Connect the engine output shaft to the rotor shaft (and the tail drive shaft) to transfer the engine power to the rotor (and the tail rotor) reduction device.
The main reducer is the main component in the automobile transmission system to reduce the speed and increase the torque. For cars with vertical engines, the main reducer also uses bevel gears to change the direction of power.
After the transmission speed is reduced through the main reducer, a relatively high output torque can be obtained, so as to obtain a larger driving force.
![81.35100.6423 Rear axle middle section assembly HANDE HDZ300 Rear axle drive SHACMAN F2000 F3000 X3000 M3000 H3000 L3000](http://m.flamingdream.com/skin/default/image/lazy.gif)