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Pneumatic radial tire

A technology of radial tires and tires, applied to the reinforcement layer of pneumatic tires, tire parts, transportation and packaging, etc., can solve problems such as no public solutions

Active Publication Date: 2014-06-18
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent Documents 1 and 2 relate to tubed tires that improve the durability of the above-mentioned bead portions, but do not disclose the solution thereof.

Method used

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  • Pneumatic radial tire
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  • Pneumatic radial tire

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Experimental program
Comparison scheme
Effect test

Embodiment ）

[0069] Performance evaluation was performed to specifically show the structure and effect of the present invention. These evaluations were carried out using tires of size 11.00R20 in the manner shown in (1)-(3).

[0070] (1) Durability of the bead portion

[0071] The durability test was performed by running the tire on a drum until the bead portion failed. The size of the rim of the assembled tire is 8.00V, the diameter of the drum is 1700mm, the internal pressure of the tire is 830kPa, the load applied to the tire is 3350kgf (increased by 10% every 24 hours), and the driving speed is 25km / h. Index evaluation was performed with Comparative Example 2 as 100, and the larger the numerical value, the greater the traveling distance, which means that the durability of the bead portion is more excellent.

[0072] (2) Cord exposure outside the tire (rim wear resistance, abrasion resistance)

[0073] The tires in the above-mentioned durability test were evaluated in the following f...

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PUM

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Abstract

An object of the invention is to provide a tubed pneumatic radial tire having a highly durable bead portion. The solution is a tubed pneumatic radial tire having an inner tube (5) inserted into an inner side of the tire. The width (AW) from a reference point (RP) to the center (11c) of a bead core (11) and in a direction perpendicular to the equatorial plane of the tire, and the width (BW) from the reference point (RP) to the top (13) of a bead toe and in a direction perpendicular to the equatorial plane of the tire satisfy 0.40

Description

technical field [0001] The present invention relates to a pneumatic radial tire with an inner tube having a characteristic structure of a bead portion, and is particularly useful as a pneumatic radial tire for heavy loads. Background technique [0002] Conventionally, in pneumatic radial tires used for heavy vehicles such as trucks, failures such as separation starting from the wound end of the carcass wound around the bead core have sometimes occurred. The main reason for this is as follows: a large tension caused by the magnitude of the internal pressure acts on the carcass, and as the tire rotates under a load, the bead part is deformed in such a way that it falls to the outer side of the tire, so deformation occurs at the turn-up end of the carcass . [0003] Such as image 3 As shown, the inventors of the present invention have found through repeated studies that there is a difference in the shape of the bead portion or the rim between tires with a tube and a tubeless ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/02B60C9/04B60C9/16
Inventor 儿玉纪彦市川嘉之
Owner TOYO TIRE & RUBBER CO LTD