Rotary compressor and refrigeration cycle apparatus

A rotary compressor comprising:

• a cylinder having a cylindrical cylinder chamber, the cylindrical cylinder chamber being configured to compress a fluid suctioned in through a suction hole and discharge the compressed fluid through a discharge hole;
• a shaft disposed coaxially with the cylinder chamber, the shaft having an eccentric portion inside the cylinder chamber, the eccentric portion being eccentric with respect to a central axis of the cylinder chamber;
• a roller piston formed in a cylindrical shape, the roller piston being disposed coaxially with the eccentric portion, the roller piston being rotatable around the eccentric portion, the roller piston being configured to come into contact with a side surface of the cylinder chamber via an oil film;
• and
• a vane accommodated in a slit of the cylinder, the vane having a distal end on a side of the cylinder chamber, the distal end having a hingedly-coupled portion, the hingedly-coupled portion being hingedly coupled to the roller piston, the vane dividing the cylinder chamber into a suction chamber on a side of the suction hole and a compression chamber on a side of the discharge hole, wherein
• when a direction of a central axis of the roller piston is defined as a first direction, the roller piston has a groove portion formed on an outer circumference of the roller piston,
• the groove portion has a first cylindrical surface extending in the first direction,
• the vane includes
• a vane main body having a distal end on the side of the cylinder chamber, and
• a bush attached to the distal end of the vane main body, the bush being accommodated in the groove portion to constitute the hingedly-coupled portion,
• the bush has a second cylindrical surface sliding on the first cylindrical surface,
• the bush has a distance from a central axis of the second cylindrical surface, and
• the distance of the bush is less than or equal to a curvature radius of the second cylindrical surface.