Patent ID: 6884051

Claim:
A rotary fluid machine comprising: a casing having a rotor chamber, a rotor accommodated in said rotor chamber, and a plurality of vane piston units disposed in said rotor radially about a rotational axis of said rotor for reciprocal movement in a radial direction, each of said vane piston units comprising a vane slidable in said rotor chamber and a piston abutting against a non-sliding portion of said vane, wherein said piston is operated by the expansion of a high-pressure gas-phase operating medium to rotate said rotor through a power-converting device and to rotate said rotor through said vanes by the expansion of a low-pressure gas-phase operating medium resulting from the drop in pressure of said high-pressure gas-phase operating medium, wherein a pressurized liquid-phase fluid is supplied to a static-pressure bearing on an output shaft rotated in unison with said rotor to support said output shaft in a static-pressure manner, and a portion of said pressurized liquid-phase fluid is supplied to another static-pressure bearing located at a radially outer portion of said rotor through passages defined in said rotor.