JP2020138598A - Reinforcement structure for vehicle door - Google Patents

Abstract

To provide a reinforcement structure for a vehicle door capable of reducing stress in a peeling direction acting on a welded point while securing rigidity of an inner panel.SOLUTION: A reinforcement structure for a vehicle door is provided with a reinforcement member 10A connected on a surface of a vehicle outer side of an inner panel. The reinforcement member 10A is provided with a body part 20A and a connecting piece 30A extending along the inner panel from the body part 20A. The connecting piece 30A has a welding point 31 to be welded on the inner panel. A bead part 35 projecting to the vehicle outer side is arranged between a root part 33 connected on the body part 20A and the welding point 31 of the connecting piece 30A.SELECTED DRAWING: Figure 2

Description

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

Vehicles such as automobiles are provided with a door that opens and closes a door opening provided in the vehicle body. The vehicle door includes an inner panel arranged inside the vehicle and an outer panel arranged outside the vehicle. The vehicle door is formed by superimposing and joining the inner panel and the outer panel.

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

Japanese Unexamined Patent Publication No. 2005-335421

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

For example, when opening and closing a vehicle door, the inner panel may vibrate in and out of the door. Due to vibration, the inner panel and the reinforcing member may move apart. When the inner panel moves away from the reinforcing member along with this movement, 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 from each other. If the stress in the peeling direction to the welding point becomes excessive, cracks may occur at the welding point.

One of an object of the present invention is to provide a reinforcing structure for a vehicle door that can reduce the stress in the peeling direction acting on the welding point while ensuring the rigidity of the inner panel.

The vehicle door reinforcement structure according to one aspect of the present invention is
It is a reinforcement structure for vehicle doors with inner panels and outer panels.
A reinforcing member to be joined to the outer surface of the vehicle of the inner panel is provided.
The reinforcing member includes a main body portion and a joint piece extending from the main body portion along the inner panel.
The joint piece has a weld point to be 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 vehicle door reinforcement structure described above comprises a joint piece having a weld point at which the reinforcement member is welded to the inner panel. A bead portion is provided on the joint piece between the root portion and the welding point. According to the above-mentioned reinforcing structure of the vehicle door, when the inner panel is deformed so as to be pulled by the joint piece at the welding point in the joint piece, the bead portion is deformed so as to extend in the extending direction of the joint piece. Therefore, 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 welding point is reduced. Therefore, in the above-mentioned reinforcing structure of the vehicle door, the stress in the peeling direction acting on the welding point in the joint piece can be reduced while ensuring the rigidity of the inner panel by the reinforcing member.

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

A specific example of the reinforcing structure for the vehicle door according to the embodiment of the present invention will be described with reference to the drawings. The same reference numerals in the figure indicate the same names. In the following explanation, "front", "rear", "top", "bottom", "left", and "right" mean the direction in which the front of the vehicle is defined as "front". To do. In the drawing, arrow FR is the front side of the vehicle, arrow RR is the rear side of the vehicle, arrow UP is the upper side of the vehicle, arrow LWR is the lower side of the vehicle, arrow LH is the left side of the vehicle, arrow RH is the right side of the vehicle, arrow IN is the inside of the vehicle, and arrow OUT is the inside of the vehicle. The outside of the vehicle is shown respectively.

[Embodiment 1]
The vehicle door reinforcing structure (hereinafter, may be simply referred to as “reinforcing structure”) according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a side view of the inner panel 101 at the sliding door on the left side of the vehicle as viewed from the outside of the vehicle. In the first embodiment, an example in which the vehicle door is a sliding door provided on the side of the vehicle body (not shown) and 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, may be referred to as “lower reinforcing member 10A”) is exemplified in the sliding door. One of the features of the reinforcing structure of the first embodiment is that the lower reinforcing member 10A includes a joint piece 30A having a welding point 31 as shown in FIGS. 2 and 3. Further, the bead portion 35 is provided between the root portion 33 (FIG. 2) and the welding point 31 of the joint piece 30A.

[Vehicle door]
First, the outline of the vehicle door to which the reinforcing structure of the first embodiment is applied will be described. The inner panel 101 shown in FIG. 1 is an inner panel constituting 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 panels are overlapped and joined so as to cover the outside of the vehicle (the front side of the paper surface in FIG. 1) of the inner panel 101. The 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 a metal plate such as a steel plate. The inner panel 101 and the outer panel are processed into a predetermined shape by press working or the like.

The sliding door is slidably supported in the front-rear direction with respect to the vehicle body by a sliding mechanism (not shown). A sliding mechanism is attached to the sliding door. The slide mechanism includes a roller bracket (not shown) that is fitted into a guide rail (not shown) provided on the side surface of the vehicle body along the front-rear direction and has a roller guided by the guide rail. Guide rails are usually provided at the top and bottom of the sides of the vehicle. The guide rail is also provided at the center of the side surface of the vehicle body in the vertical direction. 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 lower front side of the inner panel 101. The lower roller bracket has a roller guided by a lower guide rail provided at the lower part of the side surface of the vehicle body among the roller brackets constituting the slide mechanism. In the reinforcing structure of the first embodiment, the lower reinforcing member 10A is provided at the lower front side of the inner panel 101 to which the lower roller bracket is attached. The lower reinforcing member 10A ensures the rigidity of the mounting portion of the lower roller bracket on the inner panel 101.

Hereinafter, the configuration of the first reinforcing member (lower reinforcing member) 10A provided in the reinforcing structure of the first embodiment will be described in detail.

(Lower reinforcement member)
As shown in FIG. 1, the lower reinforcing member 10A is provided at the lower front side of the inner panel 101, and is joined to the outer surface of the vehicle of the inner panel 101. 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 outer surface of the inner panel 101 of the vehicle (see also FIG. 2).

(Main body, joint piece)
The lower reinforcing member 10A includes a main body portion 20A and a joint piece 30A extending from the main body portion 20A along the inner panel 101. The main body portion 20A forms the main portion of the reinforcing member 10A, and is a portion provided so as to substantially face the reinforcement target region in the inner panel. The area to be reinforced typically includes a portion to which parts such as a roller bracket and a locking device (see the second embodiment described later) are attached. The joint piece 30A is a portion of the reinforcing member 10A that is provided so as to project from the main body portion 20A and is smaller than the main body portion 20A. The joint piece 30A has a welding point 31 (FIG. 2) described later. The main body portion 20A shown in FIG. 1 is provided at the mounting portion of the lower roller bracket on the inner panel 101. In this example, the main body 20A is arranged at the corner of the inner panel 101 at the lower front side. The joint piece 30A is provided so as to extend rearward from the main body portion 20A along the lower end of the inner panel 101. The joint piece 30A is formed in a band shape.

As shown in FIG. 1, the main body 20A has a mounting hole 25. The mounting hole 25 is a through hole through which a bolt (not shown) for mounting the lower roller bracket is inserted into the inner panel 101. A mounting hole that penetrates the inner panel 101 is formed in the mounting portion of the lower roller bracket on the inner panel 101. The lower roller bracket is fixed to the inner surface of the inner panel 101 on the inside of the vehicle (the back side of the paper surface in FIG. 1) by a bolt. The lower roller bracket is attached to the inner panel 101, for example, as follows. The lower roller bracket is arranged on the inner surface of the inner panel 101 on the inner side of the vehicle, and the bolt is inserted into the bolt hole formed at the base of the lower roller bracket from the inside of the vehicle. Insert the inserted bolt into the mounting hole of the inner panel and the mounting hole 25 of the main body 20A, and tighten the nut (not shown) to 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, the main body portion 20A has a welding point 21 to be welded to the inner panel 101 (FIG. 1). In this example, the main body 20A has a plurality of welding points 21. The black circles in FIGS. 2 and 3 virtually indicate the welding points of spot welding.

As shown in FIG. 2, the joint piece 30A 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 joint piece 30A.

(Bead part)
The joint piece 30A has a bead portion 35 between the root portion 33 connected to the main body portion 20A and the welding point 31 (see also FIG. 3). The bead portion 35 is provided so as to project to the outside 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 be convex to the outside of the vehicle. In this example, as shown in FIG. 3, the joint piece 30A is bent in a U shape so that the internal space of the bead portion 35 is formed in a quadrangular shape when the joint piece 30A is viewed from the upper surface. The bead portion 35 may be a joint piece 30A bent 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 the upper surface. In addition, in this example, one bead portion 35 is provided on the joint piece 30A, but it is also possible to provide a plurality of bead portions 35.

(Movement of inner panel and joint piece when opening and closing the door)
In the reinforcing structure of the first embodiment, the movement of the inner panel 101 and the joint piece 30A when the sliding door is opened and closed will be described with reference to FIG. FIG. 4 is a partial cross-sectional view of the joint piece 30A shown in FIG. 3 in which the vicinity of the welding point 31 is cut along the IV-IV line. 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 vibrates when the sliding door is opened and closed, so that the inner panel 101 moves away from the joint piece 30A.

In the initial state, as shown in FIG. 4A, the joint piece 30A is arranged along the vehicle outer surface of the inner panel 101. More specifically, both sides of the joining piece 30A sandwiching the bead portion 35 face each other along the inner panel 101. In the initial state, since no external force is applied to the sliding door, the inner panel 101 and the joint piece 30A are 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 vibrates in and out of the vehicle, and the inner panel 101 and the joint piece 30A may move apart from each other. 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. 4 (B). 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 extend following the deformation of the inner panel 101. That is, the bead portion 35 functions as an extension allowance within the range of elastic deformation. Therefore, since the force with which the inner panel 101 is pulled by the joint piece 30A becomes small, 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.

Further, in this example, the width of the joint piece 30A (the vertical dimension in FIG. 2) is smaller than the width of the main body portion 20A (FIG. 2). Therefore, the joint piece 30A easily follows 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. Further, since the width of the joint piece 30A is formed to be narrow, the material can be reduced by that amount, so that the weight can be reduced.

A case of a comparative example in which the bead portion 35 (FIG. 3) is not provided on the joint piece 30A as shown in FIG. 5 will be described with respect to the reinforcing structure of the first embodiment. The reinforcing structure according to the comparative example shown in FIG. 5 is the same as the configuration of the first embodiment shown in FIG. 3, except that the joint piece 30A does not have the bead portion 35. The movement of the inner panel 101 and the joint piece 30A when the sliding door is opened and closed will be described with reference to FIG. FIG. 6 is a partial cross-sectional view of the joint piece 30A shown in FIG. 5 in which the vicinity of the welding point 31 is cut along the VI-VI line. 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 vibrates when the sliding door is opened and closed, so that the inner panel 101 moves away from the joint piece 30A.

Also in the case of the comparative example, when the inner panel 101 moves away from the joint piece 30A when the sliding door is opened and closed, as shown in FIG. 6B, at the welding point 31 where the joint piece 30A is joined. , The inner panel 101 is pulled and elastically deformed. In the comparative example, unlike the first embodiment, the joint piece 30A does not have the bead portion 35. That is, even if the inner panel 101 behaves so as to be separated from the joint piece 30A, the joint piece 30A in the comparative example does not have an elongation margin that is deformed according to the behavior. Therefore, as compared with the case of the first embodiment, the force that the inner panel 101 is pulled by the joint piece 30A is larger, so that the stress acting in the direction in which the inner panel 101 and the joint piece 30A are separated at the welding point 31 is increased. To rise.

<Verification example>
The stress in the peeling direction acting on the welding point at the time of opening and closing was analyzed by CAE (Computer Aided Engineering) for each of the sliding doors to which the reinforcing structure of the first embodiment and the reinforcing structure of the comparative example were applied. By stress analysis, the maximum stress in the peeling direction acting on the welding point 31 in the joint piece 30A was obtained. As a result, in the reinforcing structure of the first embodiment, the maximum stress could be reduced by about 14.5% as compared with the reinforcing structure of the comparative example.

(Other)
As another configuration of the lower reinforcing member 10A shown in FIG. 2, as shown in FIG. 3, an inclined surface 40 having a downward slope toward the bead portion 35 is formed on the upper surface of the joint piece 30A. Specifically, when the joint piece 30A is viewed from the outer surface of the vehicle, the upper sides of the portions located on both sides of the bead portion 35 are inclined in a valley shape toward the bead portion 35. The 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 electrodeposited with the lower reinforcing member 10A joined. In the electrodeposition coating, the inner panel 101 is immersed in the electrodeposition paint to electrodeposit the paint, and then the inner panel 101 is pulled up to heat and cure the paint. 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 the inside of the bead portion 35. It flows down through the space. Therefore, the electrodeposition paint is unlikely to collect on the upper surface of the joint piece 30A.

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

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. 7 to 9. .. FIG. 7 is a perspective view of the inner panel 102 at the sliding door on the right side of the vehicle as viewed from the inside of the vehicle.

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

(Center reinforcement member)
As shown in FIG. 7, the center reinforcing member 10B is provided at the central portion in the vertical direction on the rear side of the inner panel 102. The center reinforcing member 10B is joined to the surface of the inner panel 102 on the outside of the vehicle (the 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 outer surface of the inner panel 102 of the vehicle (see also FIG. 8).

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

As shown in FIG. 7, the main body 20B has a mounting hole 26. The mounting hole 26 is a through hole through which a bolt (not shown) for mounting the center roller bracket is inserted into the inner panel 102. A mounting hole penetrating the inner panel 102 is formed in the mounting portion of the center roller bracket on the inner panel 102. The center roller bracket is fixed to the inner surface of the inner panel 102 on the inside of the vehicle (the front side of the paper in FIG. 7) by a bolt.

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

The joint piece 30B has a welding point 31 to be 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 joint piece 30B.

(Bead part)
The joint piece 30B has a bead portion 35 between the root portion 33 connected to the main body portion 20B and the welding point 31. The bead portion 35 is provided so as to project to the outside of the vehicle. In this example, the bead portion 35 is formed by bending the joint piece 30B into a U shape as shown in FIG. The bead portion 35 may be a joint piece 30B bent in a V shape. In addition, in this example, one bead portion 35 is provided on the joint piece 30B, but it is also possible to provide a plurality of bead portions 35.

As another configuration of the center reinforcing member 10B shown in FIG. 8, an inclined surface having a downward slope toward the bead portion 35 may be formed on the upper surface of the joint piece 30B. Specifically, when the joint piece 30B is viewed from the outer surface of the vehicle, the upper sides of the portions located on both sides of the bead portion 35 are inclined in a valley shape toward the bead portion 35. 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 collect on the upper surface of the joint piece 30B. .. This is because the electrodeposition paint remaining on the upper surface of the joint piece 30B flows along the inclined surface toward the bead portion 35 and flows down through the internal space of the bead portion 35.

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

(Main body, joint piece)
The lock portion reinforcing member 10C includes a main body portion 20C and a joint piece 30C extending from the main body portion 20C along the inner panel 102. The main body 20C is provided at the attachment portion of the lock device on the inner panel 102. In this example, the main body 20C is arranged at the rear end of the inner panel 102. The joining piece 30C is provided along the peripheral edge of the inner panel 102 from the main body portion 20C.

As shown in FIG. 7, the main body 20C has a mounting hole 27. The mounting hole 27 is a through hole through which a bolt (not shown) for mounting a locking device is inserted into the inner panel 102. A mounting hole penetrating the inner panel 102 is formed in the mounting portion of the lock device on the inner panel 102. The lock device is fixed to the outer surface of the vehicle of the main body 20C by a bolt.

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

As shown in FIG. 9, the joint piece 30C 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 joint piece 30C.

(Bead part)
The joint piece 30C has a bead portion 35 between the root portion 33 connected to the main body portion 20C and the welding point 31. The bead portion 35 is provided so as to project to the outside of the vehicle. In this example, the bead portion 35 is formed by bending the joint piece 30C into a U shape as shown in FIG. The bead portion 35 may be a joint piece 30C bent in a V shape. In addition, in this example, one bead portion 35 is provided on the joint piece 30C, but it is also possible to provide a plurality of bead portions 35.

As another configuration of the lock portion reinforcing member 10C shown in FIG. 9, an inclined surface having a downward slope toward the bead portion 35 may be formed on the upper surface of the joint piece 30C. Specifically, when the joint piece 30B is viewed from the outer surface of the vehicle, the upper sides of the portions located on both sides of the bead portion 35 are inclined in a valley shape toward the bead portion 35. 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 collect 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 30C flows along the inclined surface toward the bead portion 35 and flows down through the internal space of the bead portion 35.

[Embodiment 3]
In the first and second embodiments, the reinforcing structure in the sliding door has been described. The vehicle door to which the reinforcing structure according to the embodiment of the present invention is applied is not limited to the sliding door. In the third embodiment, an example applied to a back door provided at the rear of the vehicle body will be described. In the third embodiment, as shown in FIG. 10, a reinforcing structure including a fourth reinforcing member 10D (hereinafter, may be referred to as “lock portion reinforcing member 10D”) in the back door is illustrated.

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. 10 is a perspective view of the inner panel 103 constituting the back door as 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.

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

(Lock part reinforcement member)
As shown in FIG. 10, the lock portion reinforcing member 10D is provided at the lower part of the inner panel 103. The lock portion reinforcing member 10D is joined to the surface of the inner panel 103 on the outside of the vehicle (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 outer surface of the inner panel 103 of the vehicle (see also FIG. 11).

(Main body, joint piece)
The lock portion reinforcing member 10D includes a main body portion 20D and a joint piece 30D extending from the main body portion 20D along the inner panel 103. The main body 20D is provided at the attachment portion of the lock device on the inner panel 103. In this example, the main body 20D is arranged at the bottom of the inner panel 103. The joining piece 30D is provided along the peripheral edge of the inner panel 103 from the main body portion 20D.

The main body 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 a locking device is inserted into the inner panel 103. A mounting hole that penetrates the inner panel 103 is formed in the mounting portion of the lock device on the inner panel 103. The lock device is fixed to the outer surface (specifically, the upper side) of the main body 20D by a bolt.

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

The joint piece 30D has a weld 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 joint piece 30D.

(Bead part)
The joint piece 30D has a bead portion 35 between the root portion 33 connected to the main body portion 20D and the welding point 31. The bead portion 35 is provided so as to project to the outside of the vehicle. In this example, the bead portion 35 is formed by bending the joint piece 30D into a U shape as shown in FIG. The bead portion 35 may be a joint piece 30D bent in a V shape. In addition, in this example, one bead portion 35 is provided on the joint piece 30D, but it is also possible to provide a plurality of bead portions 35.

<Action effect>
The vehicle door reinforcing structure according to the first to third embodiments includes a reinforcing 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 of the reinforcing member at the mounting portion of the component on the inner panel. Further, the reinforcing member includes a joint piece having a welding point, and the joint piece is provided with a bead portion. When the inner panel and the joint piece move apart due to vibration, such as when the door is opened or closed, the bead portion provided on the joint piece is deformed so as to follow 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 welding point can be reduced. Therefore, in the above-mentioned reinforcing structure, the stress in the peeling direction acting on the welding point in the joint piece can be reduced while ensuring the rigidity of the inner panel by the reinforcing member.

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

The reinforcing structure for vehicle doors 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 members 20A, 20B, 20C, 20D Main body 21 Welding points 25, 26, 27, 28 Mounting holes 30A, 30B, 30C, 30D Joint piece 31 Welding point 33 Root part 35 Bead part 40 Inclined surface

Claims (1)

It is a reinforcement structure for vehicle doors with inner panels and outer panels.
A reinforcing member to be joined to the outer surface of the vehicle of the inner panel is provided.
The reinforcing member includes a main body portion and a joint piece extending from the main body portion along the inner panel.
The joint piece has a weld point to be welded to the inner panel.
A reinforcing structure for a vehicle door in which a bead portion projecting to the outside of the vehicle is provided between a root portion connected to the main body portion of the joint piece and the welding point.

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