Exhaust Assembly For Use With A Combustion Engine

Abstract

An exhaust assembly having a first combustion gas flow route, a second combustion flow route, and a valve. The first combustion gas flow route includes at least one sound damper. The at least one sound damper is a high-frequency damper adapted to dampen primarily higher frequencies of the frequency spectrum being contained in the combustion gas. The second combustion gas flow route has substantially no sound damping, so that the first and second combustion gas flow routes have different damping characteristics. The valve is operable selectively by an operator and adapted to selectively divide an approximately constant stream of combustion gases from an engine selectively over the first and second combustion gas flow routes, irrespective of the volume of the combustion gase.

1 . An exhaust assembly for use with a combustion engine, said exhaust assembly comprising;
 a first combustion gas flow route, wherein the first combustion gas flow route includes at least one sound damper, said at least one sound damper being a high-frequency damper, wherein the high-frequency damper is adapted to dampen primarily higher frequencies of the frequency spectrum being contained in the combustion gas;   a second combustion gas flow route, wherein the second combustion gas flow route has substantially no sound damping, so that the first and second combustion gas flow routes have different damping characteristics; and   a valve operable selectively by an operator during use of the exhaust assembly with a combustion engine being coupled thereto, and wherein the valve is adapted to selectively divide an approximately constant stream of combustion gases from an engine over the first and second combustion gas flow routes, irrespective of the volume of the combustion gases.   
     
     
         2 . The exhaust assembly according to  claim 1 , in which the high-frequency damper is a closed sound-trapping chamber which is in communication with the first combustion gas flow route via sound passage openings, wherein the sound passage openings are not part of the first combustion gas flow route and substantially are not passed through by the combustion gas. 
     
     
         3 . The exhaust assembly according to  claim 2 , in which the sound-trapping chamber is filled with a damping material. 
     
     
         4 . The exhaust assembly according to  claims 1 , in which the exhaust assembly has a gas-tight housing and a perforated inner tube being placed at a distance therefrom, wherein the housing at one side thereof is closed around the inner tube, and wherein the valve is located for complete or partial closing of the inner tube, and wherein when the valve is opened, the second combustion gas flow route uninterruptedly extends through the inner tube in order to form a free flow route, while when the valve is closed, the first combustion gas flow route extends via the inner tube and perforation openings formed therein through a bypass duct between the inner tube and the housing, and wherein a cylindrical sound-trapping chamber is arranged in the housing which is in communication with the first combustion gas flow route via the sound passage openings. 
     
     
         5 . The exhaust assembly according to  claim 2 , in which the cylindrical sound-trapping chamber is formed by a gas-tight outer housing wall and a perforated inner sound passage wall. 
     
     
         6 . The exhaust assembly according to  claim 5 , in which a deflection element is provided in the first combustion gas flow route, by means of which the flow route of the combustion gases is extended along the perforated inner sound passage wall of the sound-trapping chamber. 
     
     
         7 . The exhaust assembly according to  claim 2 , in which additional sound passage openings are also provided between the second combustion gas flow route and the sound-trapping chamber. 
     
     
         8 . The exhaust assembly according to  claim 2 , in which additional sound passage openings are also provided between a common flow route, which is jointly formed by the first and the second combustion gas flow route, and the sound-trapping chamber. 
     
     
         9 . The exhaust assembly according to  claim 4 , in which the inner tube has sound passage openings which are not part of the first combustion gas flow route and substantially are not passed through by the combustion gas.