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Heavy duty pneumatic tire

A technology for pneumatic tires and tires, which is applied to tire parts, tire treads/tread patterns, transportation and packaging, etc. It can solve problems such as peeling, uneven rubber layer exposure, and damage to wet performance, and achieves good groove arrangement , Improving traction performance and driving stability, the effect of improving traction performance

Inactive Publication Date: 2006-06-07
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a technique brings about the problem that the rubber layer with high friction is exposed unevenly due to partial wear.
This in turn impairs wet performance and strips the inner layer in the rubber layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0205] The manufacturing size is 11R22.5 and has figure 1 The heavy-duty pneumatic tire with the tread pattern shown (Table 1), and the corresponding performance was evaluated. The evaluation results are shown in Table 3. In this regard, the r coefficients are listed in Table 2.

[0206] The various test conditions shown in Table 1 are as follows. In each test, the rim size is 7.50×22.5, the internal pressure is 800kPa, and the vehicle used is a 10-ton 2-D vehicle with a daily capacity of 10 tons (half-load loaded on the front half of the carriage).

[0207] (1) Wetland rotation performance

[0208] Location: Okayama test track of Sumitomo Rubber Industries, Ltd.

[0209] Method: The time to run one lap on a track with a radius of 30 meters in the wetland state is expressed as the reciprocal of the ratio with respect to Comparative Example 1. The value of Comparative Example 1 is defined as 100, and the larger the value, the more advantageous.

[0210] (2) Wetland traction perform...

Embodiment approach 2

[0229] The manufacturing size is 11R22.5 and has figure 1 A heavy-duty pneumatic tire with the tread pattern shown and the corresponding performance evaluated. The evaluation results are shown in Table 4. The various test conditions shown in Table 4 are as follows. In each test, the rim size is 7.50×22.5, the internal pressure is 800kPa, and the vehicle used is a 10-ton 2-D4 vehicle (the half-load is loaded on the front half of the carriage).

[0230] (1) Wet grip performance

[0231] Location: Okayama test track of Sumitomo Rubber Industries, Ltd.

[0232] Method: The time to run one lap on a track with a radius of 30 meters in the wetland state is expressed as the reciprocal of the ratio relative to Comparative Example 1. The value of Comparative Example 1 is defined as 100, and the larger the value, the more advantageous.

[0233] (2) Partial wear resistance

[0234] Driving distance: 40,000km

[0235] Evaluation method: Under a constant load (10t) load condition, a 2-D4 box t...

Embodiment approach 3

[0239] According to the specifications in Table 5, the size is 11R22.5 and has figure 1 The heavy-duty pneumatic tire with the tread pattern shown, and the snow performance and wet performance of the tires of the examples were evaluated in the new product state, the 50% wear state, and the 90% wear state. The results are shown in Table 5.

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Abstract

An object of the present invention is to provide a heavy-duty pneumatic tire which has a block pattern and which is capable of improving uneven wear resistance without sacrificing wet grip performance or snow performance, and which is well suited for use in various seasons. The present invention includes block patterns employing at least three types of blocks including: a central block separated by a central longitudinal groove, a middle longitudinal groove, and a central transverse groove, a central block separated by a middle longitudinal groove, an outer a middle block (4M) divided by longitudinal grooves and intermediate transverse grooves, and an outer block divided by outer longitudinal grooves, outer transverse grooves (3S) extending from the outer longitudinal grooves to the ends of the tread, Among them, the aspect ratio of the block, the groove width ratio of the longitudinal groove and the transverse groove, the maximum width of the block, the minimum width of the block and its ratio, and the circumferential edge composition and tire axial edge composition at each wear stage and its ratio are limited within a specific range.

Description

Technical field [0001] The present invention relates to a heavy-duty pneumatic tire with improved uneven wear resistance performance by improving the tread pattern. Background technique [0002] It is desirable to adopt tires that can be used in all seasons as heavy-duty pneumatic tires for heavy-duty vehicles such as trucks and buses. In order to achieve the purpose of safe driving on a variety of road conditions, such all-weather heavy-duty pneumatic tires need to maintain high wet grip performance and driving stability. For this reason, block patterns are mainly used as tread patterns in most cases. [0003] On the other hand, for tires with block patterns, especially heavy-duty pneumatic tires, when driving or braking, a large shear force acts on the first contact side and the last contact side in the rotation direction, and is generated between the tire and the road surface. Sliding friction. Therefore, the so-called heel / toe wear (referred to as H / T wear) is prone to occur,...

Claims

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Application Information

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IPC IPC(8): B60C11/11
CPCB60C11/1369
Inventor 高桥伸吾津田训
Owner SUMITOMO RUBBER IND LTD
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