VARIABLE DISPLACEMENT FLUID COMPRESSOR

PROBLEM TO BE SOLVED: To provide a variable displacement fluid compressor whose discharge capacity is variable, in which lowering of efficiency is prevented, excellent durability is implemented, and torque fluctuations are not susceptible to occurrence. SOLUTION: The variable displacement fluid compressor comprises: a rotor 5, whose circumferential wall 501 is an involute curve, and which moves around a rotating shaft 1; rotation prevention means 8, 9, 502 allowing change in revolution radius rk of the rotor 5 at a time of revolution and preventing rotations of the rotor; a stator 6 which houses the rotor 5 therein, and whose inner circumferential wall 601 is an involute curve drawn based on a base circle same in diameter as the outer circumferential wall 501; a partitioning means 7 partitioning a space formed between the rotor 5 and the stator 6; a revolution radius variable means 101, 301 which can change the revolution radius rk of the rotor 5; a pressing means 4 pressing the rotor 5 to make the rotor 5 is brought into contact with the stator 6; a relative position variable means 8, 10, 30 which can change a circumferential relative position of a rotor 5 and the stator 6. COPYRIGHT: (C)2004,JPO