Unlock instant, AI-driven research and patent intelligence for your innovation.

Pneumatic tire

a technology of pneumatic tires and tires, which is applied in the field of pneumatic tires, can solve the problems of insufficient suppression, cracks, and degradation of tire durability, and achieve the effects of improving durability and driveability, reducing driveability degradation, and excellent durability and driveability

Inactive Publication Date: 2012-09-27
BRIDGESTONE CORP
View PDF2 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a pneumatic tire that is designed to improve its durability and driveability during high-speed running of the vehicle. The technical effect of the invention is to provide a tire that can withstand high-speed driving without succumbing to deformation or cracking, while also maintaining its durability and driveability. This is achieved by designing a tire with a unique structure that includes an intersecting belt layer and a spiral belt layer, which work together to prevent deformation and diameter growth of the tire. Additionally, the inclination angle of the cords in the first and second inclined belt layers is set within a specific range to further improve the tire's durability without compromising its driveability.

Problems solved by technology

This configuration cannot sufficiently suppress the deformation (elongation) of the belt layers in the tire circumferential direction and outward expansion (diameter growth) of the tire in the tire radial direction resulting from the elongation.
Accordingly, in the conventional pneumatic tire, when the inside belt layer, the outside belt layer, and the spiral belt layer are subjected to a large tensile force in the tire circumferential direction due to inflation pressure or centrifugal forces during high-speed running, it is necessary to suppress the diameter growth of the tire only by the spiral belt layer, which may result in degradation in durability of the tire.
Further, when the circumferential cord of the spiral belt layer is ruptured as being penetrated by a foreign object or the like, the tread portion is greatly deformed due to tensile force in the tire circumferential direction, which may lead to the occurrence of cracks.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pneumatic tire
  • Pneumatic tire
  • Pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

examples 2 to 5

[0030]There were manufactured pneumatic tires as samples, similarly to Example 1, except that the inclination angle A2 of the second cords was changed as shown in Table 1. Then, each tire was subjected to performance evaluation similarly to Example 1. The results thereof are shown in Table 1.

examples 6 to 10

[0031]There were manufactured pneumatic tires as samples, similarly to Example 1, except that the inclination angle A2 of the second cords was set to 30 degrees and the spiral cord was changed in rupture elongation. Then, each tire was subjected to performance evaluation similarly to Example 1. The results thereof are shown in Table 1.

examples 11 , 12

Examples 11, 12

[0032]There were manufactured pneumatic tires as samples, similarly to Example 1, except that the inclination angle A2 of the second cords was set to 30 degrees and the spiral cord was changed in type. Then, each tire was subjected to performance evaluation similarly to Example 1. The results thereof are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
inclination angleaaaaaaaaaa
inclination angleaaaaaaaaaa
inclination angleaaaaaaaaaa
Login to View More

Abstract

Provided is a pneumatic tire having excellent durability and driving stability during high-speed running of the vehicle (that is, during high-speed rotation of the tire). The pneumatic tire includes: a carcass; an intersecting belt which is provided on the outer circumference side of a crown portion of the carcass and formed of two inclined belt layers having cords inclined and extending in a direction intersecting each other across a tire equatorial plane; and a circumferential belt layer which is provided on either one of the inner side and the outer side of the intersecting belt in the tire radial direction and includes a spiral cord arranged as being spirally wound at an inclination angle of equal to or smaller than 5 degrees to the tire equatorial plane. Of the two inclined belt layers forming the intersecting belt, the cords in a first inclined belt layer are inclined at an inclination angle that falls within the range of 45 to 90 degrees relative to the tire equatorial plane, while the cords in a second inclined belt layer are inclined at an inclination angle that falls within the range of 15 to 45 degrees relative to the tire equatorial plane and is smaller than the inclination angle of the cords in the first inclined belt layer.

Description

TECHNICAL FIELD[0001]The present invention relates to a pneumatic tire, in particular, a pneumatic tire excellent in durability and driveability during high-speed running of the vehicle (that is, during high-speed rotation of the tire).RELATED ART[0002]In recent years, along with the enhanced performance of vehicles, there are increasing occasions to run vehicles at high speed. Accordingly, pneumatic tires to be mounted on vehicles are also required to have further improved durability and driveability (steering stability) during high-speed running.[0003]In view of this, there has been proposed a pneumatic tire including: two belt layers (an inside belt layer and an outside belt layer) which are arranged so that steel cords embedded in these layers intersect with each other; and a spiral belt layer provided with a circumferential cord (spiral cord) embedded therein, the circumferential cord being spirally wound substantially parallel to the tire circumferential direction, in which th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): B60C9/18
CPCB60C9/2009B60C9/2204B60C9/0007B60C2009/2022B60C2009/2016Y10T152/10801B60C9/2003B60C9/20B60C9/0042B60C2009/2093B60C2009/2019B60C9/2006
Inventor ICHIHARA, EIJI
Owner BRIDGESTONE CORP