Patent Publication Number: US-11646130-B2

Title: Wire harness capable of suppressing a decrease in insulation reliability

Description:
This application claims priority from Japanese Patent Application No. 2021-021256 filed Feb. 12, 2021, the entire disclosure of which is incorporated herein by reference. 
     BACKGROUND 
     The present disclosure relates to a wire harness. 
     Conventionally, wire harnesses to be used in vehicles such as hybrid cars and electric cars include electric wires for electrically connecting electric apparatuses such as a high-voltage battery and an inverter (see JP 2017-62995A, for example). In this type of wire harness, a plurality of electric wires are collectively surrounded by a metal pipe made of a metal for the purpose of protecting the electric wires and taking measures against noise. 
     SUMMARY 
     In the case of a conventional wire harness, the metal pipe is bent in a state in which a plurality of electric wires are inserted into the metal pipe. As shown in  FIG.  8   , a plurality of electric wires  110  and  120  inserted into a metal pipe  100  are simultaneously bent during this bending process. As a result, the electric wires  110  and  120  come into contact with the inner circumferential surface of the metal pipe  100  at an inner bent part  102  of a bent portion  101  of the metal pipe  100 . At this time, as shown in  FIG.  9   , the electric wires  110  and the electric wires  120  may overlap each other at the inner bent part  102 . In this case, the electric wires  120  may be compressed between the inner surface of the inner bent part  102  of the metal pipe  100  and the outer circumferential surfaces of the electric wires  110 . This compression may cause a problem in that the thicknesses of insulating coatings  121  of the electric wires  120  are reduced, thus resulting in a decrease in the insulation reliability of the electric wires  120 . 
     An exemplary aspect of the disclosure provides a wire harness capable of suppressing a decrease in insulation reliability. 
     A wire harness of the present disclosure includes: a plurality of first electric wire members that each have a first flexible electric wire and a hard electric wire electrically connected to the first flexible electric wire: a second electric wire member that is a second flexible electric wire: a tube through which the plurality of first electric wire members and the second electric wire member pass: and a fixing member for bundling the plurality of first electric wire members and the second electric wire member, wherein the tube includes a bend, the wire harness is configured to achieve a first arrangement, an arrangement of the plurality of first electric wire members and the second electric wire member inside the bend is the first arrangement in which the plurality of first electric wire members are lined up in a first direction and the second electric wire member is lined up with the plurality of first electric wire members in a second direction that intersects the first direction, the plurality of first electric wire members are each in contact with an inner circumferential surface of the bend inside the bend and the second electric wire member is provided in a space surrounded by outer circumferential surfaces of the plurality of first electric wire members and the inner circumferential surface of the bend inside the bend, and the second electric wire member is spaced apart from the outer circumferential surfaces of the plurality of first electric wire members and/or the inner circumferential surface of the bend. 
     The wire harness of the present disclosure exhibits an effect of suppressing a decrease in insulation reliability. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a schematic configuration diagram illustrating a wire harness of an embodiment. 
         FIG.  2    is a schematic cross-sectional view illustrating the wire harness of the embodiment. 
         FIG.  3    is a schematic lateral cross-sectional view illustrating the wire harness of the embodiment (a cross-sectional view taken along line  3 - 3  in  FIG.  2   ). 
         FIG.  4    is a schematic lateral cross-sectional view illustrating the wire harness of the embodiment (a cross-sectional view taken along line  4 - 4  in  FIG.  2   ). 
         FIG.  5    is an explanatory diagram illustrating the relationship between the outer diameters of electric wire members and the inner diameter of a tubular member. 
         FIG.  6    is a schematic lateral cross-sectional view illustrating the wire harness of the embodiment (a cross-sectional view taken along line  6 - 6  in  FIG.  2   ). 
         FIG.  7    is a schematic lateral cross-sectional view illustrating a wire harness of a modified example. 
         FIG.  8    is a schematic side view illustrating a conventional wire harness. 
         FIG.  9    is a schematic lateral cross-sectional view illustrating the conventional wire harness (a cross-sectional view taken along line  9 - 9  in  FIG.  8   ). 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Description of Embodiments of the Present Disclosure 
     First, embodiments of the present disclosure will be listed and described. 
     (1) A wire harness of the present disclosure includes: a plurality of first electric wire members that each have a first flexible electric wire and a hard electric wire electrically connected to the first flexible electric wire: a second electric wire member that is a second flexible electric wire: a tubular member through which the plurality of first electric wire members and the second electric wire member pass: and a fixing member for bundling the plurality of first electric wire members and the second electric wire member, wherein the tubular member includes a bent portion, an arrangement of the first electric wire members and the second electric wire member inside the bent portion is a first arrangement in which the plurality of first electric wire members are lined up in a first direction and the second electric wire member is lined up with the first electric wire members in a second direction that intersects the first direction, the plurality of first electric wire members are each in contact with an inner circumferential surface of the bent portion, inside the bent portion, and the second electric wire member is provided in a space surrounded by outer circumferential surfaces of the plurality of first electric wire members and the inner circumferential surface of the bent portion, inside the bent portion, and the second electric wire member is spaced apart from the outer circumferential surfaces of the first electric wire members and/or the inner circumferential surface of the bent portion. 
     With this configuration, the second electric wire member is provided in the space surrounded by the outer circumferential surfaces of the plurality of first electric wire members and the inner circumferential surface of the bent portion, inside the bent portion, and the second electric wire member is spaced apart from the outer circumferential surfaces of the first electric wire members and/or the inner circumferential surface of the bent portion. Accordingly, it is possible to keep the second electric wire member from being compressed by the outer circumferential surfaces of the first electric wire members and the inner circumferential surface of the bent portion. Thus, it is possible to suppress damage to the insulating coatings of the first electric wire members and the insulating coating of the second electric wire member in the bent portion. As a result, it is possible to suppress a decrease in the insulation reliability of the first electric wire members and the second electric wire member. 
     Here, the term “tubular” as used herein encompasses not only such a shape that is formed by a circumferential wall continuously formed over the entire circumference in the circumferential direction, but also a tubular shape formed by an assembly of a plurality of components, and a shape such as a C-shape in which a portion in the circumferential direction is cut out. Moreover, the external edge of the “tubular shape” may have a circular shape, an elliptical shape, or a polygonal shape with sharp corners or rounded corners. 
     (2) It is preferable that the wire harness includes a plurality of the fixing members, the plurality of fixing members each keep the arrangement of the first electric wire members and the second electric wire member as the first arrangement, and the plurality of fixing members are provided at intervals in a longitudinal direction of the tubular member. With this configuration, it is possible to favorably keep the arrangement of the first electric wire members and the second electric wire member inside the tubular member as the first arrangement using the plurality of fixing members that are provided at intervals in the longitudinal direction of the tubular member. 
     (3) It is preferable that the plurality of fixing members are provided on both sides of the bent portion in the longitudinal direction of the tubular member. With this configuration, it is possible to keep the arrangement of the first electric wire members and the second electric wire member on both sides of the bent portion as the first arrangement using the plurality of fixing members provided on both sides of the bent portion. Thus, it is possible to favorably keep the arrangement of the first electric wire members and the second electric wire member in the bent portion provided between the plurality of fixing members as the first arrangement. 
     (4) It is preferable that a lateral cross-sectional shape of the first electric wire members is a perfect circle, a lateral cross-sectional shape of the second electric wire member is a perfect circle, a lateral cross-sectional shape of the tubular member is a perfect circle, and in the first arrangement, two of the first electric wire members are in external contact with each other, and the second electric wire member is provided in a gap formed between outer circumferences of the two first electric wire members. With this configuration, the second electric wire member is provided in the gap formed between the outer circumferences of the two first electric wire members that are in external contact with each other. Thus, it is possible to favorably bring the second electric wire member into contact with the outer circumferential surfaces of the two first electric wire members. Accordingly, it is possible to increase the contact area between the first electric wire members and the second electric wire member compared with a configuration in which the second electric wire member comes into contact with only one first electric wire member. Therefore, it is possible to, for example, favorably disperse stress applied to the second electric wire member due to vibrations or the like, thus making it possible to favorably suppress damage to the insulating coating of the second electric wire member. Here, the term “perfect circle” as used herein encompasses a precisely perfect circle as well as a circle that is acceptable as a substantially perfect circle. 
     (5) It is preferable that, when a radius of an outer circumference of the second electric wire member is defined as a, a radius of the outer circumference of each of the two first electric wire members is defined as b, and a radius of an inner circumference of the tubular member is defined as c, a radius of an outer circumference of the second electric wire member is set to a value smaller than the radius a that satisfies Formula 1 below: 
     
       
         
           
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     When two first electric wire members and one second electric wire member are in external contact with one another, and all of the two first electric wire members and the second electric wire member are in internal contact with the inner circumferential surface of the tubular member, Formula 1 above is satisfied. Accordingly, when Formula 1 above is satisfied, the second electric wire member is in contact with the outer circumferential surfaces of the two first electric wire members and is in contact with the inner circumferential surface of the tubular member. In contrast, with the above-mentioned configuration, the radius of the outer circumference of the second electric wire member is set to a value smaller than the radius a that satisfies Formula 1 above. This enables the second electric wire member to be favorably spaced apart from the outer circumferential surfaces of the two first electric wire members and/or the inner circumferential surface of the bent portion. Therefore, it is possible to more favorably keep the second electric wire member from being compressed by the outer circumferential surfaces of the first electric wire members and the inner circumferential surface of the bent portion. 
     (6) It is preferable that an outer diameter of the second electric wire member is smaller than outer diameters of the first electric wire members. With this configuration, it is possible to keep the second electric wire member from being compressed by the outer circumferential surfaces of the first electric wire members and the inner circumferential surface of the bent portion even if the outer diameter of the second electric wire member is smaller than the outer diameters of the first electric wire members. 
     (7) It is preferable that the wire harness includes two second electric wire members, and in the first arrangement, the two second electric wire members are respectively provided in two gaps formed between outer circumferences of the two first electric wire members. With this configuration, the two second electric wire members are respectively provided in the two gaps formed between the two first electric wire members. Accordingly, it is possible to favorably keep the two second electric wire members from being arranged between the outer circumferential surfaces of the two first electric wire members and the inner circumferential surface of the bent portion, inside the bent portion. Thus, it is possible to favorably keep the second electric wire members from being compressed by the outer circumferential surfaces of the first electric wire members and the inner circumferential surface of the bent portion. 
     (8) It is preferable that the hard electric wires in a longitudinal direction of the first electric wire members are provided in the bent portion. With this configuration, it is possible to keep the second electric wire member from being compressed by the outer circumferential surfaces of the plurality of hard electric wires and the inner circumferential surface of the bent portion, inside the bent portion. As a result, it is possible to suppress damage to the insulating coatings of the hard electric wires and the insulating coating of the second electric wire member. 
     Details of Embodiments of the Present Disclosure 
     The following describes specific embodiments of a wire harness of the present disclosure with reference to the drawings. A portion of the configuration may be exaggerated or simplified for illustrative purposes in the diagrams. In addition, the ratios between the dimensions of portions shown in the diagrams may be different from each other. The terms “parallel” and “orthogonal” as used herein encompass not only “precisely parallel” and “precisely orthogonal” but also “substantially parallel” and “substantially orthogonal”, as long as the functions and effects of these embodiments are exhibited. Note that the present disclosure is not limited to these embodiments and is defined by the scope of the appended claims, and all changes that fall within the same essential spirit as the scope of the claims are intended to be included therein. 
     Overall Configuration of Wire Harness  10   
     As shown in  FIG.  1   , a wire harness  10  electrically connects two or three or more electric apparatuses M 1 , M 2 , M 3 , and M 4 . The wire harness  10  is installed, for example, in a vehicle V such as a hybrid car or an electric car. The wire harness  10  includes a plurality of (two in this embodiment) electric wire members  20  that electrically connect the electric apparatus M 1  and the electric apparatus M 2 , and one or more (two in this embodiment) electric wire members  50  that electrically connect the electric apparatus M 3  and the electric apparatus M 4 . The wire harness  10  includes, for example, a tubular member  60  (tube) through which the electric wire members  20  and the electric wire members  50  pass, a tubular exterior member  66  that surrounds the portions of the electric wire members  20  extending from the tubular member  60 , and a tubular exterior member  67  that surrounds the portions of the electric wire members  50  extending from the tubular member  60 . The tubular member  60  includes end portions  61  and  62  in the longitudinal direction of the tubular member  60 . The exterior members  66  and  67  are provided corresponding to the end portions  61  and  62  of the tubular member  60 , respectively. The tubular member  60  and the exterior members  66  and  67  protect the electric wire members  20  and  50  housed therein from flying objects and waterdrops. 
     Configuration of Electric Wire Member  20   
     One end portion of each electric wire member  20  is connected to the electric apparatus M 1 , and the other end portion of each electric wire member  20  is connected to the electric apparatus M 2 . An example of the electric apparatus 
     M 1  is an inverter that is installed in the front portion of the vehicle V, and an example of the electric apparatus M 2  is a high-voltage battery that is installed on the rear side of the vehicle V with respect to the electric apparatus M 1 . The inverter is connected, for example, to a wheel driving motor that serves as a power source for vehicle travel. The high-voltage battery can supply, for example, a voltage of a hundred volts or more. 
     As shown in  FIG.  2   , each electric wire member  20  includes a flexible electric wire  30 , and a hard electric wire  40  that is electrically connected to the flexible electric wire  30 . The electric wire member  20  is formed by electrically connecting the flexible electric wire  30  and the hard electric wire  40 , which are different types of electric wires, in the longitudinal direction of the electric wire member  20 . The electric wire member  20  includes a connection portion  22  where the flexible electric wire  30  and the hard electric wire  40  are joined to each other, and a covering member  23  that covers the outer circumference of the connection portion  22 . In the electric wire member  20 , the flexible electric wires  30  are connected to both end portions in the longitudinal direction of the hard electric wire  40 . The flexible electric wire  30  and the hard electric wire  40  are, for example, high-voltage electric wires to which a high voltage/a large current can be applied. The flexible electric wire  30  and the hard electric wire  40  may each be, for example, a shielded electric wire having an electromagnetic shielding structure, or a non-shielded electric wire having no electromagnetic shielding structure. The flexible electric wire  30  and the hard electric wire  40  of this embodiment are non-shielded electric wires. Note that, although  FIG.  2    shows the structures of the electric wire members  20  and  50  at the end portion  61  of the tubular member  60 , the structures of the electric wire members  20  and  50  at the end portion  62  of the tubular member  60  (see  FIG.  1   ) are the same as these structures. 
     Configuration of Flexible Electric Wire  30   
     The flexible electric wire  30  is, for example, more flexible than the hard electric wire  40 . The flexible electric wire  30  has, for example, higher bendability than the hard electric wire  40 . 
     The flexible electric wire  30  includes a core wire  31  constituted by a plurality of metal strands, and an insulating coating  32  that covers the outer circumference of the core wire  31 . Examples of the core wire  31  include a stranded wire formed by twisting a plurality of metal strands together, and a braided member formed by braiding a plurality of metal strands into a tubular shape. The core wire  31  of this embodiment is a stranded wire. Examples of the material of the core wire  31  include metal materials such as copper-based materials and aluminum-based materials. 
     The insulating coating  32  covers, for example, the outer circumferential surface of the core wire  31  over the entire circumference in the circumferential direction thereof. The insulating coating  32  is made of, for example, an insulating material such as a synthetic resin. 
     The shape of the cross section of the flexible electric wire  30  taken along a plane orthogonal to the longitudinal direction of the flexible electric wire  30 , namely the lateral cross-sectional shape of the flexible electric wire  30 , may be a desired shape. The lateral cross-sectional shape of the flexible electric wire  30  may be, for example, a circular shape, a semicircular shape, a polygonal shape, a square shape, or a flat shape. The lateral cross-sectional shape of the flexible electric wire  30  of this embodiment is a perfect circle. 
     Configuration of Hard Electric Wire  40   
     The hard electric wire  40  has, for example, higher flexural rigidity than the flexible electric wire  30 . The hard electric wire  40  has, for example, such rigidity that enables the hard electric wire  40  to keep a shape extending along the wiring path of the electric wire member  20 . 
     The hard electric wire  40  includes, for example, a single-core wire  41  constituted by a single conductor, and an insulating coating  42  that covers the outer circumference of the single-core wire  41 . Examples of the single-core wire  41  include a columnar conductor constituted by a single columnar metal rod having a solid structure, and a tubular conductor having a hollow structure. The single-core wire  41  of this embodiment is a columnar conductor. Examples of the material of the single-core wire  41  include metal materials such as copper-based materials and aluminum-based materials. 
     The insulating coating  42  covers, for example, the outer circumferential surface of the single-core wire  41  over the entire circumference in the circumferential direction thereof. The insulating coating  42  is made of, for example, an insulating material such as a synthetic resin. For example, a heat-shrinkable tube or a rubber tube can also be used as the insulating coating  42 . 
     The lateral cross-sectional shape of the hard electric wire  40  may be a desired shape. The lateral cross-sectional shape of the hard electric wire  40  of this embodiment is a perfect circle. 
     Configuration of Connection Portion  22   
     The core wire  31  and the single-core wire  41  are joined to each other at the connection portion  22 . Specifically, the core wire  31  exposed from the insulating coating  32  at an end portion in the longitudinal direction of the flexible electric wire  30  is joined to the single-core wire  41  exposed from the insulating coating  42  at an end portion in the longitudinal direction of the hard electric wire  40 . For example, at the connection portion  22 , the core wire  31  and the single-core wire  41  are stacked in the radial direction, namely a direction that intersects the longitudinal direction of the core wire  31  and the single-core wire  41 , and are joined to each other. Note that there is no particular limitation on the method of connecting the core wire  31  and the single-core wire  41 . Examples of the method of connecting the core wire  31  and the single-core wire  41  include supersonic welding and laser welding. 
     Configuration of Covering Member  23   
     The covering member  23  is formed, for example, in an elongated tubular shape. The covering member  23  covers the outer circumference of the connection portion  22 . For example, the covering member  23  spans the end portion of the insulating coating  32  and the end portion of the insulating coating  42 . For example, one end portion of the covering member  23  covers the outer circumferential surface of the end portion of the insulating coating  32 , and the other end portion of the covering member  23  covers the outer circumferential surface of the end portion of the insulating coating  42 . The covering member  23  surrounds the outer circumference of the flexible electric wire  30  and the outer circumference of the hard electric wire  40  over the entire circumference in the circumferential direction thereof. The covering member  23  has, for example, a function of keeping the connection portion  22  electrically insulated. Examples of the covering member  23  include a shrinkable tube, a rubber tube, a resin mold, a hot melt adhesive, and a tape member. The covering member  23  of this embodiment is a heat-shrinkable tube. 
     Here, the hard electric wire  40  is provided, for example, inside the tubular member  60 . For example, the tubular member  60  surrounds the hard electric wire  40  over the entire length in the longitudinal direction of the hard electric wire  40 . The connection portion  22  is provided, for example, inside the tubular member  60 . For example, an end portion in the longitudinal direction of the flexible electric wire  30  is provided inside the tubular member  60 . The flexible electric wire  30  is provided such that a portion thereof extends toward the outside of the tubular member  60  from the end portion  61  in the longitudinal direction of the tubular member  60 . 
     Configuration of Electric Wire Member  50   
     As shown in  FIG.  1   , one end portion of each electric wire member  50  is connected to the electric apparatus M 3 , and the other end portion of each electric wire member  50  is connected to the electric apparatus M 4 . An example of the electric apparatus M 3  is a relay box that is installed in the front portion of the vehicle V, and an example of the electric apparatus M 4  is a low-voltage battery that is installed in the rear portion of the vehicle V. The relay box distributes a voltage supplied from the low-voltage battery to various apparatuses installed in the vehicle V. The low-voltage battery can supply a lower voltage (e.g., 12 volts) than the high-voltage battery does. 
     As shown in  FIG.  3   , the electric wire members  50  are flexible electric wires  50 A. That is, each electric wire member  50  is constituted by only a single flexible electric wire  50 A. The flexible electric wire  50 A extends over the entire length in the longitudinal direction of the electric wire member  50 . The flexible electric wire  50 A is, for example, a low-voltage electric wire. The flexible electric wire  50 A may be, for example, a shielded electric wire or a non-shielded electric wire. The flexible electric wire  50 A of this embodiment is a non-shielded electric wire. 
     Configuration of Flexible Electric Wire  50 A 
     The flexible electric wire  50 A is, for example, more flexible than the hard electric wire  40 . The flexible electric wire  50 A has, for example, higher bendability than the hard electric wire  40 . 
     The flexible electric wire  50 A includes a core wire  51  constituted by a plurality of metal strands, and an insulating coating  52  that covers the outer circumference of the core wire  51 . Examples of the core wire  51  include a stranded wire and a braided member. The core wire  51  of this embodiment is a stranded wire. Examples of the material of the core wire  51  include metal materials such as copper-based materials and aluminum-based materials. 
     The insulating coating  52  covers, for example, the outer circumferential surface of the core wire  51  over the entire circumference in the circumferential direction thereof. The insulating coating  52  is made of, for example, an insulating material such as a synthetic resin. 
     The lateral cross-sectional shape of the flexible electric wire  50 A may be a desired shape. The lateral cross-sectional shape of the flexible electric wire  50 A of this embodiment is a perfect circle. The outer diameter of the flexible electric wire  50 A is, for example, smaller than the outer diameter of the hard electric wire  40 . The outer diameter of the flexible electric wire  50 A is, for example, smaller than the outer diameter of the flexible electric wire  30  (see  FIG.  2   ). 
     As shown in  FIG.  1   , for example, an intermediate portion in the longitudinal direction of the flexible electric wire  50 A is provided inside the tubular member  60 . For example, the intermediate portion in the longitudinal direction of the flexible electric wire  50 A is housed inside the tubular member  60  together with the electric wire members  20 . Both end portions in the longitudinal direction of the flexible electric wire  50 A respectively extend toward the outside of the tubular member  60  from the end portions  61  and  62  in the longitudinal direction of the tubular member  60 . 
     Configuration of Tubular Member  60   
     The tubular member  60  is formed in an elongated tubular shape. The tubular member  60  of this embodiment is formed in a tubular shape whose cross-sectional shape is a perfect circle. That is, the lateral cross-sectional shape of the tubular member  60  of this embodiment is a perfect circle. For example, the intermediate portions in the longitudinal directions of the electric wire members  20  and  50  are housed inside the tubular member  60 . The inner diameter of the tubular member  60  is set to, for example, a size that enables the two electric wire members  20  and the two electric wire members  50  to be housed thereinside. The tubular member  60  surrounds, for example, the outer circumferences of the electric wire members  20  and  50  over the entire circumference in the circumferential direction thereof. The tubular member  60  is, for example, harder than the insulating coatings  32 ,  42 , and  52  of the electric wire members  20  and  50  (see  FIGS.  2  and  3   ). Examples of the tubular member  60  include a metal pipe made of a metal and a resin pipe made of a resin. Examples of the material of the metal pipe include metal materials such as aluminum-based materials and copper-based materials. Examples of the material of the resin pipe include synthetic resins such as polyolefins, polyamides, polyesters, and ABS resins. The tubular member  60  of this embodiment is a metal pipe. 
     The tubular member  60  is bent, for example, two-dimensionally or three-dimensionally. The tubular member  60  includes a linear portion  63 A that is located at the end portion  61  and extends linearly in the vehicle front-rear direction, a bent portion  64 A (bend) that is provided at one end portion of the linear portion  63 A, and a linear portion  63 B that extends downward from the bent portion  64 A in the vehicle vertical direction. The tubular member  60  includes a bent portion  64 B that is provided at one end portion of the linear portion  63 B, a linear portion  63 C that extends rearward from the bent portion  64 B in the vehicle front-rear direction, a bent portion  64 C that is provided at one end portion of the linear portion  63 C, and a linear portion  63 D that extends upward from the bent portion  64 C in the vehicle vertical direction. 
     For example, in the case of the wire harness  10 , the bent portions  64 A,  64 B, and  64 C are formed in the tubular member  60  by inserting linear electric wire members  20  and  50  into a linear tubular member  60  and then bending the tubular member  60  in which the electric wire members  20  and  50  are housed. At this time, the tubular member  60  and the electric wire members  20  and  50  inserted into the tubular member  60  are simultaneously bent. Also, in the case of the wire harness  10  of this embodiment, the bending process is started on the end portion  61  side in the longitudinal direction of the tubular member  60 , and this bending process is sequentially performed toward the end portion  62 . That is, the bent portions  64 A,  64 B, and  64 C are formed in this order through the tubular member  60  bending process. Note that the bent portion  64 A is the closest to the end portion  61  out of the plurality of bent portions  64 A,  64 B, and  64 C. 
     As shown in  FIG.  2   , the linear portions  63 A and  63 B are respectively continuous with both sides of the bent portion  64 A. The bent portion  64 A is bent, for example, at a right angle. For example, the bent portion  64 A is bent such that the direction in which the central axis of the linear portion  63 A extends is orthogonal to the direction in which the central axis of the linear portion  63 B extends. The bent portion  64 A includes an inner bent part  65 . Portions of the electric wire members  20  and  50  located inside the bent portion  64 A are bent along the bent portion  64 A. 
     The linear portion  63 A is provided between an end surface  61 A at the end portion  61  in the longitudinal direction of the tubular member  60  and the bent portion  64 A. For example, the connection portions  22  of the electric wire members  20  are housed inside the linear portion  63 A. 
     Configurations of Exterior Members  66  and  67   
     As shown in  FIG.  1   , the exterior members  66  and  67  have an elongated tubular shape. The exterior members  66  and  67  are provided, for example, at both end portions in the longitudinal direction of the wire harness  10 . For example, the end portions in the longitudinal direction of the electric wire members  20  are housed inside the exterior members  66 . For example, only the portions of the electric wire members  20  extending from the tubular member  60  out of the portions of the electric wire members  20  and  50  extending from the tubular member  60  are housed inside the exterior members  66 . The exterior members  66  surround, for example, the outer circumferences of the flexible electric wires  30  in the longitudinal direction of the electric wire members  20  over the entire circumference in the circumferential direction thereof. For example, the end portions in the longitudinal direction of the electric wire members  50  are housed inside the exterior members  67 . For example, only the portions of the electric wire members  50  extending from the tubular member  60  out of the portions of the electric wire members  20  and  50  extending from the tubular member  60  are housed inside the exterior members  67 . The exterior members  67  surround, for example, the outer circumferences of the electric wire members  50  over the entire circumference in the circumferential direction thereof. Examples of the exterior members  66  and  67  include corrugated tubes and waterproof covers. 
     In the wire harness  10 , the electric wire members  20  and  50  are housed in the tubular member  60  together, and the portions of the electric wire members  20  and the electric wire members  50  that extend outward from the tubular member  60  diverge from each other to different paths. The portions of the electric wire members  20  and the portions of the electric wire members  50  that diverge from each other to different paths are housed inside the exterior members  66  and the exterior members  67 , respectively. 
     Configurations of Fixing Members  70 ,  71 , and  72   
     As shown in  FIG.  2   , the wire harness  10  includes fixing members  70 ,  71 , and  72  for bundling the plurality of electric wire members  20  and the plurality of electric wire members  50 . Each of the fixing members  70 ,  71 , and  72  bundles the plurality of electric wire members  20  and  50  together, and fixes the arrangement (layout) of the plurality of electric wire members  20  and  50 . Here, the arrangement of the plurality of electric wire members  20  and  50  means the relative positions (alignment positions) of the plurality of electric wire members  20  and the plurality of electric wire members  50  relative to one another on the lateral cross section including the electric wire members  20  and  50 . 
     The fixing members  70 ,  71 , and  72  are provided, for example, at intervals in the longitudinal direction of the tubular member  60 . The fixing member  70  is provided, for example, between the connection portions  22  and the end surface  61 A of the tubular member  60  in the longitudinal direction of the tubular member  60 . The fixing member  71  is provided, for example, between the connection portions  22  and the bent portion  64 A in the longitudinal direction of the tubular member  60 . 
     The fixing member  72  is provided, for example, inside the linear portion  63 B. The fixing member  71  and the fixing member  72  are respectively provided on both sides of the bent portion  64 A in the longitudinal direction of the tubular member  60 . 
     The fixing members  70 ,  71 , and  72  are each formed, for example, by winding a tape member  73  around the plurality of electric wire members  20  and  50 . The tape member  73  includes, for example, an adhesive layer on one surface thereof. As shown in  FIG.  3   , the tape member  73  is wound onto the outer circumferential surfaces of the electric wire members  20  and  50 , for example, in a state in which the adhesive layer faces the electric wire members  20  and  50 . The tape member  73  is wound around the electric wire members  20  and  50 , for example, a plurality of times. The tape member  73  fastens, for example, the electric wire members  20  and  50  in a direction in which these electric wire members approach each other. 
     Note that, although not illustrated, a plurality of fixing members for bundling the electric wire members  20  and  50  are also provided at intervals in the longitudinal direction of the tubular member  60  inside the linear portions  63 C and  63 D and the bent portions  64 B and  64 C shown in  FIG.  1   . 
     Arrangement of Electric Wire Members  20  and  50   
     Next, the arrangement of the electric wire members  20  and  50  inside the tubular member  60  will be described. 
     First, the arrangement of the electric wire members  20  and  50  in the bent portion  64 A will be described with reference to  FIG.  4   . The hard electric wires  40  in the longitudinal direction of the electric wire members  20  are routed in the bent portion  64 A. 
     As shown in  FIG.  4   , in the bent portion  64 A, the two hard electric wires  40  are lined up in a first direction (the left-right direction in the diagram here) that intersects the longitudinal direction of the electric wire members  20 . In the bent portion  64 A, the flexible electric wires  50 A are lined up with the hard electric wires  40  in a second direction that intersects the first direction in which the two hard electric wires  40  are lined up. Note that the arrangement of the electric wire members  20  and  50  as described above may also be referred to as a “first arrangement” for illustrative purposes. 
     Subsequently, the first arrangement of the electric wire members  20  and  50  will be described in more detail. 
     The two hard electric wires  40  are, for example, in external contact with each other. That is, the outer circumferential surfaces of the insulating coatings  42  of the two hard electric wires  40  are in contact with each other at one point in the circumferential directions of the hard electric wires  40 . The two flexible electric wires  50 A are lined up, for example, in a direction that is orthogonal to the first direction (the vertical direction in the diagram here) in a state in which the two hard electric wires  40  are located therebetween. For example, the two flexible electric wires  50 A are provided in gaps formed between the outer circumferences of the two hard electric wires  40 . For example, the two flexible electric wires  50 A are respectively provided in two gaps formed between the outer circumferences of the two hard electric wires  40 . Each of the flexible electric wires  50 A is, for example, in external contact with the two hard electric wires  40 . For example, each of the flexible electric wires  50 A is provided in a gap formed between the two hard electric wires  40  such that the outer circumferential surface of the insulating coating  52  is in contact with the outer circumferential surfaces of the two hard electric wires  40 . 
     Next, the arrangement of the electric wire members  20  and  50  relative to the tubular member  60  will be described. 
     In the bent portion  64 A, the hard electric wires  40  and the flexible electric wires  50 A are located closer to the inner bent part  65  of the bent portion  64 A than the outer bent part thereof. The two hard electric wires  40  are, for example, in internal contact with the tubular member  60 . The two hard electric wires  40  are, for example, in contact with the inner circumferential surface of the bent portion  64 A. For example, the outer circumferential surface of the insulating coating  42  of each of the two hard electric wires  40  is in contact with the inner surface of the inner bent part  65  at one point in the circumferential direction of the tubular member  60 . The hard electric wires  40  are, for example, in external contact with each other and in internal contact with the tubular member  60 . 
     Each of the two flexible electric wires  50 A is provided in a space surrounded by the outer circumferential surfaces of the two hard electric wires  40  and the inner circumferential surface of the tubular member  60 . One of the two flexible electric wires  50 A that is provided closer to the inner bent part  65  is provided in a space surrounded by the inner surface of the inner bent part  65  and portions of the outer circumferential surfaces of the two hard electric wires  40  that are opposed to the inner bent part  65 . In the following description, one of the two flexible electric wires  50 A that is provided at a position closer to the inner bent part  65  is referred to as a “flexible electric wire  50 B” for illustrative purposes. The flexible electric wire  50 B is spaced apart from the outer circumferential surfaces of the hard electric wires  40  and/or the inner surface of the inner bent part  65 . When the flexible electric wire  50 B is in contact with, for example, the outer circumferential surfaces of the hard electric wires  40 , the flexible electric wire  50 B is spaced apart from the inner circumferential surface of the tubular member  60 . When the flexible electric wire  50 B is in contact with, for example, the inner circumferential surface of the tubular member  60 , the flexible electric wire  50 B is spaced apart from the outer circumferential surfaces of the hard electric wires  40 . In the example shown in  FIG.  4   , the flexible electric wire  50 B is in external contact with the two hard electric wires  40  and is spaced apart from the inner surface of the inner bent part  65 . The outer diameter of the flexible electric wire  50 B is set to such a size that enables the flexible electric wire  50 B to be spaced apart from the outer circumferential surfaces of the hard electric wires  40  and/or the inner surface of the inner bent part  65 . The following is a detailed description of the outer diameter of the flexible electric wire  50 B. 
     The following is a description of a case where two hard electric wires  40  and one flexible electric wire  50 B are in external contact with one another, and all of the two hard electric wires  40  and the one flexible electric wire  50 B are in internal contact with the tubular member  60  as shown in  FIG.  5   . At this time, when the radius of the outer circumference of the flexible electric wire  50 B is defined as a, the two hard electric wires  40  have the same outer diameter, the radius of the outer circumference of each of the hard electric wires  40  is defined as b, and the radius of the inner circumference of the tubular member  60  is defined as c, Formula 1 below is satisfied (Descartes&#39; Circle Theorem). Note that, in  FIG.  5   , only the flexible electric wire  50 B of the two flexible electric wires  50 A is shown and the members are not hatched to simplify the diagram. 
     
       
         
           
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     When Formula 1 above is satisfied, the flexible electric wire  50 B is in contact with the outer circumferential surfaces of the two hard electric wires  40  and is in contact with the inner circumferential surface of the tubular member  60 . Accordingly, when Formula 1 above is satisfied, the flexible electric wire  50 B may be compressed between the outer circumferential surfaces of the two hard electric wires  40  and the inner circumferential surface of the tubular member  60 . Therefore, in this embodiment, the radius of the outer circumference of the flexible electric wire  50 B is set to a value smaller than the radius a that satisfies Formula 1 above. By setting the radius of the outer circumference of the flexible electric wire  50 B as described above, the flexible electric wire  50 B can be spaced apart from the outer circumferential surfaces of the hard electric wires  40  and/or the inner circumferential surface of the tubular member  60  as shown in  FIG.  4   . Accordingly, it is possible to keep the flexible electric wire  50 B from being compressed between the outer circumferential surfaces of the two hard electric wires  40  and the inner circumferential surface of the tubular member  60 . 
     In the bent portion  64 A, the lateral cross-sectional shape of the hard electric wires  40 , the lateral cross-sectional shape of the flexible electric wire  50 B, and the lateral cross-sectional shape of the tubular member  60  may be slightly changed from a perfect circle to an elliptical shape or the like due to the bending process or the like. However, even in such a case, the lateral cross-sectional shape of the hard electric wires  40 , the lateral cross-sectional shape of the flexible electric wire  50 B, and the lateral cross-sectional shape of the tubular member  60  are considered an unchanged perfect circle in Formula 1 above. 
     Note that the arrangement of the electric wire members  20  and  50  in the bent portions  64 B and  64 C shown in  FIG.  1    is preferably the same as the arrangement in the bent portion  64 A shown in  FIG.  4   . However, the arrangement of the electric wire members  20  and  50  in all of the bent portions  64 A,  64 B, and  64 C included in the tubular member  60  need not necessarily be the arrangement shown in  FIG.  4   . For example, it is sufficient that the arrangement of the electric wire members  20  and  50  is the arrangement shown in  FIG.  4    in at least one of the bent portions  64 A,  64 B, and  64 C. 
     Next, the arrangement of the electric wire members  20  and  50  at a position of the linear portion  63 A shown in  FIG.  2    that is close to the bent portion  64 A will be described.  FIG.  3    shows the lateral cross-sectional shapes of the electric wire members  20  and  50 , the tubular member  60 , and the fixing member  71  at the position at which the fixing member  71  is provided. 
     As shown in  FIG.  3   , the arrangement of the two hard electric wires  40  and the two flexible electric wires  50 A is the first arrangement as in the case of the bent portion  64 A shown in  FIG.  4   . In this embodiment, the two hard electric wires  40  are in external contact with each other, and each of the flexible electric wires  50 A is in external contact with the two hard electric wires  40 . The two hard electric wires  40  and the two flexible electric wires  50 A are bundled using, for example, the tape member  73  constituting the fixing member  71 . Thus, the arrangement of the two hard electric wires  40  and the two flexible electric wires  50 A is kept as the first arrangement. The hard electric wires  40  and the flexible electric wires  50 A bundled together using the fixing member  71  are arranged, for example, at the central portion in the radial direction of the tubular member  60 . At this time, the outer circumferential surface of the fixing member  71 , the outer circumferential surfaces of the hard electric wires  40 , and the outer circumferential surfaces of the flexible electric wires  50 A are not in contact with, for example, the inner circumferential surface of the tubular member  60 . 
     The arrangement of the two hard electric wires  40  and the two flexible electric wires  50 A is the first arrangement in the linear portion  63 B shown in  FIG.  2    as in the case shown in  FIG.  3   . The arrangement of the two hard electric wires  40  and the two flexible electric wires  50 A is kept as the first arrangement by the fixing member  72 . Thus, the arrangement of the electric wire members  20  and  50  is kept as the first arrangement between the fixing member  71  and the fixing member  72 . Accordingly, the arrangement of the electric wire members  20  and  50  is kept as the first arrangement inside the bent portion  64 A provided between the fixing member  71  and the fixing member  72 . 
     Next, the arrangement of the electric wire members  20  and  50  at the position in the longitudinal direction of the linear portion  63 A at which the fixing member  70  is provided will be described. The flexible electric wires  30  in the longitudinal direction of the electric wire members  20  are routed in the portion provided with the fixing member  70 .  FIG.  6    shows the lateral cross-sectional shapes of the electric wire members  20  and  50 , the tubular member  60 , and the fixing member  70  at the position at which the fixing member  70  is provided. 
     As shown in  FIG.  6   , the arrangement of the two electric wire members  20  and the two electric wire members  50  is the first arrangement as in the case of the bent portion  64 A shown in  FIG.  4   . In this embodiment, the two flexible electric wires  30  are in external contact with each other, and each of the flexible electric wires  50 A is in external contact with the two flexible electric wires  30 . The two flexible electric wires  30  and the two flexible electric wires  50 A are bundled using, for example, the tape member  73  constituting the fixing member  70 . Thus, the arrangement of the two flexible electric wires  30  and the two flexible electric wires  50 A is kept as the first arrangement. Accordingly, the arrangement of the electric wire members  20  and  50  is kept as the first arrangement between the fixing member  70  and the fixing member  71  shown in  FIG.  2   . Therefore, the arrangement of the electric wire members  20  and  50  is kept as the first arrangement at the connection portions  22  provided between the fixing member  70  and the fixing member  71 . 
     The following is a description of the functions and effects of this embodiment. 
     (1) The electric wire members  50  are provided in the spaces surrounded by the outer circumferential surfaces of the plurality of electric wire members  20  and the inner circumferential surface of the bent portion  64 A, inside the bent portion  64 A, and the electric wire members  50  are each spaced apart from the outer circumferential surfaces of the electric wire members  20  and/or the inner circumferential surface of the bent portion  64 A. Accordingly, it is possible to keep the electric wire members  50  from being compressed by the outer circumferential surfaces of the electric wire members  20  and the inner circumferential surface of the tubular member  60 . Thus, it is possible to suppress damage to the insulating coatings  42  of the hard electric wires  40  and the insulating coatings  52  of the electric wire members  50  in the bent portion  64 A. As a result, it is possible to suppress a decrease in the insulation reliability of the electric wire members  20  and the electric wire members  50 . 
     (2) The fixing members  71  and  72  for bundling the electric wire members  20  and  50  are provided on both sides of the bent portion  64 A in the longitudinal direction of the tubular member  60 . It is possible to keep the arrangement of the electric wire members  20  and  50  on both sides of the bent portion  64 A as the first arrangement using these fixing members  71  and  72 . Thus, it is possible to favorably keep the arrangement of the electric wire members  20  and  50  in the bent portion  64 A as the first arrangement. 
     (3) In the first arrangement, the electric wire members  50  are provided in the gaps formed between the outer circumferences of the two electric wire members  20  that are in external contact with each other. Accordingly, it is possible to favorably bring each electric wire member  50  into contact with the outer circumferential surfaces of the two electric wire members  20 . Thus, it is possible to increase the contact area between the electric wire members  20  and the electric wire members  50  compared with a configuration in which each electric wire member  50  comes into contact with only one electric wire member  20 . Therefore, it is possible to, for example, favorably disperse stress applied to the electric wire members  50  due to vibrations or the like, thus making it possible to favorably suppress damage to the insulating coatings  52  of the electric wire members  50 . 
     (4) The radii of the outer circumferences of the electric wire members  50  are set to a value smaller than the radius a that satisfies Formula 1 above. This enables the electric wire members  50  to be favorably spaced apart from the outer circumferential surfaces of the two electric wire members  20  and/or the inner circumferential surface of the bent portion  64 A. Therefore, it is possible to more favorably keep the electric wire members  50  from being compressed by the outer circumferential surfaces of the electric wire members  20  and the inner circumferential surface of the tubular member  60 . 
     (5) Using Formula 1 makes it easy to determine whether or not the electric wire member  50  will come into contact with all of the outer circumferential surfaces of the electric wire members  20  and the inner circumferential surface of the tubular member  60  based on the outer diameters of the electric wire members  20  and  50  and the inner diameter of the tubular member  60 . Also, it is possible to adjust the outer diameters of the electric wire members  20  or the inner diameter of the tubular member  60  such that the radii of the outer circumferences of the electric wire members  50  are smaller than the radius a in Formula  1  above. 
     (6) The two flexible electric wires  50 A are respectively provided in two gaps formed between the outer circumferences of the two hard electric wires  40  inside the bent portion  64 A. Accordingly, it is possible to keep the flexible electric wires  50 A from being compressed between the outer circumferential surfaces of the hard electric wires  40 , which have high flexural rigidity, and the inner circumferential surface of the hard tubular member  60 . Also, it is possible to keep the flexible electric wires  50 A from being compressed by the two hard electric wires  40 . As a result, it is possible to favorably suppress damage to the insulating coatings  42  of the hard electric wires  40  and the insulating coatings  52  of the flexible electric wires  50 A. 
     Other Embodiments 
     The embodiment mentioned above can be implemented with various modifications as follows. The embodiment mentioned above and the following modified examples can be implemented in combination with each other as long as they are technically compatible with each other. 
     In the embodiment mentioned above, the hard electric wires  40  in the longitudinal direction of the electric wire members  20  are provided inside the bent portion  64 A, but there is no limitation to this configuration. For example, the flexible electric wires  30  in the longitudinal direction of the electric wire members  20  may be provided inside the bent portion  64 A. In this case, inside the bent portion  64 A, the flexible electric wires  50 B are provided in spaces surrounded by the outer circumferential surfaces of the two flexible electric wires  30  and the inner circumferential surface of the bent portion  64 A. 
     There is no particular limitation on the number of electric wire members  50  that pass through the tubular member  60  in the embodiment mentioned above, and the number of electric wire members  50  can be changed in accordance with the specifications of the vehicle V. 
     For example, as shown in  FIG.  7   , a configuration may also be employed in which a single electric wire member  50  passes through the tubular member  60 . In this case as well, the electric wire member  50  is provided in a space between the inner surface of the inner bent part  65  and the outer circumferential surfaces of the two electric wire members  20  that are in contact with the inner circumferential surface of the bent portion  64 A, inside the bent portion  64 A. Also, the number of electric wire members  50  that pass through the tubular member  60  may be set to three or more. 
     There is no particular limitation on the number of electric wire members  20  that pass through the tubular member  60  in the embodiment mentioned above, and the number of electric wire members  20  can be changed in accordance with the specifications of the vehicle V. The number of electric wire members  20  that pass through the tubular member  60  may also be, for example, three or more. 
     There is no particular limitation on the structure of the tubular member  60  of the embodiment mentioned above. For example, there is no particular limitation on the number of bent portions  64 A,  64 B, and  64 C in the tubular member  60 . Also, there is no particular limitation on the bending angles of the bent portions  64 A,  64 B, and  64 C. 
     In the embodiment mentioned above, the fixing members  70 ,  71 , and  72  are constituted by the tape member  73 , but there is no limitation to this configuration. For example, metal bands or resin zip ties may also be used as the fixing members  70 ,  71 , and  72 . 
     The plurality of connection portions  22  in the embodiment mentioned above may also be arranged at positions that are shifted from each other in the longitudinal direction of the electric wire members  20 . Moreover, the plurality of connection portions  22  may also be arranged side by side extending in the longitudinal direction of the electric wire members  20 . 
     The tubular member  60  of the embodiment mentioned above is not limited to a metal member or resin member made of a single material. For example, the tubular member  60  may also be a complex member obtained by providing a conductive shielding layer on or inside a non-metal pipe main body. 
     In the embodiment mentioned above, an exterior member having, for example, a branched path may be provided between the tubular member  60  and the exterior members  66  and  67 . An example of such an exterior member is a waterproof cover made of a rubber. 
     Although not specifically stated in the embodiment mentioned above, a configuration may also be employed in which an electromagnetic shield member is provided inside the tubular member  60 . For example, the electromagnetic shield member collectively surrounds the plurality of electric wire members  20 . The electromagnetic shield member is provided, for example, between the inner circumferential surface of the tubular member  60  and the outer circumferential surfaces of the electric wire members  20 . Examples of the electromagnetic shield member include flexible braided wires and metal foils. 
     In the embodiment mentioned above, both the electric wire member  20  (constituted by the flexible electric wire  30  and the hard electric wire  40 ) and the electric wire member  50  (constituted by the flexible electric wire  50 A) are realized as non-shielded electric wires, but there is no limitation to this configuration. For example, the electric wire member  20  may be a non-shielded electric wire, and the electric wire member  50  may be a shielded electric wire. For example, the electric wire member  20  may be a shielded electric wire, and the electric wire member  50  may be a non-shielded electric wire. For example, both of the electric wire members  20  and  50  may be shielded electric wires. 
     In the embodiment mentioned above, the outer diameters of the electric wire members  50  are smaller than the outer diameters of the electric wire members  20 , but there is no limitation to this configuration. The outer diameters of the electric wire members  50  may be the same as the outer diameters of the electric wire members  20  or larger than the outer diameters of the electric wire members  20 . 
     The positional relationship between the electric apparatuses M 1  to M 4  in the vehicle V is not limited to that of the embodiment mentioned above, and may also be changed as appropriate in accordance with the vehicle configuration. 
     The embodiments disclosed herein are exemplary in all respects, and should be construed as being not limitative. The scope of the present disclosure is indicated by the scope of the appended claims rather than the above description, and all changes that fall within the same essential spirit as the scope of the claims are intended to be included therein.