JP7255956B2 - Vehicle door reinforcement structure - Google Patents

Description

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

A vehicle such as an automobile includes a door that opens and closes a door opening provided in the vehicle body. A vehicle door includes an inner panel arranged inside the vehicle and an outer panel arranged outside the vehicle. A vehicle door is constructed by overlapping and joining an inner panel and an outer panel.

2. Description of the Related Art Conventionally, a vehicle door is provided with a reinforcing member for reinforcing an inner panel. For example, Patent Literature 1 describes that, in a vehicle sliding door that is slidably supported with respect to a vehicle body by a sliding mechanism, a reinforcing member is provided at a mounting portion of the sliding mechanism in the inner panel.

JP 2005-335412 A

The reinforcing member is a plate-like member formed along the vehicle outer side surface of the inner panel. The reinforcing member is joined to the vehicle outer side surface of the inner panel by spot welding or the like. This reinforcing member ensures the rigidity of the inner panel.

For example, when opening and closing a vehicle door, the inner panel may vibrate inward and outward directions of the door. Vibration may cause the inner panel and the reinforcing member to move apart. Accompanying this movement, when the inner panel moves away from the reinforcing member, the inner panel is deformed so as to be pulled at the welding point where the reinforcing member is joined. Therefore, at the welding point between the reinforcing member and the inner panel, stress acts in the direction in which the inner panel and the reinforcing member are separated. If the stress in the peel direction to the weld point becomes excessive, cracks may occur at the weld point.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reinforcing structure for a vehicle door that can reduce the stress in the peeling direction acting on the weld points while ensuring the rigidity of the inner panel.

A reinforcing structure for a vehicle door according to an aspect of the present invention includes:
A reinforcing structure for a vehicle door comprising an inner panel and an outer panel,
a reinforcing member joined to the surface of the inner panel on the vehicle outer side;
The reinforcing member includes a body portion and a joining piece extending from the body portion along the inner panel,
The joining piece has a welding point welded to the inner panel,
A bead portion projecting outside the vehicle is provided between a root portion of the joint piece connected to the main body portion and the welding point.

The vehicle door reinforcement structure described above includes a joint piece having a welding point where the reinforcement member is welded to the inner panel. The joint piece is provided with a bead portion between the root portion and the welding point. According to the vehicle door reinforcing structure described above, when the inner panel is deformed so as to be pulled by the joint piece at the welding point of the joint piece, the bead portion is deformed so as to extend in the extending direction of the joint piece. As a result, the force with which the inner panel is pulled by the joint piece is reduced, and the stress in the peeling direction to the weld point is reduced. Therefore, in the vehicle door reinforcing structure described above, it is possible to reduce the stress in the separation direction acting on the weld points of the joint pieces while ensuring the rigidity of the inner panel by the reinforcing member.

FIG. 1 is a schematic side view showing an inner panel of a sliding door to which a reinforcing structure for a vehicle door according to Embodiment 1 is applied. FIG. 2 is a schematic perspective view showing a first reinforcing member provided in the vehicle door reinforcing structure according to the first embodiment. FIG. 3 is a schematic partial perspective view showing, in an enlarged manner, the vicinity of a welding point of a joining piece in the vehicle door reinforcing structure according to the first embodiment. FIG. 4 is a schematic partial cross-sectional view showing an enlarged vicinity of a welding point of a joining piece in the vehicle door reinforcing structure according to the first embodiment. FIG. 5 is a schematic perspective view showing an enlarged vicinity of a welding point of a joining piece in a vehicle door reinforcing structure according to a comparative example of the first embodiment. FIG. 6 is a schematic partial cross-sectional view showing an enlarged vicinity of a welding point of a joining piece in a vehicle door reinforcement structure according to a comparative example of the first embodiment. FIG. 7 is a schematic perspective view showing an inner panel in a sliding door to which the vehicle door reinforcing structure according to the second embodiment is applied. FIG. 8 is a schematic perspective view showing a second reinforcing member provided in the vehicle door reinforcing structure according to the second embodiment. FIG. 9 is a schematic perspective view showing a third reinforcing member provided in the vehicle door reinforcing structure according to the second embodiment. FIG. 10 is a schematic perspective view showing an inner panel of a back door to which the vehicle door reinforcing structure according to the third embodiment is applied. FIG. 11 is a schematic perspective view showing a fourth reinforcing member provided in the vehicle door reinforcing structure according to the third embodiment.

A specific example of a reinforcing structure for a vehicle door according to an embodiment of the present invention will be described with reference to the drawings. The same reference numerals in the drawings indicate the same names. In the following description, "front", "rear", "up", "down", "left", and "right" refer to directions relative to the front of the vehicle. do. In the drawings, arrow FR indicates the front side of the vehicle, arrow RR indicates the rear side of the vehicle, arrow UP indicates the upper side of the vehicle, arrow LWR indicates the lower side of the vehicle, arrow LH indicates the left side of the vehicle, arrow RH indicates the right side of the vehicle, arrow IN indicates the inside of the vehicle, and arrow OUT indicates the vehicle. Each shows the outside of the vehicle.

[Embodiment 1]
A reinforcement structure for a vehicle door according to the first embodiment (hereinafter sometimes simply referred to as "reinforcement structure") will be described with reference to FIGS. 1 to 4. FIG. FIG. 1 is a side view of an inner panel 101 of a sliding door on the left side of the vehicle, viewed from the outside of the vehicle. In the first embodiment, the vehicle door is a sliding door provided on the side of a vehicle body (not shown), and an example in which the reinforcing structure is applied to the sliding door will be described. Specifically, as shown in FIG. 1, a reinforcing structure including a first reinforcing member 10A (hereinafter sometimes referred to as "lower reinforcing member 10A") is exemplified in a sliding door. One of the features of the reinforcing structure of Embodiment 1 is that the lower reinforcing member 10A includes joint pieces 30A having welding points 31, as shown in FIGS. Another difference is that a bead portion 35 is provided between the root portion 33 (FIG. 2) and the welding point 31 of the joining piece 30A.

[Vehicle door]
First, an outline of a vehicle door to which the reinforcing structure of Embodiment 1 is applied will be described. An inner panel 101 shown in FIG. 1 is an inner panel that constitutes a sliding door. The vehicle door includes an inner panel 101 arranged inside the vehicle and an outer panel (not shown) arranged outside the vehicle. The outer panel is superimposed and joined so as to cover the vehicle outer side of the inner panel 101 (the front side of the paper surface in FIG. 1). A door body is configured by joining the inner panel 101 and the outer panel. The inner panel 101 and the outer panel are made of metal plates such as steel plates. The inner panel 101 and the outer panel are processed into predetermined shapes by press working or the like.

The sliding door is slidably supported in the longitudinal direction with respect to the vehicle body by a sliding mechanism (not shown). A slide mechanism is attached to the slide door. The slide mechanism includes a roller bracket (not shown) that is fitted in a guide rail (not shown) provided along the front-rear direction on the side surface of the vehicle body and has a roller that is guided by the guide rail. Guide rails are usually provided on the upper and lower sides of the vehicle body. The guide rail is also provided in the vertical central portion of the side surface of the vehicle body. The sliding door is supported by a guide rail provided on the side surface of the vehicle body via a roller bracket.

In the sliding door, it is necessary to ensure the rigidity of the portion of the inner panel 101 to which parts such as the roller bracket are attached. For example, a lower roller bracket (not shown) is attached to the front lower portion of the inner panel 101 . The lower roller bracket has a roller that is guided by a lower guide rail provided at the lower portion of the side surface of the vehicle body, among the roller brackets that constitute the slide mechanism. In the reinforcing structure of Embodiment 1, a lower reinforcing member 10A is provided at the front lower portion of the inner panel 101 to which the lower roller bracket is attached. The lower reinforcing member 10A secures the rigidity of the mounting portion of the inner panel 101 for the lower roller bracket.

The configuration of the first reinforcing member (lower reinforcing member) 10A provided in the reinforcing structure of Embodiment 1 will be described in detail below.

(Lower reinforcing member)
As shown in FIG. 1, the lower reinforcing member 10A is provided at the lower front portion of the inner panel 101 and is joined to the surface of the inner panel 101 on the outside of the vehicle. The lower reinforcing member 10A is made of a metal plate such as a steel plate. The lower reinforcing member 10A is formed along the vehicle outer side surface of the inner panel 101 (see also FIG. 2).

(Body part, joint piece)
The lower reinforcing member 10A includes a body portion 20A and a joint piece 30A extending along the inner panel 101 from the body portion 20A. The body portion 20A constitutes the main portion of the reinforcing member 10A, and is a portion provided substantially facing the reinforcement target region of the inner panel. A representative region to be reinforced is a portion to which parts such as a roller bracket and a lock device (see Embodiment 2 described later) are attached. The joining piece 30A is a portion of the reinforcing member 10A that is provided so as to protrude from the main body portion 20A and is smaller than the main body portion 20A. 30 A of joint pieces have the welding point 31 (FIG. 2) mentioned later. A main body portion 20A shown in FIG. 1 is provided at an attachment portion of a lower roller bracket in the inner panel 101. As shown in FIG. In this example, the main body portion 20A is arranged at the corner portion of the front lower portion of the inner panel 101 . The joint piece 30A is provided so as to extend rearward along the lower end of the inner panel 101 from the main body portion 20A. 30 A of joint pieces are formed in strip|belt shape.

The body portion 20A has a mounting hole 25 as shown in FIG. The mounting holes 25 are through holes through which bolts (not shown) for mounting the lower roller bracket to the inner panel 101 are inserted. A mounting hole penetrating through the inner panel 101 is formed in the lower roller bracket mounting portion of the inner panel 101 . The lower roller bracket is fixed by bolts to the surface of the inner panel 101 on the inner side of the vehicle (the back side of the paper surface in FIG. 1). Attachment of the lower roller bracket to the inner panel 101 is performed, for example, as follows. A lower roller bracket is arranged on the surface of the inner panel 101 on the inner side of the vehicle, and a bolt is inserted from the inner side of the vehicle into a bolt hole formed in the base of the lower roller bracket. The inserted bolt is inserted through the mounting hole of the inner panel and the mounting hole 25 of the main body portion 20A, and a nut (not shown) is tightened on the bolt from the outside of the vehicle.

(welding point)
The lower reinforcing member 10A is joined to the inner panel 101 by spot welding. As shown in FIG. 2, main body 20A has welding points 21 that are welded to inner panel 101 (FIG. 1). In this example, the body portion 20A has a plurality of welding points 21. As shown in FIG. Black circles in FIGS. 2 and 3 virtually indicate welding points of spot welding.

The joining piece 30A, as shown in FIG. 2, has a welding point 31 to be welded to the inner panel 101 (FIG. 1). In this example, one welding point 31 is provided at the tip of the joining piece 30A.

(Bead part)
The joint piece 30A has a bead portion 35 between a root portion 33 connected to the body portion 20A and a welding point 31 (see also FIG. 3). The bead portion 35 is provided so as to protrude outwardly of the vehicle. The bead portion 35 is a bent portion of the joint piece 30A, and is formed by bending the joint piece 30A so as to protrude outwardly of the vehicle. In this example, as shown in FIG. 3, the joining piece 30A is bent in a U shape so that the internal space of the bead portion 35 is formed in a square shape when the joining piece 30A is viewed from above. The bead portion 35 may be formed by bending the joint piece 30A in a V shape so that the internal space of the bead portion 35 is formed in a triangular shape when the joint piece 30A is viewed from above. In addition, in this example, one bead portion 35 is provided on the joining piece 30A, but a plurality of bead portions 35 may be provided.

(Movement of the inner panel and joint piece when opening and closing the door)
The movement of the inner panel 101 and the joint piece 30A when opening and closing the sliding door in the reinforcing structure of the first embodiment will be described with reference to FIG. FIG. 4 is a partial cross-sectional view taken along the IV-IV line in the vicinity of the welding point 31 in the joining piece 30A shown in FIG. FIG. 4A shows the state of the inner panel 101 and the joint piece 30A in the initial state before opening and closing the sliding door. FIG. 4B shows a state in which the inner panel 101 moves away from the joint piece 30A due to vibration of the inner panel 101 when the slide door is opened and closed.

In the initial state, as shown in FIG. 4A, the joint piece 30A is arranged along the surface of the inner panel 101 on the outer side of the vehicle. More specifically, both sides of the joint piece 30A sandwiching the bead portion 35 face each other along the inner panel 101 . In the initial state, no external force is applied to the sliding door, so the inner panel 101 and the joint piece 30A remain stationary without being deformed. When the sliding door is opened and closed, an external force is applied to the sliding door. Due to this external force, the inner panel 101 may vibrate in the vehicle inward and outward directions, causing the inner panel 101 and the joint piece 30A to move apart. When the inner panel 101 moves away from the joint piece 30A, the inner panel 101 is pulled and elastically deformed at the welding point 31 where the joint piece 30A is joined, as shown in FIG. 4B. When the inner panel 101 is deformed so as to be pulled at the welding point 31, the bead portion 35 provided on the joint piece 30A is elastically deformed so as to follow the deformation of the inner panel 101. As shown in FIG. That is, the bead portion 35 functions as a margin of elongation within the range of elastic deformation. Therefore, since the force with which the inner panel 101 is pulled by the joint piece 30A is reduced, the stress acting in the direction in which the inner panel 101 and the joint piece 30A are separated from each other at the welding point 31 is suppressed.

Furthermore, in this example, the width of the joining piece 30A (dimension in the vertical direction in FIG. 2) is smaller than the width of the main body 20A (FIG. 2). Therefore, the joint piece 30A can easily follow the deformation of the inner panel 101 . Therefore, the stress in the peeling direction to the welding point 31 is more likely to be suppressed. In addition, since the width of the connecting piece 30A is narrowed, the material can be reduced accordingly, so that the weight can be reduced.

A comparative example in which the joint piece 30A is not provided with the bead portion 35 (FIG. 3) as shown in FIG. 5 will be described with respect to the reinforcing structure of the first embodiment. The reinforcement structure according to the comparative example shown in FIG. 5 has the same configuration as that of Embodiment 1 shown in FIG. With reference to FIG. 6, the movement of the inner panel 101 and the joint piece 30A when opening and closing the sliding door in the reinforcement structure of the comparative example will be described. FIG. 6 is a partial cross-sectional view taken along the line VI--VI in the vicinity of the welding point 31 in the joining piece 30A shown in FIG. FIG. 6A shows the state of the inner panel 101 and the joint piece 30A in the initial state before opening and closing the sliding door. FIG. 6B shows a state in which the inner panel 101 moves away from the joint piece 30A due to vibration of the inner panel 101 when the slide door is opened and closed.

In the case of the comparative example as well, when the sliding door is opened and closed, if the inner panel 101 moves away from the joint piece 30A, as shown in FIG. , the inner panel 101 is pulled and elastically deformed. In the comparative example, the joining piece 30A does not have the bead portion 35 unlike the first embodiment. That is, even if the inner panel 101 moves away from the joint piece 30A, the joint piece 30A in the comparative example has no elongation that deforms following the behavior. Therefore, the force with which the inner panel 101 is pulled by the joint piece 30A is greater than in the case of the first embodiment. Rise.

<Verification example>
For each slide door to which the reinforcement structure of the first embodiment and the reinforcement structure of the comparative example are applied, the stress in the peeling direction acting on the welding point during opening and closing was analyzed by CAE (Computer Aided Engineering). By stress analysis, the maximum stress in the peeling direction acting on the welding point 31 in the joining piece 30A was determined. As a result, in the reinforcement structure of Embodiment 1, the maximum stress could be reduced by approximately 14.5% compared to the reinforcement structure of the comparative example.

(others)
As another configuration of the lower reinforcing member 10A shown in FIG. 2, as shown in FIG. Specifically, when the joining piece 30A is viewed from the vehicle outer side, the upper sides of the portions located on both sides of the bead portion 35 are inclined toward the bead portion 35 in a valley shape. Portions located on both sides of the bead portion 35 are in contact with the inner panel 101 . The inner panel 101 (FIG. 1) is electrocoated with the lower reinforcing member 10A joined. In the electrodeposition coating, the inner panel 101 is immersed in an electrodeposition paint to electrodeposit the paint, then the inner panel 101 is pulled up and the paint is heated and cured. Since the joint piece 30A has the inclined surface 40, when the inner panel 101 is pulled up, the electrodeposition paint remaining on the upper surface of the joint piece 30A flows along the inclined surface 40 toward the bead portion 35, and flows inside the bead portion 35. Flow down through space. Therefore, it is difficult for the electrodeposition paint to accumulate on the upper surface of the joining piece 30A.

[Embodiment 2]
In Embodiment 1, as shown in FIG. 1, the sliding door is exemplified with a reinforcing structure including a first reinforcing member (lower reinforcing member) 10A. In the second embodiment, as shown in FIG. 7, the sliding door includes a second reinforcing member 10B (hereinafter sometimes referred to as "center reinforcing member 10B") and a third reinforcing member 10C (hereinafter referred to as "lock portion 10C").

Hereinafter, the configurations of the second reinforcing member (center reinforcing member) 10B and the third reinforcing member (lock portion reinforcing member) 10C provided in the reinforcing structure of the second embodiment will be described in detail with reference to FIGS. . FIG. 7 is a perspective view of the inner panel 102 of the sliding door on the right side of the vehicle as seen from the inside of the vehicle.

In the sliding door, for example, a center roller bracket (not shown) is attached to the rear side of the inner panel 102 at the center in the vertical direction. The center roller bracket has a roller that is guided by a center guide rail that is provided in the center of the side surface of the vehicle body in the vertical direction. A locking device (not shown) is attached to the rear end of the inner panel 102 . In the reinforcing structure of the second embodiment, a center reinforcing member 10B is provided at the central portion on the rear side of the inner panel 102 to which the center roller bracket is attached. The center reinforcing member 10B secures the rigidity of the inner panel 102 where the center roller bracket is attached. Further, in the reinforcement structure of the second embodiment, the lock portion reinforcement member 10C is provided at the rear end portion of the inner panel 102 to which the lock device is attached. The locking portion reinforcing member 10C secures the rigidity of the mounting portion of the locking device on the inner panel 102 .

(Center reinforcing member)
As shown in FIG. 7, the center reinforcing member 10B is provided on the rear side of the inner panel 102 at the center in the vertical direction. The center reinforcing member 10B is joined to the surface of the inner panel 102 on the outside of the vehicle (back side of the paper surface in FIG. 7). The center reinforcing member 10B is made of a metal plate such as a steel plate, and is formed along the vehicle outer side surface of the inner panel 102 (see also FIG. 8).

(Body part, joint piece)
The center reinforcing member 10B includes a body portion 20B and a joint piece 30B extending along the inner panel 102 from the body portion 20B. The main body portion 20B is provided at the mounting portion of the center roller bracket in the inner panel 102 . In this example, the body portion 20B is arranged in the central portion on the rear side of the inner panel 102 . The joint piece 30B is provided in front of the body portion 20B.

The body portion 20B has a mounting hole 26 as shown in FIG. The mounting holes 26 are through holes through which bolts (not shown) for mounting the center roller bracket to the inner panel 102 are inserted. A mounting hole penetrating through the inner panel 102 is formed in the mounting portion of the center roller bracket in the inner panel 102 . The center roller bracket is fixed to the surface of the inner panel 102 on the inner side of the vehicle (on the front side of the sheet of FIG. 7) with bolts.

(welding point)
The center reinforcing member 10B is joined to the inner panel 102 by spot welding. As shown in FIG. 8, main body portion 20B has welding points 21 that are welded to inner panel 102 (FIG. 7). In this example, body portion 20B has a plurality of welding points 21 . Black circles in FIG. 8 virtually indicate welding points of spot welding.

The joining piece 30B, as shown in FIG. 8, has a welding point 31 to be welded to the inner panel 102 (FIG. 7). In this example, three welding points 31 are provided at the tip of the joining piece 30B.

(Bead part)
The joining piece 30B has a bead portion 35 between the root portion 33 connected to the body portion 20B and the welding point 31. As shown in FIG. The bead portion 35 is provided so as to protrude outwardly of the vehicle. In this example, as shown in FIG. 8, the bead portion 35 is formed by bending the joining piece 30B into a U shape. The bead portion 35 may be formed by bending the joining piece 30B into a V shape. In addition, in this example, one bead portion 35 is provided on the joining piece 30B, but a plurality of bead portions 35 may be provided.

As another configuration of the center reinforcing member 10B shown in FIG. 8, an inclined surface that slopes downward toward the bead portion 35 may be formed on the upper surface of the joint piece 30B. Specifically, when the joining piece 30B is viewed from the vehicle outer side, the upper sides of the portions located on both sides of the bead portion 35 are inclined toward the bead portion 35 in a valley shape. Since the joint piece 30B has such an inclined surface, when the inner panel 102 (FIG. 7) is electrodeposited with the center reinforcing member 10B joined, the electrodeposition paint is less likely to accumulate on the upper surface of the joint piece 30B. . This is because the electrodeposition paint remaining on the upper surface of the joining piece 30B flows along the inclined surface toward the bead portion 35 and flows down through the inner space of the bead portion 35 .

(lock reinforcing member)
The locking portion reinforcing member 10C is provided at the rear end portion of the inner panel 102, as shown in FIG. The locking portion reinforcing member 10C is joined to the surface of the inner panel 102 on the outer side of the vehicle (back side of the paper surface in FIG. 7). The locking portion reinforcing member 10C is made of a metal plate such as a steel plate, and is formed along the vehicle outer side surface of the inner panel 102 (see also FIG. 9).

(Body part, joint piece)
The locking portion reinforcing member 10C includes a body portion 20C and a joint piece 30C extending along the inner panel 102 from the body portion 20C. The body portion 20C is provided at a portion of the inner panel 102 where the lock device is attached. In this example, the body portion 20C is arranged at the rear end portion of the inner panel 102 . The joint piece 30C is provided along the periphery of the inner panel 102 from the main body portion 20C.

The body portion 20C has a mounting hole 27 as shown in FIG. The mounting hole 27 is a through hole through which a bolt (not shown) for mounting the locking device to the inner panel 102 is inserted. A mounting hole penetrating through the inner panel 102 is formed in the mounting portion of the lock device in the inner panel 102 . The lock device is fixed by bolts to the surface of the main body portion 20C on the outside of the vehicle.

(welding point)
The lock portion reinforcing member 10C is joined to the inner panel 102 by spot welding. As shown in FIG. 9, the body portion 20C has welding points 21 that are welded to the inner panel 102 (FIG. 7). In this example, the body portion 20C has a plurality of welding points 21. As shown in FIG. Black circles in FIG. 9 virtually indicate welding points of spot welding.

The joint piece 30C has a welding point 31 welded to the inner panel 102 (FIG. 7), as shown in FIG. In this example, three welding points 31 are provided at the tip of the joining piece 30C.

(Bead part)
The joining piece 30C has a bead portion 35 between the root portion 33 connected to the body portion 20C and the welding point 31. As shown in FIG. The bead portion 35 is provided so as to protrude outwardly of the vehicle. In this example, as shown in FIG. 9, the bead portion 35 is formed by bending the joining piece 30C into a U shape. The bead portion 35 may be formed by bending the joining piece 30C into a V shape. In addition, in this example, one bead portion 35 is provided on the joining piece 30C, but a plurality of bead portions 35 may be provided.

As another configuration of the locking portion reinforcing member 10C shown in FIG. 9, an inclined surface that slopes downward toward the bead portion 35 may be formed on the upper surface of the joint piece 30C. Specifically, when the joining piece 30B is viewed from the vehicle outer side, the upper sides of the portions located on both sides of the bead portion 35 are inclined toward the bead portion 35 in a valley shape. Since the joint piece 30C has such an inclined surface, when the inner panel 102 (FIG. 7) is electrodeposited with the lock portion reinforcing member 10C joined, the electrodeposition paint is less likely to accumulate on the upper surface of the joint piece 30C. Become. This is because the electrodeposition paint remaining on the upper surface of the joint piece 30</b>C flows along the inclined surface toward the bead portion 35 and flows down through the inner space of the bead portion 35 .

[Embodiment 3]
Embodiments 1 and 2 explained the reinforcement structure in the sliding door. A vehicle door to which the reinforcing structure according to the embodiment of the present invention is applied is not limited to a sliding door. In the third embodiment, an example of application to a back door provided at the rear part of the vehicle body will be described. In Embodiment 3, as shown in FIG. 10, a back door is exemplified with a reinforcing structure including a fourth reinforcing member 10D (hereinafter sometimes referred to as "lock portion reinforcing member 10D").

Hereinafter, the configuration of the fourth reinforcing member (lock portion reinforcing member) 10D provided in the reinforcing structure of the third embodiment will be described in detail with reference to FIGS. 10 and 11. FIG. FIG. 10 is a perspective view of the inner panel 103 that constitutes the back door, viewed from the outside of the vehicle. In the case of a back door, the front side is located inside the vehicle and the rear side is located outside the vehicle.

A lock device (not shown) is attached to, for example, the lower portion of the inner panel 103 of the back door. In the reinforcing structure of the third embodiment, a locking portion reinforcing member 10D is provided under the inner panel 103 to which the locking device is attached. The locking portion reinforcing member 10D secures the rigidity of the mounting portion of the locking device on the inner panel 103. As shown in FIG.

(lock reinforcing member)
The locking portion reinforcing member 10D is provided below the inner panel 103, as shown in FIG. The locking portion reinforcing member 10D is joined to the surface of the inner panel 103 on the outer side of the vehicle (on the front side of the paper in FIG. 10). The lock portion reinforcing member 10D is made of a metal plate such as a steel plate, and is formed along the vehicle outer side surface of the inner panel 103 (see also FIG. 11).

(Body part, joint piece)
The locking portion reinforcing member 10D includes a body portion 20D and a joint piece 30D extending along the inner panel 103 from the body portion 20D. The main body portion 20D is provided at a portion of the inner panel 103 where the lock device is attached. In this example, the body portion 20D is arranged below the inner panel 103. As shown in FIG. The joint piece 30D is provided along the periphery of the inner panel 103 from the body portion 20D.

The body portion 20D has a mounting hole 28 as shown in FIG. The mounting hole 28 is a through hole through which a bolt (not shown) for mounting the locking device to the inner panel 103 is inserted. A mounting hole penetrating through the inner panel 103 is formed in the mounting portion of the lock device in the inner panel 103 . The lock device is fixed by bolts to the surface of the body portion 20D on the outside of the vehicle (specifically, the upper side).

(welding point)
The lock portion reinforcing member 10D is joined to the inner panel 103 by spot welding. As shown in FIG. 11, main body portion 20D has welding points 21 that are welded to inner panel 103 (FIG. 10). In this example, the body portion 20D has a plurality of welding points 21. As shown in FIG. Black circles in FIG. 11 virtually indicate welding points of spot welding.

The joining piece 30D has a welding point 31 welded to the inner panel 103 (FIG. 10), as shown in FIG. In this example, three welding points 31 are provided at the tip of the joining piece 30D.

(Bead part)
The joining piece 30D has a bead portion 35 between the root portion 33 connected to the body portion 20D and the welding point 31. As shown in FIG. The bead portion 35 is provided so as to protrude outwardly of the vehicle. In this example, as shown in FIG. 11, the bead portion 35 is formed by bending the joining piece 30D into a U shape. The bead portion 35 may be formed by bending the joining piece 30D into a V shape. In addition, in this example, one bead portion 35 is provided on the joining piece 30D, but a plurality of bead portions 35 may be provided.

<Action and effect>
The vehicle door reinforcement structure according to Embodiments 1 to 3 includes a reinforcement member at a portion of the inner panel to which parts such as a roller bracket and a locking device are attached. Rigidity can be ensured by providing the main body portion of the reinforcing member at the component mounting portion of the inner panel. Also, the reinforcing member has a joint piece having a welding point, and the joint piece is provided with a bead portion. When the inner panel and the joining piece move apart due to vibration, such as when the door is opened and closed, the bead provided on the joining piece deforms so as to extend, following the deformation of the inner panel. Therefore, at the welding point of the joint piece, the force with which the inner panel is pulled by the joint piece is reduced, so that the stress in the peeling direction to the weld point can be reduced. Therefore, the reinforcing structure described above can reduce the stress acting on the welding points of the joint pieces in the peeling direction while ensuring the rigidity of the inner panel by the reinforcing member.

The present invention is not limited to these examples, but is indicated by the scope of the claims, and is intended to include all modifications within the meaning and scope of equivalents of the scope of the claims. In the first to third embodiments described above, examples of application to a sliding door and a back door have been described, but the reinforcing structure of the present invention can be applied to any vehicle door in which the inner panel is provided with a reinforcing member. The reinforcing structure of the present invention may be applied to a hinged door that is rotatably supported on the side of a vehicle body by a hinge mechanism.

INDUSTRIAL APPLICABILITY The vehicle door reinforcing structure of the present invention can be suitably used for automobile doors such as sliding doors and back doors.

101, 102, 103 Inner panel 10A, 10B, 10C, 10D Reinforcing member 20A, 20B, 20C, 20D Body part 21 Welding point 25, 26, 27, 28 Mounting hole 30A, 30B, 30C, 30D Joint piece 31 Welding point 33 Root portion 35 Bead portion 40 Inclined surface

Claims (1)

A reinforcing structure for a vehicle door comprising an inner panel and an outer panel,
a reinforcing member joined to the surface of the inner panel on the vehicle outer side;
The reinforcing member includes a body portion and a joining piece extending from the body portion along the inner panel,
The joining piece has a welding point welded to the inner panel,
A bead portion projecting to the outside of the vehicle is provided between the root portion of the joint piece connected to the main body portion and the welding point ,
The bead portion is provided such that an internal space along the vertical direction is formed between the bead portion and the inner panel,
The upper surface of the joining piece is formed with an inclined surface that slopes downward toward the bead portion,
A reinforcement structure for a vehicle door.

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