Abstract: A hydraulic transmission control system including a vane pump including a stroke ring defining a compartment. An outlet line and an inlet line are fluidly connected to the compartment. A control pressure chamber and a compensation chamber are defined adjacent to opposite sides of the stroke ring, each for varying a pump outlet pressure based on a pressure change within the chambers. A pump controller is connected to the outlet line and the pressure control chamber for adjusting a pressure in the pressure control chamber. The outlet line is further connected to the compensation chamber, a primary hydraulic circuit and a primary pressure control valve. A secondary hydraulic circuit is connected to the primary pressure control valve. A shift valve is disposed between the outlet line and the primary control valve and configured to selectively connect the pump controller and the primary pressure control.

Abstract: A variable displacement transmission pump having a controller for adjusting the displaced volume, which controller actuates corresponding adjuster actuators of the adjustable pump via a control valve, so that the pump can be adjusted from minimum to maximum displaced volume in order to achieve a constant pump outlet pressure for supplying a hydraulically operated transmission, wherein for different operating points of both the adjustable pump and the transmission, the input variables of the controller are adjusted in such a way that, independently of the individual operating points, the overall damping of the control system comprising pump and transmission—that is, using corresponding influence variables from these systems—can be maintained substantially constant under variable operating conditions by means of adjustable controller amplification.

Abstract: A variable displacement pump is disclosed for hydraulic gearbox control systems, in particular a vane pump, having a variable stroke volume and having a pump regulator for outflow pressure regulation, in which the outlet pressure of the pump acts in a compensation chamber and a regulation pressure, which can be set by the pump regulator, acts in a regulation pressure chamber on an adjustable stroke ring, wherein the pressure in the regulation pressure chamber and an additional spring force adjust the stroke ring in the direction of maximum pivoting out.

Abstract: A variable displacement transmission pump having a controller for adjusting the displaced volume, which controller actuates corresponding adjuster actuators of the adjustable pump via a control valve, so that the pump can be adjusted from minimum to maximum displaced volume in order to achieve a constant pump outlet pressure for supplying a hydraulically operated transmission, wherein for different operating points of both the adjustable pump and the transmission, the input variables of the controller are adjusted in such a way that, independently of the individual operating points, the overall damping of the control system comprising pump and transmission—that is, using corresponding influence variables from these systems—can be maintained substantially constant under variable operating conditions by means of adjustable controller amplification.

Abstract: A sealing device for a swivel motor includes an outer part and an inner part as well as at least one working chamber located between them. The sealing device seals the working chamber and comprises at least two rectangular sealing elements housed in a groove enclosed in the outer and/or inner part running essentially parallel to the swivel axis of the swivel motor. Each of the sealing elements comprises at least one rectangular sealing part and at least one gasket.

Abstract: The invention relates to a sealing device for a swivel motor comprising an outer part and an inner part as well as at least one working chamber located between them, which seals the working chamber and comprises at least two rectangular sealing element housed in a groove enclosed in the outer and/or inner part running essentially parallel to the swivel axis of the swivel motor, each of which comprises at least one rectangular sealing plant and at least one gasket.

Abstract: A power-steering pump for a motor vehicle is used to pump fluid to an additional fluid-driven device such as a hydraulic motor of a ventilation fan. The pump has a flow-regulating valve and an injector device, where a jet of excess fluid streaming off the flow-regulating valve generates a suction effect that pulls return fluid from a suction pipe or a reservoir tank into the intake area of the pump. A fluid stream returning from the additional fluid-driven device enters the intake area through one or more fluid return channels that are separate from the injector channel.

Abstract: A power-steering pump for a motor vehicle is used to pump fluid to an additional fluid-driven device such as a hydraulic motor of a ventilation fan. The pump has a flow-regulating valve and an injector device, where a jet of excess fluid streaming off the flow-regulating valve generates a suction effect that pulls return fluid from a suction pipe or a reservoir tank into the intake area of the pump. A fluid stream returning from the additional fluid-driven device enters the intake area through one or more fluid return channels that are separate from the injector channel.

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: 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 pump for conveying a medium, in particular hydraulic oil, comprising a flow-control valve for controlling the flow of medium conveyed by the pump and a discharge channel (7) releasable by the flow-control valve. In order to prevent cavitation, a flow divider (17) is provided for dividing the discharge jet flowing into the discharge channel (7) and extends into the said discharge channel (7), and is spaced by a distance (a) from an orifice (9) of the discharge channel (7) facing the flow-control valve.

Abstract: A flow-regulating arrangement for a hydraulic transport device such as a vane-cell pump includes partial-transport flow throttles which operate independently of one another and which are arranged in parallel to deliver output of the hydraulic transporting device to a hydraulic load. One of the partial transport flow throttles responds to the pressure difference between working pressure of the hydraulic transporting device and pressure within a pressure chamber internal to the device.

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 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.