Bead core, production method therefor, and pneumatic tire
A manufacturing method and bead core technology applied to tire parts, tires, bead edges, etc., to achieve excellent shape retention and improve steering stability
Inactive Publication Date: 2020-02-04
BRIDGESTONE CORP
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- Summary
- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
Therefore, in the conventional technology, there is room for improving the shape retention of the bead core and improving the steering stability of the tire.
Method used
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[0040] Hereinafter, embodiments of the present invention will be illustrated in detail with reference to the drawings.
[0041]
[0042] figure 1 It is a schematic partial sectional view in the tire width direction showing a half portion in the tire width direction of a pneumatic tire having the bead core according to the first embodiment of the present invention in the bead portion. exist figure 1 In FIG. 2 , only one half in the tire width direction bounded by the tire equatorial plane CL is shown, and the other half is omitted from illustration, but the other half has the same structure. This pneumatic tire 10 (hereinafter also simply referred to as a tire) includes one or more layers (three layers in the illustrated example) sequentially on the outside in the tire radial direction of the crown portion of the carcass 12 spanning the bead core 1 in an annular shape. The bead core 1 is embedded in the pair of bead portions 11 by a belt 13 and a tread portion 14 constitu...
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Abstract
This bead core is annular and comprises at least one bead wire wound a plurality of times therein. The cross-sectional shape of the bead wire is noncircular. In the axial direction cross-sectional view of the bead core, the bead wire has a plurality of columns formed in the axial direction of the bead core and a plurality of stages formed in the radial direction of the bead core. In the axial direction cross-sectional view of the bead core, the circumference of the bead wire is coated in a resin material and resin material is interposed between each bead wire. This bead core production methodis for obtaining bead cores and comprises: a winding step in which at least one resin-coated wire is wound a plurality of times so as to form a plurality of columns in the axial direction and a plurality of stages in the radial direction, in the cross-sectional view in the axial direction of the obtained bead core, said resin-coated wire being one bead wire having a noncircular cross-section and being coated in a resin material; and a joining step in which resin material in resin-coated wire adjacent as a result of winding is joined. This pneumatic tire comprises a pair of bead sections and comprises the bead core in the pair of bead sections.
Description
technical field [0001] The present invention relates to a bead core, a method for manufacturing the same, and a pneumatic tire. Background technique [0002] The bead core embedded in the bead portion of the pneumatic tire can be formed, for example, by continuously winding one bead wire around a predetermined axis. [0003] Here, when the bead core is formed using the bead wire as described above, it is easy to rotate around the axis with respect to the force of twisting around the axis of the bead wire (the direction in which the bead wire extends). Adjacent bead wires in the cross section of the bead core are in point contact with each other through the covering rubber. Therefore, in particular, when a shearing force is generated in the bead core when a large lateral force is generated, the shape of the bead core may be deformed. Therefore, in the conventional technology, there is room for improving the shape retention of the bead core and improving the steering stabili...
Claims
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IPC IPC(8): B60C15/04B29D30/48
CPCB29D30/48B60C15/04B60C2015/048
Inventor 今誓志河野好秀
Owner BRIDGESTONE CORP