Helical Gear Speed Reducers
Provide high-efficiency speed reduction through 1, 2, 3, or 4 units of gears. Vitality is usually transmitted from a large-speed pinion to a slower-speed gear. Helical gears generally operate with their shafts parallel to one another. The two most common types are the concentric (input and result shafts are in range) and parallel 
shaft (input and output shafts are offset). Single-stage helical equipment reducers are typically used for gear ratios up to about 8:1. Where reduced speeds and larger ratios are required, dual, triple, and quadruple gear reduction stages can be used.
Worm Gear Speed Reducers
A single reduction acceleration reducer can achieve up to a 100:1 reduction ratio in a small package. Referred to 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 switch of the worm. Hence, regardless of the worm’s size, the apparatus ratio is the ‘size of the worm equipment to 1′. Higher reduction ratios can be created by using double and triple reduction 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 drive is a acceleration reducer, the torque output will increase; if the travel increases speed, the torque output will decrease. Gear drive selection elements include: shaft orientation, speed ratio, design type, character of load, gear ranking, environment, mounting position, operating temperature range, and lubrication.
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