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Pneumatic tires

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

Active Publication Date: 2018-04-17
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in 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 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 on the 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 Co...

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Abstract

An inflatable tire in which the middle land part (6) is divided into multiple intermediate pattern blocks by the 1st intermediate horizontal groove (10) and the 2nd intermediate horizontal groove (20) alternating along the rotation of the tire. The 1st median transverse groove (10) includes the 1st sulcus (11) connected to the main cusp of the fetal crown (3) and the 2nd sulcus (12) connected to the main sulcus of the fetal shoulder (4) and the width of the gully is smaller than the 1st sulcus (11), the 2nd intermediate transverse sulcus (20) comprises the 3rd sulcus (23) connected to the main sulcus of the fetal shoulder (4) and the 4th sulcus (24) of the cullum main sulcus (3) and the width of the groove is smaller than the 3rd sulcus (23). The middle land part (6) has: the 1st intermediate groove (30), which extends from the main groove of the shoulder (4) towards the main groove of the fetal crown (3) near the second groove (12) and terminates within the middle land part (6); and the 2nd intermediate groove (40), which, near the 4th groove (24), extends from the crown main groove (3) towards the shoulder main groove (4) and terminates within the middle land part (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 Patents(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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