Throttle valve opening/closing apparatus for internal combustion engine of vehicle, has return spring that actuates throttle valve to move to default position where aperture area of intake passage is minimum when motor is not working

摘要

A throttle valve (18) actuated by a motor, is held in intake passage (19) of engine. A return spring actuates the throttle valve to move to default position where aperture area of the passage is minimum when motor is not working. The aperture area of the passage is enlarged by moving the valve from default position.