pneumatic tire

A technology for pneumatic tires and tires, which is applied to off-road vehicle tires, tire parts, tire treads/tread patterns, etc., which can solve problems such as difficulty in ensuring wear resistance and decreased rigidity, and achieve improved driving performance and traction sexual effect

Active Publication Date: 2022-04-19
THE 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 the followability to the road surface. Therefore, there is a problem that the block rigidity is lowered, and it is difficult to ensure wear resistance and steering stability when driving on ordinary paved roads, and it is difficult to achieve a high degree of balance between these performances.

Method used

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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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Abstract

To provide a pneumatic tire which is suitable as a tire for running on unpaved roads and has improved running performance on unpaved roads, wear resistance, and handling stability. In the tread portion (1), there are shoulder blocks (13s), intermediate blocks (13m) divided by multiple longitudinal grooves (11) extending along the tire ), the respective treads of the central block (13c) form shallow grooves (20) whose groove depth is smaller than that of the longitudinal grooves (11) and transverse grooves (12), so that the shallow grooves (20) extend along the tire width direction , and make at least one end communicate with the longitudinal groove (11) or the transverse groove (12), set at least one bending point (P) on the contour line of the shallow groove (20), and set it on the flat bottom surface of the shallow groove (20) The sipe (30) extending along the shallow groove (20) in which the central shallow groove (21) formed in the central block (13c) is provided with a terminal portion terminating in the central block (13c) (T).

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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Patent Type & Authority Patents(China)
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 THE YOKOHAMA RUBBER CO LTD
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