Engine exhaust structure

Abstract

A temperature regulating material 31 for regulating a temperature of an exhaust manifold 11 is provided such that individual parts of the exhaust manifold 11 are uniformed in temperature. Heat transfer materials 31 A with high thermal conductivity are layered as the temperature regulating material 31 on a cover member 25 at an area corresponding to a high-temperature area HT of the exhaust manifold 11 . Heat shield materials 31 B are layered as the temperature regulating material 31 on the cover member 25 at an area corresponding to the low-temperature area LT of the exhaust manifold 11 . A heat dissipation material 31 C as the temperature regulating material 31 coats an outer surface of the area of the cover member 25 corresponding to the high-temperature area of the exhaust manifold 11.

1 . An engine exhaust structure provided with a temperature regulating material for regulating a temperature of an exhaust manifold such that individual parts of the exhaust manifold are uniformed in temperature. 
   
   
       2 . The engine exhaust structure according to  claim 1 , wherein a cover member is provided to cover the exhaust manifold, and heat transfer materials with high thermal conductivity are layered as the temperature regulating material on the cover member at an area corresponding to a high-temperature area of the exhaust manifold. 
   
   
       3 . The engine exhaust structure according to  claim 1 , wherein a cover member is provided to cover the exhaust manifold, and heat shield materials are layered as the temperature regulating material on the cover member at an area corresponding to a low-temperature area of the exhaust manifold. 
   
   
       4 . The engine exhaust structure according to  claim 1 , wherein a cover member is provided to cover the exhaust manifold, and temperature regulating materials are layered as the temperature regulating material on the cover member, an area of each of the temperature regulating materials corresponding to the high-temperature area of the exhaust manifold being made higher in thermal conductivity than an area of each of the temperature regulating materials corresponding to the low-temperature area of the exhaust manifold. 
   
   
       5 . The engine exhaust structure according to  claim 1 , wherein a cover member is provided to the exhaust manifold and a heat dissipation material as the temperature regulating material coats an outer surface of the area of the cover member corresponding to the high-temperature area of the exhaust manifold. 
   
   
       6 . The engine exhaust structure according to  claim 1 , wherein a cover is provided to cover the exhaust manifold, and heat transfer materials with high thermal conductivity are layered as the temperature regulating material between the cover member and the high-temperature area of the exhaust manifold. 
   
   
       7 . The engine exhaust structure according to  claim 1 , wherein a cover member is provided to cover the exhaust manifold, and heat shield materials are layered as the temperature regulating material on an area of the cover member corresponding to a low-temperature area of the exhaust manifold. 
   
   
       8 . The engine exhaust structure according to  claim 1 , wherein a cover member is provided to cover the exhaust manifold, and temperature regulating materials are layered as the temperature regulating material between the cover member and the exhaust manifold, an area of each of the temperature regulating materials corresponding to the high-temperature area of the exhaust manifold being made higher in thermal conductivity than an area of each of the temperature regulating materials corresponding to the low-temperature area of the exhaust manifold. 
   
   
       9 . The engine exhaust structure according to  claim 1 , wherein the exhaust manifold has a two-tiered structure with an inner member and an outer member in part or in all, and heat transfer materials with high thermal conductivity are layered as the temperature regulating material on the high-temperature area of the exhaust manifold between the inner member and the outer member. 
   
   
       10 . The engine exhaust structure according to  claim 1 , wherein the exhaust manifold has a two-tiered structure with an inner member and an outer member in part or in all, and heat shield materials are layered as the temperature regulating material on the low-temperature area of the exhaust manifold between the inner member and the outer member. 
   
   
       11 . The engine exhaust structure according to  claim 1 , wherein the exhaust manifold has a two-tiered structure with an inner member and an outer member in part or in all, and temperature regulating materials are layered as the temperature regulating material between the inner member and the outer member, an area of each of the temperature regulating materials corresponding to the high-temperature area of the exhaust manifold being made higher in thermal conductivity than an area of each of the temperature regulating materials corresponding to the low-temperature area of the exhaust manifold. 
   
   
       12 . The engine exhaust structure according to  claim 1 , wherein the high-temperature area of the exhaust manifold is an area that contains at least the collecting part.