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Pneumatic tire

A technology of pneumatic tires and tire circumferential direction, which is applied to the reinforcement layer of pneumatic tires, special tires, tire parts, etc. The effect of durability

Active Publication Date: 2022-03-18
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PET fiber cords tend to generate heat more easily than conventional nylon fiber cords. In particular, there is a problem that the lower the tension applied to the cord, the easier it is to generate heat.

Method used

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  • Pneumatic tire
  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] The tire size is 225 / 60R18, with figure 1 For the illustrated basic structure and the organic fiber cord (PET fiber cord) constituting the belt cover layer, the modulus of elasticity under a load of 2.0 cN / dtex at 100°C was set as described in Tables 1 and 2 [ cN / (tex·%)], the cord tension in the tire [cN / dtex], and for the covering rubber (belt cover covering rubber) covering the organic fiber cord (PET fiber cord), Table 1 The blending of the rubber composition constituting the covering rubber as described in ~2, the breaking strength at 100°C TB (100°C) [MPa], the elongation at break at 100°C EB (100°C) [%], and the 100°C Tires of Conventional Example 1, Comparative Examples 1 to 5, and Examples 1 to 13 having different storage elastic modulus E1 (100° C.) [MPa] and free sulfur ratio [%].

[0042] In either case, the belt cover layer has a belt formed by aligning one organic fiber cord (PET fiber cord) and covering it with a covering rubber, and is wound spirally in...

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Abstract

Provided is a pneumatic tire with which it is possible to improve durability during high-speed travel and under wet and hot conditions while reducing road noise. A belt cover layer (8) is provided on the outer peripheral side of a belt layer (7) on a tread section (1), said belt cover layer (8) comprising an organic fiber cord wound in a spiral shape in the circumferential direction of the tire, and a polyethylene terephthalate fiber cord having an elastic modulus in the range of 3.5 cN / (tex%) to 5.5 cN / (tex%) at a load of 2.0 cN / dtex at 100 DEG C is used as the organic fiber cord, and the elastic modulus of the polyethylene terephthalate fiber cord at a load of 2.0 cN / dtex at 100 DEG C is in the range of 3.5 cN / (tex%) to 5.5 cN / (tex%). The covering rubber covering the organic fiber cord is composed of a rubber composition. The rubber composition contains at least one selected from the group consisting of natural rubber, styrene butadiene rubber, and butadiene rubber as a rubber component, contains 50 mass% or more of the natural rubber in the rubber component, and contains 5.0 parts by mass to 9.0 parts by mass of zinc oxide per 100 parts by mass of the rubber component.

Description

technical field [0001] The present invention relates to a pneumatic tire using polyethylene terephthalate (PET) fiber cords for a belt cover. Background technique [0002] Pneumatic tires for passenger cars or small trucks generally have a structure in which a carcass layer is spanned between a pair of bead portions, and a multi-layer belt layer is arranged on the outer peripheral side of the carcass layer at the tread portion. A belt covering layer including a plurality of organic fiber cords wound helically in the tire circumferential direction is disposed on the outer peripheral side of the belt layer. In this configuration, the belt covering contributes to the improvement of high-speed durability, and also contributes to the reduction of mid-frequency road noise. [0003] Conventionally, nylon fiber cords have been the mainstream as organic fiber cords used in belt coverings, but it has been proposed to use polyethylene terephthalate fiber cords that are more elastic an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/00B60C9/20B60C9/22D02G3/48
CPCB60C9/00B60C9/20B60C9/22D02G3/48D10B2331/04B60C9/2204B60C2001/0083B60C2009/2214B60C2009/0035B60C2009/2242B60C2009/2209B60C2009/2238B60C2001/0066C08L9/06C08L7/00C08L91/00C08L45/00C08K3/04C08K5/09C08K3/22C08K5/47C08K3/06B60C9/0042B60C9/2003B60C2009/2077B60C2009/2093
Inventor 尾崎诚人张替绅也杉浦裕记中岛美由纪
Owner THE YOKOHAMA RUBBER CO LTD
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