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Pneumatic tire

By arranging longitudinal grooves, transverse grooves and sipes on the tread of the tire, and configuring convex and concave structures in the sipes, the problem of the tread blocks at the circumferential end of the tire being easily skewed is solved, and the ice braking performance and edge are improved. Effect.

Inactive Publication Date: 2012-02-08
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after increasing the number of sipes and increasing the density of sipes, although the number of edges increases, the overall rigidity of the pattern block will decrease, and the braking performance on ice will also decrease.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0031] Such as figure 1 , figure 2 As shown, the tread portion 10 is provided with a plurality of blocks 16 which are formed by a plurality of longitudinal grooves 12 extending in the tire circumferential direction and transverse grooves 14 extending in a direction crossing the tire circumferential direction.

[0032] On the tread 10A of the block 16, a plurality of sipes 18 extending in a direction crossing the tire circumferential direction are provided at intervals along the tire circumferential direction.

[0033] At the position of the block 16 at the end of the tire in the circumferential direction, there is a block 16 partial 16A divided (sandwiched) by a sipe 18 and a lateral groove 14 having a width larger than the sipe 18.

[0034] In addition, at the position of the block 16 other than the tire circumferential end portion, there is a block 16 part 16B divided (sandwiched) by adjacent sipes 18.

[0035] In order to effectively exert the edge effect, the width W of the sipe 1...

example 1

[0053] Will have figure 1 (A), image 3 The 215 / 60R16 radial studless tire with the convex part 22 and the concave part 24 meshing with the convex part 22 is installed on a 16×7J rim with an internal tire pressure of 200kPa, and then installed to a 2000cc On the four wheels of the RV car, the dry braking, wet braking, and ice braking of the conventional example and examples 1, 2, 3, and 4 were tested.

[0054] In addition, the width W of the sipe 18 is set to 0.4 mm, the depth D is set to 6 mm, and the length L is set to 10 mm.

[0055] The dry braking test is to brake on a dry asphalt road at a speed of 100Km / h, measure the braking distance, and use the reciprocal of the braking distance to evaluate the index with a conventional example of 100. The higher the value Larger means better braking performance.

[0056] The wet braking test is to brake on a wet asphalt road at a speed of 60Km / h, measure the braking distance, and use the reciprocal of the braking distance, taking the conv...

no. 2 Embodiment

[0061] In the second embodiment, similar to the first embodiment, on the tread 10A of the block 16 partitioned by the longitudinal grooves 12 and the lateral grooves 14, a plurality of blocks are provided at intervals in the tire width direction along the tire circumferential direction. The extended sipe 18 is provided with a convex portion 22 and a concave portion 24 on the sipe wall surface 1804 facing each other in the sipe 18 to engage with each other and suppress local skew of the block 16.

[0062] In addition, the part 16A of the block 16 located at the circumferential end of the tire is divided by the sipe 18 and the transverse groove 14 whose width is larger than the sipe 18, so it is easier than the part 16B of the block 16 which is divided by the adjacent sipe 18 and located in other parts. The skew is the same as in the first embodiment.

[0063] In the second embodiment, such as Figure 4 , Figure 5 As shown, the cross-sectional area of ​​the convex 22, the cross-sect...

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PUM

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Abstract

The aim of the invention is to provide a pneumatic tire, capable of suppressing collapsing on parts of decorative blocks positioned at an end part of a tire circumference, in favor of increasing brake performance of an ice ground. A plurality of decorative blocks are arranged on a tire face part and a plurality of sipes are arranged in the tire face part of the decorative blocks. In the sipes, protrusions are formed on a first sipe wall surface of mutually opposing sipe wall surfaces and recesses that engage with the protrusions are formed on a second sipe wall surface. Collapsing of the portions of the blocks sandwiched by the sipes is suppressed due to the engaging of the protrusions and the recesses. A height H1 of the protrusions provided on the sipe wall surfaces of the sipes located at the edges in the tire circumferential direction is greater than a height H2 of the protrusions provided on the sipe wall surfaces of the other sipes. Specifically, a force that works to suppress bending deformation increases and collapsing of the portions of the blocks located at the edges in the tire circumferential direction is suppressed.

Description

Technical field [0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire that can improve the braking performance of the tire on ice. Background technique [0002] In order to improve the braking performance of studless tires on ice, there is known a tread pattern in which a plurality of sipes are arranged in the tire pattern. Moreover, the number of sipes has been increasing in recent years. However, after increasing the number of sipes and increasing the density of sipes, although the number of edges increases, the overall rigidity of the block will decrease, and the braking performance on ice will also decrease. [0003] Therefore, a proposal has been proposed to suppress local skew of the block sandwiched by the sipe by arranging uneven portions in the sipe, thereby suppressing the decrease in block rigidity (Patent Document 1). [0004] Prior art literature [0005] Patent literature [0006] [Patent Document 1] Japanese Patent No. 318...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/12
CPCB60C11/12B60C11/1218B60C2011/1213B60C11/11B60C1/00B60C11/0306
Owner THE YOKOHAMA RUBBER CO LTD