Patent ID: 8882206

Claim:
A vehicle wheel disk comprising a hub coupling portion, a disk flange portion, and an intermediate portion connecting the hub coupling portion and the disk flange portion, the intermediate portion including a hat portion protruding outwardly in an axial direction of the disk, an intermediate inner portion connecting the hat portion and the hub coupling portion, and an intermediate outer portion connecting the hat portion and the disk flange portion, the intermediate outer portion having a vent window formed therein, wherein the hat portion includes a crest portion extending continuously in a circumferential direction of the disk, an inner curved portion curved inwardly in the axial direction of the disk radially inside the crest portion and extending continuously in the circumferential direction of the disk, and an outer curved portion curved inwardly in the axial direction of the disk radially outside the crest portion and extending in the circumferential direction of the disk, wherein the outer curved portion includes a first portion and a second portion offset from the first portion of the outer curved portion in the circumferential direction of the disk and located inner than the first portion of the outer curved portion in a radial direction of the disk, wherein the first portion of the outer curved portion is located between adjacent vent windows, and the second portion of the outer curved portion is located inside the vent window in the radial direction of the disk, wherein the inner curved portion includes a first portion and a second portion offset from the first portion of the inner curved portion in the circumferential direction of the disk and located inner than the first portion of the inner curved portion in the radial direction of the disk, wherein the first portion of the inner curved portion is located radially inside the first portion of the outer curved portion, and the second portion of the inner curved portion is located radially inside the second portion of the outer curved portion, and wherein the crest portion is wavy when viewed in the axial direction of the disk.