Variable section exhaust driven supercharger actuator

The invention relates to a variablesection exhaust driven supercharger actuator using a worm and gear self-locking principle to eliminate exhaust gas flow disturbance and machine vibration influences on a nozzle ring, and thus affecting a motor; the variablesection exhaust driven supercharger actuator comprises the motor, a first stage transmission mechanism, a worm and gear transmission mechanism with self-locking function, a connecting rod mechanism and the nozzle ring; an output shaft of the motor is fixed with a drive gear of the first stage transmission mechanism; a driven gear of the first stage transmission mechanism is fixed with a worm of the worm and gear transmission mechanism; a worm gear in the worm and gear mechanism is connected with a short rod in the connecting rod mechanism through a rotary shaft; a long rod in the connecting rod mechanism is connected with the nozzle ring. The motor can transmit one-way torque to the nozzle ring, thus omitting a return spring, simplifying structure, and red