Pneumatic tire

A technology of pneumatic tires and tires, which is applied to the reinforcement layer of pneumatic tires, heavy-duty tires, special tires, etc., can solve tire difficulties and other problems, and achieve the effects of suppressing groove cracking, significant groove cracking resistance, and strain reduction

Inactive Publication Date: 2009-09-23
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to manufacture tires in which the radius of curvature of the carcass lines is locally reduced in this way.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] figure 1 It is a sectional view showing the tire meridian direction of the pneumatic tire according to Example 1 of the present invention. figure 2 yes means figure 1 An explanatory diagram of the action of the described pneumatic tire. image 3 as well as Figure 4 yes means figure 1 This is a different graph of the described pneumatic tire due to each aspect ratio. Figure 5 as well as Figure 6 It is a graph showing the results of performance tests of pneumatic tires according to Examples of the present invention.

[0049] [Pneumatic tire]

[0050] Pneumatic tire 1 comprises: bead core 2, carcass ply 3, belt layer 4, tread rubber 5 and sidewall rubber 6 (refer to figure 1 ). The bead core 2 has an annular structure, and a pair of left and right bead cores 2 constitute a set. The carcass ply 3 is spanned annularly between the left and right bead cores 2 , 2 to constitute a skeleton (structure) of the tire. The belt layer 4 is composed of a plurality of lami...

Embodiment 2

[0073] Figure 7 It is a graph showing the difference due to each aspect ratio of the pneumatic tire according to Example 2 of the present invention. Figure 8 It is an explanatory diagram showing a carcass thread of a pneumatic tire according to Example 2 of the present invention. Figure 9 It is an explanatory diagram showing the operation of the pneumatic tire according to the second embodiment of the present invention. Figure 10 as well as Figure 11 It is a graph showing the results of performance tests of pneumatic tires according to Examples of the present invention.

[0074] In the pneumatic tire 1 of this Example 2, compared with the pneumatic tire 1 of Example 1, it is characterized in that, in the cross-sectional shape (carcass line) of the carcass ply 3 viewed from a section in the tire meridian direction, a predetermined The size ratios USH / HA, WB / HA, WC / WB are defined by a predetermined quadratic approximation.

[0075] Specifically, first, the distance USH ...

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Abstract

A pneumatic tire (1) satisfying relationships of 48[%]<=HB / HA<=52[%], 98[%]<=HC / HA<=100[%], 108[%]<=WB / WA<=115[%], and 55[%]<=WC / WA<=75[%] in a cross-section in the meridional direction of the tire when it is held as a single unit such that the width of a tire base is not less than 100% and not more than 120% of the width of an applicable rim, with WA the width half the width of the tire base, WB the distance from the Y-axis to the maximum width point P of a carcass layer (3), WC the distance from the Y-axis to an inflection point Q of the carcass layer (3), HA the distance from the X-axis to the top point R of that portion of the carcass layer (3) which is at a center crown CL, HB is the distance from the X-axis to the maximum width point P of the carcass layer (3), and HC the distance from the X-axis to the inflection point Q of the carcass layer (3).

Description

technical field [0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire capable of suppressing the occurrence of groove cracks. Background technique [0002] There has been a problem that, in a heavy-duty pneumatic tire having a low flatness ratio, groove cracks (cracks at the bottom of the groove) occur in the circumferential main grooves on the outer side in the tire width direction. [0003] As a conventional pneumatic tire related to this problem, the technique described in Patent Document 1 is known. Conventional pneumatic tires (pneumatic tires for heavy loads) include: a carcass ply whose end portions are folded around paired bead cores; Belt, a tread arranged on the outer peripheral side of the belt, and a plurality of circumferential grooves formed on the tread contact surface and continuous in the circumferential direction; wherein, when assembled on a standard rim and filled with the highest air In the state of air pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/08B60C9/28B60C3/04
CPCB60C3/04B60C9/28B60C9/0292B60C2200/06Y10T152/10765Y10T152/10495
Inventor 丸山博功矶部哲小林弘典
Owner THE YOKOHAMA RUBBER CO LTD
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