Patent ID: 7152643
Filing Date: 2006-12-26
Classification: B60B,B60C

Abstract:
1. A rim wheel comprising: three or more sub-air chambers which are formed between a rim and a plurality of cap members disposed outwardly in a radial direction of the rim, by no less than three sealed diaphragms which divides one sub-air chamber into three or more sub-air chambers, the one sub-air chamber being defined by the rim and the cap members, the sub-air chambers being discontinued in a rim circumferential direction, and the sealed diaphragms being separated from each other at predetermined intervals in the rim circumferential direction; a concave well portion which is provided at at least one of the rim and the cap members, and has a bottom portion positioned radially inward of a bead seat; and a communicating portion which is provided at each of the cap members thus allowing a tire main air chamber and the sub-air chambers to communicate with each other, characterized in that a Helmholtz resonance noise absorber is constituted by the sub-air chambers and the communicating portion, which satisfy the following equation: f V: a volume of sub-air chambers (cm S: a total cross-sectional area of communicating portions (cm L: a length of a communicating portion (cm) N: the number of communicating portions/air chamber R: a wheel diameter (inch).