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

Runflat tire

A technology for pneumatic tires and tires, which is applied to the reinforcement layer, tire parts, tire tread/tread pattern of pneumatic tires, etc., and can solve the problems of increased bending stiffness and deterioration of riding comfort.

Inactive Publication Date: 2007-08-01
SUMITOMO RUBBER IND LTD
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in this structure, since the bending rigidity increases all the time, that is, during both normal driving and flat tire driving conditions, deterioration of ride comfort during normal driving is inevitable

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
  • Runflat tire
  • Runflat tire
  • Runflat tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] According to the present invention, a run flat tire 1 is a pneumatic tire having: a tread portion 2; a pair of axially spaced bead portions 4 each having a bead core 5 therein; and a pair of sidewall portions 3, which extend between the tread edge and the bead portion 4. The tire 1 includes: a carcass 6 extending between bead portions 4; a belt layer 7 provided in the tread portion 2 on the radially outer side of the carcass 6; and side reinforcing rubber 9 provided on The axially outer side of the carcass 6 in each sidewall portion 3 .

[0024] In this embodiment, the run-flat tire 1 is a low-aspect-ratio radial tire for passenger cars. However, the present invention can be applied to various tires requiring ride comfort.

[0025] The carcass 6 is composed of at least one ply 6A having rubberized cords arranged radially at an angle ranging from 75° to 90° with respect to the equator C of the tire, the ply 6A passing through the tread portion 2 and the sidewalls 3, e...

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

No PUM Login to View More

Abstract

A pneumatic tire comprises a sidewall reinforcing rubber disposed axially inside the carcass in each of the sidewall portion, and in order improving the ride comfort during normal running without deteriorating runflat performance, the axially inner surface of the sidewall reinforcing rubber is provided with a circumferentially extending groove. when the tire is deflated, the groove in the ground contacting patch is closed and the sidewall reinforcing rubber supports the tire load. when the tire is inflated-normally, as the sidewall portion can be bent around the groove, the ride comfort is improved.

Description

technical field [0001] The present invention relates to a run-flat tire, and more particularly, to a sidewall structure capable of improving ride comfort during normal running without deteriorating run-flat performance. Background technique [0002] There has been proposed a run-flat tire (b) as shown in Fig. 13, which is provided with crescent-shaped sidewall reinforcing rubber (d) in each sidewall portion (c), such as shown in US Patent No. 5,058,646 . A crescent-shaped sidewall reinforcing rubber (d) is provided axially inside the carcass (a) to increase the bending rigidity of the tire sidewall portion (c) to support the tire load during a flat tire running condition. [0003] However, in this structure, since the bending rigidity increases all the time, that is, increases during both normal running and flat running conditions, deterioration of ride comfort during normal running is inevitable. Contents of the invention [0004] Accordingly, an object of the present i...

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(China)
IPC IPC(8): B60C17/08B60C9/02B60C13/00
CPCB60C17/10B60C17/0009B60C2013/026B60C17/00B60C11/0083B60C17/0045
Inventor 石田孝明山下文一神顷明国安恭彰田波由里江
Owner SUMITOMO RUBBER IND LTD