JP2549576Y2 - Electrical connection device between dissimilar metals - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an electrical connection between dissimilar metals for electrically connecting dissimilar metals to each other, such as a copper alloy ground terminal at the end of a wire harness in an automobile and an aluminum body. It concerns the device.

[0002]

2. Description of the Related Art Generally, a vehicle has a body connected to a negative side of a battery for the purpose of obtaining a shielding effect. In a wiring process of a wire harness, a ground circuit of each load is dropped to the body to simplify a ground circuit. It is trying to make it.

[0003] Also, a method is generally employed in which the ground terminal of an automobile is mainly made of a copper alloy, one end of which is connected to a wire harness and the other end is bolted to the body.

[0004]

[Problems to be Solved by the Invention] In recent years, the automobile industry has been working on weight reduction as a part of measures for improving fuel efficiency. Has been put to practical use.

However, since the earth terminal on the wire harness side is made of a copper alloy and the body side is made of aluminum, it is bonded to dissimilar metals. there were.

Accordingly, the applicant of the present application has proposed Japanese Utility Model Application Laid-Open No. 3-5 / 1993 to prevent electrolytic corrosion at an electrical connection portion between dissimilar metals.
No. 0773 proposed an electrical connection terminal for electrically connecting different kinds of metals. That is, as shown in FIG. 7, an earth bracket 103 as an electric connection terminal for connecting an aluminum mounting base 101 on the aluminum body side and an earth wire 102 on the wire harness side to each other is disclosed. This earth bracket 10
Reference numeral 3 denotes one attachment member 105 made of an aluminum plate material fastened to the mounting base 101 with a bolt 104 and the other attachment made of a brass plate material detachably connected to an earth holder 106 accommodating a group of earth wires 102. A member 107 is provided, and one end of each of the attachment members 105 and 107 is joined and fixed to each other in a superposed state, and a resin waterproof protective layer 108 is formed by molding so as to cover the joint between the dissimilar metals. I have.

However, this ground bracket 10
According to the structure 3, the attachment members 105 and 107 are joined to each other at the middle portion in the length direction of the ground bracket 103, and the joining strength needs to be increased to withstand external stress. For this reason, the joining area is increased, the size is increased, and the range of the waterproof protective layer 108 for preventing water intrusion is wide.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems and the problems in the prior art, and has as its object to provide an electric connection device between dissimilar metals which can effectively secure the bonding strength, and can achieve miniaturization and prevention of electrolytic corrosion. With the goal.

[0009]

A first technical means for achieving the above object is that bolts are connected to each other by interposing an electric connection terminal between a first metal and a second metal as dissimilar metals. An electrical connection device between dissimilar metals, wherein the electrical connection terminal is made of the same metal or a similar metal as the first metal, and has a bolt-shaped insertion hole in the center of the washer-shaped first connection terminal; A second joint terminal made of the same metal or the same kind of metal as the second metal and having a bolt insertion hole in the center, and having a washer-shaped second joint terminal;
A flange portion is formed on the outer peripheral surface on one end side of each of the joint terminals, and the flange-side end surfaces of both joint terminals are in contact with each other, and the other end surface side of each of the joint terminals is formed as an externally projecting shape. Are joined to each other by a resin waterproof protective body that covers the outer periphery in a liquid-tight manner in the circumferential direction. It is in the point of becoming.

A second technical means is an electric connection device between dissimilar metals in which a first metal and a second metal as dissimilar metals are bolted to each other with an electric connection terminal unit interposed therebetween. The electrical connection terminal unit comprises:
A pair of electric connection terminals, a resin holding frame for holding the both electric connection terminals at a predetermined interval, the electric connection terminals being made of the same metal or the same kind of metal as the first metal, and A first joining terminal having a bolt insertion hole and a washer-shaped second joining terminal made of the same or similar metal as the second metal and having a bolt insertion hole in the center. A flange portion is formed so as to protrude from an outer peripheral surface on one end side of each of the terminal and the second joint terminal. The two joining terminals are connected to each other by a resin waterproof protective body that covers both flange portions in a liquid-tight manner in the circumferential direction, and either one of the first metal or the second metal inserted between the two electrical connection terminals is connected to the other. If the same metal The connection terminals made of the same type of metal are opposed to each other, each of the electric connection terminals is held by the holding frame, and the one metal is inserted between the two electric connection terminals of the electric connection terminal unit. The point is that the connection terminal on the outer side of the connection terminal is in contact with the other metal and is bolted to each other.

[0011]

According to the present invention, the first metal is joined to the first joint terminal of the electrical connection terminal, and the second metal is joined to the second joint terminal of the electrical connection terminal. Alternatively, even when water is interposed between the same type of metals, generation of a potential difference can be suppressed and electrolytic corrosion can be prevented.

The joint between the first joint terminal and the second joint terminal is made of a dissimilar metal, but water can be prevented by the waterproof protective body made of resin, and electrolytic corrosion can be prevented.

Further, since the electrical connection terminal is interposed between the first metal and the second metal and is bolted to each other, the first
The joining strength between the joining terminal and the second joining terminal can be effectively secured, and as a result, the electrical contact stability can be improved, so that the joining area can be made smaller, the size and weight can be reduced, and the water stoppage can be achieved. Reliability can also be improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 6 show an automobile having a body 1 made of aluminum as a first metal and a wire harness 2 provided at an end portion thereof. The electrical connection device 4 between the earth terminal 3 as a second metal and the earth terminal 3 is shown. Since the ground terminal 3 is connected to the copper wire 2a of the wire harness 2, the ground terminal 3 is formed of a copper alloy, for example, a brass plate material as in the related art.

The electric connection device 4 includes a pair of electric connection terminals 6, the connection terminals 6 being a pair of a first joint terminal 7, a second joint terminal 8, and a resin connecting the two joint terminals 7, 8 to each other. And a waterproof protection member 9 made of water. The first joining terminal 7 is made of an aluminum material made of the same kind of metal as the body 1, and is formed in an annular terminal body 7 a formed in a washer shape and radially outwardly protruding from an outer peripheral surface on one end side of the terminal body 7 a. The flange portion 7b is formed in a rectangular shape as shown in FIG. The center is a bolt insertion hole 7c. The second joint terminal 8 is made of a brass material made of the same kind of metal as the ground terminal 3.
A terminal body 8a having a bolt insertion hole 8c formed in the same shape corresponding to the above, and a flange portion 8b.

As shown in FIG.
It is composed of a pair of case frames 9a formed of a resin such as polypropylene, acrylic, polyamide, or vinyl chloride, and each case frame 9a has a fitting recess 9b in which the terminal bodies 7a and 8a are fitted. And a fitting groove 9c into which the flanges 7b and 8b are fitted. The flange portions 7b, 8b of the joint terminals 7, 8 are in contact with each other, and the flange portions 7b, 8b are fitted into the fitting grooves 9c of the case frames 9a. At this time, FIG.
As shown in FIG. 2, a sealant 10 made of a silicon-based adhesive or the like is applied between the outer surface sides of the flange portions 7b and 8b and the inner surface side of the fitting groove 9c, and each case frame 9a is sealed. It is adhered by the agent 10. Here, the first joint terminal 7 and the second joint terminal 8 are connected to both flange portions 7 by a waterproof protection body 9.
b, 8b are liquid-tightly covered in the circumferential direction and connected to each other. The other end surfaces of the terminal bodies 7a and 8a are formed to protrude outside from the fitting recess 9b, and the outer shape of the waterproof protection body 9 is square.

The sealant 10 is also applied to the inner peripheral surfaces of the bolt insertion holes 7c and 8c of the joint terminals 7 and 8.

As shown in FIGS. 1, 5 and 6, the electrical connection device 4 includes a resin holding frame 12 formed in a U-shape in side view, and the holding frame 12 is made of polypropylene or vinyl chloride. A pair of holding grooves 12a into which the electric connection terminals 6 are fitted are formed at a predetermined interval.

Then, a pair of electric connection terminals 6 are fitted into the holding grooves 12a of the holding frame 12 with the second joining terminals 8 facing each other. At this time, the two electric connection terminals 6 are held by the holding grooves 12a by frictional force, and the distance between the two second connection terminals 8 is configured to be substantially the same as the thickness of the ground terminal 3.
Here, the electrical connection terminal unit 13 is configured. Next, the ground terminal 3 is inserted between the two second joining terminals 8, and as shown in FIGS. 1 and 6, one of the first joining terminals 7 side inserts an aluminum material into the bolt insertion holes 3a, 7c, 8c. Bolt 14 is inserted and fastened to a nut 15 made of aluminum material which is welded to the body 1 in advance. By this fastening, the other first joint terminal 7 and the body 1 are joined, and the second joint terminal 8 and the ground terminal 3 are joined.
And the ground terminal 3 and the body 1 are electrically connected to each other to form a ground circuit.

The embodiment of the present invention is configured as described above, and the joint between the body 1 and the first joint terminal 7 and the joint between the bolt 14 and the first joint terminal 7 are each made by joining aluminum materials. In addition, since the bonding between the ground terminal 3 and the second bonding terminal 8 is a bonding between brass materials, the same kind of metal is bonded to each other, and the generation of a potential difference can be prevented even when water is interposed. The occurrence of electrolytic corrosion can be effectively prevented.

The joint between the first joint terminal 7 and the second joint terminal 8 is formed by joining dissimilar metals of aluminum and brass. Water is prevented from entering by a sealant 10 and a waterproof protection body 9. It is possible to effectively prevent electrolytic corrosion.

Further, by fastening the bolt 14, the insides of the bolt insertion holes 3a, 7c, 8c are sealed, and the intrusion of water into the inside is effectively prevented.

Further, the first connection terminal 7 and the second connection terminal 8 of the electrical connection terminal 6 are pressed against each other by fastening the bolt 14, so that it is difficult to receive external stress and the joining strength is effectively improved by fastening the bolt 14. As a result, electrical contact stability can be improved. As a result, the joining area can be further reduced, the size and weight can be reduced, the area covered by the waterproof protection body 9 can be reduced, and the reliability of water stoppage can be improved. Furthermore, the above-mentioned miniaturization allows effective use of space and improves versatility.

Further, the electric connection device 4 according to the embodiment of the present invention has an advantage that the ground terminal 3 used for the current wire harness 2 can be used as it is.

Further, the pair of electric connection terminals 6 is
The workability is also improved because the electrical connection terminal unit 13 held in the position 2 is assembled.

The ground terminal 3 is provided between the two electrical connection terminals 6.
In the case where a large amount of gaps are generated when fitting is made, a spacer made of brass material may be appropriately interposed. Although a structure in which a nut 15 is welded to the body 1 is shown, a boss is provided on the body 1, a female screw is formed in the boss, and a bolt 14 is fastened to the female screw. You may. Further, the first joint terminal 7 and the second joint terminal 8 are shown using the same kind of metal as the body 1 and the ground terminal 3, respectively. However, the same kind of metal such as the same kind of metal alloy may be used. Also, a structure using an electric connection terminal unit 13 in which a pair of electric connection terminals 6 are held by a holding frame 12 is shown, but the first joint terminal 7 of the single electric connection terminal 6 is placed on the body 1 side. Alternatively, the bolt 14 may be fastened by contacting the ground terminal 3 with the second joint terminal 8. At this time, a washer or the like made of an insulating material may be interposed between the head of the bolt 14 and the ground terminal 3.
Furthermore, although the structure in which the waterproof protection body 9 is composed of a pair of case frames 9a is shown, a method of integrally molding may be used.

In the above embodiment, the structure implemented in the earth circuit of the automobile is shown. However, the invention may be implemented in a connection between different kinds of metals to be electrically connected.

[0028]

As described above, according to the electrical connection device between dissimilar metals of the present invention, the first connection terminal of the first metal and the electrical connection terminal, and the connection of the second metal and the electrical connection terminal. The second joining terminals are respectively joined to the same kind of metal or the same kind of metal, so that electrolytic corrosion can be effectively prevented. In addition, since the joint between the first joint terminal and the second joint terminal is covered with a waterproof protective body in a liquid honey-like manner, intrusion of water can be prevented,
Electric corrosion can be effectively prevented also in this portion. Further, the electrical connection terminal is interposed between the first metal and the second metal and bolted to each other, so that the bonding strength between the first connection terminal and the second connection terminal can be effectively secured, and the electrical connection The contact stability can be improved, and the contact stability can be improved, so that the joining area can be made smaller, the size and weight can be reduced, and the reliability of water stoppage can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view of an electric connection terminal.

FIG. 3 is a central sectional view of an electric connection terminal.

FIG. 4 is an exploded perspective view of an electric connection terminal.

FIG. 5 is an exploded perspective view of the electric connection terminal unit.

FIG. 6 is a perspective view showing an attached state.

FIG. 7 is an exploded perspective view showing an example of the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 3 Earth terminal 4 Electric connection device 6 Electric connection terminal 7 First joint terminal 7b Flange part 7c Bolt insertion hole 8 Second joint terminal 8b Flange part 8c Bolt insertion hole 9 Waterproof protective body 12 Holding frame 13 Electric connection terminal unit 14 volts

Claims (2)

(57) [Scope of request for utility model registration] 1. An electric connection device between different metals, which is bolted to each other with an electric connection terminal interposed between a first metal and a second metal as dissimilar metals, wherein the electric connection terminal is A washer-shaped first joining terminal made of the same metal or similar metal as the first metal and having a bolt insertion hole in the center, and a second metal made of the same metal or similar metal and having a bolt insertion hole in the center. And a washer-shaped second joint terminal having a flange portion formed on one end side outer peripheral surface of each of the first joint terminal and the second joint terminal. The flange portion side end surfaces of both joint terminals are in contact with each other. The two connecting terminals are connected to each other by a waterproof waterproof body made of resin that covers both flange portions in a liquid-tight manner in the circumferential direction, and the first connecting terminal and the first metal. , And the first Connecting terminals and electrically connecting device between dissimilar metals which is characterized by comprising a bolt fastened to each other the second metal as the respective contact form. 2. An electric connection device between dissimilar metals, wherein a first metal and a second metal as dissimilar metals are bolted to each other with an electric connection terminal unit interposed therebetween, wherein the electric connection terminal unit is A pair of electrical connection terminals,
A resin-made holding frame for holding both electric connection terminals at a constant interval, wherein the electric connection terminals are made of the same metal or similar metal as the first metal, and have a washer-like shape having a bolt insertion hole in the center. , And a washer-shaped second joint terminal made of the same or similar metal as the second metal and having a bolt insertion hole at the center thereof. Each of the first joint terminal and the second joint terminal A flange portion is formed so as to protrude on the outer peripheral surface on one end side, and the flange portion side end surfaces of both joint terminals are in contact with each other, and the other end surfaces of each joint terminal are externally projecting, and both flange portions are circumferentially formed. The two joining terminals are connected to each other by a resin waterproof protection body that covers in a liquid-tight manner, and is made of the same metal or the same kind of metal as either the first metal or the second metal inserted between the two electric connection terminals. The electrical connection terminals are held by the holding frame with the joining terminal sides facing each other, the one metal is fitted between the electrical connection terminals of the electrical connection terminal unit, and the outer side of the one electrical connection terminal Characterized in that said joining terminals are in contact with the other metal and are bolted to each other.