JP2014108722A - Wire harness system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire harness system in which temperature rising of an electric connection box is suppressed and the electric connection box can be downsized.SOLUTION: In a wire harness system 11 arranged in a vehicle 10, a box-side switching element 20 which performs electrification or power interruption to at least one of plural loads 14, 15 is arranged in an electric connection box 16 electrically connected to the wire harness 13, a switching unit 21 other than the electric connection box 16 is electrically connected to the wire harness 13, a unit-side switching element 22 which performs electrification or power interruption to at least one of the plural loads 14, 15 is arranged in the switching unit 21, and the switching unit 21 is attached directly or indirectly to a wire bundle 18 at a position other than the electric connection box 16.

Description

  The present invention relates to a wire harness system disposed in a vehicle.

  Conventionally, a wire harness that transmits electric power to a load is disposed in a vehicle. The wire harness is electrically connected to the electrical junction box. A switching element that energizes or interrupts the power to the load is housed inside the electrical junction box.

  When the load is energized or disconnected by the switching element, the switching element generates heat. Then, there is a concern that the heat generated from the switching element is trapped inside the electric junction box and the inside of the electric junction box becomes hot.

  Therefore, in the conventional electrical junction box, in order to dissipate heat generated from the switching element, for example, a heat radiating member may be provided. The thing of patent document 1 is known as an example of such an electrical junction box.

JP 2003-164040 A

  Recently, as the performance of a vehicle increases, the load disposed on the vehicle tends to increase. Then, the switching elements increase corresponding to these loads. Then, since the emitted-heat amount from a switching element also increases, it is desired to suppress the temperature rise inside an electrical junction box.

  Therefore, it is conceivable to increase the size of the heat dissipating member in order to suppress the temperature rise inside the electric junction box. However, this method causes a problem that the electrical junction box is enlarged.

  This invention was completed based on the above situations, and it aims at providing the wire harness system which can suppress the temperature rise of an electrical junction box and can miniaturize an electrical junction box. To do.

  The present invention is a wire harness system that includes a wire harness that is disposed in a vehicle and includes a wire bundle in which a plurality of wires are bundled, and a plurality of loads that are electrically connected to the wire harness. The electrical connection box electrically connected to the wire harness is provided with a box-side switching element for energizing or disconnecting at least one of the plurality of loads. A switching unit different from the electrical junction box is electrically connected, and the switching unit is provided with a unit-side switching element for energizing or disconnecting at least one of the plurality of loads. The switching unit is directly or indirectly attached to the wire bundle at a position different from the electrical junction box. To have.

  According to the present invention, the amount of heat generated in the electrical junction box can be reduced as compared with the case where all of the box side switching element and the unit side switching element are arranged in the electrical junction box. Thereby, the temperature rise of an electrical junction box can be suppressed. Moreover, since the structure for dissipating or cooling the heat generated in the electrical junction box can be simplified, the electrical junction box can be reduced in size.

  Moreover, since the switching unit is arranged at a position different from the electrical junction box, the influence of heat generated in the electrical junction box can be reduced. Moreover, heat dissipation can be improved compared with the case where the unit side switching element is distribute | arranged inside the electrical junction box. Thereby, the heat generated in the unit side switching element can be efficiently dissipated.

  As embodiments of the present invention, the following embodiments are preferable. It is preferable that a plurality of the switching units are distributed in the wire bundle.

  According to said aspect, each switching unit becomes difficult to receive the heat which generate | occur | produced in the other switching unit. Thereby, the heat generated in each switching unit can be efficiently dissipated.

  The unit-side switching element performs energization or disconnection on a high heat generation load having a relatively large calorific value among the plurality of loads, and the box-side switching element includes the plurality of loads. It is preferable that energization or disconnection is performed with respect to a low heat generation load having a relatively small calorific value.

  When a current is passed to a high heat generation load having a relatively large heat generation amount, the heat generation amount from the unit side switching element becomes relatively large. According to said embodiment, the switching unit provided with the unit side switching element is attached to an electric wire bundle directly or indirectly. As a result, the heat dissipation of the unit-side switching element can be improved as compared with the case where the unit-side switching element is accommodated inside the electrical junction box.

  In addition, since the amount of heat generated inside the electrical junction box can be reduced compared with the case where the unit side switching element is accommodated inside the electrical junction box, the temperature rise inside the electrical junction box can be suppressed. .

  Furthermore, since the heat dissipation structure for radiating the heat generated from the unit side switching element to the outside of the electrical junction box is not required, the electrical junction box can be further reduced in size.

  Further, since the box-side switching element housed in the electrical junction box has a relatively small amount of heat generation, the heat dissipation structure for radiating the heat generated from the box-side switching element to the outside of the electrical junction box is further downsized. be able to.

  With the above configuration, the wire harness system can be downsized as a whole.

  The rated current of the high heat generation load is preferably at least the largest of the plurality of loads connected to the same power supply system.

  When a current is passed through a load having the largest rated current among a plurality of loads, the amount of heat generated from the unit side switching element connected to the load is determined by the unit side switching element and the box side switching element provided in the vehicle. Is the largest. According to said aspect, compared with the case where the unit side switching element connected to the high heat load with which rated current becomes the maximum is accommodated in the inside of an electrical junction box, the temperature rise inside an electrical junction box is further suppressed. Can do.

  It is preferable that the electric wire is connected to the switching unit, and the switching unit is indirectly attached to the electric wire bundle via the electric wire.

  According to said aspect, a switching unit can be attached to an electric wire bundle using the electric wire connected to the switching unit. As a result, a special configuration for attaching the switching unit to the electric wire bundle is not required, and the wire harness system can be downsized as a whole. Moreover, since the wire bundle can be used as so-called heat sink, the heat dissipation of the switching unit can be improved.

  It is preferable that the switching unit is bound to the wire bundle by a binding member.

  According to the above aspect, since the switching unit is bound to the wire bundle, it does not protrude to the outside of the wire harness. As a result, the wire harness can be reduced in size.

  The switching unit is preferably fixed to the vehicle.

  According to the above aspect, the heat generated from the unit side switching element is transmitted to the vehicle. Thereby, since a vehicle can be utilized as what is called heat sink, the heat dissipation of a unit side switching element can be improved.

  It is preferable to have a protector surrounding the outer periphery of the wire harness, and the switching unit is fixed to the protector.

  According to the above aspect, the switching unit can be protected by the protector.

  The switching unit preferably includes an overcurrent protection unit. The unit-side switching element preferably includes an overcurrent protection unit.

  According to said aspect, it can suppress that an overcurrent flows into a wire harness system.

  Among the plurality of loads, the high heat generation load having a relatively large heat generation amount may be one or a plurality of loads selected from the group consisting of a defroster, a deisa, a PTC heater, a blower fan, and a seat heater.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing the temperature rise of an electrical junction box, an electrical junction box can be reduced in size.

FIG. 1 is a schematic view showing a state in which the wire harness system according to Embodiment 1 of the present invention is mounted on a vehicle. FIG. 2 is a schematic diagram showing a state in which the switching unit is attached to the wire harness. FIG. 3 is a perspective view showing the switching unit. FIG. 4 is an exploded perspective view showing the switching unit. FIG. 5 is a side view showing the connector housing and the circuit board. FIG. 6 is a bottom view showing the connector housing and the circuit board. FIG. 7 is a block diagram showing a wire harness system. FIG. 8 is a schematic diagram showing a state in which the switching unit is attached to the wire harness. FIG. 9 is a schematic view showing a state in which the switching unit is attached to the wire harness. FIG. 10 is a schematic view showing a state in which the switching unit is attached to the wire harness. FIG. 11 is a block diagram showing a wire harness system according to Embodiment 2 of the present invention.

<Embodiment 1>
A first embodiment in which the present invention is applied to a wire harness system 11 mounted on a vehicle 10 will be described with reference to FIGS. 1 to 10.

  As shown in FIG. 1, a vehicle 10 is provided with a power supply 12 and a plurality of loads 14 and 15 electrically connected to the power supply 12 via a wire harness 13. Among the plurality of loads 14 and 15, one having a relatively large heat generation amount is regarded as a high heat generation load 14, and one having a relatively small heat generation amount is regarded as a low heat generation load 15. An electrical connection box 16 is disposed between the power supply 12 and the low heat generation load 15.

(Wire harness 13)
As shown in FIG. 2, the wire harness 13 includes an electric wire bundle 18 in which a plurality of electric wires 17 are bundled. The wire bundle 18 is formed by winding a tape 19 (an example of a binding member) coated with an adhesive on one surface in a state where a plurality of wires 17 are bundled. The electric wire 17 is formed by coating the outer periphery of a core wire (not shown) with a synthetic resin insulating layer. The core wire is made of a conductive material such as metal or carbon nanotube. In the present embodiment, a stranded wire formed by twisting metal thin wires is used. As the metal used for the stranded wire, any metal such as copper, copper alloy, aluminum, aluminum alloy, iron, iron alloy, etc. can be appropriately selected as necessary. In this embodiment, copper or a copper alloy is used.

(Electric junction box 16)
As shown in FIG. 1, an electrical connection box 16 is electrically connected to the wire harness 13. The electrical connection box 16 houses a box-side switching element 20 that performs energization or disconnection of the low heat load 15. The box-side switching element 20 may be both or one of a semiconductor relay and a mechanical relay.

  As described above, the low heat generation load 15 according to the present embodiment has a relatively small heat generation amount. Examples of the low heat load 15 include a wiper motor, a headlight, a room light, a taillight 36, a cell motor, and a washer pump. The low heat generation load 15 is not limited to these, and can be appropriately selected as necessary.

  The electrical junction box 16 is provided with a fuse 39 disposed between the power source 12 and the high heat load 14 or the low heat load 15.

(Switching unit 21)
Further, as shown in FIG. 1, a switching unit 21 is electrically connected to the wire harness 13. The switching unit 21 is provided with a unit-side switching element 22 for energizing or disconnecting the high heat generating load 14. The unit side switching element 22 may be a semiconductor relay or a mechanical relay.

  The unit side switching element 22 accommodated in the switching unit 21 is connected to the high heat generating load 14 having the largest rated current among the loads 14 and 15 electrically connected to the same power supply system. . The unit-side switching element 22 accommodated in the switching unit 21 may be connected to the high heat generating load 14 having the second to third rated current.

  As described above, the high heat generation load 14 according to the present embodiment has a relatively large heat generation amount. Examples of the high heat generation load 14 include a seat heater 31, a deisa, a blower fan, a PTC heater, and a defroster 32. The high heat generation load 14 is not limited to these, and can be appropriately selected as necessary.

  As shown in FIGS. 3 and 4, the switching unit 21 includes a case 23, a circuit board 24 accommodated in the case 23, and a connector housing 25 electrically connected to the circuit board 24.

  The case 23 is made of a synthetic resin and has a bottomed cylindrical shape. In this embodiment, it has a substantially rectangular tube shape.

  The circuit board 24 is formed by forming a conductive path (not shown) on an insulating substrate by a printed wiring technique. The circuit board 24 includes a first surface 26 to which the connector housing 25 is attached and a second surface 27 on which the unit-side switching element 22 is mounted.

  The connector housing 25 is made of synthetic resin and includes a hood portion 28 that opens to the outside of the case 23. A plurality of metal terminals 29 having a rod shape are penetrated through the back wall of the hood portion 28. A terminal (not shown) attached to the end of the electric wire 17 is inserted into the hood portion 28. Thereby, the electric wire 17 is connected to the switching unit 21. One end portion of the terminal 29 is disposed inside the hood portion 28, and the other end portion of the terminal 29 penetrates the back wall and protrudes outside the connector housing 25, and then substantially toward the circuit board 24. It is bent at a right angle. The other end of the terminal 29 penetrates the circuit board 24 and is electrically connected to a conductive path formed on the circuit board 24 by a known method such as soldering (see FIG. 5).

  As shown in FIGS. 5 and 6, on the second surface 27 of the circuit board 24, the unit-side switching element 22 is electrically connected to a conductive path formed on the circuit board 24 by a known technique such as soldering. ing. In the present embodiment, two unit side switching elements 22 are arranged side by side on the second surface 27 of the circuit board 24. In addition, the unit side switching element 22 with which the switching unit 21 is provided may be one, and may be three or more.

(Wire harness system 11)
In FIG. 1, an example of the wire harness system 11 which concerns on this embodiment is shown typically. A power supply 12 is mounted in the engine room 30 of the vehicle 10. In the engine room 30, an electrical connection box 16 connected to the power source 12 via the electric wire 17 is mounted. A wire harness 13 is connected to the electrical junction box 16. The wire harness 13 is routed at an arbitrary position as necessary, such as under the floor of the vehicle 10 or in the pillar. In this embodiment, the wire harness 13 routed under the floor of the vehicle 10 will be described as an example in FIG. An electric wire 17 is branched from the wire harness 13. A high heat generation load 14 and a low heat generation load 15 are electrically connected to the end of the electric wire 17 branched from the wire harness 13.

  FIG. 1 shows a seat heater 31 and a defroster 32 as examples of the high heat generation load 14. The seat heater 31 is disposed on a seat 34 attached to the inside of a passenger compartment 33 on which the passenger is boarded. Further, the defroster 32 is disposed in the rear window 60 of the vehicle 10.

  The switching unit 21 including the unit-side switching element 22 for energizing or disconnecting the seat heater 31 is disposed in the vicinity of the branch portion 35 where the electric wire 17 is branched from the wire harness 13 to the seat heater 31. Yes. Similarly, the switching unit 21 including the unit-side switching element 22 for energizing or disconnecting the defroster 32 is disposed in the vicinity of the branch portion 35 where the electric wire 17 is branched from the wire harness 13 to the seat heater 31. Has been. The switching unit 21 is arranged at a position different from the electrical junction box 16 in the vehicle 10. Moreover, each switching unit 21 is distributed and arranged mutually.

  FIG. 1 shows a taillight 36 as an example of the low heat generation load 15. The box-side switching element 20 that performs energization or disconnection on the taillight 36 is accommodated in the electrical junction box 16.

  An instrument panel 37 is disposed in the passenger compartment 33. On the instrument panel 37, a manual switch 38 for instructing at least one of the high heat load 14 and the low heat load 15 to be energized or disconnected is disposed. The manual switch 38 is electrically connected to the unit side switching element 22 through the signal line 50. FIG. 1 illustrates a configuration in which a manual switch 38 that instructs energization or disconnection of the seat heater 31 is disposed on the instrument panel 37. In the present embodiment, the signal line 50 is routed from the instrument panel 37 under the floor and is bundled together with the plurality of electric wires 17 into the electric wire bundle 18. The signal line 50 may be configured to be routed to the vehicle 10 through a route different from the wire bundle 18 in which the wires 17 connected to the high heat load 14 and the low heat load 15 are bundled.

  FIG. 7 is a block diagram showing an outline of the wire harness system 11. The power supply 12 in this embodiment is a battery and an alternator. A part of the unit-side switching element 22 is instructed to be energized or de-energized by a manual switch 38 disposed on the instrument panel 37.

(Mounting structure of the switching unit 21)
The vehicle 10 is provided with a plurality of switching units 21. Below, the example of the attachment structure of the switching unit 21 to the vehicle 10 is shown. The mounting structure of the switching unit 21 is not limited to the following configuration.

  As shown in FIG. 2, the switching unit 21 is configured to be bundled together with the wire bundle 18 by a tape 19 that binds the wire bundle 18. In other words, the switching unit 21 is directly fixed to the wire bundle 18 by winding the tape 19 around the wire bundle 18. The switching unit 21 may be configured to be exposed from the tape 19, or may be configured to be integrally bundled with the wire bundle 18 by the tape 19 and embedded in the wound tape 19.

  In the switching unit 21 according to FIG. 2, the wire bundle 18 including the branch wire 17 </ b> A connected to the high heat load 14 is attached in the vicinity of the branch portion 35 that branches from the wire harness 13.

  Further, as shown in FIG. 8, the electric wires 17 led out from the switching unit 21 are bound to the electric wire bundle 18 by the tape 19, and the switching unit 21 is indirectly attached to the electric wire bundle 18 through the electric wires 17. It has been configured. In this way, when attaching to a portion where vibration is relatively small, the bundling work with the tape 19 is not required, so that the work efficiency is improved.

  As shown in FIG. 9, the switching unit 21 may be indirectly attached to the wire bundle 18 via the electric wire 17 and may be further fixed to the vehicle 10 with a bolt 41. The switching unit 21 may be directly attached to the vehicle body of the vehicle 10. Moreover, it is good also as a structure by which an attachment member is arrange | positioned in the vehicle 10 and the switching unit 21 is attached to this attachment member.

  Further, as shown in FIG. 10, a protector 40 surrounding the outer periphery of the wire harness 13 may be provided, and the switching unit 21 may be fixed to the protector 40 by a known method such as bolting or adhesive. . For the protector 40, any material such as a synthetic resin or a metal can be appropriately selected as necessary.

  Moreover, as shown in FIG. 1, it is good also as a structure which arrange | positions the switching unit 21 inside the compartment 33. FIG. In the present embodiment, a switching unit 21 having a unit-side switching element 22 for energizing or disconnecting the seat heater 31 is attached below a seat 34 disposed in a passenger compartment 33. The switching unit 21 can be disposed at any position in the passenger compartment 33.

(Operation and effect of this embodiment)
Then, the effect | action and effect of this embodiment are demonstrated. According to this embodiment, compared with the case where all of the box side switching element 20 and the unit side switching element 22 are arranged in the electric junction box 16, the amount of heat generated in the electric junction box 16 can be reduced. Thereby, the temperature rise of the electrical junction box 16 can be suppressed. Moreover, since the structure for dissipating or cooling the heat generated in the electrical junction box 16 can be simplified, the electrical junction box 16 can be reduced in size.

  In addition, since the switching unit 21 is disposed at a position different from the electrical junction box 16, the influence of heat generated in the electrical junction box 16 can be reduced. Moreover, heat dissipation can be improved compared with the case where the unit side switching element 22 is distribute | arranged inside the electrical junction box 16. FIG. Thereby, the heat generated in the unit-side switching element 22 can be efficiently dissipated.

  Further, according to the present embodiment, the plurality of switching units 21 are distributed and arranged in the wire bundle 18. Thereby, each switching unit 21 becomes difficult to receive the heat which generate | occur | produced in the other switching unit 21. FIG. Thereby, the heat generated in each switching unit 21 can be efficiently dissipated.

  Further, according to the present embodiment, the unit-side switching element 22 performs energization or power interruption with respect to the high heat generation load 14, and the box side switching element 20 energizes with respect to the low heat generation load 15. A power failure is performed.

  When a current is passed to the high heat generating load 14 having a relatively large heat generation amount, the heat generation amount from the unit side switching element 22 becomes relatively large. According to this embodiment, the switching unit 21 including the unit-side switching element 22 is directly or indirectly attached to the wire bundle 18. As a result, the heat dissipation of the unit side switching element 22 can be improved as compared with the case where the unit side switching element 22 is accommodated in the electrical junction box 16.

  In addition, since the amount of heat generated inside the electrical junction box 16 can be reduced compared to the case where the unit side switching element 22 is accommodated inside the electrical junction box 16, the temperature rise inside the electrical junction box 16 is suppressed. can do.

  In addition, the electrical connection box 16 can be reduced in size as compared with the case where both the unit-side switching element 22 and the box-side switching element 20 are accommodated in the electrical connection box 16.

  Furthermore, since the heat dissipation structure for dissipating the heat generated from the unit side switching element 22 to the outside of the electrical junction box 16 is not required, the electrical junction box 16 can be further reduced in size.

  Further, since the box-side switching element 20 accommodated in the electric connection box 16 has a relatively small amount of heat generation, a heat dissipation structure for radiating the heat generated from the box-side switching element 20 to the outside of the electric connection box 16 is provided. It can be downsized.

  With the above configuration, the wire harness system 11 can be downsized as a whole.

  Further, the rated current of the high heat generating load 14 electrically connected to the switching unit 21 is at least the largest among the plurality of loads 14 and 15 connected to the same power supply system. When a current is passed through the high heat generating load 14 having the largest rated current among the plurality of loads 14 and 15, the amount of heat generated from the unit side switching element 22 connected to the high heat generating load 14 becomes large. According to this embodiment, compared with the case where the unit side switching element 22 connected to the high heat generating load 14 having the maximum rated current is accommodated inside the electrical junction box 16, the temperature inside the electrical junction box 16 is increased. Further suppression can be achieved.

  Furthermore, according to the present embodiment, the box-side switching element 20 is accommodated in the electrical junction box 16. Thereby, about the circuit board (not shown) accommodated in the electrical connection box 16, it is not necessary to use a circuit board excellent in heat dissipation, such as a metal core wiring board or a thick film board. Manufacturing cost can be reduced.

  Further, according to the present embodiment, the switching unit 21 is bound to the wire bundle 18 by the tape 19 that bundles the plurality of wires 17. Thereby, since the switching unit 21 is bound to the wire bundle 18, the switching unit 21 does not protrude to the outside of the wire harness 13. As a result, the wire harness 13 can be reduced in size. Furthermore, since the wire bundle 18 can be used as so-called heat sinking, the heat dissipation of the switching unit 21 can be improved.

  Further, according to the present embodiment, the electric wire 17 is connected to the switching unit 21, and the switching unit 21 is indirectly attached to the electric wire bundle 18 through the electric wire 17. Thereby, the switching unit 21 can be attached to the wire bundle 18 using the electric wire 17 connected to the switching unit 21. As a result, a special configuration for attaching the switching unit 21 to the wire bundle 18 becomes unnecessary, and thus the wire harness system 11 can be downsized as a whole.

  Moreover, according to this embodiment, the protector 40 surrounding the outer periphery of the wire harness 13 is arranged, and the switching unit 21 is fixed to the protector 40. Thereby, the switching unit 21 can be protected by the protector 40.

  Further, according to the present embodiment, the switching unit 21 is fixed to the vehicle 10. Thereby, the heat generated from the unit side switching element 22 is transmitted to the vehicle 10. As a result, since the vehicle 10 can be used as so-called heat sink, the heat dissipation of the unit side switching element 22 can be improved.

  In the configuration in which the box-side switching element 20 is accommodated in the electric connection box 16, the electric wire 17 extending from the branch portion 35 to the electric connection box 16 and the box-side switching element 20 are connected inside the electric connection, The electric wire 17 which returns from the connection box 16 to the branch part 35 is needed. For this reason, there was a concern that the wire harness 13 would increase in size. Therefore, in the present embodiment, the branch wire 17A connected to the high heat load 14 is branched from the wire harness 13, and the switching unit 21 is located near the branch portion 35 where the branch wire 17A branches from the wire harness 13. It is attached. Thereby, compared with a prior art, the electric wire 17 extended from the branch part 35 to the electrical junction box 16 is omissible. As a result, the wire harness system 11 can be reduced in size.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. The switching unit 21 according to the present embodiment is provided with an overcurrent protection unit 51. Thereby, the fuse 39 can be omitted between the unit side switching element 22 and the power source 12. Thereby, the electrical junction box 16 can be further reduced in size.

  The overcurrent protection unit 51 suppresses an overcurrent from flowing through the high heat generating load 14 or the unit side switching element 22. The overcurrent protection unit 51 may be a mechanical fuse disposed in the switching unit 21 or may be a circuit formed inside a semiconductor relay that constitutes the unit-side switching element 22 or a memory (not shown). May be realized by an overcurrent protection function realized by a control unit (not shown) executing a program stored in the above.

  Since the configuration other than the above is substantially the same as that of the first embodiment, the same members are denoted by the same reference numerals, and redundant description is omitted.

  According to the present embodiment, it is possible to suppress an overcurrent from flowing through the wire harness system 11 by electrically connecting the switching unit 21 to the wire harness system 11. As a result, the fuse 39 that has been conventionally provided in the electrical junction box 16 can be omitted, and the electrical junction box 16 can be miniaturized.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) It suffices that at least one switching unit 21 is attached to the wire bundle 18, and the switching unit 21 attached at a position different from the wire bundle 18 may exist.

  (2) The binding member may be a binding band. The binding band may be made of synthetic resin or metal.

  (3) The manual switch 38 is configured to be disposed on the instrument panel 37. However, the manual switch 38 is not limited thereto, and may be disposed on the armrest of the door, and can be disposed at any position as necessary. . Moreover, it is good also as a structure which replaces with the manual switch 38 and controls the switching unit 21 from electronic control units, such as body ECU.

  (4) In the present embodiment, the switching unit 21 is configured so that the unit-side switching element 22 formed of a semiconductor relay is accommodated. However, the present invention is not limited thereto, and the switching unit 21 includes a mechanical relay. It is good also as a structure in which the unit side switching element 22 consisting of is accommodated.

  (5) In the present embodiment, the switching units 21 are distributed and arranged in the wire bundle 18. However, the present invention is not limited to this, and a plurality of switching units 21 are integrated and attached to the wire bundle 18. Also good.

  (6) In the present embodiment, among the plurality of loads 14 and 15 connected to the same power supply system, at least the unit side that performs energization or disconnection on the high heat generation load 14 having the largest rated current Although the switching element 22 is arranged in the switching unit 21, the present invention is not limited to this, and the unit-side switching element 22 that performs energization or disconnection to the second heat generating load 14 having the second largest rated current is the switching unit. 21, and the switching unit 21 may be provided with a unit-side switching element 22 for energizing or disconnecting the high heat load 14 having the third highest rated current. The switching unit 21 is a unit that performs energization or disconnection on the loads 14 and 15 having an arbitrary rated current as required. It can be disposed side switching element 22.

DESCRIPTION OF SYMBOLS 10: Vehicle 11: Wire harness system 13: Wire harness 14: High heat generation load 15: Low heat generation load 16: Electric junction box 17: Electric wire 18: Electric wire bundle 19: Tape (binding member)
20: box side switching element 21: switching unit 22: unit side switching element 38: manual switch 40: protector 51: overcurrent protection unit

Claims (11)

A wire harness provided with a bundle of wires arranged in a vehicle and bundled with a plurality of wires; and
A plurality of loads electrically connected to the wire harness, and a wire harness system comprising:
In the electrical connection box electrically connected to the wire harness, a box-side switching element that performs energization or disconnection on at least one of the plurality of loads is disposed,
A switching unit different from the electrical junction box is electrically connected to the wire harness, and the switching unit performs unit-side switching for energizing or disconnecting at least one of the plurality of loads. The element is arranged,
The said switching unit is a wire harness system directly or indirectly attached to the said wire bundle in the position different from the said electrical-connection box.   The wire harness system according to claim 1, wherein a plurality of the switching units are distributed in the electric wire bundle. The unit-side switching element performs energization or disconnection on a high heat generation load having a relatively large calorific value among the plurality of loads.
The wire harness system according to claim 1 or 2, wherein the box-side switching element performs energization or disconnection on a low heat generation load having a relatively small calorific value among the plurality of loads.   The wire harness system according to claim 3, wherein the rated current of the high heat generation load is at least the largest of the plurality of loads connected to the same power supply system.   The wire harness according to any one of claims 1 to 4, wherein the electric wire is connected to the switching unit, and the switching unit is indirectly attached to the electric wire bundle via the electric wire. system.   The wire harness system according to any one of claims 1 to 5, wherein the switching unit is bound to the wire bundle by a binding member.   The wire harness system according to any one of claims 1 to 5, wherein the switching unit is fixed to the vehicle.   The wire harness system according to any one of claims 1 to 5, further comprising a protector surrounding an outer periphery of the wire harness, wherein the switching unit is fixed to the protector.   The wire harness system according to any one of claims 1 to 8, wherein the switching unit includes an overcurrent protection unit.   The wire harness system according to any one of claims 1 to 9, wherein the unit-side switching element includes an overcurrent protection unit.   The high heat generation load having a relatively large calorific value among the plurality of loads is one or a plurality of loads selected from the group consisting of a defroster, a deisa, a PTC heater, a blower fan, and a seat heater. The wire harness system according to any one of 10.

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