Patent ID: 7878778

Claim:
A rotary compressor comprising: an eccentric-rotation type piston mechanism including a cylinder with a ring-shaped cylinder chamber, a ring-shaped piston eccentricly disposed in the cylinder chamber to divide the cylinder chamber into an outer cylinder chamber and an inner cylinder chamber, and a blade arranged in the cylinder chamber to divide each of the outer and the inner cylinder chambers into a high pressure chamber and a low pressure chamber, the cylinder and the ring-shaped piston being movable eccentrically relative to each other with one of the cylinder and the ring-shaped piston serving as a movable side and the other one of the cylinder and ring-shaped piston serving as a fixed side; a drive shaft coupled to the one of the cylinder and the ring-shaped piston serving as the movable side with the movable side being moved in response to rotation of the drive shaft about a rotation axis, the drive shaft including an eccentric part arranged and configured to engage with the one of the cylinder and the ring-shaped piston serving as the movable side; and a drive mechanism coupled to the drive shaft to rotate the drive shaft in response to operation of the drive mechanism, the one of the cylinder and the ring-shaped piston serving as the fixed side including a main bearing which supports the drive shaft in a rotatable manner on a drive mechanism side in the eccentric-rotation type piston mechanism, the main bearing being integrally formed as a unitary part of the one of the cylinder and the ring-shaped piston serving as the fixed side, and the outer cylinder chamber, the inner cylinder chamber and the eccentric part being formed on a common plane perpendicular to the rotation axis.