JP2001314026A - Wire harness protection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire harness protection device which can quickly detect a fault even if hard impact is applied to a wire harness, can reduce a damage to the wire harness and can prevent a fire accident due to leakage of electricity. SOLUTION: This wire harness protection device is provided with a conductive lean horse or a duct protector in which sensor conductors 1b, 9c for accommodating and holding a wire harness distributed at the rear surface of an instrument for a vehicle are embedded, and a wire harness fault detection and protection means 6 for detecting a short circuit between these sensor conductors 1b, 9c and a vehicle body or between these sensor conductors 1b, 9c and a wire conductor 3a of the wire harness 3 and thereby conducting preventive procedures such as indication of a fault of wire harness 3, issuance of an alarm and shut-off of the power supply for drive or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire harness protection device for protecting a wire harness routed in a transportation device such as an automobile, a railcar, an aircraft, and a mobile device such as a civil engineering machine from an impact such as a collision. It is about.

[0002]

2. Description of the Related Art Electric power, communication, control wires, optical fibers, and the like are bundled in a circular shape or in a plate shape (flat shape) in a transportation device such as an automobile, a railcar, an aircraft, and a moving device such as a civil engineering machine. The wiring harness which is arranged in is arranged. This wire harness is susceptible to vibration caused by the movement of mobile equipment, so if it comes into contact with sharp corners, sharp corners, or sharp points, the coating will be damaged, or the conductor will be exposed due to breakage of the wire, resulting in electrical leakage. May be caused. For this reason, a reinforcing tape is wound around at least the outer periphery of the portion where the wire harness is easily damaged, or furthermore, the outer periphery is protected by, for example, covering with a corrugated tube.

[0003]

However, the above-mentioned wire harness can sufficiently withstand relatively weak impacts caused by vibrations of mobile equipment, but cannot withstand strong impacts caused by collisions of mobile equipment. There was a risk that the coating of the wire harness could be damaged or broken due to strong contact with nearby parts or the body for mobile equipment, etc.

[0004] In order to solve such a problem, a wire harness portion which particularly requires protection is housed and held in a rigid rigid steel lean hose (JP-A-10-278710). Etc.). However, in order for the wire harness to sufficiently withstand the strong impact due to the collision or the like, the thickness of the lean hose must be increased even with steel, so that the lean hose becomes too heavy, There has been a problem that it is not compatible with the recent reduction in the weight of mobile equipment, particularly transportation equipment such as automobiles. Further, there is another problem that the lean hose becomes large and heavy, and handling such as mounting in a mobile device becomes complicated. On the other hand, if you make this lean hose thinner,
Although it is lightweight and compact, it is easy to handle, but the mechanical strength is reduced and the wire harness cannot be sufficiently protected, the conductor is exposed and short-circuited due to damage to the wire harness coating, disconnection, etc. And there was a risk of causing a fire accident.

[0005] The present invention solves the above problems, and even if a strong impact is applied to the wire harness, the abnormality of the wire harness is quickly detected, and the conductor is exposed due to damage to the coating of the wire harness, disconnection, and the like. Even if there is a short circuit and a short circuit,
An object of the present invention is to provide a protection device for a wire harness that prevents a fire accident after a short circuit to notify a driver (operator) before a fire occurs.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a wire harness protection device according to a first aspect of the present invention. The short-circuit between the hollow holding body and the hollow holding body and the body for mobile equipment, or between the hollow holding body and the wire harness is detected. It is provided with a wire harness abnormality detection protection means for performing preventive measures such as shutting off the drive power supply.

According to a second aspect of the present invention, there is provided a wire harness protection device including a hollow holder for housing and holding a wire harness arranged in a mobile device, and a strain sensor attached to the hollow holder or the wire harness. Further, the apparatus is provided with a wire harness abnormality detection protection means for detecting an abnormal pressing force acting on the strain sensor, thereby performing a preventive measure such as an abnormal display of the wire harness, an alarm, and a cutoff of the drive power supply.

According to a third aspect of the present invention, there is provided a wire harness protection device according to the first or second aspect, wherein the hollow holding member is provided on the back surface of the instrument for mobile equipment along the length direction. It is composed of a lean hose or duct-shaped protector to be arranged.

According to the wire harness protection device of the first aspect of the present invention, a strong impact is applied to the conductive hollow holder and the wire harness due to a collision of moving equipment, and the hollow holder is largely deformed. Even if the conductor is exposed due to breakage, damage to the coating of the wire harness, disconnection, etc., even if the hollow holder and the body for mobile equipment or the hollow holder and the wire harness are short-circuited, This short circuit is quickly detected by the wire harness abnormality detection protection means. Next, this abnormality is displayed on an indicator lamp or a warning lamp, or an alarm sounds and the driver (operator) is immediately notified. Alternatively, based on this abnormality, the drive power supply that supplies (transmits) power, communication, and control signals to the wire harness is automatically cut off. Thereby, even if the conductor of the wire harness is exposed and a short circuit occurs, it is possible to prevent a fire accident from occurring. Furthermore, since it is not necessary to make the thickness of the hollow holder for housing and holding the wire harness excessively thick, the mounting of the hollow holder in a moving device is simple and easy to handle.

According to the wire harness protection device of the present invention, a strong impact is applied to the hollow holder and the wire harness due to collision of moving equipment, and the hollow holder is largely deformed and damaged. Alternatively, even if the coating of the wire harness is damaged, these abnormalities are promptly detected by the abnormal pressing force acting on the strain sensor of the abnormality detecting and protecting means of the wire harness. Therefore, similarly to the above, this protection device can prevent the occurrence of a fire accident due to electric leakage, and can easily handle the hollow holder. Further, according to the present invention, since the abnormal pressing force by the hollow holder or the wire harness is detected by the strain sensor, before the hollow holder or the wire harness is seriously damaged, in other words, the wire harness may cause an electric leakage accident. Before that, it is possible to notify the driver (operator) of the abnormality or to cut off the drive power supply, so that damage to the wire harness can be reduced.

According to the wire harness protection device of the third aspect of the present invention, it is not necessary to excessively increase the thickness of the lean hose or the duct-shaped protector that houses and holds the wire harness. For this reason, these members do not become excessive weight and an excessively large shape, and can be easily attached to and detached from a narrow space on the back surface of the instrument for mobile equipment, and do not become a hindrance when attaching other equipment parts. The complexity of these operations is eliminated.

[0012]

(Embodiment 1) Next, Embodiment 1 of a wire harness protection device according to the present invention will be described with reference to the drawings. FIGS. 1 (a) and 1 (c) show a hollow for accommodating and holding a wire harness 3 in which a plurality of electric power, communication or control electric wires 2 (including a composite of the electric wires and optical fibers) are bundled and bound in a circular shape. This shows a tubular lean hose 1 as a holding body. The lean hose 1 includes, for example, a hose main body 1a made of an electrically insulating material FRP (fiber reinforced plastic) and a sensor conductor 1b embedded in the inside thereof along the length direction, and has conductivity. I have. The sensor conductor 1b is formed, for example, by vertically covering a conductive strip or sheet of copper, aluminum, iron, or the like in the circumferential direction, or by winding this conductive linear body in a spiral shape. It is formed. Fig. 1 shows the lean hose 1
As shown in (b), mounting fixtures 4 are provided at both ends. As shown in FIG. 2, the lean hose 1 is attached to a back surface of an instrument 8 for a mobile device, for example, an instrument 8 for a vehicle, along a length direction (axle direction) with a fixture 4, and is internally provided. The wire harness 3 held and held is protected. The sensor conductor 1b at one end of the lean hose 1 includes
As shown in (c), a terminal 7 connected to the abnormality detection protection means 6 of the wire harness via the lead wire 5 is attached.

FIGS. 3A and 3B show an example in which a duct-shaped protector 9 is used as a hollow holder. This protector 9 is formed in a duct shape by combining a protector body 9a made of FRP with an open upper part and having a U-shaped cross section and a lid 9b made of FRP with an open lower part and having a U-shaped cross section. You. A sensor conductor 9c is embedded in the protector body 9a along the length direction. Thereby, the duct-shaped protector 9 has conductivity. The sensor conductor 9c may also be formed by vertically covering a conductive strip or sheet of copper, aluminum, iron, or the like in the circumferential direction, or by winding this conductive linear body in a spiral shape. Formed by The wire harness 3 housed and held in the duct-shaped protector 9 is formed by arranging a plurality of electric wires 2 in a laterally flat shape and joining them so that the electric wires do not separate from each other. The wire harness 3 is accommodated in a protector body 9a of the duct-shaped protector 9. The lid 9b is put on the upper part of the holding protector body 9a in which the wire harness is accommodated and held therein, and is fixed to the protector main body 9a by engaging means such as uneven fitting or a tightening band. On the side surface of the lid 9b of the duct-like protector 9, a protector fixing tool for fixing the duct-like protector to the automobile instrument is provided. At one end of the protector body 9a and the lid 9b in the length direction, a sensor conductor take-out portion 9d is provided, and as shown in FIG. The terminal 7 connected to the abnormality detection protection means 6 of the wire harness is attached. The sensor conductor 1
b and 9c are the following wire harness abnormality detection and protection means 6.
Which constitute a part of.

[0014] Wire harness abnormality detection and protection means 6
Is, for example, as shown in FIG.
Electromagnetic contact between the drive power supply 9c, one end (the other end is grounded) of the sensor conductors 1b and 9c of the lean hose 1 (or the duct-shaped protector 9) and the electric wire conductor 3a of the wire harness 3 , The short-circuit current controller 13, the drive power supply 11, and the sensor conductors 1b, 9
An abnormal indicator lamp 15, an abnormal alarm (buzzer) 16, and a self-holding relay coil 17, which are connected in parallel with the electromagnetic contactor 12 and the short-circuit current controller 14, between one end of the relay c. The electromagnetic contactor 12 includes the exciting coil 1
3 and its B contact 13c (open and return manually by demagnetizing the exciting coil 13) and the following A contacts 13a and 13b (close and return manually by demagnetizing the exciting coil 13). The short-circuit current controller 14 controls the electric wire conductor 3 a of the wire harness 3.
Heater 14a interposed between the magnetic contactor 12 and
And a bimetal 14b that can be adjusted by the heating of the heater 14a. As shown in FIG. 4, the B contact 17b of the self-holding relay coil 17 and the A contact 13a of the exciting coil 13 are connected in series with the abnormality indicator lamp 15 and the abnormality alarm device 16. Further, A of the exciting coil 13 is connected in series with the self-holding relay coil 17.
Contact 13b and A contact 17 of self-holding relay coil 17
a is connected. Further, reference numeral 18 denotes a push button for turning off the abnormality indicator lamp 15 and stopping the alarm of the abnormality alarm device 16, and is connected in parallel with the A contact 17a of the self-holding relay coil 17.

Next, a method of using the wire harness protection device according to the first embodiment of the present invention will be described with reference to FIG.
This device is attached to, for example, an instrument for a vehicle and travels with the vehicle. Then, for some reason, this car collides with an obstacle such as another car or a building, and a strong impact is applied to the wire harness 3, and the lean hose 1 (or the duct-shaped protector 9) and the wire harness 3 are damaged, and the lean It is assumed that the sensor conductors 1b and 9c of the hose 1 (or the duct-shaped protector 9) and the wire conductor 3a of the wire harness 3 come into contact with each other and short-circuit, thereby causing an electric leakage accident.

Then, a short-circuit current flows from the wire conductor 3a of the wire harness 3 to the sensor conductors 1b and 9c of the ground-side lean hose 1 (or the duct-shaped protector 9), and the thermal heater 14a of the short-circuit current controller 14
Is heated, the bimetal 14b bends, and the bimetal contact opens. When this contact is opened, the current flowing from the drive power supply 11 to the exciting coil 13 of the electromagnetic contactor 12 is cut off, and the exciting coil 13 is demagnetized. As a result, the B contact 13c of the electromagnetic contactor 12 is opened, the short-circuit current flowing from the drive power supply 11 to the wire harness 3 is quickly cut off, and it is possible to prevent the accident from spreading from a leakage accident to a fire accident. .

Further, in the present embodiment, when an electric leakage accident due to a short circuit occurs, a short circuit current flowing through the wire harness 3 is cut off, this abnormality is displayed, and an alarm can be sounded. . That is, at the same time when the exciting coil 13 is demagnetized,
Since the contacts 13a and 13b are closed, the abnormality indicator lamp 15 and the abnormality alarm device 16 are activated, and the abnormality display and the abnormality alarm can be performed. Next, when the driver (operator) presses the push button 18, the abnormality indicator light 15 and the abnormality alarm device 16
Self-holding relay coil 17 connected in series with
B contact 17b is opened, the operation of the abnormality indicator lamp 15 and the abnormality alarm device 16 is stopped, the abnormality display disappears, and the alarm stops. At this time, the A contact 1 of the self-holding relay coil 17
7a is also closed, so that the self-holding relay coil 17 maintains the excited state, and the B contact 17b maintains the open state. Therefore, even if the push button 18 is released, the abnormality indicator 15
And the abnormality alarm device 16 does not operate. Next, the driving power supply 11
The main circuit switch (not shown) is opened to turn off the circuit of the abnormality detection protection means 6, and the wire harness 3 is turned off.
Perform trouble repair such as. When the main circuit switch is opened, the self-holding relay coil 17 is demagnetized, and the A contact 17a and the B contact 17b return to the initial state. Also, the A contacts 13a and 13b and the B contact 13c of the exciting coil 13 of the electromagnetic contactor 12 are manually returned to prepare for restart.

The short-circuit current controller 14 can control the magnitude of the short-circuit current that demagnetizes the exciting coil 13 of the electromagnetic contactor 12 by appropriately adjusting the position of the bimetal contact. For example, when the current capacity of the wire harness 3 is small, it is possible to open the B contact 13c of the electromagnetic contactor 12 with a small short-circuit current to interrupt the current.

In the first embodiment, when a short circuit of the wire harness 3 causes a short circuit, an abnormal display, an abnormal alarm and a drive power supply are performed.
Of these abnormal indications, abnormal alarms, and drive power cutoffs,
Any one or two means may be appropriately combined, another wire harness protection means may be used, or this wire harness protection means may be further combined to protect against fire accident.

Further, in the first embodiment, the lean hose
Although the technical means for detecting a short circuit between the wire harness 3 and the wire harness 3 (or the duct protector 9) has been described, a short circuit between the lean hose 1 (or the duct protector 9) and the vehicle body is detected. You may make it. FIG. 5 shows an example of the abnormality detection and protection means 19 of the wire harness. In this example, the secondary side of the B contact 13c of the electromagnetic contactor 12 is connected to the wire conductor 3a of the wire harness 3.
Connect directly to. Further, the sensor conductors 1b and 9c of the lean hose 1 (or the duct-shaped protector 9) are floated without grounding, and one end thereof is connected to the short-circuit current controller 14.
When a short circuit occurs between the lean hose 1 (or the duct-shaped protector 9) and the vehicle body 20 and a short circuit occurs, a short-circuit current flows through the thermal heater 14a. Further, the secondary side of the bimetal 14b of the short-circuit current controller 14 is connected to the vehicle body 20 to be grounded. The configuration other than the above is the same as that of the abnormality detection protection means 6 shown in FIG. Then, when this car collided, a strong shock was applied to the wire harness 3 and the lean hose 1
(Or duct protector 9) and wire harness 3 are damaged, and lean hose 1 (or duct protector 9) is damaged.
It is assumed that the sensor conductors 1b and 9c of 9) are exposed and come into contact with the vehicle body 20 conductor 3a to cause a short circuit, thereby causing a leakage fault.

Then, a short-circuit current flows through the sensor conductors 1b and 9c of the lean hose 1 (or the duct-shaped protector 9), and the thermal heater 14 of the short-circuit current controller 14
a is heated, the bimetal 14b curves, and the bimetal contact opens. When this contact is opened, the current flowing from the drive power supply 11 to the exciting coil 13 of the electromagnetic contactor 12 is cut off, and the exciting coil 13 is demagnetized. As a result, the B contact 13c of the electromagnetic contactor 12 is opened, the short-circuit current flowing from the drive power supply 11 to the wire harness 3 is quickly cut off, and it is possible to prevent the accident from spreading from a leakage accident to a fire accident. . Other uses of the abnormality detection protection means 10 are the same as those of the abnormality detection protection means 6.

When a short circuit between the lean hose 1 (or the duct-shaped protector 9) and the vehicle body is detected, the abnormality detection protection means is different from the abnormality detection protection means 19 and is not shown. Is the driving power supply 11
Alternatively, another power supply is connected to the sensor conductors 1b and 9c of the lean hose 1 (or the duct-like protector 9) via a detector, for example, an abnormality indicator light 15 or an abnormality alarm device 16,
When the sensor conductors 1b and 9c are short-circuited and the electric circuit is closed from the power supply via the ground, the detector, for example, the abnormality indicator light 15 or the abnormality alarm device 16 is operated to display an abnormality or an alarm. To contact the driver (operator).

(Embodiment 2) Next, a wire harness protection device according to Embodiment 2 of the present invention will be described with reference to FIG. In this embodiment, as shown in FIG. 6A, for example, a lean hose 21 is used as a hollow holding body that houses and holds a wire harness 3 inside. Lean hose 2
1 has appropriate rigidity, and is formed of, for example, an FRP material. Unlike the lean hose 1, the hose 21 does not always need to be made conductive by burying a sensor conductor inside. A plurality of strain sensors 22 are attached to the outer peripheral surface of the hose 21 at predetermined intervals in the length direction. The strain sensors 22 are electrically connected to each other by the lead wire 5. As the strain sensor 22, for example, a sensor whose electric resistance increases when a pressing force acts on the strain sensor 22 is used. The strain sensor 22 may be attached at a predetermined interval also in the circumferential direction of the lean hose 21. In addition,
Although not shown, a duct-shaped protector having a structure like the duct-shaped protector 9 shown in the first embodiment may be used as the hollow holder. However, it is not always necessary to make this duct-shaped protector conductive.

Abnormality detection protection means 2 for wire harness 3
3 is, for example, as shown in FIG. 6B, the strain sensor 22, a constant current source 24 electrically connected to one end of the strain sensor 22, and a secondary side of the constant current source 24. Voltage monitor 2 connected between the other end of sensor 22 and ground
5 and an operation unit 26 for displaying an abnormality of the wire harness 3 or the lean hose 21 (or the duct-shaped protector), an alarm, or interrupting the current of the wire harness 3 based on a predetermined output signal of the voltage monitor 25. .

Next, a method of using the wire harness protection device according to the second embodiment of the present invention will be described with reference to FIG. This device is also attached to, for example, an automobile instrument, and travels with the automobile. Then, for some reason, this car collides with an obstacle such as another car, a building, or the like, and a strong impact is applied to the wire harness 3, and an abnormal pressing force is applied to the lean hose 21 (or the duct-shaped protector) and the wire harness 3. It is assumed that the wire harness 3 is severely damaged by the action, the coating of the wire harness 3 is broken, and the wire conductor 3a is exposed or broken, and the conductor comes into contact with the vehicle body to cause a short circuit, thereby causing an electric leakage accident.

In such a case, the lean hose 21 (or the duct-shaped protector) is substantially deformed substantially,
A large pressing force acts on the strain sensor 22, and the strain sensor 2
2, the electrical resistance increases. On the other hand, the constant current source 24
Since a constant current always flows through the strain sensor 22, the potential difference between both ends of the strain sensor 24, that is, the voltage increases according to Ohm's law, and the voltage is detected by the voltage monitor 25. As shown in FIG. 6C, when the voltage exceeds a predetermined reference value (threshold) Vs and rises to Va, for example, the meter relay is activated or
Alternatively, the voltage signal Va is compared with the reference value (threshold value) Vs stored in the semiconductor comparison circuit (not shown), and when the voltage signal Va exceeds the reference value (threshold value) Vs, a command is sent to the operation unit 26 and An abnormality display and an abnormality alarm of the harness 3 or a current interruption of the wire harness 3 are performed.
As a result, it is possible to prevent the accident from spreading to a fire after the wire harness 3 is short-circuited and short-circuited.

According to the abnormality detecting and protecting means 23 which detects the pressing force by the strain sensor 22, it is possible to grasp the degree of the abnormal state such as whether or not there is a high possibility that the wire harness 3 is short-circuited to cause an electric leakage accident. It is also possible. In other words, as the pressing force applied to the lean hose 21 (or the duct-shaped protector) or the wire harness 3 increases and the degree of damage increases, the electric resistance of the strain sensor 22 increases greatly, and the lean hose 21 (or the duct-shaped protector) and the like become harder. As the applied pressing force becomes smaller and the degree of damage becomes lighter, the electric resistance of the strain sensor 22 is greatly reduced. Therefore, the relationship between the voltage detected by the voltage monitor 25 and the damage state of the wire harness 3 or the lean hose 21 (or the duct-shaped protector) may be obtained in advance by an experiment or the like. In FIG. 6C, a region X larger than the voltage Vs indicates a short-circuit leakage region in which the wire harness 3 is significantly damaged, the electric wire conductor 3a is exposed or disconnected, and comes into contact with an automobile body to cause a short circuit or a leakage accident. Show. The region Y of the voltage Vs-Vb corresponds to the wire harness 3
Indicates a short-circuit / leakage danger area where there is a high risk of causing a short-circuit or a ground fault. An area Z smaller than the voltage Vb indicates a safe short-circuit leakage safety area in which the wiring harness 3 is less likely to cause a short circuit and a leakage accident. Thus, when a strong impact is applied to the wire harness 3 or the like due to a collision of the car,
The damage state of the wire harness 3 and the like can also be grasped, and the driver (operator) can easily perform an optimal preventive measure in advance according to the damage state of the wire harness 3 and the like.

In the description of the second embodiment, the wire harness 3 is made using the pressing force applied to the strain sensor 22.
4 and 5 are detected. Further, if the lean hose 21 (or the duct-shaped protector) has the conductive structure provided with the sensor conductor shown in the first embodiment, it will be described with reference to FIGS. The short circuit of the wire harness 3 can be detected by using the abnormality detection protection means 6 and 19 of the wire harness as shown in FIG. It is preferable to use two types of short-circuit detection methods in this way, since detection accuracy and reliability of a short-circuit or the like of the wire harness 3 can be improved.

In the second embodiment, the strain sensor 2
2 has been described on the outer peripheral surface of the lean hose 21 (or the duct-shaped protector), but the strain sensor 22 is attached along the length direction to the outer peripheral surface of the wire harness 3 housed and held in the lean hose 21. The pressing force acting on the wire harness 3 or the like may be detected to grasp the short circuit of the wire harness 3 and the damage state of the wire harness 3 and the lean hose 21.

In the first and second embodiments, an example has been described in which an automobile such as a passenger car or a truck is used as a mobile device.
The present invention can also be applied to mobile devices other than automobiles, for example, railway vehicles, aircraft, civil engineering construction machines, cranes, and the like. Further, the hollow holding body that houses and holds the wire harness is not limited to the lean hose or the duct-shaped protector, but can be applied to a trough, a tube, a pipe, a gutter, and the like. Further, as the wire harness 3, in addition to the instrument wire harness, various wire harnesses such as an engine wire harness, an engine main wire harness, a cowl wire harness, a floor wire harness, a roof wire harness, etc. Is also applicable.

[0031]

As described above, according to the first aspect of the present invention,
According to the wire harness protection device described above, a strong impact is applied to the conductive hollow holding member and the wire harness due to collision of the moving device, etc., and between the hollow holding member and the body for the moving device, or the hollow holding member. Should a short circuit occur between the cable harness and the wire harness, this can be quickly detected. Further, based on this, it is possible to take preventive measures such as an abnormal display of the wire harness, an abnormal alarm, and a cutoff of the drive power supply.
It is possible to prevent a fire accident from occurring. Also, since it is not necessary to make the thickness of the hollow holder for housing and holding the wire harness excessively thick, the mounting of the hollow holder in a moving device is simple and easy to handle.

According to the wire harness protection device according to the second aspect of the present invention, a strong impact is applied to the hollow holder and the wire harness due to collision of moving equipment, and the hollow holder is largely deformed and damaged. Alternatively, even if the wire harness coating is damaged and short-circuited, these abnormalities can be promptly detected by the abnormal pressing force acting on the strain sensor of the wire harness abnormality detecting and protecting means. Accordingly, similarly, it is possible to prevent the occurrence of a fire accident due to electric leakage, and it is also easy to handle the hollow holder. Also, since the abnormal pressure is detected by the hollow holder or the wire harness by the strain sensor, before the hollow holder or the wire harness is seriously damaged, that is, before the wire harness causes a large accident such as a short circuit or a short circuit, The degree of the abnormal state can be grasped, and damage to the wire harness can be reduced.

According to the wire harness protection device according to the third aspect of the present invention, it is not necessary to excessively increase the thickness of the lean hose or the duct-shaped protector for housing and holding the wire harness, so that these members have excessive weight. It does not become too large and easy to attach and detach to the narrow space on the back of the instrument for mobile equipment, does not hinder other equipment parts, and eliminates the complexity of these operations Can be.

[Brief description of the drawings]

FIG. 1 shows a lean hose which is a hollow holding body in a wire harness protection device according to a first embodiment of the present invention. FIG. 1 (a) shows a part of a state where a wire harness is housed and held in a lean hose. (B) is a perspective view showing the entire lean hose, and (c) is a cross-sectional view showing an enlarged portion A (one end of the lean hose) of (b).

FIG. 2 is a diagram showing a state in which the lean hose shown in FIG. 1 is attached to an automobile instrument.

FIG. 3 shows a duct-shaped protector as a hollow holding body in the wire harness protection device according to the first embodiment of the present invention. FIG. 3 (a) shows a state in which the wire harness is housed and held in the duct-shaped protector. Perspective view,
(B) is a perspective view of the state where the vicinity of one end of the duct-shaped protector of (a) is disassembled.

FIG. 4 is a circuit configuration diagram illustrating a wire harness abnormality detection and protection unit of the wire harness protection device according to the first embodiment of the present invention.

FIG. 5 is a circuit diagram showing a modification of the wire harness abnormality detection and protection means shown in FIG. 4;

6A and 6B show a second embodiment of the present invention, in which FIG. 6A is a perspective view showing a state in which a strain sensor is attached to a lean hose, FIG. 6B is a circuit configuration diagram showing a wire harness abnormality detection protection means, (C) is an explanatory view showing the relationship between the voltage detected by the voltage monitor of (b) and the damage state of the wire harness.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lean hose 1a Hose main body 1b Sensor conductor 2 Electric wire 3 Wire harness 3a Electric wire conductor 4 Attachment 5 Lead wire 6 Wire harness abnormality detection protection means 7 Terminal 8 Automotive instrument 9 Duct protector 9a Protector main body 9b Lid 9c Sensor Conductor 9d Sensor conductor take-out part 10 Protector fixture 11 Drive power supply 12 Electromagnetic contactor 13 Exciting coil 13a A contact 13b A contact 13c B contact 14 Short circuit current controller 14a Thermal heater 14b Bimetal 15 Abnormal indicator 16 Abnormal alarm 17 Self-holding Relay coil 17b B contact 17a A contact 18 Push button 19 Wire harness abnormality detection protection means 20 Automobile body 21 Lean hose 22 Strain sensor 23 Wire harness abnormality detection protection hand Step 24 Constant current source 25 Voltage monitor 26 Operation unit X Short circuit leakage area Y Short circuit leakage danger area Z Short circuit leakage safety area

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B61G 7/14 G01R 31/02 G01R 31/02 H02G 1/00 F H02G 1/00 H01B 7/00 301 // H01B 7 / 00 301 H02G 3/28 F

Claims (3)

[Claims] 1. A conductive hollow holder for accommodating and holding a wire harness routed in a mobile device, and between the hollow holder and the body for the mobile device, or between the hollow holder and the wire harness. A wire harness protection device comprising a wire harness abnormality detection and protection means for detecting a short circuit occurring therebetween and performing preventive measures such as an abnormality display of the wire harness, an alarm, and a cutoff of a drive power supply. . 2. A hollow holder for accommodating and holding a wire harness routed in a mobile device, and a strain sensor attached to the hollow holder or the wire harness. A protection device for a wire harness, comprising a wire harness abnormality detection and protection means for detecting and thereby performing preventive measures such as an abnormality display of a wire harness, an alarm, and a cutoff of a drive power supply. 3. The wire harness according to claim 1, wherein the hollow holding body is a lean hose or a duct-like protector arranged along a length direction on a back surface of the instrument for mobile equipment. Protective equipment.