Provided is a technology with which, in a tire including a spiral cord layer in a crown portion, the occurrence of separation at a tire width-direction end of the spiral cord layer can be inhibited. A tire (10) includes: a carcass (14), which toroidally extends between a pair of bead portions; and a spiral cord layer (1), which is arranged on a tire radial-direction outer side of the carcass in a crown portion and in which an upper layer (1A) and a lower layer (1B) are formed by spirally winding reinforcing cords. In this tire (10), the reinforcing cords of the spiral cord layer have an angle in a range of 10 to 45 with respect to a tire circumferential direction, a belt under-cushion rubber (18) is arranged on a tire radial-direction inner side of a tire width-direction end of the spiral cord layer, and the belt under-cushion rubber has a 100% modulus in a range of 1 to 6 MPa.

A band 12 includes a center portion C, a pair of intermediate portions M, and a pair of outer end portions E. The center portion C is formed from a first band member 40 and that extends in a circumferential direction. Each intermediate portion M is formed from a second band member 42 and that extends so as to form a mesh-like shape. The second band member 42 includes a plurality of first tilt portions 44 extending so as to be tilted relative to the circumferential direction and a plurality of second tilt portions 46 extending so as to be tilted relative to the circumferential direction in a direction opposite to a direction in which the first tilt portions 44 are tilted. Each outer end portion E is formed from a third band member 54 and that extends in the circumferential direction.

A pneumatic tire having a carcass and a belt reinforcing structure, the belt reinforcing structure comprising: a zigzag belt reinforcing structure formed of a strip of one or more reinforcement cords, the strip of one or more reinforcement cords being inclined at 5 to 30 degrees relative to the centerplane of the tire extending in alternation to turnaround points at each lateral edge, wherein the zigzag strip of cords is formed from two different reinforcement cords made of different materials, and a low angle belt of the tire has a higher EPI than the zigzag belt.

Protective reinforcement (3) for a tire has a mean radial thickness T at least equal to two times the diameter D of a reinforcer (4), the protective reinforcement (3) comprises respectively on its radially interior face (31) and on its radially exterior face (32) parts (7) made of elastomeric compound having an axial width W at least equal to the diameter D of a reinforcer (4), and the path of any reinforcer (4), in the circumferential direction (XX) of the tire, varies radially between the radially interior first face (31) and the radially exterior second face (32), in such a way that the set of paths of the reinforcers (4) of the protective reinforcement (3) constitutes a three-dimensional lattice.

Protective reinforcement (3) for a tire has mean radial thickness T at least equal to two times diameter D of reinforcer (4), and comprises respectively on its radially interior face (31) and on its radially exterior face (32) parts (7) made of elastomeric compound having axial width W at least equal to diameter D of reinforcer (4). The path of any reinforcer (4), in circumferential direction (XX), varies radially between radially interior first face (31) and radially exterior second face (32), in such a way that the set of paths of reinforcers (4) of protective reinforcement (3) constitutes a three-dimensional lattice. Furthermore, protective reinforcement (3) comprises a first family of reinforcers (41) each having a path, in the circumferential direction (XX), contained in circumferential plane (XZ) and a second family of reinforcers (42) each having a path, in the circumferential direction (XX), that follows a zigzag curve.

A tire including a spiral cord layer constituted by a reinforcing cord in a crown portion of the tire, in which the occurrence of separation between the spiral cord layer and an auxiliary belt layer is suppressed when the auxiliary belt layer is arranged on a tire radial-direction outer side of the spiral cord layer. The tire includes: a carcass which toroidally extends between a pair of bead portions; and a spiral cord layer which is arranged on the tire radial-direction outer side of the carcass in the crown portion and in which an upper layer and a lower layer are formed by spirally winding a reinforcing cord. An auxiliary belt layer is arranged on the tire radial-direction outer side of the spiral cord layer, and belt cords of the auxiliary belt layer have an angle in a range of 30 to 90 with respect to a tire circumferential direction.

A reinforcement structure for a polymer ply includes a plurality of flat woven cords. Each flat woven cord has a width between 0.5 mm and 1.6 mm and a thickness between 0.2 mm and 0.8 mm thereby producing the reinforcement structure with an overall width between 25.0 mm and 26.0 mm. Each flat woven cord includes materials with melting points between 130 C. and 230 C.

This disclosure relates to a tire including a spiral cord layer and core-material cord layer arranged between an upper and lower layer of spiral cord layer in a tire crown portion, both the occurrence of groove cracking and occurrence of separation from width-direction end of core-material cord layer can be suppressed. The tire can include carcass which toroidally extends between pair of bead portions; spiral cord layer which is arranged on tire radial-direction outer side of carcass in crown portion and in which an upper and lower layer are formed by spirally winding reinforcing cord; and core-material cord layer which is arranged between upper and lower layer of spiral cord layer. The reinforcing cord of spiral cord layer are composed of carbon fibers, and core-material cords of core-material cord layer have an angle in a range of 0 to 50 with respect to a tire circumferential direction.

Provided is a tire including a spiral cord layer formed by spirally winding a reinforcing cord, in which tire the occurrence of uneven wear attributed to the spiral cord layer is suppressed. The tire includes: a carcass (14) which toroidally extends between a pair of bead portions; and a spiral cord layer (1) which is arranged on the tire radial-direction outer side of the carcass in a crown portion and in which an upper layer (1A) and a lower layer (1B) are formed by spirally winding a reinforcing cord. At least one circumferential belt-reinforcing layer (17), whose cord direction is substantially a tire circumferential direction, is arranged on the tire radial-direction outer side of the spiral cord layer, and a tire widthwise length We of the circumferential belt-reinforcing layer is in a range of 40% to 90% of a tire widthwise length Ws of the spiral cord layer.

A tire that has a spiral cord layer including reinforcing cords on a tire crown portion to inhibit breakage of the reinforcing cords caused by a projection input given to an end of the spiral cord layer during running. The tire includes: a carcass toroidally extending between a pair of bead portions; and a spiral cord layer 1 disposed tire-radially outside the crown portion of the carcass and including an upper layer and a lower layer that are formed by spirally winding the reinforcing cords. An auxiliary belt layer is disposed tire-radially outside the spiral cord layer and an angle of belt cords in the auxiliary belt layer with respect to a tire circumferential direction is in a range of 0 to 45.