TIRE

• US 20200130415A1
• Filed: 12/10/2019
• Published: 04/30/2020
• Est. Priority Date: 06/12/2017
• Status: Abandoned Application

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: SASAKI, Yosuke
• Application Number:
  US16/708,978
• Publication Number:
  US 20200130415A1
• Time in Patent Office: Days
• CPC Class Codes: B60C 2009/2214 characterised by the materials of the zero degree ply cords
• CPC Class Codes: B60C 2009/266 combined with non folded cut-belt plies
• CPC Class Codes: B60C 3/04 characterised by the relative dimensions of the section, e.g. low profile B60C3/06 takes precedence
• CPC Class Codes: B60C 9/0028 Reinforcements comprising mineral fibres, e.g. glass or carbon fibres
• CPC Class Codes: B60C 9/0042 Reinforcements made of synthetic materials
• CPC Class Codes: B60C 9/005 Reinforcements made of different materials, e.g. hybrid or composite cords
• CPC Class Codes: B60C 9/023 built up from narrow strips, individual cords or filaments, e.g. using filament winding
• CPC Class Codes: B60C 9/08 the cords extend transversely from bead to bead, i.e. radial ply B60C9/07 takes precedence
• CPC Class Codes: B60C 9/22 the plies being arranged with all cords disposed along the circumference of the tyre
• CPC Class Codes: B60C 9/2204 obtained by circumferentially narrow strip winding
• CPC Class Codes: B60C 9/263 further characterised by an endless zigzag configuration in at least one belt ply, i.e. no cut edge being present
• CPC Class Codes: B60C 9/28 characterised by the belt or breaker dimensions or curvature relative to carcass B60C9/30 takes precedence

Abstract

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.

Claims

1. A tire comprising:

a carcass which toroidally extends between a pair of bead portions; and

a spiral cord layer which is arranged on a tire radial-direction outer side of the carcass in a crown portion and in which an upper layer and a lower layer are formed by spirally winding a reinforcing cord,

wherein

at least one circumferential belt-reinforcing layer, 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.

2. The tire according to claim 1, comprising a core-material cord layer between the upper layer and the lower layer of the spiral cord layer.

3. The tire according to claim 1, wherein cords of the circumferential belt-reinforcing layer comprise any one selected from nylon fibers, polyester fibers, aramid fibers, carbon fibers, glass fibers, polyketone fibers, poly-p-phenylene benzobisoxazole fibers, and polyarylate fibers, or a hybrid cord having two or more thereof.

4. The tire according to claim 2, wherein core-material cords of the core-material cord layer have an inclination angle of 40°

to 90°

with respect to the tire circumferential direction.

5. The tire according to claim 2, wherein cords of the circumferential belt-reinforcing layer comprise any one selected from nylon fibers, polyester fibers, aramid fibers, carbon fibers, glass fibers, polyketone fibers, poly-p-phenylene benzobisoxazole fibers, and polyarylate fibers, or a hybrid cord having two or more thereof.

6. The tire according to claim 5, wherein core-material cords of the core-material cord layer has an inclination angle of 40°

to 90°

with respect to the tire circumferential direction.