초록 ▼

A disc wheel for a passenger car has a plate-like rim and a plate-like disc, the disc having a hub mounting portion extending in a direction perpendicular to an axis thereof, a hat middle portion continuously extending from the hub mounting portion toward an outer side in a radial direction and an o

A disc wheel for a passenger car has a plate-like rim and a plate-like disc, the disc having a hub mounting portion extending in a direction perpendicular to an axis thereof, a hat middle portion continuously extending from the hub mounting portion toward an outer side in a radial direction and an outer side in an axial direction, a hat top portion continuously extending from the hat middle portion, and a ventilation hole portion continuously extending from the hat top portion toward an inner peripheral surface of the rim 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.

대표청구항 ▼

[ What is claimed is:] [1.]1. A disc wheel for a passenger car comprising a rim and a disc, said disc having a hub mounting portion extending in a direction perpendicular to an axis thereof, a hat middle portion continuously extending from said hub mounting portion toward an outer side in a radial d

[ What is claimed is:] [1.]1. A disc wheel for a passenger car comprising a rim and a disc, said disc having a hub mounting portion extending in a direction perpendicular to an axis thereof, a hat middle portion continuously extending from said hub mounting portion toward an outer side in a radial direction and an outer side in an axial direction, a hat top portion continuously extending from said hat middle portion, a ventilation hole portion continuously extending from said hat top portion toward an inner peripheral surface of the rim and a flange portion continuously extending from said ventilation hole portion and fitted to the inner peripheral surface of the rim, and said rim inner peripheral surface and the disc flange being welded,wherein a thickness of said disc wheel is varied in a diametrical direction at at least one of said hub mounting portion, the hat middle portion, the hat top portion, the ventilation hole portion and the flange portion,wherein the thickness of said hub mounting portion is equal to or smaller than an original thickness of a raw material, the thicknesses of said hat middle portion and the hat top portion are smaller than that of the hub mounting portion, the thickness of said ventilation hole portion is the original thickness of the raw material, and the thickness of said flange portion is smaller than the thickness of any portions between said hub mounting portion and the ventilation hole portion.