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Flat pneumatic radial tire for heavy duty and method of manufacturing the same

A technology for radial tires and manufacturing methods, which is applied to the reinforcement layer of pneumatic tires, tire parts, tires, etc., can solve the problems of decreased tire durability, incomplete stretching and residual parts of easy-to-elongate parts, and achieve improved durability. Partial wear resistance, durability improvement, durability improvement and handling stability effect

Inactive Publication Date: 2008-06-18
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in steel cords having such a nonlinear stress-strain relationship, after vulcanization molding, the portion that is easy to elongate at the initial stage of stretching may not be completely stretched and partially remain.
Therefore, if the vulcanized tire is filled with internal pressure, the external shape will grow beyond the design size, which will reduce the durability of the tire or deteriorate the steering stability.

Method used

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  • Flat pneumatic radial tire for heavy duty and method of manufacturing the same
  • Flat pneumatic radial tire for heavy duty and method of manufacturing the same
  • Flat pneumatic radial tire for heavy duty and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0049] Embodiment 1~3, comparative example 1, 2

[0050] Manufacture a flat heavy-duty pneumatic radial tire with a tire size of 435 / 45R22.5 and a steel cord belt provided with different belt layers constituting the steel cord belt as described below, thereby manufacturing an implementation Examples 1 to 3 and Comparative Examples 1 and 2 are 5 types of pneumatic radial tires (in addition, the belt layer on the carcass side is the first layer, and the belt layer on the tread side is the second layer, the third layer...).

Embodiment 1

[0052] Layer 1 (0 degree belt layer)

[0053] Belt width: 75% of the total tire width W

[0054] Cord angle: 0 degrees

[0055] Cord structure: 3×(1+5)×0.25mm, 25 ends (end) / 50mm

[0056] Layer 2 (0 degree belt)

[0057] Belt width: 75% of the total tire width W

[0058] Cord angle: 0 degrees

[0059] Cord structure: 3×(1+5)×0.25mm, 25 ends / 50mm

[0060] Layer 3 (slanted belt)

[0061] Belt width: 53% of the total tire width W

[0062] Cord angle: 50 degrees (left tilt)

[0063] Cord structure: 3+9×0.22mm, 21 ends / 50mm

[0064] 4th layer (slanted belt layer)

[0065] Belt width: 48% of the total tire width W

[0066] Cord angle: 50 degrees (right tilt)

[0067] Cord structure: 3+9×0.22mm, 21 ends / 50mm

Embodiment 2

[0069] Layer 1 (0 degree belt layer)

[0070] Belt width: 75% of the total tire width W

[0071] Cord angle: 0 degrees

[0072] Cord structure: 3×(1+5)×0.25mm, 25 ends / 50mm

[0073] Layer 2 (0 degree belt)

[0074] Belt width: 75% of the total tire width W

[0075] Cord angle: 0 degrees

[0076] Cord structure: 3×(1+5)×0.25mm, 25 ends / 50mm

[0077] Layer 3 (slanted belt)

[0078] Belt width: 53% of the total tire width W

[0079] Cord angle: 50 degrees (left tilt)

[0080] Cord structure: 3+9×0.22mm, 21 ends / 50mm

[0081] 4th layer (slanted belt layer)

[0082] Belt width: 48% of the total tire width W

[0083] Cord angle: 50 degrees (right tilt)

[0084] Cord structure: 3+9×0.22mm, 21 ends / 50mm

[0085] Layer 5 (slanted belt)

[0086] Belt width: 29% of the total tire width W

[0087] Cord angle: 20 degrees (right tilt)

[0088] Cord structure: 3×0.20mm+6×0.35mm, 15 ends / 50mm

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Abstract

The invention relates to a flat pneumatic radial tire for heavy loads having a 0-degree belt composed of steel cords, and the durability of the tire is improved. The pneumatic radial tire is equipped with a multi-layer steel cord belt layer (6) on the outer periphery of the carcass layer (4), wherein the steel cord belt layer (6) is composed of at least one 0 degree belt layer (7) and at least two inclined belt layers (8), the cord angle of the 0 degree belt layer relative to the tire circumferential direction is substantially 0 degree, and the cord angle of the inclined belt layer relative to the tire circumferential direction It is a substantially balanced angle in the range of 45 to 65 degrees. A tire vulcanized and molded in a metal mold is released from the mold, assembled to a rim at a high temperature, inflated, and cooled to normal temperature in the inflated state to produce the tire.

Description

technical field [0001] The present invention relates to a flat pneumatic radial tire for heavy loads and a manufacturing method thereof, and more specifically, to a flat pneumatic radial tire for heavy loads capable of further improving durability and partial wear resistance, and improving handling stability, and the same Manufacturing method. Background technique [0002] In recent years, not only pneumatic radial tires for passenger cars but also pneumatic radial tires for heavy loads have been flattened, and ultra-flat tires with a roundness of less than 60% have been increasing. The ultra-flat pneumatic radial tires for heavy-duty trucks are widely appearing in the Japanese market starting with low-floor buses. In order to fully exhibit the running performance of such an ultra-flat radial tire, an important issue is how to bring the wide tread into contact with the road surface in a uniform state. That is, if the ground contact performance of the tread is not uniform, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/18B29C33/02B29C35/16B29D30/06B60C9/20B60C9/22
Inventor 加部和幸伊藤武比古矶部哲小川幸博
Owner THE YOKOHAMA RUBBER CO LTD
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