MUFFLER OF INTERNAL COMBUSTION ENGINE Russian patent published in 2006 - IPC F01N1/00 

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: proposed exhaust muffler contains cylindrical housing with end face covers, coaxial intake and outlet branch pipes perforated and partially placed in housing, cross perforated partition with attachment installed in zone of inlet of end face of outlet branch pipe. Inlet branch pipe is arranged in intake resonating chamber, and outlet branch pipe, in outlet resonating chamber. Attachment is made in form of truncated cone whose smaller base is plate with hole in middle bent inside outlet branch pipe and secured on its end face, base is pointed to side of outlet of outlet branch pipe and its ends are bent to side of intake branch pipe and are connected with housing by welding. Attachment is provided with perforation. Cross partition and attachment divide housing into intake and outlet resonating and intermediate expansion chamber. Cross partition arranged between intake and expansion chambers is provided with perforation only at periphery, and said perforation is made with tangential guides of trapezoidal cross section arranged at angle of 30°, and perforation of intake branch pipe is provided with tangential guides of trapezoidal cross section arranged at angle of 24°.

EFFECT: reduced noise by 3-4 dBA.

8 dwg