Electric auxiliary engaging and disengaging type power turbine composite supercharger

The invention relates to an electric auxiliary engaging and disengaging type power turbine composite supercharger, and belongs to the field of vehicle motive power machines. According to a motor external scheme, a motor dynamo acts as an auxiliary motor to be arranged outside the supercharger, motor energy is transmitted to a rotor shaft of the supercharger through a gear box, and an engaging anddisengaging device can be controlled to engage the gear box with the rotor shaft and disengage the gear box from the rotor shaft according to different working conditions; and under a high-speed working condition of the motor dynamo, surplus energy of the rotor shaft can drive the motor dynamo to generate electricity through the gear box. With such motor external scheme, the influence on an electronic component of the motor dynamo by high temperature is avoided effectively, and efficient distribution and utilization of energy of the supercharger is realized; and the turbine end of the supercharger is connected with a