Exhaust diffuser for an internal combustion engine

Abstract

An exhaust outlet apparatus for an internal combustion engine comprises an exhaust conduit having a first diameter, a nozzle section mounted on an outlet end of the exhaust conduit, the nozzle section having an outlet with a second diameter less than the first diameter, an elongated tube having an inlet and an outlet, mounted with the outlet of the nozzle disposed in the inlet of the elongated tube, the elongated tube having an inlet end portion with a solid wall and an outlet end portion with an apertured wall, and, a cap disposed on the outlet end of the elongated tube and closing an axial end of the elongated tube, the cap including a cylindrical wall portion radially spaced from the elongated tube and extending longitudinally at least over the outlet end portion of elongated tube.

1 . An exhaust outlet apparatus for an internal combustion engine, comprising:
 an exhaust conduit having a first diameter and an outlet;   an elongated tube having an inlet end and an outlet end, mounted with the outlet of the exhaust conduit disposed in the inlet end of the elongated tube to define an annular gap therebetween, the elongated tube having an inlet end portion with a solid wall and an outlet end portion with an apertured wall;   a cap disposed on the outlet end of the elongated tube and closing an axial end of the elongated tube; and,   a cylindrical walled element radially spaced from the elongated tube and extending longitudinally at least over the outlet end portion of elongated tube.   
   
   
       2 . The exhaust outlet apparatus of  claim 1 , further comprising a nozzle section mounted on an outlet end of the exhaust conduit, the nozzle section having an outlet with a second diameter less than the first diameter. 
   
   
       3 . The exhaust outlet apparatus of  claim 1 , further comprising an annular flange disposed on the inlet end portion of the elongated tube adjacent the inlet and extending radially outward therefrom. 
   
   
       4 . The exhaust outlet apparatus of  claim 1 , further comprising a shield surrounding the nozzle and elongated tube and radially spaced from both. 
   
   
       5 . The exhaust outlet apparatus of  claim 1 , wherein the shield comprises a cylindrical mesh walled body. 
   
   
       6 . The exhaust outlet apparatus of  claim 1 , wherein the inlet of the elongated tube has an outwardly flared entrance. 
   
   
       7 . The exhaust outlet apparatus of  claim 1 , wherein the cylindrical walled body and cap are formed as an integral piece. 
   
   
       8 . The exhaust outlet apparatus of  claim 1 , wherein the cylindrical walled body is radially spaced from the apertured wall portion of the elongated tube a sufficient amount to form a mixing space. 
   
   
       9 . The exhaust outlet apparatus of  claim 1 , further comprising a pipe connected to the nozzle to supply air from an air source to the nozzle.