JP3175496B2 - Fixing structure of 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 fixing structure, and more particularly, to a junction box (J / B),
The present invention relates to a fixing structure for fixing an electric connection box such as a relay box (R / B) and a fusible link box (FL / B) to a case attached to a vehicle body of an automobile.

[0002]

2. Description of the Related Art Conventionally, J / B, R / B, and the like for forming a circuit for connecting an automobile wire harness to an electrical component have been developed.
Various electrical junction boxes such as FL / B are provided. FIG.
Fig. 1 shows an example of a fixing structure for mounting this type of electric junction box on a vehicle body in an engine room or the like. In the drawing, reference numeral 1 denotes a bottomed box-shaped resin case which is fixed to a vehicle body (not shown) by bolts in advance.
2B protrudes. Connect these bolts 2A and 2B to J / B3
The nut 4 is inserted into the insertion hole 3b provided in the mounting portion 3a.
A and 4B are screwed into the bolts 2A and 2B, so that J
/ B3 is fixed to case 1. FL / B6 and R / B
7A, 7B and 7C are locked to the J / B by known locking means.

The upper opening 1 a of the case 1 is closed by an upper cover 8. A waterproof structure is formed between the upper cover 8 and the upper end of the case 1,
The inside of the case 1 is sealed.

[0004]

When the J / B is fixed to the vehicle body with bolts and nuts as described above, it is necessary to use a tool such as an impact for tightening the bolts or nuts, so that the mounting work is troublesome. It is. In this case, the cost of parts for the bolts and nuts and the processing cost for fixing the bolt to the case are required, which leads to an increase in manufacturing cost. Further, when the above-described fixing structure is adopted, it is necessary to provide the J / B3 with the mounting portion 3a in which the insertion hole 3b is formed, so that the wiring area of the bus bar (not shown) in the J / B3 or the like is required. , The number of components mounted on the J / B is limited. The present invention solves the above-described problems in the conventional structure for fixing an electric junction box, and enables the electric junction box to be mounted on a vehicle body without using a tool, and free circuit structure in the electric junction box. An object of the present invention is to provide a structure for fixing an electric junction box with less restrictions on the degree and the number of mounted components.

[0005]

In order to achieve the above object, according to the present invention, an electric connection box is housed and fixed in a case, and an upper opening of the case is closed with an upper cover. The electric connection box is fixed in a sealed state with a case and an upper cover, wherein a lock portion is provided on an inner wall surface of a side wall of the case, and a lock piece is provided on a side surface of a housing of the electric connection box. Locking the lock piece to the lock portion of the case, locking the electric connection box inside the case, and further engaging with the outer surface of the side wall of the case and the outer surface of the peripheral wall of the upper cover. Means, and a tubular or solid columnar pressing member is protruded from the inside of the upper bottom of the upper cover, and the pressing is performed in a state where the upper cover is fastened to the case by the fastening means. The distal end surface of the parts is providing fixed structure of the electric connection box, characterized in that it is configured to press the upper surface of the electrical connection box.

According to a second aspect of the present invention, there is provided a fixing structure for an electric connection box according to the first aspect, wherein a packing member is provided inside the peripheral wall of the upper cover, the packing member being in contact with an upper end of the case. Is what you do.

[0007]

In the structure for fixing an electric connection box according to the first aspect, when the locking means is engaged and the upper cover is put on the case and tightened by the tightening means, the holding portion provided on the upper cover allows the electric connection box to be fixed. Since the upper surface is pressed, the electric connection box is fixed to the case without rattling of the locking means. Therefore, according to the fixing structure of the first aspect, it is not necessary to use a tool for fixing the electric connection box.
Further, the locking means can be formed integrally with the housing or the case of the electric connection box, and the holding portion can be formed integrally with the upper cover, so that another component for fixing the electric connection box is not required. .

In the case where a packing member is provided inside the peripheral wall portion of the upper cover such that the upper end of the case abuts, the packing member is pressed when the upper cover is pressed against the case by the fastening means. Is pressed by the upper end of the case and is elastically deformed, so that the clearance of the locking means is absorbed, and rattling of the locking means is more reliably prevented.

[0009]

Next, the present invention will be described in detail with reference to the embodiments shown in the drawings. In FIG. 1 and FIG. 2, reference numeral 10 denotes a box with a bottom and made of resin. The case 10 is fixed to the vehicle body side in advance by bolting, and the upper opening 10a of the case 10 is closed by an upper cover 11 to seal the inside of the case 10. J / B12 and R /
B13 is housed in this case 10.

The J / B 12 has locking portions 1 for fixing to side surfaces 14a, 14b and 14c of the housing 14, respectively.
5A, 15B and 15C are provided. Lock part 15
A, 15B, and 15C are well-known structures, and as shown in FIGS.
b, 14c, a lock piece 1 projecting upward like a cantilever
6 and guide recesses 17A,
17B is provided. Further, a lock projection 18 is provided at the tip of the lock piece 16.

On the other hand, the side walls 19a, 19 of the case 10
b, 19c, the cross-sectional shape of the J / B 12 corresponding to the lock portions 15A, 15B, 15C of the J / B 12 when viewed from the fitting direction is substantially T-shaped (slide shoe shape). Ridges 20A, 20B extending in the vertical direction,
20C is provided. The projections 20A, 20B, 20
C is a neck 2 projecting from the side walls 19a, 19b, 19c.
1 and a head 22 projecting to both sides at the tip of the neck 21. Lock grooves 23A, 23B and 23C whose upper ends are closed are formed in the head 22.

The lock portions 15A to 15C and the lock groove 2
3A to 23B constitute locking means 24 for connecting the J / B 12 and the case 10, and are engaged as shown in FIG. That is, the heads 22 of the ridges 20A to 20C are inserted into the guide recesses 17A and 17B of the locks 15A to 15C, and the lock pieces 16 elastically bend and lock projections 18.
The upper surface 18a of the head 22 engages with the ends 25 of the lock grooves 23A to 23C, and the upper end 22a of the head 22 is
The lock portions 15A to 15C and the lock grooves 23A to 23C are locked to each other by abutting on the end portions 26 of A and 17B.

The distance A between the upper surface 18a of the lock projection 18 and the end 26 of the guide recess 17A, 17B is determined by the distance between the end 26 of the lock groove 23A to 23C and the upper end of the head 22 of the ridge 20A to 20C. The distance B is set to be larger by C than the distance B from the center 22a. By providing the clearance C, the lock portions 15A to 15C and the lock grooves 23A to 2
3C can be smoothly engaged.

In the vicinity of the ridges 20A to 20C provided with the lock grooves 23A to 23C, there are provided pedestals 28A, 28B and 28C extending in the vertical direction in the drawing, and these pedestals 28A to 28C are provided. The lower end of the J / B 12 is supported by the flat upper end surface 29.

The R / B 13 has a lock portion 34 for attaching to the J / B 12 on the side surface 33a of the housing 33.
A, 34B. The lock portion 3 of the R / B 13 is provided on a side surface 14 d of the housing 14 of the J / B 12.
Lock grooves 35A and 35B at positions corresponding to 4A and 34B.
Are provided. The structures of the lock portions 34A and 34B, the lock grooves 35A and 35B, and the ridges 36A and 36B are the same as those described above in J / B1.
2 has the same structure as the lock portions 15A to 15C, the lock grooves 23A to 23C of the case 10, and the ridges 20A to 20C. 37 and 38 in the figure are J / B12 and R / B1.
3 is a connection means for electrically connecting 3 to each other. Further, a pedestal portion 28D for supporting the R / B 13 is provided on the side wall 19d of the case 10.

As shown in detail in FIG. 5, the upper cover 11 has an upper bottom portion 11a having a concave cross section and an upper bottom portion 11a.
And a peripheral wall portion 11b surrounding the lower end. A pair of holding portions 4 are provided on the inner surface of the upper bottom 11a at intervals.
0A and 40B protrude. These holding parts 40A, 4
0B is a tapered circular tube whose diameter gradually decreases from the upper bottom portion 11a side toward the distal end surface 41, and the distal end surface 41 is a flat surface. The position where the holding portions 40A and 40B are provided is such that when the upper cover 11 is put on the case 10 as described later, the tip surface 41 is provided on a flat portion of the upper surface 14e of the housing 14 of the J / B 12 where the connector portion 42 and the like are not provided. Is set to abut.

A groove 43 is formed all around the inside of the peripheral wall 11b.
And a packing member 44 is mounted in the groove 43. The packing member 44 is made of rubber, foamed silicon,
It is made of an elastic material such as foamed polyurethane. Further, the thickness t of the packing member 44 is determined by setting the upper cover 11 to the case 1.
0 over the upper opening 10a, and tightening means 50 to be described later.
Thus, when the upper cover 11 is pressed against the case 10, the packing member 11 compressed by the upper end 10 b of the case 10 is set so as not to lose elasticity.

A lock claw 45 is provided on the outer side of the peripheral wall 11b. The lock claw 45 is provided in the case 1
The upper cover 11 is locked to the case 10 by engaging with the inverted U-shaped lock arm 46 provided on the side wall 14 of the “0”. Also, on the opposite side of the peripheral claw portion 45 of the peripheral wall portion 11b,
A buckle receiving recess 47 is provided. Side wall 14 facing the side wall 14 a of the case 10 provided with the lock arm 46.
In (c), an end of a buckle member 49 formed of a leaf spring having a bent portion 49a is rotatably supported. The buckle member 49 and the buckle receiving recess 47 constitute a fastening means 50, and the buckle member 49 is rotated in a state where the upper cover 11 is put on the upper opening 10a of the case 10 so that the bent portion 49a is bent. When fitted into the buckle receiving recess 47, the lock claw 45 and the lock arm 46 are engaged, and the upper cover 11 is pressed against the case 10b.

In this embodiment, J / B 12 is
0, first, the lock portions 34A, 3A
4B and the lock grooves 35A and 35B, and
13 is attached to J / B12. Next, the upper opening 10a
J / B12 with the above R / B13 attached to the case 10
And the ridges 20A-2 corresponding to the guide recesses 17A, 17B of the locks 15A-15C of the J / B12.
Insert the head 22 at 0C. As the head 22 is inserted, the lock pieces 16 that come into contact with the head 22 are elastically bent, and the lock projections 18 are fitted into the lock grooves 23A to 23C, and the lock portions 15A to 15C and the lock grooves 23A to 23
C are locked together, and J / B 12 is attached to case 10.

Next, the upper cover 11 is
0 upper opening 10a. In this state, the upper end 10b of the case 10 comes into contact with the packing member 44, and the front end surfaces 41 of the holding portions 40A, 40B are J / B
11 is in contact with the upper surface 14e of the housing 14,
The lock claw 45 and the lock arm 46 are not engaged.

Next, when the buckle member 49 is rotated to fit the bent portion 49e into the buckle receiving recess 47, the upper cover 11 is pressed against the case 10 as shown by an arrow P in the figure. At this time, the packing member 44 is pressed by the upper end 10b of the case 10 to be elastically compressed, and the upper cover 11 is displaced toward the case 10. By pressing the upper cover 11 against the case 10 in this manner, the upper surface 14 of the housing 14 of the J / B 11 is formed.
Pressing portions 40A and 40B abutting against e press upper surface 14e of housing 14 of J / B 12 downward in the drawing.
Therefore, the ends 25 of the guide recesses 17A and 17B are pressed against the tips of the heads 22 of the ridges 20A to 20C, and the lower surface of the J / B 12 is pressed against the end surface 29 of the pedestals 28A to 28B. Is firmly fixed to the case 10. Thus, in this embodiment, the packing member 4
4 is elastically deformed, the clearance C
Is absorbed, and the lock portions 15A to 15C of the J / B 12 and the lock grooves 23A to 23C of the case 10 engage with each other without play.

In the fixing structure of this embodiment, J / B1
The lock portions 15A to 15C of the case 2
J / B12 is changed to case 10 only by engaging with A to 23C.
, And there is no need to use tools such as impacts, and the mounting work is simple. Further, as described above, the packing member 44 absorbs the clearance C, and
Since the / B12 does not rattle in the case 10, it is possible to prevent the generation of abnormal noise due to vibration and the function of components such as the relay in the J / B12 from being damaged and the occurrence of a thermal problem at the contact portion.

Further, in the fixing structure of this embodiment, J / B
Lock portions 15A to 15 provided on the housing 14
C, the lock grooves 23A to 23C provided in the case 10 are:
Holding portions 40A, 40B provided on upper cover 11
Are the housing 14 and the case 10 of the J / B 12
Can be integrally formed at the time of resin molding, and the bolts 2A and 2B, the nuts 4A and 4A in the conventional fixing structure shown in FIG.
Since separate parts such as 4B are not required, the cost of parts for such bolts and nuts and the processing cost for projecting the bolts into the case 10 are unnecessary, and the manufacturing cost can be reduced.

Furthermore, when the fixing structure of this embodiment is adopted, it is not necessary to provide the J / B 12 with the mounting portion 3a having the insertion hole 3b formed therein as in the conventional fixing structure shown in FIG. Since the lock portions 15A to 15C may be provided on the side surfaces 14a to 14c of the housing 14, there are few restrictions on the degree of freedom in arranging bus bars in the J / B 12 and the number of components mounted on the J / B.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, the holding portions 40A and 40B are tapered circular tubes, but the shape of the holding portion is not limited to this, and the holding portions 40A and 40B protrude from the upper bottom 11a of the upper cover.
/ B12 as long as it can press the housing 14
It may be a straight circular tube, a triangular tube, a rectangular tube, a polygonal tube without a taper, or a solid columnar shape such as a tapered column, a column, a triangular column, a rectangular column, a polygonal column. In the above embodiment, the lock portions 15A to 15C are provided on the housing 14 side of the J / B 12 and the lock grooves 23A to 23C are provided on the case 10 side.
May be provided with a lock groove, and the case 10 may be provided with a lock portion. The lock means 24 for locking the J / B 12 and the case 10 is provided with the lock portions 15A to 15C and the lock groove 23.
The locking means is not limited to A to 23C, and may have any structure as long as the J / B 12 can be locked to the case 10. Further, in the above embodiment, the J / B 12 is fixed to the case 10. However, the fixing structure of the present invention is not limited to the J / B, but may be applied to various electric connection boxes such as R / B and FL / B. Can be applied.

Further, the fastening means 50 for pressing the upper cover 11 against the upper end of the case 10 is not limited to the buckle member 49 and the buckle receiving recess 47, but may press the upper cover 11 against the upper opening 10a of the case 10. Anything can be used.

[0027]

As is clear from the above description, in the fixing structure for an electric junction box according to the first aspect, the locking means is engaged, the upper cover is put on the case, and the upper cover is closed by the fastening means. , The electric connection box can be fixed to the case, and it is not necessary to use a tool such as an impact to fix the electric connection box, and the fixing operation is simple.

Further, in the fixing structure of the first aspect, the locking means can be formed integrally with the housing or the case of the electric connection box, and the holding portion can be formed integrally with the upper cover. Since separate parts such as bolts and nuts are not required to fix the connection box,
There is no need for the cost of parts for such bolts and nuts and the processing cost for fixing the bolts to the case, so that manufacturing costs can be reduced.

Further, when the fixing structure of the first aspect is adopted, there is no need to provide a mounting portion having a through hole in the electric connection box as in the conventional fixing structure. There are few restrictions on the degree of freedom and the number of components that can be mounted on the electrical junction box.

Further, in the fixing structure according to the first aspect, since the electric connection box is pressed by the pressing portion provided on the upper cover, no rattling occurs in the locking means, and abnormal noise is generated by vibration. Or the function of the components of the electrical junction box is not impaired, and no thermal problem occurs at the contact portion.

In the case where the packing member is attached to the inside of the peripheral wall of the upper cover as in claim 2, the upper cover is pressed against the case by the fastening means. Is pressed by the upper end of the case and is elastically deformed, so that the clearance of the locking means is absorbed, the play of the locking means is more reliably prevented, and the electric connection box can be firmly fixed to the case.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a fixing structure according to an embodiment.

FIG. 2 is an exploded perspective view showing a fixing structure according to the embodiment.

FIG. 3 is an exploded perspective view showing a lock unit.

FIG. 4 is a partial cross-sectional view showing a lock unit.

FIG. 5 is a sectional view showing an upper cover.

FIG. 6 is an exploded perspective view showing a conventional fixing structure.

[Explanation of symbols]

 10 Case 11 Upper Cover 12 J / B (Electrical Connection Box) 13 R / B 14 Housing 15A to 15C, 34A, 34B Lock Part 20A to 20C, 35A, 35B Ridge 23A to 23C, 36A, 36B Lock Groove 24 Tightening Attaching means 28A to 28D Pedestal portions 40A, 40B Pressing portions 41 Tip surface 50 Locking means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 3/08 B60R 16/02

Claims (2)

(57) [Claims] (1)Housing and fixing the electrical junction box inside the case
At the same time, close the upper opening of the case with the upper cover
And seal the electrical junction box with a case and upper cover.
It is fixed in a state where When a lock is provided on the inner side wall of the side wall of the case,
A lock piece on the side of the housing of the electrical junction box.
The lock piece is locked to the lock portion of the case, and
Lock the above electrical junction box inside the case, Between the outer surface of the side wall of the case and the peripheral wall of the upper cover.
Fastening means for engaging with each other on the outer surface;
Tubular or solid column shape from the inside of the upper bottom of the upper cover
A holding member is protruded, and the upper cover is
Above with the case fastened Make sure that the tip of the
Press the top of the air junction boxHave a configurationIt is characterized by
Electrical junction box fixing structure. 2. Inside the peripheral wall of the upper cover,
2. The fixing structure for an electric connection box according to claim 1, wherein a packing member is attached to the case so that the upper end of the case contacts the case.