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Pneumatic tire

A technology for pneumatic tires and tires, which is applied to the reinforcement layer of pneumatic tires, tire parts, tire edges, etc., and can solve the problem of insufficient improvement in handling stability and durability of pneumatic tires, and carcass cords. The problem of not being able to fully utilize the characteristics of the cord, etc., to achieve the effect of excellent handling stability and durability

Active Publication Date: 2015-11-25
THE YOKOHAMA RUBBER CO LTD
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AI Technical Summary

Problems solved by technology

[0003] In the cord arrangement of such a semi-radial structure, there is a problem that, in the case of using a nylon fiber cord as the carcass cord, if the carcass cord is placed (fixed) at the time of tire molding vulcanization, etc. In the state where tension in the compression direction is applied to the carcass cord, the carcass cord cannot fully exhibit the original cord characteristics after tire molding and vulcanization, and the steering stability and durability cannot be sufficiently improved.
[0007] However, these proposed pneumatic tires are different from the so-called semi-radial structure tires targeted by the present invention, that is, tires in which the above-mentioned carcass cords are inclined relative to the tire radial direction and measured at the center position in the tread width direction. The angle of the body cord relative to the tire circumferential direction is 55-85°, which does not give any inspiration for the pneumatic tire of the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0047] Examples 1-3, Conventional Examples 1-6

[0048] As test tires, five tires were produced for each of the examples and each of the comparative examples, each of which had a tire size of 225 / 50R1692V, and were mounted on JATMA standard rims to obtain test tires.

[0049] The specifications of the carcass structure of each pneumatic radial tire of each example and each comparative example are as described in Table 1. In terms of carcass structure, it is described as the conventional method is figure 1 construction shown.

[0050] For each test tire, the handling stability, ride comfort performance, load durability performance, and tire weight were measured and evaluated by the test evaluation methods described in the following (B) to (D), and the evaluation results are shown in Table 1. .

[0051] In addition, the method for obtaining the difference in intermediate elongation at 2.0 cN / dtex between the center portion and the side portion of the carcass cord used in the ...

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Abstract

The purpose of the present invention is to provide a pneumatic tire for purposes of racing and the like, having a half-radial structured cord location where a nylon fiber cord is used as a carcass cord, the pneumatic tire fully taking advantage of the inherent cord characteristics of the nylon fiber carcass cord and providing excellent operational stability and durability. The pneumatic tire according to the present invention is a half-radial structured pneumatic tire in which the carcass cord is inclined with respect to a tire radial direction and provided with an angle of 55 to 85º with respect to a tire circumferential direction as measured at a center position in a tread width direction, and is characterized in that: the carcass cord has a modulus of elasticity of 3 to 10 GPa; the carcass cord has a twist coefficient α of 1500 to 2500; and the tire has an intermediate elongation difference of not more than 1.0% at 2.0 cN / dtex between a center portion and a side portion of the carcass cord, where the twist coefficient α = N × √T, N is the number of twists per 10 cm in length of the fiber cord, and T is the fineness (dtex) of the fiber cord.

Description

technical field [0001] The present invention relates to pneumatic tires. Background technique [0002] Racing tires that require high handling stability when running at high speeds, some are formed into so-called semi-radial tires, that is, carcass cords that are inclined relative to the radial direction of the tire and measured at the center position in the tread width direction The angle with respect to the tire circumferential direction is 55° to 85°, and in this case, some carcass cords are made of nylon fiber cords. [0003] In the cord arrangement of such a semi-radial structure, there is a problem that, in the case of using a nylon fiber cord as the carcass cord, if the carcass cord is placed (fixed) at the time of tire molding vulcanization, etc. In a state where tension in the compression direction is applied to the carcass cords, the carcass cords cannot fully exhibit their original cord properties after tire molding and vulcanization, and the steering stability a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/02B60C9/00B60C9/08
CPCB60C9/06B60C2009/0433B60C2009/0466B60C15/0045B60C9/09
Inventor 中岛美由纪
Owner THE YOKOHAMA RUBBER CO LTD
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