JP2008037294A - Fiber-reinforced plastic automobile hood panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber-reinforced plastic automobile hood panel capable of securely achieving desirable impact energy absorption caused by V-shaped bending deformation at the time of a collision accident. <P>SOLUTION: In this fiber-reinforced plastic automobile hood panel, to a fiber-reinforced plastic outer 2 forming an outer surface, a fiber-reinforced plastic inner 3 for reinforcing the outer 2 is jointed. The inner 3 has a front reinforcement part 4 extending in the width direction in a vehicle body front part, a rear reinforcement part 5 extending in the width direction in a vehicle body rear part and side reinforcement parts 6 connecting the front reinforcement part 4 to the rear reinforcement part 5 so as to surround the outer periphery along the peripheral edge part of the outer 2. In portions on the side reinforcement parts 6 positioned within a range of 40 to 60% of a length from the front end of the front reinforcement part 4 and the rear end of the rear reinforcement part 5, inner bending introduction parts 9 with lower rigidity and/or lower strength than those of other portions are formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an automotive hood panel made of fiber reinforced plastic, and more particularly to a technique for effectively absorbing impact loads and protecting passengers and pedestrians from impacts.

  In recent years, fiber reinforced plastic hood panels have been actively developed instead of metal hood panels. This is because the specific rigidity and non-strength of the fiber reinforced plastic are larger than those of other materials such as metal, and thus a lightweight and high rigidity / high strength product can be obtained. For this reason, the hood panel made of fiber reinforced plastic is not a complicated structure like a metal hood panel (for example, Patent Document 1), but extends over the outer periphery made of fiber reinforced plastic that forms the outer surface and the peripheral edge thereof. Most of them have a simple shape in which a frame-shaped fiber-reinforced plastic inner is joined (for example, Patent Document 2), and it is considered that the application will be further expanded in view of the ease of structural design.

  On the other hand, automobiles are required to improve safety in the event of a collision, and in particular, in order to ensure the safety of passengers and pedestrians when shocking external forces are applied, the front part of the vehicle such as a hood panel These structural members are required to have a structure that absorbs energy by being appropriately deformed.

  In particular, in a hood panel, the energy is absorbed by the hood panel being bent into a "<" shape from the vicinity of the center of the hood panel at the time of a collision. In the conventional metal hood panel, this fold is the starting point. The bending introduction part is designed to match a complicated hood structure and is formed in a complicated manner (for example, Patent Document 3).

  Also in the fiber reinforced plastic hood panel, it is essential to ensure safety, and from this point of view, there is a demand for a bending introduction portion that is a starting point that bends into a “<” shape at the time of collision. The fiber reinforced plastic hood panel has a simple shape as described above, and the load path is clear, so it does not seem to be necessary to design a complicated bending introduction part like a metal hood panel. In the vehicle body front-rear direction, the one formed approximately in the vicinity of the center is disclosed (for example, Patent Document 4). However, since the fiber reinforced plastic material is a material that has a higher specific rigidity / non-strength than the metal described above and does not undergo plastic deformation, the fiber reinforced plastic hood panel is a metal hood. Compared to panels, it is harder to deform, and when it is further deformed, it breaks down.

  In a fiber reinforced plastic hood panel, in order to demonstrate the energy absorption performance at the time of collision, if the mechanical rigidity of the bending introduction part is lowered, it becomes possible to greatly deform and absorb energy at the time of collision, but if it exceeds the limit, it is normal In some cases, the mechanical rigidity of the hood panel itself may not be satisfied.

  Furthermore, if the design of the bending introduction part at the time of collision is wrong and the mechanical strength is lowered too much, the deformation progresses and breaks down. In this case, there is a possibility that one member of the broken hood panel may damage a vehicle body part behind the hood panel such as a windshield.

  As a technique for preventing breakage, a technique of laminating a breakage prevention layer in a fiber reinforced plastic at a location to be broken has been studied (for example, Patent Document 5), but this method introduces an extra layer not related to mechanical performance. Therefore, there is a problem that there is no merit for weight reduction, which is a major feature of the fiber reinforced plastic food panel.

  On the contrary, if the mechanical rigidity and strength are designed too high in order to avoid breakage, the deformation of the fiber reinforced plastic hood panel is small even if the metal vehicle body is plastically deformed and greatly deformed at the time of collision. In this case, because the hood panel does not deform sufficiently, the hinge that connects the hood panel to the vehicle body at the end of the hood panel due to this, or the striker that connects the hood panel at the front end to the vehicle body There is a possibility that an excessive load will be applied to these parts and the other parts will be damaged.

In this way, in contrast to the ease of structural design, for the design at the time of collision, rigidity design and strength design such as bending the hood panel to absorb the energy by bending it to the shape of a `` U '' is possible. It is necessary to carry out a rigorous combination of designs, spending an enormous amount of time on the design, and also considering whether or not it is broken, so the difficulty is extremely high compared to the design of metal hood panels was there.
JP 2001-233248 A JP 2002-284038 A JP-A-2005-239092 JP 2005-125883 A JP2003-31856

  The present invention solves the above-mentioned potential problems of the prior art, and even in a fiber reinforced plastic automobile hood panel, the required performance in the event of a collision accident, in particular, a "<"-shaped bent deformation It is an object of the present invention to provide an automobile food panel made of fiber reinforced plastic that can surely achieve the desired impact energy absorption.

  In order to achieve the above object, a hood panel for automobiles made of fiber-reinforced plastic according to the present invention has the following configuration.

That is,
(1) A fiber reinforced plastic automobile hood panel in which a fiber reinforced plastic inner for reinforcing the outer is joined to a fiber reinforced plastic outer for forming an outer surface, wherein the inner is a peripheral portion of the outer A front reinforcing portion extending in the width direction at the front portion of the vehicle body, a rear reinforcing portion extending in the width direction at the rear portion of the vehicle body, and a side reinforcing portion connecting the front reinforcing portion and the rear reinforcing portion so as to surround the outer periphery along With respect to the front-rear direction of the vehicle body at a location on the side reinforcing portion located in a range of 40% to 60% of the length from the front end of the front reinforcing portion to the rear end of the rear reinforcing portion. An automotive hood panel made of fiber-reinforced plastic, characterized in that an inner bend introduction portion that extends obliquely and has lower rigidity and / or strength than other portions before and after.

  (2) The fiber reinforced plastic automobile food panel according to (1), wherein the inner bend introduction portion extends obliquely at an angle in a range of 30 ° to 60 ° from the direction toward the front of the vehicle body to the vehicle body inside.

  (3) The fiber reinforced plastic automobile food panel according to (1) or (2), wherein the inner bending introduction portion is formed by partially reducing a thickness of the fiber reinforced plastic inner.

  (4) The inner bend introducing portion includes a plurality of reinforcing fiber layers, and the inner bend introducing portion is formed by partially changing a laminated structure of the reinforcing fiber layers constituting the fiber reinforced plastic inner. The fiber reinforced plastic automobile food panel according to any one of (1) to (3).

  (5) The fiber reinforcement according to any one of (1) to (4), wherein the inner bend introduction portion is formed by partially reducing the amount of reinforcing fibers constituting the fiber-reinforced plastic inner. Plastic automotive food panel.

  (6) The inner bending introduction portion is formed by disposing discontinuous portions of the reinforcing fibers by cutting a part of the reinforcing fibers constituting the fiber-reinforced plastic inner. (5) The food panel for automobiles according to any one of (5).

  (7) Said (1)-(6) in which said inner bending introduction part is formed by arrange | positioning the dissimilar reinforcing fiber with low rigidity and / or intensity | strength compared with the other part of the said fiber reinforced plastic inner parts. A food panel for automobiles made of fiber-reinforced plastic according to any one of the above.

  (8) The hood panel for automobiles made of fiber reinforced plastic according to any one of (1) to (7), wherein the outer has a sandwich structure in which a core material is interposed between skin plates of fiber reinforced plastic.

  (9) The automobile food panel made of fiber-reinforced plastic according to any one of (1) to (8), wherein the reinforcing fiber is carbon fiber.

  According to the present invention, it is possible to reduce the design difficulty at the time of a collision even in a fiber reinforced plastic automobile hood panel having a high degree of design difficulty at the time of a collision. The whole can be bent into a “<” shape in a desirable form, and can exhibit excellent impact energy absorption performance.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings.

  FIG. 1A is a plan view of a fiber reinforced plastic automobile hood panel according to an embodiment of the present invention as viewed from the engine side, FIG. 1B is an exploded view of the hood panel, and FIG. FIG. 4 is an enlarged view of the vicinity of an inner bending introduction portion.

  In FIG. 1B, reference numeral 1 denotes a hood panel, 2 denotes an outer, and 3 denotes an inner. The outer 2 and the inner 3 are bonded and joined to form the hood panel 1 as a whole. The hood panel 1 is mounted in front of the vehicle and covers the engine room and the like (see FIG. 7), and the outer 2 is a member that forms an outer surface, and constitutes the appearance of the vehicle when attached to the vehicle. The inner 3 is arranged as a structural material on the engine room side and reinforces the outer 2.

  The inner 3 in the present invention includes a front reinforcing portion 4 extending in the width direction at the front portion of the vehicle body and a rear reinforcing portion 5 extending in the width direction at the rear portion of the vehicle body so as to surround the outer periphery along the peripheral edge portion of the outer 2. And a side reinforcing part 6 that connects the front reinforcing part 4 and the rear reinforcing part 5.

  As described above, the hood panel 1 of the present invention has a simple structure in which the outer 2 forming the outer surface and the frame-shaped inner 3 extending over the peripheral edge thereof are joined to each other as compared with the metal hood panel. It has an excellent aspect that the degree of difficulty is low in terms of structural design in the state.

  Further, the inner 3 of the present invention is 40% to 60% of the length 24 from the front end of the front reinforcing portion 4 to the rear end of the rear reinforcing portion 5 on the side reinforcing portion 6 constituting the inner 3. It is necessary to form an inner bending introduction portion 9 that extends obliquely at an angle 8 in the range of 30 ° to 60 ° from the direction toward the front of the vehicle body to the vehicle body inner side at a position 7 in the range of%.

  The inner bend introduction part 9 is a part formed with rigidity and / or strength lower than other parts, and an opening / closing mechanism part that opens and closes the hood panel 1 when an impact force such as a collision is applied to the hood panel 1. The bending input with the hood lock striker 10 attached to the front center of the vehicle body and the hinges 11 attached to both rear ends of the vehicle body as support points is concentrated on the inner bending introduction portion 9 and deformed earlier than the other portions. Therefore, it acts so that the hood panel 1 can be easily bent from this portion. Therefore, in the event of a collision with an oncoming vehicle or an object, the hood panel 1 is bent from the inner bend introduction portion 9 and the hood panel as a whole is reliably bent into a "<" shape as shown in FIG. Energy absorption performance can be exhibited.

  However, since the fiber reinforced plastic material used has a higher specific rigidity / non-strength than metal and does not undergo plastic deformation as described above, the hood panel made of fiber reinforced plastic is made of metal. Compared to a hood panel made of metal, it is hard to be deformed, and when it is deformed, it breaks down. For this reason, in the event of a collision, the hood panel is bent into a "<" shape from a predetermined position so that the impact energy can be absorbed, and the deformation is controlled so that the deformation progresses and does not lead to destruction. In the design at the time of collision, it is necessary to implement a highly difficult design in which it is necessary to combine the strength design with the rigid design.

  The present invention is a fiber reinforced plastic hood panel that has a high degree of design difficulty at the time of collision, and the fiber that can reduce the design difficulty in the design at the time of collision and can reliably achieve impact energy absorption. The company intends to provide automotive hood panels made of reinforced plastic.

  About the position on the side part reinforcement part 6 of the inner bending introduction part 9, it exists in the position 7 of the range of 40%-60% of the length 24 from the front end of the front part reinforcement part 4 to the rear end of the rear part reinforcement part 5. It is necessary. The position in this range corresponds to approximately the center of the entire hood panel, and is near the position where the maximum bending input is generated with the hood lock striker 10 and the hinge 11 as supporting points. As a result, the bending input is applied to the inner bending introduction portion 9 in a concentrated manner, and as shown in FIG. 7, the bending input is surely bent into a “<” shape, and excellent impact energy absorption performance can be exhibited.

  If the inner bend introduction part 9 is formed at a position other than this range, the bending input maximum generation position and the inner bend introduction part 9 are greatly separated from each other. No. 1 becomes difficult to bend into the shape of “ku”, and the impact energy absorption performance cannot be exhibited.

  Further, as shown in FIG. 1C, the inner bend introduction portion 9 has a length in the X direction at the inner end of the vehicle body when the vehicle longitudinal direction is the X direction and the vehicle width direction is the Y direction. The center point 12i of the vehicle body and the center point 12o of the length in the X direction of the outer end of the vehicle body are extended at an angle of 8 from the direction toward the front of the vehicle body toward the vehicle body inner side so that the center point 12i is located in front of the vehicle body from the center point 12o It is necessary to be.

  The angle 8 is the X direction between the center line 13 of the inner bend introducing portion 9 and the center point 12i of the X direction length of the inner end of the vehicle body and the center point 12o of the X direction length of the outer end of the vehicle body. It can be defined as an angle inward of the vehicle body formed by the shaft, and the angle 8 needs to be in a range of 30 ° to 60 °.

By forming the inner bending introduction portion 9 with an angle 8 within this range, as shown in FIG.
At the time of collision, the hood panel 1 bends in a “<” shape according to the angle 8 of the inner bending introduction portion 9 like a fold line 25.

  When the hood panel 1 is bent into a "<" shape and absorbs impact energy, when the deformation progresses and breaks, the inner bend introduction portion 9 is formed with lower rigidity and / or strength than the other portions. Since it is a part, the fracture occurs starting from the inner bending introduction portion 9 and progresses according to the bent ridge line 25.

  For this reason, the impact force input from the front of the vehicle body flows toward the vehicle body rearward outward direction 26 of the folding ridge line 25, and one member of the hood panel 1 destroyed in accordance with the direction is directed toward the vehicle body rearward outward direction 26. It becomes possible to prevent damage to other vehicle body parts installed behind the hood panel such as the glass 23, and further to prevent entry into the passenger cabin. This makes it possible to further improve safety performance.

  When the inner bend introducing portion 9 is formed at an angle other than this range, for example, when the inner bend introducing portion 9 is formed at an angle 8 of 0 ° (90 °), that is, parallel to the vehicle body width direction, the hood panel 1 After bending and absorbing the impact energy, when the deformation progresses and breaks down, one member of the broken hood panel 1 goes to the rear of the vehicle body along the X direction axis and is behind the hood panel such as the windshield 23 Car body parts may be damaged.

  Thus, since the inner bending introduction part 9 is formed with the angle 8, it is not necessary to consider destruction in the design at the time of collision, and the necessity of strength design is reduced. As a result, even in the design at the time of collision, it becomes possible to cope with the rigid design as a category of the structural design. Of course, it is preferable to design in detail with the strength design, but even in this case, it is possible to keep the level of confirmation.

  By forming the inner bending introduction portion 9 at the specific position 7 with the specific angle 8, a hood panel made of fiber reinforced plastic with a minimum necessary design without performing a detailed strength design in the design at the time of collision. 1 can be designed, and the force can be concentrated on the inner bend introduction part 9 more reliably, and the entire hood panel can be bent more reliably into a “<” shape as shown in FIG. It becomes possible to demonstrate performance.

  Further, even if the deformation progresses and causes destruction, as shown in FIG. 8, one member of the destroyed hood panel 1 is directed to the vehicle body rearward outward direction 26 to prevent damage to other parts of the vehicle body. It is also possible to prevent entry into the interior, and it is possible to improve safety performance.

  The inner bending introduction portion 9 in the above embodiment is formed by reducing the thickness of the inner 3 or, when the inner 3 includes a plurality of reinforcing fiber layers, the reinforcing fiber layer constituting the inner 3, for example. By partially changing the laminated structure, by partially reducing the amount of the reinforcing fiber layer, or by disposing a discontinuous portion by breaking a part of the reinforcing fiber layer, or It can be formed by disposing different types of reinforcing fiber layers having lower rigidity and / or strength than the other parts of the inner 3.

  2 to 6 are detailed views of the inner bending introduction portion 9 that is a feature of the present invention in the hood panel 1 according to the above embodiment.

  FIG. 2A is an enlarged view of the inner bending introduction portion 9A when the thickness of the inner 3 is reduced, and FIG. 2B is a cross-sectional view taken along the line AA in FIG. .

  In the present embodiment, the inner bending introduction portion 9A formed in the hood panel 1 has a cross-section V in a part of the inner 3 made of fiber reinforced plastic 16 formed by laminating a plurality of reinforcing fiber layers 14 constituting the inner 3. A character-shaped notch 15 is formed. Specifically, the notch 15 is formed on the outer surface side (engine side) of the inner by making the thickness of the fiber reinforced plastic 16 constituting the inner 3 thinner than the other portions. The notch 15 can be formed on the inner inner surface side (side in contact with the outer side), but is preferably formed on the inner outer surface side (engine side) where the load is most likely to concentrate. In addition to the V shape, the cross section can be appropriately selected, for example, in a U shape or a U shape. Among these, a V-shape in which the load is most concentrated is preferable.

  In this way, the inner bending introduction portion 9A having a lower rigidity and / or lower strength by reducing the thickness of a part of the fiber reinforced plastic 16 to be thinner than the thickness of the other part is specified at the specific position described above. If formed at an angle, the load concentrates on the inner bending introduction portion 9A and deforms / destroys at the time of collision, so that the hood panel 1 bends (see FIG. 7) and can exhibit excellent impact energy absorption performance. Become.

  Furthermore, even if the deformation has progressed and the vehicle has been destroyed, one member of the destroyed hood panel 1 is directed toward the vehicle body rearward outward direction 26 (see FIG. 8) to prevent other vehicle body parts from being damaged. It is also possible to prevent entry into the vehicle and improve safety performance.

  FIG. 3A is an enlarged view of the inner bending introduction portion 9B when the laminated structure of the reinforcing fiber layer 14 constituting the inner 3 is changed, and FIG. 3B is a cross-sectional view of FIG. It is sectional drawing of B arrow.

  In the present embodiment, the inner bending introduction portion 9B formed in the hood panel 1 is formed by partially changing the orientation angle of the reinforcing fiber layer 14 of the fiber reinforced plastic 16. Specifically, the inner bending introduction part 9B is formed by laminating mainly the reinforcing fiber layer 14A having the orientation angle layer 18 of (± 45 °). As a result, the orientation angle layer 18 (± 45 °) is mainly laminated in the inner bending introduction portion 9B, and the orientation angle layer 17 (0 ° / 90 °) is mainly laminated in the other inner portions. Here, the X direction (the longitudinal direction of the vehicle body) is 0 °.

  The fiber reinforced plastic part (inner bending introduction part 9B) mainly laminated with the orientation angle layer 18 of (± 45 °) is a fiber reinforced plastic part mainly laminated with the orientation angle layer 17 of (0 ° / 90 °). Compared with the (inner portion other than the inner bending introduction portion 9B), the rigidity and / or strength is reduced with respect to the input from the X direction.

  The orientation angle of the inner bending introduction portion 9B can be appropriately selected from other orientation angles as long as it is other than (0 ° / 90 °). However, since the rigidity and / or strength becomes higher as it approaches (0 ° / 90 °), it is preferable that the rigidity and / or strength is the lowest (± 45 °).

  Thus, if the reinforcing fiber layer 14 is formed by changing the rigidity and / or strength depending on the orientation, the inner bending introduction portion 9B having low rigidity and / or strength is formed at a specific angle at the specific position described above, At the time of collision, the load concentrates on the inner bending introduction portion 9B and is deformed / destroyed. Therefore, the hood panel 1 is bent (see FIG. 7), and excellent impact energy absorption performance can be exhibited.

  Furthermore, even if the deformation has progressed and the vehicle has been destroyed, one member of the destroyed hood panel 1 is directed toward the vehicle body rearward outward direction 26 (see FIG. 8) to prevent other vehicle body parts from being damaged. It is also possible to prevent entry into the vehicle and improve safety performance.

4A is an enlarged view of the inner bending introduction portion 9C when the amount of the reinforcing fiber layer 14 constituting the inner 3 is changed, and FIG. 4B is a cross-sectional view taken along the line CC in FIG. 4A. It is sectional drawing of an arrow.
In the present embodiment, the inner bending introduction portion 9 </ b> C formed on the hood panel 1 is formed by partially reducing the reinforcing fiber layer 14 of the fiber reinforced plastic 16. Specifically, the reinforcing fiber layer 14 is laminated on the upper and lower sides of the reinforcing fiber layer 14B having the portion 19 where the reinforcing fiber layer is not provided at the portion where the inner bending introduction portion 9C is formed, and is reinforced by bonding with a resin. An inner bending introduction portion 9C having no fiber layer (only resin is present) is formed. The portion 19 where the reinforcing fiber layer is not provided has lower rigidity and / or strength than the portion where the reinforcing fiber layer is provided.

  Other methods for partially reducing the amount of the reinforcing fiber layer 14 include, for example, reducing the apparent amount of the reinforcing fiber layer 14 by increasing the amount of resin without reducing the amount of the reinforcing fiber layer 14 (reinforcing). The method of lowering the volume content of the fiber layer can be appropriately selected. However, since the outer shape changes in this case, it is preferable to form a portion without the reinforcing fiber layer 14 in terms of design.

  If the inner bending introduction portion 9C having low rigidity and / or strength is formed at a specific angle at a specific angle by using the fact that the rigidity and / or strength varies depending on the amount of the reinforcing fiber layer 14 as described above, At the time of collision, the load concentrates on the inner bending introduction portion 9C and is deformed / destroyed. Therefore, the hood panel 1 is bent (see FIG. 7), and excellent impact energy absorption performance can be exhibited.

  Furthermore, even if the deformation has progressed and the vehicle has been destroyed, one member of the destroyed hood panel 1 is directed toward the vehicle body rearward outward direction 26 (see FIG. 8) to prevent other vehicle body parts from being damaged. It is also possible to prevent entry into the vehicle and improve safety performance.

  FIG. 5A is an enlarged view of the inner bend introduction portion 9D when the discontinuous portion 20 of the reinforcing fiber is formed by cutting a part of the reinforcing fiber layer 14 constituting the inner 3, and FIG. FIG. 5B is a cross-sectional view taken along the line DD in FIG. 5A, and FIG.

  In the present embodiment, the inner bending introduction portion 9D formed in the hood panel 1 breaks a part of the reinforcing fiber layer 14 of the fiber reinforced plastic 16 so that the reinforcing fiber layer 14 having low rigidity and / or strength can be obtained. A discontinuous portion 20 is formed and formed as an inner bending introduction portion 9D.

  Specifically, among the reinforcing fiber layers 14 of the portion forming the inner bending introduction portion 9D, the reinforcing fibers 21 of several reinforcing fiber layers 14C laminated on the inner layer are broken, and the reinforcing fiber layers 14 are formed above and below the reinforcing fibers 21. By laminating and joining with resin, an inner bending introduction portion 9D which is a discontinuous portion of the reinforcing fiber layer 14 is formed. As described above, by breaking a part of the reinforcing fiber layer 14 to form the discontinuous portion 20, the rigidity and / or strength of the portion (inner bending introduction portion 9D) is lowered.

  The reinforcing fiber layer 14C to be cut may be laminated on the outermost layer, but since the cut portion can be seen, it is preferable that the reinforcing fiber layer 14C is laminated on the inner layer.

Further, as another method for forming the discontinuous portion 20 of the reinforcing fiber layer 14, for example, the reinforcing fiber layers 14 extending from the front and rear may be simply attached without overlapping.
If the inner bending introduction portion 9D having a low rigidity and / or strength is formed at a specific angle at the specific position described above by breaking a part of the reinforcing fiber layer 14 to form the discontinuous portion 20, the collision At this time, since the load concentrates on the inner bending introduction portion 9D and is deformed / destructed, the hood panel 1 is bent (see FIG. 7), and it is possible to exhibit excellent impact energy absorption performance.

  Furthermore, even if the deformation has progressed and the vehicle has been destroyed, one member of the destroyed hood panel 1 is directed toward the vehicle body rearward outward direction 26 (see FIG. 8) to prevent other vehicle body parts from being damaged. It is also possible to prevent entry into the vehicle and improve safety performance.

  FIG. 6A is an enlarged view of the inner bending introduction portion 9E formed by disposing different types of reinforcing fiber layers 22, and FIG. 6B is an EE arrow in FIG. 6A. FIG.

  In the present embodiment, the inner bending introduction portion 9E formed in the hood panel 1 is formed by laminating different types of reinforcing fiber layers 22 having lower rigidity and / or strength than the other portions of the inner 3. It is. Specifically, the reinforcing fiber layer similar to the other part of the inner 3 is formed above and below the reinforcing fiber layer 14D having the different reinforcing fiber layers 22 having low rigidity and / or strength at the site where the inner bending introduction portion 9E is formed. 14 are laminated and joined by resin, so that an inner bending introduction portion 9E formed of different types of reinforcing fiber layers 22 having low rigidity and / or strength is formed.

  For example, carbon fibers (for example, M40 variety manufactured by Toray Industries, Inc .; Young's modulus 392 GPa, tensile strength 2.45 GPa) are used as the reinforcing fibers of the reinforcing fiber layer 14, and the different types of reinforcing fiber layers 22 having low rigidity and / or strength are used. By using glass fiber (for example, E glass; Young's modulus 75 GPa, tensile strength 2.5 GPa) as the reinforcing fiber, it is possible to form the inner bending introduction portion 9E having the same strength and low rigidity. Further, carbon fibers (for example, T700SC; Young's modulus 230 GPa, tensile strength 4.9 GPa) manufactured by Toray Industries, Inc. are used as the reinforcing fibers of the reinforcing fiber layer 14, and the reinforcing fibers of the different reinforcing fiber layers 22 having low rigidity and / or strength are used. As described above, by using carbon fiber (for example, T300 manufactured by Toray Industries, Inc., Young's modulus 230 GPa, tensile strength 3.53 GPa), it is possible to form the inner bending introduction portion 9E having the same rigidity and low strength.

Thus, by laminating the different types of reinforcing fiber layers 22 having lower rigidity and / or strength than other portions, the inner bending introduction portion 9E having lower rigidity and / or strength is formed at the specific position described above at a specific angle. Then, at the time of collision, the load concentrates on the inner bending introduction portion 9E and is deformed / destroyed, so that the hood panel 1 is bent (see FIG. 7), and excellent impact energy absorption performance can be exhibited.
Furthermore, even if the deformation has progressed and the vehicle has been destroyed, one member of the destroyed hood panel 1 is directed toward the vehicle body rearward outward direction 26 (see FIG. 8) to prevent other vehicle body parts from being damaged. It is also possible to prevent entry into the vehicle and improve safety performance.

  Furthermore, as the fiber reinforced plastic automobile hood panel 1 according to another embodiment of the present invention, the outer 2 may be a sandwich structure and the inner bending introduction portion 9 may be formed on the inner 3. Also in this embodiment, the inner bend introduction part 9 is formed at a specific angle at the specific position described above.

  The outer 2 is configured in a sandwich structure in which a core material (for example, acrylic foam) is interposed between fiber reinforced plastic skin plates substantially entirely, or the peripheral portion is a single unit of a fiber reinforced plastic skin plate. It has a plate structure, and is configured in a sandwich structure over substantially the entire portion other than the peripheral portion. This sandwich structure can exhibit high rigidity as well as light weight.

  The inner bending introduction portion 9 in the above embodiment is formed by reducing the thickness of the inner 3, or when the inner 3 includes a plurality of reinforcing fiber layers, for example, the reinforcing fiber layer constituting the inner 3 By partially changing the laminated structure of the above, or by partially reducing the amount of the reinforcing fiber layer, or by disposing a discontinuous portion by breaking a part of the reinforcing fiber layer, Alternatively, it can be formed by disposing different types of reinforcing fiber layers having lower rigidity and / or strength than other parts of the inner 3.

  In the present invention, the fiber reinforced plastic refers to a resin reinforced by a reinforcing fiber layer, and examples of the reinforcing fibers constituting the reinforcing fiber layer include inorganic fibers such as carbon fibers and glass fibers, Kevlar fibers, Examples thereof include reinforcing fibers made of organic fibers such as polyethylene fibers and polyamide fibers. From the viewpoint of easy control of surface rigidity, carbon fiber is particularly preferable. Here, “surface rigidity” refers to rigidity for maintaining an initial predetermined surface shape.

  Examples of the fiber reinforced plastic matrix resin include thermosetting resins such as epoxy resins, unsaturated polyester resins, vinyl ester resins, phenol resins, and acrylic resins, polycarbonate resins, polyethylene resins, polypropylene resins, Thermoplastic resins such as polyamide resin, polyolefin resin, dicyclopentadiene resin, polyurethane resin, polybutylene terephthalate resin, polyacetal resin, and ABS resin, and modified resins obtained by alloying these resins can also be used.

  In addition, as the core material in the case of adopting the sandwich structure, an elastic body, a foam material, and a honeycomb material can be used, and a foam material is particularly preferable for weight reduction. The material of the foam material is not particularly limited, and for example, a foam material of a polymer material such as polyurethane, acrylic, polystyrene, polyimide, vinyl chloride, or phenol can be used. The honeycomb material is not particularly limited, and for example, an aluminum alloy, paper, aramid paper, or the like can be used.

  The fiber reinforced plastic automobile food panel of the present invention can be manufactured by a known fiber reinforced plastic manufacturing method such as a hand lay-up method, an autoclave method, an RTM method, a SCRIMP method, or a SPRINT method. In particular, the RTM method and the SCRIMP method are preferable because they are excellent in mass productivity.

It is the top view which looked at the 1st mode of the food panel for automobiles made from fiber reinforced plastics of the present invention from the engine side. FIG. 2 is an exploded view of FIG. It is an enlarged view of the inner bend introduction part vicinity of Fig.1 (a). It is an enlarged view which shows an example of the inner bend introducing | transducing part in the 1st aspect of the food panel made from the fiber reinforced plastics of this invention. It is sectional drawing of the AA arrow of Fig.2 (a). It is an enlarged view which shows another example of the inner bending introducing | transducing part in the 1st aspect of the food panel made from fiber reinforced plastics of this invention. It is sectional drawing of the BB arrow of Fig.3 (a). It is an enlarged view which shows another example of the inner bending introducing | transducing part in the 1st aspect of the food panel made from fiber reinforced plastics of this invention. It is sectional drawing of CC arrow of Fig.4 (a). It is an enlarged view which shows another example of the inner bending introducing | transducing part in the 1st aspect of the food panel made from fiber reinforced plastics of this invention. It is sectional drawing of the DD arrow of Fig.5 (a). FIG. 6 is an enlarged plan view of a reinforcing fiber layer 14C in FIG. It is an enlarged view which shows another example of the inner bending introducing | transducing part in the 1st aspect of the food panel made from fiber reinforced plastics of this invention. It is sectional drawing of the EE arrow of Fig.6 (a). It is a figure which shows how to bend the food panel for automobiles made from the fiber reinforced plastic of this invention. It is a figure which shows the scattering direction of one member of the food panel which destroyed the food panel made from the fiber reinforced plastics of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Food panel 2 Outer 3 Inner 4 Front part reinforcement part 5 Rear part reinforcement part 6 Side part reinforcement part 7 The length from the front end of the front part reinforcement part 4 on the side part reinforcement part 6 to the rear end of the rear reinforcement part 5 24 in the range of 40% to 60% 8 Angle 9 Inner bending introduction portion 9A Inner bending introduction portion 9B when the thickness of the inner 3 is reduced When the laminated structure of the reinforcing fiber layer 14 constituting the inner 3 is changed Inner bending introduction portion 9C Inner bending introduction portion 9D when the amount of the reinforcing fiber layer 14 constituting the inner 3 is changed By cutting a part of the reinforcing fiber layer 14 constituting the inner 3, a discontinuous portion 20 of the reinforcing fibers Inner bend introduction part 9E when forming the inner bend introduction part 10 when formed by disposing different types of reinforcing fiber layers 22 Hood lock striker 11 Hinge 12i Inner The center point 12o of the length in the X direction of the inner end of the carcass introduction portion 9o The center point 13 of the length in the X direction of the outer end of the car body of the inner bending introduction portion 9 The center line 14 of the inner bending introduction portion 14 connecting the center point 12 Reinforcing fiber layer 15 Reinforcing fiber layer 14B having an orientation angle layer 18 having a V-shaped cutout portion 14A (± 45 °) and reinforcing fiber layer 14C having a portion 19 where no reinforcing fiber layer is provided. Discontinuity of reinforcing fibers Reinforcing fiber layer 14D having part 20 Reinforcing fiber layer 16 having different kinds of reinforcing fiber layers 22 Orientation angle layer of fiber reinforced plastic 17 (0 ° / 90 °) formed by laminating a plurality of reinforcing fiber layers 14 constituting inner 3 18 (± 45 °) orientation angle layer 19 Site where no reinforcing fiber layer is provided 20 Discontinuous portion 21 of reinforcing fiber layer 12 Reinforcing fiber 22 of reinforcing fiber layer 12C Different reinforcing fiber layer 23 Windshield 2 Vehicle rear outer direction of the front the front end from the to the rear end of the rear reinforcing portion 5 the length of the reinforcing section 4 25 fold ridge 26 fold ridgeline 25

Claims (9)

  A fiber reinforced plastic automobile hood panel in which a fiber reinforced plastic inner for reinforcing the outer is joined to a fiber reinforced plastic outer for forming an outer surface, the inner being along a peripheral edge of the outer A front reinforcing portion extending in the width direction at the front portion of the vehicle body, a rear reinforcing portion extending in the width direction at the rear portion of the vehicle body, and a side reinforcing portion connecting the front reinforcing portion and the rear reinforcing portion so as to surround the outer periphery. And extending obliquely with respect to the front-rear direction of the vehicle body at a location on the side reinforcing portion located in a range of 40% to 60% of the length from the front end of the front reinforcing portion to the rear end of the rear reinforcing portion. An automotive hood panel made of fiber-reinforced plastic, characterized in that an inner bend introduction portion having lower rigidity and / or strength than the other front and rear portions is formed.   2. The fiber reinforced plastic automobile hood panel according to claim 1, wherein the inner bend introduction portion extends obliquely at an angle in a range of 30 ° to 60 ° from the direction toward the front of the vehicle body to the inside of the vehicle body.   3. The fiber reinforced plastic automobile food panel according to claim 1, wherein the inner bend introducing portion is formed by partially reducing the thickness of the fiber reinforced plastic inner.   The inner bend introducing portion includes a plurality of reinforcing fiber layers, and the inner bend introducing portion is formed by partially changing a laminated structure of reinforcing fiber layers constituting the inner made of fiber reinforced plastic. The fiber reinforced plastic automobile food panel according to any one of claims 1 to 3. The fiber reinforced plastic automobile food panel according to any one of claims 1 to 4, wherein the inner bend introducing portion is formed by partially reducing the amount of reinforcing fibers constituting the fiber reinforced plastic inner. .   The said inner bending introduction part is formed by arrange | positioning the discontinuous part of the said reinforced fiber by cut | disconnecting a part of reinforcing fiber which comprises the said fiber reinforced plastic inner. A food panel for automobiles made of fiber-reinforced plastic as described in 1.   The inner bending introduction portion is formed by disposing different kinds of reinforcing fibers having lower rigidity and / or strength than other portions of the fiber-reinforced plastic inner. Fiber reinforced plastic automotive food panel.   The fiber reinforced plastic automobile food panel according to any one of claims 1 to 7, wherein the outer has a sandwich structure in which a core material is interposed between fiber reinforced plastic skin plates.   The said reinforcement fiber is carbon fiber, The food panel for motor vehicles made from fiber reinforced plastics in any one of Claims 1-8.

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