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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 the problems of deterioration of tire durability, deterioration of heat resistance, etc., and achieve the effect of taking into account both tar resistance and heat resistance.

Active Publication Date: 2017-03-22
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the ground contact area of ​​the center block is increased, the heat resistance will deteriorate due to the increase in the block volume, which may lead to a deterioration in the durability of the tire.

Method used

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  • Heavy duty pneumatic tire
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  • Heavy duty pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 17

[0101] Example 17 has the same specifications as Example 14 except that two groove bends (a fourth groove bend and a fifth groove bend) are provided in the central horizontal groove 14 .

Embodiment 18

[0102] Example 18 has the same specifications as Example 17 except that the center transverse groove 14 is a lug groove in which the third straight line 14g of the center transverse groove 14 is not inclined with respect to the tire width direction.

[0103] The tread pattern of the conventional example uses Figure 6 Tread pattern shown. Figure 6 It is a figure which shows the tread pattern of a conventional example. Figure 6 The shown tread pattern includes shoulder lateral grooves 110 , a pair of circumferential main grooves 112 , a central lateral groove 114 , and a central block 116 . The shoulder transverse grooves 110, the pair of circumferential main grooves 112, the central transverse groove 114, and the central block 116 have the same structures as the shoulder transverse grooves 11, 13, the pair of circumferential main grooves 15, 17, the central transverse groove 14, and the central block 21, respectively. , but the groove width of the shoulder transverse groov...

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Abstract

Provided is a heavy duty pneumatic tire having both stone trapping resistance and heat resistance. This heavy duty pneumatic tire is provided with a tread (6) having a tread pattern that includes: shoulder lug grooves (11, 13) extending outward in the width direction of the tire and open at ground contact ends; a pair of circumferential primary grooves (15, 17); center lug grooves (14); center blocks (21) defined by the center lug grooves and the pair of circumferential primary grooves and formed in a row extending in the circumferential direction of the tire; and circumferential secondary grooves (23) extending in the region of the center blocks in the circumferential direction of the tire and open to the center lug grooves adjoining the center blocks. The circumferential secondary grooves each have third groove bends (23a-23d) which extend in the circumferential direction of the tire while being displaced in the width direction of the tire and which are bent in an angled shape or a curved shape. If the width of the circumferential secondary grooves is P4 and the width of the circumferential primary grooves is P1, then the ratio P4 / P1 is in the range of 0.70 to 1.10.

Description

technical field [0001] The present invention relates to a heavy-duty pneumatic tire with a tread pattern. Background technique [0002] As heavy-duty tires mounted on large vehicles such as dump trucks, there are tires in which a plurality of central blocks are provided in the central region of the tread surface in the tire width direction. In such a heavy-duty tire, it is effective to increase the ground contact area of ​​the center block in order to improve the wear resistance and cut resistance in the center region. However, if the ground contact area of ​​the center block is increased, the heat resistance will deteriorate due to the increase in the volume of the block, and the durability of the tire may deteriorate. [0003] As a conventional heavy-duty tire having a plurality of center blocks formed on the tread surface, there is a tire described in Patent Document 1, for example. The heavy-duty tire of Patent Document 1 has, in the tread, at least one circumferential...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/03B60C11/13
CPCB60C11/03B60C2011/0353B60C2011/0346B60C2011/0365B60C2011/0355B60C2011/1361B60C11/0311B60C11/13B60C11/11B60C2200/065B60C2011/0348B60C2011/036
Inventor 佐藤利之角田将瑛浜中英树山口晋均田内梨沙
Owner THE YOKOHAMA RUBBER CO LTD
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