JPH077269Y2 - Vehicle body front suspension beam mounting structure consisting of sandwich structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a vehicle body front suspension beam mounting structure including a sandwich structure in which both sides of a core layer are covered with a pair of outer 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 the front suspension beam by directly using a screw or the like on the core material, it is difficult to fix the screw, and there is also a problem in terms of mounting strength of the front suspension beam. In particular, since the front suspension beam is a portion that receives the weight of the vehicle body and is subjected to vibrations, there is a problem in that the strength is insufficient not only when it is fixed by the screw but also when it is attached to the surface of the outer skin layer by welding or adhesion.

Therefore, an object of the present invention is to provide a structure for mounting a front suspension beam on a vehicle body having a sandwich structure with sufficient strength, and particularly to a front suspension beam mounting portion of the sandwich structure, a front suspension beam mounting bracket, and It is to provide a front suspension beam mounting 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 front suspension beam mounting portion of a vehicle body composed of a sandwich structure, and has a tapered inner convex portion complementary to the concave portion. By fixing the front suspension beam attachment metal fitting having the to the concave portion of the sandwich structure with an adhesive, the load applied to the front suspension beam attached to the metal fitting is smoothly transmitted to a wide area of the entire outer skin layer of the sandwich structure, The inventors discovered that a strong front suspension beam mounting structure can be obtained by attempting to disperse stress, and arrived at the present invention.

That is, the front suspension beam mounting portion of the vehicle body of the present invention is provided at two front and rear portions at the lower end portion of the front frame portion of the vehicle, and at each mounting portion, both outer skin layers of the sandwich structure constituting the vehicle body are flat. A concave bottom portion and a flared side surface portion so as to form a tapered concave portion, the bottom portions of the two concave portions are joined, and both concave portions are opened to the end side of the vehicle body. It is characterized by

Further, the front suspension beam attachment fitting fixed to the front suspension beam attachment portion has a bottom plate and a pair of side plates standing upright from substantially both sides of the bottom plate, and the pair of side plates is a recess of the vehicle body. And a pair of inward convex portions having a tapered shape complementary to the above.

Further, the structure for attaching the front suspension beam to the front suspension beam mounting portion of the present invention has a bottom plate and a pair of side plates standing upright from substantially both sides of the bottom plate, and the side plates have a pair of recesses of the vehicle body. A front suspension beam mounting bracket having a pair of inward convex portions having a complementary tapered shape is attached to a tapered concave portion of the vehicle body, and the inner surface of the tapered concave portion of the vehicle and the front suspension beam It is characterized in that the surface of the tapered convex portion of the mounting bracket is fixed by an adhesive.

[Examples and functions]

FIG. 1 is a partially cutaway perspective view showing a front suspension beam 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 front suspension beam attachment portion 6 of this sandwich structure, tapered outer 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.
In, the outer skin layers 1 and 1 are joined. 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 portion where the front suspension beam attachment portion shown in FIG. 1 is formed. The front suspension beam 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,
Similarly, a front suspension beam attachment portion is also provided on the right front frame portion (not shown).

In the front suspension beam mounting parts 8 and 9,
The mounting portion 9 located on the rear portion is provided at a position slightly higher than the mounting portion 8 on the front side. Further, the opening direction of the recess formed in the mounting portion is a downward direction in the mounting portion 8 and a diagonally downward direction in the vehicle front direction in the mounting portion 9.

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.

FIG. 3 is a perspective view showing the front suspension beam mounting bracket 12 fixed to the front suspension beam mounting portion shown in FIG. The front suspension beam mounting bracket 12 has a bottom plate 13 and a pair of side plates 14 and 14 which stand upright from substantially both sides of the bottom plate 13.

The pair of side plates 14 and 14 have inward convex portions 15 and 15 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 where both skin layers are joined in the gap between 5 and 15
Is inserted, the gap is set to be equal to or slightly larger than the thickness of the bottom surface portion 4b. Also, the inward projections 15, 15
A plurality of bolt holes 17 are provided in the facing surfaces 16, 16 at positions corresponding to the bolt holes 5.

The bottom plate 13 of the metal fitting is provided with a plurality of bolt holes 20 for mounting the front suspension beam.
A fold-back portion 18 is attached to the edge of the. Also the folded part
A notch 19 for allowing the flange portion 3 of the sandwich structure to pass through is provided at the center of the ones on the sides perpendicular to the both side plates 14 and 14 of 18.

FIG. 4 is a partially cutaway perspective view showing a state in which the front suspension beam mounting member 6 shown in FIG. 3 is fixed to the front suspension beam mounting portion 6 of the sandwich structure shown in FIG. The drawing is a partial cross-sectional view taken along the line AA of the front suspension beam mounting structure shown in FIG.

As is apparent from FIG. 5, the concave portions 4 and 4 of both outer skin layers 1 and 1 of the sandwich structure are in close contact with the inner convex portions 15 and 15 of the front suspension beam mounting bracket 12 over the entire surface. In this state, they are in close contact. In this state, the concave portions 4, 4 and the inward convex portion 15,
15 is firmly fixed with an adhesive. As shown in FIG. 5, the bolt holes 17 of the inner convex portions 15 and 15 of the side plates 14 and 14 and the bolt holes 5 of the bottom surface portion 4b of the concave portions 4 and 4 are further aligned, and both of them are aligned. It is fixed by a bolt 21 penetrating therethrough.

FIG. 6 shows inward projections of the beam mounting portions 8 and 9 of the front frame portion 7 shown in FIG. 2, which have shapes similar to those of the metal fittings shown in FIG. FIG. 9 is a schematic side view showing a state in which the metal fittings 22 and 26 having the are attached and the front suspension beam 30 is attached.

The front suspension beam 30 is attached to the front frame portion 7 at both ends thereof, and the attachment is made by bolting holes in the bottom plates 24 and 28 of the metal fittings 22 and 26 fixed to the attaching portions 8 and 9 at the positions shown by arrows in the figure. It is done by tightening.

A lateral leaf suspension passes through a box 31 provided in the middle of the front suspension beam 30. Further, the front suspension beam 30 is bent so that the rear portion thereof is directed obliquely upward, and is attached so that the attachment portion 9 at the rear end portion thereof is substantially perpendicular to the bottom plate 28 of the attachment fitting 26. Therefore, the axial direction of the front suspension beam 30 and the mounting direction of the bolt for mounting the beam 30 are substantially the same.

By mounting the front suspension beam 30 on the front frame portion 7 in this manner, the external force applied from the front of the vehicle is received by the bottom plate 28 of the mounting metal fitting 26, and is further passed through the side plate of the metal fitting 26 to the outer skin layer of the front frame portion 7. Therefore, the force can be smoothly transmitted to the floor of the vehicle body. That is, in the beam mounting portion 9, the beam
The force applied from the front through 30 is received by the entire sheared surface of the side plate of the metal fitting 26, and can be transmitted to the outer skin layer of the front frame portion without concentrating the force on a specific portion. Further, at this time, since the bolt fastening direction for attaching the beam 30 to the metal fitting 26 coincides with the force direction, the bolt is less likely to be broken.

As described above, a large external force seen from a collision or the like from the front is transmitted to the entire vehicle body through the beam attachment metal fitting 26 fixed to the beam attachment portion 9, so that the external force can be received by the large mass of the entire vehicle body. Good impact resistance.

The front suspension beam mounting structure of the present invention is robust not only to the force from the front side but also to the force from all directions. Since both the mounting portions 8 and 9 have the same shape as the mounting portion 6 shown in FIG. 1, the beam mounting portion 6 of FIG. 1 will be taken as an example, and referring again to FIGS. It will be described below that the mounting structure is robust against forces from all directions.

The load applied to the front suspension beam is transmitted to the both side plates 14 and 14 via the bottom plate 13 of the beam mounting bracket 12, and the concave portions of the outer skin layers 1 and 1 which are fixed to the both side plates 14 and 14 are fixed thereto. 4 and 4 are transmitted almost evenly.

Tapered inward projections 1 complementary to the tapered recesses 4 and 4
Since 5 and 15 are firmly fixed, even if a load is applied in any direction, the structure is such that the load will be 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 14a carry the load. 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. Moreover, since the inward convex portions 15 and 15 are fixed on both sides, the torsional load in either direction is always applied to the concave portion at any part of the inner convex portions 15 and 15 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, the peeling force does not act on the adhesive surface between the concave portions 4 and 4 and the inward convex portions 15 and 15 due to the torsional load.

As described above, the load due to the front suspension beam is applied to the concave portions 4 and 4 of the outer skin layers 1 and 1 and the inward convex portion 1 of the mounting bracket 12.
5 and 15 and 1a in Fig. 1 and 14a in Fig. 3 can be sufficiently supported, but the bottom surface 4b serves as a reinforcement and a fail-safe so that if the adhesive part comes off, it will not fall off. Bolts 21 are installed.

Further, the folded-back portion 18 provided on the bottom plate 13 of the metal fitting is for reinforcing the bottom plate 13 of the metal fitting, and notches 19 and 19 are provided in a part of the folded-back portion 18 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 front suspension beam mounting structure of the present invention has been described with reference to the accompanying drawings, the present invention is not limited thereto and various modifications can be made without departing from the concept 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 front suspension beam mounting structure of the present invention has a tapered concave portion formed in the vehicle body formed of a sandwich structure in which the core layer is covered with the outer skin layer, and the tapered concave shape is complementary to the concave portion. By bonding the front suspension beam mounting bracket having the inward convex portion to the concave portion of the vehicle body, the load applied to the front suspension beam can be smoothly transmitted to the vehicle body.

Further, the front suspension beam mounting bracket is attached to the front suspension beam because it is attached by bonding a tapered concave portion provided on the vehicle body and an inward convex portion having a tapered shape complementary to the concave portion. The front suspension beam mounting structure will be robust against vertical, horizontal, and torsional forces.

Furthermore, the front suspension beam is bent and attached so that the rear part faces slightly upward, and at the mounting part at the rear end of the beam, the beam rear part is attached to the bottom plate of the beam mounting bracket that is tilted forward to the front of the vehicle. Since the axis direction of the is almost vertical, when a shock is received from the front through the beam, the stress of the other will be received by the bottom plate of the beam mounting bracket, and further smoothly through the side plate of the mounting bracket. Can be transmitted to the entire vehicle,
Therefore, it has a particularly firm mounting structure against shocks from the front.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a front suspension beam mounting portion according to an embodiment of the present invention, FIG. 2 is a schematic side view showing a forming portion of the front suspension beam mounting portion, and FIG. FIG. 4 is a perspective view showing a front suspension beam attachment fitting fixed to the front suspension beam attachment portion shown in FIG. 1, and FIG. 4 is a front suspension beam attachment portion shown in FIG. FIG. 6 is a partially cutaway perspective view showing a state in which a suspension beam mounting bracket is fixed, FIG. 5 is a partial sectional view taken along the line AA in FIG. 4, and FIG. 6 shows a state in which a front suspension beam is mounted. It is a schematic side view shown. 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, 17, 20 ... Bolt hole 6, 8, 9 …… Front suspension beam mounting part 7 …… Front frame part 12,22,26 …… Front suspension beam mounting bracket 13,24,28 …… Bottom plate 14 …… Side plate 15 …… Inward convex part 18 …… Bottom plate Flange 19 …… Notch for vehicle body flange 21 …… Bolt 30 …… Front suspension beam

Claims (5)

[Scope of utility model registration request] 1. A front suspension beam 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 formed at two positions, one in front of the other, at the lower end of the front frame. In each of the mounting portions, the outer skin layers are recessed to form a tapered recess having a flat bottom surface and a flared side surface, and the bottom surfaces of the two recesses are joined together. The front suspension beam mounting portion is characterized in that both the recesses to be joined are open to the end portion side of the vehicle body. 2. The front suspension beam mounting portion according to claim 1, wherein among the front suspension beam mounting portions formed at two front and rear locations on the lower end portion of the front frame portion, the rear mounting portion is more than the front mounting portion. The front is characterized in that it is located above, and the recess of the front mounting part is open at the bottom, and the recess of the rear mounting part is open obliquely downward in the front direction of the vehicle body. Suspension beam attachment part. 3. The front suspension beam mounting member fixed to the front suspension beam mounting portion according to claim 1, further comprising a bottom plate and a pair of side plates standing upright from substantially both sides of the bottom plate. The side suspension plate has a pair of inward convex portions that are tapered complementarily to the concave portion of the vehicle body. 4. The structure for mounting a front suspension beam to a front suspension beam mounting portion according to claim 1, further comprising a bottom plate and a pair of side plates standing upright from substantially both sides of the bottom plate, wherein the side plate is provided with A front suspension beam mounting bracket having a pair of inward projections that are complementary to the pair of recesses of the vehicle body is attached to the tapered recess of the vehicle body. A front suspension beam mounting structure for a vehicle body, wherein an inner surface and a surface of a tapered convex portion of the front suspension beam mounting bracket are fixed by an adhesive. 5. The front suspension beam mounting structure according to claim 4, wherein the front suspension beam is fastened to the bottom plate of the metal fitting by bolts, and the bottom plate of the metal fitting is fixed to the rear beam mounting portion. The front suspension beam mounting structure is characterized in that the center axis of the front suspension beam is mounted at a substantially right angle.