| 摘要 |
The serrated portions of the studs are fitted in those portions of the mounting holes 14 close to the other side face of the mounting flange 13 b. Accordingly, the radially outer portion of the mounting flange 13 b is deformed to the one side face. At the radially outer portion of the one side face and throughout the circumference, there is formed a taper face 28 a, which is inclined the closer to the other side face as it goes the closer to the radially outer side. As a result, the aforementioned problem can be solved because the radially outer potion of the one side face does not protrude from a flat face 29 formed at the radially inner portion of the one side face even with that deformation. Moreover, the taper face 28 a can be formed at a low cost by a lathe-turning.
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