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Pneumatic tire

A technology of pneumatic tires and tires, which is applied to tire parts, tire tread/tread pattern, transportation and packaging, etc., to achieve the effects of suppressing collapse, maintaining dry road performance, and improving ice performance

Active Publication Date: 2015-01-14
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, even with such a pneumatic tire, there is still room for further improvement in terms of taking into account dry road performance, snow performance and ice performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0082] Based on the specifications in Table 1, a heavy-duty pneumatic tire with a size of 11R22.5 was trial-produced. The dry road performance, snow performance, ice performance and wear resistance performance of each trial tire were tested. The general specifications and test methods of each tire are as follows.

[0083] Mounting rim: 8.25×22.5

[0084] Tire internal pressure: 900kPa

[0085] Test vehicle: 10t truck loaded with 50% of the standard load in the center of the loading deck

[0086] Tire installation position: all wheels

[0087]

[0088] The running performance on a dry asphalt road surface of the test vehicle mounted with each test tire was evaluated by the driver's senses. The results are shown as evaluations with Comparative Example 1 set to 100, and the larger the numerical value, the better the dry road performance.

[0089]

[0090] The running performance on icy roads of the test vehicle mounted with each test tire was evaluated by the driver's se...

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Abstract

A pneumatic tire is provided with a center land portion (10) between two zigzag crown main grooves (3), and two middle land portions (20) between two zigzag shoulder main grooves (4) and the two crown main grooves (3); each center block (11) is provided with center sipes (13) between which a central part defining the maximum width of the center block (11) is formed; the middle land portion is divided into middle blocks (21) by alternate, oppositely inclined first middle axial grooves (24) and second middle axial grooves (25); each middle block (21) is provided with nonparallel middle sipes (23)

Description

technical field [0001] The present invention relates to a pneumatic tire capable of improving ice performance while maintaining dry road performance and snow performance. Background technique [0002] Conventionally, in order to improve frictional force on icy roads, for example, a pneumatic tire has been proposed in which sipes are provided on blocks provided on a tread portion. This pneumatic tire uses the edge effect of the sipes to improve traction on icy roads. [0003] However, since the rigidity of the blocks provided with the sipes decreases, there is a problem that dry road performance and on-snow performance deteriorate. [0004] For example, Patent Documents 1 and 2 below propose pneumatic tires that improve ice performance while maintaining dry performance and snow performance by improving sipe length, lateral edge length, or block arrangement. [0005] Patent Document 1: Japanese Patent Laid-Open No. 2009-190677 [0006] Patent Document 2: Japanese Patent Lai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/12
CPCB60C2011/1213B60C11/0304B60C2011/036B60C11/125B60C11/1236B60C2011/0348B60C2011/0346B60C2011/0372B60C2011/0358B60C2011/0362B60C11/0306B60C11/04B60C11/11B60C11/12B60C11/13
Inventor 田中聪
Owner SUMITOMO RUBBER IND LTD