| 摘要 |
To provide a gear structure easy to be attached and detached and a timepiece having the same. A gear structure includes a support shaft having a fitted shaft portion and a gear main body having fitting portions elastically fitted to the fitted shaft portion. The fitting portion of the gear main body and the fitted shaft portion of the support shaft are constituted such that the fitting portion of the gear main body is fitted to the fitted shaft portion of the support shaft in a state of prohibiting rotation of the gear main body relative to the support shaft. The fitting portion of the gear main body is constituted to be attachable and detachable to and from the fitted portion of the support shaft by being elastically deformed in D 1 , E 1 and D 2 , E 2 directions. The fitted shaft portion is provided with a noncircular sectional shape shifted from a circle centering on a rotation center axis line of the gear structure, and the fitting portion of the gear main body is provided with a noncircular opening fitted to the fitted portion of the support shaft, and spring portions constituting portions of a peripheral wall of the opening and elastically deformable in a diameter direction of the gear main body.
|
