JPH077270Y2 - Vehicle body upper arm mounting structure consisting of sandwich structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a vehicle body upper arm mounting structure including a sandwich structure in which both sides of a core layer are covered with a pair of skin layers.

[Conventional technology]

In recent years, for the purpose of improving the productivity by reducing the weight of the 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 some have been put to practical use.

Such a composite structure is generally a so-called sandwich structure in which a core material is coated with outer layers from both sides, and a foamed plastic body is used as the core material (Japanese Patent Publication No.
−36329, Japanese Examined Patent Publication 55-43912, Actual Development Sho 63-30276,
U.S. Pat. No. 4,559,274, U.S. Pat. No. 4,573,707, etc.) and the use of honeycomb structures (JP-A-47-32521, JP-A-57-114774, JP-A-62-174935, JP-A-62935). -1749
No. 78) is proposed. It has also been proposed to use a structure in which the core material 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 a 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 of component mounting. In particular, since the upper arm is the part that receives vibration from the wheels, it is not enough to attach it to the surface of the outer skin layer not only by fixing it with the above-mentioned screw, but also by simply welding or adhering it. There is a problem that the progress of destruction progresses quickly.

Therefore, an object of the present invention is to provide a structure for attaching an upper arm to a vehicle body having a sandwich structure with sufficient strength, and in particular, an upper arm attachment portion of the sandwich structure, an upper arm attachment metal fitting and an upper arm attachment. 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 formed a tapered concave portion in the upper arm mounting portion of the vehicle body made of the sandwich structure, and has a tapered inner convex portion complementary to the concave portion. By fixing the upper arm mounting metal fittings that it has to the recesses of the sandwich structure with an adhesive, the load applied to the upper arms attached to the metal fittings can be smoothly transmitted to a wide area of the entire outer skin layer of the sandwich structure, and thus stress It was discovered that a strong upper arm mounting structure can be obtained by making dispersion, and the present invention was conceived.

That is, the upper arm mounting portion of the vehicle body of the present invention is provided at the front and rear two places at the lower end of the frame portion of the vehicle,
In each mounting portion, both outer skin layers of the sandwich structure constituting the vehicle body are recessed so as to form tapered recesses each having a flat bottom surface portion and a flared side surface portion. Bottom surfaces are joined together, and the both recesses are open to the end side of the vehicle body.

Further, the upper arm attachment fitting fixed to the upper arm attachment portion includes a bottom plate, a pair of first side plates standing upright from substantially both sides of the bottom plate, and extending from the bottom plate to the opposite side of the first side plate. A second side plate that supports the upper arm, and the pair of first side plates has a pair of inward convex portions that are tapered complementarily to the concave portion of the vehicle body.

Further, the structure for attaching the upper arm to the upper arm mounting portion of the present invention is such that the bottom plate, the pair of first side plates standing upright from substantially both sides of the bottom plate, and the pair of first side plates standing upright from substantially both sides of the bottom plate. One side plate and a second side plate that supports an upper arm extending from the bottom plate to the opposite side of the first side plate, and the pair of first side plates have a recess in each mounting portion of the vehicle body. An upper arm mounting bracket provided with a pair of complementary inward convex portions is attached to a tapered recess of the vehicle body, and the inner surface of the tapered recess of the vehicle and the upper arm. It is characterized in that the surface of the tapered convex portion of the mounting bracket is fixed by an adhesive. Further, in the mounting structure of the present invention, more preferably, the inward convex portion of the bonded metal fitting is mechanically coupled with a bolt or the like to reinforce the mounting of the metal fitting.

[Examples and functions]

FIG. 1 is a partially cutaway perspective view showing an upper arm mounting portion according to an embodiment of the present invention. The vehicle body is composed of a sandwich structure in which a pair of outer skin layers 1 and 1 covers both sides of 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 upper arm attachment portion 6 of this sandwich structure, the outer surface skin layers 1 and 1 on both sides are tapered recesses 4
Are formed symmetrically. Each recess 4 is an expanded side surface 4a
And a flat bottom portion 4b, and the outer skin layers 1 and 1 are joined together at the bottom portion 4b. The concave portion 4 is open to the end side of the sandwich structure, and the bottom surface portion 4b is continuous with the flange portion 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 schematic side view showing a forming portion when the upper arm mounting portion shown in FIG. 1 is formed on a vehicle body as a mounting portion for a front upper arm. The front upper arm attachment portions 8 and 9 are provided at the lower end portion of the front frame portion 7, which is a part of the vehicle body. There are a pair of left and right front frame parts, and the front frame parts extend forward from the center of the body inside the left and right front wheels 10 so as to be substantially parallel thereto. The front frame portion 7 shown in FIG. 2 is the left front frame portion, and the right front frame portion (not shown) is similarly provided with the front upper arm attachment portion.

The recesses of the mounting portions 8 and 9 do not necessarily have to have the same size, but both have the same shape as the recess 4 shown in FIG. Also, the mounting portion of the rear upper arm can be formed on the rear frame portion of the vehicle body as in the case of the front upper arm.

FIG. 3 is a perspective view showing the upper arm mounting bracket 14 fixed to the upper arm mounting portion shown in FIG. The upper arm mounting bracket (14) has a bottom plate (20) and a pair of side plates (15, 15) standing upright from substantially both sides of the bottom plate (20). The pair of side plates 15 and 15 are respectively formed with inward convex portions 16 and 16 having a tapered shape complementary to the concave portion 4 of the sandwich structure shown in FIG. Since the bottom surface portion 4b formed by joining both outer skin layers is inserted into the gap between the pair of inward convex portions 16 and 16, the distance is set to be equal to or slightly larger than the thickness of the bottom surface portion 4b. There is. In addition, the inner convex portions 16, 16 face each other.
A plurality of bolt holes 18 are provided at positions corresponding to the bolt holes 5 in the holes 19.

On the bottom plate 20 of the metal fitting, another side plate 23 for attaching the upper arm extends to the opposite side of the side plate 15, and the edge portion of the side plate 23 has a folded portion 23a. Further, the side plate 23 is provided with a hole 25 for mounting the upper arm.

Further, a folded portion 21 is attached to the edge of the bottom plate 20.
Further, a cutout 22 for allowing the flange portion 3 of the sandwich structure to pass is provided in the center of the folded portion 21 which is on the side perpendicular to both side plates 15, 15.

FIG. 4 is a partially cutaway perspective view showing a state in which the upper arm mounting bracket 14 shown in FIG. 3 is fixed to the upper arm mounting portion 6 of the sandwich structure shown in FIG. 1, and FIG. , A-A of the upper arm mounting structure shown in FIG.
FIG.

As is apparent from FIG. 5, the side surfaces 4a, 4a and the bottom surfaces 4b, 4b of the recesses 4, 4 of both outer skin layers 1, 1 of the sandwich structure are the inner protrusions 16, 16 of the upper arm mounting bracket 14. It is in close contact with the entire surface. In this state, the concave portions 4 and 4 and the inward convex portions 16 and 16 are firmly fixed with an adhesive. As shown in FIG. 5, further, the bolt holes 18 of the inner convex portions 16 and 16 of the side plates 15 and 15 and the bottom surface portion 4b of the concave portions 4 and 4 are formed.
It is aligned with the bolt hole 5 and is fixed by a bolt 28 penetrating both.

Here, the upper arm is attached by being fitted into a hole 25 provided in the side plate 23, and the attachment is as schematically shown in FIG.

The stress exerted on the attached upper arm is transmitted through the both side plates 15, 15 of the upper arm attachment metal fitting 14 to the recesses 4, 4 of both outer skin layers 1, 1 fixed thereto substantially evenly. Since the tapered concave portions 4 and 4 and the tapered inner convex portions 16 and 16 are firmly fixed to each other, even if a load is applied in any direction, the load is applied to a portion having a larger strength. It is structured to be received at.

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 surface 1a of FIG. 1 and the surface 15a of FIG. In general, the shear strength of the adhesive is significantly higher than the peel strength, so that the structure subjected to the load by this shear force is extremely advantageous in 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. In addition, since the inward convex portions 16 and 16 are fixed on both sides, the torsional load in either direction must be applied to the concave portion at any part of the inner convex portions 16 and 16 on both sides. 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, due to the torsional load, the peeling force does not act on the adhesive surface between the concave portions 4 and 4 and the inner convex portions 16 and 16.

As described above, the load exerted by the upper arm depends on the outer skin layers 1, 1
The recesses 4 and 4 of the mounting bracket 14 and the inward projections 16 and 16 of the mounting bracket 14 and the adhesive bonding between 1a of FIG. 1 and 15a of FIG. 3 are sufficient to support the bottom surface 4b for reinforcement and failsafe. The bolts 28 are attached so that they will not fall off if the adhesive is peeled off.

Further, the folded-back portion 21 provided on the bottom plate 20 of the metal fitting is for reinforcing the bottom plate 20 of the metal fitting, and notches 22 and 22 are provided in a part of the folded-back portion 21 to pass through the flange portion 3 of the front frame portion. This is because the front frame portion 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 of various plastics, but fiber reinforced plastics are preferable, moldability is good, molding time is shortened, and it is possible to mold to a structure having a complicated shape. Therefore, it is preferable to use a thermoplastic resin as the matrix material. Particularly, carbon fiber reinforced nylon is 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 upper arm 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.
Further, the mechanical connection in the recess is not limited to the bolt, and other means such as a rivet may be used.

[Effect of device]

As described above in detail, the upper arm mounting structure of the present invention forms a tapered concave portion in the vehicle body formed of the sandwich structure in which the core layer is covered with the outer skin layer, and has a tapered shape complementary to the concave portion. By bonding the upper arm mounting bracket having the inward convex portion to the concave portion of the vehicle body, the load applied to the upper arm can be smoothly transmitted to the vehicle body.

Further, since the upper arm mounting bracket is attached by adhesion of the tapered concave portion provided in the vehicle body and the inward convex portion having a tapered shape complementary to this concave portion,
The upper arm mounting structure will be firm even with respect to vertical, horizontal, and twisting forces applied to the upper arm. Further, the fastening with bolts serves as a fail-safe in case the adhesive portion is peeled off.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an upper arm mounting portion according to an embodiment of the present invention, FIG. 2 is a schematic side view showing a forming portion of the upper arm mounting portion, and FIG. FIG. 4 is a perspective view showing an upper arm attachment fitting fixed to the upper arm attachment portion shown in FIG. 1, and FIG. 4 is a perspective view showing an upper arm attachment portion shown in FIG.
FIG. 5 is a partially cutaway perspective view showing a state in which the upper arm attachment fitting shown in the figure is fixed, and FIG. 5 is a partial sectional view taken along line AA of FIG. 1 ... Outer skin layer 2 ... Core material (foam layer) 3 ... Flange portion 4 ... Recessed portion 4a ... Recessed portion side portion 4b ... Recessed portion bottom portion 5, 18 ... Bolt holes 6, 8, 9 ... … Upper arm mounting part 7 …… Front frame part 11 …… Upper arm 14 …… Upper arm mounting bracket 15 …… Side plate 16 …… Inward convex part 20 …… Bottom plate 21 …… Bottom plate flange 22 …… Vehicle body flange Notch 28 …… Bolt

Claims (4)

[Scope of utility model registration request] 1. An upper arm mounting portion of a vehicle body comprising a sandwich structure in which both sides of a core layer are covered with a pair of plastic skin layers, said mounting portions being provided at least at two front and rear positions on a lower end portion of a frame portion of the vehicle. In each of the mounting portions, the pair of skin layers are recessed so as to form a tapered recess having an expanded side surface portion and a flat bottom surface portion, and the bottom surfaces of the two recessed portions are formed. The upper arm attachment portion is characterized in that the portions are joined, and both the recessed portions that are joined are open to the end side of the vehicle body. 2. The upper arm mounting metal member fixed to the upper arm mounting portion according to claim 1, wherein a bottom plate is provided,
A pair of first side plates that are upright from substantially both sides of the bottom plate and a second side plate that supports an upper arm that extends from the bottom plate to the opposite side of the first side plate; The upper arm mounting bracket, wherein the side plate has a pair of inward convex portions that are tapered complementarily to the tapered concave portions of the respective mounting portions of the vehicle body. 3. The structure according to claim 1, wherein the upper arm is attached to the upper arm attachment portion, the bottom plate, a pair of first side plates standing upright from substantially both sides of the bottom plate, and the pair of first side plates extending from the bottom plate. A second side plate supporting an upper arm extending to the opposite side of the one side plate, wherein the pair of first side plates has a tapered shape complementary to the tapered concave portion in each mounting portion of the vehicle body. An upper arm mounting bracket provided with a pair of inward projections is mounted in a tapered recess of the vehicle body, and an inner surface of the tapered recess of the vehicle and a first of the upper arm mounting brackets. An upper arm mounting structure for a vehicle body, characterized in that the surface of the tapered convex portion of the side plate is fixed by an adhesive. 4. The upper arm mounting structure according to claim 3, wherein the metal fitting is attached by a mechanical fastening method at a portion where the inward convex portion of the mounting metal fitting and the tapered concave portion of the mounting portion are fixed to each other. Upper arm mounting structure characterized by being reinforced.