Helical Gear Speed Reducers
Provide high-efficiency speed decrease through 1, 2, 3, or 4 pieces of gears. Power is usually transmitted from a high-velocity pinion to a slower-speed equipment. Helical gears usually operate with their shafts parallel to each other. Both most common types are the concentric (insight and output shafts are in range) and parallel shaft (input and result shafts are offset). Single-stage helical equipment reducers are usually used for gear ratios up to about 8:1. Where decrease speeds and higher ratios are required, dual, triple, and quadruple gear right angle worm gearbox reduction stages can be used.
Worm Gear Speed Reducers
A single reduction quickness reducer can achieve up to 100:1 reduction ratio in a small package. Known as right angle drives, these consist of a cylindrical worm with screw threads and a worm. With a single start worm, the worm equipment advances only 1 tooth for each 360-degree change of the worm. So, regardless of 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 reduction ratios.
Basic Types of Gearboxes
The objective of a gearbox is to increase or reduce speed. As a result, torque output 
would be the inverse of the function. If the enclosed drive is a swiftness reducer, the torque output increase; if the drive increases speed, the torque result will reduce. Gear drive selection elements include: shaft orientation, speed ratio, design type, character of load, gear rating, environment, mounting position, working temperature range, and lubrication.