Throttle apparatus for an internal combustion engine

摘要

A returning spring of the electronic control throttle and a default spring for securing an initial opening degree (default opening degree) of the throttle valve have diameters different from each other, and both of the springs are held around a shaft of the throttle valve shaft and arranged between a gear attached to the throttle valve shaft and a wall portion of the throttle body. A shaft supporting gap of the throttle valve shaft is filled with an air leak preventing material, and a minimum opening degree of the throttle valve is set to a value larger than an amount of overshoot of the throttle valve occurring when the opening degree of the throttle valve is changed from a maximum opening degree to the minimum opening degree.