Pneumatic motor vehicle tire with self-supporting inserts for driving when punctured has carcass whose extension reduces with increased carcass load

摘要

The tire has an insert(9) in each sidewall area for supporting a punctured tire with little or no internal pressure. The tire carcass(4) is made from a material with a progressive load and extension behaviour which reduces carcass extension as the tensile load on the carcass increases. Inserts(9) may be located inside or outside the carcass layer(4) and extends over a large proportion of the sidewall(8) length. An insert starts to the side of a bead wire(6) and runs to the edge of the tire breaker layer(2). Reinforcing cords in the carcass can comprise mono- or multifilaments. At least one of the filaments can be of a memory retention alloy and at least one other of a different metal or textile. Cord with round cross-section have a diameter of 0.1-2mm, preferably 0.6-1mm and may have a high degree of twist. Cord filaments may have different chemical compositions.