JP2014151816A - Vehicle back door reinforcing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality by suppressing the shaking of a license plate part when opening a back door, and to suppress KOMORI or fluttering sound.SOLUTION: A back door is attached through a door hinge 2. A through-hole 12 is provided at a center portion of an inner panel 11. A plane portion on which a license plate is installed is provided on an outer panel. At upper and lower positions on the plane portion, an attaching portion and a supporting portion are provided. Between the inner panel 11 and an outer panel, an inner reinforcement 4 for reinforcing a panel part corresponding to an installation place of the license plate is provided. First joint portions B1 and B2 between the outer panel and the reinforcement 4 are arranged on the plane portion within a range surrounded by the attaching portion and the supporting portion. A second joint portions A1 between the inner panel 11 and the reinforcement is positioned on an upper side part of the through-hole 12, and arranged between direction lines D1 and D2 connecting the first joint portions B1, B2 and the door hinge 2.

Description

  The present invention relates to a back door reinforcing structure that reinforces a back door of a hatchback vehicle of a type in which a back door that opens and closes an opening at a rear portion of a vehicle body is rotatably attached to the rear portion of the vehicle body via a door hinge.

  Conventionally, a back door of a hatchback vehicle is rotatably attached to an upper portion or a side portion of a rear portion of a vehicle body via a door hinge in order to open and close an opening portion of the rear portion of the vehicle body. Such a back door is constituted by an inner panel and an outer panel. A relatively large through-hole is provided in the central portion of the inner panel as a punch hole for reducing the weight or as a work hole used for installation and maintenance of the license lamp and the back door handle. Further, the outer panel is provided with a flat portion for installing the license plate, and the license plate is attached to and supported at the vertical and horizontal positions of the flat portion.

As described above, when the license plate is attached to the outer panel constituting the back door, the license plate installation portion depends only on the surface rigidity of the outer panel, so that the rigidity is insufficient. For this reason, when the back door is closed, when the back door tip located at a position away from the door hinge at the center of rotation hits the bottom or side rubber stopper of the door opening and stops, a larger load is applied to the back door tip. The central part which is working and is far from the outer peripheral part is greatly deflected, and the license plate part installed in the area is shaken, which may give an impression of inexpensive appearance quality. In addition, chatter noise may occur due to the license plate portion hitting peripheral parts such as the outer panel.
Further, since the license plate portion continues to shake due to insufficient rigidity of the license plate installation portion, stress concentration may occur in the corner portion of the panel assembly, and cracks may occur. Furthermore, if the license plate portion is shaken due to vertical vibration or the like based on the size of the road surface unevenness while the vehicle is running, there is a risk of causing a muffled noise in the passenger compartment or a backdoor fluttering sound. In addition, the air column vibration that resonates with the longitudinal length of the passenger compartment causes the back door to vibrate in the longitudinal direction of the vehicle. There was a problem that indoor noise was generated.

  Therefore, some conventional hatchback vehicles have a structure in which reinforcement is provided between the inner panel and the outer panel to increase the surface rigidity (see, for example, Patent Document 1). There is a structure in which a surface reinforcement is improved by attaching a sealer after attaching a body reinforcement (for example, see Patent Document 2).

JP 2003-182039 A JP 2009-166540 A

  However, in the conventional back door reinforcement structure described above, reinforcement is not provided corresponding to the position of the license plate installation portion, and the rigidity of the portion corresponding to the license plate installation portion of the inner panel is increased. As a result, it was not enough to prevent the license plate from shaking, the corners of the panel assembly cracking, and the like, and the noise of the interior of the passenger compartment and the backdoor fluttering. . In order to increase the rigidity of the license plate installation portion, it is necessary not only to join the reinforcement to the inner panel and the outer panel but also to improve the rigidity of attachment of the reinforcement to the panel.

Furthermore, in the conventional reinforcement structure in which the sealer and the like are bonded after attaching the reinforcement to the inner panel, the sealer itself used for bonding is soft, so the inner panel and the outer panel are caused by the vertical vibration of the back door when the vehicle is running. Therefore, there is a problem in that it is not possible to reduce the amount of displacement that shifts up and down, and it is impossible to suppress shaking of the license plate portion. Further, if the license plate portion is restrained from shaking by being firmly fixed with a sealer or the like, stress concentrates on the fixing portion, which may cause cracks in the inner panel.
On the other hand, in order to reduce the shaking of the license plate, etc., a method of suppressing the vertical vibration of the back door by attaching a weight or the like to the back door has been proposed, but this method increases the weight and the cost. Had the problem of inviting.

  The present invention has been made in view of such a situation, and its purpose is to increase the rigidity of the entire back door by joining the inner reinforcement to the inner panel and the outer panel without attaching a weight or the like to the back door. The back of the vehicle, which can improve the texture by suppressing the shaking of the license plate part when the back door is closed, can suppress the muffled sound in the passenger compartment and the back door fluttering sound, and reduce the weight and cost The object is to provide a door reinforcement structure.

  In order to solve the above-described problems of the prior art, according to the present invention, a back door that opens and closes an opening of a rear portion of a vehicle body is rotatably attached to the rear portion of the vehicle body via a pair of door hinges. And a central portion of the inner panel is provided with a through hole, and the outer panel is provided with a flat portion for installing a license plate, and the upper and lower positions of the flat portion are In the vehicle back door reinforcement structure in which the license plate mounting portion and the support portion are provided, the inner panel and the outer panel corresponding to the installation location of the license plate are disposed between the inner panel and the outer panel. An inner reinforcement is provided to reinforce the portion, and the outer panel and the inner line are provided. A first joint portion with a reinforcement is disposed on the flat surface portion within a range surrounded by the mounting portion and the support portion for the license plate, and a second joint portion between the inner panel and the inner reinforcement. The portion is located on a side portion surrounding the through hole, and is disposed between the direction lines connecting the first joint portion and the door hinge.

  In the present invention, the second joint is provided on at least three sides of one side of the side surrounding the through hole and the sides on both sides thereof.

  Further, in the present invention, the license plate is installed on a far half side of the back door that is located away from the door hinge, and is located at a central side portion of the three sides surrounding the through hole. The inner reinforcement between the second joint and the first joint is formed in a substantially Z-shaped cross section when viewed from the side of the vehicle, and is an upper portion of the inner reinforcement having the substantially Z-shaped cross section. Are joined to the inner panel and joined to the outer panel at a lower portion of the inner reinforcement having the substantially Z-shaped cross section, and the upper and lower intermediate portions of the inner reinforcement having the substantially Z-shaped cross section are The vehicle extends diagonally rearward so as to be positioned away from the door hinge.

  Furthermore, in this invention, the said 1st junction part is arrange | positioned in the area | region enclosed by the said 2nd junction part located in the said 3 side part of the said through hole by vehicle rear view.

  As described above, in the vehicle back door reinforcement structure according to the present invention, the back door that opens and closes the opening at the rear of the vehicle body is pivotally attached to the rear of the vehicle body via the pair of door hinges, and the back door includes an inner panel. And a central portion of the inner panel is provided with a through hole, and the outer panel is provided with a flat portion for installing a license plate, and the upper and lower positions of the flat portion are An attachment portion and a support portion for the license plate are provided, and the inner panel and the outer panel corresponding to the installation location of the license plate are reinforced between the inner panel and the outer panel. An inner reinforcement is provided, and a first of the outer panel and the inner reinforcement is provided. A joint portion is disposed in the flat surface portion within a range surrounded by the mounting portion for the license plate and the support portion, and a second joint portion between the inner panel and the inner reinforcement is formed through the through-hole. It is located in the side part surrounding a hole, and is arrange | positioned between the direction lines which connect each of the said 1st junction part and the said door hinge.

That is, in the back door reinforcing structure of the present invention, the first joint portion between the outer panel and the inner reinforcement is surrounded by the mounting portion and the support portion for the license plate. When it is received by the mounting portion and the support portion for the plate, the inner reinforcement can receive a load on the back door from the rear of the vehicle through the first joint portion. Further, the second joint portion between the inner panel and the inner reinforcement is a side portion surrounding the through hole of the inner panel, and is disposed between the direction lines connecting the first joint portion and the door hinge. Therefore, the direction corresponding to the load from the rear of the vehicle to the inner reinforcement is along the direction of closing the back door, and the load can be received straight without being deflected.
Therefore, according to the back door reinforcing structure of the present invention, the rigidity of the entire back door is increased by joining the inner reinforcement to the inner panel and the outer panel, and the texture of the license plate portion when the back door is closed is suppressed. It is possible to improve and give a high-class feeling, and it is possible to suppress a loud sound in the passenger compartment and a backlash sound of the back door, thereby realizing a comfortable vehicle traveling. Moreover, according to the back door reinforcing structure of the present invention, it is not necessary to attach a weight or the like to the back door, so that the weight and cost can be reduced.

  Further, in the back door reinforcing structure of the present invention, the second joint portion is provided on at least three sides of one side of the side surrounding the through hole and the sides on both sides thereof, so that the through hole It is possible to improve the partial rigidity of the peripheral portion of the steel plate, and by joining the inner reinforcement on which the base is formed to the outer panel at the first joint portion, it is possible to reliably receive the load from the license plate. Therefore, according to the back door reinforcing structure of the present invention, the above-described problems of the prior art can be more effectively improved.

  Furthermore, in the back door reinforcing structure of the present invention, the license plate is installed on the far half side of the back door that is located away from the door hinge, and the middle of the three sides surrounding the through hole. The inner reinforcement between the second joint portion and the first joint portion located on a side portion is formed in a substantially Z-shaped cross section when viewed from the side of the vehicle, and the inner section in the substantially Z-shaped cross section. The upper portion of the inner reinforcement, which is joined to the inner panel at the upper part of the reinforcement and joined to the outer panel at the lower part of the inner reinforcement having the substantially Z-shaped cross section, Since the intermediate portion extends obliquely rearward of the vehicle so as to be located away from the door hinge, the inner reinforcement has a substantially Z-shaped cross section. With portions can serve a cushion against the load or the vehicle vertical direction of the load from behind the vehicle, it is possible to improve the moldability of the inner reinforcements itself. Moreover, the load from the rear of the vehicle to the inner reinforcement can be received straight.

  Although it is necessary for the inner reinforcement to receive and support the load from the rear of the vehicle, if the inner reinforcement is firmly fixed to the outer panel or the like, the inner reinforcement will bend the entire outer panel. This is because stress is concentrated on the side portion of the through hole to which the first joint portion, the second joint portion, and the inner reinforcement are attached. Further, if the inner reinforcement suppresses the flat portion for the license plate too much, the distortion in the peripheral portion of the depression for the license plate becomes large, which causes a crack.

  And in the back door reinforcement structure of this invention, since the said 1st junction part is arrange | positioned in the area | region enclosed by the said 2nd junction part located in the said 3 side part of the said through hole by vehicle rear view. The load from the first joint can be evenly distributed in each of the second joints without tilting, and stress can be prevented from concentrating on one joint.

1 is a back door of a vehicle to which a reinforcing structure according to an embodiment of the present invention is applied, and is a perspective view of a state before a license plate is attached to an outer panel as viewed from the rear of the vehicle. It is a perspective view which shows the state before joining the inner reinforcement provided in the back door reinforcement structure which concerns on embodiment of this invention to an inner panel and an outer panel. It is a perspective view which shows the state which joined the inner reinforcement provided in the back door reinforcement structure which concerns on embodiment of this invention to the inner panel. It is a front view which shows the inner reinforcement provided in the back door reinforcement structure which concerns on embodiment of this invention. FIG. 5 is a cross-sectional view taken along line CC in FIG. 4, showing a state in which the inner reinforcement according to the embodiment of the present invention is joined to the inner panel and the outer panel.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
1 to 5 show a back door reinforcing structure for a vehicle according to an embodiment of the present invention.

  As shown in FIGS. 1 to 3, a vehicle to which a back door reinforcing structure according to an embodiment of the present invention is applied is a type in which a back door 1 that opens and closes a door opening (not shown) at the rear of a vehicle body opens upward. This is a hatchback vehicle. Therefore, the back door 1 is rotatably attached to the rear part of the vehicle body via a pair of left and right door hinges 2 provided at the upper part of the vehicle body, and is configured to rotate around the door hinge 2 when the door opening is opened and closed. Has been. A pair of left and right door hinges 2 that pivotably support the back door 1 are arranged at intervals in the vehicle width direction, and are respectively provided at the rear part of the vehicle body near the left and right corners located above the door opening. ing. A window opening for attaching a window glass (not shown) is provided on the upper portion of the back door 1.

The back door 1 includes an inner panel 11 disposed on the vehicle interior side and an outer panel 21 disposed on the vehicle exterior side, and the peripheral portions of the inner panel 11 and the outer panel 21 are joined to each other. Is formed in a shell shape having a space inside. As shown in FIGS. 2 and 3, a relatively large square is formed in the center of the inner panel 11 as a punch hole for reducing the weight or as a work hole used for installation and maintenance of the license lamp and the back door handle. A shaped through hole 12 is provided.
As shown in FIGS. 1 and 2, the outer panel 21 is provided with a flat portion 22 for installing the license plate 3. The flat portion 22 is a square corresponding to the size of the license plate 3. It has a shape and is formed on the bottom surface of a recess 23 that is recessed toward the vehicle front side. Plate mounting portions 24 for attaching the license plate 3 are provided on the left and right sides in the vehicle width direction at the upper position of the flat portion 22, and the plate support portion 25 for supporting the license plate 3 is provided at the lower position of the flat portion 22. It is provided on both the left and right sides in the vehicle width direction. Therefore, the license plate 3 is attached and supported at the vertical and horizontal positions of the flat surface portion 22 by engaging the upper and lower and right and left portions on the back side with the corresponding plate mounting portion 24 and the plate support portion 25, respectively. It has become.

On the other hand, in the back door reinforcing structure of the present embodiment, the gap S in the vehicle front-rear direction between the inner panel 11 and the outer panel 21 has a predetermined vertical length as shown in FIGS. In addition, an inner reinforcement 4 having a substantially horizontally trapezoidal shape as viewed from the rear of the vehicle having a width in the left-right direction is provided. The inner reinforcement 4 is a panel member that reinforces the inner panel 11 and the outer panel 21 corresponding to the installation location of the license plate 3 when viewed from the rear of the vehicle. The inner reinforcement 4 is used to increase the weight of the license plate. In this structure, the panel rigidity of the portion to which 3 is attached is improved.
Therefore, the inner reinforcement 4 is disposed on the upper side 12a side of the through hole 12 of the inner panel 11 and extends along the vehicle width direction. Further, the inner reinforcement 4 is formed such that the length in the vehicle width direction is larger than the width of the upper side portion 12 a of the through hole 12, and the left side lower end portion 4 c is an arcuate corner at the upper left side of the through hole 12. The right side lower end 4d is arranged so as to extend obliquely downward. Accordingly, the inner reinforcement 4 is provided on the upper side portion 12a surrounding the through hole 12 of the inner panel 11 and the upper portions of the left and right side portions 12b and 12c.

  The inner reinforcement 4 of this embodiment is attached to the inner panel 11 and the outer panel 21 by joining a plurality of predetermined positions by spot welding among the overlapping portions of the inner panel 11 and the outer panel 21. That is, as shown in FIGS. 1 to 5, the two first joint portions B1 and B2, which are the connecting portions of the outer panel 21 and the inner reinforcement 4, are vertically and horizontally positioned to stably attach the license plate 3. Are disposed on the plane portion 22 within the range surrounded by the two plate mounting portions 24 and the plate support portion 25.

Therefore, the first joint portions B1 and B2 are located on the right side on the lower portion 4b side of the inner reinforcement 4 in the inner reinforcement 4, and are disposed with a space in the vehicle width direction. . As a result, the positions of the first joints B1 and B2 are set on the back side of the license plate 3. As shown in FIGS. 1 and 5, the spot dents B of the first joints B1 and B2 are licensed. It is comprised so that it may be hidden behind the plate 3 and an external appearance may not be impaired.
In addition, as shown in FIG. 4, the first joints B <b> 1 and B <b> 2 are regions surrounded by five second joints A <b> 1 to A <b> 5 (described later) located on the three sides of the through hole 12 in the vehicle rear view. Is placed inside. With this arrangement, the load from the first joints B1 and B2 can be evenly distributed in each of the second joints A1 to A5, and the stress can be prevented from concentrating on one joint. It has become.

Of the five second joints A1 to A5 that are the joints between the inner panel 11 and the inner reinforcement 4, the second joint A1 at the upper center position is as shown in FIGS. , Located on the upper side 12a of the side surrounding the through hole 12 of the inner panel 11, and between the direction lines D1, D2 connecting the two first joints B1, B2 and the pair of left and right door hinges 2, respectively. The inner reinforcement 4 is positioned on the upper part 4a. As a result, the direction corresponding to the load from the rear of the vehicle to the inner reinforcement 4 is along the direction in which the back door 1 is closed, and the inner reinforcement 4 receives the load straight without being deflected. Is possible.
Of the five second joints A1 to A5, the second joints A2 and A3 at the upper side positions are located on the left and right sides of the upper part 4a of the inner reinforcement 4, and the second joint part at the center position. They are arranged at intervals in the vehicle width direction with A1 in between. Furthermore, the second joints A4 and A5 at the lower both side positions are located at the lower left and right lower ends 4c and 4d in the lower part 4b of the inner reinforcement 4, and the first joints B1 and B2 at the intermediate positions are interposed therebetween. It is arranged with an interval in the vehicle width direction.
Therefore, 2nd junction part A1-A5 is provided in three sides of the side part surrounding the through-hole 12 of the inner panel 11, at least the upper side part 12a, and the right and left side parts 12b and 12c located in the both sides. Thus, the rigidity of the peripheral portion of the through hole 12 is improved.

By the way, the license plate 3 of this embodiment is installed in the far half side of the back door 1 located away with respect to the door hinge 2, as shown in FIG.1 and FIG.3. Moreover, the inner reinforcement 4 between the second joint portion A1 and the first joint portion B1 located at the upper side portion 12a in the center among the three side portions 12a, 12b, 12c surrounding the through hole 12 of the inner panel 11 is provided. As shown in FIG. 5, the upper side 4 a of the inner reinforcement 4 having a substantially Z-shaped cross section is formed on the surface side of the inner panel 11. Are joined by spot welding. Further, the lower portion 4b of the inner reinforcement 4 having a substantially Z-shaped cross section is joined to the back side of the outer panel 21 at a position corresponding to the flat portion 22 where the license plate 3 is installed by spot welding. Further, the upper and lower middle portion 4e of the inner reinforcement 4 having a substantially Z-shaped cross section extends downwardly and obliquely toward the rear of the vehicle so as to be located away from the door hinge 2, and the inner panel 11 and the outer panel. 21 is not joined to either.
When the inner reinforcement 4 having such a cross-sectional shape is disposed in the gap S between the front and rear of the inner panel 11 and the outer panel 21, and the upper and lower portions 4 a and 4 b are joined to the inner panel 11 and the outer panel 21, A portion having a substantially Z-shaped cross section of the reinforcement 4 serves as a cushion against a load from the rear of the vehicle applied to the outer panel 21 or the like or a load in the vertical direction of the vehicle, and to the inner reinforcement 4. It is also possible to receive a straight load from the rear of the vehicle.

  Next, as one method for obtaining the vehicle back door reinforcing structure according to the embodiment of the present invention, first, as shown in FIG. 2, the upper and lower portions 4 a and 4 b of the inner reinforcement 4 are placed at predetermined positions of the inner panel 11. And the left and right side lower end portions 4c and 4d are overlapped and joined by spot welding to provide second joining portions A1 to A5, and the inner reinforcement 4 is attached to the inner panel 11 to produce an inner assembly. To do. Next, the inner assembly is assembled to the outer panel 21, and the inner reinforcement 4 is superimposed on the back surface of the flat portion 22 of the outer panel 21, and is joined by spot welding to provide the first joint portions B1 and B2. If the outer panel 21 and the inner panel 11 are fixed by the inner reinforcement 4, the back door 1 having a reinforced structure is obtained.

  As described above, in the vehicle back door reinforcing structure according to the embodiment of the present invention, the inner reinforcement 4 having a substantially Z-shaped cross section is arranged in the gap S between the inner panel 11 and the outer panel 21 when viewed from the side of the vehicle. The second joint portions A1 to A5 and the first joint portion are provided in a special arrangement relationship with the upper and lower portions 4a, 4b and the lower left and right side lower end portions 4c, 4d being joined to the inner panel 11 and the outer panel 21. Since B1 and B2 are provided, the overall rigidity of the back door 1 can be increased, and the texture can be improved by suppressing shaking of the license plate 3 and the like when the back door 1 is closed. It is possible to efficiently suppress the squeaking noise in the passenger compartment and the backdoor fluttering sound. Moreover, in the back door reinforcing structure of the present invention, the inner reinforcement 4 is joined to the inner reinforcement 4 by increasing the overall shape of the inner reinforcement 4, increasing the plate thickness, adding a bead, or the like. Since the rigidity of the inner panel 11 and the outer panel 21 can be improved, the thickness of the inner panel 11 and the outer panel 21 can be reduced. Moreover, since it is not necessary to attach a weight etc. to the back door 1, weight and cost can be reduced.

  While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

For example, the reinforcing structure of the above-described embodiment is applied to the back door 1 of the type that opens upward via a pair of left and right door hinges 2 provided at the upper part of the rear part of the vehicle body. The present invention may be applied to a back door that opens to the side via a pair of upper and lower door hinges. Also in this case, the license plate needs to be installed on the far half side of the back door 1 that is located away from the door hinge.
The inner reinforcement 4 may be joined to the inner panel 11 by another welding method such as arc welding instead of spot welding. Moreover, even if the inner reinforcement 4 is joined to the inner panel 11 not by welding but by bolt fastening, the same effect can be obtained.
Furthermore, the number of the first joints B1 and B2 and the second joints A1 to A5 is not limited to the number as in the above-described embodiment, and the positional relationship with respect to the flat part 22 and the door hinge 2 is maintained. If so, it can be increased or decreased in accordance with the size and shape of the inner reinforcement 4.

DESCRIPTION OF SYMBOLS 1 Back door 2 Door hinge 3 License plate 4 Inner reinforcement 4a Upper part 4b Lower part 4c, 4d Lower end part 4e Vertical middle part 11 Inner panel 12 Through-hole 12a Upper side part 12b, 12c Side part 21 Outer panel 22 Plane part 23 Indentation 24 Plate Mounting part 25 Plate support part A1-A5 2nd junction B1, B2 1st junction D1, D2 Direction line

Claims (4)

A back door that opens and closes the opening at the rear of the vehicle body is pivotally attached to the rear of the vehicle body via a pair of door hinges. The back door is configured by an inner panel and an outer panel, and a central portion of the inner panel penetrates the center of the inner panel. A vehicle is provided with a hole, a flat portion on which the license plate is installed, and a mounting portion and a support portion for the license plate at the upper and lower positions of the flat portion. In the back door reinforcement structure,
Between the inner panel and the outer panel, an inner reinforcement that reinforces the inner panel and the outer panel corresponding to the installation location of the license plate is provided, and the outer panel and the inner reinforcement The first joint portion is disposed on the flat portion within a range surrounded by the attachment portion for the license plate and the support portion,
A second joint portion between the inner panel and the inner reinforcement is located on a side portion surrounding the through hole, and is disposed between the direction lines connecting the first joint portion and the door hinge. A vehicle back door reinforcement structure characterized by comprising:   The back door reinforcement for a vehicle according to claim 1, wherein the second joint portion is provided on at least three sides of one side portion of the side portion surrounding the through hole and the side portions on both sides thereof. Construction.   The license plate is installed on a far half side of the back door that is located away from the door hinge, and the second joint portion that is located at a central side portion of the three sides surrounding the through hole. The inner reinforcement between the first joint and the first joint is formed in a substantially Z-shaped cross section when viewed from the side of the vehicle, and is joined to the inner panel on the inner reinforcement having the substantially Z-shaped cross section. And is joined to the outer panel at a lower portion of the inner reinforcement, and an upper and lower intermediate portion of the inner reinforcement having a substantially Z-shaped cross section faces obliquely rearward of the vehicle so as to be located away from the door hinge. The vehicle back door reinforcing structure according to claim 1, wherein the vehicle back door reinforcing structure is extended.   The said 1st junction part is arrange | positioned in the area | region enclosed by the said 2nd junction part located in the said 3 side part of the said through-hole by vehicle back view. A back door reinforcing structure for a vehicle according to claim 1.

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