Patent ID: 8327751

Claim:
A wabble plate type variable displacement compressor having a wabble plate which is connected to a piston inserted reciprocally into a cylinder bore, in which a rotational movement of a swash plate rotated together with a rotational main shaft and supported changeably in angle relative to said main shaft is converted into a wabble movement of said wabble plate, and which transmits said wabble movement to said piston to reciprocate said piston, characterized in that a rotation preventing mechanism of said wabble plate comprises (a) an inner ring provided in a housing movably in an axial direction although rotation is prevented, supporting said rotational main shaft via a bearing at an inner diameter portion to rotate relatively and to move relatively in an axial direction and having a plurality of guide grooves for guiding a plurality of balls provided for power transmission, (b) a sleeve functioning as a wabble central member of said wabble movement of said wabble plate, provided on said rotational main shaft to rotate relatively thereto and to move in an axial direction and engaged with said inner ring movably in an axial direction together with said inner ring, (c) an outer ring having a plurality of guide grooves for guiding said balls at positions opposing respective guide grooves of said inner ring, supported on said sleeve wabblingly, supporting said wabble plate fixedly on an outer circumference and supporting said swash plate rotatably via a bearing, and (d) a plurality of balls held by said guide grooves formed in said inner ring and said outer ring at a condition of opposing each other and performing power transmission by being compressed between said guide grooves.