Piston Pump
AssigneeRobert Bosch GmbH
InventorsJens Norberg, Patrick Schellnegger, Andreas Lechler, Oliver Gaertner
Life of this patent
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Abstract
A reciprocating pump, in particular a hydraulic pump of a slip-controlled vehicle braking system, includes a step piston, a differential pressure valve, and a pump outlet. The step piston includes a piston step that delimits a stepped space which is in communication with the pump outlet via the differential pressure valve. The piston step is configured such that the step space undergoes suction and displacement in a direction opposite to a displacement space, and in smaller quantities than suction and displacement in the displacement space, such that brake fluid volume flow in the pump outlet is evened out, and such that pressure pulsations are inhibited.
Claims5
A piston pump, comprising:
- a pump outlet
- a valve;
- a stepped piston that includes a piston step;
- and
- a body that includes a stepped piston bore, the stepped piston drivable in a reciprocating stroke movement in the stepped piston bore, and the stepped piston bore having:
- a displacement chamber in communication with the pump outlet, located on a displacement side of the stepped piston, and delimited on one side by the stepped piston, the displacement chamber configured such that a volume of the displacement chamber reduces as the stepped piston undergoes a forward stroke and enlarges as the stepped piston undergoes a return stroke opposite to the forward stroke;
- and
- a step chamber in communication with the pump outlet via the valve, located on a side of the piston pump facing away from the displacement chamber, and having a cross-section that is smaller than a cross-section of the displacement chamber, the step chamber configured such that a volume of the step chamber enlarges as the stepped piston undergoes the forward stroke and reduces as the stepped piston undergoes the return stroke.
Dependencies are inferred from the claim text.