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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 retain

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 (55a,b,c; 55a,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 (57a,b,c; 57a,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.

대표청구항 ▼

What is claimed is: 1. A piston pump (10) for supplying pressure fluid into a hydraulic consumer of an electronically controlled vehicle brake system, comprising a stepped piston (50, 50') which is arranged in a stepped bore (39, 40) of an accommodating member (3) so as to be movable within a bushi

What is claimed is: 1. A piston pump (10) for supplying pressure fluid into a hydraulic consumer of an electronically controlled vehicle brake system, comprising a stepped piston (50, 50') which is arranged in a stepped bore (39, 40) of an accommodating member (3) so as to be movable within a bushing (18, 19) in an axial direction Ax, the stepped piston (50, 50') being partly designed like a hollow tube at least at one end (51, 51'), a displacement chamber (24, 25) being limited by the end (50, 50') of the stepped piston (50, 50') and having a stepped design at its outside periphery, and carrying and centering a sealing assembly (26, 26') which is retained in the 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') including radially inwards with respect to the sealing assembly (26, 26') a plane support (54, 54') for plane support legs (55a,b,c; 55a,b,c') of the spring cage (53, 53'), the plane support (54, 54') being provided orthogonally to the axial direction Ax, the stepped piston (50, 50') including radially inwards, with respect to the support (54, 54'), a stepped bore (56, 56'), with the bore (56, 56') accommodating centering legs (57a,b,c; 57a,b,c') of the spring cage (53, 53'), a spring-loaded valve member (59, 59') of a non-return valve being arranged coaxially inside the stepped bore (56, 56'), which valve member serves to ventilate the displacement chamber (24, 25), a resetting spring (38) being arranged in the displacement chamber (24, 25) and 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) being provided at one end with a stop (63, 63') for the stepped piston (50, 50'), said stop (63, 63') in a radial direction R being smaller than the diameter of the stepped piston (50, 50'), while at the opposite end of the bushing (18, 19) at least one abutment (41) for the resetting spring (38) is attached 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. 2. The piston pump as claimed in claim 1, wherein the plane support (54, 54') has a mean diameter which corresponds essentially with the diameter of the piston resetting spring (38). 3. The piston pump as claimed in claim 1, wherein the support legs (55a, 55b, 55c) are annularly interconnected by means of webs (66, 67, 68, 69, 70, 71). 4. The piston pump as claimed in claim 1, wherein the spring cage (53) includes additional centering legs (58a,b,c) for the resetting spring (38). 5. The piston pump as claimed in claim 4, wherein the centering legs (58a,b,c) for the resetting spring (38) and the centering legs (57a,b,c) for the spring cage (53) are arranged in each case at right angles relative to the support legs (55a,b,c). 6. The piston pump as claimed in claim 5, wherein the centering legs (57a,b,c) for the spring cage (53) and the centering legs (58a,b,c) for the resetting spring (38) point in diametrically opposed directions. 7. The piston pump as claimed in claim 4, wherein the centering legs (57a,b,c) for the spring cage (53) and the centering legs (58a,b,c) for the resetting spring (38) have a separate design, with the centering legs (57a,b,c) for the resetting spring (38) extending over the resetting spring (38) in a radially outward direction. 8. The piston pump as claimed in claim 1, wherein the support legs (55a,b,c; 55a,b,c') and the centering legs (57a,b,c; 57a,b,c') of the spring cage (53, 53') are alternately provided in a circumferential direction. 9. The piston pump as claimed in claim 8, wherein at least three support legs (55a,b,c; 55a,b,c') and at least three centering legs (57a,b,c; 57a,b,c') are provided in each case. 10. The piston pump (10) as claimed in claim 1, wherein the centering legs (57a,b,c') for the spring cage (53') and leg portions (64a,b,c) for centering the resetting spring (38) are designed integrally, with the leg portions (64a,b,c) extending radially inwards into the helical resetting spring (38). 11. The piston pump (10) as claimed in claim 1, wherein the spring cage (53, 53') has means for (44a,b,c;44a,b,c') limiting an opening stroke of the valve member (59, 59'). 12. The piston pump as claimed in claim 11, wherein the means (44a,b,c; 44a,b,c') are designed as legs against which the valve member (59, 59') will bear after a defined opening stroke. 13. The piston pump as claimed in claim 12, wherein the legs are arranged so as to be distributed in a circumferential direction of the spring cage (53, 53'). 14. The piston pump (10) as claimed in claim 1, wherein the spring cage (53, 53') is configured as an integral sheet-metal shaped part, in that the material of the spring cage (53, 53') has a uniform thickness, and in that the legs and the stops are provided as punched-out jogs or impressions of the sheet-metal material.