Pneumatic tire

A technology of pneumatic tires and tires, which is applied to tire parts, tire tread/tread pattern, transportation and packaging, etc. It can solve the problems of deterioration of operational stability and difficulty in satisfying improvements, and achieve improved hand feeling and improved braking Performance and cornering performance, the effect of improving quietness

Inactive Publication Date: 2006-11-22
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] However, even if there is a solution to the inclination angle and width of the lug grooves, as long as there are lug grooves, there is naturally a limit to the compatibility of wet road performance and noise performance, and it is difficult to meet further improvement requirements.
In addition, if the negative ratio is increased, there is also a problem of deteriorating operational stability

Method used

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  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] Among pneumatic tires with a tire size of 205 / 65R15, the tires of Examples 1 to 3 were produced respectively, and these tires formed figure 1 Such a tread pattern, and the ratio of the minimum distance W2 between the wavy or zigzag thin grooves formed on the first land portion and the outer wall surface of the first land portion to the width W1 of the first land portion (W2 / W1×100), and the ratio (W3 / W1×100) of the amplitude W3 of the wavy or zigzag narrow grooves formed on the first land portion to the width W1 of the first land portion (W3 / W1×100) are shown in Table 1, respectively. different.

[0034] For comparison, tires of Comparative Examples 1 to 3 in which the respective ratios were varied as shown in Table 1 were produced. In addition, in Comparative Examples 1 and 2, no fine grooves were provided in the rib-shaped land portion located in the tread center portion.

[0035] For these test tires, wet cornering performance, wet braking performance, noise perfo...

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Abstract

A pneumatic tire capable of simultaneously achieving wet performance and noise performance while enhancing driving stability. The pneumatic tire has a rib-like land portion extending in the circumferential direction of the tire, in the central portion of the tread; a left and right pair of first grooves extending in the circumferential direction of the tire while being next to both sides of the rib-like land portion; and a left and right pair of first land portions extending in the circumferential direction of the tire while being next to the outsides of the first grooves. Narrow grooves extending in the circumferential direction of the tire are provided in the rib-like land portion. Further, lug grooves and zigzag narrow grooves are provided in the first land portions, where the lug grooves do not communicate with the first grooves and incline relative to the tire equator, and the undulating or zigzag narrow grooves extend in the tire circumferential direction. The minimum distance (W2) between an undulating or zigzag narrow groove and the outer side wall of a first land portion is set 60-70% of the width (W1) of the first land portion, and the amplitude (W3) of the undulating or zigzag narrow groove is set 5-12% of the width (W1) of the first land portion.

Description

technical field [0001] The present invention relates to a pneumatic tire having a tread pattern mainly composed of grooves and thin grooves extending along the tire circumferential direction, and more specifically, to a pneumatic tire capable of achieving both wet performance and noise performance while improving handling stability. Pneumatic tires. Background technique [0002] In order to improve the wet road performance of pneumatic tires and reduce noise, generally a plurality of main grooves extending along the tire circumferential direction and a plurality of pattern grooves inclined relative to the tire equator line are arranged on the tread (for example, refer to patent Document 1 and Patent Document 2). Here, it is effective to increase the negative ratio (groove area ratio) in order to improve wet performance, and it is effective to decrease the negative ratio in order to reduce noise. These conditions for improving wet performance and noise performance are opposi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/04B60C11/12
CPCB60C11/0306B60C11/12B60C2011/0383B60C11/03B60C11/04
Inventor 山根贤司
Owner THE YOKOHAMA RUBBER CO LTD
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