JP4109487B2 - Fiber reinforced plastic parts - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fiber reinforced plastic (FRP) component used in automobiles and the like.
[0002]
[Prior art]
As a hood (bonnet) used for an automobile, a metal hood is often used. The metal hood protects passengers and pedestrians by controlling the deformation and breaking behavior of parts during a collision. In other words, assuming a collision, a “folded bead” that is a fragile part of the hood is formed in advance, and the hood is designed to be deformed into a predetermined shape starting from the folded bead at the time of the collision.
[0003]
In recent years, fiber-reinforced plastics (hereinafter referred to as FRP), particularly carbon fiber plastics, have been used as members constituting automobiles in order to reduce vehicle weight. FRP has a mechanical strength equal to or higher than that of metal and is lighter than metal, and thus has been used for members such as automobile exteriors. The hood is no exception, and in the aftermarket market, an FRP hood for retrofitting is used on the market.
[0004]
[Problems to be solved by the invention]
By the way, the FRP hood has a feature that FRP has excellent spring characteristics and is not plastically deformed, so that it is less likely to be deformed than a metal hood. For this reason, an unbalance or mismatch in deformation occurs in which the FRP hood does not deform even if the metal vehicle body is largely deformed at the time of a vehicle collision.
[0005]
In order to solve this problem, a method of forming a bead of the same degree as that of a metal hood on the FRP hood and using it as a deformation starting point at the time of collision is also conceivable. Because the characteristic wins and the hood does not deform sufficiently, it is excessive due to the collision with the hinge that engages the hood with the hood at the rear end of the hood and the striker that engages the hood with the hood at the front end of the hood. It became clear that another problem occurred under load and damage to these parts.
[0006]
If the mechanical strength of the FRP hood is reduced by increasing the notch of the folded bead, it is possible to deform the FRP hood at a desired location at the time of a collision. It will no longer meet its own mechanical strength. In addition, in this case, since the trace of the fold bead provided on the back surface of the hood is viewed from the hood surface, it is not preferable in terms of vehicle design.
[0007]
The same applies to the case where the thickness of the FRP hood is reduced, and the mechanical strength of the hood itself in a normal use state is not satisfied.
[0008]
The present invention has been made in view of such problems, and it is an object of the present invention to provide an FRP component that has sufficient strength in a normal use state and deforms at a desired location without breaking at the time of a collision. .
[0009]
[Means for Solving the Problems]
The present invention is configured as follows to solve the above-described problems.
The invention according to claim 1 is a fiber reinforced plastic part formed by laminating a plurality of layers of fiber reinforced plastic material.
At least one layer of said plurality layer is, with has a cutting layer containing the cut line to the fibers of the fiber-reinforced plastic material, the cutting line is placed in a position intended for deformation of the fiber-reinforced plastic component itself The cutting layer is a fiber reinforced plastic part characterized in that it is provided below the surface layer constituting the appearance of the fiber reinforced plastic part.
[0010]
According to the first aspect of the present invention, in a fiber reinforced plastic part in which a plurality of layers of fiber reinforced plastic material are laminated, at least one layer of the plurality of layers of fiber reinforced plastic material is cut in advance along a cutting line. A cutting layer was obtained.
Thereby, since the continuity of the fiber in the fiber reinforced plastic material of the cutting layer is lost in the cutting line, the cutting line of the fiber reinforced plastic part becomes a portion having a low mechanical strength.
Therefore, when a large external force is applied to the fiber reinforced plastic part, the fiber reinforced plastic part can be deformed starting from the cutting line.
Note that the cutting line is not limited to a solid line, and includes a dotted line, a broken line, a wavy line, and the like. Not limited.
[0011]
In addition, since the fiber reinforced plastic parts other than the cutting line are laminated with multiple layers of fiber reinforced plastic materials, sufficient mechanical strength is ensured under normal use conditions (when no large external force is applied). Can keep.
In addition, as a fiber reinforced plastic material, the thing of cloth shape or a sheet shape is suitable.
[0013]
According to the first aspect of the present invention, since the cutting layer is provided below the surface layer constituting the appearance of the fiber reinforced plastic part, a cutting line that impairs the appearance is not visually observed. The design of the parts is not impaired.
[0014]
The invention according to claim 2, said plurality of layers, a fiber-reinforced plastic component according to claim 1, characterized in that a breaking-preventing layer for preventing breakage of the fiber-reinforced plastic parts.
[0015]
According to the second aspect of the present invention, since the fiber reinforced plastic part formed by laminating a plurality of layers of the fiber reinforced plastic material is provided with the breakage preventing layer, the fiber reinforced plastic part follows the cutting line. Even if it eventually deforms and eventually breaks, the fragments are secured by the breakage preventing layer and do not scatter around.
[0016]
According to a third aspect of the present invention, the fiber-reinforced plastic part is a hood for an automobile, and has a cutting layer in which the cutting lines are inserted at a front portion and a rear portion of the hood. Or it is the fiber reinforced plastic part of Claim 2 .
[0017]
According to the invention described in claim 3 , since the fiber reinforced plastic part is used as a hood for automobiles, when a large external force is applied to the hood such as a frontal collision, the hood is taken along a predetermined cutting line. Therefore, it is possible to reduce an excessive load applied to the hinge and striker, which has been a problem in the past.
Moreover, if a cutting layer is provided in a lower layer than the surface layer (surface visible from the outside) which comprises the external appearance of a hood, a cutting line will not be visually observed and the beauty | look of a hood will not be impaired.
Furthermore, if a breakage prevention layer is provided adjacent to the cut layer, even if the hood breaks, the fragments do not scatter around.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a perspective view of an automobile hood as an example of the fiber-reinforced plastic part of the present invention, and FIG. 2 is a drawing showing a laminated structure of the hood.
[0019]
Fig.1 (a) is the perspective view which looked at the hood for motor vehicles from the surface side. FIG.1 (b) is the perspective view which looked at the hood for motor vehicles from the back side. The hood for automobiles is a member that covers the engine room when the engine is mounted on the front side of the vehicle and covers the front trunk when the engine is mounted on the rear side of the vehicle.
[0020]
As is clear from FIGS. 1A and 1B, the hood 1 is composed of a skin 1a integrally formed in a smooth curved surface, and a frame 1b that supports the skin 1a from the back surface. In the present embodiment, both skin 1a and frame 1b are assumed to be formed of FRP.
[0021]
The hood 1 is a member that is mounted on the front side of the vehicle as described above, and is a member that comes into contact with an object to be collided when the vehicle collides forward. In order to control the degree of breakage after the collision, it is preferable that the degree of breakage between the conventional metal hood and the FRP hood 1 be approximately the same in dimension.
[0022]
As one of them, a fragile portion is formed in the hood 1 in advance to control deformation and breaking behavior of the hood 1 at the time of collision.
[0023]
In the hood 1 of the present embodiment, there is no need to consider the design of the vehicle for the frame 1b that cannot be seen from the outside of the automobile, so that a bent bead (not shown) similar to the conventional one is formed. Sometimes the frame 1b can be deformed starting from this fold bead.
[0024]
However, the skin 1a is a member constituting the appearance of the vehicle and can be visually observed from the outside of the automobile. Therefore, it is not possible to provide a fold bead for the reason described in the section of the prior art. Is possible.
[0025]
Therefore, in the present invention, by providing a cutting line (details will be described later) obtained by cutting the fibers of the FRP film as shown in FIG. 2 inside the skin 1a configured by laminating the FRP films. A fragile portion was introduced into the skin 1a, and at the time of collision, the skin could be deformed starting from this cutting line.
[0026]
In FIG. 1, the dotted lines indicate cutting lines 2a, 2b, 2c introduced into the skin 1a. Three first cutting lines 2a are provided in parallel across the hood 1 in the vehicle width direction in front of the hood 1 (slightly behind the striker ST). Thereby, when the automobile collides with the front, the skin 1a is deformed starting from the first cutting line 2a. Three each of the second and third cutting lines 2b and 2c are provided so as to cross both corners at the rear of the hood 1 where the hinge connecting the hood 1 and the vehicle body exists. Thereby, when the automobile collides with the front, the skin 1a is deformed starting from the second and third cutting lines 2b and 2c, so that an excessive load is not applied to the hinge. In addition, the part which put the cutting lines 2a, 2b, and 2c is a location which intends a deformation | transformation.
[0027]
The reason why the first, second and third cutting lines 2a, 2b and 2c are three is to stabilize the deformation behavior of the skin 1a at the time of collision. However, the cutting lines 2a, 2b, 2c are not limited to three as long as they exhibit stable deformation behavior at the time of collision and have sufficient strength during normal use.
[0028]
Next, the cross-sectional structure of the skin 1a will be described with reference to FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG.
The skin 1a is formed by laminating a plurality of FRPs. A carbon fiber reinforced plastic material 3a (hereinafter referred to as a CFRP film) is first laminated from the back side, and a CFRP film 3b (cutting layer 3b) in which a cutting line 2a is put on the carbon fiber is laminated thereon. The aramid fiber reinforced plastic material 3c (breakage prevention layer 3c) is laminated on the two layers thereon, and the CFRP film 3d serving as the surface of the skin 1a is laminated on the two layers. ing.
[0029]
In the cutting layer 3b, as is clear from FIG. 2, the fiber of the carbon fiber reinforced plastic material is cut by the cutting line 2a, the continuity of the fiber is lost, and it is a mechanically fragile place, In the event of a collision, the skin 1a can be deformed starting from the cutting line 2a.
[0030]
The skin 1a is formed by laminating a sheet-like prepreg on a mold and heat-curing with an autoclave or the like, but the cutting layer 3b is laminated after cutting the prepreg along the cutting line 2a. Formed with.
[0031]
Moreover, since the CFRP film 3d used as the surface of the skin 1a is laminated | stacked on the cutting layer 3b, since the cutting layer 3b is not visually observed from the outside, the design property of the skin 1a is kept favorable. .
[0032]
The anti-breaking layer 3c is laminated adjacent to the cutting layer 3b. When an excessive load is applied at the time of collision and the skin 1a is not deformed enough, the skin 1a completely breaks and breaks into pieces. It is a member having a role of preventing (part separation). Therefore, an aramid fiber that is very difficult to break is disposed in the breakage prevention layer 3c. In the present embodiment, the fracture preventing layer 3c is provided on the entire surface of the skin 1a.
The cross-sectional structure of the skin 1a at the second and third cutting lines 2b and 2c is the same as this.
[0033]
As mentioned above, although embodiment of this invention was described, the application of the fiber reinforced plastic part of this invention is not restricted only to the hood for motor vehicles, When a predetermined load is added, it is various fiber reinforcement requested | required to deform | transform. It can be applied to plastic parts.
[0034]
The present invention is not limited to this embodiment, and various modifications that embody the technical idea of the present invention are possible.
[0035]
【The invention's effect】
The present invention has the following remarkable effects.
Since the fiber-reinforced plastic part of the present invention has a cutting layer in which a cutting line is formed in the fiber, it can be deformed starting from the cutting line when a large external force such as a collision is applied. . In addition, since the fiber reinforced plastic parts other than the cutting line are laminated with multiple layers of fiber reinforced plastic materials, sufficient mechanical strength is ensured under normal use conditions (when no large external force is applied). (Claim 1).
[0036]
In the fiber reinforced plastic part of the present invention, the cutting layer is provided below the surface layer constituting the appearance of the part. Therefore, the cutting layer is not visually recognized from the outside, and the appearance of the fiber reinforced plastic part is impaired. (Claim 2).
[0037]
In the fiber reinforced plastic part of the present invention, since a breakage prevention layer is provided in the fiber reinforced plastic part formed by laminating a plurality of layers of fiber reinforced plastic material, the load applied to the fiber reinforced plastic part becomes excessive, Even if the part is broken and separated into pieces, the breakage preventing layer can prevent complete breakage (separation) of the part (claim 3).
[0038]
Since the fiber-reinforced plastic part of the present invention is used as a hood for an automobile, the weight can be reduced as compared with a conventional metal hood. Further, when a large external force is applied due to a collision or the like, the hood can be deformed along the cutting line. Even if the hood breaks, the breakage preventing layer is present, so that the part is not completely broken. Furthermore, since the cutting layer is provided inside the hood and cannot be seen from the outside, the aesthetic appearance of the hood is not impaired (claim 4).
[Brief description of the drawings]
FIG. 1 (a) is a perspective view of an automobile hood as seen from the front side, and FIG. 1 (b) is a perspective view of the automobile hood as seen from the back side.
FIG. 2 is a drawing showing a laminated structure of a hood.
[Explanation of symbols]
1 Hood 1a Skin 1b Frame 2a, 2b, 2c Cutting line 3a, 3d CFRP film 3b Cutting layer 3c Breakage prevention layer

Claims (3)

In fiber reinforced plastic parts formed by laminating multiple layers of fiber reinforced plastic materials,
At least one layer of said plurality layer is, with has a cutting layer containing the cut line to the fibers of the fiber-reinforced plastic material, the cutting line is placed in a position intended for deformation of the fiber-reinforced plastic component itself The fiber-reinforced plastic part is characterized in that the cutting layer is provided below the surface layer constituting the appearance of the fiber-reinforced plastic part. Wherein the plurality of layers, the fiber-reinforced plastic component according to claim 1, characterized in that a breaking-preventing layer for preventing breakage of the fiber-reinforced plastic parts. The fiber reinforced plastic part according to claim 1 or 2 , wherein the fiber reinforced plastic part is a hood for an automobile, and has a cutting layer in which the cutting line is inserted at a front part and a rear part of the hood. Plastic parts.

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