JP2010283985A - Electrical junction box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical junction box which can avoid the adhesion of water infiltrating a case to a circuit constitution body. <P>SOLUTION: In the electrical junction box 1, there are arranged two circuit constitution bodies 10, 20, a casing 30 for accommodating the circuit constituting bodies 10, 20, and a connector 40 which is assembled to the casing 30, and has a hood 41 which can be engaged with an external connector. A draw hole 45, which is penetratingly formed accompanied by the drawing of a metal mold for molding is formed at the hood 41 of the connector 40. In the casing 30, a water shutoff wall 39 for partitioning the clearance between the draw hole 45 and the first circuit constitution body 10 arranged in the nearest vicinity of an opening position of the draw hole 45 out of a plurality of the circuit constitution bodies 10, 20 is formed. According to such a constitution, the water intruding through the draw hole 45 is blocked by the water shutoff wall 39, and the water does not reach the first circuit constitution body 10. As a result, short-circuiting due to water component adhering to the circuit constitution body 10 can be avoided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electrical junction box.

  In order to distribute power from the on-board power supply to various electrical components, the electrical connection box disposed in the engine room of the automobile is a circuit board on which a conductive path is formed, and switching arranged on the surface side of the circuit board. A circuit structure including a member is accommodated in a resin case.

Utility Model Registration No. 2571889

  This type of electrical junction box is generally provided with a connector portion for connection with an external connector. The connector portion is provided with a cylindrical hood portion, and an external connector can be fitted inside the hood portion.

  In such a connector portion, a lock claw for engagement with an external connector is provided inside the hood portion. For this reason, a die hole for forming a lock claw at the time of molding the connector portion is opened at the upper portion of the hood portion. In such a configuration, there is a possibility that water that has entered the inside of the connector portion enters the case through the hole. When the invading water adheres to the circuit structure, there is a concern that the circuit formed on the circuit board is short-circuited.

  To avoid this situation, apply grease to the inner surface of the hood and the outer surface of the mating connector to prevent water from entering through the gap between the hood and the mating connector. Countermeasures have been taken. However, there is a concern that the water stop performance cannot be maintained due to the deterioration of the grease when the usage period of the automobile becomes long.

  This invention is completed based on the above situations, Comprising: It aims at providing the electrical junction box which can avoid that the water which penetrate | invaded in the case adheres to a circuit structure.

  An electrical junction box according to the present invention includes a circuit board on which a conductive path is formed, a plurality of circuit components including a switching element mounted on the circuit board, and a casing that houses the circuit components, A connector portion having a hood portion that is assembled to the casing and can be fitted to an external connector, and the hood portion is formed with a punched hole that is formed as a die for molding is punched. A connector portion, and the casing is provided with a stopper for partitioning between the hole and a circuit component disposed closest to an opening position of the hole among the plurality of circuit components. A water wall is provided.

  According to such a configuration, water that has entered through the hole is blocked by the water blocking wall and does not reach the circuit structure. Thereby, it can avoid that a water | moisture content adheres to a circuit structure and raise | generates a short circuit.

  As the embodiments of the present invention, the following embodiments are preferable.

  The water blocking wall may be arranged along a wall portion in which a hole is opened in the connector portion in a state where the connector portion is assembled. According to such a configuration, the water blocking wall is in a state of closing the opening of the hole, so that the water blocking function for blocking water entering through the hole is more reliably exhibited.

  According to the present invention, the water that has entered through the hole is blocked by the water blocking wall and does not reach the circuit structure. Thereby, it can avoid that a water | moisture content adheres to a circuit structure and raise | generates a short circuit.

The perspective view of the electric junction box in an embodiment Front view of electrical junction box in embodiment Top view of electrical junction box in embodiment Bottom view of electrical junction box in embodiment Side view of electrical junction box in embodiment AA sectional view of FIG. The perspective view of the lower case in an embodiment

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to FIGS. The electrical junction box 1 of the present embodiment is used as a power distributor that controls power supply to each electronic device via a power source such as an in-vehicle battery and a load such as each electronic device, for example. It is. The electrical junction box 1 includes two circuit components 10 and 20 that are accommodated in parallel at a distance from each other in a vertical posture, and a casing 30 that accommodates these circuit components 10 and 20. It has been.

  Each of the two circuit components 10 and 20 has a rectangular shape as a whole. Although not shown in detail in these circuit components 10 and 20, a printed circuit board having a predetermined conductive path formed on the surface, and mounting components such as a semiconductor switching element S mounted on the surface of the printed circuit board, Is provided.

The casing 30 is made of a synthetic resin and includes a lower case 31 and an upper cover 32 that is assembled to the lower case. The lower case 31 as a whole has a rectangular box shape with an open front surface. On the other hand, the upper cover 32 as a whole has a rectangular box shape with an open rear surface, and is assembled to the lower case 31 so as to close the opening on the front surface. A plurality of locking projections 33 are provided on the outer surface of the side wall of the lower case 31, and locking pieces 34 are provided at positions corresponding to the locking projections 33 of the lower case 31 in the upper cover 32. And the lower case 31 and the upper cover 32 are assembled so as not to be separated from each other by the engagement of the engagement protrusion 33 and the engagement piece 34.
On the inner side surface of the rear wall 35 of the lower case 31, there are a plurality of first leg portions 36 formed with a low profile and a plurality of second leg portions 37 formed with a height higher than the first leg segment 36. , Each projecting forward.

  Inside the casing 30, the first circuit component 10 is accommodated in a state of being placed on the first leg portion 36 of the lower case 31, and is fixed to the first leg portion 36 by screws. On the other hand, the second circuit configuration body 20 is accommodated in a state of being placed on the second leg portion 37 and fixed to the second leg portion 37 by screws. Thus, the first circuit component 10 is supported in a vertical posture at a position slightly spaced forward from the inner surface of the rear wall of the lower case 31. Further, the second circuit configuration body 20 is supported in a vertical posture at a position slightly forward (on the upper cover 32 side) from the first circuit configuration body 10.

Cutouts are provided in the bottom wall portions of the lower case 31 and the upper cover 32, respectively, and the cutouts form two connector mounting ports 38 in a state where both are assembled into a casing 30. A connector portion 40 that can be fitted to an external connector (not shown) can be attached to the connector attachment port 38.
The inner surface of the rear wall of the lower case 31 is deeper by the height of the connector portion 40 than one of the two connector mounting ports 38 (the right side in FIG. 1) (in other words, the connector mounting port 38A). At a position (above the height of the connector portion 40), there is provided a water blocking wall 39 protruding forward over the entire width direction of the connector mounting opening 38A.

  The connector portion 40 attached to the connector mounting port 38 is formed in a horizontally long block shape that extends along the width direction of the casing 30 with synthetic resin. The connector portion 40 is provided with a plurality of cylindrical hood portions 41 opened downward, and an external connector can be fitted therein. The connector part 40 is accommodated in the casing 30 such that the opening of the hood part 41 faces outward from the connector mounting port 38 of the casing 30. Inside the hood 41, one end of a terminal 42 bent into an L shape protrudes through the back wall. The other end of the terminal 42 is inserted into the through holes 11 and 21 opened in the circuit components 10 and 20 and fixed by soldering.

  In a state where the connector part 40 is attached to the casing 30, the first circuit component 10 is located above the ceiling wall 44 of the hood part 41. On the other hand, the second circuit configuration body 20 is positioned in front of the hood portion 41, and a lower end portion thereof is suspended in front of the hood portion 41.

  A lock claw 43 for engaging with an external connector is formed inside the hood portion 41. Therefore, the lock claw 43 is formed on the ceiling wall 44 of the hood portion 41 when the connector portion 40 is molded. A die hole 45 for forming is formed through. Here, as described above, the casing 30 is provided with the water blocking wall 39, and when the connector portion 40 is attached to the casing 30, the water blocking wall 39 is arranged at a position along the ceiling wall 44 of the hood portion 41. The The protruding length of the water blocking wall 39 is a length that can completely cover the opening of the punched hole 45 in a state where the connector portion 40 is mounted on the casing 30. Thereby, the water blocking wall 39 partitions between the opening of the hole 45 in the connector part 40 and the first circuit component 10, and closes the hole 45 from above.

  In the electrical junction box 1 configured as described above, when the connector portion 40 is molded, the die hole 45 for forming the lock claw 43 for engaging with the external connector is formed inside the hood portion 41. It will be opened in the ceiling wall 44 of the hood part 41. In addition, the first circuit configuration body 10 of the two circuit configuration bodies 10 and 20 is disposed on the upper side of the connector portion 40, and the lower end edge thereof is positioned in the vicinity of the punch hole 45. For this reason, when water that has entered the inside of the connector portion 40 enters the inside of the casing 30 through the hole 45 and adheres to the first circuit component 10, a circuit formed on the first circuit component 10 is formed. There is concern about short circuits.

  However, in this embodiment, the water stop wall 39 is provided in the casing 30, and the hole 45 and the first circuit component 10 are partitioned. According to such a configuration, the water that has entered through the hole 45 is blocked by the water blocking wall 39 and does not reach the first circuit component 10. Thereby, it can avoid that a water | moisture content adheres to the circuit structure 10 and raise | generates a short circuit.

  Here, if only one circuit component is accommodated in the casing 30, for example, the circuit component is accommodated away from the opening of the punched hole in the connector portion, or the casing 30 is closed in the casing. It is also possible to avoid water from reaching the circuit structure by means such as filling the ting material and covering the circuit structure. However, in the case where the plurality of circuit components 10 and 20 are accommodated in the casing 30 as in the present embodiment, an increase in the size of the electrical connection box and the degree of design freedom can be achieved if the above measures are adopted. Inconvenience such as reduction occurs. On the other hand, in this embodiment, the simple structure of providing the water blocking wall 39 avoids the adhesion of moisture to the circuit component 10 while ensuring the compactness of the electrical connection box and the degree of design freedom. Can do.

  Further, the water blocking wall 39 is arranged along the ceiling wall 44 of the hood portion 41 in the connector portion 40 (the wall portion where the punched hole 45 opens), and closes the opening of the punched hole 45. . Thereby, the water stop function which blocks the water which penetrates through the punching hole 45 is more reliably exhibited.

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

(1) According to the above embodiment, the two circuit components 10 and 20 are accommodated in the casing 30, but three or more circuit components may be accommodated in the casing. .
(2) In the above embodiment, the water blocking wall 39 corresponding to one connector portion 40 (right side in FIG. 1) of the connector portions attached to the casing 30 has been described as an example. A water blocking wall may also be provided at a position corresponding to the connector portion 40 on the left side).

DESCRIPTION OF SYMBOLS 1 ... Electric junction box 10, 20 ... Circuit structure 30 ... Casing 41 ... Hood part 40 ... Connector part 45 ... Punch hole 39 ... Water blocking wall

Claims (2)

A plurality of circuit components including a circuit board on which a conductive path is formed; a switching element mounted on the circuit board; and a plurality of circuit elements including a switching element mounted on the circuit board;
A casing that houses the plurality of circuit components;
A connector portion that includes a hood portion that can be fitted with an external connector, and is assembled to the casing, and the hood portion has a punch hole that is formed through when the mold is punched during molding. A connector part,
The casing has a water blocking wall that partitions between the opening of the hole in the connector portion and a circuit structure disposed closest to the opening position of the hole among the plurality of circuit structures. An electrical junction box is provided.   The electrical junction box according to claim 1, wherein the water blocking wall is arranged along a wall portion in which a hole is opened in the connector portion in a state where the connector portion is assembled to the casing.

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