JP2018162003A - Vehicle panel structure and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle panel structure which can improve vibration damping performance while achieving a reduction in weight, and to provide a method for manufacturing the vehicle panel structure.SOLUTION: A vehicle panel structure includes a pair of base panels facing in a separated manner, a pair of filler parts provided on mutually facing inner faces of the pair of base panels, and a viscoelastic body provided on the pair of filler parts, where the pair of filler parts are bonded to each other through the viscoelastic body, and the vehicle panel structure is provided with a swollen part which is formed on at least one base panel so as to be swollen to an outer surface side and is formed corresponding to the viscoelastic body.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle panel structure and a manufacturing method thereof, and more particularly to a vehicle panel structure in which a pair of base panels are coupled via a viscoelastic body and a manufacturing method thereof.

  Conventionally, panel members constituting a wide surface of a vehicle body such as a roof panel and a floor panel spanned between vehicle body frames have been used. In such a panel member, vibration in a low frequency band (for example, 20 to 50 Hz) is propagated in a direction parallel to the panel surface due to vehicle body deformation caused by vibration transmitted from the road surface when the vehicle is traveling, The indoor comfort, the so-called riding comfort of the vehicle is impaired. If the rigidity of the panel member is increased in order to attenuate the vibration generated in the panel member, the riding comfort of the vehicle can be improved, but there is a possibility that the weight of the vehicle body and the production cost increase.

  In addition, viscoelastic bodies such as rubber are known to have vibration damping performance because they exhibit behavior such as creep deformation and stress relaxation. Creep deformation is viscoelastic deformation for a constant force, and stress relaxation phenomenon is a phenomenon that attempts to return to an equilibrium state when it deviates from a mechanical equilibrium state by a predetermined factor. When the viscoelastic body is stretched with vibration, the entropy of the viscoelastic body decreases, so that the viscoelastic body changes in the contraction direction to increase the reduced entropy. The amount of heat corresponding to the amount of entropy reduction due to this extension is released to the outside, and as a result, the viscoelastic body moves so as to return to the initial state.

  Based on the above, various proposals using the characteristics of this viscoelastic body have been made for the purpose of improving the vibration damping performance while avoiding an increase in the weight of the vehicle body. For example, the carbon fiber reinforced plastic molded body of Patent Document 1 has a viscosity separated in a plane parallel direction between a first CFRP (Carbon Fiber Reinforced Plastics) layer, a second CFRP layer, and first and second CFRP layers. A pair of damping elastic layers made of an elastic body and a high-rigidity resin region sandwiched between the pair of damping elastic layers between the first and second CFRP layers. Damping performance is secured by the damping elastic layer, and bending rigidity in the longitudinal direction of the first and second CFRP layers is secured by the high-rigidity resin region.

JP 2011-183562 A

  The carbon fiber reinforced plastic molded body of Patent Document 1 converts part of vibration energy into thermal energy by deforming a viscoelastic body (damping elastic layer) following the vibration of the base panel (CFRP layer). The vibration control performance is improved by reducing the vibration energy of the base panel. Here, in order to further improve the function, it is conceivable that a foam such as urethane is joined to the base panel and a viscoelastic body is joined to the foam. By adopting such a configuration, it is possible to expect an improvement in sound insulation in addition to weight reduction and vibration damping.

  However, as a result of investigation by the present inventor, in a panel member in which a foam is joined to a pair of base panels and a plurality of viscoelastic bodies are sandwiched between the pair of foams, vibration damping as expected It has been found that there is a possibility that the performance cannot be exhibited. Specifically, when vibration is transmitted in a direction parallel to the panel surface of the base panel, a pair of foams sandwiching the viscoelastic body is relatively displaced in a direction parallel to the panel surface. There is a possibility that slippage occurs between the two and the deformation of the viscoelastic body is hindered, and the vibration damping performance is not exhibited. In addition, the viscoelastic body may be displaced from the initial position due to slipping, so that distortion deformation is not eliminated, and vibration damping performance may be reduced.

  An object of the present invention is to provide a vehicle panel structure capable of improving vibration damping performance while reducing the weight and a manufacturing method thereof.

  According to the first aspect of the present invention, a pair of base panels opposed to each other in a spaced manner, a pair of filler portions respectively provided on opposing inner surfaces of the pair of base panels, and the pair of fillers A vehicular panel structure including a viscoelastic body provided between the sections and having the pair of filler portions coupled thereto via the viscoelastic body so as to bulge outwardly from at least one base panel. A bulging portion formed so as to correspond to the viscoelastic body is provided.

  With the above-described configuration, it is possible to exhibit the expected vibration damping performance by making it difficult for displacement to occur due to the slip of the viscoelastic body that attenuates the vibration of the vehicle panel structure by strain deformation.

  A second aspect of the invention is characterized in that, in the first aspect of the invention, a plurality of the viscoelastic bodies are disposed in a state of being separated from each other between the pair of filler portions.

  With the above configuration, the vibration damping performance of the vehicle panel structure can be improved by a plurality of viscoelastic bodies, and the viscoelastic body is partially disposed in the vehicle panel structure, so that the weight of the vehicle panel structure is reduced. And manufacturing costs can be reduced.

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the base panel is formed of a fiber reinforced thermoplastic resin material, and the filler portion is formed of a thermoplastic foamed resin material.

  With the above configuration, the rigidity of the vehicle panel structure can be improved by increasing the rigidity of the base panel, and the weight of the vehicle panel structure can be reduced.

  The invention of claim 4 is characterized in that, in the invention of any one of claims 1 to 3, the bulging portion is formed only on one base panel of a pair of base panels.

  With the above configuration, it is possible to achieve both the vibration damping performance and the design of the vehicle panel structure.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the vehicle is incorporated into one or a plurality of roof panels, floor panels, and side panels of the vehicle.

  With the above configuration, a vehicle with improved vibration damping performance can be configured.

  According to a sixth aspect of the present invention, in the method for manufacturing a vehicle panel structure formed by connecting a pair of base panels in an opposing manner, one of the pair of base panels expands in a direction away from the other. A bulging portion forming step for forming a protruding portion, a filler portion forming step for forming a filler portion on opposite surfaces of the pair of base panels, and the filler portion facing each other in the mold. The pair of base panels are spaced apart via a viscoelastic body, a member disposing step of disposing the viscoelastic body at a position corresponding to the bulging portion, the pair of base panels and the A joining step of joining the pair of base panels via the viscoelastic body by heating the filler part and the viscoelastic body to join the filler part to the viscoelastic body; A pair of base panels is recessed corresponding to the bulging portion. It is characterized by having a molding step of molding a mold with a.

  With the above configuration, it is possible to form a vehicular panel structure that is less likely to cause a displacement of the viscoelastic body at the time of manufacturing the vehicular panel structure and can achieve both vibration damping performance and design.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle panel structure which can improve vibration damping performance, and its manufacturing method can be provided, aiming at weight reduction.

It is a principal part perspective view of the vehicle which applied the panel structure for vehicles of this invention to the roof panel. It is a top view of a roof panel. FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. It is sectional drawing of a base panel. It is sectional drawing of the base panel in which the bulging part was formed. It is sectional drawing of the base panel in which the filler layer was formed. It is sectional drawing of the base panel which has the bulging part in which the filler layer was formed. It is sectional drawing which shows a member arrangement | positioning process. It is sectional drawing which shows the member arrange | positioned in the metal mold | die for shaping | molding. It is sectional drawing which shows a shaping | molding process.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

First, the overall configuration of the vehicle 1 will be described.
As shown in FIG. 1, the vehicle 1 is provided with a pair of left and right front pillars 2 positioned on the left and right sides of the front windshield. Respectively). The roof side rails 3 extending rearward are connected to the upper ends of the pair of front pillars 2, respectively. Although not shown, a front header is constructed between the front end portions of the pair of roof side rails 3, and a rear header is constructed between the rear end portions.

  A region surrounded by the pair of roof side rails 3, the front header, and the rear header is covered with a roof panel 4 disposed so as to extend in the front-rear and left-right directions in the upper part of the vehicle body. As shown in FIGS. 2 and 3, the roof panel 4 is formed in a substantially rectangular shape in a plan view, and is formed in a gently curved shape in which a front part and a rear part are located below the intermediate part in a side view. ing. FIG. 3 shows an enlarged vertical scale.

Next, the roof panel 4 having the vehicle panel structure of the present invention will be described.
As shown in FIGS. 1 to 3, the roof panel 4 includes a first base panel 10 and a second base panel 20 (a pair of base panels) opposed to each other in a spaced manner, and a first base panel 10 and a second base panel. A viscoelastic body between the first filler portion 12 and the second filler portion 22 (a pair of filler portions), and between the first filler portion 12 and the second filler portion 22 on the opposing inner surfaces of the panel 20. 31-34. The first and second filler parts 12 and 22 are joined via the viscoelastic bodies 31 to 34, and the first and second filler parts 12 and 22 are joined to the first and second base panels 10 and 20, respectively. Thus, the roof panel 4 is formed.

  The first base panel 10 is composed of a carbon fiber reinforced thermoplastic resin (thermoplastic CFRP) material in which carbon fibers arranged to extend in the front-rear direction and carbon fibers arranged to extend in the left-right direction are respectively used as reinforcing materials. Has excellent rigidity. Moreover, the 1st, 2nd base panels 10 and 20 can also be comprised with the fiber reinforced thermoplastic resin material which mix | blended the thermoplastic resin base material with the short fiber as a reinforcing material. As the reinforcing material, glass fiber, aramid fiber, cellulose nanofiber, or the like can be used. Moreover, the 1st, 2nd base panels 10 and 20 can also be comprised with metal materials, such as an aluminum alloy.

  The first filler portion 12 is provided on the lower surface (inner surface) of the first base panel 10 and is made of a material having lower rigidity than the first base panel 10, for example, a foamed material such as polypropylene, polyurethane, polyethylene, or polyester. ing.

  The second base panel 20 is made of the same material as that of the first base panel 10 and bulges to the lower surface side (outer surface side) of the second base panel 20 at positions corresponding to the viscoelastic bodies 31 to 34, respectively. Protruding portions 25 to 28 are formed. The height (depth) of the bulging portions 25 to 28 is, for example, 1 mm. A second filler portion 22 similar to the first filler portion 12 is formed on the upper surface (inner surface) of the second base panel 20.

  As shown in FIG. 2, the viscoelastic bodies 31 to 34 are formed in the same substantially rectangular shape in plan view, and are a virtual front-rear direction line X and a vehicle width direction line Y that pass through the center P of the roof panel 4. Are arranged a predetermined distance apart in the front-rear direction and the left-right direction so as to be line-symmetric with respect to each other.

  As shown in FIG. 3, the viscoelastic bodies 31 and 34 are each formed in a panel shape so as to have substantially the same thickness as the thickness (for example, 1 to 2 mm) of the first and second filler parts 12 and 22. ing. Although not shown, the same applies to the viscoelastic bodies 32 and 33. The viscoelastic bodies 31 to 34 have an upper surface bonded to the lower surface (inner surface) of the first filler portion 12 and a lower surface bonded to the upper surface (inner surface) of the second filler portion 22. The viscoelastic bodies 31 to 34 are made of, for example, a rubber material such as styrene / butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, or ethylene propylene rubber. Moreover, it may replace with the said rubber material and may use a polyester resin vinyl ester resin, a polyurethane resin, and another elastomer resin.

Next, the manufacturing method of the panel structure for vehicles of this invention is demonstrated along the manufacturing process of the roof panel 4. FIG. In addition, sectional drawing used for description shows an enlarged vertical scale.
A first base panel 10 having a flat plate shape shown in FIG. 4 and a second base panel 20 provided with bulging portions 25 and 28 bulging on the lower surface side shown in FIG. To do. The bulging portions 25 to 28 are formed by, for example, hot pressing a plate-like thermoplastic CFRP material similar to the first base panel 10 in the bulging portion forming step.

  Next, in the filler portion forming step, the first filler portion 12 is formed on the first base panel 10 as shown in FIG. Further, as shown in FIG. 7, the second filler portion 22 is formed on the second base panel 20. At this time, the first and second filler parts 12 and 22 formed in a sheet shape are joined to the first and second base panels 10 and 20, respectively, and the first and second filler parts 12 and 22 are formed. The surface of is substantially flat. In the bulging portions 25 to 28, the second filler portion 22 and the second base panel 20 are separated from each other, but the second filler portion 22 is joined along the bulging shape of the second base panel 20. Also good. Further, the first and second filler parts 12 and 22 may be formed by foaming one surface side of the first and second base panels 10 and 20.

  Next, in the member arranging step, as shown in FIG. 8, the second base panel 20 with the second filler portion 22 facing upward is placed on, for example, the work pallet 35, and the mold 36 for positioning is placed on the work pallet. Attach to 35. The viscoelastic bodies 31 to 34 are arranged by positioning with the mold 36, and the first base panel 10 is arranged thereon so that the outer edge of the first base panel 10 is aligned with the outer edge of the second base panel 20. At this time, the 1st base panel 10 is arrange | positioned so that the 1st filler material part 12 may face down and the 1st, 2nd filler material parts 12 and 22 may face through the viscoelastic bodies 31-34.

  Next, in the joining step, the arranged member is heated to a joining temperature (for example, 100 ° C. to 120 ° C.) by the heater 38 or the like, and the first filler portion 12 is joined to the upper surface portions of the viscoelastic bodies 31 to 34. At the same time, the second filler portion 22 is joined to the lower surface portions of the viscoelastic bodies 31 to 34. In this way, a flat panel member 40 in which the first base panel 10 and the second base panel 20 are joined is formed. In this bonding step, pressure may be applied so as to compress in the direction perpendicular to the panel surface.

  Next, in the molding step, as shown in FIGS. 9 and 10, the flat panel member 40 is placed in a molding die constituted by the dies 42 and 43, and a molding temperature higher than the joining temperature (for example, 130). C. to 150.degree. C.) to form a gently curved shape. Although not shown in part, the mold 42 is provided with recesses 45 to 48 corresponding to the bulging portions 25 to 28 of the second base panel 20.

  At the time of molding, the second filler material portion 22 is pushed into the bulging portions 25 to 28 by the pressure transmitted through the viscoelastic bodies 31 to 34, and the second filler material portion 22 and the second base panel 20 are separated. The parts that were left are joined. At this time, the molding pressure also acts on the peripheral portions of the viscoelastic bodies 31 to 34 in the direction toward the center of the viscoelastic bodies 31 to 34, and the viscoelastic bodies 31 to 34 escape outward from the peripheral portions. Regulate leaving. Accordingly, displacement of the viscoelastic bodies 31 to 34 due to molding pressure is suppressed.

  Next, the molds 42 and 43 are cooled and removed to obtain the roof panel 4 having the vehicle panel structure shown in FIG. The thickness and temperature are only examples, and are not limited thereto.

Next, functions and effects of the present invention will be described.
Since the bulging portions 25 to 28 are provided so as to correspond to the viscoelastic bodies 31 to 34 in the vehicle panel structure, the positional deviation of the viscoelastic bodies 31 to 34 during the manufacture of the vehicle panel structure and the distortion deformation is prevented. It can be made difficult to generate, and the expected vibration damping performance can be exhibited. In addition, since the plurality of viscoelastic bodies 31 to 34 are provided in a state of being separated from each other, the vibration damping performance of the vehicle panel structure can be improved, and the vehicle panel structure can be reduced in weight and the manufacturing cost can be reduced. can do.

  In addition, the first and second base panels 10 and 20 are formed of a fiber reinforced thermoplastic resin material, and the first and second filler portions 12 and 22 are formed of a thermoplastic foamed resin material. The second base panels 10 and 20 can be made highly rigid, and a lightweight vehicle panel structure can be configured. Furthermore, since the bulging portions 25 to 28 are formed only on the second base panel 20 of the first and second base panels 10 and 20, and the first base panel 10 has a smooth surface, vibration damping performance and designability are achieved. Can be compatible.

  Since the vehicle panel structure having the vibration damping performance is incorporated into one or more of the roof panel 4, the floor panel, and the side panel of the vehicle 1, the vehicle 1 with an improved vibration damping function can be configured.

  In addition, those skilled in the art can implement the invention by adding various modifications to the embodiment without departing from the spirit of the invention, and the invention includes such modifications.

4 roof panel 10 first base panel 12 first filler part 20 second base panel 22 second filler part 25-28 bulging parts 31-34 viscoelastic body 36 mold 38 heater 40 panel members 42, 43 mold 45-48 recess

Claims (6)

A pair of base panels opposed to each other in a spaced manner, a pair of filler portions provided on opposite inner surfaces of the pair of base panels, and a viscosity provided between the pair of filler portions. In a vehicle panel structure including an elastic body, and the pair of filler portions coupled through the viscoelastic body,
At least one base panel is provided with a bulging portion formed so as to bulge to the outer surface side, and is formed so as to correspond to the viscoelastic body. Panel structure.   The vehicular panel structure according to claim 1, wherein a plurality of the viscoelastic bodies are arranged in a state of being separated from each other between the pair of filler portions.   The vehicle panel structure according to claim 1, wherein the base panel is formed of a fiber reinforced thermoplastic resin material, and the filler portion is formed of a thermoplastic foamed resin material.   The vehicular panel structure according to any one of claims 1 to 3, wherein the bulging portion is formed only on one base panel of a pair of base panels.   The vehicle panel structure according to any one of claims 1 to 4, wherein the vehicle panel structure is incorporated in one or more of a roof panel, a floor panel, and a side panel of the vehicle. In a method for manufacturing a vehicle panel structure formed by connecting a pair of base panels in an opposing manner,
A bulging portion forming step of forming a bulging portion bulging in one of the pair of base panels in a direction away from the other; and
A filler part forming step of forming filler parts on the mutually opposing inner surfaces of the pair of base panels;
A member that disposes the pair of base panels spaced apart via a viscoelastic body so that the filler portion faces in the mold, and disposes the viscoelastic body at a position corresponding to the bulging portion. The placement process;
The pair of base panels are coupled via the viscoelastic body by heating the pair of base panels, the filler portion, and the viscoelastic body to join the filler portion to the viscoelastic body. A bonding process;
And a molding step of molding the pair of joined base panels with a molding die having a recess corresponding to the bulging portion.