Luk Fahrzeug-hydraulik Gmbh & Co. Kg

Waldemar Hebisch

Van Doan Nguyen

Dirk Webert

Nguyen Van Doan

Markus Meitinger

Karl Prinzhorn

In a preferred embodiment of the present invention, a positive-displacement pump, in particular a vane cell pump, having a pump element, in particular a rotor, which is situated within a contour ring and rotatable between two side surfaces where a limited coating is located on at least one of the side surfaces.

Pump with side surface coating

A rotary vane pump for delivering a fluid and which has a housing which accommodates a rotatable delivery device () and which includes a feed channel () for receiving the fluid from a tank or the like. The feed channel communicates with a jet chamber () which in turn communicates via one or more suction channels () to at least two suction chambers which communicate with the intake region of the pump. An injector device () injects a pressurized fluid into the jet chamber to entrain and advance the fluid entering from the feed channel (), and means are provided for influencing the flow of the fluid so as to achieve essentially the same volume flow into the two suction chambers.

Rotary vane pump

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.

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Gross Gerau, Germany

Waldemar Hebisch