Pneumatic radial tire
A radial tire, tire circumferential technology, applied in the reinforcement layer of pneumatic tires, tire parts, vehicle parts, etc., can solve the problems of belt cover delamination, poor belt edge, delamination, etc., to prevent warping The effect of reducing the mid-frequency road noise and improving the durability
Active Publication Date: 2021-08-17
THE YOKOHAMA RUBBER CO LTD
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Problems solved by technology
[0003]
On the other hand, when a highly elastic PET fiber cord is used for the belt cover layer, the interlayer shear strain becomes large at the shoulder portion where the amount of deformation is large, and delamination of the belt cover layer tends to occur. tendency
Moreover, when the bending rigidity of the steel cord used for the belt layer is high, there is a possibility that the belt may be generated due to poor splicing (English: splice) caused by the warping of the end portion of the belt layer generated in the cutting process. edge delamination
Method used
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Embodiment
[0036] The tire size is 225 / 60R18, with figure 1 The illustrated basic structure, the structure of the steel cord constituting the belt layer, the number of implanted steel cords, and the width in the direction perpendicular to the longitudinal direction of the steel cord per 50 mm as shown in Tables 1 and 2 The bending stiffness S of each belt layer, the straightness of the wire constituting the inner layer of the steel cord, the type of organic fiber used in the organic fiber cord constituting the belt cover layer, and the 2.0cN / dtex of the organic fiber cord Tires of Conventional Example 1, Comparative Examples 1 to 3, and Examples 1 to 9 having different elongation under load.
[0037] In any case, the belt covering layer has a belt formed by aligning one organic fiber cord (nylon 66 fiber cord or PET fiber cord) and covering it with a covering rubber in a spiral shape along the tire circumferential direction. Coiled seamless construction. The cord implantation density i...
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Abstract
Provided is a pneumatic radial tire which is provided with a belt cover layer composed of organic fiber cords and can have improved durability while reducing road noise effectively. A pneumatic radial tire, in which a plurality of belt layers 7 are arranged on the outer peripheral side of a carcass layer 4 in a tread part 1 and a belt cover layer 8 comprising a plurality of organic fiber cords that are wound spirally along the tire peripheral direction is arranged on the outer peripheral side of the belt layers, wherein the belt layers 7 are composed of steel cords 7C that are arranged inclined relative to the tire peripheral direction so as to intersect each other between the layers, the flexural rigidity S of each of the belt layers 7 per a width of 50 mm as measured in a direction orthogonal to the length direction of the steel cords 7C is preset to 16500 Nmm2 / 50 mm or less, the belt cover layer 8 is composed of organic fiber cords each having an elongation of 2.0 to 4.0% under the application of a load of 2.0 cN / dtex, and the organic fiber cords are wound spirally along the tire peripheral direction.
Description
technical field [0001] The present invention relates to a pneumatic radial tire provided with a belt covering layer made of organic fiber cords, and more specifically, to a pneumatic radial tire capable of improving durability while effectively reducing road noise. Background technique [0002] In a pneumatic radial tire for passenger cars or small trucks, a carcass layer is spanned between a pair of bead portions, and a multilayer belt layer is arranged on the outer peripheral side of the carcass layer at the tread portion. A belt covering layer including a plurality of organic fiber cords wound helically in the tire circumferential direction is arranged on the outer peripheral side of the belt layer. Nylon fiber cords are the mainstream of organic fiber cords used in such belt coverings, but in recent years, the use of polyethylene terephthalate, which is highly elastic and inexpensive compared to nylon fiber cords, has been proposed. Glycol ester fiber cord (hereinafter ...
Claims
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IPC IPC(8): B60C9/00B60C9/18B60C9/22
CPCB60C9/22B60C9/2009B60C2009/2074B60C2009/2096B60C2009/2093B60C9/0007B60C9/0042B60C2009/2083B60C2009/2077
Inventor 藤森弘章张替绅也
Owner THE YOKOHAMA RUBBER CO LTD