A NOVEL EXHAUST MUFFLER INTERNAL STRUCTURE FOR AN INTERNAL COMBUSTION ENGINE

摘要

The present invention discloses novel exahust muffler internal structure for attenuation of typical low frequency pulsating noise of an internal combustion engine. The said muffler structure is capable of reducing both low frequency as well as high frequency noise effectively. The present muffler structure comprises; at least two halves each having at least two shell or layers forming inner and outer shell joined together to constitute muffler housing ; plurality of non perforated hollow cylindrical members 1,4,5,6 having varying length; at least one perforated hollow cylindrical member 8; at least two non perforated baffle plates 2,3 joined to said inner shell for providing support to said hollow cylindrical members and constituting of at least three compartments, one reflection and two expansion chamber within said mufller housing; sound absorbing material 7 disposed around said perforated hollow cylindrical member 8; splitable cylindrical shell 9, covers said sound absorbing material 7 on said hollow cylindrical member 8, for absorption to reduce the high frequency noise produced by the gases. Exhaust gas from exhaust manifold of engine is subjected to expansion, reflection and absorption process in the muffler. The volume of the expansion and reflection chambers can be varied by changing the position of baffle plate to cater to the required ranges of frequency. The present invention integrates the pre silencer, main silencer, post silencer into a single silencer package which performs all desired function of pre silencer, main silencer and post silencer.