| 摘要 |
A gear, a method and a device having a transmission gear part and a hub synchro having a spline teeth formed on an outer peripheral surface thereof and plurality of key holes formed in the opposite side of the transmission gear part, in which the hub synchro is coaxially provided with said transmission gear part, the diameter of the hub synchro is smaller than that of the transmission gear part, and the spline teeth and the plurality of key holes on the hub synchro are formed by forging.
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