| 摘要 |
A tyre bead reinforcement comprises a circumferentially inextensible core c enclosed in elastomeric material, the material forming the outer surface of the reinforcement having a lower vulcanising speed than the remainder of the elastomeric material in the reinforcement. Semi- vulcanisation of the reinforcement prior to assembly in a tyre results in the material immediately surrounding the core c being sufficiently vulcanised to prevent distortion of the core c during tyre building while the material constituting the outer surface is still unvulcanised so as to enable satisfactory adhesion of the reinforcement to adjacent components of the tyre during building without any additional treatment of the reinforcement, e.g. application of an adhesive. As illustrated a wire core c is surrounded by elastomer 1 surrounded by an elastomer filler 3, the latter being covered by a spirally wound strip of elastomer 2 containing heat shrinkable cords 5 and in turn covered by a layer of elastomer 4. The vulcanising speeds of these components are in the order 1>/=3>2>4. <IMAGE> |
