JP2004345507A - Reinforcing structure of door for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the intrusion of an occupant-side vehicle door to an indoor side in a side collision. <P>SOLUTION: A reinforcing structure of the door for a vehicle extends in the vertical direction in a space 25 so as to guide the vertical movement of a window pane 29 arranged in the space 25 of a door panel 21 and has a front sash 50 and a rear sash 60 formed with a specified clearance in the longitudinal direction and a door beam 70 arranged in the space 25 on the outside of these sashes and extending in the longitudinal direction. The door beam 70 has a bracket 71 connected to the front end 74a of a beam body 74. The front end 74a of the beam body 74 extends to a position crossing with the front sash 50 in a side view. The bracket 71 is deformed when it receives a specified force as its head end is connected to an inner panel 22. Rigidity in the side collision of a front side door panel in the front of the front sash 50 is lower than rigidity in the side collision of a rear side door panel in the rear of the front sash 50. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle door reinforcement structure, and more particularly, to a vehicle door reinforcement structure for reducing deformation of a door panel in a side collision.
[0002]
[Prior art]
Conventionally, a vehicle door disposed on the side of a vehicle includes a front and rear direction of the vehicle inside a door panel in order to prevent the door from being deformed by a collision load acting from the side of the vehicle body and entering the vehicle interior. There has been proposed a reinforcement structure for a vehicle door provided with a door beam extending to the vehicle. Further, in order to reduce the extent to which the door panel enters the vehicle interior, a reinforcement structure for a vehicle door provided with a reinforcement member extending in the vehicle longitudinal direction along the inner surface of the outer panel inside the window shoulder of the outer panel has also been proposed. (For example, see Patent Document 1). The reinforcing member is a plate-like member having a U-shaped cross section opened to the outer panel side, and is disposed within a window shoulder extending in the front-rear direction.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2001-33455 (page 4, FIG. 3)
[0004]
[Problems to be solved by the invention]
Here, in the case of a door panel having only a door beam, the front end of the vehicle door is connected to the vehicle body via a door hinge, and the rear end of the vehicle door is connected to the vehicle body via a door lock mechanism. When the door is closed, both ends of the vehicle door are fixedly supported. When a collision load acts on the vehicle door from the side of the vehicle door in this state, as shown in FIG. 9, the energy of the collision load is absorbed by the deformation of the entire door panel 90 toward the passenger compartment 3 and the occupant M There is a possibility that the door panel 90 beside the vehicle may greatly enter the vehicle interior 3. Therefore, if the rigidity of the door beam is further increased in order to reduce the amount of the door panel on the side of the occupant entering the vehicle interior, there is a disadvantage that the weight of the vehicle increases.
[0005]
In the case of a door panel provided with a reinforcing member in addition to the door beam, the reinforcing member is disposed within the range of the window shoulder extending in the front-rear direction. The door panel is bent at the front and rear positions, and as a result, there is a problem that the entry of the door panel beside the occupant into the passenger compartment cannot be suppressed.
[0006]
The present invention has been made in view of such a problem, and provides a vehicle door reinforcing structure capable of suppressing an amount of a vehicle door on the side of an occupant from entering a cabin during a side collision. With the goal.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to the present invention is directed to a door panel, which is provided with a predetermined gap in the front-rear direction extending vertically to guide the vertical movement of a window glass provided in the door panel. In the reinforcing structure of the vehicle door (for example, the rear door 11 and the front door 20 in the embodiment) having the front sash and the rear sash, the front door panel from the front sash (for example, the front door panel 21b in the embodiment) is provided. The rigidity at the time of a side collision of (1) is lower than the rigidity of a door panel (for example, the rear door panel 21a in the embodiment) behind the front sash at the time of a side collision.
[0008]
According to the vehicle door reinforcement structure having the above-described configuration, the rigidity of the front door panel on the front side from the front sash at the time of a side collision is made lower than the rigidity of the door panel on the rear side of the front sash at the time of a side collision. When a side impact load acts on the vehicle door from the side of the vehicle door, the energy of the impact load is first absorbed from the front sash by the deformation of the front door panel at the front, and the members constituting the front door panel Is dispersed and absorbed. For this reason, the energy of the side collision load absorbed by the door panel on the rear side of the front sash can be reduced, and as a result, the amount of deformation of the door panel on the rear side of the front sash toward the passenger compartment can be reduced. Can be.
[0009]
Further, the invention according to the present invention provides a door panel, a front sash extending in the vertical direction for guiding the vertical movement of the window glass provided in the door panel and disposed with a predetermined gap in the front-rear direction, and In a vehicle door reinforcing structure having a rear sash, a door beam extending in the front-rear direction is disposed in a door panel outside the front sash, and a front end of the door beam intersects the front sash in a side view. The stiffness of the front door beam from the front sash at the time of a side collision is lower than that of the door beam at the rear side of the front sash at the time of a side collision.
[0010]
According to the vehicle door reinforcing structure having the above configuration, the front end of the door beam is extended to a position intersecting the front sash in a side view, and the rigidity of the front door beam at the time of a side collision from the front sash is more rearward than the front sash. When a side collision load acts on the door panel by lowering the rigidity of the door beam at the time of a side collision, the force acts on the door beam and moves the front sash to the inner panel side via the door beam. Then, the front door panel from the front sash is deformed toward the passenger compartment, and the front door beam from the front sash is also deformed. Therefore, the energy of the side impact load is first absorbed by the deformation of the door beam and the deformation of the front door panel. Therefore, the energy of the collision load absorbed by the door panel on the rear side of the front sash can be reduced, and as a result, the amount of deformation of the rear door panel toward the passenger compartment can be reduced. In addition, when the front door beam is deformed from the front sash at the time of the side collision, the door panel can be positively deformed more efficiently on the front side of the occupant in the vehicle cabin.
[0011]
Further, the invention according to the present invention provides a door panel, a front sash extending in the vertical direction for guiding the vertical movement of the window glass provided in the door panel and disposed with a predetermined gap in the front-rear direction, and In a vehicle door reinforcing structure having a rear sash, a door beam extending in the front-rear direction is disposed in a door panel outside the front sash, and a front end of the door beam intersects the front sash in a side view. The rigidity of the door beam at the side collision from the front end of the door beam to the front side of the door beam is lower than the rigidity of the door beam at the rear side of the front end of the door beam at the side collision.
[0012]
According to the vehicle door reinforcement structure having the above-described configuration, the front end of the door beam is extended to a position intersecting the front sash in a side view, and the rigidity of the door beam at the side collision from the front end of the door beam to the front end of the door beam is increased. When a side collision load acts on the door panel by lowering the rigidity of the rear side door beam at the time of a side collision, the force acts on the door beam and moves the front sash to the inner panel side via the door beam. . Then, the front door beam from the front sash is deformed toward the passenger compartment, and the front end of the door beam is also deformed. Therefore, the energy of the side impact load is first absorbed by the deformation of the front end of the door beam and the deformation of the front door panel. Therefore, the energy of the collision load absorbed by the door panel on the rear side of the front sash can be reduced, and as a result, the amount of deformation of the rear door panel toward the passenger compartment can be reduced. Further, when the front end of the door beam is deformed at the time of a side collision, the door panel can be positively deformed more efficiently on the front side of the occupant in the vehicle cabin.
[0013]
In the reinforcing structure for a vehicle door having the above-described configuration, the front sash is attached to a sash attachment portion (for example, the attachment members 53 and 53 ′ in the embodiment) provided on the door panel, and the sash attachment portion is located on the vehicle interior side from the front sash. May be deformed toward the interior of the vehicle when a force having a magnitude directed toward the vehicle is received.
[0014]
According to the reinforcing structure for a vehicle door having the above configuration, the front sash is mounted on the sash mounting portion provided on the door panel, and the sash mounting portion receives the force of the size directed from the front sash toward the vehicle interior to the vehicle interior. When a force directed to the inner panel side acts on the door beam by this deformation, the force acts on the sash attachment portion via the door beam and the front sash, and deforms the sash attachment portion toward the inner panel side. For this reason, the door panel at the front position of the occupant in the passenger compartment can be more efficiently deformed.
[0015]
In the vehicle door reinforcing structure having the above-described structure, the door beam includes a beam body extending in the front-rear direction, and a bracket having one end connected to the front end of the beam body and the other end connected to the door panel. The front end of the beam body intersects with the front sash in side view and extends to a non-intersecting position on the rear side of the front pillar arranged on the front side of the door panel, and the rear end of the beam main body is behind the door panel in side view. You may make it extend to the position which intersects with the arrange | positioned center pillar.
[0016]
According to the vehicle door reinforcing structure having the above-described configuration, the door beam is formed to have the beam body and the bracket connected to the distal end portion of the beam body, so that the rigidity of the front end of the door beam is more than that of the beam body. Can also be lower. In addition, the front end of the beam body extends beyond the front sash in side view to the non-intersecting position behind the front pillar, and the rear end of the beam body extends to the position where it intersects the center pillar in side view. In this case, the front side of the beam main body can be moved to the front sash side with the position where the rear end of the beam main body abuts on the center pillar as a fulcrum, and the side collision load can be efficiently transmitted to the front sash. Therefore, the door panel can be more efficiently deformed at the front position of the occupant in the vehicle cabin.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. The present embodiment shows an aspect of a reinforcing structure of a front door provided on both sides of a front side of a passenger compartment of a vehicle.
[0018]
First, before describing a vehicle door reinforcing structure according to the present invention, an outline of a mounting structure of a front door having the reinforcing structure to a vehicle will be described. As shown in FIG. 1 (side view), the front door 20 is disposed in a front opening 5 which is formed at an intermediate portion in the front-rear direction of the vehicle body 1 and opens on both left and right sides in front of the vehicle compartment 3. The front door 20 is attached via a door hinge 8 to a front pillar 7 provided at the front of the front opening 5 and is swingable in the left-right direction of the vehicle. The pillar 9 can be locked via a lock mechanism (not shown).
[0019]
As shown in FIG. 2 (exploded perspective view), the front door 20 has a door panel 21 in which an inner panel 22 is disposed on the inside, an outer panel 23 is disposed on the outside, and a space portion 25 is formed therein. It has a door beam 70 disposed in the section 25. When the front door 20 is swung to the position where the front opening 5 shown in FIG. 1 is closed, the rear end of the door panel 21 intersects the front part of the center pillar 9 as shown in FIG. Placed in the position.
[0020]
Next, the reinforcing structure of the front door 20 according to the present invention will be described. The reinforcing structure includes a door beam 70 and a front sash 50 and a rear sash 60 disposed in the space 25 of the door panel 21.
[0021]
The front sash 50 and the rear sash 60 extend vertically in the space 25 of the door panel 21 and are disposed with a predetermined gap in the front-rear direction. The front sash 50 is arranged on the front side of the door panel 21 and has an upper side inclined toward the vehicle rear side, and is formed in an inverted U-shape as shown in FIG. The rear sash 60 is disposed on the rear side of the door panel 21 and has an upper side inclined toward the vehicle rear side, and is formed in a substantially inverted U-shape as shown in FIG.
[0022]
The upper end of the front sash 50 is fixed to the mounting surface 75a of the second reinforcing member 75 via the mounting member 53, as shown in FIG. The second reinforcing member 75 will be described later. The attachment member 53 is a plate-shaped member made of a metal material, and has a plurality of screw holes 54 arranged at predetermined intervals in the front-rear direction as shown in FIG. ing. A bolt 51 inserted through the mounting surface 75 a of the second reinforcing member 75 is screwed into the screw hole 54, and the mounting member 53 is fixed to the inner panel 22 via the second reinforcing member 75. The attachment member 53 extends downward as shown in FIG. 5 (b), and a front sash 50 is fixed to the tip of the attachment member 53 by welding or the like. For this reason, the mounting member 53 is in a cantilevered state, and when a predetermined magnitude of force from the front sash 50 toward the inner panel 22 acts on the lower side of the mounting member 53, the lower side of the mounting member 53 It bends and deforms to the inner panel 22 side. In the inner panel 22, a plurality of operation holes 24 that allow the bolt 51 to be attached from the inside are formed at predetermined intervals in the front-rear direction. FIG. 5A is a cross-sectional view of a part corresponding to the line III-III in FIG. 3, and FIG. 5B is a cross-sectional view of a part corresponding to the line VV in FIG. FIG.
[0023]
On the other hand, the lower end of the front sash 50 is connected to the inner panel 22 via a mounting member 53 'as shown in FIG. 6 (cross-sectional view). The mounting member 53 ′ extends in the front-rear direction, and its front side is screwed with a bolt 51 inserted through the inner panel 22 and fixed to the inner panel 22. For this reason, the attachment member 53 'is in a state of being cantilevered similarly to the attachment member 53 shown in FIG. 5B described above, and is directed from the front sash 50 to the inner panel 22 side at the tip end side of the attachment member 53'. When a predetermined amount of force is received, the distal end side of the mounting member 53 'is bent and deformed toward the inner panel 22 side. The front sash 50 is disposed such that its upper end position is located on the front side of the knees of the occupant M in the passenger compartment 3 shown in FIG. FIG. 6 is a cross-sectional view of a part corresponding to the view taken along the line III′-III ′ of FIG.
[0024]
The second reinforcing member 75 extends in the front-rear direction along the window shoulder 28 of the inner panel 22 shown in FIG. 2, and its front and rear ends extend to positions near the front and rear ends of the door panel 21. The second reinforcing member 75 has the above-described planar mounting surface 75a formed on the front side thereof. The second reinforcing member 75 enhances the rigidity of the door panel against a collision load such as an offset collision or a front collision.
[0025]
As shown in FIG. 3, the door beam 70 includes a beam body 74 extending in the front-rear direction, and a bracket 71 fixed to a front end of the beam body 74. The beam body 74 extends obliquely so that the front side is directed obliquely upward, and its front end 74a extends to a position intersecting with the front sash 50 in a side view, and from the front pillar 7 disposed on the front side of the door panel 21. Also extend to the rear non-intersecting position. The front end portion 74a only needs to extend to a position intersecting with the front sash 50, and may be disposed on substantially the same plane as the front surface 50a of the front sash 50, or may be disposed behind the front surface 50a. . The bracket 71 is welded to the front end 74a of the beam main body 74 and extends forward, and the front end is welded to a connecting member 73 welded to the inner panel 22 shown in FIG. The bracket 71 is made of sheet metal extending in the front-rear direction, and supports the front end 74a of the beam main body 74, and can be easily deformed toward the passenger compartment 3 at the time of a side collision. The rear end portion 74b of the beam main body 74 extends to a position crossing the center pillar 9 in a side view, and is fixed to the lower portion of the rear end of the inner panel 22 by a welding means or the like via a bracket 72 shown in FIG. For this reason, when a collision load (hereinafter, referred to as “side collision load”) acts from the side of the front door 20, the beam main body 74 is supported by the position where the rear end of the beam main body 74 abuts the center pillar 9. The front side moves to the front sash 50 side. The front sash 50, the rear sash 60, and the beam main body 74 are made of a metal material.
[0026]
In this manner, by extending the front end portion 74a of the beam main body 74 to a position intersecting the front sash 50 in a side view, as shown in FIG. 4, a front vehicle front door panel from the front sash 50 (hereinafter, “front door panel”). 21b ") at the time of a side collision is lower than the rigidity of a door panel behind the front sash 50 (hereinafter, referred to as a" rear door panel 21a ") at the time of a side collision.
[0027]
Next, with respect to the operation of the vehicle door reinforcing structure according to the present invention, a case where a side impact load F having a left-right component from the side of the front door 20 acts on the front door 20 will be described. When the side collision load F acts on the front door 20, the side collision load F presses and deforms the outer panel 23 of the front door 20 toward the passenger compartment 3.
[0028]
Here, the rear door panel 21a of the front door 20 has enhanced rigidity at the time of a side collision, and when the front door 20 closes the front opening 5 shown in FIG. 1, the front side of the front door 20 is shown in FIG. The front door 20 is connected by a door hinge 8 and the rear side is connected by a lock mechanism, and both ends of the front door 20 are fixedly supported. When a side impact load F acts on the front door 20 in such a state, the force F acts on the door beam 70 via the outer panel 23. Then, the bracket 71 of the door beam 70 is deformed by the force applied to the door beam 70, and the door beam 70 presses the front sash 50 toward the inner panel 22. The force applied to the front sash 50 presses the mounting member 53 shown in FIG. 5B and deforms it toward the inner panel 22. Then, the force received by the mounting member 53 presses the mounting surface 75a of the second reinforcing member 75 to deform it. 6 is also deformed toward the inner panel 22 by the force received from the front sash 50. As a result, the side surface of the front sash 50 extending in the vertical direction presses the inner panel 22 via the attachment members 53 and 53 '.
[0029]
For this reason, the inner panel 22 is pressed over a wide range by the side surface of the front sash 50. As a result, as shown in FIG. 3, a portion (hereinafter, referred to as “fragile portion 35”) of the front door panel 21 b extending in the front-rear direction along the front sash 50 on the front side of the front sash 50 is bent toward the vehicle compartment 3. I do. The fragile portion 35 may be a region including the front sash 50 in a side view. As a result, the energy of the side collision load F is absorbed by the deformation of the fragile portion 35 and other members (the first reinforcing member 40, the second reinforcing member 75, and the third reinforcing member shown in FIG. The member 80 and the like are dispersed and absorbed. Then, the energy of the side impact load F that is not absorbed in the vicinity of the fragile portion 35 is absorbed by deforming the rear door panel 21a shown in FIG. The first reinforcing member 40 and the third reinforcing member 80 will be described later.
[0030]
That is, since the reinforcing structure of the vehicle door according to the present invention first actively absorbs the energy of the side collision load F around the weak portion 35, the side collision load F absorbed by the rear door panel 21a shown in FIG. Energy can be reduced. As a result, as shown in FIG. 8, the amount of deformation of the rear door panel 21a toward the passenger compartment 3 can be reduced, and the amount of entry of the door panel 21 toward the occupant M in the passenger compartment 3 can be suppressed. be able to. Further, in the vehicle door reinforcing structure according to the present invention, the mounting members 53 and 53 ′ shown in FIGS. 5B and 6 and the bracket 71 shown in FIG. It is possible to more efficiently deform the door panel 21 at the front position of the occupant riding inside.
[0031]
As shown in FIG. 2, a first reinforcing member 40 extending in the vehicle longitudinal direction may be provided on the window shoulder 27 of the outer panel 23. The front end portion 40a of the first reinforcing member 40 extends to a position crossing the front sash 50 shown in FIG. However, the front end portion 40a only needs to intersect the front sash 50 in a side view, and the front end portion 40a is disposed substantially on the same plane as the front surface 50a of the front sash 50 shown in FIG. It may be arranged on the side. By providing the first reinforcing member 40, when a side impact load acts on the front door 20, the first reinforcing member 40 is pressed toward the inner panel 22 by the side impact load, and the front end of the first reinforcing member 40. 40a comes into contact with the front sash 50 shown in FIG. Therefore, the amount of the side impact load transmitted to the front sash 50 can be further increased. Therefore, the door panel 21 at the front position of the occupant M in the passenger compartment 3 shown in FIG. 4 can be more efficiently deformed.
[0032]
Further, a third reinforcing member 80 may be provided between the second reinforcing member 75 and the first reinforcing member 40 described above. The third reinforcing member 80 has a hole 81 extending in the front-rear direction at an intermediate portion in the left-right direction, and the window glass 29 shown in FIG. The third reinforcing member 80 extends to positions near the front and rear ends of the door panel 21. The third reinforcing member 80 can enhance the rigidity in the vehicle longitudinal direction against a collision load such as an offset collision or a frontal collision.
[0033]
Thus, even when the first reinforcing member 40 and the third reinforcing member 80 are provided on the front door 20 having the reinforcing structure according to the present invention, when the side impact load acts on the front door 20, as shown in FIG. The front door 20 can be bent toward the passenger compartment 3 at the weak portion 35. Therefore, even when the vehicle has a front collision, an offset collision, or the like, the amount of entry of the door panel 21 into the side of the occupant can be suppressed.
[0034]
Further, in the above-described embodiment, an example in which the reinforcement structure is adopted for the front door 20 is shown. However, as shown in FIG. 1, the rear door 11 provided on both sides on the rear side of the cabin 3 of the vehicle is provided. The above-described reinforcing structure may be employed. In the above-described embodiment, an example is shown in which the front end 40a of the first reinforcing member 40 shown in FIG. 2 is extended to a position intersecting the front sash 50 shown in FIG. When the fragile portion 35 can be formed in the front door panel 21b on the front side of the front sash 50 only by extending to the position crossing the front sash 50, the front end portion 40a of the first reinforcing member 40 is connected to the front sash 50. You may arrange | position at the position which does not intersect.
[0035]
【The invention's effect】
As described above, according to the vehicle door reinforcement structure of the present invention, the rigidity of the front door panel from the front sash at the time of a side collision is reduced by the rigidity at the time of a side collision of the door panel at the rear side of the front sash. By making the height lower than that, the energy of the side impact load acting on the vehicle door can be absorbed by the deformation of the front door panel on the front side from the front sash. For this reason, the energy of the side collision load absorbed by the door panel on the rear side of the front sash can be reduced, and as a result, the amount of deformation of the door panel on the rear side of the front sash toward the passenger compartment can be reduced. Can be.
[0036]
According to the vehicle door reinforcement structure of the present invention, the front end of the door beam is extended to a position intersecting the front sash in a side view, and the rigidity of the front door beam at the time of a side collision from the front sash is smaller than that of the front sash. Also, by lowering the rigidity of the rear door beam at the time of the side collision, the energy of the side collision load applied to the door panel can be absorbed from the front sash by the deformation of the front door panel and the deformation of the door beam. Therefore, the energy of the collision load absorbed by the door panel on the rear side of the front sash can be reduced, and as a result, the amount of deformation of the rear door panel toward the passenger compartment can be reduced. In addition, when the front door beam is deformed from the front sash at the time of the side collision, the door panel can be positively deformed more efficiently on the front side of the occupant in the vehicle cabin.
[0037]
Further, according to the vehicle door reinforcing structure of the present invention, the front end of the door beam is extended to a position intersecting with the front sash in a side view, and the rigidity of the door beam at the time of a side collision from the front end of the door beam is reduced. The energy of the side collision load acting on the door panel is absorbed by the deformation of the front panel from the front sash and the deformation of the front end of the door beam by lowering the rigidity of the door beam on the rear side than the front end of the front panel at the time of side collision. Can be done. Therefore, the energy of the collision load absorbed by the door panel on the rear side of the front sash can be reduced, and as a result, the amount of deformation of the rear door panel toward the passenger compartment can be reduced. Further, when the front end of the door beam is deformed at the time of a side collision, the door panel can be positively deformed more efficiently on the front side of the occupant in the vehicle cabin.
[Brief description of the drawings]
FIG. 1 is a side view of a vehicle provided with a front door having a vehicle door reinforcing structure according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the front door.
FIG. 3 shows an internal side view of the front door.
FIG. 4 is a schematic plan view of the front door.
5A and 5B show an upper mounting structure of the front sash. FIG. 5A is a cross-sectional view of a portion corresponding to a view taken along the line III-III of FIG. 3, and FIG. It is sectional drawing of the part corresponding to -V arrow view.
FIG. 6 is a cross-sectional view illustrating a lower mounting structure of the front sash at a portion corresponding to a section taken along line III′-III ′ of FIG.
FIG. 7 is a cross-sectional view of a portion of the front door corresponding to a section taken along the line II in FIG. 1;
FIG. 8 is a schematic plan view showing a deformation of a front door having a reinforcing structure according to the present invention.
FIG. 9 is a schematic plan view showing a modification of a conventional front door.
[Explanation of symbols]
11 Rear door (vehicle door)
20 Front door (vehicle door)
21 Door panel 29 Window glass 50 Front sash 53, 53 'Mounting member (sash mounting portion)
60 Rear sash 70 Door beam 71 Bracket 74 Beam body 74a Front end

Claims (5)

A vehicle having a door panel and a front sash and a rear sash that extend in the vertical direction for guiding the vertical movement of the window glass provided in the door panel and are disposed with a predetermined gap in the front-rear direction. In the door reinforcement structure,
The rigidity of a front door panel in front of the front sash at the time of a side collision is lower than the rigidity of the door panel behind the front sash at the time of a side collision. A vehicle having a door panel and a front sash and a rear sash that extend in the vertical direction for guiding the vertical movement of the window glass provided in the door panel and are disposed with a predetermined gap in the front-rear direction. In the door reinforcement structure,
Arranging a door beam extending in the front-rear direction in the door panel outside the front sash,
The front end of the door beam extends to a position crossing the front sash in side view,
A stiffness at the time of a side collision of a door beam on the front side from the front sash is lower than a stiffness at a side collision of a door beam on the rear side of the front sash. A vehicle having a door panel and a front sash and a rear sash that extend in the vertical direction for guiding the vertical movement of the window glass provided in the door panel and are disposed with a predetermined gap in the front-rear direction. In the door reinforcement structure,
Arranging a door beam extending in the front-rear direction in the door panel outside the front sash,
The front end of the door beam extends to a position crossing the front sash in side view,
A stiffness at the time of a side collision of a door beam on the front side from a front end of the door beam is lower than a stiffness at a side collision of a door beam at a rear side of the front end of the door beam. The front sash is attached to a sash attachment portion provided on the door panel,
4. The vehicle door reinforcing structure according to claim 2, wherein the sash mounting portion is deformed toward the vehicle compartment when receiving a force having a magnitude directed from the front sash toward the vehicle compartment. 5. The door beam has a beam body extending in the front-rear direction, and a bracket having one end connected to the front end of the beam body and the other end connected to the door panel,
The front end of the beam main body intersects with the front sash in a side view, and extends to a non-intersecting position on the rear side of a front pillar disposed on the front side of the door panel,
5. The vehicle door according to claim 2, wherein a rear end of the beam main body extends to a position crossing a center pillar disposed on a rear side of the door panel in a side view. 6. Reinforcement structure.

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