| 摘要 |
PURPOSE:To facilitate gear cutting by use of a hobby disposing a sun gear on an input shaft to rotate in a body, and solidly forming teeth of the sun gear on the input shaft without any interruption. CONSTITUTION:A sun gear 30 is disposed on an input shaft 25 in such a manner as to rotate in a body, and a pinion carrier 34 is connected to a primary pulley 6, whereby the advance state is obtained by connecting the pinion carrier 34 to an input shaft 25, and the backward state is obtained by fixing an internal gear 31 by a backward brake 42. Thus, the sun gear 30 is disposed on the input shaft 25, so that even if the sun gear 30 is solidly formed on the input shaft, the teeth of the gear 30 can be easily cut by a hob without interruption by the primary pulley 6.
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