US 6,280,162 B1 · Radial piston pump

Abstract

A pump includes a pump housing with a bore, an inlet and an outlet, a piston movable in the bore, and an inlet valve and an outlet valve which are formed by a cup seal. The piston has a portion of a large diameter and a portion of a small diameter, each of the portions extending through one of the cup seals, whereby a pump chamber is provided between the cup seals. In a first embodiment, the cup seal encompassing the large diameter is the inlet valve and the cup seal encompassing the small diameter is the outlet valve, and the cup seals are arranged in an annular radial groove provided in the bore. In another embodiment, the cup seal encompassing the large diameter is the outlet valve and the cup seal encompassing the small diameter is the inlet valve. Here the cup seals are arranged in an annular radial groove provided on the piston. For noise reduction purposes, the piston is tapered from the large diameter toward the small diameter.

Claims14

Dependent claims

A radial piston pump comprising:

a pump housing with a bore;
an inlet and an outlet;
an eccentric gear for driving a piston movable in the bore;
a pump chamber having a variable volume depending on a position of the piston within the bore;
an inlet valve connecting the inlet with the pump chamber and permitting a flow of pressure medium from the inlet to the pump chamber;
and
an outlet valve connecting the pump chamber with the outlet and permitting a flow of pressure medium from the pump chamber to the outlet,
wherein the inlet valve and the outlet valve each are formed by a cup seal.

5 more elements

Dependencies are inferred from the claim text.

Radial piston pump

Life of this patent

Radial piston pump

Life of this patent

Abstract

Claims14