Run-flat tire

A run-flat tire and tread technology, which is applied to the reinforcement layer of pneumatic tires, special tires, tire parts, etc., can solve the problems of non-driving performance research, high-speed straight running stability and low fuel consumption research, and achieve Excellent run-flat performance, excellent high-speed straight running stability, low dry performance and low wet performance

Inactive Publication Date: 2011-05-11
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] With conventionally proposed sidewall-reinforced run-flat tires, even in a state where the internal pressure of the tire is reduced due to air leakage or the like, the tire does not lose its load-bearing capacity and can run safely for a certain distance. Insufficient study of the running performance when not leaking air, that is, when inflated
That is, for run-flat tires, the characteristics required in recent years, that is, the above-mentioned high-speed straight running stability, dry performance and wet performance, and low fuel consumption have not been sufficiently studied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5 and comparative example 1～4

[0060] made as image 3 The sidewall-reinforced run-flat tire shown includes two layers of intersecting belt layers and tread rubber in order in the radial direction of the crown portion of the carcass layer. . Materials satisfying the conditions shown in Tables 2 and 3 below were used as the belt layers of the respective Examples and Comparative Examples. The tire size is 225 / 45R17, and the angle of the cross belt layer is ±62° with respect to the tire width direction. The compounding of the tread rubber used is shown in Table 1 below.

[0061] Table 1

[0062]

[0063] Table 2

[0064]

[0065] Each of the obtained test tires was evaluated as described below. The results are shown in Table 3 below together with the measured values ​​of the dynamic storage elastic modulus E' at 30°C and the loss tangent tanδ at 60°C of the tread rubber.

[0066] Determination of E' and tanδ

[0067] The dynamic storage elastic modulus (E') at 30°C and the loss tangent (tanδ...

Embodiment 6

[0085] The conditions related to the tread rubber and the intersecting belt layers were the same as in Reference Example 2, and a sidewall-reinforced run-flat tire having sidewall reinforcing rubber was produced.

[0086] Total strain energy loss evaluation

[0087] For each of the obtained test tires, the strain energy loss in the tread portion was analytically calculated, and the sum thereof was obtained. In addition, the differences between the test tires having the same structure except for the belt structure (between Reference Example 1 and Reference Example 2 and between Comparative Example 5 and Example 6) were obtained, respectively. The resulting rate of change of the total strain energy loss.

[0088] The results are collectively shown in Table 4 below.

[0089] Table 4

[0090]

[0091] As shown in Table 4 above, when comparing the normal tire of Reference Example 1 and the run-flat tire of Comparative Example 5 to which the same belt structure (1) was app...

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Abstract

Provided is a run-flat tire which has an excellent run-flat performance as well as a high high-speed straight running stability in the non-punctured state, a high steering stability on both of a dry road surface and a wet road surface and a good fuel efficiency. A run-flat tire which comprises at least two cross belt layers formed by rubberizing a steel cord and a tread rubber located successively, wherein a reinforcing rubber is provided inside a carcass. The above-described steel cord has a single twisted structure or a core / single layered sheath structure consisting of 6 to 10 steel strands having a strand diameter of 0.10 to 0.20 mm. The density of the implanted steel cords is 40 cords / 50 mm or more and the distance between the adjacent steel cords in the belt layer is 0.3 mm or longer. Moreover, the dynamic storage modulus E' (MPa) at 30 DEG C of the tread rubber and tand at 60 DEG C of the same respectively satisfy the relationships represented by the formulae: 5.0<=E' and 0.050<=tand<=0.240.

Description

technical field [0001] The present invention relates to a run-flat tire which can run a relatively long distance even in a run-flat state in which the air in the tire leaks due to a leak, thereby improving the safety of the vehicle. It relates to not only the above-mentioned excellent run-flat performance, but also the high-speed straight running stability when the air is not leaking, that is, when the air is inflated, and the handling stability on the dry road surface and the wet road surface (hereinafter respectively referred to as "dry ground performance") " and "wet performance"), and run-flat tires that are also excellent in low fuel consumption. Background technique [0002] As a run-flat tire that can safely travel a certain distance without losing the load bearing capacity even in the state where the tire internal pressure drops due to air leakage or the like, various sidewall-reinforced tires have been proposed. Air-retaining tires, that is, a sidewall reinforcing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C17/00B60C1/00B60C9/00B60C9/20B60C11/00D07B1/06
CPCB60C1/0016B60C9/2006B60C17/0009B60C2011/0025B60C2017/0063C08K3/013C08L21/00
Inventor 林省二森井贵朗
Owner BRIDGESTONE CORP
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