| 摘要 |
PURPOSE:To make it possible to stably feed oil, by forming an axial oil feed groove in the outer surface of a crank section at a position which is advanced by a specified angle in the rotating direction from a position at which a load radially of a shaft acts due to centrifugal force. CONSTITUTION:Centrifugal force F which is generated at the center S1 of a crank section 8b in association with the rotation of a crank shaft 9 by an inverter-control motor, is made to act upon a slide bearing 8 so that an eccentricity is effected from the center B1, and therefore, a minimum gap Za1 and a maximum gap Za2 are formed. However, since an oil feed groove in the outer surface of the crank section 9b is formed at a position which is advanced in the rotating direction by an angle of 45 deg., fed oil is driven into the minimum gap Za1 to effect wedge action which cause oil film pressure to rise up through the maximum gap Za2 so that the pressure becomes maximum at the minimum gap Za1 position. Thus, the opposed oil film reacting force is effected in the bearing thereby it is possible to prevent the bearing from being worn and seizing. |
