JP2009165220A - Electric connection box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric connection box which can prevent a short circuit of a bus bar without enlarging the height dimension of the electric connection box, and can maintain favorable assembling workability and quality. <P>SOLUTION: In a box body 2 of the electric connection box 1, the depth of a bus-bar accommodation groove 9 formed at an accommodation wall 8 for accommodating the bus bar 4 is set to be smaller than the vertical dimension of the bus bar 4, and covers 10, 11 for covering ends are formed at the ends of the bus bar 4 protruding from the bus-bar accommodation groove 9 by the set dimension. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrical junction box mounted on an automobile or the like.

For example, an electric junction box for an automobile is a well-known device that controls power supply to each terminal device by connecting / disconnecting the power source of the on-vehicle battery and the terminal device such as an audio or air conditioner serving as an electric load. is there. FIG. 4 is an exploded perspective view showing an example of the electrical connection box 20, in order to attach a wire harness connector for connecting the terminal device, a fuse for protecting an electrical circuit of the internal wiring body, etc. to the upper surface of the box body 21. . Are formed, and a bus bar 23 for distributing the power supplied from the battery to the internal wiring body is provided in the approximate center of the box body 21. The bus bar 23 is formed by bending a copper plate into a rectangular tube shape in a plan view, and an accommodating wall 24 along the shape of the bus bar 23 is erected substantially at the center of the box body 21. A bus bar housing groove 25 into which the bus bar 23 is inserted and housed vertically is formed along the center line. As shown in FIG. 5, the bus bar receiving groove 25 is formed deeper than the vertical dimension of the bus bar 23 in order to prevent a short circuit of the bus bar 23. It is buried in the housing wall 24 so as not to be exposed.
An electric junction box employing such a vertically accommodated bus bar is also disclosed in Patent Document 1.

JP-A-9-283004

The capacity of the bus bar, that is, the dimension in the height direction is determined from the energization current value and the heat radiation area. Therefore, if the energization current value is large, the cross-sectional area of the bus bar is increased, but if the plate thickness is increased, bending work becomes difficult, and thus the height dimension is often increased while the plate is thin. In this case, there is an advantage that heat dissipation efficiency is improved.
However, when the height dimension of the bus bar is increased, the bus bar receiving groove is also deepened to prevent a short circuit, and the height dimension of the electrical junction box is also increased. As shown in FIG. 6, generally, the terminal insertion portion such as the housing portion 22 is lower than the housing wall 24 that houses the bus bar 23, and the height dimension of the electrical junction box depends on the size of the bus bar housing portion such as the housing wall 24. It is because it is decided.
For this reason, the cost related to the electrical junction box (mold cost and molding processing cost) becomes high, and the housing part of the bus bar molded with a thin and high wall protrudes, so that warpage is likely to occur and the bus bar is inserted. As a result, it is difficult to perform assembly, and the assembly workability is deteriorated. Further, the bus bar is inclined, and it is impossible to insert the bus bar to an accurate depth, so that the quality may be deteriorated.

  Accordingly, an object of the present invention is to provide an electrical junction box that can prevent a short circuit of a bus bar and maintain good assembly workability and quality without increasing the height dimension of the electrical junction box. .

In order to achieve the above object, the invention according to claim 1 makes the depth of the bus bar receiving groove smaller than the vertical dimension of the bus bar, and at the end of the bus bar protruding from the bus bar receiving groove by the dimension setting, A cover for covering the end portion is provided.
According to a second aspect of the present invention, in the configuration of the first aspect, the cover has a groove into which the end of the bus bar can be inserted in order to easily attach the cover to the end of the bus bar. Is configured to be fitted to the end of the bus bar by being fitted to the end of the bus bar.
According to a third aspect of the present invention, in the configuration of the first aspect, the cover is integrated with the end portion of the bus bar by an insert mold in order to eliminate the trouble of mounting the cover and facilitate the insertion work of the bus bar. It is characterized by that.
According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, in order to easily provide a cover for a plurality of bus bars, a plurality of bus bars are provided, and a cover corresponding to the plurality of bus bars is provided. It is characterized by being formed integrally.

According to the first aspect of the present invention, it is not necessary to match the height of the box body to the bus bar, and the height dimension of the electrical connection box including the bus bar housing portion can be made compact. Therefore, the cost can be reduced. Further, since the bus bar housing groove does not become deep, warpage is unlikely to occur, and the bus bar can be easily inserted to an appropriate position, and good assembly workability and quality can be maintained. Of course, since the protruding portion of the bus bar is protected by the cover, it is possible to prevent a short circuit of the bus bar, and further, it is possible to prevent damage to the electric wire coating due to the electric wire contacting the edge of the bus bar.
According to the second aspect of the invention, in addition to the effect of the first aspect, the cover can be easily attached to the end portion of the bus bar by the groove.
According to the third aspect of the invention, in addition to the effect of the first aspect, there is no need to insert the cover with the insert mold, and the rigidity of the grip portion (cover portion) when the bus bar is inserted into the bus bar receiving groove is increased. In addition to being secured, it is easier to hold and the insertion work becomes easier.
According to the fourth aspect of the present invention, in addition to the effect of any one of the first to third aspects, the cover can be easily provided even if there are a plurality of bus bars.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an example of an electrical junction box. The electrical junction box 1 is an interior (not shown) in which electrical components such as a relay are mounted inside a box body 2 of a synthetic resin molded product having a rectangular shape in plan view. The housing body 3, 3... For housing the wiring body and mounting the connector of the wire harness for connecting the terminal device, the fuse for protecting the electric circuit of the internal wiring body, etc. on the upper surface of the box body 2 Is formed.
A bus bar 4 that distributes the power supplied from a battery or the like to the internal wiring body is provided in the approximate center of the box body 2. The bus bar 4 is formed by bending a copper plate into a rectangular cylinder in plan view, and has a substantially L shape in plan view that forms side surfaces in the cylindrical longitudinal direction and the short side direction in accordance with the distribution mode of the power source. The first distribution part 5 having the terminal 6 for power supply at the end in the longitudinal direction, and the second distribution in the L-shape or Z-shape in plan view formed along the other longitudinal direction of the tube It has parts 7, 7,.

The bus bar 4 is accommodated in an accommodating wall 8 that is erected along the shape of the bus bar 4 at the approximate center of the box body 2. The housing wall 8 is formed with bus bar housing grooves 9, 9,... In which the first distribution section 5 and the second distribution section 7 of the bus bar 4 are inserted and housed vertically along the center line. The depth of the bus bar receiving groove 9 is set to be smaller than the height of the bus bar 4, and when the bus bar 4 is housed, the upper ends of the distributing portions 5, 7 are more than the housing wall 8 as shown in FIG. It protrudes upward.
Reference numerals 10 and 11 denote resin-molded product covers that are mounted on the ends of the bus bars 4 that protrude upward from the housing wall 8. First, the cover 10 is formed in a substantially L shape in plan view corresponding to the first distribution portion 5. The cover 11 is formed in an L shape or a Z shape in plan view corresponding to the second distribution portion 7. Further, as shown in FIG. 2, the covers 10 and 11 are fitted with the upper ends of the respective distribution portions having grooves 12 that can be inserted over the entire length thereof. The lower surfaces of the covers 10 and 11 are in contact with the upper surface of the housing wall 8 so as to completely cover the protruding portion of the bus bar 4.

  In the electrical junction box 1 configured as described above, when the bus bar 4 is inserted into the bus bar housing grooves 9, 9,... By setting the dimensions with the groove 9, the bus bar 4 is accommodated in the bus bar accommodating groove 9 with the upper ends of the distributing portions 5, 7 protruding upward from the accommodating groove 8. In this state, when the covers 10 and 11 are respectively placed on the upper ends of the distribution portions 5 and 7, the protruding portions of the bus bar 4 are covered and protected by the covers 10 and 11 as shown in FIG. .

Thus, according to the electrical junction box 1 of the said form, the depth of the bus-bar accommodation groove 9 is made smaller than the vertical dimension of the bus-bar 4, and the edge part of the bus-bar 4 which protrudes from the bus-bar accommodation groove 9 by the dimension setting In addition, by providing the covers 10 and 11 covering the end portions, it is not necessary to adjust the height of the box body 2 to the bus bar 4, and the height dimension of the electrical connection box 1 including the housing wall 8 can be made compact. . Therefore, it can be formed at low cost. Further, since the bus bar housing groove 9 does not become deep, warpage is unlikely to occur, and the bus bar 4 can be easily inserted to an appropriate position, and good assembly workability and quality can be maintained. Of course, since the protruding portion of the bus bar 4 is protected by the covers 10 and 11, it is possible to prevent the bus bar 4 from being short-circuited, and it is possible to prevent the wire covering from being damaged by the contact of the electric wire with the edge of the bus bar 4.
Further, here, the covers 10 and 11 have a groove 12 into which the end of the bus bar 4 can be inserted, and are fitted to the end of the bus bar 4 by fitting the groove 12 to the end of the bus bar 4. Therefore, the covers 10 and 11 can be easily attached to the end of the bus bar 4.

  In the above embodiment, the cover provided with the groove is formed separately and fitted to the upper end of the bus bar. However, the bus bar may be set in advance in the cover mold and integrally formed. If the cover is integrated with the end of the bus bar by insert molding in this way, there is no need to attach the cover, and the rigidity of the grip portion (cover portion) when the bus bar is inserted into the bus bar receiving groove is secured. It becomes easier to hold and the insertion work becomes easier.

Moreover, in the said form, although the several cover is formed independently for every distribution part, the cover corresponding to a some distribution part may be integrally formed continuously. In this way, the cover can be easily provided even if there are a plurality of bus bars.
Furthermore, the cover need not be formed in accordance with the bent shape of the bus bar, and a form in which a groove corresponding to the bent shape of the bus bar is provided in the lower surface of the plate-like cover is also conceivable.
In addition, the specific shape of the box body and the bent shape of the bus bar are not limited to the above forms, and the present invention can be adopted even in a type in which a terminal portion such as a fuse is formed on the lower end side of the bus bar.

It is a disassembled perspective view of an electrical junction box. It is sectional drawing which shows the accommodation state of the bus bar to a bus-bar accommodation groove | channel. It is a perspective view of an electrical junction box. It is a disassembled perspective view of the conventional electrical junction box. In the conventional electrical junction box, it is sectional drawing which shows the accommodation state of the bus bar to a bus-bar accommodation groove | channel. It is a perspective view of the conventional electrical junction box.

Explanation of symbols

  1 .... Electric junction box 2 .... Box body 4 .... Bus bar 5 .... First distribution part 7 .... Second distribution part 8 .... Accommodation wall 9 ... Bus bar accommodation groove 10,11・ ・ Cover, 12 ・ ・ Groove.

Claims (4)

An electrical connection box comprising a bus bar bent into a predetermined shape in a box body, and a bus bar housing groove for inserting and housing the bus bar vertically,
The depth of the bus bar receiving groove is smaller than the vertical dimension of the bus bar, and a cover for covering the end is provided at the end of the bus bar protruding from the bus bar receiving groove according to the dimension setting. Electrical junction box.   2. The cover according to claim 1, wherein the cover has a groove into which an end of the bus bar can be inserted, and the cover is attached to the end by fitting the groove into the end of the bus bar. Electrical junction box.   The electrical connection box according to claim 1, wherein the cover is integrated with an end portion of the bus bar by an insert mold.   The electrical junction box according to any one of claims 1 to 3, wherein a plurality of the bus bars are provided, and a cover corresponding to the plurality of bus bars is integrally formed.

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