Helical Gear Speed Reducers
Provide high-efficiency speed reduction through 1, 2, 3, or 4 pieces of gears. Power can be transmitted from a high-quickness pinion to a slower-speed gear. Helical gears usually operate with their shafts parallel to one another. Both most common types are the concentric (insight and result shafts are in line) and parallel shaft (insight and output shafts are offset). Single-stage helical equipment reducers are usually used for equipment ratios up to about 8:1. Where decrease speeds and higher ratios are required, double, triple, and quadruple gear reduction stages can be used.
Worm Gear Speed Reducers
A single reduction swiftness 
reducer can achieve up to 100:1 decrease ratio in a little package. Known as right position drives, these contain a cylindrical worm with screw threads and a worm. With a single begin worm, the worm equipment advances only 1 tooth for each 360-degree switch of the worm. So, whatever the worm’s size, the gear ratio may be the ‘size of the worm gear to 1′. Higher reduction ratios could be created through the use of double and triple decrease ratios.
Basic Types of Gearboxes
The objective of a gearbox is to improve or reduce speed. As a result, torque output will be the inverse of the function. If the enclosed drive can be a velocity reducer, the torque output will increase; if the drive right angle worm gearbox increases speed, the torque result will decrease. Gear drive selection factors include: shaft orientation, speed ratio, design type, nature of load, gear ranking, environment, mounting position, working temperature range, and lubrication.