JPH09207691A - Electronic component cooling structure - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To prevent dust, water, and the like contained in cooling air from adhering to electronic components and terminals housed in an electrobox. SOLUTION: A main body 26 of an electro box 10 has a double structure having an outer box part 28 and an inner box part 30, and an electronic control circuit 44 is housed in a ventilation box 48 in the inner box part 30. There is. A seal packing 52 is provided between the inner box part 30 and the ventilation box 48, and an air passage 54 is formed between the inner box part 30 and the ventilation box 48. A cooling air intake 56 and a cooling air intake 58 are formed in the air passage 54. The outer box part 28 is closed by a lid 60,
A seal packing 64 is provided between the cover 60 and the lid 60. Therefore, the outside air in the engine room and the cooling air flowing in the air passage 54 are prevented from flowing into the ventilation box 48.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a cooling structure for electronic components, and more particularly to a cooling structure for electronic components mounted in an engine room of a vehicle.

[0002]

2. Description of the Related Art Conventionally, dust,
In order to protect it from water and the like, some are mounted in an engine room while being housed in a so-called electro box. Further, a cooling structure for preventing a temperature rise of the electronic control circuit housed in the electro box is known, and an example thereof is an actual flat panel 3-
No. 127428.

As shown in FIG. 7, in this electronic component cooling structure, an intake duct 172 and an exhaust duct 1 are provided inside an electro box 170 mounted in an engine room.
Low-temperature outside air directly flows in through 74, and the cooling air indicated by the arrow in the drawing suppresses the rise in the internal temperature of the electro box 170, and the electronic components 176 housed in the electro box 170 are suppressed. The temperature rise of the terminals 178 is suppressed.

[0004]

However, in this electronic component cooling structure, the outside air flowing into the electronic box 170 from the intake duct 172 is supplied to the electronic component 176 and the terminal 1 contained in the electronic box 170.
78 directly hits. For this reason, when the cooling air flowing into the inside of the electronic box 170 from the intake duct 172 includes dust, water, and the like, the dust, water, and the like are contained in the electronic components 176 and There is a possibility of sticking to the terminal 178.

In consideration of the above facts, the present invention provides a cooling structure for electronic components which can prevent dust, water, etc. contained in the cooling air from adhering to the electronic components and terminals housed in the electrobox. With the goal.

[0006]

According to a first aspect of the present invention, an electronic control circuit electrically connected to a wire harness is housed and mounted in an engine room, and a wall portion of the electronic harness is formed by the wire harness. In a cooling structure for an electronic component having an electrobox penetrating via a grommet, a main body of the electrobox, a lid closing the main body via a first sealing means, the electronic control circuit are mounted, and a second By assembling in the main body via the sealing means, an inner box forming an air passage surrounding the electronic control circuit so that the cooling air does not come into direct contact with the electronic control circuit, and a cooling in the air passage. It is characterized in that it is provided with a cooling air intake for taking in air and a cooling air intake for taking out cooling air from the air passage.

Therefore, the cooling air that has entered from the cooling air intake port flows through the air passage that surrounds the electronic control circuit, and exits from the cooling air intake port. At that time, the cooling air flowing in the air passage does not come into direct contact with the electronic control circuit by the first sealing means and the second sealing means.

According to the second aspect of the present invention, the electronic control circuit electrically connected to the wire harness is housed and mounted in the engine room, and the wall part of the wire harness penetrates through the grommet. In a cooling structure for an electronic component having an electrobox, a main body of the electrobox, a lid for closing the main body via a first sealing means, the electronic control circuit are mounted, and the lid is closed via a second sealing means. Provided in the main body are an inner box that engages with the main body to form an air passage surrounding the electronic control circuit so that the cooling air does not come into direct contact with the electronic control circuit. A cooling air intake opening for introducing cooling air into the air passage, and a cooling air intake opening provided in the main body for taking out cooling air from the air passage. That.

Therefore, the cooling air that has entered from the cooling air intake port flows through the air passage that surrounds the electronic control circuit formed by the inner box and the main body, and exits from the cooling air intake port. At that time, the cooling air flowing in the air passage is supplied to the first sealing means and the second sealing means.
There is no direct contact with the electronic control circuit due to the sealing means.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a cooling structure for electronic parts according to the present invention will be described with reference to FIGS.

In each of the drawings, an arrow FR is shown in front of the vehicle.
, The upper part of the vehicle is indicated by an arrow UP, and the inner side in the vehicle width direction is indicated by an arrow IN.

As shown in FIG. 4, in the electronic component cooling structure of the first embodiment, the electro box 10 is mounted in the engine room 14 of the vehicle 12, and the intake duct connected to the electro box 10 is installed. 16 reaches the vicinity of the lower end portion of the front bumper 18, and the outside air flowing under the front bumper 18 is guided into the electro box 10 by the intake duct 16.

As shown in FIG. 3, the electrobox 10 is disposed laterally of the engine 20. The exhaust duct 22 connected to the electronic box 10 reaches near the front side of the cooling fan 24A of the radiator 24,
Utilizing the negative pressure near the front side of the cooling fan 24A, the cooling air in the electronic box 10 is forcibly exhausted through the exhaust duct 22.

As shown in FIG. 1, the main body 26 of the electrobox 10 has a double structure having an outer box portion 28 and an inner box portion 30 which are open at the upper side. The bottom part 30A of the inner box part 30 is deeper than the bottom part 28A of the outer box part 28, and the wire harness 36 Is penetrating.

As shown in FIG. 2, a through hole (not shown) is also formed in the rear side wall portion 28B of the outer box portion 28, and a wire harness grommet 35 is also provided in this through hole.
The wire harness 37 penetrates. These wire harnesses 36 and 37 are connected to a wire harness 42 via electric components 38 and 40 such as relays. The wire harness 42 is connected to a connector 46 provided on an upper surface of an electronic control circuit 44. Have been.

The electronic control circuit 44 is provided in the inner box portion 3 of the main body 26.
It is housed in a ventilation box 48 as an inner box housed in 0, and the ventilation box 48 is open at the top. Ventilation box 4
In the outer periphery near the opening of 8, the flange portion 4 faces outward.
8A is formed, and on the lower surface side of the flange portion 48A, a groove 50 that goes around the outer circumference along the flange portion 48A.
Are formed. A seal packing 52 as a second sealing means is fitted in the groove 50.

As shown in FIG. 1, the upper edge 30B of the inner box portion 30 of the main body 26 is inserted into the groove 50 formed in the flange portion 48A of the ventilation box 48. Further, the bottom portion 48B of the ventilation box 48 is held by the positioning projection 30B formed on the bottom portion 30A of the inner box portion 30, and in this state, the space between the upper end edge portion 30B of the inner box portion 30 and the groove 50 is held. It is sealed with a seal packing 52. Therefore, the inner box portion 30 and the ventilation box 48 form an air passage 54 along the side wall portion of the ventilation box 48.

A cooling air intake 56 is formed at the lower front portion of the outer side wall portion 30C of the inner box portion 30 in the vehicle width direction.
The intake duct 16 is connected to the cooling air intake 56. A cooling air outlet 58 is formed so as to project from the front upper portion of the inner wall portion 30D of the inner box portion 30 in the vehicle width direction, and the exhaust duct 22 is connected to the cooling air outlet 58. Therefore, the cooling air (arrow in FIG. 1) that has flowed into the air passage 54 from the cooling air intake 56 flows along the air passage 54 and is exhausted from the cooling air intake 58.

The opening of the outer box portion 28 is closed by a lid 60. The lid 60 has a dish shape with the opening directed downward, and the opening edge 60 </ b> A has a groove 6 that goes around the opening.
2 are formed. A seal packing 64 as a first sealing means is fitted in the groove 62. Further, in the groove 62, the upper edge portion 28 of the outer box portion 28 of the main body 26 is
C is inserted, and a seal packing 64 seals between the upper edge 28C of the outer box portion 28 and the groove 62.
Therefore, the outside air in the engine room 14 and the cooling air flowing in the air passage 54 contain electronic components including the ventilation box 48 formed by the lid 60, the outer box portion 28, the inner box portion 30, and the ventilation box 48. It does not flow into the portion 66.

Next, the operation of the first embodiment will be described.
In the electronic component cooling structure according to the first embodiment, the outside air flowing under the front bumper 18 is supplied to the intake duct 16 by the intake duct 16.
The radiator 2 is guided into the electro box 10 and
The cooling air in the electronic box 10 is forcibly exhausted through the exhaust duct 22 by using the negative pressure near the front side of the cooling fan 24A.

The cooling air which has flowed into the air passage 54 from the cooling air intake 56 is shown in FIG.
The air flows through the air passage 54 formed along the side wall of the cooling air outlet and is discharged from the cooling air outlet 58. Therefore, since the side wall of the ventilation box 48 is efficiently cooled by the cooling air, the ventilation box 4
It is possible to efficiently cool the electronic control circuit 44 mounted in the unit 8.

The cooling air also cools the outer peripheral portion of the inner box portion 30 and the flange portion 48A of the ventilation box 48, so that the electric components 3 arranged in the electronic component housing portion 66 are cooled.
8, 40 can also be cooled.

Further, in the cooling structure for electronic parts according to the first embodiment, the seal packings 52 and 64 allow the outside air in the engine room 14 and the cooling air flowing in the air passage 54 to move to the lid 60 and the outer box portion 28. Since it does not flow into the electronic component storage portion 66 including the inside of the ventilation box 48 formed by the inner box portion 30 and the ventilation box 48, dust, water, etc. contained in the outside air and the cooling air are contained in the electrobox 10. It is possible to prevent the electronic control circuit 44 and the electric components 38, 40 housed therein from being attached. Further, it is not necessary to provide a cooling air passage separately from the electro box 10, and the productivity is improved.

Further, in the cooling structure for electronic parts according to the first embodiment, the exhaust duct 22 connected to the electro box 10 is extended near the front side of the cooling fan 24A of the radiator 24, and near the front side of the cooling fan 24A. The cooling effect is improved because the cooling air in the electrobox 10 is forcibly exhausted by utilizing the negative pressure of.

In order to further improve the waterproof and dustproof characteristics, welding is performed in place of the seal packings 52 and 64.
Adhesion or the like may be performed.

Next, the second cooling structure for electronic parts of the present invention
The embodiment will be described with reference to FIGS. 5 and 6.

The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 5, the main body 72 of the electro box 70 has a shallow bottom portion 74 having a shallow bottom and a deep bottom portion 76 deeper than the bottom portion 74A of the shallow bottom portion 74. It has a two-stage structure. Through the wire harness grommet 34, the wire harness 3 is inserted into the through hole 32 formed in the bottom portion 74A of the shallow bottom portion 74.
6 penetrates.

As shown in FIG. 6, a through hole (not shown) is also formed in the rear side wall portion 74B of the shallow bottom portion 74, and the through hole is also provided with the wire harness grommet 35.
The wire harness 37 penetrates. These wire harnesses 36, 37 are connected to a wire harness 42 via electric parts 38, 40, and this wire harness 42 is connected to a connector 46 arranged on the upper surface of an electronic control circuit 44. .

The electronic control circuit 44 includes a deep bottom portion 7 of the main body 72.
6 is housed in a ventilation box 78 serving as an inner box, and the ventilation box 78 has a double structure having an inner box portion 80 and an outer box portion 82. The inner box part 80 is open at the upper side, and the outer box part 82 is a closed structure between the side wall part 80A and the lower wall part 80B of the inner box part 80 except for a cooling air intake and a cooling air intake which will be described later. The air passage 84 is formed. Further, a cooling air intake 86 is formed at a lower front portion of the outer side wall portion 82A of the outer case portion 82 in the vehicle width direction.
A cooling air outlet 88 is formed in a projecting manner at the upper front portion of the vehicle inner wall portion 82B in the vehicle width direction.

As shown in FIG. 5, the deep bottom portion 7 of the body 72 is
A through hole 88 is formed in a portion of the outer wall portion 76 </ b> A of the vehicle width direction facing the cooling air intake 86, and the cooling air intake 86 is inserted into the through hole 88. A space between the through hole 88 and the cooling air intake 86 is sealed by a seal packing 90 as a second sealing means. In the vehicle width direction inner side wall portion 76B of the deep bottom portion 76, a through hole 100 is formed at a portion facing the cooling air outlet 88, and the cooling air outlet 88 is inserted into the through hole 100. ing. Between the through hole 100 and the cooling air outlet 88, the second
It is sealed with a seal packing 102 as a sealing means.

The intake duct 16 is connected to the cooling air intake port 86, and the exhaust duct 22 is connected to the cooling air intake port 88. Therefore, from the cooling air intake 86 to the air passage 8
The cooling air (arrows in FIG. 5) that has flowed into the cooling water 4 flows along the air passage 84 and is exhausted from the cooling air outlet 88.

The opening of the shallow bottom portion 74 of the main body 72 is covered by the lid 60.
Is closed. The lid 60 is shaped like a dish with the opening facing downward, and the opening edge 60A is formed with a groove 62 that makes one round along the opening. A seal packing 64 is fitted in the groove 62. Further, the upper end edge portion 72A of the main body 72 is inserted into the groove 62, and a seal packing 64 seals between the upper end edge portion 72A of the main body 72 and the groove 62. Therefore, the engine room 14
The outside air inside and the cooling air flowing through the air passage 84 are prevented from flowing into the electronic component storage portion 104 including the inside box portion 80 formed by the lid 60, the main body 72, and the ventilation box 78. .

Next, the operation of the second embodiment will be described.
In the cooling structure for the electronic component of the second embodiment, the cooling air that has flowed into the air passage 84 from the cooling air intake 86 is the side wall portion of the inner box portion 80 of the ventilation box 78 as indicated by the arrow in FIG. The air flows in the air passage 84 formed along the line and is forcibly exhausted from the cooling air intake port 88. Therefore, since the side wall portion of the inner box portion 80 is efficiently cooled by the cooling air, the inner box portion 80
The electronic control circuit 44 mounted therein can be cooled efficiently.

Since the cooling air also cools the outer peripheral portion of the outer box portion 82 of the ventilation box 78, the electric components 38 and 40 arranged in the electronic component housing portion 104 can also be cooled.

Further, in the cooling structure for electronic parts according to the second embodiment, the seal packings 62, 90 and 102 allow
The outside air in the engine room 14 and the cooling air flowing in the air passage 84 do not flow into the electronic component storage portion 104 including the inner box portion 80 formed by the lid 60, the main body 72, and the ventilation box 78. Therefore, dust contained in the outside air and cooling air,
It is possible to prevent water and the like from adhering to the electronic control circuit 44 and the electric components 38 and 40 housed in the electro box 70. Further, it is not necessary to provide a cooling air passage separately from the electro box 70, and the productivity is improved.

In order to further improve the waterproof property and the dustproof property, welding or bonding may be performed instead of the seal packings 90 and 102.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are included in the scope of the present invention. It is clear to a person skilled in the art that is possible.

[0039]

According to the first aspect of the present invention, the electronic control circuit electrically connected to the wire harness is housed and mounted in the engine compartment, and the wall of the electronic control circuit is connected to the wire harness via the grommet. In a cooling structure for an electronic component having a penetrating electro box, a main body of the electro box, a lid for closing the main body via a first sealing means, an electronic control circuit are mounted, and an inside of the main body is mounted via a second sealing means. The inner box that forms the air passage that surrounds the electronic control circuit so that the cooling air does not come into direct contact with the electronic control circuit, the cooling air inlet that takes the cooling air into the air passage, and the air passage Since it has a cooling air outlet that takes out cooling air from the device, dust, water, etc. contained in the cooling air will adhere to the electronic components and terminals contained in the electro box. It is possible to prevent the, has an excellent effect of electro boxes and productivity is not necessary to provide a cooling air path to another member is improved.

According to a second aspect of the present invention, the electronic control circuit electrically connected to the wire harness is housed and mounted in the engine room, and the wall portion of the electronic harness penetrates through the grommet. In a cooling structure for an electronic component having an electrobox, a main body of the electrobox, a lid for closing the main body via a first sealing means, an electronic control circuit are mounted, and an electronic control circuit is mounted inside the main body via a second sealing means. By combining, the inner box that forms the air passage that surrounds the electronic control circuit so that the cooling air does not come into direct contact with the electronic control circuit, and the cooling that takes cooling air into the air passage provided in the main body Since the air intake is provided and the cooling air intake is provided in the main body to take out the cooling air from the air passage, dust, water, etc. contained in the cooling air are contained in the electrobox. With matches was prevented from adhering to the electronic components and terminals to have an excellent effect of electro boxes and productivity is not necessary to provide a cooling air path to another member is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a cooling structure for electronic components according to a first embodiment of the present invention, as viewed from the rear of a vehicle.

FIG. 2 is a perspective view of the cooling structure for electronic components according to the first exemplary embodiment of the present invention as seen from the diagonally rearward outside of the vehicle.

FIG. 3 is a schematic plan view showing an engine room of a vehicle to which the electronic component cooling structure according to the first exemplary embodiment of the present invention is applied.

FIG. 4 is a schematic side view showing an engine room of a vehicle to which the electronic component cooling structure according to the first exemplary embodiment of the present invention is applied.

FIG. 5 is a sectional view showing a cooling structure for electronic components according to a second embodiment of the present invention, as seen from the rear of the vehicle.

FIG. 6 is a perspective view of an electronic component cooling structure according to a second exemplary embodiment of the present invention, as viewed from the diagonally rear outside of the vehicle.

FIG. 7 is a cross-sectional view showing a cooling structure for an electronic component according to a conventional embodiment.

[Explanation of symbols]

 10 Electro Box 14 Engine Room 16 Intake Duct 22 Exhaust Duct 26 Main Body 28 Outer Box Section 30 Inner Box Section 34 Wire Harness Grommet 35 Wire Harness Grommet 36 Wire Harness 37 Wire Harness 38 Electrical Parts 40 Electrical Parts 44 Electronic Control Circuit 48 Ventilation Box ( Inner box 52 Seal packing (second sealing means) 54 Air passage 56 Cooling air intake 58 Cooling air intake 60 Lid 64 Seal packing (first sealing means) 66 Electronic component storage 70 Electro box 72 Main body 74 Shallow Bottom part 76 Deep bottom part 78 Ventilation box (inner box) 80 Inner box part 82 Outer box part 84 Air passage 86 Cooling air intake port 88 Cooling air intake port 90 Seal packing (second sealing means) 102 Seal packing (second seal) Means) 104 electronic component storage section

Claims (2)

[Claims] 1. An electronic component having an electro box in which an electronic control circuit electrically connected to a wire harness is housed and mounted in an engine room, and the wall portion of the electronic control circuit is penetrated by a grommet. In the cooling structure, a main body of the electrobox, a lid for closing the main body via a first sealing means, the electronic control circuit are mounted, and the electronic box is assembled into the main body via a second sealing means. An inner box forming an air passage that surrounds the electronic control circuit so that the cooling air does not come into direct contact with the electronic control circuit; a cooling air intake for taking cooling air into the air passage; A cooling structure for electronic components, comprising: a cooling air outlet for taking out cooling air. 2. An electronic component having an electro box in which an electronic control circuit electrically connected to a wire harness is housed and mounted in an engine room, and the wall portion of the electronic control circuit penetrates through the grommet. In the cooling structure, a main body of the electrobox, a lid that closes the main body via a first sealing means, the electronic control circuit is mounted, and the lid is engaged with the inside of the main body via a second sealing means. With the main body, an inner box forming an air passage surrounding the electronic control circuit so that the cooling air does not come into direct contact with the electronic control circuit, and cooling air is provided to the air passage provided in the main body. A cooling structure for an electronic component, comprising: a cooling air intake that takes in the cooling air; and a cooling air intake that is provided in the main body and takes out the cooling air from the air passage.