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Heavy load applied tire

A heavy-duty tire technology, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve the problems of reduced drainage and wet road performance of tires, and achieve improved drainage and durability Stone inclusion performance, friction reduction effect

Inactive Publication Date: 2015-01-14
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, the sawtooth main groove with a small groove width reduces water drainage, and there is a problem that the wet performance of the tire decreases.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0083] Based on the specifications in Table 1 the pair has figure 1 Heavy-duty tires with the shown basic pattern were trial-manufactured, and their rolling performance, wet performance, and stone trapping resistance performance were evaluated.

[0084] In addition, for comparison, based on the specifications in Table 1, a prototype with figure 1 A heavy-duty tire (comparative example) with the basic pattern shown was evaluated in the same manner as in the examples. In addition, Comparative Example 1 did not include a concave portion.

[0085] The main common specifications of tires, etc. are as follows.

[0086] Size: 225 / 80R22.5

[0087] Internal pressure: 900kPa

[0088] Maximum groove width c: 8.3(mm)

[0089] Rim size: 22.5×7.50

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Abstract

The invention discloses a heavy load applied tire which aims firstly to increase the performances of intercalated stone and secondly to increase the rolling performance and road wetting performance. The heavy load applied tire (1) is provided with a tire face part (2). The tire face part (2) is provided with at least a tooth gear ditch (2). The corner part (16) of the tooth gear ditch (3) is connected with a three-fork road (22) formed by horizontal ditches (20, 21). The three-fork road (22) is provided with a concave part (23) arranged at the extended position of the horizontal ditches (20, 21) when they are surpassed by the three-fork road (22). An assumed tooth gear part (24) is continuously arranged at the side of the concave part (23) of the tooth gear ditch (3) in opposite to the three-fork road (22). The distance from the axial direction to the farthest end of the three-fork road is also known as the concave part length (a); the maximum width at the side of the three-fork road (23) of the concave part is defined as b; the maximum ditch width of the horizontal ditches (20, 21) on the side of the three-fork road (22) is defined as c. Their correlation meets the following two formula (1) and (2): 0.5 less a / c less 1.0 (1) and 1.0 less b / c less 1.5 (2).

Description

technical field [0001] The present invention relates to a heavy-duty tire that can achieve both rolling performance and wet road performance, and can improve stone trapping resistance. Background technique [0002] In the following Patent Document 1, a heavy duty tire is proposed in which a zigzag main groove continuously extending in a zigzag shape in the tire circumferential direction is provided in a tread portion. The sawtooth main groove is provided with a corner where the groove wall intersects the tread with an inclined surface at the lobe-side bending portion including the lobe-side inflection point formed by the groove wall protruding toward the center side of the groove width. Excision of the convex side cone face. In addition, in the zigzag main groove, a corner portion where the groove wall and the tread tread meet with an inclined surface is provided at the concave corner side bending portion including the concave corner side bending point where the groove wall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/13B60C11/04
Inventor 五十岚诚
Owner SUMITOMO RUBBER IND LTD