Rotary compressor with an oil groove facing the vane and exposed to a gap between the vane and the piston

A rotary compressor comprising a motor arranged in a sealed container and a compression unit arranged in the sealed container and driven by the motor, the compression unit including:

• an annular cylinder configured to include a vane groove opening on an inner peripheral surface of the cylinder and communicating with an inside of the sealed container on an outer peripheral surface side of the cylinder;
• an end plate configured to close an end face-side opening of the cylinder;
• an annular piston fitted to an eccentric portion of a rotating shaft rotationally driven by the motor, the annular piston revolving in the cylinder along the inner peripheral surface of the cylinder to form a working chamber with the inner peripheral surface of the cylinder;
• a vane configured to protrude into the working chamber from an inside of the vane groove and abut on an outer peripheral surface of the annular piston at a leading end surface of the vane to divide the working chamber into a suction chamber and a compression chamber;
• a discharge port provided on the end plate on the compression chamber side;
• and
• a suction port opening on the inner peripheral surface of the cylinder on the suction chamber side, wherein
• an oil groove is formed at a position facing an end face of the vane on the end plate, one end side of the oil groove communicating with the inside of the sealed container, and an other end side of the oil groove being exposed in a gap between the leading end surface of the vane and the outer peripheral surface of the annular piston formed when the leading end surface of the vane is in abutment on the outer peripheral surface of the annular piston, and
• the gap in which the oil groove is exposed is on the compression chamber side of the working chamber.