Vehicle back door

Abstract

To shorten manufacturing takt time, facilitate work for regulating both panels from separating in a thickness direction before an adhesive is cured, and reduce facility costs.SOLUTION: An opening-side peripheral wall part 37 is provided at an edge at an opening 15 side of an inner panel 5 protrudingly toward an outer panel 7 side, and a plurality of opening-side protruding piece parts 39 protruding toward inside of the inner panel is formed at a tip part of the opening-side peripheral wall part 37. A plurality of positioning / protruding wall parts 41 is provided at places slightly away from the edge of the opening 15 side of the inner panel 5 protrudingly toward the outer panel 7 side with intervals therebetween in a direction along the edge at the opening 15 side, so that parts 63f to be positioned are provided in an upper outer panel 7a. The opening-side protruding piece parts 39 of the upper outer panel 7a are engaged with the edge part at the opening 15 side of the upper outer panel 7a while overlapping with each other from a non-adhesion surface side of the upper outer panel 7a, and the positioning / protruding wall parts 41 of the inner panel 5 are caused to oppose to the parts 63f to be positioned, from the inside of the panel.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to a vehicle back door comprising an inner panel and an outer panel having a window opening, the outer periphery of both panels and the edge portions of the opening side being bonded together with an adhesive. [Background technology]

[0002] As a manufacturing method for a vehicle back door having a resin inner panel and a resin outer panel with a window opening, in which the outer peripheral side and the edge portion of the opening side of both panels are bonded with an adhesive, a method is known in which an adhesive is applied to the outer peripheral side and the edge portion of the opening side of the inner panel, the two panels are overlapped and adhered to each other, and then the two panels are held with a jig or the like so that they do not move relative to each other until the adhesive hardens. In this method, since the two panels are held with a jig or the like after they are overlapped and adhered to each other until the adhesive hardens, there is a problem that the next process, such as the assembly of other parts or transportation, cannot be performed.

[0003] Patent Document 1 discloses a method for manufacturing a vehicle back door that includes an inner panel and an outer panel having a window opening, and in which the outer peripheral side and the edge portion of the opening side of both panels are bonded with an adhesive. In this manufacturing method, adhesive is applied to the outer peripheral side and the edge portion of the opening side of the inner panel, and then the two panels are overlapped and closely attached to each other and laser-welded, thereby preventing the two panels from moving apart in the thickness direction before the adhesive hardens, and making it possible to carry out the next process before the adhesive hardens. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-185833 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in Patent Document 1, laser welding is performed to prevent the two panels from moving apart in the thickness direction before the adhesive hardens, so the work of preventing the two panels from moving apart in the thickness direction is time-consuming and requires the use of laser processing equipment, which increases equipment costs.

[0006] The present invention has been made in consideration of the above points, and its purpose is to shorten the manufacturing takt time of a vehicle tailgate by enabling the next process to be performed before the adhesive hardens, to facilitate the work of preventing the two panels from separating in the thickness direction before the adhesive hardens, and to reduce equipment costs. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a method for preventing both panels from moving apart in the thickness direction by providing a protruding piece on the edge of one panel and engaging the protruding piece with the edge of the other panel, and by providing a positioning protrusion on one panel and opposing the positioning protrusion to a part of the other panel from the inside or outside of the panel, the protruding piece of one panel is positioned outside the panel relative to the edge of the other panel. Zhou The feature of this invention is that it is possible to regulate the movement of the movable member to the side.

[0008] Specifically, the first invention is based on a vehicle tailgate having an inner panel and an outer panel with an opening for a window, with the outer periphery of both panels and the edge portions on the opening side bonded together with an adhesive, and the following solution is taken.

[0009] That is, in the first invention, a peripheral wall portion is provided at an edge of one of the inner panel and the outer panel, protruding toward the other panel, and a protruding piece portion is formed at a tip portion of the peripheral wall portion so as to protrude inwardly of the panel, and a plurality of positioning protrusions are provided at a position slightly away from the edge of one of the inner panel and the outer panel, protruding at intervals from each other in a direction along the edge toward the other panel, and a positioned portion is provided on the other panel, and the protruding piece portion of the one panel engages with the edge portion of the other panel in an overlapping state from the non-adhesive surface side of the other panel, thereby restricting the other panel from moving away from the one panel in the thickness direction, and the plurality of positioning protrusions of the one panel face the positioned portion of the other panel from the inside or outside of the panel, thereby allowing the protruding piece portion of the one panel to move outwardly relative to the edge portion of the other panel until it no longer overlaps with the edge portion of the other panel. Zhou The adhesive is restricted from moving toward the one panel side, and the adhesive extends along the edge of the one panel on the inner side of the panel relative to the peripheral wall portion.

[0010] The second invention is characterized in that, in the vehicle tailgate relating to the first invention, the peripheral wall portion is provided on the outer peripheral edge of the outer panel, and a standing wall portion protruding in a direction away from the outer panel is formed at a location slightly away from the outer peripheral edge of the inner panel, the multiple positioning protrusions protrude at a location slightly away from the outer peripheral edge of the outer panel, the positioned portion is the standing wall portion, and the adhesive extends outer circumferentially further than the multiple positioning protrusions.

[0011] The third invention is characterized in that, in the vehicle tailgate relating to the first or second invention, the peripheral wall portion is provided on the edge of the opening side of the inner panel, and a slit extending along the edge is formed at a location slightly away from the edge of the opening side of the outer panel, and a portion of the outer panel adjacent to the slit from the edge side forms a flexible portion that can bend toward the slit when there is no adhesive inside the slit, and the protruding piece portion engages with the flexible portion in an overlapping state from the non-adhesive surface side of the outer panel, thereby restricting the outer panel from moving away from the inner panel in the thickness direction, and the adhesive enters inside the slit and restricts the flexible portion from bending toward the slit side. Effect of the Invention

[0012] According to the first invention, by simply bringing the two panels close to each other and engaging the protruding piece of one panel with the edge of the other panel, the two panels can be prevented from moving apart in the thickness direction without laser welding. Therefore, the work of preventing the two panels from moving apart in the thickness direction before the adhesive hardens can be easily performed. In addition, since there is no need to use laser processing equipment, equipment costs can be reduced. In addition, since the next process can be performed before the adhesive hardens, the manufacturing takt time of the vehicle back door can be shortened.

[0013] Furthermore, since the positioning protrusion of one panel faces the positioned portion, the protruding piece of one panel is restricted from moving outward relative to the edge portion of the other panel, so that when a dimensional error occurs in which the dimensions of one panel are larger than the dimensions of the other panel due to variations in molding shrinkage rate or the like, the influence of the dimensional error occurring in the positional relationship between the protruding piece of the one panel and the edge portion of the other panel can be reduced by bending the one panel on the inner side of the positioning protrusion. Therefore, compared to a case in which the positioning protrusion and the positioned portion are not provided on both panels, the protruding piece of one panel can be more reliably engaged with the edge portion of the other panel, and poor adhesion caused by the two panels being separated in the thickness direction in the adhesive intervening region can be more reliably prevented.

[0014] Furthermore, since a peripheral wall portion is provided on the edge of one of the panels, the peripheral wall portion can prevent the adhesive from spilling out to the outside of the panels in the process of bringing the two panels closer together and spreading the adhesive.

[0015] According to the second invention, the protruding piece portion of the outer panel can be easily engaged with the outer peripheral edge portion of the inner panel by pressing the protruding piece portion of the outer panel against the outer peripheral edge portion of the inner panel and bending the area of ​​the outer panel further toward the outer peripheral side than the positioning protrusion toward the opposite inner panel.

[0016] According to the third aspect of the present invention, the adhesive enters the inside of the slit and restricts the flexible portion from bending toward the slit, so that the engagement state of the protruding piece with the flexible portion can be reliably maintained, and therefore poor adhesion caused by the two panels being separated in the thickness direction in the adhesive-containing region can be more reliably prevented. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is an exploded perspective view of a vehicle back door according to a first embodiment of the present invention. [Diagram 2] 2 is a perspective view of an inner panel constituting a back door, as viewed from the rear of the vehicle. FIG. [Diagram 3] FIG. 2 is a perspective view of the inner panel and the outer panel as viewed from the rear of the vehicle. [Figure 4] 4 is a view of the back door as seen in the direction of arrow IV in FIG. 3. [Diagram 5] 5 is a cross-sectional view taken along line VV in FIG. 4. [Figure 6] 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 4 is an exploded perspective view of the back door with the periphery of the positioning protrusion of the outer panel cut away; [Figure 8] 4 is a perspective view of the back door with the periphery of a positioning protrusion of the outer panel cut away; FIG. [Figure 9] IX is a view of the back door as seen from the direction of arrow IX in FIG. [Figure 10] 10 is a cross-sectional view taken along line XX in FIG. 9. [Figure 11] 10 is a cross-sectional view taken along line XI-XI in FIG. 9. [Figure 12] 4 is a view of the back door as seen from the direction of arrow XII in FIG. 3. [Figure 13] 14 is an exploded cross-sectional view corresponding to the line XIV-XIV in FIG. 12. [Figure 14] 14 is a cross-sectional view taken along line XIV-XIV in FIG. 12. [Figure 15] FIG. 13 is an enlarged view of a portion XV in FIG. [Figure 16] 16 is a cross-sectional view taken along line XVI-XVI in FIG. 15. [Figure 17] 4 is a view of the back door as seen from the direction of the arrow XVII in FIG. 3. [Figure 18] 18 is a cross-sectional view taken along line XVIII-XVIII in FIG. 17. [Figure 19] 19 is a cross-sectional view taken along line XIX-XIX in FIG. 17. [Figure 20] FIG. 7 is a view equivalent to FIG. 6 of the second embodiment. [Figure 21] 21 is a view of the back door as seen in the direction of arrow XXI in FIG. 20. [Figure 22] 22 is a cross-sectional view taken along line XXII-XXII in FIG. 21. [Diagram 23] 23 is a cross-sectional view taken along line XXIII-XXIII in FIG. 21. [Figure 24] FIG. 4 is a perspective view of the inner panel, with the claw portion and the periphery of the insertion hole cut away; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following embodiment, for convenience of explanation, the front side in the longitudinal direction of the vehicle will be referred to as "front", the rear side will be referred to as "rear", the left side in the vehicle width direction facing the front of the vehicle will be referred to as "left", the right side will be referred to as "right", the upper side in the vehicle height direction will be referred to as "upper", and the lower side will be referred to as "lower". In addition, the back door according to this embodiment will be described assuming a posture in which the back door opening at the rear of the vehicle is closed, unless otherwise specified with respect to the open / closed state.

[0019] First Embodiment 1 shows a vehicle back door 1 according to a first embodiment of the present invention. This back door 1 is a back door of the type that opens and closes a door opening provided at the rear end of the body of a hatchback vehicle.

[0020] The back door 1 comprises a resin inner panel 5 located on the inside of the vehicle, a resin outer panel 7 located on the outside of the vehicle, a window panel 9, and a pair of lamp units 11 (only one of the lamp units is shown in Figure 1).

[0021] The inner panel 5 is a single panel molded by injection molding or the like, and is made of a thermoplastic resin such as polypropylene (PP) containing fiber reinforcing materials such as glass fiber (GF), carbon fiber (CF), and cellulose nanofiber.

[0022] As shown in Figs. 2 and 3, the inner panel 5 faces the outer panel 7 and has a substantially plate-shaped panel body 13 that constitutes the main body of the inner panel 5. A substantially rectangular window opening 15 extending in the vehicle width direction is formed in the upper half of the panel body 13. The panel body 13 has a portion below the opening 15 (hereinafter referred to as the "lower half") with its plate surface facing substantially in the front-rear direction. The panel body 13 has a portion above the opening 15 that is inclined upward and forward. Hereinafter, the outer periphery of both panels 5 and 7 and the inner periphery of the opening 15 are referred to as the "panel outer side", and the inner periphery of both panels 5 and 7 and the outer periphery of the opening 15 are referred to as the "panel inner side".

[0023] A bulging portion 13a, which is elongated in the vehicle width direction and has a generally rectangular shape in a plan view and bulges toward the outer panel 7 (rear side) is formed near the lower end edge of the opening 15 at the center in the vehicle width direction of the panel main body 13 of the inner panel 5. A first opening 13b for attaching a lamp for illuminating a license plate, which is accommodated on the interior side of the bulging portion 13a, and a second opening 13c for attaching a switch for releasing the opening / closing lock of the vehicle back door 1 are formed on the end face of the bulging portion 13a on the outer panel 7 side.

[0024] As shown in Figs. 4 to 11, an outer peripheral side standing wall portion 17 is provided around the entire circumference as a positioned portion rising toward the outer panel 7 at the outer peripheral side edge of the panel main body portion 13 of the inner panel 5. A plate-shaped outer flange portion 19 for joining is formed at the rear end of the outer peripheral side standing wall portion 17 so as to protrude toward the outer peripheral side, and this outer flange portion 19 constitutes the outer peripheral side edge portion of the inner panel 5. Therefore, the outer peripheral side standing wall portion 17 protrudes in a direction away from the outer panel 7 beyond the outer peripheral side edge portion of the inner panel 5 at a location slightly away from the outer peripheral side edge of the inner panel 5. At a position lower than the tip of the inner peripheral surface of the outer peripheral side standing wall portion 17 toward the side opposite to the outer panel 7, a guide wall portion 21 bent in a substantially L-shaped cross section is provided to protrude so as to form an insertion space S opened toward the outer panel 7 side between the outer peripheral side standing wall portion 17 and the outer peripheral side standing wall portion 17. The tip side of the bent portion of the guide wall portion 21 faces the outer peripheral side standing wall portion 17 from the inner peripheral side, and is inclined inwardly toward the tip side so as to be separated from the outer peripheral side standing wall portion 17 toward the outer panel 7. The outer peripheral side standing wall portion 17 and each guide wall portion 21 are connected by a connecting wall portion 23 as shown in Fig. 7 and Fig. 8. Screw holes 17a for hinge attachment are formed near both ends in the vehicle width direction of the outer peripheral side standing wall portion 17 extending in the vehicle width direction at the outer peripheral side edge of the upper side of the panel main body portion 13 as shown in Fig. 9, and a plurality of insertion holes 17b for inserting wiring for a stop lamp or the like are formed in the middle in the vehicle width direction of the outer peripheral side standing wall portion 17 extending in the vehicle width direction at the outer peripheral side edge of the upper side of the panel main body portion 13.

[0025] An opening-side standing wall portion 25 rising toward the outer panel 7 is provided along the entire periphery of the edge of the panel main body portion 13 of the inner panel 5 on the opening 15 side, except for the portion where the bulge 13a is formed. Therefore, a recess 27 recessed toward the side opposite the outer panel 7 is formed by the panel main body portion 13 of the inner panel 5, the outer periphery-side standing wall portion 17, and the opening-side standing wall portion 25.

[0026] A plurality of first protrusions 29 that protrude diagonally outwardly towards the outer panel 7 are formed at intervals in the circumferential direction on the outer peripheral edge of the outer flange portion 19 of the inner panel 5 on both sides in the vehicle width direction of the upper and lower ends and on the lower side. The first protrusions 29 are disposed at positions circumferentially spaced from the guide wall portion 21. Second protrusions 31 that protrude approximately perpendicularly towards the outer panel 7 are formed in the portions of the outer peripheral edge of the outer flange portion 19 of the inner panel 5 where the first protrusions 29 are not formed.

[0027] A plate-shaped opening upper end flange portion 33 having a plate surface facing obliquely upward toward the rear is provided at the rear end of a portion of the opening-side standing wall portion 25 extending in the vehicle width direction above the opening 15 so as to protrude inwardly into the opening 15. An opening lower end flange portion 35 having a plate surface facing obliquely upward toward the rear is provided continuously so as to protrude inwardly into the opening 15 at a portion of the opening-side standing wall portion 25 extending in the vehicle width direction below the opening 15 and at the upper end of the bulging portion 13a.

[0028] As shown in Figs. 12 to 14, an opening-side peripheral wall 37 is provided at the edge (lower edge) of the opening upper flange 33 on the opening 15 side, protruding over the entire circumferential direction toward the outer panel 7 side (diagonally upward toward the rear). At the tip of the opening-side peripheral wall 37, a plurality of opening-side protruding pieces 39 protruding toward the inside of the panel (the outer periphery of the opening 15), i.e., diagonally upward toward the front, are formed at intervals in the circumferential direction of the opening 15 (vehicle width direction). In addition, at a location slightly above the edge of the opening upper flange 33 on the opening 15 side, as shown in Figs. 15 and 16, positioning protruding wall portions 41 as a plurality of rectangular plate-shaped positioning protrusions with plate surfaces facing inwardly of the opening 15 are provided at intervals toward the outer panel 7 side in a direction along the upper edge of the opening 15 (vehicle width direction). The center portion in the vehicle width direction of each positioning protruding wall portion 41 is connected to the opening side peripheral wall portion 37 by a plate-shaped connecting rib 43 whose plate surface faces in the vehicle width direction.

[0029] As shown in Figs. 18 and 19, a plurality of first extending wall portions 45 extending forward are formed at intervals in a direction along the lower edge of the opening 15 (vehicle width direction) at the edge (upper edge) of the opening lower end flange portion 35 on the opening 15 side. As shown in Fig. 17, a rectangular protruding wall portion 47 long in the vehicle width direction is protruded upward from the tip of the first extending wall portion 45. A first rectangular through hole 47a long in the vehicle width direction is formed through the protruding wall portion 47. A second extending wall portion 49 is formed at the same inclination as the opening lower end flange portion 35 at a location where the first extending wall portion 45 is not formed at the edge (upper edge) of the opening lower end flange portion 35 on the opening 15 side. A plurality of second rectangular through holes 49a long in the vehicle width direction are formed through the second extending wall portion 49.

[0030] 1 and 2, a plurality of plate-shaped upper reinforcement ribs 51a with their plate surfaces facing in the vehicle width direction are provided on the panel main body 13 above the opening 15 of the inner panel 5, protruding toward the outer panel 7, and each of the upper reinforcement ribs 51a is connected to the outer periphery side standing wall portion 17 and the opening side standing wall portion 25. A plurality of plate-shaped lower reinforcement ribs 51b with their plate surfaces facing in the vehicle width direction are provided on the lower end of the panel main body 13, protruding toward the outer panel 7, and each of the lower reinforcement ribs 51b is connected to the outer periphery side standing wall portion 17.

[0031] The outer panel 7 is divided into two parts, an upper outer panel 7a located on the upper side and a lower outer panel 7b located on the lower side. The upper outer panel 7a and the lower outer panel 7b are each a single panel molded by injection molding or the like, and are made of synthetic resin such as talc-containing polypropylene (PP-T: Polypropylene Talc) or a mixture of PP-T and ethylene propylene diene methylene rubber (EPDM: Ethylene Propylene Diene Monomer).

[0032] The upper outer panel 7a faces a portion of the inner panel 5 above the opening 15 and portions of an upper end portion of the opening 15 on both sides in the vehicle width direction.

[0033] The upper outer panel 7a has an upper body 53 with its plate surface facing the inner panel 5. As shown in FIG. 11, a plurality of upper peripheral wall portions 55 extending in the circumferential direction (vehicle width direction) are provided at the edge of the upper body 53 (outer periphery) to protrude toward the inner panel 5 side (lower side) at intervals from each other in the circumferential direction (vehicle width direction). An upper protruding piece portion 57 protruding obliquely downward toward the inside of the panel (the inner periphery side of the upper outer panel 7a (left side in FIG. 11)) is formed at the tip of the upper peripheral wall portion 55. As shown in FIG. 10, at a position slightly away from the edge of the upper outer panel 7a (outer periphery) to the inner periphery, a plurality of upper positioning ribs 59 as plate-shaped positioning protrusions with their plate surfaces facing in the direction along the edge (vehicle width direction) are provided at intervals from each other in the direction along the edge (vehicle width direction) to protrude toward the inner panel 5 side (lower side). A distance D1 between the upper edge of the upper body portion 53 and the upper positioning rib 59 is set to 20 to 30 mm. The upper positioning rib 59 is disposed at a different position in the circumferential direction (vehicle width direction) from the upper peripheral wall portion 55 and the upper protruding piece portion 57.

[0034] As shown in Figs. 12 to 14 and 16, a lower side wall 61 is formed on the lower edge of the upper body 53 of the upper outer panel 7a, protruding toward the inner panel 5 (diagonally forward toward the lower side), and a plate-shaped upper flange 63 is formed on the lower end of the lower side wall 61, located closer to the inner panel 5 than the upper body 53, so as to protrude inwardly into the opening 15. At a location slightly away from the lower edge (opening 15 side) of the upper flange 63, i.e., at a location slightly away from the edge of the opening 15 side of the upper outer panel 7a, a plurality of slits 63a extending along the edge are formed at intervals from each other in a direction along the edge. A portion of the upper flange 63 adjacent to the slit 63a from the edge side constitutes a flexible portion 63b that can bend toward the slit 63a when there is no first adhesive AD1 described later inside the slit 63a. A positioned hole 63c having a substantially T-shape in plan view is formed at the lower end of the upper flange portion 63. The positioned hole 63c is composed of a plurality of rectangular first long hole portions 63d extending in the vehicle width direction along the edge of the upper flange portion 63 on the opening 15 side with a slight gap between the edge and the first long hole portion 63d, and a second long hole portion 63e extending vertically from the center of the first long hole portion 63d in the vehicle width direction to the edge. Portions of the second long hole portion 63e in the upper flange portion 63 on both sides in the vehicle width direction facing the first long hole portion 63d from the opening 15 side constitute positioned portions 63f.

[0035] A stop lamp mounting recess 64 extending in the vehicle width direction is formed at an end of the upper side main body portion 53 of the upper outer panel 7a on the opening 15 side in the center in the vehicle width direction.

[0036] The lower outer panel 7b faces a portion of the inner panel 5 below the opening 15 and portions of a lower end portion of the opening 15 on both sides in the vehicle width direction.

[0037] The lower outer panel 7b includes a lower-side main body portion 65 which constitutes the main body thereof. As shown in Figs. 17 to 19, an inclined surface portion 67 inclined upward and forward is provided on the upper edge of the lower-side main body portion 65 over the entire vehicle width direction, and a plate-shaped lower-side flange portion 69 located closer to the inner panel 5 (front side) than the lower-side main body portion 65 is formed on the upper side of the inclined surface portion 67 so as to protrude inwardly into the opening 15. On the edge (upper edge) on the opening 15 side of the lower-side flange portion 69, a plurality of plate-shaped insertion pieces 71 with their plate surfaces facing substantially in the vertical direction are provided at intervals from each other in the vehicle width direction toward the inner panel 5 (front side). A claw portion 73 protruding upward is formed on the tip portion of some of the insertion pieces 71.

[0038] A lamp unit mounting recess 65a is formed at the upper end of both ends in the vehicle width direction of the lower main body portion 65 so as to be recessed forward from the region below the lamp unit mounting recess 65a. A license plate mounting recess 65b is formed above the vertical center of the vehicle width direction central portion of the lower main body portion 65 so as to be recessed forward from the region below the license plate mounting recess 65b.

[0039] As shown in Figs. 4 and 5, a plurality of lower peripheral wall portions 75 extending in the circumferential direction are provided at intervals from each other on the edge of both sides and the lower side (outer peripheral side) of the lower main body portion 65 in the vehicle width direction except for the portion where the lamp unit mounting recess 65a is formed, and protrude toward the inner panel 5 side (front side). The lower peripheral wall portion 75 is inclined toward the outer peripheral side toward the tip side. A lower protruding piece portion 77 is formed at the tip of the lower peripheral wall portion 75, and protrudes toward the inner panel 5 side at an incline toward the panel inner side (inner peripheral side, right side in Fig. 5). At a position slightly away from the edge (outer peripheral side edge) of both sides and the lower side in the vehicle width direction except for the portion where the lamp unit mounting recess 65a is formed, the lower positioning ribs 79 as a plurality of plate-shaped positioning protrusions with plate surfaces facing in a direction along the edge are provided at intervals from each other and protrude toward the inner panel 5 side in a direction along the edge. A distance D2 (see FIG. 6) between the outer peripheral edge of the lower main body portion 65 and the lower positioning rib 79 is set to 20 to 30 mm. Three adjacent lower positioning ribs 79 are adjacent to each other in groups of three. The lower positioning ribs 79 are disposed at positions spaced apart from the lower peripheral wall portion 75 and the lower protruding piece portion 77 in the circumferential direction.

[0040] The window panel 9 is a horizontally long panel that extends across the entire width of the back door 1. The window panel 9 is made of a transparent resin such as polycarbonate (PC), glass, or the like.

[0041] The upper outer panel 7a configured as described above is assembled to the inner panel 5 from an obliquely upward rear direction with the upper side main body portion 53 facing the inner panel 5 above the opening 15. The upper side and both sides in the vehicle width direction of the upper outer panel 7a, i.e., the edge portion on the outer periphery side, are bonded to the outer flange portion 19 of the inner panel 5, i.e., the edge portion on the outer periphery side, via a first adhesive AD1, and the upper side flange portion 63 of the upper outer panel 7a, i.e., the edge portion on the opening 15 side, is bonded to the opening upper end side flange portion 33 of the inner panel 5, i.e., the edge portion on the opening 15 side, via the first adhesive AD1.

[0042] The first adhesive AD1 may be a urethane adhesive, an epoxy adhesive, etc. The first adhesive AD1 may be either a two-part adhesive made of a base agent and a curing agent, or a one-part adhesive made of only a base agent.

[0043] 2, the application area of ​​the first adhesive AD1 on the inner panel 5 is indicated by a virtual line. Therefore, the first adhesive AD1 extends along the upper edge of the upper outer panel 7a on the inner side of the upper peripheral wall portion 55 (on the inner side of the panel) and on the outer side of the upper positioning rib 59, and also extends along the edge of the upper outer panel 7a on the opening 15 side on the outer side of the opening 15 on the opening-side peripheral wall portion 37 (on the inner side of the panel).

[0044] In this state, as shown in Fig. 11, the upper protruding piece 57 of the upper outer panel 7a engages with the first protruding strip 29 (edge ​​portion on the outer periphery side) of the inner panel 5 in an overlapping state from the non-adhesive surface side (lower side in Fig. 11) of the inner panel 5, thereby restricting the outer flange portion 19 of the inner panel 5 from moving away in the thickness direction from the upper main body portion 53 of the upper outer panel 7a. Meanwhile, as shown in Fig. 10, the upper edge portion of the upper main body portion 53 of the upper outer panel 7a and the tip surface of the second protruding strip 31 of the inner panel 5 face each other with a gap therebetween in the thickness direction. Also, the upper positioning rib 59 of the upper outer panel 7a is inserted into an insertion space S between the guide wall portion 21 formed near the upper edge of the inner panel 5 and the outer periphery standing wall portion 17. The upper positioning rib 59 of the upper outer panel 7a faces the outer peripheral side standing wall portion 17 of the inner panel 5 from the inner peripheral side (inner side of the panel, left side in Figure 10), thereby restricting the upper protruding piece portion 57 of the upper outer panel 7a from moving relatively to the outer peripheral side (outer side of the panel) with respect to the upper edge portion of the inner panel 5 until it no longer overlaps with the first protrusion portion (upper (outer peripheral) edge portion) 29 of the inner panel 5.

[0045] 12 and 14, the opening-side protruding piece 39 of the inner panel 5 engages with the flexible portion 63b of the upper outer panel 7a in an overlapping state from the non-adhesive surface side (diagonally upper left side in FIG. 14) of the upper outer panel 7a, thereby restricting the upper-side flange portion 63 of the upper outer panel 7a from moving away in the thickness direction from the opening upper end side flange portion 33 of the inner panel 5. In addition, the first adhesive AD1, when it penetrates into the inside of the slit 63a and hardens, restricts the flexible portion 63b from bending toward the slit 63a. Furthermore, when the positioning protruding wall portion 41 of the inner panel 5 is inserted into the first long hole portion 63d of the upper outer panel 7a, it faces the positioned portion 63f from the outer periphery side of the opening 15 (the inner side of the panel, diagonally upper right side in Figure 16), thereby restricting the opening side protruding piece portion 39 of the inner panel 5 from moving inside the opening 15 (outside the panel) relative to the upper edge portion of the opening 15 of the upper outer panel 7a until it no longer overlaps with the flexible portion 63b of the upper outer panel 7a.

[0046] On the other hand, the lower outer panel 7b is assembled to the inner panel 5 from the rear in a state in which the lower side main body portion 65 faces the inner panel 5 below the opening 15. A lower side flange portion 69 of the lower outer panel 7b, i.e., an edge portion on the opening 15 side, and an opening lower end side flange portion 35 of the inner panel 5, i.e., an edge portion on the opening 15 side, are bonded via an adhesive AD1, and a lower side and both sides in the vehicle width direction, i.e., an edge portion on the outer periphery side, of the lower outer panel 7b and an outer flange portion 19 of the inner panel 5, i.e., an edge portion on the outer periphery side, are bonded via a first adhesive AD1. Therefore, the first adhesive AD1 extends along the outer periphery side edge of the lower outer panel 7b on the inner periphery side (panel inner side) of the lower peripheral wall portion 75 and on the outer periphery side of the lower positioning rib 79. Additionally, the portion of the lower outer panel 7b above the license plate attachment recess 65b is adhered to the outer periphery of the end face of the bulging portion 13a of the inner panel 5 via a first adhesive AD1.

[0047] 17 to 19, in this state, the insertion piece portion 71 of the lower outer panel 7b is inserted into the first and second through holes 47a, 49a of the inner panel 5. The claw portion 73 engages with the peripheral edge of the first through hole 47a, thereby preventing the insertion piece portion 71 from coming out of the first through hole 47a.

[0048] As shown in Fig. 5, the lower protruding piece 77 of the lower outer panel 7b is engaged with the first protruding strip 29 of the inner panel 5 in an overlapping state from the non-adhesive surface side (lower side in Fig. 5) of the inner panel 5, thereby restricting the outer flange 19 of the inner panel 5 from moving away in the thickness direction from the lower main body 65 of the lower outer panel 7b. Meanwhile, as shown in Fig. 6, the outer peripheral edge of the lower main body 65 of the lower outer panel 7b and the tip surface of the second protruding strip 31 of the inner panel 5 face each other with a gap in the thickness direction. As shown in Figs. 6 to 8, the lower positioning ribs 79 of the lower outer panel 7b are inserted into insertion spaces S between the guide wall 21 and the outer peripheral standing wall 17 formed near the upper and both ends of the inner panel 5 in the vehicle width direction for every three lower positioning ribs 79 that are close to each other. The lower positioning rib 79 of the lower outer panel 7b faces the outer peripheral side standing wall portion 17 of the inner panel 5 from the inner peripheral side (inside of the panel, right side in Figure 6), thereby restricting the lower protruding piece portion 77 of the lower outer panel 7b from moving toward the outer peripheral side (outside of the panel) relative to the outer peripheral edge portion of the inner panel 5 until it no longer overlaps with the first protrusion portion (outer peripheral edge portion) 29 of the inner panel 5.

[0049] Further, the outer periphery of the window panel 9 is adhered via a second adhesive AD2 made of a urethane adhesive or the like to the upper flange portion 63 of the upper outer panel 7a, the lower flange portion 69 of the lower outer panel 7b, and the portions of the outer flange portions 19 on both sides of the opening 15 of the inner panel 5 in the vehicle width direction that are not covered by the outer panel 7. Therefore, the slits 63a and the first elongated hole portions 63d in the upper flange portion 63 of the upper outer panel 7a, the opening-side peripheral wall portion 37 and the opening-side protruding piece portion 39 of the inner panel 5, the insertion piece portion 71 and the claw portion 73 of the lower outer panel 7b, and the first extending wall portion 45, the protruding wall portion 47, and the second extending wall portion 49 of the inner panel 5 are covered from the rear by the window panel 9.

[0050] Furthermore, the lamp unit 11 is attached to the lamp unit attachment recess 65a of the lower outer panel 7b.

[0051] To assemble the inner panel 5, upper outer panel 7a, lower outer panel 7b, and window panel 9 configured as described above, first, a first adhesive AD1 is applied to the outer periphery of the outer flange portion 19 of the inner panel 5, the opening upper end flange portion 33, the opening lower end flange portion 35, and the end face of the bulge portion 13a.

[0052] Then, the outer peripheral (upper) edge of the upper main body 53 of the upper outer panel 7a is brought close to and opposed to the outer flange 19 of the inner panel 5, the first adhesive AD1 is spread, and the upper positioning rib 59 of the upper outer panel 7a is inserted into the insertion space S between the guide walls 21 formed near the upper (outer peripheral) edge of the inner panel 5 and the outer peripheral standing wall 17. As a result, the upper protruding piece 57 of the upper outer panel 7a is pressed against the first protruding strip 29 of the inner panel 5, so that the periphery of the upper peripheral wall 55 of the upper main body 53 is deflected toward the side opposite to the inner panel 5, and the upper protruding piece 57 of the upper outer panel 7a rides over the upper (outer peripheral) edge (first protruding strip 29) of the inner panel 5. At this time, since the upper peripheral wall portion 55 is formed at a position circumferentially separated from the upper positioning rib 59, the periphery of the upper peripheral wall portion 55 of the upper main body portion 53 is easily deflected toward the opposite side to the inner panel 5, compared to the case where the upper peripheral wall portion 55 is formed at the same position in the circumferential direction as the upper positioning rib 59. Also, the guide wall portion 21 of the inner panel 5 abuts against the upper positioning rib 59 of the upper outer panel 7a from the inner peripheral side, thereby restricting the upper protruding piece portion 57 of the upper outer panel 7a from moving toward the inner peripheral side beyond the first protruding strip portion 29 of the inner panel 5. After that, the upper protruding piece portion 57 of the upper outer panel 7a engages with the first protruding strip portion 29 of the inner panel 5 in a state where the upper protruding piece portion 57 overlaps the non-adhesive surface side (lower side in FIG. 11) of the inner panel 5. This restricts the outer flange portion 19 of the inner panel 5 from moving away from the upper main body portion 53 of the upper outer panel 7a in the thickness direction. In this way, the upper protruding piece 57 of the upper outer panel 7a can be easily engaged with the first protruding strip 29 of the inner panel 5 simply by pressing it against the first protruding strip 29 of the inner panel 5. The upper body 53 of the upper outer panel 7a abuts against the tip surface of the second protruding strip 31 of the inner panel 5. Furthermore, the upper positioning rib 59 of the upper outer panel 7a faces the outer peripheral side standing wall 17 of the inner panel 5 from the inner peripheral side (inside the panel, left side in FIG. 10). This restricts the upper protruding piece 57 of the upper outer panel 7a from moving toward the outer peripheral side (outside the panel) relative to the upper (outer peripheral) edge of the inner panel 5 until it no longer overlaps with the first protruding strip 29 (edge ​​portion on the outer peripheral side) of the inner panel 5.

[0053] At the same time, the upper flange portion 63 of the upper outer panel 7a is brought close to the opening upper end flange portion 33 of the inner panel 5 so as to face it, the first adhesive AD1 is pushed and spread, and the positioning protruding wall portion 41 and the connecting rib 43 of the inner panel 5 are inserted into the positioned hole 63c of the upper outer panel 7a. As a result, as shown in Figures 13 and 14, the flexible portion 63b of the upper outer panel 7a is pressed against the opening side protruding piece portion 39 of the inner panel 5 and overcomes the opening side protruding piece portion 39 while bending toward the slit 63a side (the outer periphery side of the opening 15), and the first adhesive AD1 applied to the opening upper end flange portion 33 of the inner panel 5 is pushed and spread and enters the slit 63a and the positioned hole 63c. As a result, the opening side protruding piece portion 39 of the inner panel 5 engages with the flexible portion 63b of the upper outer panel 7a in a state where it overlaps with the non-adhesive surface side. In this state, the upper flange portion 63 of the upper outer panel 7a is restricted from moving away in the thickness direction from the opening upper end flange portion 33 of the inner panel 5. In addition, the first adhesive AD1 enters the slit 63a and restricts the flexible portion 63b from bending toward the slit 63a side, so that the flexible portion 63b is prevented from climbing over the opening side protruding piece portion 39 and moving away from the opening upper end flange portion 33 of the inner panel 5. Furthermore, the positioning protruding wall portion 41 of the inner panel 5 faces the positioned portion 63f of the upper outer panel 7a from the outer periphery side of the opening 15 (inside the panel). This restricts the opening side protruding piece portion 39 of the inner panel 5 from moving toward the inside of the opening 15 (outside the panel) relative to the opening 15 side edge portion of the upper outer panel 7a until it no longer overlaps with the flexible portion (opening 15 side edge portion) 63b of the upper outer panel 7a.

[0054] In this state, the upper positioning rib 59 of the upper outer panel 7a faces the outer peripheral side standing wall portion 17 of the inner panel 17 from the inner peripheral side, and the positioning protruding wall portion 41 of the inner panel 5 faces the positioned portion 63f of the upper outer panel 7a from the outer peripheral side of the opening 15 (inside of the panel). Therefore, when a dimensional error occurs in which the vertical and vehicle width dimensions of the upper outer panel 7a become larger than the dimensions of the mounting area of ​​the upper outer panel 7a in the inner panel 5 due to variations in molding shrinkage rate, the area of ​​the upper outer panel 7a that is inside the panel more than the upper positioning rib 59 and positioning protruding wall portion 41 can be deflected, thereby reducing the influence of the above-mentioned dimensional error that occurs in the positional relationship between the upper protruding piece portion 57 of the upper outer panel 7a and the upper edge portion of the inner panel 5, and the positional relationship between the opening side protruding piece portion 39 of the inner panel 5 and the opening 15 side edge portion of the upper outer panel 7a. Therefore, the upper protruding piece 57 of the upper outer panel 7a can be securely engaged with the upper edge portion of the inner panel 5, and the opening side protruding piece 39 of the inner panel 5 can be securely engaged with the edge portion on the opening 15 side of the upper outer panel 7a, thereby more reliably preventing poor adhesion between the upper outer panel 7a and the inner panel 5 due to separation in the thickness direction in the intervening area of ​​the first adhesive AD1.

[0055] In addition, since the distance D1 between the upper edge of the upper main body portion 53 and the upper positioning rib 59 is set to 30 mm or less, the dimensional variation of the distance D1 between the upper edge of the upper main body portion 53 and the upper positioning rib 59 can be reduced compared to when the distance is set to more than 30 mm. Therefore, the upper protruding piece 57 of the upper outer panel 7a and the edge portion on the outer circumferential side of the inner panel 5 can be engaged more reliably.

[0056] In addition, the lower side flange portion 69 of the lower outer panel 7b is brought close to the opening lower end side flange portion 35 of the inner panel 5 while facing it, the first adhesive AD1 is spread, and the insertion piece portion 71 of the lower outer panel 7b is inserted into the first and second through holes 47a, 49a of the inner panel 5, and the claw portion 73 of the lower outer panel 7b is engaged with the peripheral portion of the first through hole 47a.

[0057] At the same time, the outer peripheral edge of the lower side main body portion 65 of the lower outer panel 7b is brought close to the outer flange portion 19 of the inner panel 5 while facing the outer flange portion 19, the first adhesive AD1 is spread, and the lower positioning rib 79 of the lower outer panel 7b is inserted into the insertion space S between the outer peripheral standing wall portion 17 and each guide wall portion 21 formed near the edge of the lower side and both sides (outer peripheral sides) in the vehicle width direction of the inner panel 5. As a result, the lower protruding piece portion 77 of the lower outer panel 7b is pressed against the first protruding portion 29 of the inner panel 5, so that the periphery of the lower peripheral wall portion 77 of the lower side main body portion 65 is deflected toward the side opposite to the inner panel 5, and the lower protruding piece portion 77 of the lower outer panel 7b rides over the outer peripheral edge portion (first protruding portion 29) of the inner panel 5. At this time, since the lower protruding piece 77 is formed at a position circumferentially separated from the lower positioning rib 79, the lower main body portion 65 is easily deflected around the lower protruding piece 77 toward the side opposite the inner panel 5, compared to when the lower protruding piece 77 is formed at the same position circumferentially as the lower positioning rib 79. Also, the guide wall portion 21 of the inner panel 5 abuts against the lower positioning rib 79 of the lower outer panel 7b from the inner peripheral side, thereby restricting the lower protruding piece 77 of the lower outer panel 7b from moving toward the inner peripheral side beyond the first protruding strip portion 29 of the inner panel 5. Thereafter, the lower protruding piece 77 of the lower outer panel 7b engages with the first protruding strip portion 29 of the inner panel 5 in a state where the first protruding strip portion 29 is overlapped from the non-adhesive surface side (lower side in FIG. 5) of the inner panel 5. This restricts the outer flange portion 19 of the inner panel 5 from moving away from the lower main body portion 65 of the lower outer panel 7b in the thickness direction. In this manner, the lower protruding piece 77 of the lower outer panel 7b can be easily engaged with the first protruding strip 29 of the inner panel 5 simply by pressing it against the first protruding strip 29 of the inner panel 5. The lower main body 65 of the lower outer panel 7b abuts against the tip end surface of the second protruding strip 31 of the inner panel 5. The lower positioning rib 79 of the lower outer panel 7b faces the outer peripheral side standing wall portion 17 of the inner panel 5 from the inner peripheral side (the inner side of the panel, the right side in FIG. 6). This restricts the lower protruding piece 77 of the lower outer panel 7b from moving toward the outer peripheral side (outer side of the panel) relative to the outer peripheral edge of the inner panel 5 until it no longer overlaps with the first protruding strip 29 (the outer peripheral edge) of the inner panel 5.

[0058] In this state, the lower positioning rib 79 of the lower outer panel 7b faces the outer peripheral standing wall portion 17 of the inner panel 5 from the inner peripheral side, so that when a dimensional error occurs in which the vertical and vehicle widthwise dimensions of the lower outer panel 7b become larger than the dimensions of the mounting region of the lower outer panel 7b in the inner panel 5 due to variations in molding shrinkage rate or the like, the influence of the dimensional error occurring in the positional relationship between the lower protruding piece 77 of the lower outer panel 7b and the outer peripheral edge portion of the inner panel 5 can be reduced by bending the region of the lower outer panel 7b that is inner than the lower positioning rib 79. Therefore, the lower protruding piece 77 of the lower outer panel 7b can be reliably engaged with the outer peripheral edge portion of the inner panel 5, and poor adhesion caused by the lower outer panel 7b and the inner panel 5 being separated in the thickness direction in the intervening region of the first adhesive AD1 can be more reliably prevented.

[0059] In addition, since the distance D2 between the outer peripheral edge of the lower main body portion 65 and the lower positioning rib 79 is set to 20 to 30 mm, the dimensional variation of the distance D2 between the outer peripheral edge of the lower main body portion 65 and the lower positioning rib 79 can be reduced compared to when the distance is set to more than 30 mm. Therefore, the lower protruding piece portion 77 of the lower outer panel 7b and the outer peripheral edge of the inner panel 5 can be engaged more reliably.

[0060] In this manner, by simply bringing the upper outer panel 7a close to the inner panel 5, engaging the upper protruding piece 57 of the upper outer panel 7a with the upper edge portion of the inner panel 5, and engaging the opening side protruding piece 39 of the inner panel 5 with the flexible portion 63b (the edge portion on the opening 15 side) of the upper outer panel 7a, it is possible to prevent the inner panel 5 and the upper outer panel 7a from separating in the thickness direction without performing laser welding. Similarly, by simply bringing the lower outer panel 7b close to the inner panel 5, engaging the claw portion 73 of the lower outer panel 7b with the first through hole 47a of the inner panel 5, and engaging the lower protruding piece 77 of the lower outer panel 7b with the edge portion on the outer circumferential side of the inner panel 5, it is possible to prevent the inner panel 5 and the lower outer panel 7b from separating in the thickness direction without performing laser welding. This facilitates the operation of preventing the panels 5, 7 from moving apart in the thickness direction before the first adhesive AD1 hardens. Also, since there is no need to use laser processing equipment, the equipment costs can be reduced.

[0061] In addition, an upper peripheral wall portion 55 and a lower peripheral wall portion 75 are provided on the outer peripheral edge of the outer panel 7, and an opening side peripheral wall portion 37 is provided on the opening 15 side edge of the inner panel 5, so that these upper peripheral wall portion 55, lower peripheral wall portion 75 and opening side peripheral wall portion 37 can prevent the first adhesive AD1 from spilling out to the outside of the panel during the process of spreading the first adhesive AD1 between the two panels 5, 7.

[0062] Furthermore, since the first adhesive AD1 enters the inside of the slit 63a and restricts the flexible portion 63b from bending toward the slit 63a, the engagement between the opening-side protruding piece 39 and the flexible portion 63b can be reliably maintained. This makes it possible to more reliably prevent poor adhesion caused by the inner panel 5 and the upper outer panel 7a being separated in the thickness direction in the region where the first adhesive AD1 is present.

[0063] Thereafter, a second adhesive AD2 is applied to the upper flange portion 63 of the upper outer panel 7a, the lower flange portion 69 of the lower outer panel 7b, and the portions of the outer flange portions 19 on both sides of the opening 15 of the inner panel 5 in the vehicle width direction that are not covered by the outer panel 7, and the outer periphery of the window panel 9 is overlapped and fixed with a temporary fastening means not shown.

[0064] Thereafter, the first and second adhesives AD1, AD2 are completely cured with the inner panel 5, outer panel 7 and window panel 9 overlapped, thereby bonding the inner panel 5, outer panel 7 and window panel 9 to one another.

[0065] A drying oven is not necessarily required to cure the first and second adhesives AD1, AD2, and the first and second adhesives AD1, AD2 can be cured at room temperature. Even if the first and second adhesives AD1, AD2 are not completely cured, the inner panel 5, outer panel 7, and window panel 9 do not easily separate in the thickness direction in the regions where the first and second adhesives AD1, AD2 are present, so that after the inner panel 5, outer panel 7, and window panel 9 are overlapped with the first and second adhesives AD1, AD2 interposed therebetween, it becomes possible to immediately carry out the next process, such as assembling other parts or transporting.

[0066] Second Embodiment FIG. 20 is a view corresponding to FIG. 6 of the second embodiment of the present invention. In the second embodiment, the first protrusion 29 and the second protrusion 31 are not formed in the lower half of the inner panel 5. As shown in FIG. 22 and FIG. 24, a protrusion 81 having a trapezoidal cross section and extending in the circumferential direction is formed on the outer peripheral edge of the outer flange portion 19 of the lower half of the inner panel 5 so as to protrude toward the outer panel 7 side and the outer peripheral side. The protrusion 81 is disposed at a position spaced apart from the guide wall portion 21 in the circumferential direction. As shown in FIG. 20 to FIG. 23, the lower peripheral wall portion 75 of the lower outer panel 7b is formed continuously over the entire outer peripheral edge. In addition, a plurality of recesses 75a recessed toward the outer peripheral side over the entire protruding direction are formed on the inner peripheral surface of the lower peripheral wall portion 75 at intervals from each other in the circumferential direction. Therefore, the recesses 75a-forming region of the lower peripheral wall portion 75 is thinner than the recesses 75a-not-forming region. The lower protruding piece 77 is claw-shaped and protrudes from the tip of the circumferential center of the recess 75a of the lower peripheral wall 75 toward the inner peripheral side (the inner side of the panel).

[0067] The lower protruding piece 77 of the lower outer panel 7b engages with the protrusion 81 of the inner panel 5 in an overlapping state from the non-adhesive surface side of the inner panel 5 (lower side in Figure 22), thereby preventing the outer flange portion 19 of the inner panel 5 from moving away from the lower main body portion 65 of the lower outer panel 7b in the thickness direction.

[0068] The other configurations are the same as those in the first embodiment, so the same components are given the same reference numerals and the description thereof is omitted.

[0069] Therefore, according to this embodiment 2, the lower protruding piece 77 is formed in the recess 75a forming area, which is thinner than the recess 75a non-forming area, so that the lower protruding piece 77 is easily deflected outward in the process of engaging the lower protruding piece 77 with the protrusion 81 of the inner panel 5.

[0070] Furthermore, since the protrusion 81 is disposed at a position spaced apart from the guide wall portion 21 in the circumferential direction, the area around the protrusion 81 can be easily deflected inwardly in the process of engaging the lower protruding piece 77 with the protrusion 81 of the inner panel 5 .

[0071] In the above first and second embodiments, the upper peripheral wall portion 55, the upper protruding piece portion 57, the lower peripheral wall portion 75, and the lower protruding piece portion 77 are provided on the outer panel 7, but they may be provided on the inner panel 5. In that case, the guide wall portion 21 may be used as the positioned portion, and the upper positioning rib 59 and the lower positioning rib 79 may face the guide wall portion 21 from the outer periphery side (outside the panel), thereby restricting the upper protruding piece portion 57 and the lower protruding piece portion 77 from moving toward the outer periphery side (outside the panel) relative to the end portion on the outer periphery side of the outer panel 7.

[0072] Further, in the above first and second embodiments, the outer panel 7 is configured by the upper outer panel 7a and the lower outer panel 7b, but it may be configured by a single resin panel. [Industrial Applicability]

[0073] INDUSTRIAL APPLICABILITY The present invention is useful as a vehicle back door comprising an inner panel and an outer panel having an opening for a window, the outer peripheral sides of both panels and the edge portions on the opening side being bonded together with an adhesive. [Explanation of symbols]

[0074] 1. Backdoor 5 Inner Panel 7 Outer Panel 15 Aperture 17 Outer peripheral wall portion (positioned portion) 37 Opening side peripheral wall part 39 Opening side protruding piece 41 Positioning protruding wall portion (positioning protrusion) 55 Upper peripheral wall part 57 Upper protruding piece 59 Upper positioning rib (positioning protrusion) 63a Slit 63b Flexible part 63f Positioned part 75 Lower peripheral wall part 77 Lower protruding piece 79 Lower positioning rib (positioning protrusion) AD1 First Adhesive

Claims

1. A vehicle back door comprising an inner panel (5) and an outer panel (7) having a window opening (15), the outer peripheral sides of both panels (5, 7) and the edge portions of the opening (15) being bonded together with an adhesive (AD1), A peripheral wall portion (37, 55, 75) is provided at an end edge of one of the inner panel (5) and the outer panel (7) to protrude toward the other panel, and a protruding piece portion (39, 57, 77) is formed at a tip end of the peripheral wall portion (37, 55, 75) so as to protrude toward the inside of the panel, A plurality of positioning projections (41, 59, 79) are provided at positions slightly away from an edge of one of the inner panel (5) and the outer panel (7) and protrude toward the other panel at intervals along the edge, The mating panel is provided with a positioned portion (17, 63f), the protruding piece (39, 57, 77) of the one panel engages with an edge portion of the other panel in an overlapping state from the non-adhesive surface side of the other panel, thereby restricting the other panel from separating from the one panel in a thickness direction; the plurality of positioning protrusions (41, 59, 79) of the panel on one side face the positioned portion (17, 63f) of the opposing panel from the inside or outside of the panel, thereby restricting the movement of the protruding piece portion (39, 57, 77) of the one panel toward the outer periphery of the panel relative to the edge portion of the other panel until the protruding piece portion does not overlap with the edge portion of the other panel; The adhesive (AD1) extends along an edge of the one panel on an inner side of the panel relative to the peripheral wall portion (37, 55, 75).

2. The vehicle back door according to claim 1, The peripheral wall portion (55, 75) is provided on an outer peripheral edge of the outer panel (7), A standing wall portion (17) is formed at a location slightly away from the outer peripheral edge of the inner panel (5), the standing wall portion (17) protruding in a direction away from the outer peripheral edge of the inner panel (5), The positioning projections (59, 79) are provided at positions slightly spaced from the outer peripheral edge of the outer panel (7), the positioned portion (17, 63f) is the standing wall portion (17), The adhesive (AD1) extends on an outer circumferential side beyond the positioning protrusions (59, 79).

3. The vehicle back door according to claim 1 or 2, The peripheral wall portion (37) is provided on an edge of the inner panel (5) on the opening (15) side, a slit (63a) extending along the edge of the outer panel (7) is formed at a location slightly away from the edge on the opening (15) side, and a portion of the outer panel (7) adjacent to the slit (63a) from the edge side constitutes a flexible portion (63b) which is flexible toward the slit (63a) when the adhesive (AD1) is not present inside the slit (63a); the protruding piece portion (39) engages with the flexible portion (63b) in an overlapping state from the non-adhesive surface side of the outer panel (7), thereby preventing the outer panel (7) from moving away from the inner panel (5) in a thickness direction; The adhesive (AD1) penetrates into the inside of the slit (63a) to restrict the flexible portion (63b) from bending toward the slit (63a).

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