| 摘要 |
PURPOSE: A lubrication system is provided to sufficiently lubricate a gap formed between the main shaft bearing and thrust washer. CONSTITUTION: A compressor has a structure where a rotor fixed to a rotation axis of the compressor and which rotates together with the rotation axis, is supported to be freely rotatable with respect to a main shaft bearing(1), with a thrust washer interposed between the rotor and the main shaft bearing, and a reciprocating piston of the compressor is connected to an end of the rotation axis through a crank. The main shaft bearing has a front end surface(2) with a plurality of lubrication grooves(3). The lubrication groove has an inlet point(3a) and an outlet point each of which is disposed at the position different from each other by a predetermined angle, centering from the rotation center point(O) of the main shaft bearing. The line connecting the inlet point and the outlet point of the lubrication groove is a curved line or a half-bent straight line. The lubrication groove has an inlet surface and an outlet surface which are formed in such a manner that the cross sectional area of the outlet surface is narrower than that of the inlet surface.
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