JP2001068874A - Electronic controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent contact interference with the case of electronic parts mounted on a printed board, when storing the printed board in a case. SOLUTION: The opening 11 of a case 10, which comes close to an electronic part 21 when a printed board 31 inclines in the direction of board thickenss to be inserted through the opposed slit grooves 13a and 13b at the inwall face 12 of a bag structure of case 10 in an ECU(electronic control unit) 100, is cut aslant. Therefore, when the tip of the printed board 31 is inserted through the slit grooves 13a and 13b to the side of the opening 11 of the case 10, the contact interference between the electronic parts 32 mounted on the printed board 21 and the opening 11 or the inwall face 12 of the case 10 is prevented. As a result, the fitting into the case 10 of the printed board 31 where a plurality of electronic parts are mounted can be made quickly without spoiling the reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic control device in which a printed circuit board on which a plurality of electronic components are mounted is housed in a case.

[0002]

2. Description of the Related Art Conventionally, as a prior art document related to an electronic control device in which a printed circuit board on which a plurality of electronic components are mounted is housed in a case, one disclosed in Japanese Patent Application Laid-Open No. 9-207691 is known. I have. In this case, an electronic control unit (electronic control circuit) is housed in an inner box part of a storage box (electro box) having a double structure of an inner box part and an outer box part, and the inner box part and the outer box part are stored. A technique for suppressing a rise in the temperature of an electronic control unit by flowing a cooling air through an air passage between the electronic control unit and the electronic control unit is disclosed. At this time, since the cooling air does not directly hit the electronic control unit, even if the cooling air contains dust, moisture, or the like, it is possible to eliminate the adverse effect on the electronic control unit.

[0003]

By the way, in order to store the electronic control unit in the inner box portion of the storage box, the inner dimensions of the inner box portion of the storage box, such as the width of the front wall and the distance between the inner wall surfaces, are determined by the outer shape of the electronic control unit. Since it needs to be set larger than the dimensions,
A predetermined gap exists between the electronic control unit and the inner box of the storage box. That is, there is an air layer between the electronic control unit and the inner box portion of the storage box, and a cooling effect cannot be obtained even when cooling air flows through the air path due to its high insulation property.
In particular, there has been a problem that a high heat-generating product cannot provide a sufficient cooling effect in accordance with the sophistication of the electronic control unit.

[0004] As a structure for coping with such a problem and ensuring the waterproofness of the electronic control device, a structure using a bag-shaped case is known. Here, when heat radiation from a plurality of electronic components mounted on the printed circuit board housed in the case of the electronic control device is required, the heat dissipation effect can be increased by using an aluminum alloy die-cast for the case having the bag structure. it can. In addition, in order to insert and accommodate a printed circuit board on which a plurality of electronic components are mounted in a case having a bag structure in a direction along the plane of the board, slit grooves are provided on inner wall surfaces of the case facing each other. A structure in which a printed board is inserted along is generally used.

In the case where the above-mentioned structure is adopted,
When a deep case is formed at the back side with a bag structure, a predetermined draft is required for the inner wall surface and the slit groove facing the case. For this reason, the bottom side of the inner wall surface of the case is narrow and the opening side is wide due to the inclination dimension based on the draft angle of the mold. Therefore, the printed circuit board is clamped and fixed by the slit groove on the bottom side of the inner wall surface of the case in a state where the assembly to the case is completed.

However, even if the printed circuit board is accommodated in the case through the slit groove, the printed circuit board is easily inclined due to a large margin with the slit groove on the opening side of the inner wall surface of the case, and is mounted on the printed circuit board. If the electronic component contacts and interferes with the opening or the inner wall surface of the case, damage or the like occurs. As a countermeasure, it is costly to insert a dedicated jig with high accuracy, and if no dedicated jig is used, careful attention must be paid to housing the printed circuit board in the case. And extra time is required.

Accordingly, the present invention has been made to solve such a problem. When a printed circuit board is inserted into and fixed to a case having a draft by a molding die, the electronic components mounted on the printed circuit board are placed on the case side. It is an object to provide an electronic control device that is not damaged by contact interference.

[0008]

According to the electronic control device of the first aspect, the case has a bag structure, and at least one wall surface of the opening is cut and formed. In other words, when the printed circuit board is inserted and accommodated in the case along the plane of the board, even if the printed circuit board is inclined in the thickness direction, the wall surface of the opening of the case close to the electronic components mounted on the printed circuit board is cut. The electronic components mounted on the printed circuit board are prevented from contacting with the opening or the inner wall surface of the case. As a result, the work of housing the printed circuit board on which the plurality of electronic components are mounted in the case can be quickly performed without impairing the reliability.

According to the electronic control device of the present invention, the opening of the case is cut obliquely toward the wall surface side of the case close to the electronic component mounted on the printed circuit board and is widened. Contact interference between the electronic component and the opening or the inner wall surface of the case is prevented. As a result, the work of housing the printed circuit board on which the plurality of electronic components are mounted in the case can be quickly performed without impairing the reliability.

According to the third aspect of the present invention, opposed slit grooves for guiding both side edges of the printed circuit board are formed on the inner wall surface of the case, and the printed circuit board is inserted in a direction along the plane of the board. The inclination in the thickness direction at the time of performing is regulated. For this reason, the contact operation between the electronic components mounted on the printed circuit board and the opening or the inner wall surface of the case is prevented, and the work of housing the printed circuit board on which the plurality of electronic components are mounted in the case is not impaired in reliability. It can be executed quickly.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples.

FIG. 1 is an external view showing an electronic control device to which an electronic control device according to an embodiment of the present invention is applied. Here, FIG. 1A is a front view, and FIG. 1B is a right side view of FIG. 1A. FIG. 2 is a cross-sectional view showing a configuration of a main part of the electronic control device of FIG. 1, and FIG. 3 is an exploded perspective view of the electronic control device of FIG. In this embodiment, for convenience of explanation, one of the electronic components mounted on the printed circuit board, which is closest to the case side during assembly, has a heat generation property fixed to a heat sink (heat radiating member) by screws. Only the external connection connector for connecting the electronic components provided and the electronic control circuit formed on the printed circuit board to the outside is shown.

1, 2 and 3, reference numeral 100 denotes an electronic control unit (Electronic Control Unit) as an electronic control device.
trol Unit; hereinafter, referred to as “ECU”).
Reference numeral 00 denotes an electronic component 32 or a printed circuit board 31 which is a vertical element such as a tall capacitor mounted on a printed circuit board 31 in a case 10 having a bag structure made of aluminum alloy die-casting.
And an electronic control circuit 30 including an electronic component 33 having heat generation and fixed to the heat sink 34 by screws.

An opening 11 is formed on an upper end surface of a case 10 of the ECU 100, and slit grooves 13a and 13b are formed on an inner wall surface 12 thereof so as to face each other. here,
Inner wall surface 12 of case 10 of ECU 100, slit groove 1
3a, 13b, and the like have an inclination dimension based on a draft angle at the time of molding when the material is solidified from a melted state in the molding die at the time of molding to be formed into a shape determined by the molding die. The printed circuit board 31 has an electronic control circuit 3
An external connection connector 35 for connecting the terminal 0 to the outside is fixed by soldering its terminal portion.

The printed circuit board 31 is restricted by the slit grooves 13a and 13b of the case 10 of the ECU 100,
To be housed. In the assembly completed state of the printed board 31, the lower end side (insertion tip side) of the printed board 31 is positioned by the slit grooves 13a and 13b. Here, the upper end side of the printed circuit board 31 is the opening 1 of the case 10.
The connector cover 20 is fixed to the plastic connector cover 20 that covers the periphery of the external connection connector 35 located on the first side with screws. When the printed circuit board 31 is completely inserted into the case 10, the connector cover 20 is fixed to the case 10 with screws. Then, the assembly of the ECU 100 is completed.

Next, the printed circuit board 31 in which the electronic control circuit 30 is formed is accommodated in the case 10 of the ECU 100 via the slit grooves 13a and 13b.
This will be described with reference to the cross-sectional view of FIG. Here, FIG. 4A shows an ECU 10 having an oblique cut shape at the opening 11 of the case 10 according to the present embodiment.
0, FIG. 4 (b) shows the opening 1 of the case 10 'for comparison.
FIG. 3 is a cross-sectional view of the ECU 100 ′ having a simple one-side cut shape in a direction perpendicular to the insertion direction of the printed circuit board 31 at 1 ′. In the comparative example shown in FIG. 4B, the same components or the same components as those of the embodiment shown in FIG. 4A are denoted by the same reference numerals and symbols, and detailed description thereof will be omitted. I do.

First, as shown in FIG. 4A, the front end of the printed circuit board 31 is made to face the entrances of the left and right slit grooves 13a and 13b of the case 10 of the ECU 100. Next, when the printed circuit board 31 is pushed in, the printed circuit board 31 is guided along the slit grooves 13a and 13b, and
0 case 10 is gradually accommodated in the back side. During the assembly, as shown in FIG. 4 (b), if the opening 11 'of the case 10' is not cut diagonally, EC
U100 'case 10' has slit grooves 13a ', 13
When the printed circuit board 31 on which the electronic control circuit 30 is configured is housed via the b ', the printed circuit board 31 is
If it is tilted in the thickness direction at the initial stage of insertion into the electronic component 32, the electronic component 32, which is a vertical element such as a capacitor, mounted on the tip side thereof will interfere with the opening 11 ′ and the inner wall surface 12 ′ of the case 10 ′. This will result in damage to the parts 32 and the like.

On the other hand, as shown in FIG.
In the case where the opening 11 of the case 10 is cut obliquely, the electronic component 32 which is a vertical element such as a capacitor mounted on the tip side of the printed circuit board 31 even if the printed board 31 is inclined in the thickness direction at the initial stage of insertion. Even when it is closest to the opening 11 and the inner wall surface 12 of the device 10, the electronic components 32 and the like will not be damaged without contact interference.

That is, in the case 10 of the ECU 100, when the printed circuit board 31 is inserted,
a, 13b, the gap dimension between the surface of the printed circuit board 31 and the edge on the inner wall surface 12 side of the opening 11 of the case 10 is larger than the top of the electronic component 32 even when inclined toward one side. Opening 1 of case 10 so as not to interfere
1 may be cut diagonally.

After the printed circuit board 31 is inserted into the slits 13a and 13b of the case 10 on the side of the opening 11, the printed circuit board 31 is securely guided and accommodated in the case 10 without coming off the slits 13a and 13b. In the assembly completed state of the printed board 31, as described above, the lower end of the printed board 31 is
The printed circuit board 31 is positioned and fixed by the connector cover 20 which covers the periphery of the external connection connector 35 positioned on the opening 11 side of the case 10.

As described above, the ECU 100 as the electronic control unit of the present embodiment has a printed circuit board 31 on which a plurality of electronic components 32 and the like are mounted and a bag structure having the opening 11 in one direction. A case 10 that is inserted and accommodated in the direction along the plane of the board from the part 11 side. When the printed circuit board 31 is inserted and fixed in the case 10, the electronic component 32 is tilted in the thickness direction of the printed board 31. The opening 11 of the case 10 is formed by cutting at least a part of the wall so as not to interfere with the opening 11 or the inner wall surface 12 of the case 10. The opening 11 of the case 10 of the ECU 100 is cut obliquely toward the wall surface adjacent to the electronic component 32. The inner wall surface 12 of the case 10 of the ECU 100 has slit grooves 13a and 13b facing each other so as to guide both side edges of the printed circuit board 31.

That is, when the printed board 31 is inserted in the direction along the board plane through the opposed slit grooves 13a and 13b of the inner wall surface 12 of the case 10 of the ECU 100, the printed board 31 is inclined in the thickness direction. Also, the opening 11 of the case 10 is cut obliquely toward the wall surface close to the electronic component 32 mounted on the printed board 31. For this reason, if the front end of the printed circuit board 31 is inserted into the opening 11 side of the case 10 via the slit grooves 13a and 13b, the electronic components 32 mounted on the printed circuit board 31 until the assembly is completed are removed. Or inner wall 12
To prevent contact interference. Thereby, the work of housing the printed circuit board 31 on which the plurality of electronic components are mounted in the case 10 can be quickly performed without impairing the reliability.

In the above embodiment, the ECU 100
The opening 11 of the case 10 is cut obliquely so as not to interfere with the electronic components 32 mounted on the printed circuit board 31 including the inner wall surface 12 on which the slit grooves 13a and 13b are formed. However, the present invention is not limited to this, and only a part of the wall surface of the opening 11 of the case 10 that is likely to interfere with contact when the electronic component 32 mounted on the printed circuit board 31 is inserted is partially removed. You may make it cut. If the cut portion in the opening 11 of the case 10 of the ECU 100 is made as wide as possible, the case 10 made of an aluminum alloy die-cast
Since the number of parts is reduced and the connector cover 20 is made of plastic, the weight of the entire ECU 100 can be reduced.

In the above embodiment, the case 10 made of aluminum alloy die-casting is used. However, the present invention is not limited to this case, and may be a resin case made of plastic or the like. Can be similarly configured.

[Brief description of the drawings]

FIG. 1 is an external view showing an ECU to which an electronic control device according to an example of an embodiment of the present invention is applied.

FIG. 2 is a cross-sectional view showing a configuration of a main part of the ECU of FIG.

FIG. 3 is an exploded perspective view of the ECU of FIG. 1;

FIG. 4 is a cross-sectional view showing a middle of assembling the printed circuit board in the thickness direction of the ECU of FIG. 1 together with a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Case 11 Opening 12 Inner wall surface 13a, 13b Slit groove 31 Printed circuit board 32 Electronic component 100 ECU (electronic control device)

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[Procedure amendment]

[Submission date] December 20, 1999 (1999.12.
20)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (3)

[Claims] 1. A printed circuit board on which a plurality of electronic components are mounted, and a case having a bag structure having an opening in one direction, wherein the printed circuit board is inserted and accommodated in a direction along the plane of the board from the opening. When inserting and fixing the printed circuit board in the case, the inclination in the thickness direction of the printed circuit board, so that the electronic component and the opening or the inner wall surface of the case do not contact and interfere. An electronic control device, wherein at least a part of a wall surface of an opening of a case is cut and formed. 2. The electronic control device according to claim 1, wherein the opening of the case is cut obliquely toward a wall surface close to the electronic component. 3. The electronic control device according to claim 1, wherein the inner wall surface of the case has slit grooves facing each other to guide both side edges of the printed circuit board.