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Heavy load tire matrix durability evaluating method

An evaluation method and bead technology, which can be used in the direction of testing wear resistance, automobile tire testing, etc., and can solve the problems of tire puncture, cord breakage, and reduction of the strong force of the carcass cord.

Active Publication Date: 2014-07-02
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is a problem that the continuation of the wear caused by the fretting wear causes the strong force of the carcass cord to decrease, and eventually the cord breaks and even the tire blows out.
However, there is no effective test method that reproduces the fretting wear of the bead portion in a short test time to accurately evaluate the durability of the carcass in a short test time, and the emergence of such a test method is strongly demanded.

Method used

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  • Heavy load tire matrix durability evaluating method
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  • Heavy load tire matrix durability evaluating method

Examples

Experimental program
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Effect test

Embodiment

[0072] In order to confirm the effect of the present invention, the figure 2 A commercially available heavy-duty tire (12.00R20-16PR) having the structure shown was used as a test tire, and an evaluation test of carcass durability was performed under the criteria shown in Table 1. In addition, the test was performed on 10 tires under each condition, and the average value of the fretting wear amount and the deviation σ of the fretting wear amount were compared.

[0073] The normal internal pressure P0 of the test tire is 7.25kPa, and the normal load F 0 is 30.5kN. The amount of fretting wear is the wear volume of the worn part of the carcass cord at the innermost point in the tire axial direction of the bead core measured with a laser microscope, and the average value of the amount of fretting wear in Comparative Example 1 is taken as 100. index to represent its mean. The larger the value, the faster the abrasion progresses.

[0074] Table 1:

[0075]

[0076]

[00...

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Abstract

The invention provides a heavy load tire matrix durability evaluating method which includes the test procedure and the evaluating procedure for heavy load tire matrix durability. In the driving test procedure, the inner pressure of P is 160 -260% of a normal inner pressure and the load F is 350 F0 -450% of a normal load; the running speed is 15 -40km / h, and the tested tires running on pre-set twisted roads in a twisting state. The flexural state is that when the width point tire axial direction in the tire axial direction through the bead core most interior point and carcass of the X with respect to the tire axis line is set as angle theta. The point of pressure tire in normal within the theta value theta 0 and running process of tire in the angle theta value difference (theta 1) is in the range of 5 -15 degrees of deflection state. As a result, an evaluating of heavy load tire matrix durability can be realized in a short time.

Description

technical field [0001] The present invention relates to a heavy-duty tire capable of reproducing damage to carcass cords caused by friction with bead cores in a short test time and capable of evaluating carcass durability with high accuracy in a short test time Method for evaluating carcass durability of bead portion. Background technique [0002] Such as Figure 6 As shown, a bead core b is arranged on the bead portion a of the heavy-duty tire. The bead core b is formed by winding steel wires in multiple rows and segments, and its cross section is polygonal, usually hexagonal. In addition, both end portions of the carcass ply c constituting the frame of the tire are locked by being folded around the bead core b. [0003] However, since the heavy-duty tire is used under severe conditions of high internal pressure and high load, a large tension f acts on the carcass cords of the carcass ply c. As a result, so-called fretting occurs on the carcass cord. rub against each oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/02G01N3/56
Inventor 李庆茂
Owner SUMITOMO RUBBER IND LTD
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