JP2000252652A - Board holder for control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a board easily and surely while absorbing dimensional error when the board is contained in a case. SOLUTION: In a case comprising a split cover 21 and a base 11, forward end of a protrusion 25 formed on the cover 21 is deformed resiliently when a printed board 31 is mounted on the base 11 and the cover 21 is applied and a hole part 32 of the printed board 31 is pressed against the base 11 side. Consequently, forward end of the protrusion 25 is passed through the hole part 32 and fitted in the fitting hole part 15 of the base 11. Since the protrusion 25 and the fitting hole part 15 are formed, respectively, on the cover 21 and the base 11 in correspondence with the hole part 32 of the printed board 31, the printed board 31 can be contained easily, surely and fixedly in a case comprising a cover 21 and a base 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board holding device for a control device such as an electronic control device in which a board on which a plurality of electronic components are mounted is housed in a case.

[0002]

2. Description of the Related Art Conventionally, as a prior art document related to a substrate holding device of a control device, a document disclosed in Japanese Patent Application Laid-Open No. 8-335785 is known. In this one,
When the substrate is accommodated in the case, the substrate is placed at the center of the case by a plurality of protrusions (holding ribs) formed on opposing inner wall surfaces of the case which are combined with the substrate in upper and lower divisions. A technique of pinching and fixing using elastic deformation is disclosed.

[0003]

By the way, in the above-mentioned device, since the substrate is sandwiched between a plurality of protrusions whose tips are formed flat on the inner wall surface of the case, for example, the length of each protrusion is reduced. If there is an error, the substrate is warped, and the wiring pattern formed on the substrate and the soldered portion of the mounted electronic component are damaged by bending stress. Further, in a configuration in which a connector member for electrically connecting to a mating connector of an external device is provided on the board, for example, when the mating connector is inserted and removed, the board surface is connected to the board via the connector member. When a parallel force is applied, a phenomenon occurs that the substrate moves because the tip of the protrusion is flat. For this reason, there arises a problem that the substrate surface is rubbed by the protruding portions and the wiring patterns, electronic components and the like are damaged.

Therefore, the present invention has been made to solve such a problem, and when the substrate is accommodated in a case, the fixing is simple and reliable while absorbing dimensional errors and the like. It is another object of the present invention to provide a board holding device for a control device that does not adversely affect the board even when a force is applied to the board and that can easily remove the board from the case.

[0005]

According to the substrate holding apparatus for a control device of the present invention, the case is formed by mounting the substrate on one of the two-part cases and then mounting the other. The tip of the protrusion formed on one side is elastically deformed and presses the hole of the substrate, and the tip of the protrusion passes through the hole and fits into the other insertion hole. In this way, the protrusion is formed on one side of the case and the insertion hole is formed on the other corresponding to the hole of the board, and the protrusion and the insertion hole are combined only through the hole of the board. Therefore, the substrate can be easily and reliably fixed and accommodated without receiving bending stress or the like from the case side, and the substrate can be easily removed because it is fixed with the front and back sandwiched.

According to a second aspect of the present invention, there is provided a board holding device for a control device.
The protruding portion is molded with resin simultaneously with one of the cases, and a slit-like cut portion is formed at the tip of the protruding portion. In this manner, the diameter of the protruding portion having the slit-shaped cut portion formed therein can be freely changed by elastic deformation, so that the substrate can be easily and reliably fixed to a case having a two-part structure. And housed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples.

FIG. 1 is an exploded perspective view showing a configuration of a board holding device of a control device according to an embodiment of the present invention. In this embodiment, wiring patterns formed on a printed circuit board, mounted electronic components, and the like are omitted.

In FIG. 1, the case of the electronic control device 100 has a substantially rectangular parallelepiped shape made of resin and has an upper cover 21 and a lower base 11 which are vertically divided into two parts. This cover 2
In order to assemble the printed board 31 between the base 1 and the base 11, a step 13 corresponding to the thickness of the printed board 31 is provided along the inner wall surface on the base 11 side. This step 13
Is formed with an insertion hole 15 at the same position as the hole 32 formed in the printed circuit board 31. Base 1
Protrusions 12 are formed on the left and right outer peripheral side surfaces of 1. Here, the hole 32 of the printed circuit board 31 is preferably used as a positioning hole necessary for the manufacture of the board, as in this embodiment, because the board area can be effectively used, but it can be provided separately.

On the outer peripheral side surface of the cover 21, there is formed a fitting portion 22 corresponding to the protruding portion 12 of the base 11, which is in an inserted state when the assembly is completed. In addition, the base 1 is moved from the inner wall surface of the cover 21.
Four cylindrical protrusions 25 each having a substantially conical tapered end are formed toward the one insertion hole 15 side. The protruding portion 25 has a slit-like cut portion 26 formed in a slit shape from the front end side to the base side, and in the present embodiment, the front end side has a four-part shape. A connector member 35 for electrically connecting to an external device is fixed to the printed circuit board 31 with screws or the like. When the assembly is completed, the connector member 35 from the connector notch 23 on the cover 21 side is mated with the connector member 35. The connection terminal side with the side connector (not shown) faces the outside.

Next, the assembling of the electronic control device 100 configured as described above will be described with reference to FIGS. Here, FIG. 2 is a partial cross-sectional view showing a main part configuration of FIG. 1, and FIG. 2 (a) shows a projection 25 of the cover 21, a hole 32 of the printed circuit board 31, and an insertion hole of the base 11. 15 shows a state before assembly, and FIG. 2B shows an assembly completed state. The hole 32 of the printed circuit board 31 is
The protrusion 25 has a tapered shape that spreads at a predetermined angle in accordance with the tip shape of the protrusion 25.

First, a printed board 31 is placed on a step 13 provided along the inner wall surface of the base 11 and temporarily fixed in the board surface direction. Next, fitting portions 22 formed on the outer peripheral side surface of the cover 21 corresponding to the protrusions 12 formed on the left and right outer peripheral side surfaces of the base 11 are pressed in the mounting direction. At this time,
As shown in FIG. 2A, the cover 21 is formed on the cover 21 so as to correspond to the insertion hole 15 formed on the base 11 so as to be located at the same position as the hole 32 formed on the peripheral surface of the printed circuit board 31. This is the position where the projected portion 25 faces.

Thereafter, as shown in FIG. 2B, the tip of the projecting portion 25 of the cover 21 is
Pressed to 2. Then, the tip of the protruding portion 25 is elastically deformed, and the cut portion 26 is radially compressed so as to follow the diameter of the hole 32 of the printed circuit board 31. And the protrusion 2
5 is inserted into the insertion hole 15 of the base 11.

As described above, in the assembled state in which the fitting portion 22 of the cover 21 is inserted into the projection 12 of the base 11, the printed circuit board 31 is mounted on the base 25 by the projection 25 formed on the cover 21. It is pressed and pinched to the 11 side, and is also fixed in the substrate surface direction. As a result, the printed circuit board 31 is securely fixed and accommodated between the base 11 and the cover 21 constituting the case of the electronic control device 100. Further, since the protruding portion 25 of the cover 21 is pushed upward by the reaction force from the printed circuit board 31 side, the protruding portion 12 of the base 11 and the fitting portion 22 of the cover 21 are securely fixed. 11 and the cover 21 are assembled without looseness.

Here, the length of the protruding portion 25 formed from the inner wall surface of the cover 21 is such that the protruding portion 12 of the base 11 and the fitting portion 22 of the cover 21 are completely assembled, as shown in FIG. As shown in (), a margin is set so that the tip of the protruding portion 25 can maintain a state in which the printed circuit board 31 is pressed against the base 11. Therefore, the width of the cut portion 26 is set so that even if the length of the protruding portion 25 becomes somewhat longer, it can be absorbed by the elastic deformation of the tip.

As described above, the electronic control device 10 of the present embodiment
The printed circuit board 31 has a plurality of electronic components mounted thereon, a printed circuit board 31 having four (plural) holes 32 having predetermined dimensions formed at predetermined positions on a peripheral surface thereof, and a printed circuit board 31 accommodated therein. One cover 21 has a cylindrical shape with a substantially conical tapered end, and a protrusion 25 that is elastically deformed by insertion into the hole 32 of the printed circuit board 31 and whose diameter can be changed. The other base 11 has a cover 21 and a base 11 formed with an insertion hole 15 having substantially the same dimension as the tip diameter when the protruding portion 25 is assembled through the hole 32 of the printed circuit board 31. A case.

Therefore, according to the case composed of the cover 21 and the base 11 having a two-part structure, the printed board 31 is placed on the base 11 and then the cover 21 is assembled. The tip of the protrusion 25 is elastically deformed and presses the hole 32 of the printed circuit board 31 against the base 11, and the tip of the protrusion 25 passes through the hole 32 and
Is inserted into the insertion hole portion 15 of FIG. As described above, the protrusions 25 are formed on the cover 21 corresponding to the holes 32 of the printed circuit board 31.
And the insertion hole 15 is formed in the base 11,
The printed circuit board 31 can be simply and reliably fixed and accommodated in the case composed of the cover 21 and the base 11.
Further, when the printed circuit board 31 is accommodated in the case including the cover 21 and the base 11 in the case where the mating connector is inserted or removed, even if a force is applied to the printed circuit board 31 via the connector member in a direction parallel to the board surface direction, Does not move, so there is no adverse effect such as damage to wiring patterns and electronic components. And the printed circuit board 3
1 is merely sandwiched and fixed, so that the cover 21
By simply disassembling the case made of the base 11, the case can be easily and easily removed.

Further, in the board holding device of the electronic control device 100 of the present embodiment, the projecting portion 25 is made of resin and has a slit-like cut portion 26 formed from the front end toward the base. For this reason, the projecting portion 25 can be resin-molded simultaneously with the cover 21, and the printed circuit board 31 is easily and reliably fixed to the case including the cover 21 and the base 11 by elastic deformation by the slit-shaped cut portion 26 of the projecting portion 25. Can be accommodated.

By the way, in the above embodiment, the projecting portion 25 is formed integrally with the cover 21 made of resin. However, the present invention is not limited to this. It is sufficient that the distal end of the protruding portion 25 can change its diameter dimension by elastic deformation, and its material may be rubber or the like. Further, the material of the base 11 is not limited to resin, but may be metal such as aluminum.

Further, in the case of the electronic control device 100 of the above embodiment, a configuration in which the board area of the printed board 31 matches the size accommodated therein has been described. The configuration is not limited, and the configuration of the electronic control device 200 as shown in FIG. 3 can be adopted. In the drawings, the same reference numerals and symbols are given to components having the same configuration or corresponding portions as those in the above-described embodiment, and detailed description thereof will be omitted.

Referring to FIG. 3, the electronic control device 200 has a case composed of a base 11 'and a cover 21', and has about twice the volume of the electronic control device 100 described above. On the inner wall surface of the cover 21 ', there are formed six cylindrical projections 25 each having a substantially conical tapered end toward the insertion hole 15 of the base 11'. In the case where the electronic control device 200 thus divided into two parts is composed of the cover 21 ′ and the base 11 ′, the printed circuit board 31 having the same size as the above-described embodiment and having the board area indicated by the solid line or the printed circuit board 31. Any one of the printed boards 31 ′ having a board area of a size obtained by adding the board area indicated by the two-dot chain line to the board 31 can be accommodated. That is, according to such a configuration, the printed circuit boards 31 and 3 having different sizes using the same case are used.
1 'can be selectively housed and assembled as appropriate, so that the versatility of the case is increased and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a substrate holding device of a control device according to an example of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a main configuration of FIG.

FIG. 3 is an exploded perspective view showing a modification of the board holding device of the control device according to one example of the embodiment of the present invention.

[Explanation of symbols]

 11 Base (Case) 15 Insert Hole 21 Cover (Case) 25 Projection 26 Notch 31 Printed Circuit Board 32 Hole 100 Electronic Control Equipment

Claims (2)

[Claims] 1. A board on which a plurality of electronic components are mounted and a plurality of holes having a predetermined dimension are formed at predetermined positions on a peripheral surface of the board, and a two-part configuration for accommodating the board is provided. The tip is formed in a cylindrical shape having a substantially conical taper shape, and the protrusion is elastically deformed by being inserted into the hole of the substrate to form a protrusion whose diameter can be changed. A case in which an insertion hole having substantially the same dimension as the diameter of the tip when assembled through the portion is formed. 2. The board holding device for a control device according to claim 1, wherein the projecting portion is made of resin and has a slit-like cut portion formed from a tip end toward a base.