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Pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire treads/tread patterns, vehicle parts, etc., can solve the problems of wet performance and snow performance reduction, and achieve the effect of inhibiting wear and reducing rigidity

Inactive Publication Date: 2009-04-01
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But when worn, the sipe 100 at the opening part disappears (refer to Figure 9C ), wet performance and snow performance are reduced, and it is difficult to make uneven wear coexist with wet performance and snow performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0073] Hereinafter, the pneumatic tire 10 according to the first embodiment of the present invention will be described in detail with reference to the drawings.

[0074] like figure 1 As shown, the tread 12 of the pneumatic tire 10 according to this embodiment is provided with a plurality of blocks 18 defined by the circumferential main groove 14 and the lateral groove 16 .

[0075] In the present embodiment, the sipe 20 extending in the tire axial direction (arrow L direction and arrow R direction) is formed on the outermost block 18 in the tire axial direction.

[0076] In the present embodiment, one end of the sipe 20 is opened at the block end of the block 18 outside in the tire axial direction, and the other end is terminated inside the block 18 .

[0077] Accordingly, the pneumatic tire 10 of the present embodiment does not have a directional pattern when mounted on a vehicle.

[0078] As shown in Figure 2, the sipe 20 extends in a zigzag shape along the tire axis dir...

no. 2 Embodiment approach

[0098] Below, follow image 3 A pneumatic tire 10 according to a second embodiment of the present invention will be described. In addition, the same code|symbol is attached|subjected to the same structure as 1st Embodiment, and description is abbreviate|omitted.

[0099] like image 3 As shown, in the pneumatic tire 10 according to the present embodiment, the main groove opening side of the sipe 20 is all on the outside of the vehicle (the side in the direction of the arrow OUT. In addition, the direction of the arrow IN indicates the inner direction when the vehicle is mounted). , specifies the orientation of the sipe 20 and the direction of vehicle installation.

[0100] (effect)

[0101] When the vehicle turns, although the ground area moves toward the vehicle outer side, a lateral force is also input to the tread block 18 on the vehicle inner side, and this lateral force is not as large as that input to the tread block 18 on the vehicle outer side.

[0102] Therefore, ...

no. 3 Embodiment approach

[0104] Next, a pneumatic tire 10 according to a second embodiment of the present invention will be described with reference to FIG. 4 . In addition, the same code|symbol is attached|subjected to the same structure as the above-mentioned embodiment, and description is abbreviate|omitted.

[0105] As shown in FIG. 4 , in the pneumatic tire 10 according to the present embodiment, the sipe 20 traverses the block 18 in the tire axial direction (arrow L direction and arrow R direction). Thus, a higher edge effect can be obtained compared to the case where the sipe 20 does not cross the block 18 .

[0106] Thus, when both end portions of the sipe 20 are respectively opened on the main groove side, it is preferable to set the rigidity index F on both sides to be greater than the rigidity index F on the central side.

[0107] Therefore, in the present embodiment, the sipe swing widths φ1 and φ2 on both sides are set to be larger than the central sipe swing widths φ1 and φ2.

[0108] ...

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PUM

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Abstract

A pneumatic tire enabling both biased abrasion and performances on wet and snow surfaces to be compatible with each other, wherein a sipe (20) with a specified depth extending zigzag in the axial and depth directions of the tire is formed in a block (18). The sipe (20) is characterized in that a rigid index F shown below varies in the longitudinal direction of the sipe. Rigid index F = (1 + Phi1) (1 + Phi2) (1 + Phi3). Phi1: Amplitude (mm) of sipe on tread of block. Phi2: Amplitude (mm) of sipe in cross section as viewed in depth direction at right angle to sipe (20) exposed to tread. Phi3: Amplitude of ridge (22) extending in depth direction of sipe (20) in a plan view of wall surface (20A) of sipe (20). More specifically, the sipe (20) is set so that the sipe amplitude Phi1 on the axial outer side of the tire is larger than the sipe amplitude Phi1' on the equatorial plane CL side of the tire and the sipe amplitude Phi2 on the axial outer side of the tire is larger than the sipe amplitude Phi2' on the equatorial plane CL side.

Description

technical field [0001] The present invention relates to a pneumatic tire, in particular to a pneumatic tire having blocks on the tread, the blocks having sipes. Background technique [0002] Known as: Figure 8A As shown, in a block-type tire 102 having a sipe 100 extending in the tire axial direction (for example, JP-A-2002-321509 and JP-A-9-164815), the sipe generally wears front and rear. The degree of wear varies with the wear of the pattern block 104, such as Figure 8B As shown, a step difference in the circumferential direction (so-called heel and toe wear) occurs, and the degree of wear of the portion opening to the main groove is particularly large. [0003] To suppress heel and toe wear at the opening of the main groove, such as Figure 9A As shown, when the sipe 100 is formed on the block 104, as shown in FIG. Figure 9B As shown, it is well known that the depth of the opening portion of the sipe 100 is made shallower than the depth of the central portion of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/12
CPCB60C2011/1213B60C11/12B60C11/1218
Inventor 坂卷雄二
Owner BRIDGESTONE CORP
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