PRESSURE FLUID PUMPING DEVICE WITH A RECIPROCATING PISTON PUMP

摘要

The intention is to reduce the structure-borne noise emission of the reciprocating piston pump. …The reciprocating piston pump (11) is assigned an outlet valve (24) which has a valve seat (23) and a valve closing element (ball 25) accommodated in a cavity (26) and loaded by a closing spring. Only one outlet bore (30) branches off from the cavity (26), starting radially from the circumferential region of the valve seat (23). The cavity-side opening of the outlet bore (30) extends at least approximately between the valve seat (23) and the closing-spring end of the gap of least cross-section formed between the valve closing element (ball 25) and the inner circumference of the cavity (26). A slowed opening movement of the valve closing element (ball 25) is thereby obtained, an opening gap with its largest cross-section of passage in the region of the outlet bore (30) opening up. The delivery flow, rising slowly as the outlet valve (24) opens, results in a slower rate of change of the force in the drive train of the reciprocating piston pump (11) and a reduced emission of structure-borne noise. …The pump installation can be used, for example, in hydraulic motor-driven brake systems with an anti-lock system and/or a drive-slip control (traction control) system. ……