Abstract:
In a radiator module for a motor vehicle, a detachable connection is required between a housing of an electric motor and a retaining structure, which connection allows economic and secure assembly and cannot be loosened or detached by alternating reaction forces at the electric motor. To achieve this, an arrangement is proposed of a retaining structure and detachably connected therewith a housing for an electric motor, in which the housing has a number of radiating protruding tabs on the base side which can be inserted by successive tilt and shift movements in corresponding recesses of the retaining structure. Furthermore various methods for assembly are proposed.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application is a National Stage Application of PCI International Application No. PCT/DE2010/001222 (filed on Oct. 21, 2010), under 35 U.S.C. §371, which claims priority to German Patent Application No. 10 2009 050 370.6 (filed on Oct. 22, 2009), which are each hereby incorporated by reference in their respective entireties. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention concerns a connection between an electric motor and a holder and in particular the design of a detachable connection between an electric motor of a radiator fan and a retaining structure of a radiator module on a motor vehicle. Furthermore, the present invention concerns a method for assembly of a radiator module with an electric motor and a retaining structure. 
       BACKGROUND OF THE INVENTION 
       [0003]    U.S. Pat. No. 7,318,394 B2 shows a radiator arrangement or a radiator module for a motor vehicle with a. fan and a heat exchanger. The fan comprises an electric motor with an impeller wheel mounted axially on the shaft. A retaining structure is provided to hold the electric motor in a pre-specified position on the heat exchanger. Also disclosed is various conventional designs of the connection between the housing of the electric motor and the retaining structure, This connection has particular importance in view of the cost of installation of the radiator arrangement. Connections with as few as possible bolts or other fixing elements of complicated fit require fewer manual measures and reduce the assembly costs. The connections described. therein document essentially achieve this by catch, snap catch or twist lock connections which are created by insertion of the electric motor in the receiving point with or without additional twisting. However with the conventional connections described, the disadvantage remains that the forces acting on the electric motor can loosen or release the connection. 
       SUMMARY OF THE INVENTION 
       [0004]    The present invention is therefore based on the object of creating a detachable connection between a housing of an electric motor and a retaining structure, which connection cannot be loosened or detached by alternating reaction forces. 
         [0005]    In a second aspect the invention faces the object of providing a method for installing an electric motor in a retaining structure of a radiator arrangement, which method creates a detachable connection reliably unaffected by reaction forces. 
         [0006]    With regard to the device, the present invention achieves this object by an arrangement with the features of a retaining structure and detachably connected therewith a housing for an electric motor, wherein the housing has a number of radiating protruding tabs on the base which can be inserted by successive tilt and shift movements into corresponding recesses of the retaining structure. Furthermore the present invention achieves this object with various assembly methods. 
         [0007]    Advantageous embodiments and refinements of the present invention are given in the subclaims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]    The invention is described below with reference to embodiment examples shown in the drawings, which show: 
           [0009]      FIG. 1  is a schematic simplified perspective view of a first preferred embodiment. of an electric motor for a radiator fan from behind, 
           [0010]      FIG. 2  is a schematic simplified perspective detailed view of the base tabs on the housing of the electric motor of  FIG. 1 . 
           [0011]      FIG. 3  is a schematic simplified perspective view of part of a first preferred embodiment of a retaining structure in a vehicle radiator in the region of the holder for the housing of the electric motor of  FIG. 1 . 
           [0012]      FIG. 4  is a schematic simplified perspective view of a step in the installation of the electric motor of  FIG. 1  in the retaining structure of  FIG. 2 . 
           [0013]      FIG. 5  is a schematic simplified perspective view of a step following the step of  FIG. 4  in the installation of the electric motor of  FIG. 1  in the retaining structure of  FIG. 2 . 
           [0014]      FIG. 6  is a schematic simplified perspective view of a step following the step of  FIG. 5  in the installation of the electric motor of  FIG. 1  in the retaining structure of  FIG. 2 . 
           [0015]      FIG. 7  is a schematic simplified perspective view of a third preferred embodiment of an electric motor for a radiator fiat from the back. 
           [0016]      FIG. 8  is a schematic simplified perspective view of part of a third preferred embodiment of a retaining structure in a vehicle radiator in the region of the holder for the housing of the electric motor of  FIG. 7 . 
           [0017]      FIG. 9  is a schematic simplified perspective overall view of the electric motor with mounted impeller wheel and the retaining structure in the third preferred embodiment before assembly. 
           [0018]      FIG. 10  is the assemblies of  FIG. 9  in a situation after assembly. 
       
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
       [0019]    In accordance with  FIGS. 1 to 6 , a first preferred embodiment of an arrangement in accordance with the invention. includes a. retaining structure  1  and detachably connected therewith a housing  14  of an electric motor  13 . The housing  14  shown here is a flat, semi-open., approximately cylindrical housing as typical of internal pole motors and electronically commutated motors with fixed internal winding frequently used in radiator fans. The housing  14  on the base side, i.e. opposite the output side, has a number of radiating protruding tabs  15 ,  16 ,  17 ,  18 ,  19 . The term radiating in the present case designates merely the circumstance that various tabs distributed over the periphery protrude from the outer surface. Tabs  15 ,  16 ,  17 ,  18 ,  19  need not necessarily be evenly distributed over the entire angular region, be symmetrically designed or oriented radially. The first arrangement mentioned has five tabs  15 ,  16 ,  17 ,  18 ,  19 . 
         [0020]    Two first tabs  15 ,  16  are close together and arranged protruding approximately parallel about a radial direction in order to be inserted into corresponding pocket-like recesses  3 ,  4  of the retaining structure  1  in a direction running transverse to the motor axis A. The raised edges at the ends, in particular in accordance with  FIG. 2 , ensure a particularly sati, seat. Three further tabs  17 ,  18 ,  19  are distributed along the periphery. Here one of these tabs  1 . 9  lies opposite the first pair of tabs  15 ,  16 , the other two tabs  17 ,  18  are arranged opposite each other, each offset by approximately one quarter of a circle to the left and right. The further tabs  17 ,  18 ,  19  have a. flat form which allows insertion in flatly lowered recesses  5 ,  6 ,  7  in the direction of the motor axis A. 
         [0021]    Tabs  17 ,  18  includes means for preventing, after insertion in the corresponding recesses  3 ,  4 , a shift of the housing  2  against the retaining structure  1  in the plane of the contact surface of tabs  15 ,  16 ,  17 ,  18 ,  19 . instead of the peg-hole fits  8 ,  9  shown in the drawing, naturally with equal success a fit along the outer contour of tabs  17 ,  18  can be considered. 
         [0022]    In the first embodiment described above, with few actions a mechanically strong but still detachable connection can be created between the housing  14  and the retaining structure  1 . For this the housing  14 , in a position tilted in relation to the installation position, is first inserted with the pair of first tabs  15 ,  16  into the corresponding pocket-like recesses  3 ,  4  of the retaining structure  1 . Preferably as shown in the respective drawings, suitable stops  10 ,  11  limit the insertion depth. From this position, the housing  14  is oriented into the installation position, whereby the further tabs  17 ,  18 ,  19  become fully immersed in the corresponding flatly lowered recesses  5 ,  6 ,  7  provided. The peg-hole fits at tabs  17 ,  18  cause a locking of the housing  2  against a further shift in the plane of the base. After insertion of a fixing means and preferably a screw  23  at one of the further tabs  19 , a tilting necessary for detaching the housing  14  from the holder is prevented. Screw  23  here transmits only slight forces of the tilt moment provoked by the weight of the electric motor  13 . The essential reaction forces are transmitted by tabs  15 ,  16 ,  17 ,  18 ,  19  to recesses  3 ,  4 ,  5 ,  6 ,  7 . 
         [0023]    A second preferred embodiment of the present invention not shown in the drawings is obtained by a slight change to the first embodiment described above in relation to the shape of the tabs and recesses. Here firstly the pocket-like recesses on the top are cut away. This gives a reduced movement of the housing for insertion of the respective first tabs which are also designed straight at their ends. The peg-hole fits provided in the first preferred embodiment between the further side tabs and the corresponding recesses are furthermore converted into peg-slot fits which allow a slight movement. The recess belonging to the further tab lying opposite the first tabs finally has a small shoulder. This is dimensioned in relation to the tab such that when the first tabs are fully inserted in the opposing recesses, it no longer makes contact with the outer edge of the tab. As a result a shift between housing and retaining structure in the fully oriented position of the electric motor is prevented. Again a small screw is provided to prevent the electric motor from tilting back out of the installation position. 
         [0024]    A third preferred embodiment of the present invention similar to the second preferred embodiment is illustrated in  FIGS. 7 and 8 . This third embodiment has a total of just three tabs  15 ,  16 ,  19 , The two symmetrically arranged tabs  15 ,  16  pointing downward correspond to the first tabs in the first and second embodiments described. The function of the tab opposite these tabs is performed by the third tab  19  in the third embodiment. The pocket-like recesses  3 ,  4  corresponding to the symmetrically arranged tabs  15 ,  16 , as illustrated in  FIG. 8  and like in the second embodiment described, are lowered or cut away in the direction of assembly and allow a slightly offset insertion from the front. Via the third tab  19 , in the installation position, in the third embodiment again the housing  14  is blocked against shifting by a step inside the corresponding recess. Again a screw  23  secures the housing  14  against tipping back out of the installation position. 
         [0025]    Installation of the electric motor  13  in the retaining structure  1  is completed by the steps described below for the second and third embodiments described. First the electric motor  13  is brought out of an eccentric position, slightly tilted in relation to its operating position, to the retaining structure  1  in the direction of the motor axis A, Here the first tabs  15 ,  16  come to rest in the lowered region of the corresponding recesses  3 ,  4 , Tab  19  and any further tabs in this situation still lie incompletely in the corresponding flatly lowered recesses. The tab  19  opposite the first tabs  15 ,  16  from above meets against the step in the recess  7 . In this position, the housing  14  can be shifted slightly in the direction of the first tabs  15 ,  16 . These are then completely immersed in the pocket-like recesses  3 ,  4  and engage behind the bow-shaped sections. Suitably designed stops again limit the insertion depth and ensure a central orientation of the first tabs  15 ,  16 . In the hilly inserted position, the protruding edge of the tab  19  opposite the first tabs  15 ,  16  lies next to the step. As a result the housing  14  can be tilted into its installation position. After fitting the screw  22 , tilting back is prevented. 
         [0026]    The second and third preferred embodiments described require a substantially smaller tilting of the electric motor on installation than the first preferred embodiment. As a result these embodiments are particularly suitable if the electric motor  13  with pre-mounted impeller wheel  22  is to be inserted in the retaining structure  1 . This is shown schematically in  FIGS. 9 and 10 . A smaller tilt angle requires less clearance between the outer edge of the impeller wheel  22  and the adjacent spokes  2  of the retaining structure  1 . 
         [0027]    Although embodiments have been described herein, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art 
       LIST OF REFERENCE NUMERALS 
       [0028]    Retaining structure  1   
         [0029]    Spokes  2   
         [0030]    Recesses  3 ,  4 ,  5 ,  6 ,  7   
         [0031]    Pegs  8 ,  9   
         [0032]    Stops  10 ,  11   
         [0033]    Fan  12   
         [0034]    Electric motor  13   
         [0035]    Housing  14   
         [0036]    First tabs  15 ,  16   
         [0037]    Further tabs  17 ,  18 ,  19   
         [0038]    Impeller wheel  22   
         [0039]    Screw  23