Abstract: A sintered cam ring is secured to the inner surface of a cylindrical body by means of a bolt. A fuel injection pump has a rotor which supports a roller rotating along the inner surface of the sintered cam ring and is driven by an engine. The sintered cam ring is provided in the outer surface thereof with a groove extending along the central axis thereof. A positioning member for fixing the position of the groove and that of a pin hole formed in the body for receiving a bolt is inserted such as to stretch between the groove and the pin hole. Further, a bolt is employed to secure and tighten the positioning member fitted in both the pin hole and the groove from the outside of the body.

Abstract: A reciprocating pump comprises a plurality of parallel connected cylinder plunger arrangements and is driven via a cam mechanism (10) by means of a rotary driving device. In order to insure a constant discharge, the cam mechanism (10) comprises in the case where three cylinder plunger arrangements are employed, three plate cams (14) fixed on a common shaft (13) so that they are spaced 120.degree. apart from each other, and the displacement curve (a1;a2;a3) of each plate cam is designed such that the sum of the displacement per unit angle of rotation in the accelerating section and the displacement per corresponding unit angle of rotation in the decelerating section is equal to the displacement per unit angle of rotation in the uniform velocity section.

Abstract: In a pivot bar portion of a piston shoe in a radial piston device wherein the pivot portion is pivotably borne in a bed in the piston which extends normal to the longitudinal axis of the piston, recesses are provided parallel to the pivot axis whereby bearing lands are formed between the recesses. The bearing lands are tracting fluid out of the recesses along themselves and the bearing bed face of the piston, when the shoes pivot in the piston. A perfectly operational forced lubrication between the pivot portion and the piston is thereby assured which results in a long life and very high bearing capacity between the piston and the piston shoe.

Abstract: The former art provides multi stroke hydrostatic motors, which perform at a single revolution of the rotor multiple inward and outward strokes of the pistons. A high torque was thereby obtained. The invention discovers, that the known multi stroke motors are still too heavy, obtain small overall efficiencies and their power per size and weight is limited because the known motors failed to provide means to carry the tangential loads by fluid pressure power. The invention increases the power and efficiency of multiple stroke motors by the provisions of control means to control the flow of fluid pressure into pockets open to the piston faces and cylinder walls, whereby the torque of the rotor is transferred from the pistons to the cylinder walls by pressure in fluid in the pockets. The invention also provides means to enlarge the stroke of the pistons in a given size and weight of the device.

Abstract: The invention relates to a liquid ring compressor in which only one central emptying opening is provided to the outside per compressor stage. It is ensured by means of appropriate connections of the chambers pertaining to each compressor stage that the entire auxiliary/operating liquid can flow out of the compressor through the central emptying opening (s) when the compressor is stopped.

Abstract: A variable displacement wobble plate type compressor with a variable angle non-rotary wobble plate, having a suction chamber for refrigerant before compression, a discharge chamber for refrigerant after compression, suction and discharge cylinder bores, pistons reciprocating in the cylinder bores, a crankcase receiving therein a drive and a wobble plate mechanism mounted about a drive shaft connectable to a rotary drive source, i.e.

Abstract: In a radial piston engine, in order to reduce the friction forces appearing at the pistons, a guide part is provided which engages a hollow piston through a guide section and which includes a bearing section at its outer end, by means of which the guide part is pivotably mounted in the cylinder cover.

Abstract: A swash plate type compressor is provided with a compressor shoe having a sliding contact surface for making sliding contact with a swash plate. The sliding contact surface is formed with a central hole. A crest portion is formed between the hole and the outer periphery of the shoe, and smooth surface portions connect the crest portion with the hole and the outer periphery, the crest portion being located substantially at or inwardly of a radially middle point of the sliding contact surface between the hole and the outer periphery.

Abstract: Variable stroke pump apparatus includes a photovoltaic array for providing electrical current to motors, one of which provides for the pumping action of a walking beam, one of which provides for movement of a control unit which varies the length of stroke of the pumping apparatus from a minimum of zero to a maximum, and one of which operates a counterweight for moving the counterweight in response to the pumping load. The apparatus includes mechanical elements which adjust the length of the stroke of the pumping arm, and a control system which controls the length of the pumping stroke in response to the output of the photovoltaic array.

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: An accurately controllable two-stage pump assembly comprising two plunger pumps connected in series. The suction port of the outlet pump A is connected to the discharge port of the inlet pump B, so that the discharge port of the outlet pump A and the suction port of the inlet pump B act as the discharge port and the suction port, respectively, of the whole pump assembly. While the inlet pump B is delivering fluid from the whole pump assembly, the outlet pump A completes the filling stroke of the whole pump assembly and fully increases the pressure inside the chamber of the outlet pump A. While the inlet pump B is filling, the outlet pump A is in the stage of displacement stroke and delivers fluid from the whole pump assembly. The plungers of the pumps are moved via cams by stepper motors which swing or rotate back and forth within a certain angular range.

Abstract: On piston shoes in radial piston pumps, motors and engines the radial load which is excerted by the pressure under the piston onto the piston shoe is to a high rate borne by hydrostatic bearings between the piston shoe and the inner guide face of the piston stroke actuator ring. At high revolutions per given time the centrifugal forces appearing from the masses of piston and shoe increase drastically which results therein, that the bearing capacity of the hydrostatic bearing fails to bear the increased load. The invention gives rules how additional hydrodynamic bearing portions can become provided on the outer portions of the piston shoes, whereby those portions will carry an additional load by hydrodynamic actions. Since the bearing capacity of such bearing portions increases with increase of the rotary speed of the device, the applicable range of revolutions per minute can be increased by the application of the invention.

Abstract: Stalling of liquid ring pumps during start-up is prevented, without the need for a separate liquid pump or other means for initiating or sustaining the flow of make-up pumping liquid into the pump, by providing a bypass conduit for initially conveying some pumping liquid from the relatively high liquid pressure side of the pump to the relatively low liquid pressure side of the pump. This helps the pump establish the internal liquid distribution needed to form a viable liquid ring and create the gas pressure differential necessary to initiate and sustain the inflow of make-up pumping liquid.

Abstract: A low volume submersible pump assembly has features to stabilize the operation. The pump assembly includes a centrifugal pump driven by a submerged electrical motor. The centrifugal pump has an impeller configuration that is designed for high specific head, but potentially unstable operation. At the design speed, the pump potentially could deliver an indeterminate flow rate for a given head. Also, at the design speed, the design flow rate will yield a design head that is very close to the maximum head at zero flow. The pump has the characteristic of requiring a significant increase in torque to produce higher flow rates. To stabilize the potentially unstable pump, a variable speed drive varies the speed of the motor to maintain constant torque. Maintaining a constant torque allows a considerable variance in head with only a small variance in flow rate resulting.

Abstract: The invention concerns a bilge pump control system. Sensing of water level in the bilge is accomplished by the conduction of current (on the order of one milliampere) between two stainless steel probes. The probes are mounted in a triangular package which is placed in the boat bilge. When immersed, a conduction path is provided between the probes. One edge of the package is aligned with the probes to enhance water run-off. An associated circuit is activated when the conduction path is present (when the probes are immersed) which operates the bilge pump in a time-hysteresis fashion.

Abstract: A variable displacement swash plate type compressor having a cylinder block in which a drive shaft is centrally and axially extended so as to mount thereon a swash plate assembly to drive pistons reciprocally arranged in a plurality of cylinder bores arranged circumferentially about the drive shaft. The swash plate assembly has a rotary swash plate and a non-rotary wobble plate in a crankcase formed in the cylinder block and a mechanism for changing the wobble angle of the swash plate and the wobble plate by turning them about an axis extending at a right angle to the rotating axis of the drive shaft and passing through points which come into registration with respective centers of connection of connecting rods of the pistons and the wobble plate when the pistons are at the top dead center of their strokes within the cylinder bores.

Abstract: A hydrokinetic amplifier 10 that combines a liquid and vapor to produce an amplified liquid output pressure is used for compressing or liquifying gas by admitting gas to be compressed into a region where the liquid and vapor are in contact and the vapor is accelerating the liquid. The admitted gas is allowed to merge with the liquid and vapor and become compressed or liquified within the pressurized liquid output. A mixture of liquid and compressed gas can be used directly for purposes such as cleaning, or the liquid and compressed or liquified gas phases can be separated in the output so that either one or both can be used.

Abstract: A device for elevating liquids in which liquid is raised in a pipe under the action of a pressure difference which is smaller than a pressure difference of a solid liquid column having a height equal to a height of elevation.

Abstract: A base component for a fluid transfer device such as a hydraulic hand pump, cylinder or valve and a method of making the base component for such a device. The base component includes first and second base members having internal passages in communication with one another which subject the members to internal fluid pressure, and an encapsulating housing attaching the members together. In one form, the housing is composed of a moldable plastic material and surrounds both base members which are composed of extruded aluminum. In another form, the housing is integrally formed with one of the base members of a moldable plastic material and surrounds the other base member which is composed of extruded aluminum. In both forms structural members such as yoke members, which pivotally mount the piston and handle assemblies of a hand pump, may integrally be formed with the plastic housing.

Abstract: The invention relates to a fluid engine constituted by cylinders divided into two groups, by a valve bank which comprises two enclosures connected selectively to a source of fluid and to a reservoir, and connecting each cylinder of a first group, with the said enclosures, successively, and by means for selecting the speed of the engine, which means comprise a movable member adapted to occupy two positions which, in a first position, creates a communication between the cylinder of the second group and the enclosures, successively, and in a second position, isolate said cylinders from one of the enclosures.Said engine comprises a shuttle valve which, when the movable member is in its second position, connects the cylinders of the second group to that of the two enclosures which contains the fluid under the lowest pressure.The invention finds an application in the production of a mechanically reliable reversible engine.