Helical Gear Speed Reducers
Provide high-efficiency speed reduction through 1, 2, 3, or 4 pieces of gears. Power is transmitted from a high-acceleration pinion to a slower-speed equipment. Helical gears generally operate with their shafts parallel 
to each other. The two most common types are the concentric (input and result shafts are in series) and parallel shaft (insight and output shafts are offset). Single-stage helical gear reducers are typically used for equipment ratios up to about 8:1. Where lower speeds and higher ratios are required, double, triple, and right angle worm gearbox quadruple equipment reduction stages can be used.
Worm Gear Speed Reducers
A single reduction rate reducer can achieve up to a 100:1 decrease ratio in a small package. Known as right position drives, these contain a cylindrical worm with screw threads and a worm. With a single begin worm, the worm gear advances only one tooth for each 360-degree convert of the worm. So, regardless of the worm’s size, the apparatus ratio may be the ‘size of the worm equipment to 1′. Higher reduction ratios can be created through the use of double and triple reduction 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 is usually a speed reducer, the torque result increase; if the drive boosts speed, the torque output will decrease. Gear drive selection factors include: shaft orientation, acceleration ratio, design type, nature of load, gear rating, environment, mounting position, operating temperature range, and lubrication.