| 摘要 |
<p>PROBLEM TO BE SOLVED: To uniform rigidity of a disc rotor in a circumferential direction.SOLUTION: A disc rotor is of an annular ventilated type. Eight fastening parts 46 are formed at equal intervals in a circumferential direction at an outer peripheral edge of one plate-like member 40, and groove parts 48 are formed on both sides of the fastening parts 46. Also, 72 fins 44 are uniformly provided in the circumferential direction. the number of the fins 44 is 9 times as many as the number of the fastening parts 46. In this manner, the fastening parts 46 are provided at equal intervals, and the fins 44 are provided at equal intervals. A relative positional relationship of the fins 44 to the respective fastening parts 46 is identical, and therefore, rigidity of the disc rotor in the circumferential direction can be made uniform. As a result, waviness during braking can be reduced.</p> |
