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pneumatic tire

A technology for pneumatic tires and treads, applied in the direction of pneumatic tires, heavy tires, tire parts, etc., can solve the problems of reducing the volume of tread rubber, reduce the amount of slip deformation, improve wet road performance, and improve durability Attrition effect

Active Publication Date: 2017-06-16
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, after controlling the maximum depth of the circumferential groove equipped with the wear indicator to be relatively shallow as the lower limit value specified by Engineering Design Information (EDI) which is a compliance guideline of the Japan Automobile Tire Manufacturers Association (JATMA) In the case of relatively reducing the volume of the tread rubber in order to reduce the direct material cost and relatively improving the rigidity of the blocks defined on the tread surface, the tire having the above-mentioned structure is still unavoidable due to the decrease in the absolute value of the allowable wear Faced with insufficient wear resistance and short wear life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0108] Test 1 will be described below.

[0109] change has Figure 5 The pitch length of each block in the tire with the tread pattern shown in , to obtain Example Tire 1 to Example Tire 3 including blocks with pitch lengths of 45.8 mm, 58.4 mm, and 65.8 mm, respectively. None of Example Tire 1 to Example Tire 3 was provided with any sipes and each included circumferential grooves 3 and 4 having a maximum depth of 16.2 mm. to have Image 6 The tire with the tread pattern shown in is used as a comparison, and the wear energy index of the tire under the following conditions is obtained: the tire rolls freely, the situation of inputting a front-rear direction acceleration of 0.05G to the tire, and the case of inputting a front-rear direction acceleration of 0.15G to the tire Case. Figure 7 The results of Example tire 1 to Example tire 3 are shown.

[0110] Here, the maximum depth of the circumferential grooves included in the tread central region of the comparative tire was ...

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Abstract

An object of the present invention is to provide a pneumatic tire in which wear resistance is effectively improved and a high wear life can be obtained even under usage conditions in which input to the tire is increased. In the pneumatic tire according to the present invention, the block (11) has a block width gradually increasing from the circumferential end side of the block (11) to the circumferential center side of the block. The widthwise end portions of the two end portions (10) located in the tread width direction of the block are arranged at the circumferential middle portion of the block (11), and the maximum circumferential length of the block (11) is longer than that of the block ( 11) The maximum width is long. The planar outline shape of the block (11) is a pentagon or a polygon with more than five sides including end sides (11a) located at both ends in the circumferential direction. From the circumferential midpoint position (11b) of the end edge (11a) of the block (11) to the circumferential midpoint position (10a) of the line segment (L) connecting the width direction ends (10) of the block (11) to each other The circumferential distance (a, a1) is 2 or more times the maximum depth of the circumferential groove.

Description

technical field [0001] The present invention relates to a pneumatic tire suitable for use in heavy-duty vehicles such as trucks and buses. Background technique [0002] Conventional tires of this type aimed at improving wear resistance include the tire disclosed in Patent Document 1. [0003] In order to enhance wear resistance by optimizing the shape and position of the block land portion, Patent Document 1 discloses a tire "which has a plurality of circumferential grooves extending in the tire circumferential direction and a plurality of A plurality of rows of pattern block land portions formed by dividing and forming transverse grooves communicating with two adjacent circumferential grooves; at least two rows of pattern block land portions adjacent to each other sandwiching circumferential grooves among the plurality of rows of pattern block land portions In the section, each row of block land portions is arranged to be shifted relative to each other in the tire circumfe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/11B60C11/04B60C11/12B60C11/13
CPCB60C2200/06B60C11/0306B60C2011/036B60C2011/0346B60C2011/1209B60C11/1236B60C2011/0353B60C2011/0365B60C2011/0355B60C11/11B60C5/00B60C11/0311B60C11/04B60C11/125B60C11/1263B60C11/1281
Inventor 大川直广红林真之
Owner BRIDGESTONE CORP