| 摘要 |
A rotary brake comprising a disk adapted to have its opposite sides engaged by brake shoes which are in the form of pads arranged to grip the disk between them in the manner of a caliper. The brake disk has a plurality of closed, radially extending passages in which there are slugs of sodium or a similar metal which has a low melting and vaporization point. When the brake disk becomes heated due to the friction of the braking action, the sodium metal melts and vaporizes, thereby absorbing a great deal of heat. The vaporized metal condenses near or at the central portions of the disk, taking the form of small globules which are then thrown outward by centrifugal force toward the large-diameter peripheral portions so as to be ready again for subsequent vaporization. The vaporizing and condensing action of the sodium removes heat from the larger-diameter peripheral portions of the disk, transferring such heat to the inwardly disposed or small-diameter disk portions, thereby effecting a super cooling of the disk at the areas which are being contacted by the brake shoes.
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