| 摘要 |
<p>A disc wheel for a passenger car has a plate-like rim (1) and a plate-like disc (2), the disc (2) having a hub mounting portion (3) extending in a direction perpendicular to an axis thereof, a hat middle portion continuously extending from the hub mounting portion (3) toward an outer side in a radial direction and an outer side in an axial direction, a hat top portion (4) continuously extending from the hat middle portion, and a ventilation hole portion (6) continuously extending from the hat top portion toward an inner peripheral surface of the rim (1) and a flange portion continuously extending from the ventilation hole portion and fitted to the inner peripheral surface of the rim. In the disc wheel, the rim inner peripheral surface and the disc flange are welded. Further, the disc has ventilation holes. In the disc wheel for the passenger car, in order to reduce a weight without reducing a fatigue life in a rotational bending fatigue test, a thickness of the disc wheel is varied in a diametrical direction at at least one of the hub mounting portion, the hat middle portion, the hat top portion, the ventilation hole portion and the flange portion. <IMAGE></p> |
