JP4757164B2 - Support structure for vehicle back door - Google Patents

Description

  The present invention relates to a vehicular back door support structure in which a side-opening back door is supported by a pillar member forming a back door opening of a vehicle body via a pair of upper and lower door hinges.

  In an automobile equipped with a laterally opening type back door, the support rigidity and strength of the pillar member that supports the back door are increased. For example, in Patent Document 1, as shown in FIG. 9, a thick plate extending in the vertical direction along the outer member 51a is disposed between the outer member 51a and the inner member 51b of the pillar member 51 that forms the door opening. The rein hose 52 is disposed, and the door hinge 53 is brought into contact with the rein hose 52 together with the outer member 51a to be bolted and fixed.

Further, the pillar member 51 is formed by superposing the lower edge portion 51c of the inner member 51b and the lower edge portion 52a of the rein hose 52 on a flange portion 54a of an underbody member 54 such as a floor member or a wheel house member. It is configured by joining the overlapping portions from the front and rear by spot welding. In this case, spot welding is performed through the work hole 51d formed in the outer member 51a, and then the work hole 51d is closed with the plug 55.
Japanese Patent Laid-Open No. 10-244966

  By the way, in the above-mentioned conventional structure, the door hinge is brought into contact with the rein hose together with the outer member, and is bolted and fixed. Therefore, the rigidity against deformation caused by the bending load in the front-rear direction acting on the pillar member at the time of opening and closing the back door is sufficient. There is concern that it cannot be secured.

  Further, as in the conventional structure, when spot welding is performed on the overlapping portion through the work hole formed in the outer member, as shown in FIG. 9, there is a plug 55 that closes the work hole 51d. Inevitably, it is necessary to dispose the door hinge 53 above the plug 55, and therefore, there is a problem that the upper and lower hinge pitches cannot be sufficiently secured. In addition, there is a problem that the cost is increased by the amount required for the plug for closing the working hole.

  The present invention has been made in view of the above-described conventional situation, and can sufficiently secure the back door support rigidity of the pillar member, can sufficiently secure the hinge pitch, and eliminates the need for a plug, thereby reducing the cost. It is an object to provide a back door support structure.

  In the present invention, a back door opening formed at the rear end of a vehicle body is formed by a pillar member formed by joining an outer member and an inner member so as to form a closed cross section, and a pair of upper and lower portions are formed by the pillar member. A vehicle back door support structure that supports a laterally openable back door through a door hinge so as to be openable and closable, wherein a bulkhead is disposed at least in a portion facing the lower door hinge in the pillar member. Includes at least first and second coupling portions that contact the outer member, first and second vertical walls extending from the first and second coupling portions toward the inner member, and the first and second vertical portions. A third coupling portion that connects the walls and abuts against the inner member, and the third coupling portion is formed on the outer member through a work hole formed to face the third coupling portion. Underbody part with inner member Coupled to, door hinge of the lower side is arranged so as to cover the said working hole in the outer member, the first with the outer member is characterized by being coupled to the second coupling portion.

  According to the support structure for a vehicle back door according to the present invention, the bulkhead is disposed at a portion facing the lower door hinge in the pillar member, and the bulkhead is connected to the outer member by the first and second coupling portions. The first and second vertical walls extending from the first and second coupling portions toward the inner member, and the third coupling portion connecting the first and second vertical walls and contacting the inner member. Therefore, the rigidity against deformation due to the bending load acting in the front-rear direction acting on the pillar member can be increased, and the rigidity against deformation due to torsional load acting on the back door opening can be increased. As a result, the support rigidity and strength of the back door can be improved.

  In the present invention, the lower door hinge is disposed so as to cover the working hole of the outer member, and is coupled to the first and second coupling portions together with the outer member. , The lower hinge pitch can be sufficiently secured, the conventional plug can be made unnecessary, and the cost can be reduced while preventing the water from entering from the working hole.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 to FIG. 8 are views for explaining a support structure for a vehicle back door according to an embodiment of the present invention. FIG. 1 is a perspective view of a vehicle body in which a laterally open back door is provided. 2 is a rear view of the pillar member forming the back door opening, FIG. 3 is a sectional view taken along line III-III in FIG. 2, FIG. 4 is a sectional view taken along line IV-IV in FIG. 2, and FIG. 6 is a sectional view taken along line VI-VI in FIG. 2, FIG. 7 is a rear view of the bulkhead, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. Note that front and rear and left and right in this embodiment mean front and rear and left and right when viewed in a seated state.

  In the figure, reference numeral 1 denotes a vehicle body viewed from the rear, and a back door opening 1b is formed in a rear end portion 1a of the vehicle body 1. The back door opening 1b includes left and right pillar members 2 and 3 that form the left and right edges of the back door opening 1b, a roof back 4 that forms an upper edge, and a lower back that forms a lower edge. And 5. The lower back 5 has a structure in which a lower outer 5a and a lower inner 5b are joined by welding so as to form a closed cross section.

  A laterally opening type back door 7 is disposed in the back door opening 1b. In the back door 7, a window opening 8c is formed in the upper half of the door body 8 formed by joining the outer peripheral edges of the door outer panel 8a and the door inner panel 8b, and a window glass 9 is disposed on the window 8c. It has a structure.

  The back door 7 is supported by the right pillar member 3 so as to be opened and closed in the left-right direction via a pair of upper and lower upper and lower door hinges 10 and 11. A door handle 8d for releasing the lock with a lock mechanism (not shown) disposed on the left pillar member 2 is disposed on the opposite side of the back door 7 from the door hinges 10 and 11.

  The upper and lower door hinges 10, 11 are hinge pins that connect the pillar side hinge members 10 a, 11 a fixed to the pillar member 3 and the door side hinge members 10 b, 11 b fixed to the door inner panel 8 b of the back door 7. It has the structure connected so that rotation was possible by 10c, 11c (refer FIG. 4, FIG. 5).

  The upper door hinge 10 is disposed at a position facing the lower edge of the window opening 8 c of the door body 8, and the lower door hinge 11 is disposed at a position close to the lower edge of the door body 8. In other words, the upper door hinge 10 is disposed at the center in the vertical direction of the pillar member 3, and the lower door hinge 11 is disposed so as to overlap the upper edge of the lower back 5 in the vehicle width direction.

  The right pillar member 3 is formed in a generally rectangular tube shape in which the outer member 3 a and the inner member 3 b are welded to form a closed cross section, and the lower end portion of the pillar member 3 is welded to the lower back 5. ing. Although not shown, the left pillar member 2 has a structure substantially similar to that of the right pillar member 3.

  The lower edge 3 h of the outer member 3 a is welded to the lower outer 5 a of the lower back 5. The lower end 3f of the inner member 3b extends obliquely downward and rearward so as to form a generally square shape. The lower edge 3g of the inner member 3b is joined to the lower outer 5a and the lower inner 5b of the lower back 5. The upper flange portion 5c is overlapped and welded. Thereby, the lower end part of the pillar member 3 is obstruct | occluded (refer FIG. 3).

  Upper and lower door hinge mounting seats 3c and 3d are formed on the outer member 3a, and a door checker mounting seat 3e is formed between the mounting seats 3c and 3d.

  A door checker 13 for restricting the opening degree of the back door 7 via a reinforcing member 12 is bolted to the door checker mounting seat 3e (see FIGS. 2 and 6).

  A pillar-side hinge member 10a of the upper door hinge 10 is fixed to the upper door hinge mounting seat 3c by three bolts 16 via a hinge bracket 15 having a substantially hat shape in a longitudinal sectional view.

  The hinge bracket 15 includes a flat plate portion 15a that contacts the inner surface of the outer member 3a, upper and lower leg portions 15b and 15b extending from the upper and lower edges of the flat plate portion 15a toward the inner member 3b, and the upper and lower legs. It has flange portions 15c and 15c which are bent and extended outward from the portion 15b and welded to the inner member 3b (see FIGS. 2 and 5).

  A bulkhead 20 made of sheet metal is disposed at a portion facing the lower hinge mounting seat 3 d in the pillar member 3.

  The bulkhead 20 is in contact with the lower hinge mounting seat 3d of the outer member 3a, and is connected to the lower pair of first and second coupling portions 20a and 20b and the lower edge of the first coupling portion 20a. A first vertical wall 20c extending toward the member 3b, a second vertical wall 20d extending toward the inner member 3b following the upper edge of the second coupling portion 20b, and the first and second vertical walls 20c, 20d And a third coupling portion 20e that couples them together, and the third coupling portion 20e is in contact with the inner member 3b.

  The bulkhead 20 has a third vertical wall 20f extending toward the inner member 3b following the upper edge of the first coupling portion 20a, and a bend formed following the front edge of the third vertical wall 20f. And a fourth coupling portion 20g that contacts the member 3b. The fourth coupling portion 20g is joined to the inner member 3b by spot welding.

  Further, the bulkhead 20 has a fifth connecting portion 20h extending downward following the lower edge of the second connecting portion 20b, and the fifth connecting portion 20h is a lower edge portion 3h of the outer member 3a. At the same time, it is overlapped on the lower outer 5a and joined by spot welding.

  A rear suspension bracket (underbody member) 22 is disposed on the front side of the inner member 3b. The bracket 22 has a bracket body 22b in which an insertion hole 22a for supporting a rear suspension (not shown) is formed, and a flange portion 22c that is bent upward at the rear end edge of the bracket body 22b. . The flange portion 22c is in contact with the inner member 3b so as to face the third coupling portion 20e.

  The third coupling portion 20e is rearward together with the inner member 3b by a spot gun (not shown) inserted into the outer member 3a through a work hole 3a 'formed so as to face the third coupling portion 20e. The suspension bracket 22 is joined to the flange portion 22c by spot welding.

  The pillar-side hinge member 11a of the lower door hinge 11 is disposed on the outer member 3a so as to cover the working hole 3a ', and the first and second couplings of the bulkhead 20 together with the outer member 3a. It is connected to the parts 20a, 20b.

  Specifically, a pair of left and right nuts 23, 23 are fixed to the first coupling portion 20a, and one nut 23 is fixed to the left end portion of the second coupling portion 20b. The lower door hinge 11 is fastened and fixed to the pillar member 3 so as to close the work hole 3a 'in a substantially airtight manner by tightening the three bolts 24 inserted from the rear of the vehicle to the nuts 23. Here, a sealer member that fills the gap between the outer member 3a and the outer peripheral edge of the pillar-side hinge member 11a may be applied. In this case, it is possible to more reliably prevent water from entering the pillar member 3.

  As a result, when viewed in a longitudinal section, the lower hinge mounting seat 3d of the pillar member 3 is an approximate letter having three closed sections a, b, c by the bulkhead 20, the outer member 3a and the inner member 3b. It has a shape (see FIG. 3).

  According to the present embodiment, the bulkhead 20 is disposed at a portion facing the lower door hinge 11 in the pillar member 3 that supports the laterally opening back door 7, and the bulkhead 20 is in contact with the outer member 3a. , Second coupling parts 20a, 20b, first and second vertical walls 20c, 20d extending to the inner member 3b following the first and second coupling parts 20a, 20b, the first and second vertical parts. Since the walls 20c and 20d are connected to each other and the third connecting portion 20e is in contact with the inner member 3b, the rigidity against deformation caused by a bending load in the front-rear direction acting on the pillar member 3 can be increased. The support rigidity and strength of the back door 7 can be improved.

  In the present embodiment, the bulkhead 20 is formed by bending the third vertical wall 20f extending to the inner member 3b side following the upper edge of the first coupling portion 20a and the front edge of the third vertical wall 20f. In addition, since the fourth coupling portion 20g coupled to the inner member 3b is provided, the bending rigidity of the pillar member 3 can be further increased.

  Further, the bulkhead 20 is formed with a fifth coupling portion 20h extending downward following the lower edge of the second coupling portion 20b, and the fifth coupling portion 20h together with the lower edge portion 3h of the outer member 3a is formed on the lower outer 5a. Since they are bonded together, the bonding strength of the bulkhead 20 can be increased.

  In the above-described embodiment, the case where the fifth coupling portion 20h extending downward is formed in the second coupling portion 20b of the bulkhead 20 is described. However, as shown by the two-dot chain line in FIG. The fourth vertical wall 20i extending to the inner member 3b is formed following the lower edge of the two coupling portions 20b, and the fifth coupling portion 20j coupled to the inner member 3b is bent and formed on the fourth vertical wall 20i. Good. In this case, the bending rigidity of the pillar member 3 can be further increased.

  In the present embodiment, the lower door hinge 11 is arranged on the outer member 3a so as to cover the working hole 3a ', and the bolt 24 is attached to the first and second coupling portions 20a and 20b of the bulkhead 20 together with the outer member 3a. Thus, the attachment strength of the lower door hinge 11 can be increased, the conventional plug can be made unnecessary, and the cost of components can be reduced while preventing water from entering from the work hole 3a ′.

  In the present embodiment, since the lower door hinge 11 is arranged so as to close the work hole 3a ′, the lower door hinge 11 can be arranged at a lower position than the conventional arrangement position. Thereby, the space | interval of the upper door hinge 10 and the lower door hinge 11 can be enlarged, the weight burden of the back door 7 can be reduced, and support rigidity can be improved. That is, since the window opening of the back door 7 has low rigidity, the upper door hinge 10 is inevitably attached to the door body 8, and the arrangement position thereof is determined. For this reason, in the conventional structure, it is necessary to arrange the lower door hinge so as to avoid the work hole, and there is a problem that a sufficient distance between the upper and lower door hinges cannot be secured. On the other hand, in this embodiment, it becomes possible to arrange | position the lower door hinge 11 in the position close | similar to the lower edge of the door main body 8, As a result, the said space | interval can fully be ensured.

  In the above embodiment, the case where the rear suspension bracket is used as the underbody member has been described as an example. However, the underbody member of the present invention includes the case of a floor member or a rear wheel house member.

1 is a perspective view of a vehicle body of an automobile provided with a laterally opening back door according to an embodiment of the present invention. It is a rear view of the pillar member which supports the said back door. It is sectional drawing (III-III sectional view taken on the line of FIG. 2) of the said pillar member. It is sectional drawing (IV-IV sectional view taken on the line of FIG. 2) of the said pillar member. It is sectional drawing (VV sectional view taken on the line of FIG. 2) of the said pillar member. It is sectional drawing (VI-VI sectional view taken on the line of FIG. 2) of the said pillar member. It is a rear view of the bulkhead arrange | positioned at the said pillar member. It is sectional drawing (the VIII-VIII sectional view taken on the line of FIG. 7) of the said bulkhead. It is sectional drawing which shows the support structure of the conventional general back door.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body 1a Rear end 1b Back door opening 3 Pillar member 3a Outer member 3a 'Working hole 3b Inner member 7 Back door 10 Upper door hinge 11 Lower door hinge 20 Bulkhead 20a First coupling portion 20b Second coupling portion 20c First 1 vertical wall 20d second vertical wall 20e third coupling portion 22 rear suspension bracket (underbody member)

Claims (1)

A back door opening formed at the rear end of the vehicle body is formed by a pillar member formed by joining an outer member and an inner member so as to form a closed cross section, and the pillar member is used to pass through a pair of upper and lower door hinges. A support structure for a vehicle back door that supports a laterally openable back door so that the door can be opened and closed.
A bulkhead is disposed in a part facing at least the lower door hinge in the pillar member,
The bulkhead includes at least first and second coupling portions that contact the outer member, first and second vertical walls extending from the first and second coupling portions toward the inner member, Connecting the second vertical walls to each other, and having a third coupling portion that contacts the inner member,
The third coupling portion is coupled to the underbody member together with the inner member through a work hole formed in the outer member so as to face the third coupling portion.
The lower door hinge is disposed on the outer member so as to cover the working hole, and is coupled to the first and second coupling portions together with the outer member. .

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