JP2002084632A - Electrical junction box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical junction box which can prevent erroneous insertion of a multi-pole type fuse. SOLUTION: The multi-pole type fuse 14 is inserted to a fuse inserting part 12. The multi-pole fuse 14 includes fuse elements 34a, 34b of different capacities. The basic end surface 14a of the multi-pole fuse 14 is provided with three junction terminals 32 in a line. Each junction terminal 132 is formed with asynmmetrical length in the right and left sides with reference to the fuse center line A2. Moreover, a tab part 22 is projected, corresponding to each connection terminal 32 at the bottom part 12a of the fuse inserting part 12. Each tab part 22 is connected to each junction terminal 32, under the condition that the multi- pole fuse 14 be inserted to the fuse inserting part 12.

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 into which a multi-pole type fuse is inserted.

[0002]

2. Description of the Related Art In recent years, miniaturization of automobiles has been progressing, and miniaturization of components mounted in automobiles has been required. For this reason, a multi-pole fuse having a fuse function for a plurality of fuses in addition to a general fuse may be inserted into an electrical junction box mounted on an automobile. is there.

[0003] For example, as shown in FIG.
1 is provided with a fuse insertion portion 52. Three tabs 53 project from the bottom 52 a of the fuse insertion part 52. A multipolar fuse 54 is inserted into the fuse insertion portion 52. The multi-pole type fuse 54 has two fuse elements (not shown). Capacities that allow electricity to flow through each fuse element are different from each other. Further, three connection terminals 55 are arranged in a row on a base end face 54 a of the multipolar fuse 54. Each connection terminal 55 is formed to have the same length. Each connection terminal 55 is arranged so as to correspond to the tab 53. These connection terminals 55 are connected to the respective tab portions 53 in a state where the multipolar type fuse 54 is inserted into the fuse insertion portion 52.

[0004]

The multi-pole type fuse 54 is formed symmetrically with respect to the fuse center line A1. For this reason, the multipolar fuse 54 can be inserted into the fuse insertion portion 52 regardless of the orientation of the multipolar fuse 54. However, since the current-carrying capacities of the respective fuse elements are different from each other, if the multi-pole type fuse 54 is erroneously inserted into the fuse insertion portion 52, the fuse element with the smaller capacity may be blown. At the same time, too much electricity may flow through the other fuse element, and the circuit connected to that fuse element may be damaged.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric junction box that can prevent erroneous insertion of a multipolar fuse.

[0006]

In order to solve the above-mentioned problems, according to the present invention, there are provided fuse elements having different capacities, and three or more connection terminals are arranged in a line on the same plane. A multi-pole type fuse, and a fuse insertion portion having a tab portion arranged to correspond to each of the connection terminals and projecting from a bottom portion, wherein the multi-pole type fuse is inserted into the fuse insertion portion. In the electric connection box in which each of the connection terminals is connected to each of the tab portions, each of the connection terminals is formed to have an asymmetric length with respect to a fuse center line along a direction in which the connection terminals extend. Make a summary.

According to a second aspect of the present invention, in the first aspect of the present invention, the multipole type fuse is completely inserted into the fuse insertion portion by contacting the connection terminal in the fuse insertion portion. The gist of the invention is that erroneous insertion preventing means for preventing insertion into the device is provided.

According to a third aspect of the present invention, in the second aspect of the present invention, the erroneous insertion preventing means is provided at a position on the inner wall surface of the fuse insertion portion on a base end side of the tab portion. The gist of the invention is that the longest end of the connection terminal is an erroneous insertion prevention rib that abuts.

The "action" of the present invention will be described below. According to the first aspect of the invention, each connection terminal is formed to have a length that is asymmetrical with respect to the fuse center line along the direction in which the connection terminal extends. Therefore, if the fuse insertion part is formed so as to correspond to each connection terminal,
At the time of incorrect insertion, it becomes impossible to completely insert the longest connection terminal into the fuse insertion portion. Therefore, it is impossible to completely insert the multi-pole type fuse into the fuse insertion portion at the time of erroneous insertion. Therefore, erroneous insertion of the multipolar fuse can be prevented.

According to the second aspect of the present invention, when the multipolar fuse is erroneously inserted, the erroneous insertion preventing means prevents the multipole fuse from being completely inserted into the fuse insertion portion. Therefore, it can be determined whether or not the multi-pole type fuse is erroneously inserted into the fuse insertion portion.
Therefore, erroneous insertion of the multipolar fuse can be more reliably prevented.

According to the third aspect of the invention, when the multipolar fuse is erroneously inserted, the tip of the longest connection terminal abuts on the erroneous insertion prevention rib, so that the multipole type fuse is removed from the fuse insertion portion. The fuse protrudes. Therefore, it can be determined whether or not the multipolar fuse has been erroneously attached to the fuse insertion portion. Therefore, erroneous insertion of the multipolar fuse can be more reliably prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an electric junction box for a vehicle embodying the present invention will be described below in detail with reference to FIGS.

As shown in FIGS. 1 and 3, the electrical component insertion block 11 constituting the electrical junction box is a substantially rectangular parallelepiped housing. The electrical component insertion block 11 is configured by fitting a lower case 13 as a first case and an upper case 15 as a second case. An insulating board 20 is accommodated in the electrical component insertion block 11. A bus bar 21 is laid on the insulating substrate 20.

A plurality of fuse insertion portions 12 are formed on the component insertion surface 15a of the upper case 15. A multipolar fuse 14 is inserted into each fuse insertion portion 12. As shown in FIG. 3, two partition walls 16 protrude from the bottom 12a of the fuse insertion portion. Also, from the bottom 12a of the fuse insertion portion 12, 3
The tab portion 22 of the book is protruded. Each tab portion 22 is formed by bending a part of the bus bar 21. These tab portions 22 are respectively provided in the space formed by the inner wall surface of the fuse insertion portion 12 and each partition wall 16. The pitch between the tab portions 22 is uniform. Tab part 2 arranged on the rightmost side in FIG.
2 is approximately half the height of the other tab portions 22. As shown in FIG. 4, a notch 41 is provided at the tip of each tab 22.
Are provided so as to extend along the longitudinal direction of the tab portion 22. At the opening end of the notch 41, a pair of holding pieces 4
1a are provided so as to face each other.

Further, as shown in FIG. 3, an erroneous insertion preventing rib 23 as erroneous insertion preventing means is arranged in the fuse insertion part 12. The rib 23 for preventing erroneous insertion is formed integrally with the inner wall portion 12 b and the partition wall 16 of the fuse insertion portion 12. The erroneous insertion prevention rib 23 is provided at a position on the base end side of the tab portion 22 disposed on the leftmost side in FIG. Contact surface 23 of erroneous insertion prevention rib 23
The height of “a” is set to be about one third of the height of the tab portion 22 provided with the erroneous insertion prevention rib 23.

As shown in FIG.
4 includes a main body 31 and three connection terminals 32.
The main body 31 is formed in a substantially rectangular parallelepiped shape by a transparent or translucent synthetic resin. Grooves 33 are provided on opposite side surfaces of the main body 31. In the main body 31, two fuse elements 34a and 34b are provided. Each fuse element 34a, 34b connects each connection terminal 32 to each other. The capacities that allow electricity to flow through the fuse elements 34a and 34b are different from each other. In the present embodiment, the maximum capacity of electricity that can flow through the fuse element 34a is set to 7.5A. The maximum capacity of electricity that can flow to the fuse element 34b is 10A.
Is set to Each fuse element 34a, 34
b is connected to separate circuits via the connection terminals 32, respectively.

Further, as shown in FIGS. 2 and 3, each connection terminal 32 is electrically connected to the tab portion 22 by being directly held between the holding pieces 41a. Each connection terminal 32 is arranged in a row with its tip protruding from the base end surface 14 a of the multipolar fuse 14. Each connection terminal 32 is arranged so as to correspond to the tab portion 22. Therefore, the pitch between the connection terminals 32 is uniform. Each connection terminal 32 is formed to have a different length. Specifically, the connection terminal 32 arranged on the fuse center line A2 is about twice as long as the shortest connection terminal 32. The longest connection terminal 32 is about three times as long as the shortest connection terminal 32. The length of the longest connection terminal 32 depends on the contact surface 23a of the erroneous insertion prevention rib 23 and the partition wall 1.
6 is set larger than the height up to the tip. Accordingly, each connection terminal 32 is formed to have a length that is asymmetrical with respect to the fuse center line A2 along the direction in which the connection terminal 32 extends.

Next, the operation of inserting the multi-pole type fuse 14 into the fuse insertion portion 12 will be described in detail. As shown in FIGS. 3 and 4, when the multipolar fuse 14 is inserted into the fuse insertion portion 12 in a state where the longest connection terminal 32 is located on the right side, the tip of each connection terminal 32 becomes a pair of holding pieces 41.
Inserted between a. In this case, the connection terminal 32 is clamped by the clamping pieces 41a by the urging force generated by deforming the clamping pieces 41a in a direction away from each other. Therefore, the connection terminal 32 is securely connected to the tab portion 22. As a result, the multi-pole type fuse 14 is completely inserted into the fuse insertion portion 12.
That is, the upper end surface of the multi-pole type fuse 14 is positioned below the open end of the fuse insertion portion 12.

As shown in FIG. 5, when the multi-pole type fuse 14 rotated 180 ° about the fuse center line A2 from the state of FIG. 2 is inserted into the fuse insertion portion 12, the longest connection terminal is obtained. The tip of 32 contacts the contact surface 23a. At the same time, the end of the shortest connection terminal 32 is arranged in a state separated from the end of the tab portion 22. As a result, the tip of the multi-pole type fuse 14 is
Projecting from the opening end of the opening. Therefore, it is determined that the multi-pole type fuse 14 is erroneously attached to the fuse insertion portion 12.

Therefore, according to the present embodiment, the following effects can be obtained. (1) Each connection terminal 32 is formed to have a length that is asymmetrical with respect to the fuse center line A2 along the direction in which the connection terminal 32 extends. Therefore, if the fuse insertion portion 12 is formed so as to correspond to each connection terminal 32, it becomes impossible to completely insert the longest connection terminal 32 into the fuse insertion portion 12 at the time of erroneous insertion. Therefore, at the time of erroneous insertion, the multi-pole type fuse 14 is
It becomes impossible to insert completely into 2. Therefore, erroneous insertion of the multipolar fuse 14 can be prevented.

(2) When the multi-pole type fuse 14 is erroneously inserted, the multi-pole type fuse 14 is prevented from being completely inserted into the fuse insertion portion 12 by the erroneous insertion prevention rib 23. Therefore, it can be determined whether or not the multi-pole type fuse 14 is erroneously inserted into the fuse insertion portion 12. Therefore, erroneous insertion of the multipolar fuse 14 can be more reliably prevented.

(3) When the multi-pole type fuse 14 is erroneously inserted, the tip of the longest connection terminal 32 abuts against the erroneous insertion prevention rib 23, so that the multi-pole type fuse 14 is removed from the fuse insertion portion 12. Protrude. Therefore, it can be determined whether or not the multi-pole type fuse 14 is erroneously attached to the fuse insertion portion 12. Therefore, erroneous insertion of the multipolar fuse 14 can be more reliably prevented.

(4) Only the rightmost tab portion 22 in FIG. 3 is about half as high as the other tab portions 22. Therefore, at the time of erroneous insertion, the shortest connection terminal 32 is prevented from being electrically connected to the tab portion 22. Therefore, it is possible to prevent the fuse element 34a from being blown due to excessive current flowing through the fuse element 34a.

(5) The connection terminal 32 and the shortest connection terminal 32 arranged on the fuse center line A2 can be formed only by cutting off the tip of the connection terminal 32, for example. Therefore, the cost for forming the multi-pole type fuse 14 can be reduced. Also, body 3
Since the change of 1 is unnecessary, the versatility of the multipolar fuse 14 can be improved.

The embodiment of the present invention may be modified as follows. -In the said embodiment, the length of each connection terminal 32 was different, respectively. However, if the multipolar fuse 14 is formed asymmetrically with respect to the fuse center line A2, some of the connection terminals 32 may be formed to have the same length.

Four or more connection terminals 32 may be arranged in rows from the base end surface 14a of the multipolar fuse 14, and each connection terminal 32 may be formed to have a length that is asymmetrical with respect to the fuse center line A2.

In the above embodiment, the connection terminal 32 is directly connected to the tab portion 22. However, the connection terminal 32 may be indirectly connected to the tab portion 22 via a relay terminal. In addition, the connection terminal 32 and the tab portion 22
The connection terminal 32 may be connected to the tab portion 22 by providing a through hole in one of them and locking the other in the through hole.

In the above embodiment, the erroneous insertion preventing rib 2
3 is a tab portion 22 on the inner wall surface of the fuse insertion portion 12.
Was provided at a position on the base end side. However, the erroneous insertion prevention rib 23 may be provided at a position where the tip of the shortest connection terminal 32 abuts when the multipolar fuse 14 is completely inserted into the fuse insertion portion 12.

In the above embodiment, the upper case 15
Although the side is described as upward and the lower case 13 side as downward, when assembling the electric junction box to the vehicle, for example, the upper case 15 may be located below and the lower case 13 may be located above. Further, the vehicle may be assembled to the vehicle such that the side walls of the upper case 15 and the lower case 13 face upward, that is, the electric connection box is rotated by 90 °. That is, the electric connection box is
5, 13 may be assembled so as to face any direction.

Next, in addition to the technical ideas described in the claims, technical ideas grasped by the above-described embodiment will be enumerated below. (1) The electrical connection box according to any one of claims 1 to 3, wherein the lengths of the connection terminals located at both ends of the row are different from each other.

(2) A multipolar fuse having fuse elements with different capacities and having three or more connection terminals arranged in a row on the same plane, and a tab portion arranged to correspond to each of the connection terminals And a fuse insertion portion protruding from the bottom, and in a connection structure of an electric connection box in which each of the connection terminals is connected to each of the tab portions in a state where the multipolar fuse is inserted into the fuse insertion portion. The connection structure of an electric connection box, wherein each of the connection terminals is formed to have an asymmetric length with respect to a fuse center line along a direction in which the connection terminals extend.

(3) In a multi-pole type fuse having fuse elements having different capacities and three or more connection terminals arranged in a row on the same plane, each of the connection terminals is
A multi-pole type fuse having a length which is asymmetrical with respect to a fuse center line along a direction in which the connection terminal extends.

[0033]

As described in detail above, according to the first aspect of the present invention, erroneous insertion of a multipole type fuse can be prevented.

According to the second and third aspects of the present invention, the erroneous insertion of the multipolar fuse can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an electrical component insertion block to which a multipolar fuse is attached.

FIG. 2 is a cross-sectional view of a multipolar fuse.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4A is a sectional view taken along line AA of FIG. 3;
3B is a cross-sectional view taken along the line BB of FIG. 3, and FIG.
FIG. 4 is a sectional view taken along line CC of FIG. 3.

FIG. 5 is a cross-sectional view showing the electric connection box in a state where the multi-pole type fuse is incorrectly inserted.

FIG. 6 is a cross-sectional view showing an electric connection box in a state where a multi-pole type fuse is inserted in a conventional technique.

[Explanation of symbols]

12: Fuse insertion part, 12a: Bottom part, 14: Multipolar fuse, 14a: Base end face as a plane, 22: Tab part,
23: erroneous insertion prevention rib as erroneous insertion prevention means, 32
... Connection terminals, 34a and 34b ... Fuse elements, A
2: The fuse center line.

Claims (3)

[Claims] 1. A multipolar fuse having fuse elements having different capacities and having three or more connection terminals arranged in a row on a same plane, and a tab portion arranged corresponding to each of the connection terminals. A fuse insertion portion projecting from a bottom portion, wherein the multi-pole type fuse is inserted into the fuse insertion portion, and the connection terminals are connected to the respective tab portions. An electrical connection box, wherein the terminals are formed to have a length that is asymmetrical with respect to a fuse center line along a direction in which the connection terminals extend. 2. An erroneous insertion prevention means is provided in said fuse insertion portion for preventing said multipole type fuse from being completely inserted into said fuse insertion portion by being in contact with said connection terminal. The electrical junction box according to claim 1, wherein: 3. The erroneous insertion prevention means is provided at a position on the inner wall surface of the fuse insertion portion on the base end side of the tab portion, and the erroneous insertion prevention rib is in contact with the tip of the longest connection terminal. The electrical junction box according to claim 2, wherein