| 摘要 |
PURPOSE:To prevent trouble such as burning by arranging a ring spacer having inner hole smaller than the inner diameter of the outer race of a small diameter bearing at large diameter bearing side in bearing section and forming an oil sump therein. CONSTITUTION:Oil to be led in an oil sump 22 lubricates a small diameter bearing 6 reliably then flows over a spacer 21 and lubricates a large diameter bearing 5. Practically, oil being brought up through engagement of both high void gears 9, 13 is led into the oil sump. The small diameter bearing 6 partially immersed in the oil sump 22 is sufficiently lubricated with oil. Oil flowed over the spacer 21 is returned through a large diameter bearing 5 to gearing section 9, 13, and the large diameter bearing 5 is lubricated by the oil flow.
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