This article discusses work carried out to ascertain the power transfer from motorcycle tyres to real road surfaces. The apparatus used was the motorcycle tyre measuring trailer developed at Darmstadt University. The apparatus can measure the wheel loads, wheel slip, slip angle, roll angle and driving speed. Lateral and longitudinal forces can be measured concurrently. The measuring wheel attached to the trailer can follow vertically the uneveness of the road without influencing slip, slip angle and roll angle of the wheel and with little change in the wheel load. All load conditions of the real driving range can be reconstructed over a wide operational range. All test parameters that are not prefixed are recorded and transferred to the microcomputer installed in the towing car. Data analysis and the evaluation of the results, can be done either on a microcomputer or on a main frame computer, and a special program is available to calculate average values and standard deviations of all the relevant data. The result of an experiment with a rear wheel tyre sized 130/90 V 17, with constant tyre pressure, (2.5 bar), wheel load (900 N) and road surface (both the dry and wet asphalt concrete), are presented.
Abstract