Helical Gear Speed Reducers
Provide high-efficiency speed reduction through 1, 2, 3, or 4 pieces of gears. Electric power is usually transmitted from a excessive-acceleration pinion to a slower-speed equipment. Helical gears generally operate with their shafts parallel to one another. The two most common types are the concentric (insight and output shafts are in range) and parallel shaft (insight and output shafts will be offset). Single-stage helical equipment reducers are usually used for gear ratios up to about 8:1. Where reduced speeds and more significant ratios are required, double, triple, and quadruple gear reduction stages may be used.
Worm Gear Speed Reducers
A single reduction rate reducer can achieve up to 100:1 reduction ratio in a small package. Known as right angle drives, these contain a cylindrical worm with screw threads and a worm. With an individual start worm, the worm gear advances only one tooth for every 360-degree switch of the worm. Consequently, regardless of the worm’s size, the gear ratio may be the ‘size of the worm gear to 1′. Higher decrease ratios can be created through the use of double and triple decrease ratios.
Basic Types of Gearboxes
The purpose of a gearbox is to increase or reduce speed. Because of this, torque output will be the inverse of the function. If the enclosed get is a rate reducer, the torque result will increase; if the get improves speed, the torque result will decrease. Gear drive selection elements include: shaft orientation, velocity ratio, design type, nature of load, gear rating, environment, 
mounting position, operating temperature selection, and lubrication.
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