How does the gear unit work?

The Helical Bevel Gear Drives is generally used for low-speed and high-torque transmission equipment, the motor. Internal combustion engine or other high-speed operation of the power through the reducer on the input shaft teeth less gear meshing the output gear on the speed variator motor to achieve the purpose of deceleration, Reducer will have several pairs of the same principle gear to achieve the desired deceleration effect, the size of the gear ratio of teeth, is the transmission ratio.