Abstract:
The invention relates to a door-frame for a vehicle door, whose lateral parts are configured as die-cast parts. This enables a large number of functional parts of the door to be integrated into the lateral parts and the overall number of door-frame parts to be reduced in comparison with door-frames in prior art.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    The invention relates to a door-frame for a vehicle door which comprises first and second die cast lateral parts and at least two struts connecting the lateral parts, wherein a receiver for deflection rollers and a receiver for a window-lifter drive are integrated into the first and second lateral parts.  
           [0002]    Vehicle doors, especially for automotive vehicles, which are constructed of a door-frame with an outer covering and an inner lining, are known. The door-frame provides the necessary stability for a vehicle door and carries, in addition to the trim, the functional elements such as the window-lifter for the mobile window-pane, as well as the necessary guide rails, door-lock with actuating handle, door-hinges and, if necessary, the mounting plate for an exterior mirror. The door-frames are usually formed from extruded sections welded to each other which are bent into the necessary shape before being connected. To strengthen the frame and accommodate the functional elements, additional sections, belts or plates must be welded on. The side impact beam which is usual nowadays in vehicle doors is also welded into the frame. A door-frame according to the prior art thus comprises many individual parts which are joined and welded together in a time-consuming and thus also cost-intensive manner. The frame parts are constructed of aluminium or magnesium alloys known to the person skilled in the art.  
         SUMMARY OF THE INVENTION  
         [0003]    The object of the invention, therefore, is to provide a vehicle door-frame which has a reduced number of individual parts, and thus also a reduced cost for welding the individual parts. The production costs are reduced, and high functional integration is achieved.  
           [0004]    The door-frame according to the invention is formed from two lateral parts and at least two struts connecting the two lateral parts. The side impact beam, which is largely standard in vehicle doors nowadays, can be introduced as the third strut at an appropriate place, but is not necessary for the invention per se. Also not absolutely necessary is an upper window-frame part which upwardly terminates the window region and interconnects the upper ends of the window guide rails.  
           [0005]    The lateral parts are preferably die-cast parts. Suitable as the material for the lateral parts are light metal alloys known to the person skilled in the art, such as those formed from aluminium or magnesium for example. The die-cast parts offer the possibility of easily realizing the required outer and inner contours according to the vehicle design. The necessary mountings or receivers for the functional elements and the trims are incorporated structurally. The need for additional attachment of plates and belts or the like, which have to be produced separately, as means of securing the functional parts, disappears.  
           [0006]    For the connecting struts, preferably extruded sections are used, the material of which is selected to suit the material of the lateral parts.  
           [0007]    By comparison with the prior art, depending on the embodiment with or without an upper window-frame part  5 , the number of individual frame parts is reduced to 5 or respectively 6, counting in the side impact beam which is not necessary. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0008]    The invention will now be explained in greater detail with the aid of FIGS. 1 and 2.  
         [0009]    [0009]FIG. 1 shows a door-frame according to the invention, without functional parts,  
         [0010]    [0010]FIG. 2 shows the door-frame as in FIG. 1 but with a window in the closed state and the window-lifter mechanism. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0011]    In FIG. 1, 1 designates the first, or right-hand, lateral part of the door-frame,  2  the lower strut,  3  the side impact section,  4  the upper strut, also called the sill,  5  the window-frame part which can be absent on doors with so-called frameless windows, and  6  the second, or left-hand, lateral part. The parts with the reference numerals  2  to  5  are also described in their entirety as transverse members.  
         [0012]    First lateral part  1  is connected to the transverse members via the connecting points  101 ,  102 ,  103  and  104 , second lateral part  6  via the corresponding connecting points  601  to  604 . It has proved advantageous so to design the parts at the connecting points  101  to  104 , or respectively  601  to  604 , so that transverse members and lateral parts are pushed into one another and then welded. This simplifies the assembly of the door-frame. The parts do not have to be fixed separately for welding. Generally, one jig is sufficient for adjusting the required door-frame mass, in which the welding process can also then take place.  
         [0013]    Various functional parts are integrated into first lateral part  1 . Reference numeral  9  designates the right-hand window guide rail. The left-hand window guide rail is located in lateral part  6  and is designated by the reference numeral  19 . These two guides are integrated as one piece into the corresponding lateral part. The mobile window, reference numeral  18  in FIG. 2, shown in the closed state, can be moved between an open position, in which the upper edge of the window-pane  18  facing window-frame part  5  is located at the height of the sill  4  or only slightly protruding beyond same (not drawn), and a closed position, as is shown in FIG. 2.  
         [0014]    Reference numerals  8  and  10  designate two door-hinge parts of the door-frame which are integrated as one piece into lateral part  1 . The corresponding counterparts, into which parts  8  and  10  are introduced so as to be mobile in a manner known to the person skilled in the art, are located in the door apertures of the vehicle bodywork (not drawn) and complete the door-hinges.  
         [0015]    Reference numeral  11  designates the retaining plate for mounting the exterior mirror. The retaining plate  11  is also an integral constituent part of first lateral part  1 .  
         [0016]    In second lateral part  6 , reference numeral  12  designates a depression into which the door-lock can be introduced and secured. Reference numeral  13  designates the mounting for the door-handle, which mounting is integrated into second lateral part  6  as one piece. Door-lock and door-handle are both not described in greater detail since they are not the subject matter of this invention.  
         [0017]    In the lower regions of right-hand lateral part  1  and left-hand lateral part  6 , reference numerals  20  and  21  designate reinforcing elements which brace the door-frame against the effect of shearing forces. These parts are also integrated into the lateral parts as one piece.  
         [0018]    In first reinforcing element  20 , the numeral  7  designates the receiver for a driving motor  14  for the mobile window-pane  18 . In second reinforcing element  21  is located the receiver or lug  22  for a deflection roller  151  for the window-lifter mechanism.  
         [0019]    The window-lifter mechanism is represented in FIG. 2. This is a cable window-lifter known per se and having a circumferential cable  16  with first, second and third deflection rollers  151 ,  152  and  153  respectively. First, second and third deflection rollers  151 ,  152  and  153  are rotatably secured respectively on lugs  22 ,  23  and  24 . These lugs  21 ,  22  and  23  are again integrated as one piece into first lateral part  1  and second lateral part  6 . To this cable are secured mountings  171  and  172  into which the window-pane  18  is inserted. With the aid of the driving motor  14 , the cable can be moved in a clockwise or anti-clockwise direction. By this means, the window-pane  18  is moved in the window guides  9  and  19  between an open position and a closed position. FIG. 2 reproduces the closed position of the windowpane  18 .  
         [0020]    First lateral part  1  and second lateral part  6  are produced as die-cast parts from a light metal alloy. A suitable light metal alloy has proved to be the alloy Magsimal-59 (AlMg5Si2Mn) produced by the company Aluminium Rheinfelden GmbH. Other alloys from the light metal group, such as those based on magnesium for example, are also conceivable.  
         [0021]    The transverse members  2  to  5  can be formed as extruded sections from material which is compatible with the alloy of the first lateral part  1  and the second lateral part  6  in respect of electrochemical compatibility (corrosion). These can also be plastics materials with appropriate rigidity and tenacity.  
         [0022]    Constructing the first lateral part  1  and the second lateral part  6  as die-cast parts permits high integration of functional elements as described above. This makes possible the small number of individual parts which leads to the advantages by comparison with construction according to prior art.