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Pneumatic Radial Tire

A technology for radial tires and bead parts, applied to pneumatic tires, reinforcement layers of pneumatic tires, tire parts, etc., can solve problems such as single-strand steel wire breakage and tire durability degradation

Inactive Publication Date: 2014-08-27
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the single-strand steel wire is used as it is for the reinforcing cord of the belt layer, for example, when the tread portion is bent with the circumferential main groove as the boundary, the single-strand steel wire may be broken, There is a problem of decreased tire durability

Method used

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  • Pneumatic Radial Tire
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  • Pneumatic Radial Tire

Examples

Experimental program
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Embodiment

[0059] Tires of Conventional Example 1, Comparative Examples 1-7, and Examples 1-24 were produced, all of which were pneumatic radial tires, the tire size was 195 / 65R15, and a plurality of reinforcing curtains were provided on the outer peripheral side of the carcass layer of the tread portion. The belt layer is formed by burying the threads in the rubber, and the belt protection layer composed of nylon 66 fiber cords is provided on the outer peripheral side of the belt layer, and the structure of the reinforcing cords of the belt layer , wire surface torsion angle θ, bare wire diameter d, surface residual stress σ, implant density, wire gap, total cross-sectional area of ​​wire per 50mm width, tensile stiffness per 50mm width, out-of-plane bending stiffness per 50mm width, and The twisted structure of the belt protection layer was set as shown in Tables 1 to 5. For the twisted structures of the belt protection layers in Tables 1 to 5, "dtex" is represented by "T".

[0060] T...

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Abstract

Provided is a pneumatic radial tire comprising a belt layer that is formed by aligning a plurality of single-line steel wires (10) and embedding the steel wires in rubber. The pneumatic radial tire maintains good tire durability while enabling reduced rolling resistance, and is provided with: a pair of bead sections; a pair of side wall sections; and a tread section in which the belt layer, said belt layer being formed by aligning a plurality of single-line steel wires (10) and embedding the steel wires in rubber, is provided between the pair of side wall sections on the outer peripheral side of a carcass layer in the tread section, said carcass layer being mounted between the pair of bead sections. The strand diameter of the single-line steel wire (10) is 0.30-0.40 mm. Each single-line steel wire (10) is provided with axial torsion. The wire surface torsion angle (theta) with respect to the axial direction of the single-line steel wire (10) is 1°-15°. The surface residual stress of the single-line steel wire (10) is less than 0 MPa.

Description

technical field [0001] The present invention relates to a pneumatic radial tire including a belt layer formed by embedding a plurality of single-strand steel wires aligned in rubber. Background technique [0002] Conventionally, as a reinforcing cord for a belt layer of a pneumatic radial tire, a steel cord obtained by twisting a plurality of monofilaments (filament) has been used. However, due to the internal voids formed between the monofilaments, the cord diameter of the steel cord made by twisting a plurality of monofilaments increases, and a large amount of coating rubber is required accordingly, so the rolling resistance of the pneumatic radial tire decreases. Easy to increase. [0003] Then, in order to reduce the rolling resistance of the pneumatic radial tire by reducing the covering rubber of the belt layer, it has been proposed to use single-strand steel wires as the reinforcing cords of the belt layer (for example, refer to Patent Documents 1 to 3). Here, in or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/22B60C9/20
CPCB60C9/2009B60C9/20B60C2009/2214B60C9/22B60C2009/2077B60C2009/2096B60C2009/208B60C2009/2074B60C2009/2051B60C9/0007B60C9/0064B60C9/2006B60C2009/0071B60C2009/0092B60C2009/2048B60C5/00
Inventor 柿沢宽志上田佳生
Owner YOKOHAMA RUBBER CO LTD
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