Construction of coupling exhaust pipes of vehicle

Abstract

An opening edge of an upstream-side exhaust pipe and an opening edge of a downstream-side exhaust pipe opposed to the opening edge of the upstream-side exhaust pipe are bent radially outward and thereafter radially inward by molding to form a circumference of the upstream-side exhaust pipe and a circumference of the downstream-side exhaust pipe as a flange portion respectively. After both flange portions are butted to each other through a gasket disposed therebetween, they are mechanically coupled to each other with a bolt and a nut.

1 . A construction of coupling exhaust pipes of a vehicle, wherein an opening edge of an upstream-side exhaust pipe and an opening edge of a downstream-side exhaust pipe opposed to said opening edge of said upstream-side exhaust pipe are bent radially outward to form a circumference of said upstream-side exhaust pipe and a circumference of said downstream-side exhaust pipe as a flange portion respectively; and in the state of said both flange portions are butted to each other through a sealing member disposed between said both flange portions, said both flange portions are mechanically coupled to each other by means of coupling members.  
   
   
       2 . A construction of coupling exhaust pipes of a vehicle, wherein an opening edge of an upstream-side exhaust pipe and an opening edge of a downstream-side exhaust pipe opposed to said opening edge of said upstream-side exhaust pipe are bent radially outward to form a circumference of said upstream-side exhaust pipe and a circumference of said downstream-side exhaust pipe as a flange portion respectively; and 
 after said both flange portions are butted to each other through a sealing member disposed between said both flange portions, said both flange portions are coupled to each other by means of a pair of sandwiching members which sandwiches said both flange portions therebetween at an outer side of each of said flange portions in a direction in which said both opening edges are opposed to each other.    
   
   
       3 . A construction of coupling exhaust pipes of a vehicle according to  claim 1 , wherein said flange portion is molded radially outward by bending said edges of said openings and radially inward at least once.  
   
   
       4 . A construction of coupling exhaust pipes of a vehicle according to  claim 3 , wherein said flange portion is formed by crushing in a longitudinal direction of a pipe at least one of adjacent bulged portions formed by bulging said pipe radially outward at an intermediate position of said pipe spaced at a predetermined interval from an opening of said pipe in such a way as to superimpose both slopes of each of said sectionally mountain-shaped bulged portions each other.  
   
   
       5 . A construction of coupling exhaust pipes of a vehicle according to  claim 2 , wherein said flange portion is molded radially outward by bending said edges of said openings and radially inward at least once.