JP2003229678A - Enclosure structure for electronic controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an enclosure structure for controller that can prevent condensates from dropping onto electronic parts, substrate pattern, etc., in an enclosure. <P>SOLUTION: An electronic controller 1 (accordingly, the enclosure 7 of the controller 1) is loaded in an engine room or compartment of a vehicle. At the time of loading the controller 1 in, for example, the compartment of the vehicle, the controller 1 is fixed to a floor, etc., of the compartment with a cover 13 on the downside so that a printed board 5 and the enclosure 7 may become horizontal as shown in the figure. When the enclosure 7 is loaded in the compartment, particularly, the printed board 5 becomes horizontal and the four side walls 17 of the enclosure become vertical, but a ceiling part (ceiling section) 19 of the enclosure 7 in the upper part of the figure (in the upward direction at the loading time) is slightly inclined (by, for example, 5°) from the horizontal plane. Consequently, an internal side face (ceiling surface) 19a of the ceiling section 19 is also inclined similarly and the whole ceiling surface 19a becomes an inclined surface inclined at the same angle. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing structure of an electronic control unit arranged in, for example, an engine room of a vehicle.

[0002]

2. Description of the Related Art Conventionally, for example, an electronic control unit (ECU) is arranged in an engine room or a vehicle compartment of a vehicle to perform various controls of the vehicle. This electronic control unit is mainly composed of a printed circuit board on which many electronic components are mounted and a metal housing for housing the printed circuit board and the like. Protected from the outside environment.

Further, in recent years, in order to more reliably protect electronic components and the like from the external environment, there has been known a technique in which the electronic control unit itself is housed in a resin protective box so that the casing has a double structure. Has been.

[0004]

However, in the above-mentioned technique, as shown in FIG. 14, when the inside of the casing P1 becomes high in humidity and dew condensation occurs, the casing P1 (that is, the case P2).
Condensation water may adhere to the inner wall ceiling surface P3 of the side), grow, and finally the condensation water may drop on the electronic component P4, the printed circuit board P5, or the like.

Further, as shown in FIG. 15, a protection box P
6 is used, when dew condensation occurs due to high humidity inside the protection box P6, dew condensation water adheres to the inner wall ceiling surface P7 of the protection box P6 and grows,
Condensed water may drip inside the case P1.

As a result, dew condensation water may adhere to the electronic components and the substrate pattern, and migration (whisker-like structure) may occur, leading to a problem such as a pattern short circuit.
There is a problem that it is not preferable in terms of durability. The present invention has been made to solve the above problems,
An object of the present invention is to provide a housing structure of an electronic control device capable of preventing dew condensation water from dripping on an electronic component, a board pattern or the like in the housing.

[0007]

[Means for Solving the Problems and Effects of the Invention] (1) According to the first aspect of the present invention, when a housing containing a printed circuit board on which an electronic component is mounted is attached to a mounting target such as a vehicle body, the printing is performed. The present invention relates to a housing structure of an electronic control device in which a substrate is horizontal or vertical, and in the present invention, at least dew condensation water is included in an upper side (top direction) inner side surface (for example, a ceiling surface) when the housing is attached. It is characterized in that the inner side surface corresponding to the area for preventing dripping is inclined with respect to the horizontal.

That is, according to the present invention, when the housing is mounted on a vehicle or the like, the surface of the ceiling surface (corresponding to the area for preventing the dew condensation water from dropping) is inclined in the ceiling direction. Therefore, even if dew condensation occurs due to high humidity inside the housing and dew condensation water adheres to the ceiling surface of the housing and grows, the dew condensation water does not drip onto the electronic substrate or the printed circuit board. As a result, migration does not occur and it is possible to prevent problems such as pattern short-circuits and electronic component failures, so that the function of the electronic control device does not deteriorate.

(2) The invention according to claim 2 relates to a housing structure of an electronic control device in which the housing is horizontal or vertical when the housing containing electronic components is attached to a mounting object such as a vehicle body. Therefore, in the present invention, at least the inner side surface (for example, the ceiling surface) in the upward direction (top direction) when the housing is attached corresponds to the horizontal direction. It is characterized by being inclined.

That is, according to the present invention, when the housing is mounted on a vehicle or the like, the surface of the ceiling surface (corresponding to the area for preventing the dew condensation water from dropping) is inclined in the ceiling direction. Therefore, even if dew condensation occurs due to high humidity inside the housing and dew condensation water adheres to the ceiling surface of the housing and grows, the dew condensation water does not drip onto the electronic substrate or the printed circuit board. As a result, migration does not occur and it is possible to prevent problems such as pattern short-circuits and electronic component failures, so that the function of the electronic control device does not deteriorate.

(3) The invention of claim 3 is characterized in that a horizontal plane is not provided on the inner surface in the upward direction when the housing is attached. In the present invention, since the horizontal plane is not formed on the inner surface in the upward direction, the entire inner surface is inclined. Therefore, even if dew condensation occurs on the inner side surface and the dew condensation water grows, the dew condensation water can be surely guided to the side wall side around the inner side surface, so that it is possible to reliably prevent a pattern short circuit or the like.

(4) The invention of claim 4 is characterized in that at least the inner side surface of the housing corresponding to the region for preventing the dew condensation water from dropping is an inclined flat surface. The present invention exemplifies the shape of the inner side surface, whereby the condensed water can be surely guided to another place (other than the inclined plane).

(5) The invention of claim 5 is characterized in that at least the inner side surface of the housing corresponding to the area for preventing the dew condensation water from dropping is a curved surface. The present invention exemplifies the shape of the inner side surface, whereby the condensed water can be surely guided to another place (other than the curved surface).

(6) The invention according to claim 6 is characterized in that the outer side surface in the upward direction at the time of mounting the housing is configured to be horizontal when the housing is placed on a horizontal plane. . The present invention exemplifies the outer shape of the housing. In the present invention, when the housing is placed on a horizontal surface such as the ground, the outer shape is configured so that the outer surface (upward when the housing is attached) is horizontal. Similar housings can be stacked on top of each other. Therefore, there is an advantage that the case is easy to handle and workability is improved.

(7) The invention of claim 7 is characterized in that a float material is disposed between the printed circuit board and the floor side of the housing to form a gap serving as a flow path for dew condensation water. In the present invention,
Since the float material is placed between the printed circuit board and the floor side of the housing (the floor side that is the lower side during installation) to form a gap that serves as a channel for the condensed water, the condensed water flows from the wall surface. However, it is difficult to contact the printed circuit board. As a result, it is possible to more reliably prevent the occurrence of a short circuit or the like.

(8) The invention of claim 8 is characterized in that a drainage hole for discharging dew condensation water to the outside of the casing is formed in the casing. In the present invention, since the housing has the water drainage hole, the dew condensation water generated in the housing can be discharged to the outside of the housing. As a result, it is possible to more reliably prevent the occurrence of a short circuit or the like.

(9) According to a ninth aspect of the present invention, the protective box is provided with an inner casing that accommodates a printed circuit board on which electronic components are mounted, and a protective box that is an outer casing that accommodates the inner casing. The present invention relates to a housing structure of an electronic control device in which a printed circuit board is horizontal or vertical when the protective box is attached to a mounting object such as a vehicle body. Among the side surfaces (for example, the ceiling surface), at least the inner side surface corresponding to the region where the condensation water is prevented from dropping is inclined with respect to the horizontal.

The present invention exemplifies a case in which electronic components, a printed circuit board, and the like are housed in an inner housing, and further, the inner housing is housed in a protective box, thereby forming at least a double structure of the housing. Is. In other words, in the present invention, since the inner surface in the upward direction when the protection box is attached (that is, at least the inner surface corresponding to the area for preventing the dripping of the dew condensation water) is inclined, the generated dew condensation water is Move along the slope. As a result, it is possible to prevent the condensed water from dripping on the side of the inner casing disposed below the inner side surface, so that a problem such as a short circuit does not occur in the printed circuit board or the like in the inner casing.

According to a tenth aspect of the present invention, there is provided an inner housing in which electronic components are housed and a protection box which is an outer housing in which the inner housing is housed, and the protection box is mounted on a vehicle body or the like. The present invention relates to a housing structure of an electronic control device in which a protection box is horizontal or vertical when attached to an object, and in the present invention, an inner side surface in an upward direction (top direction) when the protection box is attached (for example, a ceiling surface). Among them, at least the inner side surface corresponding to the area where the condensation water is prevented from dropping is inclined with respect to the horizontal.

The present invention exemplifies a case in which at least a double structure is formed by housing electronic components, a printed circuit board and the like in an inner housing, and further housing the inner housing in a protection box. Is. In other words, in the present invention, since the inner surface in the upward direction when the protection box is attached (that is, at least the inner surface corresponding to the area for preventing the dripping of the dew condensation water) is inclined, the generated dew condensation water is Move along the slope. As a result, it is possible to prevent the condensed water from dripping on the side of the inner casing disposed below the inner side surface, so that a problem such as a short circuit does not occur in the printed circuit board or the like in the inner casing.

(11) The invention of claim 11 is characterized in that a horizontal plane is not provided on the inner surface in the upward direction when the protective box is attached. In the present invention, since the horizontal plane is not formed on the inner surface in the upward direction, the entire inner surface is inclined. Therefore, even if dew condensation occurs on the inner side surface and the dew condensation water grows, the dew condensation water can be surely guided to the side wall side around the inner side surface, so that it is possible to reliably prevent a pattern short circuit or the like.

(12) The invention of claim 12 is characterized in that the inner surface of the protective box corresponding to at least the area for preventing the dew condensation water from dropping is an inclined flat surface. The present invention exemplifies the shape of the inner side surface, whereby the condensed water can be surely guided to another place (other than the inclined plane).

(13) The invention of claim 13 is characterized in that the inner side surface of the protective box corresponding to at least the region for preventing the dew condensation water from dropping is a curved surface. The present invention exemplifies the shape of the inner side surface, whereby the condensed water can be surely guided to another place (other than the curved surface).

(14) The invention of claim 14 is characterized in that the outer side surface in the upward direction when the protective box is attached is configured to be horizontal when the protective box is placed on a horizontal plane. . The present invention exemplifies the outer shape of the protection box. In the present invention, when the protection box is placed on a horizontal surface such as the ground, the outer shape is configured so that the outer surface (upward when the protection box is attached) becomes horizontal, so the protection box Similar protective boxes etc. can be stacked on top of each other. Therefore, the protection box is easy to handle,
There is an advantage that workability is improved.

(15) According to a fifteenth aspect of the present invention, the inner casing and the protective box are connected by the connecting portion, and the opening or the gap portion of the inner casing is arranged above the connecting portion at the time of mounting. It is characterized by In the present invention, since the opening or the gap of the inner casing (for example, the connector) is arranged above the connecting portion, even when the condensed water flows along the side wall to the connecting portion side, the inner casing is Never get inside the body. As a result, it is possible to more reliably prevent the occurrence of a short circuit or the like.

In each of the above-mentioned inventions, the degree of inclination of the inner surface is, for example, 5 ° or more, and the degree of curvature of the curved surface (for example, spherical surface) is, for example, a radius of 500 mm or less,
Condensation water is preferable because it does not drop on undesired locations on the printed circuit board and is smoothly guided to other locations.

In each of the above-mentioned inventions, the term "horizontal or vertical" means a range that can be regarded as substantially horizontal or vertical, and for example, a range within ± 2 ° from true horizontal or vertical is horizontal or vertical. Can be considered vertical.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION An example (embodiment) of an embodiment of a housing structure of an electronic control device of the present invention will be described below. (Embodiment 1) First, a housing structure of an electronic control unit of Embodiment 1 will be described with reference to FIG.

As shown in FIG. 1, an electronic control unit (ECU) 1 according to this embodiment includes a printed circuit board 5 on which a large number of electronic components 3 are mounted, and a substantially rectangular parallelepiped housing 7 that houses the printed circuit board 5. , And a connector 9 electrically connected to an external device (not shown).

The casing 7 is made of aluminum die-cast (or made of aluminum press, iron press, resin), and has a substantially box-shaped case 11 having one (downward in the figure) opened, and a case 11. The case 11 is composed of a substantially square iron (or aluminum or resin) cover 13 that closes the open side.
The cover 13 and the cover 13 are joined by a screw 15.

The printed board 5 is, for example, a cover 13.
The board pattern is electrically connected to the connector 9 attached to the printed board 5 by soldering or the like. The electronic control unit 1 (and therefore the casing 7) having the above-described structure is mounted in the engine room or the passenger compartment of the vehicle, and at that time, as shown in the drawing, the printed circuit board 5 and the casing 7 are horizontal. , Cover 13
The side is fixed, for example, to the floor in the passenger compartment.

In particular, in this embodiment, when the housing 7 is mounted in the vehicle compartment, the printed circuit board 5 is horizontal and the four side walls 17 are vertical, but in the upper part of the figure (top direction at the time of mounting). The ceiling part (ceiling part) 19 of is slightly inclined (for example, 5 °) from the horizontal. Therefore, the inner surface (ceiling surface) 19a of the ceiling portion 19 is similarly inclined, and the ceiling surface 19a
The whole is an inclined plane that inclines at the same angle.

As described above, in this embodiment, since the ceiling surface 19a of the case 11 is inclined, the inside of the housing 7 becomes highly humid and dew condensation occurs, and the dew condensation water adheres to the ceiling surface 19a. ,
Even if the condensed water grows, the condensed water moves along the slope of the ceiling surface 19a, and the side wall 1 on the lower side of the ceiling on the right side of FIG.
7, and flows to the cover 13 side along the side wall 17. As a result, it is possible to prevent the dew condensation water from dripping on the electronic component 3 and the printed circuit board 5, so that migration does not occur and a pattern short circuit can be prevented. As a result, there is a remarkable effect that the function of the electronic control unit 1 is not deteriorated. (Embodiment 2) Next, the housing structure of the electronic control unit of Embodiment 2 will be described, but the description of the same contents as in Embodiment 1 will be omitted.

In this embodiment, the shape of the case is significantly different from that of the first embodiment. As shown in FIG. 2, the electronic control unit 21 in the present embodiment is similar to the first embodiment in that the printed circuit board 23 and the housing 25 are horizontal.
The cover 27 side is fixed, for example, to the floor in the vehicle interior.

In this embodiment, when the housing 25 is mounted in the vehicle compartment, the ceiling side outer surface 31b of the ceiling portion 31 of the case 29 is horizontal and the four side walls 33 are vertical, but the ceiling is not. The ceiling surface 31a, which is the inner side surface of the portion 31, is slightly inclined (for example, 5 °) from the horizontal.

As described above, in this embodiment, since the ceiling surface 31a is inclined, the same effect as that of the first embodiment is obtained, and the outer surface 31b of the ceiling portion 31 is horizontal (hence, the casing). Since the outer shape of 25 is a rectangular parallelepiped shape),
Similar casings 25 and the like can be stacked on the casing 25. Therefore, the housing 25 is easy to handle,
There is an advantage that workability is improved. (Embodiment 3) Next, the housing structure of the electronic control unit of Embodiment 3 will be described, but the description of the same contents as in Embodiment 2 will be omitted.

The present embodiment is largely different from the first embodiment in the shape of the case and the mounting direction of the electronic control unit. As shown in FIG. 3, the electronic control unit 41 in the present embodiment accommodates the printed circuit board 45 on which the electronic component 43 is mounted and the printed circuit board 45 (having a case 47 and a cover 49) as in the second embodiment. ) A rectangular parallelepiped casing 51 and a connector 53.

The electronic control unit 41, as shown,
The printed circuit board 45 and the casing 51 are fixed so that the connector 53 side faces downward, for example, on a wall surface (not shown in the figure, on the right side of the figure) so that the printed circuit board 45 and the housing 51 are vertical. In this embodiment, the housing 5
When 1 is mounted in the vehicle compartment, the ceiling portion 55 on the side opposite to the cover 49 (left side in the figure) is vertical. However, the inner side surface 55a of the ceiling portion 55 is slightly inclined. Further, among the four side walls 57, the side wall 57 on the side opposite to the connector 53 (upper side in the figure: the top direction at the time of attachment) is horizontal, and the inner side surface 57a of the side wall 57 is slightly (for example, 5
°) It is inclined so that it goes down to the ceiling 55 side. The outer surface 57b of the side wall 57 is perpendicular to the ceiling direction.

As described above, in this embodiment, since the inner side surface 57a of the side wall 57 is inclined, the condensed water is guided to the ceiling portion 55 side, and the condensed water drops on the electronic parts 43 and the printed circuit board 45. Can be prevented. Further, since the outer shape of the housing 51 is a rectangular parallelepiped shape, the same housing 51 and the like can be stacked on the housing 51. Therefore, there is an advantage that the housing 51 is easy to handle and workability is improved. (Embodiment 4) Next, the housing structure of the electronic control unit of Embodiment 4 will be described, but the description of the same contents as in Embodiment 1 will be omitted.

In this embodiment, the shape of the case is greatly different from that of the first embodiment. As shown in FIG. 4, the electronic control unit 61 in the present embodiment has a printed circuit board 65 on which an electronic component 63 is mounted, a housing 71 (having a case 67 and a cover 69) that accommodates the printed circuit board 65, and a connector 73. Since the case 67 is convexly curved outward, the casing 71 is also curved and has a substantially rectangular parallelepiped shape.

The electronic control unit 61 is, as shown in the figure,
The printed circuit board 65 and the housing 71 are fixed so that the cover 69 side is on the floor, for example, so that the printed circuit board 65 and the housing 71 are horizontal. In this embodiment, when the housing 71 is mounted in the vehicle compartment, the four side walls 75 of the case 67 are vertical.
The ceiling portion 77 (when mounted in the ceiling direction) and the ceiling surface 77a that is the inner surface thereof are curved surfaces that are slightly curved so as to be convex in the ceiling direction.

As described above, in this embodiment, since the ceiling surface 77a is a curved surface, the electronic component 63 and the printed circuit board 65 are formed.
Condensation water can be prevented from dripping on the top. (Embodiment 5) Next, the housing structure of the electronic control unit of Embodiment 5 will be described, but the description of the same contents as in Embodiment 4 will be omitted.

In this embodiment, the shape of the case is greatly different from that of the fourth embodiment. As shown in FIG. 5, the electronic control unit 81 according to the present embodiment is similar to the fourth embodiment in that the printed circuit board 83 and the casing 85 are horizontal.
The cover 87 side is fixed, for example, to the floor in the vehicle interior.

In this embodiment, when the housing 85 is mounted in the vehicle compartment, the ceiling surface 89a, which is the inner side surface of the ceiling portion 89 (in the ceiling direction at the time of mounting), is convex in the ceiling direction. Although the curved surface is slightly curved, the outer surface 89b of the ceiling portion 89 is not a curved surface but a flat surface.

As described above, in this embodiment, since the ceiling surface 89a is a curved surface, the same effect as that of the fourth embodiment is obtained, and the outer surface 89b is flat (thus, the outer shape of the housing 85 is Since it has a rectangular parallelepiped shape, similar casings 85 and the like can be stacked on the casing 85. for that reason,
There is an advantage that the case 85 is easy to handle and the workability is improved. (Embodiment 6) Next, the housing structure of the electronic control unit of Embodiment 6 will be described, but the description of the same contents as in Embodiment 5 will be omitted.

In this embodiment, the shape of the case and the mounting direction of the electronic control unit are significantly different from those of the fifth embodiment. As shown in FIG. 6, the electronic control unit 91 in this embodiment is a printed circuit board 95 on which electronic components 93 are mounted.
And a housing 103 having a rectangular parallelepiped shape (having a case 97 and a cover 99) housing a printed circuit board 95, and a connector 103.

The electronic control unit 91, as shown in the figure,
The printed circuit board 95 and the casing 101 are fixed so that the connector 103 side faces downward, for example, on a wall surface (not shown in the figure, on the right side of the figure) so that the printed circuit board 95 and the housing 101 are vertical. In this embodiment, when the housing 101 is mounted in the vehicle compartment, the ceiling portion 105 on the side opposite to the cover 99 (left side in the figure) is vertical, and the side wall 107 on the four sides opposite to the connector 103 ( The side wall 107 in the upper part of the figure (upward direction at the time of mounting) is horizontal.
The inner side surface 107a of the side wall 107 is a curved surface and is curved and goes down toward the ceiling portion 105. The side wall 107
The outer side surface 107b is flat and is horizontal when mounted.

As described above, in this embodiment, since the inner side surface 107a of the side wall 107 is curved, the condensed water is condensed in the ceiling portion 105.
The electronic component 93 or the printed circuit board 9
It is possible to prevent the dew condensation water from dripping on the surface. In addition, since the outer shape of the housing 101 is a rectangular parallelepiped shape, similar housings 101 and the like can be stacked on the housing 101.
Therefore, there are advantages that the housing 101 is easy to handle and the workability is improved. (Embodiment 7) Next, the housing structure of the electronic control unit of Embodiment 7 will be described, but the description of the same contents as in Embodiment 2 will be omitted.

In this embodiment, the mounting direction of the electronic control unit and its internal structure are largely different from those of the second embodiment. As shown in FIG. 7, the basic configuration of the electronic control unit 111 in this embodiment is almost the same as that in the second embodiment, and includes a rectangular parallelepiped casing 113.

As shown in the figure, the electronic control unit 111 is fixed to a wall surface (not shown) inside the vehicle, for example, with the cover 117 side being the lower right so that the printed circuit board 115 and the housing 113 are inclined. It In this embodiment, the housing 1
When 13 is mounted in the vehicle compartment, the ceiling surface 121a, which is the inner surface of the ceiling portion 121 of the case 119 (which faces the printed circuit board 115), and the four side walls 123 are oblique. The housing 113 is attached so that the connector 125 is on the lower side.

In particular, in this embodiment, the float material 12 as a spacer is provided between the printed board 115 and the cover 117.
7 is arranged and the printed circuit board 115 is separated from the cover 117, whereby a flow path of dew condensation water is secured. As described above, in this embodiment, since the ceiling surface 121a and the side wall 123 are inclined, it is possible to prevent the dew condensation water from dripping on the electronic component 129 and the printed circuit board 115.
Further, since the flow path of the dew condensation water is secured by the float material 127, even if the dew condensation water flows from the side wall 123 to the cover 117 side, it does not come into contact with the printed circuit board 115 or the like. Therefore, also from this point, there is an advantage that the short circuit of the printed circuit board 115 can be prevented. (Embodiment 8) Next, the housing structure of the electronic control unit of Embodiment 8 will be described, but the description of the same contents as in Embodiment 4 will be omitted.

In this embodiment, the mounting direction of the electronic control unit and the structure thereof are largely different from those of the fourth embodiment. As shown in FIG. 8, the electronic control unit 1 in this embodiment
The basic configuration of 31 is almost the same as that of the fourth embodiment, and includes a casing 133 having a substantially rectangular parallelepiped shape whose upper portion is curved.

In this embodiment, since the casing 133 is mounted in the passenger compartment with an inclination, the ceiling surface 137a of the ceiling portion 137 of the case 135 and the four side walls 139 are oblique. still,
The housing 133 is attached so that the connector 141 is on the lower side. Particularly in this embodiment, drain holes 145a and 145b are provided on the lower end of the ceiling portion 137 and on the side wall 139 side of the cover 143 to connect the inside and the outside of the casing 133.

As described above, in this embodiment, since the ceiling surface 137a and the side wall 139 are inclined, it is possible to prevent the dew condensation water from dripping on the electronic component 147 and the printed circuit board 149 as in the case of the fourth embodiment. it can. In addition, the drain hole 145a,
Since the dew condensation water discharge channel is secured by 145b, even if the dew condensation water flows from the ceiling surface 137a or the side wall 139, the dew condensation water is quickly discharged to the outside of the housing 133, and the connector 141 or the printed circuit board is provided. It is difficult to contact 149. Therefore, also from this point, there is an advantage that a short circuit or the like of the printed circuit board 149 or the like can be prevented. (Embodiment 9) Next, the housing structure of the electronic control unit of Embodiment 9 will be described, but the description of the same contents as in Embodiment 1 will be omitted.

As shown in FIG. 9, in this embodiment, the electronic control unit 151 is housed in a protective box 153 made of resin and has a double casing structure. The electronic control unit 1
51 is a printed circuit board 157 on which the electronic component 155 is mounted.
And a rectangular parallelepiped casing (inner casing) 159 for housing the printed circuit board 157, and a connector 161.

Further, the protection box 153 has a housing 159.
Corresponding to the shape of the above, it has a substantially rectangular parallelepiped shape larger than that, and is composed of a container 163 that accommodates most of the electronic control unit 151 and a lid 165 that closes the open end thereof. In this embodiment, the electronic control unit 151 is arranged in the protection box 153 (via a connection part not shown) with the connector 161 on the lid 165 side, so that the bottom portion 167 of the container 163 of the protection box 153 is, for example, When mounted on the floor in the passenger compartment, the printed circuit board 157, the housing 159, and the protection box 153 are vertical.

In particular, in this embodiment, the ceiling portion 169 of the lid 165 (which is the top direction at the time of attachment) and the ceiling surface 169a, which is the plane of the inner surface thereof, are relative to the bottom portion 167 of the container 163 (hence the horizontal direction at the time of attachment). ), For example 5 °
It is inclined. Thus, in this embodiment, since the ceiling surface 169a of the protection box 153 is inclined, the housing 15
It is possible to prevent the dew condensation water from dripping on 9 (particularly the connector 161). Therefore, it is possible to suppress the occurrence of a defect such as a short circuit of the printed circuit board 157. (Embodiment 10) Next, the housing structure of the electronic control unit of Embodiment 10 will be described, but the description of the same contents as in Embodiment 9 will be omitted.

As shown in FIG. 10, this embodiment has substantially the same basic structure as that of the ninth embodiment, and the electronic control unit 171 is housed in the protection box 173. The shape of the lid 175 is different. That is, in this embodiment, the ceiling portion 177 of the lid 175 of the protection box 173, that is, the ceiling surface 177a that is the inner side surface in the ceiling direction at the time of mounting is inclined similarly to the ninth embodiment, but the lid 175 of The outer side surface 177b is the bottom portion 1 of the container 179.
It is parallel to 81 (hence horizontal when attached), and the outer shape of the protection box 173 is almost a rectangular parallelepiped.

This embodiment also has the same effects as those of the ninth embodiment, and the outer surface 177b of the lid 175 is parallel (when placed on a horizontal surface), and the protection box 1
Since the outer shape of 73 is almost a rectangular parallelepiped shape, similar protection boxes 173 and the like can be stacked on the protection box 173. Therefore, there is an advantage that the protection box 173 can be easily handled and the workability is improved. (Embodiment 11) Next, the housing structure of the electronic control unit of Embodiment 11 will be described, but the description of the same contents as in Embodiment 9 will be omitted.

As shown in FIG. 11, the present embodiment has substantially the same basic configuration as the ninth embodiment, and the electronic control unit 191 is housed in the protection box 193, but the protection box 193 is The shape of the lid 195 is different. That is, in the present embodiment, the ceiling portion 197 (which is the ceiling direction at the time of attachment) of the lid 195 of the protection box 193 and the ceiling surface 197a which is the inner surface thereof are curved so as to project in the ceiling direction, and particularly, The ceiling surface 197a is a curved surface.

Therefore, this embodiment also has the same effect as the ninth embodiment. (Embodiment 12) Next, the housing structure of the electronic control unit of Embodiment 12 will be described, but the description of the same contents as in Embodiment 10 will be omitted.

As shown in FIG. 12, the present embodiment has substantially the same basic structure as that of the tenth embodiment, and the electronic control unit 201 is housed in the protection box 203. The shape of the lid 205 is different. That is, in the present embodiment, the ceiling surface 2 of the ceiling portion 207 of the lid 205 of the protection box 203 (which is the top direction at the time of mounting).
07a has a curved surface so as to project in the top direction. Further, the outer side surface 207b of the ceiling portion 207 is the same as in the tenth embodiment.
It is the same plane as.

Therefore, this embodiment also has the same effect as that of the tenth embodiment. (Embodiment 13) Next, the housing structure of the electronic control unit of Embodiment 13 will be described, but the description of the same contents as in Embodiment 12 will be omitted.

As shown in FIG. 12, this embodiment has substantially the same basic configuration as that of the above-mentioned embodiment 12, and the electronic control unit 211 is housed in the protection box 213, but the protection box 213 has the same structure. The mounting direction is different. That is, in this embodiment, the protection box 213 is obliquely attached to the wall surface (lower left in the figure) of the vehicle, so that the electronic control unit 211 and the like are also oblique.

Particularly in this embodiment, the connecting portion 215 for connecting the electronic control unit 211 to the protective box 213 is attached below the connector 217. Therefore, this embodiment also has the same effect as that of the twelfth embodiment, and since the connecting portion 215 is attached below the connector 217, the condensed water is transferred from the side wall 219 of the protective box 213 to the connecting portion 215 side. Even if it came to
The condensed water does not enter the connector 217 (hence, inside the housing 221). As a result, it is possible to effectively prevent a short circuit or the like of the printed circuit board 223.

It is needless to say that the present invention is not limited to the above-mentioned embodiments and can be carried out in various modes without departing from the scope of the present invention. (1) For example, in the present invention, in addition to the double casing structure described above, in the case of a triple or more casing structure such as a case where the protection box is double and the ECU is housed therein. Can also be applied to.

(2) In each of the above embodiments, the printed circuit board is attached to the cover side, but it may be attached to the case side. Further, in the electronic control unit, the case side may be fixed to the floor of the vehicle or the like with the cover side facing up, or the case side may be fixed to the side wall or the like with the cover side opposite to the side wall.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a housing of an electronic control device of a first embodiment in a cutaway manner.

FIG. 2 is an explanatory view showing a housing of an electronic control device of a second embodiment in a cutaway manner.

FIG. 3 is an explanatory view showing a housing of an electronic control device of a third embodiment in a cutaway manner.

FIG. 4 is an explanatory view showing a housing of an electronic control unit of Example 4 in a cutaway manner.

FIG. 5 is an explanatory view showing a housing of an electronic control device of a fifth embodiment in a cutaway manner.

FIG. 6 is an explanatory view showing a housing of an electronic control device of a sixth embodiment in a cutaway manner.

FIG. 7 is an explanatory view showing a housing of an electronic control device of a seventh embodiment in a cutaway manner.

FIG. 8 is an explanatory view showing a housing of an electronic control unit of Example 8 in a cutaway manner.

FIG. 9 is an explanatory view showing a housing of an electronic control device of a ninth embodiment in a cutaway manner.

FIG. 10 is an explanatory view showing a housing of an electronic control unit of a tenth embodiment in a cutaway manner.

FIG. 11 is an explanatory view showing a housing of an electronic control unit of Example 11 in a cutaway manner.

FIG. 12 is an explanatory view showing a housing of an electronic control unit of Example 12 in a cutaway manner.

FIG. 13 is an explanatory view showing a housing of an electronic control unit of a thirteenth embodiment in a cutaway manner.

FIG. 14 is an explanatory diagram showing a conventional technique.

FIG. 15 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

1, 21, 41, 61, 81, 91, 111, 131,
151, 171, 191, 201, 211 ... Electronic control unit (ECU) 3, 43, 63, 93, 129, 147, 155 ... Electronic component 5, 23, 45, 65, 83, 95, 115, 149,
157, 223 ... Printed circuit boards 7, 25, 51, 71, 85, 101, 113, 13
3, 159, 221 ··· Housing 9, 53, 73, 103, 125, 141, 161, 2
17 ... Connectors 11, 29, 47, 67, 89, 97, 119, 135
..Cases 13, 27, 49, 69, 87, 99, 117, 143
..Covers 17, 33, 57, 75, 107, 123, 139, 2
19 ... Side wall 19, 31, 55, 77, 89, 105, 121, 13
7, 169, 177, 197, 207 ... Ceiling portions 19a, 31a, 55a, 77a, 89a, 105a,
121a, 137a, 169a, 177a, 197a,
207a .. Ceiling surface 13b, 57b, 89b, 107b, 177b .. Outer surface 127 .. Float material 145a, 145b .. Drainage holes 153, 173, 193, 203, 213 .. 175, 195, 205 ... Lid 215 ... Connection part

Claims (15)

[Claims] 1. When a case accommodating a printed circuit board on which electronic components are mounted is attached to a mounting object such as a vehicle body,
In a housing structure of an electronic control device in which the printed circuit board is horizontal or vertical, of the upper inner surface when the housing is attached,
A housing structure for an electronic control device, wherein at least an inner side surface corresponding to a region for preventing the dew condensation water from dropping is inclined with respect to the horizontal. 2. A housing structure of an electronic control device, wherein the housing is horizontal or vertical when the housing housing the electronic components is attached to a mounting target such as a vehicle body, and Of the inner surface in the upward direction,
A housing structure for an electronic control device, wherein at least an inner side surface corresponding to a region for preventing the dew condensation water from dropping is inclined with respect to the horizontal. 3. The casing structure for an electronic control device according to claim 1, wherein the upper inner surface when the casing is attached does not have a horizontal plane. 4. The electronic control device according to claim 1, wherein an inner side surface of the housing, which corresponds to at least a region for preventing the dew condensation water from dropping, is an inclined flat surface. Case structure. 5. The electronic control device according to claim 1, wherein an inner side surface of the housing, which corresponds to at least the area for preventing the dew condensation water from dropping, is a curved surface. Case structure. 6. The apparatus according to claim 1, wherein an outer side surface in an upward direction when the housing is attached is configured to be horizontal when the housing is placed on a horizontal plane.
6. The housing structure of the electronic control device according to any one of 5 above. 7. The float material is arranged between the printed circuit board and the floor side of the housing to form a gap serving as a flow path of the condensed water, according to any one of claims 1 to 6. A housing structure of the electronic control device according to claim 1. 8. The water drainage hole for draining the dew condensation water to the outside of the housing is formed in the housing.
The casing structure of the electronic control device according to any one of 1 to 7. 9. An inner casing that accommodates a printed circuit board on which electronic components are mounted, and a protective box that is an outer casing that accommodates the inner casing, and the protective box is attached to a vehicle body or the like. In the housing structure of the electronic control device in which the printed circuit board is horizontal or vertical when mounted on the inside of the protective box, at least an area of the upward inner surface when the protective box is mounted corresponds to an area where condensation water is prevented from dripping. A housing structure for an electronic control device, wherein an inner surface of the electronic control device is inclined with respect to the horizontal. 10. An inner housing housing electronic components, and a protection box that is an outer housing housing the inner housing. When the protection box is attached to a mounting target such as a vehicle body. In the housing structure of the electronic control device in which the protection box is horizontal or vertical, at least the inner side surface corresponding to a region for preventing the dripping of the dew condensation water among the inner side surfaces in the upward direction when the protection box is attached, A housing structure for an electronic control device, which is inclined with respect to the horizontal. 11. The housing structure for an electronic control device according to claim 9, wherein the protection box has no horizontal plane on the inner surface in the upward direction when the protection box is attached. 12. The electronic control device according to claim 9, wherein an inner side surface of the protection box, which corresponds to at least the area where the dew condensation water is prevented from dropping, is an inclined flat surface. Case structure. 13. The electronic control device according to claim 9, wherein an inner side surface of the protection box, which corresponds to at least the area where the dew condensation water is prevented from dropping, is a curved surface. Case structure. 14. The outer surface in the upward direction when the protection box is attached is configured to be horizontal when the protection box is placed on a horizontal plane. The casing structure of the electronic control device according to any one of 1. 15. The inner housing and the protection box are connected by a connecting portion, and the opening or gap of the inner housing is arranged above the connecting portion at the time of mounting. The casing structure of the electronic control device according to any one of claims 9 to 14.