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Heavy loading radial tyre

A technology of radial tires and tires, which is applied to tire parts, reinforcement layers of pneumatic tires, tire edges, etc.

Inactive Publication Date: 2009-09-30
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, such obvious examples occur when the temperature of the bead portion rises excessively under the influence of heat generated by brake pads, etc., thereby causing thermal softening of the rubber

Method used

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  • Heavy loading radial tyre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] Manufacturing has figure 1 , 5 The truck tires (11R22.5) with the structures shown in and 6 and based on the specifications in Table 1 were used for the test, and the bead durability of the sample tires were measured and compared, respectively. Here, specifications not listed in the table are the same for all tires.

[0143] The prior art design is that the wrapping part of the carcass ply is wrapped along the outer side of the bead apex, such as Figure 13 As shown, the height h2 of the hemming part of the ply from the base line of the bead is limited to 65mm.

[0144] (1) Bead durability:

[0145] General bead durability:

[0146] Using a drum testing machine, the tire is driven at a speed of 30km / h under the following conditions: the rim is 7.50×22.5, the internal pressure is 700kPa, and the vertical load is 3 times that of 27.25kN, and the driving time until the bead part is damaged Compared with the travel time of the prior art which is set as 100, the eva...

Embodiment 2

[0154] Manufacturing has figure 1 and 7 The truck tires (11R22.5) of the structure shown and based on the specifications in Table 2 were used for the test, and the bead durability of the sample tires were measured and compared, respectively. Here, specifications not listed in the table are the same for all tires. All other conditions were the same as in Example 1.

[0155] Table 2

[0156] Example 1

[0157] * 1) When starting from the central position No of the abutting area N of the lower surface of the bead core, the radial distance is set to be + on the side of the ply body part 6a and - on the side of the top end Pa, and the central arcuate part is located at (0 mm to + 5mm), the first side arcuate part is in the range of (+10mm to +30mm), and the second side arcuate part is in the range of (-20mm to -30mm). The abutment area N of the lower surface of the bead core is in the range of (-10mm to +10mm).

Embodiment 3

[0159] Manufacturing has figure 1 and 10 - The structure shown in 12 and the truck tires (11R22.5) based on the specifications shown in Table 3 and the truck tires (11R22.5) based on the specifications shown in Table 4 were used for the test respectively, and the samples were measured and compared The bead durability of the tire. Here, specifications not listed in the table are the same for all tires. All other conditions were the same as in Example 1.

[0160] table 3

[0161] Example 1

Example 2

Example 3

current technology

bead structure

Bead wrap

Bead wrap

Bead wrap

Figure 13

curved part

· Distance La

7

7

7

-

·Distance Lb

2

2

2

-

filled with rubber

·Composite elastic modulus

Ea ＊

9

9

9

-

Bead reinforcement

· Cord Te...

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PUM

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Abstract

The present invention relates to a radial truck tire having a bead-wrapped structure. The carcass cords of the carcass extend and incline to one side in the tire circumferential direction, and the other side inclination region, in which the carcass cords of the carcass extend and incline to the other side, has a substantially centered position in the tire axial direction The lowest point of the bead core. Alternatively, the reinforcing ply is inclined as well as the carcass ply. In this way, the carcass ply can be increased or the tightening force of the carcass ply to the bead core can be enhanced, so that the displacement of the carcass ply in the air leakage direction can be effectively restricted. It is also an object to provide a radial truck tire capable of limiting bead damage at the inner end position A.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 200410097098.3, which was submitted to the China Intellectual Property Office on December 24, 2004, entitled "Radial Truck Tire". field of invention [0002] The present invention relates to a radial load tire having improved bead durability while obtaining a lightweight structure when improving the carcass cord wrapping structure of the carcass or reinforcing the cords of the reinforcing cord. Background of the invention [0003] In recent years, it has been proposed to have such Figure 14 A tire of a bead structure (hereinafter referred to as a bead structure) shown in which the hemmed portion a of the carcass ply wraps around the bead core b for approximately one full turn and protrudes from the radially upper surface of the bead core b The end portion a1 of the ply wrap portion a is confined between the bead core b and the bead apex c. For example, Japanese laid-open patent application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C15/00B60C9/08B60C15/06
Inventor 丸冈清人御手洗康男
Owner SUMITOMO RUBBER IND LTD
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