Exhaust connection unit for catalytic converter and manufacturing method of exhaust connection unit for catalytic converter

Abstract

An exhaust connection unit for a catalytic converter for connecting a turbocharger and a warm-up catalytic converter provided in a downstream side of the turbocharger includes a flange of which one end is installed to the turbocharger, and a connection member integrally formed by using a single cylindrical pipe through bending, cutting, and hydro-forming molding, and where one end of the pipe is connected to the other end of the flange and the other end of the pipe is connected to the warm-up catalytic converter.

What is claimed is: 
     
         1 . An exhaust connection unit for a catalytic converter for connecting a turbocharger and a warm-up catalytic converter provided in a downstream side of the turbocharger, comprising:
 a flange of which one end is installed to the turbocharger; and   a connection member integrally formed by using a single cylindrical pipe through bending, cutting, and hydro-forming molding, and where one end of the pipe is connected to the other end of the flange and the other end of the pipe is connected to the warm-up catalytic converter.   
     
     
         2 . The exhaust connection unit for the catalytic converter of  claim 1 , wherein the flange comprises:
 a connection portion connected to the turbocharger; and   an insertion portion inserted into the connection member.   
     
     
         3 . The exhaust connection unit for the catalytic converter of  claim 2 , wherein a supporting step, by which one end of the connection member is supported, is formed between the connection portion and the insertion portion. 
     
     
         4 . The exhaust connection unit for the catalytic converter of  claim 1 , wherein the flange is formed by molding austenite-based carbon alloy steel. 
     
     
         5 . The exhaust connection unit for the catalytic converter of  claim 1 , wherein the connection member is formed by shaping a cylindrical shaped pipe into a “U” through bending-molding, cutting the U-shaped pipe and then expanding the entire shape and lateral ends of each cut pipe through hydro-forming molding. 
     
     
         6 . The exhaust connection unit for the catalytic converter of  claim 1 , wherein at least one sensor installation hole penetrating from the inside to the outside is formed in the connection member. 
     
     
         7 . The exhaust connection unit for the catalytic converter of  claim 1 , wherein the connection member is made of austenite-based carbon alloy steel. 
     
     
         8 . A method of manufacturing an exhaust connection unit for a catalytic converter for connecting a turbocharger and a warm-up catalytic converter provided in a downstream side of the turbocharger, comprising:
 manufacturing a flange through molding;   shaping a center portion of a single cylindrical pipe, made of the same material as the flange, into the shape of a “U” through bending-molding;   cutting the U-shaped pipe to shape the U-shaped pipe into the shape of an “L”;   forming a connection member by molding the entire exterior appearance of the pipe after the cutting step, and expanding lateral ends of the cut pipe through hydro-forming; and   coupling the flange to one end of the molded connection member by welding.   
     
     
         9 . The method for manufacturing the exhaust connection unit for the catalytic converter of  claim 8 , wherein the flange and the connection member are made of austenite-based carbon alloy steel.