| 摘要 |
<p>A disc rotor (10) is provided with an annular sliding section (11) and a hat section (12) which is provided integrally to the inner peripheral portion of the sliding section (11). The sliding section (11) has an annular braking section (11a) gripped by a pair of front- and rear-side friction pads (20) in a braking operation. Circular blind holes (11a2) are formed in front- and rear-side annular pressure-contact surfaces (S) which are located on the braking section (11a) of the sliding section (11) and with which the friction materials (21) of the brake pads (20) are in pressure contact in a braking operation. The centers of the blind holes (11a2) are disposed at different positions in the radial direction of the rotor. The blind holes (11a2) are arranged at predetermined intervals in the circumferential direction of the rotor. The circular blind holes (11a2) (which reduce a fading phenomenon caused by thermal decomposition gas generated from the friction materials of the brake pads by frictional heat in a braking operation) can reduce the amount of wear of the friction materials (21).</p> |
