| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring method of the coefficient of friction capable of precisely measuring the coefficient of friction on a wet road surface while keeping a road surface state constant when the coefficient of friction is measured while changing a slip ratio, and a measuring instrument therefor. SOLUTION: The measuring instrument is equipped with a rotor 1 installed on a road surface R in a freely rotatable manner, a drive motor 4 for driving the rotor 1, the sample support shaft 8 protruded from the rotor 1 to support a rubber test piece S in a freely tumbling state, the drive motor 10 mounted on the rotor 1 to drive the sample support shaft 8 and the torque detector 12 interposed between the drive motor 10 and the sample support shaft 8 and constituted so as to measure the coefficient of friction of the rubber test piece S while tumbling the rubber test piece S on the road surface R along a circular track X. This instrument is also provided with a water supply means constituted by loading the rotor 1 with a water removing means comprising a tire 16 for removing water on a locus, on which the rubber test piece S passes, on the rear side of the track of the rubber test piece S and a water sprinkling means, which includes a water sprinkling port 18 for sprinkling water over the road surface on the front side of the track of the rubber test piece S and including a water tank 32 for supplying water to the water sprinkling means. COPYRIGHT: (C)2006,JPO&NCIPI
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