JP2003070128A - Relay box for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm fusion of a fusible link part from the outside while reducing the size of a relay box. SOLUTION: There are provided a block body and a lower case. A relay mounting part and a fuse mounting part protrude from the inside surface of a peripheral wall of the block body. The bottom wall of the lower case assembled to the lower part of the block has such shape as engaged with the gap between the relay mounting part and the fuse mounting part. A bus bar is fixed to the upper surface of the bottom wall, and the bus bar is provided along the gap between the relay mounting part and the fuse mounting part. A narrow fusible link part is provided in the middle of the bus bar. A tab inserted in the terminal holes of the relay mounting part and the fuse mounting part is formed by bending in the downstream of the bus bar. The block body is provided with a window for confirming fusion of the fusible link part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay box mounted on an automobile, and more particularly to a relay box in which a fusible link portion is formed on a bus bar arranged inside the relay box. It is to be seen from.

[0002]

2. Description of the Related Art Conventionally, a relay box connected to a battery mounted on an automobile has a structure shown in FIG. A mounting portion 4 and a connector mounting portion are provided, and fusible links, relays, fuses, and connectors are fitted into the respective mounting portions 2 to 4 by plug-ins and mounted. A fusible link, a relay, and a fuse are fitted and mounted on these mounting parts 2 to 4, respectively. The fusible link, the relay and the fuse are connected via an electric wire. In addition, the terminals on the output side of the relay and the fuse are connected by inserting and locking the terminals of the wire terminals into a terminal accommodating portion (not shown) provided on the bottom surface side of the case 1. Further, as shown in FIG. 8B, a bolting terminal 7 is connected to the end of the power supply line w1, and the bus bar 6 in the case is coupled with the bolt 8 for electrical connection.

[0003]

In the relay box having the above-mentioned structure, since the fusible link which is a separate component of the large-capacity fuse is inserted and connected, the number of assembling steps increases and the size of the relay box increases. is there. In addition, from the outside of the top and bottom of the relay box,
There is also a problem that it is not possible to easily confirm the melting of the fusible link.

The present invention has been made in view of the above problems, and has a structure for easily confirming the fusing of a fusible link from the outside, and a relay box for an automobile in which mounted components can be arranged in a high density in the block body. Offering is an issue.

[0005]

In order to solve the above-mentioned problems, the present invention comprises a block body and a lower case, the block body having a relay mounting portion and a fuse mounting portion projecting from an inner surface of a peripheral wall, and a lower portion of the block. The lower case to be assembled to has a bottom wall shaped to fit into the gap between the relay mounting portion and the fuse mounting portion, and a bus bar is fixed to the upper surface of the bottom wall so that the bus bar is fixed to the relay mounting portion and the fuse. A fusible link part having a narrow width is provided along the clearance of the mounting part, and a tab inserted into the terminal holes of the relay mounting part and the fuse mounting part is bent downstream of the bus bar. And a window for confirming that the block body and / or the fusible link portion are melted and cut. It provides a box.

More specifically, the block body is provided with a bottom wall along the gap between the relay mounting portion and the fuse mounting portion,
The bus bar is vertically closed by the bottom wall and the lower case. The window for confirming the fusing is provided at a position corresponding to the upper surface of the fusible link portion of the bottom wall of the block body and / or at a position corresponding to the lower surface of the fusible link portion of the bottom wall of the lower case. With this configuration,
The fusing of the fusible link can be confirmed from above and below, and the partition wall can ensure the waterproofness and dustproofness of the bus bar other than the fusible link. Further, by providing a protective wall for dustproofing and waterproofing around the window formed in the block body and / or the lower case, dustproofing and waterproofing of not only the bus bar but also the fusible link portion is enhanced. be able to.

The fusible link portion has a shape with a required narrow width and a required length that melts down when an overcurrent of 150 to 30 amperes flows.

According to the above construction, the busbar is laid flat and the fusible link portion is integrally formed on a part of the busbar. Therefore, a window is provided in the block body or / and the lower case at a position where the fusible link portion abuts. By providing it, when the fusible link melts,
The fusing of the fusible link can be easily confirmed from the outside without disassembling the block body and the lower case. Further, the fusing confirmation window can radiate heat generated from the fusible link portion.

Further, since the flatly placed bus bar is arranged by utilizing the gap between the relay mounting portion and the fuse mounting portion, it is not necessary to provide a special space for disposing the bus bar, and the space can be reduced. At the same time, it is possible to arrange the mounted components in high density while suppressing an increase in the size of the relay box. Further, in the present invention, since the fusible link portion is formed in the bus bar, it is not necessary to attach the fusible link in comparison with the case where the fusible link which is a separate component is attached, and the number of components and the number of attachment steps can be reduced. At the same time, the space for mounting the fusible link can be reduced.

A transparent resin is filled in the opening of the window to close it. The closing member made of the transparent resin may be molded in two colors with the block body, or may be fitted separately. As a result, the busbar and the fusible link can be reliably waterproofed and dustproofed.

Further, it is preferable to secure the heat dissipation from the upper surface of the fusible link portion by giving the above-mentioned closing material breathability and waterproofness. For example, by using a transparent sheet made of polytetrafluoroe resin as a porous material having a flexible fiber structure as the above-mentioned closing material, water can pass through but air can pass through, so that the window has heat dissipation while closing the window. be able to.

The bus bar fixed to the upper surface of the bottom wall of the lower case is composed of a single plate, and the fusible link portion is formed by bending a narrow portion into an S shape.

[0013]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In any of the embodiments, the present invention is applied to a relay box mounted on a vehicle and connected to a power source.

1 to 4 show a relay box 10 according to a first embodiment of the present invention, and as shown in FIG. 1, it has a block body 11, a lower case 12 and a bus bar 13.

The block body 11 has a rectangular peripheral wall 11a.
A relay mounting portion 15 and a fuse mounting portion 16 are provided so as to project from the inner surface of, and a bottom wall 11b is provided between the relay mounting portion 15 and the fuse mounting portion 16. Further, a cylindrical portion 18 into which the protective wall 14 protruding from the lower case 12 is inserted is provided along the inner surface of the peripheral wall 11a.

At the lower portion of the relay mounting portion 15, as shown in FIG. 3, a terminal hole 15 for inserting the tab of the bus bar 13 is inserted.
a and a terminal hole 15 for inserting and locking the female terminal of the end of the electric wire w3
b, and a tab 13d for relay connection is inserted into each of the terminal holes 15a. A relay 30 is mounted on the relay mounting portion 15, and an input side terminal 30a thereof is inserted into a terminal hole 15c to be connected to a tab 13d of a bus bar 13 described later, and an output side terminal 30b is connected to a female terminal T3 of an electric wire terminal. It is designed to be fitted and connected with. The fuse mounting portion 16 has a configuration similar to that of the relay mounting portion, and is configured such that a fuse is mounted and the input side terminal thereof is fitted and connected to the tab 13e of the bus bar and the output side terminal thereof to the terminal of the electric wire terminal.

The bottom wall 12a of the lower case 12 assembled to the lower portion of the block body 11 has a shape corresponding to the bottom wall 11b of the block body 11. As shown in FIGS. 1 and 3, the bottom wall 11b of the block body 11 at a position corresponding to the upper surface of a fusible link portion 13c described later has a window 20 for confirming the melting and the bottom wall 12a of the lower case 12 is opened. The corresponding window 21 is opened. The bus bar 13 fixed to the upper surface of the bottom wall 12a of the lower case 12 by caulking is made of a single plate obtained by stamping a conductive metal plate into a shape corresponding to the shape of the bottom wall 12a, and is arranged on substantially the entire surface of the bottom wall 12a. is doing. A protective wall 23 is provided around the window 20 so as to protrude from the bottom wall 11b. Similarly, a protection wall 23 'from the periphery of the window 21 is provided so as to project.

The bus bar 13 is formed by punching a conductive metal material and then bending it into a shape shown in FIGS. 1 and 2 (indicated by diagonal lines in the drawing). That is, the flat placing portion 13a fixed to the bottom wall 12a has a shape that conforms to the shape of the bottom wall 12a, and when the block mounting body 11 is assembled to the relay mounting portion 1a.
5, it is arranged along the bottom wall 11b which is a dead space between the fuse mounting portions 16.

The flat placing portion 13a forms a fusible link portion 13c having an S-shaped narrow width portion continuous with the wide width portion 13b arranged on the entire surface of the bottom wall 11b. These fusible link portions 13c are 150 amps to 30 amps.
It is a large-capacity fuse that blows when ampere current flows. Also, a tab 13d to be inserted into the terminal hole 15a of the relay mounting portion 15 is formed by bending upward at the downstream end of the bus bar 13, and a tab 13e for fuse connection is arranged in parallel on one side of the bus bar 13. It is formed by bending.

In the relay box having the above structure, the bus bar 13 is caulked and fixed on the bottom wall 12a of the lower case 12 and assembled to the lower portion of the block body 11, and the protective wall 21 is inserted into the cylindrical portion 18 to be positioned and held. Locked in the state.

Lower case 12 to the block body 11
With the assembly, the bus bar 13 is disposed along the dead space between the relay mounting portion 15 and the fuse mounting portion 16 provided in the block body 11, and the relay tab 13d is formed by being bent from the bus bar 13. Is inserted into the terminal accommodating portion of the relay mounting portion 15, and the fuse tab 13e is inserted into the terminal accommodating portion of the fuse mounting portion 16. Next, the relay mounting part 15 and the fuse mounting part 16 are mounted with relays and fuses, and an upper case (not shown) is covered after each connection work.

In the relay box 10 having the above structure, the fusible link portion 13c of the bus bar 13 is exposed vertically at the windows 20 and 21 for confirming fusing. Accordingly, when the upper case is removed, the fusing of the fusible link portion 13c can be easily confirmed from above and through the window 20 from above. Further, since it is opened in both the upper and lower directions, the heat generated from the fusible link portion 13c can be efficiently dissipated.

Further, the upper surface side of the flat placing portion 13a of the bus bar 13 is closed by the bottom wall 11b of the block body 11 and is not exposed to the outside, so that the bus bar 13 can be protected from dust and water. Moreover, the fusible link portion 13c is provided by the protective walls 23 and 23 'provided around the windows 20 and 21.
The waterproofness and dustproofness of can be secured.

Further, the bus bar 13 is connected to the relay mounting portion 1
5. Since the wires are routed along the gap between the fuse mounting portions 16, it is not necessary to provide a space for bus bar routing, and the relay box can be downsized.
In addition, since the fusible link portion 13c is formed on the bus bar, the fusible link mounting portion can be eliminated, and from that point also, the relay box can be downsized, the number of parts can be reduced, and the assembling workability can be improved. You can

FIG. 5 shows a relay box 10 according to the second embodiment of the present invention. Similar to the first embodiment, the block body 11 of the relay box 10 vertically closes the gap between the relay mounting portion 15 and the fuse mounting portion 16 by the bottom wall 11b, and hits the location of the fusible link portion 13c. Windows 20 and 21 for confirming fusing are formed at the positions. Instead of standing a protective wall around the window 20,
The block body 11 and the block body 11 are molded in two colors so that the opening portion of the window 20 can be filled with the transparent resin 24 and closed. Since the other points are the same as those of the first embodiment, the same reference numerals are given and the description thereof will be omitted.

In the relay box 10, the fusible link portion 13c has a window 21 of the lower case 12 on the lower surface side.
Thus, the fusing can be confirmed from the outside through the transparent resin 24 with which the window 20 is filled while being exposed to the outside.

FIG. 6 shows a relay box 10 according to the third embodiment of the present invention. This embodiment is similar to the second embodiment in that the window 20 formed on the bottom wall 11b of the block body 11 is closed, but the window 20 is made of a transparent resin by two-color molding with the block body 11. Instead of filling the same, a separate air circulation member 26 using a transparent resin sheet 25 is fitted into the window 20 and closed.

As shown in FIG. 6B, the air circulating member 26 has the transparent resin sheet 25 attached to the lower surface side of the upper lid portion 26a which is locked to the peripheral edge of the window 20, and the transparent resin sheet 25 is attached. The transparent resin sheet 25 is sandwiched between the lower lid portion 26b pressed from below and the upper lid portion 26a.

With this air circulation member 26, the block body 11
By closing the window 20 of 1., air passes but water does not pass, so that it is possible to provide heat dissipation while maintaining waterproofness. Further, since the air circulation member 26 is made of transparent resin, it is possible to confirm the fusing of the fusible link portion 13c from above by removing the upper cover.

FIG. 7 shows a main part of a relay box 10 according to the fourth embodiment of the present invention. The block body 11 of the relay box 10 includes a relay mounting portion 15 and a fuse mounting portion 1.
The gap 6 is vertically closed by the bottom wall 11b, and the bottom wall 11b of the block body 11 is not provided with a window for confirming the melting of the fusible link portion, and only the bottom wall 12a of the lower case 12 is used for confirming the melting. A window 21 is provided.

[0031]

As is apparent from the above description, in the automobile relay box of the present invention, the fusible link portion having a narrow width is integrally formed with a part of the flatly placed bus bar, and the fusible link portion is arranged. If a window for confirming fusing is provided on the block body that hits the position, if the fusible link part is blown, the fusible link part can be easily fused from above by removing the upper cover without disassembling the block body and the lower case. You can check.
In addition, the flatly placed bus bar is placed in the gap of the relay mounting part of the block body, so space can be reduced and the relay box can be prevented from becoming large even if the mounting parts are arranged in high density. You can Further, if a window for confirming fusing is provided on the lower case side, fusing of the fusible link can be confirmed from below.

Further, by filling the transparent window with transparent resin or by covering the transparent resin with a lid, the waterproofness and dustproofness can be enhanced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a relay box according to an embodiment of a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the bus bar is fixed to the lower case.

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

FIG. 4 is a view showing a connection portion between a relay and a bus bar.

FIG. 5 is a sectional view of a second embodiment.

FIG. 6 shows a third embodiment, (A) is a plan view, (B)
Is a sectional view.

FIG. 7 is a sectional view of a fourth embodiment.

FIG. 8 shows a conventional relay box, in which (A) is a plan view and (B) is a side view.

[Explanation of symbols]

10 relay box 11 block body 11b bottom wall 12 lower case 12a bottom wall 13 Bus bar 13a Flat placing part 13c fusible link part 13d relay connection tab 15 Relay mounting part 16 Fuse mounting part 20 21 Fusing confirmation window 23 Protective wall 26 Air circulation member

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01H 85/02 H01H 85/02 A 85/56 85/56 H01R 9/03 H01R 9/03 A 13/518 13/518 13/52 13/52 Z 13/70 13/70 F term (reference) 5E021 FB09 FB20 FC14 FC17 FC29 LA08 LA15 MA11 MA19 MA24 MB01 5E077 BB18 CC02 DD11 EE13 FF24 GG08 GG28 HH07 JJ16 JJ21 LL06E0787FF17 GG06 LL08 MM0804 QQ04 RR04 RR12 RR25 RR29 RR47 5G361 BA03 BB01 BB03 BC02 5G502 AA14 BA05 CC14 CC19 CC51

Claims (4)

[Claims] 1. A block main body and a lower case, wherein the block main body is provided with a relay mounting portion and a fuse mounting portion projecting from an inner surface of a peripheral wall, and a lower case assembled to a lower portion of the block has a bottom wall of the relay mounting portion and the fuse mounting portion. The busbar is fixed to the upper surface of the bottom wall, and the busbar is arranged along the clearance between the relay mounting section and the fuse mounting section, and is formed in the middle of the busbar. A fusible link portion having a narrow width is provided, and a tab to be inserted into the terminal hole of the relay mounting portion and the fuse mounting portion is bent and formed downstream of the bus bar, and the block main body and / or the lower case is fusible. A relay box for automobiles, which is provided with a window for confirming the melting of the bull link. 2. The relay box for an automobile according to claim 1, wherein a protective wall for dustproofing and waterproofing is provided upright around the window formed by opening in the block body and / or the lower case. 3. The opening portion of the window is filled with a transparent resin to close it, and the closing member made of the transparent resin is molded in two colors with the block main body or is fitted separately. The relay box for automobiles according to claim 1 or 2. 4. The relay box for an automobile according to claim 3, wherein the closure is provided with breathability and waterproofness.