JP2014184885A - Resin exterior panel for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve positional accuracy between an outer panel and an inner panel, and to prevent deformation of the outer panel even the outer panel is thin by using an inexpensive adhesive for achieving lightweight of the exterior panel.SOLUTION: An inner panel 3 has adhesive faces 9a, 11a extending in a belt-shape by facing to an outer panel. The adhesive faces 9a, 11a have plural projection parts 13 formed so as to traverse the adhesive faces 9a, 11a in a width direction toward an outer panel 5 side. Tip ends of the projection parts 13 come into contact with a rear face 5c of the outer panel 5, and thickness of an adhesive 4 between the inner panel 3 and the outer panel 5 is regulated.

Description

  The present invention relates to a resin exterior panel for a vehicle in which a resin outer panel is joined to a resin inner panel via an adhesive, and more particularly to measures for preventing deformation of the outer panel due to shrinkage of the adhesive.

  2. Description of the Related Art Conventionally, there is a resin exterior panel for a vehicle in which a resin outer panel is joined to a resin inner panel via an adhesive, such as a hood hood for an automobile. In such a resin exterior panel for a vehicle, when the thickness of the panel is reduced in order to reduce the weight, the outer panel, which is generally less rigid than the inner panel, is pulled to the inner panel side by the curing and shrinkage of the adhesive, and the outer panel is The bonded part of the panel may be deformed so as to wave, and the appearance of the panel may be impaired. Various measures have been taken to prevent this undulating deformation.

  As an example, in Patent Document 1, the ratio of the thickness of the inner panel and the outer panel is limited to a predetermined value, and further, an adhesive whose elastic modulus after curing is limited to a predetermined value or less is used. A resin exterior panel for a vehicle that suppresses undulating deformation is disclosed.

JP 2009-35046 A (paragraphs 0013, 0014, FIGS. 2 to 5)

  However, the type of the adhesive used for the vehicle exterior resin panel of Patent Document 1 is limited and expensive. Furthermore, the resin exterior panel for a vehicle of Patent Document 1 needs to satisfy two conditions of the ratio of the thicknesses of both panels and the type of the adhesive. If these conditions are not met, the outer panel deforms so as to wave. As a result, the positional accuracy between the two panels decreases. Further, the outer panel can be made thick to some extent so that the above-described undulating deformation can be made inconspicuous, but there is a problem that the weight of the outer panel increases and the weight cannot be reduced.

  The present invention has been made in view of such points, and the object thereof is to improve the positional accuracy between the two panels and to deform the outer panel even if the outer panel is thin using an inexpensive adhesive. It is to achieve the weight reduction of the exterior panel.

  In order to achieve the above object, the present invention devises the structure of the adhesive surface formed on the inner panel.

  Specifically, the present invention is directed to a resin exterior panel for a vehicle in which a resin outer panel is joined to a resin inner panel via an adhesive, and the following solution is taken.

  That is, in the first invention, the inner panel has an adhesive surface extending in a strip shape so as to face the outer panel, and a plurality of protrusions cross the adhesive surface in the width direction on the adhesive surface. Projecting toward the outer panel, and the tip of the ridge is in contact with the back surface of the outer panel to define the thickness of the adhesive between the panels.

  The second invention is characterized in that, in the first invention, the protruding portion meanders the adhesive surface in the width direction.

  According to a third aspect of the present invention, in the first or second aspect, at least one end in the width direction of the adhesive surface is provided with a bank portion that restricts the spread of the adhesive in the width direction lower than the ridge portion. It is characterized by being.

  A fourth invention is characterized in that, in the third invention, the protruding portion is separated from the bank portion and the adhesive is continuous in the longitudinal direction of the bonding surface.

  According to the first invention, even if the outer panel is pulled toward the inner panel due to the shrinkage of the adhesive, the tip of the ridge is in contact with the back surface of the outer panel, so that the outer panel is made thinner than before. The distance between the inner panel and the outer panel is maintained, and the positional accuracy between the two panels is ensured. In addition, since the protrusions cross the adhesive surface in the width direction, the protrusions support the outer panel over the entire width direction of the adhesive surface, and the tensile load due to the adhesive is in the width direction of the adhesive surface. Distributed. Therefore, the surface of the outer panel can be kept flat. Thus, the surface of the outer panel can be kept flat regardless of the type of adhesive. As a result, an inexpensive adhesive can be used.

  According to the second aspect of the invention, since the protrusions are continuous with the adhesive surface meandering in the width direction, the rigidity against the load acting in the width direction is high. Therefore, when the outer panel is joined to the inner panel, there is no possibility of falling even if the protruding portion is pressed against the outer panel, and the inner panel can be formed relatively easily.

  According to the third invention, when the outer panel is joined to the inner panel whose adhesive surface is coated with the adhesive, the adhesive that is pressed by the outer panel and spreads in the width direction is blocked by the bank portion, The spread to is regulated and does not protrude from the adhesive surface. In this way, since the adhesive spreads efficiently over the entire bonding surface, both panels can be reliably bonded with a relatively small amount of adhesive. In addition, since the bank portion protrudes lower than the ridge portion, even when the adhesive contracts and the tip of the bank portion contacts the outer panel, the degree of contact is small. Therefore, it is possible to prevent deformation that undulates the outer panel along the bank portion.

  According to the fourth aspect of the invention, the adhesive is disposed in the gap between the ridge portion and the bank portion and is continuous in the longitudinal direction of the adhesive surface, so that the adhesive by the ridge portion is peeled off from the adhesive surface. The starting part does not occur. Therefore, the adhesive is not peeled off from the adhesive surface, and the adhesive strength can be ensured.

It is a hood hood exploded perspective view concerning an embodiment. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1. FIG. 3 is a view corresponding to FIG. 2 in a state where the hood is assembled. It is the IV section enlarged plan view of FIG. It is a FIG. 4 equivalent view of the bonnet food | hood which concerns on the modification of embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a bonnet hood 1 of an automobile as a resin exterior panel for a vehicle according to an embodiment of the present invention. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a view corresponding to FIG. 2 in a state where the hood 1 is assembled. The bonnet hood 1 has a substantially rectangular shape, the front end center portion is bent downward, the left and right end portions of the rear end protrude rearward, and the center portion is curved relatively gently upward. The bonnet hood 1 includes an inner panel 3 and an outer panel 5 joined to the inner panel 3 via an adhesive 4.

  The inner panel 3 is for securing the rigidity of the bonnet hood 1 and is made of a sheet molding compound (SMC). The inner panel 3 is a substantially rectangular flat inner panel with rear left and right ends projecting rearward. It has a main body part 7 and an inner panel front end part 8 that bends downward from the center part of the front end of the inner panel main body part 7. An outer rib 9 that rises toward the outer panel 5 is formed in a substantially rectangular frame shape on the entire outer peripheral edge of the inner panel main body 7 and the inner panel front end 8. Three inner ribs 11 are formed extending in the front-rear direction with a gap therebetween and rising to the outer panel 5 side. Each inner rib 11 is formed integrally with the outer rib 9 by connecting the front and rear sides of the outer rib 9.

  FIG. 4 is an enlarged plan view of a portion IV in FIG. Since the outer rib 9 and the inner rib 11 have the same configuration, the configuration of the outer rib 9 will be described here, and the description of the configuration of the inner rib 11 will be omitted. On the upper surface of the outer rib 9, an adhesive surface 9a (the adhesive surface 11a for the inner rib 11) extends in a band shape. On the bonding surface 9a, a protrusion 13 extending in the longitudinal direction protrudes toward the outer panel 5 side. The protrusion 13 meanders the adhesive surface 9a in the width direction and crosses the adhesive surface 9a at a plurality of locations. Further, at both ends in the width direction of the bonding surface 9 a, bank portions 15, 15 lower than the protruding portion 13 are provided to protrude toward the outer panel 5 over the entire circumference of the outer rib 9. The protruding portion 13 is separated from the bank portions 15 and 15.

  The outer panel 5 is made of polypropylene, and as shown in FIG. 1, the outer panel body 5 a that has the same shape as the inner panel 3 and overlaps the inner panel body 7, and the inner panel front end 8. And an outer panel front end portion 5b that has the same shape and overlaps the inner panel front end portion 8. The outer panel main body 5a has a curved shape with a central portion protruding upward, that is, on the side opposite to the inner panel 3 side.

  The adhesive 4 that joins the inner panel 3 and the outer panel 5 is made of a polyurethane-based adhesive. The inner panel 3 made of SMC and the outer panel made of polypropylene have low adhesion to the polyurethane adhesive. Therefore, a primer treatment is applied to the bonding surfaces 9a and 11a of the inner panel 3 and the bonding surfaces corresponding to the outer ribs 9 of the outer panel 5 to bond the adhesive 4 and the panels 3 and 5 to each other. Is secured. The adhesive 4 is disposed between the protruding portion 13 and the bank portions 15 and 15 on both sides thereof, and is continuous in the longitudinal direction of the adhesive surfaces 9a and 11a.

  When the hood hood 1 having the above configuration is assembled, first, the adhesive 4 is applied to the adhesive surfaces 9a and 11a of the inner panel 3. At this time, the adhesive 4 is continuously applied in the longitudinal direction between the bank portions 15 and 15 across the ridge portion 13.

  Next, the outer panel 5 is pressed against the inner panel 3 side. At this time, the adhesive 4 pressed by the outer panel 5 spreads in the width direction, but is dammed by the bank portions 15 and 15 and is restricted from spreading in the width direction, and then the longitudinal direction of the bonding surfaces 9a and 11a. To spread. Thus, since the adhesive 4 spreads efficiently over the entire bonding surfaces 9a and 11a, both the panels 3 and 5 can be reliably bonded with a relatively small amount of the adhesive 4. And if the front-end | tip of the protrusion part 13 contact | abuts to the back surface 5c of the outer panel 5, the space | interval of the inner panel 3 and the outer panel 5 will be hold | maintained, and the positional accuracy between both panels 3 and 5 will be ensured. Furthermore, since the protruding portion 13 meanders the bonding surfaces 9a and 11a in the width direction, the rigidity against a load acting in the width direction is high. Therefore, there is no possibility that the ridge portion 13 will fall even if it is pressed against the outer panel 5.

  Thereafter, the adhesive 4 is cured and contracted, and the thickness of the adhesive 4 is defined by the protrusion 13. When the adhesive 4 is cured / contracted, the outer panel 5 having a lower rigidity than the inner panel 3 is pulled toward the inner panel 3, but the protruding portion 13 is formed at a plurality of locations of the adhesive surfaces 9 a, 11 a. Since 11a is crossed in the width direction, the protrusion 13 supports the outer panel 5 over the entire width direction of the bonding surfaces 9a and 11a, and the tensile load by the adhesive 4 is applied in the width direction of the bonding surfaces 9a and 11a. To be distributed. Therefore, the surface of the outer panel 5 can be kept flat. In this manner, the surface of the outer panel 5 can be flattened regardless of the type of the adhesive 4. As a result, an inexpensive adhesive 4 can be used.

  In addition, since the bank portions 15 and 15 are provided so as to protrude lower than the ridge portion 13, even when the adhesive 4 contracts and the tips of the bank portions 15 and 15 come into contact with the outer panel 5, the degree of contact Is small. Therefore, it is possible to prevent the undulating deformation of the outer panel 5 along the bank portions 15 and 15.

  Further, since the protrusion 13 is continuous with the adhesive surfaces 9a and 11a meandering in the width direction, the rigidity against a load acting in the width direction is high. Therefore, when the outer panel 5 is joined to the inner panel 3, there is no risk of falling even if the ridge 13 is pressed against the outer panel 5, and the molding of the inner panel 3 becomes relatively simple.

  Furthermore, since the adhesive 4 is disposed in the gap between the ridge portion 13 and the bank portions 15 and 15 and is continuous in the longitudinal direction of the bonding surfaces 9a and 11a, the adhesive 4 by the ridge portion 13 is used. However, the raised end portion that peels off from the bonding surfaces 9a and 11a does not occur. Therefore, the adhesive 4 is not peeled off from the adhesive surfaces 9a and 11a, and the adhesive strength can be ensured.

  In the above embodiment, the single protrusion 13 meanders in the width direction of the bonding surfaces 9a and 11a. However, the present invention is not limited to this. For example, as shown in FIG. .. May be provided. Each protrusion 17 extends in the width direction of the bonding surface 9 a and is inclined in the vertical direction, and both ends are separated from the bank portions 15 and 15.

Moreover, in the said embodiment, although the bank part 15 protrudes in the width direction both ends of adhesion surface 9a, 11a, it is not limited to this, Even if it protrudes only in the width direction end of adhesion surface 9a, 11a Good.
Furthermore, in the said embodiment, when assembling the bonnet food | hood 1, the example which applied the adhesive agent 4 to the inner panel 3 side was shown, However, You may apply | coat the adhesive agent 4 to the outer panel 5. FIG.

  Moreover, in the said embodiment, although the vehicle exterior panel of this invention was demonstrated applying to the bonnet food | hood 1, it is not limited to this, For example, even if it applies to a trunk lid, a back door, a fender panel, and a roof panel Good.

  Moreover, in the said embodiment, although the inner panel 3 is comprised by SMC, you may be comprised by the polypropylene (PPGF) containing glass fiber.

  Moreover, in the said embodiment, although the outer panel 5 is comprised with the polypropylene, it is not limited to this, For example, you may comprise with ABS (acrylonitrile butadiene styrene), a polycarbonate, etc.

  Furthermore, in the said embodiment, although the adhesive agent 4 is comprised with the polyurethane-type adhesive agent, it is not limited to this, For example, you may comprise with an epoxy-type adhesive agent etc.

  Furthermore, in the said embodiment, although all the inner side ribs 11 are provided so that it may extend in the front-back direction, it is not limited to this, For example, you may provide further the rib extended in the left-right direction.

  As described above, the resin exterior panel for a vehicle according to the present invention can be applied to a use or the like that suppresses appearance defects due to shrinkage of an adhesive and improves appearance.

1 Bonnet hood (resin exterior panel for vehicles)
3 Inner panel 4 Adhesive 5 Outer panel 5c Back surface 9a, 11a of outer panel Adhesive surface 13, 17 Projection part 15 Bank part

Claims (4)

The resin outer panel (5) is a resin outer panel for a vehicle joined to the resin inner panel (3) via an adhesive (4),
The inner panel (3) has an adhesive surface (9a, 11a) extending in a band shape facing the outer panel (5),
On the bonding surfaces (9a, 11a), the protrusions (13) protrude toward the outer panel (5) so as to cross the bonding surfaces (9a, 11a) in the width direction. The tip of the ridge (13) is in contact with the back surface (5c) of the outer panel (5) to define the thickness of the adhesive (4) between the panels (3, 5). Resin exterior panel for vehicles. In the resin exterior panel for vehicles according to claim 1,
The resin exterior panel for vehicles, wherein the protrusion (13) meanders the adhesive surfaces (9a, 11a) in the width direction. In the resin exterior panel for vehicles according to claim 1 or 2,
At least one end in the width direction of the adhesive surfaces (9a, 11a) is provided with a bank portion (15) that regulates the width of the adhesive (4) in the width direction so as to be lower than the ridge portion (13). A resin exterior panel for a vehicle. In the resin exterior panel for vehicles according to claim 3,
The ridge portion (13) is spaced apart from the bank portion (15), and the adhesive (4) is continuous in the longitudinal direction of the adhesive surfaces (9a, 11a). Made of exterior panels.

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