Vehicle door systems and methods for improving the durability of vehicle door systems

Abstract

This invention relates to a door system (2) for a vehicle (1), comprising a body structure (3) and a first door structure (4). The first door structure (4) includes a first door impact beam (7). The first door impact beam (7) includes a first engagement portion (10) arranged to interact with a first receiving guide (12) of substantially corresponding shape. The first receiving guide (12) extends in the lateral direction of the body structure (3) and is aligned with an extension of a first lateral member (13). A vehicle and a method for improving the durability of the vehicle are disclosed. In the event of a side impact, the first door impact beam (7) is arranged to engage with the first lateral member (13), and the receiving guide is arranged to prevent the first engagement portion (10) from moving in the vertical direction.

Description

Technical Field

[0001] This invention relates to a method for improving the durability (i.e., stability) of a door system, and to a door system for a vehicle including a body structure and a first door structure. The body structure includes an opening leading to an interior compartment of the vehicle. The door system includes a displacement mechanism configured to displace the first door structure relative to the opening between an open position and a closed position. The first door structure in the closed position is arranged to cover at least a portion of the opening. The first door structure in the open position is arranged at a distance from the closed position along the longitudinal direction of the body structure. The first door structure includes a first door impact beam, which, when the first door structure is arranged in the closed position, extends between a lower portion and an upper portion of the body structure. Background Technology

[0002] Car doors can open in several different ways. One technical solution is to provide sliding front and rear doors. This solution necessitates the removal of the B-pillar, which is welded to the car body. To meet the requirements of side impact tests performed, such as those by Euro NCAP and US NCAP, the forces that are typically absorbed or transmitted by the B-pillar during an impact must be managed.

[0003] US6332641B1 discloses a vehicle without a B-pillar, in which the doors open outwards, i.e., the rear doors are so-called rear-opening doors. Reinforcing members are located near the mating surfaces of the front and rear doors to absorb the force of impacts from side impacts. Summary of the Invention

[0004] The purpose of this disclosure is to provide a door system and method for solving the problems stated herein. This purpose is achieved by a door system and method according to the invention. Advantageous exemplary embodiments are provided below.

[0005] This disclosure relates to a door system for a vehicle, comprising a body structure and a first door structure. The body structure includes an opening leading to an interior compartment of the vehicle. The door system includes a displacement mechanism configured to displace the first door structure relative to the opening between an open position and a closed position. The first door structure in the closed position is arranged to cover at least a portion of the opening. The first door structure in the open position is arranged at a distance from the closed position along the longitudinal direction of the body structure. The first door structure includes a first door impact beam, which, when the first door structure is in the closed position, extends between a lower portion and an upper portion of the body structure. The first door impact beam includes a first engagement portion disposed at its lower end, wherein the first engagement portion is arranged to interact with a substantially correspondingly formed first receiving guide disposed in the body structure when the first door structure is in the closed position. The first receiving guide has an extension in the lateral direction of the body structure, wherein the extension of the first guide is aligned with an extension of a first lateral member of the body structure extending in the lateral direction of the body structure. In the event of a side impact, the first door anti-collision beam is arranged to engage with the first transverse member, and the receiving rail is arranged to prevent the first engagement from moving in the vertical direction.

[0006] The advantage of the door system according to this disclosure lies in its improved door durability during a side impact. Arranging a first joint in the door impact beam of the first door structure to interact with a substantially correspondingly shaped first receiving guide arranged in the body structure provides a way for the door impact beam in the door structure to provide structural integrity for vehicles without a B-pillar. During a side impact, the first door impact beam is arranged to engage with a first lateral member of the body structure. Thus, when the first door structure deforms during an impact, the first lateral member absorbs the side impact force transmitted by the first door impact beam. The first receiving guide guides the first joint such that the first door impact beam of the first door structure faces the first lateral member, and also prevents the first joint, and thus the entire door structure, from moving vertically. This combination of features results in improved impact durability.

[0007] The door system may include a first bracket, the first bracket including a first engagement portion attached to the lower end of a first door anti-collision beam, such that in the event of a side impact, the first bracket engages with and weds into a first lateral member.

[0008] The bracket, which includes a first joint, can be designed to match a specific vehicle design and make the bracket suitable for meeting specific impact standards.

[0009] The height of the first bracket may be less than the distance between the upper outer part of the first receiving guide rail and the first transverse member, so that when the first bracket is wedged into the first transverse member, the movement of the first door anti-collision beam relative to the vehicle body structure in the vertical direction is restricted.

[0010] Since it is important for the door not to separate from the vehicle body, a bracket with a height less than the distance between the first receiving guide rail and the outer upper part of the first transverse member ensures improved vehicle durability during a side impact when the first bracket engages with the first transverse member.

[0011] The first joint may be substantially T-shaped, and the first receiving guide rail may have a substantially correspondingly shaped receiving section.

[0012] One of the functions of the door system is to ensure that the door structure does not separate from the body structure, thereby ensuring structural integrity during and after a side impact. The first joint, having a substantially T-shape, and a first receiving guide rail having a substantially correspondingly shaped receiving cross-section, interact in shape to prevent vertical movement of the first joint when guided within the first receiving guide rail during a side impact.

[0013] The door system may include a second door structure, wherein the door system includes a shifting mechanism configured to shift the second door structure relative to an opening between an open position and a closed position, wherein the second door structure in the closed position is arranged to cover at least a portion of the opening, and wherein the second door structure in the open position is arranged at a distance from the closed position along the longitudinal direction of the vehicle body structure, wherein the second door structure includes a second door anti-collision beam arranged to extend between the lower and upper parts of the vehicle body structure when the second door structure is in the closed position, wherein the second door anti-collision beam... The impact beam includes a second engagement portion disposed at the lower end of the second door impact beam, wherein the second engagement portion is arranged to interact with a substantially correspondingly formed second receiving guide disposed in the body structure when the second door structure is in the closed position, wherein the second receiving guide has an extension in the lateral direction of the body structure, wherein the extension of the second guide is aligned with an extension of a second lateral member of the body structure extending in the lateral direction of the body structure, wherein, in the event of a side impact, the second door impact beam is arranged to engage with the second lateral member, and the second receiving guide is arranged to prevent the second engagement portion from moving in the vertical direction.

[0014] In addition to the first door structure, the vehicle may include a second door structure, which includes the same components as the first door structure. The advantage of having a second door structure is that, since the vehicle will have two door structures capable of dispersing side impact forces, the durability of the door system is improved. Furthermore, the arrangement of the first and second door structures, each designed to improve the durability of the door system, ensures that the vehicle will meet side impact safety standards during a side impact that fully or substantially affects one of the door structures. Additionally, the advantages of the second door structure are the same as those of the first door structure described above.

[0015] The door system may include a second bracket, the second bracket including a second engagement portion attached to the lower end of the second door anti-collision beam, such that in the event of a side impact, the second bracket engages with and weds into the second lateral member.

[0016] By including a bracket with a second joint, the second joint can be designed to match a specific vehicle design and the bracket can be adapted to meet specific impact standards. For example, the first and second joints do not need to have the same design, but can be adapted to front door structures and rear door structures.

[0017] The height of the second bracket can be less than the distance between the second receiving guide rail and the upper outer part of the second transverse member, so that when the second bracket is wedged into the second transverse member, the movement of the second door anti-collision beam relative to the vehicle body structure in the vertical direction is restricted.

[0018] The advantages are the same as those of the first support mentioned above.

[0019] The second joint may be substantially T-shaped, and the second receiving guide may have a substantially correspondingly shaped receiving section.

[0020] The advantages are the same as those of the first joint and the first receiving guide rail mentioned above.

[0021] This disclosure also relates to vehicles including door systems according to the above description.

[0022] This disclosure also relates to a method for improving the durability of a door system in a vehicle, the door system including a body structure and a first door structure, the body structure including an opening to an interior compartment of the vehicle, wherein the door system includes a displacement mechanism configured to displace the first door structure relative to the opening between an open position and a closed position, wherein the first door structure in the closed position is arranged to cover at least a portion of the opening, and wherein the first door structure in the open position is arranged at a distance from the closed position in the longitudinal direction of the body structure, wherein the method includes the following steps:

[0023] - Provide a first door anti-collision beam for the first door structure, the first door anti-collision beam being arranged to extend between the lower part and the upper part of the body structure when the first door structure is in the closed position.

[0024] - Provide a first joint portion for the first door anti-collision beam located at the lower end of the first door anti-collision beam.

[0025] - A first receiving guide rail is provided, which is disposed in the lower part of the vehicle body structure. The first receiving guide rail has an extension in the lateral direction of the vehicle body structure and has a shape corresponding to the first joint portion of the first door anti-collision beam.

[0026] - Align the extension of the first receiving guide rail with the extension of the first transverse member of the vehicle body structure that extends in the transverse direction of the vehicle body structure.

[0027] The first joint is arranged to interact with the correspondingly formed first receiving guide rail when the first door structure is in the closed position.

[0028] In the event of a side impact, the first door anti-collision beam is arranged to engage with the first transverse member, and the first receiving guide rail is arranged to prevent the first engagement from moving in the vertical direction.

[0029] The advantages of this method are the same as those of the aforementioned door system.

[0030] The method may include the following steps:

[0031] - The first bracket, including the first joint, is attached to the lower end of the first door anti-collision beam, such that in the event of a side impact, the first bracket engages with the first lateral member and wedges into the first lateral member.

[0032] The method may include the following steps:

[0033] - The height of the first bracket is less than the distance between the first receiving guide rail and the upper outer part of the first transverse member, so that when the first bracket is wedged into the first transverse member, the movement of the first door anti-collision beam relative to the vehicle body structure in the vertical direction is restricted.

[0034] The vehicle door system includes a second door structure, and the door system includes a shifting mechanism configured to shift the second door structure relative to an opening between an open position and a closed position. The second door structure in the closed position is arranged to cover at least a portion of the opening, and the second door structure in the open position is arranged at a distance from the closed position in the longitudinal direction of the vehicle body structure. The method may include the following steps:

[0035] - Provide a second door anti-collision beam for the second door structure, the second door anti-collision beam being arranged to extend between the lower part and the upper part of the body structure when the second door structure is in the closed position.

[0036] - Provide a second joint for the second door impact beam, the second joint being located at the lower end of the second door impact beam.

[0037] - A second receiving guide rail is provided, which is arranged in the lower part of the vehicle body structure. The second receiving guide rail has an extension in the lateral direction of the vehicle body structure and has a shape corresponding to the second joint portion of the second door anti-collision beam.

[0038] - Align the extension of the second receiving guide rail with the extension of the second transverse member of the vehicle body structure that extends in the transverse direction of the vehicle body structure.

[0039] The second joint is arranged to interact with the correspondingly formed second receiving guide rail when the second door structure is in the closed position.

[0040] In the event of a side impact, the second door anti-collision beam is arranged to engage with the second transverse member, and the second receiving guide rail is arranged to prevent the second engagement from moving in the vertical direction.

[0041] The method may include the following steps:

[0042] - The second bracket, including the second joint, is attached to the lower end of the second door anti-collision beam, so that in the event of a side impact, the second bracket engages with the second lateral member and wedges into the second lateral member.

[0043] The method may include the following steps:

[0044] - The height of the second bracket is less than the distance between the second receiving guide rail and the upper outer part of the second transverse member, so that when the second bracket is wedged into the second transverse member, the movement of the second door anti-collision beam relative to the vehicle body structure in the vertical direction is restricted. Attached Figure Description

[0045] Figure 1 A vehicle including a door system according to this disclosure is illustrated schematically.

[0046] Figure 2 A cross-sectional view of the door structure of the door system according to this disclosure is schematically shown.

[0047] Figure 3 A schematic cross-sectional view of the door structure of the door system according to this disclosure is shown during a side impact.

[0048] Figure 4A schematic cross-sectional view of the door structure of the door system according to this disclosure during the later stages of a side impact is shown.

[0049] Figure 5 A schematic cross-sectional view of the first joint and the correspondingly formed first receiving guide rail is shown.

[0050] Figure 6 A vehicle including a door system according to another embodiment of the present disclosure is illustrated schematically. Detailed Implementation

[0051] Figure 1 A vehicle 1 including a door system 2 according to the present disclosure is schematically shown. The vehicle 1 has a length extension in the longitudinal or x-direction, a width extension in the lateral, transverse or y-direction, and a height extension in the vertical or z-direction.

[0052] The door system 2 includes a body structure 3 and a first door structure 4. The body structure 3 includes an opening 5 leading to an interior compartment 6 of the vehicle 1. The door system 2 includes a shifting mechanism (not shown) configured to shift the first door structure 4 relative to the opening 5 between an open position and a closed position. The first door structure 4 in the closed position is arranged to cover at least a portion of the opening 5. The first door structure 4 in the open position is arranged at a distance from the closed position along the longitudinal direction of the body structure 3. The first door structure 4 includes a first door impact beam 7, which, when the first door structure 4 is arranged in the closed position, extends between a lower portion 8 and an upper portion 9 of the body structure 3.

[0053] Examples of door structures that can utilize the door system 2 according to this disclosure are door structures having at least one sliding door, scissor door, or butterfly door, but other examples are also possible.

[0054] exist Figure 1 The diagram schematically illustrates a first door impact beam 7 including a first engagement portion 10 disposed at its lower end 11. When the first door structure 4 is in the closed position, the first engagement portion 10 is arranged to interact with a substantially correspondingly formed first receiving guide 12 disposed in the body structure 3. The first receiving guide 12 has an extension in the lateral or y-direction of the body structure 3, wherein the extension of the first guide is aligned with an extension of a first lateral member 13 of the body structure 3 extending in the lateral or y-direction. The first lateral member 13 may be, for example, a lateral member arranged to support a seat, or a lateral member disposed in the floor structure of the body structure 3. In the event of a side impact, the first door impact beam 7 is arranged to engage with the first lateral member 13, and the receiving guide is arranged to prevent the first engagement portion 10 from moving in the vertical or z-direction.

[0055] Figure 2 A schematic cross-sectional view of the first door structure 4 of the door system 2 according to this disclosure is shown. In this example, the view is a view of the first door structure of vehicle 1 when closed, viewed from the rear of vehicle 1, and is actually the left door. For the right door, depending on whether the door is a driver's door or a passenger door, or a rear door or a front door, these features will be mirrored in the design, where possible modifications are made.

[0056] The first door structure 4 includes a first door anti-collision beam 7 and a first bracket 14 attached to the first door anti-collision beam 7. For clarity, the external parts of the door have been removed. At the bottom end 15 of the first bracket 14, a first joint 10 can be seen. The first joint 10 may also be an integral part of the first door anti-collision beam 7, that is, the first joint 10 is located at the bottom end of the first door anti-collision beam 7.

[0057] In this example, the first joint 10 is arranged on the first bracket 14, and the first bracket 14 is attached to the lower end 11 of the first door anti-collision beam 7 via a first attachment device 16. The first attachment device 16 is arranged in a generally vertical slot 17. The number of first attachment devices 16 and thus the number of generally vertical slots 17 can be more than two, as shown, or only one, depending on the design.

[0058] The height H1 of the first bracket 14 is less than the distance D between the first receiving guide rail 12 and the upper outer surface 13a of the first transverse member 13.

[0059] exist Figure 2 In the closed position, the door structure interacts with the first engagement portion 10 and a substantially correspondingly formed first receiving guide rail 12 arranged in the body structure 3. The first receiving guide rail 12 has an extension along the y-direction or lateral direction of the body structure 3. The extension of the first guide rail is aligned with the extension of the first lateral member 13 of the body structure 3, which extends in the y-direction or lateral direction of the body structure 3.

[0060] Figure 3 A schematic cross-sectional view of the door structure of the door system 2 according to this disclosure is shown during a side impact. Figure 3 In the figure, a side impact is indicated by an arrow indicating the side impact force. As can be seen from the figure, under the impact force, the first door bumper beam 7 begins to bend and moves towards the center of the vehicle 1 in the lateral or y-direction. Therefore, the first bracket 14 attached to the first door bumper beam 7 moves within the first receiving guide rail 12 through the interaction between the first joint 10 and the first guide rail. In the figure, the first door bumper beam 7 has begun to engage with the first lateral member 13 via the first bracket 14.

[0061] Accordingly, if the first joint 10 is an integral part of the first door anti-collision beam 7, the door anti-collision beam will begin to engage with the first transverse member 13.

[0062] Figure 4 A schematic cross-sectional view of the door structure of the door system 2 according to this disclosure during the later stage of a side impact is shown. In the figure, the first bracket 14 has been engaged with the first transverse member 13. As can be seen, because the height H1 of the first bracket 14 is less than the distance D between the first receiving guide 12 and the upper outer surface 13a of the first transverse member 13, the movement of the first door anti-collision beam 7 relative to the vehicle body structure 3 in the vertical or z-direction is restricted when the first bracket 14 is wedged into the first transverse member 13.

[0063] Furthermore, the first attachment device 16 has moved within the substantially vertical slot 17, thereby allowing the first support 14 to rotate slightly. This can be seen from the fact that the first attachment device 16 is slightly separated from the bottom of the substantially vertical slot 17.

[0064] exist Figure 2 - Figure 4 In this context, the design of the first transverse member 13 is considered an exemplary disclosure. The design of the first transverse member 13 can vary, as long as the height H1 of the first bracket 14 is less than the distance D between the first receiving guide rail 12 and the upper outer surface 13a of the first transverse member 13, thereby restricting the movement of the first door anti-collision beam 7 relative to the vehicle body structure 3 in the vertical or z-direction when the first bracket 14 is wedged into the first transverse member 13.

[0065] Figure 5 A schematic cross-sectional view of the first joint 10 and the correspondingly formed first receiving guide 12 is shown. In the figure, the first joint 10 can be seen assembled within the first receiving guide 12. Figure 5 In the example, the first joint 10 is substantially T-shaped, for example, having a T-shaped cross-section, and the first receiving guide 12 has a substantially correspondingly shaped receiving cross-section. For illustrative purposes, the distance between the first joint 10 and the first receiving guide 12 is shown. As an alternative to the T-shape of the first joint 10, the first joint 10 may have a spherical cross-section, wherein the first receiving guide 12 has a substantially correspondingly shaped receiving cross-section. Of course, other alternative shapes of the cross-sections of the first joint 10 and the first receiving guide 12 can also achieve the desired function as described above.

[0066] As can be seen from the figure, the design of the first receiving guide rail 12 and the first joint 10 prevents the first joint 10 from moving in the vertical direction, i.e., in the z-direction. Furthermore, it also prevents the first joint 10 from moving longitudinally, i.e., in the x-direction. This prevents the first door structure 4 from moving forward or backward in the event of a side impact at an angle relative to the longitudinal direction of the vehicle 1.

[0067] Figure 6 A vehicle 1 including a door system 2 according to another embodiment of the present disclosure is schematically shown. The door system 2 also includes a second door structure 18 similar to the first door structure 4. The door system 2 includes a shifting mechanism (not shown) configured to shift the second door structure 18 relative to an opening 5 between an open position and a closed position, wherein the second door structure 18 in the closed position is arranged to cover at least a portion of the opening 5. The second door structure 18 in the open position is arranged at a distance from the closed position along the longitudinal direction of the vehicle body structure 3.

[0068] The second door structure 18 includes a second door anti-collision beam 19, which, when the second door structure 18 is in the closed position, extends between the lower portion 8 and the upper portion 9 of the body structure 3. Similar to the first door structure 4 described above, the second door anti-collision beam 19 includes a second engagement portion 20 disposed at its lower end 21. When the second door structure 18 is in the closed position, the second engagement portion 20 is arranged to interact with a substantially correspondingly formed second receiving guide rail 22 disposed in the body structure 3. The second door structure 18 includes the second receiving guide rail 22, which has an extension in the lateral direction of the body structure 3. The extension of the second receiving guide rail 22 is aligned with the extension of the second transverse member 23 of the body structure 3, which extends in the transverse direction of the body structure 3. In the event of a side impact, the second door anti-collision beam 19 is arranged to engage with the second transverse member 23, and the second receiving guide rail 22 is arranged to prevent the second engagement portion 20 from moving in the vertical direction.

[0069] Although not shown in detail, the second door structure may be similar to the first door structure, including a second bracket 24. The second bracket 24 includes a second engagement portion 20. The second bracket 24 is attached to the lower end of the second door anti-collision beam 19, such that in the event of a side impact, the second bracket 24 engages with and weds into the second lateral member 23. The second bracket 24 may be attached to the second door anti-collision beam 19 in the same manner as the first bracket 14 is attached to the first door anti-collision beam 7.

[0070] Similar to the first bracket 14, the height of the second bracket 24 may be less than the distance between the second receiving guide rail 22 and the upper outer part of the second transverse member 23, so that when the second bracket 24 is wedged into the second transverse member 23, the vertical movement of the second door anti-collision beam 19 relative to the vehicle body structure 3 is restricted.

[0071] Further similar to the first door structure, the second joint 20 may be substantially T-shaped, and the second receiving rail 22 may have a corresponding substantially T-shaped cross section or an alternative shape mentioned in combination with the first joint 10 and the first receiving rail 12.

[0072] Therefore, refer to Figure 2 - Figure 4 The description of the functions of the first door structure 4 and its components can also be applied to the second door structure 18. Depending on the model of the vehicle 1 and whether the second door is a rear door or a front door, design changes may be necessary, but the function of the second door structure 18 will remain the same as that of the first door structure 4.

[0073] Although the present disclosure has been described and illustrated in detail with reference to the accompanying drawings and the foregoing description, such description and illustration should be considered illustrative or exemplary, and the present disclosure is not limited to the exemplary embodiments disclosed.

[0074] List of reference numerals

[0075] 1 vehicle

[0076] 2. Door System

[0077] 3. Body Structure

[0078] 4 First door structure

[0079] 5 Openings

[0080] 6. Interior compartments

[0081] 7 First door anti-collision beam

[0082] 8. Lower part of the vehicle body

[0083] 9. Upper part of the vehicle body

[0084] 10 First joint

[0085] 11. Lower end of the first door anti-collision beam

[0086] 12 First receiving guide rail

[0087] 13 First transverse member

[0088] a Upper outer part

[0089] 14 First support

[0090] 15 Bottom

[0091] 16 First Attachment Device

[0092] 17. Vertical groove

[0093] 18 Second door structure

[0094] 19 Second door anti-collision beam

[0095] 20 Second joint

[0096] 21. Lower end of the second door anti-collision beam

[0097] 22 Second receiving guide rail

[0098] 23 Second transverse member

[0099] 24. Second support.

Claims

1. A door system (2) for a vehicle (1), the door system (2) comprising a vehicle body structure (3) and a first door structure (4), wherein, The vehicle body structure (3) comprises an opening (5) to an interior cabin (6) of the vehicle (1), wherein the vehicle door system (2) comprises a displacement mechanism configured for displacing the first vehicle door structure (4) relative to the opening (5) between an open position and a closed position, wherein the first vehicle door structure (4) in the closed position is arranged to cover at least a portion of the opening (5), and wherein the first vehicle door structure (4) in the open position is arranged at a distance from the closed position in a longitudinal direction of the vehicle body structure (3), wherein the first vehicle door structure (4) comprises a first vehicle door intrusion beam (7) arranged to extend between a lower part (8) of the vehicle body structure (3) and an upper part (9) of the vehicle body structure (3) when the first vehicle door structure (4) is arranged in the closed position, characterized in that the first vehicle door intrusion beam (7) comprises a first engagement portion (10) arranged at a lower end (11) of the first vehicle door intrusion beam (7), wherein the first engagement portion (10) is arranged to interact with a substantially correspondingly shaped first receiving rail (12) arranged in the vehicle body structure (3) when the first vehicle door structure (4) is in the closed position, wherein the first receiving rail (12) has an extension in a transverse direction of the vehicle body structure (3), wherein the extension of the first receiving rail is aligned with an extension of a first transverse member (13) of the vehicle body structure (3) extending in the transverse direction of the vehicle body structure (3), wherein the first vehicle door intrusion beam (7) is arranged to engage with the first transverse member (13) and the first receiving rail is arranged to prevent the first engagement portion (10) from moving in a vertical direction when a side impact occurs.

2. The vehicle door system (2) according to claim 1, wherein A first bracket (14) comprising the first engagement portion (10) is attached to the lower end (11) of the first vehicle door intrusion beam (7) such that the first bracket (14) engages with and wedges into the first transverse member (13) when a side impact occurs.

3. The vehicle door system (2) according to claim 2, wherein A height (H1) of the first bracket (14) is smaller than a distance (D) between the first receiving rail (12) and an outer upper part (13a) of the first transverse member (13) such that movement of the first vehicle door intrusion beam (7) relative to the vehicle body structure (3) in a vertical direction is limited when the first bracket (14) wedges into the first transverse member (13).

4. The vehicle door system (2) according to any one of claims 1 to 3, wherein The first engagement portion (10) is substantially T-shaped and the first receiving rail (12) has a substantially correspondingly shaped receiving cross-section.

5. The vehicle door system (2) according to any one of claims 1 to 3, wherein The vehicle door system (2) comprises a second door structure (18), wherein the vehicle door system (2) comprises a displacement mechanism configured for displacing the second door structure (18) relative to the opening (5) between an open position and a closed position, wherein the second door structure (18) in the closed position is arranged to cover at least a portion of the opening (5), and wherein the second door structure (18) in the open position is arranged at a distance from the closed position in a longitudinal direction of the vehicle body structure (3), wherein the second door structure (18) comprises a second door B-pillar (19) arranged to extend between a lower part (8) of the vehicle body structure (3) and an upper part (9) of the vehicle body structure (3) when the second door structure (18) is arranged in the closed position, wherein the second door B-pillar (19) comprises a second engagement portion (20) arranged at a lower end of the second door B-pillar (19), wherein the second engagement portion (20) is arranged to interact with a substantially correspondingly shaped second receiving rail (22) arranged in the vehicle body structure (3) when the second door structure (18) is in the closed position, wherein the second receiving rail (22) has an extension in a transverse direction of the vehicle body structure (3), wherein the extension of the second receiving rail is aligned with an extension of a second transverse member (23) of the vehicle body structure (3) extending in the transverse direction of the vehicle body structure (3), wherein the second door B-pillar (19) is arranged to engage with the second transverse member (23) and the second receiving rail (22) is arranged to prevent the second engagement portion (20) from moving in a vertical direction when a side impact occurs.

6. The vehicle door system (2) according to claim 5, wherein A second bracket (24) comprising the second engagement portion (20) is attached to the lower end of the second door B-pillar (19) such that the second bracket (24) engages with and wedges into the second transverse member (23) when a side impact occurs.

7. The vehicle door system (2) according to claim 6, wherein The second bracket (24) has a height that is less than a distance (D) between the second receiving rail (22) and an outer upper part of the second transverse member (23) such that movement of the second door B-pillar (19) relative to the vehicle body structure (3) in a vertical direction is limited when the second bracket (24) is wedged into the second transverse member (23).

8. The vehicle door system (2) according to claim 6, wherein The second engagement portion (20) is substantially T-shaped and the second receiving rail (22) has a corresponding substantially T-shaped cross-section.

9. A vehicle (1) comprising a vehicle door system (2) according to any one of claims 1-8.

10. A method for improving the durability of a door system (2) in a vehicle (1), the door system (2) comprising a vehicle body structure (3) and a first door structure (4), the vehicle body structure (3) comprising an opening (5) to an interior cabin (6) of the vehicle (1), wherein, The vehicle door system (2) comprises a displacement mechanism configured for displacing the first door structure (4) between an open position and a closed position in relation to the opening (5), wherein the first door structure (4) in the closed position is arranged to cover at least a part of the opening (5), and wherein the first door structure (4) in the open position is arranged at a distance from the closed position in a longitudinal direction of the vehicle body structure (3), wherein the method comprises the steps of: - providing the first door structure (4) with a first door B-pillar (7) arranged to extend between a lower part (8) of the vehicle body structure (3) and an upper part (9) of the vehicle body structure (3) when the first door structure (4) is arranged in a closed position, - providing the first door B-pillar (7) with a first engagement portion (10) arranged at a lower end (11) of the first door B-pillar (7), - providing a first receiving rail (12) arranged in the lower part (8) of the vehicle body structure (3), the first receiving rail having an extension in a transverse direction of the vehicle body structure (3) and having a shape corresponding to the first engagement portion (10) of the first door B-pillar (7), - aligning the extension of the first receiving rail (12) with an extension of a first transverse member (13) of the vehicle body structure (3) extending in the transverse direction of the vehicle body structure (3), wherein the first engagement portion (10) is arranged to be able to interact with the correspondingly shaped first receiving rail (12) when the first door structure (4) is in a closed position, wherein, upon occurrence of a side impact, the first door B-pillar (7) is arranged to be able to engage with the first transverse member (13) and the first receiving rail (12) is arranged to prevent the first engagement portion (10) from moving in a vertical direction.

11. The method of claim 10, wherein, The method comprises the steps of: - attaching a first bracket (14) comprising the first engagement portion (10) to the lower end (11) of the first door B-pillar (7), such that, upon occurrence of a side impact, the first bracket (14) engages with and wedges into the first transverse member (13).

12. The method of claim 11, wherein, The method comprises the steps of: - providing the first bracket (14) with a height that is less than a distance (D) between the first receiving rail (12) and an outer upper part (13a) of the first transverse member (13), such that, when the first bracket (14) is wedged into the first transverse member (13), movement of the first door B-pillar (7) in relation to the vehicle body structure (3) in a vertical direction is limited.

13. The method of any one of claims 10 to 12, wherein, The vehicle door system (2) comprises a second door structure (18), wherein the vehicle door system (2) comprises a displacement mechanism configured for displacing the second door structure (18) relative to the opening (5) between an open position and a closed position, wherein the second door structure (18) in the closed position is arranged to cover at least a portion of the opening (5), and wherein the second door structure (18) in the open position is arranged at a distance from the closed position in a longitudinal direction of the vehicle body structure (3), wherein the method comprises the steps of: - providing a second door B-pillar (19) for the second door structure (18), the second door B-pillar (19) being arranged to extend between a lower part (8) of the vehicle body structure (3) and an upper part (9) of the vehicle body structure (3) when the second door structure (18) is arranged in a closed position, - providing a second engagement portion (20) for the second door B-pillar (19), the second engagement portion being arranged at a lower end (11) of the second door B-pillar (19), - providing a second receiving rail (22) arranged in the lower part (8) of the vehicle body structure (3), the second receiving rail having an extension in a transverse direction of the vehicle body structure (3) and having a shape corresponding to the second engagement portion (20) of the second door B-pillar (19), - aligning the extension of the second receiving rail (22) with an extension of a second transverse member (23) of the vehicle body structure (3) extending in the transverse direction of the vehicle body structure (3), wherein the second engagement portion (20) is arranged to be able to interact with the correspondingly shaped second receiving rail (22) when the second door structure (18) is in a closed position, wherein, upon occurrence of a side impact, the second door B-pillar (19) is arranged to be able to engage with the second transverse member (23) and the second receiving rail (22) is arranged to prevent the second engagement portion (20) from moving in a vertical direction.

14. The method of claim 13, wherein, The method comprises the steps of: - attaching a second bracket (24) comprising the second engagement portion (20) to the lower end of the second door B-pillar (19), such that, upon occurrence of a side impact, the second bracket (24) engages with and wedges into the second transverse member (23).

15. The method of claim 14, wherein, The method comprises the steps of: - providing the second bracket (24) with a height that is less than a distance (D) between the second receiving rail (22) and an outer upper portion of the second transverse member (23), such that, when the second bracket (24) wedges into the second transverse member (23), movement of the second door B-pillar (19) relative to the vehicle body structure (3) in a vertical direction is limited.

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