Abstract:
A cable bushing, in particular for a motor vehicle, for routing a cable harness having a plurality of electrical lines through a wall opening in a sealed manner. The cable bushing includes a dimensionally stable housing for insertion into the wall opening. The housing encloses a sealing member that is made of an elastic sealing material. The sealing member includes receiving devices or channels for individually routing the electrical lines in an axial direction. The cable bushing further has a pressure-providing element that exerts a compressive force on the sealing member, such that the sealing member encloses the electrical lines individually in a sealed manner and the sealing member is pressed radially against the housing to achieve a high level of impermeability to longitudinal water penetration. Additionally, pins may be provided to produce additional radial compressive forces.

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The invention relates to a cable bushing, in particular for a motor vehicle, for routing a cable harness having a plurality of electrical lines through a wall opening in a sealed manner. 
     DE 35 44 785 A1 discloses a sealing system that is suitable for a wall bushing for lines. The sealing system comprises a receiving body that is embodied from an elastic material that is compressed by two shell segments that in the fitted state act as a tensioning frame in order to achieve a moisture-tight contact of the receiving body against the lines. The receiving body comprises a dimensionally stable elastic block of rubber or a material similar to rubber. Through-going holes are provided in this block for the lines. Slits lead from the through-going holes to the exterior face of the receiving body. As a consequence, the receiving body can be opened slightly in order to receive the lines. As the shell segments that enclose the receiving body are placed in position, the receiving body is compressed so that all the gaps in the receiving body are closed. 
     DE 697 14 720 T2 discloses a seal for an aperture closure, in which a sealing element is arranged between pressure plates and the lines are individually routed through the pressure plates and the sealing element. 
     BRIEF SUMMARY OF THE INVENTION 
     The object of the invention is to provide a cable bushing that is improved with respect to its impermeability to longitudinal water penetration. 
     The object is achieved in accordance with the invention by means of a cable bushing, in particular for a motor vehicle, for the sealed routing of a cable harness having a plurality of electrical lines through a wall opening, said cable bushing comprising a dimensionally stable housing for inserting into the wall opening, which housing encloses a sealing element that is embodied as a pre-manufactured unit from an elastic sealing material, wherein receiving devices are provided in the sealing element for individually routing the electrical lines in an axial direction. Furthermore, a pressure-providing element is provided that exerts a compressive force on the sealing element in such a manner that the sealing material expands in the radial direction in a perpendicular manner with respect to the axial direction, in other words said sealing material is displaced radially outwards. As a consequence, it is achieved that the electrical lines are individually enclosed in a sealed manner by the sealing material and simultaneously the sealing element is preferably pressed in a radial manner against the housing. 
     In addition, the pressure-providing element comprises pins that protrude into the holes in the sealing element and namely in such a manner that a radial compressive force is exerted by way of said pins on the sealing material of the sealing element in the region of the holes and said force at least contributes to the sealing element being pressed in a radial manner against the housing. 
     For this purpose, the pins are preferably oversized with respect to the holes, in other words they comprise a larger diameter, as a consequence of which it is ensured that the pins are sealed in the sealing element. 
     The sealing element is, for example, axially fixed by means of the pins of the pressure-providing element, in particular the two parts of the sealing element can be mutually connected by way of the pins. 
     In addition to providing the function of radial expansion, the pins are also used for the precise (rotational) positioning of the pressure-providing elements with respect to the sealing element and said pins have advantages during the assembly process. 
     In accordance with a first preferred variant, the pins extend in the axial direction. In particular, two pressure plates are provided as pressure-providing elements that enclose between themselves the sealing element. Each pressure plate preferably comprises pins that protrude into the sealing element, in particular the pins of the opposite-lying pressure plates align with one another. The pins extend in each case only a part way into the sealing element. It is preferred that the pressure plates are not mutually connected. 
     In accordance with a second variant, the pins extend in a plane that is perpendicular with respect to the axial direction. The pressure-providing elements are expediently embodied as clamps that extend around the periphery of the pressure-providing element in such a manner that a plurality of pins are inserted into the pressure-providing element from several sides. This embodiment can be used alternatively or in addition to the pressure plates that exert a pressure on the pressure-providing element at the end face. 
     In accordance with a preferred embodiment variant, the housing comprises a peripheral surface that is provided with openings for the pins and the clamps lie outside the housing against the peripheral surface. As a consequence of the fact that the clamps, i.e. that the pressure-providing element is arranged outside the housing, the radial expansion of the sealing element is only limited by the housing, so that a good sealing arrangement is provided between the sealing element and the housing. As a consequence, it is also not necessary to seal the clamp with respect to the housing. 
     The cable bushing is conventionally mounted in the wall opening in a sealed manner by way of the housing. The housing comprises a mounting flange having a contact surface for contacting an edge of the opening and a circumferential seal that is in particular an O-ring for sealing the housing with respect to the wall opening. The dimensionally stable housing that is usually embodied as a dimensionally stable, synthetic material injection molded part is not only used for sealing the cable bushing with respect to the wall opening. On the contrary, it is also used to support the pressure-providing element, wherein the housing forms in particular a counter bearing so that the pressure-providing element can exert its compressive force on the prefabricated in particular cylindrical sealing element that is embodied from the resilient sealing material. The compressive force causes the sealing material of the sealing element to expand, so that the sealing element is pressed in the radial direction against the housing and in addition the sealing material encloses the electrical lines individually in a sealed manner. The cable harness is sealed in a manner that is based on the elastic sealing material expanding in a defined manner by means of which expansion not only are the electrical lines reliably sealed but water is also prevented from penetrating the contact region between the sealing element and the housing. Consequently, it is sufficient in the case of a cable bushing that is embodied in this manner merely to insert the cable busing into the wall opening and to seal said cable bushing with respect to the wall opening by way of the O-ring. 
     The cable bushing is therefore a prefabricated component that, together with the enclosed cables, forms in particular a pre-assembled cable set in which, for example, male connectors are attached at the end face to the lines. The individual components of the cable bushing, such as the sealing element, the pressure-providing element, the housing, are likewise prefabricated, separate individual components that are in particular mutually connected in a releasable manner, so that it is possible to repair or replace defective components or lines. It is therefore not necessary to pour a sealing mass into the housing in order to create the sealing element. The sealing material of the sealing element is overall preferably rubbery-elastic and is, for example, expanded rubber, a (thermoplastic) elastomer or a (silicone) rubber. 
     In order to be able to insert the electrical lines in a particularly simple manner individually into the receiving devices, the sealing element comprises preferably a separating site that extends over the entire length of the sealing element in such a manner that the individual electrical lines can be introduced into the sealing element by way of the separating site in a perpendicular manner with respect to the axial direction, in other words laterally and at least almost in the radial direction. In the case of this embodiment of the sealing element, it is not necessary to push the individual electrical lines through, but rather the lines are inserted into the receiving devices by way of the at least one separating site that extends between the two end faces of the sealing element. The electrical lines are thus introduced in a perpendicular manner, in other words laterally with respect to the axial direction and not in the axial direction as is the case when pushing through the electrical lines. In the possible event of components of the cable bushing becoming defective, said defective components can be dismantled in a non-destructive manner for repair purposes. 
     In accordance with a preferred embodiment, the pressure-providing element comprises two opposite-lying parts that are mutually connected in particular in a form-locking manner. It is ensured by means of the two opposite-lying parts of the pressure-providing element that the compressive force is exerted on the sealing element from at least two opposite directions. The pressure-providing element acts, for example, on the two end faces of the sealing element. Alternatively, the two parts of the pressure-providing element extend around the periphery of the sealing element. The parts of the pressure-providing element are preferably mutually connected in a form-locking and releasable manner, for example by way of a latching connection or snap-in connection. If it is necessary to dismantle the cable bushing, the pressure-providing element can consequently be disassembled in a rapid manner. 
     A plurality of separating sites is provided with a view to introducing the electrical lines into the receiving devices in a particularly simple manner; said separating sites are embodied as slits around the periphery of the sealing element and extend therefrom as far as the receiving devices. The slits are preferably merely embodied as cuts that are not open across the width of the slit, so that the edge faces of the slits lie directly one against the other. The electrical lines are pushed through the slits into the receiving devices from outside the sealing element. A good sealing arrangement is achieved around the slits by virtue of the fact that the slits preferably extend outwards in an inclined manner in a radially outwards direction and are in particular curved. As a consequence, the slits are reliably closed in a sealed manner as soon as a resulting radial force is exerted by way of the pressure-providing element, which radial force causes the sealing material to expand in the radial direction. 
     In accordance with a preferred variant, the pressure-providing element comprises two pressure-providing plates that lie at the end face against the sealing element. The pressure-providing plates exert at the end face a compressive force over a large surface area on the pressure-providing element, as a consequence of which the pressure-providing element expands in the radial direction. The process of generating a radial force component is supported by virtue of the fact that the contact surfaces of the sealing element and of the pressure-providing plates are embodied in a suitable manner. It is preferred that the pressure-providing element or the sealing element selectively or in combination comprise at least one region of a pressure-providing surface that is arranged in an inclined manner with respect to the axial direction in such a manner that as a consequence as the sealing element is compressed in the axial direction, a force component that acts in the radially outwards direction is produced. This is achieved structurally by virtue of the fact that the pressure-providing element for example is embodied in a convex manner. In addition thereto, the end faces of the sealing element are in particular embodied in a concave manner. 
     The surface pressure on the housing is increased by means of the radially expanded sealing element, by virtue of the fact that the sealing element is preferably profiled on the peripheral surface and the peripheral surface of the sealing element is reduced by means of this profiling. The profiling is, for example, embodied in the manner of one or more grooves that extend around the periphery of the sealing element. 
     In order that the pressure-providing plates exert pressure over a large as possible area on the pressure-providing element, the diameter of said pressure-providing plates is approximately as large as that of the sealing element. In order to be able to route the electrical lines that are routed through the sealing element also through the pressure-providing plates, the pressure-providing plates have in accordance with a preferred embodiment cutouts on the peripheral surface for the electrical lines, wherein the cutouts are embodied in particular for engaging behind the lines and for receiving said lines in a loss-proof manner and said cutouts are embodied, for example, in an L-shape. Once the electrical lines are inserted into the L-shaped cutouts, the pressure-providing plates are rotated slightly in particular in opposite directions, as a consequence of which the electrical lines are prevented from falling out. 
     In order that at least one of the pressure-providing plates can be supported in an axial manner on the housing, the housing comprises advantageously a stop, the diameter of which is smaller than the diameter of the pressure-providing plates. An axial counter bearing is likewise required for the opposite-lying pressure-providing plate, in particular if the two pressure-providing plates are not mutually connected, which counter bearing is attached to the housing, for example, after the pressure-providing plates have been assembled in the housing. For this purpose, an annular locking element is preferably provided. Said annular locking element can be connected to the housing in particular in a form-locking and releasable manner and as a consequence said annular locking element exerts an axial force on the pressure-providing element and/or on one of the pressure-providing plates. The connection in this case is in particular performed in the manner of a bayonet closure. Consequently, the locking element forms a second axial stop for one of the pressure-providing plates. The locking element is connected to the housing in a pre-defined position, as a consequence of which the relative position between the housing and the locking element is locked in the axial direction, so that a pre-defined contact pressing force acts in the axial direction on the contacting pressure-providing plate. The locking element is, for example, a locking element that has a narrowed neck, the diameter of which is smaller than the diameter of the pressure-providing plates. It is particularly advantageous when using the locking element that no additional components, for example screws, flat washers or threaded inserts are required. The locking element and the housing are connected in particular by way of a bayonet closure. Alternatively, snap-in hooks that latch into the housing are provided, for example, on the locking closure. The structural length of the snap-in hooks ensures that the sealing element is compressed by way of the sealing plates. 
     As an alternative to the slits, the separating site is formed in accordance with a further preferred variant by means of at least one separating plane and the sealing element comprises two or more sealing bodies that lie one against the other, wherein channels are provided at least in one sealing body and when the sealing element is in the assembled state, said channels form the receiving devices for the electrical lines. The channels that are arranged adjacent to one another extend in each case in the axial direction and lie in the separating plane. The channels therefore span said separating plane. Consequently, a plurality of electrical lines is routed each line adjacent to the other in the separating plane. The channels are radially open, so that the electrical lines are inserted into the channels without any great expenditure. The channels are only closed once two or more sealing bodies have been joined together, as a consequence of which the receiving devices are formed for the electrical lines. 
     The process of assembling the electrical lines is simplified by virtue of the fact that channels are advantageously embodied in such a manner as to receive the lines in a loss-proof manner and for this purpose said channels have in each case an undercut as seen in the cross-sectional view, so that the individual lines are encompassed partially by the sealing material. The lines that have already been inserted into the channels are thus held in their position in a loss-proof manner as long as other lines are pushed into the channels provided for said other lines. 
     The electrical lines are particularly efficiently sealed in the receiving devices along their length if the channels preferably become narrower in one region. A particularly high level of surface area pressure is applied to the site of the narrowed portion in order to seal the lines. The narrowed portion can also be embodied as a web that extends in a transverse manner with respect to the axial direction and fully blocks the channels. The elastic sealing material in the region of the web is pushed away as the lines are inserted into the channels. 
     In order to enhance the sealing arrangement between the sealing element and the housing, at least one bead-like thickening is embodied about the periphery of the sealing element, in particular in the region of the holes, and this thickened region is compressed when the cable bushing is in the assembled state. Said thickened region is also preferably provided in the case of the variant that comprises pressure-providing plates that are arranged at the end face. 
     The subordinate claims disclose embodiments that in some cases are themselves distinct and inventive, independent of the structural arrangement of the pins in accordance with the independent claim(s). The right is reserved to file a divisional application(s) relating to combinations of subordinate claims with the independent claim(s) without the feature of the structural arrangement of the pins. 
     Exemplary embodiments of the invention are explained in detail with reference to a drawing, in which: 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
         FIG. 1  shows an exploded view of a first embodiment variant of a cable bushing, 
         FIG. 2  shows an axial sectional view through the assembled cable bushing as shown in  FIG. 1 , 
         FIG. 3  shows a perspective view of a sealing element having grooves that are provided on the peripheral surface, 
         FIG. 4A-C  show a perspective sectional view of a pressure-providing plate in different variants ( FIG. 4A ,  4 B) and/or a sealing element ( FIG. 4C ) having inclined, in particular curved, end face regions of pressure-providing surfaces, 
         FIG. 5  shows a perspective view of a pressure-providing plate having a pin and a latch receiving device, 
         FIG. 6  shows an exploded view of a second embodiment variant of a cable bushing, 
         FIG. 7  shows a perspective view of the cable bushing as shown in  FIG. 6  in the assembled state, 
         FIG. 8  shows an axial sectional view through the cable bushing as shown in  FIG. 7 , and 
         FIG. 9  shows a schematic cross-sectional view through a sealing element of a cable bushing as shown in  FIG. 6  to  FIG. 8 . 
     
    
    
     DESCRIPTION OF THE INVENTION 
     Like reference numerals have the identical meaning in the different figures. 
       FIGS. 1 and 2  illustrate a first embodiment variant of a cable bushing  2  for routing a cable harness through a wall opening in a sealed manner. The cable harness comprises a plurality of electrical lines  4  of a cable harness  5  (cf.  FIG. 7 ) and for the sake of clarity only one of said electrical lines is illustrated in  FIGS. 1 and 2  and this one electrical line is identified by the reference numeral  4 . A protective cap  7  is provided in order to protect the electrical lines  4  outside the cable bushing  2 . 
     The cable bushing  2  comprises a dimensionally stable housing  6  for inserting into the wall opening. An  0 -ring  8  is provided in order to seal the housing  6  with respect to the wall opening. The housing  6  comprises a flange-like stop for contacting an edge of the wall opening. The cable bushing  2  is mounted on the wall by means of a screw  10  that is guided with the aid of a bush  12  through an eyelet  14  in the housing  6 . 
     The cable bushing  2  comprises in addition a sealing element  16  that in this exemplary embodiment is a one-piece, solid, cylindrical body embodied from an elastic sealing material, for example rubber. A plurality of slits  18  that extend in the axial direction A are embodied around the periphery of the sealing element  16  and said slits extend in the axial direction A in each case as far as a cylindrical receiving device  20  for individually routing the electrical lines  4 . The receiving devices  20  form accordingly a concentric circle not far from the peripheral surface of the sealing element  16 . The slits  18  as viewed in the cross-section are curved. The electrical lines  4  are pushed in by way of the slits  18  in a perpendicular manner with respect to the axial direction A as far as the receiving devices  20 . 
     A pressure plate  22  lies in each case against each of the two end faces of the sealing element  16 , wherein the pressure plates  22  are part of a two-piece pressure-providing element  24  with the aid of which a compressive force is exerted on the sealing element  16 . In the illustrated exemplary embodiment, the compressive force is exerted on the pressure-providing element  24  by means of a locking element  26  that is fixedly connected by way of a bayonet closure to the housing  6 . The locking element  26  and the pressure-providing plates  22  are firm and dimensionally stable components. 
     The pressure-providing plates  22  comprise around their periphery a plurality of cutouts  27  through which the electrical lines are routed. The number of cutouts corresponds to the number of receiving devices  20  in the sealing element  16 . The cutouts  27  are preferably embodied in an L-shape as viewed in the cross-section, so that the electrical lines  4  are prevented from falling out during the assembly process (cf.  FIG. 4A ,  4 B). For this purpose, the pressure-providing plates  22  are rotated with respect to each other. 
     The pressure-providing plates  22  preferably comprise pins  42  as is illustrated by way of example in  FIG. 5 . In particular, each pressure-providing plate  22  comprises a plurality of pins, for example two, three or more pins. Said pins penetrate preferably on each side into in each case a common hole  41  (cf.  FIG. 3 ) of the sealing element  16 . 
     The diameter of the pins  42  is greater than that of the allocated hole  41 , so that the sealing material is urged in the radial direction and as a consequence the level of impermeability to longitudinal water penetration is improved. 
     In order to increase the surface pressure of the sealing element  18  with respect to the housing  6 , the sealing element  16  can comprise around its periphery a profiling in the manner of one or more grooves  29  (cf.  FIG. 3 ). 
     As shown in  FIG. 1 , the end faces of the sealing element  16  are planar in a transverse plane that is transverse with respect to the axial direction A. The faces of the pressure-providing plates  22  that lie against the sealing element  16  are also embodied in a planar manner. It is possible, however, to generate radial force components of the compressive force on the sealing element  16  by virtue of the fact that a region  32  of a pressure-providing surface of the pressure-providing plates  22  or the end face of the sealing element  16  is inclined at an angle with respect to the axial direction A, for example they are embodied in a convex manner. Examples of this are illustrated in  FIGS. 4A ,  4 B,  4 C. If the region  32  of a pressure providing surface of the pressure-providing plates  22  is convex, the end faces of the sealing element  16  can in addition be concave. The convex region  32  of the pressure-providing surface is, for example, embodied in the manner of a central elevation in the end faces, said region can, however, also extend in an annular manner on the end face. 
     The locking element  26  comprises a narrowed neck  28 , the diameter of which is smaller than that of the pressure-providing surface plates  22 . The neck  28  forms an axial stop for one of the pressure plates  22 . A further stop  30  is embodied in the housing  6  for the second pressure-providing plate  22 , so that the position of the second of a pressure-providing surface plate  22  is fixed in the housing  6 . The diameter of the stop  30  is smaller than a diameter of the pressure plates  22 . 
     An axial force is generated by virtue of connecting the locking element  26  to the housing  6  since the locking element  26  presses on the pressure-providing plate  22  that is lying thereon. This compressive force is introduced into the sealing element  16  by way of the pressure plates  22 . This compressive force causes the sealing material of the sealing element  16  to expand radially so that the sealing element is pressed against the housing  6  and in addition the individual electrical lines that are routed through the receiving devices  20  in the sealing element  16  are enclosed in a sealed manner by the sealing material. The magnitude of the compressive force is defined by the position of the annular locking element  26  with respect to the housing  6 . 
     As an alternative to the bayonet closure, the locking element  26  can be connected to the housing  6  by way of snap-in hooks that latch in the housing  6 . The compressive force depends in particular on the length of the snap-in hook. 
     The pressure-providing plates  22  comprise in each case—as illustrated in FIG.  5 —preferably axially extending pins  42  that are guided through axial holes  41  in the sealing element  16  (cf.  FIG. 3 ). For example, only one of the pressure-providing plates  22  comprises axial pins that are approximately as long as the width of the sealing element  16  in the axial direction A, and the other pressure-providing plate comprises receiving devices, for example latch receiving devices  43 , for the end of the pins. This embodiment is also used in addition to compressing the sealing element  16  as an aid in the assembly process. In the case of the variant illustrated in  FIG. 5 , each of the pressure-providing plates  22  comprises a pin  42  and a latch receiving device  43 . 
     The second embodiment variant of the cable bushing  2  as shown in  FIGS. 6 to 8  differs from the first embodiment variant by virtue of the fact that the pressure-providing element  24  comprises two clamps  34  that are arranged around the sealing element  16 . In addition, the sealing element  16  is divided into two parallel separating planes, so that the sealing element  16  comprises three sealing bodies  36   a ,  36   b  and  36   c . Channels  38  are embodied in each of the sealing bodies  36   a ,  36   b ,  36   c , which channels extend in the axial direction A over the entire length of the sealing bodies  36   a ,  36   b ,  36   c . The channels  38  are open in the radial direction, so that the electrical lines  4  can be inserted into said channels. The channels  38  on a central sealing body  36   b  comprise in addition undercuts  39  that are illustrated in  FIG. 9 . When the electrical lines  4  are inserted into the channels  38 , said electrical lines are engaged from behind by the sealing material through the undercuts  39 . As a consequence, the lines  4  that are routed along the central sealing body  36   b  and in particular the lines  4  on the lower face of the central sealing body  36   b  are prevented from falling out during the process of assembling the cable bushing  2 . 
     The two outer sealing bodies  36   a ,  36   c  comprise in one region a narrowed portion  40  of the channels  38  by means of which the electrical lines  4  are axially fixed in the assembled state. 
     As the two outer sealing bodies  36   a ,  36   c  are placed on the central sealing body  36   b , the sealing material encloses the lines  4  individually in the receiving devices  20  that are embodied by means of the channels  38  on the central sealing body  36   b  and by means of the corresponding channels  38  on the outer sealing bodies  36   a ,  36   c  inside the sealing element  16 . As the sealing body  16  comprises two part planes, the lines  4  of the cable harness  5  are divided into two planes that extend in parallel with respect to each other. In the case of a sealing element  16  that is assembled from more than three sealing bodies  36   a ,  36   b ,  36   c , the number of planes of lines  4  is correspondingly greater. 
     In the second exemplary embodiment, pins  42  that protrude inwards from the clamps  34  and extend in a perpendicular manner with respect to the axial direction A are used to expand the sealing material of the sealing element  16 . Holes  44  for the pins  42  are provided in the sealing bodies  36   a ,  36   b ,  36   c , wherein the pins  42  are oversized with respect to the holes  44 , so that the pins  42  exert a compressive force on the sealing element  16  if said pins are inserted into the holes  44 . The sealing element  16  can expand both in the axial direction and in the radial direction by means of this compressive force, so that said sealing element is pressed against the housing  6 . 
     The two clamps  34  of the pressure-providing element  24  are not mounted directly on the sealing element  16  but rather they lie against a peripheral surface  46  of the housing  6 . The peripheral surface  46  of the housing  6  is provided for this purpose with openings  48  for the pins  42 . The clamps  34  are releasably mutually connected to embody the pressure-providing element  24 . The connection is in particular form-locking and is achieved by way of a latching protrusion  52  that latches into a latch receiving device  54  of the respective other clamp  34 . 
     With a view to achieving a particularly good sealing arrangement in the radial direction between the sealing element  16  and the housing  6 , the sealing element  16  comprises a plurality of bead-like thickened regions  50  around its periphery. One of these thickened regions  50  is located in the region of the holes  44 . If the sealing element  16  is enclosed by the housing  6  and the pins  42  are inserted into the holes  44 , the sealing element  16  lies in the region of the thickened regions  50  in a particularly sealed manner on the housing  6 . 
     A cable bushing  2  is characterized in the two described embodiment variants by the fact that the cable bushing  2  is sealed in a particularly efficient manner by virtue of the fact that the elastic sealing element  16  is expanded in a radial direction and as a result is pressed against the housing  6 . The difference between the two embodiment variants resides essentially in the fact that in the case of the first variant the pressure-providing element  24 , by means of which the compressive force is introduced into the sealing element  16 , acts in an axial direction on the end faces of the sealing element  16  and in the case of the second embodiment variant the compressive force is introduced into the inside of the sealing element  16  by way of the pins  42 . Due to the pressure-providing element  24  being arranged in a different manner with respect to the sealing element  16 , the sealing element  16  is also embodied in a different manner in the two embodiment variants. In the first embodiment variant, said sealing element comprises on its periphery axially extending separating sites that are embodied as slits  18  in order to provide the receiving devices  20  for the lines  4 . In the second embodiment variant, the separating sites are embodied by means of two separating planes, so that the sealing element  16  is embodied in three parts. 
     In the case of the two embodiment variants, the lines  4  are, however, inserted in a simple manner into the receiving devices  20  in a perpendicular manner with respect to the axial direction A. In addition, the cable bushings  2  can be dismantled in a rapid and simple manner in the event of a malfunction. 
     LIST OF REFERENCE NUMERALS 
     
         
           2  Cable bushing 
           4  Electrical line 
           5  Cable harness 
           6  Housing 
           7  Protective cap 
           8  O-ring 
           10  Screw 
           12  Bush 
           14  Eyelet 
           16  Sealing element 
           18  Slit 
           20  Receiving device 
           22  Pressure-providing plate 
           24  Pressure-providing element 
           26  Locking element 
           27  Cutouts 
           28  Neck 
           29  Grooves 
           30  Stop 
           32  Region of a pressure-providing surface 
           34  Clamp 
           36   a,b,c  Sealing body 
           38  Channel 
           39  Undercut 
           40  Narrowed portion 
           41  Hole 
           42  Pin 
           43  Latch receiving device 
           44  Hole 
           46  Peripheral surface 
           48  Opening 
           50  Thickened region 
           52  Latching protrusion 
           54  Latching receiving devices 
         A Axial direction