VERSTELLBARE FLUEGELZELLENPUMPE

In an adjustable vane-type pump, there is provided an idle stroke adjusting device for variation of the pre-compression. The device comprises a laterally arranged adjustable supporting element having a substantially planar supporting surface bearing against the curved supporting surface area of the cam ring. The plane of the supporting surface of the supporting element is inclined relative to the plane which is defined by the joint axis of the delivery-limiting device and the pressure-control device as well as by the rotor axis. The curved supporting surface area of the cam ring is formed by the cylindrical peripheral surface of the cam ring. By using this extremely straightforward idle stroke adjusting device, wherein the idle stroke adjustment changes in response to the output pressure and the flow rate, respectively, a more favorable noise emission over the entire operating range of the pump is accomplished.