JP6715196B2 - Electronic control unit - Google Patents

Description

The present invention relates to an electronic control device in which a board is housed in a case.

An electronic control device including a substrate and a case for accommodating the substrate has been put into practical use, and various structures of the electronic control device have been proposed (for example, refer to Patent Document 1 (FIG. 1)).

The substrate (10) shown in FIG. 1B of Patent Document 1 (the numbers in parentheses indicate the reference numerals described in Patent Document 1. The same applies hereinafter) includes connectors (30, 40).
As shown in FIG. 1A of Patent Document 1, a resin mold (S) is applied to the case (50) in a state where the substrate is inserted into the bag-shaped case (50) and the connectors (30, 40) are projected. Are filled and solidified. As a result, the electronic control unit (1) is obtained.

Since the case (50) has a plurality of convex portions on the upper surface and has a complicated shape, it is generally a resin molded product. This is because a resin molded product can easily obtain a complicated shape.
When a large-capacity power electronic component is mounted on the substrate (10), the power electronic component has a large amount of heat generation, so heat countermeasures are required.

Since the resin has a low thermal conductivity, the case (50) becomes high in temperature when the substrate (10) on which an electronic component with a large amount of heat generation is mounted is housed, and the heat resistance of the case (50) is required to be increased. ..

Further, in Patent Document 1, the case (50) is an envelope type, and an opening is provided only at one end, and two connectors (30, 40) are projected from the opening. When the number of connectors increases as the performance improves, it is necessary to increase the opening length (or opening area) of the opening. Then, the case (50) becomes large.
While miniaturization of the electronic control unit (1) is required, a structure is desired in which the case does not become large even if the number of connectors increases.

Japanese Unexamined Patent Application Publication No. 2015-211109

The present invention provides an electronic control device that includes a board provided with a connector and a case that accommodates the board. The challenge is to provide.

The invention according to claim 1 is a first substrate having a first connector at one end,
A second substrate having a second connector at one end,
A pair of left and right sliders for holding the first substrate and the second substrate such that the second connector is arranged so as to be opposite to the first connector and overlaps each other in plan view;
A metal cylinder having a first opening at one end and a second opening at the other end, wherein the first connector projects from the first opening and the second connector projects from the second opening. so as to become equipped with a case for housing the first substrate and the second substrate together with the left-right a pair of sliders,
The slider is a member that slides along the inner surface of the case, and is a member interposed between the case and the first substrate and the second substrate .

In the invention according to claim 2, the first opening is a first substrate and the second substrate opening of a size capable of passing with left right a pair of sliders, the second opening, the second connector can pass The opening is a large size, and a rubber packing is provided between the second opening and the second connector.

In the invention according to claim 3, the slider includes a first holding portion that holds the first substrate and a second holding portion that holds the second substrate, and the slider is locked to the case between the case and the slider. It is characterized by having a lock mechanism for

The invention according to claim 4 is characterized in that the first opening also serves as a resin injection port, and the case is filled with a resin mold.

In the invention according to claim 1, the case is made of metal. If it is a metal, the heat dissipation performance is higher than that of a resin, and the heat resistance temperature is also higher. As the heat dissipation performance increases, the surface temperature of the case decreases.
In addition, since the case has the first opening at one end and the second opening at the other end, the first connector can be projected from the first opening and the second connector can be projected from the second opening. .. Since it has two openings, there is no concern that the case will become large even if the number of connectors increases.
Therefore, according to the present invention, it is possible to improve the heat resistance of the case and provide an electronic control device in which the case does not become large even if the number of connectors increases.
In addition, according to the present invention, since the slider is interposed between the first substrate and the second substrate and the case, a problem such as the first substrate and the second substrate contacting the case does not occur.

In the invention according to claim 2, the second opening is an opening having a size through which the second connector can pass, and the rubber packing is provided between the second opening and the second connector. The slider can urge the second connector toward the second opening portion, which allows the rubber packing between the second opening portion and the second connector to be compressed, and the second opening portion and the second opening portion can be compressed. The sealability between the connectors can be improved.

In the invention according to claim 3, a lock mechanism for locking the slider to the case is provided between the case and the slider. When the rubber packing is arranged between the second opening and the second connector, the second connector can be held in that position while the rubber packing is compressed by the lock mechanism. Further, when a resin mold is applied to the inside of the case in a later step, the lock mechanism can prevent the first and second substrates from floating when the resin molding (resin material) is filled.
The lock mechanism generally employs a structure in which the claw fits in the recess, and a click feeling is obtained when the claw fits in the recess. The insertion position of the slider is properly determined by the click feeling.

In the invention according to claim 4, the first opening also serves as the resin injection port, and the case is filled with the resin mold. The first and second substrates are fixed to the case by the resin mold.
Compared to the case where the first opening and the resin injection port are provided, the structure of the case is simplified by providing only the first opening.

FIG. 3 is a perspective view of first and second substrates and a slider according to the present invention. It is an exploded perspective view of the electronic control unit concerning the present invention. It is a figure explaining a resin molding process. It is a perspective view of the electronic control unit concerning the present invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1A, the first substrate 20 has a first leg insertion hole 23 corresponding to the first leg portion 22 extending from the first connector 21 and a through hole corresponding to a terminal 25 extending from the electronic component 24. 26 and. By inserting the terminal 25 into the through hole 26 and fixing the solder and inserting the first leg portion 22 into the first leg insertion hole 23, the first connector 21 is provided at one end and the electronic component 24 is mounted. The substrate 20 is obtained.

As shown in FIG. 1B, the second board 30 has a second leg insertion hole 34 corresponding to the second leg portion 33 extending from the second connector 31 and the third connector 32 to the second board 30 side. The second substrate 30 is obtained by inserting the second leg portion 33 into the second leg insertion hole 34.

The second connector 31 and the third connector 32 further include a third leg portion 35 extending in a direction away from the second substrate 30.
In FIG. 1A, the first board 20 further has a third leg insertion hole 27 at a position farthest from the first leg insertion hole 23. The second substrate 30 shown in FIG. 1B is turned over, and the third leg portion 35 is inserted into the third leg insertion hole 27 as indicated by arrow (1).
As a result, as shown in FIG. 1C, the second connector 31 and the third connector 32 are arranged so as to be opposite to the first connector 21, and the first substrate 20 and the second substrate 30 are arranged in a plan view. It is possible to obtain a temporary assembly with overlapping parts.

In FIG. 1C, a pair of left and right sliders 40L and 40R (L is a subscript indicating left and R is right. The same applies hereinafter) is prepared.
As shown in FIG. 1D, the slider 40R has a groove-shaped first holding portion 42 into which the first substrate 20 can be inserted, below the base portion 41, and the second substrate 30 above the base portion 41. It has a groove-shaped second holding portion 44 that can be inserted, and integrally has an arm portion 45 that swings in the up-down direction on the second holding portion 44, and a distal end portion 46 is provided with second and third arms. It integrally has a pressing piece 47 that comes into contact with the back surface (FIG. 1B, reference numeral 36) of the connector.
The arm portion 45 has a U-shaped notch 48. The U-shaped notch 48 may be a recess.

The slider 40R is tapered so that the height dimension of the tip portion 46 becomes smaller than that of the base portion 41. Further, the other slider 40L has a so-called opposite shape to the slider 40R, and other configurations are the same as those of the slider 40R. Therefore, detailed description of the other slider 40L will be omitted.

As shown in FIG. 1E, the arm 45 has a structure capable of swinging up and down. Then, the first substrate 20 can be inserted into the first holding portion 42, and the second substrate 30 can be inserted into the second holding portion 44.
As shown in FIG. 1E, a pair of sliders 40L and 40R are attached to the first and second substrates 20 and 30 in FIG. 1C.

The structure of the case 50 will be described with reference to FIG.
As shown in FIG. 2A, the case 50 is a metal tubular body having a first opening 51 at one end and a second opening 52 at the other end.
The first opening 51 left right a pair of sliders 40L, the first substrate 20 and the second substrate 30 is an opening large enough to pass with 40R.

On the other hand, the second opening 52 is an opening having a size that allows only the second connector 31 and the third connector 32 to pass through.
That is, the bottom portion 53 is provided at the other end of the case 50, and the second opening portion 52 is provided at the bottom portion 53.

The metal case 50 is preferably an aluminum die cast product. Since the aluminum die cast product is a type of casting, it is necessary to provide a draft for easy removal from the mold.
Therefore, the ceiling, bottom, and side walls of the case 50 have a tapered structure so as to spread from the second opening 52 to the first opening 51.

Previously slider as mentioned 40L, since 40R are tapered such that the tip portion 46 becomes narrower, by utilizing this tapered, left right a pair into the case 50 through the first opening 51 side slider The first substrate 20 and the second substrate 30 can be inserted together with 40L and 40R.

The second connector 31 and the third connector 32 integrally include a common flange 37, and an annular rubber packing 38 is attached to the flange 37. The outer diameter of the flange 37 is sufficiently larger than the size of the second opening 52.
The rubber packing 38 contacts the back surface of the bottom portion 53. The second and third connectors 31 and 32 are pressed by a pressing piece (FIG. 1B, reference numeral 47) to appropriately compress the rubber packing 38. As a result, the space between the second opening 52 and the second/third connector 32 is well sealed.

The case 50 is provided with a step 55 that is recessed downward at a position above the first opening 51, and a lock claw 56 that protrudes upward in the middle of the step 55.
As shown in FIG. 2B, the arm 45 is housed in the step 55, and the lock claw 56 is housed in the U-shaped notch 48. Specifically, the arm portion 45 moves while riding on the lock claw 56, and the arm portion 45 is lowered when the arm portion 45 is aligned with the lock claw 56 in the U-shaped notch 48. When this falls, a so-called click feeling (including a click sound) occurs. The click feeling makes it possible to know that the insertion of the sliders 40L, 40R and the like is completed.

A lock mechanism 60 is configured by the lock claw 56 on the case 50 side, the arm 45 on the slider 40L side, and the U-shaped notch 48 provided on the arm 45.

The lock mechanism 60 is not limited to the structure of the embodiment as long as it is provided between the case 50 and the sliders 40L and 40R and locks the sliders 40L and 40R to the case 50. The lock mechanism 60 may be provided on only one of the slider 40L and the slider 40R.

Next, as shown in FIG. 3, the case 50 is erected so that the first opening 51 faces upward. Since the bottom of the case 50 is closed by the second and third connectors 31 and 32, the case 50 is apparently a bag body having only the upper portion opened. Therefore, the injector 62 injects the resin material 63 into the case 50 through the first opening 51 (correctly, on the side of the first connector 21). When solidified, it becomes a resin mold (FIG. 4, reference numeral 64).

As the resin material 63, a two-liquid type (urethane resin or epoxy resin) is recommended. The one-pack type requires low-temperature storage, has a high viscosity, and has poor fluidity. In this respect, the two-liquid type can be stored at room temperature, is rich in fluidity, and penetrates into details.

When injecting the resin material 63, resin pressure is applied to the first substrate 20 and the second substrate 30. However, the first substrate 20 is held by the first holding portion 42 shown in FIG. 1E, the second substrate 30 is held by the second holding portion 44, and the slider 40L is held by the lock mechanism 60 shown in FIG. Since 40R is locked, there is no concern that the first substrate 20 and the second substrate 30 will float. As a result, the finishing accuracy of the electronic control unit 10 can be improved.

As shown in FIG. 4, in the electronic control unit 10, the first connector 21 projects from the first opening 51 of the case 50, and the second connector 31 and the third connector 32 project from the second opening 52 of the case 50. I did it. Since the case 50 has the openings 51 and 52 at one end and the other end, respectively, there is no concern that the case 50 becomes large even if the number of the connectors 21, 31, and 32 increases.

The case 50 is made of metal such as aluminum die cast. A metal has a higher thermal conductivity than a resin. When the thermal conductivity is high, the heat inside the case 50 is actively released to the atmosphere. Ie. When the heat dissipation performance is improved, the temperature of the case 50 is decreased and the internal electronic components are appropriately protected.

Further, if the case 50 is made of resin, it is necessary to increase the heat dissipation area and lower the temperature of the case itself because the heat resistance is low. The heat dissipation area can be achieved by enlarging the case. However, increasing the size of the case 50 is not preferable.
In this respect, if the case 50 is made of metal as in the present embodiment, the heat resistance is high, so there is no need to increase the heat radiation area, and the case 50 can be easily miniaturized.

Therefore, the case 50 made of metal has a great advantage. However, the metal case needs to have a larger draft angle than the resin case. If the gradient is large, the substrate easily contacts the inner surface of the case. Upon contact, the substrate is affected by vibration.
In this regard, in this embodiment, the sliders 40L and 40R having the taper are interposed so as to prevent the trouble such as the contact. The sliders 40L and 40R may be made of resin without any problem.

Incidentally, in FIG. 4, the third connector 32 may be omitted. In this case, the total number of connectors is 2.
Alternatively, the fourth connector may be projected from the first opening 51 in addition to the first connector 21. In this case, the total number of connectors is four.

Further, the electronic control device 10 of the present invention is suitable for an in-vehicle device that is required to be downsized, but may be applied to other uses.

The present invention is suitable for an electronic control device mounted on a vehicle.

10... Electronic control device, 20... 1st board, 21... 1st connector, 30... 2nd board, 31... 2nd connector, 38... Rubber packing, 40L, 40R... Slider, 42, 44... Holding part, 50 ... case, 51... first opening, 52... second opening, 60... locking mechanism, 64... resin mold.

Claims (4)

A first substrate having a first connector at one end,
A second substrate having a second connector at one end,
A pair of left and right sliders for holding the first substrate and the second substrate such that the second connector is arranged so as to be opposite to the first connector and overlaps each other in plan view;
A metal cylinder having a first opening at one end and a second opening at the other end, wherein the first connector projects from the first opening and the second connector projects from the second opening. so as to become equipped with a case for housing the first substrate and the second substrate together with the left-right a pair of sliders,
The electronic controller is characterized in that the slider is a member that slides along an inner surface of the case, and is a member interposed between the case and the first substrate and the second substrate .
The first opening is an opening of the left-right a pair of the first substrate and the second substrate is passable size together with the slider,
The second opening is an opening having a size through which the second connector can pass,
The electronic control device according to claim 1, wherein a rubber packing is provided between the second opening and the second connector.
The slider includes a first holding portion that holds the first substrate and a second holding portion that holds the second substrate,
The electronic control device according to claim 1 or 2, further comprising a lock mechanism that locks the slider to the case between the case and the slider. The electronic control device according to claim 1, wherein the first opening also serves as a resin injection port, and a resin mold is filled in the case.

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