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Heavy duty pneumatic tire

A technology for pneumatic tires and tires, which is applied to heavy-duty tires, tire parts, tire treads/tread patterns, etc. It can solve the problems of reduced rigidity of pattern blocks and wear of heels and toes, so as to prevent heels and toes from wear and tear. Effect of toe wear and chip wear, improvement of central wear resistance

Active Publication Date: 2012-09-26
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 pneumatic truck tire of Patent Document 1, the block rigidity of the shoulder block is relatively small, so that early wear of heel-toe wear tends to occur at the ends of the block in the circumferential direction on the first landing side and the rear landing side. The problem

Method used

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Experimental program
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Effect test

Embodiment

[0103] manufacturing form figure 1 The tires having the basic structure shown in Table 1, including the center land portion, middle land portion, and shoulder land portion, etc., were tested for their respective performances. Among them, the common specifications are as follows.

[0104] Tire size: 11.00R20

[0105] Rim Size: 20×8.00

[0106] Central main groove, middle main groove, shoulder main groove:

[0107] Groove width W1a, W1b, W1c: 6-9mm

[0108] Maximum groove depth D1a, D1b, D1c: 20.4mm

[0109] Gentle slope:

[0110] Angle α1a: 10 degrees

[0111] Length L1a: 45mm

[0112] Steep slope:

[0113] Angle α1b: 40 degrees

[0114] Length L1b: 5mm

[0115] The first and second inclined parts:

[0116] Angles α2a, α2b, α3a, α3b: 10 degrees

[0117] Length L2a, L2b, L3a, L3b: 22mm

[0118] Central transverse groove, middle transverse groove, shoulder transverse groove:

[0119] Angles α7a, α7b, α7c: 10 degrees

[0120] Groove width W7a, W7b, W7c: 5-20mm

[012...

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Abstract

The invention discloses a heavy duty pneumatic tire. Both of the center wear and heel-and-toe wear can be improved to high levels. A tread portion 2 is divided into a pair of crown land portions 4A, a pair of middle land portions 4B and a pair of shoulder land portions 4C by center main grooves 3A, middle main grooves 3B, and shoulder main grooves 3C. The crown land portions 4A, the middle land portions 4B and the shoulder land portions 4C are divided into crown blocks 8A, middle blocks 8B and shoulder blocks 8C by crown axial grooves 7A, middle axial grooves 7B and shoulder axial grooves 7C. The crown axial groove 7A, the middle axial groove 7B and the shoulder axial groove 7C are provided with a crown tie bar 16A, a middle tie bar 16B and a shoulder tie bar 16C, respectively. The maximum width Wcr of the crown land portion, the maximum width Wmi of the middle land portion, and the maximum width Wsh of the shoulder land portion are set in the preset range.

Description

technical field [0001] The present invention relates to a pneumatic truck tire capable of achieving both center wear resistance and heel-toe wear resistance at a high level. Background technique [0002] Pneumatic tires for trucks and buses are required to be able to run in all weathers and have high traction performance because tire replacement is very difficult. Therefore, in the tread portion of such a pneumatic truck tire, a block pattern divided into a plurality of blocks is widely used. [0003] However, in such a pneumatic truck tire, there is a problem of so-called center wear in which the center block with a large ground contact pressure is prone to relatively large wear. In order to prevent such center wear, the following Patent Document 1 is proposed. [0004] Patent Document 1: Japanese Unexamined Patent Publication No. 2007-22151 [0005] In the pneumatic truck tire of Patent Document 1, the block rigidity of the central block is relatively increased by adopt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/11
CPCB60C2011/0367B60C2011/1213B60C11/0306B60C11/1369B60C2011/0346B60C2011/0395B60C2011/0355B60C11/12B60C11/11B60C2200/06B60C11/01B60C11/04B60C11/13
Inventor 前原敦史
Owner SUMITOMO RUBBER IND LTD
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