JP3146950B2 - 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 connection box for automobiles such as a junction box and a fuse box, and more particularly to a bus bar formed by punching a conductive metal plate into a required shape. The present invention relates to an electric junction box provided for the electronic device.

[0002]

2. Description of the Related Art Conventionally, some electric connection boxes such as junction boxes have a plurality of blade-type fuses 1 mounted thereon, as shown in FIG.

As shown in FIG. 5, the blade type fuse 1 has a pair of tab terminal portions 3a and 3b projecting in parallel from a main body 2 made of resin. In the body 2,
A fusing portion 4 for connecting the tab terminal portions 3a and 3b is provided. The fusing section 4 is blown by resistance heat when a current equal to or more than a predetermined value flows.

[0004] The blade type fuse 1 is mounted on a fuse mounting portion 7 a provided in an upper case 7. As shown in FIG. 6, the tab terminals 3a and 3b are connected to the upper case 7 and the lower case 8 of the junction box.
Is connected via an intermediate terminal 10 to a tab terminal portion 9a of a bus bar 9 stacked inside the bus bar.

[0005]

The conventional electric junction box equipped with the blade type fuse 1 has a structure in which two loads are connected to one blade type fuse 1 such as a horn and a hazard lamp. Was. In this structure, when an abnormal current flows in a circuit connecting one of the two loads to the power supply side and the fusing unit 4 is blown, supply of power to the other normally operating load is also cut off. I will.

On the other hand, in the case where one blade type fuse is connected to one load, a large number of relatively large fuse mounting portions 7a are provided in the upper case 7 or the lower case 8 of the electric junction box having a limited size. Since the electric connection box needs to be provided, the size of the electric connection box increases, and the cost increases.

The present invention has been made to solve the above-mentioned problems in the conventional electric junction box.
An object of the present invention is to enable one fuse to be connected to one load without increasing the size of the electric junction box.

[0008]

In order to achieve the above object, the present invention relates to an electric junction box having a bus bar for forming a circuit in a case, comprising a plurality of blow-off members made of strip-shaped conductive metal. A multi-fuse mounting portion for mounting a multi-fuse in which materials are juxtaposed on an insulating substrate is provided in the case, and a relay terminal for connecting the bus bar and the fusing member of the multi-fuse is provided in the multi-fuse mounting portion. At the same time, the relay terminal is provided with a contact portion that protrudes from the side wall portion and elastically bends at one end in the longitudinal direction, and a bus bar pressure contact portion that presses the tab terminal portion of the bus bar at the other end in the longitudinal direction. And a locking portion protruding elastically from the side wall portion is provided. The multi-fuse mounting portion has a through hole communicating between the inside and the outside of the case, and a periphery of the through hole. A plurality of first partition walls arranged side by side at intervals on the inner side of the cylindrical portion, and opposing the first partition walls. And a plurality of second partition walls arranged side by side at intervals so as to form a terminal storage chamber between the first partition walls and between the second partition walls. A contact portion of a relay terminal provided with a locking projection and arranged in a terminal accommodating chamber constituted by the first partition wall portion, and a contact portion of a relay terminal arranged in a terminal accommodating chamber constituted by the second partition wall portion. Are arranged in each terminal accommodating chamber so as to protrude into a gap between the first partition wall portion and the second partition wall portion and to lock the locking portion of the relay terminal with the locking projection. Then, the insulating substrate of the multi-fuse is inserted into the gap from the opening of the cylindrical portion, and the contact portion of the relay terminal disposed opposite to the multi-fuse is multi-connected. With elastically brought into contact with the fusing member Yuzu, providing electrical connection box, characterized in that it is configured to sandwich the insulating substrate elastically by the contact portion of the oppositely disposed relay terminal.

In the electric junction box, the case is provided with a multi-fuse mounting portion, and the multi-fuse mounted on the multi-fuse mounting portion is connected to the tab terminal portion of the bus bar via a relay terminal. In the case where one load is connected to each of the fusing members, the electric connection box does not increase in size.

[0010]

Further, as described above, the multi-fuse mounting portion is provided with a plurality of first and second partition walls facing each other inside the cylindrical portion, and the partition walls define a terminal accommodating chamber. Therefore, the size of the multi-fuse mounting portion is small. Therefore, even when a single load is connected to each of the blown portions of the multi-fuse, the size of the electric connection box does not increase.

When the board portion of the multi-fuse is inserted into the gap from the opening of the cylindrical portion, the contact portion of the relay terminal elastically contacts the fusing member, so that the multi-fuse and the bus bar are securely connected. .

Further, since the insulating substrate of the multi-fuse inserted into the gap is sandwiched by the contact portions of the relay terminals arranged opposite to each other, it is securely held in the multi-fuse mounting portion.

[0014] Further, since the locking portion provided on the relay terminal is locked by the locking projection provided in the terminal receiving chamber, the relay terminal is securely held in the terminal receiving chamber.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention shown in the drawings will be described in detail. 1 and 2 (A),
(B) An electrical junction box 11 according to the embodiment of the present invention.
Is connected to a busbar 17 via insulating plates 16a and 16b in a case 14 including an upper case 12 and a lower case 13.
a, 17b and 17c are stacked.

The bus bars 17a to 17c are provided with tab terminal portions 19 by bending required portions upward in the drawing. The insulating plates 16a and 16b have bus bars 17a to 17b.
In order to position 17c, a positioning projection 20 is provided at a required position, and a through-hole 21 for inserting a tab terminal portion 19 located below is provided.

The upper case 12 is provided with a multi-fuse mounting portion 24. The multi-fuse mounting portion 24 includes a rectangular through hole 25 penetrating the top plate 12 a of the upper case 12 in the thickness direction, and a through hole 25.
And a tubular portion 26 having openings at both ends so as to surround the periphery of the cylindrical portion.

The cylindrical portion 26 has long side walls 26a, 26b facing each other and short side walls 26c, 26d also facing each other, and has a rectangular cross section. The cylindrical portion 26 is a top plate 1 of the upper case 12.
The protrusion 2a protrudes from both the upper surface side and the lower surface side, and the protrusion amount on the upper surface side is set to be larger than the protrusion amount on the lower surface side.

Further, the side wall portion 2 on the long side of the cylindrical portion 26 is provided.
First partition walls 30a to 30d are provided at regular intervals in a comb shape inside one side wall 26a of 6a and 26b. Further, second partition walls 30e to 30h are provided in the other side wall 26b in a comb-like shape at regular intervals so as to face the first partition walls 30a to 30d provided inside the side wall 26a. ing. These partition walls 30a to 30h
It has a T-shaped cross-section and has side walls 26a, 26b.
Thin wall body 31 protruding from the inside of the
And a guide plate portion 32 provided at the distal end portion of the guide plate.

On the upper side of the cylindrical portion 26, one side wall 2
A gap 34 having a required width is formed between the distal ends of the partition walls 30a to 30d provided on the side wall 6a and the distal ends of the partition walls 30e to 30h provided on the other side wall 26b. on the other hand,
On the lower side of the cylindrical portion 26, the partition walls 30a to 30d are provided.
And a connecting portion 35 for connecting the leading end of the partition wall 30e to the leading end of the partition wall 30e to 30h.

The first partition wall portion 30a in the cylindrical portion 26
30d and the second partition walls 30e to 30h are divided into terminal receiving chambers 38a to 38e and 38f to 38j.
Is composed. In this embodiment, each side wall 26a,
The terminal accommodation chambers 38a to 38 are provided five each in the inside of 26b.
8j are formed, and a total of ten terminal accommodating chambers 38a to 38j are formed in the cylindrical portion 26.

Each of the terminal receiving chambers 38a to 38j is separated from the adjacent terminal receiving chambers 38a to 38j by the partition walls 30a to 30h as described above. In each of the terminal accommodating chambers 38a to 38j, the base ends of the partition walls 30a to 30h are partitioned by the side walls 26a and 26b, while the distal ends of the partition walls 38a to 38j have a required width. An opening 40 is formed.

The side wall portions 26a and 26b have openings 26 above the cylindrical portion 26 for each of the terminal accommodating chambers 38a to 38j.
e, a guide groove 42 extending to the lower opening 26f is provided. The relay terminal 4 is provided above the guide groove 42.
5 is provided with a locking projection 46. The locking projection 46 includes a first flat surface 46 a inclined at a required angle with respect to the bottom surface of the guide groove 42, a second flat surface 46 b parallel to the bottom surface of the guide groove 42, and a bottom surface of the guide groove 42. And a third plane 46c perpendicular to the third plane 46c.

The terminal receiving chambers 30a to 30h accommodate relay terminals 45 each having a structure as shown in FIG. The relay terminal 45 is formed by bending a conductive metal plate punched into a required shape, and has an elongated rectangular cylindrical shape as a whole.

The relay terminal 45 has one side wall 4
A contact portion 50 is provided on one end side in the longitudinal direction of 5a, and a locking portion 51 is provided on another side wall portion 45b opposed to the side wall portion 45a. The contact portion 50 cuts out the one side wall portion 45b to form an opening 50a, and makes the opening 50a project a connecting portion 50b having a base end connected to the side wall 45c, and a distal end of the connecting portion 50b. On the side, a contact piece 50c that is curved in a convex shape is provided.

On the other hand, the locking portion 51 is provided with a rectangular opening 51a in the side wall portion 45b, and the base end portion is provided with the opening 51a.
a on the upper side in the figure of the side wall portion 45a provided with a.
This is a structure in which a locking piece portion 51b is provided by bending a leading end portion extending downward in the drawing to an upper side in the drawing so as to be located inside the relay terminal 45 from the opening 51a. Further, at the other end of the relay terminal 45 in the longitudinal direction with respect to the contact portion 50, the opposing side wall portions 45a and 45b are folded inward to provide a bus bar press contact portion 53.

As shown in FIG. 1, the relay terminal 45 is oriented such that the contact portion 50 faces the opening 40 of the terminal accommodating chambers 38a to 38j and the locking portion 51 passes through the guide groove 42. It is inserted from the lower side of the terminal accommodating chambers 38a to 38j toward the upper side. As described above, when the relay terminal 45 is inserted into the terminal accommodating chambers 38a to 38j, first, the contact portion 50 passes through the connecting portion 35, and the first and second partition wall portions 30a to 30j through the opening 40. It protrudes into the gap 34 formed between 30d and 30e to 30h. On the other hand, the relay terminal 4
5 is inserted upward, the locking portion 51 of the relay terminal 45 gets over the locking protrusion 46 from below. At this time, as described above, the locking projection 46 has a relatively small force because the first flat surface 46a on the lower end side of the cylindrical portion 26 has a required angle of inclination with respect to the bottom of the guide groove 42. Thus, the locking portion 51 can be made to go over the locking projection 46. Further, since the third flat surface 46c on the upper end side of the tubular portion 26 is perpendicular to the bottom of the guide groove 42,
Even when an external force that urges the relay terminal 45 downward in the drawing acts, the locking portion 51 is held in a state locked by the locking protrusion 46, and the relay terminal 45 is moved from the terminal accommodating chambers 38 a to 38 j.
Will not fall off.

The tab terminals 19 of the bus bars 16a to 16c stacked inside the case 14 are provided at locations corresponding to the terminal accommodating chambers 38a to 38h of the multi-fuse mounting section 24. The tab terminal portions 19 of the bus bars 16a to 16c are pressed against the bus bar press contact portions 53 of the respective relay terminals 45 accommodated in the respective terminal accommodating chambers 38a to 38h.

On the other hand, a multi-fuse 55 is inserted into the cylindrical portion 26 of the multi-fuse mounting portion 24 from above in the figure. As shown in FIGS. 3A and 3B, the multi-fuse 55 is formed on a resin-insulated substrate 56 having a two-fold structure by a plurality of fusing members 57a to 57 made of strip-shaped conductive metal.
7d are juxtaposed. The insulating substrate 56 includes a hinge 5
6a and a pair of identical plate-shaped portions 56b, 5
6c, and a hinge portion 56a of each plate-shaped portion 56b, 56c.
An opening 58 is provided in the vicinity. The fusing members 57a-
57d extends from the end of one plate-shaped portion 56b to the end of the other plate-shaped portion 56c via the opening 58. The fusing members 57a to 57d are provided in parallel with each other.

The insulating substrate 56 is folded in two such that the pair of plate portions 56b and 56c are overlapped with each other with the hinge portion 56a as a fulcrum.
A portion located in the opening 58 of 7d constitutes a fusing portion 60 that is blown when an abnormal current flows. A cover 61 that covers the fusing portion 60 is fitted over the insulating substrate 56.

When the multi-fuse 55 is mounted on the multi-fuse mounting section 24, as shown by an arrow X in FIG.
30d and the lower end side of the insulating substrate 56 is inserted into the gap 34 formed between the distal ends of the partition walls 30e to 30h.
As described above, the gap 34 is provided with the facing relay terminal 4.
When the insulating substrate 56 of the multi-fuse 55 is inserted into the gap portion 34, the contact piece 50c of the contact portion 50 of each relay terminal 45 becomes
Each is elastically pushed into the opening 50a. Therefore, the contact piece 50 c is elastically pressed against the fusing members 57 a to 57 e on the insulating substrate 56, and
5 and the fusing members 57a to 57e of the multi-fuse 55 are electrically connected. In addition, as shown by an arrow Y in FIG. 2A, the contact piece 50c of the relay terminal 45 is pressed against the insulating substrate 56 of the multi-fuse 55 from both sides, and the insulating substrate 56 faces the insulating substrate 56. Relay terminal 45
Are elastically held between the contact portions 50. This contact part 5
The multi-fuse 55 is fixedly held in the cylindrical portion 26 by the elastic holding force of zero.

Although only one multi-fuse mounting section 24 is shown in FIGS. 1 and 2, a large number of multi-fuse mounting sections 24 are provided in the upper case 12 so that a large number of multi-fuse mounting sections 24 are provided. The fuse 55 can be mounted.

In the electrical junction box according to the present embodiment, the multi-fuse 55 can be mounted on the case 14 as described above, and the blowout portions 57a to 57
e is connected to the bus bars 16a to 16c via the relay terminal 45. Therefore, even in a circuit configuration in which one fusing member 57a to 57e is connected to one load,
The size of the electric connection box 11 does not increase, and the cost can be reduced.

If the load is connected to each of the fusing portions 57a to 57e of the multi-fuse 55 as described above, the wires connected to the other end of the circuit constituted by the bus bars 16a to 16c can be provided. The structure of the harness can be simplified, the productivity of the wire harness can be improved, and the cost can be reduced.

[0035]

As is apparent from the above description, in the electric junction box of the first aspect, the case is provided with a multi-fuse mounting portion, and the multi-fuse mounted on the multi-fuse mounting portion and the tab terminal portion of the bus bar are provided. Since the connection is made via the relay terminal, even when a single load is connected to each of the fusing members of the multi-fuse, the size of the electric connection box does not increase and the cost can be reduced. . Further, since a load can be connected to each of the fusing members one by one, the structure of the wire harness connected to the other end of the circuit constituted by the bus bar is simplified, productivity is improved, and costs are reduced.

In particular, when the multi-fuse mounting portion has a plurality of first and second partition walls facing each other inside the cylindrical portion, and the partition walls form the terminal accommodating chamber, Since the size of the multi-fuse mounting portion is small, even when a single load is connected to each of the blowout portions of the multi-fuse, the electric connection box does not become large.

When the insulating substrate of the multi-fuse is inserted into the gap from the opening of the cylindrical portion, the contact portion of the relay terminal elastically contacts the fusing member, so that the multi-fuse and the bus bar can be securely connected. Can be.

Further, since the insulating substrate of the multi-fuse inserted in the gap is sandwiched by the contact portions of the relay terminals arranged opposite to each other, the multi-fuse is securely held in the multi-fuse mounting portion.

Furthermore, since the locking portion provided on the relay terminal is locked by the locking projection provided in the terminal receiving chamber, the relay terminal is securely held in the terminal receiving chamber.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view showing an electric junction box according to an embodiment of the present invention.

FIG. 2A is a partial cross-sectional view showing an electric junction box according to the embodiment, and FIG. 2B is a partial plan view.

FIG. 3A is a perspective view showing a multi-fuse,
(B) is an exploded perspective view showing a multi fuse.

FIG. 4 is a partial perspective view showing an example of a conventional electric connection box.

FIG. 5 is a perspective view showing a blade type fuse mounted on a conventional electric junction box.

FIG. 6 is a partially exploded perspective view showing a connection structure between a blade type fuse and a bus bar of an electric connection box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Upper cover 13 Lower cover 14 Case 17a-17c Bus bar 24 Multifuse mounting part 30a-30h Partition wall part 38a-38j Terminal accommodating room 45 Relay terminal 46 Locking projection 50 Contact part 51 Locking part 55 Multifuse 56 Insulating board 57a ~ 57e Fusing member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-84420 (JP, A) JP-A-4-114718 (JP, U) JP-A-59-31175 (JP, U) JP-A-63 81616 (JP, U) Japanese Utility Model 1-79326 (JP, U) Japanese Utility Model 6-24323 (JP, U) Japanese Utility Model 4-131845 (JP, U) Japanese Utility Model 6-36187 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 85/12-85/54 H02G 3/16

Claims (1)

(57) [Claims] 1. A bus for configuring a circuit in a case.
An electrical junction box having a bar, wherein a plurality of fusing materials made of strip-shaped conductive metal are placed on an insulating substrate.
Multi-fuse for mounting juxtaposed multi-fuses
The fuse mounting part is provided in the case and the bus
Relay end for connecting the bar and the fuse of the above multi-fuse
Attached to the above multi-fuse mounting partAlong with The relay terminal protrudes from the side wall at one end in the longitudinal direction.
An elastically deformable contact portion is provided, while the other end in the longitudinal direction is
A busbar press-contact part for pressing the tab terminal of the busbar
And a resiliently bending locking portion protruding from the side wall portion is provided.
Become The multi-fuse mounting section connects the inside and outside of the case.
A through-hole passing therethrough and provided so as to surround the periphery of the through-hole
A cylindrical portion having both ends opened, and a gap is provided inside the cylindrical portion.
A plurality of first partition walls arranged side by side,
That are arranged side by side so as to face the partition
A second partition wall portion between the first partition wall portion and the second partition wall portion.
A terminal receiving chamber is formed between the partition walls of
Provide a stop projection, The first partition wall portion is arranged in a terminal accommodating chamber.
Terminal accommodating chamber formed by the contact portion of the relay terminal and the second cut wall portion
And the contact portion of the relay terminal disposed in the first partition wall portion
Projecting into the gap between the first terminal and the second partition wall, and
In each terminal accommodating chamber, the locking section is locked by the locking projection.
Arrange the relay terminals and mount the multi-fuse insulating substrate
Insert into the gap from the opening of the cylindrical part, and
The contact part of the arranged relay terminal is blown out of the multi-fuse.
Material is elastically in contact with
A configuration in which the insulating substrate is elastically held by the contact part of the relay terminal
And that An electrical junction box.