Patent ID: 8851577

Claim:
A cap attachment structure, comprising: a cap that is attached to a wheel of a vehicle; a first elastic deformation portion that is provided at the cap, the first elastic deformation portion being elastically deformed and engaging with the wheel while the cap is attached to the wheel; a second elastic deformation portion that is provided at the cap, the second elastic deformation portion not abutting the wheel and not being elastically deformed while the cap is attached to the wheel, and the second elastic deformation portion being elastically deformed by engaging with the wheel when the cap is detached from the wheel, a slid portion that is provided at the wheel, and a sliding portion that is provided at the cap and angularly offset from the first elastic deformation portion, wherein the slid portion abuts the first elastic deformation portion and the sliding portion abuts the slid portion and the first elastic deformation portion while the cap is attached to the wheel, wherein the second elastic deformation portion is moved without being elastically deformed by the wheel after the cap is attached to the wheel and a temperature at the cap is raised to an assumed maximum temperature and the cap expands while the cap is attached to the wheel, and the second elastic deformation portion is moved without being elastically deformed by the wheel when the temperature at the cap is raised to the assumed maximum temperature and the cap expands and slides the sliding portion on the slid portion while the cap is attached to the wheel.