| 摘要 |
A lock pin is slidably provid d in a radial dir ction of an apparatus side, within a lock pin receiving hole in a first rotor. Within a slider receiving hole in a rotor as a second rotor is provided a slider (closing member) slidable in an axial direction of the slider receiving hole, and a bush is press-fitted into a position in the proximity of the outer peripheral surface of the rotor, in the slider receiving hole. On the bush is formed an engaging hole passing through the bush along its axial direction and engaging therein the lock pin. The slider slides by hydraulic pressure to push the lock pin engaged with the engaging hole out of the hole, and close the engaging hole.
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