| 摘要 |
PURPOSE:To maintain the fitting accuracy of a metal plate to a disk hub to highly accurate by fitting a disk shaped metal plate, to which a ring member with plural engaging parts is fitted in one body at its outer circumference side, to a metal plate supporting member, which is fixed firmly on a disk substrate. CONSTITUTION:A metal plate 6 own is not provided with the engaging part, but a ring member 5, which has plural engaging parts 4 and is made of synthetic resin, is fitted in one body to the outer circumference side of the metal plate 6, and the engaging parts 4 of the ring member 5 are engaged and anchored and fixed to the engaged part 7 of a metal plate supporting member 8. Thus, the fitting position accuracy and the fitting strength of the metal plate 6 inside the metal plate supporting member 8 are improved, and the fitting accuracy of the metal plate 6 to the disk hub 2 and be maintained to be highly accurate.
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