JP6607664B2 - Panel material for car luggage compartment - Google Patents

Description

  The present invention relates to a panel material for an automobile luggage compartment.

  Generally, a luggage compartment is provided on the rear side of the rear seat of an automobile. The luggage compartment is formed by a luggage floor trim having a carpet on the surface, and a part of the bottom surface of the luggage floor trim is made of a luggage panel material that can be opened and closed. A spare tire pan (spare tire storage section) is recessed below the luggage panel material, and storage items such as spare tires and tools are stored therein. Then, by opening and closing the luggage panel material, it is possible to put in and out a stored item such as a spare tire in the spare tire pan.

  By the way, in order to reduce the weight of the vehicle, it is necessary to reduce the weight of the entire cargo compartment.

  In response to the above problems, weight reduction of luggage compartment panel materials such as luggage panel materials has been performed. As a candidate of a lightweight member used for the panel material, for example, a resin blow molded body (resin hollow molded body) as described in Patent Document 1 is raised. Further, as a candidate for the above-mentioned panel material, for example, a hollow molded product obtained by laminating a composite sheet of polypropylene (PP) reinforced with polyester fiber on the surface of a resin hollow molded body as described in Patent Document 2, for example, and press molding Is raised.

JP-A-6-134842 Japanese Patent Laid-Open No. 11-10717

  By the way, since a large amount of luggage is placed on the luggage panel material, the panel material needs not only light weight but also rigidity. However, the resin hollow molded article described in Patent Document 1 is lightweight but has low rigidity. For this reason, in order to use the resin hollow molded body for the panel material, it is necessary to increase the thickness of the resin hollow molded body to increase the rigidity. When such a resin hollow molded body having a large thickness is used for the panel material, the storage space of the luggage compartment becomes small.

  Further, the hollow molded article described in Patent Document 2 has higher rigidity as the thickness of the PP composite sheet laminated on the surface of the resin hollow molded body during press molding is increased. Thus, when using the said hollow molded product for a panel material, it is necessary to increase the PP content in the hollow molded product, but the weight of the hollow molded product increases as the PP content increases. . When such a hollow molded product having a large weight is used for the panel material, the weight of the vehicle increases.

  Furthermore, since the resin hollow molded body and the polypropylene composite sheet described in Patent Documents 1 and 2 are composed of a thermoplastic resin, they cannot retain rigidity in use in a high temperature environment required for automobiles. There's a problem.

  The present invention has been made to solve the above-described problems, and suppresses an increase in the weight and volume of a panel material for an automobile luggage compartment, and the panel material can be used even when the automobile is used in a high-temperature environment. An object of the present invention is to provide a panel material for an automobile luggage compartment capable of maintaining rigidity.

The panel material for an automobile luggage compartment according to the present invention that achieves the above object includes a hollow plate and a thin plate-like steel plate attached to each of a pair of surface layer portions of the hollow plate. The panel material is supported at a support point provided on the vehicle body side in the steel plate portion. Out of the steel plates, at least the outer peripheral edge of the steel plate on the vehicle interior side has a concavo-convex shape that is comb-shaped or triangular in the surface direction, and an interior material is attached on the steel plate on the vehicle interior side.

  According to the panel material for an automobile cargo compartment of the present invention configured as described above, by attaching a thin plate steel plate to each of a pair of surface layer portions of the hollow plate, the panel material is configured, whereby the weight of the panel material In addition, the increase in volume can be suppressed, and even when the automobile is used in a high temperature environment, the thin plate-shaped steel plate maintains the rigidity, so that the rigidity of the panel material can be maintained.

It is the figure which looked at the luggage compartment concerning Embodiment 1 from the back of a car. It is a figure which shows the state which opened the panel material for the luggage compartment of the motor vehicle which concerns on Embodiment 1 upwards from the floor. It is sectional drawing which shows the recessed part for storage and panel material which concern on Embodiment 1, FIG. 3 (A) is a figure which shows the state which the panel material has spaced apart from the recessed part for accommodation, FIG.3 (B) It is a figure which shows the state which the panel material has covered the recessed part for accommodation. It is a perspective view which shows the structure of the panel material which concerns on Embodiment 1. FIG. It is a schematic diagram which shows an example of the shaping | molding method of the panel material which concerns on Embodiment 1, FIG. 5 (A) shape | molds a panel material by pressing, heating the steel plate and hollow plate which were coated with the thermoplastic resin. FIG. 5B is a schematic diagram showing a method of forming a panel material by pressing while heating a steel plate and a hollow plate arranged via a thermal adhesive. 5 (C) is a schematic view showing a method of forming a panel material by joining a steel plate and a hollow plate arranged via an adhesive, and FIG. 5 (D) is an assembly of the steel plate and the hollow plate. It is a schematic diagram which shows the method of shape | molding a panel material. It is sectional drawing which shows the recessed part for storage and panel material which concern on Embodiment 2, FIG. 6 (A) is a figure which shows the state which the panel material has spaced apart from the recessed part for accommodation, FIG.6 (B) It is a figure which shows the state which the panel material has covered the recessed part for accommodation. It is a perspective view which shows the structure of the panel material which concerns on Embodiment 2. FIG. It is a perspective view which shows the structure of the modification 1 of a panel material. It is a perspective view which shows the structure of the modification 2 of a panel material. These are figures which show an example of the uneven | corrugated shape formed in the outer periphery of the steel plate of the modification 2 of a panel material, FIG. 10 (A) is a figure which shows the case where an uneven | corrugated shape is a comb-tooth shape, 10 (B) is a diagram illustrating a case where the uneven shape is a triangular shape, and FIG. 10 (C) is a diagram illustrating a case where the uneven shape is a waveform. It is a perspective view which shows the structure of the modification 3 of a panel material. It is an expanded sectional view which shows the structure of the modification 3 of a panel material. It is a figure which shows the measuring method of the deflection amount which concerns on Experimental example 1, FIG. 13 (A) is sectional drawing which shows the load position at the time of deflection amount measurement, FIG.13 (B) is the load at the time of deflection amount measurement. It is a top view which shows a position. It is a figure which shows the judgment method of the presence or absence of the shape stability which concerns on Experimental example 1. FIG. It is a figure which shows the measuring method of the deflection amount concerning Experimental example 2, FIG. 15 (A) is sectional drawing which shows the load position at the time of deflection amount measurement, FIG.15 (B) is the load at the time of deflection amount measurement. It is a top view which shows a position. It is a figure which shows the judgment method of the presence or absence of the shape stability which concerns on Experimental example 2. FIG.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. The size and ratio of each member in the drawings are exaggerated for convenience of explanation and may be different from the actual size and ratio.

<Embodiment 1>
A panel material structure for an automobile luggage compartment according to Embodiment 1 will be described with reference to FIGS.

  FIG. 1 is a view of the luggage compartment 1 as viewed from the rear of the automobile. FIG. 2 is a view showing a state in which the panel material 3 for the luggage compartment 1 of the automobile is opened upward from the floor 41. 3 is a cross-sectional view showing the storage recess 2 and the panel material 3, and FIG. 3A is a view showing a state in which the panel material 3 is separated from the storage recess 2, and FIG. ) Is a diagram showing a state in which the panel material 3 covers the housing recess 2. FIG. 4 is a perspective view showing the configuration of the panel material 3. FIG. 5 is a schematic diagram showing an example of a method for forming the panel material 3. FIG. 5A is a diagram in which the steel plates 32 and 33 coated with the thermoplastic resin 34 and the hollow plate 31 are pressed while being heated. FIG. 5B is a schematic diagram showing a method of forming the panel material 3, and FIG. 5B is a diagram illustrating a panel material 3 that is pressed by heating the steel plates 32 and 33 and the hollow plate 31 that are arranged via the thermal adhesive 35. FIG. 5C is a schematic diagram showing a method for forming the panel material 3 by joining the steel plates 32 and 33 and the hollow plate 31 arranged via the adhesive material 36. FIG. 5D is a schematic diagram showing a method of forming the panel material 3 by assembling the steel plates 32 and 33 and the hollow plate 31.

  Briefly, the panel material 3 for the luggage compartment 1 of the automobile according to the first embodiment is a panel material 3 for the luggage compartment 1 of the automobile, and includes a hollow plate 31 and a pair of surface layer portions 31a of the hollow plate 31. It has the thin plate-shaped steel plates 32 and 33 attached to each of 31b. The panel material 3 is supported at support points 41 a and 41 b provided on the vehicle body 4 side in the portions of the steel plates 32 and 33. In the first embodiment, as shown in FIGS. 1 to 4, the case where the panel material 3 for the cargo compartment 1 of the automobile is a luggage board will be described as an example. However, the panel material 3 is not limited to this, and the panel material 3 may be a luggage compartment such as a luggage floor trim that covers the floor 41 that constitutes the bottom surface of the cargo compartment 1 or a luggage side trim that covers the side wall 42 that constitutes the side surface of the cargo compartment 1. 1 can be applied to the parts constituting the circuit 1. Details will be described below.

  The panel material 3 is arranged so as to cover the concave portion 2 for storage which is provided with an opening 2a for taking in and out articles provided under the floor 41 of the cargo compartment 1 of the automobile, and is supported and stored in the portions of the steel plates 32 and 33. The opening 2a of the recess 2 for use is covered.

  As shown in FIG. 1, the cargo room 1 has a bottom surface formed by a floor 41 of the vehicle body 4. A panel member 3 that is a luggage board that can be freely opened and closed is provided at the center of the floor 41. As shown in FIG. 3B, the panel material 3 is supported at support points 41 a and 41 b provided around the opening 2 a of the storage recess 2 provided in the floor 41 of the floor 41.

  The storage recess 2 is provided below the panel material 3 and stores a spare tire 5 used in an emergency.

  As shown in FIGS. 3A and 3B, the panel material 3 includes a hollow plate 31 and thin plate-like steel plates 32 and 33. The hollow plate 31 includes a pair of surface layer portions 31a and 31b, and a support portion 31c having a hollow structure and supporting the pair of surface layer portions 31a and 31b apart from each other.

  In the hollow plate 31, the pair of surface layer portions 31a and 31b and the support portion 31c are both made of the same material. The hollow plate 31 is light in weight but equal in rigidity as compared with a plate filled with the same material and having the same thickness (having no hollow structure).

  As an example of the hollow plate 31, for example, there is a honeycomb hollow plate in which the support portion 31c has a hexagonal columnar honeycomb structure. Examples of commercially available honeycomb hollow plates include, for example, Texel (registered trademark) manufactured by Gifu Plastic Industry Co., Ltd.

  As another example of the hollow plate 31, for example, there is a corrugated cardboard hollow plate in which the support portion 31c is linear or corrugated. As an example of the commercial item of a corrugated cardboard hollow board, the corrugated board (brand name) by Ube Eximo Co., Ltd. is mentioned, for example.

  As yet another example of the hollow plate 31, for example, there is an air cap hollow plate in which the support portion 31c is cylindrical. As an example of a commercially available air cap hollow plate, for example, Plastic Pearl (registered trademark) manufactured by Kawakami Sangyo Co., Ltd. may be mentioned.

  The hollow plate 31 is not limited to the above example and can be variously modified. For example, a foam or a blow molded body may be used. Further, for example, the hollow plate 31 may have a configuration in which a support portion 31c obtained by press-molding a single plate into an uneven shape is disposed between the pair of surface layer portions 31a and 31b. The hollow plate 31 has a configuration in which support portions 31c are formed by arranging boxes having upper, lower, and side surfaces adjacent to each other, and a surface layer portion is provided on each of the upper and lower surfaces of the support portion 31c. The structure which provides a surface layer part only in any one surface of a lower surface, or the structure in which each of the upper surface and lower surface of a box forms a surface layer part may be sufficient. Although the hollow plate 31 in which the surface layer portions 31a and 31b and the support portion 31c are formed from the same material is illustrated, the surface layer portions 31a and 31b and the support portion 31c can also be formed from different materials. In this embodiment, since the hollow plate 31 is used for the panel member 3 that is an automobile member, it is assumed that force is input from various directions, and therefore, an isotropic honeycomb hollow body is preferably used.

  The material of the surface layer portions 31a and 31b is not particularly limited, and examples thereof include a resin material and wood. Specific examples of the resin material include ABS resin, AES resin, styrene resin, acrylic resin, halogen-containing resin, olefin resin (polyethylene resin, polypropylene resin, cyclic olefin resin, TPO, etc.), polycarbonate resin, polyester resin (saturated). Polyester resin), polyamide resin, thermoplastic polyurethane resin, polysulfone resin (polyethersulfone, polysulfone, etc.), polyphenylene ether resin (2,6-xylenol polymer, etc.), silicone resin (polydimethylsiloxane, polymethylphenylsiloxane) Etc.). These resin materials can be used alone or in combination of two or more. In addition, for the purpose of improving impact resistance, an elastomer component such as ethylene propylene rubber or silicone rubber, or an inorganic filler such as talc or glass fiber for improving the strength may be arbitrarily mixed in the resin. Of these resins, resin materials are preferable from the viewpoint of weight reduction and economy, and olefin resins, ABS resins, polycarbonate resins, and polyamide resins are more preferable.

  The pair of surface layer portions 31a and 31b may be formed of the same material or different materials. When the pair of surface layer portions 31a and 31b are formed from different materials, for example, the material of one surface layer portion can be selected from the viewpoint of design, and the material of the other surface layer portion can be selected from the viewpoint of strength.

  The material in particular of the support part 31c is not restrict | limited, For example, a resin material, wood, etc. are mentioned, It can select from the material mentioned by the surface layer parts 31a and 31b.

  The steel plates 32 and 33 are formed in a thin plate shape, and are attached to the pair of surface layer portions 31a and 31b of the hollow plate 31, respectively. The steel plates 32 and 33 are used to reinforce the rigidity of the hollow plate 31. The steel plates 32 and 33 are used for maintaining the rigidity of the panel member 3 when the automobile is used in a high temperature environment when a hollow plate made of thermoplastic resin such as polypropylene is used as the hollow plate 31.

  The steel plates 32 and 33 are preferably made of aluminum in view of high rigidity, corrosion prevention and market availability, and galvanized steel sheets from the viewpoint of higher rigidity.

  Since the steel plates 32 and 33 have a lower linear expansion coefficient than the hollow plate 31 made of a resin material, the dimensional deformation of the hollow plate 31 in a high temperature environment (during thermal load) can be suppressed. For this reason, by attaching the steel plates 32 and 33 to the hollow plate 31, the shape quality of the panel material 3 can be improved.

  The steel plates 32 and 33 have a higher elastic modulus than the resin material, and are not easily deformed even when an external force is applied. For this reason, even if it is thin plate shape, the steel plates 32 and 33 are hard to deform | transform rather than the sheet | seat which consists of a resin material of the same thickness. Therefore, the thin plate-like steel plates 32 and 33 can impart high rigidity to the hollow plate 31 as compared with a resin sheet having the same thickness as the steel plates 32 and 33. Moreover, the steel plates 32 and 33 are less susceptible to lowering of the elastic modulus in a high temperature environment (during thermal load) than the resin material. For this reason, the steel plates 32, 33 can be attached to the hollow plate 31 to suppress a decrease in the elastic modulus of the hollow plate 31. As described above, the combination of the hollow plate 31 made of a resin material and the steel plates 32 and 33 is used for forming the panel material 3 that is lightweight and can maintain high rigidity even when used in a high temperature environment. Is preferable.

  The contour shape obtained by projecting one steel plate 32 attached to one surface layer portion 31 a of the hollow plate 31 in the direction in which the panel material 3 is supported by the support points 41 a and 41 b is attached to the other surface layer portion 31 b of the hollow plate 31. It overlaps with the contour shape of the other steel plate 32 formed.

  The steel plates 32 and 33 are provided on each of the pair of surface layer portions 31 a and 31 b of the hollow plate 31.

  As shown in FIG. 4, the steel plates 32 and 33 are arranged in the same shape symmetrically in the vertical direction via the hollow plate 31. The steel plates 32 and 33 are provided so as to cover the entire surfaces of the pair of surface layer portions 31 a and 31 b of the hollow plate 31. For this reason, the steel plates 32 and 33 can suppress the reduction | decrease in the elasticity modulus in the high temperature environment of the hollow plate 31 which consists of resin materials. As a comparison, a case where a panel formed by attaching a steel plate only to the upper surface layer portion of a hollow plate made of a resin material is used in a high temperature environment will be described. The above panel has no steel plate attached due to the panel's own weight or the load from the panel (the load from a large amount of luggage placed on the panel when the panel is provided as a luggage board in the luggage compartment). It bends so that the lower side of the hollow plate extends downward and hangs down. Such a phenomenon occurs because the lower elastic modulus of the hollow plate to which the steel plate is not attached is lower than the upper elastic modulus of the hollow plate to which the steel plate is attached. On the other hand, even when there is no load from above the panel, the panel has a lower linear expansion coefficient on the lower side of the hollow plate to which the steel plate is not attached than the upper side of the hollow plate on which the steel plate is attached. Get higher. Due to the difference in coefficient of linear expansion, in the panel, the lower side of the hollow plate to which the steel plate is not attached extends to form a valley fold and warp deformation occurs. Even in the case where the arrangement positions of the steel plates 32 and 33 through the hollow plate 31 are not symmetrical, warp deformation may occur in the same manner, which deteriorates the appearance quality.

  Since the steel plates 32 and 33 are provided so as to cover the entire surface of the pair of surface layer portions 31 a and 31 b of the hollow plate 31, the steel plates 32 and 33 cross the opening 2 a of the storage recess 2 with the hollow plate 31 interposed therebetween. (Bridge) to cover the recess 2 for storage. For this reason, the steel plates 32 and 33 can further impart rigidity to the hollow plate 31.

  The steel plates 32 and 33 are composed of divided pieces.

  As shown in FIG. 4, the steel plate 32 is composed of, for example, a plurality of divided pieces 32a, 32b, and 32c. The steel plate 33 is composed of, for example, a plurality of divided pieces 33a, 33b, and 33c. As described above, the steel plates 32 and 33 are each provided with a plurality of steel plates 32 (32a, 32b, 32c) and 33 (33a, 33b, 33c) attached to the pair of surface layer portions 31a and 31b of the hollow plate 31, respectively. Thus, the surface layer portions 31a and 31b are entirely covered. The shape of the steel plates 32 and 33 may be any shape, and in consideration of economy and workability, steel plates generally used for automobile exterior parts such as rectangular shapes, square shapes, round shapes, and belt shapes. A patch shape (seal shape) such as a reinforcing material is preferred. Further, the steel plates 32 and 33 may have a total thickness of 100 μm or less, and a plurality of steel plates 32 (32a, 32b, 32c) and 33 (33a, 33b, 33c) may be stacked and used. Good. With such a configuration, the panel material 3 is formed using a plurality of steel plates of general size without preparing a single steel plate that matches the size of the pair of surface layer portions 31a and 31b of the hollow plate 31. be able to. For this reason, the panel material 3 can be shape | molded by a cheap structure compared with the case where the big steel plate shape | molded by custom order is used.

  In the present embodiment, a configuration in which a plurality of steel plates 32 and 33 are attached and the surface layer portions 31a and 31b are respectively covered as a whole is illustrated, but the present invention is not limited to this, and one large sheet is provided for each of the surface layer portions 31a and 31b. Steel plates 32 and 33 may be attached. With such a configuration, compared to the case where a plurality of steel plates 32 and 33 are used as described above, it is easy to attach the steel plates 32 and 33 to the hollow plate 31, and the panel material 3 can be formed with a simple configuration. it can.

  The plate thicknesses T32 and T33 of the steel plates 32 and 33 are 20 μm or more and 100 μm or less. When the steel plates 32 and 33 are thinned, the weight is reduced, but the impact resistance and rigidity are lowered. On the other hand, as the steel plates 32 and 33 become thicker, the impact resistance and rigidity increase, but the weight increases. For this reason, the thicknesses T32 and T33 of the steel plates 32 and 33 are preferably 20 to 100 μm in consideration of necessary mechanical properties, lightness, availability, and workability. Further, the thicknesses T32 and T33 of the steel plates 32 and 33 are not necessarily the same, and the thickness T33 of the steel plate 33 located on the back side (the storage recess 2 side) of the panel material 3 is equal to or greater than the thickness T32 of the steel plate 32. More preferably.

  Next, a method for forming the panel material 3 by attaching the steel plates 32 and 33 to the hollow plate 31 will be described with reference to FIG.

  First, a method of forming the panel material 3 by pressing while heating the steel plates 32 and 33 coated with the thermoplastic resin 34 and the hollow plate 31 will be described with reference to FIG. The hollow plate 31 made of the thermoplastic resin 34 and the resin material coated on the steel plates 32 and 33 is pressed while being heated by the forming apparatus 100 to be formed into the panel material 3. The forming apparatus 100 includes a lower die 101 that presses while heating the steel plate 33 from the lower direction in FIG. 5A, and an upper die 102 that presses while heating the steel plate 32 from the upper direction in FIG. 5A. Have The lower mold 101 and the upper mold 102 have heating members 103 and 104 that can heat the steel plates 32 and 33 rapidly and uniformly, such as a heat oven and a heater, in the respective molds. When the steel plates 32 and 33 and the hollow plate 31 are pressed while being heated by the forming apparatus 100, the thermoplastic resin 34 coated on the steel plates 32 and 33 and the hollow plate 31 made of a resin material are melted by heating. Glue. The hollow plate 31 and the thermoplastic resin 34 that coats the steel plates 32 and 33 are made of the same material or different materials. Thereby, the panel material 3 can be shape | molded.

  Next, a method of forming the panel material 3 by pressing while heating the steel plates 32 and 33 and the hollow plate 31 disposed via the thermal adhesive 35 will be described with reference to FIG. The steel plates 32 and 33 and the hollow plate 31 arranged via the heat bonding material 35 are pressed while being heated by the forming apparatus 100 to be formed into the panel material 3. When the steel plates 32, 33 and the hollow plate 31 are pressed while being heated by the forming apparatus 100, the thermal adhesive 35 disposed between the steel plates 32, 33 and the hollow plate 31 is melted by heating, and the steel plate 32 is heated. 33 and the hollow plate 31 are bonded together. The thermal adhesive 35 is, for example, a thermal adhesive film, a thermal adhesive, or the like, and the material is not particularly limited, and examples thereof include polypropylene resin. Thereby, the panel material 3 can be shape | molded.

  Next, a method of forming the panel material 3 by joining the steel plates 32 and 33 and the hollow plate 31 arranged via the adhesive 36 will be described with reference to FIG. The adhesive 36 bonds the steel plates 32 and 33 and the hollow plate 31. The material of the adhesive 36 is not particularly limited, and examples thereof include an epoxy adhesive, a silicone adhesive, a rubber adhesive, and a resin hot melt. Thereby, the panel material 3 can be shape | molded.

  Next, a method for forming the panel material 3 by assembling the steel plates 32 and 33 and the hollow plate 31 will be described with reference to FIG. The steel plates 32 and 33 and the hollow plate 31 are assembled by a fixing member 37. The fixing member 37 is provided on each surface facing the hollow plate 31 of the steel plates 32 and 33, for example, and couples the steel plates 32 and 33 and the hollow plate 31 with nails that pierce the surface layer portions 31a and 31b of the hollow plate 31, respectively. It consists of a U-shaped staple.

  As shown in FIGS. 1 and 2, the panel member 3 is placed on the floor 41 of the vehicle body 4 so as to cover the recess 2 for storage, and is attached to be opened and closed via a hinge.

  The panel material 3 attaches the interior material 6 on the surface of the steel plate 32 (surface on the vehicle interior side). The interior material 6 is attached to the surface of the steel plate 32 (surface on the vehicle interior side) by gluing or heat welding. Examples of the interior material 6 include those obtained by laminating a nonwoven fabric, a woven fabric, paper, a film, a foamed resin, and the like. Examples of the means for forming the laminate include an adhesion method using an adhesive and a heat fusion method. As a means for heat-sealing, the panel material 3 may be heat-sealed by heat at the time of press molding.

  The panel material 3 for the luggage compartment 1 of the automobile according to Embodiment 1 described above provides the following operational effects.

  The panel material 3 for the cargo compartment 1 of the present automobile includes a hollow plate 31 and thin plate-like steel plates 32 and 33 attached to the pair of surface layer portions 31a and 31b of the hollow plate 31, respectively. The panel material 3 is supported at support points 41 a and 41 b provided on the vehicle body 4 side in the portions of the steel plates 32 and 33.

  According to this configuration, the increase in the weight and volume of the panel material 3 is suppressed by configuring the panel material 3 by attaching the thin steel plates 32 and 33 to the pair of surface layer portions 31a and 31b of the hollow plate 31, respectively. can do. Further, even when the automobile is used in a high temperature environment, the thin plate-shaped steel plates 32 and 33 continue to maintain rigidity, so that the rigidity of the panel material 3 can be maintained.

  Further, the panel material 3 for the cargo compartment 1 of the present automobile is arranged so as to cover the concave portion 2 for storage provided with an opening 2a for taking in and out articles provided under the floor 41 of the cargo compartment 1 of the automobile. The panel material 3 is supported by the portions of the steel plates 32 and 33 and covers the opening 2 a of the storage recess 2.

  According to such a configuration, the panel material 3 is used as a luggage board that covers the recess 2 for storage. Since the panel material 3 can maintain high rigidity even when used in a high temperature environment, it is possible to suppress warp deformation of the luggage board that is subjected to a large load and to improve the appearance quality.

  Furthermore, in the panel material 3 for the luggage compartment 1 of the present automobile, the hollow plate 31 includes a pair of surface layer portions 31a and 31b and a support portion 31c having a hollow structure and supporting the pair of surface layer portions 31a and 31b apart from each other. And have.

  According to such a configuration, since the hollow plate 31 has a hollow structure, compared to the case where a plate having the same material as the hollow plate 31 and having the same thickness (not having a hollow structure) is used. The panel material 3 having high rigidity and light weight can be formed.

  Furthermore, in the panel material 3 for the cargo compartment 1 of the present automobile, one steel plate 32 attached to one surface layer portion 31a of the hollow plate 31 is projected in a direction in which the panel material 3 is supported by the support points 41a and 41b. The contour shape overlaps with the contour shape of the other steel plate 32 attached to the other surface layer portion 31 b of the hollow plate 31.

  According to such a configuration, since the arrangement positions of the steel plates 32 and 33 through the hollow plate 31 are symmetric, only one of the pair of surface layer portions 31a and 31b of the hollow plate 31 does not extend in a high temperature environment, and the warp deformation occurs. Can be prevented from occurring. Thereby, the external appearance quality of the panel material 3 can be improved.

  Further, in the panel material 3 for the luggage compartment 1 of the present automobile, the steel plates 32 and 33 are provided on the entire pair of surface layer portions 31 a and 31 b of the hollow plate 31.

  According to such a configuration, since the steel plates 32 and 33 cover the entire surfaces of the pair of surface layer portions 31a and 31b of the hollow plate 31, a decrease in the elastic modulus in the high-temperature environment of the hollow plate 31 made of a resin material is suppressed. can do. Thereby, the rigidity of the hollow plate 31 can be maintained, and the appearance quality of the panel material 3 can be improved.

  Furthermore, in the panel material 3 for the luggage compartment 1 of the present automobile, the steel plate 32 is composed of divided pieces 32a, 32b, and 32c. The steel plate 33 is composed of divided pieces 33a, 33b, and 33c.

  According to such a configuration, the panel member 3 can be formed by using a plurality of steel plates 32 and 33 having a general size without preparing a single large steel plate that matches the size of the pair of surface layer portions 31a and 31b of the hollow plate 31. Can be molded. For this reason, the panel material 3 can be shape | molded by a cheap structure compared with the case where the big steel plate shape | molded by custom order is used.

  Furthermore, in the panel material 3 for the luggage compartment 1 of the present automobile, the plate thicknesses T32 and T33 of the steel plates 32 and 33 are 20 μm or more and 100 μm or less.

  According to this configuration, the thicknesses T32 and T33 of the steel plates 32 and 33 are set to 20 to 100 μm in consideration of necessary mechanical properties, light weight, availability, and workability. By using the steel plates 32 and 33 having such plate thicknesses T32 and T33, the panel material 3 that is lightweight and has high impact resistance and rigidity can be formed.

<Embodiment 2>
Next, the panel member 13 for the luggage compartment 1 of the automobile according to the second embodiment will be described with reference to FIGS. 6 and 7.

  6 is a cross-sectional view showing the storage recess 2 and the panel material 13, and FIG. 6A is a view showing a state in which the panel material 13 is separated from the storage recess 2, and FIG. ) Is a diagram showing a state in which the panel material 13 covers the housing recess 2. FIG. 7 is a perspective view showing the configuration of the panel material 13.

  Unlike the steel plates 32 and 33 of the panel material 3 of the first embodiment, the steel plates 132 and 133 of the panel material 13 of the second embodiment are provided in a part of each of the pair of surface layer portions 31 a and 31 b of the hollow plate 31.

  The storage recess 2 of the second embodiment stores not only the spare tire 5 but also the raising material 7 as in the storage recess 2 of the first embodiment. The raising material 7 is provided on the spare tire 5 and used to fill a gap between the spare tire 5 and the panel material 13 in a state where the panel material 13 covers the housing recess 2. By providing the raised material 7 on the spare tire 5, it is possible to prevent the panel material 3 from being warped and deformed when the panel material 13 receives a load from an article stored in the luggage compartment 1. The panel material 13 is supported at the support points 41 a provided on the floor 41 on the vehicle body 4 side and the support points 7 a provided on the raising material 7 in the portions of the steel plates 132 and 133.

  As shown in FIGS. 6 and 7, the steel plates 132 and 133 are provided so as to cover a part of each of the pair of surface layer portions 31 a and 31 b of the hollow plate 31. Note that the steel plates 132 and 133 are formed in the same shape symmetrically in the vertical direction via the hollow plate 31. The steel plates 132 and 133 are not provided so as to cross (bridge) the opening 2a of the storage recess 2 and cover the storage recess 2 like the steel plates 32 and 33 of the first embodiment. It is provided so as to bridge the raising material 7. As described above, in the case where the panel material 13 is supported by the spare tire 5 and the lifting material 7 stored in the storage recess 2, the load from the surface (vehicle compartment side) direction on the panel material 13 is the vehicle body. It is dispersed not only at the support points 41 a provided on the floor 41 on the 4 side but also at the support points 7 a provided on the raising material 7. Therefore, in the case where the panel material 13 is supported not only by the support point 41 a provided on the floor 41 but also by the support point 7 a provided on the raising material 7, the steel plates 132 and 133 are paired with the surface layer portions 31 a of the hollow plate 31. , 31b can be provided only in a part where the rigidity is insufficient. Therefore, in the second embodiment, as in the first embodiment, the weight is reduced as compared with the panel material 3 formed by providing the steel plates 32 and 33 on the whole of the pair of surface layer portions 31a and 31b of the hollow plate 31. Panel material 13 can be formed. Thereby, compared with the structure of Embodiment 1, the panel material 13 which is a base material which comprises the luggage compartment 1 can be reduced in weight.

  In the second embodiment, a case where a part of the surface layer portion 31 a of the hollow plate 31 is covered with one steel plate 132 and a part of the surface layer portion 31 b is covered with one steel plate 133 is described as an example. However, the present invention is not limited to this. For example, one of the strip-shaped steel plates may be attached along two sides facing each other among the sides of the pair of surface layer portions 31a and 31b of the hollow plate 31. . With such a configuration, the steel plates 132 and 133 can be attached only to the respective portions where the rigidity of the hollow plate 31 is insufficient. Therefore, as in the first embodiment, compared with the panel material 3 formed by providing the steel plates 32 and 33 on the whole of the pair of surface layer portions 31a and 31b of the hollow plate 31, the panel material is lightweight while maintaining high rigidity. 13 can be molded.

  The panel material 13 for the luggage compartment 1 of the automobile according to Embodiment 2 described above provides the following operational effects.

  In the panel material 13 for the cargo compartment 1 of the present automobile, the steel plates 132 and 133 are provided in a part of each of the pair of surface layer portions 31 a and 31 b of the hollow plate 31.

  According to such a configuration, when the panel material 3 is supported not only by the floor 41 of the vehicle body 4 but also by the spare tire 5 and the lifting material 7, the steel plates 132 and 133 are formed of the pair of surface layer portions 31 a of the hollow plate 31. It can be provided only in a part where the rigidity of each of 31b is insufficient. Therefore, as in the first embodiment, compared to the panel material 3 in which the steel plates 32 and 33 are provided on the whole of the pair of surface layer portions 31a and 31b of the hollow plate 31, a lightweight panel while maintaining high rigidity. The material 13 can be molded. Thereby, compared with the structure of Embodiment 1, the panel material 3 which is a base material which comprises the luggage compartment 1 can be reduced in weight, maintaining rigidity.

<Modification 1>
Next, the modification 1 (panel material 23) of a panel material is demonstrated, referring FIG. In the description, the first modification has been described as a modification of the first embodiment, but can be applied to the second embodiment.

  FIG. 8 is a perspective view showing the configuration of the panel member 23 of the first modification.

  Unlike the steel plates 32 and 33 of the panel material 3 of Embodiment 1, the steel plates 232 and 233 of the panel material 23 of Modification 1 are formed with at least one or more through holes 232a and 233a.

  The through holes 232a and 233a are formed in order to reduce the weight of each of the steel plates 232 and 233. As shown in FIG. 8, the through holes 232 a and 233 a have, for example, a square shape, and a plurality of the through holes 232 a and 233 a are formed in a mesh shape by forming a plurality of through holes. Moreover, the shape of the through holes 232a and 233a is not limited to the above configuration, and may be, for example, a rectangular shape, a round shape, a band shape, or a polygonal shape. The through holes 232a and 233a are formed in an appropriate size in consideration of the strength and rigidity of the steel plates 232 and 233 through which the through holes 232a and 233a are penetrated. Thus, by forming the through holes 232a and 233a in the steel plates 232 and 233, respectively, the weight of the panel material 3 can be further reduced while maintaining the rigidity of the panel material 3.

  The panel material modification 1 (panel material 23) described above provides the following operational effects.

  In the modification 1 (panel material 23) of the panel material, the steel plates 232 and 233 of the panel material 23 are different from the steel plates 32 and 33 of the panel material 3 of the first embodiment, and at least one or more through holes 232a and 233a are formed. Is done.

  According to such a configuration, by forming the through holes 232a and 233a in the steel plates 232 and 233, respectively, it is possible to reduce the weight of the panel material 3 that is a base material constituting the luggage compartment 1 while maintaining rigidity. .

<Modification 2>
Next, modification 2 (panel material 43) of the panel material will be described with reference to FIG.

  FIG. 9 is a perspective view showing the configuration of the panel member 43 of the second modification. FIG. 10 is a diagram illustrating an example of the concavo-convex shape formed on the outer peripheral edge 432a of the steel plate 432 of the panel material 43 of the second modification, and FIG. 10A illustrates a case where the concavo-convex shape is a comb-teeth shape. FIG. 10B is a diagram illustrating a case where the uneven shape is a triangular shape, and FIG. 10C is a diagram illustrating a case where the uneven shape is a waveform.

  In the panel material 43 of the second modification, at least the outer peripheral edge 432a of the steel plate 432 on the vehicle interior side has an uneven shape in the plane direction among the steel plates 432 and 433, and the interior material 6 is formed on the steel plate 432 on the vehicle interior side. Install (see Fig. 2).

  As shown in FIG. 9, the steel plate 432 of the panel member 43 of the modification 2 is inconspicuous in the level difference D caused by the thickness of the steel plate 432 between the portion of the hollow plate 31 where the steel plate 432 is attached and the portion where it is not attached. Therefore, the outer peripheral edge 432a is formed in an uneven shape in the surface direction. The outer peripheral edge 432a is formed in an uneven shape by cutting the outer peripheral edge 432a with an uneven blade. Thereby, in the panel material 43 of the modified example 2, since the unevenness shape is formed in the step D portion, which was viewed as a straight line in the panel material 13 of the second embodiment, in the direction perpendicular to the straight line, the step D appears as a straight line. The step D can be made difficult to understand.

  Even if the steel plate 432 has an uneven shape on the outer peripheral edge 432a, the contour shape when the convex portions are virtually continuously connected is the same as the contour shape of the steel plate 433. The arrangement position via the plate 31 is symmetrical. Thereby, only one of a pair of surface layer parts 31a and 31b of the hollow plate 31 does not extend in a high-temperature environment, and warpage deformation can be suppressed. In the second modification, as shown in FIG. 9, the case where the uneven shape is formed only in the portion related to the step D in the outer peripheral edge 432 a of the steel plate 432 is illustrated. However, the present invention is not limited to this, and an uneven shape may be formed on the entire outer peripheral edge 432 a of the steel plate 432. By forming the concavo-convex shape on the outer peripheral edge 432a of the steel plate 432, the floating of the interior material 6 by the outer peripheral edge 432a can be suppressed. In the second modification, the case where the uneven shape is formed only on the outer peripheral edge 432a of the steel plate 432 is illustrated. However, the present invention is not limited to this, and an uneven shape may be formed on the outer peripheral edge of the steel plate 433.

  As a configuration for making the step D inconspicuous, for example, a configuration in which a nonwoven fabric having a high basis weight is laminated on the steel plate 432 of the panel material 43 is conceivable. However, since a nonwoven fabric with a high basis weight increases in weight, when a nonwoven fabric with a low basis weight is attached on the panel material 43 for weight reduction, the thickness of the steel plate 432 appears as a float of the nonwoven fabric. The panel material 3 in which such a non-woven fabric floats deteriorates the appearance quality. Therefore, in the second modification, the outer peripheral edge 432a of the steel plate 432 is configured to have an uneven shape, thereby making the step D of the panel material 43 inconspicuous, thereby improving the appearance quality of the panel material 43.

  Next, a specific example of the uneven shape formed on the outer peripheral edge 432a of the steel plate 432 will be described with reference to FIG.

  As shown in FIG. 10A, the uneven shape may be, for example, a comb tooth shape K. Further, as shown in FIG. 10B, the uneven shape may be, for example, a triangular shape S. Furthermore, as shown in FIG. 10C, the uneven shape may be, for example, a waveform shape N.

  The panel material modification 2 (panel material 43) described above provides the following effects.

  In Modification 2 (panel material 43) of the panel material, of the steel plates 432 and 433, at least the outer peripheral edge 432a of the steel plate 432 on the vehicle interior side has an uneven shape in the surface direction, and the steel plate 432 on the vehicle interior side has The interior material 6 is attached on the top.

  According to such a configuration, since the concave and convex shape is formed in the outer peripheral edge 432a of the steel plate 432 in the direction perpendicular to the outer peripheral edge 432a, the floating of the interior material 6 by the outer peripheral edge 432a can be suppressed. Thereby, the appearance quality of the panel material 43 can be improved.

<Modification 3>
Next, a modification 3 (panel material 53) of the panel material will be described with reference to FIGS.

  FIG. 11 is a perspective view showing the configuration of the panel material 53 of the third modification. FIG. 12 is an enlarged cross-sectional view showing the configuration of the panel material 53 of the third modification.

  In the panel material 53 of the third modification, at least the outer peripheral edge 532a of the steel plate 532 on the vehicle interior side of the steel plates 532 and 533 is at least 80% toward the end with respect to the thickness of the central portion of the steel plate 432. It is thinned to the thickness of.

  As shown in FIGS. 11 and 12, the steel plate 432 of the panel material 53 of the modification 3 has a step D caused by the thickness of the steel plate 532 between the portion where the steel plate 532 is attached and the portion where the steel plate 532 is not attached. In order to make the image inconspicuous, the outer peripheral edge 532a is thinned toward the end (thinned with an inclination). The outer peripheral edge 532a is thinned by being inclined and filed. Thereby, in the panel material 53 of the modified example 3, as in the panel material 43 of the modified example 2, since the step D portion that was seen in a straight line is inclined, the step D can be made difficult to understand. In the third modification, only the outer peripheral edge 532a of the steel plate 532 is illustrated as being thinned toward the end. However, the present invention is not limited to this, and the outer peripheral edge of the steel plate 533 may be thinned toward the end.

  Even if the outer peripheral edge 532a is made thinner toward the end, the steel plate 532 has the same contour shape as the steel plate 533, and therefore the arrangement positions of the steel plates 532 and 533 via the hollow plate 31 are symmetrical. Thereby, only one of a pair of surface layer parts 31a and 31b of the hollow plate 31 does not extend in a high-temperature environment, and warpage deformation can be suppressed. In the third modification, as illustrated in FIG. 11, the case where only the portion related to the step D in the outer peripheral edge 532 a of the steel plate 532 is thinned is illustrated. However, the present invention is not limited to this, and the entire outer peripheral edge 532a of the steel plate 532 may be thinned toward the end. By thinning the outer peripheral edge 532a of the steel plate 532 toward the end, it is possible to suppress the floating of the interior material 6 by the outer peripheral edge 532a. Further, the thickness of the outer peripheral edge 532a of the steel plate 532 is at least 80% toward the end with respect to the thickness of the central portion of the steel plate 532 in order to suppress the floating of the interior material 6 by the outer peripheral edge 532a. It is preferable that the thickness is reduced to a thickness of. Thereby, the appearance quality of the panel material 53 can be improved.

  The modification 3 (panel material 53) of the panel material described above provides the following operational effects.

  In Modification 3 (panel material 53) of the present panel material, of the steel plates 532 and 533, at least the outer peripheral edge of the steel plate 532 on the vehicle interior side faces the end with respect to the thickness of the central portion of the steel plate 532. The thickness is reduced to at least 80%.

  According to such a configuration, the outer peripheral edge 532a of the steel plate 532 is thinned to a thickness of at least 80% toward the end portion, so that the interior material 6 can be prevented from floating due to the outer peripheral edge 532a. Thereby, the appearance quality of the panel material 53 can be improved.

  Hereinafter, the panel materials for the cargo compartment of the first and second embodiments and the first to third modifications will be described in more detail by Experimental Examples 1 and 2, but the panel material is not limited to these. Absent.

<Experimental example 1>
Hereinafter, as Experimental Example 1, Example 1 and Comparative Examples 1 and 2 will be described with reference to FIGS. 13 and 14. In Example 1, the panel material 3 of Embodiment 1 in which the steel plates 32 and 33 were attached to the entire surface layer portions 31a and 31b of the hollow plate 31 was used.

  13A and 13B are diagrams showing a method of measuring a deflection amount according to Experimental Example 1, FIG. 13A is a cross-sectional view showing a load position at the time of deflection amount measurement, and FIG. 13B is a deflection amount. It is a top view which shows the load position at the time of a measurement. FIG. 14 is a diagram illustrating a method for determining the presence or absence of shape stability according to Experimental Example 1.

  In order to compare the amount of deflection of the various panel materials of Example 1 and Comparative Examples 1 and 2, as shown in FIGS. 13A and 13B, the surfaces of the various panel materials 3 covering the storage recess 2 A load of 245 N (25 Kg) was applied on 3a with a loader K1 having a diameter of 50 mm (about 20 seconds). The position where the load is applied toward the center portion of the space of the recess 2 for storage on the surface 3a of the panel material 3 is set as the load position PP. A distance T from the bottom surface 2b of the storage recess 2 to the back surface 3b of the panel member 3 when the load was applied and when the load was not applied was measured, and the amount of deflection was calculated based on the difference between the measurement results. The measurement temperature was 23 ° C. for room temperature and 50 ° C. for high temperature.

  In order to determine the presence or absence of shape stability of the various panel materials 3 of Example 1 and Comparative Examples 1 and 2, as shown in FIG. 7, on the surface 3a of the various panel materials 3 covering the storage recess 2 A load of 490 N (50 kg) was applied with an indenter K2 of 430 mm × 660 mm. It was visually determined whether the panel material 3 was deformed after the load was applied, and it was determined whether or not the shape was stable. The measurement temperature was set to 95 ° C.

<Example 1>
As the base material (hollow plate 31) of the panel material 3, a honeycomb hollow structure made of polypropylene was used. As the steel plates 32 and 33 attached to the surface layer portions 31a and 31b of the hollow plate 31, those made of galvanized steel plates (galvanized steel plates) and having thicknesses T32 and T33 of 50 μm and coated with polypropylene were used. The panel 3 was formed by pressing the hollow plate 31 and the steel plates 32 and 33 while heating them. The panel material 3 was formed so that the length × width × thickness was 520 mm × 1200 mm × 5 mm and the weight was 1450 g.

  The amount of deflection at room temperature was 5 mm.

  The amount of deflection at high temperature was 5 mm.

  The shape stability was present (no deformation).

<Comparative Example 1>
As the base material of the panel material 3, wood (woody panel material) generally used in light vehicles is used. No steel plate was used. A base material made of wood was used as the panel material 3. As the panel material 3, a hollow plate 31 made of wood having a size of length × width × thickness of 520 mm × 1200 mm × 7 mm and a weight of 2400 g was used.

  The amount of deflection at room temperature was 30 mm.

  The amount of deflection at high temperature was 30 mm.

  The shape stability was none (with deformation).

<Comparative Example 2>
A blow molded body made of polypropylene was used as the base material of the panel material 3. No steel plate was used. A base material made of a blow molded article was used as the panel material 3. As the panel material 3, a hollow plate 31 made of a blow molded body having a size of length × width × thickness of 520 mm × 1200 mm × 25 mm and a weight of 2600 g was used. In Comparative Example 2, the panel material 3 is composed only of a blow-molded body made of polypropylene. Therefore, in order to increase the rigidity, the thickness of the base material was increased compared to Example 1 and Comparative Example 1.

  The amount of deflection at room temperature was 5 mm.

  The amount of deflection at high temperature was 10 mm.

  The shape stability was none (with deformation).

  Table 1 summarizes the test results of the deflection amount and the shape stability of Example 1 and Comparative Examples 1 and 2.

<Comparison result 1>
In Example 1, compared with Comparative Examples 1 and 2, when the panel material 3 was used at room temperature and in a high temperature environment, the amount of deflection was small, and there was no change in the amount of deflection due to the difference in temperature. In Example 1, the panel material 3 had shape stability (no deformation). This is because the steel plates 32 and 33 are attached to the entire surface layer portions 31 a and 31 b of the hollow plate 31, so that the steel plates 32 and 33 are arranged in the same shape symmetrically up and down via the hollow plate 31. Thus, it is considered that only one of the pair of surface layer portions 31a and 31b of the hollow plate 31 does not extend in a high temperature environment, and it is possible to suppress the occurrence of warping deformation. Moreover, Example 1 can be lightweight and retain high rigidity while reducing the thickness of the base material (hollow plate 31) as compared with Comparative Examples 1 and 2. For this reason, Example 1 can suppress the increase in the volume of the panel material 3 compared with Comparative Example 1 and 2. FIG.

  Compared with Example 1, Comparative Example 1 had a large amount of deflection and no shape stability (with deformation) when panel material 3 was used in a room temperature and high temperature environment. This is considered to be because the rigidity of wood (woody panel material) is low at both room temperature and high temperature environment.

  In Comparative Example 2, the amount of deflection was small as in Example 1 when the panel material 3 was used at room temperature compared to Example 1, but the amount of deflection was large when used in a high temperature environment. And Comparative Example 2 had no shape stability (with deformation). This is presumably because the blow-molded body made of polypropylene is a thermoplastic hollow body and has high rigidity at room temperature but low rigidity in a high-temperature environment.

<Experimental example 2>
Hereinafter, Example 2 and Comparative Examples 3 and 4 will be described as Experimental Example 2 with reference to FIGS. 15 and 16. In Example 2, the panel material 13 of Embodiment 2 in which the steel plates 132 and 133 were attached to a part of each of the surface layer portions 31a and 31b of the hollow plate 31 was used.

  15A and 15B are diagrams showing a method of measuring a deflection amount according to Experimental Example 2, FIG. 15A is a cross-sectional view showing a load position when measuring the deflection amount, and FIG. 15B is a deflection amount. It is a top view which shows the load position at the time of a measurement. FIG. 16 is a diagram illustrating a method for determining the presence or absence of shape stability according to Experimental Example 2.

  In order to compare the amount of deflection of the various panel materials of Example 2 and Comparative Examples 3 and 4, as shown in FIGS. 15A and 15B, the surface of the various panel materials 13 covering the storage recess 2 A load of 245 N (25 Kg) was applied on 13a with a loader K1 having a diameter of 50 mm (about 20 seconds). A position on the surface 13a of the panel member 13 where a load is applied toward the central portion of the space of the recess 2 for storage (the space where the space between the spare tire 5 and the raising member 7 and the side wall 2c is the largest). The load position KP was set. A distance T from the bottom surface 2b of the storage recess 2 to the back surface 13b of the panel member 3 when the load was applied and when the load was not applied was measured, and the amount of deflection was calculated based on the difference between the measurement results. The measurement temperature was 23 ° C. for room temperature and 50 ° C. for high temperature.

  In order to judge the presence or absence of shape stability of the various panel materials 13 of Example 2 and Comparative Examples 3 and 4, as shown in FIG. 16, on the surface 13a of the various panel materials 13 covering the storage recess 2 A load of 490 N (50 kg) was applied with an indenter K2 of 430 mm × 660 mm. It was judged visually whether or not the panel material 13 was deformed after loading, and the presence or absence of shape stability was judged. The measurement temperature was set to 95 ° C.

<Example 2>
As the base material (hollow plate 31) of the panel material 13, a honeycomb hollow structure made of polypropylene was used. As the steel plates 132 and 133 attached to the surface layer portions 31a and 31b of the hollow plate 31, those made of galvanized steel plates and having thicknesses T32 and T33 of 50 μm and coated with polypropylene were used. The panel material 13 was formed by pressing the hollow plate 31 and the steel plates 132 and 133 while heating them. The panel material 13 was formed so that the length × width × thickness was 650 mm × 840 mm × 5 mm and the weight was 1200 g.

  The amount of deflection at room temperature was 7 mm.

  The amount of deflection at high temperature was 7 mm.

  The shape stability was present (no deformation).

<Comparative Example 3>
As the base material of the panel material 13, wood (woody panel material) generally used in light cars is used. No steel plate was used. A base material made of wood was used as the panel material 13. As the panel material 13, a hollow plate 31 made of wood having a size of length × width × thickness of 650 mm × 840 mm × 7 mm and a weight of 2200 g was used.

  The amount of deflection at room temperature was 10 mm.

  The amount of deflection at high temperature was 10 mm.

  The shape stability was none (with deformation).

<Comparative Example 4>
A blow molded body made of polypropylene was used as the base material of the panel material 13. No steel plate was used. A base material made of a blow molded article was used as the panel material 13. As the panel material 13, a hollow plate 31 made of a blow molded body having a size of length × width × thickness of 650 mm × 840 mm × 25 mm and a weight of 2500 g was used. In Comparative Example 4, the panel material 13 is composed only of a blow-molded body made of polypropylene. Therefore, in order to increase the rigidity, the thickness of the base material is increased compared to Example 2 and Comparative Example 3.

  The amount of deflection at room temperature was 7 mm.

  The amount of deflection at high temperature was 10 mm.

  The shape stability was none (with deformation).

  Table 2 summarizes the deflection amount and shape stability test results of Example 2 and Comparative Examples 3 to 4.

<Comparison result 2>
In Example 2, as compared with Comparative Examples 3 and 4, when the panel material 13 was used at room temperature and in a high temperature environment, the amount of deflection was small and there was no change in the amount of deflection due to the difference in temperature. In Example 2, the panel material 13 had shape stability (no deformation). This is because even when the steel plates 132 and 133 are attached to a part of the surface layer portions 31a and 31b of the hollow plate 31, the steel plates 132 and 133 are arranged in the same shape symmetrically in the vertical direction via the hollow plate 31. Thus, it is considered that only one of the pair of surface layer portions 31a and 31b of the hollow plate 31 does not extend in a high temperature environment, and it is possible to suppress the occurrence of warping deformation. In addition, compared with Comparative Examples 3 and 4, Example 2 is lightweight and can retain high rigidity while reducing the thickness of the base material (hollow plate 31). For this reason, Example 2 can suppress the increase in the volume of the panel material 13 compared with the comparative examples 3 and 4. FIG.

  Compared with Example 2, Comparative Example 3 had a large amount of deflection and no shape stability (with deformation) when panel material 13 was used in a room temperature and high temperature environment. This is presumably because wood (wood panel material) has low rigidity at both room temperature and high temperature.

  In Comparative Example 4, the amount of deflection was small as in Example 2 when the panel material 13 was used at room temperature as compared with Example 2, but the amount of deflection was large when used at a high temperature. And Comparative Example 4 had no shape stability (with deformation). This is presumably because the blow-molded body made of polypropylene is a thermoplastic hollow body and has high rigidity at room temperature but low rigidity at high temperature.

  In addition, the present invention can be variously modified based on the configurations described in the claims, and these are also within the scope of the present invention.

  The panel material for the cargo compartment of the automobile of the present invention is lightweight, can suppress the volume, and can maintain rigidity even at the time of a heat load such as a high temperature environment, not only the luggage board described in the embodiment, It can be applied to any cargo space such as rear parcel board, rear deck board, luggage floor trim, luggage side trim, and trunk bed.

  Moreover, in the panel material for the luggage compartment of the automobile of the present invention, a three-dimensional shape (texture or pattern) may be attached to the steel plate for the purpose of imparting design properties to the steel plate.

1 luggage compartment,
2 recess for storage,
2a opening,
2b bottom,
2c side wall,
3, 13, 23, 43, 53 Panel material,
3a, 13a surface,
3b, 13b reverse side,
4 Body,
5 Spare tires
6 Interior materials,
7 Raising material,
7a, 41a, 41b support points,
31 hollow plate,
31a, 31b surface layer part,
31c support part,
32, 33, 132, 133, 232, 233, 432, 433, 532, 533 steel plate,
34 thermoplastic resin,
35 thermal adhesive,
36 Adhesive,
37 fixing member,
41 floors,
100 molding equipment,
101 Lower mold,
102 Upper mold,
103, 104 heating member,
232a, 233a through hole,
432a, 532a outer peripheral edge,
D step,
K comb shape,
KP load point,
K1 loader,
K2 indenter,
N waveform shape,
P pressurization,
S triangle shape,
T deflection amount,
T32, T33 The plate thickness of the steel plates 32, 33.

Claims (11)

A panel material for an automobile luggage compartment,
A hollow plate,
A sheet steel plate attached to each of the pair of surface layer portions of the hollow plate,
The panel material is supported at a support point provided on the vehicle body side in the portion of the steel plate,
Of the steel plates, at least the outer peripheral edge of the steel plate on the vehicle interior side has a concave-convex shape that is a comb-teeth shape or a triangular shape in the surface direction, and an interior material is attached on the steel plate on the vehicle interior side. Panel material for cargo compartments.   It is arranged so as to cover a recessed portion for storage provided with an opening for taking in and out articles provided under the floor of the cargo compartment of the automobile, and is supported by a portion of the steel plate and covers the opening of the recessed portion for storage. The panel material for the luggage compartment of the motor vehicle according to claim 1.   The panel for an automobile luggage compartment according to claim 1 or 2, wherein the hollow plate has the pair of surface layer portions and a support portion that has a hollow structure and supports the pair of surface layer portions apart from each other. Wood.   The contour shape obtained by projecting one of the steel plates attached to one surface layer portion of the hollow plate in a direction in which the panel material is supported by the support point is attached to the other surface layer portion of the hollow plate. The panel material for the cargo compartment of the automobile according to any one of claims 1 to 3, wherein the panel material overlaps with a contour shape of the other steel plate.   The said steel plate is a panel material for the cargo compartment of the motor vehicle of any one of Claims 1-4 provided in each whole of the said pair of surface layer part of the said hollow plate.   The said steel plate is a panel material for the luggage compartment of the motor vehicle of any one of Claims 1-4 provided in each one part of each of a pair of said surface layer part of the said hollow plate.   The said steel plate is the panel material for the luggage compartment of the motor vehicle of any one of Claims 1-6 comprised from the division piece.   The board | plate material for the luggage compartment of the motor vehicle of any one of Claims 1-7 whose board thickness of each of the said steel plates is 20 micrometers or more and 100 micrometers or less.   The panel material for an automobile luggage compartment according to any one of claims 1 to 8, wherein the steel plate has at least one or more through holes formed therein.   The outer peripheral edge of the steel plate at least on the passenger compartment side of the steel plate is thinned to at least 80% toward the end with respect to the thickness of the central portion of the steel plate. The panel material for the luggage compartment of the vehicle of any one of Claims 1.   The steel plate on the vehicle interior side has a contour shape when the convex and concave portions which are comb-like shapes or triangular shapes formed on the outer peripheral edge are virtually continuously connected, and the contour shape of the other steel plate The panel material for the luggage compartment of the automobile according to any one of claims 1 to 3.