JPH0254002B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] Industrial Application Field The present invention relates to a busbar circuit board constituting an electrical connection box such as a relay box or fuse box. Regarding the connection structure with the tab.

BACKGROUND TECHNOLOGY Connection methods for busbars and tabs can be roughly divided into two types: those in which the busbars are disposed parallel to the plane of the insulating substrate, and those in which the busbars are disposed vertically with the surface of the busbar perpendicular to the substrate.

In the former case, as shown in FIG. 8, a tab c is connected upright to the end of a bus bar b disposed parallel to an insulating substrate a, and a tab f of a blade fuse e is connected to this tab c via a female terminal d. (Refer to Japanese Unexamined Patent Publication No. 1983-46592). On the other hand, in the latter case, a relay terminal g is erected on an insulating substrate a as shown in FIG. f is inserted, and the contact pressure between the two is strengthened by the elastic tongue piece k coupled to the terminal board part j (Utility Model No. 57-130984
(see publication).

Problems to be Solved According to the prior art described above, in the case shown in FIG. 8, the busbars b are arranged parallel to the plane and the tabs c necessary for external tab connections are made to stand up, making the busbar routing complicated. In addition, the presence of the relay terminal d increases the bulk of the circuit board as a whole, making it difficult to downsize the circuit board and causing an increase in contact resistance.

On the other hand, in the case of Fig. 9 A and B, the circuit configuration is considerably simplified because the tab c is not required on the bus bar b, but the relay terminal g of a special structure is still used to connect the bus bar and the blade fuse. However, due to the presence of this relay terminal g, there was a problem in that the routing of the circuit was restricted.

The present invention was made to solve these problems, and its purpose is to directly connect the bus bar and the external facing tab without using a relay terminal, thereby preventing an increase in connection resistance due to contact. At the same time, it is an object of the present invention to provide a connection structure between a bus bar and a tab that is easy to downsize without being restricted by the routing of the bus bar.

[Structure of the invention]

Means for Solving the Problems The present invention provides a method in which a plurality of busbars are arranged and fixed vertically in the width direction at appropriate intervals on an insulating substrate, and are brought into contact with a desired busbar on the insulating substrate, facing each other. By providing a holding member, inserting a mating tab between the contact holding member and the opposing bus bar, and bringing the bus bar and the mating tab into elastic contact,
In order to achieve the above object, the contact holding member can be changed depending on the manner in which the bus bar is routed.

Function: By providing the contact holding member in advance in the box that accommodates and arranges the busbar, direct connection of external tabs is possible without any need for conventional relay terminals, and there is no need for the busbar itself. No machining (for example, tab c in Fig. 8) is required, and the routing of the bus bar is not affected.

Example Hereinafter, the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an exploded perspective view of an electrical connection box according to the present invention, FIG. 2 is an enlarged explanatory view of the main part thereof, and FIG. 3 is a cross-sectional view showing the state of connection between a bus bar and a tab.

The electrical connection box A is constructed by housing a plurality of busbars 2 in a box 1 made of plastic insulators and covering the cover 3 with a blade fuse 4 arranged from the front to the rear of the cover 3. an insertion hole 6 for a plurality of facing tabs 5;
A plurality of fitting frames 7 and relays 8 for connectors (not shown) are provided, and the case 1 and cover 3 are locked by locking claws 9 and locking holes 10 provided on the side walls.

In the case 1, side walls 11 at both ends in the longitudinal direction
A plurality of vertical grooves 12 are provided at predetermined intervals on the inner surface of the
The busbars 2 are fitted into the longitudinal grooves 12, and the plurality of busbars 2 groups are disposed so as to face each other parallel to each other. That is, the bus bar 2 groups are arranged in parallel to the insulating substrate 13 forming the bottom wall of the box 1 so as to be perpendicular to each other.

A contact holding member 14 for the bus bar and the tab is provided between the pair of bus bars 2, 2 facing each other, facing the tab insertion hole 6. In the example shown in FIG. 2, this contact holding member 14 is
A rectangular frame 16 with a hole 15 in the center is erected on top of the tab 3, and an elastic member 17 such as rubber is pasted on the surface facing the bus bar 2 to strengthen the contact pressure between the bus bar and the tab. It is desirable that the upper edge of the elastic member 17 is chamfered 18 so that the tab 5 can be easily inserted.

Thus, when the facing bipolar tab 5 of the blade fuse 4 is inserted through the tab insertion hole 6, the bipolar tab 5
is the elastic member 1 of the contact holding member 14 as shown in FIG.
7 and the bus bar 2 and is elastically pressed against the member 14, the bus bar 2 and the bipolar tab 5 are directly connected with appropriate contact pressure. At this time, if a protrusion 19 is provided between the bipolar tabs 5, 5 of the blade fuse 4 and a through hole 20 thereof is provided in advance in the cover 3, the protrusion 19 will fit into the center hole 15 of the contact holding member 14, causing vibrations. In addition to preventing this, contact can be stabilized. Note that the contact holding members 14' and 14'' provided at the other end of the bus bar 2 are for respective tabs (not shown) of the relay 8, and these contact holding members 14 to 14'' are provided between desired bus bars facing each other. Any electrical component having a (male) tab can be connected.

FIGS. 4 and 5 each show other embodiments of the contact holding member.

The contact holding member 21 shown in FIG.
is supported from below and held together with the tab. That is, the contact holding member 21 has a gripping (groove) portion 25 formed of a pair of receiving plates 23 and a U-shaped frame plate 24 at the upper end of the support column 22 erected on the insulating substrate 13. An elastic member 17 is attached to the inside of the plate 24 as in FIG. 2. This contact holding member 21 faces the wiring route of the bus bar 2,
A desired number of fuses are provided corresponding to the blade fuses 4 and the like. Note that the contact holding member 21 is
The frame body 16 shown in the figure may be extended upward, and the clamping portion 25 may be formed by cutting at the upper end thereof.

Since the contact holding member 21 has the above structure, it has the effect of fixing the bus bar 2 itself in addition to the effect of the above embodiment, and it is also possible to omit the vertical groove 11 of the box 1.

The contact holding member 27 shown in FIG. 5 is different from the linear bus bar shown in FIGS. 1 to 4 in that it simultaneously fixes a bus bar having a right-angled bent portion and connects it to a tab. be.

That is, four bus bars 2 having right-angled bent portions 26 are arranged in a cross-shaped manner, and an outer surface fixed wall (receiving plate) 29 having an L-shaped recess 28 that contacts the outer surface of the right-angled bent portion 26 and a bent It is securely clamped and fixed by the contact holding member 27 which is constituted by an inner fixing wall (frame plate) 30 having an L-shaped cross section and which comes into contact with the inner surface of the portion 26 .
Then, the inner fixed wall 30 can be fixed with the elastic member 17 as described above, or the bead 31 can be attached to the bus bar 2.
A more stable connection with the tab can be achieved by stamping and forming.

In this case, the opposing right angle bent portions 26a, 2
Needless to say, the bipolar tab 5 of the blade fuse 4 can be connected between the blade fuses 6b and 6b, but by inserting a multipolar blade fuse 4' having a four-pole tab 5' as shown in FIG. Simultaneous connection with four busbars 2 is possible as shown in FIG.

In the above embodiment, the bus bar and the contact holding member are provided on the insulating substrate, but the present invention is not limited to this, and they may be provided in the cover, for example.

〔Effect of the invention〕

The effects of the present invention are listed below.

(1) A contact holding member for the busbar and tab is provided on the insulating substrate on which the busbar is arranged, so the two can be directly connected, eliminating the need for conventional relay terminals and preventing an increase in contact resistance. Ru.

(2) The electrical parts connected to the busbar are not limited to blade fuses, but can be anything that has a (male) tab.

(3) Conventional relay terminals g (Fig. 9 A, B), etc. are no longer necessary, and the routing of the busbars that make up the circuit board is simplified, making it easier to downsize.

(4) The contact holding member between the busbar and the tab can be easily modified according to the shape of the busbar (for example, a right-angled bent part), and can also be used to fix the busbar, preventing its vibration and rocking. In some cases, the bus bar fixing means (the vertical groove 12) can be omitted.

(5) The contact holding member has a simple structure, and (3) and (4)
Combined with this effect, the cost of circuit boards can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an electrical connection box according to the present invention, Fig. 2 is an enlarged perspective view of the main parts thereof, Fig. 3 is a sectional view showing the connection state between the bus bar and the tab, and Figs. 4 and 5. 6 is a perspective view of the main part showing other embodiments of the present invention, FIG. 6 is a perspective view of a multipolar blade fuse used in the busbar connection of FIG. 5, FIG. 7 is a plan view of the connected state, and FIG. FIG. 8 and FIGS. 9A and 9B are explanatory diagrams showing the conventional bus bar and tab connection structure, respectively. A...Electrical connection box, 1...Box, 2...Bus bar, 4...Blade fuse, 5...Tab, 1
4, 21, 27... Contact holding member, 17... Elastic member, 23... Receiving plate, 24... Frame plate, 25... Holding part, 26... Right angle bending part, 29... Outer surface fixing wall, 30...Inner fixed wall.

Claims (1)

[Scope of Claims] 1. A plurality of bus bars are arranged and fixed vertically in the width direction on an insulating substrate at appropriate intervals, and a contact holding member is provided on the insulating substrate facing a desired bus bar, A busbar-to-tab connection structure in a busbar circuit board, characterized in that a mating tab is inserted between the contact holding member and the opposing bus bar to bring the bus bar and the mating tab into elastic contact. 2. The contact holding member is configured with a clamping part formed by a pair of opposing receiving plates and a frame plate, and a mating tab is inserted between the bus bar and the frame plate clamped by the clamping part, A connection structure between a busbar and a tab in a busbar circuit board according to claim 1, wherein the busbar and the mating tab are brought into elastic contact.