JP2014004888A - Floor structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor structure capable of achieving desired mechanical characteristics such as strength and rigidity while enabling weight reduction, easily developing into a wide variety of models with a small initial investment, and also developing into a floor structure for a vehicle of a general purpose vehicle model.SOLUTION: The floor structure comprises front and rear erect wall parts and a floor part connecting them, has a contour frame forming a contour of the entire structure, and a lattice frame provided at least in the floor part inside the contour frame, and has an FRP panel member to be connected to at least one of the contour frame and the lattice frame, and the FRP panel member is formed to be a panel member obtained by integrally molding a junction part extending along an outer circumferential surface of at least one of the frames to be connected to the frame by adhesion and a face plate part extending planarly from the junction part.

Description

  The present invention relates to a floor structure composed of front and rear standing wall portions and a floor portion connecting them, and particularly to a floor structure having an FRP (fiber reinforced plastic) panel member suitable for vehicles.

  In various fields typified by vehicle structures, various frame structures, particularly floor structures, constituting a skeleton are used. The floor structure can efficiently support the axial force (tensile, compression) of each frame constituting the floor structure, but supports the shear deformation (in-plane shear and twist) of the entire floor structure. In general, this is dealt with by increasing the number of frames or by reinforcing the frame connection corners partially, resulting in problems such as an increase in the number of parts, an increase in assembly steps, and an increase in weight.

  Usually, in a vehicle floor structure, a panel structure made of metal sheet metal is joined by spot welding to establish a floor structure. However, although this structure is suitable for mass production of the same shape, there are problems that it is difficult to cope with a variety of small to medium quantities and a large initial investment (for example, Patent Document 1). Further, spot welding is often used for attachment of the frame and the plate member, and such an assembly structure is not structurally efficient and has not yet solved problems such as weight increase.

  On the other hand, FRP, particularly CFRP (carbon fiber reinforced plastic) is known as a material capable of enhancing mechanical properties (strength and rigidity) while ensuring light weight. For example, although it has been proposed that the floor structure be a CFRP monocoque structure, it is a high-performance, high-performance floor structure suitable for low-volume production, which can be applied to the highest models, but has a large market. It is difficult to apply to a general-purpose vehicle model (for example, Patent Document 2).

JP 2008-215423 A JP 2012-56354 A

  Therefore, the object of the present invention is to realize desirable mechanical properties such as strength and rigidity while enabling weight reduction of the entire floor structure, and can be easily expanded to various types with a small initial investment amount. An object of the present invention is to provide a floor structure that can be developed even for a vehicle floor structure of a vehicle type.

  In order to solve the above-mentioned problems, a floor structure according to the present invention is a floor structure including front and rear standing wall portions and a floor portion connecting them, and a contour frame is formed at a site forming the contour of the entire structure. An FRP panel member joined to at least one of the contour frame and the lattice frame, and having a substantially lattice-shaped lattice frame at least on the floor portion inside the contour frame, The FRP panel member is integrally formed with a joint portion that extends along the outer peripheral surface of the at least one frame and is bonded to the frame by bonding, and a face plate portion that extends planarly from the joint portion. It is formed on the panel member.

  In the floor structure according to the present invention as described above, the frame structure of the floor structure includes a contour frame provided at a portion forming the contour of the entire structure, and a lattice substantially at least on the floor portion inside the contour frame. Since the entire skeleton is formed by these frames, the floor part is particularly reinforced by the lattice frame. First, the frame structure itself Is given appropriate strength and rigidity. An FRP panel member to be joined to at least one of the contour frame and the lattice frame is provided, and a floor structure can be constructed from the frame and the panel member. It is possible to make the panel structure mainly bear the bending rigidity and torsional rigidity of the entire floor, and to realize a lightweight and easy-to-assemble floor structure. . Furthermore, by weaving a shape suitable for adhesive bonding in the bonding portion between the panel member and the frame, it is possible to make the adhesive bonding firm and to make the assembly process simple. That is, the joint part of the panel member made of FRP is formed in a shape extending along the outer peripheral surface of the frame, and this joint part is joined to the frame by adhesion, so compared with the case where joining is performed by conventional spot welding, etc. In addition, it is possible to easily join, and the entire surface of the parts to be joined and continuous joining are possible, so that extremely high joining strength between both members can be obtained. Since the joint between the two members becomes firm, the joint portion between the frame and the panel member can be structured to reinforce and stiffen each other. In particular, since the joining portion joined to the frame is formed in a shape extending along the outer peripheral surface of the frame, the joining portion can easily have a stiffener function with respect to the frame. Since the face plate portion extends in a planar shape from the joint portion that is firmly joined to the frame of the frame structure, and the face plate portion is formed integrally with the joint portion, the face plate portion has the frame structure. It is possible to develop high strength and rigidity with respect to the load transmitted from the frame through the joint, particularly against the shear load. As a result, in the floor structure according to the present invention, mechanical properties such as strength and rigidity against shear deformation and the like are secured while ensuring the light weight of the entire floor structure in the form in which the FRP panel members are joined. Can be improved efficiently.

  In the floor structure according to the present invention, it is preferable that a space is defined in the FRP panel member by the joint portion and the face plate portion. When such a space is formed, it is possible to arrange the reinforcing means for the face plate portion in the space, and therefore it is possible to further improve the performance of the structure that bears the shear load of the face plate portion. .

  Moreover, it is preferable that the said junction part has a stiffener function which reinforces the said flame | frame, and / or is provided with the stiffener member which reinforces the said flame | frame. In other words, the joint itself having a shape extending along the outer peripheral surface of the frame may have a stiffener function with respect to the frame. Further, the stiffener may be provided separately from the joint itself extending along the outer peripheral surface of the frame. A member may be provided.

  Moreover, the form by which the flat part for other components attachment is provided in the outer surface of the said junction part is also preferable. In such a structure, other components can be easily mounted on the flat portion, and the surrounding structure can be easily considered.

  Moreover, the structure by which the contact part which regulates the film thickness of the adhesive agent provided to the said junction part in the site | part which covers the said junction part or this junction part can also be taken. The abutting portion can be composed of an FRP panel member itself or an FRP panel member that abuts against the frame. For example, the abutting portion can be formed by a rib or a seat described later, A spacer can be provided for the part to configure the contact portion. In such a structure, it is possible to make the film thickness of the adhesive more appropriate, which can contribute to the optimization and uniformity of the bonding strength.

  Moreover, the structure by which the groove | channel which can hold | maintain an adhesive agent is provided in the opposing surface to the said at least one flame | frame of the said junction part can also be taken. In such a structure, since an appropriate amount of adhesive can be secured along the groove, it is possible to easily achieve an adhesive strength of a desired level or more with respect to the adhesion site.

  Further, a structure in which at least one of an adhesive injection path and a filling path is provided on a surface of the joint portion facing the at least one frame (that is, on a joint surface of the joint portion with the frame). It can also be taken. In such a structure, even when the joint portion extends relatively long along the frame, the adhesive can be easily injected or filled into the predetermined joint portion. Thus, a desired joined state can be obtained more easily.

  Further, it is possible to adopt a structure in which the reinforcing fiber of FRP in the face plate portion is oriented in a direction of at least ± 45 degrees with respect to the reference direction. In such a structure, the in-plane shear strength in the face plate portion is efficiently increased by orienting the reinforcing fibers in the direction of ± 45 degrees, and a desirable in-plane shear stiffening structure is obtained.

  Further, a structure in which ribs and / or stiffeners are formed integrally with the face plate portion may be employed on the face plate portion. In such a structure, the strength and rigidity of the face plate portion are further enhanced by the ribs and / or stiffeners, and the in-plane shear stiffening ability is further enhanced depending on the extending direction of the ribs and / or stiffeners.

  In particular, it is preferable that ribs and / or stiffeners are integrally formed with the face plate portion in the space defined by the joint portion and the face plate portion. In such a structure, the ribs and / or stiffeners can be efficiently accommodated in the installation space of the FRP panel member, so that the mechanical properties can be improved efficiently without increasing the installation space. . The ribs and / or stiffeners may take either a form extending in a direction intersecting with the direction connecting the front and rear standing wall parts or a form extending in a direction along the direction connecting the front and rear standing wall parts. In addition, a combined form of these can also be adopted.

  Further, in the structure having the rib or / and the stiffener as described above, the rib or / and the stiffener may have a structure in which a support surface for the external part is formed. For example, a rib or / and the top surface of a stiffener can be used to form a support surface for an external component. In such a structure, it is possible to form a support surface for an external component without specially increasing the number of components, and a special space for forming the support surface is not required.

  In the FRP panel member of the present invention, the reinforcing fiber of FRP is not particularly limited, and various reinforcing fibers such as carbon fiber, glass fiber, aramid fiber, and combinations thereof can be used. In particular, it is preferable to use carbon fiber that has a high reinforcing effect and is easy to design and mold.

  Furthermore, the present invention can be applied to floor structures in various fields. In particular, when the present invention is applied to a vehicle floor structure, a desirable weight reduction effect and reinforcement effect which are strongly demanded particularly for vehicles are reliably achieved.

  Further, in the present invention, the material of the contour frame of the floor structure and the frame itself of the lattice frame is not particularly limited. However, if the frame is made of FRP, the weight of the entire structure including the FRP panel member is further reduced. Can be realized.

  As described above, according to the floor structure according to the present invention, while ensuring the light weight of the entire structure and reducing the number of assembling steps, the entire necessary portion of the frame structure in which the FRP panel members are joined is achieved. Mechanical properties such as strength and rigidity, especially bending stiffening properties and shear stiffening properties can be improved efficiently, and a floor structure suitable for use in a vehicle floor structure can be realized. In addition, a floor structure for a general-purpose vehicle that can be developed in various types can be obtained with a small initial investment without requiring a dedicated welding facility.

It is a disassembled perspective view of the floor structure concerning one embodiment of the present invention. It is an expansion partial perspective view of the Y section of the structure of FIG. It is a fragmentary perspective view which shows an example of the structure which provided the stiffener in the panel member made from FRP which has a plane part based on Z arrow of FIG. FIG. 4 is an enlarged partial longitudinal sectional view of the structure of FIG. 3 taken along line AA of FIG. 3. It is a fragmentary longitudinal cross-section which shows the example different from FIG. 4 of the structure which provided the stiffener in the panel member made from FRP which has a plane part. FIG. 4 is a partial cross-sectional view showing a modification of the structure portion of FIG. 3 as viewed along line BB of FIG. 3. It is a fragmentary perspective view which shows the modification of the structure part of FIG. It is a fragmentary perspective view which shows another modification of the structure part of FIG. It is a perspective view which shows the example of orientation of the reinforced fiber of the faceplate part in a structure. It is a perspective view which shows an example at the time of providing a rib in the structure equivalent to FIG. It is a perspective view which shows an example at the time of providing a stiffener in the structure equivalent to FIG. FIG. 11 is a perspective view illustrating an example in which a rib extending in a direction different from that in FIG. 10 is provided in the structure of FIG. 10. FIG. 12 is a perspective view illustrating an example in which a stiffener extending in a direction different from that in FIG. 11 is provided in the structure in FIG. 11.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a floor structure according to an embodiment of the present invention, and particularly shows a vehicle floor structure having the XX direction as a front-rear direction. In FIG. 1, reference numeral 100 denotes the entire floor structure, and the floor structure 100 is configured as a structure including front and rear standing wall portions 101 a and 101 b and a floor portion 102 connecting them. The floor structure 100 has a contour frame 1 at a site forming the contour of the entire structure, and a lattice frame 2 (2a, 2b, 2c) having a substantially lattice shape on at least the floor portion 102 inside the contour frame 1. )have. A floor panel 11 is disposed on the floor portion 102, a dash panel 12 is disposed on the front standing wall portion 101a, and a rear panel 13 is disposed on the rear standing wall portion 101b. In the floor structure 100, an FRP panel member is joined to at least one of the contour frame 1 and the lattice frame 2. In the example shown in FIG. 1, for example, at least a part of the floor panel 11 is configured as an FRP panel member F. As illustrated in FIG. 2, the FRP panel member F is, for example, at least one frame having a circular cross-sectional shape (in the illustrated example, the lattice frame 2 is illustrated, but the contour frame 1 may be used. The joint 3 extending along the outer peripheral surface of the frame 2 and joined to the frame 2 by bonding with an adhesive (for example, the adhesive 30 shown in FIG. 4), and the joint The face plate portion 4 having a portion extending in a planar shape from 3 and extending between the two joining portions 3 in the illustrated example is integrally formed.

  In such an embodiment, as described above, for example, the joint portion 3 having a shape extending along the outer peripheral surface of the frame 2 is joined to the frame 2 by adhesion, and therefore, when joined by conventional spot welding. Compared to the above, it is possible to easily join, to reduce the number of assembling steps, and to obtain a floor structure for general-purpose vehicles that can be developed in various types with a small initial investment. In addition, since it is possible to join the entire area to be joined, extremely high joining strength can be obtained. Further, since the joint portion 3 joined to the frame 2 is formed in a cross-sectional shape surrounding the outer peripheral surface of the frame 2, the joint portion 3 can easily have a stiffener function with respect to the frame 2. Accordingly, the joint portion 3 is firmly joined to the frame 2 and can firmly support the face plate portion 4 that extends in a planar shape from the joint portion 3 and is molded integrally with the joint portion 3. In addition, the load from the joint portion 3 can be reliably transmitted to the face plate portion 4. The face plate portion 4 extending in a planar shape is high with respect to a load transmitted from the frame of the floor structure 100 (for example, from the frame 2) through the joint portion 3, particularly with respect to a bending load or a shear load. Strength and rigidity can be expressed. Accordingly, in the form in which the FRP panel member F is joined, the mechanical properties such as strength and rigidity are efficiently enhanced with respect to bending deformation and shear deformation while appropriately securing the light weight of the entire floor structure 100. It becomes possible.

  3 and 4 show an example of a structure in which a stiffener is provided on an FRP panel member F (floor panel 11 in the illustrated example) having a flat portion. In the illustrated example, a joint portion 3 with the frame 2 is provided on the flat portion of the FRP panel member F, and the joint portion 3 is formed in a substantially U-shaped cross section so as to surround the frame 2. The top surface of the joint portion 3 is formed on the flat portion 5. The joint 3 is joined to the frame 2 by adhesion with an adhesive 30 (shown in FIG. 4), and a stiffener 6 is provided so as to cover the joint from the flat surface side of the FRP panel member F. The stiffener 6 and the adhesive 30 are joined to the FRP panel member F and the frame 2. By providing such a stiffener 6, the strength and rigidity of the joint structure in the joint portion 3 formed in the flat portion of the FRP panel member F can be greatly improved.

  FIG. 5 shows an example different from FIG. 4 of a structure in which a stiffener is provided on an FRP panel member having a flat portion. In the example of illustration, compared with the structure shown in FIG. 4, the stiffener 7 of the shape curved partially is provided so that the junction part 3 may be covered from the plane part side of the panel member F made from FRP. By adopting the shape of the stiffener 7 formed by appropriately deforming in this way, the thickness of the layer of the adhesive 30 can be more appropriately controlled when the stiffener 7 is bonded. Therefore, the stiffener 7 also serves as a means for regulating the film thickness of the adhesive 30.

  FIG. 6 shows a modification of the structure of FIG. 3 as viewed along line BB of FIG. In the illustrated example, the FRP panel member F, in particular, the frame 2 side of the joint portion 3 can be brought into contact with the frame 21 toward the rib 21 as a contact portion for regulating the film thickness of the adhesive or toward the frame 2 side. A projecting seat 22 is provided, and a spacer 23 is provided as a separate part between the joint 3 and the frame 2, and the frame 2 is interposed via the rib 21, seat 22, and spacer 23. It is possible to regulate the gap. In such a structure, it is possible to regulate the film thickness t of the adhesive 30 to a desired film thickness by regulating the gap with the frame 2 via the rib 21, the seat 22, and the spacer 23. The amount of the adhesive used can be suppressed while ensuring the adhesive strength.

  FIG. 7 shows a modification of the structure portion of FIG. In the example of illustration, the groove | channel 24 dented in the concave shape which can hold | maintain an adhesive agent is provided in the opposing surface to the flame | frame (contour frame 1 in the example of illustration) of the junction part 3. As shown in FIG. In such a structure, since an appropriate amount of adhesive can be secured in the groove 24, it is possible to easily secure an adhesive strength of a desired level or higher with respect to the adhesion site.

  FIG. 8 shows another modification of the structure of FIG. In the illustrated example, an adhesive filling path 26 made of a concave groove capable of holding the adhesive is provided on the surface of the joint 3 facing the frame 1, and the filling path 26 opens at the end. As a result, an adhesive injection path 25 is formed. In such a structure, even when the joint 3 extends relatively long in the longitudinal direction of the frame 1, the adhesive can be easily injected or filled over the entire length of the joint 3. Thus, a desired joined state can be obtained more easily.

  FIG. 9 shows an example of orientation of the reinforcing fibers 27 in the face plate portion 4 of the FRP panel member F joined to the frame 1 (or 2) of the structure. As shown in the figure, the FRP in the face plate portion 4 is such that the reinforcing fibers 27 are at least ± 45 degrees with respect to the reference direction (the FR direction in the figure (the direction toward the front wall 101a) or the RH direction (the right side direction)). It is preferably oriented in the direction. Note that the UPR direction in the figure indicates the upward direction (hereinafter the same). In the face plate portion 4, it is particularly desired to efficiently handle the shear load. By adopting such a structure, the in-plane shear strength in the face plate portion 4 can be increased efficiently, and a desired in-plane shear stiffening structure can be obtained. It is done.

  FIG. 10 shows an example of the case where the rib 32 is provided in the space 31 defined by the joint portion 3 and the face plate portion 4 in the FRP panel member F of the structure. The ribs 32 are provided, for example, so as to intersect in a direction of approximately ± 45 degrees, and are formed integrally with the FRP panel member F. In such a structure, in particular, the strength and rigidity of the face plate portion 4 are further enhanced by the ribs 32, and the in-plane shear supplementary rigidity can be further enhanced by appropriately setting the extending direction of the ribs 32. In addition, since the rib 32 is provided in the space 31 defined by the joint portion 3 and the face plate portion 4, it can be accommodated in the installation space of the FRP panel member F. It is possible to efficiently improve desired mechanical characteristics without increasing it.

  FIG. 11 shows an example of the case where the stiffener 33 is provided in the space 31 defined by the joint portion 3 and the face plate portion 4 in the FRP panel member F of the structure, as shown in FIG. Show. The stiffener 33 is provided, for example, so as to intersect in a direction of approximately ± 45 degrees, and is integrally formed with the FRP panel member F. Even in such a structure, in particular, the strength and rigidity of the face plate portion 4 can be further enhanced by the stiffener 33, and the in-plane shear supplementary rigidity can be further enhanced by appropriately setting the extending direction of the stiffener 33. In addition, since the stiffener 33 is provided in the space 31 defined by the joint portion 3 and the face plate portion 4, it can be accommodated in the installation space of the FRP panel member F, so that the installation space is exceptional. It is possible to efficiently improve desired mechanical characteristics without increasing it.

  12 and 13 show an example in which the extending direction of the rib 34 and the stiffener 35 is changed as compared with the structure shown in FIGS. 10 and 11. The rib 34 and the stiffener 35 have front and rear standing wall portions. It extends in the direction along the connecting direction. In such a structure, the bending rigidity in the longitudinal direction of the structure is particularly stiffened. The structures shown in FIGS. 10 and 11, the structures shown in FIGS. 12 and 13, and a combination of these may be appropriately selected according to the required characteristics of the part where reinforcement or stiffening is desired.

  The floor structure according to the present invention can be applied to floor structures in various fields, and is particularly suitable for use in a vehicle floor structure.

DESCRIPTION OF SYMBOLS 1 Contour frame 2, 2a, 2b, 2c Lattice frame 3 Joint part 4 Face plate part 5 Flat part 6, 7 Stiffener 11 Floor panel 12 Dash panel 13 Rear panel 21 Rib 22 Seat 23 Spacer 24 Groove 25 Filling path 26 Filling path 27 Reinforcing fiber 30 Adhesive 31 Spaces 32, 34 Ribs 33, 35 Defined by Joint and Face Plate Part Stiffener 100 Floor Structure 101a, 101b Standing Wall 102 Floor Part F FRP Panel Member

Claims (15)

  A floor structure comprising front and rear standing wall portions and a floor portion connecting them, having a contour frame at a portion forming the contour of the entire structure, and at least substantially latticed on at least the floor portion inside the contour frame An FRP panel member joined to at least one of the contour frame and the lattice frame, and the FRP panel member extends along an outer peripheral surface of the at least one frame. A floor structure characterized in that a joint part that extends and is joined to the frame by adhesion and a face plate part that extends in a planar shape from the joint part are formed on a panel member formed integrally.   The floor structure according to claim 1, wherein a space is defined in the FRP panel member by the joint portion and the face plate portion.   The floor structure according to claim 1 or 2, wherein the joint portion has a stiffener function that reinforces the at least one frame, and / or includes a stiffener member that reinforces the frame.   The floor structure according to any one of claims 1 to 3, wherein a flat portion for mounting other components is provided on an outer surface of the joint portion.   The floor structure in any one of Claims 1-4 in which the contact part which controls the film thickness of the adhesive agent provided to the said junction part is provided in the site | part which covers the said junction part or this junction part.   The floor structure according to any one of claims 1 to 5, wherein a groove capable of holding an adhesive is provided on a surface of the joint portion facing the at least one frame.   The floor structure according to any one of claims 1 to 6, wherein at least one of an adhesive injection path and a filling path is provided on a surface of the joint portion facing the at least one frame.   The floor structure according to any one of claims 1 to 7, wherein the reinforcing fibers of FRP in the face plate portion are oriented in a direction of at least ± 45 degrees with respect to a reference direction.   The floor structure according to any one of claims 1 to 8, wherein a rib or / and a stiffener are formed integrally with the face plate portion on the face plate portion.   The floor structure according to any one of claims 2 to 9, wherein a rib or / and a stiffener are integrally formed with the face plate portion in a space defined by the joint portion and the face plate portion.   The floor structure according to claim 10, wherein the ribs and / or stiffeners extend in a direction intersecting with a direction connecting the front and rear standing wall portions.   The floor structure according to claim 10, wherein the ribs and / or stiffeners extend in a direction along a direction connecting the front and rear standing wall portions.   The floor structure according to any one of claims 9 to 12, wherein the ribs and / or stiffeners form a support surface for an external part.   The floor structure according to any one of claims 1 to 13, wherein carbon fibers are used as reinforcing fibers of FRP constituting the FRP panel member.   The floor structure in any one of Claims 1-14 which is a floor structure for vehicles.

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