Radial piston pump/motors
OwnerRollin Douglas Rumseyinventor
Life of this patent
Estimating the term…
Abstract
In a pump or motor assembly having telescoped slidably relatively rotative surfaces whereby one of the members supports the other member for relative rotation and one of the members has passage means for hydraulic pressure fluid. Hydraulic bearing means between the surfaces in communication with the pressure fluid passage have distribution of hydraulic pressure fluid to the bearing means controlled by valve means to improve efficiency of the hydraulic bearing means to counteract off-center forces. In a preferred arrangement the bearing means comprise circumferentially spaced pockets in one of the relatively rotative surfaces, and the valve means control distribution of hydraulic pressure fluid to the pockets by modulating lowered pressure in any of the pockets.
Claims15
In a pump or motor assembly including a housing providing a chamber having therein hydraulically driven and driving members provided with telescoped slidably relatively rotative surfaces whereby one of the members supports the other member for relative running rotation, the members being liable to be affected by off-center forces tending to shift the members eccentrically during running rotation, and one of said members having passage means for hydraulic pressure fluid during said running rotation:
- hydraulic bearing means between said surfaces at substantially opposite sides of the axis of rotation of said surfaces;
- means effecting hydraulic pressure fluid communication between said passage means and said bearing means;
- and
- valve means for controlling distribution of hydraulic pressure fluid from said passage means through said communication means to said bearing means to counteract the off-center forces which act to relatively shift said members eccentrically and thereby restrict the bearing means at one side of said axis relative to the bearing means at the other side of said axis;
- said valve means operating to increase the flow of hydraulic pressure fluid to the bearing means at the restricted side and to substantially proportionately decrease the flow of hydraulic pressure fluid to the bearing means at said other side, whereby to maintain substantially concentric running rotation of the members.
Dependencies are inferred from the claim text.