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pneumatic tire

A technology for pneumatic tires and tires, which is applied to the reinforcement layer of pneumatic tires, tire parts, tire tread/tread pattern, etc., and can solve uneven contact pressure, separation of treads, uneven wear of tire shoulders, etc. problems, achieving uniform ground contact pressure, suppressing uneven wear, and improving high-speed durability

Inactive Publication Date: 2016-10-26
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of radial tire has such a problem: the delamination (English: lifting) at both ends of the tire axial direction of the belt layer is generated when driving at high speed, and the tread separation is easy to occur.
[0005] However, in the above-mentioned pneumatic tire, the end of the belt layer is excessively tightened by the shoulder belt layer, so the crown land portion (Japanese: クラウンland portion) is damaged due to the internal pressure filling of the tire and the centrifugal force during running. ) is relatively larger than the bulge of the shoulder landing part (Japanese: ショルダーland part)
Therefore, there is such a problem: if Figure 4 As shown, in the shape of the ground contact surface, the maximum ground contact length a in the tire circumferential direction of the shoulder land portion A is smaller than the tire circumferential ground contact length b in the tire equator C, and the crown land portion and the shoulder land portion uneven ground contact pressure, such as uneven wear on the shoulder lands

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0061] Prototype according to the specifications in Table 1 figure 1 The basic construction of the pneumatic tire of size 235 / 50R18 was carried out, and the durability was measured. The test method is as follows.

[0062] Durability:

[0063] The tire to be tested was run on a roller at a speed of 70 km / h under the conditions of a rim of 18×7JJ, an internal pressure of 180 kPa, and a load of 6.15 kN, and the distance traveled until the tire shoulder landed was damaged was measured. As a result, comparative example 1 was made into an index of 100, and this result shows that the durability is higher as the numerical value is larger.

[0064] The test results are shown in Table 1.

[0065] Table 1:

[0066]

[0067] As a result of the test, it was confirmed that the tires of Examples 1 to 9 had improved durability compared to the tires of Comparative Examples 1 and 2.

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Abstract

A pneumatic tire is provided with a tire body (6), a belt ply (7) and a tire shoulder belt-shaped layer (9). Tire surface rubber (2G) which is configured on a tire surface (2) comprises the following components: a pair of tire shoulder grounding parts (11) which is provided at a tire radial outside of the tire shoulder belt-shaped layer (9); and a tire crown grounding part (12) which is provided between the tire shoulder grounding parts (11). The contour of the external surface of the tire shoulder grounding parts (11) is provided at the radial outside of the tire for 0.5-1.5mm relative to an elongation contour which is obtained through imaginarily elongating the contour of the external surface of the tire crown grounding part (12) to outside. According to the pneumatic tire, non-uniform abrasion of the tire shoulder grounding part can be restrained.

Description

technical field [0001] The present invention relates to a pneumatic tire in which uneven wear of tread rubber is suppressed. Background technique [0002] In recent years, as the performance of vehicles has increased, higher high-speed durability has also been demanded for pneumatic tires. Therefore, there is provided a tire in which a belt layer for tightening a radially structured carcass is provided in a tread portion to improve the rigidity and durability of the tread portion, thereby meeting the demand for higher performance. However, such radial tires have the following problem: delamination (English: lifting) occurs at both ends of the tire axial direction of the belt layer when running at high speed, and tread separation is likely to occur. [0003] In response to the above-mentioned problems, a pneumatic tire has been proposed in which a shoulder belt layer is provided at an axially outer end of the belt to suppress delamination of the belt (for example, Patent Doc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C9/18B60C11/117
Inventor 桥本圭介
Owner SUMITOMO RUBBER IND LTD
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