| 摘要 |
A braking band (2) for a disk-brake disk (1) which is capable of exceptionally quiet braking comprises at least two plates (3, 3') connected to one another by connecting elements (4), in which the space between the plates (3, 2') forms an internal air-duct (7) for the cooling of the braking band (2). At least one of the cooling of the braking band (2). At least one of the plates (3, 3') has, in one of its surfaces (8, 8') defining the air-ducts (7), at least one groove (10, 10') which extends along at least a portion of an orbit around the axis of symmetric (s) of the disk (1) and the cross-section of which becomes wider towards the air-duct (7).
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