JPH11262136A - Fastening structure for bus bar of electric joint box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of abnormal noise caused by vibrations of bus bars, in an electric joint box with the bus bars provided in its upper and lower cases. SOLUTION: Fastening structures of bus bars are constituted of respectively of pressing members 3, 4 on a reinforcing rib formed in a lower case 52 and on a reinforcing rib 59 formed in an upper case 58. Bus bars 56, 55 and an insulation plate are pressed by these pressing members 3, 4 and backlash is eliminated between the reinforcing ribs and vibrations of the bus bars 56, 55 are made impossible to prevent the abnormal noise caused by vibrations. The ends of the pressing members 3, 4, are made crushed in shape and vibration of the bus bars 56, 55 can be surely prevented, in conjunct with the elasticity of the upper and lower cases 52, 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connection box for connecting various electronic devices and wire harnesses, and more particularly to a bus bar fixing structure for preventing vibration of a bus bar disposed in the electric connection box.

[0002]

2. Description of the Related Art At present, automobiles are equipped with various electronic devices, and an electric connection box having a bus bar is used for connecting electronic devices and a wire harness. The configuration of the electric junction box has various parts configurations and shapes depending on the specifications of the automobile, the space to be assembled, and the like, and an example thereof will be described below with reference to FIGS. FIG. 5 is a perspective view of a main part showing a configuration of a lower case constituting the electric connection box, and FIG. 6 is a sectional view showing a main part structure of the electric connection box.

[0003] An example of the structure of a lower case 52 constituting an electric junction box 51 will be described. As shown in FIG. 5, an electric component such as a connector 53 is provided inside a lower case, and a reinforcing rib 54 is provided around a lattice. It is integrally molded in a shape. The electric connection box 51 is provided on the reinforcing rib 54 as shown in FIG.
7, a laminated body in which bus bars 55 and 56 are embedded is provided, and the entire lower case 52 is covered by an upper case 58. Since the reinforcing ribs 59 are also integrally formed on the upper case 58, the bus bars 55, 56 as shown in FIG.
The insulating plate 57 is located between the reinforcing ribs 54 and 59.

The electric connection box 51 includes reinforcing ribs 54, 5
The bus bars 55 and 56 are assembled between nine. Therefore, the reference surface of the lower case 52 (in the illustrated example, the reinforcing rib 54
The distance between the upper surface of the upper case 58 and the reference surface of the upper case 58 (the lower surface of the reinforcing rib 59 in the illustrated example) is A, and the bus bars 55 and 56
If the thickness of the insulating plate 57 in which is embedded is B, it is necessary to set A> B. However, when A> B, a gap C is formed between the two in accordance with the thickness B, and the following problem has occurred due to the gap C.

[0005]

The driving environment of an automobile varies widely, and the vibration of the automobile changes variously according to the driving situation. And the electric connection box 5
1 is vibrated, and if there is the gap C, the bus bar 5
5, 56 and the insulating plate 57 vibrate integrally, and the reinforcing ribs 5
Abnormal noise was generated at 4,59. Such abnormal noise is very worrisome and undesired because it gives a sense of anxiety to the driver. Further, in severe cases, there is a possibility that the electrical junction box may be damaged or a connection failure may occur due to the impact due to the vibration.

The bus bar and the electric connection box provided with the bus bar are described in (1) "Electrical connection box" disclosed in Japanese Utility Model Application Laid-Open No. 2-83620, and (2)
JP-A-53549 discloses an "assembly structure of a laminated bus bar wiring board", and (3) JP-A-8-322127 discloses a "laminated structure of a bus bar and an insulating plate housed in an electric junction box". .

(1) A structure in which a bus bar is buried in a storage recess formed in an insulating plate and a boss formed in the insulating plate is deformed to press the bus bar, and another insulating plate is applied to the insulating plate. Are also disclosed. But,
Although the bus bar can be fixed to the insulating plate, there is no structure for holding the insulating plate, and the vibration between the bus bar and the case is not suppressed as described above. (2) Another wiring board in which convex portions on both sides of an arrangement path are stacked when a plurality of wiring boards each having bus bars arranged in a concave arrangement path formed on an insulating substrate are stacked. And a bus bar is pressed by the laminated wiring boards. However, the original purpose of this configuration is to prevent leakage of current between the bus bars and to improve heat dissipation. It does not improve fixation. (3) is a configuration in which the bus bars are arranged on the arrangement path formed on the insulating plate and the stacked bus bars are pressed by the protruding portions that protrude both ends of the arrangement path of the bus bar. The original purpose of this configuration is to reduce the number of insulating plates and reduce the cost, and does not improve the fixation of the bus bars and the insulating plates.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to prevent vibration of a bus bar disposed in an upper and lower case and an insulating plate in which the bus bar is buried, thereby preventing generation of abnormal noise due to the vibration. It is an object of the present invention to provide a bus bar fixing structure of an electric junction box configured to prevent such a problem.

[0009]

The object according to the present invention is achieved by the following constitution. A laminate formed by embedding bus bars in an insulating plate is sandwiched between a reference surface of a lower case on which desired electric components and reinforcing ribs are formed and a reference surface of an upper case on which desired electric components and reinforcing ribs are formed. In the bus bar fixing structure of the electric connection box arranged as described above, a pressing member for pressing the bus bar is provided on the reference surface of the upper and lower cases at a position facing the bus bar embedded in the insulating plate. A bus bar fixing structure for an electric junction box.

The distance D between the pressing members is set to be B> D with respect to the thickness B of the laminated body, and the end is crushed by pressing the bus bar. A bus bar fixing structure for an electric junction box as described above. The busbar fixing structure for an electric connection box according to the above or the above, wherein the reference surface is an end surface of the reinforcing rib, and the pressing member is provided on the reinforcing rib. The busbar fixing structure for an electric connection box according to any one of the above-mentioned items, wherein the pressing member has a conical shape. The bus bar fixing structure for an electric connection box according to any one of the above-mentioned items, wherein the pressing member is formed integrally with the upper and lower cases. The busbar fixing structure for an electric junction box according to any one of the above-mentioned items, wherein the pressing member is formed separately from the upper and lower cases and is fixed to the reference surface.

In the busbar fixing structure of the electric junction box described above, since the pressing members are formed on the reference surfaces of the upper and lower cases, the busbars and the insulating plates disposed between the reference surfaces can be pressed by the pressing members. . Note that the reference surfaces in the present invention are the opposing surfaces of the upper and lower cases that define a space in which a laminate formed by embedding bus bars in an insulating plate is loaded.

In the busbar fixing structure of the electric connection box described above, the interval D between the pressing members is set to be smaller than the thickness B of the busbar, so that the elasticity of the upper and lower cases is utilized in accordance with the difference of BD. To press the bus bar.
In the busbar fixing structure of the electric connection box described above, since the pressing member is provided on the reinforcing rib, the pressing member can be formed by a slight processing of the mold when integrally molded with the upper and lower cases. In the busbar fixing structure of the electric junction box described above, since the reinforcing rib has a conical shape, the tip portion can be easily crushed when the busbar is pressed. Since the bus bar fixing structure of the electric connection box described above is integrally formed with the upper and lower cases, the pressing member can be formed by a slight processing of the mold. In the busbar fixing structure of the electric junction box described above, since the reinforcing rib is separate, the conventional electric junction box can be used as it is.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a bus bar fixing structure for an electric connection box according to the present invention will be described with reference to FIGS. 1 is a perspective view of a lower case showing a shape of a pressing member, FIG. 2 is a cross-sectional view of a main part showing a relation between an overlapping state of upper and lower cases and a bus bar fixing structure, and FIG. 3 shows a bus bar fixing structure of an electric connection box. FIG. 4 is an enlarged perspective view of the main part showing the crushed shape of the pressing member after the bus bar is fixed. In the description of the present embodiment, the drawings and reference numerals referred to in the description of the conventional example are appropriately used.

The electric connection box 1 according to the present embodiment is shown in FIG.
As shown in FIG. 7, a laminated body in which bus bars 55 and 56 are embedded in an insulating plate 57 is disposed between a lower case 52 and an upper case 58. And
The busbar fixing structure 2 includes a lower case 52 as shown in FIG.
The pressing member 3 formed on the reinforcing rib 54 of the upper case 58 and the pressing member 4 formed on the reinforcing rib 59 of the upper case 58 as shown in FIG.
It is composed of The bus bar fixing structure 2 is provided to prevent the bus bars 55 and 56 and the insulating plate 57 from vibrating. According to this configuration, the upper and lower cases 52,
The bus bars 55, 5
6, the pressing members 3 and 4 abut against the bus bars 55 and
6 and the insulating plate 57 are integrated and pressed from above and below.

The pressing members 3 and 4 may have the same shape, and in this embodiment are formed in a conical shape as shown in FIG.
The formation positions of the pressing members 3 and 4 are freely changed in accordance with the arrangement positions of the bus bars 55 and 56. In the present embodiment, the pressing members 3 and 4 are formed integrally with the upper and lower cases 52 and 58 on the surfaces of the reinforcing ribs 54 and 59. Have been.

In the electric junction box 1, the upper case 52
Is the same as the conventional example, and the thickness B of the laminate formed by embedding the bus bars 55 and 56 in the insulating plate 57 is the same as the conventional example. However, if the pressing members 3 and 4 are provided so that the distance between them is D as shown in FIG. 2, the relationship with B becomes B> D. Therefore, as shown in FIG.
The tips of the pressing members 3 and 4 abut against the bus bars 55 and 56.
And the insulating plate 57 are pressed from above and below.

The edge 52A of the lower case 52 is formed in a hook shape in cross section, and the upper surface thereof is formed in a tapered surface. On the other hand, the edge 58A of the upper case 58 is also formed in a hook shape, and the edge 52A is formed so as to lock the edge 58A when the upper and lower cases 52, 58 are put together.
Therefore, in a state where the upper and lower cases 52 and 58 are put together and locked as shown in FIG. 2, the upper and lower cases 52 and 58 do not come off even if the relation of B> D as described above. Then, the bus bars 55 and 56 are pressed down by the elasticity of the upper and lower cases 52 and 58. At this time, since the tips of the pressing members 3 and 4 are crushed as shown in FIG. 4 in accordance with the dimensional difference of B> D, the upper and lower cases 52 and 58 do not expand, and the upper and lower cases 52 and 58 do not swell. Busbar 5 by elasticity
5, 56 and the insulating plate 57 are pressed together. As a result, the bus bars 55 and 56 and the insulating plate 57 do not vibrate, and the generation of abnormal noise can be prevented even while the vehicle is running.

The pressing members 3 and 4 include upper and lower cases 52,
The upper and lower cases 5
Since it can be formed integrally with the members 2 and 58, the cost does not increase. Further, there is no need to change the assembling process of the electrical junction box 1, and the electrical junction box 1 free of abnormal noise can be obtained without using a special jig. And
Since the elastic force of the upper and lower cases 52 and 58 is used, the fixing work is simple and the workability is good.

Although the embodiment of the present invention has been described above, the present invention is not limited to the embodiment. For example, the shape of the pressing member may be a disk-shaped base formed with a columnar body that is easily crushed, or may be a brushed shape that deforms at all at random. Further, the pressing member may be formed separately and fixed to a reference surface such as a reinforcing rib. In this case, the conventional upper and lower cases can be used as they are. Further, it is preferable that the pressing member is formed of an elastically deformable material such as rubber because the pressing member itself generates a pressing force. In addition, a plurality of laminated bodies each including a bus bar embedded in an insulating plate may be laminated.

[0020]

As described above, the bus bar fixing structure of the electric connection box according to the present invention has the bus bar on the reference surface of the upper and lower cases which defines the space for loading the laminate formed by embedding the bus bar in the insulating plate. Since the pressing member for pressing is provided, rattling of the stacked body is prevented, and occurrence of vibration and abnormal noise can be prevented. For example, a pressing member is formed on the reinforcing ribs of the upper and lower cases, and a bus bar or an insulating plate disposed between the reinforcing ribs is sandwiched and pressed by the pressing member, so that the pressing member is easily integrally formed. be able to. Further, by setting the interval between the pressing members to be smaller than the thickness of the laminate, the bus bar or the insulating plate is pressed by the pressing force according to the dimensional difference between them and the pressing force using the elasticity of the upper and lower cases. be able to. Therefore, the pressing of the bus bar or the like is further strengthened, and the generation of vibration and abnormal noise can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a partially enlarged perspective view of a lower case showing a main part configuration of a bus bar fixing structure according to the present invention.

FIG. 2 is a sectional view of a main part showing a configuration of a hull bar fixing structure.

FIG. 3 is a cross-sectional view showing a configuration of an electric connection box and a bus bar fixing structure.

FIG. 4 is a perspective view showing a crushed shape of a pressing member.

FIG. 5 is a perspective view of a lower case showing a configuration of a conventional electric junction box.

FIG. 6 is a sectional view showing a configuration of a conventional electric junction box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric connection box 2 Busbar fixing structure 3,4 Pressing member 52 Lower case 54,59 Reinforcement rib 55,56 Busbar 57 Insulating plate 58 Upper case A, D interval B Thickness of busbar

Claims (6)

[Claims] A busbar is buried in an insulating plate between a reference surface of a lower case on which desired electric components and reinforcing ribs are formed and a reference surface of an upper case on which desired electric components and reinforcing ribs are formed. In the bus bar fixing structure of the electric connection box disposed so as to sandwich the laminated body, the bus bar is pressed to a position on at least one of the reference surfaces of the upper and lower cases facing the bus bar embedded in the insulating plate. A bus bar fixing structure for an electric connection box, wherein a pressing member is provided. 2. The method according to claim 1, wherein the distance D between the pressing members is set to be B> D with respect to the thickness B of the laminate, and the pressing member is formed in such a shape that its tip is crushed by pressing the bus bar. The busbar fixing structure for an electric junction box according to claim 1, wherein: 3. The bus bar fixing structure according to claim 2, wherein the reference surface is an end surface of the reinforcing rib, and the pressing member is provided on the reinforcing rib. 4. The busbar fixing structure according to claim 1, wherein the pressing member has a conical shape. 5. The busbar fixing structure according to claim 1, wherein the pressing member is formed integrally with the upper and lower cases. 6. The bus bar fixing structure according to claim 1, wherein the pressing member is formed separately from the upper and lower cases and is fixed to the reference surface.