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A vane-type rotary hydraulic machine that comprises a housing, a rotor mounted within the housing and having a plurality of radially extending peripheral slots, and a plurality of vanes individually slidably mounted in the rotor slots. A cam ring within the housing surrounds the rotor and has a radi

A vane-type rotary hydraulic machine that comprises a housing, a rotor mounted within the housing and having a plurality of radially extending peripheral slots, and a plurality of vanes individually slidably mounted in the rotor slots. A cam ring within the housing surrounds the rotor and has a radially inwardly directed surface forming a track for sliding engagement with the vanes. Symmetrical diametrically opposed fluid pressure cavities are formed between the cam ring surface and the rotor, and fluid inlet and outlet passages in the housing are coupled to the fluid pressure cavities. Both of the fluid inlet and outlet passages comprise housing fluid passages that open to side faces of the rotor radially inwardly of the fluid pressure cavities, and fluid passages extending radially through the rotor between outer ends opening at the periphery of the rotor between adjacent slots and an inner end opening axially at the side faces of the rotor for communication with the housing fluid passage as a function of rotation of the rotor.

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A balanced dual-lobe rotary hydraulic machine that comprises: a housing including a pair of plates mounted against rotation within said housing and having opposed flat parallel faces forming a rotor cavity; a rotor mounted for rotation about a fixed axis within said cavity and having flat parallel s

A balanced dual-lobe rotary hydraulic machine that comprises: a housing including a pair of plates mounted against rotation within said housing and having opposed flat parallel faces forming a rotor cavity; a rotor mounted for rotation about a fixed axis within said cavity and having flat parallel side faces opposed to said plate faces, a plurality of radially extending peripheral slots, a plurality of vanes individually slidably mounted in said slots, and a plurality of passages extending radially through said rotor between said slots, each of said passages having an outer end opening at the periphery of said rotor between an adjacent pair of said slots and a pair of inner ends opening at respective ones of said rotor side faces, said open inner ends being at uniform identical radius from said axis on said side faces, a cam ring mounted against rotation within said housing radially surrounding said rotor and having a radially inwardly directed surface forming a vane track and a pair of symmetrical diametrically opposed fluid pressure cavities between said surface and said rotor, a fluid inlet including a pair of inlet passages in said housing extending through each of said plates and forming identical diametrically opposed kidney-shaped openings in each of said plate faces, said inlet openings in each of said plate faces being identical and opposed to the inlet openings in the opposing plate face and at uniform radius from said axis equal to said radius of said open inner passage ends so as to be positioned to register with said inner passage ends in said rotor side faces, and a fluid outlet including a pair of outlet passages in said housing extending through each of said plates and forming identical diametrically opposed kidney-shaped openings in each of said plate faces, said outlet openings in each of said plate faces being identical and opposed to outlet openings in the opposing plate face and at uniform radius from said axis equal to said radius of said open inner passages ends so as to be positioned to register with said inner passage ends in said rotor side faces.