Nippo Sangyo Co., Ltd.

Hironari Abe

Toshio Sawa

Atsushi Kasahara

Kosuke Abe

Noboru Ishikawa

Noburu Ishikawa

An object of the present invention is to provide a friction coefficient measurement apparatus which measures an angle of relative torsion caused by a friction between a road surface friction measuring rubber attached strip and a road surface and the friction coefficient measurement apparatus which is able to reduce operator taken for work of replacing the road surface friction measuring rubber attached strip with new one. A friction coefficient measurement apparatus () according to the present invention includes a road surface friction measuring rubber attached strip () and an attaching bolt () which attaches said rubber attached strip ()(to a main body of the friction coefficient measurement apparatus), a diameter of a large-diameter circular part of an attaching bolt insertion opening (A) in said rubber attached strip () is set (slightly) larger than a diameter of a bolt head of the attaching bolt () and a diameter of a small-diameter circular part thereof is set smaller than the diameter of the bolt head of the attaching bolt () and is (slightly) larger than the diameter of the bolt shaft thereof, and a spring washer for anti-loosening the attaching bolt () and a rubber attached strip fall prevention washer () are interposed.

Friction coefficient measurement apparatus

The object of the present invention is to provide a road surface roughness measuring apparatus for measuring the coefficient of dynamic friction and the roughness of the road surface in each direction at a same section where the coefficient of dynamic friction is measured, said apparatus divides the measuring circle on the road surface into a plurality of sections, on which measuring circle the rotary type unit for measuring the coefficient of dynamic friction measures the coefficient of dynamic friction. The road surface roughness measuring apparatus has: a frame ( ) having a plurality of legs ( ) used for placing the apparatus on a road surface (G); a rotary shaft ( ) mounted on the frame ( ) and extending vertically; a rotary encoder ( ) mounted on the top end of the rotary shaft ( ); a rotation plate ( ) mounted on the bottom end of the rotary shaft ( ); a motor ( ) provided with a speed reducing gear and for driving the rotary shaft via gears ( ); and a laser displacement gauge ( ) mounted on the rotation plate ( ). The laser displacement gauge ( ) is disposed in such a way as to measure a road surface roughness along a measuring circle (P) on which the rotary type unit for measuring the coefficient of dynamic friction measures the coefficient of dynamic friction by the rotation of the rotation plate. The measuring circle (P) is divided into a plurality of sections and the road surface roughness for each section (a to h) is calculated based on the signals of the laser displacement gauge ( ) and the rotary encoder ( ).

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Kokubunji, Japan

Hironari Abe