MEASURING THE ESCALATOR TRANSMISSION EFFICIENCY

摘要

At the Institute for Machine Elements and Machine Design three different escalator (moving staircase) gearboxes were tested to compare their coefficient of efficiency. The tested gears are two worm gears and a bevel-spur gear. The two worm gears differ in its tooth shape (hollow flank ― involute flank). For this purpose a test bed consisting of gearbox, electric motor and regulated pendulum generator was built up. To calculate the coefficient of efficiency it is necessary to measure the input- and output-torque at both gear shafts. First is done by measuring the effective power (2-Wattmeter Method) of the electric motor. The second value, the output-torque, could be controlled with aid of the brake generator and is exactly known. The coefficient of efficiency of each gear is measured for both directions at idle, 25%, 40%, 50%, 75% and full load.