Pneumatic tire

A technology of pneumatic tires and tires, which is applied to tire parts, tire tread/tread pattern, transportation and packaging, etc., which can solve the problems of improving snow performance and achieve the effect of improving snow performance and reducing tire noise

Inactive Publication Date: 2009-10-14
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the above-mentioned pneumatic tires, it is not always possible to achieve the above-mentioned reduction in tire noise and improvement in snow performance.

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0104] In order to investigate the effect of the tread pattern 10 of such a tire, a test tire was produced.

[0105] The tire size was set to 265 / 70R17 115H. The rims are set to 17×8J. Make a tire with the tread pattern below. The vehicle used to investigate the tire performance was an SUV vehicle with an engine displacement of 6 liters. The internal pressure conditions were set to 210 (kPa) for both the front and rear wheels.

[0106] The tread patterns are the following patterns a to d. Pattern a is figure 1 In the patterns shown in (a), patterns b to d are patterns that have been changed based on the pattern a. In Table 1 below, the specifications of the patterns a to d are summarized. Patterns b~d are as follows Figures 4 to 6 shown.

[0107] Table 1

[0108] 1st Land Department

1st main slot

2nd Land Department

2nd main slot

3rd Land Department

pattern

a: figure

1(a)

with pattern

Slot 22, knife groove...

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Abstract

The present invention provides a pneumatic tire capable of attaining both a reduction in tire noise and an improvement in on-snow performance and, having a feature in terms of a pattern. Wherein, on groove walls on both sides forming the at least three circumferential grooves, first inclined walls inclined by an inclination angle of 5 to 20 degrees with respect to the tire circumferential direction and second inclined walls inclined by an inclination angle of 0 to 45 degrees with respect to a tire width direction are provided so as to be successively connected in the tire circumferential direction so that positions of groove ends in the tire width direction vary in the tire circumferential direction. Connecting portions between the first inclined walls and the second inclined walls are bent in a V-shape in a plan view of the tread pattern. A length of the first inclined walls is larger than a length of the second inclined walls, every two of the first inclined walls on both sides of each of the second inclined wall have a step amount of 1.5 to 5.0 mm in the tire width direction. Three to five pairs of the first inclined walls and the second inclined walls adjacent to each other areprovided for one tread pattern.

Description

technical field [0001] The present invention relates to a pneumatic tire provided with a tread pattern including at least three or more circumferential grooves extending in the tire circumferential direction. Background technique [0002] Among tires, it is well known that tire noise performance and traction performance (snow performance) on a snowy road surface are incompatible performances. [0003] In order to reduce tire noise, the groove area of ​​the tire is reduced, especially the groove area of ​​the lug groove extending from the tire circumferential direction main groove and inclined in the width direction with respect to the tire circumferential direction main groove. However, in order to improve the performance on snow, the groove area of ​​the lug grooves is increased, and as a result, the reduction of tire noise and the improvement of performance on snow are handled in the opposite manner. In particular, in SUV (Sport Utility Vehicle) tires and all-weather tire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/04
CPCB60C2011/0383B60C2011/0388B60C2011/0381B60C11/13B60C2011/0369B60C11/0302B60C11/0306B60C2011/1338
Inventor 海老子正洋
Owner THE YOKOHAMA RUBBER CO LTD
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