Pump assembly for a slip-controlled hydraulic brake system for a vehicle
AssigneeRobert Bosch GmbH
InventorErnst-Dieter Schaefer
Life of this patent
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Abstract
A pump assembly having a piston pump, which is driven by an eccentric element. To prevent leakage brake fluid from reaching an eccentric element chamber, a groove surrounds the pump piston in the pump housing and a seal and a porous metal sintered ring is inserted into the groove. A drain which extends obliquely downwardly from the groove drains leakage fluid from the sintered ring.
Claims5
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).
Dependencies are inferred from the claim text.