| 摘要 |
<p>The present specification discloses a wheel incorporating a braking disc (9). In certain wheels where high duty braking discs (9) are required, the discs (9) are mounted one on each side of the web (5) of the wheel by bolts which pass through spaced apart holes in the discs. These holes, besides reducing the available braking area also act as centres for surface cracking, this surface cracking occurring around the bolt holes as a result of the large internal stresses set up by differential thermal expansion. The present invention provides an annular braking disc (9) comprising at least two curved segments (11) mounted on each side of the web (5) of the wheel, each segment (11) being secured to the web (5) by at least one gripping member (13) which is secured to the web (5) and grips the outer circumferential edge of the disc segment (11) via an intermediate member (23), and by at least one resilient retaining connection (15) at each end (17) of the segment. Each resilient retaining connection (15) is secured to the web (5) and engages a surface provided on an end region (17) of a disc segment (11). Thus whilst the outer edge of a segment (11) can slide circumferentially relative to the gripping members (13) under thermal expansion, the end regions (17) can also slide over said resilient retaining connections (15) whereby minimal internal stresses are produced in the segments (11).</p> |
