ELECTRONICALLY CONTROLLED TYPE THROTLE VALVE FOR INTERNAL COMBUSTION ENGINES

摘要

An electronically controlled type throttle valve for an internal combustion engine is arranged within a suction passage of the engine. An opening degree of the throttle valve is controlled in response to a running condition of the engine to be controlled or an amount of depression of an accelerator pedal, thereby controlling an amount of suction air. The throttle valve comprises a stationary section and a movable section. The stationary section is fixedly arranged within a suction passage in concentric relation thereto, and is composed of a tubular member whose one end is closed. A gas flow passage is defined between a peripheral wall of the stationary section and the suction passage. The peripheral wall is formed with at least one pair of openings. The movable section is fitted in the stationary section in concentric relation thereto for sliding movement relative to the stationary section. The movable section has a peripheral wall provided with openings corresponding respectively to the openings formed in the peripheral wall of the stationary section. A motor is arranged to impart rotative driving force to the movable section. The suction passage is controlled in area by a rotational position of the movable section relative to the stationary section, thereby controlling the amount of suction air.