JP2003249288A - Jointing structure of bus bar with printed board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To abolish a junction connector, suitably conduct alignment correction when a tab is directly connected to a printed board and prevent stress concentration on a joint. <P>SOLUTION: The jointing structure comprises an insulating plate 33 for partition arranged between bus bars 30, 32 and a printed board 34, tab correcting cylinders 33a, 33b, into which tabs 32a are inserted, screwing cylindrical bases 31a projecting from respective insulating plates 31, a temporarily engaging projection 31a-1 on a free end-side outer surface of each screwing cylindrical bases and a truly engaging projection 31a-2 on a base-side outer surface of the screwing cylindrical bases. The tabs 32a are into the respective tab correcting cylinders in a state that the insulating plate 33 for partition has been held by the temporarily engaging projections 31a-1, thereby conducting alignment correction, tabs 32a passed through the tab correcting cylinders are passed through respective tab holes 34a in a state that the insulating plate 33 for partition has been held by the truly engaging projections 31a-2, and soldered H, and the printed board 34 is screwed to the screwing cylindrical bases 31a. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a bus bar and a printed circuit board, and more specifically, a bus bar tab is penetrated through a tab hole of the printed circuit board and soldered to directly connect to a conductive material of the printed circuit board. In this method, the tabs of the bus bar are exactly aligned with the tab holes of the board before soldering.

[0002]

2. Description of the Related Art In a vehicle, a junction box is connected to electrical components mounted on various parts of the vehicle through a wire harness to centrally branch and connect a power circuit, a control circuit and a signal circuit. A laminated body of a bus bar and an insulating plate is housed inside the junction box, and a tab protruding from the bus bar is connected to a terminal of a wire harness terminal via a connector or the like.

In recent years, a large number of electronic control units (ECUs) made up of printed circuit boards have been used for controlling electrical components. The ECU is housed in the case of the junction box together with the laminated body to connect the bus bar and the ECU. There is a case.

For example, in a junction box 1 shown in FIG. 9, a printed circuit board (ECU) 4 having a large number of electronic components 4a mounted thereon is provided above a stacked body of a bus bar 2 and an insulating plate 3 in a case as an insulating plate 5 for partitioning. Are accommodated through. The bus bar 2 and the conductor of the printed circuit board 4 are electrically connected by using the relay connector 17 that houses the relay terminal 17a.

Alternatively, in the case of the junction box 6 shown in FIG. 10, a printed circuit board (E) is attached to an ECU case 7 provided separately from the case of the junction box 6.
CU) 9 is accommodated, and the connector 8 mounted on the printed circuit board 9 and the connector accommodating portion 16 on the side of the junction box 6 are fitted to each other as shown in FIG.
The electrical connection between the tab 10a of the bus bar 10 in 6 and the terminal in the connector 8 soldered to the conductor of the printed board 9 is achieved.

Further, in the case of the junction box 11 shown in FIG. 11, the terminals 14 are directly soldered to the printed circuit board (ECU) 15 housed inside the case 12, and the terminals 14 are provided on the case 12. It is press-fitted into the connector housing portion 12a.

[0007]

However, there are problems in the connection structure between the conductor and the bus bar of the conventional ECU shown in FIGS. 9 to 11. That is, in the case of the junction box 1 shown in FIG. 9, it is necessary to electrically connect the bus bar 2 and the printed circuit board 4 via the relay connector 3, which increases the cost by the amount of the relay connector 3. Further, in order to connect the connection end of the conductor of the printed circuit board 4 to the terminal 3a of the relay connector 3, it is necessary to concentrate the circuit arrangement on both sides of the printed circuit board 4, which limits the degree of freedom in circuit design. It was

Similarly, in the case of the junction box 6 and the ECU case 7 shown in FIG.
0 and the printed circuit board 9 use the connector 8 to electrically connect the printed circuit board 9 with the cost.
A circuit arrangement must be taken to concentrate the connecting ends of the conductors in the connector 8.

On the other hand, in the case of the junction box 11 shown in FIG. 11, the terminal tube 12 of the case 12 accommodating the terminal 14 is used although a connector for relay is not used.
b is brought into contact with the printed circuit board 15 to position (align) the terminal 14, and the terminal 14 and the printed circuit board 15 are aligned.
When the resin portion such as the case 12 is thermally expanded, the stress is directly concentrated on the solder connection portion, and the electrical connection reliability of the solder connection portion is deteriorated. ing. Further, the tip side of the terminal 14 soldered to the printed board 15 is immediately connected to the connector housing portion 12.
Since the circuit is formed only by protruding to a, the branch circuit as the junction box is printed circuit board 1
5 has to be built into the circuit, and there is a problem that the number of circuits of the printed board 15 increases.

The present invention has been made in view of the above problems. A first object of the present invention is to eliminate the relay connector when using a printed circuit board to reduce the cost and increase the degree of freedom in circuit design. In addition, when the terminals, tabs, etc. are directly connected to the printed circuit board, the second problem is to prevent stress from concentrating due to thermal expansion or the like while performing appropriate alignment correction.

[0011]

In order to solve the above-mentioned problems, the present invention inserts a tab projecting from a bus bar, which is housed in a case laminated on an insulating plate, into a tab hole of a printed circuit board. A structure for soldering connection with a conductive material of a printed circuit board, a partition insulating plate movably arranged between the bus bar and the printed circuit board, and a tab on the bus bar side provided on the partition insulating plate. A tab straightening cylinder, a screwed cylinder base for fixing the printed circuit board protruding toward the printed circuit board arrangement side from the insulating plate laminated on the bus bar, and the outer surface of the tip side of the screwed cylinder base. A temporary locking protrusion that is projected and holds the partition insulating plate at a temporary locking position, and a part that is more protruding than the temporary locking protrusion toward the base side of the screwed cylinder base, and that locks the partition insulating plate permanently. Equipped with a main locking protrusion to hold in position, The partition insulating plate is moved to the temporary locking position and the final locking position along the screwed cylinder base, and is attached to the tab straightening cylinder with the partition insulating plate held at the temporary locking position. The tab of the bus bar is inserted and alignment is corrected, and the tip of the tab passing through the tab straightening cylinder is held in a state where the partition insulating plate is held at the main locking position.
A bus bar configured to penetrate through a tab hole of a printed circuit board mounted at the tip of the screwed cylinder base, and in this state, the printed circuit board is screwed to the screwed cylinder base and the tab is soldered to the printed circuit board. And the connection structure of the printed circuit board.

In the above connection structure, the tab of the bus bar is inserted into the tab hole of the printed circuit board and directly solder-connected to the conductive material of the printed circuit board, so that the conventional relay connector is eliminated. Therefore, the cost can be reduced. In addition, since the printed circuit board is directly connected to the tab of the bus bar, there is no restriction that the connecting end of the conductive material on the printed circuit board is concentrated in one place as in the case of using the relay connector. The degree of freedom in circuit design can be increased.

Further, the tab of the bus bar does not use a connector because the partition insulating plate interposed between the bus bar and the printed circuit board is inserted into the tab straightening tube from the state of the temporary locking position and straightened. In addition, it is possible to surely and easily penetrate the tab holes of the printed circuit board for electrical connection. Moreover, by moving the insulating plate for partitioning to the base side of the screw fastening cylinder base and holding it at the main locking position, the space between the printed circuit board and the tab straightening cylinder screwed and fixed to the tip of the screw fastening cylinder base is held. Therefore, a distance can be provided between the tab straightening cylinder and the portion of the tab to be soldered to the printed circuit board. This allows
Even when the partition insulating plate or the like that constitutes the tab straightening tube is thermally expanded and misaligned, the tab can absorb the misalignment and prevent stress concentration on the soldered portion.

Further, since the tabs of the bus bar are connected to the printed board instead of connecting to the printed board by the terminals exposed in the connector accommodating portion of the case as in the conventional case, a branch circuit or the like is connected to the bus bar side. It can be formed and does not increase the number of circuits on the printed circuit board side.

The screwed cylinder base is projected from a corner of the case, and the entire surface of the bus bar, which is arranged over substantially the entire surface of the inside of the case, on the side where the printed board is arranged is the partition insulating plate. On the partition insulating plate, the tab straightening cylinder, in which tab holes for inserting the tabs of the bus bars protruding in a parallel state are provided in parallel, is projected at a required position on the partition insulating plate.

With the above construction, by providing the screwed cylinder base at the corner, the partition bar can be insulated over the entire surface between the bus bar and the printed circuit board. Also,
The tabs of the bus bar can be connected to the printed circuit board by protruding at any position without being provided in parallel, but by setting the tabs in parallel as described above, the corresponding tab straightening cylinder Need not be scattered.

The printed circuit board to which the tabs of the bus bar are soldered is covered with a cover, and the cover is lock-coupled to the case accommodating the bus bar, and at the same time, the lock claws are used for partitioning the main locking position. The insulating plate is moved to the final pushing position where it comes into contact with the bus bar.

With the above structure, the partition insulating plate can be moved to the final pushing position at the same time when the cover is locked to the case without pushing the partition insulating plate by hand, and the partition insulating plate comes into contact with the bus bar. The partition insulating plate itself is also stable. Further, since the gap between the soldered portion of the printed circuit board and the tab straightening cylinder can be further separated, the tab existing in the gap becomes free and serves to absorb stress, so that the stress concentration on the soldered portion is more effective. Can be prevented.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. 1 to 4 show a junction box 20 for an automobile. As shown in FIG. 1, connector housing portions 22, 23, 24, 26 and a diode housing portion 25 are provided on the lower surface of the case 21 of the junction box 20. As shown in FIG. 1 and FIG. 2, brackets 28 and 29 having oval or circular insertion holes 28a and 29a are horizontally projected to the side surface of the case 21 at opposing positions, and are used for an optional cassette. Eight lock parts 27 are provided.

Case 21 of junction box 20
As shown in FIG. 3 and FIG.
A laminated body formed by laminating 2 and the insulating plate 31 to form a circuit is arranged over substantially the entire surface of the case 21. Bus bar 3
Tabs 32a that are bent upward are projected in parallel with 0 and 32, and the insulating plate 31 has screwed cylinder bases 31a projected from four corners.

As shown in FIGS. 5 to 8, a temporary locking projection 31a-1 for temporarily locking the partition insulating plate 33, which will be described later, at the temporary locking position is provided on the outer surface of the screw fastening cylinder base 31a. The main locking projection 31a-2 for locking the partition insulating plate 33 at the main locking position is projected on the base side of the temporary locking projection 31a-1. In addition, a screw hole 31a-5 is formed in the upper surface 31a-4 of the screw fastening cylinder base 31a, and the case 2 among the four sides of the upper surface 31a-4 is formed.
The L-shaped frame portion 31a-3 is projected upward from the two sides facing the one side surface.

A printed circuit board 34 is placed on the upper surface 31a-4 of the screw fastening cylinder base 31a, and the four corners thereof are L-shaped frame portions 31.
a inside the a-3, and screw N into the screw hole 31a-5.
Fixed by. The printed circuit board 34 has tab holes 34a which are electrically connected to the conductive material on the circuit board and are formed at required positions, respectively.
By inserting the tabs 32a of the bus bars 30 and 32 into the tab holes 34a and soldering them, the bus bars 30, 3
I am trying to make a circuit connection with 2.

The bus bars 30, 32 and the insulating plate 3 are also provided.
The insulating plate 33 for partitioning is interposed between the laminate of No. 1 and the printed board 34 to partition the entire surface of the laminate. The partition insulating plate 33 has screwed cylinder bases 31 at its four corners.
As shown in FIG. 4, a through hole 33c is formed to penetrate a, and as shown in FIG.
a and a tab correction cylinder 33b having a short width are provided so as to project from the bus bar 30,
The tab 32a of 32 is penetrated.

The tab straightening holes 33a-1 and 33b-1 are provided in parallel in the tab straightening cylinders 33a and 33b.
A positioning protrusion 33a-2 of the printed circuit board 34 is projected on the upper surface where 3a-1 and 33b-1 are not present. Further, inside the tab correction holes 33a-1 and 33b-1, tapered portions 33a-3 and 33b-3 protruding in the proximity direction are provided.

Further, the cover 3 is provided on the exposed side of the printed circuit board 34 which becomes the case 21 opening of the junction box 20.
5 to cover the lock claw 35a of the cover 35 and the case 21.
The locked portion 21a is locked and locked.

Next, the assembly process of the junction box 20 will be described. As shown in the first step of FIG.
The through holes 3 of the partition insulating plate 33 in the state where the busbars 30 and 32 and the insulating plate 31 are stacked and arranged in the case 21.
3c is penetrated through the screw-mounting cylinder base 31a so that the temporary locking projection 31
While keeping it stopped at the upper end of a-1, bus bar 3
Attach the tips of the tabs 32a of 0 and 32 to the tab correction cylinders 33a and 3
3b is half-inserted into each tab correction hole 33a-1 and 33b-1. At this time, since the tab correction holes 33a-1 and 33b-1 are provided with the taper portions 33a-3 and 33b-1,
The tips of the tabs 32a of the bus bars 30 and 32 can be easily picked up and guided inside.

From this state, as shown in the second step of FIG. 6, the partition insulating plate 33 is pushed downward to get over the temporary locking protrusion 31a-1 to be in the temporary locking state, and the partitioning is performed. The insulating plate 33 is stopped at the upper end of the main locking protrusion 31a-2. In this state, the positioning hole of the printed board 34 is inserted into the positioning projection 33a-2 on the upper surface of the tab straightening cylinder 33a for positioning, and the printed board 34 is placed from above.

Further, as shown in the third step of FIG. 7, by pushing the partition insulating plate 33 downward, the main locking projection 3 is formed.
1a-2 is overridden and brought into a final locked state. In this state, the tab straightening holes 33a-33b of the tab straightening cylinders 33a, 33b-
The printed circuit board 3 is provided with the tab 32a that penetrates through the printed circuit board 1.
4 through the tab hole 34a, and screwed cylinder base 3
The corner portion of the printed board 34 placed in the L-shaped frame portion 31a-3 of the upper surface 31a-1 of 1a is screwed and fixed in the screw hole 31a-5. At this time, the tabs 32a of the bus bars 30 and 32
Since the alignment correction is performed by the tab correction cylinders 33a and 33b, it is possible to surely penetrate the tab hole 34a of the printed circuit board 34.

Then, the tab holes 34a of the printed circuit board 34 are formed.
The tab 32a penetrating into the
Connection between the circuit on the side of 32 and the circuit on the side of the printed circuit board 34 is attempted. At the time of this soldering work, since there is a gap between the lower surface of the printed board 34 and the tab straightening cylinders 33a and 33b, the tab straightening holes 33a-1 and 33b-.
It is possible to prevent the solder H from flowing into the inside 1.

Then, as shown in the final step of FIG. 8, the cover 35 is covered from above, and the lock claw 35 of the cover 35 is covered.
At the same time as a is locked and locked to the locked portion 21a of the case 21, the end 33d of the partition insulating plate 33 in the fully locked state is pushed by the lock claw 35a, so that the partition insulating plate 33 is removed. The uppermost bus bar 32 is automatically moved to the final pushing position where it abuts. In this final push-in state, the distance between the solder H connection portion of the printed board 34 and the upper ends of the tab straightening cylinders 33a and 33b is further increased.
Even when a resin member such as the partition insulating plate 33 is thermally expanded and misaligned, it can be absorbed by the free portion 32a-1 of the tab 32a, and the solder H soldering portion Stress concentration can be effectively suppressed.

According to the connection structure of the bus bar 32 of the junction box 20 and the printed board 34, the tabs 32a of the bus bars 30, 32 are inserted into the tab holes 34a of the printed board 34 and directly soldered to the conductive material of the printed board 34. Therefore, it is possible to eliminate the conventional relay connector and reduce the cost, and it is necessary to concentrate the connecting ends of the conductive material on the printed circuit board 34 in one place in accordance with the connector. Is also eliminated, and the degree of freedom in circuit design is increased.

Further, the tabs 32a of the bus bars 30, 32 are provided.
Is the tab straightening holes 33a-1 and 33b-1 of the tab straightening cylinders 33a and 33b from the state where the partition insulating plate 33 is in the temporary locking position.
Since the alignment is corrected by being inserted through the connector, it is possible to surely and easily penetrate the tab hole 34a of the printed circuit board 34 and electrically connect it to the conductive material on the circuit board without using a connector. Also, the tabs 32a of the bus bars 30 and 32
Is connected to the printed circuit board 34, a branch circuit or the like can be formed on the bus bar 30, 32 side, and the number of circuits on the printed circuit board 34 side is not increased.

In this embodiment, the partition insulating plate 33 is used.
The tab straightening cylinders 33a and 33b are internally provided with tab straightening holes 33a.
-1, 33b-1 are arranged in parallel, but a tab straightening cylinder for inserting one tab may be separately provided without being arranged in parallel. In that case, the protruding positions of the tabs 32a on the busbars 30, 32 side can also be scattered, and the busbars 30, 32
The degree of freedom of the circuit arrangement can be further increased.

[0034]

As is apparent from the above description, according to the present invention, the tab of the bus bar is inserted into the tab hole of the printed circuit board and is soldered to the conductive material of the printed circuit board. Cost reduction can be achieved by eliminating the connector, and there is no restriction that the connecting end of the conductive material on the printed circuit board is concentrated in one place along with the connector, and the degree of freedom in circuit design is increased. You can

Further, since the tab of the bus bar is inserted into the tab straightening tube of the insulating plate for partitioning and the alignment is straightened, the tab can be surely and easily penetrated into the tab hole of the printed circuit board without using the connector, and the tab can be electrically connected. Connection can be made. Moreover, the partition insulating plate is moved to the base side of the screw fastening cylinder base to be in the final locked state or the final push-in position, so that the soldered portion between the tab and the printed circuit board becomes the tip of the tab straightening cylinder. Even if the partition insulating plate forming the tab straightening tube is thermally expanded and misaligned, the tab is free to absorb the misalignment to prevent stress concentration on the soldered part. You can

[Brief description of drawings]

FIG. 1 is a top view of a junction box according to an embodiment of the present invention.

FIG. 2 is a side view of a junction box.

FIG. 3 is a sectional view of a junction box.

FIG. 4 is a bottom view before the cover of the junction box and the printed circuit board are attached.

FIG. 5 is a cross-sectional view showing a first step of assembling the junction box.

FIG. 6 is a sectional view showing a second step of assembling the junction box.

FIG. 7 is a sectional view showing a third step of assembling the junction box.

FIG. 8 is a sectional view showing a final step of assembling the junction box.

FIG. 9 is a sectional view of a main part of a conventional junction box.

FIG. 10 is a cross-sectional view of main parts of another conventional junction box and ECU case.

FIG. 11 is a partially cutaway side view of still another conventional junction box.

[Explanation of symbols]

20 junction box 21 cases 21a Locked part 22, 23, 24, 26 Connector housing 28, 29 bracket 31 Insulation plate 31a Screw stop cylinder base 31a-1 Temporary locking protrusion 31a-2 Main locking protrusion 30, 32 busbar 32a tab 33 Insulation plate for partition 33a, 33b tab straightening tube 33a-1, 33b-1 Tab straightening hole 33a-2 Positioning protrusion 33a-3, 33b-3 Tapered portion 33c through hole 34 Printed circuit board 35 cover H solder N screw

Claims (3)

[Claims] 1. A structure for inserting a tab projecting from a bus bar, which is housed in a laminated manner with an insulating plate inside a case, into a tab hole of a printed circuit board and soldering the conductive material of the printed circuit board. A partition insulating plate movably arranged between the bus bar and the printed circuit board, a tab straightening tube provided on the partition insulating plate and into which a tab on the bus bar side is inserted, and the bus bar are stacked and arranged. A screw-fixing cylinder base for fixing the printed-circuit board that projects from the insulating plate toward the printed-circuit board placement side, and a projecting projection on the outer surface of the tip end side of the screw-mounting cylinder base, and the partition insulating plate at the temporary locking position. A temporary locking projection for holding, and a main locking projection protruding toward the base side of the screw fastening cylinder base more than the temporary locking projection for holding the partition insulating plate in the main locking position, Insulate the insulating plate along the screw base The bus bar tabs are inserted into the tab straightening cylinders to correct the alignment while the partition insulating plate is moved to the locking position and the main locking position and the partition insulating plate is held at the temporary locking position. With the insulating plate held at the main locking position, the tip of the tab passing through the tab straightening tube is penetrated into the tab hole of the printed board mounted on the tip of the screw fastening tube stand. Is a connection structure between a bus bar and a printed circuit board, which is configured such that the tab is soldered to the printed circuit board while being screwed to the screwed cylinder base. 2. The screwed cylinder base projects from a corner of the case, and the entire surface of the bus bar, which is arranged over substantially the entire inside of the case, on the printed circuit board arrangement side is printed with the partition insulating plate. The tab straightening cylinder, which is partitioned from the substrate, and in which the tab insulating holes for inserting the tabs of the bus bars projecting in parallel are provided in parallel with each other on the partition insulating plate, are projected at required positions. The connection structure between the bus bar and the printed circuit board according to. 3. The printed circuit board to which the tabs of the bus bar are soldered is covered with a cover, and the cover is lock-coupled to the case accommodating the bus bar, and at the same time, the lock claws are provided at the main locking position. The connection structure between a bus bar and a printed circuit board according to claim 1 or 2, wherein the partition insulating plate is moved to a final pushing position where it abuts on the bus bar.