Air inlet system for an internal combustion engine

An air inlet system for an internal combustion engine, comprising:

• an inlet duct for furnishing charge air to engine cylinders;
• a combination port formed in said inlet duct for inducting both recirculated exhaust gas and charge air into an engine;
• an EGR injector mounted within said combination port, with said EGR injector comprising:
• a central EGR supply passage extending generally parallel to the direction of said charge air flow through said combination port;
• and
• a flow director mounted at a downstream end of said EGR supply passage and, in combination with said EGR supply passage, defining an annular EGR discharge orifice, with said EGR supply passage and said flow director cooperating to cause recirculated exhaust gas to enter said combination port radially;
• and
• a flow guide formed as one piece with said flow director, with said flow guide being located upstream from said flow director, with said flow guide comprising:
• an aerodynamic projection for causing charge air to move around said flow director;
• and
• a swirl generator comprising a plurality of radially directed vanes, with each of said vanes having a first end joined to said aerodynamic projection and a second end joined to a common peripheral ring, with said vanes adapted to impart a swirling motion to charge air flowing through said combination port.

An air inlet system for an internal combustion engine, comprising:

• an inlet duct for furnishing charge air to engine cylinders;
• a combination port formed in said inlet duct for inducting both recirculated exhaust gas and charge air into an engine;
• a one-piece EGR injector mounted within said combination port, with said EGR injector comprising:
• a central EGR supply passage extending generally parallel to the direction of said charge air flow through said combination port;
• and
• an integral, unitary, flow director incorporated in a bulkhead mounted at a downstream end of said EGR supply passage and, in combination with said EGR supply passage, defining a plurality of EGR discharge orifices, with said orifices causing recirculated exhaust gas to enter said combination port radially;
• and
• a flow guide configured as one piece with said flow director, with said flow guide being located upstream from said flow director, with said flow guide comprising:
• an aerodynamic projection for causing charge air to move around said flow director;
• and
• a swirl generator comprising a plurality of radially directed vanes, with each of said vanes having a first end joined to said aerodynamic projection and a second end joined to a common peripheral ring, with said vanes adapted to impart a swirling motion to charge air flowing through said combination port.

An air inlet system for an internal combustion engine, comprising:

• an inlet duct for furnishing charge air to engine cylinders;
• a generally cylindrical combination port formed in said inlet duct for inducting both recirculated exhaust gas and charge air into an engine;
• a one-piece EGR injector mounted within said combination port, with said EGR injector comprising:
• a central EGR supply passage cantilevered axially into said combination port and extending generally parallel to the direction of said charge air flow through said combination port;
• and
• an integral, unitary, flow director incorporated in a bulkhead mounted at a downstream end of said EGR supply passage and, in combination with said EGR supply passage, defining a plurality of EGR discharge orifices, with said orifices causing recirculated exhaust gas to enter said combination port radially, with said flow director further comprising a generally ogive-shaped aerodynamic projection for causing charge air to move smoothly around said flow director.