Electronically controlled type throttle valve for internal combustion engines

Claim 1

An electronically controlled type throttle valve for an internal combustion engine, said throttle valve being arranged within a suction passage of the engine and having an opening degree controlled in response to any one of a running condition of the engine to be controlled and an amount of operation of an accelerator pedal, to control an amount of suction air, said throttle valve comprising: a stationary section fixedly mounted within said suction passage in concentric relation thereto and including a tubular member whose at least one end is closed, said stationary section having a peripheral wall whose outer surface cooperates with an inner peripheral surface of said suction passage to define therebetween a gas flow passage, said peripheral wall being formed with at least one pair of openings arranged in symmetrical relation to each other with reference to an axis of said peripheral wall, said openings being symmetrical in configuration to each other; a movable section fitted in said stationary section in concentric relation thereto for sliding movement relative to said stationary section, said movable section having moving walls which correspond respectively to said openings formed in the peripheral wall of said stationary section, said moving walls being arranged in symmetrical relation to each other with reference to a rotary axis of said movable section, said moving walls being symmetrical in configuration to each other; and rotative driving means for imparting rotative driving force to said movable section, wherein a suction passage formed between said openings in said stationary section and said moving walls of said movable section is controlled in area by a position of said movable section relative to said stationary section.