| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a problem of lowering longevity of a double row rolling bearing and a constant velocity joint due to early thermal deterioration of a lubricant as temperature is synergistically apt to rise since heat generated from the double row rolling bearing and the constant velocity joint is conducted to each other when the double row rolling bearing and the constant velocity joint are installed on a hub wheel in a state of their approaching each other and the inside of the double row rolling bearing is in a roughly sealed state by a sealing means made of a seal ring. SOLUTION: It is possible to prevent deterioration of the lubricant in the inside of the double row rolling bearing 6 and to increase longevity of members as a flow of air is generated around a fin 33 for heat radiation and heat is radiated and consequently, temperature rise is restrained as the fin 33 for heat radiation is rotated since a large number of the fins 33 for heat radiation projected along the shaft center direction and outward in the diametrical direction are formed on an outer peripheral surface of a second seal ring 32 though temperature in the inside of the double row rolling bearing 6 rises as the hub wheel 2 and the constant velocity joint 5 are rotated.</p> |
