Piston pump
AssigneeRobert Bosch GmbH
InventorsEdgar Schmitt, Norbert Alaze, Ernst-Dieter Schaefer, Marcus Egle, Jochen Braun, Ursula Eckstein, Peter Zimmermann, Christian Debusmann, Manfred Dreyer
Life of this patent
Estimating the term…
Abstract
In piston pumps for brake systems used until now, there were often noise problems, from pressure pulsations. In the piston pump for brake systems proposed here, a pulsation-smoothing device (40) that functions effectively well is provided in the region of the outlet valve (24). As a result, substantially less noise occurs, and the durability of the piston pump (1) is substantially better. The piston pump is used essentially in traction-controlled motor vehicle brake systems.
Claims17
A piston pump, having a pump piston (14) supported displaceably in a pump housing (2), having an inlet valve (22), having an outlet valve (24), and having a compression chamber (20) provided between the inlet valve (22) and the outlet valve (24) in the pump housing (2), which chamber increases in size upon an intake stroke of the pump piston (14) and decreases in size upon a compression stroke of the pump piston (14), characterized in that a pulsation-smoothing device (40) is disposed in the region of the outlet valve (24).
The piston pump of one of the foregoing claims, characterized in that the outlet valve (24) has a closing body (24b) and an inlet side (28), and that a rear valve chamber (53) is located on a side of the closing body (24b) toward the inlet side (28), and that a disconnection point (52) is provided between the outflow chamber (30) and the rear valve chamber (53). (FIGS. 5, 8, 9,10)
The piston pump of one of the foregoing claims, characterized in that a turbulence-causing throttle (60) is disposed between the outflow chamber (30) and the outflow conduit (10). (FIGS. 9,10)
The piston pump of one of the foregoing claims, characterized in that a barometric cell (54) containing a compressible counterpart chamber (36) is disposed in the outflow chamber (30). (FIGS. 6, 7)
Dependencies are inferred from the claim text.