JP4742437B2 - Automotive panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automotive panel made of FRP, and more particularly to an automotive panel excellent in both torsional rigidity and bending rigidity.
[0002]
[Prior art]
As various panels of automobiles, FRP panels that are lightweight and have high rigidity and excellent durability and heat insulation are attracting attention. In particular, a sandwich structure panel in which a core material made of foam or the like and FRP skin layers are arranged on both sides thereof has higher rigidity than a panel with an FRP single plate structure, and is excellent in heat insulation and sound insulation.
[0003]
[Problems to be solved by the invention]
However, even when the FRP panel having the sandwich structure as described above is configured, the rigidity may still be insufficient, and higher rigidity is being demanded. In particular, an automotive panel is required to have both excellent torsional rigidity and bending rigidity.
[0004]
Accordingly, an object of the present invention is to provide an FRP automobile panel that can efficiently improve both the torsional rigidity and the bending rigidity of the entire panel while ensuring lightness so as to satisfy the above-described demand. is there.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, an automotive panel according to the present invention has a sandwich structure including a core material and FRP skin layers provided on both sides thereof, and at least one FRP skin layer is in a ± 45 ° direction. a panel material comprising reinforcing fibers arranged reinforcing fiber base, Ri Do and a stiffener of FRP single plate structure is joined to the panel material extends along the periphery of the panel material, said stiffener, said The rigidity is increased only at a specific portion of the peripheral portion of the panel material, and the rigidity of the specific portion of the stiffener is increased by increasing the number of laminated reinforcing fiber substrates . The automotive panel according to the present invention has a sandwich structure including a core material and FRP skin layers provided on both sides thereof, and at least one of the FRP skin layers is provided with reinforcing fibers in the ± 45 ° direction. A panel material comprising a reinforcing fiber base and a stiffener having an FRP single plate structure joined to the panel material and extending along the peripheral edge of the panel material, the stiffener being specified at the peripheral edge of the panel material Only the part is increased in rigidity, and the rigidity of the specific part of the stiffener is increased by increasing the thickness of the reinforcing fiber base.
[0006]
In this automotive panel, it is preferable that the stiffener extends over the entire periphery of the panel member in a hollow state. However, if there is a part where it is difficult to place the stiffener, the stiffener can be partially interrupted at that part, or the stiffener can be extended around the part. Is possible.
[0007]
Further, the stiffener is rigid only the specific portion in the peripheral portion of the panel material that is increased. For example, when the rigidity of a specific direction and a specific part as a whole panel is insufficient, by increasing the rigidity of the stiffener of a specific part that can compensate for the shortage, that is, by giving an appropriate rigidity distribution to the stiffener, It becomes possible to compensate for the lack of rigidity of the entire panel. In addition, the rigidity increase of the specific part of the stiffener in the present invention is not only in the case of increasing the rigidity compared to the part other than the specific part, but also by comparing the rigidity of the specific part with other parts. When intentionally increasing, for example, the width of the stiffener must be made relatively large for connection with other members or mounting of other members, and therefore, the shape of the stiffener at a specific portion must be made to be a low rigidity shape. In such a case, the case where the rigidity of the specific part is intentionally increased by design is included.
[0008]
As a method for increasing the rigidity of a specific part of the stiffener , the present invention employs a method for increasing the number of laminated reinforcing fiber substrates constituting the FRP or a method for increasing the thickness of the reinforcing fiber substrate itself .
[0009]
The stiffener as described above can be formed, for example, in a cross-sectional hat shape, and can be used as a mounting portion for other members in addition to the rigidity improving function that is the original function of the stiffener. It is preferable that the attachment part of the other member is the above-described specific part and the rigidity is particularly increased. And it is preferable to provide the attachment parts on a vehicle body in such a specific part with high rigidity.
[0010]
Such an FRP automobile panel according to the present invention can be applied to various automobile panels. For example, it can be applied to panels for hoods (hoods), roofs, fenders, trunk lids, doors, and bumpers. Among these, the FRP automobile panel according to the present invention is particularly suitable for a bonnet because the rigidity can be improved efficiently.
[0011]
When the automotive panel according to the present invention is applied to a bonnet, it is preferable that the stiffness of the stiffener located in at least one of the front portion and the rear portion of the bonnet is higher than the stiffness of the stiffener located in the side portion. .
[0012]
In such an automobile panel according to the present invention, since the panel material having a sandwich structure includes the reinforcing fiber base material in the ± 45 ° direction, particularly high torsional rigidity is ensured. At this time, if the panel material has a curved shape, higher torsional rigidity is ensured. However, the reinforcing fiber base material in the ± 45 ° direction has a low contribution to the improvement of the bending rigidity of the entire panel. Therefore, the bending rigidity of the entire panel is achieved by the FRP single plate structure stiffener extending along the peripheral edge of the panel material. Is efficiently increased. Since the stiffener has an FRP single plate structure and is disposed only in the peripheral portion in a hollowed state with respect to the panel material, the lightness of the entire automobile panel is also ensured. As a result, according to the FRP automobile panel according to the present invention, both the torsional rigidity and the bending rigidity are efficiently increased while ensuring the original lightness of the FRP member.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an automotive panel according to an embodiment of the present invention, and particularly shows a case where the present invention is applied to a bonnet. In FIG. 1, reference numeral 1 denotes an entire bonnet as an FRP automobile panel. The bonnet 1 includes a panel material 2 and a stiffener 3 joined to the panel material 2 and extending along the peripheral edge of the panel material 2 over the entire circumference. The panel material 2 has a sandwich structure including a core material 4 made of polyurethane foam or the like and FRP skin layers 5a and 5b provided on both sides thereof, as shown in a cross-sectional structure in FIG. At least one of the FRP skin layers 5a and 5b, preferably both, includes a reinforcing fiber base 6 in which reinforcing fibers are arranged in the direction of ± 45 °, and is molded in a form impregnated with a matrix resin. Yes. And as the whole bonnet 1, the center part is formed in the curved shape which swelled upwards of FIG.
[0014]
As shown in FIG. 3, the stiffener 3 has a transverse cross section formed in a hat shape over the entire length, and has an FRP single plate structure. The rigidity of the specific part in the peripheral part of the panel material 2 of the stiffener 3 is increased more than the rigidity of another part. In the present embodiment, the rigidity of the stiffener 3 located at the front part 8 (shaded area) of the bonnet having the striker attaching part 7 and the rear part 10 (hatched area) of the bonnet having the hinge attaching part 9 for opening and closing the bonnet. The stiffness of the stiffener 3 positioned is higher than the stiffness of the stiffener 3 positioned on the side portion 11.
[0015]
The increase in the rigidity is performed by increasing the number of laminated FRP reinforcing fiber bases constituting the stiffener 3. For example, when the reinforcing fiber base material is laminated in the form of a biaxial woven fabric, the reinforcing fiber base material of the stiffener 3 in the side portion 11 is (0 ° / 90 °) layer / (± 45 °) layer × 2 sheets / (0 The four-ply configuration of the (° / 90 °) layer, and the reinforcing fiber base material of the stiffener 3 in the front portion 8 and the rear portion 10 is (0 ° / 90 °) layer / (± 45 °) layer / (0 ° / 90 °) layer / (0 ° / 90 °) layer / (± 45 °) layer × / (0 ° / 90 °) layer 6-ply configuration increases the rigidity of the front part 8 and the rear part 10 . Thus, it is preferable to arrange each layer symmetrically in the stacking direction.
[0016]
In the bonnet 1 as the FRP automobile panel configured as described above, the panel material 2 includes the reinforcing fiber base layer of ± 45 °, so that the panel material 2 as a whole, and thus the bonnet 1 as a whole, High torsional rigidity is ensured. Further, since the panel material 2 has a curved shape with the center portion swelled, this curved shape also contributes to an improvement in torsional rigidity.
[0017]
A stiffener 3 extending along the peripheral edge is joined to the panel material 2. Since the stiffener 3 is formed in a hat shape in cross section, the stiffener 3 has high bending rigidity. By joining the stiffener 3, high bending rigidity of the bonnet 1 as a whole is ensured. That is, since the stiffener 3 is formed in a hollow frame shape, the stiffener 3 itself cannot exhibit a large torsional rigidity, but has a high bending rigidity, so that the panel member 2 has a bending rigidity that is insufficient. Can be supplemented. As for the torsional rigidity, high torsional rigidity is ensured by the ± 45 ° arrangement of the reinforcing fiber bases in the panel material 2 as described above. Accordingly, both the high torsional rigidity and the high bending rigidity are ensured for the bonnet 1 as a whole. Further, since the stiffener 3 has a hollow frame shape, even if the stiffener 3 having the FRP single plate structure is added to the panel material 2, the weight of the bonnet 1 as a whole does not increase so much, and desirable light weight is ensured. .
[0018]
And in the said bonnet 1, since the front part 8 and the rear part 10 have the striker attachment part 7 and the hinge attachment part 9, the width | variety of the hat shape of the stiffener 3 may have to be enlarged, for that purpose There is a possibility that the stiffness of the stiffener 3 is lower than that of the side portion 11 at those portions 8 and 10. However, in the above embodiment, the rigidity is increased by increasing the number of plies of the reinforcing fiber base at these specific portions 8 and 10, and the stiffener 3 is provided with an appropriate rigidity distribution along the extending direction. Therefore, the above-described tendency of lowering the rigidity is suppressed, and the bending rigidity having a good balance as a whole can be efficiently obtained. As a result, partial rigidity deficiency is compensated, and high bending rigidity can be obtained in a well-balanced manner as the bonnet 1 as a whole.
[0019]
The part where the rigidity of the stiffener should be increased may be determined according to the type of the panel for an automobile when the panel for an automobile to which the present invention is applied is another panel. What is necessary is just to determine according to the connection with another member.
[0020]
【The invention's effect】
As described above, according to the automotive panel of the present invention, it is possible to efficiently improve both the torsional rigidity and the bending rigidity of the entire panel while ensuring the lightness, heat insulation, sound insulation, etc. as the FRP panel. It is possible to provide excellent automotive panels that satisfy various requirements.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a vehicle panel according to an embodiment of the present invention.
2 is an enlarged partial cross-sectional view of a panel material of the automobile panel of FIG. 1. FIG.
FIG. 3 is an enlarged cross-sectional view of a stiffener along the line III-III in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bonnet as a panel for vehicles 2 Panel material 3 Stiffener 4 Core material 5a, 5b FRP skin layer 6 Reinforcement fiber base material 7 Striker attachment part 8 Front part 9 Hinge attachment part 10 Rear part 11 Side part

Claims (7)

A panel material comprising a reinforcing fiber base material having a sandwich structure including a core material and FRP skin layers provided on both sides thereof, wherein at least one FRP skin layer has reinforcing fibers arranged in ± 45 ° directions; , Ri Do and a stiffener of FRP single plate structure is joined to the panel material extends along the periphery of the panel material, the stiffener is rigid only the specific portion in the peripheral portion of the panel material are increased, the stiffener The panel for an automobile is characterized in that the rigidity of the specific part is increased by increasing the number of laminated reinforcing fiber substrates . A panel material comprising a reinforcing fiber base material having a sandwich structure including a core material and FRP skin layers provided on both sides thereof, wherein at least one FRP skin layer has reinforcing fibers arranged in ± 45 ° directions; And a stiffener having an FRP single plate structure that is joined to the panel material and extends along the peripheral edge of the panel material. An automotive panel characterized in that the rigidity of a specific portion is increased by increasing the thickness of a reinforcing fiber substrate. The stiffener extends over the entire periphery of the panel material, according to claim 1 or 2 automotive panels. The automotive panel according to any one of claims 1 to 3 , wherein the stiffener is formed in a hat shape in cross section. The hood is a mounting portion of the other member, automotive panel according to claim 1. The automotive panel according to any one of claims 1 to 5 , which is a bonnet. The automotive panel according to claim 6 , wherein the stiffness of the stiffener located in at least one of the front portion and the rear portion of the bonnet is higher than the stiffness of the stiffener located in the side portion.

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