| 摘要 |
A piston pump ( 10 ) for a hydraulic consumer of an electronically controlled vehicle brake system, carries a stepped piston ( 50, 50' ) and centers a sealing assembly ( 26, 26' ) which is retained in an axial direction Ax by a step ( 52, 52' ) on the stepped piston ( 50, 50' ), on the one hand, and is retained by a spring cage ( 53, 53' ), on the other hand. The stepped piston ( 50, 50' ) includes a plane support ( 54, 54' ) for plane support legs ( 55 a,b,c; 55 a,b,c') of the spring cage ( 53, 53' ) The stepped piston ( 50, 50' ) includes radially inwards, with respect to the support ( 54, 54' ), a stepped bore ( 56, 56' ), with the bore ( 56, 56' ) accommodating centering legs ( 57 a,b,c; 57 a,b,c') of the spring cage ( 53, 53' ). Coaxially as well as inside the stepped bore ( 56, 56' ), a spring-loaded valve member ( 59, 59' ) of a non-return valve is arranged. A resetting spring ( 38 ) is supported on an abutment ( 41 ) of the bushing ( 18, 19 ) on the one hand and on the spring cage ( 53, 53' ) on the other hand The bushing ( 18, 19 ) is provided with a stop ( 63, 63' ) for the stepped piston ( 50, 50' ), so that stepped piston ( 50, 50' ), resetting spring ( 38 ), non-return valve, and sealing assembly ( 26 ) are arranged within the bushing ( 18, 19 ) as a subassembly that can be handled independently.
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