| 摘要 |
1,016,536. Pneumatic tyres. GOODYEAR TIRE & RUBBER CO. Sept. 24, 1964 [Oct. 9, 1963], No. 39049/64. Heading B7C. To provide both good tread wear and good sidewall durability, in a pneumatic tyre having parallel cord carcass plies 12 extending from bead to bead the ratio in radial cross-section contacting the tyre axis of sectional height SH to maximum sectional width SD of the inflated carcass is between 0.6 and 0.85, the cord angle of the plies 12 and of breaker plies 15 being between 32 degrees and 45 degrees, and 20 degrees and 27 degrees respectively to the midplane and the carcass when inflated has a greater sectional height and lesser maximum sectional width than when uninflated. The tyre is cured in a mould and the ratio SH to SD of the carcass when in the mould is up to 25% less than when it is inflated, the sectional height being 3 to 15% greater when the tyre is inflated than when it is in the mould. The cords of the plies 12 are of a synthetic textile e.g. rayon, nylon, and those of the plies 15 of a synthetic textile, metallic wire or glass fibre. |
