| 摘要 |
PURPOSE:To prevent seizure and damage of a bearing due to insufficient lubrication by forming a lubricating oil supply hole on a bearing boss of a gear by notching to supply the satisfactory quantity of lubricating oil. CONSTITUTION:Oil scattered in the interior of a case by rotation of a gear adheres to tooth surfaces and end surface of a speed change gear 3 to drop in the shaft portion side. As a lubricating hole 15 of a satisfactory size is formed on a bearing boss 6 by interposing a spacer member 12, oil which flows along the end surface of the speed change gear 3 and drops in the shaft portion side is collected at an opening portion of the lubricating hole 15. Accordingly, the satisfactory quantity of lubricating oil can be supplied to a needle bearing 2 disposed between a driving shaft 1 and the speed change gear 3 to prevent seizure and damage of the bearing due to shortage of lubricating oil.
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