Exhaust system of a turbo-charged engine

Abstract

An exhaust system of a turbo-charged engine includes an exhaust pipe connected to a turbo-charged engine, a front muffler, and a rear muffler disposed in the exhaust pipe in an order of the front muffler and the rear muffler in a direction of flow of exhaust gas. Each muffler of the front muffler and the rear muffler includes an inner pipe. The inner pipe extends straight and continuously from an inlet to an outlet of each muffler and is not throttled in diameter between the inlet and the outlet of each muffler. Each muffler does not include an enlarged chamber in each muffler. The front muffler includes a high-frequency resonance chamber outside the inner pipe. The rear muffler includes a high-frequency resonance chamber and a low-frequency resonance chamber outside the inner pipe.

1 . An exhaust system of a turbo-charged engine comprising: 
 an exhaust pipe connected to said turbo-charged engine, and    a front muffler and a rear muffler disposed in said exhaust pipe in an order of said front muffler and said rear muffler in a direction of flow of an exhaust gas,    wherein each muffler of said front muffler and said rear muffler includes an inner pipe, said inner pipe extending straight and continuously from an inlet to an outlet of said each muffler and being not throttled in a diameter between said inlet and said outlet of said each muffler, said each muffler not including an enlarged chamber in said each muffler.    
     
     
         2 . An exhaust system of a turbo-charged engine according to  claim 1 , wherein said front muffler includes a high-frequency resonance chamber outside said inner pipe, and said rear muffler includes a high-frequency resonance chamber and a low-frequency resonance chamber outside said inner pipe.  
     
     
         3 . An exhaust system of a turbo-charged engine according to  claim 2 , wherein said low-frequency resonance chamber and said high-frequency resonance chamber outside said inner pipe of said rear muffler are disposed in an order of said low-frequency resonance chamber and said high-frequency resonance chamber in the direction of flow of the exhaust gas.  
     
     
         4 . An exhaust system of a turbo-charged engine according to  claim 2 , wherein each of said inner pipe of said front muffler and said inner pipe of said rear muffler includes, at a portion of said each inner pipe outside which said high-frequency resonance chamber is located, a louver hole formed therein for letting an interior of said each inner pipe and said high-frequency resonance chamber outside said portion of said each inner pipe communicate with each other.  
     
     
         5 . An exhaust system of a turbo-charged engine according to  claim 2 , wherein an interior of each of said high-frequency resonance chamber outside said inner pipe of said front muffler and said high-frequency resonance chamber outside said inner pipe of said rear muffler is a vacant space which is not filled with any sound absorbing material.