Heat Insulator mounting structure

Abstract

According to the present invention, a heat insulator mounting structure able to reduce noise propagated around a vehicle is provided. The heat insulator mounting structure includes an exhaust pipe disposed so that an upper half surface thereof is positioned higher than a horizontal lower surface of a vehicle body, a first shield portion for covering an upper surface of the exhaust pipe above the horizontal lower surface of the vehicle body, and a pair of second shield portions extending downwards below the horizontal lower surface of the vehicle body from both ends of the first shield portion in the circumferential direction of the exhaust pipe.

1 . A heat insulator mounting structure comprising:
 an exhaust pipe disposed so that at least a portion of said exhaust pipe is positioned above a lower surface of a vehicle body;   a first shield portion for covering an upper surface of said exhaust pipe above the lower surface of the vehicle body; and   a pair of second shield portions extending downwards below the lower surface of the vehicle body from both ends of said first shield portion in the circumferential direction of said exhaust pipe.   
     
     
         2 . The heat insulator mounting structure according to  claim 1 , wherein said first shield portion and/or second shield portions include a perforated plate opposed to said exhaust pipe. 
     
     
         3 . The heat insulator mounting structure according to  claim 2 , wherein a space on an opposite side of said exhaust pipe with respect to said perforated plate is closed, through holes of said perforated plate opening to said space. 
     
     
         4 . The heat insulator mounting structure according to  claim 2 , wherein a space on an opposite side of said exhaust pipe with respect to said perforated plate, through holes of said perforated plate opening to said space, includes a plurality of closed spaces, said plural closed spaces having mutually different widths in a direction orthogonal to said perforated plate. 
     
     
         5 . The heat insulator mounting structure according to  claim 2 , wherein a space on an opposite side of said exhaust pipe with respect to said perforated plate, through holes of said perforated plate opening to said space, includes a plurality of closed spaces, the number of said through holes opening to each of said plural closed spaces and/or a diameter of said through holes being different between said plural closed spaces. 
     
     
         6 . The heat insulator mounting structure according to  claim 1 , wherein said first shield portion and second shield portions includes an inner plate-like member opposed to said exhaust pipe and an outer plate-like member disposed on a opposite side of said exhaust pipe with respect to said inner plate-like member so as to be opposed to said inner plate-like member, a space between said inner plate-like member and outer plate-like member is closed, said pair of second shield portions extend from both the ends of said first shield portion obliquely downwards so as to approach each other, and in said first shield portion a plurality of through holes are formed in said inner plate-like member, while in said second shield portions a plurality of through holes are formed in said outer plate-like portion. 
     
     
         7 . The heat insulator mounting structure according to  claim 1 , wherein the lower surface of the vehicle body includes a bent lower surface swelling upwards to form a depressed portion, at least a portion of said exhaust pipe is disposed within said depressed portion, said first shield portion is disposed between said bent lower surface and exhaust pipe, said second shield portions extend from both of the ends of said first shield portion in the circumferential direction of said exhaust pipe downwards below said depressed portion, said first shield portion and second shield portions are constituted by a single perforated plate, and a space between said bent lower surface and perforated plate is closed. 
     
     
         8 . The heat insulator mounting structure according to  claim 1 , wherein lower ends of said second shield portions are positioned at the same height as or higher than a lower end of said exhaust pipe. 
     
     
         9 . The heat insulator mounting structure according to  claim 1 , wherein spacing between said pair of second shield portions is equal to or larger than the outside diameter of said exhaust pipe. 
     
     
         10 . The heat insulator mounting structure according to  claim 1 , wherein lower ends of said second shield portions are positioned at the same height as or higher than a lower end of said exhaust pipe, and spacing between said pair of second shield portions is equal to or larger than the outside diameter of said exhaust pipe.