Radial piston pump with piston arrangement for controlling inlet/exit flow
AssigneeZF Batavia, L.L.C.
InventorsMichael Herrmann, Wolfgang Rapp
Life of this patent
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Abstract
The radial piston pump possesses a pump housing in which a plurality of cylinder bores are provided having pump pistons placed therein which can be driven by a cam. Further, an arrangement is provided in each pump piston (3) wherein the inlet or the outlet, or both the inlet as well as the outlet of the fluid in each cylinder bore, is controlled.
Claims14
A radial piston pump comprising a pump body having a plurality of cylinder bores formed therein and a pump piston being located within each respective one of the cylinder bores, each one of the pump pistons being driven by a cam, and each of the cylinder bores communicating with a fluid inlet and a fluid outlet;
- wherein each one of the pump pistons (3) has an arrangement for controlling at least one of fluid entering the cylinder bore, through the fluid inlet, and fluid exiting the cylinder bore, through the fluid outlet;
- and
- a piston coil spring (16) is inserted, between an upper end of the pump piston (3) and a lower end of a valve plug (5) and the piston coil spring (16) is anchored to both the pump piston (3) and the valve plug (5) to minimize rotation of the pump piston (3) about a longitudinal axis thereof during operation of the radial piston pump.
A radial piston pump comprising a pump body having a plurality of cylinder bores formed therein and a pump piston being located within each respective one of the cylinder bores, each one of the pump pistons being driven by a cam, and each of the cylinder bores communicating with a fluid inlet and a fluid outlet;
- wherein each one of the pump pistons (3) has an arrangement for controlling both fluid entering the cylinder bore, through the fluid inlet, and fluid exiting the cylinder bore, through the fluid outlet;
- and
- the arrangement comprises a pair of check valves, one of the pair of check valves includes a passage (9) formed in the pump piston (3) which connects, in an open position of the one of the pair of check valves, the fluid outlet (11) with fluid located within the respective cylinder bore.
A radial piston pump comprising a pump body having a plurality of cylinder bores formed therein and a pump piston being located within each respective one of the cylinder bores, a respective valve plug (5) sealing an open end of each one of cylinder bores with a band (8) surrounding the radial piston pump and communicating with each one of the valve plugs (5), the each one of the pump pistons being driven by a cam, and each of the cylinder bores communicating with a fluid inlet and a fluid outlet;
- wherein each one of the pump pistons (3) has an arrangement for controlling both fluid entering the cylinder bore, through the fluid inlet, and fluid exiting the cylinder bore, through the fluid outlet and being exhausted around the band (8).
Dependencies are inferred from the claim text.