System for detoxicating exhaust gases

Claim 1

In a system for detoxicating exhaust gases in an internal combustion engine, having air intake pipe means and conduit means having a central longitudinal axis for recycling a part of the exhaust gases of said engine into said air intake pipe means, the improvement comprising, in combination, valve means including a movable valve member for controlling the flow of said part of the exhaust gases being thus recycled, throttle means comprising a flap, a housing for said valve means, said housing being mounted directly to said air intake pipe means and having an opening for receiving said conduit means therein, and a shaft on which both the flap and the movable valve member are mounted for common rotation therewith, said movable valve member being thus controlled in dependence on the adjustment of the throttle flap, said flap being mounted within said air intake pipe means and said movable valve member being mounted within said housing in a plane which is perpendicular to the central longitudinal axis of the conduit means, wherein said intake pipe means includes an opening through which the recycled exhaust gases flow into said intake pipe means, wherein said movable valve member controls the flow of said part of the exhaust gases being thus recycled by controlling the extent of both said openings utilizing a marginal portion thereof, and wherein said movable valve member comprises a disc having a central axis coincident with the axis of rotation defined by said shaft and being adapted for rotation about said axis in a plane at an angle with said conduit means, said marginal portion being profiled as a cam and said conduit means comprises an interrupted wall zone within which a transverse wall zone is defined through which said marginal disc portion passes while in engagement with the transverse wall zone, whereby the cross-sectional area of said conduit means is varied in dependence on said cam and upon rotational adjustment of the position of said disc.