JPH0144548B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a technology for reducing the weight of a hood provided in an engine room or trunk room of an automobile.

(Prior art) As a conventional automobile hood, for example,
The one described in Japanese Patent No. 60-219165 is known.

As a means to reduce the weight of automobiles, this conventional product is made of a plastic plate instead of a steel plate for an automobile hood whose overall shape is approximately rectangular. a peripheral rib along the plastic plate, a striker attachment part which is one part of the locking device formed at the center of one edge of the plastic plate, and a hinge attachment part formed at both ends of the other edge opposite to said one edge. It had a structure in which a V-shaped rib was integrally molded and protruded along the line connecting the two.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional product, as shown in FIG.
02 is integrally molded so that the plastic plate 10 is formed in the rib 102 portion during molding.
There is a risk that dents (sink marks) 104 may occur on the surface of the 0. If this occurs, it will be necessary to apply putty or the like during surface finishing to repair this. If the width is made narrower, the number of ribs must be increased in order to obtain sufficient reinforcing strength, which causes the problem that it becomes difficult to cut out the mold during molding.

In addition, when using a plastic plate formed by injection molding, etc., when forming the plastic plate,
As shown in FIG. 5, a problem arises in that voids 106 are formed and grow due to heating during coating on the plastic board, resulting in raised portions 110 on the surface of the plastic board 108.

Furthermore, a plastic board alone does not have the effect of shielding radio waves, so if a conventional product is used as a hood for the engine room, the noise radio waves emitted from the engine will pass through the hood and leak out of the car, causing radio waves in the car and radio waves to leak out. There was also a problem with inputting data into a computer and causing radio interference.

As mentioned above, conventional products have poor surface quality during molding, requiring extensive post-processing measures to reinforce this, and countermeasures against radio wave interference, such as pasting a thin aluminum plate on the back surface, are required. This system had many problems, such as the need to prepare a separate system.

(Means for Solving the Problems) The present invention has been made in order to solve the above-mentioned conventional problems, and for this purpose, the automobile hood of the present invention has a substantially rectangular overall shape. , the center of one edge is the locking device attachment part,
In the automobile hood in which both ends of the other edge opposite to the one edge are hinge attachment parts, an outer plate member forming the overall shape of the hood is formed of an aluminum plate, and the hood is attached to the inner surface of the outer plate member. an inner plate member integrally formed with a peripheral edge reinforcing portion along the entire periphery of the lock device and a V-shaped reinforcing portion along a line connecting the lock device attachment portion and the hinge attachment portion;
The inner plate member is formed by surrounding a honeycomb core filled with foam with plastic,
and a tensile rigidity retaining member is formed on the inner surface of the outer plate member between the peripheral edge reinforcing portion and the V-shaped reinforcing portion of the inner plate member, and the tension rigidity retaining member is formed between the outer plate member and the inner surface of the outer plate member. The structure was formed by filling foam between plastic plates that were glued together.

(Function) In the automobile hood of the present invention, an inner plate member having a honeycomb core surrounded by a plastic face member is polymerized and bonded to the inner surface of an outer plate member made of an aluminum plate, and a plate member having a tension rigidity retaining member is formed. It becomes a structure.

Therefore, the aluminum plate that will become the outer plate member is simply press-molded into a predetermined shape.

Further, since the aluminum plate serving as the outer plate member maintains its surface quality by itself, this aluminum plate maintains this surface quality as the skin of the hood.

Aluminum plates have a radio wave shielding effect, so when used as a hood for an engine room, they block noise and radio waves from the engine.

In addition, since the aluminum plate forming the outer plate member, the honeycomb core and plastic forming the inner plate member, and the plastic plate and foam forming the tension rigidity retaining member are each lightweight, the entire hood The quantity becomes lighter.

In addition, in terms of strength, the peripheral reinforcement part of the inner plate member and the V
Torsional rigidity and bending rigidity are given to the hood within the necessary minimum range of the character-shaped reinforcing portion, and surface rigidity is given to the hood by the tensile rigidity retaining member for the portion that is not backed up by the inner plate member.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In this embodiment, a hood provided in an engine room is taken as an example of an automobile hood.

The hood 1 of this embodiment has a plate structure mainly comprising an outer plate member 2, an inner plate member 3, and a tension rigidity holding member 4, and has an overall shape of a front edge 11, side edges 12, 12 is formed into a substantially rectangular shape with notched corners, and both sides are slightly curved downward, and in the center of the front edge 11 there is a striker attachment part of a striker which is one part of the locking device for the hood lock. 13 is provided, and hinge mounting portions 15, 15 are provided at both ends of the rear edge portion 14.

The outer plate member 2 is made of an aluminum plate with a thickness of 0.7 mm, and is formed into a substantially rectangular shape so as to form the outer shape of the hood 1, and a downwardly bent portion 21 is formed at the periphery.

The inner plate member 3 is superimposed and bonded to the inner surface of the outer plate member 1, and includes a peripheral edge reinforcement portion 31 along the entire periphery of the hood 1, and the striker attachment portion 13.
and a V-shaped reinforcing part 32 integrally formed with a peripheral reinforcing part 31 along the line connecting the hinge mounting parts 15, 15, and made of fiber reinforced plastic (GFRP) in which glass fiber is impregnated with thermosetting plastic. The paper honeycomb is impregnated with phenolic resin using face materials 33 and 34 with a thickness of 1 mm, and the composite structure surrounds a honeycomb core 36 with a height of 10 mm or less, which is filled with a hard polyurethane highly foamed foam 35 inside the core. It is formed.

In this case, the surface of the face material 33 (hereinafter referred to as the "upper surface material") which will be the adhesive side to the outer plate member 2 is formed flat with no unevenness, and the surface material 34 (hereinafter referred to as the "lower surface material") which will be the inner surface side of the hood 1. A joining flange portion 342 is formed on the side edge of a shallow recessed portion 341 formed at the same depth as the height of the honeycomb core 36.

When molding, an adhesive is interposed between the inner surface of the outer plate member 2 and the upper surface of the upper side member 33, and between the upper surface of the joining flange portion 342 and the lower surface of the upper side member 33, and A foaming stock solution is injected between the material 33 and the lower side material 34, and a honeycomb core 36 is put in and pressurized, and this is placed in an oven and heated.

Therefore, by this forming, the outer plate member 2 and the upper side member 33 are bonded, and at the same time, the upper side member 33 and the lower side member 34 are bonded together at the joining flange portion 342, and at the same time, Double-sided material 3
A honeycomb core 36 is inserted into the closed cross-sectional space formed between 3 and 34, and the inside of the honeycomb core 36 is filled with a foam 35, and the upper and lower surfaces of the honeycomb core 36 are filled with the foam 35. The upper side material 33 and the lower side material 3 are used as adhesives, respectively.
It is glued to 4.

The tension rigidity retaining member 4 is arranged between the peripheral edge reinforcing portion 31 and the V-shaped reinforcing portion 32 of the inner plate member 3, between the V-shaped reinforcing portions 32, 32, and between the front and rear edges of the peripheral edge reinforcing portion 31. They are formed on the inner surface of the outer plate member 2 in a state where they are respectively passed between them.

Further, the tension rigidity holding member 4 is connected to the outer plate member 2.
A foam 42 made of ethylene vinyl acetate copolymer (EVA) is filled between a sheet plate 41 made of epoxy resin and a plastic plate bonded to the inner surface of the outer plate member 2. With the foaming stock solution injected between the member 2 and the sheet plate 41, an adhesive is interposed between both side edges of the sheet plate 41 and the outer plate member 2, and this is placed in an oven and heated.

Therefore, as the foaming stock solution is foamed by this molding, the central portion of the sheet plate 41 is raised by the foam 42, and the outer plate member 2 and the sheet plate 41 are
A foam 42 is filled in a closed cross-sectional space 43 surrounded by.

Next, the operation of this embodiment will be explained.

The hood 1 of this embodiment has an outer plate member 2 made of an aluminum plate, face materials 33 and 34 made of GFRP, and a honeycomb core 36 whose core is filled with a foam 35.
It has a reinforced plate structure with an inner plate member 3 surrounding the inner plate member 3 and a tension rigidity holding member 4 surrounding the foam 42 between the outer plate member 2 and the sheet plate 41. Since it is lightweight, its overall weight is reduced.

In addition, the inner plate member 3, by its peripheral edge reinforcing portion 31 and V-shaped reinforcing portion 32, backs up the outer plate member 2 made of an aluminum plate while attaching a striker to the entire periphery of the hood 1 and the point of force application. The line connecting the portion 13 and the hinge attachment portions 15, 15 will be reinforced, and rather than reinforcing the entire surface of the hood 1, the torsion and bending of the hood 1 will be reinforced to the minimum extent necessary, and partial reinforcement will be used. We aim to reduce the weight by using

Further, the tension rigidity holding member 4 backs up the portion of the outer plate member 2 which cannot be completely backed up by the inner plate member 3 described above, and maintains the surface rigidity of the outer plate member 2.

Further, the aluminum plate forming the outer plate member 2 constitutes the skin of the hood 1, and the surface quality of the hood 1 is maintained by this aluminum plate, and the aluminum plate prevents noise from the engine due to its radio wave shielding effect. It blocks radio waves and prevents them from leaking from the engine room.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration of the present invention is not limited to the above-described embodiments, and the present invention may be modified even if there is a design change within a range that does not depart from the gist of the invention. included.

For example, in the embodiment, a hood for an engine room is used as an example, but the structure of the present invention can also be applied to a hood (lid) for a trunk room, etc.

In addition to glass fiber-reinforced plastic, carbon fiber-reinforced plastic (CFRP) and other chemical fiber-reinforced plastics can be used for the face material of the inner plate member.

Further, an aluminum honeycomb may be used for the honeycomb core of the inner plate member, and the method for forming the inner plate member and the foam to be filled inside the honeycomb core are not limited to those in the embodiments.

Furthermore, the molding method and material of the plastic plate and foam of the tension and rigidity retaining member are not limited to those of the embodiment.

(Effects of the Invention) As explained above, the automobile hood of the present invention includes an outer plate member made of an aluminum plate, an inner plate member having a honeycomb core surrounded by a face material made of plastic, and an outer plate member. Since the plate structure consists of a tension rigidity retaining member filled with foam between the plastic plate, the hood can be reinforced to the minimum necessary extent while achieving a reduction in overall weight. Further weight reduction can be achieved through limited partial reinforcement.

In addition, since the outer plate member, which is the skin of the hood, is made of aluminum plate, the surface quality can be maintained by itself, and there is no need to repair the surface in post-processing as in the past. Since noise radio waves from the engine can be shielded, there is no need to separately take countermeasures against radio wave interference.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a hood according to an embodiment of the present invention seen from the inside, FIG. 2 is a sectional view of FIG. 1,
FIG. 3 is a sectional view of FIG. 1, and FIGS. 4 and 5 are explanatory diagrams of the prior art. 1: Hood, 2: Outer plate member, 3: Inner plate member, 4: Tension rigidity holding member, 11: Front edge (one edge), 13: Striker attachment part (lock device attachment part), 14: Rear edge part (other edge part), 15: hinge attachment part, 31: peripheral edge reinforcement part, 32: V-shaped reinforcement part, 33: face material, 34: face material, 35: foam,
36: Honeycomb core, 41: Sheet plate (plastic), 42: Foam.

Claims (1)

[Scope of Claims] 1. An automobile whose overall shape is substantially rectangular, with the center of one edge serving as a lock device attachment part, and both ends of the other edge opposite to said one edge serving as hinge attachment parts. In this hood, an outer plate member forming the overall shape of the hood is formed of an aluminum plate, and an inner surface of the outer plate member is provided with a peripheral reinforcing portion along the entire periphery of the hood, and connecting the locking device attachment portion and the hinge attachment portion. An inner plate member integrally formed with a V-shaped reinforcing portion along the line is polymerized and bonded, and the inner plate member is formed by surrounding a honeycomb core filled with foam inside with a plastic face material. , and a tension rigidity retaining member is formed on the inner surface of the outer plate member between the peripheral edge reinforcing portion and the V-shaped reinforcement portion of the inner plate member, and the tension rigidity retaining member is formed between the outer plate member and the outer plate member. An automobile hood characterized by being formed by filling a foam between plastic plates bonded to the inner surface.