Patent ID: 9297372
Filing Date: 2016-03-29
CPC Classification: F04B,Y10S

Claim Text:
1. A compressor comprising: a hermetic case to retain oil in a lower portion thereof; a frame accommodated in the hermetic case; a compression mechanism provided with a cylinder fixed to the frame, and a piston to reciprocate to compress a refrigerant in the cylinder; a power transmission mechanism provided with a stator fixed to the frame and a rotor adapted to rotate inside the stator; a rotating shaft coupled to the rotor to rotate together with the rotor and provided with an eccentric part to convert rotational motion of the rotor into translational motion of the piston and a hollow portion to raise the oil retained in the hermetic case; a fixation shaft inserted into the hollow portion of the rotating shaft, fixed to one of the stator and the frame; and a raising member to raise the oil retained in the hermetic case in cooperation with an inner circumferential surface of the rotating shaft when the rotating shaft rotates, wherein a spiral groove is formed on an outer circumferential surface of the rotating shaft and extends to a bottom of the rotating shaft so that the raised oil enters the spiral groove at an upper portion of the rotating shaft and lubricates contact surfaces of the rotating shaft while descending through the spiral groove.