JP6011886B2 - Electrical junction box - Google Patents

Description

  The technology disclosed in this specification relates to an electrical junction box.

  2. Description of the Related Art Conventionally, an electronic control device is known in which a circuit board unit in which an electronic circuit unit is assembled is housed in a metal casing. The casing includes a flat box-shaped frame and a lid member that covers the opening of the frame, and is sealed by screwing the frame and the lid member.

JP 2001-223489 A

  By the way, since the metal casing is relatively thin, when it is mounted on a vehicle such as an automobile, it vibrates easily, and the frame and the lid member collide with each other at a portion other than the screwed portion. There was a risk of occurrence. In particular, when an opening is provided in a part of the casing, for example, around the connector, the peripheral edge of the opening has a lower rigidity, so that abnormal noise is more likely to occur.

  The technology disclosed in the present specification has been completed based on the above-described circumstances, and an object thereof is to provide an electrical junction box that hardly generates abnormal noise.

  The technology disclosed in the present specification is an electrical junction box in which a circuit component is accommodated in a casing, and the casing includes a case body made of a synthetic resin that accommodates the circuit component therein, and the circuit A metal cover attached to the case main body so as to cover the structure, and an opening is provided at an edge of a peripheral wall on at least one side of the case main body and the cover. A through piece that extends toward the other side is provided on the peripheral wall on one side of the cover, and a through portion that bulges outward and can receive the through piece is provided on the peripheral wall on the other side, The threading piece or the threading part is provided adjacent to the opening.

  According to such a configuration, since the case main body is made of synthetic resin, compared with a configuration in which the case main body is made of metal and the metal members are in contact with each other over a wide area, the magnitude of the generated abnormal noise is large. The thickness can be reduced. Further, by providing the through piece and the through portion in a portion where the rigidity around the opening is low and easily vibrates, it is possible to suppress collision due to vibration, and thus it is possible to make it difficult to generate abnormal noise itself.

  It is preferable that the width | variety of the said through piece is made small by the level | step-difference part. According to such a configuration, when the case main body and the cover are assembled, the case main body is set such that the stepped portion of the through piece abuts the end surface of the through portion at a position where the normal assembling depth is set. And the cover is prevented from being assembled too deeply.

  Moreover, it is good also as a structure which provides a taper surface in the front-end | tip part of a threading piece. With such a configuration, the threading piece can be smoothly inserted into the threading portion.

  The through piece may be provided on the cover side. With such a configuration, the casing can be more easily manufactured as compared with the configuration in which the through portion is provided on the cover side.

  Further, the case body is provided with a connector portion that can be connected to an external device, and an opening that exposes the connector portion to the outside is provided at a position corresponding to the connector portion of the cover. The connector portion is separated from the case body. The connector housing has a cylindrical hood portion that can receive the mating connector, and extends in a bowl shape from the side surface of the hood portion to the side. It is good also as a structure provided with the collar part distribute | arranged along the inner surface of the surrounding wall of a cover.

  According to such a configuration, when pulling out the mating connector from the connector portion, the collar portion abuts against the peripheral wall of the case body or the peripheral wall of the cover, thereby preventing the connector housing from coming off from the casing. Moreover, since the strength of the portion of the casing against which the flange portion is abutted is increased by the through piece and the through portion, the fixing structure of the other portion of the connector housing with respect to the casing can be reduced in size or simplified.

  According to the technology described in the present specification, it is possible to provide an electrical junction box that is unlikely to generate abnormal noise.

The partial expansion perspective view of the electric junction box of one embodiment Also partially enlarged front view Also partially enlarged plan view A partially enlarged perspective view (before the connector housing is mounted) Also partially enlarged perspective view (with connector housing installed) Front view of connector housing Side view of connector housing Plan sectional view of the connector housing housed in the casing Front view of cover AA sectional view of FIG. Partial enlarged front view of the electrical junction box of another embodiment (when the casing is opened) Also partially enlarged front view (when casing is closed) Similarly, a partially expanded view of the cover

  An embodiment will be described with reference to FIGS.

  The electrical junction box 10 is arranged in a power supply path between a power source such as a battery of a vehicle such as an electric vehicle or a hybrid vehicle and a load including an in-vehicle electrical component such as a lamp or a drive motor, for example, a DC-DC converter. It is used for inverters and the like. In the following description, with respect to the up and down direction, the upper side of FIG. 2 will be referred to as the upper side, and the lower side will be referred to as the lower side.

  As shown in FIG. 1, the electrical junction box 10 is configured by housing a circuit component 11 in a substantially rectangular parallelepiped casing 30. As shown in FIG. 5, the circuit structure 11 includes a heat dissipating member 12, a first circuit board 14 disposed on the upper surface of the heat dissipating member 12, and a predetermined space above the first circuit board 14 in parallel. The second circuit board 16 is provided, and a connector portion 19 that can be connected to an external device (not shown).

  The heat radiating member 12 is made of a metal material having high thermal conductivity such as an aluminum alloy or a copper alloy, the upper surface side is flat, and a large number of heat radiating fins 13 are arranged side by side on the lower surface side. A plurality of screw holes 12 </ b> A (see FIG. 4) for fixing a cover 40 described later are formed on the outer periphery of the heat radiating member 12.

  The first circuit board 14 has a rectangular shape that is fitted inside a frame portion 32 of the case body 31 to be described later, and is configured by overlapping a printed board and a plurality of bus bars (not shown). A printed board is formed by forming a conductive path made of copper foil or the like on an insulating plate made of an insulating material by a printed wiring technique. The plurality of bus bars are formed by punching a metal plate material made of a copper alloy or the like in accordance with the shape of the conductive path, and a part of the end portions are bent into a crank shape and extended toward the front. 15 is formed (see FIG. 4). The first circuit board 14 is fixed to the upper surface of the heat dissipation member 12 by screwing.

  The second circuit board 16 has an area smaller than that of the first circuit board 14 and is fixed to the upper portion of the case body 31 in a posture parallel to the first circuit board 14 at a predetermined interval. The second circuit board 16 has a rectangular shape, and a conductive path made of copper foil or the like is printed on an insulating plate made of an insulating material.

  The second circuit board 16 is fixed to the housing 18A of the control connector 18 by screwing. The housing 18A is made of a synthetic resin and is open in a rectangular tube shape into which the mating connector housing can be fitted, and an L-shaped control terminal 18C is fixed to the back wall 18B (see FIG. 2). .

  The conductive path of the first circuit board 14 and the conductive path of the second circuit board 16 are connected by a plurality of terminals (not shown).

  Among the circuit components 11, the connector portion 19 that can be connected to an external device (not shown) includes a connector housing 20 made of synthetic resin and the pair of connector terminals 15 described above. As shown in FIGS. 4 to 8, the connector housing 20 includes a hood portion 21, a back wall 23 that closes the inside of the hood portion 21, a flange portion 25 that projects from the side surface of the hood portion 21, and a casing. And a pair of fixing pieces 28 for fixing to the 30 side.

  The hood portion 21 has a rectangular tube shape that opens forward so as to cover a mating connector housing (not shown). The bottom wall 21A located on the lower side of the peripheral wall of the hood portion 21 is provided with a reinforcing portion 22 that extends downward over the entire width direction. The front surface of the reinforcing portion 22 is disposed on the rear side of the front end surface of the peripheral wall of the hood portion 21.

  As shown in FIG. 6, a pair of terminal insertion holes 24 through which the pair of connector terminals 15 are inserted are formed through the back wall 23. The terminal insertion hole 24 is formed in a size having a slight gap between the terminal insertion hole 24 and the connector terminal 15.

  The flange portion 25 is integrally provided so as to protrude outward from the upper wall 21B and the side wall 21C of the hood portion 21 at the intermediate portion in the front-rear direction of the connector housing 20, and the left and right protruding dimensions are upward. It is formed larger than the overhang dimension. The back surface of the collar part 25 is set so that it may be arrange | positioned on the same plane as the back surface of the reinforcement part 22 (refer FIG. 7).

  A receiving portion 26 that extends from the center of the upper end of the flange portion 25 toward the rear side is integrally provided on the back surface of the flange portion 25. The receiving portion 26 has a U-shaped cross section that opens downward. The upper surface of the receiving portion 26 is flush with the upper surface of the flange portion 25.

  At the rear end of the upper surface of the receiving portion 26, a locking portion 27 that locks to the upper surface of the second circuit board 16 projects toward one side (the right side in FIGS. 6 and 8). The locking portion 27 extends obliquely upward from the upper surface of the receiving portion 26 toward the outside, and the distal end side extends in the horizontal direction (parallel to the upper surface of the receiving portion 26).

  Further, a pair of plate-like fixing pieces 28 extending toward the side are provided on both side surfaces of the receiving portion 26. The fixed piece 28 is bent in a crank shape and extends laterally, and its front end surface is integrally connected to the back surface of the flange portion 25 and is formed so as to cover the connector terminal 15 disposed on the inside. . The distal end side of the fixed piece 28 is a fixed portion 29 that is arranged in a stepped manner lower than the proximal end side and extends in the horizontal direction, and a receiving hole 29A through which the shaft portion of the screw 50 passes is provided at the center. It is formed through.

  The circuit structure 11 described above is housed in the casing 30 as shown in FIG. The casing 30 includes a synthetic resin case body 31 and a metal cover 40.

  The case main body 31 includes a frame portion 32 (an example of a peripheral wall) formed in a frame shape along the peripheral edge portion of the heat dissipation member 12. The front surface of the frame portion 32 (the left front side in FIG. 5) is partially cut away, and the control connector 18 and the connector portion 19 are arranged in the cut-out portion (an example of an opening). Yes.

  As shown in FIG. 4, the connector housing 20 constituting the connector portion 19 is separated from the case main body 31 and is mounted on the connector mounting portion 33 of the case main body 31. The connector mounting portion 33 is disposed inside the frame portion 32 and is disposed behind the terminal mounting portion 34 for mounting the pair of connector terminals 15. The connector mounting portion 33 is in a band shape facing the back surface of the connector housing 20. The counter wall 35 stands upright, and a pair of left and right pedestal portions 37 provided at a height lower than the counter wall 35 near both front ends of the counter wall 35.

  The front surface of the terminal mounting portion 34 is disposed at a position deeper than the front surface of the frame portion 32 (inside the outer surface of the frame portion 32).

  The central portion in the left-right direction on the front surface of the opposing wall 35 is disposed at a position that supports the raised portion of the connector terminal 15 that is mounted on the terminal mounting portion 34 and bent in a crank shape from the rear. Both left and right end portions of the front surface of the facing wall 35 are disposed at positions that abut against the rear end surface of the fixed piece 28 of the mounted connector housing 20.

  The upper surface of the pedestal portion 37 is a mounting surface on which the fixing portion 29 of the connector housing 20 is mounted, and a receiving hole 29A that can be screwed with the screw 50 is formed. The front surface of the pedestal portion 37 is an abutting surface that comes into contact with the back surface of the flange portion 25 of the connector housing 20. The front surface of the pedestal portion 37 is arranged on the same plane as the front surface of the terminal mounting portion 34.

  A plate-like guide portion 36 that enters the receiving portion 26 of the connector housing 20 and guides the attitude of the connector housing 20 with respect to the case body 31 is provided at the front center of the upper end portion of the facing wall 35. It projects in an L shape toward

  The control connector 18 described above is provided at a predetermined distance from the connector mounting portion 33 at a position adjacent to the right side of the connector mounting portion 33 in FIG.

  Further, a plurality of through portions 38 through which a through piece 44 of a cover 40 described later is inserted are provided on the front surface of the frame portion 32. The through portion 38 has a shape that bulges forward at the lower end of the front surface of the frame portion 32 and penetrates in the vertical direction.

  These through portions 38 are provided adjacent to both sides of the connector mounting portion 33 (connector portion 19) and the control connector 18. In other words, the through portion 38 is provided adjacent to a portion of the frame portion 32 that is cut out so that the connector portion 19 and the control connector 18 are arranged. Specifically, in FIG. 4, the through portion 38 is provided at a total of three locations on the left side of the connector mounting portion 33, between the connector mounting portion 33 and the control connector 18, and on the right side of the control connector 18. Yes.

  These three through portions 38 are formed with different widths in accordance with the outer shape of the case main body 31 (frame portion 32) depending on the positions provided.

  4 is provided with a notch 39 cut out in a rectangular shape from the lower end upward in the left end of FIG. 4, and the screw hole of the heat dissipation member 12 described above is provided in the notch 39. 12A is exposed.

  As shown in FIG. 5, in a state where the connector housing 20 is mounted at the normal position of the connector mounting portion 33, the connector terminal 15 passes through the terminal insertion hole 24 of the back wall 23 and is disposed at the normal position. In addition, one edge portion of the receiving portion 26 and the base end side of the locking portion 27 are arranged in a notch portion 17 provided by cutting out a corner portion of the second circuit board 16 in a rectangular shape, and are arranged in the horizontal direction. The leading end portion of the extended locking portion 27 is overlapped on the edge portion of the notch portion 17.

  In addition, the rear end surfaces of the pair of fixed pieces 28 abut against the opposing wall 35, and the fixed portion 29 is overlaid on the upper surface of the pedestal portion 37 and can be screwed.

  Further, the back surface of the flange portion 25 abuts against the front surface of the pedestal portion 37, and the front surface of the flange portion 25 is disposed on substantially the same plane as the front surface of the frame portion 32.

  Further, the back surface of the reinforcing portion 22 abuts against the front surface of the terminal mounting portion 34.

  On the other hand, the cover 40 is formed in a box shape having an open lower surface by punching and bending a plate-like metal made of aluminum or the like. As shown in FIGS. 5 and 9, the region corresponding to the connector portion 19 and the control connector 18 in the peripheral wall 41 of the cover 40 is substantially rectangular so as to follow the outer shape of each of the connector housings 20 and 18A. The first opening 42 and the second opening 43 are cut out upward from the lower edge.

  The region left between the first opening 42 and the second opening 43 in the peripheral wall 41 is formed in an elongated piece extending downward from the upper edge of the openings 42, 43. The portion is a through piece 44 inserted into the above-described through portion 38.

  The width of the lower end side of the through piece 44 is made smaller by the step portion 45 so that the lower end (tip) side can be inserted into the through portion 38. The lateral width dimension on the lower end side is slightly smaller than the inner width dimension of the through portion 38. Further, the corner portion of the lower end portion of the outer surface of the threading piece 44 and the corner portion of the lower end portion of the side surface are formed as a guide surface 46 (an example of a tapered surface) that is obliquely cut downward. The piece 44 is quickly inserted into the through portion 38.

  Further, the step 45 is abutting surface against the upper surface of the through portion 38. That is, the step portion 45 is set to a position that restricts excessive insertion of the through piece 44 into the through portion 38 when the cover 40 is disposed at the normal position with respect to the case main body 31.

  Further, in FIG. 9, slits extending upward from the lower end edge of the peripheral wall 41 on the left side of the first opening 42 and the right side of the second opening 43 at a predetermined distance from the side edge portions of the openings 42, 43. 47 is formed. A downwardly extending piece-like portion formed between the slits 47 and the side edges of the openings 42 and 43 serves as a through piece 44 that can be inserted into the through portion 38. Similarly, the through pieces 44 are provided with a stepped portion 45 on the lower end (tip) side, and a guide surface 46 is formed at a corner portion of the lower end portion.

  In addition, in the lower edge portion of the peripheral wall 41, an extension portion 48 extending downward is provided in a region corresponding to the screw hole 12A of the heat radiating member 12 described above. 48 is formed with a screw hole 49 through which the screw 50 is passed. The screw 40 is passed through the screw hole 49 and screwed into the screw hole 12 </ b> A of the heat dissipation member 12, whereby the cover 40 is fixed to the heat dissipation member 12 and connected to the ground via the heat dissipation member 12.

  Next, a procedure for assembling the electrical junction box 10 will be described.

  First, the frame portion 32 (case body 31) is attached to the heat dissipation member 12 so as to surround the heat dissipation member 12, and the first circuit board 14 is disposed on the upper surface of the heat dissipation member 12. Further, the control connector 18 and the second circuit board 16 are placed at predetermined positions of the case body 31 and fixed.

  Next, as shown in FIG. 4, the connector housing 20 is moved closer to the connector mounting portion 33 of the case body 31 and moved in the direction of the arrow in the figure. Then, the connector housing 20 is mounted on the connector mounting portion 33 (case body 31) while the receiving portion 26 is guided by the guide portion 36.

  As the connector housing 20 is attached, the connector terminal 15 is inserted into the terminal insertion hole 24. Further, the locking portion 27 formed in the receiving portion 26 enters the cutout portion 17 of the second circuit board 16 and is overlapped with the upper surface of the edge portion of the cutout portion 17.

  Further, the rear end surfaces of the pair of fixing pieces 28 abut against the opposing wall 35, and the fixing portion 29 is overlapped with the upper surface of the pedestal portion 37. Further, the back surface of the flange portion 25 abuts against the front surface of the pedestal portion 37, and the back surface of the reinforcing portion 22 abuts against the front surface of the terminal mounting portion 34. Accordingly, the connector housing 20 is positioned on the case main body 31.

  When the connector housing 20 is mounted at the normal position of the connector mounting portion 33, the connector housing 20 is attached to the case body 31 by screwing the receiving hole 29 </ b> A of the fixing portion 29 and the fixing hole 37 </ b> A of the pedestal portion 37 with screws 50. Fix against.

  In this state, the front surface of the flange portion 25 is disposed on substantially the same plane as the front surface (outer surface) of the frame portion 32.

  When the connector housing 20 is fixed at a predetermined position of the case main body 31 in this way, the cover 40 is attached from the upper side to the case main body 31 so as to cover the circuit component 11 while passing the through piece 44 through the through portion 38. At this time, since the guide surface 46 is formed at the tip of the through piece 44, the through piece 44 is smoothly inserted into the through portion 38 while being guided by the guide surface 46. Further, when the cover 40 is disposed at a normal position with respect to the case body 31, the stepped portion 45 of the through piece 44 abuts on the upper surface of the through portion 38, thereby excessive insertion of the through piece 44 into the through portion 38. Is regulated.

  Finally, the screw 50 is passed through the screw hole 49 of the cover 40 and the screw hole 12A of the heat radiating member 12 superimposed on the screw hole 49, and screwing is performed. Thereby, the cover 40 is fixed to the case main body 31.

  In this state, the front surface of the flange portion 25 of the connector housing 20 is arranged along the inner surface of the peripheral wall 41 of the cover 40 (see FIGS. 8 and 10).

  The operation and effect of this embodiment will be described.

  According to the present embodiment, the casing 30 is composed of the metal cover 40 and the synthetic resin case body 31, and the metal members do not directly collide with each other due to vibration. Even if vibration is applied, the magnitude of the abnormal noise generated can be suppressed.

  In addition, a through piece 44 and a through portion 38 are provided in a portion of the casing 30 around the connector portion 19 and the control connector 18 and the portions around the openings 42 and 43 that have low rigidity and easily vibrate. Therefore, it is possible to make it difficult to generate abnormal noise.

  Further, the threading piece 44 and the threading part 38 are easy to see and are easily aligned.

  Further, since the step portion 45 is provided in the threading piece 44, when the cover 40 is assembled to the case body 31, the step portion 45 abuts against the upper end surface of the passage portion 38, so that the cover 40 is brought into contact with the case body 31. In contrast, excessive sinking can be prevented.

  Further, since the guide surface 46 is provided at the distal end portion of the through piece 44, the through piece 44 can be smoothly inserted into the through portion 38 by the guide surface 46.

  Further, since the through piece 44 is provided on the cover 40 side and the through portion 38 is provided on the case body 31 side, the casing 30 can be manufactured more easily and at a lower cost than the configuration in which these are provided in reverse. can do.

  The connector housing 20 is provided with the flange 25, and when the cover 40 is assembled to the case body 31, the flange 25 is arranged along the inner surface of the peripheral wall 41 of the cover 40 (see FIGS. 8 and 10). Therefore, when the mating connector is pulled out from the connector portion 19, the flange portion 25 abuts against the inner surface of the peripheral wall 41 of the cover 40 and acts as a retaining member. Moreover, part of the portion of the peripheral wall 41 with which the flange portion 25 abuts is a through piece 44, and the strength is increased by inserting the tip side of the through piece 44 into the through portion 38. Even when a large force is applied, the stopper can be firmly secured. That is, the fixing structure of the other part with respect to the case main body 31 of the connector housing 20 can be reduced in size or simplified.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiment described with reference to the above description and the drawings. For example, the following embodiments are also included in the technical scope.

  (1) In the above embodiment, the through portion 38 is provided on the case main body 31 side and the through piece 44 is provided on the cover 40 side. That is, as shown in FIGS. 11 to 13, the through portion 141 may be provided on the cover 140 side and the through piece 132 may be provided on the case body 131 side.

  The through piece 132 can be formed by providing the case main body 131 with a protruding piece extending upward. Further, as shown in FIG. 13, for example, the through-hole 141 is provided with a pair of extending portions 144 that extend from the side edge toward the side at the side edge of the opening 142 of the cover 140. The protruding portion 144 can be formed by folding back.

  (2) The form of the threading piece 44 is not limited to the above embodiment, and can be changed as appropriate. For example, the step 45 and the guide surface 46 are not necessarily provided and may be omitted. Further, for example, in order to prevent the threading piece 44 from rattling in the threading portion 38, the threading piece 44 is formed in a corrugated shape having irregularities in the plate surface direction, or bulges in the width direction of the threading piece 44. It is good also as a structure which provides an elasticity provision part.

  (3) The configuration of the connector housing 20 is not limited to the above embodiment, and may be other configurations. For example, the collar portion 25 can be omitted.

  (4) In the above embodiment, the connector portion 19 is configured by attaching the connector housing 20 separate from the case main body 31 to the connector mounting portion 33, but is configured by providing the connector housing integrally with the case main body 31. May be.

  (5) In the above embodiment, the flange portion 25 of the connector housing 20 is arranged along the inner surface of the peripheral wall 41 of the cover 40, but the arrangement is arranged along the inner surface of the frame portion 32 of the case body 31. It is good. Also in this case, the collar part 25 acts as a stopper.

DESCRIPTION OF SYMBOLS 10 ... Electrical junction box 11 ... Circuit structure 12 ... Radiating member 19 ... Connector part 20 ... Connector housing 21 ... Hood part 25 ... Eaves part 30 ... Casing 31 ... Case main body 32 ... Frame part (peripheral wall)
33 ... Connector mounting part 38 ... Through part 40 ... Cover 41 ... Peripheral wall 42 ... 1st opening 43 ... 2nd opening 44 ... Through piece 45 ... Step part 46 ... Guide surface (taper surface)

Claims (5)

An electrical junction box containing a circuit component in a casing,
The casing includes a case body made of a synthetic resin that houses the circuit structure therein, and a metal cover that is attached to the case body so as to cover the circuit structure body,
An opening is provided at an edge of the peripheral wall on at least one side of the case body and the cover,
A through piece extending toward the other side is provided on the peripheral wall on one side of the case main body or the cover, and a through portion that bulges outward and receives the through piece is provided on the peripheral wall on the other side. And
The threading piece or the threading portion is an electrical connection box provided adjacent to the opening. The electrical connection box according to claim 1, wherein a width of the leading end side of the through piece is reduced by a step portion. The electrical junction box according to claim 1, wherein a tapered surface is provided at a tip portion of the threading piece. The electrical connection box according to claim 1, wherein the through piece is provided on the cover side. The case body is provided with a connector portion connectable to an external device, and the opening that exposes the connector portion to the outside is provided at a position corresponding to the connector portion of the cover.
The connector part has a connector housing separate from the case body,
The connector housing has a cylindrical hood portion capable of receiving a mating connector, and extends in a bowl shape from the side surface of the hood portion to the side, and the peripheral wall of the case body or the cover The electrical junction box according to claim 1, further comprising a flange portion disposed along the inner surface of the peripheral wall.

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