Intake air control device for internal combustion engine of fuel injection type

Claim 1

An air intake control device for an internal combustion engine of fuel injection type of a motor vehicle having an air intake passage communicating with individual combustion chambers of the engine and a throttle valve disposed in said air intake passage, said air intake control device comprising a control means adapted to be provided in said air intake passage for effecting a gradual increase in the amount of air flow passing therethrough after a predetermined time lapse from the moment an acceleration control member is actuated to open said throttle valve for acceleration of the motor vehicle, said control means including a flap member adapted to be tilted in said air intake passage for allowing a gradually increasing amount of air to flow through the effective area defined by the circumferential edge thereof and the inner wall of said air intake passage, a shaft member pivotally mounted on the wall slightly off the center of said air intake passage, an arm member secured to one end of said shaft member and extending substantially perpendicularly to said shaft member, a weight member secured to one end of said arm member for controlling the period of said time lapse by the inertial mass thereof together with said arm member, and an opening control means operatively connected to said flap member and said throttle valve for tilting said flap member to its fully open position in dependence on the fully opening of said throttle valve, said opening control means including a first bell crank secured to the shaft of said throttle valve for rotating therewith and having a first pin at one end thereof, a second bell crank secured to said shaft member for rotating therewith and having a second pin at one end thereof, and a rod member mounted on said first pin for rotating thereabout having an elongated slot longitudinally formed near one end thereof for movably receiving said second pin.