Heavy duty radial tire structure for lower sidewall and bead, includes metallic reinforcements on either side of wrapped carcass reinforcement, durably resisting reinforcement rupture and fissure propagation

摘要

The first reinforcing layer (60) comprises radial metallic elements wrapped over the carcass reinforcement (1) anchoring bead (2). The second reinforcement (7) has elements slanted with respect to the radial direction and is not wrapped over the rod. It is axially outside the returned carcass reinforcement. The first reinforcing layer (60) comprises radial metallic elements wrapped over the carcass reinforcement (1) anchoring bead (2). The upper internal end (A) is next to the carcass reinforcement, continuing radially inwards in a shortest-route straight-line tangent (T) to the bead rod. Ends of this layer are at radial distances (HL1, HRNC) from the base (D), in the ratio 80-160%. The second reinforcement (7) has elements slanted with respect to the radial direction and is not wrapped over the rod. It is axially outside the returned carcass reinforcement. Preferred features: The outer strand (602), at its upper end, is closer to the axis of rotation than the end of the return (10). HLE is the distance from the end to the base (D), being 0.2-0.8 times the height HRNC of the return (10). Further variants of the construction based on the foregoing principles are described.