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DEVICE FOR THE INJECTION OF GASES INTO THE FEED SYSTEM OF AN INTERNAL COMBUSTION ENGINE

  • US 3,680,534 A
  • Filed: 03/30/1970
  • Issued: 08/01/1972
  • Est. Priority Date: 03/30/1970
  • Status: Expired due to Term
First Claim
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1. In an internal combustion engine, an elongated conduit for directing a fuel-air mixture from a carburetter to an intake of the engine, an elongated tube of Venturi-shaped configuration coaxially situated within said conduit and having an upstream inlet end and a downstream outlet end, said tube having a substantially uniform wall thickness and being fixed only at its upstream inlet end to the inner surface of said conduit along the entire peripheral edge of said tube at said upstream inlet end thereof so that the mixture is directed by said conduit through said tube, the latter defining at its downstream outlet end a relatively narrow gap with the interior surface of said conduit and said tube also defining with the interior surface of said conduit an elongated annular space which has a maximum width at an intermediate zone of said space surrounding a throat region of said tube with said space gradually diminishing in width from said intermediate zone in the upstream and downstream directions respectively toward said inlet end of said tube and said gap, said space being closed at said inlet end of said tube so that it communicates with the interior of said conduit only through said gap, and supply means communicating trough said conduit With said space and having an outlet occupying a given distance axially of said conduit opening into the intermediate zone of said space for supplying exhaust gases thereto, said space extending upstream of said outlet through a substantial distance which is substantially greater than said given distance as well as dOwnstream of said outlet also through a substantial distance which is substantially greater than said given distance, so that exhaust gases supplied to said space by said supply means can expand in an upstream direction toward said inlet end of said tube in the interior of said space and flow in a downstream direction from said intermediate zone through said gap into contact with the mixture issuing through the downstream outlet end of said tube.

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