JP2002078159A - Electric parts mounting structure and junction box having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a stable mounting state of electric parts with degassing property secured. SOLUTION: A degassing indentation 17 communicated through a terminal hole 16 is formed on a mounting surface in a circuit board 13 in which a bus bar 14 is coated with insulated resin 15. The degassing indentation 17 is formed in a shape of extending an opening as far as outside from the visible outline of a main body casing 21 of a relay 20 when installing a relay. While emitting gas G occurring in soldering through the degassing indentation 17, an area contacting with the circuit board 13 is increased so as to secure a stable mounting structure even in the event of occurrence of vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric component mounting structure and a junction box provided with the mounting structure, and more particularly, to mounting an electric component such as a relay on a bus bar by soldering in a modularized junction box. Things.

[0002]

2. Description of the Related Art In recent years, with the rapid increase of electrical components mounted on automobiles, the number of electric junction boxes for automobiles, especially the circuits accommodated in junction boxes, has rapidly increased, and branch circuits are formed at high density. In addition, the number of parts is very large, and the number of assembling steps is very large.

In a junction box 1 shown in FIG. 7 of the electric connection box for automobiles, bus bars 5A to 5D are stacked and arranged between upper case 2 and lower case 3 with insulating plates 4A to 4E interposed therebetween. Upper case 2
Is provided with a connector housing 2a, a relay housing 2b, and a fuse housing 2c, and a connector 6, a relay 7, and a fuse 8 are mounted in these housings, and these terminals and the terminals protruding from the bus bar are directly or directly connected to each other. They are connected via relay terminals. The lower case 3 is also provided with a connector accommodating portion 3a, and the terminal 5a of the bus bar is protruded and connected to the connector.

[0004]

In the junction box 1, there is a problem that the area of the bus bar and the number of laminations increase as the number of circuits increases, and the junction box becomes large. When a connector housing, a relay housing, and a fuse housing are provided in both the upper case and the lower case, and the connector, relay, fuse and the internal circuit are connected to the upper and lower surfaces of the junction box, the upper case or It is possible to suppress an increase in the area of the junction box as compared with a case where the junction box is provided only on one side of the lower case.

However, if the connector accommodating portion and the relay accommodating portion or the fuse accommodating portion are provided at the upper and lower opposing positions, the terminals refracted by the bus bar overlap and cannot be deployed. Therefore, it is necessary to provide the terminal on the bus bar of another layer. This causes the number of layers to increase. As described above, when the number of stacked bus bars increases, the height of the junction box increases, and the size of the junction box increases.

Further, since the connector, the fuse, and the relay are connected to the bus bar in the junction box, if the specification changes to change the connection between the fuse, the relay and the internal circuit, the entire internal circuit is changed. And it cannot easily cope with circuit changes.

In view of the above situation, if the bus bars connected to the connector, the relay, and the fuse are separately arranged in a region, it is possible to cope with an increase in the number of bus bar layers due to the overlap of terminals provided on the bus bar. Also, if the connector connection circuit section, the relay connection circuit section, and the fuse connection circuit section are each modularized, it is often possible to use the same even in different models and grades. Furthermore, in the relay connection circuit section where there are few circuit changes, if the bus bar and the terminal of the relay are directly connected, the relay terminal can be eliminated and the bus bar does not need to be provided with terminals and tabs. Can be shared.

Regarding the connection between the bus bar and the relay,
Modularization creates a circuit section dedicated to the relay, so mounting the relay on the bus bar can take advantage of the modularization. Soldering is generally considered as a method of this mounting.

For example, as shown in FIG.
The terminal 7b of the main body case 7a of the relay 7 is inserted into the terminal hole 9c of the circuit board 9 in which is molded with an insulating resin 9b, and the square leg 7 on the bottom surface of the main body case 7a also shown in FIG.
c is placed on the circuit board 9 and a gap S
A method is considered in which the terminal portion 7b is connected to the bus bar 9a with solder H in a state where the space is left open.

Here, the gap S is provided as described above in order to release gas generated from the molten solder at the time of soldering. If the gas is not released, pores such as pinholes are generated inside the solder. This is due to insufficient mounting strength and poor conduction. In addition, the formation of the gap S is not limited to the above,
As shown in FIG. 10, a gap S may be formed by providing a spacer portion 7d 'at the protruding base of the terminal 7b' of the relay 7 '.

However, in the method shown in FIG. 8, since the leg 7c itself is small, the contact area in contact with the upper surface of the circuit board 9 is limited to only the lower surface of the leg 7c. Therefore, since the main body case 7a including the contact opening / closing mechanism such as a relay has a large mass, the vibration accompanying the running of the automobile is also transmitted to the relay 7, and the soldered portion becomes the center of vibration and the main body case 7a becomes large. Vibration causes a problem that such vibration cannot be prevented by contacting only with the leg 7c.

The above vibration also occurs in the method shown in FIG. 10, and the square on the bottom surface of the main body case 7a 'is not in contact with the circuit board 9;
There is a problem that a ′ easily falls into a state of shaking the head, and a load is applied to the soldered portion between the bus bar and the terminal.
In particular, the modularized circuit board has a small board area, so vibrations are easily amplified, and various stresses such as bending are applied to the soldered part, which may cause peeling of the solder, thereby deteriorating the reliability of conduction. There is a problem to do.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the circuit in the junction box is modularized into a connector connection circuit section, a relay connection circuit section, and a fuse connection circuit section. It is an object of the present invention to suppress the increase in the number of stacked busbars accommodated in a semiconductor device, to reduce the thickness of the junction box, and to easily cope with circuit changes.
It is another object of the present invention to solve the above-described problem that occurs when the modularized bus bar and an electric component such as a relay are connected by soldering.

[0014]

According to the present invention, an electric component is mounted on a circuit board on which a bus bar is resin-molded, and terminals of the electric component are formed on the circuit board. It is inserted into the terminal hole and connected to the bus bar by soldering, and on the electric component mounting surface of the circuit board, a gas vent recess communicating with the terminal hole and opening outward from the outline of the electric component is provided, An electric component mounting structure is provided, in which gas generated during soldering is released through the gas vent recess.

As described above, when the gas venting recess is formed on the mounting surface of the circuit board, the gas can be released without providing a gap between the electric component and the circuit board as in the related art. In other words, the electric component does not have a leg portion or a spacer on the terminal in the main body case, and when the terminal is inserted into the terminal hole, the lower surface of the main case comes into contact with the mounting surface of the circuit board. The depression is open to the outside of the outline of the electric component. Therefore, even if the terminal hole is closed by the electric component as described above, the terminal hole communicates with the outside through the gas release recess, so that the gas can be reliably discharged.

Further, as described above, the electric components themselves are:
Since the entire lower surface of the main body case is in contact with the circuit board, the contact area is greatly increased compared to the conventional case, and the stability is increased.
No stress is applied to the soldered portion, and vibration resistance can be improved. In addition, since it is not necessary to provide the legs and the spacers for the electric components to be attached, the cost for manufacturing and the like can be reduced.

The gas venting recesses provided in communication with the respective terminal holes are formed on the non-opposite sides of the terminal holes, and gradually become shallower from the terminal holes toward the mounting surface. In this way, when the gas venting recess is formed, the gas can be released in the shortest distance from the terminal hole of the circuit board, and further, if the depth of the recess is formed as described above, the gas flows smoothly, Gas emission efficiency can be increased.

It is necessary to provide at least one gas vent for one terminal hole. However, in order to improve gas escape, a plurality of gas vents are provided for one terminal hole. Alternatively, a plurality of gas venting dents provided in one electric component may be communicated with each other to enhance gas venting properties.

The above-mentioned electric components correspond to relays, connectors, and the like. Relays including a main body case having a large weight, and connectors connected to wire harness terminals are susceptible to vibration, and may be bent at soldered portions. Although the stress tends to be generated, by applying the above structure, the adverse effect due to the vibration can be prevented and the connection reliability can be maintained.

According to the present invention, there is provided a junction box having the above-mentioned electric component mounting structure, wherein the junction box comprises a connector connection circuit, a fuse connection circuit, and a relay connection circuit which are accommodated in an upper case and a lower case. Is divided and provided separately as a connector module, a fuse module, and a relay module, and an end of a bus bar integrated with the insulating resin of each of the modules is protruded to form a welded portion. On the other hand, each module is joined by overlapping and welding the welded portions of the fuse module and the relay module, and in the relay module, the electric component consisting of a relay is mounted on a bus bar molded in the resin and soldered. Junction box characterized by being connected It provides a scan.

As described above, the circuit in the junction box is modularized as a connector connection circuit section, a relay connection circuit section, and a fuse connection circuit section, thereby suppressing an increase in the number of bus bars accommodated in the junction box. Therefore, the junction box can be made thinner, and the circuit can be easily changed. Furthermore, since such a modularized circuit section has a small circuit area by providing the mounting structure for the electric component, the circuit section is secured against vibration even on a circuit board on which vibration is easily amplified, and the reliability of the circuit is improved. Can also be maintained.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an exploded state of a modularized junction box 10 having a mounting structure according to an embodiment of the present invention. The junction box 10 includes an internal circuit housed in the upper case 10a and the lower case 10b,
Divided as fuse connection circuit section and relay connection circuit section,
The connector module 11, the fuse module 25, and the relay module 12 are modularized.

In each of the above modules, the end of the bus bar integrated with the insulating plate or the like is formed as a welded portion by projecting from the end of the insulating plate or the like. The connector module 11 is a welded portion 11a for a fuse protruding from the periphery. Are overlapped and welded to the welded portion 25a of the fuse module 25 to join the modules to form a required circuit. Similarly, an L-shaped relay welding portion 11b of the connector module 11 is overlapped and welded to a welding portion 14a of the relay module 12.

Thus, by modularizing in this way, each module itself can be treated as a component,
Mounting, in which electric components are directly attached to a circuit, is also possible. For example, in the relay module 12, the relay 20 is mounted on the bus bar 14 of the circuit board 13 molded with the insulating resin 15 and soldered.

FIGS. 2A and 2B show the relay module 1.
2 is a circuit board 13 for use, and a conductive bus bar 14 is covered with an insulative resin 15 by molding, and a large number of terminal holes 16 for relay connection are provided in accordance with the terminal positions of the relay 20. I have. From the side of the non-opposite side of these terminal holes 16, the gas vent recess 17 is
6 is provided so as to be communicated.

That is, the gas venting recess 17 is formed on the outer side 1 of the terminal hole 16 on the surface of the resin 15 serving as the mounting surface of the relay 20.
6a, the opening extends from the outer shape of the main body case 21 of the relay 20 (shown by a two-dot chain line in the figure; the same applies hereinafter) when the relay 20 is attached. It has been set to the length to be output. In addition, terminal hole 16
And the width of the depression is set to be substantially the same as the outer side 16a of the terminal hole 16 while making the communication side with the terminal deepest so that the depth gradually decreases toward the extension side that becomes the mounting surface. As a result, a sufficient opening area is secured.

The terminal hole 16 is used for soldering.
The resin hole 16b has a large opening, and the busbar hole 16c has a small opening in accordance with the terminal 22 of the relay to be mounted. Further, the circuit board 13 is used for welding connection with the modularized main connector module 11, and has an L-shaped welded portion 1 continuous with the bus bar 14.
4a is projected from one side.

On the other hand, the relay 20 to be attached is
Although the connection terminals 22 project from the lower surface of the box-shaped main body case 21, the legs and spacers for forming a gap as in the related art are not provided.

The relay 20 is mounted on the circuit board 13 by inserting the terminal 22 of the relay 20 into the terminal hole 16 of the circuit board 13 as shown in FIGS.
Is in contact with the upper surface 13a of the circuit board 13. Next, the terminal 22 and the bus bar 13 are soldered. At this time, the gas G generated from the molten solder H is used.
Is a gas vent recess 1 through a terminal hole 16 as shown in FIG.
It is released outside through 7. At this time, since the bottom surface 17a of the gas venting recess 17 gradually rises, the generated gas G is also discharged smoothly along the bottom surface 17a.

In the above connection state, the relay 20
The lower surface 21a of the main body 21 is fixed in contact with the upper surface 13a of the circuit board 13 with a wide contact area.
The main body with mass is in a stable state without shaking.

The gas venting recess 17 is not limited to the above-described embodiment. For example, in the case of a circuit board 13 'having terminal holes 16-1' to 4 'as shown in FIG. The terminal holes 16-2 'located on the upper side have shorter outer upper and lower sides 16-2a' and 2b ', so that the width of the gas vent recess that can be formed is also limited. Therefore, in order to secure a sufficient opening area, the gas venting recesses 17-2 are formed up and down.
a 'and 2b' are provided so that the gas can be reliably discharged to the outside.

If the gas venting recess cannot be communicated from the outer side of the terminal hole due to the surrounding conditions or the like, as shown in FIG. 6, the terminal hole 16 "of the circuit board 13" is formed.
The gas venting recess 17 "may be formed so as to extend from the inner side 16d" of the first portion while communicating outward from the inner side 16d ". Note that, in the above-described embodiment, the relay module in the modularized junction box has been described.However, in the case of a connector module other than the relay module, the above-described mounting structure can be applied to mounting of the connector portion and the like. Also, the present invention can be applied to a type of board for soldering electronic components in a junction box that is not modularized.

[0033]

As is clear from the above description, when the electric component mounting structure of the present invention is used, the release of gas generated from the molten solder is ensured, and the electronic component has a large contact area with the circuit board. Since it is stably mounted and fixed, even if a severe vibration or the like occurs during the running of the automobile, the reliability of the circuit can be ensured regardless of the stress or the like at the soldered portion. In addition, since it is not necessary to form a degassing leg or the like in an electric component to be attached, the shape can be simplified and the cost of a mold and the like required for production can be reduced. Furthermore, by modularizing the internal circuit, it is possible to prevent the junction box from becoming large and to flexibly cope with circuit changes and the like.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a modularized junction box to which the mounting structure of the present invention is applied.

FIG. 2A is a perspective view of a circuit board, and FIG. 2B is a cross-sectional view taken along line AA in FIG.

FIGS. 3A and 3B are perspective views showing a state in which a relay is mounted on a circuit board.

FIG. 4 is a sectional view taken along line BB in FIG. 3 (B).

FIG. 5 is a plan view of a circuit board according to a modified example.

FIG. 6 is a plan view of a circuit board according to another modification.

FIG. 7 is an exploded perspective view of a conventional junction box.

FIG. 8 is a cross-sectional view showing a mounting structure of the relay on a circuit board.

FIG. 9 is a bottom view of the relay.

FIG. 10 is a cross-sectional view showing a mounting structure of another relay on a circuit board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Junction box 12 Relay module 13 Circuit board 14 Bus bar 15 Resin 16 Terminal hole 17 Gas release recess 20 Relay 22 terminal H Solder G Gas

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01R 4/02 H01R 4/02 C (72) Inventor Yuji Osaka 1-14 Nishisuehirocho, Yokkaichi-shi, Mie Prefecture Sumitomo Wiring Systems Co., Ltd. F-term (reference) 3J023 EA03 FA01 GA01 5E085 BB06 BB27 BB30 CC01 CC03 DD01 DD03 GG40 HH01 JJ06 JJ25 JJ38 5G361 BA03 BA07 BB01 BC01

Claims (3)

[Claims] An electric component is mounted on a circuit board on which a bus bar is resin-molded, and terminals of the electric component are inserted into terminal holes formed on the circuit board and connected to the bus bar by soldering. An electric component mounting surface of the circuit board is provided with a gas vent recess communicating with the terminal hole and opening outward from the outline of the electrical component, and a gas generated during soldering is released through the gas vent recess. Electrical component mounting structure. 2. The gas venting recess provided in communication with each of the terminal holes is formed on a non-opposite side of the terminal holes, and gradually becomes shallower from the terminal holes toward the mounting surface. Electrical component mounting structure according to the item. 3. A junction box provided with the electric component mounting structure according to claim 1, wherein the junction box has a connector connection circuit section and a fuse connection circuit section housed in an upper case and a lower case. The relay connection circuit section is divided and provided separately as a connector module, a fuse module, and a relay module. Each module is joined by overlapping and welding the fuse module and the relay module welding part to the module welding part. In the relay module, the electric component consisting of the relay is mounted on the bus bar molded in the resin. A jaw characterized by being mounted and soldered Junction box.