Patent ID: 7225724

Claim:
A hermetic compressor comprising a frame having a hollow portion, a crankshaft rotatably inserted in the hollow portion, and a thrust portion formed at the frame to support the crankshaft, further comprising: an impurities discharge passage formed at an outer circumferential surface of the crankshaft adjacent to the thrust portion of the frame and adapted to guide oil and impurities mixed with the oil out of the crankshaft; and a plurality of discharge guiding grooves formed at the thrust portion of the frame at specific positions corresponding to the impurities discharge passage, and adapted to guide the oil and the impurities, having passed through the impurities discharge passage, out of the thrust portions, wherein: the crankshaft includes a plurality of oil holes for the entrance and exit of the oil into or from the crankshaft, and an external passage to connect the oil holes to one another; and the impurities discharge passage is separately formed with the external passage and extends along the outer circumferential surface of the crankshaft starting from one of the plurality of oil holes to an end of the crankshaft.