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Pneumatic tire

A technology for pneumatic tires and tires, applied in tire parts, tire treads/tread patterns, transportation and packaging, etc., can solve the problem of reduced central rib rigidity, inability to simultaneously improve handling stability and wet skid resistance, and handling stability. It can achieve high ground pressure, provide anti-wet-slip drainage, and improve wet-slip performance.

Inactive Publication Date: 2009-07-08
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when multiple transverse grooves are used on the center rib to improve moisture and drainage performance, the rigidity of the protrusion of the center rib will decrease, resulting in lower steering stability.
[0007] That is, in the prior art, the handling stability and the wet skid resistance cannot be improved at the same time.

Method used

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Experimental program
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no. 1 Embodiment approach 〕

[0131] Next, a first embodiment of the present invention will be described in detail with reference to the drawings.

[0132] Such as figure 1 As shown, on the tread 12 of the pneumatic tire 10 of the present embodiment, on both sides of the equatorial plane CL of the tire, there are respectively formed along the tire circumferential direction (the direction of the arrow A (the direction of the tire rotation in this embodiment) and the direction of the arrow B respectively. The central circumferential main groove 14 extending in the tire axial direction is formed on the outer side of the central circumferential main groove 14 in the tire axial direction, and the side circumferential main groove 16 extending along the tire circumferential direction is formed.

[0133] In addition, since the structure of the pneumatic tire 10 of this embodiment is the same as that of a general radial tire, description of its internal structure is omitted.

[0134] (central bulge column)

[013...

no. 2 Embodiment

[0231] Below, refer to Figure 7 and Figure 8 A second embodiment of the present invention will be described. The same structures as those in the first embodiment are assigned the same symbols, and descriptions thereof are omitted.

[0232] Such as Figure 7 As shown, the pneumatic tire 60 of the present embodiment differs in the size of the central protrusion row chamfer 24 from that of the first embodiment.

[0233] The central protrusion row chamfered portion 24 of the present embodiment is formed only on a portion of the circumferentially adjacent non-chamfered portion 26 protruding from the end portion on the central circumferential main groove 14 side.

[0234] Such as Figure 8 As shown, in the center protrusion row 18, the groove wall 24S on the tire axial side of the portion protruding toward the central circumferential main groove 14 side at the tire axial position, and the groove wall on the tire axial side of the non-chamfered portion 26 26S is connected to t...

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Abstract

The present invention provides a pneumatic tire capable of improving moisture resistance without deteriorating handling stability. Since a pair of central circumferential main grooves (14) and side circumferential main grooves (16) are arranged on the tread (12), high wet skid resistance can be obtained. Since the two sides of the central protrusion row (18) are provided with several central protrusion row transverse grooves (20) at approximately constant intervals, the wet skid resistance is further improved. In addition, since the central protrusion row chamfer (24) is formed at the obtuse angle portion of the central protrusion row (18), the central protrusion row chamfer (24) divides the distance between the tread and the road surface. Water drains to the adjacent central circumferential main groove (14) which provides anti-slip drainage. Because the central protrusion row chamfer (24) drains water, so it is not necessary to use the central protrusion row transverse groove (20), which can ensure the rigidity of the protrusions of the central protrusion row (18), and also ensure the handling Stablize.

Description

technical field [0001] The present invention relates to pneumatic tires, and more particularly, to pneumatic tires capable of improving wet skid resistance without deteriorating handling stability. Background technique [0002] On the tread of a pneumatic tire, circumferential grooves are formed in order to obtain wet skid resistance. [0003] It is well known that a center rib tire having a center rib extending in the tire circumferential direction on the equatorial plane of the tire has better steering stability than a tire having a center groove tire having circumferential grooves on the tire equatorial plane. [0004] When the width of the central rib (central protrusion row) is widened, the steering stability can be improved, but the wet skid resistance is reduced. [0005] For this reason, in cars, light trucks, etc., in order to prevent the degradation of moisture resistance and drainage, tires with transverse grooves on the central rib are generally used (for exampl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C11/11B60C11/12B60C11/03B60C11/04B60C11/13
CPCB60C11/11B60C11/1384B60C11/1392B60C11/13B60C11/0309B60C11/1218B60C11/12B60C11/0306Y10S152/03Y10S152/902Y10S152/903
Inventor 宫坂淳
Owner BRIDGESTONE CORP
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