| 摘要 |
<p>A vehicle wheel disk includes a hat portion having a crest portion 15a extending continuously in a circumferential direction of the disk, an inner curved portion 15d curved inwardly in an axial direction of the disk radially inside the crest portion 15a and extending continuously in a circumferential direction of the disk, and an outer curved portion 15c curved inwardly in the axial direction of the disk radially outside the crest portion 15a and extending in the circumferential direction of the disk. When viewed in the axial direction of the disk, the hat portion 15 having the crest portion 15a and the inner curved portion 15d continuous in the circumferential direction of the disk is wavy in shape.</p> |
