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A split-discharge balanced dual-lobe 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

A split-discharge balanced dual-lobe 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 vane. Opposed symmetrical 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. The fluid inlet and outlet passages include a fluid inlet port opening into each cavity adjacent to one circumferential edge thereof, a first fluid outlet port opening into each cavity adjacent to the opposing circumferential edge thereof, and a second fluid outlet port opening into each cavity at a position circumferentially between the inlet and first outlet ports.

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A rotary hydraulic machine that comprises: a housing, a rotor mounted for rotation within said housing and having a plurality of radially extending peripheral slots, a plurality of vanes individually slidably mounted in said slots, means forming a cam ring within said housing surrounding said rotor

A rotary hydraulic machine that comprises: a housing, a rotor mounted for rotation within said housing and having a plurality of radially extending peripheral slots, a plurality of vanes individually slidably mounted in said slots, means forming a cam ring within said housing surrounding said rotor and having a radially inwardly directed surface forming a vane track and at least one fluid pressure cavity between said surface and said rotor, and fluid inlet and outlet means in said housing coupled to said cavity; characterized in that said fluid inlet and outlet means comprises: means for receiving hydraulic fluid and directing such fluid to said cavity through a cavity inlet port adjacent to one circumferential edge of said cavity, means including a first cavity outlet port adjacent to an opposing circumferential edge of said cavity for directing fluid from said cavity along a first outlet path, means including a second cavity outlet port positioned circumferentially of said rotor between said inlet port and said first outlet port for directing fluid from said cavity along a second flow path different from said first flow path and at flow characteristic different from that in said first flow path, and means for selectively directing fluid at outlet pressure from at least one of said first and second outlet ports to said inlet port.