| 摘要 |
PURPOSE:To improve a bearing life, vibration and noise by supplying lubricating oil through an annular groove from a thin hole, so as to form an oil film layer between the internal peripheral surface of an annular member and the outer ring peripheral surface of a rolling bearing, at the time of rotating a rotary unit at a high speed. CONSTITUTION:When a shaft 23 is rotated at a high speed, lubricating oil is supplied to a part of a rolling bearing 24 by jetting the lubricating oil from a jet nozzle 28a, and on the other hand, the lubricating oil is supplied, through a fine hole 26a, between an annular member internal peripheral surface 26a and a damper 25 peripheral surface and between an outer ring 24b peripheral surface and a damper 25 internal peripheral surface, so that squeeze oil film layers 30, 31 are formed. Accordingly, a lubricating oil amount supplied to the squeeze oil film layers 30, 31 is limited by the fine hole 26a, and since the lubricating oil amount of quick flow speed can be sufficiently supplied to a part of the rolling bearing 24, a bearing life can be substantially improved, so that miniaturizing an oil pump and lightening the weight can be attained. |
