Pneumatic tire and tire mold

A technology for pneumatic tires and forming molds, applied to tire treads/tread patterns, tire parts, tires, etc., can solve problems such as stone trapping, crack damage at the bottom of grooves, and entry, etc., and achieve excellent WET performance, excellent The effect of anti-stone trapping

Inactive Publication Date: 2008-04-09
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of groove has the problem that when driving on uneven gravel roads, stones on the road are sometimes caught in the groove, and when the tire rolls in this state, it is repeatedly pushed to expand the groove. The internal force, or the trapped stones enter the bottom of the ditch, causing damage such as cracks at the bottom of the ditch
However, as mentioned above, when pebbles are caught between the protrusion and the ditch wall, the pebbles are strongly held due to their high rigidity, making it difficult to discharge them out of the ditch.
[0006] In addition, in the following patent document 4, a pneumatic tire is also described in which a ridge is provided at the bottom of the groove, but the height of the ridge is less than or equal to 1mm, and it is possible to arrange several small protrusions side by side at the bottom of the ditch, but it cannot prevent the above-mentioned stone trapping

Method used

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  • Pneumatic tire and tire mold
  • Pneumatic tire and tire mold
  • Pneumatic tire and tire mold

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0051] Fig. 1 is a tire meridian half sectional view showing an example of a pneumatic tire of the present invention. Fig. 2 is a developed view of the tread of the pneumatic tire. Fig. 3 is a sectional oblique view when a part of Fig. 1 is enlarged and viewed obliquely.

[0052] As shown in Figures 1 and 2, in this embodiment, on the outer peripheral side surface of the tread portion 7, that is, on the tread, a circumferential groove 9 as a groove portion is continuously provided along the tire circumferential direction, and the circumferential groove 9 divides The resulting land portion has a rib pattern with the rib 5 as the main tone. On the groove bottom 9 a of the outermost circumferential groove 9 in the tire width direction among the four circumferential grooves 9 , protrusions 10 are provided extending in the extending direction of the circumferential groove 9 , that is, in the tire circumferential direction.

[0053] As shown enlarged in FIG. 3 , the protrusion 10 ...

no. 2 Embodiment approach

[0073] The structure of the second embodiment is the same as that of the first embodiment except for the following structures of the groove portion and the ridge, so the common points will be omitted and the differences will be mainly described. In addition, the same reference numerals are assigned to the same members as those described in the first embodiment, and overlapping descriptions will be omitted.

[0074] As shown in FIG. 6 , the protrusion 20 includes a crown 21 constituting the upper body and a base 22 constituting the lower body. The crown 21 has a substantially circular cross-section, protrudes toward the outer peripheral side of the tire, and is formed by a curved surface that protrudes toward the groove wall 9b side from the front end to the side. The shape of the base 22 is substantially the same as that of the base 12 of the first embodiment, and integrally connects the crown 21 and the groove bottom 9a.

[0075] In the present embodiment, since the protrusi...

no. 3 Embodiment approach

[0078] The structure of the third embodiment is the same as that of the first embodiment except that the grooves and ridges have the following structures, so the common points will be omitted and the differences will be mainly described. In addition, the same reference numerals are assigned to the same members as those described in the first embodiment, and overlapping descriptions will be omitted.

[0079] As shown in FIG. 7 , the protrusion 30 includes a crown 31 constituting the upper body and a base 32 constituting the lower body. The crown 31 has a substantially rectangular cross-section and protrudes toward the tire outer peripheral side with a protrusion height smaller than that of the crown 11 in the first embodiment. The shape of the base 32 is substantially the same as that of the base 12 of the first embodiment, and integrally connects the crown 31 and the groove bottom 9a.

[0080] In this embodiment, the groove wall angle θ2 of the circumferential groove 9 is set...

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Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of suppressing damage such as a channel bottom crack by effectively enhancing a stone non-biting property. ŽSOLUTION: At the channel bottom 9a of a circumferential groove 9 formed on the tread surface, a protrusion 10 is formed extending along the extending direction of the circumferential groove 9. The protrusion 10 comprises a head top 11 protruding toward the outer periphery of the tire and a base 12 having a width narrower than that of the head top 11 and connecting the head top 11 and the channel bottom 9a. When a small stone is bitten, the head top is tilted around the base 12 and the protrusion 10 is totally deflected and deformed, thereby generating a reaction force based on a deformation restoring force. Ž

Description

technical field [0001] The present invention relates to a pneumatic tire having a ridge provided at the groove bottom of a tread groove portion, and a tire molding die for molding the pneumatic tire. Background technique [0002] Usually, the tread of a pneumatic tire is provided with grooves such as circumferential grooves and lateral grooves, and land portions divided by the grooves, so that various tread patterns corresponding to the required tire performance and service conditions are formed. . This kind of groove has the problem that when driving on uneven gravel roads, stones on the road are sometimes caught in the groove, and when the tire rolls in this state, it is repeatedly pushed to expand the groove. The internal force, or the trapped stones enter the bottom of the ditch, causing damage such as cracks at the bottom of the ditch. [0003] As described in the following patent documents 1 to 3, in order to deal with this problem, a technique has been proposed in w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/117B29D30/66
CPCB60C11/047
Inventor 小原将明
Owner TOYO TIRE & RUBBER CO LTD
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