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

pneumatic tire

A technology of pneumatic tires and tires, applied in tire parts, tire edges, transportation and packaging, etc., can solve problems such as cracking, and achieve the effect of excellent affinity, small hardness difference, and inhibition of cracking

Active Publication Date: 2016-09-21
TOYO TIRE & RUBBER CO LTD
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The inventors of the present invention have made repeated studies in order to achieve the above object, and found the following problem in the structure of the above-mentioned prior art: the rubber chafer and the inner liner rubber having a large difference in hardness are in a narrow area ( Figure 4 The area X) is in contact, so that the interface between the rubber chafer and the inner liner rubber is exposed on the inner surface of the tire, which is the main cause of cracking

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

Embodiment ）

[0057] Hereinafter, examples showing the configuration and effects of the present invention will be described. Each test was performed as follows.

[0058] (1) Endurance test for checking crack resistance

[0059] The tire with standard internal pressure and standard load was driven for 100,000 km using a drum test machine. After that, the tire was removed from the rim, and the presence or absence of the inner surface of the tire at the bead portion was confirmed. Cracks occur. Here, the standard internal pressure refers to the air pressure corresponding to the maximum load (maximum load capacity) of the single wheel of the applicable model described in JATMA; the standard load refers to the maximum load (maximum load capacity) of the single wheel of the applicable size described in JATMA .

[0060] (2) Air permeability test

[0061] In a temperature-controlled room, tires to which a standard internal pressure was applied were left for three months, and the subsequent inte...

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 invention provides a pneumatic tire with improved anti-fracturing performance of the tire inner face of a tire ring part. The solution is that isolation glue (6) contacting with the outer surface of the inner bushing rubber (5) is provided with an extending part (61) that is more adjacent to the radial inner V side of the tire than the inner bushing rubber (5) and extends. Cord thread chafer (7) arranged along the cord fabric layer (4) on the periphery of the tire ring core (1a) is provided with an end part (7Ei) between the cord fabric layer (4) and the isolation glue (6). Rigidity difference of the rubber chafer forming the bottom face of the chafer and the isolation glue (6) is within 5 degrees. An interface (11) of the inner bushing rubber (5) and the isolation rubber (6) is exposed out of the tire inner face. An interface (12) of the isolation glue (6) and the rubber chafer (8) is more adjacent to the radial inner side of the tire relative to the end part (7Ei) of the cord thread chafer (7) and is exposed on the inner face of the tire and the extending part (61) is exposed out of the inner face of the tire between the interface (11) and the interface (12).

Description

technical field [0001] The present invention relates to a pneumatic tire having excellent crack resistance in the tire inner surface of a bead portion, and is particularly useful as a heavy-duty pneumatic tire. Background technique [0002] Such as Figure 4 As shown, in the pneumatic tire for heavy load, in order to be durable under high internal pressure and high load, a rubber chafer made of hard rubber with excellent wear resistance is placed on the bottom surface of the bead in contact with the rim 38 (rubber chafer). In addition, the air-impermeable inner liner rubber 35 is disposed on the inner surface of the tire in order to properly maintain the air pressure. exist Figure 4 Among them, a structure in which the end portion 35E of the inner liner rubber 35 is covered with the rubber chafer 38 and the end portion of the inner liner rubber is exposed to the inner surface of the tire is also known (for example, Patent Documents 1-3). [0003] When loading and unloadin...

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 Patents(China)
IPC IPC(8): B60C15/00B60C15/04
Inventor 仲俣常隆
Owner TOYO TIRE & RUBBER CO LTD