| 摘要 |
PURPOSE:To eliminate backlash in the rotating direction between a sun gear drum and a sun gear by disposing an urging member between the sun gear drum and the sun gear, thereby restraining the relative motion between the sun gear drum and the sun gear while power transmission is not performed therebetween. CONSTITUTION:In a planetary gear type speed change gear, a coned disc spring 30 is interposed as an urging member through a snap rig 28 between a sun gear drum 6 and the tooth portion 7a of a sun gear 7. The coned disc spring 30 has strong force of urging in direction of an arrow B, so that the sun gear drum 6 and the sun gear 7 are united in a body. Thus, while power is not transmitted between the sun gear drum 6 and the sun gear 7, even if external vibration is applied thereto, the sun gear drum and the sun gear are kept from rocking in the rotating direction to prevent backlash of both spline portions thereof.
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