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Tyre for heavy load

A heavy-duty, tire technology, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve problems such as unsatisfactory results, achieve superior traction performance, and reduce heel and toe wear.

Active Publication Date: 2010-07-28
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the past, in order to balance the traction performance and heel-toe wear, various proposals have been proposed, such as making the lateral groove shallower and conversely making the lateral groove deeper, forming horizontal stripes in the lateral groove, and forming Various schemes such as sipes, but none of them can get very satisfactory results

Method used

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  • Tyre for heavy load
  • Tyre for heavy load
  • Tyre for heavy load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] Based on the specifications shown in Tables 1 and 2, a tire with a size of 11R22.5 and figure 1 The basic pattern shown was heavy-duty tires, and the traction and heel-toe wear resistance of each test tire were tested. In addition, in Example 8, there is no constricted portion on the block and the block width is set constant. In Examples 9 and 13, the lateral groove depth DYc in the sipe forming region of the central lateral groove 5c is , which is less than the lateral groove depth DYm in the sipe forming region of the middle lateral groove 5m.

[0046] (1) traction

[0047] Under the conditions of rim (8.25×22.5) and internal pressure (750KPa), it is installed on the driving wheel of the vehicle (2-DD vehicle), and the timing is measured on the test route on the basalt road surface, from 3-speed idling to full acceleration for 20m The time is represented by an index of 100 in Example 2. The bigger the exponent, the better.

[0048] (2) Resistance to heel and toe w...

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PUM

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Abstract

The invention provides a heavy duty tire comprising at least three rib-like lands (7) where blocks sectioned by longitudinal main grooves (3) in the circumferential direction of the tire and lateral grooves (5) are arranged in the circumferential direction of the tire. The lateral groove (5) is provided, on the bottom (S) thereof, with a sipe forming region (Sy) having a siping (20) of 0.5-2.0 mmwide extending along the center line of the groove. Depth (DY) of the lateral groove (5) in the sipe forming region (Sy) falls within the range of 0.5-0.75 times the depth (H) of the longitudinal main groove (3), and the depth (DS) of the siping (20) falls within the range of 0.75-1.0 times the depth (H) of the longitudinal main groove.

Description

technical field [0001] The present invention relates to a heavy duty tire in which heel and toe wear is suppressed. Background technique [0002] High traction performance is particularly important for heavy-duty tires mounted on the side of the drive shaft. For this reason, the following tread blocks are used on the tread portion, that is, the longitudinal main grooves extending along the tire circumference and the transverse grooves intersecting it are divided into a plurality of block rows. [0003] However, on the other side of the tread block that has excellent traction performance, when running, the end portion (toe portion) on the side that hits the ground first (heel portion) of the block first touches the ground compared to the end portion (toe portion) on the side that lands first. Part) the so-called heel toe wear that wears first. Therefore, in the past, in order to balance the traction performance and heel-toe wear, various proposals have been proposed, such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/04B60C11/11B60C11/12B60C11/13
CPCB60C11/1369B60C11/125B60C11/0309B60C11/12B60C11/0306
Inventor 伊藤邦明
Owner SUMITOMO RUBBER IND LTD