JP6584547B2 - Electronic control unit - Google Patents

Description

  The present application relates to an electronic control device in which an electronic circuit board is housed in a housing having a vent hole.

  Electronic control devices used for controlling vehicles and the like are generally printed circuit boards on which electronic components such as input / output circuits, communication circuits, microcomputers, power supply circuits, and connectors for connection to external devices are mounted. The substrate is housed in a housing.

  As a waterproof structure for the housing of such an electronic control device, a printed circuit board is housed inside a housing consisting of a cover and a base so that only the connector portion is exposed, and the mating surfaces of the cover, base and connector are waterproof. Those bonded with a sealing material or the like are known.

  In an electronic control device having such a waterproof structure, a water-repellent filter manufactured by a microporous material that prevents air from entering the casing and allows air to pass through the ventilation holes provided in the cover or base. By providing the air flow inside and outside the housing, deformation of the housing structure and damage to the airtight structure due to a difference in atmospheric pressure inside and outside the housing are prevented (for example, see Patent Document 1).

Japanese Patent No. 4969661

  In the above-mentioned Patent Document 1, since the water repellent filter is provided in the vent hole, the entry of water into the housing is suppressed. However, in order to prevent the water-repellent filter made of fine porous material from being soiled, in order to prevent direct water exposure from rainwater, the vent hole is not installed in the sky direction where rainwater falls, or the vent hole It is necessary to take measures such as providing a separate lid.

  In the case of the former measure, especially in the case of a general-purpose electronic control unit casing that is intended to be mounted on a plurality of types of vehicles, the casing cannot be installed in a direction in which the ventilation holes face the sky. There is a problem that the mounting direction becomes a restriction in the installation layout. In the latter measure, there is a problem that it is difficult to effectively prevent water from a direction other than the top direction, for example, the horizontal direction, even if a lid is provided only for the top direction. .

An electronic control device disclosed in the present application is provided with an electronic circuit board on which a connector and electronic components are mounted, an electronic circuit board that is housed inside, a sealed housing, and an inside and outside of the housing that pass through And a water repellent filter fixed so as to cover the ventilation hole from the inside of the housing, and a lid extending outside the housing with a space above the ventilation hole is provided. An opening is formed with the body, the periphery of the opening is surrounded by a standing wall, and the surface of the casing where the opening is formed is provided at a higher position than the surface of the casing where the standing wall is formed. A notch is formed on the wall, the notch is provided at a position not facing the opening , and the vent hole, the lid, and the standing wall are formed integrally with the housing, and are integrally formed with the housing. Constructed vents, lids, and standing walls are It is one that is bet without configuration.

  According to the electronic control device disclosed in the present application, the mounting direction of the electronic control device is not a restriction in the installation layout, and direct water exposure to the vent holes can be suppressed.

1 is a perspective view showing an external appearance of an electronic control device in Embodiment 1. FIG. 1 is an exploded perspective view showing a schematic configuration of an electronic control device in Embodiment 1. FIG. It is the perspective view which looked at the cover and water repellent filter of FIG. 2 from the back surface. FIG. 3 is an enlarged perspective view of a ventilation portion of the electronic control device according to the first embodiment. FIG. 5 is a plan view, a cross-sectional view, and a rear view of the ventilation portion of FIG. 4. 3 is a diagram illustrating an example of a mounting direction of the electronic control device in Embodiment 1. FIG. 6 is a diagram illustrating an example of another mounting direction of the electronic control device according to Embodiment 1. FIG. 6 is a diagram illustrating an example of another mounting direction of the electronic control device according to Embodiment 1. FIG. 6 is a diagram illustrating an example of another mounting direction of the electronic control device according to Embodiment 1. FIG. It is a figure explaining the effect with respect to the shape of the standing wall in Embodiment 1. FIG. 3 is a cross-sectional view showing an example of a mold structure of a part of the cover in Embodiment 1. FIG.

  Hereinafter, an electronic control device according to an embodiment will be described with reference to the drawings. In each of the drawings, the same or equivalent members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
A schematic configuration of the electronic control device 1 according to the first embodiment will be described. 1 is a perspective view showing an external appearance of the electronic control device 1, FIG. 2 is an exploded perspective view showing a schematic configuration of the electronic control device 1, and FIG. 3 is a perspective view of the cover 3 and the water repellent filter 10 of FIG. FIG. As shown in FIG. 1, the electronic control device 1 includes a housing 2, a connector 6 connected to another input / output device (not shown), and a ventilation portion 9 that ventilates the inside and outside of the housing 2. For example, it is mounted in an engine room.

  As shown in FIG. 2, the housing 2 is configured to be divided into two in the Z direction by two housing members, a cover 3 and a base 4. The cover 3 has a ventilation portion 9 surrounded by a standing wall 15 and is produced by molding polybutylene terephthalate (PBT) having excellent heat resistance and durability, for example. The base 4 is made of, for example, aluminum, stainless steel, or PBT resin.

  The electronic circuit board 5 housed in the housing 2 has a mounting pattern and a wiring pattern (both not shown) formed on the board, and an electronic component 7 such as an input / output circuit, a communication circuit, a microcomputer, and a power supply circuit. And the connector 6 are mounted. One of the terminals 6a of the connector 6 is connected to the electronic component 7 through the mounting pattern and the wiring pattern, and the other of the terminals 6a is exposed to the outside of the electronic control device 1 and connected to another input / output device (not shown). Is done. The connector housing 6b surrounding the terminal 6a protrudes from an opening provided on the mating surface of the cover 3 and the base 4, and constitutes an outer shell of the electronic control device 1 together with the cover 3 and the base 4.

  The electronic circuit board 5 on which the electronic component 7 and the connector 6 are mounted is fixed by fixing the screw 8 to the screw hole 3a (see FIG. 3) of the cover 3 through the through hole 5a provided in the electronic circuit board 5. It is fixed to the cover 3. An adhesive sealant or the like (not shown) is applied to the joint surface 19 where the cover 3, the base 4 and the connector 6 are in contact with each other, the interface is sealed, and the cover 3 and the base 4 are fitted. As a result, the electronic circuit board 5 is sandwiched and stored between the cover 3 and the base 4 from the Z direction, and the waterproof and sealed electronic control device 1 is formed together with the connector 6.

  Next, the structure of the ventilation part 9 is demonstrated. As shown in FIGS. 2 and 3, the ventilation portion 9 is surrounded by a standing wall 15 and includes a ventilation hole 11, a water repellent filter 10, and a lid 14. 4 is an enlarged perspective view of the ventilation portion 9 of the electronic control device 1, and FIG. 5 is a plan view (FIG. 5A), a cross-sectional view (FIG. 5B), and a rear view (FIG. 5) of the ventilation portion 9. (C)). Note that FIG. 5B is a cross-sectional view taken along one-dot chain line AA in FIG. 5A, and the water-repellent filter 10 is omitted in FIG. As shown in FIG. 5B, the ventilation portion 9 includes a ventilation hole 11 that penetrates the outer wall surface 3 b and the inner wall surface 3 c of the cover 3, and the inside and outside of the housing 2 are ventilated through the ventilation hole 11. The Thereby, the deformation | transformation of the housing | casing structure by the pressure difference between the inside and outside of the housing | casing 2 of a waterproof sealing structure, and the damage of an airtight structure can be prevented. The ventilation hole 11 is produced by integral molding when the cover 3 is produced, for example. The vent hole 11 disclosed in the present embodiment has a configuration in which three vent holes 11 are provided by dividing a circle into three as shown in FIG. 5C. However, the shape and number of the vent holes 11 are as follows. This is not a limitation.

  As shown in FIG. 3, the water repellent filter 10 has a water repellent filter fixing surface 12 surrounded by a water repellent filter positioning projection 13 provided on the inner wall surface 3 c of the cover 3, for example, so as to cover the vent hole 11. It is fixed using heat welding or double-sided tape. With this water repellent filter 10, it is possible to prevent water or oil from passing through the ventilation hole 11 into the housing 2. The water-repellent filter positioning protrusion 13 that indicates the position where the water-repellent filter 10 is fixed is manufactured by, for example, integral molding when the cover 3 is manufactured. The shape of the water-repellent filter 10 is circular according to the shape of the vent hole 11, but is not limited to this as with the shape of the vent hole 11.

  A lid 14 that extends outside the cover 3 with a space 11 a is provided at the top of the vent hole 11. The outer wall surface 3 b side of the cover 3 of the vent hole 11 is covered with a lid 14 provided so as to form an opening 18 communicating with the inside of the housing 2. The lid 14 is produced, for example, by integral molding when the cover 3 is produced, and is connected to the cover 3 by the lid side wall portion 14a. By covering the vent hole 11 with the lid 14, it is possible to protect water directly from the Z direction toward the water repellent filter 10.

  The opening 18 is an opening surface through which the vent hole 11 communicates with the outside of the housing 2, and is formed by being surrounded by the lid 14 and the cover 3. The surface of the cover 3 in which the opening 18 is formed (the surface including the alternate long and short dash line C in FIG. 5B) is the surface of the cover 3 in which the standing wall 15 is formed (the two-dot chain line D in FIG. 5B). The inclined surface 17 is formed at a position higher in the Z direction than the surface of the cover 3 where the opening 18 is formed, and toward the surface of the cover 3 where the standing wall 15 is formed. By adopting such a structure, water directly directed from the Z direction toward the vent hole 11 and the water repellent filter 10 flows along the inclined surface 17 in a direction away from the lower portion 18 a of the opening 18. Intrusion of water into the vent hole 11 and the water repellent filter 10 through the opening 18 can be suppressed. The vent hole 11 disclosed in the present embodiment has three vent holes 11 and three openings 18 communicated with the vent holes 11. However, the number and configuration of the openings 18 are not limited to this. Instead, for example, a plurality of openings 18 may be provided from one vent hole 11.

  The periphery of the opening 18 is surrounded by a standing wall 15 provided on the outer wall surface 3b. The standing wall 15 is formed by integral molding when the cover 3 is manufactured, for example, and is formed in an arc shape. Further, as shown in FIG. 5 (a), the notch portion 16 where the outside wall provided with the standing wall 15 and the inside outer wall surface 3b communicate with each other does not face the opening 18, that is, the lid side wall portion 14a. It is provided at an opposing position. Three notches 16 are provided here so as to have the same number as the openings 18, and a line connecting both ends of the standing wall 15 where the notches 16 are provided (FIG. 5A, two-dot chain line B). The standing wall 15 is provided at a position where the opening 18 does not contact. The upper portion 15a of the standing wall 15 is provided at a position higher than the upper portion 18b of the opening 18 and lower than the upper portion 14b of the lid 14, as shown in FIG.

So far, as shown in FIG. 1, the case where the electronic control apparatus 1 is mounted in the direction in which the ventilation part 9 faces the sky (Z direction) has been described. However, the electronic control device 1 generally uses the housing 2 having the same structure for a plurality of types of vehicles by changing the internal electronic circuit board 5 or a microcomputer program, etc., and the mounting direction of the electronic control device 1 with respect to the vehicle Is not limited to the direction in which the Z direction faces the sky (see FIG. 6A). A direction in which the Y direction faces the heaven (see FIG. 7A), a direction in which the −X direction faces the heaven (see FIG. 8A), a direction in which the X direction faces the heaven (see FIG. 9A), etc. The mounting direction of the electronic control device 1 can be various directions. FIGS. 6B to 9B also show enlarged views of the ventilation portion 9.
However, since the shape of the standing wall 15 is the above-described configuration, five points where the mounting direction of the electronic control device 1 is not a restriction in the installation layout will be described below. FIG. 10A shows a cross-sectional view of the ventilation portion 9 for explaining the fourth point, and FIG. 10B shows a side view of the ventilation portion 9 for explaining the fifth point.

(First point)
By providing the notch 16 in the standing wall 15, even if the electronic control device 1 is mounted in the direction in which the Z direction faces the sky (FIG. 6A), direct water exposure from the Z direction (FIG. 6). (B) (see arrow A) does not collect inside the standing wall 15 and is discharged through the notch 16, so that water can be prevented from entering through the opening 18.

(Second point)
By providing the standing wall 15 in a circular arc shape so as to surround the opening 18 so as to face the opening 18, the electrons in the direction in which the opening 18 faces the sky (for example, FIGS. 7A and 8A). Even when the control device 1 is mounted, direct water exposure toward the opening 18 (see arrows A in FIG. 7B and FIG. 8B) causes the standing wall 15 to divert the water. Intrusion of water through 18 can be suppressed. However, the mounting direction in which the connector 6 faces the top (FIG. 8A) is generally undesirable because water may enter the electronic control device 1 through the connector 6. Is done.

(Third point)
By providing the notch 16 at a position that does not face the opening 18, the notch 16 faces the lid side wall 14 a, so that the notch 16 faces the top (for example, FIG. 9A). Even when the control device 1 is mounted, direct water intrusion from the X direction (see arrow A in FIG. 9B) is caused by the infiltration of water through the opening 18 because the lid side wall portion 14a diverts the water. Can be suppressed.

(4th point)
As shown in the cross-sectional view of the ventilation portion 9 in FIG. 10A, the electronic control device 1 is mounted so that the notch portion 16 is inclined to the YZ plane side from the direction (for example, FIG. 9A) facing the top, When direct water exposure from the X direction (see arrow A in FIG. 10 (a)) is deflected by the lid side wall portion 14a, the water will accumulate in the inner portion 15b of the standing wall 15. By providing the standing wall 15 at a position where the opening 18 does not contact the line connecting the both ends of the standing wall 15 where the notch portion 16 is provided (FIG. 9B), the upper surface of the water is opened. Since it flows out from the notch portion 16 without reaching the portion 18 (see arrow B in FIG. 9B), the intrusion of water through the opening portion 18 can be suppressed.

(5th point)
By providing the upper portion 15a of the standing wall 15 at a position higher than the upper portion 18b of the opening 18 and lower than the upper portion 14b of the lid 14, the cutout portion 16 faces the top (for example, FIG. 9A). ), The electronic control device 1 is mounted, and a member 20 different from the electronic control device 1 is installed in contact with the upper portion 14b of the lid 14 as shown in the side view of the ventilation portion 9 in FIG. Since water directly from the X direction (see arrow A in FIG. 10 (b)) flows down in the gap portion 21 between the upper portion 15a of the standing wall 15 and the member 20, water enters through the opening 18. Can be suppressed.
In addition, although the member 20 is comprised with a soft material, the clearance gap part 21 may not be formed when the member 20 and the standing wall 15 contact, but as described in the 4th point, of the standing wall 15 Since the standing wall 15 is provided at a position where the opening 18 is not in contact with the line (two-dot chain line in FIG. 9B) connecting both ends provided with the notch 16, the standing wall 15 covered with the member 20 Even if water is collected in the inner portion 15 b, the upper surface of the collected water will flow out of the notch 16 without reaching the opening 18, and intrusion of water through the opening 18 can be suppressed.

  Next, the mold structure when the cover 3 is produced by integral molding will be described. FIG. 11 is a cross-sectional view showing the ventilation portion 9 of the cover 3 and a part of the mold 22 in the vicinity of the ventilation portion 9. The ventilation part 9 is produced by only two molds 22 of an upper mold 22a and a lower mold 22b that are divided into two in the Z direction. The vent hole 11, the lid 14, and the standing wall 15 do not have an undercut structure as viewed from the normal direction of the outer wall surface 3 b of the cover 3, that is, the Z direction, and the opening 18 is configured by a push-off structure. No complicated slide core is required for the mold. As described above, the cover 3 including the ventilation portion 9 disclosed in the present embodiment is manufactured by only two simple molds 22 without complicating the manufacturing process.

  As described above, in the electronic control device 1, the lid 14 that extends outside the cover 3 with the space 11 a provided above the vent hole 11 is provided, and the opening 14 is formed by the lid 14 and the cover 3, and Since the periphery of the opening 18 is surrounded by a standing wall 15 having an arc-shaped cutout portion 16, the mounting direction of the electronic control device 1 is not a restriction in the installation layout, and directly to the vent hole 11. Can be suppressed. Further, the vent hole 11, the standing wall 15, and the opening 18 included in the cover 3 can be manufactured with only two simple molds 22 without complicating the manufacturing process. Further, since the surface of the cover 3 in which the opening 18 is formed is provided at a position higher in the Z direction than the surface of the cover 3 in which the standing wall 15 is formed, the surface of the vent hole 11 that has passed through the outer wall surface 3b is covered. Water can be suppressed. Further, since the inclined surface 17 is formed toward the outer wall surface 3b around the ventilation portion 9 in which the standing wall 15 is formed, the wet water flows in a direction away from the opening portion 18 through the inclined surface 17 and passes therethrough. Water exposure to the pores 11 can be suppressed. Further, since the standing wall 15 includes the cutout portion 16, the water is not accumulated inside the standing wall 15 and is discharged through the cutout portion 16, thereby suppressing water exposure to the vent hole 11. Can do. Further, since the notch 16 is provided at a position not facing the opening 18, even if the notch 16 is in the direction facing the top, the lid side wall 14a facing the notch 16 diverts the water. Water exposure to the vent hole 11 can be suppressed. Further, since the standing wall 15 is provided at a position where the opening 18 does not contact the line connecting both ends of the standing wall 15 where the notch 16 is provided, the electronic control device 1 Even if it is mounted with an inclination, the water collected in the inner portion 15b of the standing wall 15 flows out of the notch 16 and can prevent water from entering the vent hole 11.

  Note that the housing 2 of the electronic control device 1 disclosed in the present embodiment is composed of two housing members, and the cover 3 has the vent hole 11 only in the easy assembly. However, the present invention is not limited to this. The housing 2 may be configured from one housing member or a plurality of housing members, and the air holes 11 may be provided in a housing member different from the cover 3. In addition, the ventilation hole 11, the lid 14, and the standing wall 15 provided in the ventilation part 9 are provided in the cover 3 by integral molding. However, the present invention is not limited to this, and the lid 14 and the standing wall 15 are separately manufactured, for example, fitted. In some cases, the cover 3 may be provided.

  The configuration shown in the first embodiment is an example of the configuration of the present application, and can be modified and configured such that a part of the embodiment is omitted without departing from the gist of the present application. Needless to say.

DESCRIPTION OF SYMBOLS 1 Electronic controller, 2 housing | casing, 3 cover, 3a screw hole, 3b outer wall surface, 3c inner wall surface, 4 base, 5 electronic circuit board, 6 connector, 7 electronic component, 8 screw, 9 ventilation part, 10 water-repellent filter , 11 Air hole, 12 Water repellent filter fixing surface, 13 Water repellent filter positioning projection, 14 Lid, 14a Lid side wall, 15 Standing wall, 16 Notch, 17 Slope, 18 Opening, 19 Joint surface, 20 Member , 21 Gap, 22 Mold

Claims (6)

An electronic circuit board on which connectors and electronic components are mounted;
A housing in which the electronic circuit board is housed and sealed;
Vents provided through the inside and outside of the housing;
A water repellent filter fixed to cover the ventilation hole from the inside of the housing,
A lid extending outside the housing with a space above the vent is provided,
An opening is formed by the lid and the housing,
The opening is surrounded by a standing wall,
The surface of the housing in which the opening is formed is provided at a position higher than the surface of the housing in which the standing wall is formed,
The standing wall is formed with a notch,
The notch is provided at a position not facing the opening ;
The vent hole, the lid, and the standing wall are formed integrally with the casing,
The electronic control device characterized in that the vent hole, the lid, and the standing wall formed integrally with the casing are configured without undercut in the normal direction on the surface of the casing. .   The said housing | casing was comprised by the housing member comprised by integrally molding the said vent hole, the said lid | cover, and the said standing wall, and the other housing member, The Claim 1 characterized by the above-mentioned. Electronic control device. Electronic control device according to claim 1 or claim 2, characterized in that the inclined surface to the surface of the housing, wherein the standing wall is formed from the surface of the housing in which the opening is formed is formed. The electronic control device according to claim 3 , wherein the standing wall is provided in an arc shape. A plurality of the openings are provided corresponding to the vent holes,
The same number of the notches are provided as the openings,
5. The electronic control device according to claim 4 , wherein the standing wall is provided at a position where a line connecting both ends of the standing wall where the notch portion is provided does not contact the opening. 6. The upper part of the standing wall is higher than the upper part of the opening,
The electronic control device according to any one of claims 1 to 5 , wherein the electronic control device is provided at a position lower than an upper portion of the lid.

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