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Pneumatic tire

A technology for pneumatic tires and tires, applied in heavy tires, tire parts, tire treads/tread patterns, etc., can solve the problems of uneven wear, inability to combine snow performance and uneven wear resistance, etc. Improve snow traction, ensure snow traction, and the effect of proper content

Inactive Publication Date: 2010-03-31
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when such a pneumatic tire is used mounted on a steering shaft (steering shaft), uneven wear tends to occur at the tread shoulder portion located on the side in the tread width direction, starting from the sipe groove.
That is, snow performance and uneven wear resistance cannot be combined

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0096] Figure 6 It is a schematic diagram of the experimental results of the pneumatic tire performance of the embodiment of the present invention. Embodiments of the present invention will be described with reference to the drawings. The pneumatic tire of the embodiment described above was produced as a trial, and an evaluation test was performed on the performance of the pneumatic tire and the conventional pneumatic tire. The performance evaluation test was performed on two items of snow traction and uneven wear resistance. In this performance test, a pneumatic tire with a tire size of 295 / 80R22.5 having 4 grooves (4 main grooves) and a block-shaped central part of the tread was mounted on a specified rim defined in JATMA, and the tire was inflated A predetermined internal pressure and a predetermined load were applied to the tire, and the pneumatic tire was mounted on the front of a 2-D4 (two-wheel, dual-drive, four-wheel drive) test vehicle to carry out the test.

[00...

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PUM

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Abstract

A pneumatic tire that can achieve good on-snow performance and good wear resistant properties at the same time. In a tread pattern (9), the ratio of the maximum length in the tire's circumferential direction of each block (81), which forms block rows (11, 12) in a tread center section (21), to the maximum width in the tire's lateral direction of the block (81) is set in the range of not less than1.4 but not more than 1.9. The total groove area ratio of circumferential main grooves (6) in a ground contact surface and lateral grooves (7) also in the ground contact surface is set in the range of not more than 35%. The center groove area ratio of the tread center section (21) including circumferential main grooves (62) at the outermost positions in the lateral direction of the tire is set tobe not less than three times the shoulder groove area ratio of tread shoulder sections (22).

Description

technical field [0001] The invention relates to a pneumatic tire, in particular to a suitable pneumatic tire suitable for a block-based tread pattern. Background technique [0002] Among conventional pneumatic tires, there is a studless tire which has excellent snow traction performance due to the block-based tread pattern formed on the tread surface. Such a block tread pattern is divided into individual blocks of the tread by circumferential main grooves and widthwise grooves (so-called sipes). As a technique related to such a tread pattern that can improve snow performance, a pneumatic tire having tire equator lines arranged on the tread portion is disclosed in Patent Document 1 (Japanese Patent Laid-Open Publication No. 2006-232151). The central block group on the top and the second block group arranged in the tire circumferential direction on the outer side of the central block group in the tire width direction, and the central block group and the second block group pas...

Claims

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Application Information

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IPC IPC(8): B60C11/03B60C11/01B60C11/11B60C11/12
CPCB60C2011/1254B60C11/033B60C11/12B60C11/11B60C2200/06B60C11/0306
Inventor 石坂贵秀
Owner YOKOHAMA RUBBER CO LTD