Wire harness

Abstract

A wire harness (WH) comprises: a wiring material (10) having a bridging part (11) bridged between a vehicle body (100) and a slide door (200) along an arm member (71) of a link mechanism (70) that connects the slide door (200) to the vehicle body (100) in a manner enabling the slide door (200) to open / close between a fully open position (P1) and a fully closed position (P2); and a helical coil spring (20) that is externally fitted to the bridging part (11) between one longitudinal-direction end portion (11a) and the other longitudinal-direction end portion (11b) of the bridging part (11). The coil spring (20) expands and contracts as the slide door (200) opens and closes between the fully open position (P1) and the fully closed position (P2), thereby regulating the routing path of an extra length portion (12) of the bridging part (11) that occurs in a state in which the slide door (200) is positioned at least at the fully closed position (P2).

Description

Wire harness

[0001] The present invention relates to a wire harness.

[0002] As an example of a conventional technology relating to wire harnesses, Patent Document 1 discloses a wire harness including a wiring material having a bridge portion that spans between the vehicle body and the sliding door, and a coil spring that applies a biasing force to the excess portion of the bridge portion when the sliding door is positioned at an intermediate position between a fully open position and a fully closed position relative to the vehicle body.

[0003] JP 2010-163116 A

[0004] Incidentally, in the wire harness described in the above-mentioned Patent Document 1, for example, the coil spring can prevent the excess length of the bridge section from sagging when the sliding door is positioned in the intermediate position, but there is room for further improvement in terms of more appropriately holding the excess length.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wire harness that can more appropriately hold the excess length of the crossover portion.

[0006] In order to achieve the above object, the wire harness of the present invention comprises a wiring material having a bridge portion that is spanned between the vehicle body and the sliding door along an arm member of a link mechanism that connects the sliding door to the vehicle body so that the sliding door can be opened and closed between a fully open position and a fully closed position, and a spiral coil spring that is wrapped around the bridge portion between one end and the other end in the longitudinal direction of the bridge portion, and the coil spring expands and contracts as the sliding door opens and closes between the fully open position and the fully closed position, thereby regulating the wiring path of the excess portion of the bridge portion that is generated when the sliding door is positioned at least in the fully closed position.

[0007] In the wire harness according to the present invention, the coil spring expands and contracts as the sliding door opens and closes between the fully open position and the fully closed position, thereby restricting the routing path of the excess length of the crossover portion that occurs when the sliding door is positioned at least in the fully closed position. With this configuration, the wire harness can, for example, restrict the routing path of the excess length of the crossover portion by the expansion and contraction of the coil spring, thereby improving the appearance of the crossover portion when the sliding door is positioned in the fully closed position and suppressing vibrations and abnormal noises of the crossover portion when the sliding door is positioned in the fully closed position and the vehicle is running. As a result, the wire harness has the effect of more appropriately retaining the excess length of the crossover portion.

[0008] Fig. 1 is an exemplary plan view of a wire harness according to an embodiment, showing a state in which a sliding door is positioned at a fully open position. Fig. 2 is an exemplary plan view of a wire harness according to an embodiment, showing a state in which a sliding door is positioned at a fully closed position. Fig. 3 is an exemplary perspective view of a wire harness according to an embodiment, showing a state in which a sliding door is positioned at a fully open position. Fig. 4 is an exemplary perspective view of a wire harness according to an embodiment, showing a state in which a sliding door is positioned at a fully closed position. Fig. 5 is an exemplary cross-sectional view of a bridge portion of a wire harness according to an embodiment.

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially identical. Note that in this specification, ordinal numbers are used only to distinguish between parts, members, portions, positions, directions, etc., and do not indicate order or priority.

[0010] [Embodiment] FIG. 1 is a plan view of a wire harness WH according to an embodiment, showing a state in which a sliding door 200 is positioned in a fully open position P1. The wire harness WH of this embodiment shown in FIG. 1 is installed in a vehicle such as an automobile. Here, the wire harness WH is, for example, a bundle of wiring materials 10 used for power supply and signal communication to connect various devices mounted on the vehicle, and the wiring materials 10 are connected to the various devices using connectors or the like. The wire harness WH of this embodiment includes, for example, a wiring material 10 having a bridge portion 11 that spans between a vehicle body 100 and a sliding door 200, and a spiral coil spring 20 that is externally mounted across one end 11a and the other end 11b of the bridge portion 11. In addition, the wire harness WH may further include a protector, a fixing device, a grommet, or the like.

[0011] In the following description, of the first, second, and third directions that intersect with one another, the first direction will be referred to as the "vehicle longitudinal direction X," the second direction will be referred to as the "vehicle width direction Y," and the third direction will be referred to as the "vehicle height direction Z." Here, the vehicle longitudinal direction X, the vehicle width direction Y, and the vehicle height direction Z are approximately perpendicular to one another. The vehicle longitudinal direction X typically corresponds to the longitudinal direction of the vehicle (the vehicle body 100 and the sliding door 200), the vehicle width direction Y typically corresponds to the width direction of the vehicle, and the vehicle height direction Z typically corresponds to the up-down direction (vertical direction) of the vehicle. Unless otherwise specified, the directions used in the following description will be described as directions in a state in which the wire harness WH is assembled to the vehicle (the vehicle body 100 and the sliding door 200).

[0012] 2 is a plan view of the wire harness WH, illustrating a state in which the sliding door 200 is positioned at a fully closed position P2. As shown in FIGS. 1 and 2 , the sliding door 200 is connected to the vehicle body 100 via an arm member 71 of a link mechanism 70 so as to be able to open and close between a fully open position P1 (see FIG. 1 ) and a fully closed position P2 (see FIG. 2 ). The fully open position P1 is a position where the sliding door 200 fully opens the vehicle entrance opening that opens toward the vehicle width direction Y, and the fully closed position P2 is a position where the sliding door 200 fully closes the entrance opening. The sliding door 200 is configured to be slidable in the vehicle front-rear direction X between the fully open position P1 and the fully closed position P2 by the arm member 71 of the link mechanism 70.

[0013] In the link mechanism 70, one end of an arm member 71 is pivotally supported on the vehicle body 100 via a vehicle-side rotation shaft 72 extending along the vehicle height direction Z, for example. A first arm holding member 73 is fixed to the vehicle body 100, which holds one end of the arm member 71 rotatably around the rotation center of the vehicle-side rotation shaft 72. In addition, in the link mechanism 70, the other end of the arm member 71 is pivotally supported on the sliding door 200 via a door-side rotation shaft 74 extending along the vehicle height direction Z, for example. A second arm holding member 75 is fixed to the sliding door 200, which holds the other end of the arm member 71 rotatably around the rotation center of the door-side rotation shaft 74.

[0014] The arm member 71 includes, for example, a bottom wall 71a and a pair of side walls 71b. The bottom wall 71a has a predetermined height (width) along the vehicle height direction Z and extends between the vehicle body side rotation shaft 72 and the door side rotation shaft 74. The pair of side walls 71b (see FIG. 3) are provided at both ends of the bottom wall 71a in the vehicle height direction Z, protrude toward the wiring material 10, and extend between the vehicle body side rotation shaft 72 and the door side rotation shaft 74. The arm member 71 has a substantially U-shaped cross section that is open toward the wiring material 10 by the bottom wall 71a and the pair of side walls 71b. The arm member 71 has a recess defined by the bottom wall 71a and the pair of side walls 71b.

[0015] Here, the vehicle is equipped with a sliding door power supply device for supplying power from a power source (such as a secondary battery) on the vehicle body 100 side to electrical connection objects on the sliding door 200 side. The electrical connection objects are, for example, components installed on the sliding door 200, such as electrical components and switches. The electrical components of the sliding door 200 refer to, for example, a drive device for operating a power window and a speaker. The switches of the sliding door 200 refer to, for example, a switch for operating a power window, a switch for operating a power seat, and the like. In this sliding door power supply device, a wire harness WH electrically connects the power source on the vehicle body 100 side to the electrical connection objects on the sliding door 200 side. In other words, the sliding door power supply device includes the wire harness WH of this embodiment.

[0016] Fig. 3 is a perspective view of the wire harness WH when the sliding door 200 is positioned at a fully open position P1, and Fig. 4 is a perspective view of the wire harness WH when the sliding door 200 is positioned at a fully closed position P2. As shown in Figs. 3 and 4, the wire harness WH includes, for example, a wiring material 10, a coil spring 20, a vehicle body-side holding member 50, and a door-side holding member 60.

[0017] The wiring material 10 has, for example, one end electrically connected to a power source on the vehicle body 100 side and the other end electrically connected to an electrical connection object on the sliding door 200 side. The wiring material 10 is configured to include, for example, a wire bundle in which a plurality of electric wires W (see FIG. 5) are bundled together, and a flexible tube C as a tubular exterior material covering the wire bundle. The wiring material 10 has relatively high flexibility and good bendability in an installed state in which the flexible tube C is attached to the wire bundle. When the wiring material 10 of this embodiment is installed in a state in which the flexible tube C is attached to the wire bundle, and is bent by applying an external force from a natural state (approximately straight state) in which no external force is applied, the bent portion elastically deforms, and an elastic reaction force is generated in the bent portion, causing it to return to its original state.

[0018] The wiring material 10 (see FIGS. 3 and 4 ) has, for example, a crossing section 11, a vehicle body-side wiring section 13, and a door-side wiring section 14. The crossing section 11 is a section of the wiring material 10 that is bridged between the vehicle body 100 and the sliding door 200 along the arm member 71 of the link mechanism 70. The crossing section 11 includes the above-mentioned multiple electric wires W and a flexible tube C that is wrapped around the multiple electric wires W. The crossing section 11 is, for example, offset from the arm member 71 in the vehicle fore-and-aft direction X toward the fully open position P1 of the sliding door 200 and extends along the arm member 71. One longitudinal end 11a of the crossing section 11 is held by the vehicle body-side holding member 50, and the other longitudinal end 11b is held by the door-side holding member 60. The transition portion 11 is held by the vehicle body side holding member 50 and the door side holding member 60 in a state capable of following the movement (opening and closing) of the sliding door 200 between the fully open position P1 and the fully closed position P2.

[0019] The vehicle body-side routing portion 13 is a portion that is routed in a routing space portion on the vehicle body 100 side at the tip of one longitudinal end portion 11a of the crossover portion 11. The vehicle body-side routing portion 13 may be configured to include, for example, the above-mentioned plurality of electric wires W and a flexible tube C that is wrapped around the plurality of electric wires W, or may be configured only with the plurality of electric wires W. The vehicle body-side routing portion 13 is drawn out from the vehicle body-side holding member 50 along the vehicle width direction Y, and extends toward a power source on the vehicle body 100 side to be electrically connected to the power source.

[0020] The door-side routing portion 14 is a portion that is routed in a routing space portion on the sliding door 200 side at the other longitudinal end portion 11b of the crossover portion 11. The door-side routing portion 14 may be configured to include, for example, the above-mentioned plurality of electric wires W and a flexible tube C that is wrapped around the plurality of electric wires W, or may be configured only with the plurality of electric wires W. The door-side routing portion 14 is drawn out from the door-side holding member 60 along the vehicle height direction Z, and extends toward an object to be electrically connected on the sliding door 200 side to be electrically connected to the object to be electrically connected.

[0021] The vehicle body holding member 50 holds one longitudinal end 11 a of the crossover portion 11 and one longitudinal end 20 a of the coil spring 20. The vehicle body holding member 50 includes, for example, a base portion 51, a fan portion 52, and an attachment portion 53. The base portion 51 is, for example, configured in a substantially rectangular tubular shape with an insertion space that opens along the vehicle width direction Y. The one end 11 a of the crossover portion 11 and the one end 20 a of the coil spring 20 are inserted into the base portion 51 along the vehicle width direction Y. The base portion 51 also has a through hole through which the vehicle body routing portion 13 is drawn out along the vehicle width direction Y. In the present embodiment, for example, the base portion 51 holds the one end 11 a of the crossover portion 11 and the one end 20 a of the coil spring 20 in a state in which movement of the crossover portion 11 and the coil spring 20 along the longitudinal direction relative to the vehicle body holding member 50 is restricted.

[0022] The fan portion 52 is provided at an end of the base portion 51 opposite the through hole through which the vehicle-body-side wiring portion 13 is pulled out in the vehicle width direction Y. The fan portion 52 is formed in a fan shape when viewed from the vehicle height direction Z (see FIG. 2 ), for example. An opening 52a is provided inside the fan portion 52, communicating with the insertion space of the base portion 51 and widening in a fan shape (trumpet shape) toward the sliding door 200 in the vehicle width direction Y. The opening 52a allows the transition portion 11 to swing around a rotation center extending in the vehicle height direction Z in response to the movement (opening and closing) of the sliding door 200 between the fully open position P1 and the fully closed position P2. The mounting portion 53 protrudes from the base portion 51 in a plate-like shape along the vehicle fore-and-aft direction X, for example. The mounting portion 53 has a mounting hole through which a fastening member is attached to fasten the vehicle-body-side holding member 50 to the vehicle body 100.

[0023] The door-side holding member 60 holds the other longitudinal end 11b of the bridge portion 11 and the other longitudinal end 20b of the coil spring 20. The door-side holding member 60 includes, for example, a bottom wall portion 61, a pair of side wall portions 62, a first tubular portion 63, and a second tubular portion 64. The bottom wall portion 61 is formed, for example, in a substantially rectangular plate shape extending along the sliding door 200. The bottom wall portion 61 is provided with mounting holes into which fastening members for fastening the door-side holding member 60 and the sliding door 200 are attached. The pair of side wall portions 62 are provided at both ends of the bottom wall portion 61 in the vehicle height direction Z and protrude along the vehicle width direction Y. One of the pair of side wall portions 62 is provided with a through-hole through which the door-side routing portion 14 is drawn along the vehicle height direction Z.

[0024] The first tubular portion 63 extends in a tubular shape between the pair of side wall portions 62. The first tubular portion 63 is supported by the pair of side wall portions 62 so as to be rotatable about a rotation center extending along the vehicle height direction Z. The second tubular portion 64 is fixed to the outer peripheral surface of the first tubular portion 63 and is configured to be rotatable together with the first tubular portion 63 about a rotation center extending along the vehicle height direction Z. The second tubular portion 64 has insertion holes through which the other end portion 11 b of the transition portion 11 and the other end portion 20 b of the coil spring 20 are inserted. The insertion holes communicate with the internal space of the first tubular portion 63. In this embodiment, for example, the second tubular portion 64 holds the other end portion 11 b of the transition portion 11 and the other end portion 20 b of the coil spring 20 in a state in which movement of the transition portion 11 and the coil spring 20 along the longitudinal direction relative to the door-side holding member 60 is restricted. The door-side wiring portion 14 is connected to the other longitudinal end 11 b of the transition portion 11 via the internal space of the first cylindrical portion 63 and the insertion hole of the second cylindrical portion 64 .

[0025] In the wire harness WH of this embodiment, the shortest path connecting the vehicle body-side holding member 50 and the door-side holding member 60 differs depending on whether the sliding door 200 is in the fully open position P1 or the fully closed position P2 relative to the vehicle body 100. Therefore, in the wire harness WH, when the shortest path between the vehicle body-side holding member 50 and the door-side holding member 60 is the longest, the crossing portion 11 is routed without slack between the vehicle body-side holding member 50 and the door-side holding member 60, and the path length in this state is set as the length of the crossing portion 11.

[0026] Here, the path length of the transition portion 11 routed without slack between the vehicle-body holding member 50 and the door-side holding member 60 is shorter when the shortest path between the vehicle-body holding member 50 and the door-side holding member 60 is shortest, i.e., when the sliding door 200 is at the fully closed position P2 (see FIG. 2), than when the shortest path between the vehicle-body holding member 50 and the door-side holding member 60 is longest, i.e., when the sliding door 200 is at the fully closed position P1 (see FIG. 1). Therefore, in the transition portion 11, when the shortest path between the vehicle-body holding member 50 and the door-side holding member 60 is shortest, i.e., when the sliding door 200 is at the fully closed position P2, an excess portion appears as an excess length portion 12.

[0027] The coil spring 20 regulates the routing path of the excess length portion 12 of the transition portion 11. The coil spring 20 is, for example, a compression coil spring, and is provided across one end 11a and the other end 11b of the transition portion 11 in the longitudinal direction. In the present embodiment, for example, when the sliding door 200 is positioned at the fully open position P1 (see FIG. 1 ), the coil spring 20 is disposed in a free state (not elastically deformed) between the one end 11a and the other end 11b of the transition portion 11, i.e., between the vehicle body holding member 50 and the door side holding member 60. In this state, the transition portion 11 is routed between the vehicle body holding member 50 and the door side holding member 60 without slack along the shortest route, and therefore, due to the tension of the transition portion 11, the transition portion 11 extends substantially parallel to the arm member 71.

[0028] On the other hand, when the sliding door 200 is positioned at the fully closed position P2 (see FIG. 2 ), the coil spring 20 is disposed between the vehicle-body holding member 50 and the door-side holding member 60 in a state compressed more than in a free state, i.e., in a state in which a biasing force (elastic restoring force) is applied toward both longitudinal ends of the bridge portion 11. In this state, since the bridge portion 11 has a loosened excess portion 12 between the vehicle-body holding member 50 and the door-side holding member 60, the routing path of the excess portion 12 is restricted by the expansion and contraction of the coil spring 20. In this embodiment, when the sliding door 200 is positioned at the fully closed position P2, the coil spring 20 is curved by the fan portion 52 of the vehicle-body holding member 50 and the second tubular portion 64 of the door-side holding member 60 so as to be spaced apart from the arm member 71 in a convex state toward the outside in the vehicle width direction Y. That is, in this embodiment, when viewed from the vehicle height direction Z, the gap G between the coil spring 20 (bridge portion 11) and the arm member 71 is wider when the sliding door 200 is positioned at the fully closed position P2 (see Figure 2) than when it is positioned at the fully open position P1 (see Figure 1).

[0029] Fig. 5 is a cross-sectional view of a transition portion 11 of a wire harness WH. As shown in Fig. 5, the transition portion 11 includes, for example, a plurality of electric wires W and a flexible tube C that is wrapped around the plurality of electric wires W. The plurality of electric wires W extend linearly along the longitudinal direction of the transition portion 11 and are formed to extend with approximately the same diameter in the longitudinal direction (extension direction). The electric wire W has a conductor portion (core wire) made of a plurality of conductive metal wires, the outside of which is covered with an insulating coating portion having insulation properties. The electric wire W has, for example, a core wire with a substantially circular cross-sectional shape and an insulating coating portion with a substantially annular cross-sectional shape, so that the overall cross-sectional shape is substantially circular.

[0030] The flexible tube C is formed into a flexible cylindrical (tubular) shape using, for example, an insulating resin material. A plurality of electric wires W are inserted inside the flexible tube C, which covers and protects the outer peripheries of the plurality of electric wires W. The flexible tube C is formed, for example, by a shrinkable tube that is expandable and contractible along the longitudinal direction of the bridge portion 11. The flexible tube C is formed, for example, into a vertically elongated flat shape along the vehicle height direction Z. This prevents the flexible tube C constituting the bridge portion 11 (excess length portion 12) from sagging along the vehicle height direction Z. In the present embodiment, the coil spring 20 is formed, for example, into a flat shape that follows the outer shape of the flexible tube C constituting the above-described bridge portion 11, and is attached to the outer periphery of the flexible tube C. A gap may be provided between the outer periphery of the flexible tube C and the coil spring 20.

[0031] As described above, in the wire harness WH of this embodiment, the coil spring 20 expands and contracts as the sliding door 200 opens and closes between the fully open position P1 and the fully closed position P2, thereby restricting the routing path of the excess length 12 of the crossover portion 11 that occurs when the sliding door 200 is positioned at least at the fully closed position P2. With this configuration, the wire harness WH can, for example, restrict the routing path of the excess length 12 of the crossover portion 11 by the expansion and contraction of the coil spring 20, thereby improving the appearance of the crossover portion 11 when the sliding door 200 is positioned at the fully closed position P2 and suppressing vibrations and abnormal noises of the crossover portion 11 when the sliding door 200 is positioned at the fully closed position P2 and while the vehicle is running. As a result, the wire harness WH can more appropriately hold the excess length 12 of the crossover portion 11.

[0032] Furthermore, in the wire harness WH of this embodiment, when the sliding door 200 is positioned at the fully closed position P2, the coil spring 20 is disposed between the one end 11a and the other end 11b of the transition portion 11 in a state compressed more than in a free state. With this configuration, for example, when the sliding door 200 is positioned at the fully closed position P2, the biasing force (elastic restoring force) of the coil spring 20 makes it difficult for the coil spring 20 itself to slacken, and as a result, the excess length portion 12 of the transition portion 11 can be more appropriately held.

[0033] The wire harness WH of this embodiment also includes a vehicle-body-side holding member 50 that is provided on the vehicle body 100 and that holds one longitudinal end 20a of the coil spring 20 together with one end 11a of the crossover portion 11, and a door-side holding member 60 that is provided on the sliding door 200 and that holds the other longitudinal end 20b of the coil spring 20 together with the other end 11b of the crossover portion 11. With this configuration, the wire harness WH can, for example, more appropriately expand and contract the coil spring 20 by the vehicle-body-side holding member 50 and the door-side holding member 60 as the sliding door 200 opens and closes between the fully open position P1 and the fully closed position P2.

[0034] In the wire harness WH of the present embodiment, the crossover portion 11 includes a plurality of electric wires W and a flexible tube C through which the plurality of electric wires W are inserted, and the coil spring 20 is fitted to the flexible tube C that constitutes the crossover portion 11. With this configuration, the wire harness WH can, for example, suppress interference between the plurality of electric wires W and the coil spring 20 by the flexible tube C, and can therefore more appropriately hold the excess length portion 12 of the crossover portion 11.

[0035] In the above embodiment, the crossover portion 11 (routing material 10) is exemplified as including a plurality of electric wires W and a flexible tube C that is wrapped around the plurality of electric wires W, but the present invention is not limited to this example, and for example, the crossover portion 11 (routing material 10) may be composed of only a plurality of electric wires W. Also, in the above embodiment, the coil spring 20 is exemplified as being wrapped around the flexible tube C, i.e., being provided on the outer surface of the flexible tube C, but the present invention is not limited to this example, and for example, the coil spring 20 may be provided on the inner surface of the flexible tube C. Also, in the above embodiment, the coil spring 20 is exemplified as being a compression coil spring, but the present invention is not limited to this example, and the coil spring 20 may be exemplified as being a tension coil spring.

[0036] In the above embodiment, the flexible tube C is exemplified as a shrinkable tube, but is not limited to this example and may be, for example, a bellows-shaped corrugated tube having a plurality of annular recesses formed on its outer circumferential surface. In this case, for example, by arranging the coil spring 20 in a state where it is engaged with the annular recesses of the corrugated tube, the biasing force (elastic restoring force) of the coil spring 20 can be applied to the flexible tube C, making it difficult for the excess length portion 12 of the bridge portion 11 to slacken.

[0037] In the above embodiment, the coil spring 20 is formed with a constant coil pitch along the longitudinal direction of the coil spring 20, but the present invention is not limited to this example, and the coil pitch may be formed with partially different pitches along the longitudinal direction. This makes it possible to control the curved shape (bending R) of the coil spring 20 to any position or shape when the sliding door 200 is positioned at the fully closed position P2 (see FIG. 2 ). Note that the coil spring 20 can restrict the routing path of the excess length portion 12 of the crossover portion 11 when the sliding door is positioned at the fully closed position P2 and when the sliding door is positioned at an intermediate position between the fully open position P1 and the fully closed position P2.

[0038] While the above describes exemplary embodiments of the present invention, the above embodiments are merely examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the spirit of the invention. Furthermore, the specifications of each configuration, shape, and the like (structure, type, direction, format, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be appropriately modified and implemented.

[0039] REFERENCE SIGNS LIST 10 Wiring material 11 Crossover portion 11a One end portion 11b Other end portion 12 Excess length portion 20 Coil spring 20a One end portion 20b Other end portion 50 Vehicle body side holding member 60 Door side holding member 70 Link mechanism 71 Arm member 100 Vehicle body 200 Sliding door P1 Fully open position P2 Fully closed position C Flexible tube W Electric wire X Vehicle longitudinal direction Y Vehicle width direction Z Vehicle height direction

Claims

1. A wire harness comprising: a wiring material having a bridge section that is bridged between a vehicle body and a sliding door along an arm member of a link mechanism that connects the sliding door to the vehicle body so that the door can be opened and closed between a fully open position and a fully closed position; and a spiral coil spring that is wrapped around the bridge section between one end and the other end in the longitudinal direction of the bridge section, wherein the coil spring expands and contracts as the sliding door opens and closes between the fully open position and the fully closed position, thereby regulating the wiring path of the excess length of the bridge section that occurs when the sliding door is positioned at least in the fully closed position.

2. The wire harness according to claim 1, wherein the coil spring is disposed between the one end and the other end of the bridge portion in a state that is more compressed or stretched than in a free state when the sliding door is positioned at the fully closed position.

3. A wire harness as set forth in claim 1 or 2, comprising: a vehicle body-side holding member provided on the vehicle body and holding one longitudinal end of the coil spring together with the one end of the crossover portion; and a door-side holding member provided on the sliding door and holding the other longitudinal end of the coil spring together with the other end of the crossover portion.

4. A wire harness according to claim 1 or 2, wherein the transition portion includes a plurality of electric wires and a flexible tube through which the plurality of electric wires are inserted, and the coil spring is fitted on the exterior of the flexible tube that constitutes the transition portion.

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