Piston pump
AssigneeRobert Bosch GmbH
InventorHeinz Siegel
Life of this patent
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Abstract
The invention relates to a piston pump, for instance for an electrohydraulic vehicle brake system. The invention proposes that a pump piston, on an end toward an eccentric element, be sealed off with a sealing ring, such as a quad ring, that has two axially spaced-apart sealing lips, which sealing ring has radial openings, and also proposes that interstices between the axially spaced-apart sealing lips be connected, through a fluid line, to a fluid supply container from which the piston pump aspirates fluid, or to a pump inlet, whereby in the event of a leak of a sealing lip, the piston pump will aspirate brake fluid through the fluid line and prevent the piston pump from aspirating air from the direction of an eccentric element.
Claims7
A piston pump, comprising a pump piston that is received axially displaceably in a pump bore in a pump housing and is driven in an axially reciprocating stroke motion in the pump bore, a sealing ring that is disposed, surrounding the pump piston, between a pump inlet and an eccentric element in the pump bore and that performs sealing between the pump piston and the pump housing, said sealing ring (50) having two axially spaced-apart encompassing sealing points (52, 54, 56, 58), and that the piston pump (10) has a fluid line (66), connecting an interstice (60, 62) between the two sealing points (52, 54, 56, 58) of the sealing ring (50) to a supply (68) of fluid to be pumped by the piston pump (10).
Dependencies are inferred from the claim text.