Helmholtz muffler for vehicle

Abstract

A Helmholtz muffler for a vehicle may include a muffler housing having an internal space divided into a plurality of expansion chamber; a resonance chamber formed hermetically in a vehicle body member; and a connection tube configured to be connected to one of the expansion chambers of the muffler housing and to the resonance chamber.

What is claimed is: 
     
         1 . A Helmholtz muffler for a vehicle, the muffler comprising:
 a muffler housing having an internal space divided into a plurality of expansion chamber;   a resonance chamber formed hermetically in a vehicle body member; and   a connection pipe connected to at least one of the plurality of expansion chambers of the muffler housing and to the resonance chamber.   
     
     
         2 . The Helmholtz muffler for the vehicle of  claim 1 , wherein partitions by which a capacity of the resonance chamber is determined are disposed at a first side and a second side of the resonance chamber, respectively, and the partitions are integrally secured to the vehicle body member to form the resonance chamber. 
     
     
         3 . The Helmholtz muffler for the vehicle of  claim 1 , wherein the connection pipe is connected to and is in fluidic communication with an expansion chamber to which exhaust gas is lastly discharged from the muffler housing, among the plurality of expansion chambers. 
     
     
         4 . The Helmholtz muffler for the vehicle of  claim 1 , wherein the connection pipe is a bellows pipe which is configured to be movable according to movement of the muffler case. 
     
     
         5 . The Helmholtz muffler for the vehicle of  claim 4 , wherein an upper end portion and a lower end portion of the bellows pipe are secured to the resonance chamber in the vehicle body member and the muffler housing, respectively. 
     
     
         6 . The Helmholtz muffler for the vehicle of  claim 1 , further including:
 a first baffle and a second baffle mounted in the muffler housing in a longitudinal direction of the muffler housing and spaced from each other to form a space between a first side wall of the muffler housing and the first baffle as a first expansion chamber among the plurality of expansion chamber, to form a space between the first baffle and the second baffle as a second expansion chamber among the plurality of expansion chamber, and to form a space between a second side wall of the muffler housing and the second baffle as a third expansion chamber among the plurality of expansion chamber.   
     
     
         7 . The Helmholtz muffler for the vehicle of  claim 6 , further including:
 an internal tube passing through the first baffle and the second baffle and being disposed in the muffler housing; and   an exhaust pipe disposed outside the muffler housing and connected to a first end portion of the internal tube, wherein a second end portion of the internal tube is disposed in the third expansion chamber.   
     
     
         8 . The Helmholtz muffler for the vehicle of  claim 6 , further including:
 at least one external tube passing through the first baffle and the second baffle and disposed in the muffler housing,   wherein a first end portion of the at least one external tube is disposed in the first expansion chamber and a second end portion thereof is disposed to pass through the second side wall of the muffler housing and exposed outside the muffler housing.   
     
     
         9 . The Helmholtz muffler for the vehicle of  claim 7 , wherein a plurality of perforations is formed in the first end portion of the at least one external tube. 
     
     
         10 . The Helmholtz muffler for the vehicle of  claim 8 , further including:
 a muffler cap mounted on the second end portion of the at least one external tube.   
     
     
         11 . The Helmholtz muffler for the vehicle of  claim 6 , further including:
 a connection tube passing through the first baffle and the second baffle and fluidically-connecting the first expansion chamber and the third expansion chamber to be in fluidical communication with each other.   
     
     
         12 . The Helmholtz muffler for the vehicle of  claim 7 ,
 wherein a plurality of perforations is formed in a section among an entire length region of the internal tube, and   wherein the section of the internal tune is disposed in the third expansion chamber.   
     
     
         13 . The Helmholtz muffler for the vehicle of  claim 6 ,
 wherein a plurality of perforations is formed on the first baffle and the second baffle.   
     
     
         14 . The Helmholtz muffler for the vehicle of  claim 4 ,
 wherein the bellows pipe has a first male threaded portion formed on an upper end portion thereof,   wherein the resonance chamber in the vehicle body member has a second male threaded portion formed on an external surface thereof, and   wherein the first male threaded portion and the second threaded portion are fastened to each other by a fastening nut to connect the bellows pipe to the resonance chamber in the vehicle body member.   
     
     
         15 . The Helmholtz muffler for the vehicle of  claim 14 ,
 wherein the first male threaded portion further includes a stopper integrally formed at a lower end portion of an external circumferential region of the first male threaded portion for guiding a completion of the fastening nut and preventing a lowering of the fastening nut.