JP3085446B2 - Electrical junction box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric junction box which selectively builds up a high-grade circuit wiring board on a base circuit wiring board as required.

[0002]

2. Description of the Related Art Wiring of automobiles is simplified by using an electrical junction box in which relays and fuses are integrated. FIG. 6 is an exploded perspective view of the electric junction box, and FIG. 7 is a longitudinal sectional view showing a conventional example of a high-grade electric junction box A, in which a first-layer wiring board 1, a second-layer wiring board 2,
The third-layer wiring board 3 and the fourth-layer wiring board 4 are stacked, placed on the under cover 5, and housed inside the main cover 6.

[0003] The first layer wiring board 1 is a base circuit wiring board shared by the electrical junction boxes of each grade, and protrudes upward at both ends of a bus bar 1 a provided on the first layer wiring board 1. tab-shaped terminal 1c projecting tab-shaped terminal 1b and the lower
Is provided, and the terminal 1 b projects to a connector mounting portion 7 provided on the main cover 6 and is electrically connected to a connector (not shown) inserted into the connector mounting portion 7. Terminal 1
c penetrates through the second-layer wiring board 2, the third-layer wiring board 3, and the fourth-layer wiring board 4, protrudes into the connector mounting portion 8 provided on the undercover 5, and is inserted into the connector mounting portion 8. It is electrically connected to a connector (not shown).

The second-layer wiring board 2 is a high-grade circuit wiring board. Tab-shaped terminals 2b and 2c projecting upward and downward are provided at both ends of a bus bar 2a provided on the second-layer wiring board 2. Is provided, and the terminal 2b is inserted into the connector mounting portion 7 through the first-layer wiring board 1 (shown in the figure).
Electrically connected to the no), the terminal 2c is a third layer wiring board 3 and the fourth layer circuit board 4 through, for electrical connection to a connector to be inserted into the connector mounting portion 8 (not shown).

[0005] Similarly to the first and second layer wiring boards 1 and 2, the third layer wiring board 3 has terminals 3b at both ends of a bus bar 3a.
The terminal 3b penetrates the first-layer wiring board 1 and the second-layer wiring board 2 and protrudes into the connector mounting portion 7, and the terminal 3c penetrates the fourth-layer wiring board 4 to provide a connector. It protrudes into the mounting portion 8. Similarly, the fourth-layer wiring board 4 is provided with tab-shaped terminals 4b and 4c at both ends of the bus bar 4a, and the terminals 4b are connected to the first-layer wiring board 1, the second-layer wiring board 2, and the third-layer wiring board. 3, the terminal 4c protrudes into the connector mounting portion 8, and the terminal 4c protrudes into the connector mounting portion 8.

When the electrical junction box is of a grade that does not require a high-grade circuit of the second-layer wiring board 2, as shown in FIG. 8, the first-layer wiring board 1, the third-layer wiring board 3, and the third-layer wiring board 3 A four-layer wiring board 4 is laminated to form an under cover 5 and a main cover 6.
However, the total thickness of the first-layer wiring board 1, the third-layer wiring board 3, and the fourth-layer wiring board 4 is reduced by the thickness of the second-layer wiring board 2, so that the connector The terminals 1b of the first-layer wiring board 1 projecting to the mounting portion 7 have an appropriate amount of protrusion, whereas the terminals 3b of the third-layer wiring board 3 and the terminals 4b of the fourth-layer wiring board 4 have large amounts of protrusion. Problem occurs.

In addition , the terminal 3c of the third-layer wiring board 3 and the terminal 4c of the fourth-layer wiring board 4 projecting from the connector mounting portion 8 have an appropriate amount of protrusion, whereas the first layer wiring board 1 has Terminal 1
The problem that the protrusion amount of c becomes large occurs. Since the total thickness of the first-layer wiring board 1, the third-layer wiring board 3, and the fourth-layer wiring board 4 is reduced, the mutual positions of the undercover 5 and the main cover 6 are close to each other, and the locking portions ( problems such as can not be engaged not shown) occurs.

FIG. 9 is a perspective view of a main part showing how to attach a bus bar D to an insulating plate C of a wiring board B. The bus bar D is stamped from a metal plate by pressing and a tab-shaped terminal E is bent. After the transfer, the leg F provided on the bus bar D is inserted into the mounting hole G provided on the insulating plate C, and the tip of the leg E is bent to form a bus bar. D is fixed to the insulating plate C. This place
When the bus bar D is transferred onto the insulating plate C and the bus bar D is to be sucked on the suction surface H of the suction mechanism provided in the transfer device, a sufficient suction space is obtained because the width of the bus bar D is small. However, there is another problem that it is difficult to transfer the busbar D.

Using the high-grade circuit wiring board as described above,
To prevent tab terminals from being uneven when not in use
First, in the electrical junction box as described above,
Busbar penetrations and tabs on the wiring board sandwiched from both lower sides
A notch is provided around the root of the start-up, and the notch is
The projecting portion to be inserted is provided continuously with the wiring board that holds the wiring board,
An electrode in which the height of the projection is set substantially equal to the thickness of the wiring board
A gas junction box was proposed (Japanese Utility Model Laid-Open No. 4-137429).

However, the bus bar penetrating portion of the wiring board and the
Make a notch around the root
Connect the protrusion inserted into the notch to the wiring board that sandwiches the wiring board.
In such a case, the structure of the insulating plate becomes complicated,
There was a point to be improved, such as inviting an upgrade.

[0011]

SUMMARY OF THE INVENTION The object of the present invention is to
In order to eliminate the drawbacks of conventional products such as this, without removing the second-layer wiring board with high-grade circuits without complicating the structure of the insulating board, a structure in which the total thickness of the entire wiring board does not change It has, and is to provide an electrical junction box having a circuit board that can transfer a bus bar to ensure insulation board in the manufacturing stage.

[0012]

To achieve the above object, according to the Invention The electrical junction box of the present invention, the connector attaching portion for accommodating the connector to the main cover and the under cover constituting a main body of the electrical junction box It is provided on the connector mounting portion on the inside of the main cover and the under cover
A bus bar wiring board having a tab-shaped terminal connected to the housed connector is housed therein, and the bus bar wiring board has a base.
Laminated on the circuit board and, if necessary, the base circuit board
It is composed of a high-grade circuit wiring board that is housed as
In the electrical connection box it is, put into the base circuit wiring board
Protruding from the contact surface between the high-grade circuit wiring board that
Cormorants, the interval holding piece having a substantially equal projection length in the stacking thickness of the high-grade circuit wiring board of the base circuit wiring board
Provided upright from the bus bar, in the above high-grade circuit wiring board is characterized in the provision of the insertion hole through which the spacing holding piece is inserted.

[0013]

The electric junction box constructed as described above has a high-grade circuit wiring board when the high-grade circuit wiring board and the base circuit wiring board are stacked and accommodated between the main cover and the under cover. The tip of the spacing plate protruding from the base circuit wiring board that contacts one surface of the high-grade circuit wiring board is inserted into the insertion hole of the high-grade circuit wiring board and contacts the contact surface that contacts the other surface of the high-grade circuit wiring board. ing.
Therefore, even if the high-grade circuit wiring board is removed, the laminated thickness of the wiring board does not change, so that the length of each terminal protruding into the connector mounting portion is maintained at an appropriate length, and the main cover and the under cover are locked. Also engage normally.

The spacing member is provided on the bus bar.
Since that, when bending processing the tab-shaped terminal of the bus bar,
At the same time, it can be bent and formed , the processing is extremely easy, the structure of the wiring board is not complicated, the number of components does not increase, and the manufacturing cost does not increase.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing an essential part of an electric junction box of the present invention, and FIG. 2 is a longitudinal section of a high-grade electric junction box. FIG. 3 is a longitudinal sectional view of a low-grade electric connection box from which a high-grade circuit wiring board is removed, and FIG. 4 is a perspective view of a bus bar of a base circuit wiring board used in the electric connection box of the present invention. . Electrical connection box High-grade A _1, as shown in FIG. 2, the high-grade circuit wiring board 20 of the first layer, the under cover 5 base circuit wiring board 21, 22 of the second and third layers are laminated And is housed inside the main cover 6.

The first-layer high-grade circuit wiring board 20 includes:
A bus bar 24 is attached to the upper surface of the insulating plate 23, and a terminal 25 extending upward from the bus bar 24 and a terminal 2 extending downward.
6 is provided, and the terminal 25 extending upward projects into the connector mounting portion 7 of the main cover 6 and is electrically connected to a connector (not shown) inserted into the connector mounting portion 7. The terminal 26 extending downward projects into the connector mounting portion 8 of the under cover 6 and is electrically connected to a connector (not shown) inserted into the connector mounting portion 8.

Since the base circuit wiring board 21 of the second layer comes into contact with the high-grade circuit wiring board 20 of the first layer, the bus bar 28 attached to the upper surface of the insulating plate 27 extends upward, and The terminal 2 which projects through the terminal insertion hole 33 of the high-grade circuit wiring board 20 and protrudes into the connector mounting portion 7
9, in addition to the terminal 30 extending downward and projecting to the connector mounting portion 8, a plurality of spacing pieces 31 projecting toward the first-grade high-grade circuit wiring board 20 are provided (FIGS. 2 and 4).
reference).

The spacing member 31 has a protruding length substantially equal to the lamination thickness of the high-grade circuit wiring board (as in this embodiment, the high-grade circuit wiring board is the first layer wiring board 20).
In the case of only the first-layer wiring board 20, the projection length is substantially equal to the thickness dimension of the first-layer wiring board 20). On the other hand, the first-grade high-grade circuit wiring board 20 is provided with an insertion hole 32 through which each of the spacing members 31 is inserted (see FIG. 1). Touch

[0019] Each space holding piece 31, punched out bus bar 28 by a press, during the bending process, since the processing with the terminal 29, 30, never production costs is increased. Ma
In addition , the spacing member 31 can be formed of an unnecessary bus bar portion of the conventional bus bar. When the spacing member 31 is provided in the vicinity of the terminal 29, if the width of the terminal insertion hole 33 of the first-grade high-grade circuit wiring board 20 is increased and the spacing member 31 is inserted, the insertion hole 32 becomes It becomes unnecessary.

The bus bar 28 is provided with legs 34 for fixing to the insulating plate 27, similarly to the conventional bus bar. The bus bar 37 attached to the insulating plate 36 is also provided on the third-layer base circuit wiring board 22 (see FIG. 1), but the third-layer base circuit board 22 is the first-layer high-grade circuit wiring board 20. Does not come into contact with the
Is not provided.

[0021] High-grade from the electric connection box A ₁ of the configured high-grade as above the first layer circuit wiring board 20
Is removed to make a low-grade electrical junction box, is the tip of the spacing member 31 in contact with the main cover 6 ?
Therefore , the distance between the base circuit wiring board 21 of the second layer and the main cover 6 does not change (see FIG. 3). Accordingly, the terminal 29 is also held at an appropriate protruding length, and there is no change in the lock position of the main cover 6 and the under cover 5, and both are normally locked.

Since the second-layer base circuit wiring board 21 is provided with a plurality of spacing pieces 31, the second-layer base circuit wiring board 21 is not likely to be shaken. In addition, the bus bar 2
Since providing the interval holding piece 31 to 8, the shape of the insulating plate 27
It doesn't get complicated. Busbar 2 processed by press
To transfer the 8 to the insulating plate 27, if the clamp apart holding piece 31 by the clamp mechanism 37 provided on the conveying device, being gripped busbar 28 is surely no risk of falling in the transfer (Fig. 5 reference).

[0023]

According to the electric junction box of the present invention , the following effects can be obtained. (1) to the base circuit wiring board in contact with the high-grade circuit wiring board, because provided a substantially equal distance holding pieces in the stacking thickness of the high-grade circuit wiring board, the electrical connection of the low-grade to remove the high-grade circuit wiring board Even in the case of a box, the distance between the under cover and the main cover does not change, and the protruding length of each terminal is maintained at an appropriate length. For the same reason, the lock position at which the under cover and the main cover are engaged does not change.

(2) Forming interval maintaining pieces on busbars
Since it is, the under cover, main cover, there is no need to provide a complicated projections on an insulating plate of each wiring board, since the distance holding pieces are simultaneously formed during processing molding of the busbar,
The manufacturing cost of the electrical junction box does not increase. (3) Since the spacing member can be gripped by the clamp mechanism provided in the transfer device for transferring the bus bar, transfer by the transfer device is facilitated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of an electric junction box of the present invention.

FIG. 2 is a longitudinal sectional view of a high-grade electric junction box of the present invention.

FIG. 3 is a longitudinal sectional view of a low-grade electric junction box of the present invention.

FIG. 4 is a perspective view of a bus bar used in the electric junction box.

FIG. 5 is a perspective view illustrating a bus bar gripping method according to the present invention.

FIG. 6 is an exploded perspective view of the electric junction box.

FIG. 7 is a longitudinal sectional view of a conventional high-grade electric junction box.

FIG. 8 is a longitudinal sectional view of a conventional low-grade electric junction box.

FIG. 9 is a perspective view of a conventional bus bar used for an electric junction box.

[Explanation of symbols]

A ₁ Electrical connection box 5 Under cover 6 Main cover 7, 8 Connector mounting section 20 First-grade high-grade circuit wiring board 21, 22 Second-layer and third-layer base circuit wiring boards. 23, 27, 35 Insulating plate 24, 28, 36 Bus bar 25, 26 Terminal 29, 30 Terminal 31 Spacer 32 Insertion hole 33 Terminal insertion hole 37 Clamp mechanism

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-359614 (JP, A) JP-A-4-137429 (JP, U) JP-A-61-129413 (JP, U) JP-A-6-129413 17327 (JP, U) Japanese Utility Model 7-30528 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02G 3/08-3/20

Claims (1)

(57) [Claims] [Claim 1] A main cover and the under cover constituting the electrical junction box body is provided with co <br/> connector mounting portion for accommodating the connector, the inside of the main cover and the under cover Busbar wiring board having tab-shaped terminals connected to connectors housed in the connector mounting portion
Is accommodated, and the bus bar wiring board is a base circuit wiring board.
And, if necessary, stacked and accommodated on the base circuit wiring board.
An electrical junction box comprising a high-grade circuit wiring board, which is substantially equal to the laminated thickness of the high-grade circuit wiring board so as to protrude from the contact surface of the base circuit wiring board with the high-grade circuit wiring board. A spacing holding piece having a protruding length is provided standing upright from the bus bar of the base circuit wiring board,
Electrical connection box, characterized in that a through hole which the spacing holding pieces is inserted in the high-grade circuit wiring board.