Patent ID: 6389955
Filing Date: 2002-05-21
Classification: B60T,F04B

Abstract:
A pump assembly for a slip-controlled hydraulic brake system of a vehicle, comprising a pump motor which drives an eccentric element to rotate in a pump housing, a pump piston which is axially displaceably received in a cylinder bore (14) in the pump housing and is driveable with the eccentric element to execute an axially reciprocating stroke motion in the cylinder bore (14), a seal (54) toward the eccentric element, and a drain (60) for diverting leaking fluid, from the cylinder bore to an outside of the pump housing from between the seal (54) element and the eccentric element (18), the pump housing (12) has a groove (52), disposed on the eccentric element side of the seal (54) and surrounding the pump piston (16), from which groove the drain (60) discharges leakage fluid from the cylinder, and a liquid-permeable ring (56) is inserted into the groove (52) juxtaposed the seal (54).