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Heavy Duty Tires

A technology for heavy loads and tires, applied to heavy tires, tire parts, tire treads/tread patterns, etc., can solve the problems of reduced traction performance and insufficient performance, and achieve the effects of improving drainage performance and stone inclusion resistance

Active Publication Date: 2017-11-17
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the heavy-duty tire disclosed in Patent Document 1, since the depth of the lateral groove after the middle stage of wear becomes insufficient due to the rib, the traction performance on uneven roads may be reduced.

Method used

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  • Heavy Duty Tires
  • Heavy Duty Tires
  • Heavy Duty Tires

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0097] Trial-produced based on the specifications in Table 1 figure 1 The basic structure in the heavy-duty tire with a size of 11.00R20 has been tested for stone inclusion resistance, wet road performance, wear resistance and uneven wear resistance. The test method is as follows.

[0098]

[0099] Under the conditions of a rim of 20×8.00 and an internal pressure of 780 kPa, each test tire was installed on the rear wheel of a truck (2-D vehicle) with a maximum load of 10 tons. The tires of the specifications of Example 1 are mounted on one rear wheel, and tires of various specifications are respectively mounted on the other rear wheel. The number of rubble that was caught in tires of various specifications at the end of the journey was measured until the tires of any of the rear wheels were worn by 50%. The result is the reciprocal of the number of crushed stones sandwiched in the tire of Example 1, and is expressed as an index with the value of Example 1 being 100. It is evalu...

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PUM

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Abstract

PROBLEM TO BE SOLVED: To provide a tire for a heavy load, which is improved in an anti-pebble biting performance at a groove intersecting part where a main groove and a lateral groove intersect.SOLUTION: A shoulder main groove 12 is alternately equipped with a long side part 12a and a short side part 12b inclined reversely of the long side part 12a and having a tire circumferential length shorter than that of the long side part 12a. A shoulder lateral groove 41 joints across the short side part 12b to the shoulder main groove 12. A first extension line 41e, which is extended from one groove edge of the shoulder lateral groove 41 to the side of the shoulder main groove 12, intersects the groove edge of the long side part 12a at a first intersection point CP1, and a second extension line 41f, which is extended from the other groove edge of the shoulder lateral groove 41 to the side of the shoulder main groove 12, intersects the groove edge of the long side part 12a at a second intersection point CP2. The ratio L2 / L1 of the distance L1 in the tire circumferential direction between the first intersection point CP1 and the second intersection point CP2 and the length L2 of the short side part 12b in the tire circumferential direction is 0.08 to 0.25.

Description

Technical field [0001] The present invention relates to a heavy-duty tire with improved stone-inclusion resistance. Background technique [0002] Except on paved roads, heavy-duty tires such as trucks that have more chances of driving on gravel roads mixed with more pebbles and uneven grounds, in order to ensure traction, the use of tires extending in the circumferential direction The main groove and the tread groove of the lateral groove in the direction intersecting the main groove divide the tread portion into a block pattern of a plurality of blocks. However, in such a block pattern in which the lateral grooves on both sides of the main groove are arranged staggered by 1 / 2 pitch in the tire circumferential direction, there is a tendency to cause stone inclusions at the groove intersections where the main groove and the lateral groove intersect in a T shape. problem. [0003] The stone trapping phenomenon is the following phenomenon: First, the gravel that is slightly wider th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/03
CPCB60C11/03B60C11/13B60C2011/0339B60C2200/06
Inventor 松田佳恵
Owner SUMITOMO RUBBER IND LTD