Abstract:
The present invention relates to a compressor ( 1 ) of an exhaust-gas turbocharger having a compressor housing ( 2 ) which has a compressor outlet connecting pipe ( 3 ), and having a sound absorber ( 4 ), wherein the sound absorber ( 4 ) is formed as a separate component which can be connected to the outlet connecting pipe ( 3 ).

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The invention relates to a compressor of an exhaust-gas turbocharger. 
     A generic compressor is known from WO 2005/124159 A1. 
     Description of the Related Art 
     Here, the compressor has a sound absorber element which is integrated in the compressor housing and which performs the sound absorbing function in the interior of the compressor. Said design has the disadvantage not only of being complex and expensive but rather also of not permitting sound-related adjustment without it being necessary to make changes to the compressor housing. 
     BRIEF SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide a compressor for a turbocharger of an internal combustion engine which overcomes the disadvantages mentioned above. 
     The compressor according to the invention has the advantage that it has a sound absorber which is formed as a separate component which is connected to an outlet connecting pipe of the compressor by means of assembly without screws. As a result of the use of lightweight materials for the sound absorber which is arranged outside the compressor housing, in relation to the abovementioned compressor of the prior art, not only is a weight reduction of the entire compressor assembly obtained but simplified adaptation to sound-related requirements without modification of the compressor housing is also enabled. 
     The subclaims relate to advantageous refinements of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       Further details, features and advantages of the invention will emerge from the following description of an exemplary embodiment and from the drawing, in which: 
         FIG. 1  shows a sectional view through a first embodiment of a sound absorber of the compressor according to the invention, 
         FIG. 2  shows a perspective view of the sound absorber of the compressor from  FIG. 1 , 
         FIG. 3  shows an illustration, corresponding to  FIG. 1 , of a second embodiment of the sound absorber of the compressor, 
         FIG. 4  shows an illustration, corresponding to  FIG. 2 , of the second embodiment of the sound absorber of the compressor, and 
         FIG. 5  shows a partially cut-away perspective view of a half-shell of the sound absorber of the compressor according to the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     A first embodiment of a compressor  1  according to the invention will be described in detail below on the basis of a juxtaposition of  FIG. 1  and  FIG. 2 . As can be seen from  FIG. 1 , the compressor  1 , of which only an outlet connecting pipe  3  can be seen here, has an annular sound absorber  4  which is arranged, as a separate component, on the outer side of the outlet connecting pipe  3 . 
     Two chambers  14 ,  15  which are divided by radial walls  22 ,  23  and  24  are formed in the interior of the sound absorber  4 , which chambers  14 ,  15  are connected to the interior of the outlet connecting pipe  3  via two radial connecting ducts  12 ,  13  and two connecting ducts  12 ′,  13 ′ arranged opposite the connecting ducts  12 ,  13 , and which chambers  14 ,  15  serve to generate sound absorption of the gas flow flowing out of the compressor housing (not illustrated). 
     A holding device  5  which is arranged on an end side  7 , which points away from the compressor  1 , of the sound absorber  4  has a multiplicity of clips, two of which clips are denoted, as representatives of all of the clips, by the reference numerals  8  and  9  in  FIG. 2 . 
     To fasten the sound absorber  4  to the outlet connecting pipe  3  of the compressor  1 , after the walls  22 ,  23 ,  24  of the two chambers  14 ,  15  of the sound absorber  4  have been pushed against three shoulders  3 ′,  3 ″,  3 ′″ which are formed on the outer circumference of the outlet connecting pipe  3 , the clips  8 ,  9  are clipped into an encircling holding groove  6  which is formed in the outlet connecting pipe  3 . In each case one seal  19 ,  20  and  21  is arranged between the shoulders  3 ′,  3 ″,  3 ′″ of the outlet connecting pipe  3  and the walls  22 ,  23 ,  24 , in order to seal off the sound absorber  4  with respect to the outside and to separate the two chambers  14  and  15 . 
       FIG. 3  illustrates a further embodiment of a sound absorber  4 ′ of the compressor  1  according to the invention. Here, identical components are denoted by the same reference symbols as in the first embodiment of  FIG. 1 . As can be seen from  FIG. 3 , the outlet connecting pipe  3  of the compressor  1  in this embodiment has, in contrast to the first embodiment, only one shoulder  3 ′″ and no holding device  5  formed on the sound absorber  4 ′, as in the first embodiment of  FIG. 1 . In this embodiment, to fasten the sound absorber  4 ′ on the outlet connecting pipe  3  of the compressor  1 , the sound absorber  4 ′ is pushed against the shoulder  3 ′″ of the outlet connecting pipe  3  and is fastened by means of a holding element  10  which is preferably designed as a circlip and engages into a holding groove  11  of the outlet connecting pipe  3 . A seal  17  is arranged between the shoulder  3 ′″ of the outlet connecting pipe  3  and the wall  24  of the sound absorber  4 , and a seal  18  is arranged between the wall  22  and the circlip  10 , in order to seal off the sound absorber  4 ′ to the outside. 
     The above-described embodiments of the sound absorber  4  and  4 ′ are constructed from two annular shell components or half shells  16 ,  16 ′ which can be connected to one another, with the perspective, partially cut-away view of  FIG. 5  illustrating only the half shell  16 , which is preferably formed as a plastic injection-molded part, of the sound absorber  4 ,  4 ′, and the chambers  14 ,  15  arranged therein. The two annular half shells  16 ,  16 ′ may be differently-shaped components or, for adaptation to an available installation space of the compressor housing  2 , may if necessary have a geometric shape differing from a circular cross section. To simplify assembly, the two half shells  16 ,  16 ′ are connected to one another preferably by means of plastic welding, adhesive bonding or by means of clips. It is alternatively also conceivable for a complete sound absorber housing to have more than two components. 
     To complement the disclosure, reference is explicitly made to the diagrammatic illustration of the invention in  FIGS. 1 to 5 . 
     LIST OF REFERENCE SYMBOLS 
     
         
         
           
               1  Compressor 
               2  Compressor housing 
               3  Outlet connecting pipe 
               3 ′,  3 ″,  3 ′″ Shoulder on outlet connecting pipe 
               4  Sound absorber 
               5  Holding device of the sound absorber 
               6  Holding groove in the outlet connecting pipe 
               7  End side pointing away from the compressor housing 
               8 ,  9  Clips 
               10  Holding element, circlip 
               11  Holding groove in the outlet connecting pipe 
               12 ,  13  Connecting duct 
               12 ′,  13 ′ Connecting duct 
               14 ,  15  Chambers 
               16 ,  16 ′ Shell component, half shell 
               17 ,  18  Seals 
               19 ,  20 ,  21  Seals 
               22 ,  23 ,  24  Radial walls of the sound absorber