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 achiev

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

Example Embodiment

[0100] Example 1

[0101] Get to have figure 1 The basic structure is shown, and the heavy-duty pneumatic tire of Example 1 having the specifications shown in Table 1 below. The size of the tire is 12R22.5. The ratio (P1A / P1B) of the average contact pressure P1A of the outer contact surface of the shoulder land portion to the average contact pressure P1B of the inner contact surface is 0.90. The ratio (BW / TW) of the width BW of the belt layer to the width TW of the tread is 0.98. The complex elastic modulus E1A of the cushion body is 5.70 MPa. The loss tangent L1A of this buffer body is 0.115. The complex elastic modulus E1B of the main body is 5.10MPa. The body's loss tangent L1B is 0.075. The ratio of the thickness H1A of the shock absorbing body to the thickness H1 of the shoulder land portion is 0.33. The ratio of the width W1A of the cushion body to the width W1 of the shoulder land portion is 0.50.

Example

[0102] Example 2-3 and Comparative Example 1-2

[0103] Except for setting the ratio (P1A / P1B) in accordance with Table 1 below, a tire was obtained in the same manner as in Example 1.

Example

[0106] Example 4-5 and Comparative Example 8-9

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

[0108] The occurrence of partial wear and the amount of wear1

[0109] Install the test tire on a high-speed bus. The size of the rim is 8.25×22.5. The internal pressure of the tire is adjusted to 800kPa. In the fully loaded state, the high-speed bus traveled 30,000 km. After driving, the occurrence of uneven wear of the tire mounted on the front wheel was visually observed, and the amount of wear of the shoulder land portion of the tire was measured. The results are shown in Table 1 to Table 3 below. In the table, it is indicated by "D" if the shoulder defect or step wear is confirmed, and it is indicated by "-" if it is not confirmed.

[0110] Fuel consumption performance

[0111] The average fuel consumption (travel distance per 1 liter of gasoline) of 5 high-speed b...

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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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