JP7611006B2 - Vehicle back door - Google Patents

Description

The present invention relates to a vehicle back door that has an inner panel and an outer panel with a window opening, and the outer periphery of both panels and the edge of the opening are bonded together with an adhesive.

A known method for manufacturing a vehicle back door includes a resin inner panel and a resin outer panel with a window opening, with the outer periphery and opening edge portions of both panels bonded together with an adhesive. The method involves applying adhesive to the outer periphery and opening edge portions of the inner panel, overlapping and adhering the two panels together, and then holding the two panels with a jig or the like to prevent them from moving relative to each other until the adhesive hardens. With this method, the two panels are held with a jig or the like between overlapping and adhering the two panels together and the adhesive hardening, which creates the problem that subsequent processes such as assembly of other parts and transportation cannot be carried out.

Patent Document 1 discloses a method for manufacturing a vehicle back door that includes an inner panel and an outer panel with a window opening, with the outer periphery and the edge of the opening of both panels bonded together with an adhesive. In this manufacturing method, adhesive is applied to the outer periphery and the edge of the opening of the inner panel, and then the two panels are overlapped and tightly attached to each other and laser welded, preventing the two panels from moving apart in the thickness direction before the adhesive hardens, making it possible to carry out the next process before the adhesive hardens.

JP 2017-185833 A

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. In addition, the need to use laser processing equipment leads to increased equipment costs.

The present invention was made in consideration of these points, and its purpose is to shorten the manufacturing takt time of vehicle tailgates by making it possible to carry out the next process 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.

In order to achieve the above-mentioned object, the present invention is characterized in that a protruding piece is provided at the edge portion of one panel and engaged with the edge portion of the other panel to prevent the two panels from moving apart in the thickness direction, and a positioning protrusion is provided on one panel and opposed to a part of the mating panel from the inside or outside of the panel, thereby preventing the protruding piece of one panel from moving toward the outer periphery of the panel relative to the edge portion of the other panel.

Specifically, the first invention is based on a vehicle back door that includes an inner panel and an outer panel with a window opening, with the outer periphery of both panels and the edge of the opening bonded together with an adhesive, and provides the following solution.

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 panels, 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 one another 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 is fitted to the edge portion of the other panel. the adhesive engages with the non-adhesive surface of the panel in an overlapping state, thereby preventing the other panel from moving away from the one panel in the thickness direction, and the multiple positioning protrusions of the one panel face the positioned portion of the mating panel from the inside or outside of the panel, thereby preventing the protruding piece portion of the one panel from moving toward the outer periphery of the panel relative to the edge portion of the other panel until it no longer overlaps with the edge portion of the other panel, and the adhesive extends along the edge of the one panel on the inside of the panel relative to the peripheral wall portion.

The second invention is characterized in that in the vehicle back door according to the first invention, the peripheral wall portion is provided on the outer peripheral edge of the outer panel, 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 on the outer peripheral side of the multiple positioning protrusions.

The third invention is characterized in that, in the vehicle back door according to the first or second invention, the peripheral wall portion is provided on the edge of the opening side of the inner panel, a slit is formed at a location slightly away from the edge of the opening side of the outer panel, extending along the edge, 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 side 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 the inside of the slit to restrict the flexible portion from bending toward the slit side.

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. This makes it easier to prevent the two panels from moving apart in the thickness direction before the adhesive hardens. 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 for the vehicle back door can be shortened.

In addition, by having the positioning protrusion of one panel face the positioned portion, the protruding piece of one panel is restricted from moving outward relative to the edge of the other panel. Therefore, 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 rates, the one panel is deflected on the inside of the panel beyond the positioning protrusion, thereby reducing the effect of the dimensional error that occurs in the positional relationship between the protruding piece of the one panel and the edge of the other panel. 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 of the other panel, and poor adhesion caused by the two panels being separated in the thickness direction in the adhesive intervening area can be more reliably prevented.

In addition, a peripheral wall is provided at the edge of one of the panels, which prevents the adhesive from spilling out onto the outside of the panels when the two panels are brought closer together and the adhesive is spread out.

According to the second invention, the protruding piece of the outer panel can be easily engaged with the edge portion on the outer periphery of the inner panel by pressing the protruding piece of the outer panel against the edge portion on the outer periphery of the inner panel and deflecting the area of the outer panel on the outer periphery side of the positioning protrusion toward the opposite side of the inner panel.

According to the third invention, the adhesive penetrates into the slit and prevents 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. Therefore, poor adhesion caused by the two panels separating in the thickness direction in the adhesive intervening area can be more reliably prevented.

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

The following describes in detail an embodiment of the present invention with reference to the drawings. In the following embodiment, for ease of explanation, the front side in the longitudinal direction of the vehicle is referred to as "front" and the rear side as "rear", the left side in the width direction of the vehicle facing the front of the vehicle is referred to as "left" and the right side as "right", the upper side in the vehicle height direction is referred to as "upper" and the lower side is referred to as "lower". In addition, unless otherwise specified as to whether the back door according to this embodiment is open or closed, the description will be given assuming that the back door opening at the rear of the vehicle is in a closed position.

First Embodiment
1 shows a vehicle back door 1 according to a first embodiment of the present invention. The back door 1 is a top-bottom opening/closing type back door that opens and closes a door opening provided at the rear end of a hatchback vehicle body.

The back door 1 includes 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 FIG. 1).

The inner panel 5 is a single panel formed 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.

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 part 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 part of the panel body 13 below the opening 15 (hereinafter referred to as the "lower half") faces its plate surface in the longitudinal direction. The part of the panel body 13 above the opening 15 of the inner panel 5 is inclined forward and upward. Hereinafter, the outer periphery of both panels 5 and 7 and the inner periphery of the opening 15 are referred to as the "outer panel side", and the inner periphery of both panels 5 and 7 and the outer periphery of the opening 15 are referred to as the "inner panel side".

A bulge 13a is formed near the lower edge of the opening 15 in the center of the vehicle width direction of the panel body 13 of the inner panel 5, and is generally rectangular in plan view and elongated in the vehicle width direction, bulging toward the outer panel 7 (rear side). A first opening 13b for mounting a lamp for illuminating the license plate, which is housed on the interior side of the bulge 13a, and a second opening 13c for mounting a switch for releasing the opening/closing lock of the vehicle back door 1 are formed on the end surface of the bulge 13a on the outer panel 7 side.

As shown in Figs. 4 to 11, the outer peripheral edge of the panel body 13 of the inner panel 5 has an outer peripheral side standing wall 17 as a positioned part rising toward the outer panel 7. At the rear end of the outer peripheral side standing wall 17, a plate-shaped outer flange 19 for joining is formed so as to protrude toward the outer peripheral side, and this outer flange 19 constitutes the outer peripheral edge of the inner panel 5. Therefore, the outer peripheral side standing wall 17 protrudes in a direction away from the outer panel 7 from the outer peripheral edge of the inner panel 5 at a location slightly away from the inner peripheral side from the outer peripheral 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 17 toward the opposite outer panel 7 side, a guide wall 21 bent in a substantially L-shaped cross section is protruded so as to form an insertion space S that opens toward the outer panel 7 side between the outer peripheral side standing wall 17 and the outer peripheral side standing wall 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 inward toward the tip side so as to move away from the outer peripheral side standing wall portion 17 toward the outer panel 7 side. 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 Figures 7 and 8. As shown in Figure 9, 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, and multiple insertion holes 17b for inserting wiring such as stop lamps are formed in the middle of 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.

The edge of the panel body 13 of the inner panel 5 on the opening 15 side is provided with an opening side standing wall 25 that rises toward the outer panel 7 around the entire circumference except for the area where the bulge 13a is formed. Therefore, the panel body 13 of the inner panel 5, the outer peripheral side standing wall 17, and the opening side standing wall 25 form a recess 27 that is recessed toward the side opposite the outer panel 7.

A number of first ridges 29 are formed at intervals in the circumferential direction on the outer peripheral edge of the outer flange portion 19 of the inner panel 5, which extend on both sides in the vehicle width direction of the upper and lower ends and on the lower side. The first ridges 29 are arranged at positions spaced apart in the circumferential direction from the guide wall portion 21. Second ridges 31 are formed in the parts of the outer peripheral edge of the outer flange portion 19 of the inner panel 5 where the first ridges 29 are not formed, and which protrude almost perpendicularly toward the outer panel 7.

At the rear end of the portion of the opening side upright wall 25 that extends in the vehicle width direction above the opening 15, a plate-shaped opening upper end flange 33 with a plate surface facing diagonally upward toward the rear is provided so as to protrude inwardly into the opening 15. At the portion of the opening side upright wall 25 that extends in the vehicle width direction below the opening 15 and at the upper end of the bulging portion 13a, a opening lower end flange 35 with a plate surface facing diagonally upward toward the rear is provided continuously so as to protrude inwardly into the opening 15.

As shown in Figures 12 to 14, the opening-side peripheral wall 37 is provided on the opening 15 side edge (lower edge) of the opening upper end flange 33, 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 are formed at intervals in the circumferential direction (vehicle width direction) of the opening 15, protruding toward the inside of the panel (the outer periphery of the opening 15), i.e., diagonally upward toward the front. In addition, at a location slightly above the opening 15 side edge of the opening upper end flange 33, as shown in Figures 15 and 16, a plurality of positioning protrusions as 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 the direction along the upper edge of the opening 15 (vehicle width direction). The center of each positioning protruding wall 41 in the vehicle width direction is connected to the opening side peripheral wall 37 by a plate-shaped connecting rib 43 whose plate surface faces in the vehicle width direction.

As shown in Figs. 18 and 19, a plurality of first extending wall portions 45 extending forward are formed at intervals in the direction along the lower edge of the opening 15 (vehicle width direction) on 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 that is 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 that is long in the vehicle width direction is formed through the protruding wall portion 47. A second extending wall portion 49 is extended 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 on the edge (upper edge) on the opening 15 side of the opening lower end flange portion 35. A plurality of second rectangular through holes 49a that are long in the vehicle width direction are formed through the second extending wall portion 49.

As shown in Figs. 1 and 2, on the panel body 13 above the opening 15 of the inner panel 5, a plurality of upper reinforcing ribs 51a in the form of a plate with their plate surfaces facing in the vehicle width direction are provided protruding toward the outer panel 7, and each of the upper reinforcing ribs 51a is connected to the outer peripheral side standing wall portion 17 and the opening side standing wall portion 25. On the lower end of the panel body 13, a plurality of lower reinforcing ribs 51b in the form of a plate with their plate surfaces facing in the vehicle width direction are provided protruding toward the outer panel 7, and each of the lower reinforcing ribs 51b is connected to the outer peripheral side standing wall portion 17.

The outer panel 7 is divided into two parts, an upper outer panel 7a located on the top side and a lower outer panel 7b located on the bottom 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).

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

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 upper (outer) edge of the upper body 53, protruding toward the inner panel 5 side (lower side) at intervals in the circumferential direction (vehicle width direction). At the tip of the upper peripheral wall portion 55, an upper protruding piece portion 57 is formed that protrudes diagonally downward toward the inside of the panel (the inner periphery side of the upper outer panel 7a (left side in FIG. 11)). As shown in FIG. 10, at a location slightly away from the upper (outer) edge of the upper outer panel 7a toward 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 toward the inner panel 5 side (lower side) in the direction along the edge (vehicle width direction). The distance D1 between the upper edge of the upper body 53 and the upper positioning rib 59 is set to 20 to 30 mm. The upper positioning rib 59 is positioned at a different position in the circumferential direction (vehicle width direction) than the upper peripheral wall 55 and the upper protruding piece 57.

As shown in Figs. 12 to 14 and 16, a lower side wall portion 61 is formed on the lower edge of the upper body portion 53 of the upper outer panel 7a, protruding toward the inner panel 5 side (diagonally forward toward the lower side), and a plate-shaped upper flange portion 63 located closer to the inner panel 5 side than the upper body portion 53 is formed at the lower end of the lower side wall portion 61 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 portion 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 the direction along the edge. The portion of the upper flange portion 63 adjacent to the slit 63a from the edge side constitutes a flexible portion 63b that can bend toward the slit 63a side when there is no first adhesive AD1 described later inside the slit 63a. In addition, a positioning hole 63c that is approximately T-shaped in plan view is formed at the lower end of the upper flange portion 63. This positioning hole 63c is composed of a plurality of rectangular first long hole portions 63d that extend 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 that extends vertically from the center of the first long hole portion 63d in the vehicle width direction to the edge. The portions of the second long hole portion 63e in the upper flange portion 63 that face the first long hole portion 63d from the opening 15 side on both sides of the vehicle width direction constitute the positioning portion 63f.

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

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

The lower outer panel 7b has a lower-side main body 65 which constitutes the main body. As shown in Figs. 17 to 19, an inclined surface 67 which inclines upward and forward is provided on the upper edge of the lower-side main body 65 over the entire width of the vehicle, and a plate-shaped lower-side flange 69 which is located closer to the inner panel 5 (front side) than the lower-side main body 65 is formed on the upper side of the inclined surface 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 69, a plurality of plate-shaped insertion pieces 71 with their plate surfaces facing approximately vertically are provided at intervals in the vehicle width direction toward the inner panel 5 (front side). A claw portion 73 which protrudes upward is formed on the tip of some of the insertion pieces 71.

A lamp unit mounting recess 65a is formed at the upper end of both ends of the lower body 65 in the vehicle width direction, recessed forward from the area below the lamp unit mounting recess 65a. A license plate mounting recess 65b is formed above the vertical center of the vehicle width center of the lower body 65, recessed forward from the area below the license plate mounting recess 65b.

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

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) or glass.

The upper outer panel 7a configured as described above is attached to the inner panel 5 from an upwardly rearward angle 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, and the opening upper end side flange portion 33 of the inner panel 5, i.e., the edge portion on the opening 15 side, are bonded to the first adhesive AD1.

The first adhesive AD1 may be a urethane adhesive, an epoxy adhesive, or the like. 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.

In FIG. 2, the application area of the first adhesive AD1 on the inner panel 5 is shown 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 (inside 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 (inside of the panel).

In this state, as shown in Fig. 11, the upper protruding piece 57 of the upper outer panel 7a engages with the first protrusion 29 (edge portion on the outer periphery) 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 body portion 53 of the upper outer panel 7a. On the other hand, as shown in Fig. 10, the upper edge portion of the upper body portion 53 of the upper outer panel 7a and the tip surface of the second protrusion portion 31 of the inner panel 5 face each other with a gap in the thickness direction. In addition, the upper positioning rib 59 of the upper outer panel 7a is inserted into the 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 (inside of the panel, left side in FIG. 10), thereby restricting the upper protruding piece portion 57 of the upper outer panel 7a from moving toward the outer peripheral side (outside of the panel) relative 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.

12 and 14, the opening side protruding piece 39 of the inner panel 5 overlaps and engages with the flexible portion 63b of the upper outer panel 7a 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 top end side flange portion 33 of the inner panel 5. Furthermore, the first adhesive AD1, when it penetrates inside 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 (inside the panel, diagonally upper right side in FIG. 16), thereby restricting 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 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.

On the other hand, the lower outer panel 7b is assembled to the inner panel 5 from the rear with the lower side main body portion 65 facing the inner panel 5 below the opening 15. The lower side flange portion 69 of the lower outer panel 7b, i.e., the edge portion on the opening 15 side, and the opening lower end side flange portion 35 of the inner panel 5, i.e., the edge portion on the opening 15 side, are bonded via adhesive AD1, and the lower side and both sides in the vehicle width direction, i.e., the edge portion on the outer periphery side, of the lower outer panel 7b and the outer flange portion 19 of the inner panel 5, i.e., the 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 (inside the panel) of the lower peripheral wall portion 75 and on the outer periphery side of the lower positioning rib 79. Additionally, the upper portion of the license plate mounting recess 65b of the lower outer panel 7b is bonded to the outer periphery of the end face of the bulging portion 13a of the inner panel 5 via a first adhesive AD1.

In this state, as shown in Figures 17 to 19, 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 periphery of the first through hole 47a, thereby preventing the insertion piece portion 71 from coming out of the first through hole 47a.

5, the lower protruding piece 77 of the lower outer panel 7b engages with the first protrusion 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 from the lower body 65 of the lower outer panel 7b in the thickness direction. Meanwhile, as shown in FIG. 6, the outer peripheral edge of the lower body 65 of the lower outer panel 7b and the tip surface of the second protrusion 31 of the inner panel 5 face each other with a gap in the thickness direction. Also, as shown in FIG. 6 to FIG. 8, the lower positioning ribs 79 of the lower outer panel 7b are inserted into the insertion space S between the guide wall 21 and the outer peripheral standing wall 17 formed near the upper and both edges 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 FIG. 6), thereby restricting the movement of the lower protruding piece 77 of the lower outer panel 7b 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.

In addition, the outer periphery of the window panel 9 is adhered 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 portion 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 via a second adhesive AD2 made of a urethane adhesive or the like. Therefore, the slit 63a and the first long hole portion 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.

The lamp unit 11 is also attached to the lamp unit mounting recess 65a of the lower outer panel 7b.

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

Then, the outer peripheral (upper) edge of the upper body 53 of the upper outer panel 7a is brought close to and opposed to the outer flange 19 of the inner panel 5, spreading the first adhesive AD1, and inserting the upper positioning rib 59 of the upper outer panel 7a 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, causing the periphery of the upper peripheral wall 55 of the upper body 53 to bend toward the opposite side of 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 upper body portion 53 around the upper peripheral wall portion 55 is easily deflected toward the opposite side to the inner panel 5, compared to when 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 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 portion 29 of the inner panel 5 simply by pressing it against the first protruding portion 29 of the inner panel 5. In addition, the upper side main body portion 53 of the upper outer panel 7a abuts against the tip surface of the second protruding portion 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 portion 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 portion 29 (edge portion on the outer peripheral side) of the inner panel 5.

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, 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 positioning 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 into the slit 63a and the positioning 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 from the opening upper end flange portion 33 of the inner panel 5 in the thickness direction. 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 positioning 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.

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 widthwise 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 closer to the panel inside 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 edge portion on the opening 15 side 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 of the inner panel 5, and the opening side protruding piece 39 of the inner panel 5 can be securely engaged with the edge of the opening 15 side of the upper outer panel 7a, which more reliably prevents poor adhesion caused by the upper outer panel 7a and the inner panel 5 being separated in the thickness direction in the intervening area of the first adhesive AD1.

In addition, the distance D1 between the upper edge of the upper body 53 and the upper positioning rib 59 is set to 30 mm or less, so the dimensional variation of the distance D1 between the upper edge of the upper body 53 and the upper positioning rib 59 can be reduced compared to when it is set to a value greater than 30 mm. This allows the upper protruding piece 57 of the upper outer panel 7a to engage with the outer peripheral edge of the inner panel 5 more reliably.

The lower flange portion 69 of the lower outer panel 7b is brought close to the opening lower end 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.

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 of the inner panel 5, spreading the first adhesive AD1, and inserting the lower positioning rib 79 of the lower outer panel 7b into the insertion space S between the guide wall portions 21 formed near the edges of the lower side and both sides (outer peripheral sides) of the inner panel 5 in the vehicle width direction and the outer peripheral side standing wall portion 17. As a result, the lower protruding piece 77 of the lower outer panel 7b is pressed against the first protruding piece 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 the inner panel 5, and the lower protruding piece 77 of the lower outer panel 7b rides over the outer peripheral edge (first protruding piece 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 more easily deflected around the lower protruding piece 77 toward the side opposite the inner panel 5 than 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 inward beyond the first protruding strip 29 of the inner panel 5. Thereafter, the lower protruding piece 77 of the lower outer panel 7b engages with the first protruding strip 29 of the inner panel 5 in a state where the first protruding strip 29 overlaps 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 way, the lower protruding piece 77 of the lower outer panel 7b can be easily engaged with the first protruding portion 29 of the inner panel 5 simply by pressing it against the first protruding portion 29 of the inner panel 5. In addition, the lower side main body portion 65 of the lower outer panel 7b abuts against the tip surface of the second protruding portion 31 of the inner panel 5. In addition, 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 the panel, 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 (outside the panel) relative to the outer peripheral edge of the inner panel 5 until it no longer overlaps with the first protruding portion 29 (outer peripheral edge) of the inner panel 5.

In this state, 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. Therefore, when a dimensional error occurs in which the vertical and widthwise dimensions of the lower outer panel 7b are larger than the dimensions of the mounting area of the lower outer panel 7b in the inner panel 5 due to variations in molding shrinkage rate, the influence of the above-mentioned dimensional error occurring in the positional relationship between the lower protruding piece 77 of the lower outer panel 7b and the outer peripheral edge of the inner panel 5 can be reduced by bending the area 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 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 area of the first adhesive AD1 can be more reliably prevented.

In addition, the distance D2 between the outer peripheral edge of the lower main body 65 and the lower positioning rib 79 is set to 20 to 30 mm, so the dimensional variation of the distance D2 between the outer peripheral edge of the lower main body 65 and the lower positioning rib 79 can be reduced compared to when it is set to a value greater than 30 mm. This allows the lower protruding piece 77 of the lower outer panel 7b to engage with the outer peripheral edge of the inner panel 5 more reliably.

In this way, 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 of the inner panel 5, and engaging the opening side protruding piece 39 of the inner panel 5 with the flexible part 63b (edge on the opening 15 side) of the upper outer panel 7a, the inner panel 5 and the upper outer panel 7a can be prevented from moving apart in the thickness direction without 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 on the outer periphery of the inner panel 5, the inner panel 5 and the lower outer panel 7b can be prevented from moving apart in the thickness direction without laser welding. This makes it easier to prevent the panels 5 and 7 from moving apart in the thickness direction before the first adhesive AD1 hardens. In addition, there is no need to use laser processing equipment, which reduces equipment costs.

In addition, the upper peripheral wall portion 55 and the lower peripheral wall portion 75 are provided on the outer peripheral edge of the outer panel 7, and the opening side peripheral wall portion 37 is provided on the opening 15 side edge of the inner panel 5. This allows the upper peripheral wall portion 55, the lower peripheral wall portion 75 and the opening side peripheral wall portion 37 to prevent the first adhesive AD1 from spilling out to the outside of the panels during the process of spreading the first adhesive AD1 between the two panels 5, 7.

In addition, the first adhesive AD1 penetrates into the slit 63a and prevents the flexible portion 63b from bending toward the slit 63a, so that 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 becoming separated in the thickness direction in the region where the first adhesive AD1 is present.

Then, the 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).

Then, the first and second adhesives AD1, AD2 are completely cured while the inner panel 5, outer panel 7, and window panel 9 are stacked together, thereby bonding the inner panel 5, outer panel 7, and window panel 9 to each other.

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 intervening areas of the first and second adhesives AD1, AD2. Therefore, after the inner panel 5, outer panel 7, and window panel 9 are stacked with the first and second adhesives AD1, AD2 intervening, the next process, such as assembling other parts or transporting, can be performed immediately.

Second Embodiment
FIG. 20 is a view equivalent 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 recess 75a-forming region of the lower peripheral wall portion 75 is thinner than the recess 75a-non-forming region. The lower protruding piece 77 is shaped like a claw and protrudes from the tip of the circumferential center of the recess 75a of the lower peripheral wall 75 toward the inner periphery (inner side of the panel).

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 side of the inner panel 5 (the lower side in FIG. 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.

The rest of the configuration is the same as in embodiment 1, so the same components are given the same reference numerals and their explanations are omitted.

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.

In addition, since the protrusion 81 is positioned at a distance from the guide wall portion 21 in the circumferential direction, the area around the protrusion 81 can be easily deflected inward during the process of engaging the lower protruding piece 77 with the protrusion 81 of the inner panel 5.

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 this case, the guide wall portion 21 is used as the positioned portion, and the upper positioning rib 59 and the lower positioning rib 79 face the guide wall portion 21 from the outer periphery (outside the panel), thereby restricting the upper protruding piece portion 57 and the lower protruding piece portion 77 from moving toward the outer periphery (outside the panel) relative to the outer periphery end of the outer panel 7.

In addition, in the above-mentioned first and second embodiments, the outer panel 7 is composed of an upper outer panel 7a and a lower outer panel 7b, but it may be composed of a single resin panel.

The present invention is useful as a vehicle back door that includes an inner panel and an outer panel with a window opening, with the outer periphery of both panels and the edge of the opening bonded together with an adhesive.

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

Claims (3)

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). 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). 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).

Images