JP2016097894A - back door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back door capable of effectively ensuring the rigidity of the back door and reducing cabin noise even when a bent part is formed in an outer panel.SOLUTION: An inner-side bead part 31 is formed on an inner panel 3, and a reinforcement-side bead part 41 is formed on a reinforcement member 4 disposed on the inner panel 3. A trough part 22 having a bent part 21 bent inward and extending substantially horizontally so that a surface shape of an outer panel 2 is closer to the inner panel 3 is formed on the outer panel 2. Positions of both sides of the reinforcement member 4 between which the reinforcement-side bead part 41 is sandwiched are spot-welded to the inner-side bead part 31. The reinforcement-side bead part 41 is bonded to the bent part 21 by adhesive 5.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a back door attached to an opening of an automobile body.

A back door attached to an opening of an automobile body so as to be openable and closable is configured by caulking an outer panel on the outer side of the inner panel. The back door is required to have rigidity that does not vibrate due to engine vibration.
For example, in patent document 1, the reinforcement structure of the back door of the motor vehicle provided with an inner panel and an outer panel is disclosed. In this reinforcing structure, in order to suppress the vibration of the entire skirt of the back door, a first reinforcement extending in the lateral direction of the vehicle body and a second extending in the longitudinal direction of the vehicle body are provided between the inner panel and the outer panel. It is disclosed to provide a reinforce.

JP-A-6-211049

  By the way, in the outer panel of the back door, in response to a request on the appearance of the design, a trough that is bent inward so as to approach the inner panel is formed, and in this trough, a bent portion in which the surface shape of the outer panel is bent is formed. Sometimes formed. When this bent portion is formed, the rigidity of the outer panel is reduced at the bent portion, the natural frequency of the back door is significantly reduced, and this natural frequency is equal to the frequency associated with the combustion cycle of the engine. There is a risk of approaching. In particular, when the frequency associated with the combustion cycle of the engine matches the natural frequency of the back door, the back door vibrates greatly due to a resonance phenomenon. This vibration of the back door induces a change in the volume of air in the vehicle and affects the sound in the vehicle.

  The present invention has been made in view of such a background, and even when a bent portion is formed on the outer panel, it is possible to effectively ensure the rigidity of the back door and reduce vehicle interior noise. It was obtained by trying to provide a back door.

One aspect of the present invention is a back door that is attached to an opening of an automobile body so as to be openable and closable, and is configured using an inner panel and an outer panel,
A hinge portion for allowing the back door to be opened and closed with respect to the automobile body is provided at an upper portion of the back door, and the back door is attached to the automobile body at a lower portion of the back door. There is a lock part to lock the closed state,
A reinforcing member that reinforces the inner panel is disposed on the outer surface of the inner panel that faces the outer panel.
The inner panel has an inner bead portion that bulges outward to approach the outer panel,
In a part of the portion facing the inner side bead portion in the reinforcing member, a reinforcing side bead portion that swells outward so as to approach the outer panel is formed,
The outer panel is formed with a trough that is bent inward so that the surface shape of the outer panel approaches the inner panel, and has a bent portion extending in a substantially horizontal direction.
The positions of both sides of the reinforcing member sandwiching the reinforcing side bead portion are welded to the inner side bead portion,
The reinforcing side bead portion and the bent portion or the vicinity of the bent portion are bonded to each other by an adhesive.

In the said back door, when the bent part extended in a substantially horizontal direction is formed in the outer panel which comprises a back door, the device which suppresses the fall of the rigidity of an outer panel is devised.
Specifically, the positions of both sides of the reinforcing member sandwiching the reinforcing side bead portion are welded to the inner side bead portion, and the reinforcing side bead portion and the bent portion or the vicinity of the bent portion are joined by an adhesive. Has been. Thereby, the bent part of the outer panel or the vicinity of the bent part is integrated with the inner panel via the adhesive and the reinforcing member, and the rigidity of the bent part can be increased.

  Therefore, even if the bent portion is formed on the outer panel, it is possible to effectively ensure the rigidity of the back door and suppress the decrease in the natural frequency of the back door. As a result, the natural frequency of the back door is less likely to coincide with the frequency associated with the combustion cycle of the engine, the change in the volume of air in the vehicle due to the vibration of the back door can be suppressed, and the vehicle interior noise can be reduced.

Therefore, according to the said back door, even if it is a case where the bending part is formed in the outer panel, the rigidity of a back door can be ensured effectively and a vehicle interior sound can be reduced.
The substantially horizontal direction in which the bent portion extends includes a direction having an inclination angle of 20 ° or less with respect to the horizontal direction in addition to a state parallel to the horizontal direction. Further, the bent portion is formed on at least one of the upper edge portion and the lower edge portion of the valley portion.

Explanatory drawing which shows the state concerning the Example in the state which looked at the back door from the back side. Explanatory drawing which shows the back door concerning the Example in the state seen from the back side in the state which removed the outer panel. The perspective view which shows the reinforcement member concerning an Example. Sectional drawing which shows the AA line cross section in FIG. 1 concerning an Example, and shows the state which joined the bending part of the outer panel to the reinforcement side bead part of the reinforcement member with the adhesive agent. The perspective view which shows the back door in the body for motor vehicles concerning an Example.

A preferred embodiment of the above-described back door will be described with reference to the drawings.
(Example)
As shown in FIG. 5, the back door 1 of this example is attached to the opening 61 of the automobile body 6 so as to be openable and closable, and is configured using the inner panel 3 and the outer panel 2. A hinge part 62 is provided at the upper part of the back door 1 so that the back door 1 can be opened and closed with respect to the automobile body 6, and at the lower part of the back door 1, the back door 1 is connected to the automobile body 6. A lock portion 63 is provided for locking the closed state.

  As shown in FIG. 2, a reinforcing member 4 that reinforces the inner panel 3 is disposed on the outer surface 301 of the inner panel 3 that faces the outer panel 2. The inner panel 3 is formed with an inner bead portion 31 that bulges outward so as to approach the outer panel 2. As shown in FIG. 3, a reinforcement-side bead portion 41 that bulges outward so as to approach the outer panel 2 is formed in a part of the reinforcing member 4 that faces the inner-side bead portion 31.

  As shown in FIG. 1, the outer panel 2 is formed with a valley portion 22 having a bent portion 21 that is bent inward so that the surface shape of the outer panel 2 approaches the inner panel 3 and extends in a substantially horizontal direction. The bent portion 21 of this example is formed at the lower edge portion of the valley portion 22. As shown in FIGS. 3 and 4, the positions on both sides of the reinforcing member 4 with the reinforcing side bead portion 41 sandwiched are spot welded to the inner side bead portion 31. The reinforcing side bead part 41 and the bent part 21 are joined together by the adhesive 5. In FIGS. 3 and 4, a state where the positions 42 on both sides sandwiching the reinforcing side bead portion 41 are spot-welded to the inner side bead portion 31 is indicated by a symbol S.

Below, the back door 1 of this example is explained in full detail with reference to FIGS.
As shown in FIG. 1, the outer panel 2 is a panel exposed on the surface of an automobile, and is a panel that requires a design appearance. In principle, spot welding or the like is not performed on the outer panel 2. The bent portions 21 in the outer panel 2 of the back door 1 of the present example are formed on the left and right sides of the license plate mounting position 11. The bent portion 21 extends in the left-right direction of the outer panel 2 at an inclination angle within 10 ° with respect to the horizontal direction.
As shown in FIG. 4, the bent portion 21 of the present example is a portion where a line-shaped depression is formed on the outer surface (front surface) 201 of the outer panel 2 at a position where the outer panel 2 is bent. The bent portion 21 is formed at the lower edge of the valley portion 22 in the outer panel 2 and is bent with a smaller radius of curvature than a bent portion formed in another portion.

As shown in FIG. 2, the inner side bead portions 31 in the inner panel 3 are inclined with respect to the vertical direction so as to be positioned at the center side in the left and right direction toward the lower side on both the left and right sides of the license plate mounting position 11. Is formed. The inner side bead portion 31 is a bead-shaped portion formed to ensure the rigidity of the inner panel 3.
The inner side bead portion 31 is formed substantially parallel to the reinforcing side bead portion 41, and the reinforcing side bead portion 41 is formed so as to intersect with the bent portion 21.

  As shown in FIGS. 2 and 3, the reinforcing member 4 is a reinforcement and is arranged around the arrangement positions 12 of the left and right lamps in the back door 1. In addition, the reinforcing member 4 is spot welded to the inner panel 3 and the outer panel 2 at a position below and to the side of the window portion forming position 13 of the back door 1. The inner panel 3 is a panel covered with the outer panel 2 and the interior material, and the design appearance is not limited. The reinforcing member 4 is attached to the inner panel 3 by spot welding at a plurality of locations.

  As shown in FIG. 3, the reinforcing side bead portion 41 in the reinforcing member 4 is formed at a position overlapping with a part of the inner side bead portion 31 on both the left and right sides of the license plate mounting position 11. Further, the reinforcing bead portion 41 is formed in the vicinity of the lower end portion on the center side of the left and right reinforcing members 4. The reinforcing bead portion 41 is formed by protruding a part of the reinforcing member 4 into a substantially rectangular shape on a plane. And the front end surface (outer surface) 411 of the reinforcement bead part 41 is formed in a substantially rectangular shape. The reinforcement-side bead portion 41 is a bead-shaped portion formed to ensure the rigidity of the reinforcement member 4.

  As shown in FIGS. 2 and 5, the hinge portion 62 of the back door 1 is a portion that allows the upper edge portion of the opening 61 of the automobile body 6 and the upper portion of the back door 1 to rotate. The hinge portion 62 is provided at the left and right positions of the upper edge of the opening 61 of the automobile body 6 and the upper portion of the back door 1. Further, the lock portion 63 of the back door 1 is configured such that when the back door 1 is closed by the opening 61 of the automobile body 6, the lower portion of the back door 1 is placed on the lower edge of the opening 61 of the automobile body 6. The part to lock.

A locked portion 631 that engages the lock portion 63 is provided at the lower edge portion of the opening 61 of the automobile body 6. One of the lock part 63 and the locked part 631 is formed by a lock mechanism having a hook part, and the other is formed by a striker to which the hook part is locked. The hook portion is maintained in a state of being locked to the striker by receiving an urging force of the spring.
Further, dampers 66 utilizing the viscosity of the hydraulic oil are respectively provided between the left and right side portions 65 of the back door 1 and the left and right edge portions 64 of the opening 61 of the automobile body 6. The damper 66 provides support when a person opens the back door 1 from the opening 61 of the automobile body 6.

  FIG. 4 shows a cross section at a position where the bent portion 21 is formed on the outer panel 2. As shown in the figure, when the inner panel 3 to which the reinforcing member 4 is attached and the outer panel 2 are combined, a predetermined gap K is formed between the reinforcing bead portion 41 of the reinforcing member 4 and the outer panel 2. It has come to be. In the gap K, an adhesive 5 such as mastic is provided, and the front end surface 411 of the reinforcing bead portion 41 and the inner side surface (back surface) 202 of the outer panel 2 are bonded by the adhesive 5.

The upper and lower positions 42 across the reinforcing bead 41 in the reinforcing member 4 face the inner bead 31 of the inner panel 3 and are welded to the inner bead 31 by spot welding.
The inner panel 3 is a panel that is more easily roughened than the outer panel 2 and is more rigid than the outer panel 2. Further, since the reinforcing member 4 is provided on the inner panel 3, the rigidity of the inner panel 3 is further increased.

In the back door 1 of this example, when the bent part 21 extended in a substantially horizontal direction is formed in the outer panel 2 which comprises the back door 1, the device which suppresses the fall of the rigidity of the outer panel 2 is devised. .
Specifically, the positions 42 on both sides of the reinforcing member 4 sandwiching the reinforcing side bead portion 41 are welded to the inner side bead portion 31, and the reinforcing side bead portion 41 and the bent portion 21 are bonded by the adhesive 5. It is joined. Thereby, the bending part 21 of the outer panel 2 is integrated with the inner panel 3 via the adhesive 5 and the reinforcing member 4, and the rigidity of the bending part 21 can be improved.

  Therefore, even when the bent portion 21 is formed on the outer panel 2, the rigidity of the back door 1 can be effectively ensured, and the decrease in the natural frequency of the back door 1 can be suppressed. As a result, the natural frequency of the back door 1 is less likely to coincide with the frequency associated with the combustion cycle of the engine, the volume change of the air in the vehicle due to the vibration of the back door 1 can be suppressed, and the vehicle interior noise can be reduced.

Moreover, the opening / closing intensity | strength of the back door 1 can also be raised by ensuring the rigidity of the back door 1 effectively. Thereby, not only vibration performance but also strength performance can be secured.
Furthermore, by improving the bead portion 41 for reinforcement on the reinforcing member 4, vibration performance and strength can be easily achieved by adding spot welding construction sites and adhesive 5 construction sites without increasing the number of parts. Performance can be ensured.

  Therefore, according to the back door 1 of this example, even when the bent portion 21 is formed on the outer panel 2, the rigidity of the back door 1 can be effectively ensured and the vehicle interior noise can be reduced. Can do.

  The reinforcing member 4 may be a separate member that is welded to the inner bead portion 31 in addition to the reinforcement disposed around the left and right lamp arrangement positions 12. In this case, the reinforcing member 4 can be formed small.

DESCRIPTION OF SYMBOLS 1 Back door 2 Outer panel 21 Bending part 22 Valley part 3 Inner panel 31 Inner side bead part 4 Reinforcement member 41 Reinforcement side bead part 5 Adhesive 6 Automobile body 61 Opening part 62 Hinge part 63 Lock part

Claims (1)

A back door that is attached to an opening of an automobile body so as to be openable and closable using an inner panel and an outer panel,
A hinge portion for allowing the back door to be opened and closed with respect to the automobile body is provided at an upper portion of the back door, and the back door is attached to the automobile body at a lower portion of the back door. There is a lock part to lock the closed state,
A reinforcing member that reinforces the inner panel is disposed on the outer surface of the inner panel that faces the outer panel.
The inner panel has an inner bead portion that bulges outward to approach the outer panel,
In a part of the portion facing the inner side bead portion in the reinforcing member, a reinforcing side bead portion that swells outward so as to approach the outer panel is formed,
The outer panel is formed with a trough that is bent inward so that the surface shape of the outer panel approaches the inner panel, and has a bent portion extending in a substantially horizontal direction.
The positions of both sides of the reinforcing member sandwiching the reinforcing side bead portion are welded to the inner side bead portion,
The back door characterized in that the reinforcing side bead portion and the bent portion or the vicinity of the bent portion are joined by an adhesive.

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