Pneumatic Tire

a pneumatic tire and tire body technology, applied in the field of pneumatic tires, can solve the problems of uneven tread wear, low aspect ratio, and damage to the land portion of the pneumatic tire, so as to improve the durability performance of the belt, prevent damage to the tread rubber, and enhance ride comfort

Inactive Publication Date: 2018-09-27
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a way to make sure that a tire's tread rubbers are protected from being damaged during use without compromising its overall quality or effectiveness. This results in better ride comfort for passengers on vehicles with longer wheelchair lifespan.

Problems solved by technology

The technical problem addressed in this patent is how to improve the durability and stability of pneumatically driven vehicles used in heavy-duty applications while reducing damage caused by external forces during use.

Method used

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  • Pneumatic Tire
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Examples

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examples

[0194]Tires that satisfy and tires that do not satisfy the conditions of feature 1, feature 22, feature 23, feature 17A, feature 17B, and feature 14 described above were evaluated for (1) ride comfort, and (2) belt durability performance.

Ride Comfort

[0195]Test tires with tire size 315 / 60R22.5 were mounted onto a rim of size 22.5″×9.00″, filled to a standard maximum air pressure (900 kPa), and mounted to a 6×4 tractor trailer. A feeling evaluation was then conducted by test drivers on a test course. The feeling evaluation of a tire according to the Conventional Example that does not satisfy any of the conditions of feature 1, feature 22, feature 23, feature 17A, feature 17B, or feature 14 was set as standard (20). The feeling evaluation was conducted by five test drivers, and the total of the scores of the five test drivers was set as the final score. The standard of the feeling evaluation of the tire according to the Conventional Example is 100. The evaluation was expressed by using

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Abstract

In a pneumatic tire, a first imaginary line passes through a ground contact surface in a meridian cross section of a tread portion and a second imaginary line passes through a bottom portion of a shoulder main groove and is parallel to the first imaginary line. Given A as a distance in the tire lateral direction between an intersection point of the first and second imaginary lines and a tire equatorial plane, B as a groove depth of the shoulder main groove, and C as a distance in the tire lateral direction between the ground contact edge and the tire equatorial plane, the condition 0.80≤(B+C)/A≤1.15 is satisfied and, given M as a distance in a tire radial direction between the bottom portion of the shoulder main groove and a belt layer, the condition 0.60≤B/(B+M)≤0.75 is satisfied.

Description

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Claims

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Application Information

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Owner YOKOHAMA RUBBER CO LTD
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