Pneumatic tire for motorcycle
A technology for motorized two-wheeled vehicles and pneumatic tires, which is applied to motor vehicles, motorcycle tires, tire parts, etc., can solve the problems of enhancing the wear resistance of the conductive layer, eliminate the possibility of the conductive layer falling off, eliminate the The effect of uniform wear
Active Publication Date: 2012-09-12
BRIDGESTONE CORP
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AI Technical Summary
Problems solved by technology
[0010] The present invention aims to solve the problems of the conventional technology, and an object of the present invention is to provide a pneumatic tire for a motorcycle capable of: Make the conductive layer made of conductive rubber in reliable contact with the road surface during the process and when the two-wheeled motor vehicle is in an inclined parking posture; suppress the input to the conductive layer when the tire load rotates during the straight driving of the two-wheeled motor vehicle; enhance Abrasion resistance of the conductive layer; effectively excludes the possibility of peeling off
Method used
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Embodiment
[0037] As rear tires having a size of 180 / 55 ZR17, conventional tires having the characteristics shown in Table 1, comparative tires and example tires were prepared. The prepared tires were installed on the test vehicle together with the front tires with a size of 120 / 70 ZR17, and the road surface discharge characteristics and wet performance of static electricity during the running of the test vehicle were evaluated. The obtained results are shown in Table 1. It should be noted that larger index values for wetland performance indicate better results.
[0038] [Table 1]
[0039]
[0040] As can be seen from Table 1, the example tire has the following configuration: the offset of the thickness center of the conductive layer relative to the equatorial plane of the tire is set to 5.6%, so that the resistivity of the tread portion of the central region and the shoulder region is set to 1×10 8 Ω or more, and the rubber parts of the central area and the shoulder area are mad...
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Disclosed is a pneumatic tire for a motorcycle having a conductive layer that is composed of a conductive rubber; that can be brought into reliable contact with the road surface not only during straight traveling and the like, the motorcycle traveling straight with the highest frequency, but also when the motorcycle is in a tilted stop position; and of which wear resistance is improved and, in addition, fear for loss of which is effectively removed by suppressing input to the conductive layer during rolling of tire loads such as straight traveling of the motorcycle. Specifically disclosed is a pneumatic tire for a motorcycle which comprises a tread portion (1) including a tread rubber (6) that forms a single-layer structure with a tread contact surface (7); a pair of sidewall portions (2) continuously extending inward in radial directions from respective side portions of the tread portion (1); and bead portions (3) continuing inward in radial directions from the sidewall portions. The pneumatic tire further comprises a conductive layer (8) that is composed of a rubber having a specific resistance of 1 106 O or less and that is formed in the entire thickness of the tread rubber (6) in a central area of the tread contact surface (7) in the width direction at a side of the equatorial plane (C) of the tire at a position remote from the equatorial plane (C), and the specific resistance of the tread rubber portion other than the conductive layer (8) is set to 1 108 O or more.
Description
technical field [0001] The present invention relates to a pneumatic tire for a two-wheeled motor vehicle, and proposes a tire that can obtain extremely excellent driving performance regardless of whether the road surface is dry or wet, and can fully reduce the static electricity of the tire belt during driving and during parking. Technology that releases from tires to prevent sparks for safety in refueling or other usage activities. Background technique [0002] In recent years, in order to improve wet performance, the filling rate of silica in the tread rubber of tires for motorcycles tends to be increased. Since the greater the filling rate of silica, the lower the conductivity of the tire will be, so other means are needed to discharge the static electricity generated during the rotation of the tire under load. [0003] Patent Document 1 and Patent Document 2 describe that the ground contact surface of the tread portion is divided into a plurality of regions, and one or ...
Claims
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IPC IPC(8): B60C19/08B60C11/00
CPCB60C11/00B60C11/005B60C11/0058B60C19/08B60C2200/10
Inventor 青木信治佐藤周作
Owner BRIDGESTONE CORP