JP2001359225A - Electronic apparatus for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small-sized, light, and inexpensive electronic apparatus for vehicles. SOLUTION: The electronic apparatus is provided with a molded case which molded into an integrated body with connectors, which make a signal exchange between the outside and electronic components arranged inside and have insert- molded terminals, the electronic components to be electrically connected to the terminals, and a sheet metal case which forms a pair with the molded case and houses the electronic components. The molded case has an annular groove in the periphery of a surface which forms a pair with the molded case. The sheet metal case has a bent part, formed by cutting the peripheral brim of its opening surface, and bending there into an obtuse angle towards the outside of the case. The molded case and the sheet metal case are glued and fixed, by fitting the bent portion into the annular groove and filling it with an adhesive sealing material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle electronic device which can be directly mounted on an engine room or an engine or a transmission in an engine room.

[0002]

2. Description of the Related Art Vehicle electronic equipment used for automobiles and the like requires elements such as inexpensive, small, and lightweight. Especially, electronic equipment mounted outside the vehicle compartment is required to be waterproof by adding these elements. Resistance, earthquake resistance, and stability resistance to thermal cycling are required.

[0003] An example of a vehicular electronic device compatible with such an environment is disclosed in Japanese Patent Application No. 10-151689. FIG. 4 is a perspective view showing a conventional vehicle electronic device. FIG. 5 is a sectional view taken along line AA of FIG. In the figure, reference numeral 1 denotes an upper case formed by molding, 2 denotes a connector having a terminal group 5 formed integrally with the upper case 1 and insert-molded in the upper case 1, and 3 denotes a lower case formed by die casting or the like, and 3 denotes a lower case. The upper case 1 and the upper case 1 are bonded and fixed with an adhesive over the entire circumference. 4 is a mounting foot of a vehicle electronic device; 6 is a printed circuit board formed of a resin such as glass epoxy, having printed conductors on both sides;
7a is a semiconductor component mounted on the first surface 6a of the printed circuit board 6 at high density, and 7b is an electronic component mounted on the second surface 6b of the printed circuit board 6. Reference numeral 9 denotes a ventilation hole for providing air permeability in the case, and the ventilation hole 9 is provided with a water-repellent filter 8 having a property of allowing air to pass therethrough and water.

In such a conventional vehicle electronic device, the terminal 5 for the connector 2 is insert-molded in the upper case 1 and the upper case 1 and the connector 2 are integrated to take waterproof measures between them. ing. The lower case 3 has a structure in consideration of a die-cast material, and the mounting feet 4 of the product are completely integrated with the lower case 3 and are arranged outside the storage room of the electronic device. Further, for waterproofing between the upper case 1 and the lower case 3, a means is used in which the outer edges of both cases are fitted, and an adhesive is filled here as a sealing material. The fitting portion between the upper case 1 and the lower case 3 is previously positioned by a positioning means such as a projection so that a gap is formed. Since the adhesive flows into this gap, the upper case 1 and the lower case 3 can be securely bonded and fixed.

[0005]

As described above, the conventional vehicle electronic device has a configuration in which the lower case 3 is designed with die casting in mind. Die casting has a problem that costs such as mold manufacturing costs are high.

The present invention has been made to solve the above problems, and has as its object to obtain a small, lightweight, and inexpensive electronic device for a vehicle.

[0007]

A vehicle electronic device according to the present invention includes a molded case in which a connector for performing signal communication between a built-in electronic component and the outside is integrally formed, and a terminal is insert-molded in the connector. An electronic component electrically connected to the terminal, and a sheet metal case for storing the electronic component in a pair with the mold case, the mold case having an annular groove on an outer periphery of a surface forming a pair with the sheet metal case, The sheet metal case has a bent portion formed by cutting the outer peripheral edge of the opening surface and bending it obtusely toward the outside of the case, inserting the bent portion into the annular groove and filling the sealing material with the adhesive. And the sheet metal case are bonded and fixed.

[0008] A gap is formed between the annular groove and the cut surface of the bent portion for flowing the adhesive seal material before the adhesive seal material is cured.

Further, the sheet metal case has a squeeze hole for connecting a space formed by the mold case and the sheet metal case with the outside air, and has a property that air passes through the squeeze hole and does not allow water to pass therethrough. A water-repellent filter is provided.

[0010]

FIG. 1 is a perspective view showing a vehicle electronic device according to an embodiment of the present invention. Also, FIG.
It is sectional drawing in the XX line of said FIG. In the drawing, reference numeral 1 denotes a molded case integrally formed with the connector 2,
Reference numeral 3 denotes a sheet metal case forming a pair with the mold case, and reference numeral 4 denotes an attachment member spot-welded to the sheet metal case 3, and the attachment member 4 has an attachment hole 4a. Reference numeral 5 denotes a connector terminal that is insert-molded into the mold case 1, 6 denotes a printed circuit board that is adhered and fixed inside the mold case 1, and is electrically connected to the connector terminal 5, and 7a denotes a first printed circuit board 6. The electronic component 7b is an anaerobic or anaerobic electronic component such as a chip-exposed semiconductor mounted on the second surface 6b of the printed circuit board 6, and the electronic component 7b is an electronic component mounted on the printed circuit board 6. And the mold case 1 is housed in a closed room.

8 is adhesively fixed inside the sheet metal case 3,
A water-repellent filter having a property of passing air and not allowing water to pass therethrough. Reference numeral 9 denotes a squeeze hole for connecting a space formed by the sheet metal case 3 and the printed board 6 to the outside air, and a water-repellent filter 8 is interposed in the ventilation path. Is what it is.

FIG. 3 is an enlarged view of a portion A in FIG. In the drawing, reference numeral 100 denotes a bent portion obtained by expanding the outer peripheral edge of the opening surface of the sheet metal case 3 at an obtuse angle.
The bent portion 100 is formed at the same time as the drawing of the sheet metal case 3, and the outermost edge portion where wrinkles occur is cut and cut off to form the outermost edge cut surface 100 c.
Reference numeral 101 denotes an annular groove provided at an outer edge portion of the mold case 1. The annular groove 101 is filled with a resin such as a thermosetting silicone resin or an epoxy resin with the bottom surface 101a of the groove facing down. Here, the bent portion 100 of the sheet metal case 3 is fitted and inserted, so that the mold case 1 is formed.
And the sheet metal case 3 are bonded and fixed.

The meaning of bending the outer peripheral edge of the opening surface of the sheet metal case 3 at an obtuse angle is as follows.
A space of a triangular cross section is formed between the inner slope 100a of the inner groove 100 and the bottom surface 101a of the annular groove 101, and the adhesive sealing material is retained here. For example, the bent portion 10
0 is bent 90 ° to the outside of the sheet metal case 3, and the bent portion 100 is formed by the bottom surface 101 a and the wall surface 1 of the annular groove 101.
In the case where the adhesive seal material is configured to be in close contact with 01c, the adhesive seal material having fluidity and low viscosity may protrude, and the adhesive seal material may not be interposed between the bent portion 100 and the annular groove 101. Therefore, as in the present embodiment, the bent portion 100 is bent to the outside of the sheet metal case 3 at an obtuse angle, and the inner slope 100a of the bent portion 100 is formed.
And a bottom surface 101a of the annular groove 101, a space having a triangular cross section is formed.
The adhesive sealing material always intervenes and stays between the inner slope 100a and the annular groove 101, so that the adhesive creeping distance can be secured.

The meaning of cutting and cutting off the outermost edge of the bent portion 100 means that the width of the annular groove 101 is reduced as much as possible by improving the size of the outermost edge, thereby reducing the size of the product. is there. Also, this cutting surface 100c
The adhesive extrudes from a space having a triangular cross section formed between the inner slope 100a of the bent portion 100 and the bottom surface 101a of the annular groove 101 through the gap between the inner slope 100b of the bent portion 100 and the outer slope 100b of the bent portion 100. And the adhesive flows into the space between the annular groove 101 and the wall surface 101b,
Adhesive creepage distance is ensured.

However, in order to reduce the size of the product, the annular groove 101 is required.
If the width is smaller, a sufficient gap is not secured between the outermost edge cutting surface 100c of the bent portion 100 and the wall surface 101b of the annular groove 101. Therefore, when it is desired to further reduce the width of the annular groove 101, the formation of the gap may be ignored, and the outer slope portion 100 b of the bent portion 100 may be additionally filled with the adhesive sealing material as needed.

The adhesive sealing material filled in this way is initially a fluid and low-viscosity material, but after completion of filling, it is cured by heating or natural drying to form the mold case 1 and the sheet metal case 3. And unite with
It functions as a waterproof between the two cases.

As described above, according to this embodiment,
An annular groove 10 filled with an adhesive sealant in a mold case 1
1, the outer peripheral edge of the opening surface of the sheet metal case 3 is cut out and bent into an obtuse angle, and the bent portion 100 is inserted. Therefore, the sheet metal case 3 with low cost is used instead of the conventional die casting. Thus, the creeping distance can be secured, and the mold case 1 and the sheet metal case 3 can be securely bonded and integrated. Therefore, it is excellent in waterproofness and vibration resistance,
An inexpensive and small vehicle electronic device can be obtained.

The sheet metal case 3 is provided with a water-repellent filter 8 through a squeezing hole 9. Since the water-repellent filter 8 allows air to pass through, it is possible to eliminate the pressure difference between the pressure in the space surrounded by the mold case 1 and the sheet metal case 3 and the outside air pressure due to the difference between the inside temperature of the case and the outside air temperature. Therefore, the adhesion between the mold case 1 and the sheet metal case 3 caused by the pressure difference can be prevented, and the adhesive sealing function can be protected. In addition, since the water-repellent filter 8 does not allow water to pass through, the electronic components 7a in the case,
7b is protected and has excellent waterproofness.

Further, the water-repellent filter 8 has a squeezing hole 9
Therefore, even when the thickness of the sheet metal case 3 is extremely thin, foreign matter hardly enters the water-repellent filter 8 from the outside during product handling by increasing the depth of the squeezing hole 9. Damage to the water-repellent filter 8 can be prevented.

[0020]

As described above, according to the first aspect of the invention, the connector for performing signal communication between the built-in electronic component and the outside is integrally formed, and the terminal is insert-molded to the connector. And an electronic component electrically connected to the terminal, and a sheet metal case for storing the electronic component in a pair with the mold case, the mold case having an annular groove on an outer periphery of a surface forming a pair with the sheet metal case. The sheet metal case has a bent portion formed by cutting the outer peripheral edge of an opening surface thereof and bending it obtusely toward the outside of the case, inserting the bent portion into the annular groove and filling with an adhesive sealing material. Since the case and the sheet metal case are adhered and fixed, there is an effect of obtaining an inexpensive and compact vehicle electronic device which is excellent in waterproofness and vibration resistance.

According to the second aspect of the present invention, a gap is formed between the annular groove and the cut surface of the bent portion for flowing the adhesive seal material before the adhesive seal material hardens. The effect that the adhesion creepage distance between the mold case and the sheet metal case can be further secured can be obtained.

According to the third aspect of the present invention, the sheet metal case has a squeezing hole for connecting a space formed by the mold case and the sheet metal case with the outside air, and the squeezing hole has an air therein. Is provided with a water-repellent filter having a property of allowing water to pass therethrough, so that the water-repellent filter is excellent in waterproofness, and has an effect of preventing foreign matter from entering the water-repellent filter from the outside and preventing damage to the water-repellent filter.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a vehicle electronic device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional configuration diagram showing the vehicle electronic device according to the embodiment of the present invention.

FIG. 3 is an enlarged configuration diagram showing a bent portion and a vicinity of an annular groove of the vehicle electronic device according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional vehicle electronic device.

FIG. 5 is a cross-sectional configuration diagram showing a conventional vehicle electronic device.

[Explanation of symbols]

1 Mold case, 2 connectors, 3 sheet metal cases,
Reference Signs List 4 mounting member, 5 connector terminal, 6 printed circuit board, 7a electronic component, 7b anaerobic / anaerobic electronic component, 8 water repellent filter, 9 squeezing hole, 100 bent portion, 101 annular groove

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4E360 AB02 AB12 AB33 BA08 BC05 BD03 EA03 EA18 EC05 ED07 ED27 FA08 GA22 GA28 GA29 GB94 GC02 GC08 5G361 AA07 AB09 AC03 AD01 BB01 BC02

Claims (3)

[Claims] 1. A molded case in which a connector for performing signal communication between a built-in electronic component and the outside is integrally formed, and a terminal is insert-molded in the connector, and an electronic component electrically connected to the terminal. A sheet metal case that stores the electronic component in a pair with the mold case, the mold case has an annular groove on an outer periphery of a surface forming a pair with the sheet metal case, and the sheet metal case has an opening surface thereof. The mold case and the sheet metal case have a bent portion formed by cutting the outer peripheral edge and bending the shape toward the outside of the case at an obtuse angle, and inserting the bent portion into the annular groove and filling an adhesive seal material. Electronic equipment for vehicles, characterized in that: 2. Between the annular groove and the cutting surface of the bent portion,
2. The electronic device for a vehicle according to claim 1, wherein a gap for flowing the adhesive seal material is formed before the adhesive seal material is cured. 3. The sheet metal case has a squeeze hole for connecting a space formed by the mold case and the sheet metal case with the outside air, and has a property that air passes through the squeeze hole and does not allow water to pass therethrough. The vehicle electronic device according to claim 1, further comprising a water-repellent filter.