Piston pump
OwnerErnst-Dieter Schaeferinventor
Life of this patent
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Abstract
The invention relates to a piston pump (10) for a hydraulic vehicle brake system that has traction control. The invention proposes embodying the piston pump (10) with a piston ring (24), for instance a PTFE, which ring serves as both a sealing and a guide ring. The invention lessens the effort and expense of assembly as well as the production costs for the piston pump (10). To achieve reliable sealing, the invention proposes embodying the piston ring (24) with an internal cone on its side toward a pump chamber (18), so that during a pumping stroke, the piston ring (24) is subjected to pressure from the pump chamber (18) and is pressed into sealing contact against a pump bore (12).
Claims9
A piston pump, having a pump piston, which is drivable to execute an axially reciprocating stroke motion in a pump housing, and which in its stroke motion alternatingly increases (reverse stroke) and decreases (pumping stroke) a volume of a pump chamber, which pump chamber is an axial portion of the pump bore and is defined on one side by the pump piston, and having a piston ring, which is disposed on an end, toward the pump chamber, of the pump piston, characterized in that the piston ring (24) forms a sealing and guide ring that is not loaded in the axial direction and that in any case during the pumping stroke seals off the pump piston (16) in the pump bore (12), and which ring guides the pump piston (16) axially displaceably in the pump bore (12).
Dependencies are inferred from the claim text.