Radial piston pump

Details Radial piston pump Radial piston pump

1999-06-02

2001-08-28

Walberg, Teresa (Department: 3742)

Pumps

Expansible chamber type

Valved piston

C417S415000

Reexamination Certificate

active

06280162

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a radial piston pump as it is commonly used for hydraulic brake systems with an anti-lock function. Such pumps normally include an inlet valve and an outlet valve which are configured as check valves with a spring-biased steel ball forming the closure member. The inlet valve only permits a fluid flow from an inlet to a pump chamber, while the outlet valve only permits a fluid flow from the pump chamber to an outlet. One wall of the pump chamber is formed by the end surface of a movable piston which is driven by an eccentric gear to perform a reciprocating movement. When the piston moves to increase the volume of the pump chamber, fluid will enter the pump chamber through the inlet valve. With the volume of the pump chamber shrinking, the fluid is expelled through the outlet valve. Without any movement of the piston, the two valves are closed. Known pumps of this kind are expensive to manufacture due to the requirement of precision-machined components for each of the valves, such as the steel ball, a steel valve seat, a compression spring and a guide member for the steel ball in order to keep it aligned with the valve seat.
An object of the present invention is to provide a radial piston pump that is cheaper to manufacture by requiring a smaller number of parts and lesser precision in machining.
SUMMARY OF THE INVENTION
This object is achieved by a pump which provides cup seals as the inlet valve and the outlet valve. Such cup seals have a substantially V-shaped profile with one leg of the V forming a sleeve sealing a first cylindrical surface and the other leg forming a lip touching, with its outer edge, a second cylindrical surface opposite of the first one. If pressure is applied from the closed end of the V-profile, the lip is urged away from the second cylindrical surface and gives way for the pressure medium to pass the cup seal. If pressure is applied from the open side of the V-profile, the lip is pressed against the second cylindrical surface, thereby preventing any flow of pressure medium past the cup seal. The lip can form the outer leg of the V as well as the inner leg. If the lip is the outer leg, the sleeve is mounted on the pump piston. If the lip forms the inner leg, the sleeve is mounted in the bore.
Further details of the present invention will be explained by means of the accompanying drawings.


REFERENCES:
patent: 4381179 (1983-04-01), Pareja
patent: 4776773 (1988-10-01), Quartana, III
patent: 4988147 (1991-01-01), Zirps
patent: 5249935 (1993-10-01), Burgdorf
patent: 5291675 (1994-03-01), Matsuda et al.
patent: 5468127 (1995-11-01), Elliott et al.
patent: 5634338 (1997-06-01), Matsuda et al.
patent: 5975653 (1999-11-01), Zaviska
patent: 5993402 (1999-11-01), Sauer et al.
patent: 6116146 (2000-09-01), Steffes

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