| 摘要 |
A power transmission device 41, in which a spacer 69 is press-fitted around a rear side of a male thread section 63 of an input shaft 57. An adapter 83 is screwed to the male thread section 63 of the input shaft 57 and its large diameter section 89 abuts against a large diameter section 77 of the spacer 69. A hub 99 abuts against a front side of the large diameter section 89 of the adapter 83. A power interruption member 113 has a flange section 119 abutting against the hub 99, and a tubular section 117 screwed to an outer circumference of the adapter 83. It is configured so that a friction coefficient muw 1 between the large diameter section 89 of the adapter 83 and an inner circumference of the hub 99 is smaller than a friction coefficient muw 2 between the large diameter section 89 of the adapter 83 and the large diameter section 77 of the spacer 69. The adapter is re-press-fitted around the adapter so that when excessive torque occurs, power transmission can be reliably interrupted when torque reaches a predetermined level.
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