Heavy Load Tyre

A technology for heavy loads and tires, which is applied to tire parts, tire edges, transportation and packaging, etc., and can solve problems such as tire delamination

Active Publication Date: 2017-01-04
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the tire of Patent Document 1, when the bead portion bends and deforms outward in the tire axial direction, stress concentrates on the end of the second steel cord layer, and damage such as tire delamination occurs at the end. Propensity
Therefore, there is room for further improvement regarding the improvement of the durability of the bead portion in the prior art.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0073] Based on the specifications in Table 1, manufactured with figure 1 The basic structure of figure 2 , Figure 4 or Figure 5 The size of the bead part is 12.00R20 for heavy duty tires. As a comparative example, manufacture such as Figure 6 Shown is a heavy duty tire having a bead portion provided with only the first reinforcing portion. The durability of the bead portion of each test tire was tested. Common specifications and test methods for each test tire are as follows.

[0074] Install the rim: 20×8.50V

[0075] Tire internal pressure: 850kPa

[0076]

[0077] The above-mentioned test tires were run on a roller testing machine under the following conditions, and the running distance before the bead portion was damaged was measured. As a result, the value of Comparative Example 1 was assumed to be 100, and the larger the value, the better the durability of the bead portion.

[0078] Speed: 20km / h

[0079] Longitudinal load: 73.46KN

[0080] Test results...

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PUM

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Abstract

The present invention provides a heavy load tyre capable of improving the durability of a tyre bead part. The heavy load tyre is equipped with a tyre 6 made of a tyre body cord fabric 6A, and the tyre body cord fabric 6A comprises a main body part 6a and a return part 6b. The tyre bead part 4 is equipped with a first reinforcing part 11 located at the side of the main body part 6a and a second reinforcing part 12 located at the side of the return part 6b, the first reinforcing part 11 comprises a first steel wire cord fabric layer 21 and a second first steel wire cord fabric layer 22 of which the cross-section is roughly U-shaped, and the second reinforcing part 12 comprises a first organic fiber cord fabric layer 31 covering the outer end at the side of the return part 6b of the second steel wire cord fabric layer from the axial outer side of the tyre and a second organic fiber cord fabric layer 32.

Description

technical field [0001] The present invention relates to a heavy-duty tire capable of improving the durability of bead portions. Background technique [0002] For example, Patent Document 1 below proposes a heavy-duty tire in which a reinforcing portion is provided in a bead portion. The reinforcing portion of Patent Document 1 includes: a first steel cord layer extending in the radial direction of the tire on the main body portion side of the carcass ply; Two steel cord layers. [0003] However, in the tire of Patent Document 1, when the bead portion bends and deforms outward in the tire axial direction, stress concentrates on the end of the second steel cord layer, and damage such as tire delamination occurs at the end. Propensity. Therefore, there is room for further improvement regarding the improvement of the durability of the bead portion in the prior art. [0004] prior art literature [0005] patent documents [0006] Patent Document 1: Japanese Patent Laid-Open...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C15/00B60C15/06
CPCB60C15/00B60C15/06
Inventor 李庆茂
Owner SUMITOMO RUBBER IND LTD
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