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

Run flat tire

A technology for run-flat tires and tire width direction, applied in tire parts, bead, vehicle parts, etc., can solve the problems of bead part falling off, tire deformation, bead part crossing the rim flange, etc.

Inactive Publication Date: 2016-01-06
BRIDGESTONE CORP
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a run-flat tire is cornered, the tire undergoes significant deformation in the tire width direction, particularly because of the lateral force applied due to the cornering.
The deformation of the run-flat tire caused by the lateral force in turn pulls the bead portion of the tire and the corresponding sidewall portion toward the turning center side, thereby possibly causing the bead portion to go over the rim hump, thereby possibly falling to the wellbed of the rim, or possibly to pass the bead portion over the rim flange
As a result, the bead portion in a run-flat tire tends to come off the rim seat of the rim

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
  • Run flat tire
  • Run flat tire
  • Run flat tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The test tires of Example 1 to Example 21 all have sidewall reinforcing rubber, the tire size of 205 / 55R16, the characteristics shown in Table 1 and as figure 1 with figure 2 structure shown. The tires of Comparative Examples 1 to 4 were prepared in the same manner as the tires of Example 1, except that the corresponding structures of the bead portions of Comparative Examples 1 to 4 were different from those of Example 1 in the relevant features shown in Table 1. Test tires. The performance of these test tires was evaluated by the following method. The results 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

No PUM Login to View More

Abstract

The objective of the present invention is to provide a run flat tire (1) that can secure sufficient resistance to rim detachment even during run flat traveling and while maintaining the durability of a side reinforcing rubber. The run flat tire (1) is provided with: a tread section; a pair of side wall sections that are contiguous with both sides of the tread section; a bead section (2) that is contiguous with each side wall section; a bead core (5) that is embedded in the bead section (2); and a side reinforcing rubber that has a crescent-moon-shaped cross section and that is provided to the side wall section. The run flat tire (1) is characterized in that in a cross sectional view in the direction of tire width, the diameter (Dc) at the inside end in the direction of the tire diameter of the bead core is 3.0-4.5 mm larger than the rim diameter (Dr), and the diameter (Dh) of the bead heel point (Ih) of the bead section (2) is 1.7-2.9 mm smaller than the rim diameter (Dr) of the rim of application.

Description

technical field [0001] The present invention relates to run flat tires. Background technique [0002] Various types of sidewall reinforcement have been proposed as so-called "run-flat tires" capable of running for a certain distance without loss of load carrying capacity when the tire internal pressure has decreased due to punctures or the like type run-flat tire, in which sidewall reinforced type run-flat tire, by providing a sidewall reinforcing rubber having a crescent-shaped cross-section and relatively high elasticity on the inner peripheral side of the carcass of each sidewall portion of the tire, To enhance the rigidity of each sidewall portion. [0003] Each sidewall having the sidewall reinforcing rubber as described above is reinforced when the tire is running straight in run-flat running (that is, running in a state where the internal pressure of the tire is significantly lowered due to a puncture or the like). Type run-flat tires are able to run without undergo...

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): B60C15/024B60C15/06B60C17/00
CPCB60C15/024B60C17/0009B60C15/06
Inventor 本居修
Owner BRIDGESTONE CORP