| 摘要 |
PROBLEM TO BE SOLVED: To realize a crown structure allowing substantial improvement in rigidity of a crown without complicating a structure around the crown, and to prevent or reduce bending of the crown caused by a shock. SOLUTION: In this crown structure, an annular groove part 21a formed in a head part 21 has an opening part on the extending side of a shaft part 22, while an opening step part 21b formed on the inner part side of the annular groove part 21a and an opening step part 21c formed on the opening part side of the annular groove part 21a are formed near the opening part. A support ring 16 is fitted in the opening step part 21b. A play prevention ring 13 is fitted in a step face between the inner circumferential face of the support ring 16 and the opening step part 21b. A press ring 17 is fitted in the opening step part 21c, while the press ring 17 is fixed to the head part 21 by caulking an edge frame part 21d formed in an opening edge part of the annular groove part 21a.
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