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Pneumatic tire

A technology of pneumatic tires and tires, which is applied to the reinforcement layer of pneumatic tires, special tires, tire parts, etc., which can solve the problems of deterioration of handling stability and reduced torsional rigidity of bead parts, etc., to improve handling stability and improve The effect of ride comfort performance

Pending Publication Date: 2021-03-26
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a method, the in-plane torsional rigidity of the bead portion becomes small, so that there is a problem that the steering stability performance deteriorates.

Method used

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  • Pneumatic tire
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Examples

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Embodiment Construction

[0031] Hereinafter, one embodiment of the present invention will be described based on the drawings.

[0032] figure 1 It is a tire meridian cross-sectional view of a pneumatic tire (hereinafter, may be simply referred to as a "tire" in some cases) 1 according to this embodiment, including a tire rotation axis (not shown). figure 1 For example, a tire 1 for a passenger car is shown. However, the present invention can also be applied to tires 1 for heavy loads and the like.

[0033] In this specification, unless otherwise specified, the size of each part of the tire 1 is a value determined when the bead part is held in a state not assembled to the rim to match the rim width specified by the tire size.

[0034] In the present embodiment, the tire 1 satisfies the following expressions (1) and (2) when Wt (unit: mm) is the tire cross-sectional width and Dt (unit: mm) is the tire outer diameter. Thus, in the present invention, the narrow-width large-diameter pneumatic tire 1 is ...

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Abstract

According to the invention, the riding comfort performance, the noise performance and the operation stability performance are improved in a balanced manner. A pneumatic tire (1) includes a carcass (6). The carcass (6) is a carcass ply (6A) including a main body portion (6a) spanned between the bead cores (5) and a folded-back portion (6b) folded back around the bead cores (5) from the inside to the outside in the tire axial direction and extending to the outside in the tire radial direction. The bead section (4) is provided with a first apex (8A) disposed between the main body section (6a) andthe folded-back section (6b), and a second apex (8B) disposed on the outside of the folded-back section (6b) in the tire axial direction. The complex elastic modulus E * b of the second apex (8B) isgreater than the complex elastic modulus E * a of the first apex (8A).

Description

technical field [0001] The present invention relates to pneumatic tires. Background technique [0002] In recent years, improvements in fuel consumption performance have been desired for pneumatic tires. Patent Document 1 below discloses a so-called narrow-width large-diameter pneumatic tire in which the outer diameter of the tire is increased for the purpose of reducing the rolling resistance value and air resistance and the tire width is narrowed. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2015-33984 [0004] Generally, in a narrow-width large-diameter pneumatic tire, longitudinal elasticity increases due to a tendency to be filled with a high internal pressure. As a result, there is room for improvement in ride comfort performance and noise performance (road noise) in the above-mentioned pneumatic tire. [0005] In order to suppress the above-mentioned increase in longitudinal elasticity, for example, a method of reducing only the bead apex arranged in t...

Claims

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Application Information

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IPC IPC(8): B60C15/06
CPCB60C15/0607B60C15/0603B60C15/0063B60C3/04B60C15/06B60C2009/0276B60C2009/0284B60C2015/0614B60C2015/061B60C2015/0621
Inventor 西岛茂树
Owner SUMITOMO RUBBER IND LTD
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