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Pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve the problem of insufficient rigidity of the tread land portion, poor driving performance, and inability to fully improve handling stability. And other issues

Active Publication Date: 2016-04-06
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in such a tread pattern, the rigidity of the tread land portion is insufficient in the vicinity of the groove intersecting portion on the outer side where the groove width is large, so there is a possibility that the steering stability performance cannot be sufficiently improved.
[0007] On the other hand, in winter tires, if the groove volume of the tread portion is reduced in order to improve the steering stability, no large snow column will be formed, so there is a problem that the running performance on snow, especially on deep snow roads, will deteriorate. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0099] Based on the specifications in Tables 1 and 2, prototypes with figure 1 Pneumatic tires with a tread pattern size of 245 / 50R20 were tested for handling stability and driving performance on snow. The test method is as follows.

[0100]

[0101] The test tire installed on the rim of 20×7.5J under the condition of internal pressure of 250kPa is installed on all the tires of the car with the displacement of 3700cc, driving on the test route of dry asphalt road with one driver, at 80km / h In the speed range of ~120km / h, the driver's senses are used to evaluate the characteristics of the handiness and responsiveness of the steering. The results were rated with Comparative Example 1 as 100, and the larger the numerical value, the better the steering stability performance.

[0102]

[0103] The above-mentioned vehicle was driven on a snow-covered road, and the ease of starting, accelerating, and braking was evaluated by the driver's senses. The results were rated with Com...

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Abstract

A middle land portion (6) is divided into multiple middle blocks by first middle transverse grooves (10) and second middle transverse grooves (20) arranged alternately in the tire circumference direction. The first middle transverse grooves (10) include a first groove portion (11) which communicates with a crown main groove (3), and a second groove portion (12) which communicates with a shoulder main groove (4) and is less wide than the first groove portion (11); the second middle transverse grooves (20) include a third groove portion (23) which communicates with the shoulder main groove (4), and a fourth groove portion (24) which communicates with a crown main groove (3) and is less wide than the third groove portion (23). The middle land portion (6) has first middle slots (30) which are disposed near a second groove portion (12), extend from the shoulder main groove (4) towards the crown main groove (3) and end within the middle land portion (6), and second middle slots (40) which are disposed near fourth groove portions (24), extend from the crown main groove (3) towards the shoulder main groove (4) and end within the middle land portion (6).

Description

technical field [0001] The present invention relates to a pneumatic tire capable of realizing both handling stability performance and driving performance on snow. Background technique [0002] In the past, in the design of the tread pattern of pneumatic tires, in order to improve the handling stability, the groove volume of the tread portion was set to be small, and the rigidity of the land portion of the tread was increased to increase the cornering force, thereby realizing the steering application. Improvement of chirality and responsiveness. [0003] On the other hand, in winter tires, the snow on the road surface is compacted in the grooves of the tread portion to form a snow column, and the driving force on the snow is obtained by the reaction force when the snow column is sheared. Therefore, winter tires have a large groove volume in order to improve driving performance on snow. For example, winter tires increase the groove volume of lateral grooves extending in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/13B60C11/03B60C11/12
CPCB60C11/0306B60C11/1369B60C2011/0388B60C2011/0353B60C2011/1209B60C2011/0355B60C2011/0369B60C2011/0383B60C2011/0381B60C2011/0395B60C11/0309B60C11/0327B60C11/12B60C11/1315B60C2011/0334B60C2011/0341B60C2011/0365
Inventor 岩崎聪
Owner SUMITOMO RUBBER IND LTD
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