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Pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire tread/tread pattern, vehicle parts, etc., can solve the problem of reduced block rigidity, difficulty in suppressing block lodging, and easy tearing at the bottom of the sipe. and other problems to achieve the effect of inhibiting the disengagement of the mesh

Active Publication Date: 2013-05-22
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, especially when a large driving force or braking force is applied on a dry road surface, the deformation of the pattern block is large, resulting in the misalignment of the wall surfaces of the zigzag-shaped sipe, and the rigidity of the pattern block is reduced.
As a result, the sipe edge portion is in a state of so-called point contact with the road surface, and it is difficult to suppress the lodging of the block, and tearing force is likely to be generated at the bottom of the sipe.

Method used

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  • Pneumatic tire
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no. 1 Embodiment approach

[0049] First, the first embodiment will be described. Such as figure 1 As shown, the pneumatic tire 10 of the present embodiment includes a carcass layer 12 composed of one or more layers, both ends of which are folded back at bead cores 11 .

[0050] On the outside of the crown portion 12C of the carcass layer 12 in the tire radial direction, a belt layer 14 is embedded. The belt layer 14 is formed by overlapping a plurality of (for example, two) belt plies.

[0051] A tread portion 16 provided with grooves is formed on the outer side of the belt layer 14 in the tire radial direction. Such as figure 2As shown, a plurality of circumferential grooves (main grooves) 22 along the tire circumferential direction U are formed on the tire equatorial plane CL of the tread portion 16 and on both sides of the tire equatorial plane CL. Further, a plurality of lateral grooves 24 intersecting the tire circumferential direction U are also formed in the tread portion 16 . In the present...

no. 2 Embodiment approach

[0075] Next, a second embodiment will be described. Such as Figure 9A , Figure 9B As shown, compared with the first embodiment, in the present embodiment, instead of the two ridges 32 and 34 , ridges 52 and 54 bent halfway are formed on one side sipe wall surface 49P. The ridges 52 , 54 form a meeting portion 50 where they meet at the outer end in the tire radial direction.

[0076] The ridge portion 52 is composed of a first ridge portion 56 and a second ridge portion 58. The first ridge portion 56 is obliquely directed inward in the tire radial direction from the converging portion 50 with respect to the tire radial direction (sipe depth direction) R and toward the blade. One end side F in the longitudinal direction of the sipe extends linearly, and the second ridge portion 58 is continuous with the inner end in the tire radial direction of the first ridge portion 56 and is obliquely directed inward in the tire radial direction and toward the length of the sipe. The dir...

no. 3 Embodiment approach

[0082] Next, a third embodiment will be described. Such as Figure 10 As shown, compared with the first embodiment, in this embodiment, instead of the sipe 28, a sipe 68 is formed, and the sipe 68 also has a gap for relaxing the tearing force at the bottom of the sipe. Section 62.

[0083] Accordingly, it is possible to obtain a structure that further prevents cracks from being generated from the bottom of the sipe.

[0084] In addition, in Figure 10 In the drawing, the void portion 62 having a cylindrical cross-section is drawn, but the shape of the void portion 62 may be other shapes such as an elliptical cross-section that can relax the tearing force at the bottom of the sipe.

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Abstract

It is a problem to provide a pneumatic tire where disengagement between sipe wall surfaces is suppressed. In a sipe formed in a block of a tread portion, two ridge portions (32) and (34) are formed in one sipe wall surface (29P), and two valley portions that engage with the ridge portions (32) and (34) are formed in another sipe wall surface. The two ridge portions (32) and (34) form a merged portion (30) where they merge together in the center of a sipe lengthwise direction and at their tire radial direction outside ends, and the two ridge portions (32) and (34) extend linearly from the merged portion (30) toward both sipe-lengthwise-direction end sides (F) and (K) so as to gradually move apart inward in the tire radial direction. Because of this configuration, the contact length of the adjacent sipe wall surfaces in a sipe depth direction (R) becomes longer.

Description

technical field [0001] The present invention relates to a pneumatic tire in which a plurality of blocks having sipes are formed on a tread portion. Background technique [0002] In order to improve the braking performance on ice, conventionally, the number of sipes in the tread portion has been increased and the interval between the sipes has been narrowed. Furthermore, the sipe depth direction is also made into a zigzag shape to further improve ice braking performance (for example, refer to Patent Documents 1 to 4). [0003] Patent Document 1: Japanese Patent Laid-Open No. 2003-118332 [0004] Patent Document 2: Japanese Patent Application Laid-Open No. 10-258615 [0005] Patent Document 3: Japanese Patent Application Laid-Open No. 8-99506 [0006] Patent Document 4: EP0864448B1 [0007] In the case where the sipe is formed in a zigzag shape in the depth direction of the sipe in this way, on an ice-snow road surface, the wall surfaces of the zigzag sipe contact each oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/12
CPCB60C11/11B60C2011/1213B60C11/12B60C11/1218
Inventor 林直宏
Owner BRIDGESTONE CORP