| 摘要 |
PCT No. PCT/DE97/01101 Sec. 371 Date May 18, 1998 Sec. 102(e) Date May 18, 1998 PCT Filed Jun. 3, 1997 PCT Pub. No. WO98/12434 PCT Pub. Date Mar. 26, 1998A piston pump for pumping hydraulic fluid, especially for vehicle brake systems having a stepped piston axially displaceable in a pump space. The stepped piston in order to reduce the production costs comprises a cylinder of substantially constant outer diameter and a bush which is held axially nondisplaceably on the cylinder, by being press-fitted onto the cylinder. An elastomer seal is slipped onto a cylinder portion defined by the bush seals off the cylinder from the wall of the pump space and divides the pump space into two pump chambers of variable chamber volume.
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