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Heavy duty pneumatic tire

A technology for pneumatic tires and heavy loads, applied in the field of pneumatic tires for heavy loads, can solve problems such as difficulty in achieving low fuel consumption and wear resistance, and achieve improved low fuel consumption, uneven wear resistance, and excellent uneven wear resistance. Effect

Inactive Publication Date: 2013-09-11
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In heavy-duty tires, it is difficult to achieve both low fuel consumption and wear resistance

Method used

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  • Heavy duty pneumatic tire
  • Heavy duty pneumatic tire
  • Heavy duty pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] get to have figure 1 A pneumatic tire for heavy loads according to Example 1 having the basic structure shown in Table 1 below. The size of the tire is 12R22.5. The ratio (P1A / P1B) of the average ground contact pressure P1A of the outer contact patch of the shoulder land portion to the average contact contact pressure P1B of the inner contact patch was 0.90. The ratio (BW / TW) of the width BW of the belt to the width TW of the tread was 0.98. The complex elastic modulus E1A of the buffer is 5.70 MPa. The loss tangent L1A of this buffer was 0.115. The complex elastic modulus E1B of the main body is 5.10 MPa. The loss tangent L1B for this subject is 0.075. The ratio of the thickness H1A of the shock absorber to the thickness H1 of the shoulder land portion was 0.33. The ratio of the width W1A of the shock absorber to the width W1 of the shoulder land portion is 0.50.

Embodiment 2-3 and comparative example 1-2

[0103] Tires were obtained in the same manner as in Example 1 except that the ratio (P1A / P1B) was set in accordance with Table 1 below.

Embodiment 4-5 and comparative example 8-9

[0107] Tires were obtained in the same manner as in Example 1 except that the ratio (H1A / H1) and the ratio (W1A / W1) were set in accordance with Table 3 below.

[0108] Occurrence of partial wear and amount of wear 1

[0109] Install the test tires on high-speed buses. The rims measure 8.25×22.5. The internal pressure of the tire was adjusted to 800 kPa. Under full load, the high-speed bus has traveled 30,000 km. After running, the state of occurrence of partial wear of the tire mounted on the front wheel was visually observed, and the wear amount of the shoulder land portion of the tire was measured. The results are shown in Tables 1 to 3 below. In the table, "D" is indicated when shoulder chip wear or step wear is confirmed, and "-" is indicated when it is not confirmed.

[0110] Fuel consumption performance

[0111] The average fuel consumption (distance traveled per 1 liter of gasoline) was measured for 5 high-speed buses traveling 30,000 km. The average values ​​the...

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Abstract

The invention provides a heavy duty pneumatic tire with low oil consumption and excellent uneven wear resistance. The tire has a belt and a tread such that ratio of width of the belt to width of the tread is greater than or equal to 0.95 and is not greater than 1.0. The tread has shoulder land portions on outer sides in axial direction, each shoulder portion has a cap layer including a body portion and a pad, the pad has complex elastic modulus greater than complex elastic modulus of the body portion, the body portion has loss tangent less than loss tangent of the pad, and each shoulder portion has ground-contact surface which has outer and inner ground-contact surfaces separated by boundary between the body portion and pad such that ratio of average ground-contact pressure of the outer ground-contact surface relative to average ground-contact pressure of the inner ground contact surface is greater than or equal to 0.85 and is not greater than 0.95.

Description

technical field [0001] The present invention relates to a pneumatic tire for heavy loads. Background technique [0002] The tread of the tire is formed from cross-linked rubber. The outer surface of the tread forms the tread surface. The tread surface is in contact with the road. [0003] A tread generally has a base layer and a top layer radially outward of the base layer. For the top layer, cross-linked rubber with excellent wear resistance, heat resistance and grip is usually used. [0004] Generally, a plurality of main grooves extending in the circumferential direction are engraved on the tread of a heavy-duty pneumatic tire mounted on a truck, a bus, or the like. Accordingly, a plurality of land portions aligned in the axial direction are formed on the tread. Usually, the land portion is composed of a rib portion extending in the circumferential direction or a plurality of blocks arranged in the circumferential direction. [0005] In the tread of this tire, uneve...

Claims

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Application Information

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IPC IPC(8): B60C11/00B60C11/04B60C11/11
CPCB60C11/0306B60C1/0016B60C11/0058B60C2011/0025B60C2011/0033B60C2200/06
Inventor 冈部太郎
Owner SUMITOMO RUBBER IND LTD
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