Pneumatic tire

A technology for pneumatic tires and treads, applied in tire parts, tire treads/tread patterns, transportation and packaging, etc., can solve problems such as poor steering performance, poor handling stability, and reduced block rigidity. To achieve the effect of improving starting and braking

Inactive Publication Date: 2007-05-16
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when the sipe length is increased, the rigidity of the block decreases, and the handling stability on snowy and dry roads deteriorates, especially the steering performance deteriorates.

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] In each of Example 1, Comparative Example 1, and Comparative Example 2, the following sipe patterns were formed on the tread surface of a pneumatic tire having a tire size of 205 / 60R1591T.

[0057] Example 1 is the shape of the sipe shown in FIG. 1, and the total length of the sipe on the tread surface of the block 11 in the tread end region, the number of the sipe and the rigidity index of the sipe (F) The total length of the sipe on the tread surface, the number of sipes and the rigidity index (F) of the sipe are respectively greater than that of the block 12 in the tread central region.

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PUM

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Abstract

A pneumatic tire has, on its tread (10), block rows (11, 12) partitioned by circumferential main grooves (14) extending in the circumferential direction of the tire and by lateral grooves (16) intersecting the circumferential main grooves. The blocks (11) in tread end regions each have two zigzag sipes (11a), and the blocks (12) in a tread center region each have one zigzag sipe (12a). The total length, the number of sipes, and a sipe rigidity index (F) of sipes that one block has on the tread surface are greater in the tread end region blocks (11) than in the tread center region blocks (12).

Description

technical field [0001] The present invention relates to a pneumatic tire having block rows on a tread. Background technique [0002] Conventionally, it is known that in winter tires (snow tires) or all-season tires (all-season tires), the performance on snow is improved by increasing the total length of the sipes in blocks in the tread end region. Starting and braking. For example, there has been disclosed a technique for improving braking performance by forming a wave-shaped sipe by making the concavo-convex row of the inner wall surface of the sipe continuous with a surface inclined with respect to the normal direction of the block landing surface (e.g. , with reference to Japanese Patent Application Laid-Open No. 2002-321509). [0003] However, when the sipe length is increased, the rigidity of the block decreases, and the steering stability on snowy or dry roads deteriorates, especially the steering performance deteriorates. [0004] Therefore, in view of the above-me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/12B60C11/11
CPCB60C11/11B60C2011/1213B60C11/12B60C2011/1227B60C11/1218
Inventor 坂卷雄二
Owner BRIDGESTONE CORP
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