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pneumatic tire

A technology for pneumatic tires and tire width directions, which is applied to tire parts, wheels, tire treads/tread patterns, etc., which can solve the problems of ground contact deterioration, partial wear, and insufficient edge effects, etc., to improve edge effects, The effect of improving braking performance

Active Publication Date: 2016-07-06
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the pneumatic tire of Patent Document 1, the zigzag shape of the peaks 21 and valleys 22 of the wave meander 31 extends to the meander bottom 18 even though the height of the lugs is low and the rigidity of the lugs is increased after the middle stage of wear.
As a result, the rigidity of the bump is extremely increased, and the moderate inversion of the bump does not occur, and the grounding performance is deteriorated, and the edge effect may become insufficient.
[0008] Also, when new, since the peaks 21 and valleys 22 of the zigzag extend obliquely from the tread surface 17, an acute-angled portion 32 is formed at the opening of the zigzag, so partial wear may also occur.

Method used

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Examples

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Embodiment

[0040] As an example, the pneumatic tire of the present invention and the pneumatic tire of the conventional example were tested and evaluated for their performance. Any 1 tire has figure 1 The tread pattern shown, the example has figure 2 The zigzag pattern shown in the conventional example has image 3 The zigzag pattern shown in . The depth D of any one meander is 7 mm, and in the embodiment, D1 is 5.5 mm, D2 is 1.5 mm, and A is 2 mm. The tire size is 195 / 65R15, mounted on a 2000ccFF van to evaluate the performance.

[0041] In Table 1, ice braking is the reciprocal of the ABS braking distance at 40 km / h on icy roads. The tires of the conventional example when they were new were expressed as an index of 100, and the larger the number, the better the performance. In addition, the term "abrasive" means when the tread is worn down to 60% of the depth D of the meander.

[0042] [Table 1]

[0043]

[0044] According to Table 1, the embodiment tires, because the...

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Abstract

In the pneumatic tire of the present invention, bumps are formed on the tread, and zigzags (11) are engraved on the bumps, and the zigzags (11) extend from the tread surface (17) to the zigzag bottom (18) in the depth direction. ) is divided into a surface part (12), a middle part (13), a bottom part (14), the surface part (12) and the bottom part (14) are opened into waves, and the wave-shaped mountain parts (21) and valley parts (22) are aligned with the tire The surface extends in a vertical direction, the middle part (13) opens into a wave form, and the wave-shaped mountain part (21) and valley part (22) extend zigzag. After the middle stage of wear, the rigidity of the bumps is moderately reduced, and a moderate inversion of the bumps occurs, so that the edge effect of the zigzag pattern can be fully exerted, and the braking performance can be improved.

Description

[0001] This application is a divisional application of the Chinese invention patent application No. 200510064921.5 filed on April 4, 2005 and entitled "Pneumatic Tire". technical field [0002] The present invention relates to a pneumatic tire with zigzags (Japanese: サイプ) engraved on bumps (Japanese: ブロック), and more specifically, to a pneumatic tire capable of ensuring ground contact performance after the middle stage of tire wear and improving tire performance. Background technique [0003] Pneumatic tires are usually provided with circumferential grooves and transverse grooves on the tread surface, and narrow zigzag grooves are also provided to improve drainage. In addition, in a non-strut tire intended for driving on icy and snowy roads, more zigzags are engraved, and the edge effect of the zigzags can be exerted to improve braking / driving performance and cornering performance. [0004] Generally, the rigidity of the bump is lowered by engraving the meander. When the num...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/113
CPCB60C11/12B60C11/1218B60C11/124B60C2011/1213B60C2011/1338Y10S152/03Y10S152/902Y10T152/10
Inventor 大桥稔之
Owner TOYO TIRE & RUBBER CO LTD
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