What is a speed reducer?

What precisely is a speed reducer (speed gearboxes)? It is simply a kind of transmission which is situated between engine motor and working equipment. It assumes an essential part in bringing down the motor speed and increase the torque. Sometime, to meet some special work situation, it may be utilized to raise the speed.
 
When we choose the right model of speed reducer, obviously they need to know the requirement of working machine, such as the working condition, the force machine and monetary productivity. There are so many sorts of worm speed reducers accessible in the market that it is hard for you to pick the suitable one. Meanwhile, it is better to analyze a few sorts of reducers, including their sizes, transmission proficiency, stacking limit, quality and cost.