JP2016092926A - Electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box capable of having an electronic circuit board easily separated from a box body with a soldering part left on the electronic circuit board.SOLUTION: An electric connection box 100 comprises an electronic circuit board 150 having an electric circuit formed, a box body 10 mounted with the electronic circuit board 150, and a cover body 20 covering the box body 10 and electronic circuit board 150. The box body 10 has a base part 12 in which an electric component is housed, outer walls 14A-14D and inner wall 16A-16D extending upward from the base part 12 at a peripheral edge of the box body 10, and a solder connection terminal 15 for electrically connecting the electric component in the base part 12 and the electric circuit of the electronic circuit board 150 to each other by soldering. The solder connection terminal 15 is provided nearby the outer wall 14B and inner wall 16B.SELECTED DRAWING: Figure 2

Description

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

  In general, an electrical connection box mounted on an automobile or the like includes a box body containing electrical components such as relays, fuses, and terminals therein, an electronic circuit board such as an electronic control unit (ECU) mounted on the box body, The cover body which covers a box main body is included (for example, refer patent document 1). When any trouble occurs in such an electrical junction box, it is necessary to specify whether the trouble is caused by the electronic circuit board or the box main body (an electrical component thereof).

  In order to identify the location where the problem has occurred in this way, it is necessary to separate the electronic circuit board from the box body and to inspect the box body and the electronic circuit board for the presence or absence of the problem. At this time, the electric circuit of the electronic circuit board and the terminal of the box body are joined by soldering, but there may be a defect in this soldering part. It is necessary to separate the electronic circuit board from the box body while leaving it in the box.

  The conventional electric junction box is not designed in consideration of the workability and troubles when separating the electronic circuit board, and it takes time to separate the electronic circuit board from the box body. When doing so, the circuit pattern of the electronic circuit board may be destroyed, and it may be difficult to identify the location where the problem has occurred.

JP 2004-96899 A

  The present invention has been made in view of such problems of the prior art, and an electrical junction box that can easily separate an electronic circuit board from a box body while leaving a soldered portion on the electronic circuit board. The purpose is to provide.

  According to the first aspect of the present invention, there is provided an electrical junction box capable of easily separating the electronic circuit board from the box body while leaving the soldered portion on the electronic circuit board. The electrical connection box includes an electronic circuit board on which an electric circuit is formed, a box body on which the electronic circuit board is mounted, and a cover body that covers the box body and the electronic circuit board. The box body includes a base portion that accommodates electrical components therein, a wall that extends upward from the base portion at the periphery of the box body, and the electrical components in the base portion and the electrical circuit of the electronic circuit board by soldering. And a solder connection terminal for electrical connection. The solder connection terminal is provided in the vicinity of the wall.

  It is preferable that the box body further includes a terminal access portion that makes it easy to access the solder connection terminal between the electronic circuit board and the base portion from the outside. The terminal access part may be constituted by a thin part having a thin wall. In this case, it is preferable that a guide groove into which the side wall of the cover body is inserted is formed inside the thin portion of the wall. Moreover, you may comprise the said terminal access part by the slit formed in the said wall. In this case, it is preferable that a guide groove into which the side wall of the cover body is inserted is formed inside the slit of the wall.

  The cover body may include at least one engaging portion formed on each of at least one pair of opposing side walls of the side walls, and the box body corresponds to the engaging portion of the cover body. Thus, the engaged portion formed on the wall may be provided so that the engaged portion of the cover body guided by the guide groove can be engaged.

  It is preferable that the terminal access portion has a width larger than a length in a direction along the wall of a region where the solder connection terminal is provided.

  According to the present invention, by disposing the solder connection terminal in the vicinity of the wall at the peripheral edge of the box body, the wall when separating the electronic circuit board and the box body in order to identify the location where the defect has occurred. It is possible to access the solder connection terminal only by forming an opening in a part thereof, and it is possible to cut the solder connection terminal extending between the electronic circuit board and the base through the opening. Therefore, it becomes easy to separate the electronic circuit board from the box body while leaving the soldered portion on the electronic circuit board.

It is a top view which shows the electrical junction box in one Embodiment of this invention. It is a disassembled perspective view of the electrical junction box of FIG. It is a top view which shows the cover body of the electrical-connection box of FIG. It is a front view of the cover body of FIG. It is a figure which shows typically the relationship between the cover body of FIG. 1, and a box main body, and has shown the state which attached the cover body to the box main body before mounting an electronic circuit board. It is a figure which shows typically the relationship between the cover body of FIG. 1, and a box main body, and has shown the state when removing a cover body from a box main body before an electronic circuit board is mounted. It is a schematic diagram which expands and shows the vicinity of the solder connection terminal of the electrical-connection box of FIG. It is a schematic diagram which expands and shows the vicinity of the solder connection terminal in other embodiment of this invention. It is a schematic diagram which expands and shows the vicinity of the solder connection terminal in further another embodiment of this invention.

  Hereinafter, embodiments of an electrical junction box according to the present invention will be described in detail with reference to FIGS. 1 to 9. In FIG. 1 to FIG. 9, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a plan view showing an electrical junction box 100 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the electrical junction box 100. As shown in FIG. 2, the electrical junction box 100 in the present embodiment accommodates therein an electronic circuit board 150 constituting an electronic control unit (ECU) such as an automobile. That is, the electrical junction box 100 enables electrical connection between the electronic circuit board 150 and the external device. As shown in FIGS. 1 and 2, the electrical junction box 100 includes a substantially rectangular parallelepiped box body 10 on which an electronic circuit board 150 is mounted, and a cover body 20 that covers the box body 10. The box body 10 and the cover body 20 are made of a resin such as polyamide (PA) or polyphthalamide (PPA).

  FIG. 3 is a plan view showing the cover body 20, and FIG. 4 is a front view. As shown in FIGS. 3 and 4, the cover body 20 includes a substantially rectangular upper wall 22 and side walls 24 </ b> A to 24 </ b> D extending downward from the periphery of the upper wall 22. The upper wall 22 and the side walls 24A to 24D are integrally formed of resin, and the side walls 24A to 24D are formed thin enough to have flexibility.

  The upper wall 22 has a connector opening 23 corresponding to the shape of the connector 152 (see FIG. 2) provided on the electronic circuit board 150. When the electronic circuit board 150 is accommodated in the electrical connection box 100, The connector 152 of the electronic circuit board 150 is exposed from the connector opening 23 of the cover body 20 (see FIG. 1).

  As shown in FIGS. 3 and 4, a pair of opposing side walls 24 </ b> A and 24 </ b> C among the side walls 24 </ b> A to 24 </ b> B of the cover body 20 is formed with a claw portion 26 as an engaging portion protruding outward. Yes. In the example shown in FIG. 3, three claw portions 26 are formed at positions spaced apart from each other on the side wall 24 </ b> A, and two claw portions 26 are formed at positions spaced apart from each other on the side wall 24 </ b> C.

  Returning to FIG. 2, the box body 10 includes a substantially rectangular parallelepiped base 12 in which electrical components such as relays, fuses, and terminals are accommodated, and outer walls 14 </ b> A to 14 </ b> D extending upward from the peripheral edge of the base 12. Inner side walls 16A to 16D extending upward from the base 12 at positions inside the outer side walls 14A to 14D (in FIG. 2, the inner side wall 16A facing the outer side wall 14A and the inner side wall 16D facing the outer side wall 14D are shown. And a positioning rod 17 for positioning the cover body 20 and the electronic circuit board 150 with respect to the box body 10. Guide grooves 18 for guiding the side walls 24A to 24D of the cover body 20 are formed between the inner peripheral surfaces of the outer side walls 14A to 14D and the outer peripheral surfaces of the inner side walls 16A to 16D.

  Near the inner wall 16B and the outer wall 14B of the base portion 12, a plurality of pin-shaped solder connection terminals 15 extending upward are provided. These solder connection terminals 15 are electrically connected to electrical components inside the base 12. Corresponding to the solder connection terminals 15, a plurality of connection holes 156 are formed in the electronic circuit board 150. The solder connection terminal 15 of the box body 10 is inserted into the connection hole 156 of the electronic circuit board 150 and the tip portion is soldered to the electronic circuit board 150, whereby the electric components inside the base 12 and the electric circuit of the electronic circuit board 150 are Are electrically connected.

  As shown in FIG. 2, in the present embodiment, two positioning rods 17 extend upward from the base portion 12. A positioning hole 154 (only one is shown in FIG. 1) is formed in the electronic circuit board 150 at a position corresponding to the positioning rod 17. By inserting the two positioning rods 17 into the positioning hole 154 of the electronic circuit board 150, the electronic circuit board 150 can be mounted in a state of being positioned with respect to the box body 10. In this positioned state, the solder connection terminal 15 of the base 12 described above is inserted into the connection hole 156 of the electronic circuit board 150 and soldered to the electronic circuit board 150.

  Further, a screw mounting hole 25 is formed in the upper wall 22 of the cover body 20 at a position corresponding to the position of the positioning rod 17. After the cover body 20 is attached to the box body 10 at the final stage of assembly, the cover body 20 is screwed into a screw hole (not shown) formed at the upper end of the positioning rod 17 from above the cover body 20. Can be fixed to the box body 10. In FIG. 2, the electronic circuit board 150 and the cover body 20 are not attached to the box body 10, and the screw 30 is shown screwed to the upper end of the positioning rod 17. After the electronic circuit board 150 and the cover body 20 are attached, the screw 30 is screwed from the upper part of the cover body 20.

  As shown in FIG. 2, the outer walls 14A and 14C corresponding to the side walls 24A and 24C of the cover body 20 on which the claw portion 26 is formed have engagement holes as engaged portions at positions corresponding to the claw portions 26. 19 is formed. When the side walls 24A to 24D of the cover body 20 are inserted into the guide groove 18 and pushed down, the side walls 24A and 24C are bent slightly inward by the claw portion 26 coming into contact with the outer walls 14A and 14C. The claw portion 26 is fitted into and engaged with the engagement hole 19 formed in the outer walls 14A and 14C. The state at this time is schematically shown in FIG. As shown in FIG. 5, since the claw portion 26 is engaged with the engagement holes 19 of the outer walls 14A and 14C, even if the cover body 20 is to be removed from the box body 10, it cannot be removed as it is. ing.

  However, since the side walls 24A and 24C of the cover body 20 have flexibility as described above, for example, as shown in FIG. 6, when the upper portion of the side wall 24C is pushed inwardly, the side wall 24C bends inward, and the box The inner wall 16C of the main body 10 is also bent slightly by being pushed by the side wall 24C. As a result, the claw portion 26 of the cover body 20 is detached from the engagement hole 19, and the cover body 20 can be removed from the box body 10.

  FIG. 7 is an enlarged schematic view showing the vicinity of the solder connection terminal 15 of FIG. As shown in FIG. 7, the plurality of solder connection terminals 15 are arranged in the vicinity along the inner wall 16B and the outer wall 14B. Thus, by arranging the solder connection terminal 15 in the vicinity of the inner side wall 16B and the outer side wall 14B, when the electronic circuit board 150 and the box body 10 are separated in order to identify the location where the problem has occurred, the inner side The solder connection terminal 15 can be accessed simply by forming an opening in a part of the wall 16B and the outer wall 14B, and the solder connection terminal 15 extending between the electronic circuit board 150 and the base portion 12 is cut through the opening. It becomes possible to do. Therefore, it becomes easy to separate the electronic circuit board 150 from the box body 10 while leaving the soldered portion on the electronic circuit board 150.

  Here, as shown in FIG. 7, a terminal access portion 40 that makes it easy to access the solder connection terminal 15 extending between the electronic circuit board 150 and the base portion 12 from the outside may be provided. In the example shown in FIG. 7, a pair of grooves 11, 11 extending in the vertical direction are formed in the outer wall 14 </ b> B, and the portions of the grooves 11, 11 are made thinner than the other parts, so Forming. Similarly, a pair of grooves 13 and 13 extending in the vertical direction are formed in the inner wall 16B, and the thin portions 44 and 44 are formed by making the grooves 13 and 13 thinner than the other parts. . These thin portions 42 and 42 and the thin portions 44 and 44 constitute a terminal access portion 40.

  Thus, by forming the terminal access portion 40 with the thin portions 42, 42 and the thin portions 44, 44, the outer wall 14B is easily broken by the thin portions 42, 42, and the inner wall 16B is formed by the thin portions 44, 44. It becomes easy to break. Therefore, when the electronic circuit board 150 and the box body 10 are separated in order to identify the location where the trouble has occurred, the thin wall portions 42 and 42 and the thin wall portions 44 and 44 break the outer wall 14B and the inner wall 16B. Thus, an opening can be formed, and the solder connection terminal 15 extending between the electronic circuit board 150 and the base portion 12 can be cut through the opening.

  Here, in order to enable effective access to all the solder connection terminals 15, as shown in FIG. 7, along the inner side wall 16B and the outer side wall 14B in the region where the solder connection terminals 15 are provided. It is preferable to make the width W in the direction along the inner wall 16B and the outer wall 14B of the terminal access portion 40 larger than the length L in the direction.

  As shown in FIG. 7, a guide groove 18 for guiding the side wall 24B of the cover body 20 is formed between the outer wall 14B and the inner wall 16B, and the thin portions 42, 42 of the outer wall 14B are formed. The side wall 24B of the cover body 20 is inserted inside. Therefore, even if the outer wall 14B is divided by the thin portions 42, 42, the solder connection terminals 15 cannot be accessed unless the cover body 20 is removed from the box body 10. Thus, by forming the guide groove 18 into which the side wall 24B of the cover body 20 is inserted inside the thin portions 42, 42 of the outer wall 14B, a configuration preferable for security is obtained.

  Further, as described above, the cover body 20 is attached to the box body 10 by engaging the claw portion 26 of the cover body 20 with the engagement holes 19 of the outer walls 14A and 14C. The cover body 20 cannot be removed from the box body 10 unless the upper part of 24C is pushed inwardly. Such a structure further improves the above-described security effect.

  Further, instead of forming the grooves 13 and 13 on the inner wall 16B to form the thin portions 44 and 44, as shown in FIG. 8, a part of the inner wall 16B may be cut out in advance to form the slit 213. Good. That is, in the example shown in FIG. 8, the terminal access portion 240 that makes it easy to access the solder connection terminal 15 from the outside is configured by the thin portions 42 and 42 of the outer wall 14B and the slit 213 formed in the inner wall 16B. Yes. According to such a configuration, the solder connection terminal 15 can be accessed simply by removing the cover body 20 from the box body 10 and breaking the outer wall 14B with the thin portions 42 and 42.

  Furthermore, instead of forming the grooves 11 and 11 in the outer wall 14B to form the thin portions 42 and 42, as shown in FIG. 9, a part of the outer wall 14B may be cut out in advance to form the slit 311. Good. That is, in the example shown in FIG. 9, the terminal access portion 340 that makes it easy to access the solder connection terminal 15 from the outside is configured by the slit 311 formed on the outer wall 14B and the slit 213 formed on the inner wall 16B. Yes. According to such a configuration, the solder connection terminal 15 can be accessed simply by removing the cover body 20 from the box body 10. Even in this case, since the side wall 24B of the cover body 20 is inserted inside the slit 311 of the outer wall 14B, the solder connection terminal 15 cannot be accessed unless the cover body 20 is removed from the box body 10. Therefore, the security of the electrical junction box 100 can be ensured.

  In the embodiment described above, an example in which the claw portions 26 are formed on the pair of opposing side walls 24A and 24C among the side walls 24A to 24B of the cover body 20 and the engagement holes 19 are formed on the corresponding outer walls 14A and 14C. As described above, the claw portions may be formed on the other pair of opposing side walls 24B and 24D, and the engagement holes 19 may be formed on the corresponding outer walls 14B and 14C.

  Further, in the above-described embodiment, the example in which the claw portion 26 is formed as the engaging portion of the cover body 20 and the engaging hole 19 is formed as the engaged portion of the box body 10 is not limited thereto. The engaging part of the cover body 20 and the engaged part of the box body 10 can be configured by any means capable of engaging the cover body 20 and the box body 10. For example, contrary to the above-described embodiment, an engagement hole may be formed in the cover body 20 as an engagement portion, and a claw portion may be formed in the box body 10 as an engaged portion.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 10 Box body 11 Groove 12 Base 13 Groove 14A-14D Outer side wall 15 Solder connection terminal 16A-16D Inner side wall 17 Positioning rod 18 Guide groove 19 Engagement hole 20 Cover body 22 Upper wall 23 Connector opening 24A-24D Side wall 25 Screw mounting hole 26 Claw part 30 Screw 40 Terminal access part 42 Thin part 44 Thin part 100 Electrical connection box 150 Electronic circuit board 152 Connector 154 Positioning hole 156 Connection hole 213 Slit 240 Terminal access part 311 Slit 340 Terminal access part

Claims (7)

An electronic circuit board on which an electric circuit is formed;
A box body on which the electronic circuit board is mounted;
A cover body covering the box body and the electronic circuit board;
With
The box body is
A base containing electrical components inside,
A wall extending upward from the base at the periphery of the box body;
A solder connection terminal for electrically connecting an electrical component in the base and an electrical circuit of the electronic circuit board by soldering, and a solder connection terminal provided in the vicinity of the wall;
An electrical junction box characterized by comprising:   2. The electrical connection box according to claim 1, wherein the box main body further includes a terminal access portion that facilitates external access to the solder connection terminals between the electronic circuit board and the base portion.   The electrical connection box according to claim 2, wherein the terminal access portion is defined by a thin portion in which the wall is thinned. The cover body has an upper wall and a side wall extending from a peripheral edge of the upper wall;
The electrical connection box according to claim 3, wherein a guide groove into which the side wall of the cover body is inserted is formed inside the thin portion of the wall. The terminal access portion is defined by a slit formed in the wall;
The cover body has an upper wall and a side wall extending from a peripheral edge of the upper wall;
The electrical connection box according to claim 2, wherein a guide groove into which the side wall of the cover body is inserted is formed inside the slit of the wall. The cover body has at least one engaging portion formed on each of at least one pair of opposite side walls of the side walls,
The box body is an engaged portion formed on the wall so as to correspond to the engaging portion of the cover body, and the engaging portion of the cover body guided by the guide groove can be engaged therewith. The electrical connection box according to claim 4, further comprising an engaged portion configured as follows.   7. The electricity according to claim 2, wherein the terminal access portion has a width larger than a length in a direction along the wall of a region where the solder connection terminal is provided. Connection box.

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