Helical Gear Speed Reducers
Provide high-efficiency speed reduction through 1, 2, 3, or 4 pieces of gears. Power is transmitted from a high-velocity pinion to a slower-speed gear. Helical gears usually operate with their shafts right angle worm gearbox parallel to one another. The two most common types will be the concentric (input and output shafts are in line) and parallel shaft (insight and output shafts are offset). Single-stage helical gear reducers are typically used for equipment ratios up to about 8:1. Where reduce speeds and higher ratios are required, double, triple, and quadruple equipment reduction stages can be used.
Worm Gear Speed Reducers
A single reduction rate reducer can achieve up to 100:1 decrease ratio in a small package. Referred to as right angle drives, these consist of a cylindrical worm with screw threads and a worm. With an individual start worm, the worm gear advances only 1 tooth for every 360-degree switch of the worm. So, 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. Consequently, torque output will be the inverse of the function. If the enclosed drive can be a rate reducer, the torque output will increase; if the drive boosts speed, the torque output will decrease. Gear drive selection factors include: shaft orientation, acceleration ratio, design type, nature of load, gear rating, environment, mounting position, operating temperature range, and lubrication.