Patent Publication Number: US-10333247-B2

Title: Wire harness

Description:
FIELD OF THE INVENTION 
     The present invention relates to a wire harness comprising a cable having a shield conductor and a connector housing that houses an end of the cable. 
     BACKGROUND OF THE INVENTION 
     As a conventional wire harness, a wire harness described in Patent Literature 1 has been known. This wire harness comprises a plurality of cables, a pair of terminals connected to respective ends of the plurality of cables, and a housing that houses the ends of the respective cables together with the pair of terminals. 
     The cable comprises a central conductor connected to the terminal, a coating material comprising an insulator for coating the central conductor (insulating coating), a braid shield formed at an outer periphery of the coating material, and a sheath covering the braid shield. An end of the braid shield is exposed from the sheath and folded back, and it is swaged at the outside of the sheath by a ferrule. 
     The housing is constituted from first to fourth housing members, and the second housing member comprises resin, while the first, third, and fourth housing members comprise metal such as aluminum. The third and fourth housing members are formed in a tubular shape, and the ferrule is housed therein. Also, the third and fourth housing members are fitted into fit holes formed in the first housing member by press fitting. 
     In the second housing member, a connecting portion formed at one end in an extending direction of the cable in the housing is fitted into the first housing member. Also, the second housing member has a terminal holding portion at the other end opposite to the connecting portion, and a pair of terminals are held by this terminal holding portion. 
     PRIOR ART DOCUMENTS 
     Patent Literature 
     Patent Literature 1: JP-A 2014-154255 
     SUMMARY OF THE INVENTION 
     Problem to be Solved by the Invention 
     The wire harness may be subjected to a strong vibration continuously depending on its application use. When the wire harness configured as described above is mounted on e.g. a vehicle and is subjected to the vibration due to the running, if a distance between the terminal and a part of the cable swaged by the ferrule is long, the conductor and the coating material provided therebetween may oscillate, thereby may affect the durability of the cable. This may become a factor that can restrain the application use of the wire harness. 
     Accordingly, it is an object of the present invention to provide a wire harness which can suppress the vibration of a central conductor and a coating material between a swaging position of a shield conductor and a terminal. 
     Means for Solving the Problems 
     For solving the above problem, the present invention provides a wire harness, comprising: 
     a cable comprising a central conductor, a coating material that coats the central conductor, and a shield conductor that covers the coating material; 
     a terminal that is connected to the central conductor of the cable; 
     a connector housing that houses an end of the cable together with the terminal; 
     a ferrule, that is electrically connected to the shield conductor and comprises a tubular metal, into which the central conductor and the coating material inserted; and 
     a fixing member that fixes the ferrule to the connector housing, 
     wherein the ferrule comprises a swaging portion for swaging the shield conductor and a tightening portion for tightening the coating material, 
     wherein the tightening portion is located closer to the terminal than the swaging portion. 
     Effect of the Invention 
     According to the wire harness according to the present invention, it is possible to suppress the vibration of a central conductor and a coating material between a swaging position of a shield conductor and a terminal. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view showing a wire harness in an embodiment of the present invention; 
         FIG. 2  is a perspective view showing the wire harness together with a connector to which the wire harness is fitted; 
         FIG. 3  is a cross sectional view along A-A line in  FIG. 1 ; 
         FIG. 4  is a cross sectional view along B-B line in  FIG. 1 ; 
         FIG. 5A  is a side view showing a first ferrule together with a first cable; 
         FIG. 5B  is a cross sectional view in which the first ferrule and the first cable are cut along a central axis of the first ferrule; 
         FIG. 6  is a cross sectional view in which the first ferrule and a peripheral portion thereof installed in the connector are cut in a cross section perpendicular to the central axis of the first ferrule; and 
         FIG. 7  is a partially broken perspective view showing a part of an inner ring housed in the first ferrule. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENT 
     Embodiment 
       FIG. 1  is a perspective view showing a wire harness in an embodiment of the present invention. This wire harness  1  comprises three cables (first to third cables  21  to  23 ), and a connector  3  provided at ends of the three cables. In  FIG. 1 , only a portion in a longitudinal direction of three cables on a connector  3  side is shown.  FIG. 2  is a perspective view showing the wire harness  1  together with a connector  7  to which the wire harness  1  is fitted.  FIG. 3  is a cross sectional view along A-A line in  FIG. 1 .  FIG. 4  is a cross sectional view along B-B line in  FIG. 1 . 
     The wire harness  1  connects an electric motor for generating a driving force for running in a vehicle and a power-supply unit (inverter) which supplies an electric current to this electric motor. This electric motor is a three-phase AC motor and receives alternate currents at U-phase, V-phase and W-phase generated by ON-OFF state of a switching element in the power-supply unit, thereby produces the driving force. 
     Each of the first to third cables  21  to  23  is constructed similarly. In other words, each of the first to third cables  21  to  23  comprises a central conductor  201 , a coating material  202  covering the central conductor  201 , a shield conductor  203  covering the coating material  202 , and a sheath  204  as a jacket comprising an insulator covering the shield conductor  203 . 
     The central conductor  201  of the first cable  21 , the central conductor  201  of the second cable  22 , and the central conductor  201  of the third cable  23  supply the U-phase current, the V-phase current and the W-phase current to the electric motor, respectively. The central conductor  201  is formed by twisting a plurality of strands each of which comprises metal having good electrical conductivity such as copper or aluminum. A terminal  30  is connected to the end of each central conductor  201  of the first to third cables  21  to  23 , e.g., by welding. 
     The connector  3  comprises three terminals  30 , a connector housing  40  comprising electrically-conductive metal for housing the ends of the first to third cables  21  to  23  together with the three terminals  30 , first to third ferrules  51  to  53  and first and second insulators  41 ,  42  that are housed in the connector housing  40 , a pair of fixing members  61 ,  62  for fixing the first to third ferrules  51  to  53  to the connector housing  40 , and a fastening bolt  31  for fastening the connector  3  to a counterpart connector  7 . 
     The connector housing  40  is formed, e.g., of aluminum die-cast and has a box shape which is opened towards the counterpart connector  7 . The first and second insulators  41 ,  42  are made from resin having electrical insulation, and electrically isolate the terminals  30  from each other and between the terminals  30  and the connector housing  40 . The first insulator  41  is placed on a bottom surface  40   a  side of the connector housing  40 , and the second insulator  42  is placed on an opening side of the connector housing  40 . 
     The first insulator  41  is fixed to the connector housing  40  by a screw (not shown), and the second insulator  42  is fixed to the first insulator  41  by a screw  43 . Also, the second insulator  42  comprises a tabular plate portion  420  fixed to the first insulator  41  and three receiving portions  421  which maintain the terminal  30 , respectively. The three receiving portions  421  are stood along the terminal  30  from the plate portion  420  towards an opening side of the connector housing  40 . 
     The three cable insertion holes  401  are formed through the connector housing  40  for introducing the first to third cables  21  to  23 , respectively. A sealing ring  43  is placed between an outer peripheral surface of each sheath  204  of the first to third cables  21  to  23  and an inner surface of the cable insertion hole  401 , and the sealing ring  43  is prevented from dropping-off by a tail plate  44 . Also, an annular sealing member  45  for sealing a gap between a housing  70  of the counterpart connector  7  is placed at a peripheral portion of the opening of the connector housing  40 , and this sealing member  45  is prevented from dropping-off by a seal plate  46 . 
     The fastening bolt  31  functions as an axle-shape attaching member for attaching the connector housing  40  to the counterpart connector  7  as an object for attachment, and comprises a hexagonal head  311 , a cylindrical trunk  312  and a fastener  313  comprising a male screw as one piece. The head  311  is placed outside the connector housing  40 , and the trunk  312  penetrates through the connector housing  40  and the first and second insulators  41 ,  42 . 
     An annular groove  312   a  is formed at the trunk  312  of the fastening bolt  31  near an end on a head  311  side, and an O-ring  32  is placed in this annular groove  312   a . The O-ring  32  seals between an outer peripheral surface of the trunk  312  and an inner surface of a bolt insertion hole  402  formed through the connector housing  40 . Also, a tip end of the fastener  313  of the fastening bolt  31  is projected from the opening of the connector housing  40 . 
     The first ferrule  51  is provided to correspond to the first cable  21 , and the third ferrule  53  is provided to correspond to the third cable  23 . The second ferrule  52  is provided to correspond to the second cable  22  and is placed between the first ferrule  51  and the third ferrule  53 . The first to third ferrules  51  to  53  are formed to have a tubular shape and comprising electrically conductive metal. For this metal, metals having good electrical conductivity such as aluminum or brass can be preferably used. 
     The first to third cables  21  to  23  extend in parallel to each other inside the connector housing  40 , and the second cable  22  is placed between the first cable  21  and the third cable  23 . Also, the first to third cables  21  to  23  vary in length from the cable insertion hole  401  to the terminal  30 . 
     Specifically, a length of the central conductor  201  of the first cable  21  in the connector housing  40  is substantially equal to a length of the central conductor  201  of the third cable  23  in the connector housing  40  and a length of the central conductor  201  of the second cable  22  in the connector housing  40  is shorter than lengths of the first and third cables  21 ,  23  in the connector housing  40 . Here, the “length in the connector housing  40 ” refers to a length from an outside opening end of the cable insertion hole  401  outside the connector housing  40  to a tip end of the central conductor  201  connected to the terminal  30 . 
     Also, in response to differences in length of the first to third cables  21  to  23 , the length in the longitudinal direction (central axis direction) of the second ferrule  52  is shorter than the lengths of the first and third ferrules  51 ,  53  in the longitudinal direction (central axis direction). Therefore, a space is formed between the terminal  30  connected to the central conductor  201  of the first cable  21  and the terminal  30  connected to the central conductor  201  of the third cable  23 , and the fastening bolt  31  is placed in this space. That is, the fastening bolt  31  is placed between the terminal  30  connected to the central conductor  201  of the first cable  21  and the terminal  30  connected to the central conductor  201  of the third cable  23 . In other words, the fastening bolt  31  is placed on an extension line of the second cable  22  in the space that is formed by shortening the second cable  22  than the first and third cables  21 ,  23 . 
     The first to third ferrules  51  to  53  are electrically connected to the shield conductors  203  of the corresponding first to third cables  21  to  23 , respectively, and each of which has a tubular shape for introducing the central conductor  201  and the coating material  202 . The shield conductor  203  is exposed from the sheath  204  inside each of the first to third ferrules  51  to  53 , and this exposed end is turned down outside the sheath  204  and contacts with the inner surface of each of the first to third ferrules  51  to  53 . The shield conductor  203  is made of a braid shield in which a plurality of strands are knit to intersect each other to have a mesh shape. 
     The first to third ferrules  51  to  53  are electrically connected to the connector housing  40  by a pressing force from the pair of fixing members  61 ,  62 . More specifically, a receiving portion  403  is stood on a bottom surface  40   a  of the connector housing  40 , and the first to third ferrules  51  to  53  are pressed against this receiving portion  403 . Among the pair of fixing members  61 ,  62 , one fixing member  61  presses the first and second ferrules  51 ,  52  against the receiving portion  403  of the connector housing  40 , and the other fixing member  62  presses the second and third ferrules  52 ,  53  against the receiving portion  403  of the connector housing  40 . 
     A contact surface of the receiving portion  403  with each of the first to third ferrules  51  to  53  is formed into an arc shape along the outer peripheral surface of each of the first to third ferrules  51  to  53 . Thereby, the connector housing  40  is in surface contact with each of the first to third ferrules  51  to  53  at the receiving portion  403 . Similarly, a contact surface of the one fixing members  61  with each of the first and second ferrules  51  and a contact surface of the other fixing member  62  with each of the second and third ferrules  52 ,  53  are formed into an arc-shape along the outer peripheral surface of each of the first to third ferrules  51  to  53 . 
     Each of the pair of fixing members  61 ,  62  is fastened to the connector housing  40  by a screw  47 . The screw  47  comprises a male screw and engages threadedly with a threaded hole (not shown) formed at the receiving portion  403 . Even though there are manufacturing errors in outer diameter dimensions of the first to third ferrules  51  to  53 , the first and second ferrules  51 ,  52  are pressed against the receiving portion  403  by one fixing members  61  and the second and third ferrules  52 ,  53  are pressed against the receiving portion  403  by the other fixing member  62 , so that a tightening force of the screw  47  tightening the one fixing members  61  acts on the first and second ferrules  51 ,  52  substantially evenly, and a tightening force of the screw  47  tightening the other fixing member  62  acts on the second and third ferrules  52 ,  53  substantially evenly. 
     The counterpart connector  7  comprises a housing  70  comprising electrically conductive metal, a terminal holder  71  comprising electrically insulating resin and being fixed to the housing  70 , plural (three in the present application) terminals  72  held by the terminal holder  71 , two screws  73  for fixing the terminal holder  71  to the housing  70 . 
     The terminal holder  71  comprises a tabular plate portion  710  fixed to the housing  70  by screws  73 , and a plurality of projections  711  that project from the plate portion  710  to surround the terminals  72 . The plurality of projections  711  provides a touch protection structure to prevent a finger of the person from contacting the terminals  72  carelessly. Also, a female thread portion  701  with which the fastener  313  of the fastening bolt  31  engages threadedly is formed at the housing  70 . 
     In this embodiment, the terminal  72  of the counterpart connector  7  is a male terminal, and the terminal  30  on the connector  3  side of the wire harness  1  is a female terminal. However, this male-female relation may be reversed. When the connector  3  of the wire harness  1  fits into the counterpart connector  7 , the terminal  30  of the connector  3  contacts the terminal  72  of the counterpart connector  7 , so that these both terminals  72 ,  30  are electrically connected to each other. The counterpart connector  7  is fixed to a housing of the above-mentioned electric motor or the power-supply unit. When the fastener  313  of the fastening bolt  31  engages threadedly to the female thread portion  701 , the connector housing  40  is fixed to the counterpart connector  7 . 
     In this embodiment, a fitting direction between the connector  3  and the counterpart connector  7  is at right angles to an extension direction of the first to third cables  21  to  23  in the connector housing  40 . Thereby, the downsizing of the dimensions in the fitting direction of the connector housing  40  with the counterpart connector  7  is achieved. 
     Next, with reference to  FIGS. 5A, 5B, 6, and 7 , a swaging structure of the first and third cables  21 ,  23  by the first and third ferrules  51 ,  53  will be described below. It should be noted that the swaging structure of the third cable  23  by the third ferrule  53  is similar to the swaging structure of the first cable  21  by the first ferrule  51  so that the swaging structure by the first ferrule  51  will be described in detail for an example and the redundant explanation about the third ferrule  53  will be omitted. 
       FIG. 5A  is a side view showing the first ferrule  51  together with the first cable  21 .  FIG. 5B  is a cross sectional view in which the first ferrule  51  and the first cable  21  are cut along a central axis of the first ferrule  51 .  FIG. 6  is a cross sectional view in which the first ferrule  51  and a peripheral portion thereof installed in the connector  3  are cut in a cross section perpendicular to the central axis of the first ferrule  51 .  FIG. 7  is a partially broken perspective view showing a part of an inner ring  50  as an inner tubular member housed in the first ferrule  51 . 
     The first ferrule  1 S comprises a swaging portion for swaging the shield conductor  203 , and a tightening portion for tightening the coating material  202  coating the central conductor  201 . In this embodiment, the tightening portion to tighten the coating material  202  is formed by swaging. The swaging portion for swaging the shield conductor  203  is referred to as a first swaging portion  511 , and the tightening portion for tightening the coating material  202  is referred to as a second swaging portion  512 . Namely, the first ferrule  51  comprises the first swaging portion  511  for swaging the shield conductor  203  and the second swaging portion  512  for tightening the coating material  202 . 
     An intermediate portion  513  having a taper outer peripheral surface is intervening between the first swaging portion  511  and the second swaging portion  512 . The second swaging portion  512  is located closer to the terminal  30  than the first swaging portion  511 . Namely, the terminal  30  is connected to a tip end of the central conductor  201  which extends from the second swaging portion  512  towards a side opposite to the first swaging portion  511 . 
     Each of the first swaging portion  511  and the second swaging portion  512  has a tubular shape and both have a common central axis. An inner diameter and an outer diameter of the first swaging portion  511  are formed to be smaller than an inner diameter and an outer diameter of the second swaging portion  512 . 
     The inner ring  50  comprising the metal is housed inside the first swaging portion  511 . As shown in  FIG. 7 , the inner ring  50  comprises a tubular pipe portion  500 , an annular outer collar portion  501  that projects more outwardly than an outer peripheral surface  500   a  of the pipe portion  500  at one end of the pipe portion  500 , and an annular inner collar portion  502  that projects more inwardly than an inner peripheral surface  500   b  of the pipe portion  500  at the other end of the pipe portion  500 , as one piece. The inner ring  50  comprises, e.g., metal having good electrical conductivity similarly to the first ferrule  51 . 
     The shield conductor  203  which it is exposed from the sheath  204  and turned down outside the sheath  204  is sandwiched between the inner peripheral surface  511   a  of the first swaging portion  511  in the inner ring  50  and the outer peripheral surface  500   a  of the pipe portion  500  in the first ferrule  51 . The outer collar portion  501  of the inner ring  50  abuts with the inner peripheral surface  511   a  of the first swaging portion  511 . Also, the inner peripheral surface  500   b  of the pipe portion  500  of the inner ring  50  contacts the outer peripheral surface  204   a  of the sheath  204 , and the inner collar portion  502  of the inner ring  50  is facing to an end face  204   b  of the sheath  204 . 
     The inner peripheral surface  512   a  of the second swaging portion  512  of the first ferrule  51  contacts the outer peripheral surface  202   a  of the coating material  202  over an entire periphery of the outer peripheral surface  202   a . Thereby, vibration in the central conductor  201  and the second swaging portion  512  of the coating material  202  is suppressed. 
     The first ferrule  51  is formed by reducing the diameter by swaging a tubular metal member having a uniform inner diameter and a uniform outer diameter entirely along a longitudinal direction. In this swaging step, plural (e.g., 6 to 8) swaging claws that are placed radially are pressed against the tubular metal member from the outside of the tubular metal member to reduce the diameter while maintaining the tubular shape. A diameter reduction rate in the second swaging portion  512  by this swaging step (a proportion of a difference of the outer diameter before and after the swaging step with respect to the outer diameter before the swaging step) is greater than a diameter reduction rate in the first swaging portion  511 , and the outer diameter of the second swaging portion  512  is smaller than the outer diameter of the first swaging portion  511  because of the difference in the diameter reduction rate. 
     Similarly to the first ferrule  51 , the third ferrule  53  comprises a first swaging portion for swaging the shield conductor  203  of the third cable  23 , and a second swaging portion for swaging the coating material  202 , and the second swaging portion is located closer to the terminal  30  than the first swaging portion. The first swaging portion of the third ferrule  53  swages the shield conductor  203  of the third cable  23  between the first swaging portion and the inner ring  50  located inside the first swaging portion. 
     The second ferrule  52  is formed, similarly to the first ferrule  51 , by reducing the diameter of the tubular metal member by swaging. Further, in the second ferrule  54 , as shown in  FIG. 4 , an end of the shield conductor  203  of the second cable  22  is turned down outside the sheath  204 , and the turned end of the shield conductor  203  is sandwiched between the inner ring  50  and the second ferrule  52 . However, the second ferrule  52  does not swage the coating material  202  of the second cable  22 . Namely, a second swaging portion for swaging the coating material  202  of the second cable  22  (a portion corresponding to the second swaging portion  512  of the first ferrule  51 ) is not provided in the second ferrule  52 . 
     In the wire harness  1  as described above, the three terminals  30  of the connector  3  are connected to the three terminals  72  of the counterpart connector  7 , respectively, by fitting the connector  3  into the counterpart connector  7 , so that the electric current flows through the central conductor  201  of each of the first to third cables  21  to  23  as mentioned above. Also, the fastening bolt  31  penetrating through the connector housing  40  engages threadedly to the female thread portion  701  of the counterpart connector  7 , so that the connector housing  40  is fixed securely to the housing  70  of the counterpart connector  7 . 
     Function and Effect of the Embodiment 
     According to the embodiment, the following function and effect would be provided as follow. 
     (1) As for the first cable  21 , the shield conductor  203  is swaged by the first swaging portion  511  of the first ferrule  51  and the coating material  202  is swaged by the second swaging portion  512 , and the second swaging portion  512  is located closer to the terminal  30  than the first swaging portion  511 , it is possible to suppress the vibration of the central conductor  201  and the coating material  202  between a part swaged by the first swaging portion  511  of the first ferrule  51  and the terminal  30 . Still further, it is possible to suppress the vibration of the terminal  30  due to the vibration propagated to the terminal  30  from the central conductor  201  and the coating material  202 . Namely, if the first ferrule  51  does not have the second swaging portion  512 , it is possible that the vibration of the central conductor  201  and the coating material  202  closer to the terminal  30  may cause the breakage of a part of strands constituting the central conductor, the detachment of the welded portion between the central conductor  201  and the terminal  30 , or the like. This is similar about the third cable  23  swaged by the third ferrule  53 . It should be noted that, about the second cable  22 , the vibration which may have an influence on the durability hardly occurs because the length of the second cable  22  in the connector housing  40  is shorter than first and third cables  21 ,  23 . The durability of the wire harness  1  is secured by these configurations. 
     (2) Because the first to third ferrules  51  to  53  are pressed against the receiving part  403  by the fixing members  61 ,  62 , the shield conductors  203  of the first to third cables  21  to  23  are electrically connected to the connector housing  40  via the first to third ferrules  51  to  53 . Thereby, it is possible to suppress the leakage of electromagnetic wave irradiated from the central conductor  201  exposed from the shield conductor  403  in the connector housing  40  to the outside of the connector housing  40 . 
     (3) Because the shield conductor  203  is sandwiched between each of the first to third ferrules  51  to  53  and the pipe portion  500  of the inner ring  50 , it is possible to suppress the swaging force from being dispersed into the central conductor  201  and the coating material  202 , so that it is possible to tighten the shield conductor  203  fairly. Also, because the end of the shield conductor  203  is turned down outside the sheath  204  and the turned end is swaged on the outer periphery side of the inner ring  50 , it is possible to swage the shield conductor  203  by the first to third ferrules  51  to  53  more securely. 
     (4) The second cable  22  has a shorter length than the first and third cables  21 ,  23  in the connector housing  40 , and the fastening bolt  31  is placed between the terminal  30  connected to the central conductor  201  of the first cable  21  and the terminal  30  connected to the central conductor  201  of the second cable  22 . Therefore, in comparison with the case where the length of the second cable  22  is substantially equal to the lengths of the first and third cables  21 ,  23  in the connector housing  40 , it is possible to downsize the connector  3 . Also, the length of the second cable  22  is longer than the first and third cable  21 ,  23  in the connector housing  40 , so that a distance between the terminals  30  is increased, thereby enhancing insulating properties by the increase in the creepage distance. 
     Summary of the Embodiment 
     Next, the technical concept that is ascertained from the embodiments described above will be described with the aid of the reference characters and the like in the embodiment. It should be noted, however, that each of the reference characters in the following description should not be construed as limiting the constituent elements in the claims to the members and the like specifically shown in the embodiments. 
     [1] A wire harness ( 1 ) comprises a cable ( 21 ) comprising a central conductor ( 201 ), a coating material ( 202 ) that coats the central conductor ( 201 ), and a shield conductor ( 203 ) that covers the coating material ( 202 ); a terminal ( 30 ) that is connected to the central conductor ( 201 ) of the cable ( 21 ); a connector housing ( 40 ) that houses an end of the cable ( 21 ) together with the terminal ( 30 ); a ferrule ( 51 ), that is electrically connected to the shield conductor ( 203 ) and comprises a tubular metal, into which the central conductor ( 201 ) and the coating material ( 202 ) inserted; and a fixing member ( 61 ) that fixes the ferrule ( 51 ) to the connector housing ( 40 ), in which the ferrule ( 51 ) comprises a swaging portion (a first swaging portion  511 ) for swaging the shield conductor ( 203 ) and a tightening portion (a second swaging portion  512 ) for tightening the coating material ( 202 ), wherein the tightening portion ( 512 ) is located closer to the terminal ( 30 ) than the swaging portion ( 511 ). 
     [2] In the wire harness ( 1 ) as described in the above [ 1 ], the connector housing ( 40 ) comprises an electrically conductive metal, and the ferrule ( 51 ) is electrically connected to the connector housing ( 40 ) by receiving a pressing force from the fixing member ( 61 ). 
     [3] The wire harness ( 1 ) as described in the above [ 1 ] or [ 2 ], further comprises an inner tubular member ( 50 ) housed in the ferrule ( 51 ), the shield conductor ( 203 ) being sandwiched between the inner tubular member ( 50 ) and an inner peripheral surface ( 511   a ) of the ferrule ( 51 ). 
     [4] The wire harness ( 1 ) as described in the above [3], further comprises a jacket ( 204 ) comprising an insulator and covering the shield conductor ( 203 ), an end of the shield conductor ( 203 ) being turned down outside the jacket ( 204 ) in the ferrule ( 51 ), the turned end of the shield conductor ( 203 ) being sandwiched between the inner tubular member ( 50 ) and the ferrule ( 51 ). 
     [5] In the wire harness ( 1 ) as described in the above [1], the cable comprises three cables ( 21  to  23 ), in which the central conductor ( 201 ) of one cable ( 22 ) of the three cables ( 21  to  23 ) has a shorter length than the central conductors ( 201 ) of the other cables ( 21 ,  23 ) in the connector housing ( 40 ), and the ferrule ( 52 ) connected to the shield conductor ( 203 ) of the one cable ( 22 ) is not provided with the tightening portion ( 512 ) and the one cable ( 22 ) is placed between the other cables ( 21 ,  23 ), and an attaching member ( 31 ) for attaching the connector housing ( 40 ) to an object for attachment ( 7 ) is placed between the terminals ( 30 ) connected to the central conductors ( 201 ) of the other cables ( 21 ,  23 ). 
     Although the embodiment of the present invention has been described above, the embodiment described above should not be construed as limiting the invention in the appended claims. It should also be noted that not all the combinations of the features described in the above embodiment are essential to the means for solving the problems of the invention. 
     The present invention may be enforced with appropriate modification without going beyond the gist of the invention. For example, in the embodiment, the case where the wire harness  1  is used for supplying the driving current to the electric motor which produces the driving force for running in the vehicle is described, but the application of the wire harness  1  is not limited thereto and can be applied to various applications. 
     Also, in the above embodiment, the case where the wire harness  1  comprises three cables is described, but the number of the cables is not limited thereto and may be one or two, or four or more. 
     Further, in the above embodiment, the case where the tightening portion to tighten the coating material  202  is formed by swaging is described, but the present invention is not limited thereto. The tightening portion may be tightened by, e.g., press-fitting of the coating material  202  into the first and third ferrules  51 ,  53 . Namely, it is enough if the first and third ferrules  51 ,  53  tighten the coating material  202  at an end on the terminal  30  side in the longitudinal direction and the inner peripheral surface adheres with the outer peripheral surface of the coating material  202 . Even, in this case, it is possible to provide the effect similar to the case where the coating material  202  is tightened by swaging. 
     Still further, in the embodiment, the case where the shield conductor  203  is swaged between the first swaging portion  511  of the first ferrule  51  and the inner ring  50  is described. However, if it is possible to contact the first ferrule  51  to the shield conductor  203  while maintaining sufficient strength and contact resistance, the inner ring  50  does not need to be used. It is similar about the second and third ferrules  52 ,  53 . 
     EXPLANATION OF REFERENCE NUMERALS 
     
         
           1  . . . Wire harness 
           201  . . . Central conductors 
           202  . . . Coating material 
           203  . . . Shield conductors 
           204  . . . Sheath (Jacket) 
           21  to  23  . . . First to third cables 
           30  . . . Terminal 
           31  . . . Fastening bolt (Attaching member) 
           40  . . . Connector housing 
           50  . . . Inner ring (Inner tubular member) 
           500  . . . Pipe portion 
           501  . . . Outer collar portion 
           502  . . . Inner collar portion 
           51  to  53  . . . First to third ferrules 
           511  . . . First swaging portion 
           512  . . . Second swaging portion 
           61 ,  62  . . . Fixing members 
           7  . . . Counterpart connector (Object for attachment)