Wire harness

Abstract

To provide a wire harness which can be made smaller in a diameter and is excellent in flexibility.SOLUTION: A wire harness 1 includes a plurality of power supply wires 2, at least one multicore electric wire 4 in which a plurality of signal wires 3 is collectively coated with sheaths 40, and a holding body 5 for holding the plurality of power supply wires 2 and the multicore electric wire 4. The plurality of power supply wires 2 and the plurality of signal wires 3 are formed by coating conductors 21 and 31 with insulators 22 and 32. As for the insulator 22 and sheath 40 of each of the plurality of power supply wires 2, at least outermost layers are formed of a polyurethane-based resin. The plurality of power supply wires 2 and the multicore electric wire 4 constitute a twisted body 10 while the wires are mutually twisted. A part of the twisted body 10 in a longitudinal direction is stored in the holding body 5. The length of a part where the twisted body 10 is stored in the holding body 5 is shorter than the length of a part where the plurality of power supply wires 2 and the multicore electric wire 4 are exposed, and the insulator 22 and the sheath 40 of each of the plurality of power supply wires 2 are brought into contact with each other in a part stored in the holding body 5.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a wire harness having a plurality of electric wires.

Background Art

[0002] Conventionally, a wire harness having a plurality of electric wires has been used, for example, in a vehicle. The cable assembly described in Patent Document 1 includes an electric parking brake cable having two electric wires for an electric parking brake and an electric parking brake jacket covering these two electric wires for an electric parking brake, two electric wires for a wheel speed sensor, and a wheel speed sensor cable having a wheel speed sensor jacket covering these two electric wires for a wheel speed sensor, and a grommet as a binding member for binding the electric parking brake cable and the wheel speed sensor cable. One ends of the two electric wires for an electric parking brake and the two electric wires for a wheel speed sensor are connected to a control device on the vehicle body side via connectors. The other ends of the two electric wires for an electric parking brake are connected to a brake device via connectors, and a wheel speed sensor is attached to the other ends of the two electric wires for a wheel speed sensor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, like the one described in Patent Document 1, a cable having a plurality of electric wires connecting the vehicle body side and the wheel side of a vehicle is bent and twisted in various directions by the movement of the wheel with respect to the vehicle body, so it is desirable to be thin and highly flexible. The present invention has been made in view of such circumstances, and an object thereof is to provide a wire harness that can be reduced in diameter and has excellent flexibility.

Means for Solving the Problems

[0005] An object of the present invention is to solve the above problems, and it provides a wire harness including a plurality of large-diameter electric wires, at least one multi-core electric wire in which a plurality of small-diameter electric wires having an outer diameter smaller than that of the plurality of large-diameter electric wires are collectively covered by a sheath, and a holder for holding the plurality of large-diameter electric wires and the at least one multi-core electric wire. The plurality of large-diameter electric wires and the plurality of small-diameter electric wires are formed by covering a conductor with an insulator. The plurality of large-diameter electric wires and the at least one multi-core electric wire are twisted together to form a twisted body. A part of the twisted body in the longitudinal direction is accommodated in the holder, and the plurality of large-diameter electric wires and the at least one multi-core electric wire are exposed at a portion not accommodated in the holder. The length of the portion where the twisted body is accommodated in the holder is shorter than the length of the portion where the plurality of large-diameter electric wires and the at least one multi-core electric wire are exposed. The insulators and the sheath of each of the plurality of large-diameter electric wires are in contact with each other at the portion accommodated in the holder.

Advantages of the Invention

[0006] According to the present invention, it is possible to provide a wire harness that can be miniaturized and has excellent flexibility.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0008] [First Embodiment] FIG. 1 is a configuration diagram showing a wire harness 1 according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the wire harness 1 taken along line A-A in FIG. 1. The wire harness 1 is mounted on a vehicle and laid between the vehicle body side and the wheel side. Hereinafter, the configuration of the wire harness 1 will be described in detail.

[0009] The wire harness 1 includes a plurality of power lines 2, a multi-core wire 4 in which a plurality of signal lines 3 are covered by a sheath 40, a plurality of holders 5 that hold the plurality of power lines 2 and the multi-core wire 4, a collective connector 61 provided at the end on the vehicle body side of the plurality of power lines 2 and the multi-core wire 4, a power line connector 62 provided at the end on the wheel side of the plurality of power lines 2, a sensor head 63 provided at the end on the wheel side of the multi-core wire 4, and a grommet 64.

[0010] The collective connector 61 is connected to a control device 71 disposed on the vehicle body side. Note that the connection between the collective connector 61 and the control device 71 may be relayed by a relay cable. The power line connector 62 is connected to an electric brake device 72. The plurality of power lines 2 supply operating power to the electric brake device 72 via the power line connector 62. The brake device 72 is, for example, an electric parking brake device that locks the rotation of the wheels when the vehicle stops, but is not limited thereto, and may be an electric brake device (electric servo brake device) that brakes the wheels when the vehicle is running. The brake device 72 has a pair of pads 721 and generates a frictional force by pressing the pair of pads 721 against a brake disk 81 during operation.

[0011] The sensor head 63 has a physical quantity sensor 631 for detecting a physical quantity and a molded body 632 made of a molding resin that covers the physical quantity sensor 631 and the end of the sheath 40. As the molding resin, for example, polyamide (PA), polybutylene terephthalate (PBT), etc. can be preferably used. The plurality of signal lines 3 are led out from the sheath 40 inside the molded body 632 and are connected to the physical quantity sensor 631. In the present embodiment, the physical quantity sensor 631 is a magnetic field sensor that detects the direction and intensity of a magnetic field, and detects the magnetic field of a disk-shaped magnetic encoder 82 that rotates integrally with the wheel. The control device 71 can obtain the rotational speed of the wheel based on the detection signal of the physical quantity sensor 631 transmitted through the plurality of signal lines 3.

[0012] The grommet 64 is made of a rubber material such as EPDM (ethylene propylene diene rubber), etc., and is attached to the tire house cover 83. The plurality of power lines 2 and the multi-core wire 4 are inserted through the grommet 64. The grommet 64 suppresses the intrusion of foreign matters such as dust and moisture from the tire house cover 83 toward the vehicle body side. The grommet 64 is a cylindrical member, and the plurality of power lines 2 and the multi-core wire 4 are in contact with the inner peripheral surface of the grommet 64.

[0013] In the present embodiment, the wire harness 1 has two power lines 2 and one multi-core wire 4. The two power lines 2 and the one multi-core wire 4 are twisted together to form a twisted body 10. However, the number of the power lines 2 and the multi-core wire 4 is not limited to this, and the number of the power lines 2 may be three or more, and the number of the multi-core wire 4 may be two or more. In FIG. 2, the twisting direction of the two power lines 2 and the one multi-core wire 4 is indicated by an arrow A 10 as shown.

[0014] FIG. 3(a) is a cross-sectional view of the power line 2. The power line 2 is an insulated wire in which a conductor 21 is covered with an insulator 22. The conductor 21 is a stranded wire formed by twisting a plurality of strands 211 made of a highly conductive metal such as copper. In the present embodiment, the conductor 21 is composed of seven twisted strands 211. In FIG. 2, the twisting direction of the plurality of strands 211 in the power line 2 is indicated by an arrow A 21 as shown. In FIG. 3(a), the outer diameter of the power line 2, the conductor diameter of the conductor 21, and the thickness of the insulator 22 are respectively D 2 , D 21 , T 22 as shown. The outer diameter D 2 of the power line 2 is, for example, 4.0 mm. The conductor diameter D 21 of the conductor 21 is, for example, 2.1 mm. The thickness T 22 of the insulator 22 is, for example, 0.95 mm.

[0015] FIG. 3(b) is a cross-sectional view of the multi-core wire 4. In the present embodiment, the multi-core wire 4 has two signal lines 3, and the two signal lines 3 are collectively covered by a sheath 40. The two signal lines 3 are twisted together inside the sheath 40. In FIG. 1, a part of the twisted body 10 is enlarged and shown as an ejection part. In this ejection part, the contour of the sheath 40 is indicated by a virtual line (two-dot chain line), and the two signal lines 3 are indicated by solid lines. The sheath 40 enters the valleys formed by the contact of the two signal lines 3, and the multi-core wire 4 is a so-called solid-structured wire.

[0016] The signal line 3 is an insulated wire in which a conductor 31 is covered with an insulator 32. The conductor 31 is a stranded wire formed by twisting a plurality of strands 311 made of a highly conductive metal such as copper. In the present embodiment, the conductor 31 is composed of 40 twisted strands 311. In FIG. 2, the twisting direction of the two signal lines 3 in the multi-core wire 4 is indicated by an arrow A 4 as shown, and the twisting direction of the plurality of strands 311 in the signal line 3 is indicated by an arrow A 31 as shown.

[0017] In Fig. 3(b), the outer diameter of the multi-core wire 4, the outer diameter of the signal wire 3, the conductor diameter of the conductor 31, and the thickness of the insulator 32 are represented by D 4 , D 3 , D 31 , T 32 , respectively. The outer diameter D 4 of the multi-core wire 4 is, for example, 4.0 mm. The outer diameter D 3 of the signal wire 3 is, for example, 1.4 mm. The conductor diameter D 31 of the conductor 31 is, for example, 0.7 mm. The thickness T 32 of the insulator 32 is, for example, 0.35 mm. Also, the thickness T 40 of the thinnest part 400 of the sheath 40 in the radial direction of the multi-core wire 4 is thinner than the thickness T 22 of the insulator 22 and is, for example, 0.6 mm. The width W of the two signal wires 3 in the arrangement direction of the two signal wires 3 is larger than the conductor diameter D 21 of the conductor 21 and is, for example, 2.8 mm.

[0018] The outer diameter D 3 of the signal wire 3 is formed to be smaller than the outer diameter D 2 of the power supply wire 2. The power supply wire 2 corresponds to the large-diameter wire of the present invention, and the signal wire 3 corresponds to the small-diameter wire of the present invention. The outer diameter D 2 of each of the plurality of power supply wires 2 and the outer diameter D 4 of the multi-core wire 4 are of the same degree. More specifically, the outer diameter D 4 of the multi-core wire 4 is 95% or more and 105% or less of the outer diameter D 2 of the power supply wire 2. The fact that the thickness T 40 of the thinnest part 400 of the sheath 40 is thinner than the thickness T 22 of the insulator 22 contributes to making the outer diameter D 2 of the power supply wire 2 and the outer diameter D 4 of the multi-core wire 4 of the same degree.

[0019] The insulator 22 of each of the plurality of power lines 2 and the sheath 40 of the multi-core wire 4 are each composed of at least a polyurethane-based resin for the outermost layer. This makes it possible to suppress damage to the plurality of power lines 2 and the multi-core wire 4 caused by flying stones or the like. The polyurethane-based resin is a resin obtained by polymerizing a hydroxyl group component and an isocyanate compound. In the present embodiment, the entire insulator 22 of the power line 2 and the sheath 40 of the multi-core wire 4 are made of a polyurethane-based resin. However, the present invention is not limited to this. As long as the outermost layers of the insulator 22 and the sheath 40 are made of a polyurethane-based resin, either one or both of the insulator 22 and the sheath 40 may have a multi-layer structure in which a plurality of resin layers are laminated. For example, if the insulator 22 of the power line 2 has a two-layer structure having an inner layer made of polyethylene and an outer layer made of a polyurethane-based resin, the high electrical insulation of the polyethylene can enhance the insulation of the power line 2. In this case, from the viewpoint of insulation, the thickness of the inner layer made of polyethylene is preferably greater than the thickness of the outer layer made of the polyurethane-based resin. In the present embodiment, high electrical insulation means high volume resistivity. The inner layer may be made of a material other than polyethylene (for example, polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), etc.) as long as its volume resistivity is higher than that of the polyurethane-based resin.

[0020] The outer peripheral surface 22a of the insulator 22 of each of the plurality of power lines 2 and the outer peripheral surface 40a of the sheath 40 of the multi-core wire 4 have a surface roughness Ra (arithmetic mean roughness defined in JIS B0601 (2013)) of 1 μm or more. This surface roughness can be achieved by setting conditions such as the extrusion temperature when forming the insulator 22 and the sheath 40. Also, after forming the insulator 22 and the sheath 40, the surface roughness Ra of the outer peripheral surfaces 22a and 40a may be set to 1 μm or more by chemical or mechanical treatment. A more preferable range of the surface roughness Ra of the outer peripheral surface 22a of the insulator 22 of each of the plurality of power lines 2 and the outer peripheral surface 40a of the sheath 40 of the multi-core wire 4 is 4 μm or more and 15 μm or less.

[0021] The holding body 5 has a clamping member 51 for clamping the twisted body 10. The clamping member 51 is made of, for example, metal and is wound around the outer periphery of the twisted body 10. Further, the clamping member 51 has a surrounding portion 511 curved so as to surround the twisted body 10 and a fixing portion 512 for fixing to the object to be attached. As shown in FIG. 2, the shape of the clamping member 51 in a cross section perpendicular to the longitudinal direction of the twisted body 10 is such that the surrounding portion 511 is arc-shaped and the fixing portion 512 is flat-plate-shaped. The clamping member 51 is formed, for example, by plastically deforming a part of a flat-plate-shaped metal plate, and this curved portion serves as the surrounding portion 511. A through hole 510 for inserting a fixture such as a bolt for fixing the holding body 5 is formed in the fixing portion 512.

[0022] In the present embodiment, the holding body 5 has a cylindrical resin tube 52, and the resin tube 52 surrounds the twisted body 10 inside the surrounding portion 511 of the clamping member 51. The clamping member 51 clamps the resin tube 52 toward the twisted body 10. The clamping force by which the clamping member 51 clamps the resin tube 52 is, for example, 10 N or more. The twisted body 10 is clamped by the clamping member 51 via the resin tube 52, and the plurality of power lines 2 and the multi-core electric wire 4 are pressed so as to contact each other. The clamping member 51 is in contact with the resin tube 52. The resin tube 52 is in contact with the plurality of electric wires 2 and the multi-core electric wire 4. The length of the resin tube 52 is longer than the width of the clamping member 51, and in FIG. 1, the resin tube 52 protrudes from both sides of the clamping member 451.

[0023] The resin tube 52 is made of, for example, a polyurethane-based resin similar to the insulators 22 of the plurality of power lines 2 and the sheath 40 of the multi-core wire 4, or a rubber material such as EPDM (ethylene propylene rubber). The surface roughness Ra of the inner peripheral surface 52a of the resin tube 52 is 1 μm or more. The surface roughness Ra of the inner peripheral surface 52a of the resin tube 52 can be increased, for example, by roughening the surface of the mold for molding the resin tube 52. The desirable range of the surface roughness Ra of the inner peripheral surface 52a of the resin tube 52 is 1 μm or more and 30 μm or less, and a more desirable range is 4 μm or more and 15 μm or less. By increasing the surface roughness of the inner peripheral surface 52a of the resin tube 52, it becomes possible to suppress the displacement of the plurality of power lines 2 and the multi-core wire 4 with respect to the resin tube 52 due to the anchor effect.

[0024] The insulators 22 of the plurality of power lines 2 and the sheath 40 of the multi-core wire 4 are in contact with each other at the portion accommodated in the holder 5. In FIG. 2, the contact portion 101 between the insulator 22 of one power line 2 and the insulator 22 of the other power line 2, the contact portion 102 between the insulator 22 of one power line 2 and the sheath 40 of the multi-core wire 4, and the contact portion 103 between the insulator 22 of the other power line 2 and the sheath 40 of the multi-core wire 4 are each shown surrounded by a broken line.

[0025] A part of the stranded body 10 in the longitudinal direction is accommodated in the holder 5. The stranded body 10 is not covered with an outer skin such as a sheath in the portion not accommodated in the holder 5, and the plurality of power lines 2 and the multi-core wire 4 are exposed. That is, inside the tire house cover 83, except for the portion where the stranded body 10 is accommodated in the holder 5, the plurality of power lines 2 and the multi-core wire 4 are exposed in a state of being twisted together.

[0026] In the longitudinal direction of the twisted body 10, the length of the portion where the twisted body 10 is accommodated in the holding body 5 is shorter than the length of the portion where the plurality of power lines 2 and the multi-core electric wire 4 are exposed. That is, the length of the portion where the twisted body 10 is accommodated in the holding body 5 is less than half of the total length of the twisted body 10. Here, the total length of the twisted body 10 refers to the length between one end of any of the plurality of power lines 2 and the multi-core electric wire 4 that is at the longest distance from the holding body 5 on one side of the holding body 5 in the longitudinal direction of the twisted body 10 and the other end of any of the plurality of power lines 2 and the multi-core electric wire 4 that is at the longest distance from the holding body 5 on the other side of the holding body 5 in the longitudinal direction of the twisted body 10. In the present embodiment, the wire harness 1 has a plurality of holding bodies 5, but since the plurality of power lines 2 and the multi-core electric wire 4 are twisted between these holding bodies 5, the total length of the twisted body 10 is the same regardless of which holding body 5 is used as a reference.

[0027] In the example shown in FIG. 1, since the multi-core electric wire 4 is longer than the power line 2, the length L from the bulk connector 61 to the sensor head 63 1 becomes the total length of the twisted body 10. Let the length of the portion where the twisted body 10 is accommodated in the holding body 5 be L 2 . Then, L 2 is less than 50% of L 1 . L 1 is, for example, 1.0 m or more and 1.5 m or less, and L 2 is, for example, 2 cm or more and 3 cm or less. In the present embodiment, L 2 is the length of the resin tube 52 in the longitudinal direction of the twisted body 10.

[0028] In this embodiment, the twisted body 10 is held at two positions in the longitudinal direction by two holders 5. These holders 5 are fixed to the members 86 and 87 to be attached by bolts 84 and 85 as fixing tools. The members 86 and 87 to be attached are so-called spring lower members such as components of a suspension device (suspension arm, knuckle arm, link, strut, etc.) or a hub unit. Among the two holders 5, the member 86 to which the holder 5 closer to the wheel is attached is a member (for example, a knuckle arm or a hub unit) whose relative position with the brake device 72 does not change even when the wheel moves relative to the vehicle body. The member 87 to which the other holder 5 is attached is a member whose amount of movement relative to the vehicle body is smaller than that of the brake device 72 when the wheel moves relative to the vehicle body, for example. However, not limited to this, the members 86 and 87 to be attached may have the same amount of movement relative to the vehicle body when the wheel moves relative to the vehicle body.

[0029] Note that the number of holders 5 included in the wire harness 1 is not limited to two, and may be one or three or more. Also, in this embodiment, the twisted body 10 is held by the holders 5 at two positions on the wheel side of the grommet 64 attached to the tire house cover 83. However, on the vehicle body side of the grommet 64, the twisted body 10 may be held by the holders 5 at one or a plurality of positions. Furthermore, on the vehicle body side of the grommet 64, the plurality of power supply lines 2 and the multi-core electric wire 4 may not be twisted together. That is, it is sufficient that the twisted body 10 has the plurality of power supply lines 2 and the multi-core electric wire 4 twisted together at least in a part on the wheel side.

[0030] In the twisted body 10, at least in the portion held by the holder 5, two power lines 2 and the multi-core wire 4 are twisted together, and the twist between the power line 2 and the multi-core wire 4 is released on the terminal side (wheel side) rather than the portion housed in the holder 5. A plurality of power lines 2 and multi-core wires 4 on the terminal side rather than the holder 5 have remaining twist at least at the end on the holder 5 side. When the twisted body 10 is held by a plurality of holders 5 as in the present embodiment, the twist between the plurality of power lines 2 and the multi-core wire 4 is released on the terminal side rather than the holder 5 on the wheel side among the plurality of holders 5, and as shown in FIG. 1, the length L 4 In the range of, the twist between the plurality of power lines 2 and the multi-core wire 4 remains. That is, the twist between the plurality of power lines 2 and the multi-core wire 4 remains between the position where the twist between the plurality of power lines 2 and the multi-core wire 4 is released (the plurality of power lines 2 and the multi-core wire 4 are branched) and the holder 5 on the wheel side among the plurality of holders 5. Thereby, for example, when the plurality of power lines 2 or multi-core wires 4 have to be branched at a sharp angle, deformation of the end portion of the resin tube 52 (on the side where the plurality of power lines 2 and the multi-core wire 4 are branched) is suppressed.

[0031] (Effect of the First Embodiment) According to the first embodiment described above, since the twisted body 10 is housed in the holder 5 in a part in the longitudinal direction and the plurality of power lines 2 and multi-core wires 4 are exposed in other parts, for example, compared with the case where the plurality of power lines 2 and multi-core wires 4 are covered with an outer skin such as a sheath, the plurality of power lines 2 and multi-core wires 4 can be made thinner and the flexibility can be enhanced in the exposed portions.

[0032] Further, in the present embodiment, since the insulators 22 of the plurality of power lines 2 made of a polyurethane-based resin and the sheath 40 of the multi-core wire 4 are in contact with each other in the portion housed in the holder 5, displacement between the plurality of power lines 2 and the multi-core wire 4 is less likely to occur. As the polyurethane-based resin, it is particularly desirable to use a pressure-sensitive polyurethane in order to suppress the displacement between the plurality of power lines 2 and the multi-core wire 4 in the portion housed in the holder 5.

[0033] Further, in the present embodiment, since the surface roughness Ra of the outer peripheral surface 22a of each insulator 22 of the plurality of power lines 2 and the outer peripheral surface 40a of the sheath 40 of the multi-core wire 4 is 1 μm or more, the plurality of power lines 2 and the multi-core wire 4 are relatively slippery at the exposed portions, and the stranded body 10 bends flexibly according to the movement of the wheels with respect to the vehicle body during vehicle travel.

[0034] Also, in the present embodiment, the arrow A 10 The twisting direction of the two power lines 2 and the multi-core wire 4 indicated by and the arrow A 4 Since the twisting direction of the two signal lines 3 in the multi-core wire 4 indicated by is the same, even if the wheels move with respect to the vehicle body, the twist of the two power lines 2 and one multi-core wire 4 is difficult to loosen, and it is suppressed that the power line 2 or the multi-core wire 4 comes into contact with a component of the suspension device, for example. Furthermore, in the present embodiment, the twisting direction of the plurality of strands 211 in the power line 2 indicated by the arrow A 21 and the twisting direction of the plurality of strands 311 in the signal line 3 indicated by the arrow A 31 are the same direction (clockwise direction in FIG. 2) as the twisting direction of the two power lines 2 and the multi-core wire 4 and the twisting direction of the two signal lines 3 in the multi-core wire 4, so the effect of making the twist of the two power lines 2 and one multi-core wire 4 difficult to loosen is further enhanced.

[0035] Also, in the present embodiment, the outer diameter D of each of the plurality of power lines 2 2 and the outer diameter D of the multi-core wire 4 4 are about the same. Therefore, compared with the case where these outer diameters are greatly different, the tightening force of the tightening member 51 can be evenly applied to the plurality of power lines 2 and the multi-core wire 4, and the certainty of holding the stranded body 10 by the holder 5 can be enhanced.

[0036] In addition, in the present embodiment, since the resin tube 52 is interposed between the surrounding portion 511 of the fastening member 51 of the holder 5 and the twisted body 10, the two power lines 2 and the multi-core wire 4 are less likely to be displaced relative to the holder 5, and it is possible to suppress the two power lines 2 and the multi-core wire 4 from being damaged by contact with the fastening member 51.

[0037] Note that the resin tube 52 may have a shape in which a slit along the longitudinal direction of the resin tube 52 is formed at one location in the circumferential direction as long as it is cylindrical in a state where it is combined with the fastening member 51 and holds the twisted body 10. In this case, the slit can be widened to accommodate the twisted body 10 inside the resin tube 52, and the workability of assembling the holder 5 is improved.

[0038] [Second Embodiment] Next, the wire harness 1A according to the second embodiment of the present invention will be described with reference to FIG. 4. FIG. 4 is a cross-sectional view showing the holder 5A of the wire harness 1A according to the second embodiment and the twisted body 10 held by the holder 5A. The number and mounting position of the holders 5A in the wire harness 1A, and the holding length L of the twisted body 10 by the holders 5A 2 are the same as those of the first embodiment described with reference to FIG. 1, for example. The same applies to other embodiments described later.

[0039] In the first embodiment, the case where the holder 5 has the fastening member 51 and the resin tube 52 has been described. However, the holder 5A of the second embodiment has the same fastening member 51 as the holder 5 of the first embodiment, and has a resin molded body 53 instead of the resin tube 52. In the resin molded body 53, holding holes 531, 532, and 533 for holding the plurality of power lines 2 and the multi-core wire 4 are formed so as to penetrate the resin molded body 53 in the longitudinal direction of the twisted body 10. The fastening member 51 fastens the resin molded body 53 from the outer periphery toward the twisted body 10. The twisted body 10 is fastened to the fastening member 51 via the resin molded body 53.

[0040] The resin molded body 53 is made of a molded resin that is molded so as to be in close contact with the outer peripheral surfaces 22a of the insulators 22 of the plurality of power lines 2 and the outer peripheral surface 40a of the sheath 40 of the multi-core wire 4. As this molded resin, for example, a polyurethane-based resin can be used, but it is not limited thereto, and a rubber material such as EPDM may be used. The plurality of power lines 2 and the multi-core wire 4 are twisted at the portion held by the holder 5A. The surface roughness Ra of the outer peripheral surfaces 22a of the insulators 22 of the plurality of power lines 2 and the outer peripheral surface 40a of the sheath 40 of the multi-core wire 4 is the same as that in the first embodiment.

[0041] The tightening force with which the tightening member 51 tightens the resin molded body 53 is, for example, the same as that in the first embodiment. However, since the resin molded body 53 is in close contact with the outer peripheral surfaces 22a of the insulators 22 of the plurality of power lines 2 and the outer peripheral surface 40a of the sheath 40 of the multi-core wire 4, the plurality of power lines 2 and the multi-core wire 4 are less likely to be displaced with respect to the holder 5A. Therefore, the tightening force of the tightening member 51 may be smaller than that in the first embodiment. The tightening force of the tightening member 51 on the holder 5A is, for example, 10 N or more.

[0042] Also according to this second embodiment, the same effects as those of the first embodiment can be obtained. In addition, the holder 5A can more reliably hold the twisted body 10.

[0043] [Third Embodiment] Next, the wire harness 1B according to the third embodiment of the present invention will be described with reference to FIG. 5. FIG. 5 is a cross-sectional view showing the holder 5B of the wire harness 1B according to the third embodiment and the twisted body 10 held by the holder 5B.

[0044] In the third embodiment, the holder 5B is composed of a fastening member 54, does not have a member corresponding to the resin tube 52 or the resin molded body 53, and the twisted body 10 is directly fastened by the fastening member 54. Similar to the fastening member 51 of the first embodiment, the fastening member 54 integrally has a surrounding portion 541 curved so as to surround the twisted body 10 and a fixing portion 542 for fixing to an object to be attached, and a through hole 540 for inserting a fixture such as a bolt is formed in the fixing portion 542.

[0045] Also according to this third embodiment, by appropriately selecting the attachment position of the holder 5B to the vehicle, while suppressing the power supply line 2 and the multi-core wire 4 from being damaged due to contact with the fastening member 54, the twisted body 10 can be held by the fastening member 54. In the third embodiment as well, between the position where the twisting of the plurality of power supply lines 2 and the multi-core wire 4 is released (the plurality of power supply lines 2 and the multi-core wire 4 are branched), and the holder 5B closest to the wheel side, the twisting of the plurality of power supply lines 2 and the multi-core wire 4 remains. Thereby, for example, when the plurality of power supply lines 2 or the multi-core wire 4 have to be branched at a sharp angle, it is possible to suppress the plurality of wires 2 and the multi-core wire 4 from being damaged at the end of the holder 5B (on the side where the plurality of power supply lines 2 and the multi-core wire 4 are branched).

[0046] [Fourth Embodiment] Next, the wire harness 1C according to the fourth embodiment of the present invention will be described with reference to FIG. 6. FIG. 6 is a cross-sectional view showing the holder 5C of the wire harness 1C according to the fourth embodiment and the twisted body 11 held by the holder 5C.

[0047] The twisted body 11 of the fourth embodiment has a multi-core wire 9 configured in the same manner as the multi-core wire 4 in addition to the two power supply lines 2 and one multi-core wire 4 in the twisted body 10 of the first to third embodiments. The two power supply lines 2 and the multi-core wires 4 and 9 are twisted together in the direction indicated by the arrow A in FIG. 6 to form the twisted body 11. The twisted body 11 is held by the holder 5C at one or a plurality of locations in the longitudinal direction. 11 and constitute the twisted body 11. The twisted body 11 is held by the holder 5C at one or a plurality of locations in the longitudinal direction.

[0048] The multi-core wire 9 has two insulated wires 91 as the small-diameter wires of the present invention and a sheath 90 that collectively covers the two insulated wires 91. In the insulated wire 91, a conductor 911 is covered with an insulator 912. The conductor 911 is a stranded wire formed by twisting a plurality of strands 910 made of a highly conductive metal such as copper. The dimensions, materials of the sheath 90 and the two insulated wires 91 in the multi-core wire 9, and the surface roughness of the outer peripheral surface 90a of the sheath 90 are the same as those of the sheath 40 of the multi-core wire 4 and the two signal wires 3, the materials, and the surface roughness of the outer peripheral surface 40a of the sheath 40 described in the first embodiment. Arrow A 9 In the multi-core wire 9 indicated by the arrow A 91 In the insulated wire 91 indicated by the arrow A 4 In the multi-core wire 4 indicated by the arrow A 31 the twisting direction of the plurality of strands 311 in the signal wire 3 indicated by the arrow A is the same as the twisting direction of the two power supply lines 2 and the multi-core wires 4 and 9.

[0049] The insulated wire 91 is used, for example, as a power supply line or a signal line for an electronic component such as a sensor that detects the state of a wheel. Examples of such a sensor include a pneumatic pressure sensor for detecting the pneumatic pressure of a tire and an acceleration sensor for controlling a damping force variable damper. Further, the insulated wire 91 may be used for controlling a brake device 72 to which an operating power supply is supplied by the power supply line 2, and the multi-core wire 9 may be connected in parallel with the multi-core wire 4 to a physical quantity sensor 631 and used for redundancy of the multi-core wire 4.

[0050] The holder 5C has a fastening member 55 and a cylindrical resin tube 56. The fastening member 55 has a surrounding portion 551 curved so as to surround the twisted body 11 and the resin tube 56, and a fixing portion 552 for fixing to an object to be attached. A through hole 550 for inserting a fixture such as a bolt is formed in the fixing portion 552. The materials of the fastening member 55 and the resin tube 56 are the same as those of the fastening member 51 and the resin tube 52 of the holder 5 described in the first embodiment.

[0051] The resin tube 56 has an inner peripheral surface 56a that contacts the two power lines 2 and the multi-core wires 4 and 9. The surface roughness Ra of the inner peripheral surface 56a of the resin tube 56 is 1 μm or more. The desirable range of the surface roughness Ra of the inner peripheral surface 56a of the resin tube 56 is 1 μm or more and 30 μm or less, and a more desirable range is 4 μm or more and 15 μm or less.

[0052] In the example shown in FIG. 6, at the portion where the stranded body 11 is held by the holder 5C, the two power lines 2 are in contact with each other, the multi-core wire 4 is in contact with the two power lines 2, and the multi-core wire 9 is in contact with the two power lines 2. In FIG. 6, the contact portion 101 between the insulator 22 of one power line 2 and the insulator 22 of the other power line 2, the contact portions 102 and 104 between the insulator 22 of one power line 2 and the sheaths 40 and 90 of the multi-core wires 4 and 9, and the contact portions 103 and 105 between the insulator 22 of the other power line 2 and the sheaths 40 and 90 of the multi-core wires 4 and 9 are each shown surrounded by a broken line.

[0053] However, not limited to this, the multi-core wires 4 and 9 may be brought into contact with each other, and the two power lines 2 may be brought into contact with the multi-core wires 4 and 9, respectively. In the first embodiment, the cross-sectional shape of the resin tube 52 was circular, but in this embodiment, the cross-sectional shape of the resin tube 56 is elliptical, and the cross-sectional shape of the surrounding portion 551 of the fastening member 55 is also elliptical corresponding to the shape of the resin tube 56.

[0054] The stranding of the plurality of power lines 2 and the multi-core wires 4 and 9 is loosened on the terminal side of the stranded body 11 rather than the portion housed in the holder 5C, and the plurality of power lines 2 and the multi-core wires 4 and 9 on the terminal side of the holder 5C have stranding remaining at least at the end on the holder 5C side.

[0055] Also according to this fourth embodiment, the same effects as those of the first embodiment can be obtained. In the fourth embodiment, instead of the resin tube 56, a molded body made of a molded resin molded as in the second embodiment, for example, may be used. Further, for example, as in the third embodiment, the resin tube 56 may be omitted and the twisted body 11 may be directly tightened by the tightening member 55.

[0056] (Summary of Embodiments) Next, the technical idea grasped from the embodiments described above will be described by referring to the reference numerals and the like in the embodiments. However, each reference numeral in the following description is not limited to the member or the like that specifically shows the component in the claims in the embodiments.

[0057] [1] A wire harness (1, 1A, 1B, 1C) comprising: a plurality of large-diameter electric wires (power supply wires 2); at least one multi-core electric wire (4, 9) in which a plurality of small-diameter electric wires (signal wires 3, insulating electric wires 91) having an outer diameter smaller than that of the plurality of large-diameter electric wires (power supply wires 2) are collectively covered by a sheath (40, 90); and a holder (5, 5A, 5B, 5C) for holding the plurality of large-diameter electric wires (2) and the at least one multi-core electric wire (4, 9), wherein the plurality of large-diameter electric wires (2) and the plurality of small-diameter electric wires (3, 91) are formed by covering a conductor (31, 911) with an insulator (32, 912), the insulators (22) of the respective plurality of large-diameter electric wires (2) and the sheath (40, 90) are made of at least a polyurethane-based resin for the outermost layer, the plurality of large-diameter electric wires (2) and the at least one multi-core electric wire (4, 9) are twisted together to form a twisted body (10, 11), a part of the twisted body (10, 11) in the longitudinal direction is accommodated in the holder (5, 5A, 5B, 5C), the plurality of large-diameter electric wires (2) and the at least one multi-core electric wire (4, 9) are exposed in the part not accommodated in the holder (5, 5A, 5B, 5C), the length of the part where the twisted body (10, 11) is accommodated in the holder (5, 5A, 5B, 5C) is shorter than the length of the part where the plurality of large-diameter electric wires (2) and the at least one multi-core electric wire (4, 9) are exposed, and the insulators (22) of the respective plurality of large-diameter electric wires (2) and the sheath (40) are in contact with each other in the part accommodated in the holder (5, 5A, 5B, 5C).

[0058] [2] The wire harness (1, 1A, 1B, 1C) according to [1] above, wherein the surface roughness Ra of the outer peripheral surfaces (40a, 90a) of the insulators (22) of the respective plurality of large-diameter electric wires (2) and the sheath (40, 90) is 1 μm or more.

[0059] [3] In the at least one multi-core electric wire (4, 9), the plurality of small-diameter electric wires (3, 91) are twisted together inside the sheath (40, 90), and the twisting direction of the plurality of small-diameter electric wires (3, 91) is the same as the twisting direction of the plurality of large-diameter electric wires (2) and the at least one multi-core electric wire (4, 9) in the twisted body (10, 11). The wire harness (1, 1A, 1B, 1C) according to [1] above.

[0060] [4] The outer diameter of each of the plurality of large-diameter electric wires (2) is approximately the same as the outer diameter of the at least one multi-core electric wire (4, 9). The wire harness (1, 1A, 1B, 1C) according to [1] above.

[0061] [5] The holding body (5, 5A, 5B, 5C) has a tightening member (51, 54, 55) for tightening the twisted body. The wire harness (1, 1A, 1B, 1C) according to any one of [1] to [3] above.

[0062] [6] The holding body (5, 5C) has a resin tube (52, 56) surrounding the twisted body (10, 11) and a tightening member (51, 55) for tightening the resin tube (52, 56). The wire harness (1, 1C) according to any one of [1] to [3] above.

[0063] [7] The holding body (5A) has a resin molded body (53) in which holding holes (531, 532, 533) for holding the plurality of large-diameter electric wires (2) and the at least one multi-core electric wire (4) respectively penetrate, and a tightening member (51) for tightening the resin molded body (53). The wire harness (1B) according to any one of [1] to [3] above.

[0064] [8] The twisted bodies (10, 11) are untwisted between the plurality of large-diameter electric wires (2) and the at least one multi-core electric wire (4, 9) on the terminal side rather than the portion accommodated in the holding bodies (5, 5A, 5B, 5C), and the plurality of large-diameter electric wires (2) and the at least one multi-core electric wire (4, 9) on the terminal side rather than the holding bodies (5, 5A, 5B, 5C) have remaining twists at least at the ends on the holding body (5, 5A, 5B, 5C) side. The wire harness (1) according to any one of [1] to [3] above.

[0065] As described above, the embodiments of the present invention have been described. However, the above embodiments do not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments are essential means for solving the problems of the invention.

[0066] Further, the present invention can be appropriately modified and implemented without departing from its gist. For example, in the above first embodiment, the case where the holding body 5 is fixed to the attachment target members 86, 87 has been described. However, the present invention is not limited to this, and the holding body may simply hold the plurality of power supply wires 2 and the multi-core electric wire 4. Further, in the first embodiment, the case where the plurality of power supply wires 2 supply operating power to the electric brake device 72 and the plurality of signal wires 3 transmit the detection signal of the physical quantity sensor 631 functioning as a wheel speed sensor has been described. However, the uses of the large-diameter electric wire and the small-diameter electric wire of the present invention are not limited to this. For example, the large-diameter electric wire of the present invention may be used for power supply to devices other than the brake device 72, or the small-diameter electric wire of the present invention may be used for transmitting a signal for controlling the electric brake device 72, for example. It may also be used as a power supply wire or a signal wire for electronic components such as sensors other than the wheel speed sensor. The insulators 22 of each of the plurality of power supply wires 2 and the sheath 40 of the multi-core electric wire 4 may be made of rubber such as at least the outermost layer being EPDM (ethylene propylene diene rubber), butyl rubber, butadiene rubber, or silicone rubber.

Explanation of Reference Numerals

[0067] 1, 1A, 1B, 1C… wire harnesses 10, 11… twisted bodies 2… power supply line (large-diameter wire) 21… conductor 22… insulator 22a… outer peripheral surface 3… signal line (small-diameter wire) 31… conductor 32… insulator 4… multi-core wire 40… sheath 40a… outer peripheral surface 5, 5A, 5B, 5C… holders 51, 54, 55… fastening members 52… resin tube 52a… inner peripheral surface 53… resin molded body 531, 532, 533… holding holes 56… resin tube 56a… inner peripheral surface 9… multi-core wire 90… sheath 91… insulated wire (small-diameter wire) 911… conductor 912… insulator

Claims

1. A wire harness comprising: a plurality of large-diameter electric wires; at least one multi-core electric wire in which a plurality of small-diameter electric wires having an outer diameter smaller than that of the plurality of large-diameter electric wires are collectively covered by a sheath; and a holder for holding the plurality of large-diameter electric wires and the at least one multi-core electric wire, wherein the plurality of large-diameter electric wires and the plurality of small-diameter electric wires are formed by covering a conductor with an insulator, the plurality of large-diameter electric wires and the at least one multi-core electric wire are twisted together to form a twisted body, a part of the twisted body in the longitudinal direction is accommodated in the holder, and the plurality of large-diameter electric wires and the at least one multi-core electric wire are exposed at a portion not accommodated in the holder, the length of the portion of the twisted body accommodated in the holder is shorter than the length of the portion where the plurality of large-diameter electric wires and the at least one multi-core electric wire are exposed, the insulators and the sheath of each of the plurality of large-diameter electric wires are in contact with each other at the portion accommodated in the holder, a wire harness.

2. The surface roughness Ra of the outer peripheral surfaces of the insulators and the sheath of each of the plurality of large-diameter electric wires is 1 μm or more, The wire harness according to claim 1.

3. the plurality of small-diameter electric wires in the at least one multi-core electric wire are twisted together inside the sheath, the twisting direction of the plurality of small-diameter electric wires is the same as the twisting direction of the plurality of large-diameter electric wires and the at least one multi-core electric wire in the twisted body, The wire harness according to claim 1.

4. the outer diameters of the plurality of large-diameter electric wires and the outer diameter of the at least one multi-core electric wire are of the same degree, The wire harness according to claim 1.

5. the holder has a tightening member for tightening the twisted body, The wire harness according to any one of claims 1 to 3.

6. the holder has a resin tube surrounding the twisted body and a tightening member for tightening the resin tube, The wire harness according to any one of claims 1 to 3.

7. the holder has a resin molded body in which holding holes for holding the plurality of large-diameter electric wires and the at least one multi-core electric wire are formed therethrough, and a tightening member for tightening the resin molded body, The wire harness according to any one of claims 1 to 3.

8. The twisted body has the twisting between the plurality of large-diameter electric wires and the at least one multi-core electric wire released on the terminal side rather than the portion accommodated in the holding body. The plurality of large-diameter electric wires and the at least one multi-core electric wire on the terminal side rather than the holding body have the twisting remaining at least at the end on the holding body side. The wire harness according to any one of claims 1 to 3.

9. At least the outermost layer of the insulator and the sheath of each of the plurality of large-diameter electric wires is made of a polyurethane-based resin. The wire harness according to any one of claims 1 to 3.

Images