JP2009107542A - Panel structure and grounding system of mobile body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a panel structure for realizing a stable contact resistance value and a grounding system of a mobile body, in the mobile body having a main body constituted by combining prescribed panels. <P>SOLUTION: This panel structure is mounted on the mobile body. The panel structure includes a carbon panel and a connecting part. The connecting part electrically connects the other end of an earth wire having one grounded end to the carbon panel. By the connection, the carbon panel is grounded via the connecting part and the earth wire, and thereby the resistance value becomes stable to be grounded via the carbon panel. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a panel structure and a grounding system for a moving body, and more particularly to a panel structure and a grounding system for a moving body main body such as a vehicle.

  Conventionally, there is a system that supplies electric power from a battery mounted on a moving body such as a vehicle to an electric load via a power supply line. For example, as shown in FIG. 4, electric power is supplied from a battery 5 mounted on the vehicle to an electric load 7 via a power line. Here, a current monitoring unit 6 is provided on the power supply line from the battery 5 to the electric load 7. The current monitoring unit 6 monitors the current state from the battery 5 to the electric load 7 and cuts off the power supply to the electric load 7 when an overcurrent, a short-circuit current, or the like flows. For example, the current monitoring unit 6 is configured by a fuse or the like that melts or cuts off when a current of a predetermined value or more flows. Providing such a current monitoring unit 6 can prevent damage to the system due to overcurrent or short-circuit current.

On the other hand, generally, in order to stabilize the operation of the electric load mounted on the vehicle, the electric load is grounded. For example, each electrical device is grounded by being electrically connected to a vehicle body formed of a conductive panel such as iron. There is also a structure that facilitates grounding of electrical equipment by attaching a grounding member to a non-conductive member of a vehicle (see, for example, Patent Document 1). In the ground attachment structure disclosed in Patent Document 1, an electrical device is grounded by providing a ground member on a non-conductive member member such as a synthetic resin disposed in a vehicle.
JP 2004-276647 A

  However, when the vehicle body is configured with a carbon panel or the like having a certain degree of conductivity, the current monitoring method described above may become unstable. For example, as shown in FIG. 4, a plurality of carbon panels 10a to 10c are connected to constitute a vehicle body, and a part of them (the carbon panel 10b in the example of FIG. 4) and the power line are short-circuited. Think about the case. In this case, the electrical resistance value of the connection portion may vary from the initial value due to a change with time of the connection portion between the carbon panels 10a to 10c. Therefore, as shown in FIG. 4, when the power supply line and the carbon panel 10b are short-circuited, the resistance value until the power supply line is grounded via the carbon panels 10a to 10c becomes unstable. The protection system against overcurrent and short circuit current may not function. As a result, problems such as inability to supply sufficient electric power to the electric load 7, a decrease in the amount of electricity stored in the battery 5, damage to the power supply line, heating of the connection portions of the carbon panels 10a to 10c and the panel itself may occur. is there. Further, even if the structure disclosed in Patent Document 1 is used, since the ground member is attached to the non-conductive member of the vehicle, such a structure for a vehicle body such as a carbon panel having a certain degree of conductivity is used. Cannot solve the problem.

  Therefore, an object of the present invention is to provide a panel structure that realizes a stable contact resistance value and a grounding system for the moving body in a moving body in which a main body is configured by combining predetermined panels.

In order to achieve the above-described object, the present invention has the following features.
1st invention is the panel structure mounted in a moving body. The panel structure includes a carbon panel and a connection portion. The connecting portion electrically connects the other end of the ground wire whose one end is grounded to the carbon panel.

  In a second aspect based on the first aspect, the connecting portion includes an insert and a fixing member. Part of the insert is embedded in the carbon panel. The fixing member is joined to the insertion body, and clamps the ground terminal provided at the other end of the ground wire to fix the ground terminal to the insertion body.

  In a third aspect based on the second aspect, the insert is an insert nut partially embedded in a carbon panel. The fixing member is a bolt that is screwed into the insert nut. The ground terminal is clamped and fixed between the end of the insert nut protruding from the surface of the carbon panel and the bolt.

  In a fourth aspect based on the second aspect, the insert is a stud bolt partially embedded in a carbon panel. The fixing member is a nut that is screwed with the stud bolt.

  5th invention is the earthing | grounding system mounted in a moving body. The grounding system includes a carbon panel, a ground wire, and a connection part. One end of the ground wire is grounded. The connecting portion electrically connects the other end of the ground wire and the carbon panel.

  In a sixth aspect based on the fifth aspect, a plurality of carbon panels are connected and mounted in the moving body. The connecting portion is provided on each of the plurality of carbon panels. A plurality of ground wires are provided, one end of each is grounded, and the other end is electrically connected to a connection portion provided in each of the plurality of carbon panels.

  According to the first aspect, since the carbon panel is grounded via the connection portion and the ground wire, the resistance value until the carbon panel is grounded via the carbon panel is stabilized. The resistance value varies very little from the initial value due to changes over time. Therefore, when the carbon panel and the power supply line are short-circuited, the resistance value from the power supply line to the ground via the carbon panel is stable, so the protection system against overcurrent and short-circuit current functions effectively. . Moreover, since the resistance value until it is grounded is stable, the carbon panel can be positively used for grounding each electric device.

  According to the second aspect of the present invention, since the electrical resistance value between the insert and the carbon panel is stable and the deterioration is extremely small, the electrical conductivity until the grounding from the carbon panel through the ground wire changes with time. Can be suppressed.

  According to the said 3rd invention, a connection part can be easily comprised by insert-molding an insert nut and forming a carbon panel, or press-fitting an insert nut in the boss hole of a carbon panel.

  According to the fourth aspect of the present invention, the connecting portion can be easily configured by insert molding the stud bolt to form a carbon panel or by embedding the stud bolt after the carbon panel molding.

  According to the fifth aspect, since the carbon panel is grounded via the connection portion and the ground wire, the resistance value until the carbon panel is grounded via the carbon panel is stabilized. The resistance value varies very little from the initial value due to changes over time. Therefore, since the resistance value until it is grounded is stable, the grounding system of the moving body can be constructed by positively using the carbon panel for grounding each electric device. In addition, when the carbon panel and power supply line are short-circuited, the resistance value from the power supply line to grounding via the carbon panel is stable, so the protection system against overcurrent and short-circuit current functions effectively. It becomes a grounding system.

  According to the sixth aspect of the invention, when the movable body main body or the like is configured by connecting a plurality of carbon panels, the plurality of carbon panels are grounded via the ground wires. Therefore, even if the electrical resistance value of the connecting portion between the carbon panels changes, the resistance value until grounding through the carbon panel can be stabilized.

  Hereinafter, a panel structure and a grounding system according to an embodiment of the present invention will be described with reference to FIG. Typically, a panel included in the panel structure constitutes a part of a moving body main body such as a vehicle, and the grounding system is mounted in the moving body. FIG. 1 is a schematic configuration diagram illustrating a configuration example of a panel structure and a grounding system constituting the vehicle main body, taking a vehicle as an example.

  In FIG. 1, a plurality of panels 1a to 1c are combined to constitute a vehicle body. For example, the panels 1a to 1c are carbon panels each having a certain degree of conductivity, and are hereinafter referred to as carbon panels 1a to 1c. The carbon panels 1a to 1c are connected to ground wires 3a to 3c and grounded to the ground plate 8, respectively. In addition, the structure of the connection part 2a-2c which connects the carbon panels 1a-1c and the earth wires 3a-3c, respectively, and the detailed structure of the connection part which connects between the carbon panels 1a-1c are mentioned later. In addition, when the carbon panels 1a to 1c, the connection portions 2a to 2c, and the ground wires 3a to 3c are generically referred to, they will be referred to as the carbon panel 1, the connection portion 2, and the ground wire 3 in the following description.

  In addition, a system for supplying electric power from a battery to each electric load via a power line is mounted in the vehicle. In the example of FIG. 1, electric power is supplied from the battery 5 mounted on the vehicle to the electric load 7 through the power line. The battery 5 and the electric load 7 are grounded to the ground plate 8 respectively. Further, a current monitoring unit 6 is provided on the power line from the battery 5 to the electric load 7. The current monitoring unit 6 monitors the current state from the battery 5 to the electric load 7 and cuts off the power supply to the electric load 7 when an overcurrent, a short-circuit current, or the like flows. For example, the current monitoring unit 6 is configured by a fuse or the like that melts or cuts off when a current of a predetermined value or more flows.

  With reference to FIG. 2 and FIG. 3, the structure of the connection parts 2a-2c and the structure of the connection part which connects between the carbon panels 1a-1c are demonstrated. FIG. 2 is a side view showing the structure of the carbon panels 1a to 1c having the connecting portions 2a to 2c. FIG. 3 is a side sectional view showing an example of a detailed structure of the connecting portion 2a. In FIG. 2, only the connection portions 2 a and 2 b are illustrated among the connection portions 2 a to 2 c illustrated in FIG. 1.

  In FIG. 2, carbon panels 1 a to 1 c are resinous plate-like members containing carbon therein, and are members having a certain degree of conductivity (for example, 0 to 500 mΩ (milliohm)). For example, the carbon panels 1a to 1c are connected to each other and used for parts on the vehicle body structure of the vehicle, panels inside the vehicle body, interior parts, and the like.

  Carbon panel 1a and carbon panel 1b are fastened by rivets 4ab. Moreover, the carbon panel 1b and the carbon panel 1c are fastened by rivets 4bc. An adhesive is applied to the surface where the carbon panel 1a and the carbon panel 1b are in contact with each other and the surface where the carbon panel 1b and the carbon panel 1c are in contact with each other. Here, the rivets 4ab and 4bc have a shaft portion and heads at both ends of the shaft portion when mounted on the carbon panels 1a to 1c. Specifically, the rivets 4ab and 4bc have their respective head portions inserted into holes formed in the end portions of the carbon panels 1a to 1c, and the shaft ends of the shaft portions are caulked. Form a joint. In the example shown in FIG. 2, the carbon panels 1a to 1c are fastened using the rivets 4ab and 4bc, but the carbon panels 1a to 1c may be connected using other members. For example, the carbon panels 1a to 1c may be fastened using bolts or nuts instead of the rivets 4ab and 4bc.

  Connection portions 2a to 2c are portions that electrically connect carbon panels 1a to 1c and ground wires 3a to 3c, respectively. For example, as shown in FIG. 2, the connecting portion 2a includes an insert nut 21a and a bolt 22a. The connecting portion 2b includes an insert nut 21b and a bolt 22b. And earth terminal 31a and 31b are crimped | bonded to the carbon panel side front-end | tip of earth wire 3a and 3b, respectively. In addition, since the structures of the connection portions 2a to 2c are the same, the structure of the connection portion 2a will be described as a representative with reference to FIG. In addition, when the insert nuts 21a to 21c, the bolts 22a to 22c, and the ground terminals 31a to 31c are collectively referred to as the insert nut 21, the bolt 22, and the ground terminal 31, respectively.

  In FIG. 3, the insert nut 21 a is made of a metal such as brass, stainless steel, aluminum alloy, or iron, and has an internal thread that opens at least on one end face side. Further, the insert nut 21a is formed with a collar portion on the other end side for preventing the insert nut 21a from falling off the carbon panel 1a. The insert nut 21a is insert-molded and fixed in the carbon panel 1a when the carbon panel 1a is molded. At this time, a part of the insert nut 21a on the one end face side (that is, the female screw opening side) is exposed from the surface of the carbon panel 1a, and the other part is embedded in the carbon panel 1a for insert molding. The

  The ground terminal 31a is crimped to one end of the ground wire 3a. The ground terminal 31b is fastened and fixed to the one end face of the insert nut 21a by a bolt 22a. The bolt 22a fixes the ground terminal 31a to the insert nut 21a by sandwiching a predetermined washer and the ground terminal 31a and screwing with a female screw of the insert nut 21a.

  Thus, the ground wire 3a is connected to the carbon panel 1a via the insert nut 21a. Therefore, the carbon panel 1a is electrically grounded to the ground plate 8 (see FIG. 1). Similarly, ground wires 3b and 3c are connected to carbon panels 1b and 1c via insert nuts 21b and 21c, respectively. Therefore, the carbon panels 1b and 1c are also electrically grounded to the ground plate 8, respectively.

  Note that the above-described insert nut 21 is prevented from falling off the carbon panel 1 by forming a flange portion on the other end side, but may be prevented from falling off in other modes. For example, grooves, vertical streaks (flat stitches), lattice-shaped streaks (twist eyes), or the like may be formed on the side surface of the insert nut 21 to prevent the carbon nut 1 from falling off.

  Moreover, although the insert nut 21 mentioned above is insert-molded and fixed when the carbon panel 1 is molded, it may be fixed to the carbon panel 1 by other methods. For example, the insert nut 21 may be press-fitted or heat-fitted into a boss hole formed in the carbon panel 1 and the insert nut 21 may be fixed to the carbon panel 1.

  Further, instead of the insert nut 21 described above, a stud bolt may be fixed to the carbon panel 1. In this case, the ground terminal 31 is fixed to the stud bolt by a nut screwed with the stud bolt. As a first example, the ground terminal 31 is sandwiched between the nut and the surface of the carbon panel 1 and fixed to the stud bolt. As a second example, the ground terminal 31 is sandwiched between a ring-shaped member loosely penetrated by a stat bolt and the nut and fixed to the stud bolt. As a third example, the ground terminal 31 is sandwiched between two nuts that are screwed to the stat bolt and fixed to the stud bolt. Even when the stud bolt is fixed to the carbon panel 1 in this way, the ground wire 3 is connected to the carbon panel 1 via the stud bolt.

  Thus, since the carbon panel 1 according to the embodiment is grounded via the connection portion 2 and the ground wire 3, the resistance value until the carbon panel 1 is grounded via the carbon panel 1 is stabilized. The resistance value varies very little from the initial value due to changes over time. For example, when the carbon panel 1b and the power supply line (see FIG. 1) are short-circuited, the resistance value until the carbon panel 1b is grounded via the carbon panel 1b from the power supply line is stable. The protection system works effectively. Specifically, when the carbon panel 1b and the power supply line are short-circuited, a current exceeding a threshold assumed by the current monitoring unit 6 to distinguish overcurrent and short-circuit current flows. The protective function works reliably. For example, when the current monitoring unit 6 is formed of a fuse, the fusible body is surely blown by a short-circuit current greater than or equal to the threshold value, and power supply from the battery 5 to the electric load 7 is stopped.

  Moreover, since the resistance value until the carbon panel 1 which concerns on the said embodiment is earth | grounded is stable, it can also be used actively for earthing | grounding of each electric equipment. That is, similarly to a conventional vehicle body composed of a conductive panel made of iron or the like, each electrical device can be easily grounded by electrically connecting the electrical device mounted on the vehicle to the carbon panel 1. it can.

  In the above description, an example in which the panel structure and the grounding system according to the embodiment are installed in a vehicle is used. However, the panel structure and the grounding system of another moving body on which a power source and an electric device are mounted are used. It does not matter if it is For example, the panel structure and grounding system of the present invention can be used for various moving bodies such as airplanes and ships, in addition to vehicles such as passenger cars, large vehicles, and motorcycles.

  Although the present invention has been described in detail above, the above description is merely illustrative of the present invention in all respects and is not intended to limit the scope thereof. It goes without saying that various improvements and modifications can be made without departing from the scope of the present invention.

  The panel structure and grounding system according to the present invention can stabilize the resistance value until grounding through the panel, and can be applied to a panel structure such as a moving body on which a power source and electric equipment are mounted, a grounding system, and the like.

Schematic configuration diagram showing a configuration example of a panel structure and a grounding system according to an embodiment of the present invention The side view which shows the structure of carbon panel 1a-1c which has the connection parts 2a-2c of FIG. Side sectional view which shows an example of the detailed structure of the connection part 2a of FIG. Schematic configuration diagram showing a configuration example of a conventional panel structure and grounding system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Carbon panel 2 ... Connection part 21 ... Insert nut 22 ... Bolt 3 ... Ground wire 31 ... Ground terminal 4 ... Rivet 5 ... Battery 6 ... Current monitoring part 7 ... Electric load 8 ... Ground plate

Claims (6)

A panel structure mounted on a moving body,
Carbon panels,
A panel structure comprising: a connecting portion for electrically connecting the other end of the ground wire whose one end is grounded to the carbon panel. The connecting portion is
An insert part of which is embedded in the carbon panel;
The panel structure according to claim 1, further comprising: a fixing member that is joined to the insert and sandwiches a ground terminal provided at the other end of the ground wire to fix the ground terminal to the insert. The insert is an insert nut partially embedded in the carbon panel,
The fixing member is a bolt screwed into the insert nut;
The panel structure according to claim 2, wherein the ground terminal is sandwiched and fixed between an end of the insert nut protruding from the surface of the carbon panel and the bolt. The insert is a stud bolt partially embedded in the carbon panel,
The panel structure according to claim 2, wherein the fixing member is a nut screwed into the stud bolt. A grounding system mounted on a moving body,
Carbon panels,
An earth wire with one end grounded,
A grounding system comprising: a connecting portion that electrically connects the other end of the ground wire and the carbon panel. A plurality of the carbon panels are connected and mounted in the moving body,
The connecting portion is provided on each of the plurality of carbon panels,
The said earthing | grounding wire is provided with two or more, Each one end is earth | grounded, Each other end is electrically connected with the said connection part provided in each of these carbon panels. Grounding system.

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