Patent ID: 7556484

Claim:
A swing compressor comprising: a cylinder defining a cylinder chamber; a piston including a generally cylindrical-shaped roller which orbitally revolves along an inner surface of the cylinder chamber and a blade integrally formed with the roller that is swingably held by the cylinder, the roller having an inner circumferential sliding surface with a large-width portion configured to receive a heavy load and a small-width portion that is smaller in width than the large-width portion and is configured to receive a light load; and a drive shaft having an eccentric portion that is slidably fitted to the inner circumferential sliding surface of the roller, the piston dividing a space inside of the cylinder into a suction chamber and a compression chamber and performing a swing motion by rotation of the drive shaft, the cylinder having a reference line contained in a longitudinally extending center plane of the blade and lying on the inner circumferential sliding surface of the roller, the small-width portion being disposed only in a range extending between a point located 30° from the reference line and a point located 180° from the reference line in a rotational direction of the drive shaft in the inner circumferential sliding surface, and the small-width portion being provided on one side with respect to the longitudinally extending center plane of the blade, with the cylinder including a suction port that communicates with the suction chamber along the one side.