JP2014075917A - Electric connection box - Google Patents

Abstract

In an electrical junction box having a lower part mounting part, it is possible to improve the workability of attaching and detaching electrical parts to and from the lower part mounting part and to advantageously prevent water from entering the lower part mounting part. To provide an electrical junction box with a new structure.
An electrical connection including an internal circuit is accommodated in a case, and a lower component mounting portion is formed on the lower surface of the case to which an electrical component connected to the internal circuit is mounted. In the box 10, a waterproof wall 56 that is inclined obliquely outward from the periphery 52 of the lower part mounting portion 26 and protrudes downward is provided.
[Selection] Figure 6

Description

  The present invention relates to an electrical junction box having an electrical component mounting portion connected to an internal circuit, and more particularly to an electrical junction box having a component mounting portion opened downward.

  Conventionally, in electrical systems such as automobiles, electrical connection boxes with electrical components such as fuses and relays arranged in a space-efficient manner have been used in the right places, and power distribution and control from batteries to various electrical components is efficient. To be done. For example, as described in Japanese Patent Application Laid-Open No. 2009-290941 (Patent Document 1), such an electrical junction box accommodates an internal circuit composed of a printed circuit board or the like in a case. A component mounting portion on which an electrical component such as a connector or a fuse to be connected is mounted is formed on the surface of the case.

  In such an electrical junction box, not only the upper part mounting part opening on the upper surface of the case but also the lower part mounting part opening on the lower surface of the case is provided to meet the recent demands for miniaturization and higher density. Opening is performed. In particular, in the lower part mounting part that opens below the case, the water that adheres to the surface of the case and flows down flows from the lower edge of the case to the opening of the lower part mounting part, and the water is the lower part mounting part. There is a risk of entering the case through a gap between the mounting portion and the mounted electrical component due to capillary action. As a result, there is a concern that a short circuit or corrosion problem may occur in the internal circuit of the case.

  Therefore, as illustrated in FIG. 12 of Patent Document 1, a waterproof wall constituted by a case or the like is formed around the lower component mounting portion so as to protrude downward from the lower end edge of the lower component mounting portion. The structure which prevents the water which flowed down below reaches | attains the opening part of a lower part mounting part is proposed.

  However, if a waterproof wall that protrudes downward beyond the lower edge of the lower part mounting part is provided around the lower part mounting part, there is a problem that it becomes difficult to attach and detach the electrical component to the lower part mounting part. It was. In particular, since the waterproof wall protrudes downward in a state of being substantially parallel to the lower component mounting portion, the electrical component may interfere with the waterproof wall with a slight misalignment, which may damage the terminal portion of the electrical component. It was.

JP 2009-290941 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is to improve the workability of attaching / detaching electrical components to / from the lower component mounting portion in the electrical junction box having the lower component mounting portion. Another object of the present invention is to provide an electrical junction box having a novel structure that can advantageously prevent water from entering the lower part mounting portion.

  According to a first aspect of the present invention, an internal circuit is housed in a case, and a lower component mounting portion is provided in which an electrical component that is formed in an opening on the lower surface of the case and connected to the internal circuit is mounted. The electrical junction box is characterized in that a waterproof wall is provided that projects obliquely outward from the periphery of the lower component mounting portion and protrudes downward.

  In the present invention, the waterproof wall projecting around the lower component mounting portion is formed so as to protrude downward while inclining obliquely outward, so that the open end (lower end edge) of the lower component mounting portion And a large separation distance between the protruding end of the waterproof wall. Therefore, a large space is secured around the lower component mounting portion, and the work of attaching and detaching the electrical component to the lower component mounting portion is facilitated, thereby improving workability. Moreover, since the protruding end of the waterproof wall can be greatly separated from the opening end of the lower part mounting part, the water that has flowed down the case surface and reached the protruding end of the waterproof wall is opened to the lower part mounting part. It can be made to detach | leave from a case toward the downward direction in the position away from the edge part. Thereby, water entering the lower part mounting portion can be advantageously prevented.

  The waterproof wall may be configured by separately forming a wall portion protruding from the lower surface of the case around the lower component mounting portion, or as described in Patent Document 1, the side wall of the case may be You may make it extend. In addition, it is desirable that the waterproof wall is formed continuously over the entire periphery of the lower part mounting portion, but there is no possibility that water flowing down the case surface in relation to other members passes or is low. It may be divided at any location in the circumferential direction.

  In addition, when the waterproof wall is configured by a wall portion protruding from the lower surface of the case, the angle formed by the outer peripheral surface of the waterproof wall and the lower surface of the case can be an acute angle. When the angle of the acute angle portion is small to some extent, the water that has flowed down the case surface and reaches the base end of the waterproof wall can be trapped in the gap between the acute angle portions using the surface tension of the water. Therefore, the trapped water can be guided to the drainage region by connecting the acute angle portion to the safe drainage region.

  A second aspect of the present invention is the one described in the first aspect, wherein an angle formed by the outer peripheral surface of the waterproof wall and the protruding end surface is an acute angle.

  According to this aspect, the outer peripheral side end of the waterproof wall is an acute angle, and the protruding end surface of the waterproof wall is an inclined surface that is inclined obliquely upward from the outer peripheral side toward the inner peripheral side. As a result, the water that has reached the protruding end surface of the waterproof wall through the outer peripheral surface of the waterproof wall is likely to flow downward at the outer peripheral side end portion having an acute angle, and such water travels along the protruding end surface of the waterproof wall. It is possible to advantageously prevent the wrapping around the inner peripheral surface. Thereby, water entering the lower part mounting portion can be more advantageously prevented.

  In the present invention, since a waterproof wall is provided that is inclined obliquely outward from the periphery of the lower component mounting portion and protrudes downward, a large space is secured around the lower component mounting portion, and the lower component mounting portion is mounted. This improves the workability of attaching and detaching the electrical component to the part. Moreover, the water that has flowed down the surface of the case and reached the protruding end of the waterproof wall can be separated from the case downward at a position away from the opening end of the lower part mounting portion. Thereby, water entering the lower part mounting portion can be advantageously prevented.

The disassembled perspective view of the electrical-connection box as one Embodiment of this invention. The front view of a main-body part. The rear view of a main-body part. The bottom view of the main-body part shown in FIG. The front view of the assembly | attachment state of the cover and main-body part of the electrical-connection box shown in FIG. The principal part enlarged view in the VI-VI cross section of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG. 1 shows an electrical junction box 10 as an embodiment of the present invention. The electrical junction box 10 includes a main body portion 12 and a cover 14, and the main body portion 12 is accommodated in the cover 14 and assembled when the cover 14 is extrapolated to the main body portion 12. The electrical junction box 10 is housed in another electrical junction box such as a relay box and mounted on a vehicle such as an automobile.

  2 to 3 show the main body 12. The main body 12 has a rectangular block shape as a whole. The main body 12 has a structure in which a printed circuit board 18 as an internal circuit is assembled and accommodated in a frame 16 formed of synthetic resin. The internal circuit is not limited to the printed circuit board 18 and may be a bus bar or the like. The main body 12 is mounted on the vehicle with the vertical direction in FIG. 2 as the vertical vertical direction. In the following description, the vertical direction refers to the vertical direction in FIG. As is clear from the above description, in the present embodiment, the case constituting the outer shell of the electrical junction box 10 is constituted by the cover 14 and the frame body 16.

  The frame 16 has a substantially longitudinal rectangular frame shape with a central hole 20 penetrating in the center, and has four side walls 22a, 22b, 22c, and 22d. As shown in FIG. 2, a plurality of fuse terminal insertion holes (not shown) through which fuse terminals 38 to be described later are inserted are formed in approximately half of the upper surface of the frame body 16 in the longitudinal direction. In addition, a plurality of connector mounting portions 24 into which connector terminals 40 (to be described later) are inserted are formed side by side in the longitudinal direction of the frame body 16 at the lower portion of the frame body 16. The plurality of connector mounting portions 24 are formed in the lower surface 25 of the frame 16 constituting the case so as to form a lower component mounting portion 26 as a whole.

  In addition, flange portions 28 are formed at the lower end portions of the side walls 22a, 22b, 22c, and 22d of the frame body 16 constituting the main body portion 12, respectively. As apparent from FIGS. 1 to 3, the flange portion 28 protrudes outwardly from the side walls 22 a, 22 b, 22 c, and 22 d of the frame body 16 and extends over substantially the entire circumference of the frame body 16. It is formed continuously.

  A plurality of lock claws 32 are formed slightly above the flange portion 28 on the side wall 22b (see FIG. 2) and the side wall 22d (see FIG. 3) of the frame body 16. The lock claw 32 is formed to protrude outward from the frame body 16. The lock claws 32 are formed at an appropriate interval in the circumferential direction of the frame body 16, and two are formed on the side wall 22 b and three on the side wall 22 d of the frame body 16.

  The printed circuit board 18 is assembled to the side wall 22d (see FIG. 3) of the frame body 16 as described above. The printed circuit board 18 is in the shape of a rectangular plate that extends over substantially the entire back surface of the frame body 16. As shown in FIG. 1, the printed circuit board 18 is provided with a plurality of fuse terminals 38 connected to fuses (not shown) and a plurality of connector terminals 40 connected to connectors (not shown). The fuse terminal 38 and the connector terminal 40 have an L-shaped bent shape. A plurality of relays 42 are provided in the central portion of the printed circuit board 18.

  The printed circuit board 18 is assembled to the frame body 16 by, for example, providing a relay 42 in a state where the fuse terminal 38 and the connector terminal 40 are inserted in advance into the fuse terminal insertion hole and connector mounting portion 24 (not shown) of the frame body 16. The printed board 18 is overlapped with the side wall 22d of the frame body 16. As shown in FIG. 3, a notch 44 is formed on the periphery of the printed circuit board 18, and the positioning projection 46 provided on the frame body 16 enters the notch 44, so that the printed circuit board 18 is formed on the frame body 16. It is positioned with respect to it. As a result, the fuse terminal 38 and the connector terminal 40 are respectively inserted into the corresponding through holes of the printed board 18. Then, after the printed circuit board 18 is fixed to the frame body 16 by a plurality of (in this embodiment, three) bolts 48, the fuse terminal 38 and the connector terminal 40 are fixed to the printed circuit board 18 with solder. In this way, the main body 12 is configured.

  Next, the bottom view of the main-body part 12 is shown in FIG. The bottom surface of the main body portion 12 is constituted by a lower surface 25 of the frame body 16, and a plurality of connector mounting portions 24 to which various connectors (not shown) are mounted are opened. A plurality of connector terminals 40 are inserted and protruded from the bottom surface of each connector mounting portion 24, and the connector provided at the wire terminal mounted on the connector mounting portion 24 is electrically connected to the printed circuit board 18. To be connected to.

  As is clear from FIG. 4, in the connector mounting portion 24 constituting the lower component mounting portion 26, the peripheral wall 52 protruding downward from the lower surface 25 of the frame 16 is connected between the adjacent connector mounting portions 24, 24. It is provided over the entire circumference so as to surround the entire circumference of the lower component mounting portion 26 as a whole. Further, a rectangular / cylindrical waterproof wall 56 projects from the lower surface 25 of the frame 16 so as to surround the entire circumference of the peripheral wall 52 of the lower component mounting portion 26. As is clear from FIG. 6, the waterproof wall 56 is provided to be inclined obliquely outward from the periphery of the lower component mounting portion 26.

  More specifically, as shown in FIG. 6, the peripheral wall 52 of the lower component mounting portion 26 protrudes downward with an angle substantially orthogonal to the lower surface 25 of the frame body 16. On the other hand, the waterproof wall 56 provided around the peripheral wall 52 of the lower component mounting portion 26 protrudes obliquely outward with respect to the lower surface 25 of the frame body 16. As a result, the angle α formed between the peripheral wall 52 of the lower part mounting portion 26 and the outer peripheral surface 60 of the waterproof wall 56 is set in a range of 0 ° <α <90 °. In addition, the angle β formed by the outer peripheral surface 60 of the waterproof wall 56 and the lower surface 58 of the flange portion 28 is set to an acute angle by the inclination of the waterproof wall 56 obliquely outward. Further, an angle γ formed between the outer peripheral surface 60 of the waterproof wall 56 and the protruding end surface 62 is also an acute angle.

  Further, the protruding end portion 64 of the waterproof wall 56 is formed so as not to protrude downward beyond the lowermost part of the peripheral wall 52 of the lower component mounting portion 26, that is, the lower component mounting portion 26, and the cover 14, that is, the cover 14. Are formed so as not to protrude outward in the width direction beyond peripheral walls 70b and 70d described later.

  The cover 14 that is externally inserted into the main body 12 is an integrally molded product made of synthetic resin. As shown in FIG. 1, the cover 14 has a long rectangular box shape that opens downward. On the upper surface of the cover 14, a plurality of fuse mounting portions 66 are formed in a line over substantially half of the longitudinal direction of the upper surface of the cover 14. Each fuse mounting portion 66 is formed with a pair of terminal insertion holes 68, 68 passing through the upper surface of the cover 14 so as to face each other.

  As is clear from FIG. 1, a rectangular lock hole 72 that penetrates the cover 14 is formed at the lower end of the peripheral wall 70 b of the cover 14 at a position corresponding to the lock claw 32 of the main body 12. In the present embodiment, in the cover 14, two lock holes 72 are formed in the peripheral wall 70 b that overlaps the side wall 22 b in the frame 16 of the main body 12. Similarly, although not shown, three lock holes 72 are formed in the peripheral wall 70 b overlapping the side wall 22 d of the main body 12 frame 16.

  Then, as shown in FIG. 1, the cover 14 is externally attached to the main body portion 12 from above. The amount of extrapolation of the cover 14 to the main body 12 is defined by the peripheral wall end surface 74 of the cover 14 being held in contact with the flange portion 28 of the main body 12. And the cover 14 is fixed to the main-body part 12 when the some locking hole 72 provided in the surrounding wall 70b etc. of the cover 14 each engages with the corresponding lock claw 32 of the main-body part 12. FIG. As a result, as shown in FIG. 5, the main body portion 12 and the cover 14 are assembled to each other in a state where the portion above the flange portion 28 of the main body portion 12 is accommodated in the cover 14, thereby forming the electrical connection box 10. Has been. A plurality of fuse terminals 38 (see FIG. 1 and the like) provided in the main body 12 are disposed in a fuse mounting portion 66 provided in the cover 14.

  In the electrical junction box 10 having such a structure, a fuse (not shown) is attached to each fuse attachment portion 66. The electrical connection box 10 is accommodated in another electrical connection box (not shown) such as a relay box and fixed via external locks 76 and 76 provided on the cover 14.

  In the electrical junction box 10 having the structure according to the present embodiment, as shown in FIG. 6, the waterproof wall 56 protruding from the periphery of the peripheral wall 52 of the lower part mounting portion 26 is inclined downward and obliquely outward. Is formed to protrude. Thereby, a large separation distance can be ensured between the opening end portion (lower end edge) 78 of the lower component mounting portion 26 and the protruding end portion 64 of the waterproof wall 56. Therefore, a large space is secured around the lower component mounting portion 26, and the work of attaching and detaching the electrical component to the lower component mounting portion 26 is facilitated, thereby improving workability. Moreover, since the projecting end 64 of the waterproof wall 56 can be largely separated from the opening end 78 of the lower part mounting portion 26, the surface of the main body 12 or the cover 14 flows down to the projecting end 64 of the waterproof wall 56. The reached water can be detached from the main body portion 12 in a downward direction at a position away from the opening end portion 78 of the lower part mounting portion 26. As a result, the entry of water into the lower part mounting portion 26 can be advantageously prevented.

  The angle α formed between the outer surface of the main body 12 and the outer peripheral surface 60 of the waterproof wall 56 is preferably set within a range of 5 ° ≦ α ≦ 40 °, more preferably 10 ° ≦ α ≦ 30 °. . If α is less than 5 °, the waterproof wall 56 and the lower part mounting portion 26 project in a substantially parallel proximity and project downward, and the gap between them becomes too small to improve the ease of attaching and detaching the electrical parts. . On the other hand, if α exceeds 40 °, the space required for the installation of the waterproof wall 56 becomes too large to satisfy the demand for downsizing, and there is a concern about a decrease in waterproofness.

  Further, an angle β formed by the outer peripheral surface 60 of the waterproof wall 56 and the lower surface 58 of the flange portion 28 can be an acute angle. Thereby, the water that has flowed down the surface of the main body 12 or the cover 14 and has reached the base end of the waterproof wall 56 can be trapped in the gap of the acute angle portion using the surface tension of the water. Therefore, the trapped water can be guided to the drainage region by connecting the contact acute angle portion to the drainage region (not shown).

  In addition, the outer peripheral surface 60 of the waterproof wall 56 is inclined obliquely outward and extends downward, and the projecting end surface 62 of the waterproof wall 56 is inclined obliquely upward from the outer peripheral side toward the inner peripheral side. It is said that. That is, the angle γ between the outer peripheral surface 60 of the waterproof wall 56 and the protruding end surface 62 is an acute angle. Accordingly, the water that reaches the protruding end surface 62 of the waterproof wall 56 along the outer peripheral surface 60 of the waterproof wall 56 is likely to flow downward at the protruding end portion 64 that has an acute angle. Accordingly, it is possible to advantageously prevent the water from reaching the inner peripheral surface of the waterproof wall 56. Thereby, it is possible to more advantageously prevent water from entering the lower part mounting portion 26. The angle γ between the outer peripheral surface 60 and the protruding end surface 62 of the waterproof wall 56 is preferably set in a range of 20 ° ≦ γ ≦ 50 °, more preferably 30 ° ≦ γ ≦ 40 °. If γ is less than 20 °, the thickness of the waterproof wall 56 cannot be ensured and the durability may be reduced. On the other hand, if γ exceeds 50 °, water may travel to the inner peripheral surface of the waterproof wall 56 along the protruding end surface 62 of the waterproof wall 56.

  Furthermore, the waterproof wall 56 is formed so as not to protrude downward beyond the lowermost part of the peripheral wall 52 of the lower part mounting portion 26, and outward in the width direction beyond the peripheral walls 70 b and 70 d of the cover 14. It is formed so as not to protrude. Thereby, the increase in the size of the electrical junction box 10 due to the provision of the waterproof wall 56 can be advantageously prevented.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. The waterproof wall 56 is preferably formed continuously over the entire circumference of the lower part mounting portion 26, but there is a possibility that water flowing down the surface of the main body 12 or the cover 14 will pass through in relation to other members. It may be divided at any location in the circumferential direction such as no or low.

  Further, a plurality of waterproof walls 56 projecting around the lower part mounting portion 26 may be provided, and the downward projecting angles thereof are arbitrarily set in consideration of individual circumstances from the viewpoint of drainage and waterproofness. Is possible. In the illustrated embodiment, the peripheral walls 52 of adjacent connector mounting portions 24 are connected and integrated. However, a single peripheral wall 52 is provided for each connector mounting portion 24, and the peripheral walls of each connector mounting portion 24 are further provided. Separate waterproof walls 56 may be provided around 52.

10: Electrical junction box, 12: Main body (case), 18: Printed circuit board (internal circuit), 26: Lower component mounting part, 56: Waterproof wall, 60: Outer peripheral surface, 62: Projection end surface

Claims (2)

In the electrical junction box provided with a lower part mounting part in which an internal circuit is housed in the case and an electrical part connected to the internal circuit is formed in the lower surface of the case and is opened,
An electrical junction box, characterized in that a waterproof wall is provided which inclines obliquely outward from the periphery of the lower component mounting portion and protrudes downward.   The electrical junction box according to claim 1, wherein an angle formed between the outer peripheral surface of the waterproof wall and the protruding end surface is an acute angle.

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