JP2002223083A - Electronic control system and method of assembling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic control system having sufficient vibration proof characteristics. SOLUTION: An external section of one face of a printed wiring board 30 contacts to an external section of a case body 10, a first protruding part 13 extending from the external section of the board-contacting section 12 is bent with itself fitted into a hole 26 at a second protruding part 22 extending from the external section of a cover 20, and clamps the printed wiring board 30 between the tip side of the bent section and the board-contacting section 12 of the case body 10. This fixes the printed wiring board 30 forming the electronic control system in the body of equipment consisting of the case body 10 and the cover 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic control device in which a substrate forming an electronic control circuit is fixed in a housing composed of a housing main body and a lid, and is used in an electronic control device under a vibration receiving environment such as a vehicle. It is suitable for the device.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Hei 8-88482 discloses a technique for easily assembling a substrate in a housing without using screws. As shown in FIG. 12, a substrate supporting piece 111 is protruded from the housing body 110, a folded piece 121 is extended from a peripheral portion of the lid 120, and a holding piece 122 is formed. Piece 11
The structure is such that the substrate 130 is fixed between 1 and the tip of the holding piece 122, and the end of the housing body 110 is held between the folded piece 121 and the holding piece 122 via the projection 123.

However, in order to fix the lid 120 to the housing main body 110, a method is adopted in which a projection 123 is further provided on the holding piece 122 of the lid 120 and the projection 120 is fixed to the housing main body 110. It is a simple fixation and has relatively little vibration, and is effective for home appliances, for example.However, in the case of automobiles, the structure must be able to withstand a certain amount of vibration, so this structure generates abnormal noise. There is a danger that the fitting will be lost.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic control unit which can sufficiently withstand vibration.

[0005]

According to the electronic control device of the first aspect, the first portion of the housing main body is held in a state where the outer peripheral portion of one surface of the substrate contacts the substrate contact portion of the housing main body. Is bent and fitted in the through hole or the concave portion of the second protrusion of the lid, and the substrate is sandwiched between the front end and the substrate contact portion of the housing body. You.

As described above, by adopting the method of fitting and fixing the lid by bending the first projecting piece of the housing body and holding and fixing the substrate, it is possible to sufficiently endure vibration. Become.

[0007] As described in claim 2, the second protruding piece is
It is formed by bending, and if a rib (reinforcement bone) by extrusion is provided in the bent portion, the bent portion can be reinforced, which is practically preferable.

According to the third aspect of the invention, the heat generated by driving the heating element is transmitted to the substrate, and further transmitted to the housing through a contact portion of the substrate with the housing.
Heat is dissipated. In this way, a heat transfer path is formed through the substrate holding portion in the housing, and the heat dissipation is excellent.

According to the method of assembling the electronic control device according to the fourth aspect, the first protrusion of the housing main body is contacted with the outer peripheral portion of one surface of the substrate in contact with the outer peripheral portion of the housing main body. The first protruding piece is bent so as to fit into the through hole or the concave portion of the second protruding piece of the lid, and the bent portion is moved from the state in which the front end is brought into contact with the lid side so that the housing main body and the lid are approached. Also, by sandwiching the substrate between the substrate contact portion on the front end side, the substrate forming the electronic control circuit is fixed in the housing composed of the housing main body and the lid. In this way, assembly becomes easy.

[0010] As described in claim 5, the second protruding piece is
It is formed by bending, and if a rib (reinforcement bone) by extrusion is provided in the bent portion, the bent portion can be reinforced, which is practically preferable.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the electronic control device according to the present embodiment. In this electronic control device, a printed circuit board 30 is fixed in a housing including a case main body 10 as a housing main body and a cover 20 as a lid. Electronic components 31 are provided on the printed circuit board 30.
Are mounted, and an electronic control circuit is formed by the printed circuit board 30 and the electronic components 31. The electronic component 31 mounted on the printed circuit board 30 includes a heating element 31a,
A power transistor is used as the heating element 31a. This electronic control unit is mounted on a vehicle and controls the engine, that is, a so-called engine ECU (ECU).
nic Control Unit). The case body 10 is made of a steel plate material, is box-shaped, and has a shape with an open lower surface. A window 11 is formed in the front of the case body 10, and the printed circuit board 30 is formed through the window 11.
A cable can be connected to an external connection connector (not shown) mounted on the PC.

FIG. 2 is a detailed view of a main part of the case body 10, in which the right side shows the case body 10 viewed from the front, and the left side thereof shows the case body 10 from the left side. Things. In FIGS. 1 and 2, a step portion 12 is formed on the left and right side surfaces of the case body 10 (the outer peripheral portion of the case body 10). The outer peripheral portion of one surface of the printed circuit board 30 is formed on a horizontal plane formed by the step portion 12 Will come in contact. A first protruding piece 13 is provided on a side wall surface of the case body 10 located on the outer peripheral side of the step portion (substrate contact portion) 12, and the protruding piece 13 linearly extends downward. As shown in FIG.
0 are provided on the left side surface, and two are also provided on the right side surface.

In FIG. 1, the cover 20 is made of a copper plate and has a rectangular plate shape. Also, a square plate-shaped cover 2
The locking pieces 21 are erected on the front and rear surfaces of the front panel 0, and the locking pieces 21 are also erected on the left and right sides.

FIG. 3 is a detailed view of a main part of the cover 20, in which the right side shows the cover 20 viewed from the front, and the left side shows the cover 20 from the left side. . 1 and 3, a second protruding piece 22 extending upward is provided on the outer peripheral portion of the cover 20, and two protruding pieces 22 are formed on each of the right and left sides of the cover 20 as shown in FIG. The protruding piece 22 is formed by bending, and as shown in FIG.
And the second standing portion 25. An elongated hole (through hole) 26 extending in the horizontal direction is formed in the second standing portion 25. Further, two ribs (reinforcing bones) 27 are formed in a bent portion for forming the first standing portion 23, and similarly, the first standing portion 2 is formed.
A rib (reinforcing bone) 2 is provided at a bent portion between
8 are formed, and two ribs (reinforcing bones) 29 are formed in a bent portion between the horizontal portion 24 and the second standing portion 25. These ribs (reinforcement bones) 27, 28, and 29 are formed by extruding the bent portions, and have higher rigidity than when the plate is simply bent at a right angle.

Next, the order of assembly will be described. First, as shown in FIG. 4, the case body 10 is set upside down on the jig 40. In this state, the case main body 10 is located on the jig 40, and the substrate contact portion 12 of the case main body 10 is in contact with the jig 40. Further, the printed circuit board 30 is arranged inside the case body 10. At this time, the printed circuit board 30 is connected to the board contact portion 1 of the case body 10.
Touch 2. On the other hand, the cover 20 is set on the jig 41 and is positioned above the jig 40 with the cover 20 turned upside down. In this state, the projecting piece 22 of the cover 20
Is in contact with the jig 41.

A jig 41 on which the cover 20 is set
Is moved downward. Then, as shown in FIG. 5, the cover 20 is lowered in a state where the inner peripheral surface of the second upright portion 25 of the projecting piece 22 of the cover 20 and the outer peripheral surface of the projecting piece 13 of the case body 10 are in contact with each other. The tip of the projecting piece 13 of the case main body 10 comes into contact with the horizontal portion 24 of the projecting piece 22 of the cover 20.

As shown in FIG. 5, a slanted folded portion 25a is formed at the tip of the projecting piece 22 of the cover 20 (the tip of the second standing portion 25). The tip of the piece 13 is guided so that the sliding operation between the protruding pieces 13 and 22 is reliably performed.

Subsequently, the jig 4 on which the cover 20 is set
1 is moved downward to apply pressure to the projecting piece 13 of the case body 10. That is, the substrate contact portion 12 of the case body 10
The case body 10 and the cover 20 are brought close to each other from a state in which the tip of the first protrusion 13 of the case body 10 is brought into contact with the cover 20 while the printed circuit board 30 is in contact with the case. Then, as shown in FIG. 6, the projecting piece 13 of the case main body 10 is bent. In other words, a force is exerted on the projecting piece 13 of the case body 10 due to pressure to the outside of the case body 10, and the projecting piece 13
Is bent outwardly from the through hole 26 of the second projecting piece 22 of the cover 20. Further, the jig 41 on which the cover 20 is set is moved downward, and the projecting piece 13 of the case body 10 is moved.
7, the protruding piece 13 of the case body 10 bends so as to wrap around the periphery of the printed circuit board 30 from the outside, as shown in FIG. It will be clamped by the part 12. That is, the first protruding piece 13 is bent so as to fit into the through-hole 26, and the printed board 30 is sandwiched between the first protruding piece 13 and the board contact part 12 at the tip side of the bent portion.

When the jigs are removed from the jigs 40 and 41, FIG.
As shown in FIG. 10, the assembly of the engine ECU in which the printed circuit board 30 is fixed in the housing is completed. For more information,
FIG. 8 is a front view of the housing (the case main body 10 and the cover 20) and the board 30 after assembly, FIG. 9 is a cross-sectional view thereof, and FIG. 10 is a left side view after assembly. Fig. 8-
In FIG. 10, the outer peripheral portion of the upper surface of the printed circuit board 30 is in contact with the board contact portion 12 of the case body 10. Also,
The first protruding piece 13 of the case body 10 is bent in a state of being fitted in a through hole 26 provided in the second protruding piece 22 of the cover 20, and the substrate contact portion 12 is located on the tip side of the bent portion. And the printed circuit board 30 is sandwiched therebetween.
Thus, the cover 20 is fixed to the case main body 10 and the printed circuit board 30 is fixed to the housing (the case main body 10 + the cover 20). In this state, the cover 20
Of the printed circuit board 30 and the cover 2
An interval d of 0 is ensured. The locking piece 2 of the cover 20
1 (see FIG. 1) is positioned in contact with the outer peripheral surface of the case body 10.

As described above, the cover 20 is fitted and fixed by bending the first projection 13 of the case body 10 and the printed circuit board 30 is sandwiched and fixed, whereby the assembly can be easily performed. At the same time, it can sufficiently withstand the vibration of the vehicle.

Further, the structure in which the printed circuit board 30 is brought into contact with the housing allows the heat generating element 31a to be excellent in heat dissipation. That is, heat generated by driving the heating element 31 a is transmitted to the printed circuit board 30, and furthermore, the housing (the case body 10 and the cover 2) on the printed circuit board 30.
0), and is transmitted to the housing (the case body 10 and the cover 20) side through the contact portion, and is radiated. In this way, a heat transfer path is formed through the substrate holding portion in the housing, and the heat dissipation is excellent.

The ribs (reinforcing bones) 27, 28,
29 reinforces against the pressure received at the time of assembling in FIGS. 5 to 7, and assembling can be performed reliably. In addition, instead of the through hole 26 of the second protruding piece 22 of the cover 20 of FIG. 9, a recess 50 is formed as shown in FIG. It may be.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electronic control device according to an embodiment.

FIG. 2 is a detailed view of a main part of a case main body.

FIG. 3 is a detailed view of a main part of the cover.

FIG. 4 is a cross-sectional view for explaining an assembling step.

FIG. 5 is a cross-sectional view for explaining an assembling step.

FIG. 6 is a cross-sectional view for explaining an assembling step.

FIG. 7 is a cross-sectional view for explaining an assembling step.

FIG. 8 is a front view of the housing and the board after assembly.

FIG. 9 is a cross-sectional view of the housing and the board after assembly.

FIG. 10 is a side view of the housing and the board after assembly.

FIG. 11 is a cross-sectional view illustrating another example.

FIG. 12 is a sectional view for explaining a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Case main body, 11 ... Window, 12 ... Step part (substrate contact part), 13 ... 1st protrusion, 20 ... Cover, 21 ... Locking piece, 22 ... 2nd protrusion, 23 ... 1st standing Set part, 24 ... Horizontal part, 25 ... Second standing part, 26 ... Elongate hole (through hole), 27 ... Rib (reinforcement bone), 28 ... Rib (reinforcement bone), 29 ... Rib (reinforcement bone), 30 ... printed circuit board, 31 ... electronic parts, 31a
... heating element, 50 ... recess.

Claims (5)

[Claims] An electronic control device comprising a substrate (30) forming an electronic control circuit fixed in a housing comprising a housing body (10) and a lid (20), wherein the housing body (10) is provided. At the outer periphery of the substrate (3)
0) comes into contact with the outer peripheral portion of one surface of the substrate contact portion (1).
2) The first protruding piece (13) extending from the outer peripheral side is fitted in the through hole (26) or the concave portion (50) of the second protruding piece (22) extending from the outer peripheral portion of the lid (20). The substrate (30) is bent in a state in which the substrate (30) is bent between the substrate contact portion (12) and the distal end side of the bent portion.
An electronic control device characterized in that the electronic control device is sandwiched. 2. The second projection (22) is formed by bending, and the bent portion is provided with a rib (27, 28, 29) by extrusion. 2. The electronic control device according to 1. 3. A heating element (31) is provided on the substrate (30).
The electronic control device according to claim 1, wherein a) is mounted. 4. An assembling method of an electronic control device in which a substrate (30) forming an electronic control circuit is fixed in a housing composed of a housing main body (10) and a lid (20), wherein the housing main body is provided. With the outer peripheral portion of one surface of the substrate (30) in contact with the outer peripheral portion of (10), the substrate contact portion (1)
From the state where the tip of the first protruding piece (13) provided on the outer peripheral side with respect to 2) is brought into contact with the lid (20) side, the housing body (10)
And the lid (20) are brought close to each other, and
Is provided on a second protrusion (2) provided on an outer peripheral portion of the lid (20).
The substrate (3) is bent so as to fit into the through hole (26) or the concave portion (50) in 2), and the front end side of the bent portion and the substrate contact portion (12).
0) The method for assembling an electronic control device, wherein the electronic control device according to (1) is sandwiched. 5. The second projection piece (22) is formed by bending, and the bent portion is provided with a rib (27, 28, 29) by extrusion. 5. The method for assembling the electronic control device according to item 4.