| 摘要 |
PURPOSE: Assembling structure of a rod wheel, a brake disk and a hub is provided to increase the rigidity of the brake disk and tightening torque of the brake disk and the hub, and to prevent torque vibration and noise in braking by dividing a wheel nut into a first assembling part and a second assembling part. CONSTITUTION: A rod wheel(31), a brake disk(19) and a hub(29) are assembled with a wheel bolt(25) and a wheel nut(27). The wheel nut is composed of a first assembling part(33) combined with the wheel bolt, and a second assembling part(35) inserted to the brake disk and the hub and combined with the first assembling part in assembling the first assembling part with the wheel bolt. Tightening torque is increased with placing second assembling parts of the wheel nut in four portions of the wheel bolt, and the balance of the brake disk is kept without concentration of stress. Reversion of torque penetrating the brake disk and the hub is prevented with combining the second assembling part with the first assembling part by keeping clearance. Noise and vibration are prevented with keeping constant torque of the brake against transmission torque. Deformation is minimized with integrally combining assembling parts, the rod wheel, the brake disk and the hub.
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