Pneumatic radial tire
A technology for radial tires and tires, which is applied to the reinforcement layer of pneumatic tires, tire parts, vehicle parts, etc., can solve the problems of increased shear strain between layers and delamination in the shoulder area, and achieve road noise reduction and reduction Road surface noise, effect of suppressing delamination failure
Inactive Publication Date: 2020-01-10
YOKOHAMA RUBBER CO LTD
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Problems solved by technology
[0004] However, in the case where highly elastic polyethylene terephthalate fiber cords are applied to the belt cover, there is a problem that interlaminar shear between the belt layer and the belt cover Increased strain, especially in the shoulder area of the tread portion prone to delamination (separation) failure
Method used
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[0041] Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings. figure 1 It is a figure which shows the pneumatic radial tire comprised by embodiment of this invention, figure 2 is a diagram showing the belt layer and the belt covering layer thereof, image 3 is a diagram showing its ground shape.
[0042] Such as figure 1 As shown, the pneumatic radial tire according to this embodiment includes a tread portion 1 extending in the tire circumferential direction in an annular shape, a pair of sidewall portions 2 arranged on both sides of the tread portion 1 , and a tire arranged on the sidewall portions 2 . A pair of bead portions 3 on the inner side in the radial direction. A plurality of main grooves 10 extending in the tire circumferential direction are formed in the tread portion 1, but in addition to the main grooves 10, various types of grooves including transverse grooves (Japanese: rag grooves) extending in t...
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Abstract
The present invention provides a pneumatic radial tire capable of effectively reducing road noise while maintaining durability satisfactorily. The pneumatic radial tire is provided with a tread part (1), a pair of side wall parts (2) and a pair of bead parts (3). Furthermore, a carcass layer (4) is provided between the pair of bead parts (3, 3). A plurality of belt layers (7) are disposed on the outer peripheral side of the carcass layer (4) at the tread part (1). A belt covering layer (8) including a plurality of organic fiber cords wound in a spiral shape in the circumferential direction ofthe tire is disposed on the outer peripheral side of the belt layers so as to cover the entire region of the belt layers (7). The organic fiber cords of the belt covering layer (8) are composed of polyethylene terephthalate fiber cords having an elastic modulus of 0.05 N / (tex*%) to 0.09 N / (tex*%) under a 44N load, and the rectangularity of the ground contact shape of the tread part (1) is in the range of 0.85 to 0.98.
Description
technical field [0001] The present invention relates to a pneumatic radial tire using a polyethylene terephthalate (PET) fiber cord as a belt coating. More specifically, it relates to a tire capable of effectively reducing road noise ( roadnoise) pneumatic radial tires. 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 spirally wound in the tire circumferential direction is arranged on the outer peripheral side of the belt layer. Such a belt covering contributes to the improvement of high-speed durability, and also contributes to the reduction of mid-frequency road noise. [0003] Conventionally, nylon fiber cords have been the mainstream organic fiber cords used in belt coverings, but it has bee...
Claims
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IPC IPC(8): B60C9/18B60C19/00
CPCB60C9/18B60C19/002B60C2009/1828
Inventor 中岛美由纪张替绅也
Owner YOKOHAMA RUBBER CO LTD