JP2020050312A - Vehicle back door structure - Google Patents

Abstract

To provide a back door structure which can secure surface rigidity of an outer panel of a lift gate in a wide range with a reinforcement plate.SOLUTION: A back door structure 1 of a vehicle includes a latch reinforcement 9 serving as a reinforcement plate which reinforces an attachment portion 7b to which a latch unit 6 is attached. The latch reinforcement 9 has: a body part 9a fixed to the attachment portion 7b at an inner panel 7; a pair of extension parts 9b extending form both side parts as seen in a vehicle width direction of the body part 9a; and first folded parts 9e in which the extension parts 9b are folded toward the outer panel 8. The extension parts 9b contact with the outer panel 8.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a vehicle backdoor structure.

  2. Description of the Related Art Conventionally, a vehicle back door structure described in Patent Document 1 and the like includes a lock mechanism for locking a lift gate.

  The lock mechanism has a U-shaped striker and a latch unit having a latch that engages with the striker. The latch unit is fixed to the inner panel inside the lift gate including the inner panel and the outer panel.

  A mounting portion of the inner panel to which the latch unit is mounted is reinforced by a latch reinforcement serving as a reinforcing plate.

  The latch reinforcement described in Patent Document 1 has a main body fixed to the inner panel, and a rear extension extending rearward from the vehicle body so as to extend from the rear end of the main body toward the outer panel. . The rear extension has the same width as the main body in the vehicle width direction.

  The rear extension portion secures the surface rigidity of the outer panel by supporting the outer panel from the front side of the vehicle body.

JP-A-2005-30390

  In the back door structure described in Patent Literature 1, since the outer panel is supported by the rear extending portion of the latch reinforcement, the range (width) in which the outer panel can be supported is narrow, and the main body of the latch reinforcement. The outer panel can be supported by the latch reinforcement only in the range of the width similar to the width of the outer panel.

  Therefore, for example, in a structure in which a flat portion that is considerably wider than the arrangement width of the main body of the latch reinforcement is formed at the lower end portion of the outer panel in order to attach a license plate of a vehicle such as a license plate, the outer panel has an outer panel. It is further disadvantageous in terms of surface rigidity.

  The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a back door structure capable of securing surface rigidity of an outer panel of a lift gate in a wide range using a reinforcing plate. .

  In order to solve the above problems, a back door structure according to the present invention includes a lift gate attached to an opening at a rear portion of a vehicle body so as to be openable and closable in an up-down direction, and when the lift gate is closed below the lift gate. A reinforcing plate for reinforcing a mounting portion to which a latch unit having a latch engaged with a striker provided on the vehicle body side is mounted, wherein the lift gate closes the lift gate. A body fixed to the mounting portion of the inner panel, the inner panel having an inner panel positioned inward of the vehicle in an extended state, and an outer panel positioned rearward of the inner body of the vehicle and positioned outside the vehicle. Part, a pair of extending parts extending from both sides in the vehicle width direction of the main body part, and the pair of extending parts facing the outer panel, respectively. Has a first folded portion of the pair, the return Ri, the extending portion is characterized in that abuts against the outer panel.

  According to this configuration, the reinforcing plate has the pair of extending portions extending from both sides in the vehicle width direction of the main body fixed to the mounting portion of the inner panel to which the latch unit is mounted. The pair of extending portions are folded back toward the outer panel at the rear of the vehicle body by the pair of first folding portions. The extension portion comes into contact with the outer panel. This allows the pair of extending portions to support the outer panel beyond the width of the main body, so that a wide range of surface rigidity of the outer panel can be secured by using the reinforcing plate.

  A flat portion on the rear panel side of the outer panel when viewed from the mounting portion has a wider width than the mounting portion and on which a license plate is mounted, and the first folded portion is formed of the main body portion. It is preferable that the extending portion is folded back from both side portions in the vehicle width direction to the flat portion located outside in the vehicle width direction.

  According to this configuration, even when the outer panel has a flat portion having a width wider than the mounting portion to which the latch unit is mounted for installing the license plate, the surface rigidity of the outer panel is ensured by using the reinforcing plate. It is possible.

  The extension portion includes an arm portion extending from the first folded portion toward the outer panel, a contact surface portion connected to the arm portion, and a second folded portion that folds the contact surface portion outwardly in the vehicle width direction. Preferably, the contact surface portion contacts the outer panel via an elastic body.

  According to this configuration, it is possible to secure a wide range of surface rigidity of the outer panel while suppressing the angle of the first folded portion between the main body and the arm of the extending portion. In addition, since the abutting surface portion abuts on the outer panel via the elastic body, the abutting structure itself does not affect the outer surface of the outer panel, and the outer panel is maintained while maintaining its appearance regardless of the layout of the outer surface of the outer panel. Surface rigidity can be ensured.

  It is preferable that the elastic body is an adhesive, and the extending portion is bonded to the outer panel by the adhesive.

  According to this configuration, the extension portion is adhered to the outer panel with an adhesive as an elastic body, so that the extension portion does not separate from the outer panel even when subjected to vibration during vehicle running, and reduces the surface rigidity of the outer panel. It is possible to secure it stably.

  The extension portion includes an arm portion extending from the first folded portion toward the outer panel, a contact surface portion connected to the arm portion, and a second folded portion that folds the contact surface portion outwardly in the vehicle width direction. A license plate may be attached to an outer surface side of the outer panel so as to entirely cover a portion of the outer panel overlapping the contact surface portion, and the contact surface portion may be welded to the outer panel.

  According to this configuration, the entire contact portion (that is, the entire portion of the outer panel overlapping with the contact surface portion) is hidden by the license plate without using a separate member and influencing the outer appearance of the outer panel by welding. By doing so, it is possible to secure the surface rigidity of the outer panel without impairing the appearance.

  It is preferable that a first reinforcing bead is formed on the contact surface.

  According to such a configuration, the contact surface portion can be reinforced by the first reinforcing beads.

  It is preferable that the first reinforcing bead is formed continuously from the contact surface portion to the arm portion so as to intersect the second folded portion.

  According to this configuration, the first reinforcing bead can reinforce the second folded portion and its peripheral portion, and the arm and the contact surface of the extension portion are folded at the second folded portion. It is possible to prevent a decrease in rigidity due to the above.

  It is preferable that the first folded portion bends the extended portions so that the pair of extended portions are separated from each other and project obliquely upward as they go rearward of the vehicle body.

  According to this configuration, the extension portions are folded back by the first folding portion so as to protrude obliquely upward and away from each other as they go rearward of the vehicle body. In this case, it is possible to secure a wide range of surface rigidity of the outer panel.

  It is preferable that a second reinforcing bead extending across the first folded portion is further formed.

  According to such a configuration, the first folded portion can be reinforced by the second reinforcing bead. Therefore, it is possible to prevent the rigidity of the structure having the first folded portion from being reduced, and to prevent the first folded portion from increasing the angle between the extending portion and the main body.

  ADVANTAGE OF THE INVENTION According to the back door structure of this invention, surface rigidity of the outer panel of a lift gate can be ensured in a wide range using a reinforcing plate.

It is a longitudinal section showing the back door structure concerning an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing a state where a latch unit of FIG. 1 is removed. FIG. 2 is a diagram showing a state in which a latch reinforcement and a latch unit as a reinforcing plate are attached to the inner panel of FIG. 1 as viewed from a vehicle rear side. FIG. 2 is a diagram showing a state in which a latch reinforcement is attached to the inner panel of FIG. 1, as viewed from a vehicle rear side. FIG. 2 is a cross-sectional view showing an arrangement of a latch reinforcement and a plane portion of an outer panel in the lift gate of FIG. 1. It is a perspective view of the latch reinforcement of FIG. It is a top view of the latch reinforcement of FIG. It is a front view of the latch reinforcement of FIG. It is sectional drawing of the conventional back door structure. FIG. 10 is a perspective view of the latch reinforcement of FIG. 9.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 to 5, a back door structure 1 of a vehicle according to the present embodiment is configured to lock a lift gate 2 attached to an opening at a rear portion of a vehicle body so as to be openable and closable in a vertical direction. , And a latch reinforcement 9 as a reinforcing plate.

  The lift gate 2 is a plate-shaped part which is attached to an opening at the rear of the vehicle body so as to be openable and closable in a vertical direction. As shown in FIGS. 1 to 5, the lift gate 2 includes an inner panel 7 located inside the vehicle with the lift gate 2 closed, and a vehicle body rearward of the inner panel 7 (in the direction of arrow R). And an outer panel 8 located outside the vehicle. The lift gate 2 is formed in a hollow plate shape by joining the peripheral edges of the inner panel 7 and the outer panel 8 by a process having a high sealing property by a hemming process or the like.

  An opening 7a through which a latch 6a and the like of a latch unit 6 to be described later is externally formed is formed in a lower portion of the inner panel 7. At the periphery of the opening 7a of the inner panel 7, an attachment portion 7b, which is a surface to which the latch unit 6 is attached, is formed.

  A flat portion 8a is formed in a portion of the outer panel 8 on the rear side of the vehicle body (the side to which the arrow R points) when viewed from the mounting portion 7b. A license plate 12 such as a license plate is attached to the flat portion 8a via a plate support member 13. In the vehicle width direction W in FIG. 5, the width W1 of the flat portion 8a is set to be wider than the width W2 of the mounting portion 7b of the inner panel 7.

  The lock mechanism 3 includes a striker 5 which is a U-shaped fitting provided on a rear end portion 4 on the vehicle body side, a latch unit 6 provided below the lift gate 2 and having a latch 6a which engages with the striker 5; Having.

  Specifically, as shown in FIG. 1, the latch unit 6 includes a latch 6a that engages with the striker 5, a driving unit 6b such as an electromagnetic solenoid that applies a rotational driving force to the latch 6a, And a bracket 6c for swingably supporting a position for engaging with the position 5 and a position for releasing the engagement.

  The drive unit 6b of the latch unit 6 is fixed to a mounting portion 7b around the opening 7a of the inner panel 7 with a bolt or the like inside the lift gate 2. On the other hand, the latch 6a of the latch unit 6 and the bracket 6c that supports the latch 6a extend outside the lift gate 2 from below the lift gate 2 through the opening 7a of the inner panel 7.

  A mounting portion 7b of the inner panel 7 to which the latch unit 6 is mounted (that is, a portion around the opening 7a) is reinforced by a latch reinforcement 9 so that the lift gate 2 is not damaged when an excessive external force is applied. Have been.

  That is, the latch reinforcement 9 is a reinforcing plate that reinforces the outer panel 8 from the inside of the lift gate 2, and the lower part of the lift gate 2 is connected to the striker 5 provided on the vehicle body when the lift gate 2 is closed. The portion to which the latch unit 6 having the latch 6a to be engaged is attached (specifically, the attachment portion 7b of the inner panel 7) is reinforced.

  The latch reinforcement 9 is manufactured by subjecting a plate-shaped member such as steel to processing such as pressing. The thickness of the latch reinforcement 9 is set to be larger than the thickness of the inner panel 7 and the outer panel 8. For example, when the thickness of the inner panel 7 and the outer panel 8 is about 0.6 mm, the latch reinforcement 9 is set to about 1.2 mm.

  As shown in FIGS. 6 to 8, the latch reinforcement 9 includes a main body 9 a, a pair of extending portions 9 b extending from both sides 9 a 1 in the vehicle width direction of the main body 9 a, and a pair of extending portions toward the outer panel 8. There is provided a pair of first folded portions 9e which respectively fold the protruding portions 9b.

  The main body 9a is fixed to the inner surface (inside of the lift gate 2) of the mounting portion 7b of the inner panel 7 by welding or the like. In the present embodiment, the main body 9a is fixed to the mounting portion 7b with a plurality of welding spots 10 shown in FIGS.

  As shown in FIGS. 5 to 8, each of the pair of extending portions 9 b is folded back from the vehicle width direction side portions 9 a 1 of the main body 9 a by the pair of first folded portions 9 e so as to extend toward the outer panel 8. Have been.

  The first folded portion 9e is a valley line extending toward the outside of the vehicle body width direction (the side to which the arrow WO points) toward the rear of the vehicle body (the direction of the arrow R). Each extension portion 9b is folded back upward (in the direction of arrow HA) and toward the rear of the vehicle body (in the direction of arrow R) at the first folded portion 9e (ie, stands up so as to face the rear of the vehicle body). .

  In the present embodiment, the first folded portion 9e is a flat portion 8a (see FIG. 1) of the outer panel 8 located on the vehicle width direction outer side (the side to which the arrow WO in FIG. 6 points) from the vehicle width direction both side portions 9a1 of the main body portion 9a.参照 2 参照).

  Moreover, the first folded portion 9e extends so that the pair of extending portions 9b are separated from each other and project diagonally upward (in the direction of the arrow HA and in the direction of the arrow WO) toward the rear of the vehicle body (in the direction of the arrow R). The protrusion 9b is folded back (see FIGS. 1 and 2 and FIG. 6).

  As shown in FIGS. 6 to 8, each extension portion 9b specifically has an arm portion 9d, a contact surface portion 9f, and a second folded portion 9g.

  The arm portion 9d is a portion extending from the first folded portion 9e toward the outer panel 8. The arm portion 9d is, specifically, a triangular portion having the first folded portion 9e and the second folded portion 9g as two sides.

  The contact surface 9f is a portion that continues to the arm 9d.

  The second folded portion 9g folds the contact surface portion 9f outward in the vehicle width direction (the side to which the arrow WO points).

  The second folded portion 9g is, specifically, a mountain line extending upward (in the direction of arrow HA) toward the front of the vehicle body (in the direction of arrow F). The contact surface portion 9f is folded back by the second folded portion 9g so as to be directed outward (in the direction of the arrow WO) and slightly upward (in the direction of the arrow HA) in the vehicle width direction (that is, toward the rear of the vehicle body). It is spread outward in the vehicle width direction).

  As shown in FIGS. 1 to 5, when the main body 9 a of the latch reinforcement 9 is fixed to the mounting portion 7 b of the inner panel 7 by welding or the like, each contact surface portion 9 f of the pair of extending portions 9 b is provided. Abuts on the flat portion 8a of the outer panel 8 via the adhesive 11 (specifically, is bonded).

  The adhesive 11 is a kind of elastic body, and adheres the contact surface 9 f of the extension 9 b to the flat portion 8 a of the outer panel 8. The adhesive 11 has elasticity after curing such as an epoxy resin, and adheres the contact surface 9f to the flat surface 8a while being interposed between the contact surface 9f and the flat surface 8a. Thus, the flat surface portion 8a of the outer panel 8 can be reinforced (supported) from the inside of the lift gate 2 by the contact surface portion 9f of the latch reinforcement 9. In the present embodiment, the adhesive 11 is formed at six locations per one contact surface 9f, but the present invention is not limited to this, and is formed according to the area and shape of the contact surface 9f. The location and number may be set as appropriate.

  Two first reinforcing beads 9h are formed on the contact surface 9f of the present embodiment. The first reinforcing bead 9h is a linear portion formed by bending or bending the contact surface portion 9f in the thickness direction, and reinforces the contact surface portion 9f.

  Also, the upper first reinforcing bead 9h is formed continuously from the contact surface 9f to the arm 9d so as to intersect the second folded portion 9g and reinforce the second folded portion 9g and its peripheral portion. .

  A convex portion 9j is formed on the contact surface portion 9f in order to secure a thickness at which the adhesive 11 functions as an elastic body when the flat surface 8a of the outer panel 8 is bonded by the adhesive 11.

  Further, in the latch reinforcement 9 of the present embodiment, a second reinforcing bead 9i is formed to reinforce the first folded portion 9e and its peripheral portion. The second reinforcing bead 9i is formed so as to extend crossing the first folded portion 9e. Similarly to the first reinforcing bead 9h, the second reinforcing bead 9i is a linear portion formed by bending or bending the main body 9a and the arm 9d around the first folded portion 9e in the thickness direction. .

  Further, in the present embodiment, in the latch reinforcement 9 of the present embodiment, the extension portions 9k (FIGS. 6 to 6) extending from both sides 9a1 in the vehicle width direction of the main body 9a toward the rear of the vehicle body (in the direction of arrow R). 7) is formed. By the extension portion 9k, it is possible to reinforce the end portion of the first folded portion 9e on the rear side of the vehicle body (the side to which the arrow R points) and its peripheral portion.

(Features of the present embodiment)
(1)
In the back door structure 1 of the present embodiment, the latch reinforcement 9 includes a pair of main body 9a fixed to the mounting portion 7b of the inner panel 7 to which the latch unit 6 is mounted, extending from both sides 9a1 in the vehicle width direction. It has an extension 9b. The pair of extending portions 9b are folded back toward the outer panel 8 at the rear of the vehicle body (in the direction of arrow R) by the pair of first folding portions 9e. The extension portion 9b contacts the outer panel 8 (contacts with the adhesive 11 in the present embodiment). As a result, the pair of extending portions 9b support the outer panel 8 beyond the width of the main body 9a. Therefore, it is possible to secure the surface rigidity of the outer panel 8 in a wide range using the latch reinforcement 9. .

(2)
In the back door structure 1 of the present embodiment, a portion of the outer panel 8 on the rear side of the vehicle body (the side to which the arrow R points) as viewed from the mounting portion 7b has a width wider than the mounting portion 7b (width W2 in FIG. 5). , A flat portion 8a (width W1) to which a license plate is attached is formed. The first folded portion 9e folds the extending portion 9b from both sides 9a1 in the vehicle width direction of the main body 9a toward the flat portion 8a located outside the main body 9a.

  In this configuration, even when a flat portion 8a having a wider width than the mounting portion 7b to which the latch unit 6 is mounted for installing the license plate is formed on the outer panel 8, the outer panel 8 is provided by using the latch reinforcement 9. It is possible to secure the surface rigidity at.

(3)
In the back door structure 1 of the present embodiment, the extension portion 9b includes an arm portion 9d extending from the first folded portion 9e toward the outer panel 8, a contact surface portion 9f continuous with the arm portion 9d, and an outward portion in the vehicle width direction. And a second folded portion 9g that folds the contact surface portion 9f. The contact surface portion 9f contacts the outer panel 8 via an elastic body such as the adhesive 11. With this configuration, it is possible to secure a wide range of surface rigidity of the outer panel 8 while suppressing the angle between the main body portion 9a and the arm portion 9d of the extension portion 9b at the first folded portion 9e. In addition, since the contact surface portion 9f contacts the outer panel 8 via an elastic material such as the adhesive 11, the contact structure itself does not affect the outer surface of the outer panel 8, and the layout on the outer surface of the outer panel 8 can be improved. Irrespective of this, it is possible to secure the surface rigidity of the outer panel 8 while maintaining the appearance.

(4)
In the back door structure 1 of the present embodiment, an adhesive 11 such as a urethane adhesive is used as the elastic body. The contact surface portion 9f of the extension portion 9b is adhered to the flat portion 8a of the outer panel 8 by the adhesive agent 11. In this configuration, since the extension portion 9b is adhered to the outer panel 8 by the adhesive 11 as an elastic body, the extension portion 9b does not separate from the outer panel 8 even when subjected to vibration or the like during running of the vehicle. Can be secured stably.

  In the present embodiment, the adhesive 11 is used as the elastic body. However, the present invention is not limited to this, and the extension 9b can contact the outer panel 8 via the elastic body. Then, various elastic bodies other than the adhesive 11 can be adopted as the elastic body of the present invention. As the elastic body other than the adhesive 11, for example, a cushioning material made of rubber, urethane, or the like may be used. Also in this case, the pair of extended portions 9b formed by folding back from both sides of the main body 9a of the latch reinforcement 9 (reinforcement plate) abut on the outer panel 8 via the elastic body, so that the surface rigidity of the outer panel 8 is increased. It is possible to secure.

(5)
In the back door structure 1 of the present embodiment, the contact surface 9f can be reinforced by the first reinforcing beads 9h formed on the contact surface 9f.

(6)
In the back door structure 1 of the present embodiment, the first reinforcing bead 9h is formed continuously from the contact surface 9f to the arm 9d so as to intersect the second folded portion 9g. With this configuration, the reinforcing bead can reinforce the second folded portion 9g and its peripheral portion, and the arm 9d and the contact surface portion 9f of the extending portion 9b are folded at the second folded portion 9g. It is possible to prevent a decrease in rigidity due to the above.

(7)
In the back door structure 1 of the present embodiment, the first folded portion 9e folds the extending portion 9b such that the pair of extending portions 9b are separated from each other and project diagonally upward as they go rearward of the vehicle body.

  In this configuration, since the pair of extended portions 9b are folded back by the pair of first folded portions 9e so as to be separated from each other and protrude obliquely upward toward the rear of the vehicle body, the latch unit 6 has a simple structure. It is possible to secure a wide range of surface rigidity of the outer panel 8 above the mounting portion 7b.

  The outer panel 8 is rigidly secured at its lower end because it is connected to the inner panel by hemming or the like, but it is difficult to secure surface rigidity as the outer panel 8 moves upward from the lower end. However, in the above configuration, since the pair of extending portions 9b are folded back by the first folded portion 9e so as to project diagonally upward, the pair of extending portions 9b are separated upward from the lower end of the outer panel 8. This makes it possible to secure the surface rigidity by contacting the bent portion.

(8)
In the back door structure 1 of the present embodiment, a second reinforcing bead extending crossing the first folded portion 9e is formed. With this configuration, the first folded portion 9e can be reinforced by the second reinforcing bead. Therefore, it is possible to prevent the rigidity of the structure having the first folded portion 9e from being reduced, and prevent the first folded portion 9e from increasing the angle between the extending portion 9b and the main body 9a. is there.

(Modification)
In the example shown in FIG. 3, the upper part of the contact surface 9f of the latch reinforcement 9 is not within the range of the license plate 12, but the entire contact surface 9f is set within the range of the license plate 12. Alternatively, the contact surface portion 9f may be welded to the outer panel 8.

  That is, the modified example of the present invention will be described with reference to FIGS. 3 and 5 to 6. The extending portion 9 b includes an arm portion 9 d extending from the first folded portion 9 e toward the outer panel 8 and an arm portion 9 d. It has a continuous contact surface portion 9f and a second folded portion 9g that turns the contact surface portion 9f toward the outside in the vehicle width direction (toward the side where the arrow WO in FIG. 6 is directed). The license plate 12 may be attached so as to cover the entire portion of the outer panel 8 overlapping the surface portion 9f, and the contact surface portion 9f may be welded to the outer panel 8.

  According to such a configuration, without using a separate member, the influence on the external appearance of the outer panel 8 due to welding is reduced by the entire contact portion (that is, the entire portion of the outer panel 8 overlapping the contact surface portion 9f). It is possible to secure the surface rigidity of the outer panel 8 without hiding it by the license plate 12 and without impairing the appearance.

(Explanation of comparison between the present embodiment and the prior art)
Next, the back door structure of the present embodiment (see FIGS. 1 to 8) will be described in comparison with a vehicle back door structure (FIGS. 9 to 10) described in Patent Document 1 as a conventional technique.

  As shown in FIG. 9, a vehicle back door structure 41 described in Patent Document 1 locks a lift gate 42 attached to an opening at the rear of a vehicle body so as to be openable and closable in a vertical direction. And a lock mechanism 43 for locking.

  The lock mechanism 43 includes a striker 45, which is a U-shaped bracket provided on a rear end portion 44 on the vehicle body side, and a latch unit 46 provided below the lift gate 42 and having a latch 46a that engages with the striker 45. Having.

  The lift gate 42 has an inner panel 47 located inside the vehicle with the lift gate 42 closed, and an outer panel 48 located rearward of the vehicle body (in the direction of arrow R) with respect to the inner panel 47 and located outside the vehicle. doing.

  The latch unit 46 is fixed to the inner panel 47 inside the lift gate 42. The latch 46 a of the latch unit 46 extends outside the lift gate 42 from below the lift gate 42 through the opening 47 a of the inner panel 47.

  Here, the attachment portion 47b of the inner panel 47 to which the latch unit 46 is attached (that is, the portion around the opening 47a) is made of steel or the like so as not to be damaged when an excessive external force is applied to the lift gate 42. It is reinforced by a latch reinforcement 49 as a reinforcing plate.

  As shown in FIG. 10, the latch reinforcement 49 described in Patent Document 1 includes a main body 49a fixed to a portion 47b of the inner panel 47 to which the latch unit 46 is attached, and a rear end of the main body 47a. A rear extension 49b extending rearward of the vehicle body (in the direction of arrow R) so as to extend toward the outer panel 48; The rear extension 49b has the same width in the vehicle width direction as the main body 49a.

  The main body 49a of the latch reinforcement 49 is firmly fixed to the inner surface of the inner panel 47 by welding or the like. For example, the main body portion 49a is welded to a mounting portion 47b around the opening 47a in the inner panel 47 at a welding point 50 shown in FIGS.

  The main body 49a of the latch reinforcement 49 has an opening 49c formed at a position corresponding to the opening 47a of the inner panel 47, and does not prevent the latch 46a from projecting outside.

  The rear extension 49b of the latch reinforcement 49 is in contact with the outer panel 48 located on the vehicle rear side (the side to which the arrow R points) of the latch reinforcement 49 by the adhesive 51. Thus, the rear extension portion 49b of the latch reinforcement 49 supports the outer panel 48 from the front side of the vehicle body (the side to which the arrow F points), so that the outer panel at the rear side of the latch unit 46 (the side to which the arrow R points). 48 surface rigidity is secured.

  However, the back door structure 41 described in Patent Literature 1 has a structure in which the outer panel 48 is supported by a rear extension 49b extending rearward from the rear end of the main body 49a of the latch reinforcement 49. For this reason, the range (width) in which the outer panel 48 can be supported is narrow, and the outer panel 48 can be supported by the latch reinforcement 49 only in the same range as the width of the main body 49 a of the latch reinforcement 49. Can not.

  Particularly, in order to attach a license plate of a vehicle such as a license plate, a flat portion (for example, a flat surface of the outer panel 8 shown in FIG. 5) which is considerably wider than the width of the main body portion 49a of the latch reinforcement 49 at the lower end of the outer panel 48. The structure in which the portion 8a) is formed is further disadvantageous in terms of the surface rigidity of the outer panel.

  On the other hand, in the back door structure of the present embodiment, as shown in (1) of the above (characteristics of the present embodiment), the latch reinforcement 9 is formed by a mounting portion 7b of the inner panel 7 to which the latch unit 6 is mounted. And a pair of extending portions 9b extending from both sides 9a1 in the vehicle width direction of the main body 9a fixed to the main body 9a. The pair of extending portions 9b are folded back toward the outer panel 8 at the rear of the vehicle body (in the direction of arrow R) by the pair of first folding portions 9e, and are in contact with the outer panel 8 via the adhesive 11.

  Therefore, in the back door structure of the present embodiment, the pair of extending portions 9b can support the outer panel 8 beyond the width of the main body 9a. As a result, it is possible to secure a wider range of surface rigidity of the outer panel 8 as compared with the above-mentioned conventional rearward extending portion 49b shown in FIGS.

REFERENCE SIGNS LIST 1 back door structure 2 lift gate 5 striker 6 latch unit 6a latch 7 inner panel 7b mounting part 8 outer panel 8a plane part 9 latch reinforcement (reinforcement plate)
9a Main body 9b Extension 9d Arm 9e First turn 9f Contact surface 9g Second turn 9h First reinforcing bead 9i Second reinforcing bead 11 Adhesive (elastic body)
12 License plate

Claims (9)

A lift gate attached to the opening at the rear of the vehicle body to be openable and closable in the vertical direction,
A back door structure for a vehicle, comprising: a lower portion of the lift gate, a reinforcing plate for reinforcing a mounting portion to which a latch unit having a latch engaged with a striker provided on a vehicle body side when the lift gate is closed is mounted. And
The lift gate has an inner panel located inside the vehicle with the lift gate closed, and an outer panel located rearward of the vehicle body and outside the vehicle with respect to the inner panel,
The reinforcing plate,
A main body fixed to the mounting portion of the inner panel,
A pair of extending portions extending from both sides in the vehicle width direction of the main body,
A pair of first folded portions each of which folds the pair of extending portions toward the outer panel,
Has,
The extension portion is in contact with the outer panel;
A backdoor structure for a vehicle, comprising: A flat portion to which a license plate is attached is formed in a portion of the outer panel on the vehicle body rear side when viewed from the attachment portion, having a wider width than the attachment portion,
The first folded portion is configured to fold the extending portion from both sides in the vehicle width direction of the main body to the flat portion located outside in the vehicle width direction.
The vehicle backdoor structure according to claim 1. The extension portion,
An arm extending from the first folded portion toward the outer panel;
An abutting surface portion connected to the arm portion;
A second folded portion that folds the contact surface portion outwardly in the vehicle width direction,
The vehicle back door structure according to claim 1, wherein the contact surface portion contacts the outer panel via an elastic body. The elastic body is an adhesive,
The extension portion is adhered to the outer panel by the adhesive,
The vehicle backdoor structure according to claim 3. The extension portion,
An arm extending from the first folded portion toward the outer panel;
An abutting surface portion connected to the arm portion;
A second folded portion that folds the contact surface portion outwardly in the vehicle width direction,
On the outer surface side of the outer panel, a license plate is attached so as to cover the entire outer panel portion overlapping the contact surface portion,
The vehicle back door structure according to claim 1, wherein the contact surface portion is welded to the outer panel. A first reinforcing bead is formed on the contact surface portion;
A backdoor structure for a vehicle according to any one of claims 3 to 5. The first reinforcing bead is formed continuously from the contact surface portion to the arm portion so as to intersect the second folded portion.
The vehicle back door structure according to claim 6. The first folded portion folds the extended portion so that the pair of extended portions are separated from each other and project diagonally upward as going toward the rear of the vehicle body,
A back door structure for a vehicle according to any one of claims 1 to 7. A second reinforcing bead extending across the first folded portion is further formed.
A vehicle backdoor structure according to any one of claims 1 to 8.

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