JP2006006079A - Electrical junction box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of floating of a relay caused by soldering without bending a lead of the relay, when the relay and a connector are mounted to a circuit board in an electrical junction box having a circuit board to which the relay and the connector are mounted. <P>SOLUTION: The relay 1 is arranged beneath the connector 2. A protrusion 7 for suppressing the floating of the relay 1 from the circuit board 3 is formed on the lower face of a housing 2b of the connector 2. Consequently, the floating of the relay caused by soldering can be prevented, the area of the circuit board can be reduced, and miniaturization and cost reduction is achieved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric junction box for automobiles.

  2. Description of the Related Art Conventionally, an electrical connection box in which a connection circuit is configured by a printed circuit board, a relay, a connector, and the like are mounted on the printed circuit board and accommodated in a case is known (see Patent Document 1). In this type of conventional electric junction box, the relay 1 and the connector 2 are mounted at different positions on the circuit board 3 as shown in FIG.

JP 2000-224736 A

  In order to mount a relay, a connector, or the like on a circuit board, the lead of each component is inserted into the through hole of the circuit board and soldered in a flow solder bath. However, at the time of this flow soldering, the relay may be lifted by molten solder, and the relay may drop off from the circuit board or a soldering failure may occur. In order to prevent this, conventionally, as shown in FIG. 6, after the lead 1a of the relay 1 is inserted into the through hole of the circuit board 3, it is bent at the lower surface of the circuit board 3 so that the relay does not float from the circuit board. ing. However, the lead bending work is troublesome and reduces the production efficiency of the electrical junction box.

  An object of the present invention is to provide an electrical junction box that does not require bending of relay leads when a relay or connector is mounted on a circuit board.

  One solution of the present invention is that, in an electrical junction box having a circuit board on which a relay and a connector are mounted, the relay is disposed under the connector, and the floating of the relay from the circuit board is suppressed by the connector housing. It is characterized by.

  The electrical junction box is preferably formed by forming a protrusion on the lower surface of the connector housing to prevent the relay from lifting from the circuit board.

  According to another solution of the present invention, in an electrical junction box having a circuit board on which a relay and a connector are mounted, the relay is disposed under the connector and a collector / heat sink is provided so as to contact the upper surface of the relay. The collector / heat radiating plate is fixed to the circuit board.

  In the electrical junction box, it is preferable that the circuit board has a metal core, and the current collector / heat sink is in thermal communication with the metal core of the circuit board.

  According to the present invention, the relay is arranged under the connector and the housing of the connector suppresses the floating of the relay from the circuit board. Therefore, the relay can be prevented from being lifted during soldering, and the relay lead can be bent. The process can be omitted. Moreover, since the relay and the connector are mounted in the same position on the circuit board, the required area of the circuit board can be reduced, and the electrical connection box can be reduced in size and cost.

  By the way, since the relay is a heat generating component, if the housing of the connector is brought into contact with or close to the upper surface of the relay, the heat dissipation may be lowered. In order to avoid this, it is preferable to form a protrusion on the lower surface of the connector housing so as to suppress the floating of the relay with this protrusion. In this way, the region other than the protrusions on the lower surface of the connector housing can be sufficiently separated from the upper surface of the relay, so that the heat dissipation can be reduced less.

  According to the present invention, the relay also floats from the circuit board during soldering by placing the relay under the connector and bringing the current collector / heat sink fixed to the circuit board into contact with the upper surface of the relay. Can be suppressed. Use of the collector / heat sink is also effective in improving the heat dissipation of the relay disposed in the narrow space under the connector.

  Also, when a metal core circuit board with good heat dissipation is used as the circuit board of the electrical junction box, higher heat dissipation is ensured by thermally connecting the collector / heat sink to the metal core of the circuit board. can do.

Embodiment 1 FIGS. 1 to 3 show an embodiment of the present invention. In the figure, 3 is a circuit board, and a fuse connector 2, an ECU (electronic control unit) connector 4, and connectors 5 and 6 to which a wire harness and the like are connected are mounted on the periphery of the circuit board 3. Has been. The fuse connector 2 is installed so as to have a space between the circuit board 3 and the relay 1 is disposed under the connector 2 and mounted on the circuit board 3.

  The connector 2 includes, for example, a tuning fork-shaped terminal 2a to which a fuse is connected, a housing 2b that supports the terminal 2a in a predetermined arrangement, and a lead 2c that has a tip portion inserted into a through hole of the circuit board 3 and soldered. have. As shown in FIG. 3, a protrusion 7 is formed on the lower surface of the housing 2 b, and the protrusion 7 suppresses the lifting of the relay 1 from the circuit board 3.

  With such a configuration, when the relay 1, the connectors 2, 5, 6, and other electronic components 8 are placed on the circuit board 3 and soldered, the relay 1 is prevented from floating from the circuit board 3. As a result, it is possible to reliably prevent the relay 1 from falling off or poor soldering. Moreover, since the process of bending the lead 1a of the relay 1 can be eliminated, productivity is improved. Furthermore, since the relay 1 is mounted under the connector 2, the area of the circuit board 3 can be reduced and the size can be reduced as compared with the case where the relay and the connector are mounted in different places.

  The component-mounted circuit board assembled as shown in FIG. 1 is housed in a case (not shown) (consisting of a lower case and an upper case) to form an electrical junction box.

  Incidentally, the protrusion 7 formed on the lower surface of the housing 2b is preferably formed so as to contact the upper surface of the relay 1 as shown in FIG. May be. This is due to the following reason.

  In general, the length of a lead of a through-hole type board mounted component such as a relay is set to about 3.5 mm considering that the thickness of the circuit board is 1.6 mm to 2.0 mm. This is because, since electrical and mechanical connections are made by soldering, the lead allowance from the lower surface (solder side) of the circuit board is required to be about 1 mm or more. In the configuration of this embodiment, for example, when a circuit board having a thickness of 1.6 mm is used and the protrusion 7 is formed so as to have a gap of 0.4 mm between the upper surface of the relay 1, the relay 1 is Even if it floats up, it can be suppressed to 0.4 mm or less, and a lead allowance of 1.0 mm from the bottom surface of the board necessary for solder connection can be secured.

Embodiment 2 FIGS. 4 and 5 show another embodiment of the present invention. In this electrical connection box, the relay 1 is mounted under the fuse connector 2, but in this embodiment, the collector / heat sink 9 is disposed so as to contact the upper surface of the relay 1, and this collector / The heat sink 9 suppresses the floating of the relay 1. The collector / heat sink 9 is bent downward on the back side of the relay 1, and the lower end thereof is fixed to the circuit board 3.

Since the circuit board 3 for the electrical junction box has a heat radiating metal core, the lower end of the collector / heat radiating plate 9 can be connected to the metal core of the circuit board 3 by means such as screwing, welding or soldering. preferable. Thereby, the metal core of the circuit board 3 and the collector / heat sink 9 are thermally connected, and the heat of the relay 1 can be dissipated more efficiently.
Since the configuration and effects other than the above are the same as those of the first embodiment, the description thereof will be omitted.

The upper side perspective view showing one embodiment of the electric junction box concerning the present invention. The lower side perspective view which shows the principal part of the electrical-connection box of FIG. The side view which similarly shows the principal part. The lower side perspective view which shows the principal part of other embodiment of the electric junction box which concerns on this invention. The side view which similarly shows the principal part. The side view which shows the principal part of the conventional electrical junction box.

Explanation of symbols

1: Relay 1a: Lead 2: Connector 2a: Terminal 2b: Housing 2c: Lead 3: Circuit board 7: Protrusion 9: Collector / heat sink

Claims (4)

  An electrical junction box having a circuit board on which a relay and a connector are mounted, wherein the relay is disposed under the connector, and the floating of the relay from the circuit board is suppressed by a housing of the connector.   2. An electrical junction box according to claim 1, wherein a protrusion is formed on the lower surface of the connector housing to prevent the relay from lifting from the circuit board.   In an electrical junction box having a circuit board on which a relay and a connector are mounted, the relay is disposed under the connector, and a collector / heat sink is disposed so as to contact the upper surface of the relay. An electrical junction box fixed to the circuit board. 4. The electrical junction box according to claim 3, wherein the circuit board comprises a metal core, and the collector / heat sink is thermally connected to the metal core of the circuit board.

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