JP2019084835A - Vehicular body structure - Google Patents

Abstract

To provide a vehicular body structure capable of suppressing a reduction of sound insulation performance and of thermal insulation performance at a joint portion between an edge of a hollow double-wall panel and a joint mating member even though a core member is not filled in the joint mating member.SOLUTION: In the vehicular body structure 1, a hollow double-wall panel 5 is formed by continuously joining respective edges of two walls 51 and 52 and by filling a core member 53a in a closed space Sa between the two walls 51 and 52. The core member 53a is filled in the interior of an edge 55 of the hollow double-wall panel 5. With the edge 55 of the hollow double-wall panel 5 being joined with an upper surface 32a of a side sill 3, the core member 53a that is filled in the edge 55 of the hollow double-wall panel 5 covers the upper surface 32a of the side sill 3.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle body structure that connects a hollow double wall panel and a connection counterpart member.

  In the conventional vehicle body structure, the hollow double-walled panel forms a flange at the peripheral edge of each of the two walls, and the flanges of the respective walls are overlapped and joined together, and the respective walls In the closed space between, the core material having soundproofness and heat insulation is filled. Then, the hollow double-walled panel and the connection counterpart member are connected by connecting the above-mentioned mutually joined flange parts to the connection surface of the connection counterpart member (Patent Document 1).

JP 2001-242873 A

  In the conventional vehicle body structure, as described above, since the peripheral portion of the hollow double-walled panel is constituted by the above-mentioned mutually joined flanges, the core material is filled up to the inside of the peripheral portion of the hollow double-walled panel It was not done. For this reason, in the connection part of a hollow double wall panel and the other side connection part, there existed a fault to which sound insulation and heat insulation fall.

  Although this defect can be eliminated by filling the core material into the inside of the coupling partner member, this method has the disadvantage that the number of steps for filling the core member into the inside of the coupling partner member is increased.

  Therefore, in view of the above problems, the present invention is soundproof at the connection portion between the edge portion of the hollow double wall panel and the connection counterpart member even if the core member is not filled inside the connection counterpart member. An object of the present invention is to provide a vehicle body structure capable of suppressing a decrease in heat insulation.

  The present invention is a vehicle body structure in which an edge of a hollow double wall panel is connected to a connection surface of a connection counterpart member, and in the hollow double wall panel, peripheral portions of two wall portions are connected to each other. A closed space between two walls is filled with a core material, the core material is filled up to the inside of the edge of the hollow double-walled panel, and the edge of the hollow double-walled panel is In the vehicle body structure, the core material filled in the edge portion of the hollow double-walled panel covers the connection surface of the connection opposite member in a state of being connected to the connection surface of the connection opposite member.

  According to this configuration, the hollow double-walled panel is filled with the core material up to the inside of the edge of the hollow double-walled panel, and the edge of the hollow double-walled panel is connected to the connecting surface of the mating member Since the core material filled at the edge of the cover covers the connection surface of the connection partner member, the inside of the connection partner member is not filled with the core material, the edge of the hollow double wall panel and the connection partner member Soundproofness and heat insulation can be secured at the connecting portion with the connecting surface.

  As an aspect of the present invention, the connection counterpart member may be a frame member of a vehicle body or a hollow double wall panel having the same structure as the hollow double panel.

  According to this configuration, the hollow double-walled panel is connected to the frame member of the vehicle body or the hollow double-walled panel of the same structure (that is, various connection counterparts). It can be used suitably as a panel member of various parts.

Further, as an aspect of the present invention, the edge portion of the hollow double-walled panel and the connection surface of the connection opposite member may be connected by adhesion.
According to this configuration, since it is not necessary to open a hole for connection in the hollow double wall panel, the sealing property of the closed space inside the hollow double wall panel is secured, and the hollow double wall panel and the connection counterpart member And can be linked.

Further, as an aspect of the present invention, the edge of the hollow double-walled panel and the connection surface of the connection counterpart member may be connected by a fastening part.
According to this configuration, it is possible to mechanically connect the hollow double-walled panel and the connection counterpart member (that is, with sufficient connection strength).

  Further, as an aspect of the present invention, a through hole through which the fastening part is inserted is provided in the edge of the hollow double wall panel so as to penetrate in the thickness direction of the edge, and the hollow double wall panel When the ratio of the opening area of one opening of the through hole to the area of the one side main surface is an opening ratio, the opening ratio may be less than 1%.

  According to this configuration, the opening ratio of the through holes provided in the hollow double-walled panel is less than 1%, and therefore about 70% of the complete sealing of the hollow double-walled panel (that is, when the through holes are not provided). The above-mentioned soundproofness (i.e., practically sufficient soundproofness) can be secured, and a through hole can be provided in the hollow double-walled panel.

Further, as an aspect of the present invention, a gap between the edge of the hollow double-walled panel and the fastening component may be sealed with a sealing material.
According to this configuration, the gap between the edge of the hollow double-walled panel and the fastening component is sealed with the sealing material, so that the fastening component can be inserted into the edge of the hollow double-walled panel. Even if a through hole is provided, sufficient sealing of the closed space inside the hollow double-walled panel can be ensured.

  Further, as an aspect of the present invention, the thickness of the core layer formed by filling the core material in the closed space of the hollow double-walled panel is a value within the range of 7 mm to 50 mm. Good.

  According to this configuration, it is possible to achieve both the soundproofness and thickness reduction of the hollow double panel. In particular, when the thickness of the core layer of the hollow double-walled panel is 7 mm, the soundproofness of the hollow double-walled panel is secured to the minimum necessary performance within the practical range to maximize the hollow double-walled panel. Can be made as thin as possible. On the other hand, when the thickness of the core layer of the hollow double-walled panel is 50 mm, the soundproofness of the hollow double-walled panel is suppressed while the thickness of the hollow double-walled panel is suppressed to the maximum thickness within the practical range. It can be improved to the maximum.

Further, as an aspect of the present invention, the two wall portions are formed of at least one material of a thermosetting resin, a thermoplastic resin, aluminum, magnesium or iron, or the two wall portions are of the material The same material or a combination of different materials may be used.
According to this configuration, the strength of the hollow double-walled panel can be sufficiently secured. In the case of thermosetting resin, aluminum or magnesium, the hollow double-walled panel can be reduced in weight. Further, in the case of a thermosetting resin, aluminum or iron, the heat resistance of the hollow double panel can be sufficiently secured.

Further, as an aspect of the present invention, the two wall portions may be formed of members having different masses, and the mass difference ratio ΔM of the two wall portions may be within ± 10%.
According to this configuration, the soundproofness of the hollow double-walled panel can be made higher than that of the conventional panel.

Further, as an aspect of the present invention, the peripheral portions of the two wall portions may be bonded and connected to each other.
According to this configuration, it is possible to increase the degree of freedom of the shape and manufacturing method of the hollow double-walled panel.

Further, as an aspect of the present invention, the peripheral portions of the two wall portions may be integrally formed and connected to each other.
According to this configuration, it is possible to enhance the sealing performance at the peripheral portions of the two wall portions.

  Further, as an aspect of the present invention, the hollow double-walled panel has the edge and a panel main body other than the edge, and the edge protrudes horizontally outward with respect to the panel main body. It may have a horizontal part, and the field by the side of the thickness direction in the horizontal part may be connected with the connection side of the connection other member.

  According to this configuration, the horizontal portion is hooked on the connection surface of the connection partner member even if a load is applied to the hollow double-walled panel in the vertical direction (that is, the thickness direction of the horizontal portion). Thus, it is possible to prevent the disconnection between the hollow double wall panel and the connection counterpart member.

Also, as an aspect of the present invention, the horizontal portion of the edge of the hollow double-walled panel may be fastened to the connection surface with a fastening component.
According to this configuration, it is possible to mechanically connect the edge of the hollow double-walled panel to the connection surface of the connection counterpart member by using the horizontal part connected to the connection counterpart member.

  Further, as an aspect of the present invention, the hollow double-walled panel has the edge and a panel main body other than the edge, and the edge is a vertical portion projecting perpendicularly to the panel main body. The surface in the thickness direction in the vertical portion may be connected to the connection surface of the connection partner member.

  According to this configuration, the vertical portion is hooked on the connection surface of the connection counterpart even if a load is applied to the hollow double wall panel in the horizontal direction (that is, the thickness direction of the vertical portion) on the connection surface side. Thus, it is possible to prevent the disconnection between the hollow double wall panel and the connection counterpart member.

Also, as an aspect of the present invention, the vertical portion of the edge may be fastened to the connection surface with a fastening component.
According to this configuration, it is possible to mechanically fix the edge of the hollow double-walled panel to the connection counterpart by utilizing the vertical part that is connected to the connection counterpart. Moreover, it can prevent that the edge part of a fastening component protrudes in the thickness direction of a panel main body, As a result, while being able to suppress that a fastening component is hooked from the outside can be made inconspicuous from the outside.

  As an aspect of the present invention, the hollow double-walled panel has the edge and a panel body other than the edge, and the edge is inclined to one side in the thickness direction of the panel body. The surface on the side in the thickness direction in the inclined portion may be connected to the connection surface of the connection partner member.

  According to this configuration, it is possible to receive the load evenly over the entire surface on the side in the thickness direction in the inclined portion (i.e., the connection surface with the connection partner member). As a result, it is possible to suppress concentration of load on a part of the connection surface of the inclined portion with the connection counterpart member (for example, the base end of the edge of the hollow double-walled panel).

Further, as an aspect of the present invention, the inclined portion of the edge may be fastened to the connection surface by a fastening part.
According to this configuration, it is possible to mechanically fix the edge portion of the hollow double-walled panel to the connection opposite member by utilizing the inclined portion connected to the connection opposite member.

  According to this aspect of the invention, even if the core member is not filled inside the connection counterpart member, the soundproofness and the heat insulation are reduced at the connection portion between the edge of the hollow double wall panel and the connection counterpart member. To provide a vehicle body structure that can be suppressed.

Sectional drawing which shows the vehicle body structure which concerns on this embodiment. FIG. 2 is a cross-sectional view of the hollow double-walled panel of FIG. 1; The enlarged view which shows the one side half of FIG. The figure which shows the relationship between thickness D of the core layer of a hollow double walled panel, and the sound volume transmission loss ratio K. FIG. (A) is sectional drawing in the case of fastening a horizontal part and a connection other-part member by fastening components, (b) is the elements on larger scale of (a), (c) is sectional drawing which shows the modification of (b). The top view which looked at the hollow double walled panel from the upper side. The figure which shows the relationship of the sound insulation performance holding ratio T of a hollow double wall panel, and the aperture ratio Y. FIG. Sectional drawing in case the connection part of a hollow double wall panel has a perpendicular | vertical part and a horizontal part. Sectional drawing in the case of fastening the perpendicular | vertical part of a hollow double wall panel, and a connection opposite member by fastening components. Sectional drawing in case the connection part of a hollow double wall panel has an inclination part. Sectional drawing in the case of fastening the inclination part of a hollow double wall panel, and a connection other member by fastening components. (A) is sectional drawing which shows the hollow double wall panel when two wall parts are divided and comprised, (b) is the elements on larger scale of (a). The figure which shows the relationship between the sound insulation volume Q of the hollow double wall panel, and the noise frequency F. FIG. Sectional drawing in the case of connecting hollow double wall panels.

Embodiment
A vehicle body structure 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.
The vehicle body structure 1 is applicable to a panel constituting a vehicle body such as an automobile, and in particular to a panel member (for example, a roof panel, a door panel, a dash panel, a floor panel, etc.) partitioning a compartment. In the following description, as an example, the case where the vehicle body structure 1 is applied to a floor panel constituting a floor portion FL of a cabin will be described as an example.

  As shown in FIG. 1, the vehicle body structure 1 is provided with left and right side sills (connection counterpart members, frame members) 3, a center tunnel portion (connection counterpart members) 4, and left and right hollow double wall panels 5. .

  The left and right side sills 3 are made of metal, for example, and are framework members that constitute the left and right ends of the floor portion FL of the vehicle compartment, and support the outer end of the hollow double-walled panel 5 in the vehicle width direction. The left and right side sills 3 are disposed at the left and right ends of the floor FL of the passenger compartment, are hollow inside, extend in the longitudinal direction of the vehicle body, and are formed in symmetrical shapes relative to each other.

  The cross-sectional shape of the side sill 3 (that is, the cross-sectional shape of the cross section orthogonal to the vehicle longitudinal direction) is, for example, substantially L-shaped, and for example, the vertical wall 31 having a rectangular cross section and the width of the vehicle And a projection 32 having, for example, a rectangular cross section, which protrudes inward in the direction. The protrusion 32 is a portion connected to the hollow double wall panel. Hereinafter, the connecting portion 32 is also described.

  The internal space of the side sill 3 is partitioned by a partition provided inside the side sill 3 into a plurality of (for example, three) closed spaces Sp, Sq, Sr. Each closed space Sp, Sq, Sr is divided, for example, to align vertically.

  The cross-sectional shape (that is, the cross-sectional shape of the cross section orthogonal to the vehicle longitudinal direction) of the lowermost closed space Sp is formed in a rectangular shape wider in the vehicle width direction including the lower portion of the vertical wall portion 31 and the entire projecting portion 32 ing. The cross-sectional shapes of the topmost closed space Sr and the middle closed space Sq (that is, the cross-sectional shape of the cross section orthogonal to the longitudinal direction of the vehicle body) are respectively the upper portion of the vertical wall portion 31 (i.e., other than the lower portion of the vertical wall portion 31). The part is formed in the shape of being divided into upper and lower parts, and is formed in the same width as each other and in a rectangular shape narrower than the lowermost closed space Sr.

  The center tunnel portion 4 is formed of, for example, metal, and transmits an exhaust pipe (not shown) through which exhaust gas from an engine (not shown) mounted in the engine room of the vehicle body flows, or the power of the engine to the rear wheel of the vehicle body A propeller shaft (not shown) or the like to be inserted is a portion through which the inner end portion of the hollow double-walled panel 5 in the vehicle width direction is supported. The center tunnel portion 4 is disposed at the center of the floor portion FL of the cabin and extends in the longitudinal direction of the vehicle body. The cross-sectional shape of the center tunnel portion 4 (that is, the cross-sectional shape of the cross section orthogonal to the longitudinal direction of the vehicle body) is formed in, for example, a substantially trapezoidal hollow shape and protrudes above the floor FL of the vehicle cabin.

  The center tunnel unit 4 includes a tunnel main body 41 and a tunnel cover 42. The tunnel body 41 extends in the longitudinal direction of the vehicle body. The cross-sectional shape of the tunnel main body 41 (that is, the cross-sectional shape of the cross section orthogonal to the longitudinal direction of the vehicle body) is substantially U-shaped with the lower surface open, and includes a ceiling 411 and left and right side walls 412.

  The ceiling portion 411 is formed, for example, in a flat plate shape. The left and right side wall portions 412 are extended downward from the left and right end portions of the ceiling portion 411. The space between the left and right side wall portions 412 is, for example, opened outward in the vehicle width direction as it extends downward. A connecting portion 413 for connecting to the hollow double-walled panel 5 is provided on the main surface on the outer side in the vehicle width direction among the main surfaces on both sides of the side wall portion 412.

  The connecting portion 413 protrudes outward in the vehicle width direction from the lower portion of the main surface of the side wall portion 412 in the vehicle width direction, and extends in the vehicle longitudinal direction. The cross-sectional shape (that is, the cross-sectional shape of the cross section orthogonal to the vehicle longitudinal direction) of the connecting portion 413 is formed, for example, in a substantially rectangular shape, and the inside is hollow, for example. The height of the upper surface of each connecting portion 413 is the same height as the upper surface of the connecting portion 32 of the opposing side sill 3 in order to support the hollow double-walled panel 5 in parallel.

  The tunnel cover 42 closes the open lower surface of the tunnel main body 41, and is formed in a vertically long flat plate shape extending in the longitudinal direction of the vehicle body. The tunnel cover 42 is disposed on the open lower surface of the tunnel main body 41 and is fixed to the tunnel main body 41 by fastening parts (not shown) such as bolts.

  As shown in FIGS. 1 and 2, in the hollow double-walled panel 5, the peripheral portions of the two wall portions 51 and 52 are connected, and a closed space Sa between the two wall portions 51 and 52 is provided. The core layer 53 is formed and configured. Each of the wall portions 51 and 52 is made of, for example, a resin (for example, a thermosetting resin, specifically, a polyester resin or the like, or a thermoplastic resin, specifically, polypropylene, or the like). The hollow double-walled panel 5 is generally formed in a plate shape, and the peripheral portions of the two wall portions 51 and 52 are connected to each other, for example, at the peripheral portion of the hollow double-walled panel.

  Further, the peripheral edge portions of the two wall portions 51 and 52 are integrally molded and connected to each other. As a method of integrally forming the peripheral portions of the two wall portions 51 and 52 integrally and connecting them, for example, a molten resin which is a material of the wall portions 51 and 52 is sprayed into a mold for the hollow double wall panel 5 Thus, so-called blow molding, in which the two wall portions 51 and 52 are integrally formed, can be used.

  The core layer 53 is formed by filling the core material 53a in the closed space Sa of the hollow double-walled panel 5, and has at least one performance (both in this embodiment) of sound insulation and heat insulation. There is. The core material 53a is formed of, for example, a material having a fibrous or open cell structure, and is configured by mixing a solid phase and a gas phase. As the gas phase, for example, a gas excellent in simple compressibility such as air or SF6 (sulfur hexafluoride) gas, or various gases such as xenon gas or krypton gas are used. In addition, negative pressure or vacuum may be applied as the gas phase.

  As shown in FIG. 2, the hollow double-walled panel 5 is formed, for example, in a flat plate shape, and includes a panel main body 54 and an edge 55 which is a portion other than the panel main body 54. The edge 55 functions as a connecting portion for connecting with the connection counterpart member (for example, the side sill 3 and the center tunnel portion 4). Hereinafter, the connecting portion 55 is also described. The closed space Sa inside the hollow double wall panel 5 is integrally formed from the inside of the panel body 54 to the inside of the edge 55, and the core layer 53 is from the inside of the panel body 54 to the inside of the edge 55 Are integrally formed. That is, the core material 53 a is filled from the inside of the panel main body 54 to the inside of the edge 55.

  The panel main body 54 is formed, for example, in a flat plate shape. The connecting portion 55 is formed of a flat plate-like horizontal portion 55H which protrudes outward in the horizontal direction with respect to the panel main body 54 from the end portions on both sides in the vehicle width direction of the panel main body 54. The horizontal portion 55 </ b> H is provided in a stepped manner in the thickness direction of the panel main body 54 from the lower main surface of the panel main body 54.

  In this embodiment, the connecting portions 55 of the hollow double-walled panel 5 are provided only on both sides in the vehicle width direction of the panel main body 54 and not on both sides in the vehicle longitudinal direction. It may be provided on both sides.

  The sound absorbing layer W1 and the skin layer W2 are provided in order from the lower side on the upper surface (that is, the upper surface of the upper wall portion 51) of the hollow double-walled panel 5 configured as described above. The sound absorbing layer W1 is formed of a material that absorbs sound (for example, felt, urethane foam, etc.). The surface layer W2 protects the surface of the hollow double-walled panel 5 and improves its appearance, and is made of, for example, synthetic fibers or rubber.

  As shown in FIG. 3, the hollow double-walled panel 5 configured in this way is connected between the side sill 3 and the center tunnel portion 4 from the upper side. In this connection state, the lower surface (that is, the lower surface in the thickness direction of the horizontal portion 55H) 55a of the connection portion 55 on the outer side in the vehicle width direction of the hollow double wall panel 5 is the upper surface (that is, connection) of the connection portion 32 of the side sill 3. The core material 53 a in the connecting portion 55 covers the upper surface 32 a of the side sill 3. Further, the side surface 55c on the outer side in the vehicle width direction of the connecting portion 55 is adjacent to the side surface 31a on the inner side in the vehicle width direction of the vertical wall 31 of the side sill 3, and the side surface 54a on the outer side in the vehicle width direction of the panel main body 54 is the side sill 3 It is adjacent to the side surface 32 b on the inner side in the vehicle width direction of the connecting portion 32 of FIG.

  Similarly, the lower surface 55a of the connecting portion 55 on the inner side in the vehicle width direction of the hollow double-walled panel 5 is superimposed on the upper surface (that is, connecting surface 413a) of the connecting portion 413 of the center tunnel portion 4 The layer 53 (i.e., the core 53 a) covers the top surface 413 a of the center tunnel portion 4. Further, the side surface 55c on the outer side in the vehicle width direction of the connection portion 55 is adjacent to the side surface 412a on the outer side in the vehicle width direction of the side wall portion 412 of the center tunnel portion 4, and the side surface 54a on the inner side in the vehicle width direction of the panel main body 54 is the center. Adjacent to a side surface 413 a on the outer side in the vehicle width direction of the connecting portion 413 of the tunnel portion 4.

  Thus, the upper surface (i.e., connection surface) 32a of the side sill 3 and the upper surface (i.e., connection surface) 413a of the center tunnel portion 4 are covered by the core material 53a inside the connection portion 55 on both sides of the hollow double-walled panel 5. Thus, the soundproofness and heat insulation of the connection between the hollow double-walled panel 5 and the side sill 3 and the center tunnel portion 4 are ensured.

  In the above connection state, the gap between the hollow double-walled panel 5 and the side sill 3 (ie, the gap between the surfaces 31a and 55c, the gap between the surfaces 32a and 55a, and the gap between the surfaces 32b and 54a) Adhesive F is applied. In addition, an adhesive is applied to the gap between the hollow double-walled panel 5 and the center tunnel portion 4 (ie, the gap between the surfaces 412a and 55c, the gap between the surfaces 413a and 55a, and the gap between the surfaces 413b and 54a). F is applied. The hollow double wall panel 5, the side sill 3 and the center tunnel portion 4 are connected to each other by the adhesive F.

  FIG. 4 is a view showing the relationship between the thickness D [mm] of the core layer 53 and the soundproof performance of the hollow double-walled panel 5 (for example, the sound volume transmission loss ratio K [%]). The sound volume transmission loss ratio K is the ratio of the sound volume transmitted through the hollow double-walled panel 5, and the ratio K at a thickness D of 0 mm of the core layer 53 is 100%. As the volume transmission loss ratio K increases, the soundproofing performance of the hollow double-walled panel 5 improves.

  As can be seen from FIG. 4, the sound volume transmission loss ratio K increases substantially in the same manner when the thickness D of the core layer 53 is 30 mm or more. Further, the volume transmission loss ratio K is a decrease that is less than 25% from the volume transmission loss ratio K at a thickness D of 30 mm of the core layer 53 when the thickness D of the core layer 53 is 15 mm or more. Will be held by In addition, the volume transmission loss ratio K tends to decrease when the thickness D of the core layer 53 is 15 mm or less.

  In consideration of the above-described consideration shown in FIG. 4 and the fact that the thinner the core layer 53 is, the thinner the hollow double-walled panel 5 becomes and the securing of the arrangement space becomes easy, the thickness D of the core layer 53 is 15 mm or more It is desirable that it is 30 mm or less. In the case where the soundproofness of the hollow double wall panel 5 is further emphasized, the thickness D of the core layer 53 may be increased to 50 mm, and in the case where the thickness reduction of the hollow double wall panel 5 is further emphasized. The thickness D of the core layer 53 may be as thin as 15 mm.

<Major effects>
As mentioned above, according to the vehicle body structure 1 which concerns on this embodiment, the edge 55 of the hollow double wall panel 5 is a connection surface of a connection other member (for example, the connection surface 32a of the side sill 3 and the connection surface 413a of the center tunnel part 4). The hollow double-walled panel 5 has a core member 53a in the closed space Sa between the two wall portions 51 and 52, in which the peripheral portions of the two wall portions 51 and 52 are connected. The core material 53a is filled up to the inside of the edge 55 of the hollow double-walled panel 5, and the edge 55 of the hollow double-walled panel 5 is connected to the connecting surface of the above-mentioned connecting counterpart member. Then, the core material 53a filled in the edge 55 of the hollow double-walled panel 5 covers the connection surface of the above-mentioned connection counterpart member.

  According to this configuration, the core material 53a is filled up to the inside of the edge 55 of the hollow double-walled panel 5, and the edge 55 of the hollow double-walled panel 5 is connected to the connection surface of the connection counterpart member. The core material 53a filled in the edge 55 of the hollow double-walled panel 5 covers the connection surface of the connection partner member, so that the core member is not filled inside the connection partner member. The soundproofness and the heat insulation can be secured in the connection portion between the edge 55 of the hollow double wall panel 5 and the connection surface of the connection counterpart member.

  Further, since the connection counterpart member of the hollow double wall panel 5 is the frame member (for example, side sill 3) of the vehicle body and the reinforcing member for the vehicle body (for example, the center tunnel portion 4), the hollow double wall panel 5 is used as a casing of the vehicle body. It can be suitably used as a floor panel of

  In addition, since the edge (that is, the connection portion) 55 of the hollow double-walled panel 5 and the connection surfaces 32a and 413a of the side sill 3 and the center tunnel portion 4 which are connection counterpart members are connected by adhesion, they are hollow. There is no need to open holes in the double wall panel 5 for connection. For this reason, the airtightness of closed space Sa inside hollow double wall panel 5 is secured, and hollow double wall panel 5 and a connecting partner member can be connected.

  In addition, since the thickness of the core layer 53 formed by filling the core material 53a in the closed space Sa of the hollow double-walled panel 5 is a value within the range of 7 mm to 50 mm, the hollow double-walled panel Both soundproofing and thinning can be achieved. In particular, in the case where the thickness of the core layer 53 of the hollow double-walled panel 5 is 7 mm, the soundproofness of the hollow double-walled panel 5 is secured to the minimum necessary performance within the practical range. The panel 5 can be made thin as much as possible. On the other hand, in the case where the thickness of the core layer 53 of the hollow double-walled panel 5 is 50 mm, the hollow double-walled panel 5 is limited while suppressing the thickness of the hollow double-walled panel 5 to the maximum thickness within the practical range. Soundproofness can be maximized.

  Further, since the two wall portions 51 and 52 are formed of, for example, a thermosetting resin or a thermoplastic resin, the heat resistance of the hollow double wall panel 5 is ensured while the strength of the hollow double wall panel 5 is sufficiently secured. Can be improved as compared to general purpose resins, and the hollow double-walled panel 5 can be reduced in weight.

As the material of the two wall portions 51 and 52, aluminum, magnesium or iron may be used instead of the thermosetting resin or the thermoplastic resin. Even when using these materials, the strength of the hollow double-walled panel 5 can be sufficiently secured. Moreover, when using aluminum or magnesium, the hollow double wall panel 5 can be reduced in weight. When aluminum or iron is used, the heat resistance of the hollow double panel can be sufficiently secured.
The two wall portions 51 and 52 are formed of at least one material of a thermosetting resin, a thermoplastic resin, aluminum, magnesium or iron, or the two wall portions 51 and 52 are ones of the materials described above. It may be formed of the same material or a combination of different materials.

  Further, since the peripheral portions of the two wall portions 51 and 52 are integrally formed and connected to each other, sealing performance at the peripheral portions of the two wall portions 51 and 52 can be enhanced.

  In addition, the hollow double-walled panel 5 has an edge (i.e., connection portion) 55 and a panel main body 54 other than the edge 55, and the edge 55 protrudes outward in the horizontal direction with respect to the panel main body 54 Since the horizontal surface 55a having the horizontal portion 55H in the thickness direction in the horizontal portion 55H is connected to the connection surface of the connection counterpart member (for example, the connection surface 32a of the side sill 3 or the connection surface 413a of the center tunnel portion 4), Even if a load is applied to the connecting surface side in the vertical direction (that is, in the thickness direction of the horizontal portion 55H) with respect to the hollow double-walled panel 5, the horizontal portion 55H is hooked on the connecting surface of the connecting counterpart member. It is possible to prevent the connection between the heavy wall panel 5 and the connection counterpart member from being disconnected.

  In this embodiment, the horizontal portion 55H is thinner than the panel main body 54, and is recessed in the thickness direction of the panel main body 54 with respect to the lower surface of the panel main body 54. The same thickness may be provided flush with the upper and lower surfaces of the panel main body 54 without steps.

<Modification 1>
As shown in FIG. 5 (a), this modification 1 mechanically connects the hollow double wall panel 5 and the connection counterpart member with the fastening part 6 (bolt 6a and nut 6b) in the above embodiment. It is a thing.

  More specifically, in the first modification, the horizontal portion 55H of the edge 55 of the hollow double-walled panel 5 is provided with a through hole 55b. The through hole 55b is provided to penetrate the horizontal portion 55H in the thickness direction of the horizontal portion 55H. A through hole 32 s is provided in the connection surface 32 a of the side sill 3 (i.e., the upper wall portion of the connection portion 32). A nut 6 b is fixed to the back side of the connection surface 32 a of the side sill 3 (that is, the back surface of the upper wall portion of the connection portion 32). The screw hole of the nut 6 b and the through hole 32 s communicate with each other.

  The bolt 6a is threaded through the through hole 55b of the horizontal portion 55H of the hollow double wall panel 5 and the through hole 32s of the connecting surface 32a of the side sill 3 in order and screwed into the nut 6b. By this screwing, the hollow double-walled panel 5 and the connection counterpart member (for example, the side sill 3) are mechanically connected by the fastening part 6.

  As shown in FIG. 5B, the gap between the head 6c of the bolt 6a and the upper surface of the horizontal portion 55H (ie, the upper surface of the edge 55) is sealed around the head 6c of the bolt 6a. Thus, the sealing material G is provided. With the sealing material G, the sealing performance of the closed space Sa inside the hollow double-walled panel 5 is sufficiently ensured. As shown in FIG. 5C, instead of providing the sealing material G around the head 6c of the bolt 6a, the through hole 55b in the back surface of the head 6c of the bolt 6a and the upper surface of the horizontal portion 55H It may be provided between the peripheral portion.

  As shown in FIG. 5 (a), an adhesive F is applied to the connecting portion between the hollow double-walled panel 5 and the connection counterpart member (for example, the side sill 3) as in the above embodiment. . The hollow double wall panel 5 and the connection counterpart member are also connected by the adhesive F. As a result, the adhesive F seals the gap between the through hole 55 b and the bolt 6 a on the lower surface (that is, connecting surface) 55 a of the edge 55 of the hollow double-walled panel 5. Also by this, the sealing performance of the closed space Sa inside the hollow double-walled panel 5 is sufficiently ensured.

  As described above, according to the first modification, the edge 55 of the hollow double-walled panel 5 and the connection surface of the connection counterpart member (for example, the connection surface 32 a of the side sill 3) are connected by the fastening component 6. The double wall panel 5 and the mating member can be mechanically coupled (ie, with sufficient coupling strength).

  In addition, since the horizontal portion 55H of the edge 55 of the hollow double-walled panel 5 is fastened to the connection surface of the connection counterpart member by the fastening part 6, the hollow portion is hollowed using the horizontal portion 55H connected to the connection counterpart member. The edge 55 of the heavy wall panel 5 can be mechanically connected to the connection surface of the connection counterpart member.

  In addition, since the gap between the edge 55 of the hollow double-walled panel 5 (for example, the upper surface of the edge 55) and the fastening component 6 (for example, the head 6c of the bolt 6a) is sealed with the sealing material G, Even when the edge 55 of the hollow double wall panel 5 is provided with the through hole 55 b for inserting the fastening part 6, the sealing property of the closed space Sa inside the hollow double wall panel 5 can be ensured. .

  In the first modification, the connection between the hollow double-walled panel 5 and the side sill 3 is described as an example, but the connection between the hollow double-walled panel 5 and the center tunnel portion 4 is also the fastening component 6 in the same manner. It may be linked.

  In this embodiment, the adhesive F in the gap between the hollow double wall panel 5 and the side sill 3 may be omitted.

<Modification 2>
In the second modification, in the first modification, the relationship between the through hole 55b of the edge 55 of the hollow double wall panel 5 and the surface area of the hollow double wall panel 5 is set as follows. That is, as shown in FIG. 6, the opening at one side (ie, the same side as one main surface 5U) of through hole 55b with respect to area S1 of one main surface (for example, upper main surface) 5U of hollow double wall panel 5 The opening ratio Y is set to less than 1%, assuming that the ratio of the opening area S2 is the opening ratio Y (= (S2 × 100) / S1).

  When a plurality of through holes 55b are provided at the edge 55 of the hollow double-walled panel 5, the opening area S2 of the through holes 55b is the entire opening area of one side of the plurality of through holes 55b. It is the added value.

  The openings of the through holes 55b are formed in both the front main surface (i.e., the upper main surface 5U) and the rear main surface (i.e., the lower main surface 5D) of the hollow double-walled panel 5. Therefore, the area of the entire surface of the hollow double wall panel 5 (that is, the sum of the areas of the upper main surface 5U and the lower main surface 5D) is S4, and the through hole 55b provided in the hollow double wall panel 5 is Assuming that the sum of the opening areas of the openings at both ends is S3, the above definition of the opening ratio Y can be restated as Y = (S3 × 100) / S4. Also in this case, when a plurality of through holes 55b are provided, the opening area S5 is the sum of the opening areas of the openings at both ends of all the through holes 55b.

  FIG. 7 is a view showing the relationship between the sound insulation performance holding ratio T [%] of the hollow double wall panel 5 and the opening ratio Y [%]. The sound insulation performance holding ratio T indicates how much the sound insulation performance of the hollow double-walled panel 5 is held. The sound insulation performance retention ratio T is 100% at the aperture ratio Y = 0% (that is, when there is no through hole 55b in the hollow double wall panel 5), and becomes 0% at the aperture ratio Y = 100%. As can be seen from FIG. 7, when the aperture ratio Y is from 0% to 1%, the sound insulation performance retention ratio T decreases by about 30%. For this reason, in order to keep the sound insulation performance holding ratio T at a high value, it is desirable that the aperture ratio Y be set to less than 1% as described above.

  As described above, according to the second modification, since the opening ratio Y of the through hole 55b provided in the hollow double wall panel 5 is less than 1%, the hollow double wall panel 5 is completely sealed (that is, the through hole 55b is provided). The through-hole 55b can be provided in the hollow double-walled panel 5 while ensuring soundproofness (that is, soundproofness practically sufficient) of about 70% or more with respect to the case where there is no).

<Modification 3>
In the above embodiment, the connection portion (i.e., the edge portion) 55 of the hollow double-walled panel 5 is constituted only by the horizontal portion 55H, but as shown in FIG. The connecting portion (or edge) 55 of the panel 5 is composed of a horizontal portion 55H and a vertical portion 55V. The vertical portion 55V is provided in a plate shape so as to project vertically upward with respect to the panel main body 54 from an end portion in the vehicle width direction of the panel main body 54 of the hollow double wall panel 5. The horizontal portion 55H is provided in a plate shape so as to protrude outward in the horizontal direction with respect to the panel main body 54 from the upper end portion of the vertical portion 55V.

  In the third modification, the horizontal portion 55H recedes in a step-like manner above the lower surface 54D of the panel main body 54 in the thickness direction of the panel main body 54. Further, the panel main body 54 is recessed stepwise downward in the thickness direction of the horizontal portion 55H with respect to the upper surface 55i of the horizontal portion 55H, and the thickness of the panel main body 54 is, for example, the panel in the above embodiment. It is thinner than the thickness of the main body 54.

  As shown in FIG. 8, in the connected state of the hollow double wall panel 5 and the connection counterpart member (for example, the side sill 3) in the third modification, the lower surface (i.e., the horizontal portion) of the horizontal portion 55H of the hollow double wall panel 5 The lower surface 55H in the thickness direction 55H is superimposed on the upper surface (that is, connecting surface) 32a of the connecting portion 32 of the side sill 3, and the core material 53a in the horizontal portion 55H covers the upper surface 32a of the side sill 3. Further, the side surface of the vertical portion 55V of the hollow double-walled panel 5 at the outer side in the vehicle width direction (that is, the outer surface in the thickness direction of the vertical portion 55V) 55d is the inner side surface at the vehicle width direction of the connecting portion 32 of the side sill The core material 53a in the vertical portion 55V covers the side surface 32b of the side sill 3 so as to overlap the connecting surface 32b. Further, the side surface 55 c on the outer side in the vehicle width direction of the horizontal portion 55 H of the hollow double-walled panel is adjacent to the side surface 31 a on the inner side in the vehicle width direction of the vertical wall portion 31 of the side sill 3.

  As described above, the connecting surfaces 32 a and 32 b of the side sill 3 are covered with the core material 53 a inside the connecting portion 55 of the hollow double wall panel 5, so that the connecting portion between the hollow double wall panel 5 and the side sill 3 is Sound insulation and heat insulation are secured.

  In the above connection state, the gap between the hollow double-walled panel 5 and the side sill 3 (ie, the gap between the surfaces 31a and 55c, the gap between the surfaces 32a and 55a, and the gap between the surfaces 32b and 55d) Adhesive F is applied. The hollow double-walled panel 5, the side sill 3 and the center tunnel portion 4 are connected to each other by the adhesive F.

  In the above description, although the connecting portion on the outer side in the vehicle width direction of hollow double wall panel 5 (that is, the connecting portion connected to side sill 3) 55 has been described, the inner side in the vehicle width direction of hollow double wall panel 5 The connection portion (that is, the connection portion connected to the center tunnel portion 4) 55 is also formed in the same manner as described above, and is connected to the center tunnel portion 4 in the same manner as described above.

  As described above, according to the third modification, the connection portion (i.e., the edge portion) 55 of the hollow double-walled panel 5 has the vertical portion 55V protruding perpendicularly to the panel main body 54, and the thickness at the vertical portion 55V. In the horizontal direction (i.e., in the thickness direction of the vertical portion 55V) with respect to the hollow double-walled panel 5, since the outer surface 55d of the direction is connected to the connection surface of the connection counterpart member (for example, Even when a load is applied to the connection surface side, the vertical portion 55V is caught on the connection surface of the connection counterpart member, so that disconnection of the hollow double wall panel 5 and the connection counterpart member can be prevented.

  In the third modification, the connection portion (i.e., the edge portion) 55 of the hollow double-walled panel 5 is described as having the vertical portion 55V and the horizontal portion 55H. However, the vertical portion of the vertical portion 55V and the horizontal portion 55H is described. Only 55 V may be provided.

<Modification 4>
As shown in FIG. 9, in the modification 4 described above, the hollow double-walled panel 5 and the side sill 3 (connection counterpart member) are mechanically coupled with the fastening part 7 (bolt 7 a and nut 7 b) in the above modification 3 It is connected.

  More specifically, in the fourth modification, a through hole 55 e is provided in the vertical portion 55 V of the connection portion (i.e., the edge portion) 55 of the hollow double-walled panel 5. The through hole 55e is provided to penetrate the vertical portion 55V in the thickness direction of the vertical portion 55V. A through hole 32 t is provided on the side surface (that is, connecting surface) 32 b of the connecting portion 32 of the side sill 3. A nut 7 b is fixed to the back side of the connection surface 32 b of the side sill 3 (i.e., the back surface of the side wall portion of the connection portion 32). The screw hole of the nut 7b and the through hole 32t communicate with each other.

  The bolt 7a is threaded through the through hole 55e of the vertical portion 55V of the hollow double wall panel 5 and the through hole 32t of the side surface 32b of the side sill 3 in order and screwed into the nut 7b. By this screwing, the hollow double wall panel 5 and the connection counterpart member (for example, the side sill 3) are mechanically connected by the fastening part 7.

  A sealant G is provided around the head 7c of the bolt 7a (ie, the fastening part 7) so as to seal the gap between the head of the bolt 7a and the vertical portion 55V (ie, the edge 55). It is done. With the sealing material G, the sealing performance of the closed space Sa inside the hollow double-walled panel 5 is sufficiently ensured.

  In addition, the adhesive material F is apply | coated to the connection part between the hollow double wall panel 5 and a connection other member (for example, side sill 3) like said modification 3. FIG. The hollow double wall panel 5 and the connection counterpart member are also connected by the adhesive F. As a result, the adhesive F seals the gap between the through hole 55 e and the bolt 7 a on the side surface (that is, connecting surface) 55 d of the vertical portion 55 V of the hollow double-walled panel 5. Also by this, the sealing performance of the closed space Sa inside the hollow double-walled panel 5 is sufficiently ensured.

As described above, according to the fourth modification, the vertical portion 55V of the connection portion (i.e., the edge portion) 55 of the hollow double-walled panel 5 is formed on the connection surface (e.g., the side surface 32b of the side sill 3) with the fastening component 7 Since the fastening is performed, the connecting portion 55 of the hollow double-walled panel 5 can be mechanically fixed to the connecting counterpart member by using the vertical portion 55V that is connected to the connecting mating member.
In addition, the end of the fastening part 7 can be prevented from protruding in the thickness direction of the panel main body 54. As a result, the fastening part 7 can be prevented from being caught from the outside and can be made inconspicuous from the outside.

<Modification 5>
In the above embodiment, the connection portion (i.e., the edge portion) 55 of the hollow double-walled panel 5 is formed of the horizontal portion 55H. However, as shown in FIG. The connection portion 55 of 5 is formed by the inclined portion 55U. The inclined portion 55U is provided so as to protrude outward in the vehicle width direction with respect to the panel body 54 from the end in the vehicle width direction of the panel body 54 of the hollow double-walled panel 5 and project in a plate shape upward in the vertical direction. ing. The side surface 55f on the outer side in the vehicle width direction in the inclined portion 55U is formed perpendicularly to the panel main body 54.

  In the fifth modification, the connecting portion 32 of the side sill 3 protrudes inward in the vehicle width direction from the lower portion of the vertical wall portion 31, and the upper surface 32a of the connecting portion 32 is inclined parallel to the inclination direction of the inclined portion 55U. There is. That is, the upper surface 32a is inclined downward toward the inside in the vehicle width direction.

  As shown in FIG. 10, in the connected state of the hollow double wall panel 5 and the connection counterpart member (for example, the side sill 3) in the fifth modification, the lower surface of the inclined portion 55U of the hollow double wall panel 5 (ie, the inclined portion The lower surface of 55U in the thickness direction, ie, the connecting surface with the connection partner member) 55h is superimposed on the upper surface (i.e. connecting surface) 32a of the connecting portion 32 of the side sill 3, and the core 53a in the inclined portion 55U is a side sill The upper surface 32a of 3 is covered. Further, the side surface 55 f of the inclined portion 55 U of the hollow double-walled panel 5 is adjacent to the side surface 31 a on the inner side in the vehicle width direction of the vertical wall portion 31 of the side sill 3.

  Thus, by covering the connecting surface 32 a of the side sill 3 with the core material 53 a inside the connecting portion 55 of the hollow double wall panel 5, the soundproofing at the connecting portion between the hollow double wall panel 5 and the side sill 3 And heat insulation are secured.

  In the above connection state, the adhesive F is applied to the gap between the hollow double wall panel 5 and the side sill 3 (that is, the gap between the surfaces 31a and 55f and the gap between the surfaces 32a and 55h). . The hollow double-walled panel 5, the side sill 3 and the center tunnel portion 4 are connected to each other by the adhesive F.

  In the above description, although the connecting portion on the outer side in the vehicle width direction of hollow double wall panel 5 (that is, the connecting portion connected to side sill 3) 55 has been described, the inner side in the vehicle width direction of hollow double wall panel 5 The connection portion (that is, the connection portion connected to the center tunnel portion 4) 55 is also formed in the same manner as described above, and is connected to the center tunnel portion 4 in the same manner as described above.

  As described above, according to the fifth modification, the connection portion (that is, the edge portion) 55 of the hollow double-walled panel has the inclined portion 55U inclined on one side (for example, the upper side) in the thickness direction of the panel main body 54 Since the lower surface (that is, connecting surface) 55h on the side in the thickness direction of inclined portion 55U is connected to the connecting surface of the connection partner member (for example, connecting surface 32a of the side sill), the above-mentioned thickness side A load can be evenly received over the entire lower surface (i.e., the connecting surface with the mating member). As a result, it is possible to suppress the concentration of the load on a part of the connection surface of the inclined portion 55U with the connection counterpart member (for example, the base end of the edge 55 of the hollow double-walled panel 5).

  Further, the lower surface 55h of the inclined portion 55U in the thickness direction is connected to the connection surface of the connection counterpart member (for example, the connection surface 32a of the side sill 3). Even when a pressing load is applied from the upper side in the vertical direction, the inclined portion 55U is hooked on the connection surface of the connection counterpart member, so that disconnection of the hollow double wall panel 5 and the connection counterpart member can be prevented.

<Modification 6>
As shown in FIG. 11, in this modification 6, in the above modification 5, the hollow double-walled panel 5 and the side sill 3 (connection counterpart member) are mechanically coupled with the fastening part 8 (bolt 8a and nut 8b). It is connected.

  More specifically, in the sixth modification, the inclined portion 55U of the hollow double-walled panel 5 is provided with a through hole 55k. The through hole 55k is provided to penetrate the inclined portion 55U in the thickness direction of the inclined portion 55U. A through hole 32 u is provided on the upper surface (i.e., connecting surface) 32 a of the connecting portion 32 of the side sill 3. A nut 8 b is fixed to the back side of the connection surface 32 a of the side sill 3 (that is, the back surface of the upper wall portion of the connection portion 32). The screw hole of the nut 8b and the through hole 32u communicate with each other.

  The bolt 8a is threaded through the through hole 55k of the inclined portion 55U of the hollow double-walled panel 5 and the through hole 32u of the upper surface 32a of the side sill 3 in order and screwed onto the nut 8b. By this screwing, the hollow double wall panel 5 and the connection counterpart member (for example, the side sill 3) are mechanically connected by the fastening part 8.

The sealant G is provided around the head 8c of the bolt 8a (i.e., the fastening part 8) so as to seal the gap between the head 8c of the bolt 8a and the inclined portion 55U (i.e., the edge 55). It is provided. With the sealing material G, the sealing performance of the closed space Sa inside the hollow double-walled panel 5 is sufficiently ensured.
An adhesive F is applied to the connection portion between the hollow double-walled panel 5 and the connection counterpart member (for example, the side sill 3) as in the fifth modification. The hollow double wall panel 5 and the connection counterpart member are also connected by the adhesive F. As a result, the adhesive F seals the gap between the through hole 55k and the bolt 8a on the lower surface (that is, connecting surface) 55h of the inclined portion 55U of the hollow double-walled panel 5. Also by this, the sealing performance of the closed space Sa inside the hollow double-walled panel 5 is sufficiently ensured.

As described above, according to the sixth modification, the inclined portion 55U of the connection portion (ie, the edge portion) 55 of the hollow double-walled panel 5 is formed on the connection surface (for example, the upper surface 32a of the side sill 3) of the connection counterpart member by the fastening component 8. Because of the fastening, the hollow double-walled panel 5 can be mechanically fixed to the connection opposite member by utilizing the inclined portion 55U connected to the connection opposite member.
Moreover, it can suppress that the edge part of the fastening components 8 protrudes in the thickness direction of the panel main body 54, As a result, while being able to suppress that the fastening components 8 are hooked from the outside, it can be made inconspicuous from the outside.

<Modification 7>
As shown in FIGS. 12 (a) and 12 (b), in the modification 7, in the above embodiment, the two wall portions 51 and 52 of the hollow double-walled panel 5 are divided into two divided wall portions 51 and 52. By bonding the peripheral portions 51s, 52s of the two wall portions 51s, 52, the peripheral portions 51s, 52s of the two wall portions 51, 52 are connected.

  More specifically, one (for example, the upper side) of the two wall portions 51 and 52 is formed in a shallow bottom box shape having an open bottom surface. More specifically, one wall 51 includes an upper wall 51a and a peripheral wall 51b which is provided to stand downward from the peripheral edge of the upper wall 51a. The other (e.g., lower side) wall portion 52 is formed in a shallow bottom box shape with an open top. More specifically, the other wall 52 includes a lower wall 52a and a peripheral wall 52b which is provided to stand upward from the peripheral edge of the lower wall 52a.

  An upper portion of the peripheral wall 52 b of the other wall 52 can be fitted inside the peripheral wall 51 b of the one wall 51. A lower surface 55a of the horizontal portion 55H and a side surface 54a of the panel main body 54 are formed on the lower portion of the peripheral wall 52b of the other wall 52. On the outer peripheral surface of the peripheral wall 52b of the other wall 52, a locking projection 52c is provided for locking the lower end of the peripheral wall 51b of the one wall 51. The locking projection 52c protrudes on the outer peripheral side on the outer peripheral surface of the peripheral wall 52b of the other wall 52 and is extended over the entire circumferential direction of the outer peripheral surface.

  As shown in FIG. 12A, in the state where the peripheral portions 51s and 52s of the two wall portions 51 and 52 are connected to each other, the upper portion of the peripheral wall portion 52b of the other wall portion 52 is the peripheral wall of one wall portion 51 It fits inside the part 51b. The upper end of the peripheral wall 52b of the other wall 52 abuts on the back surface of the upper wall 51a of the one wall 51, and the lower end of the peripheral wall 51b of the one wall 51 is the other peripheral wall 52b Is locked to the locking projection 52c.

  Further, as shown in FIG. 12B, the adhesive J is provided in the gap between the inner peripheral surface of the peripheral wall 51b of one wall 51 and the outer peripheral surface of the peripheral wall 52b of the other wall 52. It has been applied. The peripheral portions 51s and 52s of the two wall portions 51 and 52 are adhered and connected to each other by the adhesive J.

  As described above, according to the seventh modification, since the peripheral portions 51s and 52s of the two wall portions 51 and 52 are bonded and connected to each other, the shape and manufacturing method of the two wall portions 51 and 52 (i.e., the two hollow portions) It is possible to increase the degree of freedom of the double wall panel 5).

<Modification 8>
In the modification 8, in the above embodiment, the two wall portions 51 and 52 are formed of members having different masses, and the mass difference ratio of the two wall portions 51 and 52 (that is, mass difference ratio) ΔM (= (M1-M2) ÷ M1 × 100) is set within ± 10% (preferably 0%).
In the eighth modification, the peripheral portions of the two wall portions 51 and 52 may be integrally formed and connected to each other as in the above-described embodiment, and as in the seventh modification, divisions may be performed. It may be configured and connected by adhesion.

  FIG. 13 is a diagram showing the relationship between the sound shielding volume Q [Bb] of the hollow double wall panel 5 and the noise frequency F [Hz]. The sound shielding volume Q is the volume of noise that the hollow double wall panel 5 can isolate, and the noise frequency F is the frequency of noise. The graph P1 in FIG. 13 shows the relationship between the sound insulation volume Q and the noise frequency F in the hollow double-walled panel 5 of this modified example 8, and the graph P2 is a conventional hollow double-walled panel (for example, in the background art). The relationship between the sound shielding volume Q and the noise frequency F in the hollow double wall panel described in the section is shown.

  As can be seen from FIG. 13, in the graph P <b> 1, the sound shielding volume Q temporarily drops sharply on the low frequency side, and rises toward the high frequency side. In the graph P2, on the low frequency side, the sound shielding volume Q temporarily drops sharply but is higher than the graph P1, and on the high frequency side, it increases toward the high frequency but is always lower than the graph P1.

  The noise frequency F that can be heard by people is, for example, 500 Hz or more. As can be seen from FIG. 13, when the noise frequency F is less than 500 Hz, the graph P1 is lower than the graph P2. That is, the hollow double-walled panel of the conventional type has better soundproofness than the hollow double-walled panel 5 of the eighth modification. However, if the noise frequency F is 500 Hz or more, the graph P1 is always higher than the graph P2. That is, the hollow double-walled panel 5 of this modification 8 has better soundproofness than the conventional hollow double-walled panel.

  As in the case of the hollow double-walled panel 5 of this modification 8 and the conventional hollow double-walled panel, in the hollow double-walled panel in which the core material is filled between the two walls, The wall resonates with the noise frequency, which causes a temporary sharp drop in the noise isolation Q on the low frequency side. In such a hollow double-walled panel, the resonance frequency of the above-mentioned resonance shifts to the low frequency side as the mass difference ratio ΔM between the two wall portions approaches 0%. That is, the above graphs (graph 1 and graph 2) showing the relationship between the sound shielding volume Q and the noise frequency F shift to the low frequency side.

  In particular, if the mass difference ratio ΔM of the two wall portions is within ± 10%, the above graphs (graph 1 and graph 2) showing the relationship between the sound shielding volume Q and the noise frequency F are as shown in FIG. In addition, the whole graph is shifted to the low frequency side, and at noise frequency F = 500 Hz or more, Graph 1 is always higher than Graph 2.

  Therefore, in the hollow double wall panel 5 of this modification 8, the noise frequency F is 500 Hz or more, and the hollow double wall panel 5 of this modification 8 is more soundproof than the conventional hollow double wall panel. The mass difference ratio ΔM of the two wall portions 51 and 52 is set within ± 10% so as to always improve.

<Modification 9>
In the above embodiment, the hollow double-walled panel 5 is applied to the floor panel constituting the floor portion FL of the cabin, but the hollow double-walled panel 5 is applied to the roof, dash panel and door other than the floor panel It may be done. The hollow double-walled panel 5 in which a sound absorbing layer is added to one main surface (for example, the main surface on the cabin side) is particularly effective for application to a floor panel, a roof, a dash panel or a door. Moreover, the hollow double wall panel 5 which added the sound absorption layer and the outer skin layer to one main surface (for example, the main surface by the side of a vehicle interior) is effective especially for application to a floor panel, a roof, or a door. Moreover, the hollow double wall panel 5 which added the sound absorption layer to one main surface (for example, the main surface by the side of a compartment) is especially effective to the application to a dash panel.

<Modification 10>
In the above embodiment, the hollow double-walled panel 5 is connected to the frame member (the side sill 3 and the center tunnel portion 4), but as shown in FIG. Are connected with another hollow double-walled panel (i.e. another hollow double-walled panel according to the present invention) 10 of the same structure. Moreover, in this modification 10, each hollow double wall panel 5,10 is mutually connected by the adhesive material F and the fastening components 9 (bolt 9a and nut 9b).

  The connecting portion 55 of the hollow double wall panel 5 is provided with a through hole 55 b through which the fastening component 9 is inserted. The through holes 55 b are provided in a penetrating manner in the thickness direction of the connecting portion 55.

  Another hollow double-walled panel 10 is formed, for example, as a dash panel that divides an engine room and a vehicle compartment. Another hollow double-walled panel 10 is, like the hollow double-walled panel 5, in which the peripheral portions of the two wall portions 11, 12 are connected to each other, and a closed space between the two wall portions 11, 12 The core layer 103 (that is, the core material 103a) is formed on the

  Another hollow double-walled panel 10 is provided with a panel body 14 and an edge (i.e., a connecting portion) 15 other than the panel body 14 similarly to the hollow double-walled panel 5. The panel main body 14 is formed, for example, in a substantially L-shape in side view, and has a vertically extending vertical portion 141 and a horizontal portion 142 extending laterally from the lower portion of the vertical portion 141.

  The connection portion 15 protrudes in a plate shape in the horizontal direction with respect to the lateral portion 142 from the lower portion of the side surface 142 a of the lateral portion 142 of the panel main body 14. That is, the connecting portion 15 is provided to be receded in a step-like manner from the upper surface 142 b of the lateral portion 142 in the thickness direction of the lateral portion 142. The connecting portion 15 is provided with a through hole 15 u through which the fastening component 9 is inserted. The through holes 15 u are provided in a penetrating manner in the thickness direction of the connecting portion 15.

  In the connected state of the hollow double wall panel 5 and another hollow double wall panel 10, the lower surface (connection surface) 55a of the connection portion 55 of the hollow double wall panel 5 is a connection portion of another hollow double wall panel 10. The core member 53a in the connecting portion 55 covers the upper surface 15b of the connecting portion 15 and the core member 103a in the connecting portion 15 covers the lower surface 55a of the connecting portion 55. . Also, the side 55 c of the connection portion 55 of the hollow double wall panel 5 is adjacent to the side 142 a of another hollow double wall panel 10, and the side 54 a of the panel body 54 of the hollow double wall panel 5 is another hollow two. Adjacent to the end face 15 a of the connection portion 15 of the heavy wall panel 10.

  Further, in the above connection state, bonding is performed to the gap of the connection portion of each hollow double wall panel 5, 10 (that is, the gap between each surface 55c, 142a, the gap between each surface 55a, 15b, the gap between each surface 54a, 15a) Material F is applied. Further, the bolt 9a is screwed into the nut 9b by sequentially passing through the through holes 55b and 15u of the connecting portions 55 and 15 of the hollow double wall panels 5 and 10, respectively.

  As mentioned above, according to this modification 10, since the hollow double-walled panel 5 is connected with the hollow double-walled panel 10 of the same structure, the hollow double-walled panel 5 is used as a panel member of various parts of the vehicle cabin. It can be suitably used as

  The present invention is not limited to only the above-described embodiment and modification, but also includes a combination of the above-described embodiment and modification.

DESCRIPTION OF SYMBOLS 1 ... Car body structure 5 ... Hollow double wall panel 6, 7, 8, 9, ... Fastening parts 51, 52 ... Wall part 53 ... Core layer 53a ... Core material 54 ... Panel main body 55 ... Edge 55b, 55e, 55k ... penetration Hole 55H: Horizontal part 55V: Vertical part 55U: Inclined part 32a: Upper surface of side sill (connecting surface of connecting mating member)
F: Adhesive material G: Sealing material Sa: Closed space

Claims (17)

A vehicle body structure in which an edge of a hollow double wall panel is connected to a connection surface of a connection counterpart member,
In the hollow double-walled panel, peripheral portions of two walls are connected to each other, and a closed space between the two walls is filled with a core material, and the edge of the hollow double-walled panel is formed The core material is filled up to the inside of the
In a state in which the edge of the hollow double-walled panel is connected to the connection surface of the connection counterpart member, the core material filled in the edge of the hollow double-walled panel is the connection mating member Car body structure that covers the connecting surface. The vehicle body structure according to claim 1, wherein the connection counterpart member is a frame member of a vehicle body or a hollow double wall panel having the same structure as the hollow double panel. The vehicle body structure according to claim 1 or 2, wherein the edge of the hollow double-walled panel and the connection surface of the connection counterpart member are connected by adhesion. The vehicle body structure according to any one of claims 1 to 3, wherein the edge of the hollow double-walled panel and the connection surface of the connection counterpart member are connected by a fastening part. In the edge of the hollow double-walled panel, a through hole through which the fastening part is inserted is provided so as to penetrate in the thickness direction of the edge;
5. The vehicle body structure according to claim 4, wherein the ratio of the opening area is less than 1%, where the ratio of the opening area of one opening of the through hole to the area of one side main surface of the hollow double wall panel is an opening ratio. The vehicle body structure according to claim 4 or 5, wherein a gap between the edge of the hollow double-walled panel and the fastening component is sealed with a sealing material. The thickness of the core layer formed by filling the core material in the closed space of the hollow double-walled panel is a value within the range of 7 mm to 50 mm. Body structure according to one item. The two wall portions are formed of at least one material of a thermosetting resin, a thermoplastic resin, aluminum, magnesium or iron, or the two wall portions are made of the same material or different materials among the materials. The vehicle body structure according to any one of claims 1 to 7, which is formed in combination. The vehicle body according to any one of claims 1 to 8, wherein the two wall portions are formed of members having different masses, and the mass difference ratio ΔM of the two wall portions is within ± 10%. Construction. The vehicle body structure according to any one of claims 1 to 9, wherein peripheral portions of the two wall portions are bonded and connected to each other. The vehicle body structure according to any one of claims 1 to 9, wherein peripheral portions of the two wall portions are integrally formed and connected to each other. The hollow double-walled panel comprises the edge and a panel body other than the edge,
The edge has a horizontal portion that protrudes horizontally outward with respect to the panel body,
The vehicle body structure according to any one of claims 1 to 11, wherein the surface on the thickness direction side of the horizontal portion is connected to the connection surface of the connection counterpart member. The vehicle body structure according to claim 12, wherein the horizontal portion of the edge of the hollow double-walled panel is fastened to the connection surface with a fastening part. The hollow double-walled panel comprises the edge and a panel body other than the edge,
The edge has a vertical portion projecting perpendicularly to the panel body,
The vehicle body structure according to any one of claims 1 to 13, wherein a surface in a thickness direction of the vertical portion is connected to the connection surface of the connection counterpart member. The vehicle body structure according to claim 14, wherein the vertical portion of the edge is fastened to the connection surface with a fastening part. The hollow double-walled panel comprises the edge and a panel body other than the edge,
The edge has an inclined portion inclined on one side in the thickness direction of the panel body,
The vehicle body structure according to any one of claims 1 to 15, wherein a surface on a side in a thickness direction of the inclined portion is connected to the connection surface of the connection counterpart member. The vehicle body structure according to claim 16, wherein the inclined portion of the edge portion is fastened to the connection surface with a fastening part.

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