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Pneumatic tire and method for producing pneumatic tire

A technology for pneumatic tires and tire width direction, applied in tire parts, tires, tire edges, etc., can solve the problems of increasing the bead core pressure and the durability deterioration of the carcass ply, reducing stress concentration and preventing durability. The effect of sexual deterioration

Inactive Publication Date: 2014-04-09
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, when the tire is used in a state of an undesirably high internal pressure or an undesirably heavy load, the pressure at the corners of the bead core is increased, so that the stress of the carcass ply is concentrated, thereby making the carcass ply The durability of the layer is more degraded

Method used

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  • Pneumatic tire and method for producing pneumatic tire
  • Pneumatic tire and method for producing pneumatic tire
  • Pneumatic tire and method for producing pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0076] Pneumatic tires according to the present invention were trial-manufactured to evaluate performance in the following manner.

[0077] Example tires were manufactured in sizes 11.00R20 and 12.00R20 and conventional tires were manufactured in sizes 11.00R20 and 12.00R20

[0078] Example tire 1 with size 12.00R20 has the same figure 1 with figure 2 The same features as the tire 1 shown in . Two layers of organic fiber reinforcement are formed around the bead core of the tire. The organic fiber cords of the organic fiber reinforcement layer are made of nylon. The angle of intersection between the cords in the inner reinforcement layer and the cords in the outer reinforcement layer was 100 degrees.

[0079] Such as Image 6 As shown in (a), the bead core of Example tire 1 was formed by repeatedly winding a cord to form nine segments. The number of rows in each segment from the innermost section to the outermost section in the tire radial direction increases and decrea...

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Abstract

This pneumatic tire is equipped with: a pair of annular bead cores embedded and disposed at a bead section; a carcass comprising a main body section extending toroidally between the pair of bead cores, and at least one carcass ply having a fold-back section that, continuously with the main body section, results from folding back around the bead core; and a tread rubber installed at the outer perimeter of the crown region of the carcass. The cross sectional shape in the widthwise direction of the tire of the bead cores is polygonal having at least one corner at the main body side of the carcass ply. At the periphery of the bead cores, at least a two-layered stack of organic fiber reinforcing layers is provided resulting from helically winding at least one rubber-covered organic fiber cord inclined with respect to the center line of the transverse plane of the bead cores; the respective organic fiber cords of organic fiber reinforcing layers that are adjacent in the inner / outer direction are caused to extend in mutually intersecting orientations with respect to the center line of the transverse plane of the bead cores, and of the organic fiber reinforcing layers that are adjacent in the inner / outer direction, in the inner organic fiber reinforcing layer, the rubber-covered organic fiber cord is wound leaving a gap in the peripheral direction of the tire at at least a portion thereof without overlapping in the peripheral direction of the tire, and the outer organic fiber reinforcing layer is providing in a manner so as to cover at least a portion of the gap.

Description

technical field [0001] The present invention relates to a pneumatic tire comprising: a pair of annular bead cores buried and arranged in bead portions; A carcass layer is formed, the main body portion extends annularly between the pair of bead cores, the turnback portion is turned back around the bead cores; and the tread rubber is arranged on the outer peripheral side of the crown region of the carcass, in the tire width direction In cross section, the bead core has a polygonal shape, and the polygonal shape has at least one corner on the main body portion side of the carcass ply. In particular, the invention relates to heavy duty tires preferably used for trucks or buses. The present invention also relates to a method of manufacturing a pneumatic tire. In particular, the present invention proposes a technique of reducing the stress concentration of the carcass ply caused by the corner portion of the bead core and preventing the durability of the carcass ply from deteriorat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C15/04B29D30/50
CPCB29D30/50B60C2015/044B60C15/04Y10T152/10819
Inventor 三田庆一
Owner BRIDGESTONE CORP
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