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Pneumatic radial tire

A technology for radial tires and tires, applied to the reinforcement layer of pneumatic tires, tire parts, transportation and packaging, etc., which can solve the problems of increased bite and reduced high-speed durability, so as to prevent damage, improve high-speed durability, The effect of improving durability

Inactive Publication Date: 2012-03-21
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has also been found that if the intermediate elongation is set too small, the road noise will be greatly reduced, but on the other hand, the high-speed durability will be reduced due to the increased bite of the reinforcing cord into the rubber layer.

Method used

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  • Pneumatic radial tire
  • Pneumatic radial tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0030] Make 12 kinds of pneumatic radial tires (embodiment 1~8, conventional example 1,2, comparative example 1~2): its common condition is that tire size is 205 / 50R17, has figure 1 The aspect of the tire structure using polyethylene terephthalate yarn as the reinforcing cord of the belt reinforcing layer; and the length L protruding from the end of the belt reinforcing layer with the largest width after vulcanization molding ( mm) and the intermediate elongation E (%) of the reinforcing cord at a load of 67 N are different as shown in Table 1.

[0031] For these 12 kinds of pneumatic radial tires, road noise and high-speed durability were measured by the following experimental method, and the results were made into an index with the measurement result of the tire of Conventional Example 1 as 100, and were shown in Table 1 (index value Larger means better). As can be seen from the results in Table 1, the tires of Examples 1 to 8 are all excellent in both road noise and high-s...

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Abstract

A pneumatic tire with reduced road noise and improved high-speed durability. In the tire, belt layers (3) are arranged on the outer periphery of a carcass layer (2), and a belt reinforcement layer (4), where reinforcement cords substantially encircle in the circumferential direction of the tire, is provided in the periphery of the belt layer (3). The length (L) of that portion of the belt reinforcement layer (4) that projects from an end portion of the maximum width of the belt layer is 5-20 mm, and an intermediate elongation of the reinforcement cords of the belt reinforcement layer (4) under 67 N load is 1.5-5.5%.

Description

technical field [0001] The present invention relates to a pneumatic radial tire, and more specifically, to a pneumatic radial tire in which road noise is reduced and high-speed durability is improved through improvement of a belt reinforcement layer. Background technique [0002] In general, in a pneumatic radial tire designed for high-speed running, a belt reinforcing layer is arranged on the outer peripheral side of the belt layer arranged inside the tread portion, and the belt reinforcing layer is heat-shrinkable. Nylon cords are wound in a helical shape roughly along the tire circumferential direction. This belt reinforcing layer suppresses swelling of both ends of the belt layer due to centrifugal force during high-speed running, prevents peeling from the rubber layer, and ensures high-speed durability. [0003] Patent Document 1 proposes a proposal that, in a pneumatic radial tire provided with a belt reinforcing layer as described above, by using an organic fiber cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C9/18B60C9/22B60C9/20
CPCB60C9/22
Inventor 桑岛雅俊山根贤司
Owner THE YOKOHAMA RUBBER CO LTD
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