JPH11354952A - Electronic unit box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cool an entire electronic unit by locally cooling the heat generation source of the electronic unit. SOLUTION: In an electronic unit, an air layer 40 is formed between an outer primary peripheral wall 11 and an inner secondary peripheral wall 21, as well as an electronic unit 2 with a heat generation source 2a is accommodated in the secondary peripheral wall 21, and the electronic unit 2 is cooled by air that circulates in the air layer 40. In the electronic unit, a part corresponding to the heat generation source 2a of the electronic unit 2 is thinned for forming a thin part 24, and the heat generation source 2a is cooled locally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic unit box for housing an electronic unit for controlling a vehicle electrically, and more particularly to an electronic unit box having a cooling structure for the electronic unit.

[0002]

2. Description of the Related Art An electronic unit for performing electrical control such as fuel injection has a heat source such as a power transistor and an IC therein, and is installed at a high temperature in an engine room. I needed to. Therefore, the present applicant has conventionally proposed various electronic unit boxes provided with a cooling structure.

A conventional electronic unit box having a cooling structure is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-28971.
There is something proposed in No. 9. This electronic unit box will be described with reference to FIGS.

FIG. 8 is an exploded perspective view showing a conventional electronic unit box. FIG. 9 is a longitudinal sectional view of the electronic unit box in a short direction in an assembled state.

[0005] In these drawings, a conventional electronic unit box 100 includes a box body 10 formed of a synthetic resin, a unit storage case 20 separate therefrom,
It comprises a cover 30 for hermetically closing the box body 10.

The box body 10 has a peripheral wall (primary peripheral wall) 11 which forms a rectangular hollow. Two barrier walls 12, 13 are integrally formed inside the peripheral wall 11, and a hood 14 is integrally formed outside. Further, an intake port 11a and an exhaust port 11 communicating with the hollow formed by the peripheral wall 11 are provided.
b is provided.

The unit storage case 20 has a configuration in which a flange-shaped lid 23 is integrally formed on a peripheral wall (secondary peripheral wall) 21 that forms a storage section 22 of the electronic unit 2.

When such a unit storage case 20 is accommodated in the peripheral wall 11 of the box body 10, an air layer 40 is formed between the outer peripheral wall 11 and the inner peripheral wall 21,
The air circulating in the air layer 40 causes the storage portion 22
The electronic unit 2 housed inside is cooled.

Further, in the air space 40, the intake port 11
a and the exhaust port 11b are blocked by the blocking walls 12 and 13, so that cooling air flows from the intake port 11a to the exhaust port 11b.
The electronic unit 2 in the storage section 22 can be efficiently cooled without causing a short circuit to the point b.

[0010]

However, in the conventional electronic unit box 100 described above, the electronic unit 2
Heat source 2a such as a power transistor and an IC constituting the semiconductor device
Is a heat-generating source despite the fact that the entire electronic unit 2 is radiated uniformly.
a of the electronic unit 2 cannot be effectively dissipated.
The overall cooling efficiency was not sufficient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an electronic unit box that can locally radiate a heat source of an electronic unit and efficiently cool the entire electronic unit. I do.

[0012]

In order to achieve the above object, an electronic unit box according to claim 1, wherein an air layer is formed between an outer primary peripheral wall and an inner secondary peripheral wall, An electronic unit box that houses an electronic unit having a heat source in the next peripheral wall and cools the electronic unit by air circulating in the air layer,
A portion of the secondary peripheral wall corresponding to the heat source of the electronic unit is thinned, and the heat source is locally radiated.

According to such a configuration, the heat generated by the heat source is easily radiated to the air layer by partially reducing the thickness of the secondary peripheral wall separating the heat source of the electronic unit and the air layer. . Thus, the heat source of the electronic unit can be locally radiated, and the entire electronic unit can be efficiently cooled.

According to another aspect of the present invention, there is provided an electronic unit box, wherein an air layer is formed between an outer primary peripheral wall and an inner secondary peripheral wall, and a heat source is provided in the secondary peripheral wall. An electronic unit box that stores the electronic unit having: and the air that circulates through the air layer and cools the electronic unit.
Opening a portion corresponding to a heat source of the electronic unit,
The heat source is locally radiated.

According to such a configuration, since the secondary peripheral wall that separates the heat source of the electronic unit from the air layer is partially opened, the heat generated by the heat source is easily radiated by the air layer. . This makes it even more effective
The heat source of the electronic unit can be locally radiated, and the entire electronic unit can be cooled more efficiently.

According to a third aspect of the present invention, in the electronic unit box, an air layer is formed between an outer primary peripheral wall and an inner secondary peripheral wall, and a heat source is provided in the secondary peripheral wall. In the electronic unit box that houses the electronic unit having the above and cools the electronic unit by air circulating in the air layer, the electronic unit box is located between the electronic unit and the secondary peripheral wall, and one end of the electronic unit heats up. A heat conductive member corresponding to the source and having the other end in contact with the secondary peripheral wall is provided, and the heat conductive member locally radiates a heat source of the electronic unit.

According to such a configuration, the heat generated by the heat source of the electronic unit is easily radiated to the secondary peripheral wall forming the air layer via the heat conducting member. This allows
The heat source of the electronic unit can be locally radiated, and the entire electronic unit can be efficiently cooled.

In order to achieve the above object, the electronic unit box according to claim 4 forms an air layer between an outer primary peripheral wall and an inner secondary peripheral wall, and generates a heat source in the secondary peripheral wall. In an electronic unit box that houses an electronic unit having: and cools the electronic unit by air circulating in the air layer, the electronic unit box penetrates the secondary peripheral wall, and one end corresponds to a heat source of the electronic unit. A heat conductive member whose end reaches the air layer is provided, and the heat conductive member locally radiates a heat source of the electronic unit.

According to such a configuration, the heat generated by the heat source of the electronic unit is directly radiated to the air layer via the heat conducting member. Thereby, the heat source of the electronic unit can be most effectively locally radiated, and the entire electronic unit can be cooled most efficiently.

Preferably, the heat conducting member is made of rubber having high heat conductivity.

According to such a configuration, as described above,
The heat source of the electronic unit is locally radiated, and the entire electronic unit can be efficiently cooled, and the heat conductive member is made of rubber, so that the adhesion to the electronic unit can be improved, and The electronic unit can be easily inserted into the secondary peripheral wall.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an electronic unit box according to the present invention will be described with reference to the drawings.
First, an electronic unit box according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is an exploded perspective view showing an electronic unit box according to the first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the electronic unit box in a longitudinal direction in an assembled state.

In the electronic unit box according to the embodiment of the present invention described below, the same parts as those in the related art are denoted by the same reference numerals, and the detailed description is omitted.

In these drawings, an electronic unit box 1 according to the present embodiment hermetically seals a box body 10 made of a synthetic resin, a unit storage case 20 separate from the box body, and a box body 10 as in the prior art. And a cover 30.

The box body 10 has a peripheral wall (primary peripheral wall) 11 forming a rectangular hollow, and the unit storage case 2
Numeral 0 has a peripheral wall (secondary peripheral wall) 21 that forms a storage section 22 of the electronic unit 2. The peripheral wall 11 of the box body 10 and the peripheral wall 2 of the unit storage case 20
1 indicates that the air space 40 is formed when the electronic unit box 1 is assembled.

Here, in the electronic unit box 1 according to the present embodiment, unlike the related art, the unit storage case 20 is provided.
Of the peripheral wall 21 corresponding to the heat sources 2a of the electronic unit 2 are formed.

According to the electronic unit box 1 of the present embodiment having such a configuration, the peripheral wall 21 for separating the heat sources 2a, 2a of the electronic unit 2 from the air layer 40 is partially thinned. The heat generated by the heat sources 2 a is easily radiated to the air layer 40. This allows
The heat sources 2a of the electronic unit 2 can be locally radiated, and the entire electronic unit 2 can be efficiently cooled.

Next, an electronic unit box according to a second embodiment of the present invention will be described with reference to FIGS.

FIG. 3 is an exploded perspective view showing an electronic unit box according to a second embodiment of the present invention. FIG. 4 is a longitudinal sectional view of the electronic unit box in a longitudinal direction in an assembled state.

In these drawings, in the present embodiment, openings 25, 25 are formed in portions of the peripheral wall (secondary peripheral wall) 21 of the unit storage case 20 corresponding to the heat sources 2a, 2a of the electronic unit 2. is there.

According to such a configuration, the electronic unit 2
By partially opening the peripheral wall 21 separating the heat sources 2a, 2a from the air layer 40, the heat sources 2a, 2a
The heat generated by the air layer 40 is easily radiated by the air layer 40.
Thereby, the heat sources 2a, 2a of the electronic unit 2 can be more effectively locally radiated, and the entire electronic unit 2 can be cooled more efficiently.

Next, an electronic unit box according to a third embodiment of the present invention will be described with reference to FIGS.

FIG. 5 is an exploded perspective view showing an electronic unit box according to a third embodiment of the present invention. FIG. 6 is a longitudinal sectional view of the electronic unit box in a short-side direction in a state where the electronic unit box is assembled.

In these drawings, in the present embodiment, in the peripheral wall (secondary peripheral wall) 21 of the unit storage case 20, the peripheral wall 21 penetrates the peripheral wall 21, and one end of the heat source 2 a,
2a, the other end of which reaches the air layer 40.
6 and 26 are provided.

The heat conducting members 26, 26 are formed of rubber having high heat conductivity (so-called heat radiation rubber). As the heat radiating rubber for forming the heat conductive members 26, 26, for example, a mixture of silicon rubber and ceramic (alumina) is used. Such a heat radiating rubber has a thermal conductivity that is about 10 times that of general rubber.

According to such a configuration, the heat conducting member 2
6, 26, the heat sources 2a, 2a of the electronic unit 2
Is directly radiated to the air layer 40. Thereby, the heat sources 2a, 2a of the electronic unit 2 can be most effectively locally radiated, and the entire electronic unit 2 can be cooled most efficiently.

Further, since the heat conducting members 26 and 26 are made of rubber, the adhesion to the electronic unit 2 can be improved, and the heat storage members 22 of the unit storage case 20 formed by the peripheral wall 21 The electronic unit 2 can be easily inserted.

Next, an electronic unit box according to a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 7 is a longitudinal sectional view of the electronic unit box according to the fourth embodiment of the present invention in a lateral direction in an assembled state.

In this embodiment, in this embodiment, the electronic unit 2 and the peripheral wall (secondary peripheral wall) of the unit storage case 20 are shown.
21, one end of the heat source 2a of the electronic unit 2
, The other end of which is in contact with the peripheral wall 21.
7 is interposed. Heat conduction members 27, 27
Is formed of a heat radiating rubber having high thermal conductivity as in the third embodiment.

According to such a configuration, the heat conducting member 2
The heat sources 2a, 2a of the electronic unit 2
Is easily radiated to the peripheral wall 21 of the unit storage case 20 forming the air layer 40. Thus, the heat sources 2a of the electronic unit 2 can be locally radiated, and the entire electronic unit 2 can be efficiently cooled.

The electronic unit box according to the present invention comprises:
The present invention is not limited to the above embodiments. For example, in the third and fourth embodiments, the heat conductive members 26,
Although rubber having thermal conductivity is used for 27, the present invention is not limited to this, and a metal having good thermal conductivity (such as copper or aluminum) may be used.

[0044]

As described above, according to the electronic unit box of the present invention, the heat source of the electronic unit can be locally radiated, and the entire electronic unit can be efficiently cooled.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an electronic unit box according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the electronic unit box in a longitudinal direction in an assembled state.

FIG. 3 is an exploded perspective view showing an electronic unit box according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of the electronic unit box in a longitudinal direction in an assembled state.

FIG. 5 is an exploded perspective view showing an electronic unit box according to a third embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of the electronic unit box in a short direction in an assembled state.

FIG. 7 is a longitudinal sectional view in a lateral direction of an assembled state of an electronic unit box according to a fourth embodiment of the present invention.

FIG. 8 is an exploded perspective view showing a conventional electronic unit box.

FIG. 9 is a longitudinal sectional view of the electronic unit box in a short direction in an assembled state.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electronic unit box 2 electronic unit 2a heat source 10 box body 11 peripheral wall (primary peripheral wall) 20 unit storage case 21 peripheral wall (secondary peripheral wall) 24 thin portion 25 opening 26, 27 heat conducting member 30 cover 40 air layer

Claims (5)

[Claims] 1. An air layer formed between an outer primary peripheral wall and an inner secondary peripheral wall, wherein an electronic unit having a heat source is housed in the secondary peripheral wall and air circulates in the air layer. In the electronic unit box for cooling the electronic unit, a portion of the secondary peripheral wall corresponding to a heat source of the electronic unit is thinned, and the heat source is locally radiated. . 2. An air layer that forms an air layer between an outer primary peripheral wall and an inner secondary peripheral wall, houses an electronic unit having a heat source in the secondary peripheral wall, and circulates in the air layer. An electronic unit box for cooling the electronic unit, wherein a portion of the secondary peripheral wall corresponding to a heat source of the electronic unit is opened, and the heat source is locally radiated. . 3. An air layer that forms an air layer between an outer primary peripheral wall and an inner secondary peripheral wall, houses an electronic unit having a heat source in the secondary peripheral wall, and circulates in the air layer. In the electronic unit box for cooling the electronic unit, heat conduction is provided between the electronic unit and the secondary peripheral wall, one end corresponding to a heat source of the electronic unit, and the other end contacting the secondary peripheral wall. An electronic unit box comprising a member, and a heat source of the electronic unit is locally radiated by the heat conducting member. 4. Air that forms an air layer between an outer primary peripheral wall and an inner secondary peripheral wall, stores an electronic unit having a heat source in the secondary peripheral wall, and circulates in the air layer. In the electronic unit box for cooling the electronic unit, a heat conducting member penetrating the secondary peripheral wall, one end corresponding to a heat source of the electronic unit, and the other end reaching the air layer, is provided. An electronic unit box, wherein a heat source of the electronic unit is locally radiated by a member. 5. The electronic unit box 1 according to claim 3, wherein said heat conducting member is made of rubber having high heat conductivity.