Helical Gear Speed Reducers
Provide high-efficiency speed reduction through 1, 2, 3, or 4 pieces of gears. Power is transmitted from a high-velocity 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 right angle worm gearbox output shafts are in range) and parallel shaft (insight and result shafts are offset). Single-stage helical gear reducers are usually used for equipment ratios up to about 8:1. Where cheaper speeds and higher ratios are necessary, double, triple, and quadruple equipment reduction stages can be used.
Worm Gear Speed Reducers
A single reduction swiftness reducer can achieve up to a 100:1 reduction ratio in a little package. Known as right angle drives, these consist of a cylindrical worm with screw threads and a worm. With an individual start worm, the worm equipment advances only 1 tooth for each 360-degree change of the worm. So, whatever the worm’s size, the apparatus ratio is 
the ‘size of the worm equipment to 1′. Higher decrease ratios can be created by using 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 rate reducer, the torque output increase; if the drive increases speed, the torque output will reduce. Gear drive selection elements include: shaft orientation, quickness ratio, design type, nature of load, gear rating, environment, mounting position, operating temperature range, and lubrication.