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—The purpose of this study is to propose a technique to reduce the torque applied onto driven shafts of monorail for urban constructions and forest industries. To reduce the maximum torque contribution ratios of driven shafts, a modified transmitting system for the monorail was proposed. The system is concurrently driven by two v-belts in which the phase difference of rotational angle was allowed. To evaluate the difference of torques produced on the shaft, two types of gearboxes of the vehicle were prepared to experimentally drive on the rack rail with short range (250mm) in test field. Two rack rails in which observed wear depth of the rack tooth was w=0 and 3mm were prepared. The variations of torques of driven shafts were measured with respect to the rotational angle of the shaft when the driven pinion gears were engaged with original and worn rack rail in which the wear depth of tooth was w=3mm, respectively. The torque contribution ratio of rear driven shaft was reduced down to about 63% by applying modified power train, while that was highly 89% through the conventional power train, even when the test systems were driven on worn rack rail. The increase of the torque contribution ratio of driven shafts was prevented in comparison with those by applying the conventional power train. This study found that the modified power train where two pinion gears were concurrently driven by two v-belts should be applied to reduce the maximum torque contribution ratio of driven shafts.

Reduction of Maximum Torque of Driving Shafts Concurrently Driven by Rubber V-belt for Monorail Traveling on Worn Rack Rail for Construction Uses