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.

The tire includes: a carcass toroidally extending between a pair of bead portions; a spiral cord layer arranged on an outer side in a tire radial direction of a crown portion of the carcass and in which an upper layer and a lower layer are formed by spirally winding a reinforcing cord; and an auxiliary belt layer arranged on the outer side in the tire radial direction of the spiral cord layer. At least at ends in a tire width direction of a region where the spiral cord layer and the auxiliary belt layer are laminated, a 100% modulus of at least a rubber other than a coating rubber of the auxiliary belt layer among rubbers interposed between the spiral cord layer and the auxiliary belt layer is lower than a 100% modulus of the coating rubber of the auxiliary belt layer.

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 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.

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.

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 pneumatic tire includes a carcass, an intersecting belt layer, and a restraining member. The carcass spans from one bead portion to another bead portion. The intersecting belt layer is arranged at an outer circumferential side of the carcass and is configured including plural belt plies each configured by covering a row of plural mutually parallel belt cords with a resin, such that the belt cords of one of adjacent belt plies and the belt cords of the other of the adjacent belt plies intersect each other. The restraining member is arranged adjacent to end portions of the belt plies so as to restrain movement of the end portions.

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.

The present invention provides: a reinforcement member that includes a core material cord layer and a spiral cord layer including a reinforcement cord and arranged outside the core material cord layer, the reinforcement member being capable of improving tire longevity by suppressing breakage of the reinforcement cord due to fretting (wear) between a core material cord and the reinforcement cord; and a tire using the same. Provided are: a reinforcement member (1) that includes a core material layer (2) and a spiral cord layer (3) including a reinforcement cord (3a) spirally wound around the core material layer (2), in which the core material layer (2) includes a plate-like body made of a resin material having a chamfered end portion in a widthwise direction of the reinforcement member (1); and a tire using the same.