| 摘要 |
PURPOSE:To make it possible to obtain a sufficient fixing strength, by forming the cross-sectioned shapes of both center and small diameter sections of a pin in non-circular shapes, and by ensuring a sufficient area for the seat surface section of the pin. CONSTITUTION:A stud pin 28 has its center section 56 which is in an oval cross-sectioned shape elongated substantially in the circumferential direction of a disc. Further, small diameter sections 57 formed at both ends of the stud pin 28 have a substantially circular shape concentric with the center B. Thus, since the stud pin 28 has its center section 56 elongated in the circumferential direction of the disc, the seating sections between the center section 56 and the small diameter sections 57 may have a large area. Accordingly, it is possible to enhance the fixing strength of the stud pin 28 to a subplate 26.
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