China Worm Gear Plastic Stainless Steel Aluminum Motor Wheel Diameter Bevel Gear DC Shafts Pin Nylon Bore Tooth Brass Steels Shaft Miniature for Speed

Worm Gear Plastic Stainless Steel Aluminum Motor Wheel Diameter Bevel Gear DC Shafts Pin Nylon Bore Tooth Brass Steels Shaft Miniature for Speed Reductions Gear

Worm gears are usually used when large speed reductions are needed. The reduction ratio is determined by the number of starts of the worm and number of teeth on the worm gear. But worm gears have sliding contact which is quiet but tends to produce heat and have relatively low transmission efficiency.
There are some reasons why you might select a worm gear more than a standard gear.
The first one may be the high reduction ratio. A worm equipment can have an enormous reduction ratio with small effort - all one should do is certainly add circumference to the steering wheel. Thus you can utilize it to either significantly increase torque or help reduce speed. It'll typically consider multiple reductions of a typical gearset to attain the same reduction degree of a single worm equipment - which means users of worm gears have got fewer shifting parts and fewer areas for failure.
A second reason to employ a worm gear may be the inability to reverse the direction of power. Because of the friction between the worm and the wheel, it is virtually impossible for a wheel with force applied to it to start the worm moving.