JP3442667B2 - 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 junction box such as a junction box having a busbar attached to a cover and a fuse attached to a fuse attachment block.

[0002]

2. Description of the Related Art As a conventional electric junction box such as a junction box, there is one shown in FIGS.
6 is an exploded perspective view of a main part of the electrical junction box, FIG. 7 is an enlarged perspective view of a fuse mounting block used in the junction box, and FIG.
FIG. 9 is an enlarged perspective view of a block terminal used for the fuse mounting block, and FIG. 9 is a partial perspective view near the fuse mounting portion of the junction box.

As shown in FIG. 6, an undercover (cover) 1 made of synthetic resin has a substantially rectangular recess whose one side surface 1a is formed to be lowered, and the recess is formed in the block accommodating chamber 2. Has become. That is, the block storage chamber 2 is surrounded by the stepped bottom surface 2a on which the bus bar 5 described later is installed and the side walls 3 and 3, and the upper side and the front side are open. Guide grooves 3a are formed on the inner surfaces of the side walls 3 and 3, respectively, and a fuse mounting block 6 made of a synthetic resin, which will be described later, is positioned and fitted by using the guide grooves 3a. ing. Further, lower partition walls 4 are juxtaposed at equal intervals on one side 1a side of the bottom surface 2a of the block accommodating chamber 2.

The bus bar 5 is formed by bending a flat plate made of a conductive metal having a predetermined shape so as to be aligned with the stepped bottom surface 2a of the block housing chamber 2, and along the stepped bottom surface 2a of the block housing chamber 2. It is supposed to be routed. A plurality of fuse connection terminal portions 5a having a pressure contact structure are juxtaposed on one end side of the bus bar 5, and the fuse connection terminal portions 5a are arranged so as to face the adjacent lower partition walls 4 and 4, respectively. There is.

As shown in FIGS. 6 and 7, the fuse mounting block 6 is inserted into or removed from the block accommodating chamber 2 (fitting / disengaging).
It has a free shape and guide protrusions 6a on both sides.
Are provided respectively. Further, a plurality of upper partition walls 7 are arranged in parallel at the lower portion of the fuse mounting block 6 at equal intervals, and as shown in FIG.
Each of the upper partition walls 7 when the
The lower surface of the lower partition wall abuts on the upper surface of each lower partition wall 4. A plurality of fuse insertion ports (fuse cavities) R of the fuse mounting portion are formed by both of the partition walls 7 and 4.

A block terminal 8 is integrally formed on the fuse mounting block 6 by insert or outsert molding of synthetic resin. The block terminal 8 is
As shown in FIG. 8, an electric wire connecting portion 8a having a press contact structure to which electric wires of the wiring board 9 are connected by press contact and a fuse side contact portion 8b having a press contact structure are provided. Each wire connecting portion 8a projects upward from the upper surface of the fuse mounting block 6, and each fuse connecting portion 8b is arranged so as to face between the adjacent upper partition walls 7, 7.

The wiring board 9 has a shape that can be fitted into and removed from the fitting walls 2b, 2b on both sides of the upper surface of the under cover 1, and is arranged above the bus bar 5 and the fuse mounting block 6. There is. The upper side of the wiring board 9 is closed by an upper cover (not shown), and the upper cover is locked by the under cover 1.

In the above structure, the bus bar 5 is installed on the stepped bottom surface 2a of the block housing chamber 2 of the under cover 1, and then the guide projection 6a of the fuse mounting block 6 is provided.
Are aligned with the respective guide grooves 3a of the side walls 3 and 3, and the fuse mounting block 6 is fitted into the block accommodating chamber 2, the fuse mounting block 6 is located on the bus bar 5 and the upper side of each fuse mounting block 6. The lower surface of the partition wall 7 abuts on the upper surface of each lower partition wall 4 of the block housing chamber 2 to form a plurality of fuse insertion ports R, respectively. Next, the wiring board 9 is fitted, and finally, the upper cover is covered from above and the upper cover is locked to the under cover 1 to complete the assembly.

A similar technique for this electric junction box is as follows.
It is disclosed in Japanese Patent Application No. 9-89617.

[0010]

However, in the above-mentioned conventional electrical junction box, since the fuse insertion port R of the fuse mounting portion is formed by the fuse mounting block 6 and the block accommodating chamber 2 of the under cover 1, When there is a dimensional error or the like in either of the members 1 and 6 or an external force is applied, the lower surface of each upper partition wall 7 of the fuse mounting block 6 is blocked as shown by the phantom line in FIG. It may not be accurately aligned with the upper surface of each lower partition wall 4 of the accommodation chamber 2. For this reason, the substantial opening width of the fuse insertion port R becomes small, which may impair the detachability of the fuse (not shown).

Further, the fuse mounting block 6 in the fuse insertion port R is restricted in its movement in the detaching direction (upward direction) only by the locking of the upper cover, and therefore the dimensions of the members 1 and 6 are determined. If there is an error or the like, the fuse block 6 can move upward in the block accommodating chamber 2. As described above, when the fuse mounting block 6 is allowed to move upward and the fuse mounting block 6 floats upward, the substantial height of the fuse insertion port R increases, and the fuses and the respective fuses of the bus bar 5 are increased. There is a possibility that the contact state between the connection terminal portion 5a and the fuse connection portion 8b of each block terminal 8 deteriorates, and the conduction state deteriorates.

Therefore, the present invention has been made to solve the above-mentioned problems, and the substantial opening width of the fuse insertion port of the fuse mounting portion is always constant, so that the detachability of the fuse is improved and the fuse is improved. It is an object of the present invention to provide an electrical connection box that prevents the electrical continuity failure of the above.

[0013]

According to a first aspect of the present invention, a recess is provided on one side surface side of a cover, and a plurality of fuse connecting terminal portions of the bus bar are arranged side by side on the one side surface side of the bottom surface of the recess. A fuse mounting block having a plurality of block terminals arranged side by side is fitted in the upper recess, and each fuse connecting terminal portion of the bus bar and the fuse connecting portion of each block terminal are opposed to each other to face each other. In the electrical connection box described above, the fuse insertion port of the fuse mounting portion is formed in the fuse mounting block.

In this electrical junction box, the fuse mounting block is fitted in the recess of the cover, and the fuse insertion port of the fuse mounting portion is located on the fuse mounting block side even if there is a dimensional error or the like between the cover and the fuse mounting block. The partition wall forming the fuse insertion hole is prevented from being displaced at its intermediate portion unlike the conventional case.

According to a second aspect of the present invention, there is provided the electrical junction box according to the first aspect, wherein a locking portion is provided on a lower wall portion of the fuse mounting block forming the fuse insertion port while the cover is provided. An engaging portion for engaging the engaging portion is provided on the bottom surface side of the concave portion where the lower wall portion abuts.

In this electric connection box, in addition to the operation of the invention of claim 1, the engagement portion of the fuse mounting block is engaged with the engagement portion of the cover when the fuse mounting block is fitted in the recess of the cover. Therefore, the fuse mounting block does not move in the detaching direction even when an external force acts on the fuse mounting block in the direction of detaching from the recess of the cover.

According to a third aspect of the present invention, in the electric junction box according to the second aspect, the bottom surface of the concave portion of the cover is formed in a step shape, and the bus bar is bent and formed in accordance with the bottom surface of the step shape. The bent bus bar is arranged along the bottom surface of the recess.

In this electric junction box, in addition to the operation of the invention of claim 2, the bent state of the busbar does not coincide with the step of the step-like bottom surface of the concave portion of the cover, and the busbar is corrected so that the concave portion of the cover is formed. The elastic return reaction force is routed along the stepped bottom surface, and even if an external force is applied to the fuse mounting block in the direction to separate it from the recess of the cover, the locking portion of the fuse mounting block acts as the engaging portion of the cover. Since it is locked, the fuse mounting block does not move in the detaching direction.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of an essential part of an electrical junction box such as a junction box according to an embodiment of the present invention, and FIG. 2 is a partially exploded perspective view of the junction box in the vicinity of a fuse insertion port.
FIG. 3 is a perspective view of a fuse mounting block used in the junction box, and FIG. 4 is a partial sectional view showing a locked state of the fuse mounting block and the under cover.

1 to 4, in this embodiment, the same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted, and only different components will be described. That is, the fuse mounting block 6 made of synthetic resin is integrally formed with a partition wall 10 having a size including not only the upper partition wall as in the conventional example but also the lower partition wall in the conventional example, and a plurality of partition walls. A lower wall portion 11 is integrally formed on the lower surface of 10.
The plurality of partition walls 10 and the lower wall portion 11 form a plurality of fuse insertion ports (fuse cavities) R of the fuse mounting portion integrally with the fuse mounting block 6. Thereby, the lower part of the partition wall 10 and the lower wall part 1
One portion is a side surface L-shaped protruding portion 12 that protrudes lower than the other portions. In addition, 3 of the lower surface of the lower wall portion 11
Flexible locking claws (locking portions) 13 protruding downward at the places
Are formed integrally with each other, and each of the locking claws 13 has a substantially triangular side surface-shaped triangular locking projection 13a at the tip thereof.

Undercover (cover) 1 made of synthetic resin
No lower partition wall is formed on the stepped bottom surface 2a of the block accommodating chamber (recess) 2 as in the conventional example, and this portion is the lowest step portion 14 which is one step lower than the other portions. In the fitted state of the fuse mounting block 6, the protruding portion 12 of the fuse mounting block 6 is inserted into this lowest step portion 14. Rectangular engaging holes 15 as engaging parts for locking the flexible engaging claws 13 are formed at three positions of the lowest step portion 14, and as shown in FIG. The inner surface of the dowel hole 15 has the locking projection 1 of the locking claw 13.
An engaging projection 15a for locking 3a is integrally formed. That is, in the conventional example, since the upper partition walls are provided in the fuse mounting block 6 and the lower partition walls are provided in the under cover 1 in order to form the plurality of fuse insertion ports R of the fuse mounting portion, the locking means is provided. Although there were no places to be provided, in the present embodiment, the plurality of fuse insertion ports R are integrally formed on the fuse mounting block 6 side so that both members 6 and 1 are provided with the locking means 13 and 15, respectively. It was made possible.

Next, the assembling procedure of the above configuration will be described.
Stepped bottom surface 2 of the block housing chamber 2 of the under cover 1
The bus bar 5 is routed along the upper side of a, and then the guide protrusions 6a of the fuse mounting block 6 are aligned with the guide grooves 3a of the side walls 3 and 3 so that the fuse mounting block 6 is placed in the block accommodating chamber 2. When fitted, fuse mounting block 6
The protrusion 12 enters the lowest step 14 on the one side surface 1a side of the block housing chamber 2 of the under cover 1, and the flexible locking claw 13 of the fuse mounting block 6 engages the engagement hole of the under cover 1. Go into 15. Then, when the protruding portion 12 of the fuse mounting block 6 is fitted until it comes into contact with the lowest step portion 14 of the block accommodating chamber 2 of the under cover 1, the locking protrusion 13a of the locking claw 13 is locked.
5 is engaged with the engagement protrusion 15a. Next, the wiring board 9 is fitted, and finally the upper cover is covered from above and the upper cover is locked to the under cover 1, whereby the assembly is completed.

Here, even if there is a dimensional error or the like between the under cover 1 and the fuse mounting block 6, the plurality of fuse insertion ports R of the fuse mounting portion are provided with the fuse mounting block 6.
Since it is formed only on the side, the partition wall 10 forming the fuse insertion port R is not displaced in the middle portion as in the conventional case, and the substantial opening width of the fuse insertion port R is always maintained. It becomes constant, and the detachability of the fuse (not shown) is improved. Further, since the central mating surface of the fuse insertion port R as in the conventional case cannot be seen from the outside, aesthetics can be enhanced.

In the state where the fuse mounting block 6 is fitted in the block accommodating chamber 2 of the under cover 1,
Since the flexible locking claw 13 of the fuse mounting block 6 is locked in the engagement hole 15 of the under cover 1, an external force in a direction (upward) of separating from the block accommodating chamber 2 acts on the fuse mounting block 6. This fuse mounting block 6
Does not move in the detaching direction, and the opening height of the fuse insertion port R can always be kept constant.
The fuse connection terminal portion 5a and the fuse connection portion 8b of each block terminal 8 do not have a poor contact with the fuse. Further, since the lower wall portion 11 is also provided as a member that forms the fuse insertion port R, the fuse mounting block 6 is temporarily used.
Even if is displaced, the opening height of the fuse insertion port R can always be kept constant.

On the other hand, FIG. 5 is a schematic side view of the fuse mounting block 6, the bus bar 5, and the under cover 1. Figure 5
In the above, the bent state of the bus bar 5 does not coincide with the step of the step-shaped bottom surface 2a of the block housing chamber 2b of the under cover 1, and such a bus bar 5 corrects the block housing chamber 2 of the under cover 1. When arranged along the step-shaped bottom surface 2a, this elastic return reaction force acts on the fuse mounting block 6 in the direction of separating from the block accommodating chamber 2 (upward direction). However, since the locking claw 13 of the fuse mounting block 6 is locked in the engagement hole 15 of the under cover 1, the fuse mounting block 6 does not move in the detaching direction (upward direction). As a result, it is possible to make a large angle tolerance when the bus bar 5 is bent.

According to the above-mentioned embodiment, a locking claw as a locking portion is integrally formed on the side of the hube mounting block,
Although a rectangular engaging hole was formed as an engaging part on the cover side,
Of course, the locking portion may be a rectangular locking hole, and the engaging portion may be an engaging protrusion locked in the locking hole.

[0028]

As described above, according to the first aspect of the invention, since the fuse insertion port of the fuse mounting portion is formed on the fuse mounting block side, when the fuse mounting block is fitted in the recess of the cover. In addition, even if there is a dimensional error or the like between the cover and the fuse mounting block, the partition wall forming the fuse insertion port will not be displaced at the intermediate portion as in the conventional case, and the fuse insertion port will not be displaced. It is possible to always maintain a constant opening width. This makes it possible to further improve the detachability of the fuse.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, when the fuse mounting block is fitted in the concave portion of the cover, the locking portion of the fuse mounting block has the engaging portion of the cover. Since the fuse mounting block does not move in the detaching direction even when an external force is applied to the fuse attaching block in the detaching direction from the recess of the cover, the opening height of the fuse insertion port is always constant. Can be maintained at. As a result, the fuse connection terminals of the bus bar and the fuse connection portions of the block terminals do not have poor contact with the fuses.

According to the invention of claim 3, in addition to the effect of the invention of claim 2, the bent state of the bus bar does not match the step of the stepped bottom surface of the concave portion of the cover, and the bus bar corrects the cover. Even if the elastic return reaction force is applied to the fuse mounting block in the direction of separating from the recess of the cover, the locking portion of the fuse mounting block is arranged along the stepped bottom surface of the recess, and the locking portion of the fuse mounting block engages with the engaging portion of the cover. Since the fuse mounting block does not move in the detaching direction, the fuse mounting block does not move. As a result, it is possible to have a large angle tolerance when the bus bar is bent.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main part of an electrical junction box according to an embodiment of the present invention.

FIG. 2 is a partially exploded perspective view of the electric junction box in the vicinity of a fuse insertion port.

FIG. 3 is a perspective view of a fuse mounting block used in the electric junction box.

FIG. 4 is a cross-sectional view showing a locked state of the fuse mounting block and the under cover.

FIG. 5 is a schematic side view of the fuse mounting block, bus bar, and under cover.

FIG. 6 is an exploded perspective view of a main part of a conventional electrical junction box.

FIG. 7 is an enlarged perspective view of a fuse mounting block used in the conventional electrical connection box.

FIG. 8 is an enlarged perspective view of a block terminal used in the fuse mounting block of the conventional example.

FIG. 9 is a partial perspective view in the vicinity of a fuse mounting portion of the electrical connection box of the conventional example.

[Explanation of symbols]

1 Undercover (cover) 1a One side 2 block storage chamber (recess) 2a bottom 5 Busbar 5a Fuse connection terminal 6 Fuse mounting block 8 block terminals 8a Fuse connection part 10 partition walls 11 Lower wall 13 Locking claw (locking part) 15 Engagement hole (engagement part) R fuse insertion port

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-3618 (JP, A) JP-A-9-106748 (JP, A) JP-A-11-146533 (JP, A) JP-A-10- 285750 (JP, A) Actual Kaihei 4-61417 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02G 3/16 H01R 4/58

Claims (3)

(57) [Claims] 1. A recess is provided on one side of a cover, a plurality of fuse connecting terminal portions of a bus bar are arranged in parallel on the one side of the bottom surface of the recess, and a plurality of block terminals are arranged in the recess on the bus bar. Fit the installed fuse mounting block,
In the electrical connection box, in which each fuse connection terminal portion of the bus bar and the fuse connection portion of each block terminal are opposed to each other to form a fuse attachment portion, the fuse insertion port of the fuse attachment portion is the fuse attachment block. An electrical junction box characterized by being formed in. 2. The electrical junction box according to claim 1, wherein the lower wall portion forming the fuse insertion port of the fuse mounting block is provided with a locking portion while the lower portion of the recess of the cover is provided. An electrical junction box, wherein an engaging portion for locking the locking portion is provided on a bottom surface side with which the wall portion abuts. 3. The electrical junction box according to claim 2, wherein the bottom surface of the concave portion of the cover is formed in a step shape, the bus bar is bent and formed in accordance with the bottom surface of the step shape, and the bent bar is formed. An electrical junction box, wherein bus bars are arranged along the bottom surface of the recess.