Patent Publication Number: US-11396769-B2

Title: Drive assembly for a window lifter having a stop ring for a cable drum

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the U.S. National Phase of PCT Application No. PCT/EP2017/072273, filed on Sep. 5, 2017, which claims priority to German Patent Application No. 10 2016 216 877.0, filed on Sep. 6, 2016, the disclosures of which are incorporated in their entirety by reference herein. 
     TECHNICAL FIELD 
     The disclosure relates to a drive device for an adjustment installation for adjusting a vehicle part, in particular a power window actuator. 
     BACKGROUND 
     Vehicles may include one or more drive devices to adjust a vehicle part. A drive device of this type may include a carrier element having an opening and a cable drum which by way of a portion is inserted into the opening of the carrier element in such a manner that the portion at least partially extends through the opening. A cable exit housing is disposed on a first side of the carrier element, said cable exit housing having a bearing element which on the first side of the carrier element mounts the cable drum so as to be rotatable about a rotation axis. 
     A drive device of this type can in particular be a component part of a power window installation and can thus serve for adjusting a window glass. However, such a drive device can also serve for adjusting another adjustment element, for example a sliding roof or the like, in a vehicle. 
     In the case of a power window actuator, one or a plurality of guide rails on which one entrainment element that is coupled to a window glass is in each case guided can be disposed on an apparatus carrier of a door module, for example. The entrainment element is coupled to the drive device by way of a flexurally limp traction cable which is conceived for transmitting (exclusively) tensile forces, wherein the traction cable is disposed on the cable drum in such a manner that the traction cable, in a rotating movement of the cable drum, by way of one end is wound onto the cable drum and by way of another end is unwound from the cable drum. A displacement of a cable loop formed by the traction cable thus takes place and correspondingly, a movement of the entrainment element along the respectively assigned guide rail. The window glass, driven by the drive device, can thus be adjusted so as to release or close a window opening on a door on the side of a vehicle, for example. 
     SUMMARY 
     It is an object underlying the proposed solution to make available a drive device which is particularly simple to assemble and when in operation can have a favorable operational behavior. 
     This object is achieved by a subject matter having features as described herein. 
     Accordingly, at least one bearing element which projects radially to the rotation axis from the portion is disposed on the portion of the cable drum, said bearing element engaging radially across a counter bearing on a periphery of the carrier element surrounding the opening of the carrier element in such a manner that the counter bearing blocks a movement of the cable drum through the opening of the carrier element. 
     The cable drum by way of a portion engages through the opening of the carrier element and by way of the portion at least partially protrudes through the opening of the carrier element. The cable drum by way of a body carrying a cable channel, herein comes to lie on the first side of the carrier element and is encompassed by the cable exit housing such that the cable drum is held on the carrier element by way of the cable exit housing. 
     In order for the cable drum to be assembled on the carrier element the cable drum, conjointly with the cable exit housing, is attached to the carrier element. A pre-assembled unit which can then be completed by attaching a drive housing from the other side of the carrier element can thus be achieved by connecting the cable exit housing to the carrier element, without particular precautions having to be taken for the cable drum to be held in position on the first side of the carrier element. In particular, the cable drum after being attached to the carrier element cannot slip through the opening in the carrier element, such that the assembly of the cable drum on the carrier element is simple, and the completion by way of a drive housing can also be performed in a simple manner from the other side. 
     The counter bearing on the carrier element may be formed by a bearing ring that surrounds the opening of the carrier element. The bearing ring herein can project in a radially inward manner from a circumferential periphery, for example in the form of a bead circumferentially surrounding the opening, and thus achieve a bearing for the at least one bearing element on the portion of the cable drum. The diameter of the bearing ring is smaller than the diameter of a circle enveloping the bearing elements such that the bearing elements prevent the cable drum from slipping through the opening of the carrier element. 
     The cable drum may have a plurality of bearing elements that are mutually spaced apart circumferentially on the portion. The bearing elements herein can be disposed so as to be mutually distributed in a uniform manner on the portion. 
     In one advantageous design embodiment the cable exit housing is connected in a positive-locking manner to the carrier element by way of latch-fit connection, and in this way, at least in a pre-assembly position after attaching the cable exit housing to the carrier element but before completing the drive device by way of a drive housing for receiving a motor unit, is held on the carrier element. The cable exit housing is thus already secured on the carrier element in the pre-assembly position and cannot fall off the carrier element after being attached to the carrier element. The cable drum is also held on the carrier element by way of the cable exit housing such that a pre-assembled unit for the further assembly is achieved. 
     In the operation of the drive device, torques can act on the cable exit housing by way of the cable drum that is mounted on the bearing element of the cable exit housing. It is thus to be guaranteed that the cable exit housing in the operation of the drive device cannot rotatingly move in relation to the carrier element. An anti-rotation safeguard is thus to be provided between the cable exit housing and the carrier element. 
     To this end, the at least one housing portion by way of which the base of the cable exit housing is connected to the carrier element can be established in a rotationally fixed manner on the carrier element, for example. A positive-lock element which in the case of an assembled cable exit housing engages with a positive-lock opening on the respective other component (thus the carrier element or the base portion of the at least one housing portion) can thus be provided on a base portion of the at least one housing portion or the carrier element. An anti-rotation safeguard between the cable exit housing and the carrier element is thus provided by way of the engagement of the positive-lock element in the positive-lock opening. Torques can be absorbed in a favorable manner on account of the at least one housing portion being radially spaced apart from the rotation axis and thus acting radially outside the rotation axis, around which the cable drum is rotatable. 
     The cable exit housing by way of the at least one housing portion herein is axially supported on the carrier element and, by axially bracing the cable exit housing in relation to the drive housing, is also braced in relation to the carrier element. The tension force of the fastening element is supported on the carrier element by way of the at least one housing portion. 
     The latch-fit connection in the pre-assembly position can herein also be produced by way of the base portion on the at least one housing portion of the cable exit housing. It can thus be provided that each positive-lock element in the pre-assembly position is held so as to latch in the assigned positive-lock opening, for example by providing a latching cam on the positive-lock element or the positive-lock opening, and an assigned latching clearance on the respective other component. A latching, positive-lock connection which holds the cable exit housing on the carrier element already in the pre-assembled position is thus produced by attaching the cable exit housing by way of the base portions thereof on the carrier element, and by engaging the positive-lock elements in the positive-lock openings. 
     The drive device may include a drive wheel that is drivable by a motor unit, and a drive housing which is disposed on a second side, facing away from the first side, of the carrier element and which has a further, second bearing element for mounting the drive wheel so as to be rotatable about the rotation axis. The cable exit housing is thus attached to the first side of the carrier element and there mounts the cable drum. The drive housing is attached to the second, facing away, side of the carrier element and there mounts the drive wheel. 
     In operation, the drive wheel and the cable drum are connected to one another in a rotationally fixed manner and are conjointly rotated so as to transmit torques from the motor unit toward the cable drum and, on account thereof, to move an adjustment element. The rotationally fixed connection between the cable drum and the drive wheel herein can be produced, for example, by way of a mutual engagement, for example meshing, of positive-lock elements, to which end a toothing of the cable drum meshes with an assigned toothing of the drive wheel and, on account thereof, produces a rotationally fixed connection. The cable drum can have a ring gear having an internal toothing, for example, said ring gear being placed onto a connecting wheel by an external toothing, for example, of the drive wheel. The ring gear herein can configure the portion which extends through the opening of the carrier element and on which the at least one bearing element is formed, such that the cable drum by way of the portion implementing the ring gear extends through the opening to the drive wheel and on the second side of the carrier element which is assigned to the drive housing is coupled to the drive wheel. 
     In one design embodiment the cable exit housing and the drive housing are fastened to one another by way of a fastening element that acts between the bearing element of the cable exit housing and the bearing element of the drive housing. A very simple assembly results on account of the cable exit housing on the first side of the carrier element, and the drive housing on the other, second side of the carrier element, being fastened to one another and therefore being established on the carrier element by way of a (single) fastening element which acts between bearing elements. For the assembly, the cable exit housing, on the one hand, and the drive housing, on the other hand, can in particular be attached to the carrier element so as to thereafter connect the cable exit housing and the drive housing to one another, and may mutually brace in an axial manner said cable exit housing and said drive housing, by way of the fastening element, for example a screw element, such that the carrier element is jammed between the cable exit housing and the drive housing. 
     The fastening element herein can engage from one of the bearing elements into the other of the bearing elements and, on account thereof, connect the bearing elements to one another. The cable exit housing, on the one hand, and the drive housing, on the other hand, are thus mutually established by way of the bearing elements. 
     For example, in the case of an arrangement according to the intended use on a vehicle, the cable drum is disposed on a door on the side of the vehicle, for example in a wet space, while the motor unit of the drive device lies in a dry space. The separation between the wet space and the dry space herein can be provided by the carrier element, for example an apparatus carrier, made of plastics, of a door module. Such a wet space/dry space separation can be maintained in a simple manner on account of the assembly of the cable exit housing on the one side of the carrier element and of the drive housing on the other side of the carrier element, and on account of the connection by way of a (single) central fastening element, without said wet space/dry space separation being compromised by fastening elements that engage from one side to the other. 
     The bearing element of the cable exit housing serves for mounting the cable drum and to this end can for example be configured as a cylindrical bearing dome which projects from a base of the cable exit housing. Moreover, the bearing element of the drive housing, which serves for mounting the drive wheel on the side of the carrier element that faces away from the cable drum, can be configured as a cylindrical bearing dome on the drive housing. The bearing domes are axially mutually braced by way of the fastening element, such that the cable exit housing, on the one hand, and the drive housing, on the other hand, are established on the carrier element by way of said bracing. 
     In one design embodiment the drive housing can have at least one fastening installation, for example a fastening bush having a positive-lock opening molded therein, which is radially spaced apart from the rotation axis. The drive housing by way of the fastening installation can also be established in a rotationally fixed manner on the carrier element, such that torques acting about the rotation axis can be absorbed and discharged and in particular cannot lead to the drive housing being rotated on the carrier element. 
     In order for the drive housing to be secured against rotation on the carrier element, a positive-lock element, which is disposed on the carrier element or the fastening installation of the drive housing, may engage in a positive-locking manner in a positive-lock opening which is formed on the respective other component (thus the fastening installation of the drive housing or the carrier element). Torques can be absorbed and discharged by way of the positive-lock engagement, such that the drive housing is established in a rotationally fixed manner on the carrier element. 
     A damping element which forms an elastic, damping intermediate layer between the positive-lock element and the wall of the positive-lock opening can be disposed herein on the positive-lock element. In this way, an acoustic decoupling between the drive housing and the carrier element can be achieved when in operation. 
     Both the cable exit housing as well as the drive housing can thus be secured in a positive-locking and rotationally fixed manner on the carrier element. This positive-lock fit is produced in a self-acting manner when the cable exit housing is attached to the first side of the carrier element and when the drive housing is attached to the second side of the carrier element, without special assembly steps being required to this end and further fastening elements, for example in the form of screw elements, having to be attached. The (axial) mutual establishment of the cable exit housing and the drive housing may be performed solely by way of the fastening element that acts centrally between the bearing elements of the cable exit housing and of the drive housing. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The concept on which the solution is based is to be explained in more detail hereunder by means of the exemplary embodiments illustrated in the figures. 
         FIG. 1A  shows an exploded view of an exemplary embodiment of a drive device. 
         FIG. 1B  shows the exploded view according to  FIG. 1A  from a different perspective. 
         FIG. 2  shows a view of a cable exit housing before being attached to a carrier element. 
         FIG. 3  shows another view of the cable exit housing before being attached to the carrier element. 
         FIG. 4A  shows a view of the cable exit housing on the carrier element. 
         FIG. 4B  shows a view enlarged in fragments of the assembly according to  FIG. 4A . 
         FIG. 5  shows a separate view of the cable exit housing seen from obliquely below. 
         FIG. 6  shows a plan view of the cable exit housing. 
         FIG. 7  shows a cross-sectional view along the line  7 - 7  according to  FIG. 6 . 
         FIG. 8  shows the cross-sectional view according to  FIG. 7 , with the cable exit housing attached to the carrier element. 
         FIG. 9  shows a cross-sectional view along the line  9 - 9  according to  FIG. 4A , before the bracing of the cable exit housing with a drive housing by way of a fastening element. 
         FIG. 10  shows a schematic view of an adjustment installation of a vehicle in the form of a power window actuator. 
     
    
    
     DETAILED DESCRIPTION 
     Such a drive device has generally to be designed so as to make available a torque of sufficient strength in order for the window glass to be adjusted. The drive device herein is to be able to have a small installation space, is to be easily assembled for example on an assigned carrier element, for example the apparatus carrier of a door module, and when in operation is to have a favorable operational behavior together with a low generation of noise, for example on a door module of a vehicle door. 
     In the case of a drive for an adjustment installation in a motor vehicle, known from DE 10 2004 044 863 A1, a cable drum is disposed on a bearing mandrel of a drive housing, wherein the drive housing by way of a fastening element in the form of a screw is connected to a carrier element in the form of an apparatus carrier. 
       FIGS. 1A, 1B to 9  show an exemplary embodiment of a drive device  1  which can be used, for example, as a drive in an adjustment installation for adjusting a window glass, for example of a side door of a vehicle. 
     Such an adjustment installation in the form of a power window actuator, illustrated in an exemplary manner in  FIG. 10 , has a pair of guide rails  11 , for example, on which one entrainment element  12  which is coupled to a window glass  13  is in each case adjustable. Each entrainment element  12  is coupled to a drive device  1  by way of a traction cable  10  which is configured for transmitting (exclusively) tensile forces, wherein the traction cable  10  configures a closed cable loop and to this end, by way of the ends of said traction cable  10 , is connected to a cable drum  3  (cf.  FIGS. 1A and 1B , for example) of the drive device  1 . The traction cable  10  extends from the drive device  1  around deflection rollers  110  on the lower ends of the guide rails  11  to the entrainment elements  12 , and from the entrainment elements  12  around deflection rollers  111  at the upper ends of the guide rails  11  back to the drive device  10 . 
     When in operation, a motor unit of the drive device  1  drives the cable drum  3  in such a manner that the traction cable  10  by way of one end is wound onto the cable drum  3 , and by way of the other end is unwound from the cable drum  3 . On account thereof, the cable loop formed by the traction cable  10  is displaced without any change in the freely extended cable length, this leading to the entrainment elements  12  being moved in the same direction on the guide rails  11  and the window glass  13 , on account thereof, being adjusted along the guide rails  11 . 
     The power window actuator in the case of the exemplary embodiment according to  FIG. 10  is disposed on an apparatus carrier  4  of a door module. The apparatus carrier  4  can, for example, be established on an internal door panel of a vehicle door and represents a pre-assembled unit which, in the pre-assembled state having the power window actuator disposed on the apparatus carrier  4 , can be assembled on the vehicle door. 
     The drive device  1  of the exemplary embodiment according to  FIGS. 1A, 1B to 9  is disposed on an area portion  40  of a carrier element  4  which is implemented, for example, by an apparatus carrier and has a cable exit housing  2  disposed on a first side of the carrier element  4 , and a drive housing  7  disposed on a second side of the carrier element  4 , said second side facing away from the first side. The cable exit housing  2  serves for mounting the cable drum  3  on the carrier element  4 , while the drive housing  7  encloses inter alia a drive wheel  6  which can be driven by way of a motor unit  8  and is connected to the cable drum  3  such that the cable drum  3  can be driven by rotating the drive wheel  6 . 
     The cable drum  3  on the first side of the carrier element  4 , when disposed according to the intended use on a vehicle door of a vehicle, for example, is disposed in a wet space of the vehicle door. By contrast, the drive housing  7  is located in the dry space of the vehicle door. The separation between the wet space and the dry space is established by way of the carrier element  4 , and the interface between the drive wheel  6  and the cable drum  3  is accordingly to be sealed in a moisture-proof manner such that no moisture make its way from the wet space to the dry space. 
     The cable exit housing  2  has a base  20 , a cylindrical bearing element  22  in the form of a bearing dome that projects centrally from the base  20 , and housing portions  21  in the form of housing webs which extend so as to be parallel to the cylindrical bearing element  22  and are radially spaced apart from the bearing element  22 . The cable drum  3  is rotatably mounted on the bearing element  22  and herein is enclosed by the cable exit housing  2  in such a manner that the cable drum  3  is held on the carrier element  4 . 
     The cable drum  3  has a body  30  and, on the circumferential shell face of the body  30 , has a cable channel  300  for receiving the traction cable  10 , said cable channel  300  being molded in the body  30 . The cable drum  3  by way of a ring gear  31  is inserted in an opening  41  of the carrier element  4  and is connected in a rotationally fixed manner to the drive wheel  6  such that a rotating movement of the drive wheel  6  leads to a rotating movement of the cable drum  3 . 
     The drive housing  7  by way of an interposed sealing element  5  is attached to the other, second side of the carrier element  4  and has a housing case  70  having a bearing element  72  in the form of a cylindrical bearing dome which is configured centrally in said housing case  70  and which engages through an opening  62  of the drive wheel  6  and which in this way rotatably mounts the drive wheel  6 . A worm housing  74  adjoins the housing case  70 , a drive worm  81  which is connected in a rotationally fixed manner to a drive shaft  800  of an electric motor  80  of the motor unit  8  lying in said worm housing  74  and by way of a worm toothing meshing with an external toothing  600  of a body  60  of the drive wheel  6 . The drive shaft  800 , at the end thereof that faces away from the electric motor  80 , by way of a bearing  82  is mounted in the worm housing  74 . The electric motor  80  herein lies in a motor case  73  of the drive housing  7 , said motor case  73  by way of a housing cover  75  being closed in relation to the outside. 
     The drive housing  7  moreover has an electronics housing  76  in which a circuit board  760  having control electronics disposed thereon is enclosed. The electronics housing  76  is closed in relation to the outside by way of a housing plate  761  having a plug connector  762  for the electrical connection of the electronics of the circuit board  760  disposed on said housing plate  761 . 
     The drive wheel  6 , so as to project axially from the body  60 , has a connecting wheel  61  having an external toothing  610  molded thereon, said connecting wheel  61  engaging with the ring gear  31  of the cable drum  3  in such a manner that an internal toothing  310  of the ring gear  31  (cf. FIG.  1 B, for example) connects in a meshing manner with the external toothing  610  of the connecting wheel  61 . The drive wheel  6  and the cable drum  3  are in this way connected in rotationally fixed manner to one another such that the cable drum  3  is rotatable on the carrier element  4  by driving the drive wheel  6 . 
     In order for the drive device  1  to be assembled, the cable exit housing  2  is attached to the carrier element  4 , on the one hand, and the drive housing  7  is attached to the carrier element  4 , on the other hand. The fastening to the carrier element  4  is in this instance performed in that a fastening element  9  in the form of a screw element is inserted into an engagement opening  721  on the lower side of the drive housing  7  in such a manner that the fastening element  9  extends through an opening  720  in the bearing element  72  of the drive housing  7  (cf.  FIG. 9 ) and engages centrally in an opening  221  within the bearing element  22  of the cable exit housing  2 . The cable exit housing  2  and the drive housing  7  by way of the fastening element  9  are mutually axially braced on the bearing elements  22 ,  72  and are thereon established on the carrier element  4 . 
     A thread for receiving the fastening element  9  can be molded within the opening  221  of the bearing element  22  of the cable exit housing  2 . However, it is also conceivable and possible for the fastening element  9  to be screwed into the opening  221  in a self-tapping manner. 
     For assembly, the cable exit housing  2  is attached to the first side of the carrier element  4  such that the cable exit housing  2  encloses the cable drum  3  and holds the latter on the carrier element  4  as is illustrated in  FIGS. 2A to 4A, 4B . The cable exit housing  2  herein, by way of the housing portions  21  thereof that are radially spaced apart from the bearing element  22 , by way of base portions  210  comes to bear on a contact ring  45  which circumferentially surrounds an opening  41  in the carrier element  4 . Axially projecting positive-lock elements  42  in the form of web-shaped pins are configured on the contact ring  45 , said positive-lock elements  42 , when attaching the cable exit housing  2  to the carrier element  4 , engaging with positive-lock openings  212  (cf.  FIG. 4B ) on the base portions  210  of the housing portions  21 , and in this way achieving an anti-rotation safeguard about the rotation axis D between the cable exit housing  2  and the carrier element  4 , said rotation axis D being defined by the bearing element  22 . 
     The web-shaped positive-lock elements  42 , when viewed along the circumferential direction about the bearing element, on the lateral edges thereof can extend in an oblique manner (at a minor angle) such that the housing portions  21  when plug-fitting the base portions  210  onto the positive-lock elements  42  are established on the positive-lock elements  42  so as to be free of play along the circumferential direction. 
     Latching clearances  420  (cf.  FIG. 1A , for example) in which latching elements  211  in the form of outwardly projecting latching cams on the housing portions  21  engage in the case of an attached cable exit housing  2  are provided on the internal side of the positive-lock elements  42 , as can be seen, for example, in  FIG. 6  to  FIG. 8 . The cable exit housing  2 , conjointly with the cable drum  3  enclosed therein, is held on the carrier element  4  in a pre-assembly position by way of said latching connection, even when the drive housing  7  is not yet braced in relation to the cable exit housing  2  by way of the fastening element  9 . The latching connection thus simplifies the assembly and prevents the cable exit housing  2  from falling off in the case of an as yet unassembled drive housing  7 . 
     The cable drum  3  in the pre-assembly position, by way of radially projecting bearing elements  32  on the upper periphery of the ring gear  31  (cf.  FIG. 1A , for example) comes to bear on a bearing ring  46  within the opening  41  of the carrier element  4  (cf.  FIG. 8 , for example), such that the cable drum  3  in the pre-assembly position cannot slip through the opening  41  and is held on the carrier element  4  by way of the cable exit housing  2 . 
     The bearing elements  32  serve in particular for securing the position of the cable drum  3  on the carrier element  4  in the pre-assembly position. Upon complete assembly of the drive device  1  the cable drum  3  is connected to the drive wheel  6  by way of the ring gear  31  and is axially established between the cable exit housing  2  and the drive housing  7 . 
     Axially extending securing elements  23  that project in a radially inward manner are disposed on the internal sides of the housing portions  21 , said securing elements  23  facing the cable channel  300  on the shell face of the body  30  and when in operation, sliding along said shell face. It is ensured by way of said securing elements  23  that the traction cable  10  received in the cable channel  300  cannot jump out of the cable channel  300 . 
     The drive housing  7  is attached to the other, second side of the carrier element  4  in such a manner that the motor case  73  comes to lie in a molding  44  in the area portion  40 , and the worm housing  74  comes to lie in a molding  440  in the area portion  40  that is adjacent to said worm housing  74  (cf.  FIGS. 1A, 1B and 2 ). Fastening installations  71  in the form of engagement bushes having positive-lock openings molded therein engage with positive-lock elements  43  in the form of pins projecting from the lower side of the carrier element  4  when the drive housing  7  is attached. On account of the positive-lock openings of the fastening installations  71 , exactly like the positive-lock elements  43  in the form of the pins on the carrier element  4 , being radially spaced apart from the rotation axis D defined by the bearing element  72  of the drive housing  7 , the drive housing on account of said positive-locking engagement is established in a rotationally fixed manner on the carrier element  4  such that an anti-rotation safeguard for the drive housing  7  is provided. 
     Engagement portions  51  are disposed on an annular seal  50  of the sealing element  5  on the positive-lock elements  43  of the carrier element  4 , such that the positive-locking engagement of the positive-lock elements  43  with the positive-lock openings on the fastening installations  71  is performed with the intervention of the engagement portions  51 . The serves for the acoustic decoupling. 
     A curved portion  52  which comes to lie in the region of the molding  45  for receiving the worm housing  74  is configured on the sealing element  5 . The curved portion  52  forms an intermediate layer between the worm housing  74  and the carrier element  4  such that an acoustic decoupling of the drive housing  7  from the carrier element  4  is also achieved thereon. 
     When the drive housing  7  has been attached to the carrier element  4  with the intervention of the sealing element  5 , the drive housing  7  by way of the fastening element  9  is braced in relation to the cable exit housing  2  such that the cable exit housing  2  and the drive housing  7  thereby are mutually established and established on the carrier element  4 . As is illustrated in  FIG. 9 , the fastening element  9  is inserted into the engagement opening  721  within the bearing element  72  of the drive housing  7  such that the fastening element  9  by way of a shank  90  engages through the opening  720  at the head of the bearing element  72  and engages in the opening  221  of the bearing element  22  of the cable exit housing  2 . A head  91  of the fastening element  9  herein comes to lie on the side of the opening  720  that faces away from the bearing element  22  such that the cable exit housing  2  is braced in relation to the drive housing  7  by screwing the fastening element  9  into the opening  221  within the bearing element  22 . 
     As can be seen from  FIGS. 2 and 6 , for example, the cable exit housing  2  on the base  20  thereof on the side that faces away from the carrier element  4  has structural elements  200 ,  201  in the form of reinforcement ribs which extend radially in relation to the rotation axis D defined by the bearing element  22 , or extend circumferentially about the rotation axis D, and reinforce the base  20 . Local recesses  202  for weakening the material on the structural elements  200  are achieved herein in the radially extending structural elements  200 , said recesses  202  being disposed along a ring about the rotation axis D and achieving a predetermined deforming line for the elastic deformation of the base  20 . 
     When the fastening element  9  is screwed into the bearing element  22  from the side of the drive housing  7 , the base  20  can thus be at least slightly deformed such that production-related tolerances can be equalized and the cable exit housing  2  by way of the base portions  210  on the housing portions  21  is established in a play-free manner on the carrier element  4 . 
     The bearing element  22  on an end that faces away from the base  20  moreover has a conical portion  220  in the form of a centering cone (cf.  FIGS. 8 and 9 ) which when bracing the cable exit housing  2  in relation to the drive housing  7  engages in a centering engagement, shaped in a complementary manner, on the bearing element  72  of the drive housing  7 , and in this way sets a centered position of the bearing element  22  of the cable exit housing  2  in relation to the bearing element  72  of the drive housing  7 . Both the conical portion  220  on the end of the bearing element  22  as well as the centering engagement  722  on the head of the bearing element  72 , are conically shaped and herein are mutually complementary, such that the bearing element  22  of the cable exit housing  2  in the event of an engagement is aligned so as to be centered in relation to the bearing element  72  of the drive housing  7 . 
     The bearing element  22  of the cable exit housing  2  and the bearing element  72  of the drive housing  7  herein define a common rotation axis D for the cable drum  3 , on the one hand, and for the drive wheel  6 , on the other hand, such that the cable drum  3  and the drive wheel  6  when in operation can rotate in a mutually coaxial and conjoint manner. 
     The concept on which the solution is based is not fundamentally limited to the exemplary embodiments set forth above but can fundamentally also be implemented in an entirely different manner. 
     A drive device of the type described is in particular not limited to the use in a power window actuator but can also serve for adjusting another adjustment element, for example a sliding roof or the like, in a vehicle. 
     The drive device can be assembled in a simple manner particularly while using a (single) axially braced fastening element. An assembly comprising few assembly steps which can be simple and cost-effective paired with a reliable establishment of the cable exit housing and of the drive housing on the carrier element results. 
     LIST OF REFERENCE SIGNS 
     
         
         
           
               1  Drive device 
               10  Cable 
               11  Guide rail 
               110 ,  111  Deflection 
               12  Entrainment element 
               13  Window glass 
               2  Cable exit housing 
               20  Base 
               200 ,  201  Structural element (reinforcement rib) 
               202  Recess (material weakening) 
               21  Housing portion 
               210  Base portion 
               211  Latching element 
               212  Positive-lock opening (slot opening) 
               22  Bearing element (bearing dome) 
               220  Centering cone 
               221  Opening 
               23  Safeguard 
               3  Cable drum 
               30  Body 
               300  Cable channel 
               31  Ring gear 
               310  Toothing 
               32  Bearing element 
               4  Carrier element (apparatus carrier) 
               40  Area portion 
               41  Opening 
               42  Positive-lock element 
               420  Latching clearance 
               43  Positive-lock element 
               44  Molding 
               440  Molding 
               45  Contact ring 
               46  Counter bearing (bearing ring) 
               5  Sealing element 
               50  Annular seal 
               51  Engagement portion 
               52  Curved portion 
               6  Drive wheel 
               60  Body 
               600  External toothing 
               61  Connecting wheel 
               610  Toothing 
               62  Opening 
               7  Drive housing 
               70  Housing case 
               71  Fastening installation (engagement bush) 
               72  Bearing element (bearing dome) 
               720  Opening 
               721  Engagement opening 
               722  Centering engagement 
               73  Motor case 
               74  Worm housing 
               75  Housing cover 
               76  Electronics housing 
               760  Circuit board 
               761  Housing plate 
               762  Plug connector 
               8  Motor unit 
               80  Electric motor 
               800  Drive shaft 
               81  Drive worm 
               82  Bearing 
               9  Fastening element 
               90  Shank 
               91  Head 
             D Rotation axis 
             X 1 , X 2 , X 3  Play