JP6036924B2 - Resin panel joint structure - Google Patents

Description

  The present invention relates to a joint structure of a resin panel in which a resin outer panel and a resin inner panel are bonded with an adhesive.

As a resin panel bonding structure in which a resin outer panel and a resin inner panel are bonded with an adhesive, for example, a resin back door described in Patent Documents 1 and 2 below is known. .
In the resin back door 10 shown in FIG. 2, as shown in FIG. 3, the resin outer panel 11 and the resin inner panel 12 are bonded to each other by the adhesive 13 at the respective edge portions 21 and 31. In the inner panel 12, a rising portion 33 and an edge portion 31 rising in a direction away from the outer panel 11 are integrally provided via a bent portion 34. A smooth outer surface 22 is provided on the outer panel 11 at a position corresponding to the bent portion 34 and the rising portion 33.

  In order to manufacture such a resin back door 10, an outer panel 11 and an inner panel 12 molded in advance in a predetermined shape are prepared and bonded to the edge 21 of the outer panel 11 or the edge 31 of the inner panel 12. Apply the agent. The adhesive is continuously applied along the edge 21 of the outer panel 11 or the edge 31 of the inner panel 12. Then, both edge portions 21 and 31 are opposed to each other, and in a state where the adhesive 13 is disposed between the both edge portions 21 and 31, the adhesive is cured by heating, and the outer panel 11 and the inner panel 12 are heated. And firmly adhere.

A panel structure as shown in Patent Document 3 below is also known as a resin panel bonding structure in which a resin outer panel and a resin inner panel are bonded with an adhesive.
In this panel structure, in order to reduce the shearing force applied to the adhesive bonding the outer panel and the inner panel, for example, each panel is provided with a flange portion that is substantially perpendicular to the general surface. The hinge part is provided between the parts. Here, as shown in FIG. 5, FIG. 6, FIG. 8 to FIG. 11 of Patent Document 3, by providing a hinge portion having a thickness of 5 mm or less on the inner panel with a width of 5 mm or more, shearing applied to the adhesive is performed. The force is converted into tensile force.

JP 2010-188792 A JP 2010-247676 A JP 2006-341760 A

  In the conventional resin panel joining structure, an adhesive region is set at the edge 21 of the outer panel 11 and the edge 31 of the inner panel 12, and the adhesive 13 has the width of the adhesive region of both the edges 21, 31 and It was applied in an amount corresponding to the bonding interval. Here, the adhesive 13 is set inward from the edges 21 and 31 by setting the bonding area of the edges 21 and 31 at a position slightly spaced from the end of the edges 21 and 31 on the rising portion 33 side. It was prevented from overflowing excessively. Therefore, in the conventional resin panel joining structure, the width on the side of the edge portions 21 and 31 is often wide. If the outer panel 11 and the inner panel 12 have a wide width on the edge portions 21 and 31 side, for example, various problems such as a narrow door opening occur. Therefore, the width of the edge portions 21 and 31 should be as small as possible. Is desired.

If the width of the edge 21 of the outer panel 11 and the edge 31 of the inner panel 12 is simply narrowed in the conventional resin back door 10, when an appropriate amount of the adhesive 13 is applied to an appropriate position, As shown by a solid line in FIG. 3, the adhesive 13 is disposed only between the edges 21 and 31.
However, since it is not easy to uniformly control the application amount and position of the adhesive 13, the adhesive is often applied excessively or applied to a position near the bent portion 34 during the application operation. In that case, as shown by a broken line in FIG. 3, the adhesive 13 is disposed not only between the edges 21 and 31 but also between the inner surface of the bent portion 34 of the inner panel 12 and the outer panel 11. The
When the adhesive 13 is disposed between the inner surface of the bent portion 34 and the outer panel 11 and hardened, the shape rigidity around the bent portion 34 of the inner panel 12 is large, so that both edges bonded with reduced flexibility. The parts 21 and 31 are difficult to deform.

In this state, when the outer panel 11 and the inner panel 12 expand due to a temperature rise, a difference occurs in the extension of the panels 11 and 12 due to a difference in shape and the like, and the outer panel 11 and the inner panel 12 are distorted. . Therefore, only the portion with low rigidity is excessively deformed.
Since the outer panel 11 constitutes the outer surface 22 of the vehicle body, the outer panel 11 has a smoother shape than the inner panel 12, and the bending rigidity of portions corresponding to the bent portion 34 and the rising portion 33 of the inner panel 12 is low. ing.

  As a result, for example, when the adhesive 13 is heated and cured at the time of manufacture, or when the outer panel 11 and the inner panel 12 are thermally expanded due to the temperature rise after the resin back door 10 is mounted on the vehicle, FIG. As described above, a streak-like concave shape is generated on the outer surface 22 of the outer panel 11 corresponding to the rising portion 33 of the inner panel 12. In particular, the outer panel 11 is an appearance part, and when such a concave shape is generated, the appearance quality is remarkably deteriorated, which is a serious problem.

  If a hinge part having a wide width as in Patent Document 3 is provided in the bent part 34 of the inner panel 12 as shown in FIGS. The width of the entire edge 21, 31 side is wider than the portion 33, which is not preferable.

  Accordingly, an object of the present invention is to provide a resin panel joining structure capable of narrowing the width on the edge side while preventing deterioration in appearance quality due to temperature change on the smooth surface of the outer panel. To do.

The bonding structure of the resin panel of the present invention that achieves the above object is such that the edge adhesion region in the resin outer panel and the edge adhesion region in the resin inner panel are bonded to each other,
The inner panel is disposed between a rising portion rising in a direction away from the smooth surface of the outer panel, and between the rising portion and an edge of the inner panel, and in a direction away from the smooth surface of the outer panel. A bent portion inclined at an angle smaller than the rising portion ; a constricted portion formed in a streak shape along the bent portion at a position adjacent to the rising portion of the bent portion; an inner surface of the bent portion; Between the constricted part, a weak body part that is continuously provided in the longitudinal direction along the bent part and is thinner than the rising part and the edge part is provided,
An edge portion of the inner panel, the weak body portion, and the rising portion are provided integrally,
When thermal distortion occurs due to a difference in deformation due to a temperature change between the outer panel and the inner panel, the weak body portion formed in a streak shape by the constricted portion of the bent portion causes an edge of the outer panel and The edge of the inner panel is deformed with respect to the rising portion to absorb the thermal strain .
The said structure WHEREIN: The recessed part is provided between the said weak body part and the said edge part, and the broken line dented toward the outer surface is provided in this recessed part. This bend line further improves the flexibility of the weak body part, and even if the adhesive protrudes, it moves toward the center of the panel, so that the adhesive can be prevented from moving to the inclined part and the rising part.
Moreover, since an adhesive agent is arrange | positioned to a part of the said edge part side of the said recessed part, since it can adhere | attach firmly, an edge part is hard to peel off and the deformation amount of an inner panel and an outer panel can be increased.

  According to the joint structure of the resin panel of the present invention, the adhesive accommodating space is provided adjacent to the adhesion region by the recess formed on the inner surface of the bent portion. Therefore, the adhesive that protrudes from the adhesive area when the edge of the inner panel and the edge of the water panel are bonded is stored in the adhesive storage space, and the adhesive is excessive between the inner surface of the bent portion and the outer panel. It can be prevented from spreading to reach the vicinity of the rising portion. Thereby, it can prevent that the softness | flexibility in the bending part periphery of an inner panel falls.

  In particular, since the constricted part is provided in the bent part and the weak body part thinner than the thickness of the rising part is formed, the edge part can be easily deformed in the falling direction with respect to the rising part of the inner panel. Moreover, since the constricted portion is provided on the outer peripheral surface of the bent portion, there is no possibility that the adhesive enters the constricted portion and hardens.

  As a result, when the edge of the outer panel and the edge of the inner panel are bonded, when the temperature change causes different amounts of thermal expansion or contraction between the outer panel and the inner panel, the distortion of the edge is reduced. Can be absorbed by deformation. Therefore, it is possible to prevent only the outer panel from being deformed due to a temperature change during manufacturing or use, and at the position corresponding to the rising portion of the inner panel, the appearance quality is lowered like a concave shape on the outer surface of the outer panel. Deformation can be prevented.

On the other hand, by making such an adhesive accommodating space adjacent to the bonding region, it is not necessary to excessively separate the edge portion from the rising portion, so that the width of the edge portion can be minimized.
Therefore, according to the present invention, it is possible to reduce the width on the edge side while preventing the appearance quality from deteriorating due to the temperature change on the smooth surface of the outer panel.

It is a fragmentary sectional view of the resin back door in 1st Embodiment of this invention, and is equivalent to the AA cross section of FIG. It is a perspective view which shows an example of resin-made back doors. It is a fragmentary sectional view of the resin back door in a prior art example, and shows the state before hardening of adhesives. It is a fragmentary sectional view of the resin back door in a conventional example, and shows the state after hardening of an adhesive.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2. Here, description will be made using an example in which the resin panel joining structure of the present invention is applied to a resin back door.
As shown in FIG. 2, the resin back door 10 of the present embodiment is attached to the rear opening at the rear of the vehicle body so as to be freely opened and closed, and is disposed on the vehicle interior side of the resin outer panel 11 and the outer panel 11. And an inner panel 12 made of resin.
The outer panel 11 and the inner panel 12 are formed in an appropriate shape from the viewpoints of the design and strength on the vehicle exterior side and the vehicle compartment side. Here, the panels 11 and 12 are each formed from a single resin molded body. ing.

As shown in FIG. 1, the resin back door 10 includes an adhesive region 21 a set at the edge 21 of the resin outer panel 11 and an adhesive region 31 a set at the edge 31 of the resin inner panel 12. Are bonded to each other by an adhesive 13.
In the interior between the inner panel 12 and the outer panel 11, a metal reinforcement or the like (not shown) may be appropriately disposed, but in FIG. 1, the inner panel is located at a portion where the reinforcement is not disposed. 12 shows a portion where the outer panel 11 and the outer panel 11 are directly bonded.

The outer panel 11 is provided with an outer surface 22 that constitutes the appearance of the vehicle body. The outer surface 22 is a smooth surface 22a in a wide range. The smooth surface 22a may be a flat surface or a curved surface in which a bent portion having a small curvature is not provided.
The inner surface on the passenger compartment side in the vicinity of the periphery of the outer panel 11 is formed smoothly like the outer surface 22, and the edge 21 and the portion adjacent to the edge 21 are formed continuously and smoothly without partitioning. Yes. In addition, the rib 23 is continuously provided in the longitudinal direction along the edge part 21 at the end edge.

  The inner panel 12 is provided with a smooth edge 31 that is disposed substantially parallel to the edge 21 of the outer panel 11. A stopper 32 is provided at the edge of the edge 31 to keep a predetermined distance between the adhesive region 21a of the edge 21 and the adhesive region 31a of the edge 31 by contacting the edge 21 of the outer panel 11. ing. This interval is an adhesion interval at which the adhesive 13 is disposed.

A rising portion 33 that rises in a direction away from the outer panel 11 is provided in the vicinity of the edge portion 31, and a bent portion 34 is provided between the edge portion 31 and the rising portion 33. The rising portion 33, the bent portion 34, and the edge portion 31 are provided continuously in the longitudinal direction, and are disposed at positions corresponding to the smooth surface 22 a of the outer panel 11. Note that a trim portion (not shown) may be provided on the passenger compartment side of the rising portion 33.
The stopper 32, the edge portion 31, the bent portion 34, the rising portion 33, and the trim portion are integrally formed of a resin, and the whole has a shape that can be molded by a molding die.

  The angle between the edge portion 31 and the rising portion 33 can be set as appropriate. Here, the edge 31 and the rising portion 33 are substantially perpendicular to each other. The bent portion 34 connects the edge portion 31 and the rising portion 33 so as to maintain an angle between them.

  The outer surface of the bent portion 34 protrudes outward and the inner surface is recessed outward. On the outer surface of the bent portion 34, a constricted portion 36 formed continuously in a streak shape along the longitudinal direction of the bent portion 34 is provided. In this embodiment, the constricted portion 36 is provided at a position adjacent to the rising portion 33.

  Between the constricted portion 36 and the inner surface of the bent portion 34, a weak body portion 35 having a thickness smaller than that of the rising portion 33 is provided. The weak body portion 35 is further thinner than the edge portion 31. The weak body portion 35 is continuously formed in the longitudinal direction along the bent portion 34.

On the inner surface of the bent portion 34, a recessed portion 41 that is recessed outward is formed continuously along the longitudinal direction of the bent portion 34, and is inclined with respect to the outer panel 11 at an angle smaller than that of the rising portion 33. Two inclined surfaces 38 are provided. The dent 41 is provided with a crease 41a that is recessed outward.
This inner surface has an outer surface in the entire range from the adjacent position of each edge 21, 31 to the rising portion 33 with the edge 21 of the outer panel 11 and the edge 31 of the inner panel 12 facing each other. It is arranged away from the panel 11. And the position adjacent to the adhesion areas 21a, 31a on the adhesion area 21a, 31a side from the weak body 35 between the inner surface of the recess 41 of the bent part 34 and the outer panel 11 is from the adhesion areas 21a, 31a. An adhesive accommodating space 39 for accommodating the protruding adhesive 13 is formed.

  Although the resin which comprises such an outer panel 11 and the inner panel 12 can be selected suitably, for example, a polypropylene resin, a nylon resin, a composite reinforced resin etc. can be illustrated. This resin may contain glass fibers or the like. In this embodiment, a polypropylene resin is used.

  The adhesive 13 for adhering the edge 21 of the outer panel 11 and the edge 31 of the inner panel 12 can be appropriately selected as long as they can be bonded with sufficient strength. For example, a urethane-based adhesive or an epoxy-based adhesive can be selected. An adhesive agent etc. can be illustrated. In this embodiment, a urethane-based adhesive that accelerates curing by heating is used.

Next, a method for manufacturing such a resin back door 10 will be described.
In order to manufacture this resin back door 10, an outer panel 11 and an inner panel 12 molded in the shape as described above are prepared. In these, members arranged between the outer panel 11 and the inner panel 12 are arranged as necessary.

  Next, the uncured adhesive 13 is applied to either the bonding region 21 a of the edge 21 in the outer panel 11 or the bonding region 31 a of the edge 31 in the inner panel 12.

  As shown in FIG. 1, the bonding regions 21 a and 31 a of both the edge portions 21 and 31 are opposed to each other, and the stopper 32 of the inner panel 12 is brought into contact with the edge portion 21 of the outer panel 11 to be temporarily bonded. At this time, the outer shapes of the outer panel 11 and the inner panel 12 are maintained.

  Then, the adhesive agent 13 is hardened by heating these. At this time, the edge 21 of the outer panel 11 and the edge 31 of the inner panel 12 are bonded together with the curing of the adhesive, but the outer panel 11 and the inner panel 12 are thermally expanded due to temperature changes. The panels 11 and 12 are deformed with different deformation amounts based on their shapes and the like. For example, it expands and contracts by different amounts in the surface direction.

  Since the edge 21 of the outer panel 11 and the edge 31 of the inner panel 12 cannot move relative to each other, the adhesive strength increases. Therefore, the outer panel 11 and the inner panel 12 are deformed by the difference in deformation due to the temperature change. Distortion is generated between the edge portion 21 and the edge portion 31 of the inner panel 12 to increase the internal stress.

  Then, as shown in FIG. 1, the weak portion 35 provided in the inner panel 12 causes the edge 21 of the outer panel 11 and the edge 31 of the inner panel 12 to rise from the rising portion 33 of the inner panel 12 according to the internal stress. It deforms in the direction of falling against. Due to this deformation, distortion due to temperature change is absorbed, and the outer panel 11 is gently curved. As in the prior art, no concave deformation occurs on the smooth surface of the outer panel 11 in the vicinity of the rising portion 33.

After the adhesive is sufficiently cured, the temperature is lowered and taken out, and after-treatment is performed if necessary, and another member is appropriately disposed to obtain the resin back door 10.
The resin back door 10 obtained in this way is used by being mounted on the rear opening at the rear of the vehicle body so as to be freely opened and closed. Even during this use, different deformations occur in the outer panel 11 and the inner panel 12 in accordance with the temperature change. Even in this deformation, the edge 21 of the outer panel 11 and the edge 31 of the inner panel 12 are raised portions 33 of the inner panel 12. The distortion is absorbed by the deformation.

  According to the resin back door 10 as described above, the adhesive accommodating space 39 is provided adjacent to the adhesive regions 21a and 31a between the recessed portion 41 formed on the inner surface of the bent portion 34 and the outer panel 11. It has been. Therefore, the adhesive 13 protruding from the adhesive regions 21a and 31a when the edge 21 of the outer panel 11 and the edge 31 of the inner panel 12 are bonded is stored in the adhesive storage space 39, and the adhesive 13 is bent. It does not spread excessively between the inner surface of the portion 34 and the outer panel 11 and reaches the vicinity of the rising portion 33. Thereby, in the inner panel 12, it can prevent that the softness | flexibility of the edge part 31 with respect to the standing part 33 falls.

  In particular, the constricted portion 36 is provided in the bent portion 34, and the weak body portion 35 thinner than the thickness of the raised portion 33 is formed between the constricted portion 36 and the inner surface of the bent portion 34. The edge 31 is easily deformed in the direction of falling with respect to 33. Moreover, since the constricted portion 36 is provided on the outer surface side of the bent portion 34, there is no possibility that the adhesive 13 protruding from the adhesive regions 21a and 31a enters the constricted portion 36 and is cured.

  Moreover, since the adhesive accommodating space 39 is provided by the recess 41, the adhesive accommodating space 39 can be secured large, and the adhesive 13 protruding from the adhesive regions 21a and 31a of the edge portions 21 and 31 is accommodated in a narrower range. can do. Here, since the crease 41a is provided in the dent 41 toward the outer surface, the crease 41a can effectively prevent the adhesive 13 from moving toward the rising portion 33.

Therefore, the flexibility of the edge parts 21 and 31 with respect to the rising part 33 can be ensured, and the outer panel 11 and the inner panel are changed by temperature change in a state where the edge part 21 of the outer panel 11 and the edge part 31 of the inner panel 12 are bonded. Even if the amount of thermal expansion or contraction different from that in FIG. 12 occurs, the distortion can be absorbed by the deformation of both edge portions 21 and 31. Therefore, it is possible to prevent only the outer panel 11 from being deformed due to a temperature change at the time of manufacture or use, and appearance quality like a concave shape on the outer surface of the outer panel 11 at a position corresponding to the rising portion 33 of the inner panel 12. It is possible to prevent the occurrence of deformation that lowers.
On the other hand, since the adhesive accommodating space 39 is adjacent to the adhesive regions 21a and 31a, the width of the edge portions 21 and 31 can be minimized.

  Therefore, in the resin back door 10, it is possible to prevent deterioration in appearance quality due to temperature change on the smooth surface of the outer panel 11 while ensuring desired rigidity. As a result, it is possible to narrow the width on the side of the edge portions 21 and 31 as compared with the conventional case, and to secure a wider rear opening of the vehicle body.

Each of the above embodiments can be appropriately changed within the scope of the present invention.
For example, in each of the above-described embodiments, the example of the resin back door has been described as the resin panel bonding structure, but is not particularly limited. The present invention can be applied in exactly the same manner as in each of the above embodiments as long as the resin outer panel having a predetermined shape and the resin inner panel having a predetermined shape are bonded to each other by an adhesive at the edge. . Examples of such a panel include a roof panel, various hood panels, various door panels, and the like.

  In the above, the example in which the outer panel 11 and the inner panel 12 are each composed of a single resin molded body has been described. However, the outer panel 11 and the inner panel 12 may each be composed of a plurality of sheets.

10 resin back door 11 outer panel 12 inner panel 13 adhesive 21 edge 21a adhesion area 22 outer surface 22a smooth surface 23 rib 31 edge 31a adhesion area 32 stopper 33 rising part 34 bending part 35 weak body part 36 constriction part 38 inclination Surface 39 Adhesive accommodating space 41 Recessed portion 41a Bending line

Claims (4)

The bonding structure of the resin panel in which the bonding area of the edge in the resin outer panel and the bonding area of the edge in the resin inner panel are bonded to each other,
The inner panel includes
A rising portion that rises in a direction away from the smooth surface of the outer panel;
A bent portion disposed between the rising portion and the edge of the inner panel and inclined at an angle smaller than the rising portion in a direction away from the smooth surface of the outer panel;
A constricted portion formed in a streak shape along the bent portion at a position adjacent to the rising portion of the bent portion;
Between the inner surface of the bent portion and the constricted portion, a weak body portion that is provided continuously in the longitudinal direction along the bent portion and has a thickness thinner than the rising portion and the edge portion;
Is provided,
An edge portion of the inner panel, the weak body portion, and the rising portion are provided integrally,
When thermal distortion occurs due to a difference in deformation amount due to a temperature change between the outer panel and the inner panel, an edge of the outer panel is formed by the weak body portion formed in a streak shape by the constricted portion of the bent portion. Absorbing the thermal strain by deforming with respect to the rising portion of the inner panel ,
Bonding structure of resin panels.   The resin panel bonding structure according to claim 1, wherein a concave portion is provided between the weak body portion and the edge portion, and the concave portion is provided in the concave portion toward the outer surface.   The resin panel bonding structure according to claim 2, wherein an adhesive is disposed on a part of the concave portion on the edge side. The resin panel joining structure according to any one of claims 1 to 3 , wherein the resin panel is a roof panel, a hood panel, or a door panel.

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