Patent ID: 7040872

Claim:
A rotary fluid machine including: a rotor chamber ( 14 ); a rotor ( 31 ) rotatably accommodated in said rotor chamber ( 14 ); operating members ( 41 , 42 ) radially movably supported in said rotor ( 31 ) and spaced from each other at a constant angle in a circumferential direction; operating chambers ( 39 , 54 ) whose volumes are varied due to the movement of said operating members ( 41 , 42 ) with the rotation of said rotor ( 31 ); so that a pressure energy of a gas-phase working medium supplied to and discharged from said operating chambers ( 39 , 54 ) in response to the rotation of said rotor ( 31 ) and a rotational energy of said rotor ( 31 ) are converted from one into another, wherein the radial movements of said operating members ( 41 , 42 ) are substantially stopped, so that the volumes of said operating chambers ( 39 , 54 ) assume substantially constant values, for a period that includes: a first period from an end of an exhaust stroke at which the gas-phase working medium is discharged from said operating chambers ( 39 , 54 ) to a start of an intake stroke at which the gas-phase working medium is supplied to said operating chambers ( 39 , 54 ), said first period corresponding to said constant angle between said operating members; a second period extending from a point preceding from the end of said exhaust stroke by one predetermined angle to said end of the exhaust stroke; and a third period extending from said start of the intake stroke to a point following said start of the intake stroke by another predetermined angle.