|発明の名称||METHOD AND DEVICE FOR MEASURING ROAD SURFACE FRICTION|
PROBLEM TO BE SOLVED: To provide a road surface friction measuring device capable of being easily mounted on a general automobile and measuring coefficients of friction of various road surfaces such as a road, a runway or the like with high accuracy.
SOLUTION: This device has a spindle 5 removably connected to a wheel of a driving wheel 3 of an automobile, an oscillatable supporting arm 6 connected to the spindle, and a measuring ring rotatably supported by the supporting arm. The supporting arm 6 is provided with a vertical drag generating mechanism generating the vertical drag to be added to the self-weight of the measuring ring 8, a first detecting means for detecting the vertical drag received by the measuring ring from a road surface, a rotation transmitting mechanism for transmitting the rotation of the spindle to the measuring ring for producing the difference in peripheral speeds between the driving wheel and the measuring ring, and a second detecting means for detecting the rotational resistance received by the driving wheel from the road surface, and a coefficient of friction of the road surface is calculated by an operating means on the basis of detected values of these detecting means, and the self-weight of the measurer including the arm.
- 国立研究開発法人宇宙航空研究開発機構（JAXA） 産業連携センター
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