| 摘要 |
PURPOSE:To avoid a phenomenon that a stress is concentrated at less rivets by clamping the bottom of a yoke with the flange of a boss member by rivets to form a gap at the connecting portion of the hole of the bottom wall of the yoke with the boss member. CONSTITUTION:A rotor 10 has a boss member 11 engaged with a rotational shaft, and the boss member 11 is formed substantially in a cylindrical shape having a flange 12 formed annularly on the outer periphery of one end. The hole opened at the bottom wall 18 of a yoke 17 and the outer periphery of the member 11 are clamped by rivets 21 at the flange 12 of the member 11 in the state that even when the working tolerance of the hole, the outer periphery and the calked hole of the rivets 21 is accumulated in the worst direction, they are not contacted in the working size, i.e., fluctuation occurs.
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