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Heavy duty tire

A technology for tires and carcass, applied in tire parts, reinforcement layers of pneumatic tires, transportation and packaging, etc. The effect of stability

Active Publication Date: 2013-09-25
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of the belt structure described above, there is a tendency for the curvature of the belt to be rounded due to running
As a result, it was found that the belt cushion rubber is softened by mechanical fatigue during running, and thus there is a problem that peeling damage easily occurs between the belt layer and the carcass.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] The size of the trial-produced tire based on the specifications in Table 1 is 11R22.5 and has figure 1 The truck tires of the indicated structure were used, and the weight, breaking energy value, handling stability and durability of each trial tire were measured. The rims used are 7.5×22.5. In addition, for comparison, a conventional tire of the same size (conventional example) having a belt layer composed of four belt plies and a tire composed of three belt plies having a structure not according to the present invention were also trial-manufactured at the same time. (Comparative example), and performance evaluation was performed. The test method is as follows. Here, except for the specifications listed in Table 1, they are actually the same specifications,

[0061] The complex elastic modulus E*b of the buffer rubber 21 is 4.0 MPa,

[0062] The complex elastic modulus E*c of the protective rubber layer 23 is 9.0 MPa,

[0063] The thickness of the protective rubbe...

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PUM

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Abstract

A heavy duty tire comprises a belt disposed radially outside a carcass in the tread portion, and a belt cushion rubber layer inserted between the carcass and each axial edge portion of the belt. The complex elastic modulus of the belt cushion rubber layer is in a range of from 3.5 to 4.5 MPa. The belt is made up of three plies each made of parallel steel cords inclined at an angle of from 15 to 23 degrees with respect to the tire equator. With respect to the tire equator, the inclination of the belt cords of the radially innermost first ply is opposite to that of the middle second belt ply. The second belt ply is narrower than the first belt ply and wider than the radially outermost third belt ply. The ply strengths S1, S2 and S3 of the first, second and third belt plies, respectively, satisfy: (1) S1>S2, (2) S1>S3, (3) 55≰S1≰75, and (4) 1.25≰S1 / S2≰1.65.

Description

technical field [0001] The present invention relates to a truck tire in which the number of belt plies is three, thereby reducing tire weight and cost, and improving tire strength (breaking energy value). Background technique [0002] In the past, such as Figure 4 As shown in (A), the belt layer of the truck tire uses four belt plies in which steel cords are used for the belt cords, and the cords of the first ply A1 on the carcass side with respect to the tire equator The angle θ1 is a relatively large 40-80 degrees. In addition, the cord angles θ2 and θ3 of the second and third cords A2 and A3 on the outside are basically the same in the range of 15-30 degrees. The threads are arranged in a direction crossing the cords of the first and second cords A1 and A2 to form a strong frame structure. [0003] On the other hand, in the following Patent Document 1, the present applicant proposes a truck tire in which the number of belt plies is three to reduce tire weight and cost a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C9/02B60C9/10B60C9/18
CPCB60C9/2006B60C2009/1878B60C2009/1842B60C2009/1864B60C9/185
Inventor 丸冈清人
Owner SUMITOMO RUBBER IND LTD