Tire

A technology for tires and tire crowns, applied in the field of off-road driving, can solve the problems of decreased rigidity and poor wear resistance, and achieve the effect of increased rigidity and improved wear resistance

Active Publication Date: 2020-05-26
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, according to this method, the rigidity in the tire circumferential direction of the tread portion may decrease, and the wear resistance may deteriorate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0104] Based on the specifications in Table 1, prototypes have figure 1 The size of the basic pattern is 35×12.50R20LT tires, and the wear resistance and traction performance of each tested tire are tested. The depth of the middle transverse groove is 14.6mm, the depth of the shallow groove is 7.3mm, and the depth of the sipe at the bottom of the groove is 3.7mm. The test method is as follows.

[0105]

[0106] The tester comprehensively evaluates the groove depth and the presence or absence of partial wear in the following cases, that is, each test tire assembled on a 20×10J rim is filled with an internal pressure of 450kPa, and installed in a four-wheel drive with a displacement of 3500cc ( 4wheel drive (4WD) pickup truck vehicle, the groove depth and the presence or absence of partial wear after driving 100,000km on the paved road. The results are represented by an index with Example 1 being 100, and the larger the numerical value, the better the wear resistance.

[01...

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PUM

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Abstract

The invention provides a tire capable of improving traction performance during cross-country while maintaining wear resistance. The tire (1) includes, in a tread portion (2), a pair of shoulder main grooves (4), a crown region (11) between the shoulder main grooves (4), and shoulder regions (12) disposed outside of the shoulder main grooves (4) in a tire axial direction. Land ratios of the crown region and the shoulder regions are respectively 40%-60%. In the crown region (11), a plurality of middle blocks (21) are arranged on both sides of a tire equator (C), and each middle block (21) has alongitudinal shape in which a length (L2) in the tire circumferential direction is larger than a length (L1) in the tire axial direction.

Description

technical field [0001] The present invention relates to a tire suitable for off road (rough terrain) driving. Background technique [0002] In tires that are supposed to be used for off-road driving, the following methods can be adopted: increasing the volume of the groove in the ground contact surface, which is easy to trap mud, sand, snow, etc. (hereinafter referred to as mud, etc.), or increasing the vertical direction relative to the direction of travel. The edge (edge) component on the surface increases the scratch effect, thereby improving the traction (traction) performance. More specifically, a method of thickening the protruding grooves extending in the tire axial direction, or increasing the number of protruding grooves; or increasing sipes extending in the tire axial direction (for example, see Patent Document 1). [0003] However, according to this method, the rigidity of the tread portion in the tire circumferential direction may decrease, and the wear resista...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B60C11/03B60C11/12B60C11/01
CPCB60C11/03B60C11/1259B60C11/1272B60C11/01B60C2011/013B60C2011/1268B60C2200/14B60C2011/133B60C11/125B60C11/1392B60C11/1376B60C11/033B60C11/12B60C2011/0351B60C11/1307B60C11/0309Y02T10/86B60C11/11B60C11/1204B60C2011/0365B60C2011/1213B60C2011/1209B60C2011/0362B60C2011/0367B60C2011/0346
Inventor伊藤翔星野隆文
OwnerSUMITOMO RUBBER IND LTD