Bead core of pneumatic tire

A technology for pneumatic tires and bead cores, which is applied to tire parts, tires, tire edges, etc., and can solve problems such as damage to the inner liner rubber.

Inactive Publication Date: 2005-11-16
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the tip a1 of the staple device (a) protrudes through the carcass cord into the side of the tire cavity, causing damage to the inner liner rubber

Method used

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  • Bead core of pneumatic tire
  • Bead core of pneumatic tire
  • Bead core of pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] The staple device 12 was manufactured with various changes in the number (m) and height (h) of the concave portion 14 formed, and it was used for a bead body having a horizontally long and flat hexagonal truncation 11( image 3 ). The bead core 5 with the bead wire 10 fixed by the staple device 12 was used to prepare 1000 green tires by the ordinary method. It is detected whether the tip portion of the staple device 12 is exposed to the inner cavity of the tire when the rotational displacement occurs. The incidence rate (%) of exposure is shown in the appendix Figure 7 .

[0046] As described above, when the number (m) of concave portions of the staple device is 2 or 3, when the height (h) is set within the range of 0.5 to 1.3 mm, the incidence of exposure can be limited to 0%. Furthermore, when the number (m) of concave portions of the staple device is 4, when the height (h) is set within the range of 0.4 to 0.8 mm, the incidence of exposure can be limited to 0%. ...

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PUM

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Abstract

PROBLEM TO BE SOLVED: To suppress positional displacement around a bead core of a staple metal fitting, and effectively suppressing damage on an inner liner rubber caused by this positional displacement.

Description

technical field [0001] The present invention relates to a bead core for a pneumatic tire in which bead wires can be prevented from loosening using staple fittings. Background technique [0002] Bead cores for pneumatic tires of so-called single-coil structure in which a single bead wire is continuously wound in multiple rows and stages are being used in large quantities. In the case where the bead core has such a structure, the bead core is usually reinforced by wrapping the entire bead core with a wrapping layer made of woven cloth or the like to prevent loosening of the entangled and overlapped bead wire, and to maintain its shape in cross-section. However, such wrapping operations are less efficient and result in reduced productivity or higher costs. [0003] Therefore, in recent years, a C-shaped staple device (a) made of a metal wire rod (wire rod) has been used to wrap the periphery of the bead core (b) as shown in Figure 8 (A), so tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C15/04B29D30/48D07B1/18
CPCB60C15/04
Inventor 铃木和也
Owner SUMITOMO RUBBER IND LTD
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