JP7112486B2 - electronic controller - Google Patents

Description

The present invention relates to electronic control units.

For example, Patent Literature 1 discloses a structure of a housing for an electronic device in which a heat dissipation component is exposed to the outside of the housing. This housing accommodates a plurality of printed circuit boards on which electronic components are mounted. The housing includes a wall board, a housing-side connector, a board-side connector, a heat sink, and a radiator.

The wall board constitutes one wall surface of the housing and has a slit penetrating to the outside of the housing. The housing-side connector is fixed inside the wall board and has a slit that communicates with and penetrates the slit. The board-side connector is fitted to a housing-side connector provided on one end side of the printed board. The heat sink contacts electronic components on the printed circuit board. The radiator is inserted through the slit from the outside of the housing, one end is in surface contact with the heat sink, and the other end protrudes outside the housing.

JP-A-8-255990

The housing of Patent Document 1 dissipates heat generated by electronic components from the radiator to the outside of the housing. This conventional structure requires at least two parts: a heat sink and a radiator.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an electronic control device capable of improving heat dissipation with a simple structure.

In order to solve the above problems, an electronic control device according to the present invention includes a bottomed cylindrical housing having an opening at one end, and a control board inserted into the housing from the opening. The housing has a slit that is inserted into a part of the heat sink attached to the control board housed in the housing to expose a part of the heat sink to the outside of the housing. formed.

ADVANTAGE OF THE INVENTION According to this invention, heat dissipation can be improved with a simple structure.

1 is an external perspective view of an electronic control unit according to a first embodiment; FIG. 1 is a perspective view of a housing according to a first embodiment; FIG. 1 is a perspective view of a printed circuit board according to a first embodiment; FIG. Sectional drawing of the electronic control unit which concerns on 1st Example. Sectional drawing of the electronic control unit which concerns on 2nd Example. Sectional drawing of the electronic control unit which concerns on 3rd Example.

Several embodiments will be described in detail with reference to the drawings. It should be noted that the examples described below do not limit the invention according to the claims, and that all of the elements described in the examples and their combinations are essential to the solution of the invention. is not limited.

FIG. 1 is an external perspective view of an electronic control unit according to the first embodiment.

The electronic control device of the present embodiment includes a housing 10 made of resin and a printed circuit board 20 (see FIG. 3) as an example of a "control board" housed in the housing 10. As shown in FIG. The housing 10 is formed in a bottomed tubular shape with one end serving as an opening 11 (see FIG. 2). A cover 12 is attached to the opening 11 . A window 13 for exposing the terminals of the connector 21 is provided in the center of the cover 12 . Plate-shaped fins 23 of a heat sink 22 to be described later are exposed at the center of the upper surface of the housing 10 .

FIG. 2 is a perspective view of the housing according to the first embodiment.

A pair of upper and lower rails 14 are provided on the left and right inner surfaces of the housing 10, respectively. The pair of rails 14 slide while sandwiching both side ends of the printed circuit board 20 to guide insertion and removal of the printed circuit board 20 with respect to the housing 10 .

A plurality of slits 15 extending in the front-rear direction are formed at equal intervals in the left-right direction in the center of the upper surface of the housing 10 . Each slit 15 exposes each fin 23 of the heat sink 22 accommodated in the housing 10 to the outside of the housing 10 .

Further, on the upper surface of the housing 10, a first protrusion 16, a slit 15, and a second protrusion 17 are formed in this order from the opening 11 side. The first protrusion 16 is formed on the upper surface of the housing 10 on the side of the opening 11 . The slit 15 is formed between the first protrusion 16 and the second protrusion 17 . The second protrusion 17 is formed on the opposite side of the opening 11 with the slit 15 on the upper surface of the housing 10 interposed therebetween. The first protrusion 16 and the second protrusion 17 protrude to the outside of the housing 10 beyond the heat sink 22 . Thereby, the first convex portion 16 and the second convex portion 17 can protect the front and rear of the heat sink 22 from impact due to dropping or the like. The first protrusion 16 and the second protrusion 17 may be flush with the heat sink 22 .

The slit 15 is formed from the inclined wall of the first protrusion 16 on the second protrusion 17 side to the front of the second protrusion 17 . 2, only a part of the slit 14 formed in the first projection 16 is illustrated (about half is omitted).

FIG. 3 is a perspective view of the control board according to the first embodiment.

A connector 21 and a CPU 24 as an example of an electronic component are mounted on the surface of the printed circuit board 20 . The connector 21 is arranged at one end of the printed circuit board 20 (the end on the opening 11 side). Connector 21 is connected to another connector. The CPU 24 is arranged in the center of the printed circuit board 20 .

A heat sink 22 is attached to the surface of the printed circuit board 20 . The heat sink 22 is attached to the printed circuit board 20 by means of adhesion, screws, or the like while in contact with the side of the CPU 24 opposite to the printed circuit board 20 . The heat sink 22 is made of a metal material such as aluminum. The heat sink 22 comprises a base and a plurality of fins 22 for heat dissipation. Fin 22 is formed in a plate shape. The fins 22 stand at the same intervals as the slits 14 from the base. The fins 22 are exposed outside the housing 10 when inserted into the slits 14 . The heat sink 22 conducts the heat of the CPU 24 from the base to the fins 22 and discharges it to the outside of the housing 10 .

FIG. 4 is a cross-sectional view of the electronic control unit according to the first embodiment. 4 shows a state before the cover 12 is attached to the housing 10. FIG.

Next, a procedure for housing the printed circuit board 20 in the housing 10 will be described. The operator inserts the printed circuit board 20 on which the connector 21 and the CPU 24 requiring heat dissipation are mounted in advance and the heat sink 22 is attached, into the housing 10 through the opening 11 of the housing 10 . When inserting the printed circuit board 20 into the housing 10 , the printed circuit board 20 is guided to be inserted into the housing 10 by sliding the printed circuit board 20 while sandwiching both ends thereof between the upper and lower rails 14 .

Further, when the printed board 20 is inserted into the housing 10 , the fins 23 of the heat sink 22 are inserted from the opening 11 side of the slit 15 , and the fins 23 projecting from the slit 15 are exposed to the outside of the housing 10 . After inserting the printed circuit board 20 into the housing 10 , the cover 12 is attached to the opening 11 of the housing 10 . Thereby, the terminals of the connector 21 are exposed to the outside of the housing 10 through the window 13 provided in the cover 12 (see FIG. 1).

According to this embodiment, the housing 10 has slits that are inserted into the fins 23 of the heat sink 22 attached to the printed circuit board 20 housed in the housing 10 to expose the fins 23 to the outside of the housing 10. 15 was formed. This makes it possible to expose the fins 13 of the heat sink 22 to the outside of the housing 10 with the simple structure of the housing 10, thereby improving the heat dissipation. Therefore, no additional components for heat dissipation are required.

Furthermore, since the first convex portion 16 and the second convex portion 17 project more than the heat sink 22, the possibility that the heat sink 102 receives a direct impact due to a drop or the like can be reduced.

A second embodiment will be described with reference to FIG. In each of the following embodiments, including the present embodiment, differences from the first embodiment will be mainly described.

FIG. 5 is a cross-sectional view of the electronic control unit according to the second embodiment.

As shown in FIG. 5, the slit 15 may be closed by the fins 26 of the heat sink 25 by arranging the CPU 27 and the heat sink 25 up to the opening 11 side.

According to this configuration, it is possible to prevent water, sand, dust, and the like from entering from the outside to the inside of the housing 10 through the slits 15 .

A third embodiment will be described with reference to FIG.

FIG. 6 is a cross-sectional view of the electronic control unit according to the third embodiment.

As shown in FIG. 6 , the slit 15 and the first protrusion 16 may be formed on the upper surface of the housing 30 without forming the second protrusion 16 . That is, the first convex portion 16 is formed on the side of the opening 11 on the upper surface of the housing 30, and the side opposite to the opening 11 across the slit 15 on the upper surface of the housing 30 is lower than the heat sink 22. may be formed.

According to this configuration, the opening 11 side of the fins 23 of the heat sink 22 can be protected by the first convex portion 16 from an impact such as being dropped. becomes thinner, and the housing 30 can be miniaturized.

In addition, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations.

For example, in the above embodiments, the CPUs 24 and 27 may be semiconductor devices that generate a large amount of heat other than the CPUs 24 and 27. FIG.

DESCRIPTION OF SYMBOLS 10... Housing 11... Opening 14... Rail 15... Slit 16... First convex part 17... Second convex part 20... Printed circuit board 21... Connector 22... Heat sink 23... Fin 24 ...CPU, 25...Heat sink, 26...Fin, 27...CPU, 30...Housing

Claims (7)

An electronic control device comprising a bottomed cylindrical housing with an opening at one end and a control board inserted into the housing from the opening,
forming a slit in the housing that is inserted into a portion of a heat sink attached to the control board housed in the housing to expose a portion of the heat sink to the outside of the housing ;
forming a first convex portion protruding to the outside of the housing from the heat sink on the opening side of the housing;
The slit is formed on the inclined surface of the first protrusion ,
electronic controller. A second convex portion protruding outside the housing from the heat sink is formed on the side opposite to the opening side across the slit of the housing,
The electronic control unit according to claim 1 . Electronic components are mounted on the control board,
The heat sink is attached to the control board in contact with the electronic component,
The electronic control unit according to claim 1. A connector is mounted on the control board,
Terminals of the connector are exposed from the openings,
The electronic control unit according to claim 1. the heat sink comprises a plurality of fins,
The electronic control unit according to claim 1. The slit is closed by the heat sink when the control board is inserted into the housing.
The electronic control unit according to claim 1. The housing is provided with rails for guiding the insertion and removal of the control board into and out of the housing,
The electronic control unit according to claim 1.

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