| 摘要 |
PURPOSE:To prevent friction and seizure of each bearing portion, by providing axial oil supplying grooves at an eccentric shaft portion opposite to a plain bearing of a rotary scroll member and on a wall of a shaft support portion for a main shaft, and reducing passage resistance of the oil supplying grooves with increase in height of position of the bearing portions. CONSTITUTION:Axial oil supplying grooves 70, 71 and 72 are formed at an eccentric shaft portion 53 opposite to a plain bearing of a rotary scroll member 2, and at a shaft support portion 52 of a main shaft. The oil supplying grooves 70, 71 and 72 are communicated through lateral oil supplying grooves 61, 62 and 63 with an oil supplying hole 60 opened through a shaft 50. Passage resistance of the axial oil supplying grooves 70, 71 and 72 and the lateral oil supplying grooves 61, 62 and 63 is reduced with increase in height of position of the bearing portions. With this arrangement, there may be created in the bearing an oil film repulsive force corresponding to load of fluidic pressure acting in a radial direction of the main shaft 50, and also an amount of oil to be supplied may be suitably distributed, thus preventing abrasion and seizure of the bearing. |
