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Pneumatic tire

A pneumatic tire, tire circumferential technology, applied to the reinforcement layer of pneumatic tires, tire parts, transportation and packaging, etc., can solve the problems of reduced elastic modulus, reduced handling stability, etc., to prevent lowering and ensure stable handling performance and durability

Inactive Publication Date: 2021-09-28
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the elastic modulus (rigidity) of PET fiber cords is temperature-dependent, and the elastic modulus (rigidity) may decrease during ultra-high-speed driving such as circular road driving, resulting in reduced steering stability.

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0032] Made a tire size 235 / 40R18 with figure 1 The basic structure is illustrated and the structure of the steel cord constituting the belt layer, the wire diameter (cord diameter) and the type of organic fiber used for the organic fiber cord constituting the belt reinforcement layer, and 2.0 of the organic fiber cord Tires of Conventional Example 1, Comparative Examples 1 to 3, and Examples 1 to 5 having different elongation at cN / dtex load as shown in Table 1.

[0033] In either case, the belt reinforcement layer has a belt formed by aligning one organic fiber cord (nylon 66 fiber cord or PET fiber cord) and covering it with a covering rubber, and is wound spirally in the tire circumferential direction. Wrapped seamless construction. The cord implantation density in the tape was 50 cords / 50mm. In addition, the organic fiber cord (nylon 66 fiber cord or PET fiber cord) had a structure of 1400 dtex / 2 in Conventional Example 1 and Comparative Example 2, and had a structure o...

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Abstract

Provided is a pneumatic tire that is provided with a belt reinforcement layer comprising an organic fiber cord and can maintain the durability and at the same time exhibit improved handling stability when traveling on ordinary roads and on race tracks. In a tread part 1, a belt layer 7 disposed on the outer peripheral side of a carcass layer 4 comprises a monofilament wire having a strand diameter of 0.30 mm to 0.45 mm, and a belt reinforcement layer disposed on the outer peripheral side of the belt layer 7 comprises an organic fiber cord comprising a polyethylene terephthalate fiber and having an intermediate elongation of 2.0% to 4.0% under a load of 2.0 cN / dtex.

Description

technical field [0001] The present invention relates to a pneumatic tire provided with a belt reinforcement layer made of organic fiber cords, and more specifically, to a pneumatic tire capable of improving steering stability during normal running and looping while maintaining durability. Background technique [0002] In a pneumatic tire, a carcass layer is spanned between a pair of bead portions, a multi-layer belt layer is arranged on the outer peripheral side of the carcass layer at the tread portion, and a multilayer belt layer is arranged on the outer peripheral side of the belt layer. A belt reinforcement layer of a plurality of organic fiber cords wound helically in the tire circumferential direction. Such a belt reinforcing layer suppresses warpage (Japanese: せり上がり) of the belt end during high-speed running, and thus contributes to improvement of high-speed durability. [0003] As the organic fiber cords used in such a belt reinforcing layer, nylon fiber cords are t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/00B60C9/20
CPCB60C9/2009B60C2009/2016B60C2009/2214B60C9/0064B60C9/0042B60C2009/0071B60C9/0007B60C2009/2077B60C2009/2083B60C9/1821B60C9/20B60C2009/2093
Inventor 藤森弘章张替绅也
Owner THE YOKOHAMA RUBBER CO LTD
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