Throttle actuator

Abstract

A throttle actuator comprising: a body which forms an intake passage; a throttle valve shaft; a throttle valve which is connected to the throttle valve shaft and which adjusts the opening of the intake passage; and a motor which applies torque to the throttle valve shaft. The throttle valve is provided with: a valve shaft lever; an accelerator lever which is operated by means of the accelerator pedal; a floating lever which is positioned between the valve shaft lever and the accelerator lever and which transmits torque to the valve shaft lever in such a direction that the throttle valve opens; a valve returning spring which applies torque to the throttle valve shaft in such a direction that the throttle valve closes; a coupler spring which pulls the accelerator lever and the floating lever toward each other; and an accelerator lever returning spring which applies torque to the accelerator lever in such a direction that the throttle valve closes. A difference between the amount of operation caused by the action of the accelerator pedal and the amount of operation caused by the motor is offset by the relationships between the set positions of floating lever and the coupler spring and between the set positions of the floating lever and the valve shaft lever.