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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 uneven ground pressure and insufficient braking performance on ice surfaces, etc. Achieve uniform ground pressure, improve ice braking performance, and easily absorb deformation.

Inactive Publication Date: 2011-02-23
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in the case of forming a sipe having a wide portion as described above, it is known that, as Figure 11 Conceptually shown, the ground contact pressure of the kick-out side portion 61 of the sipe 6 becomes greater than the ground contact pressure of the step-in side portion 62, and the tread rubber tends to Under the condition of bending in the depth direction of the sipe, if a braking force is applied to the tire on an icy road, the ground contact pressure of the block 7 becomes uneven
Therefore, it cannot be said that ice braking performance (braking performance on icy roads) is sufficiently obtained, and it is known that there is room for further improvement of ice braking performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0027] figure 1 is a development plan view showing the tread of the pneumatic tire according to the first embodiment of the present invention. figure 2 A perspective view showing the main part of the block provided in the tread is shown in a partially broken way. image 3 It is a front view which shows the inner wall surface of the sipe formed in this block.

[0028] like figure 1 As shown, the pneumatic tire according to the present embodiment is provided with a tread pattern having a plurality of blocks 1 (an example of land portions) in which sipes 10 are shaped to extend linearly in the tire width direction. Each block 1 is partitioned by main grooves 2 extending in the tire circumferential direction and lug grooves 3 extending in the tire width direction, and 5 rows of blocks 1 are arranged symmetrically with respect to the tire equator C. In this case, the arrow R indicates the direction of rotation of the tire.

[0029] like figure 2 and 3 As shown, a pluralit...

no. 2 approach

[0043] Since the second embodiment has the same structure and effect as the first embodiment except for the following structure of the sipe, the differences will be mainly described and the common points will be omitted. In this case, the same reference numerals will be associated with the same components and positions as those already described, and repeated descriptions will be omitted.

[0044] Figure 4 is a perspective view showing, partially broken away, the main portion of a block provided in the tread of a pneumatic tire according to a second embodiment of the present invention. Figure 5 It is a front view which shows the inner wall surface of the sipe formed in this block. In the present embodiment, the wide portions 21 and 22 extending in the sipe length direction are formed on the kick-out side and the step-in side of the sipe 20, respectively, and the wide portions 21 and 22 are formed at the sipe depth Creates an undulating zigzag in the direction.

[0045] Th...

no. 3 approach

[0048] Since the third embodiment has the same structure and effect as the first embodiment except for the following structure of the sipe, the differences will be mainly described and the common points will be omitted. In this case, the same reference numerals will be associated with the same components and positions as those already described, and repeated descriptions will be omitted.

[0049] Image 6 is a perspective view showing the main part of the block according to the third embodiment of the present invention in a partially broken way. Figure 7 It is a front view which shows the inner wall surface of the sipe formed in this block. In the present embodiment, the wide portions 31 and 32 extending in the sipe length direction are formed on the kick-out side and the step-in side of the sipe 30, respectively, and the kick-out side wide portion 31 is formed at the sipe depth In a zigzag shape undulating in the direction, the step-in side wide portion 32 is formed in a s...

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Abstract

A sipe is formed in a block provided in a tread surface, wide portions extending in a sipe length direction are formed in each of a kick-out side and a step-in side of the sipe, and a total of heights of the wide portions in the kick-out side of the sipe is made larger than a total of heights of the wide portions in the step-in side of the sipe.

Description

technical field [0001] The present invention relates to a pneumatic tire having sipes formed in the ground contact portion of the tread, and is particularly useful for studless tires. Background technique [0002] In general, in a studless tire, a cut called a sipe is formed in a ground portion composed of a block, a rib, or the like, and based on the edge effect and drainage produced by the sipe The effect improves driving performance on icy roads with a low coefficient of friction. For the sipes described above, there are already linear sipes extending linearly in the longitudinal direction of the sipes, wave-like sipes extending in a wave-like manner, and the like in practical applications. [0003] In this case, since the rubber is incompressible, the movement of the tread in contact with the road surface becomes large when a load is applied to the tire, so that the opening portion of the sipe tends to close. In particular, since on a road surface with a low friction c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/12
CPCB60C11/1281B60C11/1218B60C11/12Y10S152/03
Inventor 大桥稔之
Owner TOYO TIRE & RUBBER CO LTD
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