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Pneumatic tire

A technology of pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve the problems of not considering cornering grounding, initial drainage and wear resistance, etc.

Active Publication Date: 2020-07-07
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned conventional pneumatic tires only have a structure that facilitates the distinction between all-season tires and summer tires, and do not consider the ground contact performance during cornering.
In addition, the above-mentioned conventional pneumatic tires do not consider both initial water drainage and abrasion resistance.

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0055] figure 1 It is a partially developed view showing the tread portion 1 of the pneumatic tire of the present embodiment. A plurality of blocks 4 are formed on the tread portion 1 by a plurality of main grooves 2 extending in the tire circumferential direction and a plurality of lateral grooves 3 extending in the tire width direction.

[0056] The main groove 2 is composed of three main grooves 5 , 6 , and 7 in order from the tire widthwise outer side to the tire widthwise inner side. The groove width of the first main groove 5 is the widest, and becomes narrower in the order of the third main groove 7 and the second main groove 6 . The second main groove 6 is located on the centerline CL in the tire width direction.

[0057] The outermost region in the tire width direction defined by the first main groove 5 is the outer shoulder portion 8 . The area divided by the first main groove 5 and the second main groove 6 is the outer central portion 9 . That is, the outer shou...

no. 2 approach

[0082] image 3 It is a partially developed view showing the tread portion 1 of the pneumatic tire of the present embodiment. A plurality of blocks 4 are formed on the tread portion 1 by main grooves 2 extending in the tire circumferential direction and lateral grooves 3 extending in the tire width direction.

[0083] The main groove 2 is composed of three main grooves 25 , 26 , and 27 .

[0084] The first main groove 25 is arranged on the outer side in the tire width direction, and extends in a zigzag shape along the tire circumferential direction. That is, the first main groove 25 includes a first inclined portion 25a inclined inward in the tire width direction and a second inclined portion 25b inclined outward in the tire width direction toward the tire circumferential direction (downward in the figure).

[0085] The second main groove 26 is arranged at the central portion in the tire width direction, and extends while zigzagging in the tire circumferential direction. Th...

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Abstract

A technical problem is to improve the initial drainage performance and improve the grounding performance when turning. As a solution, a pneumatic tire includes block rows which are arranged in a tirewidth direction and each of which includes a plurality of blocks (4) defined by main grooves (2) extending in a tire circumferential direction and lateral grooves (3) extending in a tire width direction. The plurality of block rows includes inner block rows (21, 22, 23) which are the block rows other than an outermost block row (20) located most outwardly in the tire width direction. Numbers of the blocks included in the inner block rows increase toward an inner side in the tire width direction. The blocks (4) in each of the inner block rows (21, 22, 23) include an auxiliary-grooves-formed block (4) having, on an outer surface thereof, an auxiliary groove region in which a plurality of drain auxiliary grooves (24) extending in the tire circumferential direction are formed. Occupied areas in each of the inner block rows (21, 22, 23) decrease toward the inner side in the tire width direction.

Description

technical field [0001] The present invention relates to a pneumatic tire. Background technique [0002] Conventionally, there is known a pneumatic tire having a tread pattern on a land portion, and the tread pattern has a microgroove region in which microgrooves are formed and a non-microgroove region in which no microgrooves are formed (for example, refer to Patent Document 1). [0003] However, the above-mentioned conventional pneumatic tires only have a structure that facilitates the distinction between all-season tires and summer tires, and do not consider ground contact performance during cornering. In addition, the above-mentioned conventional pneumatic tires do not consider both initial water drainage and wear resistance. [0004] prior art literature [0005] patent documents [0006] Patent Document 1: Japanese Patent Laid-Open No. 2017-210168 Contents of the invention [0007] (1) Technical problems to be solved [0008] A first aspect of the present inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03
CPCB60C11/0304B60C11/0323B60C11/0306B60C2011/0351B60C2011/0348B60C11/1376B60C11/1353B60C11/12
Inventor 桒野慎吾西川修一
Owner TOYO TIRE & RUBBER CO LTD
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