Compressor

A compressor, comprising:

• a casing;
• a crank shaft configured to transmit a rotational force of a motor drive provided within the casing to a rolling piston;
• a plurality of bearing plates configured to support the crank shaft;
• a cylinder fixed and coupled between the plurality of bearing plates to form a compression space;
• and
• the rolling piston, which is eccentrically coupled to the crank shaft to divide the compression space into an outer compression space and an inner compression space while making a turning movement with respect to the cylinder, wherein the cylinder includes:
• an outer cylinder portion;
• an inner cylinder portion separated from an inner side of the outer cylinder portion by a predetermined distance to form the compression space;
• and
• a vane portion that connects an inner circumferential surface of the outer cylinder portion and an outer circumferential surface of the inner cylinder portion, to which the rolling piston is slidably inserted and coupled, wherein the vane portion is formed with an outer connecting end connected to the inner circumferential surface of the outer cylinder portion and an inner connecting end connected to the outer circumferential surface of the inner cylinder portion and wherein a stepped portion is formed between an upper surface of the outer connecting end and an upper surface of the inner connecting end,
• wherein the rolling piston is formed with a bush groove into which the vane portion of the cylinder is slidably inserted, wherein a rolling bush that guides the turning movement of the rolling piston is rotatably coupled to the bush groove, and wherein an inner diameter of the bush groove is formed to be equal to or greater than a length from the outer connecting end of the vane portion to the stepped portion.