| 摘要 |
PCT No. PCT/EP91/01277 Sec. 371 Date May 4, 1992 Sec. 102(e) Date May 4, 1992 PCT Filed Jul. 9, 1991 PCT Pub. No. WO92/04216 PCT Pub. Date Mar. 19, 1992.A piston pump is described which adapts the output flow to the supply flow which is intended in particular for use in a hydraulic brake slip control apparatus, the pump having a pump housing (2) with working chambers (9, 10) which are connectible to supply lines via an inlet valve (5) and an outlet valve (6). Working pistons (15) defining in part the working chambers are cyclically movable to increase and decrease the volume of the working chambers (9, 10) and are guided in cylinder bores (11, 12) and driven by a an eccentric (14) in order to perform stroke movements. The cylinder bores (11, 12) also receive charging pistons (18) which also define in part the working chambers (9, 10) and which are movable to decrease the volume of the working chambers (9, 10) by way of compression springs (20) supported on the pump housing (2) and which, via a pin (21), can be pressed against the working pistons (15). The charging pistons (18) are limited in their movement out of the working chambers (9, 10) by stops on the pump housing (2). The charging pistons (18) are moved inwardly, overcoming the frictional grip of a seal (22) to reduce the working chamber volume and thus the flow rate of the piston pump in order to avoid cavitation, in the event that the quantity of pressure fluid delivered via the inlet valves (5) does not suffice to preserve a predetermined suction pressure in the working chambers (9, 10).
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