Helical Gear Speed Reducers
Provide high-efficiency speed decrease through 1, 2, 3, or 4 pieces of gears. Power can be transmitted from a high-acceleration pinion to a slower-speed equipment. Helical gears generally operate with their shafts parallel to one another. The two most common types will be the concentric (input and output shafts are in line) and parallel shaft (input and result shafts are offset). Single-stage helical right angle worm gearbox equipment reducers are typically used for gear ratios up to about 8:1. Where reduce speeds and higher 
ratios are necessary, double, triple, and quadruple gear reduction stages can be used.
Worm Gear Speed Reducers
A single reduction speed reducer can achieve up to a 100:1 reduction ratio in a little package. Referred to 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, regardless of the worm’s size, the gear ratio is the ‘size of the worm gear to 1′. Higher reduction ratios can be created through the use of double and triple reduction ratios.
Basic Types of Gearboxes
The objective of a gearbox is to improve or reduce speed. Because of this, torque output will be the inverse of the function. If the enclosed drive is certainly a speed reducer, the torque output will increase; if the drive raises speed, the torque result will reduce. Gear drive selection factors include: shaft orientation, velocity ratio, design type, nature of load, gear ranking, environment, mounting position, operating temperature range, and lubrication.