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Pneumatic radial tire for passenger car

A technology for radial tires and passenger cars, applied in the reinforcement layers of pneumatic tires, tire parts, vehicle parts, etc., can solve the problems of unpredictable road noise and reduction, and achieve the effect of improving circumferential rigidity and reducing road noise.

Inactive Publication Date: 2006-03-22
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the belt cover layer composed of the above-mentioned aramid fiber cords contributes to the improvement of driving performance, the effect of reducing road noise cannot be expected at all.

Method used

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  • Pneumatic radial tire for passenger car
  • Pneumatic radial tire for passenger car

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Embodiment Construction

[0012] Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings.

[0013] 1 and 2 are views showing a pneumatic radial tire for a passenger car according to an embodiment of the present invention. In FIG. 1 , 1 is a tread portion, 2 is a sidewall portion, and 3 is a bead portion. A carcass layer 4 is spanned between the pair of left and right bead portions 3, 3, and the end portions in the width direction of the carcass layer 4 are rolled up around the bead core 5 from the tire inner side to the outer side. The carcass layer 4 includes a plurality of cords extending in the tire radial direction.

[0014] On the other hand, a plurality of belt layers 6 , 6 are buried on the outer peripheral side of the carcass layer 4 of the tread portion 1 . These belt layers 6, 6 include a plurality of cords inclined at 10 to 45 degrees with respect to the tire circumferential direction, and the cords are arranged so as to cross each...

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Abstract

A pneumatic radial tire for car capable of effectively lowering road noise by specifying the material characteristics and structure of a belt cover layer formed of aromatic polyamide fiber cords, wherein the belt cover layer formed of the aromatic polyamide fiber cords is disposed on the outer peripheral side of a belt layer and the aromatic polyamide fiber cords are disposed around the tire at an angle of substantially 0 DEG relative to the circumferential direction of the tire, characterized in that the intermediate elongation of the aromatic polyamide fiber cords at a load of 67N is 2.0 to 2.7% and the placing density of the aromatic polyamide fiber cords in the belt cover layer is 36 to 54 pieces / 50 mm.

Description

technical field [0001] The present invention relates to a pneumatic radial tire for passenger vehicles, and more specifically, to a pneumatic radial tire for passenger vehicles that reduces road noise. Background technique [0002] A pneumatic radial tire is equipped with a belt layer having a predetermined cord angle with respect to the tire circumferential direction on the outer peripheral side of the carcass layer of the tread portion, but in order to prevent peeling of the edge portion of the belt layer due to centrifugal force during high-speed running In the case of failure, generally, a belt cover layer in which nylon cords are wound substantially along the tire circumferential direction is disposed on the outer peripheral side of the belt layer. [0003] In addition, as the speed of vehicles increases, the high-speed performance required for tires is also gradually increasing. Since the belt cover layer composed of nylon fiber cords has insufficient strength against ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/20B60C9/22B60C9/00
CPCB60C9/22
Inventor 张替绅也
Owner THE YOKOHAMA RUBBER CO LTD
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