Exhaust apparatus of vehicle engine

Abstract

A substantially elliptic tubular muffler device mounted to a vehicle is provided. The muffler device is provided in such a manner that a center axis extends along a lateral direction of a vehicle. The muffler device is provided with an inlet portion introducing exhaust gas of an engine to the muffler device, and an outlet portion discharging the exhaust gas to the outside from the muffler device. The muffler device has a circumferential surface portion formed substantially in an elliptic tubular shape, and a pair of end plates provided in such a manner as to cover both end opening portions of the circumferential surface portion. The inlet portion is connected to one of a pair of end plates, and the outlet portion is connected to the circumferential surface portion.

1 . A vehicle comprising:
 a substantially elliptic tubular muffler device mounted to the vehicle, wherein the muffler device has a circumferential surface portion formed substantially in an elliptic tubular shape, and a pair of end plates provided in such a manner as to cover both end opening portions of the circumferential surface portion, and wherein the muffler device is provided in such a manner that a center axis extends along a lateral direction of the vehicle;   an inlet portion introducing exhaust gas of an engine to the muffler device; and   an outlet portion discharging exhaust gas to the outside from the muffler device,   the vehicle being characterized in that the inlet portion is connected to one of the end plates, and the outlet portion is connected to the circumferential surface portion.   
   
   
       2 . The vehicle according to  claim 1 , being characterized in that the outlet portion is connected to a portion having a large curvature in the circumferential surface portion. 
   
   
       3 . The vehicle according to  claim 2 , being characterized in that in the case of setting, as a first center line, a line dividing a longer diameter of the circumferential surface portion into two equal parts, the inlet portion is connected to a position which is shifted toward an upstream side of the exhaust gas than the first center line, with respect to the one end plate. 
   
   
       4 . The vehicle according to  claim 2 , being characterized in that in the case of setting, as a first center line, a line dividing a longer diameter of the circumferential surface portion into two equal parts, and setting, as a second center line, a line being orthogonal to the first center line and dividing the muffler device into two equal parts in a direction of the first center line,
 the outlet portion is provided at a position which is in an opposite side to the inlet portion with respect to the first center line, and is in an opposite side to the inlet portion with respect to the second center line.   
   
   
       5 . The vehicle according to  claim 2 , being characterized in that the inlet portion and the outlet portion are provided at diagonal positions in the muffler device. 
   
   
       6 . The vehicle according to  claim 2 , being characterized in that in the case of setting, as a first center line, a line dividing a longer diameter of the circumferential surface portion into two equal parts, and setting, as a second center line, a line being orthogonal to the first center line and dividing the muffler device into two equal parts in a direction of the first center line,
 a joint portion between the inlet portion and the end plate is provided at a position which is shifted from the first center line, or a joint portion between the outlet portion and the circumferential surface portion is provided at a position which is shifted from the second center line, in such a manner that a three-dimensional spaced distance between the joint portion between the inlet portion and the end plate, and the joint portion between the outlet portion and the circumferential surface portion is enlarged.   
   
   
       7 . The vehicle according to  claim 6 , being characterized in that the inlet portion is connected to a position which is shifted toward an upstream side of the exhaust gas, with respect to the end plate. 
   
   
       8 . The vehicle according to  claim 6 , being characterized in that the outlet portion is connected to a position which is shifted toward a downstream side of the exhaust gas, with respect to the circumferential surface portion. 
   
   
       9 . The vehicle according to  claim 6 , being characterized in that the inlet portion is connected to a position which is shifted toward an upstream side of the exhaust gas, with respect to the end plate, and the outlet portion is connected to a position which is shifted toward a downstream side of the exhaust gas, with respect to the circumferential surface portion. 
   
   
       10 . The vehicle according to  claim 1 , being characterized in that the inlet portion has a bent portion, and the outlet portion is formed in a straight pipe shape.