Rotary compressor having a rolling piston with coupling groove

A rotary compressor comprising:

• a cylinder that includes a suction chamber for suctioning fluid, a compression chamber for compressing fluid, and a slide groove that extends from inside of the cylinder to outside of the cylinder;
• a drive device configured to rotate a drive shaft penetrating through the cylinder;
• a bearing coupled to the cylinder to support the drive shaft and shield the inside of the cylinder;
• a rolling piston coupled to the drive shaft inside the cylinder and configured to compress the fluid in the cylinder, wherein the rolling piston includes a coupling groove formed on an outer peripheral surface of the rolling piston;
• a vane configured to separate the suction chamber from the compression chamber, wherein the vane includes a slide part slidably inserted into the slide groove, and a coupling part that extends from the slide part and oscillatably coupled to the coupling groove;
• an oil passage provided in at least one of the coupling groove or the coupling part and configured to supply oil to the coupling groove or the coupling part, and
• wherein the bearing includes a step part provided on one surface facing the oil passage to intermittently communicate with the oil passage and configured to receive oil and to supply oil to the oil passage,
• wherein the oil passage includes a first oil groove recessed in an outer peripheral surface of the coupling part and extending from a first end to a second end corresponding to the coupling part, and
• wherein the second end of the first oil groove is provided to connect to the step part and configured to receive the oil from the step part.