JPH08107615A - Fixing structure for electric connection box - Google Patents

Abstract

PURPOSE: To provide the fixing structure of an electric connection box in which the box can be fixed without using a tool and the restrictions in the degree of freedoms of a circuit structure in the box and the number of placed components are small. CONSTITUTION: Locking means 50 for coupling the side of the housing of an electric connection box 12 to the sidewall of a case 10 is provided. Tubular or solid columnar retainers 40A, 40B protrude from the side of an upper cover 11 for closing the upper opening 10a of the case. Clamping means 50 for pressing the cover to the case is provided. The end face 41 of the retainer presses the upper surface of the box.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing structure for an electric junction box, more specifically, 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 for forming a circuit for connecting an automobile wire harness to electrical equipment,
Various electrical junction boxes such as FL / B are provided. Figure 6
Shows an example of a fixing structure for mounting this type of electrical junction box to a vehicle body in an engine room or the like. In the figure, reference numeral 1 denotes a box-shaped case made of resin, which is fixed to a vehicle body (not shown) in advance by bolting, and has a bolt 2A,
2B is projected. Replace these bolts 2A and 2B with J / B3
Insert the nut 4 into the insertion hole 3b provided in the mounting part 3a
By screwing A and 4B onto bolts 2A and 2B, J
/ B3 is fixed to the case 1. FL / B6 and R / B
7A, 7B and 7C are locked to J / B by a known locking means.

The upper opening 1a 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 fixing the J / B to the vehicle body with the bolts and nuts as described above, it is necessary to use a tool such as an impact tool for tightening the bolts or nuts, which makes the mounting work troublesome. Is. Further, in this case, the parts cost of the bolt and nut 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 fixing structure is adopted, it is necessary to provide the J / B 3 with the mounting portion 3a having the insertion hole 3b. Therefore, the routing area of the bus bar (not shown) in the J / B 3 or the like. , J / B is limited in the number of parts to be mounted. INDUSTRIAL APPLICABILITY The present invention solves the problems in the conventional fixing structure of the electric junction box, allows the electric junction box to be mounted on the vehicle body without using a tool, and allows the circuit structure in the electric junction box to be free. The purpose of the present invention is to provide a fixing structure for an electric junction box, which has less restrictions on the number of parts and the number of parts to be mounted.

[0005]

Therefore, a first aspect of the present invention is a fixing structure for fixing an electric connection box in a case, and a lock for connecting a side surface of a housing of the electric connection box and a side wall of the case. Means, an upper cover for closing the upper opening of the case, a tubular or solid columnar pressing portion protruding inside the upper cover, and a fastening means for pressing the upper cover to the case, The present invention provides a fixing structure for an electric connection box, wherein the tip surface of the pressing portion presses the upper surface of the electric connection box.

According to a second aspect of the present invention, there is provided a fixing structure for an electrical junction box according to the first aspect, wherein a packing member with which the upper end of the case abuts is attached inside the peripheral wall portion of the upper cover. To do.

[0007]

In the electric junction box fixing structure according to the first aspect of the present invention, when the locking means is engaged and the upper cover is put on the case and tightened by the tightening means, the pressing portion provided on the upper cover secures the electric junction box. Since the upper surface is pressed, the electric connection box is fixed to the case without rattling of the locking means. Therefore, with the fixing structure according to the first aspect, it is not necessary to use a tool for fixing the electric junction box.
Further, the locking means can be formed integrally with the housing or case of the electric junction box, and the pressing portion can be formed integrally with the upper cover, so that no separate component for fixing the electric junction box is required. .

When a packing member with which the upper end of the case abuts is attached to the inside of the peripheral wall portion of the upper cover as claimed in claim 2, when the upper cover is pressed against the case by the fastening means, the packing member is attached. Is elastically deformed by being pressed by the upper end of the case, so that the clearance of the lock means is absorbed and rattling of the lock means is more reliably prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in the drawings. In FIGS. 1 and 2, reference numeral 10 denotes a box-shaped bottomed resin case. The case 10 is previously fixed to the vehicle body side by bolting, and the upper opening 10a of the case 10 is closed by an upper cover 11 to hermetically seal the inside of the case 10. J / B12 and R /
B13 is housed in this case 10.

The J / B 12 has lock portions 1 for fixing to the side surfaces 14a, 14b, 14c of the housing 14, respectively.
5A, 15B and 15C are provided. The lock part 15
A, 15B and 15C have known structures, and as shown in FIGS. 3 and 4, side surfaces 14a and 14 of the housing 14 are shown.
Lock piece 1 projecting upward in a cantilever shape from b and 14c
6 are provided on both sides of the lock piece 16 and guide recesses 17A,
17B is provided. A lock projection 18 is provided on the tip of the lock piece 16.

On the other hand, the side walls 19a, 19 of the case 10 are
On the inner wall surface of b, 19c, the cross-sectional shape seen from the fitting direction is a substantially T-shape (slide shoe shape) at a position corresponding to the lock portion 15A, 15B, 15C of the J / B 12, and in the drawing. Ridges 20A, 20B extending in the vertical direction,
20C is provided. These protrusions 20A, 20B, 20
C is a neck portion 2 protruding from the side walls 19a, 19b, 19c.
1 and a head portion 22 projecting to both sides at the tip of the neck portion 21. The head 22 is formed with lock grooves 23A, 23B and 23C whose upper ends are closed.

The lock portions 15A to 15C and the lock groove 2
3A to 23B form a locking means 24 that connects the J / B 12 and the case 10, and are engaged as shown in FIG. That is, the heads 22 of the protrusions 20A to 20C are inserted into the guide recesses 17A and 17B of the lock portions 15A to 15C, and the lock pieces 16 elastically bend to lock the lock protrusions 18.
The upper surface 18a of the lock groove 23A-23C is engaged with the upper surface 18a of the lock groove 23A-23C, and the upper end 22a of the head 22 is guided by the guide recess 17
By contacting the end portions 26 of A and 17B, the lock portions 15A to 15C and the lock grooves 23A to 23C are locked to each other.

The distance A between the upper surface 18a of the lock projection 18 and the ends 26 of the guide recesses 17A and 17B is set to be the upper end of the ends 26 of the lock grooves 23A-23C and the head 22 of the ridges 20A-20C. The distance C is set to be larger than the distance B to 22a. By providing the clearance C, the lock portions 15A to 15C and the lock grooves 23A to 2C are provided.
3C can be engaged smoothly.

Near the protrusions 20A to 20C provided with the lock grooves 23A to 23C, pedestals 28A, 28B and 28C extending in the vertical direction in the drawing are provided, and these pedestals 28A to 28C are arranged. A flat upper end surface 29 supports the lower surface side of the J / B 12.

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 and 34B are provided. Further, the lock portion 3 of the R / B 13 is provided on the side surface 14d of the housing 14 of the J / B 12.
Lock grooves 35A, 35B at positions corresponding to 4A, 34B
The ridges 36A and 36B provided with are provided. The structures of the lock portions 34A and 34B, the lock grooves 35A and 35B, and the ridge portions 36A and 36B are the same as those described in J / B1.
It has the same structure as the second lock portions 15A to 15C, the lock groove portions 23A to 23C and the protruding portions 20A to 20C of the case 10. In the figure, 37 and 38 are J / B12 and R / B1.
3 is a connecting means for electrically connecting the three. A pedestal portion 28D that supports 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 the upper bottom portion 11a.
And a peripheral wall portion 11b surrounding the lower end of the. A pair of pressing portions 4 are formed on the inner surface of the upper bottom 11a at intervals.
0A and 40B are projected. This pressing portion 40A, 4
OB is a tapered circular tube whose diameter gradually decreases from the upper bottom portion 11a side toward the tip surface 41, and the tip surface 41 is a flat surface. The positions where the pressing portions 40A and 40B are provided are such that when the upper cover 11 is covered on the case 10 as will be described later, the top surface 14e of the housing 14 of the J / B 12 is a flat portion where the connector portion 42 and the like are not provided. Are set to abut.

A groove 43 is formed on the entire inner circumference of the peripheral wall 11b.
And a packing member 44 is attached in the groove 43. The packing member 44 is made of rubber, foamed silicone,
It is made of an elastic material such as polyurethane foam. Further, the thickness t of the packing member 44 is the same as that of the upper cover 11 in the case 1
0 tightening means 50 to be described later by covering the upper opening 10a.
Thus, when the upper cover 11 is pressed against the case 10, the packing member 11 compressed by the upper end 10b of the case 10 does not lose elasticity.

A lock claw portion 45 is provided on the outside of the peripheral wall portion 11b. The lock claw portion 45 is used for the case 1
The upper cover 11 is locked to the case 10 by engaging with the inverted U-shaped lock arm portion 46 provided on the side wall 14 of No. 0. Further, on the side of the peripheral wall portion 11b opposite to the lock claw portion 45,
A buckle receiving recess 47 is provided. The side wall 14 opposed to the side wall 14a provided with the lock arm portion 46 of the case 10
An end portion of a buckle member 49 formed of a leaf spring having a bent portion 49a is rotatably supported on c. The buckle member 49 and the buckle receiving recess 47 constitute a tightening means 50, and the buckle member 49 is rotated with the upper cover 11 covering the upper opening 10a of the case 10 to rotate the bent portion 49a. When fitted into the buckle receiving recess 47, the lock claw 45 and the lock arm 46 are engaged with each other, and the upper cover 11 is pressed against the case 10b.

In the present embodiment, J / B 12 is used as case 1.
When fixing to 0, first, the lock portions 34A, 3
4B and the lock grooves 35A, 35B are engaged with each other, and the R / B
Attach 13 to J / B12. Next, the upper opening 10a
To J / B12 with R / B13 attached to case 10
To the inside, and the protrusions 20A to 2 corresponding to the inside of the guide recesses 17A and 17B of the lock portions 15A to 15C of the J / B 12.
The 0C head 22 is inserted. As the head 22 is inserted, the lock piece 16 that comes into contact with the head 22 elastically bends, and the lock protrusions 18 are fitted into the lock grooves 23A to 23C, and the lock portions 15A to 15C and the lock grooves 23A to 23C.
The C's are locked together and the J / B 12 is attached to the case 10.

Next, the upper cover 11 is attached to the case 1
The upper opening 10a of 0 is covered. In this state, the upper end 10b of the case 10 contacts the packing member 44, and the tip surfaces 41 of the pressing portions 40A and 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 indicated 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 and elastically compressed, and the upper cover 11 is displaced to the case 10 side. Since the upper cover 11 is pressed against the case 10 in this manner, the upper surface 14 of the housing 14 of the J / B 11 is
The pressing portions 40A and 40B that are in contact with e press the upper surface 14e of the housing 14 of the J / B 12 downward in the drawing.
Therefore, the end portions 25 of the guide recesses 17A, 17B are pressed against the tips of the head portions 22 of the protruding portions 20A to 20C, and the lower surface side of J / B12 is pressed against the end surface 29 of the pedestal portions 28A to 28B. Is firmly fixed to the case 10. Thus, in this embodiment, the packing member 4
The elastic deformation of 4 causes 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 are engaged with each other without any play.

In the fixing structure of this embodiment, J / B1
2 lock parts 15A to 15C to the case 23 lock 23
J / B12 case 10 just by engaging with A-23C
Since it can be fixed to, it is not necessary to use a tool such as impact, and installation work is easy. Further, as described above, the packing member 44 absorbs the clearance C, and J
Since / B12 does not rattle in case 10, it is possible to prevent generation of abnormal noise due to vibration, damage to the functions of components such as relays in J / B12, and occurrence of thermal problems at the contact portion.

Further, in the fixing structure of this embodiment, J / B
Lock portions 15A to 15 provided on the housing 14 of 12
C, the lock groove portions 23A to 23C provided on the case 10,
Pressing portions 40A and 40B provided on the upper cover 11
Are both J / B12 housing 14 and case 10.
Can be integrally molded at the time of resin molding, and the bolts 2A, 2B, nuts 4A, and nuts 4A, 2B in the conventional fixing structure shown in FIG.
Since no separate parts such as 4B are required, parts costs for such bolts and nuts and processing costs for projecting the bolts on the case 10 are unnecessary, and the manufacturing cost can be reduced.

Further, 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 like 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 the bus bar in the J / B 12 and the number of components mounted on the J / B.

The present invention is not limited to the above embodiment, but various modifications can be made. For example, in the above-described embodiment, the pressing portions 40A and 40B have a tapered circular tube shape, but the shape of the pressing portion is not limited to this, and the protruding portions J project from the upper bottom portion 11a of the upper cover.
If the shape is such that the housing 14 of / B12 can be pressed,
It may be a straight circular tube without a taper, a triangular tube, a rectangular tube, a polygonal tube, or a solid pillar such as a tapered pillar, a cylinder, a triangular pillar, a rectangular pillar, or a polygonal pillar. Further, 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.
A lock groove may be provided on the case 10 and a lock portion may be provided on the case 10. Further, the lock means 24 for locking the J / B 12 and the case 10 includes the lock portions 15A to 15C and the lock groove 23.
The locking means is not limited to A to 23C, and any structure can be used as long as the J / B 12 can be locked to the case 10. Furthermore, although the J / B 12 is fixed to the case 10 in the above-described embodiment, the fixing structure of the present invention is not limited to J / B, and various electric connection boxes such as R / B and FL / B can be used. Can be applied.

Furthermore, the tightening 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 the upper cover 11 is pressed against the upper opening 10a of the case 10. Anything can be used.

[0027]

As is apparent from the above description, in the structure for fixing the electric junction box according to the first aspect, the locking means is engaged, the upper cover is covered with the case, and the upper cover is covered with the fastening means. The electric connection box can be fixed to the case by pressing against, and it is not necessary to use a tool such as impact to fix the electric connection box, and the fixing work is easy.

In the fixing structure according to the first aspect of the present invention, the locking means can be formed integrally with the housing or case of the electric junction box, and the pressing 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,
The cost of parts for such bolts and nuts and the processing cost for fixing the bolts to the case are unnecessary, and the manufacturing cost can be reduced.

Further, when the fixing structure according to claim 1 is adopted, it is not necessary to provide the electric connection box with the mounting portion having the insertion hole unlike the conventional fixing structure, so that the circuit structure in the electric connection box can be improved. There are few restrictions on the degree of freedom and the number of parts that can be mounted in 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, rattling does not occur in the locking means, and abnormal noise is generated by vibration. And the function of parts of the electrical junction box is not impaired, and thermal problems do not occur at the contact parts.

When a packing member with which the upper end of the case abuts is attached to the inside of the peripheral wall portion of the upper cover as in claim 2, when the upper cover is pressed against the case by the tightening means, the packing member is attached. Is pressed by the upper end of the case and is elastically deformed, so that the clearance of the lock means is absorbed, rattling of the lock means is more reliably prevented, and the electric junction box can be firmly fixed to the case.

[Brief description of 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 an embodiment.

FIG. 3 is an exploded perspective view showing a locking means.

FIG. 4 is a partial sectional view showing a locking means.

FIG. 5 is a cross-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 Junction Box) 13 R / B 14 Housing 15A to 15C, 34A, 34B Locking Part 20A to 20C, 35A, 35B Projection Studs 23A to 23C, 36A, 36B Locking Groove 24 Tightening Attaching means 28A to 28D Pedestal portion 40A, 40B Holding portion 41 Tip surface 50 Locking means

Claims (2)

[Claims] 1. A fixing structure for fixing an electric junction box in a case, wherein a locking means for connecting a side surface of a housing of the electric junction box and a side wall of the case, and an upper opening of the case are closed. An upper cover, a tubular or solid columnar pressing portion projecting inside the upper cover, and a fastening means for pressing the upper cover to the case, and the tip end surface of the pressing portion is of the electrical junction box. A fixing structure for an electrical junction box, characterized by pressing the upper surface. 2. Inside the peripheral wall portion of the upper cover,
The fixing structure for an electrical junction box according to claim 1, further comprising a packing member attached to the upper end of the case.