Heavy duty tire

A technology for heavy-duty tires, applied to heavy-duty tires, tire parts, reinforcement layers of pneumatic tires, etc., can solve the problems of uneven wear on the edge and uneven wear on the tread surface, and achieve uniform sliding and uneven suppression wear effect

Inactive Publication Date: 2015-06-24
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, such tires have a problem that uneven wear tends to occur on the tread portion.
Especially in such tires, there is a problem that uneven wear tends to occur at the edges on both sides of the shoulder main groove.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0093] Based on the specifications in Table 1, a trial-manufactured form figure 1 The basic structure of figure 2 The basic pattern is a heavy-duty tire of size 11R22.5. The wet performance and uneven wear resistance of each test tire were tested. Common specifications and test methods for each test tire are as follows.

[0094] Mounting rim: 7.50×22.5

[0095] Tire internal pressure: 800kPa

[0096] Test vehicle: 10t truck

[0097] Tire installation position: all wheels

[0098]

[0099] The above-mentioned test vehicle drove into a wet asphalt road with a water film of 2 mm thickness at a speed of 65 km / h, and braked suddenly. At this time, the deceleration time of the test vehicle from 60 km / h to 20 km / h was measured. The result is an index with the value of Comparative Example 1 being 100, and the smaller the value, the shorter the deceleration time and the better the wet performance.

[0100]

[0101] The above-mentioned test vehicle was driven for 10,000 km ...

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PUM

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Abstract

Heavy duty tire, wherein a distance t1 from the radially outer surface of a belt layer (7) to the tire's inner surface is 15 to 23 mm when measured along a tire radial direction line (13) passing through the bottom of a shoulder main groove (12); the width of the shoulder main groove (12) is more than the width of a center main groove (11); the ratio Wc: Wm: Ws of the average width Wc of a center land portion (20), the average width wm of a middle land portion (30), and the average width Ws of a shoulder land portion (40) is 1.00 : 1.00 to 1.08: 1.03 to 1.13; the middle land portion (30) is provided with a plurality of middle axial grooves (31); the shoulder land portion (40) is provided with a plurality of shoulder axial grooves (41); the width of the shoulder axial groove (41) is more than the width of the middle axial groove (31); the angle ¸s of the shoulder axial groove (41) is more than the angle ¸m of the middle axial groove (31) with respect to the tire axial direction.

Description

technical field [0001] The present invention relates to a heavy-duty tire that maintains wet performance and improves uneven wear resistance. Background technique [0002] Conventionally, there has been proposed a heavy-duty tire in which a tread portion is provided with a plurality of blocks divided by main grooves extending in the tire circumferential direction and lateral grooves extending in the tire axial direction (for example, Patent Document 1 below). . Such a tire effectively improves the wet performance through the main groove and the lateral groove. [0003] However, such tires have a problem that uneven wear tends to occur on the tread portion. In particular, such a tire has a problem that uneven wear tends to occur at the edge edges on both sides of the shoulder main groove. [0004] Patent Document 1: International Publication No. WO2010 / 055659 [0005] As a result of intensive research, the inventors found that by determining the distance from the outer su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/11
CPCB60C2200/06B60C11/0306B60C2011/0388B60C2011/0346B60C2011/0365B60C2011/0033B60C2011/0372B60C9/1835B60C11/04
Inventor 轰大辅
Owner SUMITOMO RUBBER IND LTD
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