PISTON PUMP

摘要

The invention relates to a reciprocating pump (1), having a step piston (4) and intended as hydraulic pump of a slip-controlled vehicle braking system . According to the invention, a piston step (8) of the step piston (4) delimits a stepped space (36) which by way of a differential pressure valve (37) communicates with a pump outlet (34). The stepped space (36) suctions and displaces in a direction opposite to that of a displacement space (25), but in smaller quantities; this results in a more even brake fluid volume flow in a pump outlet (34) and lower pressure pulsations.