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Heavy duty pneumatic tire

A pneumatic tire and heavy-duty technology, which is applied in the field of heavy-duty pneumatic tires, can solve problems such as uneven wear of pattern blocks, and achieve the effects of suppressing uneven wear, improving performance on ice, and excellent performance on ice

Active Publication Date: 2016-06-22
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such an open sipe tends to cause uneven wear of the block when it is provided on the outer block sheet of the middle block that often acts on a relatively large ground contact pressure.

Method used

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  • Heavy duty pneumatic tire
  • Heavy duty pneumatic tire
  • Heavy duty pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0090] Prototype has figure 1 The basic pattern size is 11R22.5 heavy-duty pneumatic tires. As Comparative Example 1, such as Figure 9 As shown, a tire in which an open sipe with one end communicating with the middle lateral groove is provided on the middle block is trial-produced. The performance on ice and wear resistance of each test tire were tested. Common specifications and test methods for each test tire are as follows.

[0091] Mounting rim: 8.25×22.5

[0092] Tire internal pressure: 900kPa

[0093] Test vehicle: truck (10t), load 50% of the standard load in the center of the container

[0094] Tire installation position: all wheels

[0095]

[0096] The driving performance on ice of the above-mentioned test vehicles was evaluated according to the driver's senses. The results were scored with Example 1 as 100, and the larger the numerical value, the better the on-ice performance.

[0097]

[0098] The amount of wear of the shoulder blocks after running for...

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Abstract

The invention provides a heavy duty pneumatic tire which can play excellent on-ice performance and the wear-resisting property. A tread portion 2 is divided into shoulder land regions 11 and middle land regions 10. The shoulder land regions 11 comprise shoulder pattern blocks 40. The middle land regions 10 comprise middle pattern blocks 16. At least one of the shoulder pattern blocks 40 and at least one of the middle pattern blocks 16 are each divided by two splitting sipes 25 into a central pattern block piece 30 and outside pattern block pieces 31 on both sides thereof. Each outside pattern block piece 31 of the middle pattern blocks 16 is provided with a closed sipe 33. Each outside pattern block piece 31 of the shoulder pattern blocks 40 is provided with an open sipe 45.

Description

technical field [0001] The present invention relates to a heavy-duty pneumatic tire capable of exhibiting excellent on-ice performance and wear resistance. Background technique [0002] Patent Document 1 below proposes a heavy-duty pneumatic tire in which blocks divided into a plurality of block sheets are provided on a tread portion. The blocks of the pneumatic tire of Patent Document 1 are divided into a central block piece and a pair of outer block pieces located on both sides in the tire circumferential direction of the central block piece by two dividing sipes extending in the tire axial direction. Each block piece flexibly deforms when it comes into contact with the road surface, and the edge portion of each block piece catches the road surface, thus improving the frictional force on ice. [0003] However, the pneumatic tire of Patent Document 1 is provided with an open sipe at least one end of which is opened at the edge of the block in each outer block sheet. Such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/12
CPCB60C11/11B60C11/125B60C2011/0344B60C2011/0346B60C2011/0348B60C2011/0353B60C2011/1213B60C2011/1254B60C2200/06B60C11/03B60C11/12B60C11/1236B60C2011/0337
Inventor 轰大辅
Owner SUMITOMO RUBBER IND LTD
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