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US 3,935,794 AGranted
Radial piston pump/motors
OwnerRollin Douglas Rumseyinventor
Life of this patent
Estimating the term…
Abstract
Radial piston pump or motor has within its housing a stationary pintle valve, an external shaft connected to a rotating spider of which are mounted pressure balanced pivotal cylinders. Rigid piston - shoe assemblies engage the cylinders and ride on a cylindrical raceway the eccentricity of which is adjustable for stroke. Balanced annular sealing is provided between the pivotal cylinders and arcuately surfaced pockets therefor in the rotating spider/rotor.
Claims13
In a radial piston pump/motor structure including a housing providing a chamber with a shaft extending therefrom in relative rotary relation:
- valve means carried by the housing within said chamber;
- a rotor journaled within said chamber and operationally attached to the shaft;
- arcuately surfaced pockets in the outer perimeter of said rotor;
- cylinder members in said pockets having bearing surfaces complementary to and riding in angularly slideable relation on the pocket surfaces;
- means secured to the rotor maintaining the cylinder members in the pockets;
- each of said cylinder members having a radially outwardly opening cylinder bore within which is radially reciprocably mounted a piston projecting radially outwardly and having on its radially outer end a shoe riding a surface within said enclosure facing toward said rotor;
- means for effecting fluid communication between radially inner ends of said cylinder bores and said valve means and thereby with the radially inner ends of said pistons, and including respective ports at the radially inner ends of said cylinder members concentrically aligned with said cylinder bores and extending to and aligned with respective ports in said rotor and which rotor ports are of substantially smaller diameter than said cylinder bores and communicate with said valve means;
- each of said cylinder members having an annular constriction providing the respective port at its radially inner end, said constriction providing seal retaining means;
- and
- annular sealing means retained by said seal retaining means in assembly with said cylinder members in surrounding relation to said cylinder member ports and:
- said sealing means being in fluid sealing engagement with the surface areas of said pockets surrounding said rotor ports;
- said sealing means being of substantially the same diameter as the diameter of said cylinder bores and maintaining a balanced sealing relationship between the cylinder members and said surface areas in all relative angular positions of the cylinder members and said surface areas.
9 more elements
In a radial piston pump/motor structure including a housing providing a chamber with a shaft extending therefrom in relative rotary relation:
- a pintle valve member concentrically aligned with said shaft in fixed relation to the housing within said chamber;
- a rotor within said chamber corotatively attached to the shaft and journaled on said pintle valve member in concentric relative rotary relation;
- hemispherical pockets is the outer perimeter of said rotor;
- spherical cylinder member complementary to and riding swivelly slideably in said pockets and retained therein by means secured to the rotor;
- each of said cylinder members having a radially outwardly opening cylinder bore within which is radially reciprocably mounted a piston projecting radially outwardly and having on its radially outer end a shoe riding a cylindrical raceway within said enclosure, the raceway having means for controlling it between concentric and eccentric positions relative to said rotor;
- means for effecting fluid communication between radially inner ends of said cylinder bores and said pintle valve member and thereby with the radially inner ends of said pistons, and including respective ports at the radially inner ends of said cylinder members conecntrically aligned with said cylinder bores and extending to and aligned with respective ports in said rotor, and which rotor ports are of substantially smaller diameter than said cylinder bores and communicate with said pintle valve member;
- each of said cylinder members having an annular constriction providing the respective port at its radially inner end, said constriction providing seal retaining means;
- annular sealing means retained by said seal retaining means in assembly with said cylinder members and surrounding said cylinder member ports, said sealing means being in fluid sealing engagement with annular surface areas of said pockets surrounding said rotor ports;
- and
- said sealing means being substantially equal in diameter to said cylinder bores and maintaining with said pockets a balanced sealing relationship between the cylinder members and the rotor.
7 more elements
Dependencies are inferred from the claim text.