阅读说明：本技术 外装构件及线束 (Exterior member and wire harness ) 是由 齐藤靖幸 于 2020-01-20 设计创作，主要内容包括：保护管(40)具有收纳电线(20)的收纳部(41)。保护管(40)具有：突出部(55),形成于收纳部(41)的内周面,从收纳部(41)的内周面朝向收纳部(41)的内侧突出地形成；和辐射膜(70),将突出部(55)的表面包覆,具有比突出部(55)的表面高的辐射率。(The protective tube (40) has a housing section (41) for housing the electric wire (20). The protection tube (40) has: a protruding portion (55) formed on the inner peripheral surface of the housing portion (41) and protruding from the inner peripheral surface of the housing portion (41) toward the inside of the housing portion (41); and a radiation film (70) that covers the surface of the protruding section (55) and has a higher emissivity than the surface of the protruding section (55).)

1. An exterior member having a housing portion that houses a wire, the exterior member comprising:

a 1 st protruding portion formed on an inner peripheral surface of the housing portion and protruding from the inner peripheral surface of the housing portion toward an inner side of the housing portion; and

and an irradiation film covering the surface of the 1 st protruding part and having a higher emissivity than the surface of the 1 st protruding part.

2. The exterior member according to claim 1, further comprising a 2 nd protruding portion formed on an outer peripheral surface of the exterior member so as to protrude outward from the outer peripheral surface of the exterior member,

the 2 nd protruding portion is formed only on an outer peripheral surface of the outer covering member on a side opposite to the heat source with the receiving portion interposed therebetween.

3. The exterior member according to claim 1 or claim 2, wherein the exterior member has:

a housing having a groove for receiving the electric wire; and

a cover assembled to the housing to cover the groove portion,

the housing portion is constituted by the groove portion and the cover,

the 1 st projection is formed only on an inner side surface of the inner peripheral surface of the housing, the inner side surface being provided between a bottom wall of the housing and an opposing wall of the cover opposing the bottom wall.

4. The exterior member according to claim 3, wherein a pressing portion that presses the electric wire toward the other of the bottom wall of the case and the opposing wall of the cover is formed on one of the bottom wall of the case and the opposing wall of the cover.

5. The exterior member according to claim 3 or claim 4, wherein the radiation film is formed so as to entirely cover an inner circumferential surface of the groove portion.

6. The exterior member according to claim 3 or claim 4, wherein the radiation film is formed so as to cover only the inner side surface of the inner peripheral surface of the housing portion.

7. A wire harness has: the electric wire; and

the exterior member according to any one of claim 1 to claim 6.

8. The wire harness according to claim 7, wherein the electric wire has a core wire and an insulating coating portion coating an outer periphery of the core wire,

an irradiation film having a higher emissivity than an outer peripheral surface of the insulating coating portion is formed on the outer peripheral surface of the insulating coating portion.

Technical Field

The present disclosure relates to an exterior member and a wire harness.

Background

Conventionally, a wire harness used in a vehicle such as a hybrid vehicle or an electric vehicle includes an electric wire electrically connected between a high-voltage battery and an electric device such as an inverter (see, for example, patent documents 1 and 2). In this wire harness, a plurality of wires are covered with an exterior member such as a metal pipe or a resin pipe for the purpose of protecting the wires and preventing noise.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2005-44607

Patent document 2: japanese patent laid-open publication No. 2018-37260

Disclosure of Invention

Problems to be solved by the invention

However, in recent years, the current flowing through the electric wire inserted into the exterior member tends to increase in current, and the amount of heat generated from the electric wire also increases. Therefore, improvement of heat dissipation in a wire harness including an exterior member and wires is desired.

Therefore, an object is to provide an exterior member and a wire harness that can improve heat dissipation.

Means for solving the problems

According to the exterior member for solving the above problem, the exterior member has a housing portion for housing a wire, and the exterior member has: a 1 st protruding portion formed on an inner peripheral surface of the housing portion and protruding from the inner peripheral surface of the housing portion toward an inner side of the housing portion; and a radiation film covering the surface of the 1 st protruding part and having a higher emissivity than the surface of the 1 st protruding part.

Effects of the invention

According to the exterior member and the wire harness of the present disclosure, the heat dissipation performance can be improved.

Drawings

Fig. 1 is a schematic configuration diagram illustrating a wire harness according to an embodiment.

Fig. 2 is a schematic cross-sectional view illustrating a wire harness according to an embodiment.

Fig. 3 is a schematic cross-sectional view illustrating a wire harness according to an embodiment.

Fig. 4 is a schematic cross-sectional view illustrating a wire harness according to an embodiment.

Fig. 5 is a schematic cross-sectional view of a wire harness showing a modification.

Fig. 6 is a schematic cross-sectional view of a wire harness showing a modification.

Fig. 7 is a schematic cross-sectional view of a wire harness showing a modification.

Fig. 8 is a schematic cross-sectional view of a wire harness showing a modification.

Fig. 9 is a schematic cross-sectional view of a wire harness showing a modification.

Fig. 10 is a schematic cross-sectional view of a wire harness showing a modification.

Fig. 11 is a schematic cross-sectional view of a wire harness illustrating a modification.

Fig. 12 is a schematic cross-sectional view of a wire harness illustrating a modification.

Detailed Description

Specific examples of the exterior member and the wire harness according to the present disclosure will be described below with reference to the drawings. In the drawings, a part of the structure is sometimes enlarged or simplified for convenience of explanation. The dimensional ratios of the respective portions may be different in each drawing. The present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

The wire harness 10 shown in fig. 1 electrically connects two or more than three electrical devices (devices). The wire harness 10 electrically connects an inverter 11 provided at the front of a vehicle V such as a hybrid vehicle or an electric vehicle and a high-voltage battery 12 provided behind the vehicle V with respect to the inverter 11. The wire harness 10 is routed, for example, to pass under the floor of the vehicle V or the like. The inverter 11 is connected to a drive wheel motor (not shown) serving as a power source for running the vehicle. The inverter 11 generates alternating current from the direct current of the high-voltage battery 12 and supplies the alternating current to the motor. The high-voltage battery 12 is, for example, a battery capable of supplying a voltage of several hundred volts.

The wire harness 10 includes one or a plurality of (here, two) electric wires 20, a pair of connectors C1 attached to both end portions of the electric wires 20, and an exterior member 30 collectively surrounding the plurality of electric wires 20.

One end of each electric wire 20 is connected to the inverter 11 via a connector C1, and the other end of each electric wire 20 is connected to the high-voltage battery 12 via a connector C1. Each of the electric wires 20 is formed in a long shape so as to extend in the front-rear direction of the vehicle, for example. Each wire 20 is, for example, a high-voltage wire that can respond to high voltage and large current. Each of the electric wires 20 is, for example, a non-shielded electric wire having no electromagnetic shielding structure.

As shown in fig. 2, each of the electric wires 20 is a coated electric wire having a core wire 21 made of a conductor and an insulating coating 22 coating an outer periphery of the core wire 21. In the following description, the extending direction of the wires 20 is referred to as a longitudinal direction L, a direction in which the plurality of wires 20 are arranged in a direction orthogonal to the longitudinal direction L is referred to as a width direction W, and a direction orthogonal to both the longitudinal direction L and the width direction W is referred to as a height direction T.

As the core wire 21, for example, a stranded wire formed by twisting a plurality of metal wire rods, a columnar conductor formed by one metal rod having a columnar shape with a solid structure, a tubular conductor having a hollow structure, or the like can be used. Further, as the core wire 21, a twisted wire, a columnar conductor, and a cylindrical conductor may be used in combination. Examples of the columnar conductor include a single core wire and a reflow bar. As the material of the core wire 21, for example, a metal material such as copper-based or aluminum-based can be used. The core wire 21 is formed by extrusion molding, for example.

The cross-sectional shape of the core wire 21 cut along a plane orthogonal to the longitudinal direction L of the core wire 21 can be any shape. That is, the cross-sectional shape of the core wire 21 can be any shape. The cross-sectional shape of the core wire 21 is formed into, for example, a circular, semicircular, polygonal, square, flat shape. In the present specification, the flat shape means a shape having a short side or a short axis and a long side or a long axis and having an aspect ratio different from 1, and the "flat shape" includes, for example, a rectangle, an oval, an ellipse, and the like. In addition, "rectangle" in this specification has long sides and short sides, except for a square. In addition, "rectangular" in the present specification also includes a shape obtained by chamfering a ridge portion and a shape obtained by smoothing the ridge portion. The cross-sectional shape of the core wire 21 of the present embodiment is formed in a circular shape.

The insulating coating portion 22 coats the outer peripheral surface of the core wire 21 in a close contact state over the entire periphery, for example. The insulating coating 22 is made of an insulating material such as synthetic resin. The insulating coating 22 is formed by, for example, extrusion molding (extrusion coating) of the core wire 21.

The exterior member 30 shown in fig. 1 is, for example, a long tube shape long in the longitudinal direction L. A plurality of electric wires 20 are inserted into the internal space of the exterior member 30. The exterior member 30 is formed to surround the outer peripheries of the plurality of wires 20 over the entire periphery, for example. The exterior member 30 protects the electric wire 20 from, for example, flying objects and water droplets. As the exterior member 30, for example, a metal or resin pipe, a resin protector, a flexible bellows tube made of resin or the like, a rubber waterproof cover, or a combination thereof can be used. As a material of the metal pipe, a metal material such as copper, iron, aluminum, or the like can be used. As a material of the protector and the bellows made of resin, for example, a resin material having conductivity or a resin material having no conductivity can be used. As the resin material, for example, synthetic resins such as polyolefin, polyamide, polyester, and ABS resin can be used.

As shown in fig. 2 and 3, the exterior member 30 includes a protective tube 40 made of metal. The protection tube 40 has, for example, a plurality of (two in this case) cylindrical accommodation portions 41 for individually accommodating a plurality of (two in this case) electric wires 20 one by one. The housing 41 of the present embodiment is formed in a square tubular shape.

The protection tube 40 has: a housing 50 having a plurality of (here, two) groove portions 51 in a groove shape; and a cover 60 attached to the case 50 to cover the grooves 51. The protective tube 40 is configured by fitting the cover 60 to the case 50 so as to cover the groove portions 51. Each of the storage sections 41 is formed by each of the groove sections 51 and the cover 60 covering the groove section 51. In the protection tube 40 of the present embodiment, the case 50 and the cap 60 are formed as separate members. The case 50 and the cover 60 are each formed by, for example, extrusion molding. The housing 50 and the cover 60 are formed to have a cross-sectional shape that is constant over the entire length in the longitudinal direction L, for example.

As the material of the case 50 and the cover 60, for example, a metal material such as iron-based or aluminum-based material can be used. The material of the housing 50 and the material of the cover 60 may be the same material or different materials from each other. The protective tube 40 has a protective function of protecting the plurality of electric wires 20 from damage by flying objects and the like, an electromagnetic shielding function of protecting the plurality of electric wires 20 from damage by electromagnetic waves, and a heat radiation function of radiating heat generated by the electric wires 20 and the like.

Next, the structure of the case 50 will be described.

The housing 50 has: a bottom wall 52 extending along the longitudinal direction L; a pair of side walls 53 protruding from both ends of the bottom wall 52 in the width direction W toward the height direction T; and a partition wall 54 protruding from a central portion in the width direction W of the bottom wall 52 in the height direction T. The cross-sectional shape of the housing 50 is formed, for example, in an E-shape. The bottom wall 52 is formed in a long flat plate shape, for example, long in the longitudinal direction L. Each of the side walls 53 and the partition wall 54 is formed in a long flat plate shape, for example, long in the longitudinal direction L. The side walls 53 and the partition walls 54 extend over the entire length of the bottom wall 52 in the longitudinal direction L, for example. The side walls 53 and the partition walls 54 are erected on the upper surface of the bottom wall 52, for example. For example, each of the side walls 53 and the partition wall 54 is formed to vertically stand from the upper surface of the bottom wall 52. For example, the dimension in the height direction T of each side wall 53 and the dimension in the height direction T of the partition wall 54 are set to be substantially the same. Further, the dimension of the partition wall 54 in the height direction T may be set to be smaller than the dimension of the side wall 53 in the height direction T.

In the housing 50, each groove 51 is formed by a bottom wall 52, one side wall 53, and a partition wall 54. Specifically, the groove 51 is defined by a space defined by the upper surface of the bottom wall 52, the side surfaces of the side walls 53 and the side surfaces of the partition walls 54 facing each other in the width direction W. Each groove 51 is formed extending along the longitudinal direction L, for example, and is formed in an open manner upward in the figure. The two grooves 51 are arranged in the width direction W and are separated from each other by a partition wall 54. In other words, the two groove portions 51 share one partition wall 54. The grooves 51 accommodate the wires 20 individually. The width direction W and height direction T of the groove 51 are set to be larger than the outer diameter of the electric wire 20 having a circular cross section, for example.

In the following description, the upper surface of the bottom wall 52 constituting each groove 51 is referred to as a bottom surface 41A of the housing 41, the side surface of the side wall 53 constituting each groove 51 is referred to as an inner side surface 41B of the housing 41, and the side surface of the partition wall 54 constituting each groove 51 is referred to as an inner side surface 41C of the housing 41.

A plurality of (here, five) protruding portions 55 protruding toward the inside of the housing portion 41 are formed on each of the inner side surfaces 41B, 41C of the bottom surface 41A and the inner side surfaces 41B, 41C of the housing portion 41. Each protruding portion 55 is continuously and integrally formed with each inner side surface 41B, 41C. The plurality of projections 55 are arranged in line along the height direction T, for example. The plurality of projections 55 are provided at predetermined intervals in the height direction T, for example. Each protrusion 55 is formed to protrude in the width direction W, for example. For example, the protrusion 55 formed on the inner surface 41B and the protrusion 55 formed on the inner surface 41C face each other. Each protrusion 55 is formed to extend along the longitudinal direction L, for example. Each protrusion 55 extends, for example, over the entire length of the bottom wall 52 in the longitudinal direction L. The cross-sectional shape of each projection 55 can be any shape. The cross-sectional shape of each projection 55 may be, for example, semicircular, polygonal, or flat. Each of the projections 55 of the present embodiment is formed in a rectangular shape in cross section.

The inner surfaces 41B and 41C of the housing 41 are formed in a concave-convex shape by the formation of the protruding portion 55. On the other hand, no projection 55 is formed on the bottom surface 41A of the housing 41. Therefore, the bottom surface 41A of the housing portion 41 is formed as a flat surface.

As shown in fig. 2, a plurality of projections 56 projecting outward (downward in this case) are formed on the lower surface of the bottom wall 52 in the outer peripheral surface of the protective tube 40. The plurality of projections 56 are arranged in line in the width direction W, for example. The plurality of projections 56 are provided at predetermined intervals in the width direction W, for example. Each protrusion 56 is formed to protrude from the lower surface of the bottom wall 52 in a direction away from the housing portion 41. Each protrusion 56 is formed to protrude in the height direction T, for example. In the present embodiment, the projection 56 is formed on the outer peripheral surface farthest from the heat source 80, in this case, the lower surface of the bottom wall 52, of the outer peripheral surfaces of the protective tubes 40. In other words, in the protective tube 40, the protrusion 56 is formed on the lower surface of the bottom wall 52, which is the outer peripheral surface located on the opposite side of the heat source 80 with the housing 41 interposed therebetween. Each protrusion 56 is formed to protrude in a direction away from the heat source 80, for example. In the illustrated example, the protruding portion 56 is formed so as to protrude toward the ground G1.

Here, the heat source 80 may be, for example, an exhaust manifold of a vehicle. The heat source 80 may be, for example, a vehicle body made of a metal material that reflects heat.

The housing 50 of the present embodiment is a single member in which the bottom wall 52, the pair of side walls 53, the partition wall 54, the protruding portion 55, and the protruding portion 56 are integrally formed.

The radiation film 70 is formed on the inner peripheral surface of the groove 51, that is, the bottom surface 41A and the inner side surfaces 41B and 41C of the housing 41, and the radiation film 70 has a higher emissivity than those of the bottom surface 41A and the inner side surfaces 41B and 41C. The radiation film 70 covers the entire surface of the protruding portion 55 formed on the inner side surfaces 41B and 41C in an adhesive state. The radiation film 70 covers, for example, the entire bottom surface 41A and the entire inner surfaces 41B and 41C of the housing 41 in a close contact state. The radiation film 70 is formed uniformly and thinly, for example. The thickness of the radiation film 70 can be set to about 10 to 30 μm, for example. The radiation film 70 is formed, for example, in black or a color similar to black having a higher emissivity than the bottom surface 41A and the inner side surfaces 41B and 41C of the housing portion 41. The emissivity of the radiation film 70 can be set to 0.7 or more, for example.

Here, the metal (for example, aluminum) constituting the case 50 is generally excellent in thermal conductivity and is not excellent in emissivity (also referred to as emissivity) in many cases. For example, the emissivity of aluminum is 0.1 or less. Therefore, the radiation film 70 having a higher emissivity than the inner peripheral surface is formed on the inner peripheral surface of the groove portion 51. Thereby, heat conduction by radiation can be increased as compared with the case where the radiation film 70 is not formed.

At this time, according to the wien's displacement law, the peak value of the wavelength of light emitted from the object by thermal radiation is inversely proportional to the temperature of the object. In addition, the following materials are known: even if the material is the same, emissivity takes different values depending on the temperature (wavelength of light) of the object. In the present embodiment, since the wire harness 10 is mounted on the vehicle V (see fig. 1), the radiation film 70 preferably has a high emissivity with respect to a peak wavelength in a high temperature range generated in a use environment of the vehicle.

As the radiation film 70, for example, a coating film formed by a coating treatment of applying a paint having a higher emissivity than the inner peripheral surface of the groove portion 51 to the inner peripheral surface of the groove portion 51 can be used. Further, as the radiation film 70, for example, a plating film formed by plating the inner peripheral surface of the groove 51 can be used.

In the present embodiment, the radiation film 70 is not formed on the outer peripheral surface of the case 50. That is, in the case 50 of the present embodiment, the emissivity is different between the inner peripheral surface of the groove portion 51 (specifically, the radiation film 70 formed on the inner peripheral surface of the groove portion 51) and the outer peripheral surface of the case 50.

In the wire harness 10 of the present embodiment, the radiation film 71 similar to the radiation film 70 is formed on the outer peripheral surface of each wire 20. The radiation film 71 is formed so as to cover the outer peripheral surface of the insulating coating 22 of each wire 20. The radiation film 71 covers the outer peripheral surface of the insulating cover 22 in a close contact state, for example. The radiation film 71 covers the outer peripheral surface of the insulating cover 22 in a close contact state over the entire circumference in the circumferential direction. The radiation film 71 covers the outer peripheral surface of the insulating coating portion 22 in a close contact state over substantially the entire length in the longitudinal direction, for example. The emissivity of the radiation film 71 is set to be higher than the emissivity of the outer peripheral surface of the insulating coating portion 22. The radiation film 71 is formed, for example, in black or a color similar to black having a higher emissivity than the outer peripheral surface of the insulating cover 22. The emissivity of the radiation film 71 can be set to 0.7 or more, for example.

Next, the structure of the cover 60 will be described.

The cover 60 has: an opposing wall 61 extending along the longitudinal direction L and opposing the bottom wall 52 of the housing; a pair of side walls 63 protruding from both ends of the opposing wall 61 in the width direction W; and a plurality of pressing portions 64 protruding in the height direction T from the lower surface of the opposing wall 61 between the pair of side walls 63. The cross-sectional shape of the cover 60 is formed, for example, in a comb shape. The cover 60 of the present embodiment is a single member in which the opposing wall 61, the pair of side walls 63, and the pressing portion 64 are integrally formed.

The opposing wall 61 is formed in a long flat plate shape, for example, long in the longitudinal direction L. The opposing wall 61 is formed to collectively close the openings on the upper side of the plurality of grooves 51, for example. As shown in fig. 2, when the opening on the upper side of each groove 51 is closed by the opposing wall 61, the accommodating portion 41 is formed by each groove 51 and the opposing wall 61. Therefore, the lower surface of the opposing wall 61 constitutes a part of the inner peripheral surface of the housing portion 41.

Each side wall 63 is formed in a long flat plate shape, for example, long in the longitudinal direction L. Each side wall 63 extends, for example, over the entire length of the opposing wall 61 in the longitudinal direction L. Each side wall 63 stands on the lower surface of the opposing wall 61, for example. For example, each side wall 63 is formed to vertically stand from the lower surface of the opposing wall 61. The dimension of each side wall 63 in the height direction T is set smaller than the dimension of the side wall 53 of the housing 50 in the height direction T, for example.

Each pressing portion 64 is provided corresponding to each groove portion 51 of the housing 50. That is, the pressing portions 64 are provided between the side walls 53 and the partition wall 54. Each pressing portion 64 is formed to protrude from the lower surface of the opposing wall 61 toward the bottom wall 52 of the housing 50. Each pressing portion 64 is erected on, for example, the lower surface of the opposing wall 61. For example, each pressing portion 64 is formed to vertically stand from the lower surface of the opposing wall 61. The dimension of each pressing portion 64 in the height direction T is set smaller than the dimension of each side wall 63 in the height direction T, for example. Each pressing portion 64 is formed in a long columnar shape, for example, long in the longitudinal direction L. Each pressing portion 64 extends, for example, over the entire length of the opposing wall 61 in the longitudinal direction L. The cross-sectional shape of each pressing portion 64 can be any shape. The cross-sectional shape of each pressing portion 64 can be formed into, for example, a semicircular shape, a polygonal shape, or a flat shape. The cross-sectional shape of each pressing portion 64 of the present embodiment is formed in a rectangular shape. That is, each pressing portion 64 of the present embodiment is formed in a quadrangular prism shape.

In the present embodiment, the protrusion 55 is not formed on the lower surface of the opposing wall 61. The radiation film 70 is not formed on the lower surface of the opposing wall 61 and the surface of the pressing portion 64. Therefore, the emissivity of the inner peripheral surface of the groove 51 (specifically, the radiation film 70 formed on the inner peripheral surface of the groove 51) is different from the emissivity of the lower surface of the opposing wall 61 in the inner peripheral surface of the housing portion 41. This can provide directivity to heat conduction by radiation.

In the protective tube 40, when the cover 60 is attached to the housing 50, the openings above the two grooves 51 are collectively closed by the opposing walls 61 of the cover 60. Thus, the groove 51 and the opposing wall 61 form the housing 41, and the entire outer circumference of each electric wire 20 is surrounded by the housing 41. At this time, the pressing portions 64 press the wires 20 stored in the storage portions 41 toward the bottom wall 52. The electric wire 20 pressed by each pressing portion 64 contacts the bottom surface 41A of the housing portion 41. Specifically, the radiation film 71 covering the outer periphery of the electric wire 20 is in contact with the radiation film 70 covering the bottom surface 41A of the housing portion 41. In addition, in a state where the cover 60 is fitted to the housing 50, the upper surfaces of the side walls 53 of the housing 50 and the upper surface of the partition wall 54 contact the lower surface of the opposing wall 61. In a state where the cover 60 is attached to the housing 50, the side walls 63 of the cover 60 cover the side walls 53 of the housing 50 from the outside in the width direction W. At this time, each side wall 63 contacts, for example, the outer surface of the side wall 53 of the housing 50.

Examples of the method of fixing the cover 60 to the housing 50 include a method of vertically sandwiching the housing 50 and the cover 60 with a sandwiching member or the like, a method of winding a binding member or the like around the outer peripheries of the housing 50 and the cover 60, and a method of integrating the housing 50 and the cover 60 by welding or the like.

Next, the operation and effects of the present embodiment will be described.

(1) The protection tube 40 has: a protruding portion 55 formed on the inner peripheral surface of the housing portion 41 and protruding from the inner peripheral surface of the housing portion 41 toward the inside of the housing portion 41; and a radiation film 70 covering the surface of the protrusion 55 and having a higher emissivity than the surface of the protrusion 55.

According to this configuration, even when the emissivity of the inner peripheral surface of the housing portion 41 is low, the surface of the protruding portion 55, which is a part of the inner peripheral surface of the housing portion 41, is covered with the radiation film 70 having a high emissivity. Therefore, heat conduction by radiation can be increased as compared with the case where the radiation film 70 is not formed. Further, by forming the protruding portion 55 on the inner peripheral surface of the housing portion 41, the surface area of the inner peripheral surface of the housing portion 41 can be increased. The surface of the projection 55 is covered with a radiation film 70. This can further increase the heat conduction by radiation. Therefore, even if the inner peripheral surface of the housing portion 41 and the outer peripheral surface of the electric wire 20 are physically separated, heat can be efficiently transferred from the outer peripheral surface of the electric wire 20 to the housing portion 41, that is, the protective pipe 40 by radiation, and the heat dissipation performance in the wire harness 10 can be improved. As a result, since the temperature rise of the electric wire 20 can be suppressed to be low, the size of the core wire 21 of the electric wire 20 can be reduced or the thickness of the insulating coating 22 can be reduced.

(2) A protrusion 56 protruding outward from the outer peripheral surface of the protective tube 40 is formed only on the outer peripheral surface (here, the lower surface of the bottom wall 52) located on the opposite side of the heat source 80 across the receiving portion 41. According to this structure, the projection 56 is not formed entirely on the outer peripheral surface of the protection tube 40, but the projection 56 is formed locally on a part of the outer peripheral surface of the protection tube 40. Therefore, the surface area of the outer circumferential surface of the protection pipe 40 in the portion where the protrusion 56 is formed is larger than the surface area of the outer circumferential surface of the other portion. Therefore, heat transferred from the electric wire 20 and the like can be efficiently released from the protruding portion 56 to the atmosphere. By providing the projection 56 locally on a part of the outer peripheral surface of the protective tube 40 in this manner, directivity can be imparted to heat conduction by radiation. Here, since the protruding portion 56 is provided on the side opposite to the heat source 80, the thermal efficiency transmitted from the electric wire 20 and the like can be released to the atmosphere separated from the heat source 80 with good efficiency. For example, when the heat source 80 is a vehicle body, radiant heat from the outer peripheral surface of the protective pipe 40 is reflected by the metal surface of the vehicle body, and there is a possibility that the heat is trapped between the vehicle body and the protective pipe 40. In contrast, in the protection pipe 40 of the present embodiment, since the heat efficiency can be released to the atmosphere on the side opposite to the vehicle body as the heat source 80, the thermal congestion between the protection pipe 40 and the heat source 80 can be appropriately suppressed.

(3) The protective tube 40 is composed of a case 50 having a groove portion 51 and a cover 60 attached to the case 50 and covering the groove portion 51. The groove 51 of the case 50 and the cover 60 form the housing 41. The protruding portions 55 are formed only on the inner side surfaces 41B and 41C provided between the bottom wall 52 of the case 50 and the opposing wall 61 of the cover 60, out of the inner peripheral surface of the housing portion 41. With this configuration, the upper surface of the bottom wall 52 constituting the bottom surface 41A of the housing portion 41 can be formed as a flat surface. Thus, for example, when the electric wire 20 is pressed by the cover 60, the electric wire 20 can be appropriately brought into contact with the upper surface of the bottom wall 52. In this case, heat generated by the electric wire 20 can be efficiently conducted to the protective pipe 40, and the heat dissipation property in the wire harness 10 can be further improved.

(4) A pressing portion 64 for pressing the electric wire 20 toward the bottom wall 52 of the housing 50 is formed on the lower surface of the opposing wall 61 of the cover 60. According to this configuration, the electric wire 20 stored in the storage portion 41 is pressed toward the bottom wall 52 by the pressing portion 64. This allows the outer peripheral surface of the electric wire 20 to contact the upper surface of the bottom wall 52, that is, the bottom surface 41A of the housing 41, thereby increasing the degree of contact between the outer peripheral surface of the electric wire 20 and the inner peripheral surface of the housing 41. Therefore, heat generated by the electric wires 20 can be efficiently conducted to the protective tube 40, and the heat dissipation property of the wire harness 10 can be further improved.

(5) Further, since the housing 50 and the cover 60 are separately configured, the work of laying the electric wires 20 between the pressing portions 64 and the bottom wall 52 of the housing 50 is facilitated so that the electric wires 20 are pressed by the pressing portions 64. Since the pressing portions 64 are formed on the opposing walls 61 of the cover 60, when the cover 60 is attached to the housing 50 in which the electric wires 20 are accommodated in the grooves 51, the electric wires 20 are pressed toward the bottom wall 52 of the housing 50 by the pressing portions 64. This allows the cover 60 to be attached to the housing 50 and the wires 20 to be pressed by the pressing portions 64 at the same time.

(6) The radiation film 70 is formed so as to cover the entire inner peripheral surface of the groove 51. According to this configuration, the radiation film 70 can be easily formed by a painting process, a plating process, or the like, as compared with the case where the radiation film 70 is partially formed on the inner peripheral surface of the groove portion 51.

(7) A radiation film 71 is formed on the outer peripheral surface of the insulating coating 22 of the electric wire 20, and the radiation film 71 has a higher emissivity than the outer peripheral surface of the insulating coating 22. According to this structure, even when the emissivity of the outer peripheral surface of the insulating cover 22 is low, the outer peripheral surface of the insulating cover 22 is covered with the radiation film 71 having a high emissivity. Therefore, heat conduction by radiation can be increased as compared with the case where the radiation film 71 is not formed. Therefore, even if the inner peripheral surface of the housing portion 41 and the outer peripheral surface of the electric wire 20 are physically separated, heat can be efficiently transferred from the outer peripheral surface of the electric wire 20 to the housing portion 41, that is, the protective pipe 40 by radiation, and the heat dissipation performance in the wire harness 10 can be improved.

(other embodiments)

The above embodiment can be modified as follows. The above-described embodiments and the following modifications can be implemented in combination with each other within a range not technically contradictory.

In the above embodiment, the radiation film 70 is formed so as to cover the entire inner peripheral surface of each groove 51, but the formation region of the radiation film 70 is not particularly limited. That is, when the radiation film 70 is formed so as to cover the entire surface of the projection 55, the formation region thereof is not particularly limited.

For example, as shown in fig. 4, the radiation film 70 may be partially formed on the inner peripheral surface of the groove portion 51. For example, the radiation film 70 may be formed only on the inner peripheral surface of the groove 51, in which the inner peripheral surfaces 41B and 41C of the protruding portion 55 are formed. In this case, the radiation film 70 is formed to cover the entire inner surfaces 41B and 41C of the housing 41 and the entire surface of the protruding portion 55, for example. In other words, in the protection tube 40 of the present modification, the radiation film 70 is not formed on the bottom surface 41A of the inner peripheral surface of the housing portion 41.

As shown in fig. 5, a radiation film 72 similar to the radiation film 70 may be formed on the lower surface of the opposing wall 61 constituting the inner peripheral surface of the housing portion 41. The radiation film 72 is formed to cover the entire lower surface of the opposing wall 61, for example. The radiation film 72 is formed to cover the entire surface of the pressing portion 64, for example. The emissivity of the radiation film 72 is set higher than the emissivity of the lower surface of the opposing wall 61 and the surface of the pressing portion 64. The radiation film 72 is formed, for example, in black or a color similar to black having a higher emissivity than the lower surface of the opposing wall 61 and the surface of the pressing portion 64. The emissivity of the radiation film 72 can be set to 0.7 or more, for example.

As shown in fig. 6, the radiation film 70 may be formed also on the outer peripheral surface of the housing 50. The radiation film 70 of the present modification is formed so as to cover the entire outer peripheral surface of the housing 50. The radiation film 70 of the present modification is formed so as to cover the entire inner peripheral surface of each groove 51, the entire surface of the protrusion 55, the entire upper surface of the partition wall 54, the entire upper surfaces and the entire outer side surfaces of the side walls 53, the entire lower surface of the bottom wall 52, and the entire surface of the protrusion 56. That is, the radiation film 70 of the present modification is formed so as to cover the entire surface of the housing 50.

As shown in fig. 6, the radiation film 72 may be formed also on the outer peripheral surface of the cover 60. The radiation film 72 of the present modification is formed so as to cover the entire outer peripheral surface of the cover 60. The radiation film 72 of the present modification is formed so as to cover the entire lower surface of the facing wall 61, the entire surface of the pressing portion 64, the entire upper surface of the facing wall 61, the entire outer surface of the side wall 63, the entire lower surface of the side wall 63, and the entire inner surface of the side wall 63. That is, the radiation film 72 of the present modification is formed so as to cover the entire surface of the cover 60.

In the above embodiment, the pressing portion 64 is formed so as to extend over the entire length of the cover 60 in the longitudinal direction L, but the present invention is not limited thereto. The pressing portion 64 may be partially formed in the longitudinal direction L of the cover 60. For example, the pressing portion 64 may be formed by cutting and punching a part of the opposing wall 61 toward the bottom wall 52 side of the housing 50 by press working or the like.

In the above embodiment, the pressing portion 64 is formed on the opposing wall 61 of the cover 60, but the present invention is not limited thereto. For example, the pressing portion 64 may be formed on the bottom wall 52 of the housing 50. The pressing portion 64 may be formed on both the opposing wall 61 of the cover 60 and the bottom wall 52 of the housing 50.

In the above embodiment, a buffer member formed of an elastic material such as an elastic body or rubber may be provided between the electric wire 20 and the pressing portion 64. With this configuration, the outer peripheral surface of the electric wire 20 can be prevented from being damaged by the pressing portion 64.

As shown in fig. 7, the pressing portion 64 may be omitted.

In the above embodiment, the protruding portions 55 are formed on the inner surfaces 41B and 41C of the inner peripheral surface of the groove portion 51, but the present invention is not limited thereto. For example, the protrusion 55 may be formed only on the inner surface 41B of the inner peripheral surface of the groove 51. The protrusion 55 may be formed only on the inner surface 41C of the inner circumferential surface of the groove 51.

For example, as shown in fig. 7, the protrusion 55 may be formed only on the bottom surface 41A of the inner peripheral surface of the groove 51. In this case, the radiation film 70 is formed so as to cover the surface of the protruding portion 55 formed on the bottom surface 41A.

As shown in fig. 8, a protrusion 55 may be formed on the lower surface of the opposing wall 61 constituting the inner peripheral surface of the housing portion 41. In the present modification, the projecting portion 55 is formed on the lower surface of the opposing wall 61 and the bottom surface 41A of the housing portion 41 in the inner peripheral surface of the housing portion 41. In addition, the protrusion 55 formed on the bottom surface 41A of the housing 41 in the present modification may be omitted. That is, the protruding portion 55 may be formed only on the lower surface of the opposing wall 61 in the inner peripheral surface of the housing portion 41.

In the above embodiment, the protrusion 55 is formed so as to extend over the entire length of the protection tube 40 in the longitudinal direction L, but the present invention is not limited thereto. The projection 55 may be partially formed in the longitudinal direction L of the protective tube 40.

The number of the projections 55 is not particularly limited.

In the above embodiment, the projection 56 is formed only on the lower surface of the bottom wall 52 of the housing 50 in the outer peripheral surface of the protective tube 40, but the position where the projection 56 is formed is not particularly limited.

For example, as shown in fig. 8, the protrusion 56 may be formed on the upper surface of the opposing wall 61. The projection 56 formed on the lower surface of the bottom wall 52 in the present modification may be omitted. In addition, the protrusion 56 may be formed integrally over the outer circumferential surface of the protection pipe 40. However, it is preferable that the protruding portion 56 is not formed in a portion of the outer side surface of the side wall 53 of the housing 50 which is covered by the side wall 63 of the cover 60.

In the above embodiment, the protruding portion 56 is formed so as to extend over the entire length of the protection pipe 40 in the longitudinal direction L, but the present invention is not limited thereto. The projection 56 may be partially formed in the longitudinal direction L of the protective tube 40.

The number of the projections 56 is not particularly limited.

As shown in fig. 9, the protrusion 56 formed on the outer peripheral surface of the protective tube 40 may be omitted. The bottom surface of the bottom wall 52 in this case is formed as a flat surface, for example.

In the above embodiment, the protection pipe 40 is embodied to have the plurality of receiving portions 41 for individually receiving the plurality of electric wires 20 one by one, but the present invention is not limited to this.

For example, as shown in fig. 10, the protective tube 40A may be embodied to have a housing portion 42 that houses the plurality of electric wires 20 collectively. In the protection pipe 40A of the present modification, the partition wall 54 is omitted from the case 50 of the protection pipe 40 shown in fig. 2. In the protective tube 40A, the bottom wall 52 of the case 50 constitutes the bottom surface 42A of the housing portion 42, and the side wall 53 of the case 50 constitutes the inner surface 42B of the housing portion 42.

In the above embodiment, the case 50 and the cover 60 are configured as separate members, and the protective tube 40 is configured by fitting the cover 60 to the case 50, but is not limited thereto.

For example, as in the case of the protective tube 40B shown in fig. 11, the case 50 and the cap 60 may be integrally formed. The protection tube 40B is formed in a cylindrical shape having a housing portion 43 for housing the plurality of electric wires 20, for example. The protection tube 40B of the present modification is formed in a square tube shape having a housing portion 43 that houses the plurality of electric wires 20 collectively. In the protective tube 40B, the inner peripheral surface of the housing portion 43 is continuously formed integrally over the entire circumference in the circumferential direction. That is, in the protective tube 40B, the inner peripheral surface of the housing portion 43 is continuously formed over the entire circumferential direction without a seam. In this case, the protrusion 55 may be formed in a part of the inner peripheral surface of the housing 43, or the protrusion 55 may be formed entirely on the inner peripheral surface of the housing 43. In the example shown in fig. 11, the protruding portion 55 may be formed only in a part of the inner peripheral surface of the housing portion 43. The radiation film 70 may be formed on the entire inner circumferential surface of the housing portion 43, or the radiation film 70 may be formed only on a part of the inner circumferential surface of the housing portion 43. In the example shown in fig. 11, the radiation film 70 is formed so as to cover the entire inner circumferential surface of the housing portion 43.

In the above embodiment, each of the housing portions 41 is formed in a square tubular shape, but the invention is not limited to this. Each housing portion 41 may be formed in a cylindrical shape, a long cylindrical shape, or an elliptical cylindrical shape, for example.

For example, as shown in fig. 12, the protection tube 40C may be formed in a cylindrical shape. The protection tube 40C of the present modification is formed in a cylindrical shape having a housing portion 44 for housing the plurality of electric wires 20 collectively. In the protective tube 40C, the inner peripheral surface of the housing portion 44 is continuously formed integrally over the entire circumference in the circumferential direction. That is, in the protective tube 40C, the inner peripheral surface of the housing portion 44 is continuously formed over the entire circumferential direction without a seam. In this case, the protrusion 55 may be formed in a part of the inner peripheral surface of the housing 44, or the protrusion 55 may be formed entirely on the inner peripheral surface of the housing 44. In the example shown in fig. 12, a protrusion 55 is formed on the entire inner peripheral surface of the housing 44. The radiation film 70 may be formed on the entire inner circumferential surface of the housing portion 44, or the radiation film 70 may be formed only on a part of the inner circumferential surface of the housing portion 44. In the example shown in fig. 12, the radiation film 70 is formed so as to cover the entire inner peripheral surface of the housing portion 44.

In the above embodiment, the case 50 and the cover 60 are made of a metal material, but the invention is not limited thereto. For example, as the material of the case 50 and the cover 60, a resin material having conductivity or a resin material having no conductivity can be used. As the resin material, for example, synthetic resins such as polyolefin, polyamide, polyester, and ABS resin can be used.

In the above embodiment, the radiation film 71 formed on the outer periphery of the electric wire 20 may be omitted. In addition, the insulating coating 22 of the electric wire 20 may be omitted, and the radiation film 71 may be formed on the outer periphery of the core wire 21. The emissivity of the radiation film 71 in this case may be set to the emissivity of the high voltage core wire 21.

In the above embodiment, each electric wire 20 is embodied as a non-shielded electric wire, but each electric wire 20 may be embodied as a shielded electric wire having an electromagnetic shielding structure.

In the above embodiment, the number of the electric wires 20 inserted into the exterior member 30 is two, but the number of the electric wires 20 is not particularly limited, and may be changed according to the specification of the vehicle. For example, one, three or more wires may be inserted into the exterior member 30. For example, the electric wire inserted into the exterior member 30 may be configured by additionally providing a low-voltage electric wire for connecting the low-voltage battery to various low-voltage devices (e.g., a lamp, a car audio, etc.). Alternatively, only the low-voltage wire may be used.

The arrangement relationship between the inverter 11 and the high-voltage battery 12 in the vehicle V is not limited to the above embodiment, and may be appropriately changed according to the vehicle structure.

In the above embodiment, the inverter 11 and the high-voltage battery 12 are used as the electrical devices connected by the wire harness 10, but the present invention is not limited to this. For example, the present invention may be applied to a wire connecting the inverter 11 and a motor for driving wheels. That is, any configuration may be applied as long as it is electrically connected between the electrical devices mounted on the vehicle.

The mounting posture of the wire harness 10 is not limited to the posture in the above embodiment, and can be changed as appropriate.

The radiation films 70, 71, and 72 are in close contact with a base material (for example, a metal base material) of the exterior member 40, and may be referred to as emissivity improving films configured to increase emissivity of the exterior member 40 with respect to infrared rays (for example, near infrared rays and far infrared rays) of at least a predetermined wavelength.

In some mounting examples of the present disclosure, the emissivity of the radiation film may be set to 0.7 to 1.0.

In some mounting examples of the present disclosure, the exterior member 40 including the 1 st protruding portion 55 can be formed by a 1 st material, and the radiation film can be formed by a 2 nd material different from the 1 st material.

In some mounting examples of the present disclosure, the exterior member 40 including the 1 st protruding portion 55 may be formed by a 1 st metal base material (for example, aluminum, copper, iron, an alloy thereof) containing a 1 st metal element (for example, aluminum, copper, iron) as a main component, and the radiation film may be a coating film or a plating film containing a 2 nd metal element (for example, nickel, chromium, or the like) different from the 1 st metal element.

In several mounting examples of the present disclosure, the exterior member 40 and/or the 1 st protruding portion 55 may have a surface having the 1 st emissivity, and the radiation film may have: an inner surface that is in close contact with the surface of the exterior member 40 and/or the 1 st protruding portion 55 to form an interface with the surface; and an exposed outer surface having a 2 nd emissivity higher than the 1 st emissivity.

In some mounting examples of the present disclosure, the exterior member 40 including the 1 st protruding portion 55 can be formed by a metal base material (e.g., aluminum, copper, iron, an alloy of those), and the radiation film may be a nonmetal, for example, a heat-resistant material.

In some embodiments of the present disclosure, the radiation film may contain a pigment or a colorant.

Description of the reference numerals

10 harness

20 electric wire

21 core wire

22 insulating coating

30 outer sheathing member

40. 40A-40C protective tube (external component)

41-44 storage part

41A, 42A bottom surface

41B, 41C, 42B inner side surface

50 casing

51 groove part

52 bottom wall

53 side wall

54 partition wall

55 projection (1 st projection)

56 projection (2 nd projection)

60 cover

61 opposite wall

63 side wall

64 pressing part

70. 72 radiation film

71 radiation film

80 heat source