| 摘要 |
PURPOSE:To prevent burn-out at bearing portions due to uneven contact of bearing metals disposed at the top of a crank shaft, by locating the upper end faces of two bearing metals on the same plane, and making the points where the reaction forces of the load applied to the two bearing metals are acted near to each other. CONSTITUTION:A bearing metal 36 is fitted in an eccentric hole 42 formed in a crank shaft 6 where a shaft 55 of an oscillating scroll 2 is fitted. The bearing metal 36 is disposed such that its upper end face is located on the same plate as the upper end face of a bearing metal 37 and a large-diameter shaft portion of the crank shaft 6. Further, the bearing metal 36 is formed with an oil groove for feeding lubricating oil, and the oil groove is formed at the portion of the bearing metal 36 located on the opposite side of the portion where load is applied. The large-diameter shaft portion of the crank shaft 6 is fitted at the portion of the bearing metal 37 of a bearing support 7 and a stepped portion of the crank shaft 6 is supported by a thrust support 38 of the bearing support 7. Therefore, it is enabled to prevent occurrence of burn-out at the bearing portions. |
