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Heavy duty tires

A technology for heavy loads and tires, applied to heavy tires, special tires, tire parts, etc., can solve problems such as increased rolling resistance, and achieve the effects of preventing tire weight from increasing, improving wear resistance, and preventing rolling resistance

Active Publication Date: 2020-12-08
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the radius of curvature of the contour of the crown land portion is increased, there is a possibility that the rolling resistance increases due to an increase in the rubber volume on the shoulder land portion side, an increase in tire weight, and a large amount of heat radiation from the shoulder land portion. tendency

Method used

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  • Heavy duty tires
  • Heavy duty tires
  • Heavy duty tires

Examples

Experimental program
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Effect test

Embodiment

[0061] Based on the specifications in Table 1, manufactured with figure 1 The basic structure of the heavy-duty tire of size 12R22.5. As Comparative Example 1, a heavy duty tire having a ratio Rc / Rs of the radius of curvature Rc of the crown profile to the radius of curvature Rs of the shoulder profile Rs of less than 7.0 was manufactured. As Comparative Example 2, a heavy duty tire in which the distance L1 from the tire equator to the junction point was less than 0.70 times the tread half width TWh was manufactured. For each test tire, the wear amount and rolling resistance of the crown land portion were measured.

[0062] Common specifications of the respective test tires are as follows.

[0063] Tire size: 12R22.5

[0064] Rim size: 8.25×22.5

[0065] Tire internal pressure: 800kPa

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Abstract

The present invention provides a heavy-duty tire capable of preventing an increase in rolling resistance and improving the wear resistance of a tread portion. The heavy duty tire is a heavy duty tire (1) having a tread portion (2). On the tire section including the tire rotation axis in the 5% internal pressure state, the profile (20) of the tread portion (2) includes: the crown profile (21) and A pair of shoulder profiles (22). The crown profile (21) and the shoulder profile (22) are circular arcs protruding outward in the radial direction of the tire. The ratio Rc / Rs of the radius of curvature (Rc) of the crown profile (21) to the radius of curvature (Rs) of the shoulder profile (22) is 7.0 or more. The distance (L1) in the tire axial direction from the tire equator (C) to the connection point (23) is at least 0.70 times the tread half width (TWh).

Description

technical field [0001] The present invention relates to a heavy duty tire capable of preventing an increase in rolling resistance and improving the wear resistance of a tread portion. Background technique [0002] For example, in the following Patent Document 1, in order to suppress river wear in the shoulder land portion, a heavy-duty tire is proposed in which the radius of curvature of the contour of the crown land portion is equal to that of the contour of the shoulder land portion. About 1.5 to 2.0 times the radius of curvature. [0003] However, the heavy-duty tire of Patent Document 1 tends to have a large ground contact pressure acting on the crown land portion, and thus tends to quickly wear the crown land portion. On the other hand, it is conceivable to increase the radius of curvature of the contour of the crown land portion to disperse the ground contact pressure acting on the crown land portion over the entire tread portion. [0004] However, when the radius of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/04
CPCB60C11/0327B60C11/04B60C11/042B60C2200/06B60C11/0083Y02T10/86B60C11/1323B60C11/03B60C11/0316B60C11/1656B60C15/0628B60C2001/0058B60C2011/0341B60C2015/0667
Inventor 金谷资辉安宅郁夫键本修司
Owner SUMITOMO RUBBER IND LTD
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