Rotary compressor with vane support portion to suppress or prevent axial vane tilting

A rotary compressor, comprising:

• a casing;
• a cylinder fixed inside of the casing to define a compression space;
• a main bearing and a sub bearing respectively disposed on both sides of the cylinder in an axial direction;
• a rotational shaft supported on the main bearing and the sub bearing;
• a roller disposed on the rotational shaft, and forming at least one contact point at which an outer circumferential surface thereof is in contact with an inner circumferential surface of the cylinder;
• and
• at least one vane slidably inserted into the roller to divide the compression space into a plurality of compression chambers when the roller is rotated within the cylinder, wherein at least one back pressure pocket having a predetermined depth is formed in a bearing surface, facing the roller, of at least one of the main bearing or the sub bearing, wherein a vane support portion is formed on the bearing surface to support the at least one vane in the axial direction, wherein the vane support portion extends from an inner circumferential surface of the at least one back pressure pocket at a side adjacent to the contact point along a reciprocating direction of the at least one vane, wherein the at least one back pressure pocket includes an inner wall surface, an outer wall surface, and a first side wall surface and a second side wall surface that connect ends of the inner wall surface and the outer wall surface, wherein the vane support portion is formed as the second side wall surface and the outer wall surface adjacent to the contact point extends toward the inner wall surface, wherein an inner circumferential surface of the vane support portion is formed in an area where the second side wall surface and the outer wall surface meet, and wherein a gap between the inner circumferential surface of the vane support portion and the inner wall surface is gradually decreased in a direction toward the contact point.