Abstract: A rotary compressor in a cooling or a heat pump system which is provided with an oil injector and includes an oil separator on the high pressure side of the system. Oil is returned to the compressor for lubrication, cooling and sealing and is normally caused to circulate by means of the natural pressure differences in the cooling system. When the pressure level is too small to provide sufficient oil circulation, an oil pump is connected. By employing a pressure controlled regulating valve in the system, which serves both as a pressure regulating and a flow regulating valve, the oil pump may be caused to run idle when a sufficient pressure difference has been attained in the system.

Abstract: An electropneumatic converter is provided comprising a gear pump. The two othed wheels are driven by two electric motors rotating at high speed in opposite directions. The control circuits for each of the motors are independent and a single motor may drive the pump permanently.The converter is used, for example in an activator for a cardiac module or artificial heart.

Abstract: A hermetic refrigeration compressor has a cylinder block and a crankshaft rotatable about a vertical axis to reciprocate a piston in a cylinder on the cylinder block. A separate bearing housing is secured to the central portion of the cylinder block and extends vertically along the crankshaft, where it carries a pair of roller bearings to journal the crankshaft. The crankshaft has a radially extending flange which is journaled by a thrust-type roller bearing above the bearing housing to absorb the vertical forces on the crankshaft so that all three of the roller bearings are between the crankshaft and the bearing housing to maintain and control the close tolerances required by such bearings.

Abstract: The invention relates to a hydraulic motor, in which a rotating motion is generated by a combined effect of a cam ring (2) and roller means (5) connected to the pistons (5) of a cylinder group (3).The object is to provide a new dummy coupling solution for a motor of this kind. To the cylinder group (3), preferably between two cylinders (4), is fastened a generally T-shaped support (8, 9) and round each branch (9) of the T is mounted a spiral spring (11) influencing respective piston (5). One end (12) of each spring influences the piston (5) through a passage (17) formed in the cylinder wall and the other end (13) of the spring leans against the support (8).

Abstract: A scroll type compressor with a variable displacement mechanism is disclosed. The compressor includes a housing having fluid inlet and outlet ports. A fixed scroll is fixed within the housing and has a circular end plate from which a first spiral element extends. The end plate of fixed scroll partitions the inner chamber of housing into a front chamber, which includes a suction chamber connected to the fluid inlet port, and a rear chamber. The rear chamber is divided into a discharge chamber connected to the fluid outlet port and an intermediate pressure chamber. The end plate of the fixed scroll has at least two holes which connect the fluid pockets to the intermediate pressure chamber. A control device controls communication between the suction chamber and the intermediate pressure chamber and includes communicating mechanism.

Abstract: A variable capacity vane type compressor has an unloading mechanism operative to relieve a part of compressed fluid from a working chamber when in its compression stroke and an additional mechanism for controlling the suction of fluid into the compressor. The additional mechanism has a spool valve movable to a position to restrict the opening area of the compressor suction port. The spool valve is disposed in a passage communicated with the suction port and with a working chamber when in its compression stroke. The spool valve is formed therein with another passage which, when the spool valve is in the position to restrict the suction port, communicates the compression chamber with the suction port to relieve a part of the compressed fluid.

Abstract: A rotary fluid energy converter which is used either as a hydraulic pump or as a fluid motor has a housing, a torque ring, pistons, a cylinder barrel, and spaces. The ring is closely held against the inner surface of the housing via first static pressure bearing which are circumferentially spaced from one another. As the ring is rotated relative to the housing, the volumes of the spaces increase or decrease. Each of the first bearings has two pressure pockets axially adjacent each other. Fluid flows out of the spaces and is distributed to the corresponding pressure pockets via restrictors.

Abstract: Coaxial, two-cylindered air compressor, more specifically an air compressor capable of continuous air exhausting and air feeding, has a cylinder provided at either end of a main frame; to the underside of the main frame is extended a link so that serves to displace pistons in both cylinders, that by the provision of a crank pin both are fitted by articulation to the shaft side of a crank case, so as to facilitate engagement of the motor on top of the main frame with reduction gears on the upper side of the shaft lever by means of transmission gears on the shaft center, thereby setting the crank case to rotation, so that both of the cylinders may exhaust and suck air in a continuous manner, thereby reducing airfeeding, and airsucking time.

Abstract: A rotary vane pump has a pressure operated valve to bypass pump outlet flow to the inlet of the pump for flow regulation. A metering throttle bore, downstream of a choke bore, responsive to viscosity is a passage from the pump to a consumer such as a servosteering system. Responsiveness to viscosity is effected by providing an area in cross section for flow passage in the metering bore, which flow area is much smaller than the wetted surface area of the passage. A pressure agent at a cold temperature having greater viscosity than that at a higher temperature will effect flow regulation of the pump sooner than the high temperature pressure agent. Since for a cold pressure agent the viscosity is higher, the resistance to flow through the metering throttle bore is greater. As a result, the pump must work at a higher pressure which actuates the pressure operated valve to effect bypass flow.

Abstract: An arrangement for the volume-controlled feed of a medium, e.g. a liquid, in an outer flow system, comprising a movable pump piston (10) and a metering chamber (20) in connection, or connectable, to the flow system via a valve-controlled inlet (22) and outlet (23) for the intake and discharge respectively of the medium in time with the working cycles of the pump piston (10). To make possible the change between different desired feed volumes of the medium the arrangement has a wall element (15) delimiting the volume of the metering chamber (20) which is movable inside the metering chamber (20) for the adjustment of the desired metering chamber volume.

Abstract: A positive displacement pump for a vehicle power steering system comprising a rotor (42) rotatable in and cooperating with a stator (20) to define a pump cavity (52), (54), inlet and outlet ports (56), (58) and (34), (36) communicating with the pump cavity and a flow control valve (96) located in the flow delivery circuit wherein provision is made for opening the flow delivery circuit to a bypass circuit (72) upon an increase in the speed of the vehicle beyond a design point thereby reducing the pump back pressure and power usage which results in increased "road feel" at increased speeds while maintaining normal power assist during steering maneuvers at low speeds.

Abstract: A fuel injection pump which has a shutoff device for the fuel supply to the pump work chamber, comprising a magnetic valve, which controls an intake bore to the work chamber of the fuel injection pump. The fuel injection pump further has a relief conduit, which is connected by an annular slide on the pump piston with the suction chamber in order to terminate the effective supply stroke of the pump piston. In order to assure reliable shutoff of the fuel supply to the pump work chamber, a check valve is further disposed in the connection between the pump work chamber and the suction chamber, which check valve is closed, during the intake stroke of the pump piston, with the collaboration of the pressure drop from the suction chamber to the pump work chamber.

Abstract: A hydraulic pump jack is disclosed which utilizes a hydraulic cylinder to provide pumping force to an oil well sucker rod. The hydraulic pump jack may be directly mounted on an oil well casing either above or below ground. A tubular piston rod which may be connected to a sucker rod in telescoping relation for transmitting vertical force without side loading is also disclosed. Apparatus for mounting the piston rod within a cylindrical housing is described. The use of a counter weight system for balancing the pump load is also described.

Abstract: Sensor circuitry is disclosed for a transducer (32) having a sensor or delta coil (66) for generating a magnetic flux through a path of movement of a magnetically permeable piston member (48), such that movement of the member (48) changes the return coupled flux linkage, which flux change indicates movement of the member (48), and having a reference coil (84) spaced sufficiently from the path of movement of the member (48) such that movement of the latter has less affect on return coupled flux linkage of the reference coil (84) than the delta coil (66). The coils (66 and 84) are connected (204) in respective parallel voltage dividers, and a half-wave rectified AC signal (diode CR11) is applied thereto.

Abstract: A variable displacement wobble plate compressor with a guide unit for a wobble plate, having a cylindrical guide rod axially extending in the compressor in parallel with a compressor drive shaft, a slide slidably and rotatably fitted on the guide rod and provided with lateral pivots on laterally opposite sides thereof which extend in a direction at a right angle to the axis of the guide rod, and a pair of shoes pivotally engaged with the pivots of the slide and slidably received in a radial recess formed in a lowermost portion of the wobble plate. Each of the shoes has a semi-cylindrical outer face complementary with a semi-cylindrical concave wall of the radial recess of the wobble plate so as to permit a relative turning of the wobble plate to the shoes. The slide and shoes may have oil passageways and/or oil grooves.

Abstract: In a rotary compressor for compressing a refrigerant gas by a compressor element adapted to be rotated by an electric motor, the improvement comprises a cylindrical member provided inside or outside the closed container and communicated with the first intake passage and with the first discharge passage; a second intake passage communicated with the cylindrical member and with the compressor element; a second discharge passage communicated with the cylindrical member and within the closed container; a first communication passage for communicating the second intake passage with one end of the cylindrical member; a second communication passage for communicating the closed container with the other end of the cylindrical member; and a valve member provided in the cylindrical member; and a spring which urges the end of the valve near the first communication passage; the valve member being moved to a first position to communicate the first intake pasage with the second intake passage and also communicate the first d

Abstract: A fuel injection pump has a rotary and axially slidable distributor member housed in a sleeve in which is formed a series of outlet ports and a series of inlet ports the two series of parts being in axially spaced planes. The distributor member has an outlet groove for registration with the outlet ports in turn and an inlet groove for registration in turn with the inlet ports. The two grooves communicate with a pumping plunger bore so that as the distributor member rotates fuel will be supplied to the bore through an inlet port and the inlet groove and will flow from the bore through the outlet groove and an outlet port. Interconnected balancing grooves are provided on the distributor member for communication with the outlet ports and inlet ports respectively to ensure that following delivery of fuel through an outlet port, that port will be connected to an inlet port before the next delivery of fuel through the port takes place.

Abstract: An isolation valve is provided for use in a pneumatic system having an air compressor operable in normal and unloading modes, an air dryer, a reservoir of charged air, and a governor. The isolation valve includes a housing provided with an internal cavity and having a first port to the cavity communicating with a first port of the compressor, a second port to the cavity communicating with an inlet port of the dryer, and a third port to the cavity communicating with a port of the governor. A pneumatically responsive primary valve member is mounted within the cavity for movement between open and closed positions with respect to the housing second port. The primary valve member is provided with an internal passage having one end in communication with the housing third port and a second end in communication with the housing cavity. A pneumatically responsive secondary valve member is mounted within the passage for movement between blocking and unblocking positions.

Abstract: The device of this invention has a variable capacity pump, a channel through which the discharged fluid from the pump passes toward an actuator, a variable choke located in the channel and pressure detecting means which detects the pressure difference on opposite sides of the variable choke. The pump varies its volume in relation with the pressure difference detected by the pressure detecting means. The opening area of the channel is varied by the variable choke in relation with the pressure of the fluid being supplied to the actuator, namely the pressure of the fluid flowing downstream of the variable choke. The device of this invention may also have an auxiliary variable choke located in the channel. The auxiliary variable choke can control the amount of fluid being supplied to the actuator in response to the operating condition of the actuator.

Abstract: A pressure and delivery regulating device for an adjustable pump includes a directional control valve connected in a discharge conduit and to a control conduit branching from the discharge conduit between the pump and the directional control valve. The control conduit leads to a setting piston for the adjustment of the pump. The directional control valve is controlled by a solenoid which in turn is controlled by a control system consisting of a regulating circuit, a delivery limiting circuit and a control circuit for the solenoid. The output signal from the regulating circuit controls a desired delivery value signal supplied to the delivery limiting circuit. A follow-up circuit connected between the regulating circuit and the delivery limiting circuit corrects the regulating signal and a circuit for producing a direction dependent signal from the actual pressure provides a damping of the regulating circuit.