| 摘要 |
A driving device(2) and a compressing portion (3) are establishd in a case(1). The compressing portion is composed of a crank shaft, which is driven by a cylinder(6) and a driving device, a roller(7), a vane(8), a main bearing(5) and a sub-bearing (20). The vane reciprocates the oil surface(5). The edge portion of the main bearing and the sub-bearing are submerged in the oil. A closed space(24), which is filled with oil, is made behind the vane. A rib, which is attached on the circumference of the subbearing shut the space. An extrusion cover(22) is assembled with the bolt hole of the rib and the oil supply hole of the shaft(4). The noise of the high pressure gas made by the roller rotation is reduced in the muffler(16).
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