Exhaust Gas-Discharging Device of Vehicle

Abstract

An exhaust gas discharge device for vehicles is disclosed. The exhaust gas discharge device of the present invention includes an extension pipe ( 10 ), which is fitted over a tail pipe of a silencer of a vehicle. A venturi passage ( 20 ) is defined in an exhaust gas inlet end of the extension pipe to increase a flow speed of the exhaust gas. The exhaust gas discharge device further includes an outside air discharge nozzle ( 30 ), which extends into the venturi passage, a backflow inlet port ( 40 ), which is provided in an exhaust gas outlet end of the extension pipe to guide outside air, and a cover ( 50 ), which defines therein a chamber, through which the backflow inlet port communicates with the outside air discharge nozzle. Thus, the present invention restrains backflow of exhaust gas using the flow of outside air, thus preventing back pressure, and rapidly discharging the exhaust gas, thereby enhancing the output of the engine.

1 . An exhaust gas discharge device for a vehicle, coupled to a tail pipe of a silencer of the vehicle to improve a flow of exhaust gas, and comprising:
 an extension pipe, with a venturi passage defined in an exhaust gas inlet end of the extension pipe to increase a flow speed of the exhaust gas; an outside air discharge nozzle extending into the venturi passage; a backflow inlet port provided in an exhaust gas outlet end of the extension pipe to guide inflow of outside air; and a cover fitted over the extension pipe to define therein a chamber, through which the backflow inlet port communicates with the outside air discharge nozzle.   
   
   
       2 . The exhaust gas discharge device for the vehicle according to  claim 1 , further comprising:
 a subsidiary venturi passage tube provided in the venturi passage, the subsidiary venturi passage being increased in diameter at opposite ends thereof, wherein the outside air discharge nozzle extends a predetermined length into the subsidiary venturi passage tube ( 22 ), so that an end of the nozzle communicates with the subsidiary venturi passage tube, and the subsidiary venturi passage tube is supported by the outside air discharge nozzle ( 30 ) at a center of the venturi passage.   
   
   
       3 . The exhaust gas discharge device for the vehicle according to  claim 1 , wherein the outside air discharge nozzle, which extends from the extension pipe into the venturi passage, is inclined in a direction in which the exhaust gas is discharged, and the outside air discharge nozzle comprises an inclined pipe, a diameter of which is reduced from the chamber to an air discharge end thereof. 
   
   
       4 . The exhaust gas discharge device for the vehicle according to  claim 1 , wherein the outside air discharge nozzle and the backflow inlet port respectively comprise at least two outside air discharge nozzles and at least two backflow inlet ports. 
   
   
       5 . The exhaust gas discharge device for the vehicle according to  claim 1 , wherein the extension pipe is sectioned into a first pipe, which is disposed adjacent to an inlet of the extension pipe, and a second pipe, which is disposed adjacent to an outlet of the extension pipe, wherein the first pipe has a bent part, which is provided in an end of the first pipe such that a diameter thereof is reduced to form the venturi passage, and the second pipe has a bent part in an end thereof, so that the first pipe and the second pipe are coupled to each other through the cover, such that the bent parts face each other, thus the bent parts, having the reduced diameters, serve as both the venturi passage and as a ring-shaped outside air discharge nozzle. 
   
   
       6 . The exhaust gas discharge device for the vehicle according to  claim 2 , wherein the outside air discharge nozzle, which extends from the extension pipe into the venturi passage, is inclined in a direction in which the exhaust gas is discharged, and the outside air discharge nozzle comprises an inclined pipe, a diameter of which is reduced from the chamber to an air discharge end thereof. 
   
   
       7 . The exhaust gas discharge device for the vehicle according to  claim 2 , wherein the outside air discharge nozzle and the backflow inlet port respectively comprise at least two outside air discharge nozzles and at least two backflow inlet ports.