) is communicated to fill each pump chamber (140) during the fill mode, at least a portion of such fluid is discharged therefrom and communicated to the second port (20), and wherein in the second position fluid flow is reversed. A brake system incorporating the pump is also disclosed.

Abstract: The invention seeks to reduce structure-borne sound emissions of the reciprocating piston pump. The reciprocating pump is includes an outlet valve, which has a valve seat and a valve closing body that is received in a hollow space and is loaded by a closing spring. One outlet bore radially originates at the circumferential region of the valve seat and branches off from the hollow space. The opening of the outlet bore toward the hollow space extends at least approximately between the valve seat and the end toward the closing spring of the gap of least cross section, which is formed between the valve closing body and the inside circumference of the hollow space. As a result, a slowed opening motion of the valve closing element is attained, in which opening motion an opening gap opens up that has its largest flow cross section in the region of the outlet bore.

Abstract: The invention is directed to improving the performance of a reciprocating piston pump in terms of noise. The reciprocating piston pump has a drive shaft, which has a circular cylindrical swash member, which is set at an acute angle (.beta.) to the longitudinal axis (O) of a pump and has a circumferentially disposed roller bearing ring. A pump piston, with its end face embodied as part of a spherical surface, engages the circumferential face of the roller bearing ring of the swash member. The longitudinal axes (O, P) of the drive shaft and pump piston extend in the same plane and intersect at right angles. The longitudinal axis (O, T) of the drive shaft and swash member are also offset from one another. Because of this configuration, a pumping phase that is considerably longer than the intake phase during one pumping cycle is attained. Changes in pressure andd force therefore proceed more slowly in the lengthened pumping phase, which improves the noise performance of the reciprocating piston pump.

Abstract: The invention relates to a radial piston engine, particularly a radial piston motor comprising a cylinder block within which a plurality of pistons and rollers are reciprocally mounted for cooperation with a cam path provided by a cam disc. Detent means are used to releasably locate the cylinders and rollers in a position corresponding with the lower dead point position of the pistons.

Abstract: This invention relates to a hydraulic mechanism comprising a cam; a cylinder-block mounted to rotate with respect to the cam; a plurality of cylinders arranged in this cylinder-block; a plurality of pistons mounted to slide inside a cylinder; a plurality of rollers for abutment of the pistons on the cam, each roller being mounted on a piston, rotating by means of a bearing for rotation, being axially defined by two transverse faces, and being capable of penetrating, at least partially, inside the cylinder in which this piston slides, the end of the piston comprising two recesses corresponding at least to the intersection of the cylindrical surfaces of the roller and of the piston, being open in the upper part of the piston; and two wedging pieces which are each disposed in a recess between the roller and the cylinder, in order to ensure axial wedging of the roller parallel to its axis of rotation.

Abstract: A radial piston and cylinder compressed gas motor is disclosed which is particularly suited for use where economical power sources are required. The motor includes a cylinder block having a plurality of radially extending cylinders open at their outer ends to radially extending passages and having exhaust ports open when associated pistons are adjacent their bottom dead center positions. Such passages extend to a valve system provided on the crank of the motor which functions to supply compressed gas to selected cylinders while connecting other cylinders together so that gas is exhausted from cylinders containing extending pistons to open exhaust ports in other cylinders. This minimizes back pressure to resist motor operation. The crank is formed of two generally cylindrical members and can be produced without eccentric machining or grinding operations.

Abstract: The invention relates to a device for a hydraulic unit, in particular in anti-skid systems for vehicle brake systems, which has a radial piston pump. The eccentric driven by a drive shaft in the pump meets pump pistons also located in the pump, usually in the region of high stroke variation speed. An resultant mechanical and hydraulic vibration, which causes noise and annoying movement at the brake pedal, is counteracted according to the invention in that a resilient intermediate element is disposed between the pump pistons and the eccentric element, and the eccentric is driven via a torsionally elastic coupling.

Abstract: A fuel injection system having a novel electromagnetic-actuated fuel pump in which four pumping elements, equally-spaced around a camshaft are mounted such that a pair of opposed pumping elements alternate to deliver pressure to a high pressure common rail with a second pair of pumping elements. In one embodiment of the invention the pumping elements are mechanically actuated, in another they are electronically actuated. The high pressure common rail is adapted to reduce surges in the fuel pressure from the pump up to levels of 20,000 psi. The common rail has a relief valve for controlling the maximum pressure in the common rail chamber. The electromagnetic injection nozzle has a needle valve that is closed by pressure in a balancing chamber having a reduced pressure level less than that of the pressure required to open the valve.

Abstract: The compressor comprises at least one high-pressure cylinder and piston unit having a piston which is guided in a cylinder liner and which is coupled with a crankshaft by way of a connecting element guided in the cylinder casing along the longitudinal axis of the cylinder. The piston is coupled with the connecting element by way of a mounting permitting movements of the connecting element relatively to the piston transversely of the longitudinal axis. Guidance of the piston is achieved without affect from oscillations of the connecting. The piston cooperates with the liner to bound a lubricant-free annular gap open over the whole longitudinal portion common to the liner and the piston. A dry gap ring seal can therefore be provided between the piston and the liner and ensures that the compression chamber remains seal tight even at pressures of above 60 bar. Preferably, the piston and the cylinder liner are each made of wear-resistant metal or ceramic material.

Abstract: The reciprocating compressor is made with yoke units which connect opposite pairs of pistons while eliminating play between the yoke units and sliding block. Each yoke unit includes a pair of shoes which are removably secured to the pistons and which are adapted to guide the sliding block moved by a crankshaft. Each yoke unit also includes a clamp ring which surrounds the shoes and which biases the shoes towards the sliding block. The shoes are removably secured to the pistons to permit the yoke unit to be readily disassembled. Bow-shaped clamping members may also be employed within each yoke unit to further bias the clamp ring against the shoes.

Abstract: This invention relates to a mechanism employing fluid under pressure, comprising: a stator; a rotor; a device for assembling the rotor with respect to the stator, effecting relative rotational assembly of these two elements about a geometrical axis, and ensuring axial holding of said two elements in position, in the two opposite directions, parallel to said geometrical axis; a reaction cam fast with a first of said elements; cylinders made in the second element and disposed radially with respect to said geometrical axis; and pistons mounted in said cylinders and abutting on said cam. According to the invention, the assembly device is constituted by a single bearing which comprises: two rolling tracks made directly on an extension of the reaction cam itself, and on an extension of the element itself in which the cylinders are made, respectively; rolling members disposed between the tracks, capable of abutting on these two tracks so as to ensure axial holding of the rotor with respect to the stator.

Abstract: Rectangular pistons are driven in a circular orbit by two spaced eccentrics on a common crankshaft. The displacement chambers reciprocate with a lateral motion parallel with the crankshaft. The radial forces created by the fluid pressure in the displacement chambers are balanced by a connection to the crankshaft through rotatable and slidable antifriction bearings. During the reciprocating lateral motion of the chambers, port openings located in the outer ends of the chambers are connected alternately to matching intake and exhaust port openings in the adjacent surfaces of the casing to provide a reversible valveless control of the fluid to and from the chambers. The apparatus can be used either as a pump or motor without internal modifications. The pistons are secured together as one piece and follow identical orbital paths. Each pair of opposing displacement chambers are secured as one piece and radially connected to the crankshaft.

Abstract: A radial piston pump has a rotor provided within a cylinder chamber in such a manner that a center axis of the rotor is offset from a center axis of the cylinder chamber. The rotor has three working chambers a piston is slidably provided each of which. Each working chamber may connect with a suction groove or a discharge groove so that there exists a couple of situations, one of which is that two working chambers connect with the discharge chamber simultaneously and another one of which is that single working chamber connects with the discharge chamber. In order to make the forcing point at which total biassing force of the piston is focussed move gradually, the radial piston pump has a delay angle at a front side of the suction chamber. Namely a pressure within the working chamber is preliminary reduced before the working chamber connects to the suction groove so that the forcing point should shift gradually.

Abstract: A radial piston pump is provided with a plurality of valve/piston cartridges. Each cartridge includes the piston and at least one of the valves connecting the piston to the inlet and outlet passages of the pump. The bearings for the main rotor are pre-loaded using a threadedly adjustable end guill. Once adjusted, the end quill is held in location by a pin or the like. The rotor itself is provided with counterweights to balance the eccentric cam surface. These features allow construction of a pump housing which is substantially a single unit, rather than two pump halves. A significant reduction in the number of machined bores also is obtained.

Abstract: A positive displacement pump comprises a mass such as a liquid filled pressure chamber or an annular ring which is rotated at high speed about a first axis so that centrifugal force acting on the liquid or ring creates zones of differential pressure within the interior of the pressure chamber or along the wall of the ring. At least one pumping unit having a pressure-responsive member is oscillated or rotated between the zones of differential pressure while the center of gravity of the pressure chamber or ring is maintained at a fixed distance from the first axis. In the course of moving into one zone having one pressure, the pressure-responsive member of the pumping unit is effective to intake a fluid such as air into the pumping unit. Air is discharged from the pumping unit by the pressure-responsive member in the course of moving from such one zone into another zone having a different pressure.

Abstract: A plunger pump including a plurality of plunger chambers, each slidably accommodating a plunger associated with a rotatable cam shaft having an eccentric cam for pressurizing fluid within said plunger chamber, comprises an essentially cylindrical casing with the plunger chamber and a partition wall dividing an internal space defined within the casing into a low-pressure chamber communicaitng through a fluid passage formed in type plunger with the plunger chamber and a high-pressure for receiving the pressurized fluid from the plunger chamber. The casing and the partition wall are integrally formed. The casing has a circular opening through which the shaft is inserted into the low-pressure chamber and another circular opening which is sealingly closed by a lid having high-rigidity. The casing also has an inlet port through which fluid is introduced into the low-pressure chamber and an outlet port through which the pressurized fluid is discharged from the high-pressure chamber.

Abstract: A radial piston pump has diametrically opposed pistons coupled to each other by a coupling ring mounted in circumferential grooves located adjacent the facing ends of the piston. The coupling ring is formed with axially projecting bifurcated arms received in the piston grooves. The arms are of a reversely bent undulating shape which is compressed between opposed walls of the groove to firmly couple the ring to each piston. The ring is thus supported entirely by the pistons. A central opening through the ring is expanded in the direction normal to the piston axis to provide clearance for side to side motion of an eccentric which drives the pistons in reciprocation.

Abstract: A hydraulic radial piston pump having a plurality of pistons arranged radially around the rotary shaft for sequential reciprocating motion in which working oil is introduced from the inner oil chamber in the pump casing supporting the rotary shaft and pistons passed into the outer oil chambers provided behind the pistons and then, discharged from these outer oil chambers to delivery passages. A eccentric motion element, the outer periphery of which abuts on the head of each piston, is connected to the rotary shaft by connecting means so that the eccentric motion element can perform eccentric movements about the rotary shaft. The eccentric motion element is also prevented by rotation stopper means from rotating about the rotary shaft. The piston has a suction orifice provided in the head thereof which is yieldingly pressed against the outer periphery of the eccentric motion element by spring means.

Abstract: A pump with a body formed by two elements sealingly clamped together, between which is defined a central chamber in which a drive shaft carrying an eccentric is rotatably mounted. A plurality of cylinders which open into the central chamber are arranged radially around the shaft in one element of the body, and pistons which cooperate with the eccentric are slidably mounted therein. These cylinders are in communication with a supply chamber defined between the first and second elements. The supply chamber is annular in shape and is formed in a position radially outside the central chamber. At least one sealing member separates the supply chamber from the central chamber. At least one passage is formed in one of the elements to put the supply chamber into communication with the central chamber. An electrically-controlled device controls the flow of fluid through the passage in a predetermined manner.

Abstract: An hydraulic pump and motor assembly for a vehicle hydraulic system has a housing accommodating the pump and motor, the pump having one or more spring-loaded pistons working in complementary bores to pump hydaulic fluid from a reservoir port to a delivery port, and the pistons being operated from an eccentric on a rotary output shaft of the motor through a cam bearing assembly. The assembly includes a retaining device for the pistons to limit their radially inwards movement, when the motor output shaft is removed, to an amount which is insufficient to break the hydraulic circuit containing the pistons. This enables the motor to be removed, while ensuring that the pistons are retained in their bores so that the hydraulic circuit remains intact. The cam bearing assembly may be mounted on the shaft without being retained on it, with the engagement between the pistons and the cam bearing assembly arranged so that they are all retained in the housing on withdrawal of the output shaft.

Abstract: A pump assembly having a pair of parallel annular hollow manifolds forming a pump frame with a series of pump units carried by the manifolds radially arranged relative to a central drive shaft which extends axially of the centers of the ring-like manifolds. The drive shaft has an eccentric which cooperates with a bearing hub to impart orbital movement to the hub when the shaft rotates. Each pump unit has a cylinder and piston with a piston rod connected to the piston being coupled to the bearing hub to reciprocate the piston within the cylinder. A diaphragm carried by the cylinder is spaced from the piston to define a chamber between the diaphragm and piston containing a quantity of driving liquid with the opposite side of the diaphragm forming a wall portion of a cavity for the fluid to be pumped, this cavity having inlet and outlet valves housed in a tubular valve body connected to the manifolds.

Abstract: A air shroud for cylinder and cylinder head assemblies of air-cooled compressors and engines of the type having a cooling air fan for producing an axial flow of cooling air and an array of cylinder and cylinder head assemblies arranged in the path of the axial flow and extending radially relative to the axis of said flow. In particular, the shroud has a flow channel portion of a polygonal segment shape which wraps around the periphery of the array of cylinder and cylinder head assemblies and forms an air channel from the cooling air fan to the cylinder and cylinder head assemblies and which is fastened atop each of the cylinder and cylinder head assemblies.

Abstract: The Compressor comprises three stages of compression, having three cylinders, each of the latter having a piston reciprocable therein. Two of the pistons are in-line along a common axis, and the cylinders therefor are in confronting relationship. The third cylinder lies along an axis which traverses the two-piston axis. All three pistons are reciprocated by two connecting rods, in that the in-line pistons are joined by tie rods. Both connecting rods are coupled to the single crank of a crankshaft which is journalled in a crankcase, and all three cylinders are removably bolted to the crankcase.

Abstract: A piston compressor. First and second manifold plates are joined together with their inner surfaces in fluid-tight abutment. First and second cylinder housings are affixed to the outer surfaces of the first and second manifold plates, respectively, in fluid tight fashion and oriented at 90.degree. with respect to each other. Each cylinder housing contains first and second opposed, fixed piston rod/piston head assemblies, each extending axially from an end of its respective cylinder housing. Each cylinder housing contains an elongated sleeve having an axial bore at each end receiving one of the piston heads in sealing engagement and defining therewith a compression chamber. A crank comprising a crank element and oppositely directed crank pins having its crank element located in a central hole in the manifold plates and its crank pins each mounted in bearings in a central transverse hole in one of the sleeves.

Abstract: The pump comprises a plurality of cylinders (4) disposed radially in a star formation around a shaft (5) with an eccentric (6) in a body (2, 3) formed by first and second members (2, 3) joined together by bolts (13). Each cylinder (4) is clamped in position between the first and second elements (2, 3) of the body between a pair of the said bolts (13). The facing surfaces of each cylinder (4) and of at least one (3) of the members (2, 3) of the pump body are spaced in correspondence with the central portion of the cylinder (4) in which is formed the chamber (9) in which the associated piston (10) is movable, so that the contact between the cylinder (4) and the at least one member (3) of the body (2, 3) of the pump is limited to surfaces outside the central portion of the cylinder (4).

Abstract: A pure rotary positive displacement device includes a rotatably mounted circular cylindrical housing having an even number of equiangularly spaced, radial cylinders formed therein. A rotatably mounted piston carrier rotates in synchronization with the cylinder housing and supports at least one piston for movement within the cylinders. The central axis of the piston carrier is offset from the central axis of the cylinder housing, and each piston is spaced from the central axis of the piston carrier by the offset between the rotational axes of the piston carrier and the cylinder housing. The pistons and cylinders preferably have congruent conjugate surfaces to reduce leakage between the pistons and the cylinders, and the pistons are rotatably mounted to the piston carrier. The number of pistons is typically one-half the number of cylinders, and if multiple pistons are used, then they are spaced equiangularly about the piston carrier.

Abstract: A radial piston pump is provided with a plurality of valve/piston cartridges. Each cartridge includes the piston and at least one of the valves connecting the piston to the inlet and outlet passages of the pump. The bearings for the main rotor are pre-loaded using a threadedly adjustable end quill. Once adjusted, the end guill is held in location by a pin or the like. The rotor itself is provided with counterweights to balance the eccentric cam surface. These features allow construction of a pump housing which is substantially a single unit, rather than two pump halves. A significant reduction in the number of machined bores also is obtained.

Abstract: The radial piston pump for pumping water, especially pure water, comprises pump housing, a central drive mechanism and a surrounding pump mechanism which has a plurality of piston-and-cylinder units radially oriented and distributed about its circumference. Inlet and outlet valves for individual cylinder chambers are located in the vicinity of the piston-and-cylinder units. The drive mechanism is located in a housing chamber which has an oil sump. The housing chamber is surrounded by a cooling device comprising a plurality of gaps and ducts for conducting water to the inlet valves which are provided with a suction intake fitting for admitting water.

Abstract: A fluid pump has two pairs of rectangular oppositely-disposed pistons. The pistons of each pair travel simultaneously in opposite directions at the same speed and over the same distance. Valving is provided by a reciprocating port plate, in face-to-face relation to the piston, driven in a circular path from two spaced crankpins and which in turn drives the associated piston. The sliding movement of the port plate controls the alignment of inlet and exhaust ports in the piston and port plate. The excursion or "throw" of the pistons can be varied from zero to maximum. A crankpin throw-adjusting mechanism simultaneously adjusts the throw of each crankpin, some in one direction, some in the opposite, so that all chambers are automatically adjusted for varying, but always identical, displacements. Self-lubricated seals between the piston and chamber walls are spring loaded, by an elastomerically sealed structure having non-linear deflection-to-force characteristics.

Abstract: The presence of a lubricant in compressed gas from a reciprocating compressor including at least one cylinder 76 reciprocally receiving a piston 74 mounted on a rod 60 and connected to a rotary shaft 12 by a rotary to reciprocating motion converting mechanism 44 is avoided by placing a bellows 130 between the cylinder 76 and various components, including a piston rod guide 64, requiring lubrication.

Abstract: In a valveless pump, a pump body, having a central chamber, is provided with a radially disposed array of pistons movable toward and away from the axis of the pump body. Cylinder heads cooperate with the pistons in controlling fluid movement through the pump. A drive shaft extends axially into the pump chamber and includes a surrounding eccentric cam. A linkage assembly pivotally connects the inward end portions of the several pistons with a tether ring surrounding the drive shaft for maintaining the pistons in contact with the eccentric cam and reciprocating the pistons in sequence for moving fluid through conduits sequentially communicating with the several piston cylinders.

Abstract: The low-noise pump assembly (10) comprises a unitized assembly wherein a drive shaft (17) of the motor (16) is mated directly with an eccentric coupling (23). The eccentric coupling (23) has a through bore (21) which receives at one end the drive shaft (17) and at the other end a center post (30) of the pump housing. Disposed between the center post (30) and eccentric coupling (23) is a radially inner bearing mechanism (60), and disposed between the exterior of the eccentric coupling (23) and an opening (52) of a ring member (50) is a radially outer bearing mechanism (70). The ring member (50) engages at least one reciprocating piston assembly (45). Rotation of the drive shaft (17) causes rotation of the eccentric coupling (23) to effect reciprocating motion of the pump piston (48).

Abstract: A radial piston pump with at least one pair of pistons which alternately perform working strokes and are arranged in a stationary cylinder block with working chambers comprising inlet valves and outlet valves. An eccentric shaft controls the radial movement of the pistons and an annular device connects the radially outward end portions of the pistons. To avoid friction between eccentric and pistons, provisions are made that the eccentric shaft is supported outside of the cylinder block. The radially outward end portions of the pistons project radially outwardly from the cylinders and, by way of the annular device, take support on the eccentric of the eccendtric shaft. The eccentric is rotatably supported in the annular device.

Abstract: A gearbox for a rotary, mineral cutting head, comprises a casing housing speed reduction gearing and also a portion of a drive shaft supported by first and second, spaced-apart bearings, with at least one radially extending cylinder having a closed inner end and an open, outer end provided in said drive shaft and a reciprocable piston partially housed in said cylinder with a fluid seal between said piston and said cylinder; a variable volume, pressure-generating chamber defined between a radially inner end of said piston and a closed, inner end of its cylinder; a ring surrounding said drive shaft and having an inner profile and with a radially outer end of said piston in contact with said inner profile and with said piston.

Abstract: A system for removal of workpiece material with a high velocity jet of working fluid, comprising an ultra-high pressure pump including a plurality of low pressure fluid cylinders and a plurality of high pressure cylinders longitudinally aligned with and adjacent the outer end of each low pressure fluid cylinder and having a high pressure piston reciprocally mounted therein and interconnected to reciprocate with a low pressure piston in an adjacent low pressure cylinder. High pressure valves are provided for each high pressure cylinder including an inlet check valve and an outlet check valve for releasing said working fluid under high pressure. A high pressure manifold is interconnected to the outlet check valves and a conduit carries the high pressure working fluid to a high velocity jet forming nozzle.

Abstract: A radial plunger pump is provided which includes a motor housing having a motor mounted therein. A pump housing is further provided and has a pump portion defined therein. A shaft is mounted between the motor and the pump portion so that the pump portion operates when rotation of the motor is transmitted to the pump portion by rotation of the shaft. A constant pressure chamber is defined between a first seal member and a second seal member both of which are fixed to the pump housing. The leakage of oil from the pump housing toward the motor housing is prevented by the first and second seal members and the constant pressure chamber. Further, a plate is provided within the constant pressure chamber which rotates with the shaft and prevents the entry of foreign objects into the constant pressure chamber through a constant pressure port which communicates to the ambient atmosphere.

Abstract: A high pressure fluid handling pump of the type having a drive shaft for connection to a drive motor where the drive shaft extends longitudinally through a pulsation dampener affixed to the pump's housing. The pulsation dampener comprises a cup-shaped housing having a pump shaft receiving bore extending through an end wall thereof and which, when secured to the motor housing, defines a hollow chamber in fluid communication with the pump's outlet. Disposed within the hollow chamber of the pulsation dampener housing and concentric with the motor's shaft is a rigid baffle member. Surrounding that is a tubular diaphragm formed from an elastomeric material of a predetermined durometer hardness, the tubular diaphragm effectively dividing the hollow chamber into two compartments isolated from one another.

Abstract: A hydraulic arrangement has a housing which includes a first space of a definite first pressure and a second space with a lower second pressure. A primary pump supplies fluid under the first pressure into the first space to open the entrance ports into cylinders, which contain pistons therein, whereby the pistons are forced partially out of the cylinders and into the mentioned second space. In the second space the pistons are moved inwardly into the cylinders by an eccentric cam ring to supply a flow of fluid of a fourth pressure out of the outlet of the arrangement's housing. In modified embodiments the arrangement is a pressure transmission, which takes in a third pressure to drive a motor in the arrangement which in turn drives the shaft with the eccentric cam and the unit then exits the fourth pressure, which might be a very high pressure of up to more than ten thousand pounds per square inch.

Abstract: A two-wheeled vehicle such as a bicycle includes a variable displacement fluid pump such as a radial plunger pump provided at a crankshaft of pedals and a fixed displacement fluid motor such as a gear motor at a rear wheel or a front wheel. The fluid pump and motor are connected through hydraulic passages. Plungers of the radial plunger pump are driven by a cam assembly whose eccentricity is adjustable by means of an eccentricity control means dependent upon the load acting upon the vehicle in a stepless manner, so that the speed of the vehicle can be changed in a stepless manner. Moreover, the vehicle includes automatic speed change means which automatically change the eccentricity of the eccentric cam assembly according to hydraulic pressure of the variable displacement fluid pump, so that the speed of the vehicle can be automatically changed.

Abstract: A pump comprising a housing and two end covers receiving a drive shaft with an eccentric thereon and with a plurality of radial pistons displaceable in radial bores provided in the housing and biased by springs. An inlet passage and an outlet passage are provided in each bore receiving the radial piston. A sealing disc is inserted between the housing and one of the end covers. Sealed through openings for high pressure medium are provided in the sealing disc. The maximal feeding flow of the pressure medium is limited by throttled passages provided in the sealing disc. A pressure control valve is provided, which is connected to an inner chamber of the housing, accommodating the eccentric.

Abstract: In the periodic lubrication of a circulating link chain conducted around chain guide wheels, irrespective of the chain speed a predetermined constant quantity of lubricant is supplied to each lubrication point on the chain in a time which continually changes with the chain speed. The lubricant is supplied by a series of lubricating piston pumps which are operated successively during each lubrication period in synchronism with the speed of the chain. The working stroke of each pump is the same and is effected by the displacement of a member having an inclined surface arranged to be engaged by one or more rotating governing cams carried by a driving shaft which is coupled to a shaft driven by one of the chain wheels. The driving shaft is coupled and uncoupled at the beginning and end of each lubrication period by means which counts the lubrication points of the chain passing a sensor and is thus also dependent on chain speed.