| 摘要 |
The invention provides a speed reducer which reduces the probability of leak of a lubricant in the speed reducer from the inside of an input shaft to a motor side. The speed reducer (10) comprises an input shaft (12). The input shaft (12) is provided with a motor shaft insertion hole (12B) at the motor side end (12A) and provided with a pinion (18) engaged with a distribution gear (16) at the end (12D) of the side opposite the motor. The speed reducer (10) comprises a bolt insertion hole (12G) penetrating from the end face (12F) of the input shaft toward the motor shaft insertion hole; the bolt insertion hole comprises a large-diameter portion (12G1) for holding the head (80A) of a connecting bolt (80) and a small-diameter portion (12G2) used for insertion of the shaft (80B) of the connecting bolt. The chamfering amount (Hch1) of a first chamfer portion (CH1) of the large-diameter portion is greater than the chamfering amount (Hch2) of a second chamfer portion (CH2) of the small-diameter portion. A sealing gasket (90) is arranged between the head of the connecting bolt and the bottom surface (12G1a) of the large-diameter portion. |
