A ply of a carcass 10 of a pneumatic radial tire includes a turn-up ply 11 and a down ply 12. The turn-up ply 11 includes: a main body portion 11a disposed between a pair of bead cores 6; and turn-up portions 11b turned up around the respective bead cores 6 from an inside toward an outside in a tire width direction. The down ply 12 extends up to at least an inside in a radial direction of the bead cores 6 so as to cover the turn-up ply 11 including the turn-up portions 11b from an outside. A curvature 12w (41w) is formed at at least either one of a down ply predetermined portion 12P of the down ply 12, which covers a turn-up end portion 11be of the turn-up portion 11b of the down ply 12 from an outside in the tire width direction, and a turn-up ply predetermined portion (41P) that covers the turn-up end portion 11be of the turn-up portion 11b in the main body portion 11a of the turn-up ply 11 from an inside in the tire width direction. Thereby, high pressure resistance can be maintained and durability can be enhanced in the radial tire, while reduction in weight can be promoted.
PNEUMATIC RADIAL TIRE
RADIALLUFTREIFEN
PNEU RADIAL
2022-07-20
Patent
Electronic Resource
English
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |