Two-section air duct

Abstract

The invention relates to an air duct 1 for motor vehicles, having a two-section duct wall 3 which is formed by a covering element 4 used at least partially as the first duct wall section 3.1 and by a car body element used as the second duct wall section 3.2

1 - 10 . (canceled)  
     
     
         11 . A duct wall of an air duct for motor vehicles having a flow longitudinal axis, the duct wall at least partially encasing the flow longitudinal axis in the circumferential direction and comprising: 
 a first duct wall section, and    at least one second duct wall section,    wherein the first duct wall section is at least partially formed by a covering element, and    wherein the second duct wall section is at least partially formed by a car body element.    
     
     
         12 . The duct wall as claimed in  claim 11 , wherein the first duct wall section can be placed against the second duct wall section in a connectable and sealing manner in the circumferential direction with respect to the flow longitudinal axis.  
     
     
         13 . The air duct wall as claimed in  claim 11 , wherein an inside of the first duct wall section has, an inside of the second duct wall section has, or insides of the first and second duct wall sections have at least one acoustically active layer.  
     
     
         14 . The air duct wall as claimed in  claim 11 , wherein an inside of the first duct wall section has, an inside of the second duct wall section has, or insides of the first and second duct wall sections have a first acoustically active layer and at least one second acoustically active layer which is superimposed or arranged on the first acoustically active layer.  
     
     
         15 . The air duct wall as claimed in  claim 14 , wherein the first acoustically active layer has a greater volume weight than the second acoustically active layer.  
     
     
         16 . The air duct wall as claimed in  claim 14 , wherein the first acoustically active layer is designed as a high-pass filter with respect to noise frequency and the second acoustically active layer is designed as a low-pass filter.  
     
     
         17 . The air duct wall as claimed in  claim 11 , wherein a sealing element is provided between the first duct wall section and the second duct wall section.  
     
     
         18 . The air duct wall as claimed in  claim 11 , wherein at least one releasable connecting element is provided between the first duct wall section and the second duct wall section.  
     
     
         19 . The air duct wall as claimed in  claim 11 , wherein the first duct wall section has two sides which can be placed with their end faces onto the second duct wall section.  
     
     
         20 . The air duct wall as claimed in  claim 11 , wherein the first duct wall section is of L- or U-shaped design in cross section, and wherein sides thereof run, with respect to a flow cross section, approximately parallel to the second duct wall part to form two limbs of a profile.  
     
     
         21 . The air duct wall as claimed in  claim 12 , wherein an inside of the first duct wall section has, an inside of the second duct wall section has, or insides of the first and second duct wall sections have at least one acoustically active layer.  
     
     
         22 . The air duct wall as claimed in  claim 12 , wherein an inside of the first duct wall section has, an inside of the second duct wall section has, or insides of the first and second duct wall sections have a first acoustically active layer and at least one second acoustically active layer which is superimposed or is arranged on the first acoustically active layer.  
     
     
         23 . The air duct wall as claimed in  claim 22 , wherein the first acoustically active layer has a greater volume weight than the second acoustically active layer.  
     
     
         24 . The air duct wall as claimed in  claim 22 , wherein the first acoustically active layer is designed as a high-pass filter with respect to noise frequency and the second acoustically active layer is designed as a low-pass filter.  
     
     
         25 . The air duct wall as claimed in  claim 12 , wherein a sealing element is provided between the first duct wall section and the second duct wall section.  
     
     
         26 . The air duct wall as claimed in  claim 12 , wherein at least one releasable connecting element is provided between the first duct wall section and the second duct wall section.  
     
     
         27 . The air duct wall as claimed in  claim 12 , wherein the first duct wall section has two sides which can be placed with their end faces onto the second duct wall section.  
     
     
         28 . The air duct wall as claimed in  claim 12 , wherein the first duct wall section is of L- or U-shaped design in cross section, and wherein sides thereof run, with respect to a flow cross section, approximately parallel to the second duct wall part to form two limbs of a profile.  
     
     
         29 . The air duct wall as claimed in  claim 13 , wherein a sealing element is provided between the first duct wall section and the second duct wall section.  
     
     
         30 . The air duct wall as claimed in  claim 13 , wherein at least one releasable connecting element is provided between the first duct wall section and the second duct wall section.