JP2012116388A - Reinforcing structure of back door for vehicle, and reinforcing structure of tail gate for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure of a back door for a vehicle and a reinforcing structure of a tail gate for the vehicle which suppresses the deformation of the back door.SOLUTION: The back door 100 is provided with a door hinge reinforcement 160 and an intermediate reinforcement 170. A joint T between the lower end of the door hinge reinforcement 160 and the upper end of a vertical part of the intermediate reinforcement 170 is positioned between an upper part G1 and a lower part G2. Therefore, so-called "two-step fold" in which folding at the upper part G1 and the lower part G2 is substantially eliminated so that the deformation of the back door 100 is suppressed.

Description

  The present invention relates to a reinforcing structure for a vehicle back door and a reinforcing structure for a vehicle tailgate.

  2. Description of the Related Art A vehicle is known in which luggage can be taken in and out of a luggage room on the rear side of a vehicle through a back door opening at the rear end of the vehicle that is opened and closed by a back door and a tailgate.

  In Patent Document 1, in a tailgate in which an inner panel is combined with an outer panel, the inner panel is composed of a lower panel body and an upper window frame, and is cut up and raised in the panel body to reversely reinforce the hat shape. Forming an opening larger than the opening created by cutting and raising on both sides of the reinforcing part, spanning a reinforcing plate with a hat section in the opposite direction between the upper end of the reinforcing part and the lower corner of the window frame part. A vehicle tailgate reinforcement structure has been proposed in which a plate is welded to a lower corner of a window frame portion, a panel main body portion, and a reinforcement portion (see Patent Document 1).

  Here, the vehicle back door is supported by a door hinge attached to the upper end of the back door opening, and is configured to open and close the back door opening by rotating in the vertical direction around the door hinge. There are many cases. In addition, in order to reduce the opening operation force of the vehicle back door and maintain the open state, a configuration in which a damper stay is spanned between the vehicle back door and the body forming the periphery of the back door opening is known. It has been.

  In the vehicular back door having such a configuration, in a closed state, a reaction force to be extended by the damper stay is transmitted to the vehicular back door. If the rigidity of the vehicle back door is insufficient, the vehicle back door may be deformed by the damper stay.

  In addition, in the case of a structure in which a tailgate is provided on the lower side of the vehicle backdoor in the vehicle vertical direction at the backdoor opening, when the lower end of the closed vehicle backdoor is coupled to the upper end of the tailgate, If the rigidity of the vehicle is insufficient, the lower end of the vehicle back door may be displaced toward the vehicle front side, and the vehicle back door may be deformed.

Japanese Patent Laid-Open No. 10-100654

  In view of the above, an object of the present invention is to provide a reinforcing structure for a vehicle back door and a reinforcing structure for a vehicle tailgate that suppress deformation of the vehicle back door.

  The invention according to claim 1 is a reinforcing structure for a vehicle back door that opens and closes a back door opening at the rear end of the vehicle, and is provided at an upper end of the vehicle back door, and around the back door opening. A door hinge joined to an upper end portion of the body to be configured; a window frame portion provided on a lower side in the vehicle vertical direction of the door hinge in the vehicle back door; and one end portion rotatably attached to the vehicle back door. A damper stay that is rotatably attached to the body that forms the periphery of the back door opening, and a side portion on the vehicle width direction outer side of the window frame portion from a portion where the door hinge is provided. Along with this, the vehicular back door is positioned so that the lower end portion is positioned on the lower side in the vehicle vertical direction with respect to the upper portion where the vehicular back door is to be deformed by the reaction force of the damper stay. The vehicular back door is formed by a reaction force of the damper stay along a side portion of the first reinforcing member provided on the outer side in the vehicle width direction of the window frame portion from the vehicle vertical direction lower side of the window frame portion. A second reinforcing member provided on the vehicle back door so that the upper end is positioned above the lower part to be deformed and in the vicinity of the lower end of the first reinforcing member.

  In the first aspect of the invention, the lower end portion of the first reinforcing member provided along the side portion on the vehicle width direction outer side of the window frame portion from the portion where the door hinge is provided, and the vehicle frame vertical direction lower side of the window frame portion. The upper end of the second reinforcing member provided along the side of the window frame portion on the outer side in the vehicle width direction and the joint (boundary) portion of the vehicle back door are deformed by the reaction force of the damper stay. It is comprised so that it may be located between the upper part and lower part which do.

  Here, if the rigidity of the first reinforcing member and the second reinforcing member is increased by wrapping the lower end portion of the first reinforcing member and the upper end portion of the second reinforcing member, for example, it is difficult to adjust the installation of the door hinge. It may become.

  However, the joint (boundary) between the lower end of the first reinforcing member and the upper end of the second reinforcing member is between the upper part and the lower part where the vehicular back door is to be deformed by the reaction force of the damper stay. By being comprised so that it may be located in, the deformation | transformation of the vehicle back door by the reaction force of a damper stay is suppressed, without making the lower end part of a 1st reinforcement member and the upper end part of a 2nd reinforcement member wrap.

  The invention of claim 2 is a reinforcing structure for a vehicle back door that opens and closes a back door opening at the rear end of the vehicle, and is provided at an upper end of the vehicle back door, and is arranged around the back door opening. A door hinge joined to an upper end portion of the body to be configured; a window frame portion provided on a vehicle vertical direction lower side of the door hinge in the vehicle back door; and a vehicle vertical direction of the window frame portion in the vehicle back door A damper stay having one end rotatably attached to the upper side of the upper side and the other end rotatably attached to the body constituting the periphery of the back door opening, and a portion provided with the door hinge The vehicular back door is positioned so that a lower end portion thereof is positioned on a lower side in the vehicle vertical direction with respect to a mounting portion of one end portion of the damper stay along a side portion of the window frame portion on the outer side in the vehicle width direction. A first reinforcing member provided in the vehicle frame, from a vehicle vertical direction lower side of the window frame portion along a side portion of the window frame portion outside in the vehicle width direction, from a vehicle vertical direction substantially central portion of the window frame portion. And a second reinforcing member provided on the vehicular back door so that the upper end portion is positioned near the lower end portion of the first reinforcing member.

  In the invention of claim 2, the lower end portion of the first reinforcing member provided along the side portion on the vehicle width direction outer side of the window frame portion from the portion where the door hinge is provided, and the vehicle frame vertical lower side of the window frame portion The upper end of the second reinforcing member provided along the side of the window frame portion outside in the vehicle width direction and the joint (boundary) portion are the part where the damper stay is attached and the vehicle frame above and below the window frame portion. It is provided between the central part of the direction.

  That is, a joint (boundary) portion is arranged between a portion where the damper stay to which the vehicle back door is to be deformed by the reaction force of the damper stay is attached and the vehicle frame vertical center portion in the vehicle vertical direction. . Therefore, deformation of the vehicle back door due to the reaction force of the damper stay is suppressed without increasing the rigidity by wrapping the lower end portion of the first reinforcing member and the upper end portion of the second reinforcing member.

  According to a third aspect of the present invention, the second reinforcing member includes a vertical portion formed along the side portion from the vehicle vertical direction lower side of the window frame portion, and the vehicle vertical direction of the window frame portion from the vertical portion. A lateral portion extending inward in the vehicle width direction along the lower side portion in the lower direction.

  In the invention of claim 3, since the second reinforcing member is provided with a lateral portion extending inward in the vehicle width direction along the lower side portion of the window frame portion on the vehicle vertical direction lower side, the rigidity of the window frame portion is provided. As a result, the deformation of the vehicle width back door is further suppressed.

  According to a fourth aspect of the present invention, the lower end portion of the vehicle back door according to any one of the first to third aspects is provided at the lower side in the vehicle vertical direction of the back door opening, and the upper end portion is the upper end portion. The vehicle tailgate includes a tailgate panel that forms both sides of the vehicle tailgate in the vehicle front-rear direction and a vehicle width direction of the vehicle tailgate. A side panel that constitutes both sides of the vehicle, and a reinforcing bracket is provided on both outer sides in the vehicle width direction at an upper end portion of the vehicle tailgate, and the reinforcing bracket is joined to the tailgate panel and the side panel. Has been.

  In the invention of claim 4, since the reinforcing brackets provided on both outer sides in the vehicle width direction at the upper end of the vehicle tailgate are joined to the tailgate panel and the side panel, the rigidity of the vehicle tailgate is improved. To do. Therefore, the position shift of the lower end portion of the vehicle back door coupled to the vehicle tailgate to the vehicle front side is suppressed, and as a result, deformation of the vehicle back door is suppressed.

  According to invention of Claim 1 or Claim 2, a deformation | transformation of the vehicle back door can be suppressed.

  According to invention of Claim 3, compared with the structure in which the 2nd reinforcement member is not provided with the horizontal part, a deformation | transformation of the vehicle back door can be suppressed.

  According to the fourth aspect of the present invention, as compared with the configuration in which the reinforcing gate is coupled to the vehicle tailgate in which the tailgate panel and the side panel are not joined, the position shift of the lower end portion of the vehicle backdoor to the vehicle front side is achieved. Can be suppressed.

It is a perspective view which shows the vehicle rear-end part of a vehicle provided with the back door and tailgate which concern on one Embodiment of this invention. It is a perspective view which shows the state which the back door of the vehicle shown in FIG. 1 opened. It is the front view which looked at the back door of the vehicle shown in FIG. 1 from the vehicle interior side. It is the enlarged view which expanded the principal part of the front view of the back door shown in FIG. (A) is sectional drawing of the back door corresponding to the cross section along the AA line of FIG. 3, (B) is sectional drawing of the back door corresponding to the cross section along the BB line of FIG. is there. (A) is a horizontal sectional view showing the outer portion of the back door in the vehicle width direction and the body side, (B) is a perspective view showing a side cushion provided on the body side, and (C) is a comparative example. It is a perspective view which shows the side cushion. (A) is a perspective view which shows the tailgate of the vehicle shown in FIG. 1, (B) is a disassembled perspective view of the state which is not joined by the reinforcement bracket of (A). It is explanatory drawing for demonstrating the displacement of a back door. It is a figure which shows the displacement distribution of the tailgate of this embodiment, (B) is a figure which shows the displacement distribution of the comparative example which is not joined by the reinforcement bracket.

  1 to 7, an embodiment of a back door to which a vehicle back door reinforcement structure of the present invention is applied and an embodiment of a tail gate to which a vehicle tail gate reinforcement structure of the present invention is applied The form will be described. In addition, arrow UP in a figure shows a vehicle up-down direction upper side, arrow FR shows a vehicle front-back direction front side, and arrow OUT shows a vehicle width direction outer side. Further, the right side member or the like as viewed from the vehicle rear side to the vehicle front side may be described by adding R after the reference numeral and the left member or the like by adding L after the reference numeral. Further, R and L are omitted when it is not necessary to distinguish between left and right.

<Vehicle rear structure>
FIG. 1 shows a rear portion of a vehicle 10 including a back door 100 and a tailgate 200 according to an embodiment of the present invention.

  The vehicle 10 is provided with a substantially rectangular back door opening 12 at the rear end of the vehicle (see also FIG. 2). The periphery of the back door opening 12 includes a D pillar 16 disposed on both outer sides in the vehicle width direction, a rear roof header 18 disposed on the vehicle upper side, and the like. The back door opening 12 is opened and closed by the back door 100 and the tailgate 200.

  A back door glass 190 is provided in a substantially upper half portion of the back door 100 in the vehicle vertical direction.

  As shown in FIG. 2, the back door 100 is rotatably supported by back door hinges 50 </ b> R and 50 </ b> L attached to the rear roof header 18 that forms the periphery of the upper end of the back door opening 12. The back door hinge 50 includes a rotation shaft (not shown) whose axial direction is the vehicle width direction, and the back door 100 rotates in the vehicle vertical direction (arrow K1 direction, see also FIG. 1) about the rotation axis of the back door hinge 50. As a result, the upper side of the back door opening 12 is opened and closed.

  Further, between the both ends of the upper side 154 of the upper side 154 in the vehicle width direction of the window frame 150 to be described later in the back door 100 and the rear roof header 18 constituting the upper end portion around the back door opening 12. A pair of damper stays 80R and 80L are stretched over.

  The damper stay 80 extends while rotating according to the opening degree of the back door 100. Then, when the damper stay 80 extends, the opening operation force of the back door 100 is reduced and the open state is maintained. That is, it is a flip-up type back door 100.

  As shown in FIG. 1, the tailgate 200 is rotatably supported by tailgate hinges 54 </ b> R and 54 </ b> L (see FIG. 7) attached to the floor rear end 20 constituting the lower end around the back door opening 12. Has been. The tailgate hinge 54 (see FIG. 7) has a rotation axis whose axial direction is the vehicle width direction, and is rotated in the vehicle vertical direction (arrow K2 direction) about the rotation axis, whereby the back door opening 12 The lower side of is opened and closed.

  And the back door opening part 12 is closed because the lower end part 100B of the back door 100 of a closed state wraps and couple | bonds with the vehicle rear side of the upper end part 200A of the tail gate 200 of a closed state. A locking device 192 that locks against the upper end portion 200 </ b> A of the tailgate 200 is provided at the lower end portion 100 </ b> B of the back door 100.

  Further, after releasing the lock, the closed back door 100 is opened by rotating upward (see FIG. 2), and the closed tailgate 200 is opened by rotating downward to open the back door opening 12. Is done.

  Further, as shown in FIG. 1, a luggage room 14 as a vehicle luggage compartment is provided on the vehicle rear side of the rear seat (not shown) (see also FIG. 2). Then, by opening (rotating) the back door 100 and the tailgate 200, the back door opening 12 is opened, so that luggage and the like can be taken in and out of the luggage room 14 (see also FIG. 2).

  In addition, since the vehicle 10 of this embodiment is configured to open and close the back door opening 12 by the back door 100 and the tailgate 200, the vehicle height is higher than, for example, a vehicle that is opened and closed only by the back door. The back door opening 12 has a wide configuration.

<Backdoor structure>
Next, the structure of the back door 100 will be described.

  As shown in FIG. 3, the back door 100 has a back door outer panel 130 (see also FIG. 5) and a back door inner panel 120 (see FIG. 5), which are joined by hemming at the periphery. It has a closed cross-sectional structure (see FIG. 5). FIG. 3 is a view of the back door 100 as seen from the outside of the passenger compartment without the back door outer panel 130. In addition, as shown in FIG. 2, a back door trim 194 as a back door interior material is provided on the side of the back door 100 in the vehicle compartment (inside the luggage room 14).

  As shown in FIG. 3, the back door 100 is provided with a window frame portion 150 into which a back door glass 190 (see FIGS. 1 and 2) is fitted. Although the window frame 150 has a substantially isosceles trapezoidal shape, the vehicle frame direction is slightly lower than the middle in the vehicle vertical direction of the side portions 152R and 52L outside the window frame 150 in the vehicle width direction. Curved portions 159R and 159L that are convex outward are formed. Although not shown in FIG. 3, a window frame 150 having the same shape is also formed on the back door inner panel 120 (see FIG. 5).

  One end portion 82 (see FIG. 2) of the damper stay 80 is rotatably attached to both end portions in the vehicle width direction of the upper side portion 154 constituting the upper side of the window frame portion 150 in the vehicle vertical direction. In addition, the site | part to which the one end part 82 (refer FIG. 2) of the damper stay 80 in the back door 100 is attached is called "damper stay attachment site | part 112R, 112L."

  The back door 100 is reinforced by being provided with door hinge reinforcements 160R and 160L as an example of a first reinforcement member, intermediate reinforcements 170R and 170L as an example of a second reinforcement member, and a lock reinforcement 140. (The rigidity of the back door 100 is improved).

  The door hinge reinforcement 160, the intermediate reinforcement 170, and the lock reinforcement 140 are provided between the back door outer panel 130 and the back door inner panel 120 constituting the back door 100, and are joined to the back door inner panel 120 (see FIG. 5).

  The door hinge reinforcements 160R and 160L are provided with dampers along the side portions 152R and 52L on the outer side in the vehicle width direction of the window frame portion 150 from the door hinge mounting portions 110R and 110L provided with the back door hinges 50R and 50L (see FIG. 2). The lower end portions 162R and 162L are provided on the lower side in the vehicle vertical direction with respect to the damper stay attaching portions 112R and 112L to which the one end portion 82 (see FIG. 2) of the stay 80 is attached.

  The intermediate reinforcements 170R and 170L are configured by vertical portions 172R and 172L and horizontal portions 174R and 174L.

  The vertical portions 172 of the intermediate reinforcements 170R and 170L extend in the vehicle vertical direction of the window frame portion 150 along the side portions 152R and 152L on the vehicle width direction outer side of the window frame portion 150 from the vehicle vertical direction lower side of the window frame portion 150. The upper end portions 176R and 176L are provided in the vicinity of the lower end portion 162 of the door hinge reinforcement 160 (see FIG. 4).

  Further, the horizontal portions 174R and 174L of the intermediate reinforcements 170R and 170L extend from the vertical portions 172R and 172L inward in the vehicle width direction along the lower side portion 156 of the window frame portion 150 on the vehicle vertical direction lower side. Is formed.

  As shown in FIG. 4, a boundary portion between a lower end portion 162 of the door hinge reinforcement 160 and an upper end portion 176 of the vertical portion 172 of the intermediate reinforcement 170 is defined as a joint T. Further, as will be described later, this joint T is provided so as to be positioned between the upper part G1 and the lower part G2 (see FIG. 7), which are bent parts due to the reaction force of the damper stay 80.

  The lock reinforcement 140 has a substantially rectangular shape in which the shape seen in the vehicle longitudinal direction is arranged with the vehicle width direction as the longitudinal direction. Further, the lock reinforcement 140 is provided at a position corresponding to the lock device 192 (see FIG. 1) in the lower end portion 100 </ b> B of the back door 100.

  As shown in FIG. 6A, a side stopper 300 is provided on the outer side in the vehicle width direction below the back door 100. The side stopper 300 is configured to contact the side cushion 320 provided on the body side in the back door 100 in the closed state. As shown in FIG. 6B, the portion of the side cushion 320 that contacts the side stopper 300 is composed of a wide groove portion 322 and a narrow convex rib portion 324, and is provided on the back door 100. The side stopper 300 is configured to contact the rib portion 324 of the side cushion 320.

<Tailgate structure>
Next, the structure of the tailgate 200 will be described.

  As shown in FIG. 7, the tailgate 200 has a substantially rectangular shape that is long in the vehicle width direction when viewed from the rear of the vehicle. The tailgate 200 includes a tailgate panel 202 that constitutes the vehicle front side (vehicle interior side) in the vehicle front-rear direction and a tailgate panel 204 that constitutes the vehicle rear side. Further, both outer sides in the vehicle width direction are constituted by a pair of left and right side panels 206R and 206L.

  The tailgate panel 202 on the front side of the vehicle is folded back toward the vehicle rear side and joined to the upper end portion of the tailgate panel 204 on the vehicle rear side. The folded portion constitutes the upper end portion 200A of the tailgate 200.

  Reinforcing brackets 220R and 220L are provided on both outer sides in the vehicle width direction of the upper end portion 200A of the tailgate 200. The reinforcing brackets 220R and 220L are joined to the tailgate panels 202 and 204 and the side panels 206R and 206L.

  As shown in FIG. 7B, when the reinforcing brackets 220R and 220L are not joined, both outer sides in the vehicle width direction at the upper end portion 200A of the tailgate 200 (the tailgate panels 202 and 204 and the side panels 206R). , 206L and the boundary portion) have gaps NR and NL. Then, the gaps NR and NL are closed by joining the reinforcing brackets 220R and 220L.

<Action and effect>
Next, the operation and effect of this embodiment will be described.

  First, the comparative example to which the present invention is not applied, specifically, the door hinge reinforcement 160, the intermediate reinforcement 170, and the lock reinforcement 140 are not joined to the back door of the comparative example not provided by the reinforcing bracket 220. Consider the tailgate of the comparative example.

  FIG. 8 shows the displacement of the back door in the closed state. In FIG. 8, G in each graph indicates the displacement of the back door of the comparative example in the closed state, and E in each graph indicates the displacement of the back door 100 of the present embodiment in the closed state.

  FIG. 9 is a diagram showing the displacement distribution of the tailgate in the closed state. Note that the denser (darker) the dots in the figure, the greater the displacement. 9A shows the displacement of the tailgate 200 of the present embodiment, and FIG. 9B shows the displacement distribution of the tailgate of the comparative example.

  In the state in which the back door is closed, as indicated by an arrow F in FIG. 8, the reaction force that the damper stay 80 tries to extend is transmitted to the back door.

  Due to the reaction force of the damper stay 80, in the backdoor of the comparative example to which the present invention is not applied, the upper part G1 and the lower part G2 are bent as shown by the line G in the left graph of FIG. Thus, the back door is deformed in a convex shape toward the rear side of the vehicle. In other words, a so-called “two-stage fold” that bends at the upper part G1 and the lower part G2 occurs remarkably.

  In this example, the upper bent portion, that is, the upper portion G1, is a portion corresponding to the damper stay mounting portions 112R and 112L provided with the back door hinges 50R and 50L (see FIG. 2), and the lower bent portion. That is, the lower part G2 is a part corresponding to the vehicle vertical direction intermediate part of the window frame part 150 (slightly above the curved parts 159R, 159L).

  On the other hand, in the back door 100 to which the present invention is applied, the door hinge reinforcement 160 and the intermediate reinforcement 170 are provided, and the lower end portion 162 of the door hinge reinforcement 160 and the upper end portion 176 of the vertical portion 172 of the intermediate reinforcement 170 are provided. The joint T (see also FIG. 4) is configured to be located between the upper part G1 and the lower part G2. Therefore, as shown by the line F in the left graph of FIG. 8, the so-called “two-stage folding” that is bent at the upper part G1 and the lower part G2 is substantially eliminated, and the deformation of the back door 100 is suppressed.

  In addition, if the lower end part 162 of the door hinge reinforcement 160 and the upper end part 176 of the intermediate reinforcement 170 are wrapped, and the door hinge reinforcement 160 and the intermediate reinforcement 170 are integrated, rigidity will improve. However, the configuration in which the lower end 162 of the door hinge reinforcement 160 and the upper end 176 of the intermediate reinforcement 170 are integrated by wrapping may make it difficult to adjust the installation of the back door hinges 50R and 50L.

  Therefore, in this embodiment, as described above, the joint T (see also FIG. 4) between the lower end 162 of the door hinge reinforcement 160 and the upper end 176 of the intermediate reinforcement 170 is between the upper part G1 and the lower part G2. By arranging so that the lower end 162 and the upper end 176 are not wrapped (without integrating the door hinge reinforcement 160 and the intermediate reinforcement 170), the two-stage folding is substantially eliminated and the back door 100 is disposed. The deformation is suppressed. Therefore, it is easy to adjust the installation of the back door hinges 50R and 50L as compared with the configuration integrated by wrapping. That is, the deformation of the back door 100 is suppressed while suppressing the adjustment of the installation. Moreover, the weight of a wrap part can be reduced rather than the structure which edge parts wrapped.

  In addition, the structure which opens and closes the back door opening part 12 with the two doors of the back door 100 and the tailgate 200 like this embodiment makes installation adjustment complicated rather than the structure which opens and closes only with a back door. As a result, installation adjustment may become more difficult. Therefore, it is preferable that the present invention is applied and reinforced to the structure in which the back door opening 12 is opened and closed by the two doors of the back door 100 and the tailgate 200 as in the present embodiment.

  Further, in the present embodiment, the intermediate reinforcement 170 includes the lateral portion 174 that extends toward the vehicle width direction along the lower side portion 156 of the window frame portion 150 on the lower side in the vehicle vertical direction. The rigidity of 150 is improved, and as a result, the deformation of the back door 100 is further suppressed (see each graph in FIG. 8).

  As shown in FIGS. 6A and 6B, the side stopper 300 of the back door 100 contacts the side cushion 320 on the body side, so that the back door 100 is prevented from flapping in the closed state. Further, the side cushion 320 has a wide groove portion 322 and a narrow convex rib portion 324, and the side stopper 300 is configured to contact the rib portion 324. Therefore, the reaction force is reduced as compared with the side cushion 321 as a comparative example configured by the narrow groove portion 323 and the wide convex rib portion 325 shown in FIG. Therefore, the deformation of the back door 100 is further suppressed (see each graph in FIG. 8).

  As shown in FIG. 7, in the tailgate 200 of this embodiment, reinforcing brackets 220R and 220L are joined to the tailgate panels 202 and 204 and the side panels 206R and 206L. Further, the gaps NR and NL are closed by joining the reinforcing brackets 220R and 220L.

  Therefore, as can be seen by comparing FIG. 9A and FIG. 9B, the tailgate 200 of the present embodiment of FIG. 9A is more tailored than the tailgate of the comparative example of FIG. It can be seen that the deformation ratio is smaller than (none). If the deformation ratio of the tailgate of the comparative example of (B) is 1.00, the displacement ratio of the tailgate 200 of this embodiment of (A) is 0.161. In other words, the rigidity of the tailgate 200 (FIG. 9A) of the present embodiment joined by the reinforcing bracket 220 is improved compared to the tailgate of the comparative example (FIG. 9B). .

  And as G3 shown to the left graph of FIG. 8, the lower end part of the back door of a comparative example has shifted | deviated to the vehicle front side. In other words, the amount of lock retraction is large. The back door is deformed due to a large positional shift (retraction amount) at the lower end of the back door.

  On the other hand, as described above, the lower end portion 100B of the back door 100 coupled to the tailgate 200 of the present embodiment in which the reinforcing bracket 220 is provided and the rigidity is improved is as shown by F3 in the left graph of FIG. Misalignment is suppressed. In other words, the amount of lock retraction is decreasing. Then, as a result of the displacement being suppressed (result of a reduction in the amount of lock retracted), deformation of the back door 100 is suppressed.

  Furthermore, the lock reinforcement 140 of this embodiment is larger than the conventional size. Therefore, the rigidity of the lower end portion 100B of the back door 100 is improved, the positional deviation is further suppressed, and the deformation of the back door 100 is further suppressed.

  Further, as shown in FIG. 7B, by joining the reinforcing brackets 220R and 220L, the gaps NR and NL are closed, so that parts such as screws may fall into the gaps NR and NL in the assembly process. Is prevented.

<Others>
The present invention is not limited to the above embodiment.

  For example, in the above embodiment, the upper portion G1 where the vehicle back door is to be deformed by the reaction force of the damper stay corresponds to the damper stay mounting portions 112R and 112L provided with the damper stays 80R and 80L (see FIG. 2). The lower part G2 in which the vehicle back door is to be deformed by the reaction force of the damper stay is the central part of the window frame part 150 in the vehicle vertical direction, but is not limited thereto.

  The upper part G1 and the lower part G1 are appropriately set according to the shape of the back door, the mounting position of the damper stay, the shape of the window frame part, and the like. And what is necessary is just to comprise so that the joint T may be arrange | positioned between the upper side site | part G1 and the lower side site | part G. FIG.

  Moreover, in the said embodiment, although it was the structure which opens and closes the back door opening part 12 with the two doors of the back door 100 and the tailgate 200, it is not limited to this. The structure which opens and closes a back door opening part only by a flip-up type back door may be sufficient.

  Moreover, it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from the summary of this invention.

10 Vehicle 12 Back door opening 50R Back door hinge (door hinge)
50L Back door hinge (door hinge)
80R damper stay 80L damper stay 100 Back door (vehicle back door)
112R damper stay mounting portion 112L damper stay mounting portion 150 window frame portion 152R side side portion 152L side side portion 154 upper side portion 156 lower side portion 160R door hinge reinforcement (first reinforcing member)
160L door hinge reinforcement (first reinforcing member)
162R Lower end portion 162L Lower end portion 170R Intermediate reinforcement (second reinforcing member)
170L intermediate reinforcement (second reinforcing member)
172R Vertical portion 172L Vertical portion 174R Horizontal portion 174L Horizontal portion 176R Upper end portion 176L Upper end portion 200 Tailgate (vehicle tailgate)
202 Tailgate panel 204 Tailgate panel 206R Side panel 206L Side panel 220R Reinforcement bracket 220L Reinforcement bracket G1 Upper part G2 Lower part
T joint

Claims (4)

A vehicle back door reinforcement structure for opening and closing a back door opening at the rear end of the vehicle,
A door hinge provided at an upper end portion of the vehicle back door and joined to an upper end portion of a body configuring around the back door opening;
A window frame portion provided on the vehicle vertical direction lower side of the door hinge in the vehicle back door;
A damper stay, one end of which is rotatably attached to the vehicle back door, and the other end of which is rotatably attached to the body constituting the periphery of the back door opening;
From the part where the door hinge is provided, along the side part of the window frame part on the outer side in the vehicle width direction, the vehicle back door is lower in the vehicle vertical direction than the upper part where the back door for the vehicle is deformed by the reaction force of the damper stay. A first reinforcing member provided on the vehicle back door so that the lower end is located on the side;
The vehicle back door is deformed by the reaction force of the damper stay from the vehicle frame vertical lower side of the window frame portion along the lateral side of the window frame portion in the vehicle width direction. A second reinforcing member provided on the back door for the vehicle so that an upper end portion is positioned above and in the vicinity of a lower end portion of the first reinforcing member;
A vehicle back door reinforcing structure comprising: A vehicle back door reinforcement structure for opening and closing a back door opening at the rear end of the vehicle,
A door hinge provided at an upper end portion of the vehicle back door and joined to an upper end portion of a body configuring around the back door opening;
A window frame portion provided on the vehicle vertical direction lower side of the door hinge in the vehicle back door;
One end portion is rotatably attached to an upper side portion of the vehicle back door at the upper side in the vehicle vertical direction of the window frame portion, and the other end portion is rotatably attached to the body constituting the periphery of the back door opening. Damper stay,
A lower end portion is positioned on the lower side in the vehicle vertical direction from the attachment portion of the one end portion of the damper stay along the side portion on the vehicle width direction outer side of the window frame portion from the portion where the door hinge is provided. A first reinforcing member provided on the vehicle back door;
From the vehicle vertical direction lower side of the window frame part to the vehicle width direction outer side side part of the window frame part, the upper side of the window frame part in the vehicle vertical direction and the first reinforcing member A second reinforcing member provided on the back door for the vehicle so that the upper end portion is positioned in the vicinity of the lower end portion;
A vehicle back door reinforcing structure comprising: The second reinforcing member is
A vertical part formed along the side part from the vehicle vertical direction lower side of the window frame part,
A lateral portion extending from the vertical portion toward the vehicle width direction inside along the lower side portion of the window frame portion on the vehicle vertical direction lower side;
The reinforcement structure of the back door for vehicles of Claim 1 or Claim 2 provided with these. The vehicle tail which is provided in the vehicle up-down direction lower side of the said back door opening part, and the lower end part of the vehicle back door of any one of Claims 1-3 of a closed state is couple | bonded with an upper end part A reinforcing structure of the gate,
The vehicle tailgate is
A tailgate panel constituting both sides of the vehicle tailgate in the vehicle longitudinal direction; and
Side panels constituting both sides of the vehicle tailgate in the vehicle width direction;
Have
Reinforcing brackets are provided on both outer sides in the vehicle width direction at the upper end of the vehicle tailgate, and the reinforcing bracket is joined to the tailgate panel and the side panel.
Reinforcement structure for vehicle tailgates.

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