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truck tire

A technology of tires and carcasses, applied in tire parts, reinforcement layers of pneumatic tires, transportation and packaging, etc.

Inactive Publication Date: 2016-08-31
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the stress during running tends to concentrate in the vicinity of the shoulder main groove (e) which has thinner rubber

Method used

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Experimental program
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Embodiment Construction

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 is a cross section of the truck tire 1 according to the present embodiment in a tire meridian section including the tire rotation axis in a standard state. figure 2 Yes figure 1 Enlarged view of tread portion 2 of . image 3 Yes figure 1 A partial enlarged view of the shoulder main groove of .

[0024] "Standard state" means a state where the tire is mounted on a standard rim (not shown) and inflated to a standard pressure but not loaded. Each dimension of a tire is measured in "standard condition" unless otherwise indicated.

[0025] Here, "standard rim" means a rim determined for each tire according to a standard including the standard on which the tire is based, and the standard rim is a standard rim in terms of JATMA, a "Design Rim" in terms of TRA )" and "Measuring Rim (Measuring Rim)" in terms of ETRTO. In addition, "standard internal pressure" me...

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PUM

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Abstract

Provided is a heavy duty tire configured so that the separation of a belt ply occurring on the inside of a shoulder main groove in the radial direction of the tire is prevented. A heavy duty tire comprises a carcass (6), a belt layer (7), a shoulder main groove (9), and belt cushion rubber (10). The belt layer (7) includes first to fourth belt plies (7A-7D). The outer ends (7Ae-7Ce) of the first to third belt plies (7A-7C) are located further toward the outside in the axial direction of the tire than the shoulder main groove (9). The outer end (7De) of the fourth belt ply (7D) is located further toward the inside in the axial direction of the tire than the shoulder main groove (9). The inner end (10e) of the belt cushion rubber (10) is disposed further toward the inside in the axial direction of the tire than the inner edge line (L3) of the shoulder main groove. The cross-sectional area (S) of the inner region (10A) of the belt cushion rubber (10) is in the range from 2.5 mm2 to 20 mm2, inclusive.

Description

technical field [0001] The present invention relates to a truck tire having a tread portion excellent in durability. Background technique [0002] Figure 4 An enlarged cross-sectional view showing a tread portion of a conventional truck tire. The truck tire includes a carcass (a) and a belt (b). The belt (b) includes first, second, third and fourth belt plies (b1-b4) sequentially layered radially outward from the carcass. The radially outermost belt ply b4 has an axial length smaller than those of the other three belt plies ( b1 to b3 ). Further, a belt cushion rubber (c) having a substantially triangular cross-sectional shape is provided between the axially outer end portion of the belt layer (b) and the carcass (a). The belt cushion rubber (c) reduces stress on the ends of the belt layer (b). [0003] The following Patent Document 1 discloses a truck tire characterized in that the distance (d2) between the second and third belt plies (b2, b3) is greater than the dista...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C9/20B60C9/18
CPCB60C9/185B60C9/20B60C9/28B60C2009/1842
Inventor 铃木俊秀
Owner SUMITOMO RUBBER IND LTD