Wobble plate type variable displacement compressor

A wobble plate type variable displacement compressor having pistons inserted reciprocally into cylinder bores, a swash plate rotated together with a rotational main shaft and supported changeably in angle relative to said main shaft, a wobble plate which is connected to said pistons, in which a rotational movement of said swash plate is converted into a wobble movement of said wobble plate, and which transmits said wobble movement to said pistons to reciprocate said pistons, and a wobble plate rotation preventing mechanism configured to prevent rotation of said wobble plate, wherein:

• said wobble plate rotation preventing mechanism comprises (a) an inner ring provided in a housing movably in an axial direction while being prevented from rotating via an inner ring rotation preventing mechanism, the inner ring supporting said rotational main shaft at an inner diameter portion of the inner ring 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 wobble central member of said wobble movement of said wobble 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 wobblingly, and connected with said wobble plate on an outer circumference side of said outer ring, and (d) a plurality of balls held by said guide grooves formed in said inner ring and said guide grooves formed in said outer ring at a condition of opposing each other and performing power transmission by being compressed between said guide grooves,
• said inner ring rotation preventing mechanism formed in said housing is constructed as a contoured interlock mechanism formed between an outer circumference of said inner ring and an inner circumference of said housing, and
• a swash plate minimum inclination angle setting mechanism, comprising:
• (i) at least one groove on a circumference of said inner ring, said groove extending parallel to a rotational axis and having an end wall extending perpendicular to said rotational axis, and (ii) a pin extending parallel to said rotational axis and mounted on said housing, such that an angle of inclination of the swash plate is at its minimum when an end of the pin abuts said end wall.