Helical speed reducer, gearbox, gear reducer, gear unit Reduction ... Output torque: 50~18000N.m MD series helical gearbox, speed reducer, gear reducer, gear unitReduction ratio: 1:3. ... with other merits such as easying to attain various transmission ratio, high efficiency, low vibration and high permissible ... but also be advantage of localization of related transmission equipment. Helical speed reducer