Abstract: A variable capacity pump includes a control ring moveable within a pump chamber to alter the volumetric capacity of the pump. First and second control chambers individually receive pressurized fluid to create forces to bias the control ring in a predetermined direction. A return spring urges the control ring toward a maximum volumetric capacity pump position. The control ring connects and disconnects the second control chamber from a source of pressurized fluid based on a position of the control ring. Forces from the control chambers and the spring act in combination with one another or against one another and against the spring force to establish first and second equilibrium pressures based on a pressurized or vented condition of the second control chamber.

Abstract: A variable capacity pump includes a control ring moveable within a pump chamber to alter the volumetric capacity of the pump. First and second control chambers individually receive pressurized fluid to create forces to bias the control ring in a predetermined direction. A return spring urges the control ring toward a maximum volumetric capacity pump position. The control ring connects and disconnects the second control chamber from a source of pressurized fluid based on a position of the control ring. Forces from the control chambers and the spring act in combination with one another or against one another and against the spring force to establish first and second equilibrium pressures based on a pressurized or vented condition of the second control chamber.

Abstract: A process for the production of wear-resistant, coated surfaces includes the use of at least two electrodes connected to a voltages source which are mounted in, or border, a reaction space through which an electrolyte flows in which the surface to be coated is located. The process is distinguished by the fact that the direction of the flow of the electrolyte is selectively reversed at least once during the coating process to enable better control of the formation of the oxide layer.

Abstract: A pump is proposed, in particular a vane pump, for a liquid or gaseous medium, which can be driven with the help of a motor, in particular an electric motor, and which comprises a rotor (15) that can be coupled to a drive shaft (29) of the motor and is arranged in an operating chamber and at least one pressure plate (25) that closes the operating chamber (11) in the axial direction and on its lateral face (27) facing away from the rotor (15) is connected to a pressure chamber (23), and also a coupling element (47; 47′) which surrounds part of the drive shaft (29), cooperates with at least one seal and contributes to sealing off the pressure chamber (23) with respect to the motor, the drive shaft (29) extending through a through opening (35) in the pressure plate (25). The pump (1) is characterized in that the coupling element (47; 47′) has a sleeve-like section (49) which engages in the through opening (35) in the pressure plate (25).

Abstract: A compressor, in particular for a vehicle air conditioning system, with a housing, which contains a device for conveying a compressed medium driven by a drive shaft, designed as an axial piston machine and having at least one piston reciprocating in a cylinder block and a take-up plate connected to the piston working in combination with a swash plate rotating around a rotational axis, whereby the swash plate is connected to the drive shaft by a carrier and whereby the take-up plate encompasses a support device working in combination with a non-rotating thrust bearing.

Abstract: The invention relates to a hydraulic delivery device with a displacement unit which delivers a medium from a suction connection under output pressure to a pressure connection, connectable with a consumer, and under consumer pressure, and a regulating device for setting and/or limiting a volume flow delivered by the delivery device.

Abstract: The invention relates to a hydraulic delivery device with a displacement unit which delivers a medium from a suction connection under output pressure to a pressure connection, connectable with a consumer, and under consumer pressure, and a regulating device for setting and/or limiting a volume flow delivered by the delivery device.

Abstract: A valve assembly for a hydraulic discharge device and including a piston displaceable in a bore of a housing of the discharge device against a biasing force and having an outer surface, which sealingly engages an inner wall of the housing bore and blocks a channel opening into the bore so that the piston functions as a slide valve for this channel, the valve assembly further including a valve seat which, together with the piston, forms a seated valve.

Abstract: A compressor, in particular for a vehicle air conditioning system, with a housing, which contains a device for conveying a compressed medium driven by a drive shaft, designed as an axial piston machine and having at least one piston reciprocating in a cylinder block and a take-up plate connected to the piston working in combination with a swash plate rotating around a rotational axis, whereby the swash plate is connected to the drive shaft by a carrier and whereby the take-up plate encompasses a support device working in combination with a non-rotating thrust bearing.

Abstract: A pump comprises a housing and a pump unit arranged therein. The pump unit comprises a first and a second thrust plate and a ring arranged therebetween and having a through opening. The ring rests on the two thrust plates at least at an outer peripheral region thereof, and a pressure chamber is formed between the second thrust plate and the housing. A spacer supports the first thrust plate at a distance from the housing, and the spacer is associated at least in part with a radially inner surface area of the first thrust plate opposite the through opening. This allows deformation of the first thrust plate under operational pressure so as to hinder formation of a gap between the thrust plate and the pump insert.

Abstract: The invention relates to a hydraulic delivery device with a displacement unit which delivers a medium from a suction connection under output pressure to a pressure connection, connectable with a consumer, and under consumer pressure, and a regulating device for setting and/or limiting a volume flow delivered by the delivery device.

Abstract: A compressor for an air-conditioning system of a motor vehicle is proposed, which has a controllable compression medium feed mechanism powered by a drive shaft and which, for example, is powered by the combustion engine of the motor vehicle by a belt driven by a drive shaft, where the belt is coupled with the drive shaft of the compressor. The compressor is characterized by the drive wheel (29) having a belt pulley body (31) engaged with the belt (33) and coupled via an elastic coupling element (35) with the drive shaft (7), and by the drive shaft (7) being equipped with a torque limiting mechanism (predetermined fracture point (65)). In the case of another version, it is envisaged that the support mechanism (127) contains a projection (137) protruding from the take-up plate (11) and preferentially forming a single piece with this, as well as a supporting element (139).

Abstract: A vane pump is proposed which has a rotor which accommodates a number of vanes that can move in the radial direction, has a cam ring which surrounds the rotor and forms at least one suction region and one pressure region, and has at least one pressure plate, which forms a lateral boundary surface of the suction and pressure regions and, when the vane pump is operating, is loaded by pressure on its side facing away from the suction and pressure regions, the pump being defined in that that surface (17; 19) of the pressure plate (13; 15) which faces the rotor (5) is designed to be concave--when there is no pressure in the vane pump (1).

Abstract: A compressor, particularly suited for use in the motor vehicle air conditioning system, having a compact and simple design. The housing is constructed of a body portion having a first wall area which defines the cavity containing the pumping unit and is designed to withstand the internal cavity pressure. A second wall area, not designed to withstand the internal cavity pressure, cooperates with a housing cover to seal the housing. The second wall area is under tension and is attached to the body by welding or by bending the second wall area. The cover includes a pair of pressure cavities separated by concentric annular sealing bridges. The sealing bridges have axially offset sealing surfaces which cooperate with a valve plate to seal off the two chambers. The sealing surface of the radially outer bridge may be formed of any elastic material. A drive-shaft and swash plate cooperate with a take-up plate to operate one or more pistons. A drive plate, integral with, or attached, as by welding, etc.

Abstract: A compressor for an air-conditioning system of a motor vehicle is proposed, which has a controllable compression medium feed mechanism powered by a drive shaft and which, for example, is powered by the combustion engine of the motor vehicle by a belt driven by a drive shaft, where the belt is coupled with the drive shaft of the compressor. the compressor is characterized by the drive wheel (29) having a belt pully body (31) engaged with the belt (33) and coupled via an elastic coupling element (35) with the drive shaft (7), and by the drive shaft (7) being equipped with a torque limiting mechanism (predetermined fracture point (65)). In the case of another version, it is envisaged that the support mechanism (127) contains a projection (137) protruding from the take-up plate (11) and preferentially forming a single piece with this, as well as a supporting element (139).

Abstract: A valve assembly for controlling fluid flow to an actuator, including first and second throttles for controlling partial flows therethrough, which together form a full flow to the actuator and which function indepedently from each other and are formed each by a variable metering orifice, and a flow control valve for controlling fluid flow through the first throttle and including a valve spool and a spring for biasing the valve spool to a position of a maximum predetermined fluid flow through the first throttle.

Abstract: A pressure-limiting valve including a housing, a valve seat located in the housing bore, a sealing element displaceable in the bore between a closed position in which it engages the valve seat, and an open position in which it is spaced from said valve seat, and a spring for biasing the sealing element to the closed position thereof, with the valve seat being pressed into the housing bore, with a valve seat position being adjustable during the pressing-in process, and with continuous control of pressure-in forces.

Abstract: A valve assembly for controlling volume flow from a discharge device to an actuator and including a discharge throttle, and a flow control valve for controlling flow through the throttle and having a piston, and end portion of which overlaps a channel for returning excess fluid to a suction side of the discharge device and has an end region forming a seated valve preventing leakage past the end region, when the end region completely overlaps the return channel.