Displacement control valving for a radial piston device

Details Displacement control valving for a radial piston device Displacement control valving for a radial piston device

1979-07-16

1980-12-09

Freeh, William L.

Motors: expansible chamber type

Three or more cylinders arranged in parallel radial or...

Motive fluid supply or discharge through piston

91497, 417217, F01B 1306, F04B 104

Patent

active

042377749

ABSTRACT:
A radial piston device such as a radial piston motor (10) has a rotor assembly (34) rotatably positioned within a cylindrical race (43) which is movable to a first displacement position by a first piston (52) and a second displacement position by a second piston (53). A pintle (26) extends into a bore (36) of a rotor (33) of the rotor assembly (34) and has first and second ports (27,28) for delivering fluid to and from the rotor (33). In order to reduce the size of the radial piston device and to minimize the number of external lines, a control valve (66) is positioned within a bore (59) of the pintle (26) and selectively controls fluid flow from one of the first and second ports (27,28) to the first and second pistons (52,53) for shifting the cylindrical race (43) between the first and second positions.

REFERENCES:
patent: 2006880 (1935-07-01), Benedek
patent: 2429368 (1947-10-01), Quiroz
patent: 3274946 (1966-09-01), Simmons
patent: 3530768 (1970-09-01), Engel
patent: 3744379 (1973-07-01), Freeman
patent: 3828400 (1974-08-01), Mason et al.
patent: 3899957 (1975-08-01), Carlson et al.
patent: 4195553 (1980-04-01), Alie

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