Exhaust-Cleaning Device For Internal Combustion Engines Besides a Vehicle Comprising Such an Exhaust-Cleaning Device and an Extension for Exhaust-Cleaning Devices

Abstract

An exhaust-cleaning device for internal combustion engines having varying exhaust amount, which is intended to constitute a part of an exhaust system co-operating with an engine includes a main converter and a pre-converter located upstream the main converter, seen in the direction that exhaust fumes are intended to pass the exhaust-cleaning device. The exhaust-cleaning device is distinguished by a bypass arranged in the area of the pre-converter. The bypass includes a first opening upstream the pre-converter, and a second opening downstream the pre-converter and upstream the main converter, so that at least a part of the exhaust fumes passes past the pre-converter without passing therethrough. An extension for an exhaust-cleaning device and a vehicle including such an exhaust-cleaning device are disclosed.

1 . Exhaust-cleaning device for internal combustion engines having varying exhaust amount, which is intended to constitute a part of an exhaust system cooperating with an engine and which comprises a main converter ( 2 ) and a pre-converter ( 3 ), which is located upstream the main converter ( 2 ), seen in the direction that the exhaust fumes are intended to pass the exhaust-cleaning device, in the area of the pre-converter ( 3 ) a bypass ( 8 ) being arranged, which includes a first opening ( 10 ), which mouths upstream the pre-converter ( 3 ), and a second opening ( 11 ), which mouths downstream the pre-converter ( 3 ) and upstream the main converter ( 2 ), so that at least a part of the exhaust fumes should be able to pass past the pre-converter ( 3 ) without passing through the same, characterized in that, in the direction upstream from the pre-converter ( 3 ), a collar ( 12 ) projects, which tapers in the direction upstream. 
     
     
         2 . Exhaust-cleaning device according to  claim 1 , characterized in that the pre-converter ( 3 ) is accommodated in a housing ( 4 ), the cross section area of which is larger than the cross section area of said pre-converter ( 3 ), a space formed between the pre-converter ( 3 ) and the housing ( 4 ) constituting said bypass ( 8 ). 
     
     
         3 . Exhaust-cleaning device according to  claim 2 , characterized in that the pre-converter ( 3 ) is radially retreated from said housing ( 4 ) by means of a number of stays ( 9 ). 
     
     
         4 . Exhaust-cleaning device according to  claim 2 , characterized in that the pre-converter ( 3 ) is concentrically arranged in relation to the housing ( 4 ). 
     
     
         5 . Exhaust-cleaning device according to  claim 1 , characterized in that the same includes an inlet sleeve ( 5 ), which tapers in the direction downstream. 
     
     
         6 . Exhaust-cleaning device according to  claim 5 , characterized in that said inlet sleeve ( 5 ), in the direction downstream, ends radially inside said collar ( 12 ). 
     
     
         7 . Exhaust-cleaning device according to  claim 2 , characterized in that the pre-converter ( 3 ) and the main converter ( 2 ) are accommodated in said housing ( 4 ). 
     
     
         8 . Exhaust-cleaning device according to  claim 1 , characterized in that the axial distance between the pre-converter ( 3 ) and the main converter ( 2 ) is smaller than 20 mm. 
     
     
         9 . Extension for an exhaust-cleaning device ( 1 ), which comprises a main converter ( 2 ) and a pre-converter ( 3 ), which is located upstream the main converter ( 2 ), seen in the direction that the exhaust fumes are intended to flow, characterized in that the same includes a first opening ( 10 ), which is connectable upstream the pre-converter ( 3 ), and a second opening ( 11 ), which is connectable downstream the pre-converter ( 3 ) and upstream the main converter ( 2 ), the extension forming a bypass ( 8 ), and in the direction upstream from the pre-converter ( 3 ), a collar ( 12 ) projecting, which tapers in the direction upstream. 
     
     
         10 . Vehicle comprising an engine and an exhaust system extending from the same, which exhaust system comprises an exhaust-cleaning device ( 1 ), which includes a main converter ( 2 ) and a pre-converter ( 3 ), which is located upstream the main converter ( 2 ), seen in the direction of flow of the exhaust fumes, the exhaust-cleaning device ( 1 ) comprising a bypass ( 8 ), which includes a first opening ( 10 ), which mouths upstream the pre-converter ( 3 ), and a second opening ( 11 ), which mouths downstream the pre-converter ( 3 ) and upstream the main converter ( 2 ), so that the exhaust fumes should be able to pass past the pre-converter ( 3 ) without passing through the same, characterized in that, in the direction upstream from the pre-converter ( 3 ), a collar ( 12 ) projects, which tapers in the direction upstream. 
     
     
         11 . Exhaust-cleaning device according to  claim 3 , characterized in that the pre-converter ( 3 ) is concentrically arranged in relation to the housing ( 4 ). 
     
     
         12 . Exhaust-cleaning device according to  claim 2 , characterized in that the same includes an inlet sleeve ( 5 ), which tapers in the direction downstream. 
     
     
         13 . Exhaust-cleaning device according to  claim 3 , characterized in that the same includes an inlet sleeve ( 5 ), which tapers in the direction downstream. 
     
     
         14 . Exhaust-cleaning device according to  claim 4 , characterized in that the same includes an inlet sleeve ( 5 ), which tapers in the direction downstream. 
     
     
         15 . Exhaust-cleaning device according to  claim 3 , characterized in that the pre-converter ( 3 ) and the main converter ( 2 ) are accommodated in said housing ( 4 ). 
     
     
         16 . Exhaust-cleaning device according to  claim 4 , characterized in that the pre-converter ( 3 ) and the main converter ( 2 ) are accommodated in said housing ( 4 ). 
     
     
         17 . Exhaust-cleaning device according to  claim 5 , characterized in that the pre-converter ( 3 ) and the main converter ( 2 ) are accommodated in said housing ( 4 ). 
     
     
         18 . Exhaust-cleaning device according to  claim 6 , characterized in that the pre-converter ( 3 ) and the main converter ( 2 ) are accommodated in said housing ( 4 ).