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-rate pinion to a slower-speed gear. Helical gears generally operate with their shafts parallel to one another. Both most common types will be the concentric (insight and result shafts are in collection) and parallel shaft (insight and output shafts are offset). Single-stage helical equipment reducers are typically used for equipment ratios up to about 8:1. Where decrease speeds and higher ratios are necessary, dual, triple, and quadruple gear reduction stages may be used.
Worm Gear Speed Reducers
A single reduction swiftness reducer can achieve up to 100:1 decrease ratio in a small package. Known as right position drives, these consist of a cylindrical worm with screw threads and a worm. With an individual begin worm, the worm gear 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 gear to 1′. Higher decrease ratios can be created through the use of double and triple decrease ratios.
Basic Types of Gearboxes
The objective of a gearbox is to increase or reduce speed. Consequently, torque output will be the inverse of the function. If the enclosed drive is usually a rate reducer, the torque output will increase; if the drive increases 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 range, and lubrication.
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