| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress offset of phase on contact parts of a disk wheel and a brake rotor, and of the brake rotor and a hub flange without increasing weight and cost.SOLUTION: The hub 12 has plural hub flanges 12f for fixing a brake rotor 40 and a disk wheel 42. The hub flanges are projected in a radial state and have a through hole 12h into which a fastening member 14 is inserted. The wheel is made of steel, and on the periphery of the through hole, a thin-thickness region is provided. An outer diameter end of the flange part is formed so as to hang over the thin-thickness region. The wheel is fixed to the flange part via the fastening member in a contacting state with the rotor. Matching ranges of phases of contact parts A42, A421 of the wheel and the rotor and a contact part A12 of the rotor and the flange part exist in an inner diameter side and an outer diameter side of the flange part. The matching range in the outer diameter side is divided into two in a peripheral direction, the wheel is supported at 3 points, 1 point in the inner diameter side, and 2 points in the outer diameter side.</p> |
