Patent ID: 8740585

Claim:
A hermetic compressor, comprising: a hermetic container filled with oil in a base thereof; a rotatable crank shaft having a screw-shaped oil groove in an outer portion thereof; an oil feeder having an upper portion in which a lower portion of the crank shaft is inserted, and a lower portion immersed in the oil in the hermetic container: a frame through which the crank shaft passes to be rotatably coupled thereto; a motor provided on a circumference of the crank shaft, that rotates the crank shaft, the motor including: a stator supported on the frame; and a rotor provided at a lower side of the frame, fixedly coupled with the crank shaft, and rotated by electromagnetic interaction with the stator; a bushing having an upper portion coupled between the frame and the crank shaft, and a lower portion coupled between the rotor and the crank shaft, wherein the crank shaft is rotated by the motor to pump oil along the oil groove, wherein no gap is provided between a lower surface of the bushing and the rotor, wherein a height gap is provided between an upper surface of the bushing and the frame, and wherein a radial gap is provided between a circumferential surface of the bushing and the frame.