Speed reducers are mechanical gadgets that help drive systems maintain optimal swiftness and torque for the application. Also known as gearboxes and equipment drives, they lower the quickness of rotation of the insight shaft by a particular ratio and raise the power transmitted to the output shaft by the same ratio. Ratio multipliers boost the speed decrease and torque given by a quickness reducer by a particular ratio and are ideal for parallel setups. Mounting bases, torque hands, and flange couplings are components used with swiftness reducers. They are often used in applications where in fact the speed reducer will never be directly attached to the drive mechanism.
Many gearbox designs enable the engine to be directly mounted to the reducer. These designs incorporate either extremely specific flanges to permit the engine to be directly plugged into the reducer or various other adapters with integral couplings. This eliminates the need for separate mounting of the engine, but is generally only practical with smaller sized motors.
Integrating Speed Reducers
After selection, another issue is how the gearbox will be integrated into the machine. Always check how the gearbox will become mounted and how it will be connected to the driver and driven load because it may differ from machine to machine.
torque
speed
horsepower
reducer efficiency
service factor
mounting position
connection variable
life required
In some applications the quantity of backlash, transmission error, torsional rigidity, and instant of inertia are also important. The quantity of torque needed could very well be the most important criteria, as this means the quantity of work the rate reducer must perform.
speed reducer gearbox is a fad 
that is slowly increasing.