JP2017158381A - Wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire harness capable of suppressing heat influence on an electric wire.SOLUTION: A wire harness 10 is arranged in the vicinity of a heat source 90 and includes a tubular body 30 surrounding an electric wire 20; a heat shielding member 40 that covers a portion of the outer circumferential surface of the tubular body 30 which faces at least the heat source 90 and has a ventilation path 60 that penetrates in a direction parallel to an axial direction of the tubular body 30 between the ventilation path and the outer circumferential surface of the tubular body 30; and radiating fins 50 disposed inside the ventilation path 60.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wire harness.

  The wire harness disclosed in Patent Literature 1 is routed under the vehicle floor of an automobile and includes a plurality of electric wires and a corrugated tube that surrounds each electric wire. This type of wire harness may be routed near the exhaust manifold. Since the exhaust manifold can be a heat source at a high temperature, a heat shield is usually provided between the wire harness and the exhaust manifold so that the wire harness is not directly exposed to heat from the heat source.

JP 2010-47033 A

  By the way, for example, in the case of a wire harness routed under the floor of a vehicle, the periphery of the wire may be covered with a tubular body in order to protect the wire from a stepping stone or the like. If such a tube is provided near the heat source, the surface temperature of the tube is likely to rise. And since an electric wire contacts with the inner peripheral surface of a tubular body not a little, the heat of a tubular body is easy to be transmitted to an electric wire, and there exists a possibility that a thermal influence may be exerted on an electric wire.

  This invention is completed based on the above situations, Comprising: It aims at providing the wire harness which can suppress the thermal influence on an electric wire.

  The present invention is a wire harness that is routed near a heat source, and covers a tube body that surrounds an electric wire, and at least a portion of the outer peripheral surface of the tube body that faces the heat source, and an outer periphery of the tube body The heat-shielding member which has a ventilation path which penetrates in the direction parallel to the axial direction of the said tubular body between surfaces, and the heat radiation fin arrange | positioned inside the said ventilation path are characterized.

  According to the said structure, the heat from a heat source is thermally radiated by the air flow which passes a ventilation path via a radiation fin. As a result, it is possible to suppress the thermal influence on the electric wires in the tube.

It is a partially broken perspective view of the wire harness of Example 1 of the present invention. It is a partially broken front view of a wire harness. It is a partially broken front view which shows the process of attaching the thermal insulation member integrated with the radiation fin to a pipe body. It is FIG. 2 equivalent view of the wire harness of Example 2 of the present invention. It is a side view which shows the state which attached the radiation fin to the tubular body.

Preferred embodiments of the present invention are shown below.
It is preferable that the heat shield member has a cylindrical shape that covers the outer peripheral surface of the tubular body over the entire circumference, and the heat radiating fins are disposed over the entire circumference in the air passage. According to this, it is not necessary to distinguish the direction of the wire harness in the circumferential direction with respect to the heat source, and the wire harness can be easily attached to the wiring position. Moreover, since the surface area of a radiation fin can be increased, heat dissipation can be improved.

  The heat radiating fins may elastically contact the inner peripheral surface of the heat shield member and the outer peripheral surface of the tubular body. According to this, the heat shield member and the tube can be held in a state where the air passage is interposed between the heat radiating fins. As a result, a dedicated holding member becomes unnecessary, and the configuration can be simplified correspondingly.

  The heat radiating fins may be integrated with the heat shield member. According to this, compared with the case where a radiation fin and a heat shielding member are comprised separately, a number of parts can be reduced.

  The heat shield member may be formed of a pair of halves that can be opened and closed along the axial direction. According to this, for example, even after the pipe body is bent, the heat shield member can be attached to the pipe body so as to cover from the side, and the difficulty of attachment can be eliminated. .

  The heat radiating fin may be formed in a coil shape that circulates around the outer periphery of the tubular body, and is in contact with the inner peripheral surface of the heat shield member and the outer peripheral surface of the tubular body in a separable manner. According to this, a tubular body, a heat shield member, and a radiation fin can be suitably constituted according to a situation, and it excels in versatility.

<Example 1>
Embodiment 1 of the present invention will be described below with reference to FIGS. The wire harness 10 of the first embodiment has a portion that is routed under the floor of the vehicle and passes near a heat source 90 that generates high heat, such as an exhaust manifold of the vehicle.

  As shown in FIG. 1, the wire harness 10 includes one or a plurality of electric wires 20 (one in the case of illustration), a tubular body 30 surrounding the electric wires 20, and a heat shielding member that covers the outer periphery of the tubular body 30. 40 and a heat radiation fin 50 interposed between the tubular body 30 and the heat shield member 40. The heat shield member 40 and the heat radiating fins 50 are provided to prevent heat from the heat source 90 from being transmitted to the electric wire 20.

  The electric wire 20 includes a core wire 21 made of copper, aluminum, or the like, and a resin coating 22 made of an insulating resin that covers the outer periphery of the core wire 21.

  The tubular body 30 is made of a metal such as aluminum, iron, or stainless steel, and is formed in a circular tube shape that extends in the axial direction (length direction) as a whole. Moreover, although not shown in figure, the tubular body 30 is bent at an appropriate place in the length direction so as to follow the routing route. The electric wire 20 is housed and protected in the tubular body 30 and has a portion that is in contact with the inner peripheral surface of the tubular body 30 along the axial direction.

  The heat shield member 40 is disposed so as to cover a part of the outer peripheral surface of the tubular body 30 in the axial direction facing the heat source 90. The heat shielding member 40 is a metal cylindrical material having a good heat shielding property such as aluminum, and has an inner diameter larger than the outer diameter of the tube body 30. In this case, the heat shield member 40 covers a part of the outer periphery of the tubular body 30 in the axial direction over the entire circumference, and extends straight along the straight line portion of the tubular body 30 in the axial direction. .

  As shown in FIG. 3, the heat shield member 40 includes a pair of halves 41 that can be opened and closed along the axial direction. Both halves 41 have a semicircular cross section and are connected to each other via a hinge 43 along one side edge in the axial direction.

  The radiating fin 50 is a metal plate material with good heat dissipation, such as aluminum, and has a plate surface along a direction parallel to the axial direction (air flow direction). Further, the radiating fin 50 has a role as a holding means for holding the heat shield member 40 and the tube body 30 at a constant interval in the radial direction. A space between the heat shield member 40 and the tube body 30 is maintained at a substantially constant interval in the radial direction by the heat radiating fins 50 and penetrates in a direction parallel to the axial direction of the tube body 30 to both ends in the axial direction of the heat shield member 40. The air passage 60 is open to the outside.

  Specifically, the radiating fin 50 has a cross-sectional wave shape that alternately repeats the ridges 51 and the valleys 52 over the entire circumference of the air passage 60, and the apex of the valleys 52 is elastic to the outer circumferential surface of the tubular body 30. , And the apex of the peak portion 51 comes into elastic contact with the inner peripheral surface of the heat shield member 40. The apex of the peak portion 51 is joined to the inner peripheral surface of the heat shield member 40 via a brazing material or the like, whereby the radiating fins 50 are integrated with the heat shield member 40.

Next, the operation of the wire harness 10 of the first embodiment will be described.
When the heat shield member 40 is attached to the tube 30, as shown in FIG. 3, the two halves 41 in an open state are arranged facing the tube 30 from the side (radially outside), The radiating fins 50 along the inner peripheral surface of the half body 41 are directed toward the outer peripheral surface of the tube body 30. Subsequently, both halves 41 are closed in a closed state, the heat shield member 40 is formed in a cylindrical shape, and the valley 52 of the radiating fin 50 is in elastic contact with the outer peripheral surface of the tubular body 30. A ventilation path 60 is formed between the heat shield member 40 and the tubular body 30. In this case, the heat shield member 40 can be attached to the tube body 30 after bending.

  Thereafter, when the tubular body 30 is installed in the vehicle, the heat shield member 40 is disposed to face the heat source 90, and the ventilation path 60 extends in the front-rear direction of the vehicle and communicates with the outside air. In this state, when heat is released from the heat source 90, the released heat is transferred from the heat shield member 40 to the air flowing through the ventilation path 60 via the heat radiation fins 50 and is subjected to heat exchange. At this time, if the vehicle is in an operating state, the air flow in the ventilation path 60 becomes faster, and the efficiency of heat exchange is increased. Thereby, it will be in the state by which the tube 30 was substantially air-cooled, and it can suppress that the electric wire 20 in the tube 30 will be in a high temperature state.

  As described above, according to the first embodiment, the heat from the heat source 90 is radiated to the air flow passing through the ventilation path 60 via the radiation fins 50, so that the heat influence on the electric wires 20 in the tube body 30 is achieved. Can be suppressed.

  Further, since the heat shield member 40 has a cylindrical shape that covers the outer peripheral surface of the tubular body 30 over the entire periphery, and the heat radiating fins 50 are disposed over the entire periphery inside the air passage 60, the periphery of the wire harness 10 with respect to the heat source 90. There is no need to distinguish the direction of the direction, and the attachment of the wire harness 10 to the vehicle is facilitated. Moreover, since the surface area of the radiation fin 50 can be increased, heat dissipation can be improved.

  Furthermore, the heat-dissipating fin 50 elastically contacts the inner peripheral surface of the heat shield member 40 and the outer peripheral surface of the tube body 30, so that the heat shield member 40 and the tube body 30 sandwich the air passage 60 between the heat-radiating fins 50. Since it can be held in an interposed state, a dedicated holding member is not required, and the configuration can be simplified correspondingly. Moreover, since the radiating fins 50 are integrated with the heat shield member 40, the number of parts can be reduced as compared with the case where the radiating fins 50 and the heat shield member 40 are configured separately.

  Furthermore, since the heat shield member 40 is composed of a pair of halves 41 that can be opened and closed along the axial direction, for example, even after the tube body 30 is bent, the heat shield member is provided on the tube body 30. 40 can be attached so as to cover from the side, and the difficulty of attachment can be eliminated.

<Example 2>
4 and 5 show a wire harness 10A according to a second embodiment of the present invention. In the second embodiment, unlike the first embodiment, the heat shielding member 40A is integrally formed in the circumferential direction (cannot be opened and closed), and the heat radiating fin 50A is wound around the outer periphery of the tubular body 30 in a coil shape. In addition, the heat shielding member 40A, the heat radiation fin 50A, and the tube body 30 are each configured separately.

  The heat shielding member 40A has a cylindrical shape made of a metal having good heat shielding properties such as aluminum, and is arranged so as to cover a part of the outer circumferential surface of the tube body 30 in the axial direction facing the heat source 90 over the entire circumference. Is done.

  The heat dissipating fin 50A is a metal wire with good heat dissipation such as aluminum, and is wound around the outer periphery of the tubular body 30 in a spiral shape along the axial direction as a whole (see FIG. 5). The curled portions 55 are arranged in parallel in the circumferential direction (see FIG. 4). The curled portion 55 is arranged so as to alternately contact the outer peripheral surface of the tube body 30 and the inner peripheral surface of the heat shield member 40A in the circumferential direction and partition the air passage 60A between the tube body 30 and the heat shield member 40A. Is done.

  At the time of assembly, the radiating fin 50A is wound around the outer periphery of the tubular body 30 and held (see FIG. 5). In this case, the radiating fin 50 </ b> A is expanded in diameter from a natural state, and is in a state of elastically contacting the outer peripheral surface of the tubular body 30. Thereafter, the heat shield member 40 </ b> A is inserted into the outer periphery of the tubular body 30. When the heat shield member 40A reaches a position covering the heat radiating fin 50A, the curled portion 55 of the heat radiating fin 50A elastically contacts the inner peripheral surface of the heat shield member 40A and the outer peripheral surface of the tube body 30, and the air passage 60A It is formed so as to penetrate in the longitudinal direction of the vehicle.

  Even if the pipe body 30 is installed in the vehicle and the nearby heat source 90 is in a high temperature state, the heat from the heat source 90 is radiated from the heat radiation fins 50A to the ventilation path 60A, so that the electric wires 20 in the pipe body 30 are affected by heat. Is suppressed from reaching. In particular, since the surface area of the radiating fin 50A is increased by the curled portion 55, the radiating efficiency is improved.

  According to the second embodiment, the radiating fin 50A has a coil shape that circulates around the outer periphery of the tubular body 30, and the inner circumferential surface of the heat shield member 40A and the outer circumferential surface of the tubular body 30 are detachably contacted. The heat shielding member 40A and the heat radiation fin 50A can be appropriately configured according to the situation, and are excellent in versatility.

<Other embodiments>
Other embodiments will be briefly described below.
(1) The heat shielding member may be formed in a tunnel shape that covers only a part of the outer peripheral surface of the tubular body in the circumferential direction facing the heat source.
(2) The heat shield member may be configured to cover the outer peripheral surface of the tubular body over substantially the entire length.
(3) In addition to the heat dissipating fins, a dedicated holding member for connecting the heat shield member and the tube body is provided, and the interval between the heat shield member and the tube body is held by the holding member. Good.
(4) The tube may be a resin tube, or a composite tube in which a resin layer and a metal layer are laminated.

DESCRIPTION OF SYMBOLS 10, 10A ... Wire harness 20 ... Electric wire 30 ... Pipe body 40, 40A ... Heat-shielding member 41 ... Half body 50, 50A ... Radiation fin 60, 60A ... Airflow path 90 ... Heat source

Claims (6)

A wire harness routed near a heat source,
A tube surrounding the wire,
A heat shield member that covers at least a portion of the outer peripheral surface of the tubular body facing the heat source and has a ventilation passage extending between the outer circumferential surface of the tubular body and a direction parallel to the axial direction of the tubular body; ,
And a heat dissipating fin disposed inside the air passage.   2. The wire harness according to claim 1, wherein the heat shield member has a cylindrical shape covering the outer peripheral surface of the tubular body over the entire circumference, and the heat radiating fins are arranged over the entire circumference in the air passage. .   The wire harness according to claim 2, wherein the radiating fin elastically contacts an inner peripheral surface of the heat shield member and an outer peripheral surface of the tubular body.   The wire harness according to claim 2 or 3, wherein the radiating fin is integrated with the heat shield member.   The wire harness according to claim 4, wherein the heat shield member includes a pair of halves that can be opened and closed along an axial direction.   The said radiation fin comprises the coil shape which circulates the outer periphery of the said tubular body, and contact | connects the inner peripheral surface of the said heat-shielding member and the outer peripheral surface of the said tubular body so that isolation | separation is possible. Wire harness.

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