JP2023172479A - Component assembly structure - Google Patents

Abstract

To ensure sufficient holding strength without requiring a large amount of deflection.SOLUTION: A component assembly structure has a plurality of tongues 11, 12 which are elastically deformable in the bending direction of mountain-shaped bending portions 11A, 12A and which extend from a component 1 to form the bending portions 11A, 12A, and are arranged in parallel with the tops 11Ac, 12Ac of the bending portions 11A, 12A facing different directions from each other, and through holes 21, 22 provided through a substrate 2 into which the respective tongues 11, 12 are inserted, and each of the tongues 11, 12 produces elastic forces in opposite directions from each other in the form of the tops 11Ac, 12Ac contacting the inner surfaces 21A, 22A of the through holes 21, 22.SELECTED DRAWING: Figure 3

Description

The present invention relates to a component assembly structure.

It is generally known that a kink structure is used as an assembly structure for attaching components to through holes in a substrate. For example, Patent Document 1 discloses a configuration in which a slope on the base end side of a kink bent in a dogleg shape is brought into contact with an edge on the penetration side of a through hole. Furthermore, Patent Document 2 discloses a configuration in which the bent apex of the dogleg-shaped kink is located inside the through hole.

Japanese Patent Application Publication No. 2000-030781 Japanese Patent Application Publication No. 2008-192331

Here, in the case of a configuration in which the bent top passes through the through hole, the following points can be considered as the functions that the kink structure should satisfy.
In order for the bent top to pass through the through-hole, the kink must be deflected significantly, and the amount of deflection must take into account component tolerances (intersection of through-hole thickness, bending pitch intersection, bending dimension tolerance, etc.) . To increase the amount of deflection, the length of the kink becomes longer, and to decrease the amount of deflection, there is a limit to ensuring the holding strength.
Moreover, after the bent top passes through the through hole, it is necessary to suppress plastic deformation so that the slope on the base end side returns to contact with the through-side edge of the through hole. If the plastic deformation is large and the amount of return is insufficient, the parts may have floated due to the vibration of the conveyor during the solder flow process, the jet pressure of the solder flow being applied to the parts, or the handling of the board during the pre-soldering process. There is a possibility that it will be soldered.
In addition, it is necessary to suppress the insertion force to a level that can be incorporated by the operator so that the bent top passes through the through hole. Therefore, considering the balance between the holding force of the part and the insertion force of the kink, we created a slit in the part with a certain height to increase the length of the kink arm (obtaining large deflection with a small load). Is required. The length of the arm must be increased in proportion to the plate thickness to suppress the stress generated at the root of the kink.

Due to the above constraints, and considering the stress in the elastic range of general steel plates, when adopting a kink structure for relatively low-height parts where slits cannot be provided, the thickness of the plate should be thinned and the height of the part should be increased. It was necessary to make it higher. However, by increasing the height, the unfolded length of the parts becomes longer and the cost of parts becomes excessive. For this reason, for relatively low-height components, a structure in which the tip of the tongue inserted into the through hole is bent is often adopted, which requires many man-hours to bend the tongue. In addition, for components with a relatively low height, a structure in which the tip of the tongue piece is held using a clip can be adopted, but the cost of the clip will increase.

On the other hand, unless the bent tops of the plurality of dogleg-shaped kinks are arranged to face each other, sufficient holding strength cannot be ensured, which imposes restrictions on the arrangement of the kinks. That is, it is necessary to arrange the other kink on the opposite side on the extension line of the load where the kink occurs. If the other kink cannot be placed on the extension line of the load, the parts will rotate, so it is necessary to provide a separate tongue piece to prevent rotation. This increases the number of holes to be formed on the substrate, reducing the pattern area of the substrate.

Therefore, it is desired that the kink structure can be applied to components having a relatively low height, and that restrictions on the arrangement of the kink structure can be relaxed.

Therefore, an object of the present invention is to provide a component assembly structure that can ensure sufficient holding strength without requiring a large amount of deflection.

In order to achieve the above object, a part assembly structure according to one aspect of the present invention is provided such that a chevron-shaped bent part is formed extending from the part and is provided to be elastically deformable in the bending direction of the bent part, and the top part of the bent part is A plurality of tongue pieces are arranged in parallel in alternating directions, and a through hole is provided through the substrate so that each of the tongue pieces is inserted, and each of the tongue pieces has a top portion that is When in contact with the inner surface of the through hole, elastic forces in opposite directions are generated.

According to the present invention, sufficient holding strength can be ensured without requiring a large amount of deflection.

FIG. 1 is an exploded perspective view showing the parts assembly structure of the embodiment. FIG. 2 is an assembled perspective view showing the parts assembly structure of the embodiment. FIG. 3 is a side sectional view showing the parts assembly structure of the embodiment. FIG. 4 is a bottom view showing the parts assembly structure of the embodiment.

Hereinafter, modes for carrying out the invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments described below. Furthermore, the constituent elements in the embodiments below include those that can be easily imagined by those skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the components disclosed in the embodiments below can be combined as appropriate.

Although not explicitly shown in the drawings, the component assembly structure of the embodiment is applied to electrical equipment. The electrical equipment is, for example, something mounted inside the cabin of a vehicle (automobile) that is a moving body, and is a navigation system or an audio system. In the present embodiment, in the electrical device, a board 2 is arranged inside a casing, and a component 1 is attached to the board 2.

The component 1 is configured as a shield case in the embodiment, as shown in FIGS. 1 and 2. The component 1 constitutes a shield case and is made of a steel plate, and is formed by bending side plate portions 1B on the four sides of a rectangular flat plate portion 1A. The component 1 shields electromagnetic waves in the space surrounded by the flat plate part 1A, the side plate part 1B, and the surface 2A of the board 2 by attaching the bent end of the side plate part 1B toward the surface 2A of the board 2. .

The component assembly structure of the embodiment is for attaching the component 1 to the substrate 2, and is provided on the component 1 and the substrate 2.

The component 1 has a plurality of tongues (also referred to as kinks) 11 and 12. The tongue pieces 11 and 12 are provided on one (same) side plate part 1B that is bent from the flat plate part 1A.

The tongue piece 11 is configured as a plate piece formed by further extending a steel plate from the tip of the side plate portion 1B. The tongue piece 11 can be elastically deformed in the thickness direction of the plate piece and in the direction in which the plate surface faces (direction of arrow E in FIGS. 3 and 4). The tongue piece 11 is formed with a bent portion 11A. The bent portion 11A is formed by being bent into a chevron shape in the thickness direction of the plate in the tongue piece 11, in the direction in which the plate surface faces (the direction of elastic deformation, which is the direction of arrow E in FIGS. 3 and 4). In the bent portion 11A, a top portion 11Ac that projects in one direction in which the plate surface faces is formed between the tip 11Aa of the tongue 11 and the base end 11Ab of the tongue 11 in the middle of its extension.

The tongue piece 12 is configured as a plate piece formed by further extending a steel plate from the tip of the side plate portion 1B. The tongue piece 12 can be elastically deformed in the thickness direction of the plate piece and in the direction in which the plate surface faces (direction of arrow E in FIGS. 3 and 4). The tongue piece 12 is provided with the plate surface in the same direction as the tongue piece 11 (in the direction of the arrow E in FIGS. 3 and 4), and the tongue piece 12 is provided in a direction along the plate surface so as to intersect (perpendicularly) with the arrow E (direction of elastic deformation). are arranged in parallel. The tongue piece 12 is formed with a bent portion 12A. The bent portion 12A is formed in a mountain shape in the thickness direction of the plate of the tongue piece 12 in the direction in which the plate surface faces (direction of arrow E in FIGS. 3 and 4). The bent portion 12A has an apex 12Ac that projects between the tip 12Aa of the tongue 12 and the base end 12Ab of the tongue 12 in the middle of its extension.

That is, the tongue pieces 11 and 12 extend from the side plate portion 1B of the component 1 to form chevron-shaped bent portions 11A and 12A, and are provided so as to be elastically deformable in the bending direction of the bent portions 11A and 12A. , 12A are arranged in parallel with the top portions 11Ac and 12Ac of the devices arranged in alternating directions. In the component assembly structure of the embodiment, the tongue pieces 11 and 12 arranged in parallel are put together into a tongue piece set U1. Note that the tongue piece set U1 is not limited to the two tongue pieces 11 and 12, but is a collection of two or more tongue pieces arranged in parallel with the tops of the bent portions staggered in the direction, although not clearly shown in the figure. It may be a configuration. Further, in the tongue piece set U1, it is preferable that the parallel spacing between the tongue pieces 11 and 12 is as close as possible, for example, preferably 5 mm or less. Further, the tongue piece set U1 may also be provided on the other side plate portion 1B. These plurality of tongue pieces U1 can be arranged in any positional relationship with each other, but they can also be arranged with their plate surfaces (elastically deforming directions) facing each other, as shown in FIG.

The substrate 2 has a plurality of through holes 21 and 22. The through holes 21 and 22 are provided to penetrate the substrate 2 and allow the tongue pieces 11 and 12 to be inserted therein. The through holes 21, 22 have inner surfaces 21A, 22A with which the tops 11Ac, 12Ac of the bent portions 11A, 12A of the inserted tongues 11, 12 come into contact. The inner surfaces 21A, 22A are configured such that when the tops 11Ac, 12Ac of the tongues 11, 12 are brought into contact with each other, the tongues 11, 12 are elastically deformed along the arrow E in a direction opposite to the side where the tops 11Ac, 12Ac face. provided. Therefore, the tongues 11 and 12 inserted into the through holes 21 and 22 are subjected to opposite elastic forces because the alternate top portions 11Ac and 12Ac contact the inner surfaces 21A and 22A. For this reason, the component assembly structure of the embodiment functions so that the tops 11Ac, 12Ac of the tongue pieces 11, 12 are pressed against the inner surfaces 21A, 22A of the through holes 21, 22 by elastic forces in opposite directions. The frictional force between the tops 11Ac, 12Ac of 11, 12 and the inner surfaces 21A, 22A of the through holes 21, 22 acts to attach the component 1 to the substrate 2 without the component 1 floating off the surface 2A of the substrate 2. .

The component 1 also has a contact portion 13 that comes into contact with the surface (plate surface) 2A of the substrate 2. The contact portion 13 is formed by further extending a steel plate from the tip of the side plate portion 1B. The abutting portion 13 is in contact with the surface 2A of the substrate 2, and the apex 11Ac, 12Ac of the bent portion 11A, 12A of each tongue piece 11, 12 is connected to the through hole 21 without penetrating into the through hole 21, 22. , 22 at a position where it contacts the inner surfaces 21A, 22A of .

In the component assembly structure of the embodiment, the through holes 21 and 22 into which the tongue set U1 of the tongue pieces 11 and 12 arranged in parallel are inserted are defined as a through hole set U2. In addition, the through-hole set U2 is provided elsewhere so that when the other tongue piece set U1 is provided in the other side plate portion 1B, the other tongue piece set U1 can be inserted therein. In the component assembly structure of the embodiment, the tongue piece set U1 and the through hole set U2 are combined into one unit. Therefore, in the component assembly structure of the embodiment, a plurality of units can be arranged on the component 1 and the board 2.

Note that the tips 11Aa, 12Aa of the bent portions 11A, 12A of the tongue pieces 11, 12 inserted into the through holes 21, 22 of the substrate 2 penetrate through the through holes 21, 22 and protrude to the back surface of the substrate 2. Then, the tongue pieces 11 and 12 are fixed to the substrate 2 by soldering at the tips 11Aa and 12Aa that protrude from the back surface of the substrate 2.

As described above, in the component assembly structure of the embodiment, mountain-shaped bent portions 11A and 12A are formed extending from the component 1, and are provided to be elastically deformable in the bending direction of the bent portions 11A and 12A. A plurality of tongues 11 and 12 are arranged in parallel with the top portions 11Ac and 12Ac arranged in alternating directions, and through holes 21 and 22 are provided through the substrate 2 so that the respective tongues 11 and 12 are inserted thereinto. , each of the tongue pieces 11 and 12 generates elastic forces in opposite directions with the top portions 11Ac and 12Ac in contact with the inner surfaces 21A and 22A of the through holes 21 and 22.

According to this component assembly structure, the tops 11Ac, 12Ac of the bent portions 11A, 12A of the tongue pieces 11, 12 are brought into contact with the inner surfaces 21A, 22A of the through holes 21, 22, so that the tops of the tongues 11, 12 touch the through holes. Compared to a general penetrating structure, the amount of elastic deformation of the tongues 11 and 12 can be reduced. Thereby, the component assembly structure of the embodiment can reduce stress generated in the tongue pieces 11 and 12. Further, according to this component assembly structure, elastic forces in opposite directions are generated in the plurality of tongues 11 and 12 arranged in parallel, so that, for example, the amount of deflection of one tongue 11 (12) is reduced. Even if it is insufficient, the amount of deflection of the other tongue piece 12 (11) will increase. Then, the other tongue piece 12 (11) is pushed back by the load generated by the increased deflection, and both tongue pieces 11 (12), which had insufficient deflection, are placed in a position where the load can be balanced with the generated load. The load will be reduced. As a result, the component assembly structure of the embodiment distributes the deflection amount of one tongue piece 11 (12) to half of that of the conventional kink structure due to the dimensional tolerance to be considered, and By setting the generated stress to a low level, a stable holding load can be generated without requiring excessive dimensional accuracy. Therefore, the component assembly structure of the embodiment can ensure sufficient holding strength without requiring a large amount of deflection. Furthermore, the component assembly structure of the embodiment can attach the component 1 to the substrate 2 with sufficient holding force even if the component 1 is low in height and difficult to obtain a large amount of deflection due to the short length of the tongue pieces 11 and 12. It can be made possible. This also contributes to reducing the cost of parts 1. Moreover, in the component assembly structure of the embodiment, since each tongue piece 11, 12 settles at a position where the load is balanced, it is possible to suppress rotation of the component 1 away from the direction in which the load (elastic force) is generated, and the rotation of the component 1 can be suppressed. This eliminates the need for a stopping member.

Here, in the bent portions 11A and 12A, if the inclination angle from the base end 11Ab to the apex portions 11Ac and 12Ac is large with respect to the direction in which the tongue pieces 11 and 12 extend, the amount of deflection increases and the holding load tends to increase. . However, in the component assembly structure of the embodiment, a sufficient holding load can be obtained with a small amount of deflection, so the angle of inclination determines the height of the top portions 11Ac and 12Ac, and the influence of the angle is small. In addition, in the bent portions 11A, 12A, the angle of attack from the top portions 11Ac, 12Ac to the tips 11Aa, 12Aa with respect to the direction in which the tongue pieces 11, 12 extend is such that the tongue The smaller the tongue pieces 11 and 12 are, the longer the tongue pieces 11 and 12 extend in the same direction, the longer the run-up will be, and the lower the insertion force will be. tends to worsen. On the other hand, the larger the angle of attack is with respect to the extending direction of the tongues 11, 12, the greater the insertion load for inserting the tongues 11, 12 into the through holes 21, 22, and the larger the opening diameter of the through holes 21, 22. There is a need to. Therefore, in the component assembly structure of the embodiment, the angle of attack may be set in consideration of the insertion load of the tongue pieces 11, 12 into the through holes 21, 22 and the sizes of the through holes 21, 22.

Further, in the component assembly structure of the embodiment, the component 1 has a contact portion 13 that comes into contact with the surface (plate surface) 2A of the substrate 2, and each tongue is in a form in which the contact portion 13 is in contact with the surface 2A. Top portions 11Ac and 12Ac of the pieces 11 and 12 contact inner surfaces 21A and 22A of the through holes 21 and 22, respectively.

According to this component assembly structure, the apex portions 11Ac, 12Ac of each tongue piece 11, 12 can be brought into reliable contact with the inner surfaces 21A, 22A of the through holes 21, 22 by the contact portion 13, and sufficient holding strength can be achieved. Can be secured.

Moreover, in the component assembly structure of the embodiment, the plurality of tongue pieces 11 and 12 arranged in parallel and the through holes 21 and 22 into which the tongue pieces 11 and 12 are inserted are treated as one unit, and a plurality of units are arranged.

According to this component assembly structure, it is possible to provide a holding force for attaching the component 1 to the substrate 2 at a plurality of locations.

Further, in the component assembly structure of the embodiment, the component 1 is configured as a shield case.

According to this component assembly structure, easily and reliably assembling the shield case to the board 2 simplifies the manufacturing process of electrical components and prevents the shield case from coming off the board 2 due to vibrations and shocks. desirable.

By the way, in the component assembly structure of the embodiment, the board 2 is a laminated board in which a plurality of different members are laminated. The laminated board is composed of, for example, copper and epoxy resin alternately stacked on top of each other. When this laminated substrate is applied to the substrate 2 of the embodiment, the inner surfaces 21A and 22A of the through holes 21 and 22 will have projections and depressions formed by different members. In the component assembly structure of the embodiment, the top portions 11Ac and 12Ac of each of the tongues 11 and 12 are caught and contacted by the unevenness of the inner surfaces 21A and 22A. As a result, in the component assembly structure of the embodiment, the holding load is expected to increase due to the engagement of the top portions 11Ac and 12Ac, and more sufficient holding strength can be ensured.

This embodiment includes the following inventions.
[Invention 1]
A plurality of tongue pieces extending from the component to form a chevron-shaped bent part, provided to be elastically deformable in the bending direction of the bent part, and arranged in parallel with the tops of the bent parts staggered;
a through hole provided through the substrate so that each of the tongue pieces is inserted;
A component assembly structure, wherein each of the tongue pieces generates elastic forces in opposite directions when the top portion is in contact with the inner surface of the through hole.
[Invention 2]
The component has a contact portion that contacts the plate surface of the substrate, and the top portion of each tongue piece contacts the inner surface of the through hole with the contact portion contacting the plate surface. Component assembly structure according to invention 1.
[Invention 3]
The component assembly structure according to invention 1 or 2, wherein a plurality of the tongue pieces arranged in parallel and the through hole into which the tongue pieces are inserted form one unit, and a plurality of the units are arranged.
[Invention 4]
The component assembly structure according to any one of inventions 1 to 3, wherein the component is configured as a shield case.

1 Parts 11, 12 Tongue pieces 11A, 12A Bent parts 11Ac, 12Ac Top part 13 Contact part 2 Board 2A Surface (plate surface)
21, 22 Through hole 21A, 22A Inner surface

Claims (4)

A plurality of tongue pieces extending from the component to form a chevron-shaped bent part, provided to be elastically deformable in the bending direction of the bent part, and arranged in parallel with the tops of the bent parts staggered;
a through hole provided through the substrate so that each of the tongue pieces is inserted;
A component assembly structure, wherein each of the tongue pieces generates elastic forces in opposite directions when the top portion is in contact with the inner surface of the through hole. The component has a contact portion that contacts the plate surface of the substrate, and the top portion of each tongue piece contacts the inner surface of the through hole with the contact portion contacting the plate surface. The parts assembly structure according to claim 1. 2. The component assembly structure according to claim 1, wherein the plurality of tongue pieces arranged in parallel and the through hole into which the tongue pieces are inserted form one unit, and a plurality of the units are arranged. The component assembly structure according to claim 1, wherein the component is configured as a shield case.

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