JP3119143B2 - Electronic control unit storage box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for an electronic control unit. The present invention relates to a storage box for storing an electronic control unit used for a lock brake control device or the like.

[0002]

2. Description of the Related Art Conventionally, an automobile may include an electronic control unit (ECU) used for an electronic fuel injection device (EFI) of an engine, an antilock brake control device (ABS), and the like. As shown in FIG.
U <b> 1 is arranged in the cabin 2 a of the automobile 2. This is E
When the CU 1 is placed in the engine room 2b, the ECU 1 may be affected by heat because the inside of the engine room 2b is under a high temperature atmosphere. This is because there is a risk of infiltration into the air.

However, when the ECU 1 for controlling the engine such as the EFI is disposed in the vehicle compartment 2a, it is necessary to route the wire harness W from the engine room 2b to the vehicle compartment 2a. In addition, the wire harness W needs to be inserted through a hole in the vehicle body panel 2c that separates the vehicle compartment 2a and the engine compartment 2b, which is troublesome and costly.

On the other hand, Japanese Unexamined Utility Model Publication No. 63-55733 proposes an electric connection box 5 shown in FIGS. 5 and 6 which can discharge the heat inside the electric connection box to the outside.
The electric connection box 5 includes an upper case 6 and a lower case 9, and bulges a required position of an outer peripheral wall 6 a of the upper case 6 outward. 8 and a plurality of ribs 6 on the inner peripheral surface of the outer peripheral wall 2a.
b is protruding. In the electric junction box 5, between the inner surface of the outer peripheral wall 6 a of the upper case 6 and the outer peripheral surface of the lower case 9
An air passage 10 meandering around the rib 6b from the intake port 7 to the exhaust port 8 is formed.

[0005]

However, in the electric junction box 1, there is a possibility that moisture may be generated inside from the intake port 7 and the exhaust port 8 in the open state. It is not suitable to be placed in the engine room 2b to be covered.

Further, since the electric connection box 5 has only the intake port 7 and the exhaust port 8 on the outer peripheral wall 6a of the case 6, when the electric connection box 5 is installed in the engine room 2b under a high-temperature atmosphere, the intake port 7 There is a risk that high-temperature air will flow in instead of cold air from 7 and the internal temperature will rise,
Cooling cannot be achieved. Therefore, the electric connection box 5
The engine room 2b
It is impossible to prevent the temperature of the ECU 1 disposed inside the ECU 1 from rising and to make the ECU 1 waterproof.

[0007] For example, Japanese Utility Model Laid-Open No. 3-127428 discloses a structure in which a cover is put on an electric connection box arranged in an engine room, and a ventilation duct is connected to the cover to prevent a rise in the temperature of the electric connection box. Is disclosed. However, even with such a structure, it is not possible to prevent intrusion of moisture during high-pressure car washing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and can prevent the transfer of heat to the ECU even in a high-temperature atmosphere and can provide a waterproof. The object of the present invention is to provide a housing box of an electronic control device which is excellent in easiness and suitable for being arranged in the engine room 2.

[0009]

SUMMARY OF THE INVENTION Accordingly, a first aspect of the present invention provides a housing box body having an inner box portion for housing an electronic control unit and an outer box portion surrounding the inner box portion with a gap for heat radiation. A lid for closing the upper surface of the storage box body, wherein the lid includes:
An outer seal frame is provided along the outer periphery into which the upper end of the outer box is inserted, and the upper end of the inner box is inserted into an inner periphery having a required dimension with respect to the outer seal frame. The present invention provides a housing for an electronic control unit having a double seal structure by providing an inner peripheral seal frame portion provided and packing members disposed at the bottoms of the outer peripheral seal frame portion and the inner peripheral seal frame portion, respectively.

In the housing of the electronic control unit according to the first aspect of the present invention, the outer peripheral frame and the inner peripheral frame having the packing members are provided on the lid as described above, and the outer peripheral frame and the inner peripheral seal are provided. Since the outer box and the upper end of the inner box of the housing box housing the electronic control unit are inserted into the frame and the upper part of the inner box, moisture is injected into the housing box main body from the joint between the housing box main body and the lid. Intrusion can be reliably prevented.

In the storage box of the electronic control unit according to the first aspect, the storage box main body includes an inner box part that stores the electronic control unit, and an outer box part that surrounds the inner box part with a gap for heat radiation. Due to the structure, it is possible to prevent heat in the engine room from being transmitted to the electronic control unit.

[0012]

Next, an embodiment of the present invention shown in the drawings will be described. A storage box 1 of an electronic control unit (ECU) 1 according to the embodiment of the present invention shown in FIGS. 1 and 2.
2 is an engine room 2 of the automobile 2 as shown in FIG.
b.

The storage box 12 is made of resin and has a first
The housing box body 16 including the box body 14 and the second box body 15 and the lid 1
7 is provided.

The first box 14 includes an inner box 20 in which the ECU 1 is housed, and an outer box 21 surrounding the upper part of the inner box 20. The inner box portion 20 of the first box body 14 has a rectangular parallelepiped shape having an opening 20a on the upper surface side, and includes two pairs of side walls 23a and 23b and side walls 24a and 24b facing each other, and a bottom wall 25. ing. The length of the side walls 23a to 24b of the inner box 20 in the vertical direction in the drawing is set so that the housing 1a of the ECU 1 can be fitted and housed in the housing portion 20b formed by the side walls 23a to 24b and the bottom wall 25. ing.

The outer box portion 21 of the first box body 14 has two pairs of side walls 27a, 27b and a side wall 28 provided at intervals from the side walls 23a to 24b of the inner box body 20, respectively.
a, 28b. Side walls 27a-2 of outer box 21
8b are formed on the side walls 23a to 24b of the inner box 20.
Is located above the lower end of the inner box 20, and only the upper part of the inner box 20 is formed by the outer box 21 having a required first heat dissipation gap 32 </ b> A.
Open around. Also, the outer box 21 has a lower end portion of the side wall 27a-28b and a side wall 23a of the inner box portion 21.
-24b are connected to the outer periphery of the bottom wall 30b. The bottom wall 30 is partially provided with an opening 30a,
The first heat radiation gap 32A communicates with the inside 15b of the second box 15 described later.

On the right side wall 27b of the outer box 21 in FIG. 1, cutouts 33A and 33B for attaching a U-shaped grommet are provided.
Is provided. A gutter-like portion 34 protruding outward from the side wall 27b protrudes from the outer periphery of each of the notches 33A and 33B, and the gutter-like portion 34 has a large-diameter portion 55 of a grommet 55.
The grooves 34a and 34b into which the holes a and 55b are fitted are provided.

Further, the bottom wall 30 of the outer box portion 21 is
A rectangular flat flange-like portion 36 is formed so as to protrude outward from 7b.

The left side wall 27a of the outer box 21 in FIG.
Is provided with an exhaust port 40. This exhaust port 40
Is a circular opening 40a penetrating the side wall 27a in the thickness direction.
And the side wall 27 surrounding the periphery of the opening 40a.
and a cylindrical portion 40b protruding from a. This exhaust port 4
To 0, one end of the exhaust pipe 42 is connected. Exhaust pipe 42
The other end is opened near the radiator fan 44, and when the fan 44 rotates, air is sucked from the exhaust pipe 42.

The second box 15 has a rectangular parallelepiped shape having an opening 15a on the upper side in the figure, and includes two pairs of side walls 46a, 46b and side walls 47a, 47b facing each other, and a bottom wall 48. ing. The second box 15 is provided with the side wall 4.
6a to 47b and the inside 15b surrounded by the bottom wall 48,
The lower side of the inner box portion 20 of the first box body 14 is inserted and arranged, and the side walls 23a to 23b and the bottom wall 25 of the inner box portion 20 are inserted.
And the side walls 46a to 47b and the bottom wall 48 of the second box body 15.
Are set so that the second heat-dissipating gap 32B is formed between them.

The right side wall 47 of the second box 15 shown in FIG.
b has an inlet 52. This inlet 52
Is a circular opening 52a penetrating the side wall 47b in the thickness direction.
And a side wall 47 surrounding the periphery of the opening 52a.
b, and a cylindrical portion 52b protruding from b. One end of an intake pipe 53 (only shown in FIG. 3) is connected to the intake port 52. The other end of the intake pipe 53 communicates with the outside of the vehicle 2.

On the other hand, the right side wall 4 of the second box body 15 in FIG.
At the upper end of 6b, a flange-like portion 54 made of a rectangular plate protruding outward in the horizontal direction is provided. The flange-like portion 54 has substantially the same shape as the flange-like portion 36 provided on the outer box portion 21 of the first box body 14, and as shown in FIG. They can be superimposed closely.

The lower portion of the second box 15 is provided with a bracket portion 56 having a bolt hole 56a at the tip. By inserting a bolt into the bolt hole 56a, the housing box 12 is mounted on the vehicle. Of the vehicle body (not shown).

As described above, the first heat radiation gap 32A is formed between the inner box part 20 of the first box body 14 and the side walls 23a to 24b and 46a to 47b of the outer box part 21. The side walls 46a to 47b of the second box 15 are continuous with the lower ends of the side walls 27a to 28b of the outer box 21 of the first box 14, and the inner box 20 of the first box 14 Side wall 23a
A second heat-dissipating gap 32B is formed between the lower side and the bottom wall 28 of the second box 15 and the side walls 46a to 47b and the bottom wall 48 of the second box body 15. Also, as described above, the bottom wall 30 of the outer box 21 of the first box 14 has an opening 30a.
Is provided, the first heat radiation gap 32A and the second heat radiation gap 32B communicate with each other.

The lid 17 has an opening 17 at the lower side in FIG.
a is a thin rectangular rectangular parallelepiped,
6, when attached to the opening 13a on the upper surface side of the grommet 55, the annular outer periphery is fitted to the upper end of the outer box 21 of the first box 14 and the seal 55c of the grommet 55 disposed on the gutter 34. The seal frame 57 is provided along the outer periphery on the inner surface side. The outer peripheral seal frame portion 57 includes a pair of opposing guide wall portions 57a and 57b, and the guide wall portions 57a and 57b.
The first packing member 58 is inserted into the bottom of the groove 57c formed therebetween. The packing member 58 is an annular body having a rectangular cross section made of an elastic material such as rubber.

Further, an annular inner peripheral seal frame 59 is provided on the inner surface of the inner surface of the lid 17 at a predetermined distance from the outer peripheral seal frame 57. This inner peripheral seal frame 59
Is fitted to the upper end of the inner box portion 20 of the first box body 14 and the large-diameter portion 55 d of the grommet 55 when attached to the upper opening of the housing box body 16. This inner peripheral seal frame 59
Has a pair of opposed wall portions 59a and 59b, like the outer peripheral seal frame portion 57, and the second packing member 6 is provided at the bottom of a groove 59c formed between the wall portions 59a and 59b.
1 is inserted. Like the first packing member 58, the second packing member 61 is also an annular body having a rectangular cross section made of an elastic material such as rubber.

The ECU 1 is housed in the housing section 20b of the inner box section 20 of the first box body 14 with the lid 17 removed from the housing box body 16. In FIG. 1, 63a and 63b are connectors connected to the connected parts 1b and 1c provided in the ECU 1. An electric wire 6 having the connectors 63a and 63b at the ends.
Grommets 55 attached to the notches 33A and 33B are mounted on 4A and 64B. This grommet 55
Is provided with large-diameter portions 55a and 55b, and a seal portion 55c inserted into the groove 57c of the outer peripheral seal frame 57;
A seal portion 55d is provided to be inserted into the groove 59c of the inner peripheral seal frame 59. The grommet 55 is provided with the large diameter portion 5.
5a and 55b are arranged in the gutter-like portion 34 in a state housed in the grooves 34a and 34b, and the electric wires 64A and 64B are drawn out through the cutouts 33A and 33B.

As described above, the ECU 1 is housed in the inner box portion 20 of the first box body 14 and the electric wires 6 connected to the ECU 1
The upper surface of the housing box main body 16 is closed with the lid 17 in a state where 4a and 64b are pulled out from the cutout portions 33A and 33B. At this time, as described above, the outer box 21 of the first box 14
And the sealing portion 55c of the grommet 55 is inserted into the groove 57a of the outer peripheral sealing frame portion 57, and abuts on the first packing member 58 in a state of being in close contact with the upper end of the inner box portion 20 of the first box body 14. Seal part 55 of grommet 55
d is inserted into the groove 59c of the inner peripheral seal frame 59, and the second
Abuts in close contact with the packing member 61. Therefore, the inside of the housing box body 16 is double-sealed by the first and second packing members 58 and 61, thereby reliably preventing moisture from entering the inside from between the lid 17 and the housing box body 16. can do.

As described above, the first heat radiation gap 32A is formed between the inner box part 20 of the first box body 14 and the side walls 23a to 24b and 27a to 28b of the outer box part 21. Further, the side walls 46a to 47b of the second box 15 are formed so as to be continuous with the lower ends of the side walls 27a to 28b of the outer box portion 21 of the first box 14, and the inside of the first box 14 is formed. Box part 2
0 between the lower portion and the bottom wall 25 of the side walls 23a to 24b and the side walls 46a to 47b and the bottom wall 48 of the second box body 15.
A second heat radiation gap 32B is formed. These first
And the second heat radiation gaps 32A, 32B
communicate with each other through a. Therefore, the engine 10
During operation of the radiator fan 44,
While the air in the first and second heat radiation gaps 32A and 32B is discharged through the discharge port 40, the air outside the vehicle is discharged from the intake port 52 to the first and second heat radiation gaps 32A and 32B.
32B. Therefore, the periphery of the inner box 20 in which the ECU 1 is accommodated is cooled by the air circulation, so that the heat in the engine room 2b can be prevented from being transmitted to the ECU 1.

[0029]

As is apparent from the above description, in the housing of the electronic control unit according to the first aspect, the outer peripheral seal frame and the inner peripheral seal frame each having the packing member disposed on the lid are provided. Since the outer box portion and the upper end portion of the inner box portion of the housing box body containing the electronic control unit are inserted into the frame portion and the inner peripheral seal frame portion, the joining portion of the housing box body and the lid is formed. Is securely sealed, and the inside of the storage box is highly sealed. Therefore, for example, even if the storage box arranged in the engine room is exposed to moisture during high-pressure car washing or the like, it is possible to reliably prevent the water from entering the storage box and reaching the electronic control unit. be able to. In the storage box of the electronic control unit according to the first aspect,
Since the housing box body has an inner box part that houses the electronic control unit and an outer box part that surrounds the inner box part with a clearance for heat radiation, heat in the engine room is transmitted to the electronic control unit. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a storage box of an electronic control unit according to the present invention.

FIG. 2 is a schematic exploded perspective view showing a storage box of the electronic control unit according to the present invention.

FIG. 3 is a schematic diagram showing an arrangement position of a storage box of the electronic control unit.

FIG. 4 is a schematic view showing a mounting position of a conventional ECU.

FIG. 5 is an exploded perspective view showing an example of a conventional electronic control device.

FIG. 6 is a perspective view showing an example of a conventional electronic control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic control unit (ECU) 14 1st box 15 Second box 16 Housing main body 17 Lid 20 Inner box 21 Outer box 32A, 32B Heat dissipation gap 38, 45 Projection 55 Grommet 57 Outer peripheral seal frame 59 Perimeter seal frame

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 3/14 B60R 16/02 H02G 3/16 H05K 5/02

Claims (1)

(57) [Claims] 1. A housing box main body including an inner box part for housing an electronic control unit and an outer box part surrounding the inner box part with a heat radiation gap, and a lid for closing an upper surface of the housing box main body. The lid is provided with an outer peripheral seal frame portion along which the upper end of the outer box portion is inserted along its outer periphery, and an inner periphery having a required dimension with respect to the outer peripheral seal frame portion, An electronic control unit having a double seal structure in which an inner peripheral seal frame portion into which the upper end portion of the inner box portion is inserted is provided, and a packing member is arranged at each of the outer peripheral seal frame portion and the bottom portion of the inner peripheral seal frame portion. Accommodation box.