| 摘要 |
An expeller pump with a variable delivery volume, in particular a single-stroke vane pump, for producing a stream of pressure medium to an actuator has a housing in which a rotor is mounted. The rotor is surrounded by a cam ring. Between the rotor and the cam ring, working chambers are formed which are bounded by rotor elements and whose volume can be adjusted by changing the eccentricity between the rotor and the cam ring. The cam ring is surrounded by an outer ring which is arranged in the housing and which keeps the cam ring freely moving. Two pressure chambers to which pressure can be applied in order to displace the cam ring via fluid connections are formed between the outer ring and the cam ring. The fluid connections are each formed from at least one bore in the housing and one corresponding bore in the outer ring. A relief bore (26) is provided in order to relieve a radial gap (27) between the housing (2) and the outer ring (3) of leakage fluids from the fluid connections leading to the pressure chambers. |
