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Tire

A tire, tire circumferential technology, applied in tire parts, tire tread/tread pattern, transportation and packaging, etc., can solve the problems of loss of traction performance, reduction of edge components, and reduction of the main groove bending angle. The effect of high resistance to uneven wear

Inactive Publication Date: 2012-11-07
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the above-mentioned conventional tires, although the uneven wear resistance can be improved, there is a disadvantage that the traction performance is lost because the bending angle of the main groove is reduced and the edge components are reduced.
In this way, traction performance and uneven wear resistance form a conflicting relationship, and it is difficult to achieve both at a high level
Also, in the existing tires, the improvement of the uneven wear resistance has not been developed, and there is still room for improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0103] The pneumatic tire of Example 2 is figure 1 Pneumatic tires shown. The pneumatic tire of Example 2 is formed in a shape obtained by repeating the wedge-shaped portion in which the interval of the groove wall of the outer main groove becomes narrower toward one side in the tire circumferential direction along the tire circumferential direction. The distance between the vertices of the inwardly protruding portion formed on the wall surface on the inner side in the tire width direction of the outer main groove is longer than the pitch of the apexes of the inwardly protruding portion on the wall surface on the outer side in the tire width direction of the outer main groove. The maximum width W33 in the tire width direction is formed to be equal to the maximum width W43 of the inward protrusion 43 in the tire width direction.

Embodiment 3

[0104] The pneumatic tire of Example 3 is Figure 5 Pneumatic tires shown. That is, the pitch of the apexes of the inwardly projecting portions formed on the wall surface on the inner side in the tire width direction of the outer main groove is compared with the pitch of the apexes of the inwardly projecting portions formed on the wall surface on the outer side in the tire width direction of the outer main groove. Long, the maximum width W33 of the outward protrusion 33 in the tire width direction is formed smaller than the maximum width W43 of the inward protrusion 43 in the tire width direction.

Embodiment 4

[0105] The pneumatic tire of Example 4 is Figure 8 Pneumatic tires shown. That is, the pitch of the apexes of the inwardly projecting portions formed on the wall surface on the inner side in the tire width direction of the outer main groove is compared with the pitch of the apexes of the inwardly projecting portions formed on the wall surface on the outer side in the tire width direction of the outer main groove. Long, the maximum width W33 of the outward protrusion 33 in the tire width direction is formed to be equal to the maximum width W43 of the inward protrusion 43 in the tire width direction.

[0106] (Table 1)

[0107]

[0108] "in" in Table 1 indicates a protrusion formed on the inner wall surface of the outermost main groove in the tire width direction, and "out" indicates a protrusion formed on the outer wall surface of the outermost main groove in the tire width direction.

[0109] (6.2) Evaluation results

[0110] Next, with reference to Table 1, the evaluat...

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PUM

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Abstract

Disclosed is an air-filled tire (1) provided with lugs formed by a central main groove (10), formed in a zigzag pattern around the circumference of the tire, and an outside main groove (20) that contains a void (AS). The lugs comprise a central lug (30), which has an outside wall surface (32), and an outside lug (40), which has an inside wall surface (41). The central lug (30) has a plurality of outwards protrusions (33), formed around the circumference of the tire, that protrude outwards in the width direction of the tire. The outside lug (40) has a plurality of inwards protrusions (43), formed around the circumference of the tire, that protrude inwards in the width direction of the tire. The pitch (P43) of the inwards protrusions (43) is less than that of the outwards protrusions (33).

Description

technical field [0001] The present invention relates to a tire including a land portion formed by a main groove extending in the tire circumferential direction. Background technique [0002] Pneumatic tires mounted on vehicles such as trucks and buses (hereinafter referred to as tires) have been widely used in order to improve traction performance on snowy roads. tread pattern. [0003] In such a serrated main groove, stress tends to concentrate on the protruding end protruding toward the inside of the main groove during driving, and uneven wear tends to occur. In contrast, there is known a tire in which sub grooves are formed in land portions defined by zigzag main grooves, and the sub grooves extend in the tire circumferential direction and are narrower than the main grooves (see Patent Document 1). According to this tire, the progress of uneven wear can be prevented by the sub grooves, so that the reduction in uneven wear resistance can be suppressed as much as possible...

Claims

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Application Information

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IPC IPC(8): B60C11/04B60C11/13
CPCB60C11/0306B60C2011/1338B60C11/04B60C11/13B60C2011/0346
Inventor 高桥淳一越智直也
Owner BRIDGESTONE CORP