| 摘要 |
PROBLEM TO BE SOLVED: To provide a reduction gear ensuring stable operability and easy assembling performance by positively and easily ensuring the concentricity of fixed sun internal gears and a movable sun-internal gear, when operating the reduction gear or assembling it. SOLUTION: This wondrous planetary reduction gear is provided with an input shaft 2, planetary gears 6, 6, a pair of fixed sun internal gears 7, 8 and the movable sun internal gear 9. The fixed sun internal gears 7, 8 are arranged being spaced in the axis direction of the input shaft 2, and the movable sun internal gear 9 is interposed between them. Outer insert parts 9b, 9c formed at both end parts of the movable sun internal gear 9 are inserted externally in sliding contact with the end parts of the fixed sun internal gears 7, 8. The movable sun internal gear 9 and fixed sun internal gears 7, 8 are thereby regulated concentrically.
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