Patent ID: 11879459
Assignee: FUJITSU GENERAL LIMITED
Field: nan (nan)
Classification: CPC nan | IPC F

Claim 0:
1. A rotary compressor comprising:
a compressor housing that is provided with a refrigerant discharge portion and a refrigerant suction portion;
a compression unit that is arranged in the compressor housing and configured to compress a refrigerant, which is sucked from the suction portion, and discharge the refrigerant from the discharge portion; and
a motor that is arranged in the compressor housing and configured to drive the compression unit, wherein
the compression unit includes an annular cylinder; an upper end plate that closes an upper side of the cylinder; a lower end plate that closes a lower side of the cylinder; a rotating shaft that is rotated by the motor; a piston that is fitted to the rotating shaft and is configured to revolve along an inner peripheral surface of the cylinder and form a cylinder chamber in the cylinder; and a vane that projects from a vane groove provided on the cylinder into the cylinder chamber and brought into contact with the piston so as to section the cylinder chamber into a suction chamber and a compression chamber,
at least one end face of both end faces of the piston in an axial direction of the rotating shaft has formed therein an oil-film retention region having an array of a plurality of recessed portions that are configured to retain lubricating oil, and
each of the plurality of recessed portions is not connected to an inner peripheral surface and an outer peripheral surface of the piston and formed in a linear shape having a bend portion, and arranged in a radial direction of the piston with a projecting end of the bend portion oriented in a circumferential direction of the piston.