US Patent 11149657 Throttle device

Provided is a throttle device including a total of two throttle units in two cylinders in an engine, each of the throttle units having a throttle shaft, throttle valves, and a motor driving and rotating the throttle shaft, in which a return spring provided in a first throttle unit and a return spring provided in a second throttle unit out of the two throttle units are components of the same type and have mutually different installation forms in the throttle units such that biasing torques at the same degree of opening of the throttle valves differ from each other, thereby enabling performances of responding to a change in rotation speed to be different from each other.