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Annular concentric stranded bead cord and method for producing the same

A ring-shaped, bead-shaped technology, applied to tires, bead edges, tire parts, etc., can solve problems such as uselessness and insufficient rigidity, and achieve high performance and easy storage

Active Publication Date: 2007-06-27
SUMITOMO ELECTRIC IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annular core made of nylon 6 or polyethylene naphthalate (PEN) mentioned in the example of Patent Document 2 is not rigid enough if its diameter is equal to that of a conventional steel annular core
So this kernel is practically useless

Method used

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  • Annular concentric stranded bead cord and method for producing the same
  • Annular concentric stranded bead cord and method for producing the same
  • Annular concentric stranded bead cord and method for producing the same

Examples

Experimental program
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Effect test

Embodiment Construction

[0041] Embodiments of the present invention will now be described with reference to the drawings. As shown in FIGS. 1( a ) to 1 ( c ), the endless concentrically placed bead cord of this embodiment includes an annular core 1 and a wrapping wire 2 helically wound around the annular core 1 six times. In this embodiment, the wrapping wire 2 forms a single sheath. However, the wrapping wire 2 can form multiple sheaths.

[0042] The annular core 1 is formed by circularly bending steel wires, welding their ends together, and applying a corrosion-resistant coating to the wire surface to form a corrosion-resistant coating film 3 on the wire surface over its entire circumferential length. By selecting an appropriate coating method and adjusting its thickness, the coating film 3 is formed so that its surface is smooth. This enables smooth winding of the wrapping wire 2 around the annular core 1 .

[0043] The winding wire 2 is made of high carbon steel and has a smaller diameter than...

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Abstract

An annular concentric stranded bead cord having an annular core, which cord is imparted with stable corrosion resistance over a long term at a low cost. The surface of a steel wire in an annular core (1) is applied with a corrosion-resistant paint and covered with a thick coating film (3) so that the surface of the steel wire is not exposed easily even if fretting takes place between the annular core (1) and a side wire (2), thereby ensuring stable corrosion resistance of the annular core (1) over a long term at a low cost.

Description

technical field [0001] The present invention relates to bead cords embedded in the bead of a pneumatic tire for the purpose of reinforcing the tire bead, and more particularly to a concentric-lay bead cord comprising an annular Annular core and a single sheath or multiple sheaths formed by helically winding a winding wire around an annular core, and a method of producing such a bead cord. Background technique [0002] The ring-shaped concentrically placed bead rope is widely used as a reinforcing member for the bead of various vehicle tires. In order to ensure a stable shape and sufficient rigidity, many such annular concentrically placed bead cords include a single or multiple layers of small diameter winding wire helically wound around the annular core, which contains a large diameter steel wire. [0003] The wrapping wire of this bead cord is usually plated with brass or bronze to enhance the bond between the wrapping wire and the tire rubber. Usually, this plating is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C15/04C22C38/38C22C38/00D07B1/06
CPCD07B2201/2024D07B2201/2051D07B2205/305B29D30/48D07B1/062D07B2205/3057C22C38/04B60C15/04D07B2201/2059B60C2015/048D07B2501/2053D07B2201/2023D07B1/144B29D2030/483C22C38/02D07B2205/206D07B2401/2025D07B2201/2006D07B2201/2065D07B2201/2039D07B2801/12D07B2801/18D07B2801/14D07B2801/10B60C15/00
Inventor 冈本贤一笹部博史若原仁志佐野裕一
Owner SUMITOMO ELECTRIC IND LTD
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