JP2024008332A - Vehicular door structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular door structure which can prevent stress from being concentrated at only one part of a collided section, when a load of collision from a side surface acts on a door beam, and which can avoid large deformation locally at a specific section of the door beam, by employing a comparatively simple constitution.

SOLUTION: A vehicular door structure comprises: an inner panel (20) positioned on the inside in a vehicle width direction of a vehicle; an outer panel (30) positioned on the outside in the vehicle width direction relative to the inner panel (20); and a door beam (40) provided between the inner panel (20) and the outer panel (30) in the vehicle width direction. A plurality of places that are continuous along a longer direction of the door beam (40) are provided with easily deformed portions (57) which are more easily deformed by external force as compared with other parts of the door beam (40). The easily deformed portions (57) are trough parts made by depressing inward in the vehicle width direction a surface on the outside in the vehicle width direction at a stiffener (53) of the door beam (40).

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a vehicle door structure.

For example, Patent Document 1 discloses that a door beam is provided inside a door of a vehicle, and the door beam is formed into an arch shape (curved shape) in which the longitudinal center of the door beam is convex outward in the vehicle width direction. .

In the conventional structure described in Patent Document 1, the door beam is formed in an arch shape, so that the arch portion of the door beam can support the load due to a collision from the side of the vehicle (side collision). Therefore, the collision resistance can be improved compared to a straight door beam.

Japanese Patent Application Publication No. 2005-138660

By the way, as a mode of collision from the side of the vehicle, for example, a door collides with a cylindrical object such as a pole erected on the side of a roadway. In that case, the door beam cannot sufficiently follow the surface shape (arc-shaped curved surface shape) of the cylindrical object, and only one part of the impact position of the object buckles, causing stress to concentrate in that part, causing the door beam to There was a risk that a specific part of the body would be locally significantly deformed (distorted).

The present invention has been made in view of the above problems, and although it has a relatively simple configuration, when the load of a side collision is applied to the door beam, stress is concentrated only at one location of the collision site. The purpose of the present invention is to provide a vehicle door structure that can prevent large local deformation of specific parts of the door beam. The purpose is to suppress sexual decline.

In order to solve the above problems, the vehicle door structure according to the present invention includes an inner panel (20) located on the inside in the vehicle width direction of the vehicle, and an inner panel (20) located on the outside in the vehicle width direction with respect to the inner panel (20). It includes an outer panel (30) and a door beam (40) provided between the inner panel (20) and the outer panel (30) in the vehicle width direction, and at a plurality of locations that are continuous along the longitudinal direction of the door beam (40). The door beam (40) is characterized by being provided with an easily deformable portion (57) that can be easily deformed by external force compared to other portions.

According to the vehicle door structure according to the present invention, easily deformable parts that are easily deformed by external force compared to other parts of the door beam are provided at a plurality of locations that are continuous along the longitudinal direction of the door beam. , multiple easily deformable parts become deformed when there is a side collision with the door. Thereby, it is possible to prevent large local deformation of only the portion of the door beam where the object collides with the door beam. Therefore, the amount of inward deformation (displacement) of the door beam in the vehicle width direction can be suppressed, and the amount of intrusion of the inner panel into the passenger compartment can be suppressed, thereby improving the safety of the vehicle.

Further, in this vehicle door structure, the easily deformable portion (57) is a valley portion (57) formed by recessing the outer surface of the door beam (40) in the vehicle width direction toward the inner side in the vehicle width direction. good.

According to this configuration, the easily deformable portion is a trough formed by recessing the outside surface of the door beam in the vehicle width direction toward the inside in the vehicle width direction, so that multiple easily deformable portions are formed when a side collision occurs with the door. It is possible to easily and reliably deform the easily deformable portions at certain locations, and the easily deformable portions can be formed in accordance with the press molding of the door beam, so the manufacturing process of the door beam can be simplified. Vehicle productivity can be improved.

In addition, in this vehicle door structure, the door beam (40) includes an outer member (51) located on the outer side in the vehicle width direction, and a stiffener (53) located on the inner side in the vehicle width direction than the outer member (51). , and the easily deformable portion (57) may be formed in the stiffener (53).

According to this configuration, an easily deformable part (trough) is formed in the stiffener, which is different from the outer member that comes into contact with the collision object for the first time, so that the collision load is mainly absorbed when the door is collided from the side. The stiffener can improve the ability of the door beam to follow the deformation of the door beam against the collision load without significantly reducing the reaction force (resistance against the collision load) exerted by the outer parts on the door beam.

Further, in this vehicle door structure, the stiffener (53) may have a shape in which the upper surface (53b) and the lower surface (53c) respectively widen upward and downward as they go from the outside to the inside in the vehicle width direction.

According to this configuration, the top and bottom surfaces of the stiffener are easily deformed by the load caused by a side collision with the door, so that the ability of the door beam to follow the deformation of the door beam against the load caused by the collision can be further improved. Moreover, according to this configuration, it becomes easy to form the valley portion, which is an easily deformable portion, during press molding of the stiffener, so that the moldability of the door beam is improved.

In addition, in this vehicle door structure, the door beam (40) has an outer surface (51a) facing outward in the vehicle width direction, and inner and outer surfaces (51b, 51c) extending from the outer surface (51a) inward in the vehicle width direction. The distance (L) between the plurality of easily deformable parts (57) is determined by the length dimension (Bb) in the vertical direction of the outer surface (51a) and the length dimension (Bh) in the vehicle width direction of the inner and outer surfaces (51b, 51c). The length may be 1/2 or less of the combined length.

According to this configuration, the interval between the plurality of easily deformable parts is equal to or less than 1/2 of the length of the outer surface in the vertical direction and the length of the inner and outer surfaces in the vehicle width direction. This allows the spacing between multiple easily deformable parts to be less than the buckling wavelength of the door beam, making it possible to buckle the door beam with a lower load when the load from a side collision is input to the door. . Therefore, it becomes possible to easily and reliably deform more easily deformable parts among the plurality of easily deformable parts provided in the door beam.

Further, in the door structure of this vehicle, the door beam (40) has a longitudinal center (40c) that is lower than one end (40a) and the other end (40b) attached to the inner panel (20). It has an arch shape that bulges outward in the vehicle width direction, and the easily deformable portion (57) is provided at or near a position (40c) that bulges outward in the vehicle width direction in the longitudinal direction of the door beam (40). It's good to be able to do it.

According to this configuration, in the case of a side collision with the door, the position where the door beam bulges outward in the vehicle width direction in the longitudinal direction is likely to receive the load due to the collision of an external object; By providing the easily deformable portion, it is possible to more effectively prevent only the portion of the door beam collided with the object from being locally significantly deformed.

Note that the symbols in parentheses above indicate drawing reference numbers of corresponding components in the embodiments to be described later for reference.

According to the vehicle door structure according to the present invention, when a collision load is applied to the door beam with a simple configuration, the strength of the door beam against the load can be effectively increased, and as a result, it is possible to effectively improve the strength of the door beam against the load. It is possible to suppress deterioration in traffic smoothness while improving safety.

1 is a diagram showing a part of a side surface of a vehicle body to which a vehicle door structure according to an embodiment of the present invention is applied; FIG. 2 is a diagram showing a cross section taken along the line XX in FIG. 1. FIG. 2 is a diagram showing a cross section taken along the YY arrow in FIG. 1. FIG. FIG. 3 is a perspective view showing a plurality of valleys provided in the stiffener. It is a schematic diagram for explaining the dimension setting of a door beam.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that in the following description, the front or rear refers to the front side, which is the forward direction of the vehicle body (vehicle), or the rear side, which is the backward direction, of the vehicle body (vehicle), which will be described later. Furthermore, when referring to left and right, they refer to the left and right in the vehicle width direction, respectively, when facing the forward direction (front side) of the vehicle body (vehicle). Moreover, when referring to "up" or "down", it refers to the up-down direction (vertical up-down direction) of the vehicle body (vehicle).

FIG. 1 is a diagram showing a part of a side surface of a vehicle body to which a vehicle door structure according to an embodiment of the present invention is applied, and FIG. 2 is a diagram showing a cross section taken along the line XX in FIG. 3 is a diagram showing a cross section taken along YY arrow in FIG. As shown in these figures, a vehicle to which a door structure according to an embodiment of the present invention is applied includes a side door 14 provided on a vehicle body 10. The side door 14 includes a front door 14A and a rear door 14B. Further, the vehicle body 10 is provided with a door opening 16 into which a side door 14 is attached so as to be openable and closable. The door opening 16 includes a front door opening 16A and a rear door opening 16B. Further, in front of the front door opening 16A in the vehicle body 10, a front pillar (member on the vehicle body side) 17 extending substantially in the vertical direction is provided, and on the rear side of the front door opening 16A, a front pillar (member on the vehicle body side) is provided. A center pillar (member on the vehicle body side) 18 is provided that extends in the vertical direction. In the following description, only the front door 14A and the front door opening 16A of the side door 14 and the door opening 16 will be described, and the explanation of the rear door 14B and the rear door opening 16B will be omitted.

The front door 14A includes a door body 14a that opens and closes a front door opening 16A. As shown in FIG. 2, the door body 14a of the front door 14A includes an inner panel 20 provided on the inside in the vehicle width direction (indoor side) and an inner panel 20 provided on the outside in the vehicle width direction (outdoor side) with respect to the inner panel 20. The door beam 40 is provided between the inner panel 20 and the outer panel 30 in the vehicle width direction. The inner panel 20 and the outer panel 30 are plate-shaped metal members, and the door beam 40 is a long metal member.

In the door structure of the present embodiment, the inner panel 20 includes an inner wall (first wall) 21 that extends in the longitudinal direction of the vehicle body 10 on the inner side in the vehicle width direction, and a connection wall that extends from the inner wall 21 to the outer side in the vehicle width direction. (second wall) 22, and an outer wall (third wall) 23 that extends in the longitudinal direction of the vehicle body 10 from the outer end of the connection wall 22 in the vehicle width direction and joins to the outer panel 30.

The door beam 40 is disposed within the door body 14a of the front door 14A and extends along the front-rear direction of the vehicle body 10. The door beam 40 has an arch shape in which a central portion 40c in the longitudinal direction bulges outward in the vehicle width direction from the front end 40a and the rear end 40b. The door beam 40 is an elongated member whose cross section (the cross section of an outer member 51 and a stiffener 53 to be described later) is approximately U-shaped and has a convex outward in the vehicle width direction, and has a front end portion 40a and a U-shape. The rear end portion 40b is a fixed portion fixed to the inner panel 20, and the vicinity of the front end portion 40a and the rear end portion 40b is a front curved portion 41a and a rear curved portion 41b that curve toward the outside in the vehicle width direction, respectively. As a result, the central portion 40c in the longitudinal direction bulges outward in the vehicle width direction.

The front end 40a of the door beam 40 is fixed to the inner wall 21 of the inner panel 20. Further, the portion of the inner panel 20 to which the front end portion 40a of the door beam 40 is fixed faces the front pillar 17 located on the inside in the vehicle width direction.

The rear end portion 40b of the door beam 40 is fixed to the inner wall 21 of the inner panel 20. Further, the portion of the inner panel 20 to which the rear end portion 40b of the door beam 40 is fixed faces the center pillar 18 (specifically, near the lower end portion of the center pillar 18) on the inside in the vehicle width direction. .

Further, as shown in FIG. 3, the door beam 40 includes an outer member 51 located on the outer side in the vehicle width direction, a stiffener 53 located on the inner side in the vehicle width direction than the outer member 51, and a stiffener 53 arranged on the inner side of the stiffener 53. It is composed of a back plate 55. The outer member 51 includes an outer wall 51a that covers the outside of the stiffener 53 in the vehicle width direction, and an upper wall 51b and a lower wall 51c that cover the upper and lower sides of the stiffener 53, respectively, and has a substantially U-shaped cross section in the longitudinal direction. formed into a mold. The upper side wall (upper surface) 51b and the lower side wall (lower surface) 51c of the outer member 51 are planar surfaces extending substantially horizontally from the outside toward the inside in the vehicle width direction. On the other hand, the stiffener 53 has a substantially U-shaped (so-called hat-shaped) cross-sectional shape that is open on the inside in the vehicle width direction. It is formed into a flat plate that covers the open side of the letter. The stiffener 53 is disposed within a recessed portion of the outer member 51 that has a substantially U-shaped cross section. Thereby, the door beam 40 of this embodiment has a double structure of an outer member 51 and a stiffener 53 that is an inner member.

Further, the stiffener 53 has a vertically central portion in the longitudinal cross section that is a protruding portion 53a that protrudes outward in the vehicle width direction. In addition, in the longitudinal cross section of the stiffener 53, an upper wall (upper surface) 53b and a lower wall (lower surface) 53c, which are continuous to the upper and lower sides of the protrusion 53a, respectively, rise upward as they go from the outer side to the inner side in the vehicle width direction. It has a shape that spreads upward and downward, and has a substantially U-shaped cross section that is trapezoidal. Flange portions 54, 54 at the upper and lower ends of the stiffener 53 are joined to the back plate 55 by welding. Further, the flange portions 52, 52 at the upper and lower ends of the outer member 51 are also joined to the flange portions 54, 54 of the stiffener 53 and the back plate 55 by welding.

The stiffener 53 of the door beam 40 according to the present embodiment has a surface (a surface facing outward in the vehicle width direction) of the stiffener 53 recessed in a plurality of consecutive locations along the longitudinal direction so that the surface of the stiffener 53 faces inward in the vehicle width direction. A valley portion 57 is formed. FIG. 4 is a perspective view showing a plurality of valleys provided in the stiffener. As shown in FIGS. 2 and 4, the troughs 57 provided in the stiffener 53 are provided near the central portion 40c in the longitudinal direction of the protrusion 53a of the stiffener 53, and a plurality of (four in the figure) troughs are provided in the stiffener 53. 57 are formed in a row (continuously) along the longitudinal direction of the stiffener 53. As shown in FIG. 2, these troughs 57 are provided at or near the center portion 40c, which is the position where the stiffener 53 bulges outward most in the vehicle width direction in the longitudinal direction. That is, the center portion 40c, which is the position of the door beam 40 (stiffener 53) that bulges out most outward in the vehicle width direction, is located between the plurality of troughs 57 in the longitudinal direction of the stiffener 53. Note that the valley portion 57 of the stiffener 53 is formed during press molding of the stiffener 53 in accordance with the press molding.

The valley portion 57 is an easily deformable portion that is easily deformed by external force compared to other portions of the stiffener 53 (door beam 40). That is, the easily deformable portion is a portion that is more likely to deform than other portions of the door beam 40 due to a collision load applied to the door beam 40 during a side collision with the front door 14A.

The vehicle door structure of this embodiment includes an inner panel 20 located on the inside in the vehicle width direction of the vehicle, an outer panel 30 located on the outside in the vehicle width direction with respect to the inner panel 20, and an inner panel 20 located on the outside in the vehicle width direction with respect to the inner panel 20. and a door beam 40 provided between the outer panel 30 and the outer panel 30, the door beam 40 having a longitudinally central portion 40c wider than one end 40a and the other end 40b attached to the inner panel 20 in the vehicle width. The door beam 40 has a plurality of troughs (easily deformable parts) that are more easily deformed by external force than other parts of the door beam 40 and have an arch shape that bulges outward in the direction. 57 are provided.

According to the vehicle door structure of the present embodiment, easily deformable portions that are more easily deformed by external force than other portions of the door beam 40 are provided at multiple locations that are continuous along the longitudinal direction of the door beam 40. . Specifically, as this easily deformable portion, a valley portion 57 is provided by recessing the outer surface of the stiffener 53 of the door beam 40 in the vehicle width direction toward the inner side in the vehicle width direction. By providing such troughs 57, the troughs 57 at a plurality of locations deform when there is a side collision with the front door 14A. Thereby, it is possible to prevent large local deformation of only the portion (one location) of the door beam 40 that the object collided with. Therefore, the amount of inward deformation (displacement) of the door beam 40 in the vehicle width direction can be suppressed, and the amount of intrusion of the inner panel 20 into the passenger compartment can be suppressed, thereby improving the safety of the vehicle. .

In the present embodiment, the easily deformable portion is the valley portion 57 formed by recessing the outer surface of the stiffener 53 of the door beam 40 in the vehicle width direction toward the inner side in the vehicle width direction. It becomes possible to easily and reliably deform the easily deformable portions at a plurality of locations in the event of a side collision. Furthermore, since the easily deformable portion can be formed in accordance with the press molding of the door beam 40 (stiffener 53), the manufacturing process of the door beam 40 can be simplified, and the productivity of the vehicle can be improved. .

Further, in this embodiment, the stiffener 53 of the door beam 40 has an upper wall (upper surface) 53b and a lower wall (lower surface) 53c each of which has a shape that expands upward and downward as it goes from the outside to the inside in the vehicle width direction.

According to this configuration, the upper wall (upper surface) 53b and lower wall (lower surface) 53c of the stiffener 53 are easily deformed by the load upon a side collision with the front door 14A. Specifically, the upper wall (upper surface) 53b and lower wall (lower surface) 53c of the stiffener 53 are easily deformed so as to bend inward in the vehicle width direction. Therefore, it is possible to further improve the ability of the door beam 40 to follow the deformation of the door beam 40 against the load caused by the collision. Further, according to this configuration, it becomes easy to form the valley portion 57, which is an easily deformable portion, during press molding of the stiffener 53, so that the moldability of the door beam 40 is improved.

FIG. 5 is a schematic diagram for explaining the dimension setting of the door beam 40. In this embodiment, the door beam 40 (outer member 51) includes an outer wall (outer surface) 51a facing outward in the vehicle width direction, an upper side wall (upper surface) 51b extending inward in the vehicle width direction from the outer wall (outer surface) 51a, and It has a lower wall (lower surface) 51c. The valleys 57 formed in the stiffener 53 are provided to make it easier for the stiffener 53 to bend (inward in the vehicle width direction) when the stiffener 53 receives a load due to a collision. It is required that the portion 57 buckle under a relatively low load. Here, as shown in FIG. 5(a), when the door beam 40 has a square cross section with side a, the buckling width A is When A=a, the door beam 40 (trough portion 57) buckles at the lowest load. Further, as shown in FIG. 5(b), when the cross section of the door beam 40 is a rectangular cross section with the short side=Bb and the long side=Bh, when the buckling width A is A=Bb or A=Bh. The door beam 40 (stiffener 53) buckles under the lowest load.

Therefore, in consideration of the above characteristics, in this embodiment, the interval L between the plurality of troughs (easily deformable parts) 57 shown in FIG. Length B which is the sum of the length Bb of the wall (outer surface) 51a in the vertical direction and the length Bh of the upper wall (upper surface) 51b or the lower wall (lower surface) 51c in the vehicle width direction = Bb + 1/2 of Bh The dimensions are set as follows, that is, B/2=(Bb+Bh)/2≧L.

By setting the dimensions of the door beam 40 as described above, by making the interval L between the valleys (easily deformable parts) 57 provided in the door beam 40 equal to or less than the buckling wavelength (buckling length) of the door beam 40, the door beam Since the 40 troughs 57 can be buckled with a lower load, the plurality of troughs 57 can be deformed more reliably. Thereby, it is possible to more effectively prevent large local deformation of only one part of the portion where the external object M (see FIG. 5(c)) collides with the door beam 40. Therefore, the amount of inward deformation (displacement) of the door beam 40 in the vehicle width direction can be suppressed, and the amount of intrusion of the inner panel 20 into the passenger compartment can be suppressed, thereby further improving the safety of the vehicle. Can be done.

Furthermore, in the door structure of this embodiment, the valley portion 57, which is an easily deformable portion, is provided at or near a position 40c that bulges out to the outermost side in the vehicle width direction in the longitudinal direction of the door beam 40.

According to this configuration, in the case of a side collision with the front door 14A, the position 40c that bulges outward in the vehicle width direction in the longitudinal direction of the door beam 40 is likely to receive the load due to the collision of an external object; By providing the trough portion 57, which is an easily deformable portion, near the trough portion 57, it is possible to more effectively prevent only the portion of the door beam 40 that is collided with the object from being locally significantly deformed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various changes can be made within the scope of the claims and the technical idea described in the specification and drawings. is possible.

In the above embodiment, the outer surface of the door beam 40 (stiffener 53) in the vehicle width direction is used as the easily deformable part that is easily deformed by external force compared to other parts of the door beam 40 (stiffener 53). Although the valley portion 57 is shown as being recessed toward the direction of 57 but may have other configurations. For example, although detailed illustrations and explanations are omitted, it may be a slit portion or a thin wall portion provided in the door beam 40 (stiffener 53 or outer member 51). The slit section here may be a narrow strip-shaped opening formed in the door beam 40 (stiffener 53 or outer member 51) extending in the vertical direction, and the opening may be ) may be formed in plural pieces at predetermined intervals along the longitudinal direction. Further, the thin wall portion is a portion of the door beam 40 (stiffener 53 or outer member 51) that is thinner in thickness than other portions of the door beam 40 (stiffener 53 or outer member 51). A plurality of stiffeners may be formed at predetermined intervals along the longitudinal direction of the stiffener 53 or the outer member 51. Note that the specific shape of each thin portion is not particularly limited, and may be, for example, a narrow strip-shaped thin portion formed on the door beam 40 (stiffener 53 or outer member 51) and extending in the vertical direction. Further, as still another example of the easily deformable part, when the entire door beam 40 (stiffener 53 or outer member 51) is hardened, only a part (the easily deformable part) is not hardened. It may also include forming a low-rigidity part that is lower in rigidity than the other parts.

Further, in the above embodiment, the door beam 40 has a double structure including an outer member 51 and a stiffener (inner member) 53 on the outer side and the inner side in the vehicle width direction, but the door beam of the present invention has a double structure. Alternatively, the member corresponding to the outer member of this embodiment may be omitted, and a single layer structure may be provided that includes only the member corresponding to the stiffener. In that case, the easily deformable portion (trough) of the present invention is provided in a member corresponding to the single-layer stiffener.

10 Vehicle body 14 Side door 14A Front door 14B Rear door 14a Door body 16 Door opening 16A Front door opening 16B Rear door opening 17 Front pillar (body side member)
18 Center pillar (body side member)
20 Inner panel 21 Inner wall 22 Connection wall 23 Outer wall 30 Outer panel 40 Door beam 40a Front end 40b Rear end 40c Central part 41a Front curved part 41b Rear curved part 51 Outer member 51a Outer wall (outer surface)
51b Upper wall (inner and outer surfaces)
51c Lower wall (internal and external surfaces)
52 Flange portion 53 Stiffener (inner member)
53a Projection 53b Upper wall (upper surface)
53c Lower wall (lower surface)
54 Flange portion 55 Back plate 57 Valley portion (easily deformable portion)

Claims (6)

an inner panel located on the inside in the vehicle width direction of the vehicle, an outer panel located on the outside in the vehicle width direction with respect to the inner panel, and a door beam provided between the inner panel and the outer panel in the vehicle width direction; Equipped with
A door structure for a vehicle, characterized in that easily deformable portions that are more easily deformed by external force than other portions of the door beam are provided at a plurality of consecutive locations along the longitudinal direction of the door beam. 2. The vehicle door structure according to claim 1, wherein the easily deformable portion is a valley portion formed by recessing an outer surface of the door beam in the vehicle width direction toward the inner side in the vehicle width direction. The door beam includes an outer member located on the outer side in the vehicle width direction, and a stiffener located on the inner side in the vehicle width direction than the outer member,
3. The vehicle door structure according to claim 2, wherein the easily deformable portion is formed in the stiffener. 4. The vehicle door structure according to claim 3, wherein the stiffener has an upper surface and a lower surface each having a shape that widens upward and downward from the outside toward the inside in the vehicle width direction. The door beam includes an outer surface facing outward in the vehicle width direction, and an inner and outer surface extending from the outer surface inward in the vehicle width direction,
The distance between the plurality of easily deformable parts is equal to or less than 1/2 of the sum of the length of the outer surface in the vertical direction and the length of the inner and outer surfaces in the vehicle width direction. The vehicle door structure according to any one of claims 1 to 4. The door beam has an arch shape in which the center in the longitudinal direction bulges outward in the vehicle width direction from one end and the other end attached to the inner panel,
The vehicle according to any one of claims 1 to 4, wherein the easily deformable portion is provided at or near a position where the door beam bulges outward in the vehicle width direction in the longitudinal direction of the door beam. door structure.

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