WHEEL DISK FOR AUTOMOBILE, AND METHOD FOR MANUFACTURING WHEEL DISK FOR AUTOMOBILE

摘要

To provide a wheel disc which includes a hub fitting part, a rim fitting part and a hat part, and can reduce the whole weight without largely lowering the whole rigidity.SOLUTION: A wheel disc 1 for automobile includes a plate-like hub fitting part 10, a cylindrical rim fitting part 20 and a hat part 30. The hat part 30 includes a hat top part 31, a hat inner peripheral part 32 and a hat outer peripheral part 33. A first connection part 40 that is bent in a direction recessed inside in a disc axial direction is provided on a boundary between the hub fitting part 10 and the hat inner peripheral part 32, and a second connection part 50 bent in a direction recessed inside in a disc axial direction is provided on a boundary between a hat top part 31 and the hat outer peripheral part 33. A plate thickness t1 of the hat outer peripheral part 33 is smaller than a plate thickness t2 of the intermediate portion that is a portion from a boundary p between the first connection part 40 and the hat inner peripheral part 32 in the disc radial direction and a boundary q between the hat top part 31 and the second connection part 50.SELECTED DRAWING: Figure 1