| 摘要 |
1313663 Vehicle tyres CATERPILLAR TRACTOR CO 23 June 1970 [23 June 1969] 30320/70 Heading B7C An oval pneumatic tube tyre comprises an inflatable integral hollow toroidal tube member 21 having an oval cross-section and a flat crown 34, an integral first ply of inextensible reinforcing 30 formed by helically winding the reinforcing about the tube to form loops normal to the circumferential plane of the tube, valve stem integral with the tube and projecting between the loops on the inner surface of the tube, a circumferential belt ply 41 formed by helically winding inextensible reinforcing around the tyre crown over the first ply to form loops 45 parallel to said plane, and elastomeric material forming the tread 61 and casing 60, 62, 63 of the tyre. Roll resisting hoops 27 formed of either extensible or inextensible filaments coated with elastomer are received in grooves provided in the tube members during manufacture. The tyre may also be provided with elastomer shoulders 42, a layer of fabric 43, a layer of elastomer 44, fabric reinforcing 91, a coiled side wall reinforcing filament 92, a curb guard and an internal bumper 90. The tread together with the ply 41 may be formed separately from the tyre carcass to render it replaceable. The tyre in use is mounted on a split wheel rim 70 the halves of which when bolted together grip a centering ring 64. During manufacture a mandrel is formed on which to fabricate the tube, said mandrel consisting of a mixture of cork, sand, sodium silicate and iron oxide fused together by carbon dioxide and then baked. The tyre is built up on the core and after vulcanization, a 25% solution of sodium hydroxide and is introduced into the tube through the valve stem which allows the core to be washed out. |
