| 摘要 |
A disc rotor 10 has an annular sliding portion 11 and a hat portion 12 integrally provided at the inner periphery of the sliding portion 11. The sliding portion 11 has an annular braking portion 11a which is nipped between front and back friction pads 20 at the time of braking. A plurality of circular non-penetrating holes 11a2 are provided on front and back annular contact surfaces S of the braking portion 11a of the sliding portion 11 against which friction materials 21 of the corresponding brake pads 20 are pressed at the time of braking. The centers of the non-penetrating holes 11a2 are located at different positions in the rotor radial direction. The non-penetrating holes 11a2 are disposed at predetermined intervals in the rotor circumferential direction. Thus, it becomes possible to reduce the amount of wear of the friction materials 21 caused by the circular non-penetrating holes 11a2 (provided for restraining fading which occurs due to gas generated from the friction materials of the brake pads through thermal decomposition caused by friction heat at the time of braking).
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