JPH0317551Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The invention relates to a wiring connection device for attaching various electronic units and electrical equipment in automobiles, etc., and also for completing connections to each device using a wire harness. It is.

Prior Art A power distribution box is configured by arranging a conductor to communicate between the terminals of these connectors inside an electrically insulating case in which a plurality of connectors are provided on the outer wall. It is well known to connect connector terminals of electronic units and electrical equipment directly or through a wire harness or the like to complete mutual wiring connections at once. In addition, individual relays and fuses that are directly connected to the connectors of power distribution boxes are generally small and there are no particular problems when installing them, but various electronic units have functional components mounted on a wiring board and covered with a top cover. Since the circuit board is mounted on the distribution box with the wiring board in contact with it, the heat generated in the distribution box is easily transferred to the electronic unit, and the problem is that it is easy to accumulate and become high temperature. .

In order to prevent the temperature of the electronic unit from rising, it is possible to incorporate a structure that facilitates heat dissipation. Heat radiation hole c
There are examples where . An example of the conventional technology in which an electronic unit provided with such heat dissipation holes is mounted on a distribution box is shown in Fig. 4.
houses the wiring board 12 inside the cover 13,
It is installed in an electronic unit housing recess 4 provided on the cover 1 of the distribution box A. A plurality of heat radiation holes 8 are provided in the cover 13 of the electronic unit B, and the functional components 1 mounted on the wiring board 12 are provided with a plurality of heat radiation holes 8.
Although it is designed to prevent the temperature of switch 1 from rising excessively, heat transfer from distribution box A cannot be avoided, and foreign objects may enter through heat radiation holes 8 and cause malfunctions. I was worried.

Problems to be Solved The present invention provides a wiring connection device on which an electronic unit is mounted, which has a structure that effectively prevents the temperature of the electronic unit mounted on the distribution box from rising and prevents foreign matter from entering the inside. This is what I am trying to do.

Means for Solving Problems The purpose of the present invention as described above is to provide a space through which air can flow between the cover surface of the distribution box and the bottom surface of the case cover of the electronic unit, and to create a heat dissipation system that allows air to flow in and out of this space. This is achieved by forming a wiring connection device by providing holes. That is, the wiring connection device in which the electronic unit of the present invention is mounted has a conductor disposed within an electrically insulating cover, and the electronic unit is mounted and connected on a distribution box provided with a plurality of connectors. At least one of the distribution box and the electronic unit is provided with a holding means capable of keeping the distribution box cover surface and the bottom surface of the electronic unit case cover apart, and the distribution box cover and the bottom surface of the electronic unit case cover are separated from each other. The space formed between them is open to the outside of the wiring connection device.

Embodiment FIG. 1 is a diagram illustrating an example of the device of the present invention, where A is a distribution box and B is an electronic unit to be mounted on the distribution box A. Note that B' is a view of electronic unit B from the back side.

1 is the cover of the distribution box A, 2 is the connector housing connected to the terminal connector C of the wire harness,
Reference numeral 3 designates a connector housing to which devices such as relays are mounted and connected; 4 a housing portion for the electronic unit B; and 5 a frame surrounding the housing portion 4 and regulating the mounting position of the electronic unit B. A conductive busbar 6 is disposed inside the distribution box A, and its ends rise to terminals 7, 7'.
is formed. A row of terminals 7 for connection to the electronic unit B are protruded through the bottom surface of the accommodating portion 4. At the base of the frame 5, there are heat radiation holes 8 on both left and right sides so as to communicate between the inside and outside of the frame 5.
is provided. Numeral 9 is a lock hole for electronic unit B, and numerals 10 and 10 are fixing stands.

On the other hand, the electronic unit B houses a wiring board 12 on which various functional components 11 are attached inside a front cover 13 and a back cover 14, and a connector 15 corresponding to the terminal 7 is located on the bottom of the back cover 14. is formed. The front cover 13 is formed to be slightly larger than the back cover 14, and the end of the front cover 13 forms a stepped portion 16 with respect to the back cover 14. 17 is a lock pawl, and 18 is a fixing flange.

When installing the power distribution box A and the electronic unit B having such a configuration, the stepped portion 16 of the cover of the electronic unit B is supported by coming into contact with the upper end of the frame 5, and the lock pawl 17 is locked into the lock hole 9. be done. At this time, the height of the frame 5 is set so that a space S remains between the top surface of the mounting portion 4 and the bottom surface of the back cover 14 of the electronic unit B. In this state, the fixing flange 18 is screwed to the fixing base 10 to complete the installation of the electronic unit B to the distribution box A, but the heat radiation hole 8 communicates with the space S to ensure ventilation ( Figure 2).

In the device assembled in this way, the heat generated inside the distribution box A increases the temperature of the cover 1 through conduction, but since there is a space S between the distribution box A and the electronic unit B, direct heat conduction occurs. doesn't happen. Then, the air heated on the surface of the cover 1 is transferred to the heat radiation hole 8
Particularly when the device is positioned so that the heat radiation holes 8 and 8 are located above and below, air convection is promoted, making it even more difficult for the temperature of the electronic unit B to rise.

Effects of the Invention As detailed above, in the wiring connection device equipped with an electronic unit according to the present invention, the electronic unit is less affected by the heat generated in the distribution box.
Furthermore, it has become possible to seal the electronic unit, preventing the intrusion of foreign matter, and eliminating the causes of functional deterioration of the electronic unit.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view illustrating the configuration of a wiring connection device on which an electronic unit according to the present invention is mounted, and FIG. 2 is a partially sectional view of the same assembled device. FIG. 3 is a perspective view showing the structure of a known electronic unit, and FIG. 4 is a perspective view showing the structure of a wiring connection device equipped with a conventional electronic unit. A... Distribution box, B... Electronic unit, C... Wire harness terminal connector, 1... Cover, 4...
...Electronic unit mounting part, 5...frame, 7...terminal,
8... Heat radiation hole, 9... Lock hole, 13... Front cover, 14... Back cover, 15... Connector, 16
...Dan section, 17...Lock claw, S...Space.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A wiring connection device comprising an electrically insulating cover disposed with a conductor and an electronic unit mounted and connected on a distribution box provided with a plurality of connectors, which At least one of the distribution box and the electronic unit is provided with a holding means capable of keeping the distribution box cover surface and the bottom surface of the electronic unit case cover apart, and is formed between the distribution box cover surface and the bottom surface of the electronic unit case cover. A wiring connection device equipped with an electronic unit, characterized in that a space opened to the outside of the wiring connection device. (2) The device according to claim 1, in which the electronic unit houses a wiring board on which functional components are attached in a case cover that has no openings other than connection terminal insertion holes. .