Patent ID: 7237474

Claim:
A piston pump ( 18 ) for a hydraulic unit of an electronically controllable vehicle brake system, comprising a pump housing ( 10 ) with at least one installation space ( 12 ), a bushing ( 24 ) that is inserted into the installation space ( 12 ) and axially guides a pump piston ( 16 ) that can be driven into a stroke motion, at least one pressure chamber ( 50 ) whose volume can be changed by the stroke motion of the pump piston ( 16 ), a pressure fluid inlet ( 20 ) and pressure fluid outlet ( 82 ) connected to the pressure chamber, the pressure fluid outlet ( 82 ) begins at the face end of the bushing and is routed at least partway along a section of the circumferential surface of the bushing ( 24 ), and a filter and a throttle in the region of the section extending along the circumferential surface, the filter and throttle being of one piece with the bushing ( 24 ).