| 摘要 |
PROBLEM TO BE SOLVED: To improve the durability of a gear surface and a rolling surface of a bearing without requiring the mutual assembling accuracy, and to reduce the noise at the time of engagement by connecting an internal peripheral member and an external peripheral member of a sun gear to each other through a spline means so as to be integrally rotated with each other, allowing a relative displacement in the radial direction of a center shaft. SOLUTION: A first sun gear 17 is divided to an internal peripheral member 17in, which is supported by a left output shaft 5L freely to be turned through two lines of needle bearing 33, and an external peripheral member 17ex, which is formed with a gear to be engaged with a first pinion 13. A spline means 34 is interposed between both the internal peripheral member 17in and the external peripheral member 17ex so as to connect them to each other. With this structure, the internal peripheral member 17in is supported by the left output shaft 5L without generating a looseness, but the external peripheral member 17ex can be displaced in the radial direction by a looseness of the spline connection part in relation to the internal peripheral member 17in. An eccentric load to be generated when plural first pinions are engaged at the same time can be released.
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