Abstract: A rotary pump for producing a pressure medium flow for a consumer, includes a pump housing in which a curved ring is inserted. A rotor is rotatably borne on a drive shaft in the curved ring. The rotor carries displacement elements at a tangential distance to one another which form a pump chamber between the rotor and the curved ring with a suction opening. A pressure medium-activated adjusting device is operable for changing the eccentricity of the curved ring relative to the rotor, and includes a first pressure chamber and a second pressure chamber fluidically and tangentially distanced from the first pressure chamber The pressure in the first and second pressure chambers is controlled by a flow control valve, the low pressure chamber of which communicates with a first control line on a downstream side of a metering orifice.

Abstract: A rotary pump for producing a pressure medium flow for a consumer, includes a pump housing in which a curved ring is inserted. A rotor is rotatably borne on a drive shaft in the curved ring. The rotor carries displacement elements at a tangential distance to one another which form a pump chamber between the rotor and the curved ring with a suction opening. A pressure medium-activated adjusting device is operable for changing the eccentricity of the curved ring relative to the rotor, and includes a first pressure chamber and a second pressure chamber fluidically and tangentially distanced from the first pressure chamber The pressure in the first and second pressure chambers is controlled by a flow control valve, the low pressure chamber of which communicates with a first control line on a downstream side of a metering orifice.

Abstract: Power steering systems in which an electric motor which is fed by the on-board power system applies the assisting steering force are being used to an increasing degree in vehicles. However, the on-board power system is very heavily loaded by the growing number of electric drives and loads, for example, actuating motors, heating elements and air conditioning systems, which are integrated in the vehicles. Solutions with a relatively high on-board power system voltage of, for example, 42 volts may require extensive resetting of all the relevant electric components to this higher voltage. In order to be able to make available an electrical energy supply for the electric motor independently of the on-board power system, in a power steering system, the electric motor is controlled by an electronic control unit in order to act on the toothed rack of the steering system in a manner which supplies power assistance force.

Abstract: A hydraulic power-assisted steering system, in particular for motor vehicles, has a hydraulic pump for generating hydraulic pressure for assisting the steering and an electromagnetic valve, in addition to a motor for driving the hydraulic pump. The hydraulic pump can be decoupled from the motor by a coupling.

Abstract: A hydraulic power-assisted steering system, in particular for motor vehicles, has a hydraulic pump for generating hydraulic pressure for assisting the steering and an electromagnetic valve, in addition to a motor for driving the hydraulic pump. The hydraulic pump can be decoupled from the motor by means of a coupling.

Abstract: A positive-displacement pump for conveying a pressure medium from a container to a consumer, in particular a power steering system includes, a pump package (2); the pump package includes a rotor (3), a cam ring (4) and several operating slides (5) has been inserted into the interior of a housing (1). A bypass flow control valve (11) with a piston (11A) is used for controlling an actual flow. A throttle of the bypass flow control valve (11) is formed by an orifice (12), which is fixed in place on the housing and has an adjustable cross-sectional surface. The cross-sectional surface of the orifice (12) is increased in case of an increasing pressure being applied to the orifice (12). The orifice (12) is arranged so it cannot be displaced in relation to the housing (1). By use of a pressure occurring at the orifice (12), the piston is exclusively displaced against the force of the spring (15), so that the cross-sectional surface of the orifice (12) can be changed as a function of the pressure.

Abstract: A container for a hydraulic medium made of a plastic material has a container cup (1), which can be closed by a cover (2). The positions of the container cup (1) and the cover (2) in respect to each other are matched along a joint (7), and are fixed in place by a fitting insert (8). Faces (10, 11), which adjoin each other, are respectively arranged on the container cup (1) and the cover (2). A welding plate (12), which is also made of a plastic material, extends over the adjoining surfaces of the container cup (1) and the cover (2), and is matched to the adjoining faces (10, 11). The container cup (1) and the cover (2) are sealingly connected with each other via the welding plate (12) by an inertia welding process so as to prevent particles of the plastic material, which are generated in the form of lateral welding waste in the course of the inertia welding process, to reach the interior of the container for the hydraulic medium.

Abstract: A vane cell pump with a cup-shaped case top (2) for receiving a pump package (3). The cup-shaped case top (2) is axially extended and contains a damper (14) for the purpose of an effective pressure fluctuation absorption. The case top (2) has an inwardly projecting extension (6) for supporting the pump package (3) in one embodiment. A piston (15), which can be displaced against a spring (18), can be arranged on the extension (6) for improving the damper action in another embodiment.

Abstract: In a vane cell pump for pumping a pressure fluid from a container to a consumer, all the essential components and functional characteristics are accommodated in a bearing housing (10). The components include a suction connection (13) for connecting to the container, a pressure connection (14) for connecting to the consumer, a flow regulating valve (15) for regulating the pressure fluid pumped to the pressure connection (15), a pressure limiting valve (16) and suction and pressure conduits, which connect the work chambers to the suction connection (13), flow regulating valve (15), and pressure limiting valve (16). Also located in the bearing housing (10) is the sole radial bearing point of a drive shaft (12), by which a rotor (5) is supported in a cam ring (4). Between the cam ring (4), the rotor (5) and vanes (6) are inserted into it, so that work chambers are formed, which are defined in the axial direction by two control plates (7, 8).

Abstract: In a displacement pump for pumping pressure medium out of a container to a consumer, in particular a servo-assisted steering system for motor vehicles, a pump package (2) is inserted into the interior of a housing (1). The pump package (2) comprises a rotor (3), a cam ring (4) and a plurality of operating rods (5). Between the cam ring (4) and the rotor (3), work chambers divided by the operating rods (5) are formed, which are bounded in the axial direction by control plates (8, 9). A bypass flow limiting to valve (11) is used to regulate an effective flow. A throttle (12) of the bypass flow limiting valve (11) is formed by at least one bore. The throttle (12) is embodied in a throttle insert (13), which to adjust a characteristic effective flow curve can be mounted in various positions between a pressure chamber of the pump and the bypass flow limiting valve (11). To that end, the throttle insert (13) is integrated with a control plate (9).

Abstract: A vane cell (sliding vane) pump having a flow control valve (13) with a control piston (17). The control piston (17) operates as a pressure regulator, wherein a differential pressure that occurs with increasing pump speed is used as the measuring valve for the directly diverted conveyed flow. The directly diverted conveyed flow is introduced via a spray channel (25) into a distributing section (20), which is connected via curved suction arms (21,22) with suction zones (23,24). The distributing section (20) and the suction arms (21,22) nestle against a driveshaft such that the driveshaft acts as a flow divider. Additionally, the spray channel (25) terminates at the center of the distributing section (20) so that the sprayed off oil and the suction oil conveyed by the suction channel (18) is evenly divided between both suction zones (23,24). Since the hydraulic oil lubricates the driveshaft (12), no cavitation or abrasion can occur in this area.

Abstract: The invention relates to a vane cell pump with a control plate (8) and an end plate (6), between which a pump package (1) is located. The control plate (8) and the end plate (6) have suction and compression chambers (12, 12A and 13, 13A, respectively) opposite one another. While the control plate (8) controls the inflow and outflow of oil, the end plate (6) has a function of guiding the oil. According to the invention, the control edges (15, 15A, 16, 16A, 17, 17A, 18, 18A) on the end plate (6) are recessed relative to the control edges of the control plate (8). This provision enables more-economical manufacture.

Abstract: The invention concerns a suction-controlled vane-cell pump whose pumped flow does not increase further above a determined speed but remains practically constant. Radially movable vanes (4), arranged in a rotor (2), form working chambers (12). Between the vanes (4) the rotor (2) has control slots (21) which cooperate with several outlets (22 or 22A) of a front plate (5) located in a pressure zone. The control slots (21) and the outlets (22 or 22A) are dimensioned so that a reflux of oil under pressure can be avoided from a higher-pressure working chamber (12) into a lower-pressure working chamber. The outlets (22 and 22A) are closed by a valve (24) with movable tongues (25, 25A). During the opening stroke, the tongues (25, 25A) rest on a supporting body (26). Suction openings (13 and 13A) communicate with a suction chamber (14) through throttle bores (31, 31A) in order to limit the suction current. Wear due to cavitation can be avoided by the invention.

Abstract: A cover, especially for an oil tank, has a locking device with flexible arm carrying locking elements flexibly slidable against a bayonet curved track ridge of a tank opening or tank neck for closure of the tank. The locking device cover is capable of being rotated to close the tank opening without manual downward pressure. A bayonet curved track ridge has spring pressure of the flexible arms eliminating need for manual pressure. The construction is a single integral member made from a plate of spring steel, or made from plastic, of suitable flexibility. It has a bed plate with prongs formed from the edges of an aperture through the bed plate for gripping a pin carried by the cover to secure the locking device to the cover. The flexible arms extend in curved contour from the bed plate and have outer free ends on which the locking elements are located which slidably engage the bayonet track ridge in the tank opening or neck for limited rotation up to a stop for locking the cover to a tank.

Abstract: A vane type pump has an elongated pump housing through which the drive shaft of the pump passes. The usual components of the pump comprising a rotor which carries vanes within a cam ring is disposed between an inner end wall of the housing and a pressure plate wherein the pressure plate has pressure recesses or pockets. Damping chambers are provided in the elongated housing generally parallel to the drive shaft and substantially co-extensive with the housing bore that carries the drive shaft. Thus, very large volume damping chambers are provided for smoothing out pump pulsations in the course of operation.

Abstract: A regulatable drive for speed control of the cooling fan of an internal combustion engine comprises fluid feed from a tank to the suction side of a pump via a suction passage wherein flow is controlled by a regulatable multi-position valve. The pump provides pressure feed to the suction side of a fluid motor that operates the fan. A bypass passage connects the suction passage of the fluid pump through the regulatable valve to the suction side of the fluid motor. The regulatable valve is actuated for control of suction feed to the pump responsive to fan speed via control circuitry which may also be responsive to engine temperature.

Abstract: A pump is constructed using a magnetic piston in a cylinder having an oil feed thereto, for pumping oil to either pressure chamber of a steering servomotor. The pump cylinder has a chamber on each side of the pump piston which chambers discharge pressure oil into a respective servomotor chamber. The magnetic piston is actuated by an electromagnetic system under control of a manually operated steering wheel. The pump construction is such that the length of traverse of the pump piston on a pressure movement is shorter than the piston traverse of a servomotor chamber being pressurized. The pump chambers discharge directly into respective servomotor chambers without the need for steering control valving.

Abstract: A rotary slide vane pump for steering booster systems has a flow control valve which bypasses flow from outlet side to suction side with increase in speed as heretofore known. The flow channels or passages that conduct bypass flow change the direction of the flow at a juncture point between passages, such directional change being a right angle, radially downstream from the bypass valve to longitudinally at the point of juncture to the suction side, likewise as heretofore known. In the present invention there is provided a transition piece between the channels at the right angle juncture in the form of a screw in the pump body and having a flat face disposed flush with the longitudinal channel and transversely of the radial channel. The provision of such transition piece has been found to effect an increase in suction pressure when bypass flow is added to normal suction flow, such increase being over and above that effected by the prior art.

Abstract: A seal assembly comprised of a pair of concentric rings radially spaced with a tortuous or convoluted channel therebetween in which is carried a rubber-like compressible seal element that extends beyond the radial surfaces of the rings. The inner ring has passages for flow between registering passages of assembled components, e.g., radial piston pumps. Such passages are inside the perimeter of the seal element and within convolutions. The outer ring has apertures for passage of screws for assembling the components together, thereby compressing the sealing element during assembly to effect a tight seal. The compressed material is displaced into adjoining concavities molded into the sealing element within the thickness of the concentric carrier rings.

Abstract: A gear pump having an annular internal tooth gear and an external tooth gear eccentrically rotative therein is provided with a choke bore at the inlet side of the pump and a series of outlet pressure bores. The outlet bores are valved with individual check valves so as to pass pressure oil from the pressure pockets between the relatively moving gear teeth which pockets diminish in volume at the outlet side of the pump as the teeth move therepast and the pressure pockets discharge into the outlet bores. Where a pocket is insufficiently filled to effect the pressure needed for opening the first valves moved pass by the pressure pockets, the pressure increases with continued rotation as pocket volume decreases. The increase in pressure in the pockets with volume reduction ultimately opens an outlet bore valve to effect discharge to a common high pressure chamber.