JP2000244150A - Electronic control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an electronic component mounted on a substrate from coming into contact with a case side and prevent a board from coming off from a slit groove, when a printed substrate is loaded in a case through its slit groove. SOLUTION: When a printed substrate 16 is inserted via facing opposite slit grooves 13a, 13b formed in an inner wall surface 11b of a case 11 of a bag structure, with an inclination size based on a draft of a molding die in an electronic control unit(ECU), dimensional relation is preset, so that an electronic component 17 does not come into contact with an opening part 11a or an inner wall surface 11b of the case 11, even if the printed substrate 16 is in its most tilted state to its thickness direction. Since the printed board 16 is inclined large as it comes up to the opening part 11a side in the slit grooves 13a, 13b of the case 11, dimensional relation is preset so that the top part of the electronic component 17 mounted on the printed board 16 does not come into contact with the opening part 11a, when it passes through the opening part 11a side of the inner wall surface 11b of the case 11.

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 Heretofore, as a structure for ensuring waterproofness of an electronic control device, a device using a bag-structured case has been 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.
Here, 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 opposing inner wall surfaces of the case. A structure in which a printed circuit board is inserted along the line is generally used.

[0003]

By the way, in the above-described structure, the material is solidified from a molten state in the molding die, so that a bag structure having a shape determined by the molding die and a deep case on the back side is formed. At the time of molding, a predetermined draft is required for the inner wall surface and the slit groove facing the case. For example, when molding a case by aluminum alloy die casting, it is necessary to keep the thickness constant in order to prevent nests and sink marks, which are defects caused by the molten metal flow state during casting, to reduce the weight, etc. The outer wall side also has the same draft as the inner wall side. 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 when the assembly to the case is completed.

However, when the printed circuit board is accommodated in the case through the slit groove, if the margin of the slit groove is large on the opening side of the inner wall surface of the case and the printed circuit board is inclined,
There is a problem that electronic components mounted on a printed circuit board easily come into contact with each other, causing damage or the like. In addition, if the printed circuit board is shifted toward one of the slit grooves on the opening side of the inner wall surface of the case and the printed circuit board is detached, electronic components may be damaged, and the printed circuit board may be stored in the case. Therefore, attention is required and extra time is required in the assembling process.

Accordingly, the present invention has been made to solve such a problem. When a printed circuit board is inserted and fixed through a slit groove of a case having a draft angle by a molding die, electronic components of the printed circuit board are removed from the case. It is an object of the present invention to provide an electronic control device that can be accommodated in a case without being damaged by contact with a side and without a printed circuit board coming off a slit groove.

[0006]

According to the electronic control device of the first aspect, the material is solidified from the molten state in the molding die, so that the material is formed into a shape determined by the molding die. Electronic components mounted on a printed circuit board when the printed circuit board is accommodated in a direction along the plane of the board via opposed slit grooves formed on the inner wall surface of a case having a bag structure having a slope dimension based on the slope. The dimensional relationship is defined in consideration of the inclination dimension based on the draft angle at the time of forming the inner wall surface of the case and the slit groove. For this reason,
If the printed circuit board tip is inserted into the opening side of the slit groove of the case, the printed circuit board will come off from the slit groove until the assembly is completed, or the mounted electronic components will contact the opening or the inner wall surface of the case. Nothing. 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.

In the electronic control device according to the second aspect, the material is solidified from a molten state in a molding die, and is formed into a shape determined by the molding die. When the printed circuit board is inserted through the opposing slit grooves formed on the inner wall surface of the case of the structure, even if the printed circuit board is in the most inclined state in the thickness direction, the electronic components are not closed or opened. It is set in advance so as to have a dimensional relationship so as not to contact the wall surface. Here, since the inclination of the printed circuit board becomes larger as it is closer to the opening side in the slit groove of the case, the top of the electronic component mounted on the printed circuit board contacts when passing through the opening side of the inner wall surface of the case. The distance between the slit groove of the case and the inner wall surface is set in advance so as to satisfy the dimensional relationship that does not occur.

[0008] In the electronic control device according to the third aspect, the bag is formed into a shape determined by the molding die by solidifying the material from a molten state in the molding die, and the bag has an inclination dimension based on a draft angle at the time of molding. When the printed circuit board is inserted through the opposing slit grooves formed on the inner wall surface of the case of the structure, even if the printed circuit board is moved toward one slit groove on the opening side of the case, the printed circuit board is moved to the other slit groove. Is set in advance so as to have a dimensional relationship having a margin enough to be caught. That is, since the width of the slit groove of the case is larger as it is closer to the opening side, the dimension that does not deviate from the slit groove when the printed circuit board starts to be inserted into the slit groove on the opening side of the case is satisfied. As described above, the entire width and depth of the slit groove of the case and the dimension in the width direction of the printed circuit board are set in advance.

[0009]

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

FIG. 1 is a sectional view showing a main part of an electronic control apparatus according to an embodiment of the present invention. Here, FIG. 1A is a cross-sectional view in the thickness direction of the printed circuit board, and FIG. 1B is a cross-sectional view in the plane direction of the printed circuit board along the line AA in 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, is connected to an electronic control circuit formed on the printed circuit board. Only the external connection connector portion is shown.

In FIG. 1, reference numeral 10 denotes an electronic control unit (hereinafter referred to as an electronic control unit).
The ECU 10 has a substantially rectangular parallelepiped shape in which an electronic control circuit 15 including electronic components 17 mounted on a printed circuit board 16 is built in a case 11 having a bag structure made of aluminum alloy die-casting. This ECU 10
An opening 11a is formed in the upper end surface of the case 11, and the slits 13a, 13b are opposed to the inner wall surface 11b.
Are formed. Here, the inner wall surface 11b, the slit grooves 13a, 13b, etc. of the case 11 of the ECU 10 are solidified from a state in which the material is melted in the molding die, so that the mold is formed into a shape determined by the molding die. It has a slope dimension based on the slope. The external connection connector 19 is soldered and fixed to the printed circuit board 16.

The printed circuit board 16 is the case 1 of the ECU 10.
It is regulated by the one slit groove 13a, 13b and accommodated in the case 11. In the assembly completed state of the printed board 16, the lower end side (insertion tip side) of the printed board 16 is positioned by the slit grooves 13 a and 13 b, and the upper end side of the printed board 16 is positioned on the opening 11 a side of the case 11. Is fixed by a case lid (not shown) covering the periphery of the external connection connector section 19.

Next, the dimensional relationship in the thickness direction of the printed circuit board 16 when the printed circuit board 16 having the electronic control circuit 15 is accommodated in the case 11 of the ECU 10 through the slit grooves 13a and 13b is described. This will be described with reference to the cross-sectional view of FIG.

First, the tip of the printed board 16 is connected to the ECU 10
To the entrances of the left and right slit grooves 13a and 13b of the case 11. Next, when the printed circuit board 16 is pushed in, the printed circuit board 16 is guided along the slit grooves 13a and 13b, and is gradually accommodated in the back side of the case 11 of the ECU 10. During this assembly, as shown in FIG.
Of the electronic components mounted on the printed circuit board 16, the electronic component 17 which is a vertical element such as a capacitor and is closest to the opening 11 a and the inner wall surface 11 b of the case 11 does not contact the opening 11 a and the inner wall surface 11 b. It is defined to have a dimensional relationship. That is, when the printed circuit board 16 is inserted into the opening 11a of the case 11 of the ECU 10 when the printed circuit board 16 is inclined or leans in one of the slit grooves 13a, 13b, the surface of the printed circuit board 16 and the opening 11a of the case 11 are closed. The size of the gap with the edge on the inner wall surface 11b side is larger than the top of the electronic component 17, and the mutual dimensional relationship may be set in advance so as not to make contact.

Next, a description will be given of the dimensional relationship in the middle of assembling the printed circuit board 16 in the planar direction when the printed circuit board 16 having the electronic control circuit 15 is accommodated in the case 11 of the ECU 10 via the slit grooves 13a and 13b. This will be described with reference to FIG. Here, FIG. 3A is a top view as viewed from the opening side of the case 11, and FIG.
It is sectional drawing which follows the B line.

As shown in FIG. 3, first, the printed circuit board 1
The tip of 6 is made to face the entrance of the left and right slit grooves 13a, 13b of the case 11 of the ECU 10. At this time, the printed circuit board 16 is compared in the width direction with one slit groove 13b.
Even if the printed circuit board 16 is slightly offset to the side, the mutual dimensional relationship may be set in advance so that the printed circuit board 16 does not come off from the other slit groove 13a side. Thereafter, the printed circuit board 16 is moved along the slit grooves 13a and 13b by E.
Insertion is completed by inserting the CU 10 into the case 11 until the tip of the CU 10 contacts the case.

That is, after the printed circuit board 16 is inserted into the slits 13a, 13b of the case 11 on the side of the opening 11a, the printed circuit board 16 is securely regulated without being detached from the slits 13a, 13b and is accommodated in the case 11. In the assembly completed state of the printed board 16, as described above, the lower end of the printed board 16 is
The printed circuit board 16 is positioned and fixed by a case lid (not shown) or the like that covers the periphery of the external connection connector portion 19 in which the upper end side of the printed circuit board 16 is located on the opening 11a side of the case 11.

Here, the total width between the left and right slit grooves 13a and 13b of the case 11 of the ECU 10 is TW, and the left and right depth dimensions of the slit grooves 13a and 13b are the same as SD. If the dimension is CW,
What is necessary is just to set in advance such that the dimensional relationship satisfies the following inequality (1). As shown in FIG. 3, even if the printed circuit board 16 is inclined forward and backward with respect to the left and right slit grooves 13a and 13b in different directions, the inclination angle at this time is small, so that the printed board 16 is substantially in the width direction of the printed circuit board 16. It can be considered equal to the dimension CW.

[0019]

TW−SD <CW (1) If the dimensional relationship in the inequality (1) is satisfied, once the printed circuit board 16 is inserted into the slit grooves 13a and 13b, the slit groove 13a is obtained. , 13b gradually narrows from TW on the side of the opening 11a of the case 11 based on the draft of the case 11, so that there is no inconvenience that the width of the case 11 deviates from the slit grooves 13a, 13b.

As described above, the ECU 10 as the electronic control device of the present embodiment has a printed board 16 on which a plurality of electronic components 17 and the like are mounted, the opening 11a in one direction, and the printed board 16 extending along the board plane. In a bag structure having slit grooves 13a and 13b opposed to the inner wall surface 11b so as to be inserted in the direction, the material is solidified from a molten state in a molding die, and is molded into a shape determined by the molding die,
A case 11 for accommodating the printed circuit board 16 through the slit grooves 13a and 13b;
The electronic component 17 and the inner wall surface 11b of the case 11 and the slit grooves 13a, 13b are formed in accordance with the inclination size based on the draft when the 1b and the slit grooves 13a, 13b are formed and the external dimensions including the thickness of the printed circuit board 16. This defines the dimensional relationship.

That is, the case 11 of the bag structure of the ECU 10
Opposing slit grooves 13 formed in the inner wall surface 11b
When the printed circuit board 16 is inserted in a direction along the plane of the board via the a and 13b, the material solidifies from the melted state in the mold in the electronic component 17 mounted on the printed circuit board 16. Then, the inner wall surface 11b and the slit groove 13 of the case 11 formed into a shape determined by the forming die
The dimensional relationship is defined in consideration of the inclination dimension based on the draft angle at the time of molding of a and 13b. For this reason, Case 1
If the front end of the printed circuit board 16 is inserted into the opening 11a side of the first slit groove 13a, 13b, the printed circuit board 16 may come off from the slit groove 13a, 13b until the assembly is completed.
The mounted electronic component 17 is connected to the opening 11 of the case 11.
a or the inner wall surface 11b. Thus, the printed circuit board 1 on which a plurality of electronic components are mounted
6 can be promptly executed without impairing the reliability.

Further, E as the electronic control device of the present embodiment
The CU 10 connects the printed circuit board 16 to the slit grooves 13a, 1a.
When the printed circuit board 16 is inserted into and fixed to the case 11 via the third board 3b, the printed circuit board 16 is not
The dimensional relationship that the electronic component 17 does not contact the opening 11a or the inner wall surface 11b of the case 11 due to the inclination due to the gap between the electronic component 17 and the electronic component 17 is defined.

That is, when the printed circuit board 16 is inserted through the opposed slit grooves 13a and 13b formed on the inner wall surface 11b of the case 11, the printed circuit board 16 is in a state of being inclined most in the thickness direction. The electronic component 17 is also set in advance so as to have a dimensional relationship such that the electronic component 17 does not contact the opening 11a or the inner wall surface 11b of the case 11. Here, the printed circuit board 16 is the slit groove 13 of the case 11.
In FIGS. 2A and 2B, the closer to the opening 11a side, the larger the inclination. Therefore, as shown in FIG. 2, the top of the electronic component 17 mounted on the printed circuit board 16 is
Of the case 11 so as to satisfy a dimensional relationship that does not make contact when passing through the opening 11a side of the
The distance between 3a, 13b and the inner wall surface 11b is set in advance.

The ECU 10 as the electronic control device of the present embodiment divides the printed circuit board 16 into the slits 13a,
When the printed circuit board 16 is inserted into and fixed to the case 11 via the 13b, the printed circuit board 16 is moved toward one of the slit grooves 13b (13a) on the opening 11a side of the case 11.
Defines a dimensional relationship that does not deviate from the other slit groove 13a (13b).

That is, when the printed circuit board 16 is inserted through the opposed slit grooves 13a, 13b formed on the inner wall surface 11b of the case 11, the printed circuit board 16 is inserted into one of the slit grooves on the side of the opening 11a of the case 11. 13b (1
It is set in advance so that the printed circuit board 16 has a dimensional relationship with a margin enough to be hooked to the other slit groove 13a (13b) even when approached to 3a). That is, as the slit grooves 13a and 13b of the case 11 are closer to the opening 11a side, the facing width increases, and as shown in FIG.
When inserting the printed circuit board 16 into the slit grooves 13a, 13b on the opening 11a side of the case 11, the entire width of the slit grooves 13a, 13b of the case 11 is satisfied so as to satisfy a dimensional relationship that does not deviate from the slit grooves 13a, 13b. TW
And the depth dimension SD and the dimension C in the width direction of the printed circuit board 16
W is preset.

By the way, in the above embodiment, the slit grooves 13a in the opening 11a of the case 11 of the ECU 10,
Although the width of 13b is described assuming only the inclination dimension based on the draft at the time of molding, the present invention is not limited to this, and the ECU 10 shown in FIG. If a chamfer or an R-shaped surface is provided on the opening 11a side of the case 11 in a direction in which the entrance sides of the slit grooves 13a and 13b are widened in the thickness direction of the printed circuit board 16, the work at the initial stage of inserting the printed circuit board 16 becomes easier. be able to. In this case, it is necessary to make the gap between the top of the electronic component 17 and the inner wall surface 11b of the opening 11a of the case 11 wider.

Further, in the above embodiment, the case 11 made of an aluminum alloy die-cast is used. However, the present invention is not limited to this, and may be a resin case made of a plastic resin or the like. The same configuration can be used.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main configuration of an ECU according to an example of an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a state in which the ECU according to the example of the embodiment of the present invention is being assembled in the thickness direction of the printed circuit board.

FIG. 3 is an explanatory diagram showing a state in which the ECU according to the example of the embodiment of the present invention is being assembled in the width direction of the printed circuit board.

[Explanation of symbols]

 10 ECU (Electronic Control Equipment) 11 Case 11a Opening 11b Inner Wall 13a, 13b Slit Groove 16 Printed Circuit Board 17 Electronic Components

Claims (3)

[Claims] 1. A bag structure having a printed board on which a plurality of electronic components are mounted, an opening in one direction, and a slit groove facing an inner wall surface of the printed board so that the printed board is inserted in a direction along a plane of the board. And a case for accommodating the printed circuit board through the slit groove by being formed into a shape determined by the molding die by solidifying the material from a molten state in the molding die. Defining the dimensional relationship between the electronic component and the inner wall surface and the slit groove of the electronic component and the case according to an inclination dimension based on a draft angle at the time of forming the wall surface and the slit groove and an external dimension including a thickness of the printed circuit board. Electronic control equipment characterized. 2. When the printed circuit board is inserted into and fixed to the case through the slit groove, the printed circuit board is inclined by a gap between the electronic device and the case in a thickness direction of the printed circuit board. 2. The electronic control device according to claim 1, wherein the electronic control device defines a dimensional relationship that does not make contact with the opening or the inner wall surface. 3. When the printed circuit board is inserted into and fixed to the case through the slit groove, when the printed circuit board is moved toward one of the slit grooves on the opening side of the case, the printed circuit board is The electronic control device according to claim 1 or 2, wherein a dimensional relationship that does not deviate from the other slit groove is defined.