JPH061805Y2 - Component mounting structure of sandwich structure consisting of outer layer and core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a component mounting structure of a sandwich structure including an outer skin layer and a core, and more particularly to a vehicle body component mounting structure including the sandwich structure.

[Conventional technology]

In recent years, for the purpose of improving productivity by reducing the weight of a vehicle and reducing the number of parts, it has been proposed to use a composite structure such as a reinforced plastic in a vehicle body, and it has been partially put into practical use.

Such a composite structure is generally a so-called sandwich structure in which a core material is covered on both sides with an outer skin layer, and a foamed plastic body is used as the core material (Japanese Patent Publication No. 46/46).
-36329, Japanese Patent Publication No. 55-43912, Japanese Utility Model Publication No. 63-30276, U.S. Pat. No. 455927, U.S. Pat. No. 4,573,707) and the use of honeycomb structures (Japanese Patent Laid-Open No. 47-32521, Japanese Utility Model Publication No. 47-32521). Kaisho 57-1
No. 14774, No. 62-174935, No. 62-174978, etc.)
Have been proposed. It has also been proposed to use a structure in which a core part of the sandwich structure is partially hollow in a vehicle body (Japanese Utility Model Publication No. 62-166136, etc.).

[Problems to be solved by the device]

However, in such a sandwich structure, if it is attempted to fix the component directly to the core material by using a screw or the like, it is difficult to fix the screw, and there is a problem in strength in attaching the stool. There is also a problem that the strength is insufficient when the component is attached to the surface of the outer skin layer simply by welding or adhesion.

Therefore, an object of the present invention is to provide a structure for mounting various parts to a sandwich structure composed of an outer skin layer and a core with sufficient strength, and in particular, a part mounting portion, a part mounting metal fitting, and a part mounting of the sandwich structure. Is to provide the structure.

[Means for Solving the Problems]

As a result of earnest research in view of the above problems, the present inventor has found that a recess for forming a tapered portion is formed in a component mounting portion of a sandwich structure, and a metal fitting for mounting a component having an inward convex portion having a tapered shape complementary to the recessed portion. By fixing the to the concave part of the sandwich structure with an adhesive, the load applied to the parts attached to the metal fitting can be smoothly transmitted to a large area of the entire outer skin layer of the sandwich structure, and thus the stress can be dispersed to strengthen the structure. The inventors discovered that a component mounting structure can be obtained, and conceived the present invention.

That is, in the component mounting portion of the sandwich structure of the present invention, at least one of the plastic skin layers covering the core from both sides forms a tapered concave portion having an expanded side surface portion and a flat bottom surface portion. As described above, the bottom surface portion is joined to another outer skin layer.

Further, the component mounting bracket fixed to the component mounting portion of the sandwich structure has a bottom plate and a pair of side plates standing upright from substantially both sides of the bottom plate, and at least one of the side plates is the sandwich structure. It is characterized in that it has an inward convex portion having a tapered shape complementary to the concave portion.

Further, the structure for attaching a component to the component mounting portion of the sandwich structure of the present invention has a bottom plate and a pair of side plates standing upright from substantially both sides of the bottom plate, at least one of the side plates being the sandwich structure. Is attached to the tapered concave portion of the sandwich structure, and the inner surface of the tapered concave portion of the sandwich structure and the component mounting member are attached to the tapered concave portion of the sandwich structure. It is characterized in that the surface of the tapered convex portion of the metal fitting is fixed by an adhesive.

[Examples and functions]

FIG. 1 is a partial sectional view showing a component mounting portion of a sandwich structure according to an embodiment of the present invention. The sandwich structure is composed of a pair of outer skin layers 1 and 1 provided on both sides and a foam layer 2 which is a core material, and the outer skin layers 1 and 1 cover the foam layer 2 entirely. At the ends of the sandwich structure, the outer skin layers 1 and 1 on both sides are joined to form a flange portion 3.

In the component mounting portion 6 of this sandwich structure, tapered recesses 4 are symmetrically formed in the outer skin layers 1 and 1 on both sides. Each concave portion 4 is composed of an expanded side surface portion 4a and a flat bottom surface portion 4b, and the outer skin layers 1 and 1 are joined together at the bottom surface portion 4b. In this embodiment, the recess 4 is open to the end of the sandwich structure, and the bottom surface 4b is continuous with the flange 3. Further, the widened side surface portion 4a is vertically long, and includes a flat side surface portion and a conical side surface portion. It should be noted that the bottom surface portion 4b is provided with a plurality of holes 5 through which bolts for mounting the metal fittings pass.

FIG. 2 is a perspective view showing a component mounting bracket 7 fixed to the component mounting portion shown in FIG. The component mounting bracket 7 is the bottom plate 8
And a pair of side plates 9 standing upright from substantially both sides of the bottom plate 8,
9 and.

The pair of side plates 9 and 9 have inner convex portions 10 and 10 having a tapered shape complementary to the concave portion 4 of the sandwich structure shown in FIG.
Are formed respectively. This pair of inward projections 1
Bottom part 4b formed by joining both skin layers in the gap between 0 and 10
Is inserted, the gap is set to be equal to or slightly larger than the thickness of the bottom surface portion 4b. Inward projections 10, 10
A plurality of bolt holes 12 are provided in the facing surfaces 11, 11 at positions corresponding to the bolt holes 5.

The bottom plate 8 of the metal fitting has a plurality of bolt holes 15 for attaching components.
Is provided, and the folded-back portion 13 is provided at the edge of the bottom plate 8.
Is attached. Further, a cutout 14 for allowing the flange portion 3 of the sandwich structure to pass through is provided in the center of the folded portion 13 which is on the side perpendicular to both side plates 9, 9.

FIG. 3 is a partially cutaway perspective view showing a state in which the component mounting metal fitting 7 shown in FIG. 2 is fixed to the component mounting portion 6 of the sandwich structure shown in FIG. 1, and FIG. It is an AA partial sectional view of the component attachment structure shown in FIG.

As is apparent from FIG. 4, the concave portions 4 and 4 of both outer skin layers 1 and 1 of the sandwich structure are the inner convex portions of the component mounting bracket 7.
10 and 10 are in close contact with the entire surface. In this state, the concave portions 4 and 4 and the inward convex portions 10 and 10 are firmly fixed with an adhesive. As shown in FIG. 4, the bolt holes 12 of the inward projections 10 and 10 of the side plates 9 and 9 and the bolt holes 5 of the bottom surface 4a of the recesses 4 and 4 are further aligned. It is fixed by a bolt 16 penetrating therethrough.

The parts are attached by bolting the holes 15 provided in the bottom plate 8 of the parts attaching bracket 7 with bolts. The load of the attached component is transmitted to both side plates 9 and 9 through the bottom plate 8 of the component attaching metal fitting 7, and it is passed through both inward convex portions 10 and 10 and is fixed to the concave portions 4 of both outer skin layers 1 and 1. 4 is transmitted almost evenly.

Tapered inward projections 1 complementary to the tapered recesses 4 and 4
Since 0 and 10 are firmly fixed, even if a load is applied in any direction, the structure is such that the load is received by one of the stronger parts.

That is, when an upward load is applied in the drawing,
The conical side surface portions above the recesses 4 and 4 receive the load, and when the load is applied downward, the faces 1a and 9a carry the load. Generally, the shear strength of the adhesive is significantly larger than the peel strength, so that the structure subjected to the load by this shear force is extremely advantageous in terms of strength.

Even when a load is applied in the left-right direction, the recesses 4, 4
The left and right side surfaces of the are to receive the load.

Moreover, even if a load is applied in the twisting direction, since the tapered surfaces are fixed to each other, the entire bonded surface receives the twisting load. Moreover, since the inner convex portions 10, 10 are fixed on both sides, any torsional load in either direction must be applied to the concave portion at any part of the inner convex portions 10, 10 on both sides as a pressing force against the concave portion. It acts (that is, the force in the peeling direction at one portion is always the force in the pressing direction at another portion). Therefore, that portion is sufficiently supported. Therefore, the peeling force does not act on the adhesive surface between the concave portions 4 and 4 and the inner convex portions 10 and 10 due to the torsional load. Even if one of the outer skin layers is flat, the outer skin layers 1 and 1 are fixed to both side plates of the metal fitting on both sides of the recess 4 and the flat portion at the same time, so that the outer skin layers 1 and 1 are also sufficiently resistant to the torsion load. To be strong.

As described above, the load due to the component is applied to the concave portions 4 of the outer skin layers 1 and 1,
4 and the inward projections 10 and 10 of the fitting 7 and 1a and 2 of FIG.
Although it can be sufficiently supported only by adhesion with 9a in the figure, a bolt 16 is attached to the bottom surface portion 4b as a reinforcement and a fail-safe so as not to fall off if the adhesion portion should come off.

Further, the folded-back portion 13 provided on the bottom plate 8 of the metal fitting is for reinforcing the bottom plate 8 of the metal fitting, and notches 14 and 14 are provided in a part of the folded-back portion 13 to pass through the flange portion 3 of the sandwich structure. This is because the sandwich structure itself is kept strong by leaving the flange portion 3 left.

The outer skin layers 1 and 1 of the sandwich structure can be formed by various types of plastics, but fiber-reinforced plastics are preferable, because they have good formability and can be formed into a structure having a complicated shape. It is preferable to use a thermoplastic resin as the matrix material, and carbon fiber reinforced nylon is particularly preferable from the viewpoints of moldability, strength and durability. The core layer 2 may be a foamed plastic body, a honeycomb core, or a hollow shape, but from the viewpoint of moldability, it is preferably formed of a foamed plastic body, particularly a polyurethane foam body.

Although the component mounting structure of the present invention has been described with reference to the accompanying drawings, the present invention is not limited to this and various modifications can be made without departing from the spirit of the present invention. For example, instead of symmetrically forming the concave portions in the outer skin layer, one of the side plates may be left flat, and similarly, a mounting bracket in which the inner convex portion is formed on only one side plate may be used. Further, the shape of the concave portion of the outer skin layer is not limited to the vertically long shape, and may have various shapes depending on the purpose as long as it has a tapered side surface.

[Effect of device]

As described in detail above, the component mounting structure of the present invention is a component having a tapered concave portion in a sandwich structure composed of an outer skin layer and a core, and having a tapered inner convex portion complementary to the concave portion. By bonding the mounting metal fitting to the recess of the sandwich structure, the load of the component can be smoothly transmitted to the sandwich structure. Further, since the component mounting bracket is attached to the sandwich structure by bonding the tapered concave portion and the inward convex portion having a tapered shape complementary to this concave portion, any vertical, horizontal, and twisting of the component The component mounting structure is also robust against directional forces.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a component mounting portion of a sandwich structure according to an embodiment of the present invention, and FIG. 2 shows a component mounting bracket joined to the component mounting portion shown in FIG. FIG. 3 is a perspective view, FIG. 3 is a partially broken perspective view showing a state in which the component mounting bracket shown in FIG. 2 is fixed to the component mounting portion shown in FIG. 1, and FIG. It is an AA partial sectional view. 1 ... Outer skin layer 2 ... Core (foam layer) 3 ... Flange portion 4 ... Recessed portion 4a ... Recessed portion side portion 4b ... Recessed portion bottom portion 5, 12, 15 ... Bolt Holes 6 ... Component mounting part 7 ... Component mounting bracket 8 ... Bottom plate 9 ... Side plate 10 ... Inward convex part 14 ... Flange notch 16 ... Bolt

Claims (5)

[Scope of utility model registration request] 1. A component mounting portion of a sandwich structure comprising a core whose both surfaces are covered with a plastic skin layer, wherein at least one skin layer has a tapered shape having an expanded side surface portion and a flat bottom surface portion. The component mounting portion of the sandwich structure, wherein the bottom surface portion is joined to the other outer skin layer so as to form a concave portion. 2. The component mounting portion of the sandwich structure according to claim 1, wherein the tapered recess is formed at an end of the sandwich structure, and thus the recess is provided at an end of the sandwich structure. Part attachment part of the sandwich structure characterized by being open. 3. The component mounting portion of the sandwich structure according to claim 2, further comprising a flange portion formed by joining ends of the outer skin layer, the bottom surface portion of the recess being continuous with the flange portion. The component mounting portion of the sandwich structure characterized in that 4. A component mounting bracket fixed to a component mounting portion of the sandwich structure according to claim 1, wherein a bottom plate is provided.
A part having a pair of side plates standing upright from substantially both sides of the bottom plate, and at least one of the side plates having an inward convex portion having a tapered shape complementary to the concave portion of the sandwich structure. Mounting bracket. 5. A structure for attaching a component to a component mounting portion of a sandwich structure according to claim 1, comprising a bottom plate and a pair of side plates standing upright from substantially both sides of the bottom plate,
At least one of the side plates has a component mounting bracket having an inward convex portion that is tapered complementarily to the concave portion of the sandwich structure, and is attached to the tapered concave portion of the sandwich structure. The component mounting structure of the sandwich structure, wherein the inner surface of the tapered concave portion and the surface of the tapered convex portion of the component mounting bracket are fixed by an adhesive.