Pneumatic tire

A technology of pneumatic tires and tires, applied in off-road vehicle tires, tire parts, tire treads/tread patterns, etc., can solve the problems of decreased rigidity, difficulty in ensuring wear resistance, etc., to improve driving performance and traction. sexual effect

Active Publication Date: 2020-03-24
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, especially in the case of intending to drive on rocky ground, the groove area is set to be large for the purpose of sufficiently biting into mud and the like (especially stones and rocks) to obtain traction, or to increase the edge components. The sipe is provided to improve t

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0038] Made a tire size 35×12.50R17 with figure 1 The basic structure of the example and the figure 2 The tread pattern is the keynote and the presence or absence of shallow grooves, the depth of shallow grooves, the number of inflection points of shallow grooves provided at each block, the presence or absence of sipe patterns at the bottom of shallow grooves, and the presence or absence of shallow grooves in the center The presence or absence of the end portion of the groove and the number of the end portion of the central shallow groove were set as shown in Table 1 for 12 pneumatic tires of Comparative Examples 1 to 4 and Examples 1 to 8, respectively.

[0039] In addition, Comparative Example 1 is an example without shallow grooves and sipes, and is obtained from figure 2 The shape of the tread pattern after removing the shallow grooves and sipes in each part. Comparative example 2 is based on figure 2 The tread pattern is the keynote and the outline of the shallow gr...

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PUM

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Abstract

Provided is a pneumatic tire suitable for traveling on an unpaved road, the pneumatic tire being improved in running performance, abrasion resistance performance and steering stability performance onan unpaved road. In a tread portion 1, on each tread surface of a shoulder block 13s, an intermediate block 13m, and a center block 13c, which are defined by a plurality of longitudinal grooves 11 extending in the tire circumferential direction and a plurality of lateral grooves 12 extending in the tire width direction, a shallow groove 20 having a groove depth smaller than that of the longitudinal groove 11 and the lateral groove 12 is formed. The shallow groove 20 extends along the tire width direction and at least one end thereof is communicated with the longitudinal groove 11 or the lateral groove 12. At least one bending point P is provided on the contour line of the shallow groove 20. A sipe 30 extending along the shallow groove 20 is provided on the flat bottom surface of the shallow groove 20. A terminal end portion T terminating in the center block 13c is provided in the center shallow groove 21, of the shallow groove 20, which is formed in the center block 13c.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable as a tire for running on unpaved roads, and more specifically, to a pneumatic tire having improved running performance on unpaved roads while maintaining wear resistance and steering stability on paved roads. Background technique [0002] In the pneumatic tires used for driving on uneven ground, muddy ground, snow track, sandy ground, rocky ground and other unpaved roads, horizontal grooves (Japanese: rag grooves) and blocks with many edge components are generally used. Large tread pattern. In such tires, the traction performance is obtained by biting into mud, snow, sand, stones, rocks, etc. on the road surface (hereinafter, they are collectively referred to as "mud, etc."), and prevents mud, etc. from clogging in the grooves, thereby improving The driving performance on unpaved roads has been improved (for example, refer to Patent Document 1). [0003] However, especially in the case of int...

Claims

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Application Information

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IPC IPC(8): B60C11/12B60C11/03B60C11/13
CPCB60C2011/0351B60C2011/0381B60C2011/0383B60C2200/14B60C11/0306B60C11/125B60C11/12B60C11/1307B60C2011/0346B60C2011/133B60C2011/1213
Inventor 堀内研治
Owner YOKOHAMA RUBBER CO LTD
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