| 摘要 |
1501434 Pneumatic tyres GOODYEAR TIRE & RUBBER CO 23 April 1975 [22 July 1974] 16792/75 Heading B7C A pneumatic tyre comprises a carcass 11 having cords inclined at 75-90 degrees to the circumferential, and a breaker assembly 13 having cords of a material with a modulus of at least 150 grams per denier disposed at 17-26 degrees to the circumferential; in the asmoulded state of the tyre as illustrated in Fig. 1 the radially outer surface of the tyre tread, as viewed in cross-section, having a central region 23 curved with a constant radius of curvature TR and lateral regions 28 extending from the central region whose distance from the centre of curvature of the central region is greater than TR, and the position of maximum crosssectional width SD of the tyre being spaced radially from the bead baseline B of the tyre by a distance H greater than 55% of the section height SH of the tyre. When the tyre is mounted on the wheel rim for which it is designed and inflated to its normal working pressure the radially outer surface of the tread as viewed in cross-section becomes curved with a constant radius of curvature across the whole width of the tread, and the distance H is reduced. As viewed in cross-section the lateral regions 28 of the tread surface of the as-moulded tyre may be rectilinear and tangential to the central region 23 of the surface, the region 23 having a width CTP equal to half the total tread width TAW. |
