JP2008074220A - Conductor breaking structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductor breaking structure capable of breaking a conductor for feeding on-vehicle apparatus from a power source by a simple structure, and forcibly stopping feeding, in collision of a vehicle. <P>SOLUTION: A first holding portion 11 holding a fixing plate 21 of the conductor 2 and a lower portion 221 of a coupling plate 22, and a second holding portion 12 holding an upper portion 222 of the coupling plate 22 of the conductor 2 and a connecting plate 23, are made by synthetic resin, and respectively fixed to a vehicle body 311 of a vehicle 31 through a space 13 so as to be adjacent in a pressure collapse direction (a hollow arrow direction) of the vehicle 31. With the pressure collapse of the vehicle body 311 which collided with an article of the outside, the holding portions 11, 12 come close to each other in the arrow direction so as to narrow the space 13. At that time, the lower portion 221 held by the first holding portion 11 and the upper portion 222 held by the second holding portion 12 relatively move in the opposite direction each other. The coupling plate 22 is formed with a recessed portion 22a on a vertical direction center portion and brittle, so that the coupling plate 22 is broken, and feeding is forcibly stopped. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a conductor fracture structure for forcibly stopping power supply from a power source to an in-vehicle device when a vehicle collides.

  In the event of a collision, a conductor (for example, a conductor) between the power supply and the in-vehicle device is short-circuited, causing overcurrent, and overheating, fire, etc. There has been proposed a device that automatically performs a safe operation for forcibly stopping the operation (see Patent Document 1).

The vehicle safety device disclosed in Patent Document 1 includes a main fuse member interposed between a power source and an in-vehicle device when a collision detection unit using an acceleration sensor, a vehicle speed sensor, or the like detects a collision. The power supply is stopped by forcibly cutting off the explosives.
Japanese Patent Laid-Open No. 10-324207

However, since the safety device described in Patent Document 1 needs to include a collision detection unit and a cutting unit that cuts the main fuse member using explosives, the configuration is complicated and expensive.
Furthermore, for example, when the collision detection unit malfunctions and the cutting unit is activated, a separate unit for quickly returning the power supply that has been forcibly stopped is required, which further complicates the configuration.

  The present invention has been made in view of such circumstances, and a main object thereof is to provide two holding portions for holding conductors arranged in a direction crossing the crushing direction with the crushing of the vehicle at the time of a collision. It is to provide a conductor fracture structure in which the power supply can be forcibly stopped by breaking the conductor for power supply with a simple configuration by adopting a structure that relatively approaches the crushing direction.

  Another object of the present invention is to provide a conductor breaking structure in which a conductor can be easily broken because a part of the conductor is formed weakly.

  Another object of the present invention is to provide a conductor breaking structure that can suppress unnecessary breaking of a conductor at the time of non-collision by adopting a configuration in which two holding portions are adjacent to each other with an elastic member interposed therebetween. is there.

  Still another object of the present invention is that the conductor is arranged in the axial direction of the central portion in the radial direction of the two cylindrical holding portions that are arranged on the inside of the other one on the inside of the other. Another object of the present invention is to provide a conductor breaking structure capable of breaking a conductor even if the crushing direction of the vehicle at the time of collision is various.

  The conductor breaking structure according to the first aspect of the present invention is a conductor breaking structure that forcibly stops power feeding by breaking a conductor for feeding power from a power source to an in-vehicle device when the vehicle collides. The vehicle is crushed between two non-conductive holding portions that are fixed to the vehicle adjacent to the crushing direction and hold the conductors so that the conductors are arranged in a direction crossing the crushing direction. Accordingly, a space is provided for the two holding portions to relatively approach in the crushing direction.

  The conductor fracture structure according to the second invention is characterized in that at least a part of the conductor between the two holding parts is formed more fragile than the other part.

  The conductor fracture structure according to the third invention is characterized in that an elastic member is arranged in the space.

  In the conductor fracture structure according to a fourth aspect of the present invention, the two holding portions have a cylindrical shape, one of which is arranged inside the other through the space and is erected on the vehicle, respectively, The two holding portions are arranged in the axial direction of the central portion in the radial direction.

In the first invention, the non-conductive first holding part (second holding part) that holds a part (other part) of the conductor for supplying power from the power source to the in-vehicle device is a part of the vehicle. It is fixed to (other part). The first holding part and the second holding part are arranged adjacent to each other in the crushing direction of the vehicle at the time of a collision, and the conductors held by the two holding parts are arranged in a direction crossing the crushing direction.
A space is provided between the first holding unit and the second holding unit so that the first holding unit and the second holding unit relatively approach each other in the crushing direction as the vehicle is crushed. . That is, the first holding part and the second holding part are arranged through the space so as to be adjacent to each other in the crushing direction of the vehicle.

When the vehicle collides, as the vehicle is crushed, the first holding unit and the second holding unit relatively approach each other in the crushing direction so as to narrow the space.
Since the conductors held by the two holding portions are arranged in a direction crossing the crushing direction, a part of the conductor held by the first holding portion and the second holding portion are held. The other part of the conductor moves relative to each other in the opposite direction, and a large shearing force is applied to the conductor between the two holding parts to break the conductor.
In this manner, the power supply is forcibly stopped by breaking the conductor for supplying power from the power source to the in-vehicle device when the vehicle collides.

When the vehicle is crushed by a collision, the two holding portions adjacent to each other through the space in the vehicle crushing direction automatically approach each other. For this reason, the conductors held by the two holding portions are automatically and easily broken when the vehicle is crushed by a collision. That is, neither detection means for detecting a collision nor breakage means having a complicated configuration for breaking the conductor is required.
Further, when the vehicle is not crushed due to a collision, the two holding portions are automatically restrained from relatively approaching, so that the conductor is prevented from being unnecessarily broken. That is, malfunction of the conductor breakage structure is suppressed.

Furthermore, since each of the two holding portions is non-conductive, it is possible to prevent a short circuit of the conductor from occurring, for example, via the conductive holding portion after the conductor is broken.
Furthermore, since each of the two holding portions holds the broken conductor, the broken portion of the conductor is prevented from coming into contact with another conductive portion (for example, the vehicle body) and short-circuiting.

In the second invention, a part of the conductor is formed fragile. For this purpose, a part of a conductor using a conductive wire, a metal piece or the like is formed in a state where it is cut out in advance or corroded to such an extent that it does not interfere with power feeding.
When the vehicle collides, the first holding part and the second holding part relatively approach each other in the crushing direction so as to narrow the space as the vehicle is crushed, and at this time, between the two holding parts. A large shearing force is applied to the conductor. Since at least a part of the conductor between the two holding parts is formed more fragile than the other part, the fragile part of the conductor is easily broken.

  It is sufficient that a part or all of the conductors arranged between the two holding parts are formed more weakly than the other parts, and all the conductors for supplying power from the power source to the in-vehicle device. Need not be fragile. For this reason, when an unexpected external force is applied to the conductor, the conductor is prevented from breaking unnecessarily.

In the third invention, the elastic member is arranged in a space for the two holding portions to relatively approach in the crushing direction as the vehicle is crushed. That is, the first holding part and the second holding part are arranged via the elastic member so as to be adjacent to each other in the crushing direction of the vehicle.
If there is no elastic member (when there is only a gap between the two holding parts), the two holding parts are unnecessarily relatively approached by applying a small external force when there is no collision. It is conceivable that an unnecessary fracture occurs.

However, by interposing the elastic member, the elastic restoring force of the elastic member cancels out the small external force applied to the vehicle, so that the two holding portions are restrained from unnecessarily approaching each other. Unnecessary breakage is suppressed.
Then, when a large external force exceeding the elastic restoring force of the elastic member is applied to the vehicle as in the case of a collision, the elastic member is contracted and the two holding portions relatively approach each other. As a result, the conductor breaks.

In the fourth aspect of the invention, the cylindrical second holding part for holding the other part of the conductor is disposed inside the cylindrical first holding part for holding a part of the conductor. It is erected. Such two holding parts are arranged adjacent to each other in the crushing direction at the time of collision, and the two holding parts relatively approach each other in the crushing direction as the vehicle is crushed between the two holding parts. Intervening space.
That is, the radial direction of the two holding portions is substantially equal to the crushing direction.
The conductors held by the two holding portions are arranged in a direction crossing the crushing direction, and are arranged in the axial direction of the central portion in the radial direction of the two holding portions.
That is, the axial direction of the two holding portions is substantially equal to the direction intersecting the crushing direction.

When the vehicle collides, as the vehicle is crushed, the two holding portions relatively approach each other in the radial direction of the two holding portions so as to narrow the space.
Since the conductors held by the two holding parts are arranged in the axial direction of the two holding parts, a part of the conductors held by the two holding parts move relative to each other in the opposite directions. A large shearing force is applied to the conductor between the two holding portions, and the conductor breaks.

In the case of the conductor breaking structure of the first invention, it is not necessary to have a collision detecting means using an acceleration sensor, a vehicle speed sensor, etc., a breaking means for breaking the main fuse member using explosives, etc., with a simple and inexpensive configuration, The power supply can be forcibly stopped by breaking the conductor for supplying power from the power source to the in-vehicle device.
In addition, the conductor breaking structure of the present invention is prevented from malfunctioning in situations other than when the vehicle collides and is crushed, so there is no need for a means for returning the power supply that was forcibly stopped at the time of malfunction. It is.

  As a result, the conductor breaking structure of the present invention is such that even when the vehicle collides, the conductor between the power source and the vehicle-mounted device is short-circuited to cause overcurrent, and overcurrent, overheating, fire, etc. It is possible to suppress the occurrence of this problem with a very simple configuration. In other words, the conductor breaking structure can function as a safety device with a very simple configuration that automatically performs a safety operation when a collision occurs.

  In the conductor breakage structure of the second invention, since a necessary and sufficient part of the conductor is formed weakly, the conductor can be easily broken, and unnecessary breakage of the conductor can be suppressed.

  According to the conductor breaking structure of the third invention, since the elastic member is interposed between the first holding part and the second holding part, unnecessary breaking of the conductor can be suppressed at the time of non-collision. As a result, the conductor fracture structure can function as a highly reliable safety device with a simple configuration.

  In the case of the conductor fracture structure of the fourth invention, the space for the two cylindrical holding portions to relatively approach each other is interposed in the radial direction of the two holding portions, so that the direction of the vehicle crushing at the time of the collision is The conductor can be broken not only in one direction but also in various ways.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.

Embodiment 1.
FIG. 1 is a plan view showing a configuration of a conductor fracture structure 1 according to Embodiment 1 of the present invention, and FIG. 2 is a side view of the same. FIG. 3 is a cross-sectional view taken along line III-III in FIG.
In the conductor breaking structure 1, when the vehicle 31 collides with an external object, the vehicle power source (specifically, a battery mounted in an engine room (not shown) of the vehicle 31) B is mounted on the vehicle (for example, a power steering device (not shown)). The power supply is forcibly stopped by breaking the conductor 2 for supplying power to the power source.

Such a conductor breaking structure 1 is provided, for example, between the battery negative terminal and the vehicle body 311 of the vehicle 31, or between the battery positive terminal and the fuse box.
Below, the case where the conductor fracture | rupture structure 1 is provided between a battery minus terminal and the vehicle body 311 is illustrated. For simplicity, it is assumed that the direction closer to the surface is down and the direction far from the surface is up in the direction perpendicular to the surface of the vehicle body 311.

One end of the conductive wire 20 is connected to the negative side of the power supply B. The battery negative terminal includes a conductor 2 disposed on the other end of the conducting wire 20.
The conductor 2 is a modified Z-shaped metal piece connected to the conducting wire 20 via the connection portion 200, and is grounded to the conductive vehicle body 311 for grounding the power supply B.
More specifically, the conductor 2 is formed by integrally forming a rectangular flat plate-shaped fixing plate 21, a connecting plate 22, and a connecting plate 23 by bending one elongated rectangular flat plate-shaped metal member into a modified Z-shape. It becomes.

The fixing plate 21 is screwed and fixed to the surface of the conductive vehicle body 311 using a screw 21b at one side, and a connecting plate 22 is raised from the other side facing the one side.
The connection plate 23 is arranged substantially parallel to the fixed plate 21 and not directly facing the fixed plate 21, the connecting plate 22 hangs down from one side, and the other side facing the one side is the connection unit 200. Is directly connected to.
That is, the connecting plate 22 is arranged substantially perpendicular to the fixing plate 21 arranged on one surface side of the connecting plate 22 and the connecting plate 23 arranged on the other surface side of the connecting plate 22. It is connected.

  In the connecting plate 22, a notch-shaped concave strip portion 22 a is formed substantially in parallel with each of the fixed plate 21 and the connecting plate 23 at the center in the vertical direction on one side of the connecting plate 22. For this reason, the connecting plate 22 is weak in the portion where the concave portion 22a is formed as compared with the fixing plate 21 and the connecting plate 23, and is easily broken.

As shown in FIGS. 1 to 3, the conductor breaking structure 1 includes a non-conductive first holding portion 11 and a second holding portion 12 that hold the conductor 2 on the surface of the vehicle body 311, and screws 11 b and 11 b. , 12b, 12b. However, illustration of various screws is omitted in FIG.
The vehicle body 311 is a member that absorbs an impact by being easily crushed when the vehicle 31 collides with an external object (for example, an impact absorbing frame disposed on the front, rear, or side of the vehicle 31). In particular, crushing is likely to occur in the direction of the white arrow shown in FIG. 3 (one direction along the surface of the vehicle body 311; hereinafter referred to as the crushing direction).

  Each of the holding portions 11 and 12 is made of a synthetic resin, and has a strength that is difficult to be destroyed by a collision of the vehicle 31.

  The first holding portion 11 is arranged on the downstream side in the crushing direction, the front surface (the surface on the upstream side in the crushing direction) is U-shaped, the plane and the side surface are rectangular, and the fixing plate 21 and the connecting plate 22 of the conductor 2. The lower portion 221 of the head. More specifically, the first holding unit 11 holds the fixing plate 21 by tightly surrounding the fixing plate 21 between the U-shaped inner side and the surface of the vehicle body 311. The first holding part 11 is disposed in close contact with the lower part 221 of one surface of the connecting plate 22 (the surface on the downstream side in the crushing direction). For this reason, even if the car body 311 is crushed in the direction of the white arrow, the displacement of the fixing plate 21 and the lower part 221 of the connecting plate 22 such as displacement from the fixing position with respect to the car body 311 or lifting from the surface of the car body 311 occurs. It is suppressed.

  The second holding portion 12 is arranged on the upstream side in the crushing direction, the flat surface and the front surface are rectangular, the side surface is L-shaped to be inverted with respect to the surface of the vehicle body 311, and the upper portion 222 of the connecting plate 22 of the conductor 2. And the connection plate 23 are held.

More specifically, the second holding portion 12 has an inverted L-shaped one side (specifically, a side standing upright on the surface of the vehicle body 311) 121 penetrated by the screws 12 b and 12 b and formed on the surface of the vehicle body 311. Screwed. In addition, the second holding portion 12 has a part of the connecting plate 23 and an upper portion 222 of the connecting plate 22 substantially sealed on the other side 122 of the inverted L-shape (specifically, the side parallel to the surface of the vehicle body 311) 122. The remaining portion of the connection plate 23 protruding from the inverted L-shaped bent portion and the connection portion 200 are integrally provided.
Then, the connection plate 22 hangs from the vicinity of the tip of the other side 122 of the inverted L-shaped second holding portion 12.

That is, the two holding portions 11 and 12 are fixed to the vehicle body 311 of the vehicle 31 adjacent to each other in the crushing direction at the time of the collision, and the connecting plate of the conductor 2 in a direction intersecting the crushing direction of the vehicle body 311 of the vehicle 31. Each of the conductors 2 is held so that 22 is arranged.
The holding portions 11 and 12 hold the fixing plate 21 and the lower portion 221 and the upper portion 222 of the connecting plate 22 and the connection plate 23, and further, the concave portion 22a is formed to thereby form two holding portions. The center part of the up-down direction of the connection board 22 distribute | arranged between 11 and 12 is formed more weakly than the other part.

A space 13 is provided between the first holding unit 11 and the second holding unit 12 so that the two holding units 11 and 12 relatively approach each other in the crushing direction as the vehicle body 311 of the vehicle 31 is crushed. It has been.
More specifically, the first holding portion 11 is spaced apart from the inside of the inverted L-shape of the second holding portion 12, and the first holding portion 11 and the upstream surface of the first holding portion 11 in the crushing direction are separated from each other. A space 13 is interposed between a surface on the downstream side in the crushing direction of the one side 121 of the second holding portion 12.
For this reason, when the vehicle 31 collides and the vehicle body 311 is crushed by the white arrow in FIG. 3, the one side 121 of the second holding unit 12 approaches relatively to the first holding unit 11. That is, the second holding unit 12 narrows the space 13 in the direction of the arrow in FIG.

FIG. 4 is a longitudinal sectional view for explaining the breaking of the conductor 2 by the conductor breaking structure 1.
Due to the relative approach of the two holding portions 11 and 12 when the vehicle 31 collides, the second holding portion 12 is displaced from the position of the two-dot chain line in FIG. 4 to the position of the solid line. For this reason, the holding portions 11 and 12 come into contact with each other and the space 13 is lost, or the holding portions 11 and 12 relatively approach each other up to a close distance, and the space 13 becomes extremely small.

The connecting plate 22 of the conductor 2 is arranged in a direction substantially perpendicular to the crushing direction, and the lower portion 221 of the connecting plate 22 held by the first holding unit 11 is not displaced, but the second holding unit 12 is not displaced. Since the upper part 222 of the connecting plate 22 held by the base plate is displaced, the lower part 221 and the upper part 222 try to move relative to each other in the opposite directions, and a large shearing force is applied to the connecting plate 22, particularly the central part in the vertical direction of the connecting plate 22. Added.
Furthermore, a notch-shaped concave strip portion 22a is formed in the central portion of the connecting plate 22 in the vertical direction (see FIG. 3). Since the connecting plate 22 is weaker in the portion where the concave portion 22a is formed than the other portions, the connecting plate 22 of the conductor 2 is easily broken at the position where the concave portion 22a is formed, as shown in FIG. The lower part 221 and the upper part 222 are separated along the crushing direction.

  When the vehicle 31 collides with an external object, the breakage of the connecting plate 22 is automatically generated as the vehicle body 311 is crushed. Therefore, special means for breaking the conductor 2 (for example, the collision of the vehicle 31) A means for breaking the conductor 2 with explosives when detected is unnecessary.

  After the connecting plate 22 is broken, the fixing plate 21 side connected to the vehicle body 311 and the connecting plate 23 side connected to the power source B are held by the non-conductive holding portions 11 and 12 respectively. Yes. For this reason, it is suppressed that the connection plate 23 side connected to the power source B is short-circuited via the holding portions 11 and 12 and that the connection plate 23 side abuts against the vehicle body 311 or the fixed plate 21 side.

In the conductor breakage structure 1 as described above, the grounding of the power supply B is lost and the power supply from the power supply B to the in-vehicle device is forcibly stopped by the breakage of the connecting plate 22 and the conductor 2 of the battery negative terminal. . That is, the conductor fracture structure 1 functions as a power shut-off component when the vehicle 31 is in an accident.
Further, the concave portion 22a forming portion which is a fragile portion of the conductor 2 is disposed between the first holding portion 11 and the second holding portion 12 having a strength that is difficult to be destroyed by the collision of the vehicle 31. Therefore, the breakage due to unnecessary external force excluding the external force at the time of collision is suppressed.

Further, the vehicle body 311 which is a shock absorbing frame is more easily crushed at the time of collision than the other parts of the vehicle 31, so that the two holding portions 11 and 12 can be easily moved relative to each other when the vehicle body 311 which collided is crushed. As a result, the conductor 2 is easily broken.
Furthermore, when the vehicle body 311 is not crushed, the holding portions 11 and 12 are relatively close to each other and the conductor 2 is broken, that is, malfunction of the conductor breaking structure 1 is suppressed.

Embodiment 2. FIG.
FIG. 5 is a perspective view showing the configuration of the conductor fracture structure 4 according to Embodiment 2 of the present invention, and FIG. 6 is a longitudinal sectional view of the same. 7 and 8 are plan views showing the configurations of the first holding portion 41 and the second holding portion 42 provided in the conductor breaking structure 4. Further, FIG. 9 is a partially enlarged longitudinal sectional view for explaining the breaking of the conductor 5 by the conductor breaking structure 4.
Similarly to the conductor breakage structure 1 of the first embodiment, the conductor breakage structure 4 supplies power by breaking the conductor 5 for supplying power from the power source B to the vehicle-mounted device when the vehicle 32 collides with an external object. Configured to force stop.

However, the conductor breaking structure 1 of the first embodiment is used when the crushing direction of the vehicle body 311 of the vehicle 31 is one direction in principle, but the conductor breaking structure 4 of the present embodiment is the vehicle body 321 of the vehicle 32. This is used when the crushing direction is not limited to one direction.
In the following, for the sake of simplicity, it is assumed that the direction close to the surface is down and the direction far from the surface is up in the direction perpendicular to the surface of the vehicle body 321.

On the negative side of the power source B, one end of a conductor 5 made of a metal wire covered with a non-conductive synthetic resin is connected.
The conductor 5 is grounded to the vehicle body 321 by fixing a portion of the metal wire from which the synthetic resin coating is removed to the conductive vehicle body 321 with a screw 5b for grounding the power source B.

The conductor 5 is arranged in a deformed Z-shape as shown in FIG. 6 by being held by the two holding portions 41 and 42. The modified Z-shaped one end 51 of the conductor 5 is fixed to the vehicle body 321, the other end 53 is directly connected to the power source B, and the intermediate portion 52 between the one end 51 and the other end 53 is the vehicle body 321. It is arranged substantially perpendicular to the surface of. Moreover, as shown in FIG. 9A, a cutout V-shaped groove 52 a is formed in the circumferential direction of the intermediate portion 52 in the intermediate portion 52 of the conductor 5. Here, the V-shaped groove 52 a is formed in a metal wire through the synthetic resin coating constituting the conductor 5.
For this reason, the intermediate part 52 of the conductor 5 is weaker than the one end part 51 and the other end part 53, and easily breaks at the V-shaped groove 52a forming part.

As shown in FIGS. 5 and 6, the conductor breaking structure 4 includes a non-conductive first holding portion 41 and a second holding portion 42 that hold the conductor 5 on the surface of the vehicle body 321, and screws 41 b and 41 b. , 42b.
The vehicle body 321 is a member that absorbs an impact by being easily crushed when the vehicle 32 collides. For example, the vehicle body 321 is easily crushed in the directions indicated by white arrows A1, A2, A3, A4,. That is, the crushing of the vehicle body 321 is not limited to one direction along the surface of the vehicle body 321, and can occur in a plurality of different directions along the surface of the vehicle body 321.

  Each of the holding portions 41 and 42 is made of a synthetic resin, and has a strength that is difficult to be destroyed by a collision of the vehicle 32. The first holding portion 41 (second holding portion 42) is a bottomed cylinder that is inverted with respect to the surface of the vehicle body 321, as shown in FIGS. 6 and 7 (FIGS. 5, 6, and 8). In order to fix the first holding portion 41 (second holding portion 42) to the vehicle body 321, the rectangular flat plate-like protruding plate 411 (the protruding plate 421) is formed from the outer peripheral surface in the vicinity of the opening of the bottomed cylindrical portion. ) Projecting substantially parallel to the bottom of the bottomed cylindrical portion.

Further, in the first holding portion 41, a rectangular flat plate-like protruding plate 412 protrudes from the inner peripheral surface in the vicinity of the opening of the bottomed cylindrical portion in a direction substantially the same as the protruding direction of the protruding plate 411. .
Furthermore, the second holding portion 42 has a notch-like concave portion 422 having a dimension corresponding to the lateral width (length in a direction orthogonal to the protruding direction) and the thickness of the protruding plate 411 on the opening peripheral edge of the bottomed cylindrical portion. Is formed adjacent to the protruding plate 421.

Conductor openings 413 and 423 having an inner diameter substantially the same as the outer diameter of the conductor 5 are formed at the bottom center of the bottomed cylindrical portion of each of the holding portions 41 and 42.
Further, a screw opening 414 for screwing the protruding plate 421 at a position facing the protruding plate 421 is provided at the bottom of the bottomed cylindrical portion of the first holding portion 41 at a position facing the protruding plate 421. Is formed.

  The diameter of the outer peripheral surface of the first holding portion 41 (hereinafter referred to as the outer diameter of the first holding portion 41) is the diameter of the inner peripheral surface of the second holding portion 42 (hereinafter referred to as the second holding portion 42). The outer method of the bottomed cylindrical portion in the axial length direction of the first holding portion 41 (hereinafter referred to as the depth of the bottom outer surface of the first holding portion 41) is smaller than the inner diameter). This is substantially the same as the inner method of the bottomed cylindrical portion in the longitudinal direction (hereinafter referred to as the depth of the bottom inner surface of the second holding portion 42). However, the protruding length of the protruding plate 411 is longer than the difference between the radius of the outer peripheral surface of the first holding portion 41 and the radius of the inner peripheral surface of the second holding portion 42.

The holding parts 41 and 42 as described above correspond to the holding parts 11 and 12 of the first embodiment, but the conductor fracture structure 4 is different from the conductor fracture structure 1 of the first embodiment in that the inner diameter is the first. A ring-shaped elastic member (for example, a ring member made of synthetic rubber, silicon, or the like) 44 is provided which is substantially equal to the outer diameter of the holding portion 41 and whose outer diameter is substantially equal to the inner diameter of the second holding portion 42.
The elastic member 44 is easily compressed against a large external force that is generated when the vehicle 32 collides. However, the elastic member 44 cancels out the external force due to the elastic restoring force of the elastic member 44 and hardly compresses the external force due to the small external force generated during non-collision, for example, the vibration generated when the vehicle 32 travels.

Hereinafter, assembly of the conductor fracture structure 4 will be described.
The operator inserts the conductor 5 into the conductor openings 413 and 423 of the holding portions 41 and 42 from the bottom outer surface side to the bottom inner surface side of the holding portions 41 and 42 from the one end portion 51 side of the conductor 5. 51 is screwed to the vehicle body 321 with a screw 5b. At this time, the height of the V-shaped groove 52a of the conductor 5 from the surface of the vehicle body 321 is substantially equal to the depth of the bottom outer surface of the first holding portion 41 (or the depth of the bottom inner surface of the second holding portion 42). Thus, the arrangement position of the screw 5b is adjusted. Here, the conductor openings 413 and 423 of the holding portions 41 and 42 are aligned by the insertion of the conductor 5.

  Next, the operator makes the opening of the first holding portion 41 the vehicle body 321 side and screws the screw 5b to the vehicle body 321 with the screws 41b and 41b. In this case, the operator performs screwing on the protruding plate 412 through the screw opening 414.

Further, the worker fits the elastic member 44 on the outer peripheral surface of the first holding part 41.
Then, the operator sets the opening of the second holding portion 42 to the vehicle body 321 side, and fits the protruding plate 411 of the first holding portion 41 into the concave portion 422 of the second holding portion 42 to hold the holding portion 41. 42, and the projecting plate 421 is screwed to the vehicle body 321 with screws 42b.

  At this time, a space 43 in which the elastic member 44 is disposed is provided between the outer peripheral surface of the first holding portion 41 and the inner peripheral surface of the second holding portion 42. Further, the conductor 5 is held by the holding portions 41 and 42 in a modified Z shape. Further, as shown in FIG. 9A, the V-shaped groove 52 a of the conductor 5 is arranged between the bottom outer surface of the first holding portion 41 and the bottom inner surface of the second holding portion 42. The lower part 521 (upper part 522) of the intermediate part 52 of the conductor 5 is surrounded and held by the conductor opening 413 of the first holding part 41 (conductor opening 423 of the second holding part 42) via 52a. .

A space 43 between the first holding part 41 and the second holding part 42 is provided so that the two holding parts 41 and 42 relatively approach each other in the crushing direction as the vehicle body 321 of the vehicle 32 is crushed. ing. In addition, an elastic member 44 is disposed in the space 43, and the cylindrical portion of the first holding portion 41 and the cylindrical portion of the second holding portion 42 are arranged on the vehicle body 321 so as to be adjacent to each other via the elastic member 44. Has been.
The two holding parts 41 and 42 have a bottomed cylindrical shape, and the first holding part 41 is arranged inside the second holding part 42 through the space 43 and is respectively attached to the vehicle body 321 of the vehicle 32. The intermediate portion 52 of the conductor 5 is disposed in the axial direction of the central portion in the radial direction of the two holding portions 41 and 42.

Since the first holding portion 41 is fixed to the vehicle body 321 at two points by screws 41b and 41b, occurrence of displacement of the first holding portion 41 along the surface of the vehicle body 321 is suppressed.
On the other hand, since the second holding portion 42 is fixed to the vehicle body 321 at one point by the screw 42b, the second holding portion 42 can swing (swing) along the surface of the vehicle body 321 with the screw 42b as the center position. That is, the bottomed cylindrical portion of the second holding portion 42 can be displaced in an arc shape.

  For this reason, when the vehicle 32 collides and the vehicle body 321 is crushed, the cylindrical portion of the second holding portion 42 comes closer to the cylindrical portion of the first holding portion 41. At this time, the elastic member 44 is partially compressed between the outer peripheral surface of the first holding portion 41 and the inner peripheral surface of the second holding portion 42, and the space 43 corresponding to the compression portion of the elastic member 44 is narrowed. .

  As a result, the lower portion 521 and the upper portion 522 of the intermediate portion 52 of the conductor 5 try to move relative to each other in opposite directions, and a large shearing force is applied to the intermediate portion 52. Since the V-shaped groove 52a is formed in the intermediate portion 52, and the intermediate portion 52 is weaker in the portion where the V-shaped groove 52a is formed than the other portions, the intermediate portion 52 of the conductor 5 is shown in FIG. ), It is easily broken at the position where the V-shaped groove 52a is formed.

Similarly to the conductor rupture structure 1 of the first embodiment, the conductor rupture structure 4 as described above loses the ground of the power source B when the conductor 5 is ruptured, and the power supply from the power source B to the in-vehicle device is forcibly stopped. The That is, the conductor breaking structure 4 functions as a power shut-off component at the time of an accident of the vehicle 32.
In addition, due to the interposition of the elastic member 44, the relative approach of the holding portions 41 and 42 is suppressed during non-collision, and unnecessary breakage of the conductor 5 is suppressed. As a result, the conductor fracture structure 4 functions as a highly reliable safety device with a simple configuration.

In addition, you may interpose an elastic member also in the space 13 in the conductor fracture | rupture structure 1 of Embodiment 1. FIG.
For example, instead of forming the V-shaped groove 52a, a blade for cutting the conductor 5 may be disposed in the conductor openings 413 and 423.

It is a top view which shows the structure of the conductor fracture structure which concerns on Embodiment 1 of this invention. It is a side view which shows the structure of the conductor fracture structure which concerns on Embodiment 1 of this invention. It is sectional drawing of the III-III line in FIG. It is a longitudinal cross-sectional view explaining the fracture | rupture of the conductor by the conductor fracture structure which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the conductor fracture structure which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view which shows the structure of the conductor fracture structure which concerns on Embodiment 2 of this invention. It is a top view which shows the structure of the 1st holding | maintenance part with which the conductor fracture | rupture structure which concerns on Embodiment 2 of this invention is provided. It is a top view which shows the structure of the 2nd holding | maintenance part with which the conductor fracture | rupture structure which concerns on Embodiment 2 of this invention is provided. It is a partial expanded longitudinal cross-sectional view explaining the fracture | rupture of the conductor by the conductor fracture structure which concerns on Embodiment 2 of this invention.

Explanation of symbols

1, 4 Conductor breaking structure 11, 12, 41, 42 Holding part 13, 43 Space 2, 5 Conductor 31, 32 Vehicle 44 Elastic member B Power source

Claims (4)

When the vehicle collides, it is a conductor breaking structure that forcibly stops feeding by breaking the conductor for feeding power from the power source to the in-vehicle device,
Between two non-conductive holding parts that are fixed to the vehicle adjacent to the crushing direction of the vehicle at the time of collision and hold the conductors so that the conductors are arranged in a direction crossing the crushing direction. And a space for the two holding portions to relatively approach in the crushing direction as the vehicle is crushed.   The conductor fracture structure according to claim 1, wherein at least a part of the conductor between the two holding parts is formed to be weaker than the other part.   The conductor breaking structure according to claim 1, wherein an elastic member is disposed in the space. The two holding portions have a cylindrical shape, one of which is arranged inside the other through the space, and each of which is erected on the vehicle,
The conductor breaking structure according to any one of claims 1 to 3, wherein the conductor is arranged in an axial direction of a radial center portion of the two holding portions.

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