JP5888801B1 - Electrical junction box - Google Patents

Abstract

An electrical junction box capable of improving the work efficiency of an attachment work is provided. An electrical connection box includes a connection box body having a mounting portion to which an electronic control unit is attached, and a cover having a peripheral wall portion and covering the electronic control unit mounted on the connection box body. The connection box body is formed around the mounting portion where the electronic control unit is mounted, and corresponds to the pair of side portions of the guide groove and the guide groove into which the peripheral wall portion of the cover having a pair of side portions parallel to each other is fitted. And a temporary locking groove extending from each of the two groove portions. The cover can be placed in a temporarily locked state in which the peripheral wall portion is fitted over both the guide groove and the temporary locking groove by sliding from the fixed state where the peripheral wall portion is fitted along the guide groove to the temporary locking groove side. . In addition, the cover includes an interference avoiding portion that prevents interference between the peripheral wall portion of the cover and the end portion of the temporary locking groove when at least one of the connection box main body and the cover is temporarily fixed. [Selection] Figure 7

Description

  The present invention relates to an electrical junction box on which an electronic control unit such as an ECU is mounted.

  As an electrical connection box on which an electronic control unit such as an ECU is mounted, for example, an electronic control unit is placed on the upper part of the case of the electrical connection box in which an internal unit (internal circuit) having a common wiring pattern including a bus bar is accommodated. Is known (see Patent Document 1 below). In this electrical junction box, it is necessary to transport the electrical junction box body before attaching the electronic control unit to the electrical junction box body. Therefore, the cover that covers the electrical control unit is oriented 180 ° with respect to the electrical junction box body. It is temporarily fixed by rotating to protect the mounting part of the electronic control unit.

Japanese Patent No. 4064766

  In the electric junction box of the prior art disclosed in the above-mentioned Patent Document 1, there is a problem that if the cover is incorrectly attached to the electric junction box, it is in a fixed state and it becomes difficult to remove the cover. It was.

  An object of the present invention is to provide an electrical junction box that can solve the above-described problems caused by the prior art and improve work efficiency.

  An electrical connection box according to an embodiment of the present invention includes a connection box main body having a mounting portion on which an electronic control unit is mounted, and a cover for covering the electronic control unit mounted on the connection box main body. . The cover includes a cover upper surface portion and a peripheral wall portion extending downward from a peripheral edge of the cover upper surface portion. The connection box main body is a guide groove formed around the mounting portion to which the electronic control unit is mounted and into which the peripheral wall portion of the cover is fitted, and has a pair of side portions parallel to each other, and the guide groove A temporary locking groove extending from each of the pair of sides. The cover can be arranged in a permanently fixed state in which the peripheral wall portion fits along the guide groove and in a temporarily fixed state in which the peripheral wall portion fits over both the guide groove and the temporary locking groove. Moreover, the said cover has an interference avoidance part in which at least one of the said connection box main body and a cover prevents interference with the peripheral wall part of the said cover, and the edge part of the said temporary latching groove in the said temporarily fixed state.

  In the electrical junction box according to this embodiment, the peripheral wall portion can be disposed in a fixed locking state in which the peripheral wall portion fits along the guide groove, and the peripheral wall portion can be disposed in a temporarily fixed state in which the peripheral wall portion fits over both the guide groove and the temporary locking groove. . Therefore, since the position of the cover is clearly different between the temporarily fixed state and the permanently fixed state, it is possible to prevent the cover from being erroneously set to the permanently fixed state before the electronic control unit is attached. In this embodiment, it is not necessary to rotate the cover by 180 °, and the cover can be attached more efficiently.

  The connection box body contains an internal circuit, a connection part for connecting the internal circuit and the electronic control part attached to the attachment part, and a positioning projection for positioning the electronic control part on the attachment part; The cover may cover the connection portion and the positioning protrusion in both the final fixed state and the temporary fixed state. When the electrical junction box is configured in this way, it is possible to suitably protect the terminal portion and the positioning projection by setting the cover in a temporarily locked state, for example, during conveyance of the electrical junction box.

  Moreover, it is also possible to provide a convex portion that increases the coupling force between the peripheral wall portion and the temporary locking groove on at least one of the portion of the peripheral wall portion that fits into the temporary locking groove and the temporary locking groove. . This convex portion can increase the holding force of the cover when the cover is temporarily fixed to the junction box body.

  The peripheral wall portion and the guide groove may be provided with a positioning portion that performs positioning in the extending direction of the pair of side portions. Thereby, the cover is less likely to be displaced with respect to the junction box body, and the holding force is further increased.

  In addition, the cover may have a positioning recess on the inner side of the peripheral wall portion to which the positioning projection fits during temporary fixing. Thereby, the cover is less likely to be displaced with respect to the junction box body, and the holding force is further increased.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical junction box which can improve the work efficiency of attachment work can be provided.

It is a perspective view which shows the external appearance of the electrical-connection box 1 which concerns on the 1st Embodiment of this invention. 2 is an exploded perspective view showing an overall configuration of the electric junction box 1. FIG. It is the arrow view seen from A of FIG. FIG. 2 is an exploded perspective view showing a junction box body 2 and a cover 50 of the electrical junction box 1. 3 is an enlarged view of a part of the electric junction box 1. FIG. It is a perspective view which shows the state which attached the control board 40 to the junction box main body 2 of the same electrical junction box. It is a perspective view which shows the state which temporarily fixed the cover 50 to the connection box main body 2. FIG.

  Hereinafter, an electrical junction box according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[Configuration of Electrical Junction Box According to First Embodiment]
1 is a perspective view showing the external appearance of the electrical junction box according to the first embodiment of the present invention, FIG. 2 is an exploded perspective view showing the overall configuration of the electrical junction box, and FIG. 3 is viewed from A in FIG. It is an arrow view. As shown in FIGS. 1 to 3, the electrical junction box 1 according to the present embodiment includes an electronic control unit (hereinafter referred to as “control board”) including a junction box body 2 and a control board mounted on the junction box body 2. 40) and a cover 50 that is attached to the upper surface side of the case of the junction box body 2 and covers the control board 40.

  The junction box body 2 is configured by accommodating an internal circuit 20 inside a rectangular case portion 10. That is, the junction box body 2 is placed on the lower case housing 11 disposed on the bottom surface side of the junction box body 2 and the lower case housing 11 in order, for example, to form the internal circuit 20. The wiring members 21, 22 and 23, and the upper case housing 12 attached to the lower case housing 11 from above the third wiring member 23. Both case housings 11 and 12 can be attached to and detached from each other by a known fitting guide mechanism 13 comprising engaging protrusions formed at positions corresponding to each other on the side surfaces and engaging grooves into which the protrusions are fitted. The case portion 10 is configured by being engaged with the case. The case part 10 and the cover 50 are made of, for example, a resin molded member.

  The internal circuit 20 is an electrical circuit for electrical connection (for power distribution) including electrical parts such as bus bars, relays, and fuses, and is mainly configured as a circuit that bears the power distribution function in the electrical connection box 1. The internal circuit 20 is designed in advance so that it can be applied without changing the circuit pattern of the internal circuit 20 in the case unit 10 even if the circuit design of the electrical junction box 1 is changed.

  As shown in FIG. 3, the lower case housing 11 has a relay portion 15 and other connector portions formed on the bottom surface side, and a plurality of terminals for accommodating various terminals of the internal circuit 20 as shown in FIG. A terminal accommodating chamber 17 is formed through. The lower case housing 11 is formed with a plurality of positioning bosses 19 (positioning protrusions) that extend upward from the bottom surface by a predetermined length and penetrate the upper case housing 12. Furthermore, the lower case housing 11 is formed with a screw hole 49 into which a screw 47 for screwing and fixing to the upper case housing 12 is screwed at a predetermined position.

  As shown in FIG. 2, the first wiring member 21 includes a bus bar and an insulating plate that supports the bus bar. The first wiring member 21 is positioned so that the positioning boss 19 is inserted into a boss insertion hole provided at a predetermined position. It is placed on the case housing 11. The first wiring member 21 has a bus bar circuit formed of, for example, a bus bar 25 on an insulating plate. From the bus bar circuit, a tab terminal extending upward, or a terminal housing of the lower case housing 11 extending downward is provided. A plurality of crimp terminals accommodated in the chamber 17 are provided.

  The second wiring member 22 includes a bus bar and an insulating plate that supports the bus bar, and the first wiring member 21 is inserted into the boss insertion hole 28 provided at a predetermined position. Placed on the top. The second wiring member 22 has a bus bar circuit (not shown) formed on, for example, an insulating plate. From the bus bar circuit, a tab terminal 26 extending upward and a terminal of the lower case housing 11 extending downward are provided. A plurality of press contact terminals accommodated in the accommodating chamber 17 are provided. Further, the second wiring member 22 is mounted with a plurality of connection terminals 24 electrically connected to the bus bar circuit and extending upward, and electronic components 29 such as relays and fuses.

  Note that the second wiring member 22 also serves as a relay board between the internal circuit 20 and the control board 40, and the connection terminal 24 functions as a relay terminal. Since the internal circuit 20 and the control board 40 are connected by soldering the connection terminals 24 that pass through the connection holes 44 described later, the internal circuit 20 and the control board 40 are connected by a connector. In comparison, it is possible to easily connect at low cost while suppressing the height in the vertical direction and the width and length in the horizontal direction.

  The third wiring member 23 is made of a printed wiring board or the like, and is placed on the second wiring member 22 so that the positioning boss 19 is inserted into the boss insertion hole 32 provided at a predetermined position. Is done. The third wiring member 23 is formed with, for example, a wiring (not shown) on an insulating substrate, and the wiring terminal 27 extends downward and is accommodated in the terminal accommodating chamber 17 of the lower case housing 11. Are connected. Further, a connection hole 44 is provided in the third wiring member 23, and when the third wiring member 23 is placed, the connection terminal 24 is inserted into the connection hole 44. The connection terminal 24 is connected to the wiring provided on the third wiring material 23 by soldering.

  FIG. 4 is an exploded perspective view showing the connection box body 2 and the cover 50 assembled as a semi-assembled part before the control board 40 is mounted on the connection box body 2. As shown in FIG. 4, the upper case housing 12 is mounted with a connector portion 14 to which an external connector (not shown) is fitted and connected, and a control board 40 which will be described later and is attached to the case portion 10 and covered with a cover 50. A mounting portion 16 and a pair of side wall portions 61 that face the side surface of the mounting portion 16 and extend in a direction along the side surface are provided.

  The mounting portion 16 is formed in a flat shape without a so-called peripheral wall between the convex portions 12a and 12b formed at both ends in the longitudinal direction of the upper case housing 12 on the upper surface of the upper case housing 12 constituting the upper surface of the case portion 10. ing. Further, the mounting portion 16 includes a substrate support portion 18 that supports the mounted control board 40 from the lower surface side, and a connection terminal 24 that extends upward from the internal circuit 20 from the inside of the case portion 10 to the mounting portion 16. A terminal hole 31 to be inserted is formed. Further, a boss insertion hole 32 is formed in the mounting portion 16 at a corresponding position where the boss 19 of the lower case housing 11 is inserted.

  In addition, a screw hole 48 (FIG. 2) is formed in the mounting portion 16 of the upper case housing 12 at a position corresponding to the screwing hole 49 of the lower case housing 11. Accordingly, both the case housings 11 and 12 are engaged by the above-described fitting guide mechanism 13, and both can be fixed by screws with the screws 47.

  Thereby, in this Embodiment, it becomes possible to complete and provide the electrical junction box 2 which accommodated the internal circuit 20 in the case part 10 as one semi-assembly component. That is, the internal circuit 20 side can be configured in advance as a completed electric system, and the control board 40 having electronic circuits of various circuit patterns is combined in accordance with this. And in the junction box main body 2 of this Embodiment, it becomes possible to implement | achieve extremely high versatility, without using the case part 10 which changes for every vehicle model or grade, for example.

  And since the connection terminal 24 of the internal circuit 20 is exposed from the terminal hole 31 in the state where the connection box body 2 is completed as a semi-assy component as described above, not only the appearance inspection but also the exposed connection terminal Various tests such as a withstand voltage test for applying a voltage to the internal circuit 20 using 24 can be performed.

  The board support section 18 supports the vicinity of the outer peripheral edge of the control board 40 mounted on the mounting section 16 along the outer periphery of the board except for the side surface side of the case section 10 near the position where the terminal hole 31 is formed. It is formed in a shape. That is, the substrate support portion 18 is formed so that the side wall of the mounting portion 16 is cut away in the vicinity of the position where the terminal hole portion 31 is formed.

  FIG. 6 is a perspective view showing a state in which the control board 40 is attached to the junction box body 2. As shown in FIG. 6, for example, an electronic circuit on which an electronic component 41 connected to the internal circuit 20 is mounted is formed on the control board 40 mounted on the mounting unit 16 and mounted on the case unit 10. . The control board 40 is detachably attached to the case unit 10. For example, the type of the control board to be attached is changed according to different control specifications for each vehicle type or grade.

  A plurality of electronic components 41 are mounted on the control board 40, and a connector portion 42 that is disposed at a predetermined location on the board and is connected to an external connector of an external circuit (not shown) is mounted. The control board 40 is provided with a connection hole 44 into which the connection terminal 24 provided in the internal circuit 20 is inserted and connected by soldering, and a boss insertion hole through which the boss 19 extending from the lower case housing 11 is inserted. 43 is provided at a predetermined location.

  Furthermore, a screw hole 45 (FIG. 2) corresponding to the screwing hole 18 a (FIG. 2) formed at a predetermined position of the board support portion 18 of the mounting portion 16 is formed at a predetermined position on the outer peripheral edge portion of the control board 40. Has been. As a result, the control board 40 is mounted on the mounting portion 16 and then fixed to the case portion 10 by the screws 46 and fixed thereto.

  In addition, the connection state by the solder connection between the connection terminal 24 of the internal circuit 20 and the control board 40 has no peripheral wall in the mounting portion 16 and the mounting portion 16 near the position where the terminal hole portion 31 is formed, as shown in FIG. Since the side wall is formed so as to be cut out and the substrate support portion 18 is formed on the back side of the terminal hole portion 31 when viewed from the side, it can be easily confirmed from the side surface of the case portion 10 by visual recognition. it can.

  As shown in FIG. 4, the cover 50 includes a cover upper surface portion 71 and a peripheral wall portion 52 extending downward from the periphery of the cover upper surface portion 71 and extending so as to surround and cover the outer peripheral side of the control board 40. . A screw hole 59 for inserting the screw 58 and stopping the cover 50 is formed in the cover upper surface portion 71 at a location corresponding to the screw hole 19a at the tip of the boss 19 extending from the lower case housing 11, for example. Further, the cover upper surface portion 71 is formed with a connector attachment portion 51 in which a connector portion 42 provided on the control board 40 attached to the case portion 10 is disposed.

  A side surface 52a of the peripheral wall 52 facing the guide groove 10a extends downward so as to be inserted into the guide groove 10a and the temporary locking groove 10b. A plurality of notches 72 formed at the same interval as the positioning protrusions 62 are formed on the lower surface of the side surface 52a. Further, notches 73 are formed at the ends of the plurality of notches 72 on the temporary locking groove 10b side. Further, engaging claws 74 are respectively formed on the surface 52c of the peripheral wall 52 on the temporary locking groove 10b side and the surface 52b facing the surface 52c. The engaging claw 74 engages with an engaging hole 12c formed on the side surfaces of the convex portions 12a and 12b of the upper case housing 12 facing each other during the main fixing. Further, a positioning recess 19 b (positioning mechanism) that fits with the tip of the boss 19 is formed on the inner surface of the surface 52 b of the peripheral wall portion 52.

[Temporary fixing state of electrical junction box according to first embodiment]
In the present embodiment, as shown in FIG. 4, the cover 50 is temporarily fixed to the connection box body 2 assembled as a semi-assembled part before the control board 40 is mounted, and the connection terminals 24 and the bosses 19 are protected by the cover 50. Transport in the state that was done. Hereinafter, this state is referred to as a temporarily fixed state.

  FIG. 5 is an enlarged view of a part of the electrical junction box 1 according to the present embodiment for explaining a configuration for temporarily fixing the cover. As shown in FIG. 5, the guide groove 10 a into which the peripheral wall portion 52 of the cover 50 is fitted around the mounting portion 16 including a pair of sides between the side surface 16 a and the side wall portion 61 of the mounting portion 16. Is formed. Positioning protrusions 62 that form a plurality of positioning portions at predetermined intervals along the longitudinal direction are formed on the pair of side portions of the guide groove 10a. A temporary locking groove 10b extended in the direction in which the side wall 61 extends is connected to the guide groove 10a. That is, the guide groove 10a and the temporary locking groove 10b form one continuous groove. On the side surface of the temporary locking groove 10, a convex portion 63 is formed to ensure the coupling strength when the cover 50 is temporarily locked.

  FIG. 7 is a perspective view showing a state in which the cover 50 is temporarily fixed to the junction box body 2. When the cover 50 is temporarily fixed to the junction box body 2, the cover 50 can be easily removed without damaging the junction box body 2.

  When the cover 50 is temporarily fixed to the connection box main body 2, the cover 50 includes the connector portion 14 formed on a part of the mounting portion 16 including the terminal hole portion 31, the boss 19, and the convex portion 12 a behind the connection box main body 2. cover. Further, a portion from the front end portion of the side surface 52a of the peripheral wall portion 52 to a portion where the notch 73 is formed is inserted into the guide groove 10a and the temporary locking groove 10b, and the notches 72 formed therein are respectively positioning protrusions 62. Engage with. However, the notch 72 does not engage with the positioning protrusion 62 farthest from the temporary locking groove 10b. Further, a part of the surface 52a is detachably sandwiched by the convex portion 63 and the side surface 16a of the mounting portion 16 or by the pair of convex portions 63 formed on the pair of side wall portions 61, respectively. The notch 73 engages with the end of the temporary locking groove 10b. The lower surface of the surface 52 b of the peripheral wall portion 52 abuts on the mounting portion 16, and the positioning mechanism 19 b engages with the boss 19. The inner side of the surface 52c of the peripheral wall portion 52 is in contact with the back surface of the upper case housing 12, and covers the connector portion 14 from the back surface.

[Fixed state of the electrical junction box according to the first embodiment]
In the present embodiment, the cover 50 is removed from the electrical connection box transported in the temporarily fixed state, the control board 40 is attached to the connection box body 2, and the cover 50 is permanently fixed to the connection box body 2. Thereby, it is possible to manufacture the electrical junction box 1 according to the present embodiment.

  As shown in FIG. 1, when the cover 50 according to the present embodiment is permanently fixed to the junction box body 2, the cover 50 has the connector portion 42 exposed through the connector mounting portion 51 and the screw hole 59 (FIG. 4). ) To cover the mounting portion 16 so that the screw hole 19a (FIG. 4) at the tip of the boss 19 (FIG. 4) is exposed. Further, the side surface 52a of the peripheral wall portion 52 is inserted into the guide groove 10a, and the notch 72 and the notch 73 (FIG. 4) formed here engage with the positioning projections 62, respectively. Further, the engaging claws 74 formed on the front and rear side surfaces 52 b and 52 c of the cover 50 engage with the engaging holes 12 c formed on the opposing surfaces of the convex portions 12 a and 12 b of the upper case housing 12.

  Therefore, in the electrical junction box 1 according to the present embodiment, the position of the cover 50 is clearly different between the temporarily fixed state and the permanently fixed state, so that the book of the junction box body 2 is mistakenly attached before the control board 40 is attached. It is possible to prevent the cover 50 from being attached to the attachment position. In the present embodiment, it is not necessary to rotate the cover 50 by 180 °, and the cover 50 can be attached more efficiently.

[Other embodiments]
In the first embodiment, the convex portion 63 is formed on the inner surface of the side wall portion 61. However, it is also possible to provide a convex portion on the side surface 52a of the cover 50, for example. In this case, for example, when the cover 50 is permanently fixed, it is also conceivable to provide a groove having the same width as the convex portion in the corresponding portion of the inner surface of the side wall portion 61 so that the side wall portion 61 and the convex portion do not interfere with each other. . Further, the functions and configurations of the internal circuit 20 and the control board 40 to be mounted can be changed as appropriate.

  DESCRIPTION OF SYMBOLS 1 ... Electrical junction box, 2 ... Junction box main body, 10 ... Case part, 10a ... Guide groove, 10b ... Temporary locking groove, 11 ... Lower case housing, 12 ... Upper case housing, 13 ... Fitting guide mechanism, 14 ... Connector part, 15 ... Relay part, 16 ... Mounting part, 17 ... Terminal accommodating chamber, 18 ... Board support part, 19 ... Boss, 20 ... Internal circuit, 21 ... First wiring material, 22 ... Second wiring material, 23 ... third wiring member, 24 ... connection terminal, 28 ... boss insertion hole, 31 ... terminal hole portion, 40 ... electronic control unit (control board), 42 ... connector portion, 44 ... connection hole, 50 ... cover, 51 DESCRIPTION OF SYMBOLS Connector attaching part 52 ... Peripheral wall part 61 ... Side wall part 62 ... Protrusion for positioning 63 ... Protruding part 71 ... Cover upper surface part, 72, 73 ... Notch, 74 ... Engagement nail | claw.

Claims (5)

A junction box body having a mounting portion to which the electronic control unit is mounted;
An electrical junction box comprising: a cover for covering the electronic control unit mounted on the junction box body;
The cover has a cover upper surface portion and a peripheral wall portion extending downward from the periphery of the cover upper surface portion.
The junction box body is
A guide groove that is formed around a mounting portion on which the electronic control unit is mounted, and into which a peripheral wall portion of the cover fits, and has a pair of side portions parallel to each other;
A temporary locking groove extending from each of the pair of side portions of the guide groove,
The cover is
The peripheral wall portion can be arranged in a final fixed state in which the peripheral wall portion is fitted along the guide groove, and a temporary fixed state in which the peripheral wall portion is fitted over both the guide groove and the temporary locking groove,
At least one of the junction box main body and the cover has an interference avoiding portion that prevents interference between the peripheral wall portion of the cover and the end of the temporary locking groove in the temporarily fixed state. The junction box body is
Houses internal circuitry,
A connecting portion for connecting the internal circuit and the electronic control portion mounted on the mounting portion;
A positioning projection for positioning the electronic control unit on the mounting unit;
The electrical connection box according to claim 1, wherein the cover covers the connection portion and the positioning protrusion in both the final fixed state and the temporarily fixed state. The convex part which raises the coupling force of the peripheral wall part and the temporary locking groove is provided in at least one of the part which fits into the temporary locking groove of the peripheral wall part, and the temporary locking groove. Or the electrical junction box of 2. The electrical connection box according to any one of claims 1 to 3, further comprising: a positioning portion that performs positioning in the extending direction of the pair of side portions in the peripheral wall portion and the guide groove. The cover is
The electrical connection box according to claim 2, further comprising: a positioning recessed portion into which the positioning protrusion is fitted during the temporary fixing.

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