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Pneumatic tire

A technology of pneumatic tires and bead, which is applied to tire parts, bead, transportation and packaging, etc., can solve the problems of increased road noise and achieve the effects of suppressing the increase of road noise, suppressing road noise, and alleviating impact

Inactive Publication Date: 2018-05-11
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in tires with high longitudinal rigidity, the impact from the road surface is transmitted to the rim (axle) without being relieved during running, so road noise may increase

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] made Figures 1 to 2 tires shown. The tire size is 225 / 45R17 94W (rim width 7.5). In this Example 1, the hardness Hr of the reinforcing layer was set at 95. The maximum thickness tr of the reinforcement layer is 5.0 mm. The ratio (hr / ha) of the height hr in the radial direction of the reinforcing layer to the height ha in the radial direction of the apex (hr / ha) was set at 1.0. The hardness Ha of the apex is 90. Therefore, the difference (Hr−Ha) between the hardness Hr of the reinforcing layer and the hardness Ha of the apex is 5. The ratio of the height ha of the apex to the section height H of the tire (ha / H) was 0.25.

Embodiment 2～4

[0086] The thickness tr is as shown in the following Table 1, and the other is the same as that of Example 1, and the tires of Examples 2 to 4 were obtained.

Embodiment 5～8 and comparative example 2

[0088] The ratio (hr / ha) is as shown in the following Table 2, and the other is the same as that of Example 1, and the tires of Examples 5 to 8 and Comparative Example 2 were obtained.

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PUM

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Abstract

The invention discloses a pneumatic tire which can suppress the increasing of the road noise and increase resistance to breakage due to stretching. The tire 2 includes a pair of reinforcing layers 22.Each reinforcing layer 22 is disposed on the internal side of a tire body 12 in the axial direction. The reinforcing layer 22 and an apex strip 30 overlap in the axial direction. In the radius direction, an external end 44 of the reinforcing layer 22 and an external end 32 of the apex strip 30 are consistent in terms of position, or the external end 44 of the reinforcing layer 22 is disposed muchcloser than the external end 32 of the apex strip 30. The reinforcing layer 22 and the apex strip have identical hardness, or the reinforcing layer 22 is much harder than the apex strip 30.

Description

technical field [0001] The present invention relates to pneumatic tires. Background technique [0002] During running, when the tire traverses a step, a portion of the sidewall of the tire may be caught between the rim and the road surface. At this time, excessive tension is applied to the cords contained in the tire, and the cords may break. The damage accompanying such a cord breakage is also referred to as a pinch cut. Various studies have been conducted in order to prevent the occurrence of this stretch (for example, the following Patent Documents 1 and 2). [0003] prior art literature [0004] Patent Literature [0005] Patent Document 1: Japanese Patent Laid-Open No. 2014-113957 [0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2014-172565 [0007] In order to prevent the occurrence of stretch, it is generally studied to use rubber with high hardness for the sidewall of the tire, thicken the sidewall, use a large apex, increase the number of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C15/06
CPCB60C15/06B60C15/0628
Inventor 西岛茂树
Owner SUMITOMO RUBBER IND LTD
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