JP3094143B2 - Electrical connection box with fuse - 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 with a fuse, and more particularly to a fuse for use in conducting or interrupting a high voltage circuit or a large current circuit constituting a wiring harness of a transportation device such as an electric vehicle. It relates to an attached electric connection box.

[0002]

2. Description of the Related Art Conventionally, for example, in a switchboard of a high-voltage circuit, when a cover of a switchboard is opened, a male connector fixed to the cover is removed from a female connector fixed to a main body of the switchboard, and a high connector is removed. The configuration is such that conduction of the voltage circuit is interrupted and an operator does not accidentally touch the electrodes and receive an electric shock. On the other hand, since an electric vehicle is also provided with a high-voltage portion for driving a motor, it is necessary to take care so as not to cause an electric shock to an operator when maintaining the electric vehicle. In particular, automobiles need to be repaired not only by specialists in maintenance but also by ordinary people, so that electric shock must be thoroughly prevented.

For this reason, in a conventional electric vehicle, for example, an electric connection box provided with a safety plug for interrupting conduction of a high-voltage circuit is provided. It is configured to operate a safety plug in the electrical junction box to ensure safety. FIGS. 10 and 11 show such a conventional electrical junction box with a safety plug provided with a safety plug.

As shown in FIGS. 1 and 2, an electric connection box 101 with a fuse has a rectangular parallelepiped insulating case 102, a terminal 112 to which a wire 113 is connected at the rear, a safety plug 110, and a cylindrical shape. Connection pieces 111A, 11 at both ends
1B, the connection pieces 111A and 111B are provided with a fuse 111 having a bolt hole and a terminal 117 to which an electric wire 118 is connected at the rear. Further, the upper portion of the case 102 is opened, and a seal member 10 is provided on the outer periphery of the upper end.
4 are wound. The upper portion of the case 102 is covered with a cover 103, and when the cover 103 is covered, the inner surface of the cover 103 is sealed in contact with a seal member 104 to provide a waterproof structure.

Further, the safety plug 110 has a long structure and
A plurality of multi-springs are disposed in the axial direction, and comprise a conductive connection pin that can move up and down, and two female terminals that are vertically arranged to fit the connection pin,
When the connecting pin is in the position pulled down, 2
At least one of the two multi-springs when the two multi-springs are in contact with the two female terminals and the two female terminals are electrically connected to each other and the connection pin is in a position where it is pulled upward. Are not in contact with the female terminals, and the electrical conduction between the female terminals is cut off.

In the case 102, terminals 112
And one of the two female terminals of the safety plug 110 are screwed to the case 102 by bolts 114. As a result, while one of the two female terminals of the terminal 112 and the safety plug 110 is electrically connected,
It is fixed to the case 102. The electric wire 113 connected to the rear part of the terminal 112 is led out of the case 102 via a sealing member such as a grommet.

Further, another one of the two female terminals of the safety plug 110 and the connection piece 111 of the fuse 111 are connected.
B is screwed to the case 102 by a bolt 115. As a result, the other one of the two female terminals of the safety plug 110 and the fuse 111 are electrically connected and fixed to the case 102.

Further, another connecting piece 111A of the fuse 111 and the terminal 117 are connected to the case 1 by the bolt 116.
02. As a result, the terminal 117 and the fuse 111 are electrically connected, and
It is fixed to. Electric wire 1 connected to the rear of terminal 117
Reference numeral 18 denotes a case 102 via a sealing member such as a grommet.
It is derived outside.

The safety plug 110 in the case 102 of the electric junction box 101 with a fuse constructed as described above.
When the operation of lifting up the terminals is performed, both terminals 112, 117
The connection between the terminals 112 and 117 is closed by the operation of disconnecting the safety plug 110 and pulling the safety plug 110 downward.

[0010]

By the way, in the conventional electric connection box with a fuse having the above-mentioned structure, both the connecting pieces 111A and 111B of the fuse 111 are screwed by bolts or the like. Therefore, in order to electrically connect with another member, it was necessary to screw it with a bolt or the like. Furthermore, it is complicated and large in size,
In addition, an expensive safety plug 110 is required for opening and closing the circuit, and furthermore, the connection between the safety plug 110 and the connection piece 111B of the fuse 111 and the connection between the safety plug 110 and the
The connection with No. 2 had to be screwed with a bolt or the like. For this reason, the number of parts is increased, and it is difficult to reduce the cost, and it is also difficult to reduce the size.

Further, the entire cover 103 is provided for waterproofing.
Each time the safety plug 110 is operated, the cover 103 is removed and the case 10 is stored.
2 had to be released, which required a lot of work.
In addition, as shown, wires 113 to wires 118
In addition, there is a problem that the size of the case 102 in the lateral direction becomes large because the components are arranged in a line.

The present invention has been made to solve such problems and disadvantages, and its purpose is to reduce the number of parts.
An object of the present invention is to provide an electric junction box with a fuse that can be reduced in size, can be manufactured at a low cost, and that can be easily inspected and maintained.

[0013]

In order to achieve the above object, an electric junction box with a fuse according to the present invention is hollow and long, and has first and second openings at both ends in the longitudinal direction. A box body, a first connection piece having a mounting hole, and a second connection piece electrically connected by contact at both ends, and a fuse fixed in the box body by the first connection piece. A first terminal connected to the first connection piece of the fuse, a housing that can be fitted into the second opening, and is movable in the second opening; A sealing member fitted between an outer wall and an inner wall of the second opening; and a second terminal fixed to the housing and having an elastic and conductive contact portion at a distal end thereof, The housing moves backward in the second opening. That said contact portion is fitted and connected to the second connection piece of the fuse, the housing and the second
The contact portion is separated from the second connection piece of the fuse when the opening is moved in the exit direction.

Alternatively, the housing includes a locking arm having a locking projection, and the second opening includes a temporary locking lock hole and a final locking lock hole capable of locking the locking projection,
The contact portion is located at a position where the contact portion is fitted and connected to the second connection piece of the fuse, the locking projection is engaged with the final locking lock hole, and the contact portion is separated from the second connection piece of the fuse. It is characterized in that the locking projection is configured to engage with the temporary locking lock hole at the detached position. Alternatively, the first and second electric wires respectively connected to the first terminal and the second terminal are arranged in parallel at a distance, and the fuse is interposed between the two electric wires. It is characterized by.

[0015]

In the electrical junction box with a fuse according to the present invention, the housing is moved in the depth direction in the left end opening,
The contact portion of the second terminal and the tab-shaped second connection piece of the fuse are fitted to each other, and are thus electrically connected. Conversely, by moving the housing in the outlet direction at the second opening, the contact portion of the second terminal is separated from the tab-like second connection piece of the fuse, thereby breaking the electrical connection. . In this way, the number of components is reduced, and a miniaturized electrical junction box with a fuse is realized.

Further, the contact portion is located at a position where the contact portion is fitted and connected to the second connection piece of the fuse, and the locking projection is engaged with the final locking lock hole, so that the electrical connection state is stably maintained. .
Further, since the contact portion is located at a position separated from the second connection piece of the fuse and the locking projection engages with the temporary locking lock hole, the electrically opened state is stably maintained. Further, by arranging the electric wires in parallel at a distance from each other and connecting the fuses at substantially right angles between the electric wires, the lateral dimension of the electric junction box can be reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an electric junction box with a fuse according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a sectional view showing a configuration of an electric junction box with a fuse according to an embodiment of the present invention, and FIG. 2 is a partially cutaway top view of FIG. Electrical connection box 1 with fuse according to an embodiment of the present invention
Are a box body 2, a cover 5 fitted to the box body 2, a fuse 10 fixed inside the box body 2, and a first terminal 15 connected to a first connection piece 13 of the fuse 10. The housing 21 is movably fitted to the box body 2, and the terminal 30 is fixed in the housing 21 and connected to the second connection piece 11 of the fuse 10.

The box body 2 has a hollow cylindrical shape and has first and second openings 3 and 4 at left and right end portions in the longitudinal direction, respectively, and an upper frame portion 6 standing on the side surface at right angles to the longitudinal direction. It has an open portion that is enclosed, and further has a temporary locking lock hole 8 and a final locking lock hole 9 on the wall surface forming the second opening 4. The fuse 10 includes a tab-shaped second connection piece 11 and a first connection piece 13 having a bolt hole at both ends. The fuse 10 is held by a holding frame 7 provided inside the box body 2. Are fixed to the box body 2 by bolts 16. On the other hand, the tab-shaped second connection piece 11 does not have a bolt hole and is not screwed.

The first terminal 15 has a tip connected to the first connection piece 13 of the fuse 10 by a bolt 16 and is fixed to the box body 2 together with the fuse 10. The first electric wire 17 connected to the rear end of the first terminal 15 is
Is led out from the opening 3. A gap between the first opening 3 and the electric wire 17 is sealed by a rubber stopper 18, and a rear holder 19 is fitted outside the rubber stopper 18.

The housing 21 has a hollow cylindrical shape and has a locking arm 23 having a locking projection 24 on a side wall. Housing 2
1 is configured to be movable in the axial direction in the second opening 4. The locking projection 24 engages with the temporary locking lock hole 8 when the housing 21 is at the temporary locking position, and
1 is temporarily locked to the box main body 2, and when the housing 21 is at the full locking position,
1 is fully locked to the box body 2. Further, an O-ring 40 serving as a seal member fitted around the outer wall of the housing 21.
When the housing 21 is inserted into the second opening 4, the second
The sliding contact with the inner wall of the opening 4 eliminates intrusion of rainwater and dust.

The second terminal 30 has a spring-like contact portion 31 at the tip, and a second electric wire 33 connected to the rear end is led out from the second opening 4. The contact portion 31
When the housing 21 is fully locked to the box body 2, the fuse 10
The second terminal 30 and the fuse 10 are electrically connected with the second connection piece 11 interposed therebetween. A gap between the housing 21 and the second electric wire 33 is sealed by a rubber plug 32, and a rear holder 34 is fitted inside the housing 21 outside the rubber plug 33.

The cover 5 is fitted to the box body 2 so as to seal the upper frame 6 from the outside, and is fitted into the upper frame 6 so as to slightly protrude from the upper frame 6 when the cover 5 is fitted. The packing 41 is sealed in contact with the inner wall of the cover 5 to prevent rainwater and dust from entering the box body 2.

FIG. 3 is a perspective view showing an example of a fuse used in the electric junction box with a fuse according to the present invention. As shown in the figure, the fuse 10 has a cylindrical shape, and is configured such that first and second connection pieces 13 and 11 protrude from both ends in the axial direction. The characteristics of the fuse according to the present invention are as follows.
While the first connection piece 13 is a piece having the same screw configuration as a conventional fuse, the second connection piece 11 is not a screw configuration and has a tab shape, for example, a connector terminal. The electrical connection is made by sliding contact. Further, the contact portion 3 of the second terminal 30 is provided at the tip of the second connection piece 11.
A blade portion 12 is provided to facilitate the fitting of the blade 1. Further, a bolt hole 14 is provided in the first connection piece 13.

FIG. 4 is a perspective view showing another example of a fuse used in the electric junction box with a fuse according to the present invention.
As shown in the figure, the fuse 10A includes a connection piece 11A having a slip structure as a second connection piece. The fuse 10A is connected to the below-mentioned tubular contact portions 31B (see FIG. 7) and 31C (see FIG. 8).

FIG. 5 is a perspective view showing terminals used in the electric junction box with a fuse according to the present invention. As shown in the figure, the terminal 30 is formed from a plate-like material by integral molding, and the contact portion 31 is composed of two opposing elastic pieces. FIG. 6 is a perspective view showing another example of the terminal. The terminal 30A has a multi-spring 34 mounted inside a quadrangular contact portion 31A.

FIG. 7 is a perspective view of still another terminal, and the contact portion 31B is formed in a tubular shape. Contact part 3
1B is manufactured from a pipe or by cutting such as boring a round bar. FIG. 8 shows an example of the contact portion 31C formed in a cylindrical shape, which is manufactured by bending or the like. As described above, the contact portions 31B and 31C are used in combination with the fuse 10A provided with the connection piece 11A having a sliding structure (see FIG. 4). As a material for the terminal, a flat plate having conductivity, which can be obtained as a standard product, can be used, and the material is preferably a low-resistance material such as copper. Further, a light alloy or the like can be used, and furthermore, the surface may be plated to prevent rust or increase conductivity.

FIG. 9 is a sectional view showing the structure of another embodiment of the electric junction box with a fuse according to the present invention. As shown in the figure, box body 2A of electric connection box 1A with fuse
As shown in the figure, an opening 3A that opens upward from below the box body 2A is provided at the right end, and a housing 21A is provided at one left end so as to be movable up and down inside the box body 2A. . In the opening 3A at the right end, a terminal 15 to which an electric wire 17 is connected is arranged from top to bottom in the figure. On the other hand, in the housing 21A inserted at the left end,
The terminal 30D to which the electric wire 33 is connected is similarly arranged from top to bottom in the drawing. That is, the two electric wires 17, 33 penetrate the upper end surface of the box body 2A and are attached facing in the same direction.

As described above, the two electric wires 1 are provided in the box body 2A.
7, 33 are arranged in parallel at a distance. The fuse 10A is arranged at right angles to the electric wire 17 and the terminal 15, and the connection piece 13 and the terminal 15 at the right end in the figure of the fuse 10A are screwed to the box main body 2A at right angles by bolts 16.

As a result, the connection piece 11B at the left end of the fuse 10A is placed at a position perpendicular to the electric wire 33 and the terminal 30D. Therefore, when the housing 21A is moved downward from above, it moves in a direction perpendicular to the axial direction of the fuse 10A, and the terminal 30D is fitted from the side of the connection piece 11B of the fuse 10A. For this reason, the blade portion 12B of the connection piece 11B is provided on the side
D is easily fitted.

As described above, according to the configuration of this embodiment,
A fuse 10A is interposed between the two electric wires 17 and 33 arranged in parallel at a distance. That is, both electric wires 1
Fuse 10A is electrically connected at right angles to 7 and 33, respectively. As a result of this configuration, the circuit is formed in a U-shape in the box body 2A. Therefore, it is not necessary to arrange each part in a line, and it is possible to realize an electrical junction box with a fuse having a reduced lateral dimension. Such an electrical junction box having a reduced lateral dimension enables application to an automobile having a limited installation area or a flat installation area.

[0031]

As described above, the electric connection box with a fuse according to the present invention opens and closes the circuit only by the operation of sliding the housing inside the electric connection box. This eliminates the need for an operation such as removal, and has the effect of greatly simplifying circuit maintenance and inspection work. In addition, since the entire circumference of the O-ring for sealing between the housing and the electric junction box main body can be configured to be small, no force is required for sliding the housing, and the workability is greatly improved. In addition, the size of the O-ring is reduced, which is advantageous in cost.

Furthermore, as described above, the number of components such as bolts, including expensive components such as safety plugs, can be reduced, so that downsizing and cost reduction are possible. In addition, the configuration in which the components are arranged in a U-shape has the effect that the lateral dimension can be reduced.

As described above, the electrical junction box with a fuse according to the present invention has the remarkable effects that the number of components can be reduced and the size can be reduced, the cost can be reduced, and the maintenance and inspection work is facilitated. Can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of an electric junction box with a fuse according to the present invention.

FIG. 2 is a partially cutaway top view of the electrical junction box with a fuse of FIG. 1;

FIG. 3 is a perspective view showing a fuse used in the electric junction box with a fuse according to the present invention.

FIG. 4 is a perspective view showing another example of the fuse used in the electric junction box with a fuse according to the present invention.

FIG. 5 is a perspective view showing a terminal used in the electric junction box with a fuse according to the present invention.

FIG. 6 is a perspective view showing another example of the terminal used in the electric junction box with a fuse according to the present invention.

FIG. 7 is a perspective view showing another example of a terminal used in the electric junction box with a fuse according to the present invention.

FIG. 8 is a perspective view showing still another example of a terminal used in the electrical junction box with a fuse according to the present invention.

FIG. 9 is a cross-sectional view showing the configuration of another embodiment of the electric junction box with a fuse according to the present invention.

FIG. 10 is a top view showing a conventional electric junction box with a fuse.

11 is a sectional view of the electric junction box with a fuse of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric connection box with a fuse 2 Box main body 3, 4 Opening 5 Cover 6 Upper frame 7 Holding frame 8 Temporary lock hole 9 Lock lock hole 10 Fuse 11, 13 Connection piece 15, 30 Terminal 16 Bolt 17, 33 Electric wire 18, 32 Rubber stopper 19, 34 Rear holder 21 Housing 23 Locking arm 24 Locking projection 31 Contact portion 40 O-ring 41 Packing

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 4-98243 (JP, U) JP-A 3-76374 (JP, U) JP-A 3-97128 (JP, U) Utility model registration 3012277 ( JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02G 3/08 H02G 3/16

Claims (3)

(57) [Claims] 1. A box body that is hollow and long and has first and second openings at both ends in a longitudinal direction, a first connection piece having a mounting hole, and electrical conduction by contact. A fuse that is provided at both ends with a second connection piece to be made, and is fixed in the box body by the first connection piece; a first terminal connected to the first connection piece of the fuse; A housing capable of being fitted into the second opening and being movable in the second opening; a seal member fitted between an outer wall of the housing and an inner wall of the second opening; A second terminal fixed to the inside of the housing and having a resilient and conductive contact portion at a tip thereof, the contact portion being connected to the fuse when the housing moves in the rearward direction through the second opening. Fitting connection to the second connection piece of the Grayed the second electrical connection box with fuses, characterized in that a configuration in which separated from the connecting piece of the contact portion is the fuse to move the second opening in the exit direction. 2. The housing has a locking arm having a locking projection, and the second opening has a temporary locking lock hole and a full locking lock hole capable of locking the locking projection. When the contact portion is at a position where the contact portion is fitted and connected to the second connection piece of the fuse, the locking projection is engaged with the final locking lock hole, and the contact portion is detached from the second connection piece of the fuse. 2. The electric connection box with a fuse according to claim 1, wherein said locking projection is configured to engage with said temporary locking lock hole at a set position. 3. A first and a second electric wire connected to the first terminal and the second terminal, respectively, are arranged in parallel at a distance, and the fuse is interposed between the two electric wires. 3. The electrical junction box with a fuse according to claim 1, wherein the electrical junction box is configured.