Helical Gear Speed Reducers
Provide high-efficiency speed reduction through 1, 2, 3, or 4 models of gears. Power is transmitted from a large-rate pinion to a slower-speed equipment. Helical gears generally operate with their shafts parallel to each other. The two most common types will be the concentric (input and output shafts are in range) and parallel shaft (input and output shafts happen to be offset). Single-stage helical equipment reducers are usually used for equipment ratios up to about 8:1. Where cheaper speeds and more significant ratios are required, dual, triple, and quadruple equipment reduction stages can be used.
Worm Gear Speed Reducers
A single reduction velocity reducer can achieve up to a 100:1 decrease ratio in a small package. 
Referred to as right position drives, these consist of a cylindrical worm with screw threads and a worm. With an individual start worm, the worm equipment advances only one tooth for each 360-degree change of the worm. Therefore, regardless of the worm’s size, the gear ratio is the ‘size of the worm equipment to 1′. Higher reduction ratios could be created through the use of double and triple decrease ratios.
Basic Types of Gearboxes
The purpose 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 a speed reducer, the torque result will increase; if the get raises speed, the torque output will decrease. Gear drive selection elements include: shaft orientation, rate ratio, design type, nature of load, gear rating, environment, mounting position, working temperature selection, and lubrication.
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