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