JPH11301376A - Power supply shutoff device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fire of a vehicle from occurring even if a wire harness is short-circuited, by shutting off a part between a battery and a wire harness when there is a possibility of generation of a trouble on the wire harness. SOLUTION: When an air bag ignition signal is not fed, a cylinder 19 of a cylinder mechanism 20 is held in the initial position, a plus terminal of a battery and a large capacity fuse are electrically connected by a contact releasing mechanism 21. When an air bag ignition signal is fed in this state, air is injected from a driving force generating mechanism 18 to slide the cylinder 19 of the cylinder mechanism 20, a contact of the contact releasing mechanism 21 is opened, and the plus terminal of the battery and the large capacity fuse is electrically shut off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power cut-off device for shutting off a battery and a wire harness when an automobile collides or the like and preventing overheating due to a short-circuit of the wire harness at the time of collision.

[0002]

2. Description of the Related Art In a vehicle such as an automobile, a fuse is used for a wire harness that supplies a battery voltage to each load provided in each part of the vehicle so that the wire harness or the like does not short-circuit and burn. Excessive current is prevented from flowing for a long time.

FIG. 10 shows the use of such a fuse.
FIG. 2 is a circuit diagram illustrating an example of an electrical system that protects a wire harness and the like.

An electrical system 201 shown in FIG. 1 includes a battery 203 having a negative terminal 202 connected to the body of an automobile, and a positive terminal 20 of the battery 203.
4, a large-capacity fuse 206 that blows out when a large current flows through an electric wire 205 (an electric wire constituting a wire harness 208 described later) and cuts off the circuit, and is supplied through the large-capacity fuse 206. The battery voltage is applied to each of the loads 207A and 207B disposed in each part of the vehicle.
And a load 207A, 207 disposed at each branch point of the wire harness 208.
A medium-capacity fuse (or small-capacity fuse) 209 that blows when a large current flows through B to cut off the circuit;
It is arranged at each branch point of the wire harness 208, and when a drive signal is supplied, the coil 210 is turned on, and the contact 211 is closed using the magnetic force obtained thereby to supply the battery voltage to the load 207. Relay 21
2 is provided.

In the electrical system 201 having the above configuration,
When the ignition switch is operated, the battery 2
03 plus terminal 204 → large capacity fuse 206 → wire 205 of wire harness 208 → medium capacity fuse 20
9 → wire 213 of wire harness 208 → load 207
The battery voltage is supplied to the load 207A through the path A. In parallel with this operation, when a drive signal is supplied, the relay 212 is turned on and the battery 20 is turned on.
The battery voltage is supplied to the load 207B through the path of the positive terminal 204 → the large-capacity fuse 206 → the electric wire 205 of the wire harness 208 → the relay 212 → the electric wire 214 of the wire harness 208 → the load 207B.

[0006]

By the way, in such an electric equipment system 201 for an automobile, the wire harness 2
The allowable current value is determined so that the large-capacity fuse 206 and the medium-capacity fuse 209 are blown immediately even if each of the electric wires 205, 213, and 214 constituting 08 is short-circuited.

However, these large-capacity fuses 20
6 and the medium-capacity fuse 209, it takes a certain amount of time until the temperature of the large-capacity fuse 206 or the medium-capacity fuse 209 becomes higher than or equal to a predetermined temperature and blows out after the current that exceeds the allowable current value starts flowing. Therefore, when a short circuit of each of the electric wires 205, 213, and 214 occurs in a short time, that is, when a so-called rare short circuit occurs, each of the electric wires 205, 213, and 214 becomes large before the large capacity fuse 206 and the medium capacity fuse 209 are blown. There was a problem that current flowed.

When a strong pressure is applied to the electrical system 201 from the outside such that the wire harness 208 is crushed, the large-capacity fuse 206 and the medium-capacity fuse 209 must be blown before being blown. It is more preferable to shut off the connection between the battery 203 and the wire harness 208.

The present invention has been made in view of the above circumstances, and in the event of a collision of a vehicle or the like, a cylinder mechanism is operated by using pre-filled air or the like to open a contact opening mechanism, thereby opening a battery. It is an object of the present invention to provide a power supply shut-off device capable of shutting off a wire harness and the like to prevent overheating due to a short-circuit of the wire harness at the time of collision.

[0010]

In order to achieve the above object, according to the present invention, according to the present invention, a circuit cut-off signal is inserted in a circuit connecting a battery of a vehicle and loads provided in respective parts of the vehicle. In a power cut-off device that cuts off a circuit when a signal is input and stops power supply to each load, the air or gas activator that is fixed to the vehicle body side and is filled when a circuit cut-off signal is supplied. A driving force generating mechanism for ejecting a gas obtained by sublimating a cylinder, a cylinder mechanism fixed to the body and sliding a cylinder or a shaft when air or gas is supplied from the driving force generating mechanism, and a cylinder mechanism When the cylinder or shaft is not slid, an electrical connection is made between the battery and each of the loads, and the cylinder or shaft is When id is characterized in that a contact opening mechanism for electrically disconnecting between said battery each load.

According to a second aspect of the present invention, in the power supply cutoff device according to the first aspect, the circuit cutoff signal is an airbag ignition signal output from a sensor that detects a collision of the vehicle.

According to a third aspect of the present invention, in the power supply cutoff device according to the first or second aspect, the cylinder mechanism or the contact opening mechanism, once operated, changes the operation completion state until the return processing is completed. It is characteristically held.

According to the above configuration, in the first aspect, when the circuit cutoff signal is not supplied, the battery is electrically connected to each of the loads by a contact opening mechanism. When the signal is supplied, the driving force generating mechanism fixed to the body side of the vehicle ejects the gas obtained by sublimating the filled air or gas activator, and the cylinder mechanism fixed to the body By sliding the cylinder or shaft, switching the switch of the contact opening mechanism, and electrically disconnecting between the battery and each of the loads, for example, when a vehicle collides, the air or the like that has been filled in advance is removed. Use
The cylinder mechanism is operated to open the contact opening mechanism, thereby shutting off the connection between the battery and the wire harness, etc., to prevent overheating due to short-circuit of the wire harness at the time of collision.

According to a second aspect of the present invention, an airbag ignition signal output from a sensor for detecting a collision of a vehicle is used as a circuit cutoff signal. To prevent overheating and sparks due to shorting of the wire harness at the time of collision.

According to a third aspect of the present invention, when the cylinder mechanism or the contact opening mechanism is operated once, the operation completion state is mechanically held until the return processing is completed, so that a vehicle collision occurs. In such a case, the battery is disconnected from the wire harness, etc., and the circuit interruption state is mechanically maintained until the release operation is performed, and power is supplied to the wire harness etc. until the accident processing is completed. Prohibit and increase safety.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram showing an example of an electric system of an automobile, which is an embodiment of a power cutoff device according to the present invention.

The electrical system 1 shown in FIG. 1 has a battery 3 in which a negative terminal 2 is connected to the body of an automobile.
And a power cutoff device 5 connected to the positive terminal 4 of the battery 3 and opened to shut off the circuit when an airbag ignition signal is output from an airbag acceleration sensor or the like provided in the automobile. And a large-capacity fuse 8 that is connected to the power supply cutoff device 5 and cuts off when a large current flows through the electric wire 6 (the electric wire constituting the wire harness 7) to cut off the circuit. A wire harness 7 for guiding the supplied battery voltage to each of the loads 9A and 9B disposed in each part of the vehicle;
The wiring harness 7 is disposed at each branch point and a load 9
A medium-capacity fuse (or small-capacity fuse) 10 that blows when a large current flows through A to cut off the circuit, and a coil 11 that is arranged at each branch point of the wire harness 7 and is supplied with a drive signal And the contact 12 is closed using the magnetic force obtained thereby, and the load 9B
And a relay 13 for supplying a battery voltage to the battery.

When the ignition switch is operated in the electrical system 1 having the above-described configuration, the positive terminal 4 of the battery 3 → the wire 57 of the wire harness 7 → the power cutoff device 5 → the wire 61 of the wire harness 7 → the large capacity fuse 8 → Wire 6 of wire harness 7 → Medium capacity fuse 1
A battery voltage is supplied to the load 9A through a path of 0 → the electric wire 14 of the wire harness 7 → the load 9A to operate the load 9A. In parallel with this operation, when a drive signal is supplied, the relay 13 is turned on, and the positive terminal 4 of the battery 3 → the electric wire 57 of the wire harness 7 → the power cutoff device 5 → the electric wire 61 of the wire harness 7 A battery voltage is supplied to the load 9B through a path of → a large-capacity fuse 8 → an electric wire 6 of the wire harness 7 → a relay 13 → an electric wire 15 of the wire harness 7 → a load 9B to operate the load 9B.

In this state, an abnormality occurs in each of the loads 9A, 9B and each of the electric wires 6, 14, 15 constituting the wire harness 7, and any of the electric wires 6, 14, 15, etc. When an excessive current flows, the large-capacity fuse 8, the medium-capacity fuse 10, and the like are blown, and the power supply to the electric wire in which the excessive current has flown is stopped.

When an automobile equipped with the electrical system 1 collides with another automobile or the like and an airbag ignition signal is output from an airbag acceleration sensor or the like,
The power cutoff device 5 operates to open the circuit. Thereby, the connection between the battery 3 and the wire harness 7 is cut off, and even if the wire harness 7 is crushed or a rare short circuit occurs, each of the wires 6, 14, 15, etc. constituting the wire harness 7. To prevent smoke or sparks due to overheating.

Next, referring to the perspective view shown in FIG.
The structure of the above-described power cutoff device 5 will be described in detail.

As shown in the figure, the power supply cutoff device 5 described above is fixed in a concave portion 17 of a substrate 16 fixed to the body of an automobile, and is filled when an airbag ignition signal is supplied. A driving force generating mechanism 18 for ejecting air and the cylinder 19 are slid when the air is supplied from the driving force generating mechanism 18 and fixed in the concave portion 17 and the cylinder 19 is slid until the return processing is performed. When the cylinder mechanism 20 for holding the cylinder mechanism 20 and the cylinder 19 of the cylinder mechanism 20 are not slid, the positive connection 4 of the battery 3 and the large capacity fuse 8 are electrically connected, and the cylinder 19 is slid. When the plus terminal 4 of the battery 3 and the large capacity fuse 8
And a contact opening mechanism 21 for electrically disconnecting the cylinder 19 from the cylinder mechanism 20 when the airbag ignition signal is not supplied. It is held in the initial position, and the positive terminal 4 of the battery 3 is
The large capacity fuse 8 is electrically connected. In this state, when the air back ignition signal is supplied, air is ejected from the driving force generating mechanism 18, and the cylinder 19 of the cylinder mechanism 20 is slid by the air to open the contacts of the contact opening mechanism 21. The positive terminal 4 of the battery 3 and the large-capacity fuse 8 are electrically disconnected.

As shown in FIG. 3, the driving force generating mechanism 18 has a hollow air tank 22 and a cylindrical air tank 22 fixed in a recess 17 formed in the substrate 16.
7, an air valve 23 in which one end of an air tank 22 is screwed into a screw hole formed in an inner surface on one end side thereof,
A gas filling unit 24 is provided on the side surface of the air tank 3 and is provided with a tube tip (not shown) of an air injecting machine. And the air valve 23
Female connector 25 provided on the upper part of the female connector 25, a male connector 2 removably inserted into the female connector 25.
And a connector 27 for receiving an air bag ignition signal when the air bag ignition signal is supplied.
3 to guide the air bag ignition signal taken in by the connector 27 to the other end of the air valve 23 and the hole 29 formed in the other end of the air valve 23. Low melting point alloy 30 to be provided
And provided in the hole 29 of the air valve 23,
And a heater 31 that generates heat when the airbag ignition signal is supplied via the heater 8 to melt the low melting point alloy 30.

When the tube end of the air injection device is attached to the gas filling section 24 and the air is supplied, the air is filled into the air tank 22 through the air valve 23. When a sufficient amount of air is filled, the tip of the tube of the air injector is removed from the gas filling unit 24. Thereafter, when an air bag ignition signal is output from the air bag acceleration sensor provided in the automobile, the air bag ignition signal is taken in by the connector 27, and the connector 27 → the electric wire 28 → the heater 3
In one path, the heater 31 is led to generate heat, and the resulting heat dissolves the low melting point alloy 30 to form a hole 2 formed in the other end of the air valve 23.
Release 9 Thereby, the air filled in the air tank 22 is supplied to the cylinder mechanism 20 from the hole 29 formed on the other end side of the air valve 23 via the inside of the air valve 23.

In this case, the gas filling portion 24 is welded to the side of the air valve 23 and the inside thereof is
A cylindrical member 33 that communicates with the inside of the air valve 23 through a hole 32 formed in a side surface of the air injection device, has a threaded surface formed outside the distal end, and into which a tube distal end of the air injector is screwed; When the pin 35 which is slidably disposed inside and projects outside from the gas injection port 34 formed at the tip of the cylindrical member 33 is pushed in, the gas injection port 34 is released to enable air injection. And a compression spring 37 disposed in the tubular member 33 to urge the closing member 36 to close the gas inlet 34.

Then, the tip of the tube of the air injector is screwed into the tip of the cylindrical member 33, and when the pin 35 is pushed in by the tip of the tube, the closing member 36 releases the gas inlet 34 and this state. The air supplied from the end of the tube of the air injection machine is introduced into the cylindrical member 33 through the gas injection port 34 by the air valve 2.
3 through the hole 32 formed on the side surface of the air valve 23.
And is charged into the air tank 22. Thereafter, when the tip of the tube of the air injector is removed from the tip of the tubular member 33 and the pushing of the pin 35 is released, the closing member 36 is pressed against the air inlet 34 by the urging force of the compression spring 37. Air inlet 3
4 is closed to prevent air from exiting outside.

The cylinder mechanism 20 has a cylinder cylinder 39 fixed in the recess 17 and having the other end of the air valve 23 screwed into a screw hole 38 formed in the head portion.
The rod-shaped cylinder 19 slidably inserted into the cylinder cylinder 39 and the concave portions of the large-diameter portions 40 and 41 formed on the base end side of the cylinder 19 are inserted into the cylinder 1.
9 and the two O-rings 42 and 43 for maintaining the airtightness between the outer surface of the cylinder cylinder 39 and the flange 44
7, the shaft portion 45 is inserted into a long hole 46 formed on the distal end side of the cylinder 19, and the spring 19 is inserted into the long hole 46. The compression spring 48 that urges the head side of the cylinder cylinder 39 and one of a plurality of latch grooves 49, 50, 51 formed on the outer surface of the distal end of the cylinder 19 are inserted into the cylinder 19 so that the cylinder 19 And a leaf spring 53 having one end fixed to the concave portion 17 and pressing the latch claw 52 fixed to the other end against the latch grooves 49, 50, 51. .

When air is not supplied from the driving force generating mechanism 18, the urging force of the compression spring 48
While urging the cylinder 19 toward the head of the cylinder cylinder 39, the latch claw 52 is fitted into the latch groove 49 for the initial position, thereby holding the cylinder 19 at the initial position. Thereafter, when air is supplied from the driving force generating mechanism 18 and the air is guided into the cylinder 39 through the hole 54 formed in the head portion of the cylinder 39, the cylinder 19 is slid to the spring stopper 47 side, When the distal end of the cylinder 19 shown in FIG. 3 comes into contact with the flange 44 of the spring stopper 47, and this stops and reaches the operation completion position, the latch pawl 52
Is inserted into the latch groove 51 for the operation completion position, and the cylinder 19 is prevented from returning to the original position.
The air is released from the air holes 55 formed in the cylinder cylinder 39 while prohibiting the movement of the air.

The contact opening mechanism 21 is formed of a ring-shaped insulating member, and has an electrode holding portion 56 fixed in the concave portion 17 formed in the substrate 16 while being inserted into the cylinder 19, and one end thereof. An electric wire 57 connected to the positive terminal 4 of the battery 3 and having the other end fixed to the electrode of the electrode holding portion 56 and an inner surface of the electrode holding portion 56. When the cylinder 19 is at the initial position, the center of the cylinder 19 is Abutting against one of the large-diameter portions 58 formed in the
Contact part 60, which is constituted by a multi-contact 59 for electrically connecting the cylinder 19 with the cylinder 19 and a ring-shaped insulating member, and which is fixed in the recess 17 formed in the substrate 16 while being inserted through the cylinder 19. When one end is connected to one end of the large-capacity fuse 8 and the other end is fixed to the electrode of the electrode holding portion 60 and the inner surface of the electrode holding portion 60 and the cylinder 19 is in the initial position, A multi-contact 63 is provided to contact the other large-diameter portion 62 formed at the center of the cylinder 19 to electrically connect the electric wire 61 and the cylinder 19.

The cylinder 19 of the cylinder mechanism 20
Is in the initial position, each multi-contact 59, 63
Abuts against the large diameter portions 58 and 62 of the cylinder 19, respectively, and the positive terminal 4 of the battery 3 → the electric wire 57 → the multi-contact 59 → the large diameter portion 58 → the cylinder 19 → the large diameter portion 62
→ Multi contact 63 → Electric wire 61 → Large capacity fuse 8
The battery voltage is supplied to the large-capacity fuse 8 through the path shown in FIG. Thereafter, the cylinder mechanism 20 is driven by the driving force generating mechanism 18, and the cylinder 19 is pushed out of the cylinder cylinder 39. When the operation reaches the operation completion position as shown in FIG. The electrical connection between the positive terminal 4 of the battery 3 and the large-capacity fuse 8 is electrically disconnected from the large-diameter portions 58 and 62 of the cylinder 19.

As described above, in this embodiment, the substrate 1
When the air bag ignition signal is not supplied, the cylinder 19 of the cylinder mechanism 20 is held at the initial position, and the contact opening mechanism 21 is connected to the positive terminal 4 of the battery 3 when the air bag ignition signal is not supplied. In this state, when an air bag ignition signal is supplied, air is blown out of the driving force generating mechanism 18 to slide the cylinder 19 of the cylinder mechanism 20 to make contact with the capacity fuse 8. Open the contact of the opening mechanism 21;
Since the connection between the positive terminal 4 of the battery 3 and the large-capacity fuse 8 is electrically cut off, when there is a possibility that a failure occurs in the wire harness 7, the battery 3
And the wire harness 7 and the like, whereby even if the wire harness 7 is short-circuited due to a collision of an automobile or the like, burning due to overheating can be prevented beforehand (the effect of claim 1). .

In this embodiment, air is blown from the driving force generating mechanism 18 based on the detection result of the air bag acceleration sensor for detecting that the automobile has collided, and the cylinder 19 of the cylinder mechanism 20 slides. Since the contact of the contact opening mechanism 21 is opened to electrically disconnect the positive terminal 4 of the battery 3 and the large-capacity fuse 8, an impact that may damage the wire harness 7 may be generated. Only when there is, it is possible to cut off the connection between the battery 3 and the wire harness 7 or the like.
Can be prevented from being burned out due to short-circuiting (effect of claim 2).

In this embodiment, when the vehicle collides and cuts off between the battery 3 and the wire harness 7 etc., the operation of the cylinder 19 is completed until the latch claw 52 is disengaged from the latch groove 51. Since the position is maintained, the power supply to the wire harness 7 and the like is prohibited until the accident processing is completed, so that the safety can be improved (the effect of claim 3).

In the above-described embodiment, the two large-diameter portions 58 and 62 formed in the central portion of the cylinder 19 are provided.
The multi-contacts 59 and 63 are brought into contact with each other to make the electric wires 57 and 61 conductive. However, as shown in FIG.
0 and 71, and a multi-contact 7 is provided in a circumferential groove 73 formed in the center of the cylinder 19.
4 and when the cylinder 19 is at the initial position, each electrode holding member 56, 60 is
Are electrically connected to make the positive terminal 4 of the battery 3 and the large-capacity fuse 8 conductive, and as shown in FIG. Air is injected from the mechanism 18 and the cylinder mechanism 20
When the cylinder 19 slides, the multi-contact 74 is removed from one of the electrodes 71, and the electrodes 70, 71 are electrically disconnected from each other.
And the large-capacity fuse 8 may be cut off.

In this case, similarly to the above-described embodiment, when the vehicle collides, the battery 3
And the wire harness 7 and the like can be cut off, and burnout due to short-circuit of the wire harness 7 at the time of collision can be prevented.

FIG. 7 is a perspective view showing another embodiment of the power cutoff device according to the present invention.

The power supply shut-off device 101 shown in FIG. 1 is formed of a thick plate having an insulating property, and is fixed to a substrate 102 fixed to the body side of an automobile and a recess 103 of the substrate 102, and is provided with an airbag ignition signal. Is supplied,
Driving force generating mechanism 104 for generating gas, concave portion 103
And a cylinder mechanism 105 that slides the shaft 117 (see FIG. 8) when the gas is supplied from the driving force generation mechanism 104 and holds the shaft at the slide completion position until the return processing is performed. When the shaft 117 of the cylinder mechanism 105 is not slid, the positive terminal 4 of the battery 3 is electrically connected to the large-capacity fuse 8, and when the shaft 117 is slid, the positive terminal 4 of the battery 3 is connected to the large terminal. A contact opening mechanism 106 for electrically disconnecting the air from the capacitive fuse 8. The contact opening mechanism 106 is fixed in a concave portion 103 formed in the substrate 102, and when an airbag ignition signal is not supplied,
The shaft 117 of the cylinder mechanism 105 is held at the initial position, and the positive terminal 4 of the battery 3 and the large capacity fuse 8 are electrically connected by the contact release mechanism 106. In this state, when an airbag ignition signal is supplied, gas is ejected from the driving force generating mechanism 104, the shaft 117 of the cylinder mechanism 105 is slid, the contacts of the contact opening mechanism 106 are opened, and the battery 3 is discharged. The positive terminal 4 and the large-capacity fuse 8 are electrically disconnected.

As shown in FIG. 8, the driving force generating mechanism 104 has a gas generating chamber 107 formed on the base end, a nozzle 108 formed on the distal end, and a gas generating chamber 107 formed on the substrate 102. A cylindrical member 109 disposed in the concave portion 103, and a member having an insulating property,
A cap 110 inserted into and fixed to an opening formed on the base end side of the gas generation chamber 107;
A gas activator 111 (for example, sodium azide used as a gas activator for an air bag, or a tetrazole that sublimates from a solid to a gas at 200 ° C.) 111 and the cap 110 A heater wire 114 disposed in the gas activator 111 and having its terminals 112 and 113 penetrating through a central portion of the cap 110 and exposed to the outside, and a gas generation chamber 107 formed on the base end side of the cylindrical member 109 are formed. And a band 115 fixed to the concave portion 103 of the substrate 102.

Then, an airbag ignition signal is output from the airbag acceleration sensor provided in the automobile. When this signal is supplied to the terminals 112 and 113, the heater wire 114 generates heat and the gas activator 111 is discharged. The sublimation is performed, and the gas obtained by the sublimation is jetted from the tip of a nozzle 108 formed in the cylindrical member 109, and the cylinder mechanism 105
To supply.

The cylinder mechanism 105 is formed of an insulating ring member.
A shaft 117 which is constituted by a spacer 116 inserted into the cylindrical member, a cylindrical metal member having conductivity disposed in the concave portion 103, and a base end side of which is slidably inserted into the nozzle 108 of the cylindrical member 109; The space between the inner circumference of the shaft 117 and the tip of the nozzle 108 is sealed so that the gas ejected from the tip of the nozzle 108 is not inserted into the circumferential grooves 118 and 119 formed on the tip of the nozzle 108. Two O-rings 120 and 121, a cylindrical reset valve 122 slidably inserted into the tip end of the shaft 117, and a reset valve 1.
Column-shaped reset knob 12 screwed into the tip side of
3 is fixed to the substrate 102, and holds the reset knob 123 slidably. When the reset knob 123 slides in the direction of arrow A, the reset knob 123
A stopper plate 125 that abuts against a large-diameter portion 124 formed at the base end of No. 3 and stops the movement of the reset knob 123.
Is inserted through the reset valve 122 and the reset knob 1
When the reset knob 123 is not urged in the direction opposite to the arrow A, the reset knob 123 is urged in the direction of the arrow A with respect to the shaft 117 so that the large-diameter portion 126 formed on the proximal end side of the reset valve 122. And a reset spring 127 for sealing the inside of the shaft 117.

When gas is ejected from the tip of the nozzle 108 constituting the driving force generating mechanism 104, the large diameter portion 126 of the reset valve 122 and the two O-rings are used by utilizing the pressure of the gas. The shaft 117 whose interior is sealed by 120 and 121 is moved in the direction of arrow A, and when the large diameter portion 124 of the reset knob 123 fixed to the tip of the shaft 117 comes into contact with the stopper plate 125, The movement of the shaft 117, the reset valve 122, and the reset knob 123 is stopped.

The contact opening mechanism 106 is made of a metal plate, and is inserted into a through hole 128 formed in the substrate 102, to which one end of the electric wire 57 is connected, and a terminal 129 of the terminal 129. The substrate 1 is formed by a metal cylinder integrally formed on the upper part, inserted through the shaft 117 and inserted into the spacer 116.
02, an electrode holding cylinder 130 arranged in the concave portion 103,
A multi-contact 131 which is attached to the inner surface of the electrode holding cylinder 130 and abuts on the shaft 117 when the shaft 117 is at the initial position to electrically connect the shaft 117 to the terminal 129;
Band 132 for fixing 0 to recess 103 of substrate 102
And a terminal 134 to which one end of the electric wire 61 is connected while being inserted into a through hole 133 formed in the substrate 102 and formed of a metal plate.
Is formed by a metal cylinder integrally formed on the upper part of the
3 and the electrode holding tube 135 attached to the inner surface of the electrode holding tube 135, and contacts the shaft 117 regardless of the position of the shaft 117 to electrically connect the shaft 117 and the terminal 134. The multi-contact 136 to be connected and the electrode holding cylinder 135 are connected to the substrate 102.
And a band 137 to be fixed to the concave portion 103.

When the shaft 117 is at the initial position, each of the multi-contacts 131 and 136 is
17 and the positive terminal 4 of the battery 3
→ Electric wire 57 → Terminal 129 → Multi contact 13
The battery voltage is supplied to the large-capacity fuse 8 through a route of 1 → electrode holding cylinder 130 → shaft 117 → multi-contact 136 → electrode holding cylinder 135 → terminal 134 → wire 61 → large-capacity fuse 8. Thereafter, gas is ejected from the nozzles 108 constituting the driving force generating mechanism 104, and the shaft 117 is pushed out in the direction of arrow A. As shown in FIG. Of the nozzle 108 and the shaft 11 while electrically disconnecting the positive terminal 4 of the battery 3 from the large-capacity fuse 8.
The excess gas is released from the gap 138 formed between the first and the second.

Thereafter, it is confirmed that there is no abnormality in the wire harness 7, etc.
Is pushed in the direction opposite to the arrow A, the reset spring 127 contracts, and the reset valve 122 is slid in the direction opposite to the arrow A with respect to the shaft 117,
The closed state of the reset valve 122 by the large diameter portion 126 is released, and a gap is formed between the outer peripheral surface of the reset valve 122 and the inner peripheral surface of the shaft 117. In this state, when the reset knob 123 is further depressed,
The shaft 117 is moved in the direction opposite to the arrow A while returning the air in the shaft 117 to the outside from the gap to return to the initial position. Thereby, each of the multi-contacts 131 and 136 abuts on the shaft 117, respectively, and the positive terminal 4 of the battery 3 → the electric wire 57 → the terminal 129 → the multi-contact 131 → the electrode holding cylinder 130
The supply of the battery voltage to the large-capacity fuse 8 is resumed along the path of the shaft 117 → the multi-contact 136 → the electrode holding cylinder 135 → the terminal 134 → the electric wire 61 → the large-capacity fuse 8.

As described above, in this embodiment, the substrate 1
When the air bag ignition signal is not supplied, the cylinder mechanism 10 is fixed in the recess 103 formed in the cylinder mechanism 10.
5 was held in the initial position, and the positive terminal 4 of the battery 3 and the large-capacity fuse 8 were electrically connected by the contact opening mechanism 106. In this state, the airbag ignition signal was supplied. At this time, gas is ejected from the driving force generating mechanism 104, and the shaft 117 of the cylinder mechanism 105 is slid to open the contacts of the contact opening mechanism 106, so that the positive terminal 4 of the battery 3 and the large capacity fuse 8 The space between them is electrically cut off. Therefore, when there is a possibility that a failure may occur in the wire harness 7, it is possible to cut off the connection between the battery 3 and the wire harness 7 or the like. It is possible to prevent a vehicle fire or the like from occurring.

Also, in this embodiment, the gas activator 11 of the driving force generating mechanism 104 is based on the detection result of the air bag acceleration sensor for detecting that the automobile has collided.
1 is sublimated, and the gas obtained by the sublimation is ejected, the shaft 117 of the cylinder mechanism 105 is slid, and the contacts of the contact opening mechanism 106 are opened. Is electrically interrupted, the battery 3 and the wire harness 7 can be shut off only when there is an impact that may damage the wire harness 7, thereby preventing a collision. It is possible to prevent a vehicle fire or the like due to a short circuit of the wire harness 7 at the time.

Further, in this embodiment, when the vehicle collides and cuts off the battery 3 and the wire harness 7 etc., the reset valve 122 prevents the air inside the shaft 117 from escaping to the outside. , The inside of the shaft 117 is sealed, so that power is not supplied to the wire harness 7 and the like until the resetting process is completed and the reset knob 123 is pushed in the direction opposite to the arrow A. Can be enhanced.

In each of the above-described embodiments, the power cutoff device 5 is used by using the airbag ignition signal output from the airbag acceleration sensor provided in the automobile.
101 is operated, but other signals, such as a change in current flowing through the wire harness 7 and a voltage change in the wire harness 7, are output from a determination circuit that determines the presence or absence of a rare short. The power cutoff devices 5 and 101 may be operated according to the determination signal.

In this way, even if the vehicle equipped with the power cut-off devices 5 and 101 does not collide with another vehicle or the like, when there is a possibility that some trouble may occur in the wire harness 7, By detecting this, the power supply to the wire harness 7 is stopped, and smoke or the like of the wire harness 7 can be prevented.

[0050]

As described above, according to the present invention, in the power supply shut-off device according to the first aspect, when the vehicle collides, the gas obtained by sublimating the pre-filled air or gas activator can be obtained. Operate the cylinder mechanism using
The contact opening mechanism is set to the open state, whereby the battery is disconnected from the wire harness or the like, and burnout due to short-circuit of the wire harness at the time of collision can be prevented.

Further, in the power supply cutoff device according to the second aspect, the battery and the wire harness are cut off based on the detection result of the air bag acceleration sensor for detecting that the vehicle has collided, and the wire at the time of the collision is cut off. Burnout due to short-circuiting of the harness can be prevented.

Further, in the power cutoff device according to the third aspect, when a vehicle collides, the battery is disconnected from the wire harness or the like, and the circuit cutoff state is mechanically held until the release operation is performed. Until the accident handling is completed, prohibit power supply to wire harness etc.
Safety can be improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an example of an electric system of an automobile using an embodiment of a power supply cutoff device according to the present invention.

FIG. 2 is a perspective view showing a detailed configuration example of the power cutoff device shown in FIG.

FIG. 3 is a cross-sectional view showing a detailed configuration example of the power cutoff device shown in FIG.

FIG. 4 is a cross-sectional view showing an operation example of the power cutoff device shown in FIG.

FIG. 5 is a cross-sectional view showing another embodiment of the power cutoff device according to the present invention.

FIG. 6 is a cross-sectional view showing an operation example of the power cutoff device shown in FIG.

FIG. 7 is a perspective view showing another embodiment of the power cutoff device according to the present invention.

FIG. 8 is a cross-sectional view illustrating a detailed configuration example of the power cutoff device illustrated in FIG. 7;

9 is a cross-sectional view illustrating an operation example of the power cutoff device illustrated in FIG. 7;

FIG. 10 is a circuit diagram showing an example of an electrical system provided in an automobile.

[Explanation of symbols]

1: electrical system, 2: negative terminal, 3: battery, 4: positive terminal, 5: power cutoff device, 6: electric wire,
7: wire harness, 8: large capacity fuse, 9: load, 10: medium capacity fuse, 11: coil, 12: contact, 13: relay, 14, 15: electric wire, 16: board, 1
7: recess, 18: driving force generating mechanism, 19: cylinder, 2
0: cylinder mechanism, 21: contact opening mechanism, 22: air tank, 23: air valve, 24: gas filling unit, 2
5: female connector, 26: male connector, 27: connector, 28: electric wire, 29: hole, 30: low melting point alloy, 3
1: heater, 32: hole, 33: cylindrical member, 34: gas inlet, 35: pin, 36: closing member, 37: compression spring, 3
8: screw hole, 39: cylinder cylinder, 40, 41: large diameter portion,
42, 43: O-ring, 44: flange, 45: shaft,
46: long hole, 47: spring stopper, 48: compression spring, 4
9: latch groove, 50, 51: latch groove, 52: latch claw, 53: leaf spring, 54: hole, 55: air hole, 56: electrode holding portion, 57: electric wire, 58: large diameter portion, 59: multi Contact, 60: electrode holding portion, 61: electric wire, 62: large diameter portion, 63: multi-contact, 70, 71: electrode, 7
3: peripheral groove, 74: multi-contact, 101: power cutoff device, 102: substrate, 103: concave portion, 104: driving force generation mechanism, 105: cylinder mechanism, 106: contact opening mechanism, 107: gas generation chamber, 108: Nozzle, 109: cylinder, 110: cap, 111: gas activator, 112
113: terminal, 114: heater wire, 115: band, 1
16: spacer, 117: shaft, 118, 119:
Circumferential groove, 120, 121: O-ring, 122: reset valve, 123: reset knob, 124: large diameter portion, 12
5: stopper plate, 126: large diameter portion, 127: reset spring, 128: through hole, 129: terminal, 1
30: electrode holding cylinder, 131: multi-contact, 13
2: band, 133: through hole, 134: terminal, 1
35: electrode holding cylinder, 136: multi-contact, 13
7: band, 138: gap

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Goro Nakamura 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture Inside Yazaki Parts Co., Ltd.

Claims (3)

[Claims] 1. A power supply that is interposed in a circuit that connects a battery of a vehicle and loads provided in various parts of the vehicle and that cuts off a circuit when a circuit cutoff signal is input and stops power supply to each load. In the apparatus, a driving force generating mechanism fixed to the body side of the vehicle and ejecting a gas obtained by sublimating the filled air or gas activator when a circuit cutoff signal is supplied, and fixed to the body. A cylinder mechanism that slides a cylinder or a shaft when air or gas is supplied from the driving force generating mechanism; and when the cylinder or the shaft of the cylinder mechanism is not slid, the cylinder and the load move between the battery and each of the loads. Electrically connected, electrically disconnect between the battery and each load when the cylinder or shaft slides And a contact opening mechanism. 2. The power cutoff device according to claim 1, wherein the circuit cutoff signal is an airbag ignition signal output from a sensor that detects a collision of the vehicle. 3. The power cutoff device according to claim 1, wherein the cylinder mechanism or the contact opening mechanism mechanically maintains the operation completion state once the operation is completed until the return processing is completed. Power cutoff device.