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Pneumatic tire

A pneumatic tire, tire circumferential technology, applied in the direction of pneumatic tires, tire parts, tire tread/tread pattern, etc., can solve the problems of decreased driving stability on dry roads, decreased driving stability, and decreased rigidity of the tread surface , to achieve the effect of improving driving stability, suppressing the reduction of rigidity, and ensuring drainage performance

Active Publication Date: 2018-02-16
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the number of lug grooves in the tread portion is increased, the rigidity of the tread portion decreases, and the driving stability on a dry road surface decreases.
Conversely, when the number of lug grooves in the tread portion is reduced, drainage performance is reduced, and driving stability on wet roads is reduced.
As a result, driving stability on dry roads is in a contradictory relationship with driving stability on wet roads, and it is difficult to improve both

Method used

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  • Pneumatic tire
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Examples

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example

[0043] The following tires of Examples 1 to 8 were produced: among the pneumatic tires having a tire size of 215 / 55R17, having a tread portion, a pair of sidewall portions, and a pair of bead portions, and specifying an attachment direction relative to a vehicle, such as figure 2 As shown, four main grooves including a pair of center main grooves extending in the tire circumferential direction and a pair of shoulder main grooves extending in the tire circumferential direction outside the center main grooves are provided on the tread portion, and these main grooves divide There are 5 rows of land portions, and the center main groove on the outside of the vehicle is zigzag along the tire circumferential direction, and the tread portion is provided with main grooves other than the zigzag center main groove extending toward both sides in the tire width direction and ending at each ring. Multiple horizontal grooves in the shore.

[0044] For comparison, a tire of a conventional ex...

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Abstract

A pneumatic tire is provided which makes it possible to achieve both steering stability on dry road surfaces and steering stability on wet road surfaces. This pneumatic tire is provided with a tread portion, a sidewall, and a bead, and has a mounting direction specified with respect to the vehicle, wherein: four main grooves are provided, which include a pair of center main grooves which extend inthe tread portion in the tire circumferential direction and a pair of shoulder main grooves which are outside of the center main grooves and extend in the tire circumferential direction; five land portions are defined by said main grooves, and the center main groove to the outside of the vehicle has a zigzag shape along the tire circumferential direction; multiple lug grooves are provided in theland portions and extend from the main grooves other than the center main groove that has a zigzag shape, towards both sides in the width direction of the tire, and terminate within the respective land portion.

Description

technical field [0001] The present invention relates to a pneumatic tire in which four main grooves extending in the tire circumferential direction are provided on the tread portion, and five rows of lands are divided by these main grooves. It is a pneumatic tire optimized to take into account the contradictory relationship between driving stability on dry roads and driving stability on wet roads. Background technique [0002] Pneumatic tires employ a tread pattern in which a plurality of main grooves extending in the tire circumferential direction are provided in a tread portion and a plurality of rows of land portions are defined by these main grooves (for example, refer to Patent Document 1). In such a pneumatic tire, a plurality of lug grooves extending in the tire width direction are provided in each land portion of the tread portion, thereby ensuring good drainage performance based on the lug grooves. [0003] However, when the number of lug grooves in the tread porti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C5/00B60C11/12
CPCB60C11/0306B60C2011/0388B60C11/032B60C2011/0353B60C2011/0346B60C2011/1209B60C2011/0365B60C2011/0383B60C2011/0348B60C2011/0381B60C11/0304B60C5/00B60C11/03B60C11/12B60C11/0302B60C11/0311B60C11/033B60C13/02B60C2011/1213
Inventor 芝井孝志
Owner THE YOKOHAMA RUBBER CO LTD
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