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Pneumatic radial tire for heavy load

A technology for radial tires and treads, which is applied to tire parts, tire treads/tread patterns, transportation and packaging, etc., and can solve the problems of degraded tread contact surface wear resistance, reduction, groove bottom cracking, etc.

Inactive Publication Date: 2011-02-16
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in this tire, in the case where the groove width of the bottom of the lug groove is constant, the groove width of the tread contact surface of the lug groove is relatively increased and thus the amount of rubber of the land portion is relatively reduced, possibly deteriorating Abrasion resistance of the tread contact surface of the contact portion
On the other hand, in the case where the groove width of the lug grooves on the tread contact surface is constant and the width of the groove bottom of the lug grooves is reduced, strain may concentrate on the groove bottom when the tire rotates, which may cause Cracks in the bottom of the tank

Method used

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  • Pneumatic radial tire for heavy load
  • Pneumatic radial tire for heavy load
  • Pneumatic radial tire for heavy load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] prepared respectively with figure 2 and image 3 Block pattern of the construction shown and a radial tire of size 46 / 90R57. For each of the Example tires 1 and 2 according to the present invention and the Comparative example tire in which the characteristics of the tires were changed as shown in Table 1, the sliding amount of the kick-out end portion of the block was measured.

[0065] Since the Comparative Example tires required no change from the Example tires except that the groove walls of the lug grooves should have a conventional structure, the Comparative Example tires were prepared in substantially the same manner as the Example tires.

[0066] Table 1

[0067]

[0068] Each of the Example tires 1 and 2 and the Comparative Example tire was fitted with a rim of 1.45 (m)×0.74 (m) (57 (inch)×29 (inch)) and inflated under an internal pressure of 700 kPa. Each tire was rotated with a load mass of 62000 kg applied thereto, and the amount of sliding of the kick...

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PUM

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Abstract

A pneumatic radial tire for heavy load, provided with lug grooves in side regions of a tread surface, wherein the amount of slip of a kick-out end section of a land section, defined by the lug grooves, relative to a road surface when the tire rolls under a load is reduced without a reduction in the resistance to uneven wear of a road surface land section and without possibility of occurrence of cracks in lug groove bottoms. Lug grooves (2) extending in the lateral direction of the tread and open in side edges of a tread surface (1) are arranged in side regions of the tread surface (1), and a land section (3) is defined between the lug grooves (2). In a lateral cross section of a lug groove (2), only a groove wall (4) on the step-in side of the land section (3) is bent at least one portion thereof which is located in the depth direction of the lug groove (2), and that portion (4a) of the groove wall (4) which is located radially inward of the bend (f) is tilted in the direction in which the width of the groove decreases.

Description

technical field [0001] The present invention relates to a heavy-duty pneumatic radial tire with a designated direction of rotation, and in particular to improved resistance to the contact portion defined by lug grooves in each side region of the tread surface. Partial wear pneumatic radial tire. Background technique [0002] In heavy-duty pneumatic radial tires for vehicles such as construction vehicles suitable for running on unpaved roads, tread patterns having lug grooves in side regions of the tread contact patch have been widely used. [0003] Conventionally, tires of this type are generally designed so that, in a cross-section in the width direction of a lug groove, the angle formed by the groove wall on the step-in side of the land portion and the normal to the surface of the land portion is approximately equal to the angle formed by the The angle formed by the groove wall on the push-out side of the land portion with respect to the normal line of the surface of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/13B60C11/117B60C11/04
CPCB60C2011/0383B60C11/042B60C2011/0313B60C11/1323B60C11/0316
Inventor 青木康年
Owner BRIDGESTONE CORP
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