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Pneumatic tire

A pneumatic tire, tire circumferential technology, applied in the direction of the reinforcement layer of the pneumatic tire, tire parts, tire tread/tread pattern, etc., can solve the problem that the studless tire has no inspiration, is difficult, etc.

Inactive Publication Date: 2011-08-24
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is considered that this tire is also difficult to say that the effect of suppressing the inclination of the land portion is sufficient, and the contribution to the balance of snow performance and dry performance is small.
In addition, there may be separation starting from the end of the ply
Originally, this tire was used as a racing tire, and there was no suggestion for a solution to the above-mentioned problems of studless tires

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] Next, examples and the like that specifically illustrate the configuration and effects of the present invention will be described. In addition, the evaluation items of an Example etc. were measured as follows.

[0043] (1) Snow performance

[0044] The test tires were mounted on an actual vehicle (domestic passenger car), and the vehicle was driven on an icy and snowy road, and the braking distance when the ABS was activated by applying a braking force from an entry speed of 40 km / h was measured. Taking the result of Comparative Example 1 as 100, the reciprocal of the measured value was indexed. The larger the index, the better the snow performance (especially the braking performance).

[0045] (2) Dry performance

[0046] Test tires were mounted on the above-mentioned actual vehicles, and cornering and braking were carried out on a test road with dry ground, and the steering stability, cornering performance and braking performance were evaluated by the driver's senso...

Embodiment 1～4

[0052] Example 1 is formed to adopt a single cap reinforcement structure in the same manner as Comparative Examples 2 and 3, and arrange such as figure 2 The illustrated reinforcement lamination is the same as Comparative Example 1 except for this. In addition, Embodiment 2 is formed, except that the reinforcement laminated portion is as Figure 3a Except for the structure shown, it is the same as in Example 1. In addition, Example 3 is formed, except that the reinforcement laminated portion is as Figure 4 Except for the structure shown, it is the same as in Example 1. Embodiment 4 is formed so that, instead of a single cap reinforcement structure, such as figure 1 It is the same as that of Example 1 except for a pair of reinforcing end portions covering both ends of the belt layer in this way.

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PUM

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Abstract

In a pneumatic tire having a tread rubber which is provided with a plurality of main grooves extending along a tire circumferential direction, and a land portion comparted by the main grooves, a belt layer which is embedded in the tread rubber, and a belt reinforcing layer which is arranged in an outer periphery of the belt layer, the belt reinforcing layer has a reinforcement laminated portion constructed by at least three layers in an inner region of the land portion, and the reinforcement laminated portion is structured such that a depth from a tread surface to an outermost layer is smaller than a groove depth of the main groove, and the outermost layer covers a side of an end portion of a layer positioned in an inner periphery thereof.

Description

technical field [0001] The present invention relates to a pneumatic tire capable of satisfactorily achieving both running performance on icy and snowy roads and running performance on dry roads, and is particularly useful as a studless tire. Background technique [0002] Typically in studless tires, a softer rubber is used for the tread. This makes it easier for the land portion to incline appropriately when braking or turning, and the edge effect that accompanies this phenomenon can improve running performance on ice and snow roads with a low coefficient of friction (hereinafter referred to as snow performance. ). [0003] However, in recent years, due to the influence of warm winters caused by global warming, chances of using studless tires to drive on dry roads have increased, and there is a situation in which not only snow performance but also running performance on dry roads (hereinafter referred to as dry road performance) are required. performance.) trend. By using...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/18B60C9/26
CPCB60C2011/0033B60C11/0306B60C9/18B60C2009/2219B60C9/26B60C9/2204
Inventor 朝山佳则
Owner TOYO TIRE & RUBBER CO LTD
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