Vehicle threshold structural member

Abstract

The invention discloses a vehicle doorsill structural member which comprises a multi-cavity pipe fitting, and the multi-cavity pipe fitting at least comprises a vehicle outer side cavity located on one side of a vehicle doorsill outer plate and a vehicle inner side cavity located on one side of a vehicle doorsill inner plate. Ripples extending in the length direction of the multi-cavity pipe fitting are arranged on the top wall and / or the bottom wall of the vehicle outer side cavity and / or the vehicle inner side cavity; the corrugations comprise outer protruding parts protruding towards the outer side of the multi-cavity pipe fitting and inner protruding parts protruding towards the inner side of the multi-cavity pipe fitting. Wherein when lateral collision occurs, the vehicle outer side cavity is crushed and deformed before the vehicle inner side cavity.

Description

Technical Field

[0001] The invention relates to a mechanical component, in particular to a vehicle structural component. Background Art

[0002] New energy vehicles are the focus of the current passenger car market. Compared with traditional fuel vehicles, new energy vehicles have higher requirements for passive safety performance. In addition to protecting the occupants in collision conditions, they also need to provide safety protection for the battery pack. In collision conditions, the battery pack is more likely to be squeezed during a side collision due to the concentrated deformation of the side column collision structure and the small energy absorption space. Therefore, providing the battery pack with full-area side column collision protection is an important requirement for the structural safety design of new energy vehicles.

[0003] In the prior art, the battery pack side full-area column collision protection structures mainly include the following:

[0004] A plate-shaped or tubular longitudinal reinforcement is added inside the cavity formed by the conventional threshold outer plate and inner plate, and the cross-section of the reinforcement is basically the same along the forward direction of the vehicle body. For example, the publication number is CN113825693A, the publication date is December 21, 2021, and the name is "Side threshold component for motor vehicle" discloses a side threshold component, which at least includes: an outer threshold member and an inner threshold member, and an outer volume is defined between the outer threshold member and the inner threshold member, an external profile member, and the outer profile member and the inner threshold member define an inner volume, a first profile member extending in the outer volume, the first profile member including at least one outer contact portion, at least one inner contact portion, and at least one joining wall joining the outer contact portion and the inner contact portion, and a second profile member extending in the inner volume, the second profile member including at least one outer contact portion, at least one inner contact portion, and at least one joining wall joining the outer contact portion and the inner contact portion.

[0005] Inside the cavity formed by the conventional rocker outer and inner panels, a plate-shaped or tubular transverse reinforcement is added, and the cross-section of the reinforcement is the same along the width of the vehicle body. For example, a Chinese patent document entitled "Vehicle Body Structure" with publication number CN215361572U and publication date December 31, 2021 discloses that the vehicle body structure includes: a battery and a protective structure, wherein the battery is mounted on the bottom portion of the central floor and the rear floor; the protective structure has a bottom portion for mounting the peripheral portion of the battery, and the protective structure includes plates, which are assembled to each other in a shape covering the peripheral portion of the central floor. In a side collision of the vehicle, the structure can distribute the collision load applied to the side surface of the protective structure in multiple directions to reduce the collision load applied to the battery, and can also prevent the battery from rupturing or being damaged, thereby safely protecting the battery. Summary of the invention

[0006] The object of the present invention is to provide a vehicle threshold structure, which can achieve vehicle side collision protection and can adapt to different levels of full-range column collision passive safety protection requirements, and is suitable for common vehicle threshold structures.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a vehicle threshold structure, which includes a multi-cavity pipe fitting, wherein the multi-cavity pipe fitting at least includes a vehicle outer cavity located on one side of the vehicle threshold outer plate and a vehicle inner cavity located on one side of the vehicle threshold inner plate; the top wall and / or bottom wall of the vehicle outer cavity and / or the vehicle inner cavity are provided with corrugations extending along the length direction of the multi-cavity pipe fitting; the corrugations include an outer protrusion protruding toward the outer side of the multi-cavity pipe fitting and an inner protrusion protruding toward the inner side of the multi-cavity pipe fitting; wherein when a side collision occurs, the vehicle outer cavity is crushed and deformed before the vehicle inner cavity.

[0008] The vehicle threshold structure of the present invention is installed between the inner and outer panels of the vehicle threshold. It is a reinforcing beam structure including at least two cavities (i.e., at least one cavity inside the vehicle and at least one cavity outside the vehicle), wherein the top wall and / or bottom wall of the cavity inside the vehicle and / or the top wall and / or bottom wall of the cavity outside the vehicle have corrugated features protruding toward the inside and outside of the cavity, so that when a side collision occurs, a stable collision force transmission path is formed in the lateral direction of the vehicle (i.e., the width direction of the vehicle), thereby realizing side collision protection. When a collision occurs, the structure forms a stable force transmission path with the outer and inner panels of the vehicle threshold in the above manner, and the cavity outside the vehicle is crushed and deformed before the cavity inside the vehicle.

[0009] Furthermore, in the vehicle door sill structure of the present invention, the characteristics of the corrugations are periodically distributed in the length direction of the multi-cavity tube.

[0010] Furthermore, in the vehicle rocker structure of the present invention, the protrusion height d1 of the outer protrusion is ≤5t, wherein t represents the wall thickness of the vehicle outer cavity or the vehicle inner cavity where the corrugation is located.

[0011] Furthermore, in the vehicle rocker structure of the present invention, the protrusion height d2 of the inner protrusion is ≤5t, wherein t represents the wall thickness of the vehicle outer cavity or the vehicle inner cavity where the corrugation is located.

[0012] Furthermore, in the vehicle rocker structure of the present invention, the characteristic periodic spacing d3 of the corrugations is ≤L, wherein L represents the width of the vehicle outer cavity or the vehicle inner cavity where the corrugations are located.

[0013] Furthermore, in the vehicle rocker structure of the present invention, along the width direction of the vehicle, there is an intermediate cavity between the vehicle outer cavity and the vehicle inner cavity.

[0014] Furthermore, in the vehicle door sill structure of the present invention, one vehicle outer side cavity is provided, and at least two vehicle inner side cavities are provided, and the at least two vehicle inner side cavities are stacked in a height direction and contact each other.

[0015] Furthermore, in the vehicle door sill structure described in the present invention, one vehicle outer cavity is provided, and at least two vehicle inner cavities are provided. The at least two vehicle inner cavities are arranged up and down in the height direction and have a spacing therebetween.

[0016] Furthermore, in the vehicle sill structure described in the present invention, at least two vehicle outer side cavities are provided, and the two vehicle outer side cavities are stacked in the height direction and contact each other; at least two vehicle inner side cavities are provided, and the two vehicle inner side cavities are stacked in the height direction and contact each other.

[0017] Furthermore, in the vehicle door sill structure described in the present invention, at least two vehicle outer side cavities are provided, and the two vehicle outer side cavities are stacked and arranged in the height direction and contact each other; at least two vehicle inner side cavities are provided, and the at least two vehicle inner side cavities are arranged up and down in the height direction and have a spacing between each other.

[0018] Furthermore, in the vehicle rocker structure of the present invention, the wall of the multi-cavity tube includes a first portion with a thickness of t1 and a second portion with a thickness of t2, wherein t2<t1.

[0019] That is to say, in this embodiment, the multi-cavity pipe fitting of the present invention adopts a design of unequal wall thickness.

[0020] Furthermore, in the vehicle rocker structure described in the present invention, the second portion with thickness t2 is the side wall with surface contact, and the first portion with thickness t1 is the top wall and bottom wall of the vehicle outer cavity and the top wall and bottom wall of the vehicle inner cavity.

[0021] Furthermore, the vehicle door sill structure described in the present invention also includes a mounting bracket connected to the multi-cavity pipe.

[0022] In this embodiment, the multi-cavity pipe is first connected to the mounting bracket and then assembled with the rocker inner panel and the rocker outer panel through the mounting bracket.

[0023] Furthermore, in the vehicle door sill structure described in the present invention, the multi-cavity pipe is made of high-strength steel material.

[0024] In some more specific embodiments, the tensile strength of the high-strength steel is above 1200 MPa.

[0025] The vehicle door sill structure of the present invention has the following advantages and beneficial effects:

[0026] The vehicle threshold structure of the present invention is assembled between the inner and outer panels of the vehicle threshold, and can form a stable collision force transmission path in the lateral direction of the vehicle when a lateral collision occurs.

[0027] The vehicle door sill structure described in the present invention can adjust the number and arrangement of the vehicle outer cavity and the vehicle inner cavity according to the lateral protection requirements, thereby obtaining a two-cavity, three-cavity, or four-cavity reinforced tube section design.

[0028] In a preferred embodiment of the present invention, in order to achieve maximum lightweight, the vehicle door sill structure of the present invention is designed with unequal wall thicknesses according to different requirements for deformation and energy absorption at different positions of the cross section of the multi-cavity pipe.

[0029] The multi-cavity pipe in the vehicle door sill structure of the present invention is made of ultra-high-strength steel material, and compared with the existing aluminum alloy extruded profile structure, it has the technical advantages of low comprehensive cost and strong versatility.

[0030] The vehicle door sill structure of the present invention can provide the vehicle with better side collision protection performance in the range from the A-pillar to the C-pillar.

[0031] Instruction Manual

[0032] Figure 1 The schematic diagram of the structure of the vehicle threshold structure member and the vehicle threshold inner plate and outer plate of the present invention is shown.

[0033] Figure 2 A schematic structural diagram of a vehicle door sill structure according to an embodiment of the present invention is shown.

[0034] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0035] Figure 4 Figure 2 Cross-sectional view at “section” in the figure.

[0036] Figure 5 A schematic cross-sectional view of a vehicle rocker structure according to the present invention is shown having a multi-cavity tube with two cavities in one embodiment.

[0037] Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0038] Figure 7A schematic cross-sectional view of a vehicle rocker structure according to the present invention having a three-cavity multi-cavity pipe in one embodiment is shown.

[0039] Figure 8 A schematic cross-sectional view of a vehicle rocker structure according to another embodiment of the present invention is shown, showing a multi-cavity tube having three cavities.

[0040] Fig. 9 A schematic cross-sectional view of a vehicle rocker structure according to another embodiment of the present invention is shown, showing a multi-cavity tube having three cavities.

[0041] Fig.10 A schematic cross-sectional view of a vehicle rocker structure according to the present invention is shown having a multi-cavity tube with four cavities in one embodiment.

[0042] Fig.11 A schematic cross-sectional view of a vehicle rocker structure according to another embodiment of the present invention is shown having a multi-cavity tube with four cavities.

[0043] Fig.12 A schematic diagram of the installation of a vehicle rocker structure according to the present invention with a rocker inner panel and a rocker outer panel in one embodiment is shown. DETAILED DESCRIPTION

[0044] The vehicle door sill structure of the present invention will be further explained and illustrated below in conjunction with specific embodiments and the accompanying drawings of the specification. However, such explanation and illustration do not constitute an improper limitation on the technical solution of the present invention.

[0045] Figure 1 The schematic diagram of the structure of the vehicle threshold structure member and the vehicle threshold inner plate and outer plate of the present invention is shown.

[0046] like Figure 1 As shown, in this embodiment, the vehicle threshold structure of the present invention includes a multi-cavity pipe 1 and a mounting bracket 2, and the multi-cavity pipe 1 includes a vehicle outer cavity located on one side of the vehicle threshold outer plate 4 and a vehicle inner cavity located on one side of the vehicle threshold inner plate 3.

[0047] In a more specific embodiment, the multi-cavity pipe 1 can be connected to the mounting bracket 2 by bolts, and then assembled into the interior of the rocker cavity formed by the vehicle rocker outer panel 4 and the vehicle rocker inner panel 3 .

[0048] Figure 2 A schematic structural diagram of a vehicle door sill structure according to an embodiment of the present invention is shown.

[0049] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0050] Figure 4 Figure 2 Cross-sectional view at “section” in the figure.

[0051] like Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the top wall and the bottom wall of the vehicle outer side cavity 31 located on the side of the vehicle outer side P are provided with corrugations 33 extending along the length direction of the multi-cavity pipe.

[0052] like Figure 4 As shown, the corrugation 33 includes an outer protrusion protruding toward the outside of the multi-lumen tube and an inner protrusion protruding toward the inner side direction Q of the multi-lumen tube, wherein the protrusion height of the outer protrusion is denoted as d1 and the protrusion height of the inner protrusion is denoted as d2.

[0053] It should be noted that, in another embodiment, the corrugations 33 may also be provided on the top wall and the bottom wall of the inner cavity 32 of the vehicle.

[0054] In yet another embodiment, the corrugations 33 may be provided on both the top and bottom walls of the cavity 32 on the vehicle interior side and the top and bottom walls of the cavity 31 on the vehicle exterior side.

[0055] Of course, in other embodiments, when corrugations are provided on the vehicle outer cavity 31 or the vehicle inner cavity 32 , the corrugations may also be provided only on the top wall or the bottom wall.

[0056] In a preferred embodiment, the corrugations 33 are characterized by being regularly distributed in a periodic manner along the length direction of the multi-cavity pipe. Figure 4 The “d3” in represents the characteristic periodic spacing of the corrugations.

[0057] In a more preferred embodiment, the protrusion height d1 of the outer protrusion is ≤5t, and the protrusion height d2 of the inner protrusion is ≤5t, where t represents the wall thickness of the cavity on the outer side of the vehicle or the cavity on the inner side of the vehicle where the corrugation is located (when the wall thickness is designed to be unequal, it represents the unthinned wall thickness t1 mentioned later). The characteristic periodic spacing d3 of the corrugation 33 is ≤L, where Figure 2 As shown, L represents the width of the cavity on the outside of the vehicle or the cavity on the inside of the vehicle where the corrugation 33 is located.

[0058] In a specific example, the wall thickness t of the multi-cavity pipe 1 may be 1.2 mm, l may be 45 mm, d1 = d2 = 1.5 mm, and the periodic spacing d3 of the corrugated feature may be 30 mm.

[0059] In the present invention, not only the corrugations have multiple configurations, but also the vehicle outer cavity 31 and the vehicle inner cavity 32 have multiple configurations.

[0060] Figure 5 A schematic cross-sectional view of a vehicle rocker structure according to the present invention is shown having a multi-cavity tube with two cavities in one embodiment.

[0061] like Figure 5 As shown, in this embodiment, for a vehicle with a relatively general side protection requirement, the multi-cavity pipe may include only one vehicle outer cavity 31 and one vehicle inner cavity 32. The vehicle outer cavity 31 is in surface contact with the rocker outer panel, and the vehicle inner cavity 32 is in surface contact with the rocker inner panel.

[0062] In a more preferred embodiment, Figure 6 As shown, the thickness of these surface contact portions is t2, and the thickness of the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 is t1, t2<t1, that is, the wall thickness of these surface contact portions is thinned, while the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 are the conduction paths of the collision force, so they are not thinned. In addition, the wall thickness of the side walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 that are in surface contact can also be thinned, for example, thinned to t2.

[0063] In a more specific embodiment, the multi-cavity pipe can be processed into an integrated pipe by a rolling process, or can be welded from a rectangular pipe and a C-shaped part. A person skilled in the art can adjust the cross-sectional dimensions, material strength, and wall thickness of the vehicle outer cavity 31 and the vehicle inner cavity 32 so that during a side collision, the vehicle outer cavity 31 is crushed and deformed before the vehicle inner cavity 32.

[0064] Figure 7 A schematic cross-sectional view of a vehicle rocker structure according to the present invention having a three-cavity multi-cavity pipe in one embodiment is shown.

[0065] like Figure 7 As shown, in one embodiment, for a vehicle model with a higher requirement for lateral protection, the multi-cavity pipe may include three cavities in its width direction, namely, a vehicle outer cavity 31, a middle cavity 34, and a vehicle inner cavity 32. The vehicle outer cavity 31 is in surface contact with the rocker outer panel, and the vehicle inner cavity 32 is in surface contact with the rocker inner panel.

[0066] In a more preferred embodiment, similar to Figure 6As shown, the thickness of these surface contact parts is t2, and the thickness of the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 is t1, t2<t1, that is, the wall thickness of these surface contact parts is thinned, while the top and bottom walls of the vehicle outer cavity 31, the middle cavity 34 and the vehicle inner cavity 32 are the conduction paths of the collision force, so they are not thinned. In addition, the side walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 in surface contact, and the side walls of the middle cavity 34 and the vehicle outer cavity 31 and the vehicle inner cavity 32 in surface contact can also be thinned, for example, to t2.

[0067] Figure 8 A schematic cross-sectional view of a vehicle rocker structure according to another embodiment of the present invention is shown, showing a multi-cavity tube having three cavities.

[0068] like Figure 8 As shown, in another embodiment with three cavities, the multi-cavity pipe has two vehicle inner cavities 32 and one vehicle outer cavity 31, and the two vehicle inner cavities 32 are stacked and contact each other in the height direction. The vehicle outer cavity 31 is in surface contact with the rocker outer panel, and the vehicle inner cavity 32 is in surface contact with the rocker inner panel.

[0069] In a more preferred embodiment, similar to Figure 6 As shown, the thickness of these surface contact portions is t2, and the thickness of the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 is t1, t2<t1, that is, the wall thickness of these surface contact portions is thinned, while the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 are the conduction paths of the collision force, so they are not thinned. In addition, the wall thickness of the side walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 that are in surface contact can also be thinned, for example, thinned to t2.

[0070] Fig. 9 A schematic cross-sectional view of a vehicle rocker structure according to another embodiment of the present invention is shown, showing a multi-cavity tube having three cavities.

[0071] like Fig. 9 As shown, in another embodiment with three cavities, the multi-cavity pipe has two vehicle inner cavities 32 and one vehicle outer cavity 31, and the two vehicle inner cavities 32 are arranged up and down in the height direction but do not contact each other, that is, there is a gap between them. The vehicle outer cavity 31 is in surface contact with the rocker outer panel, and the vehicle inner cavity 32 is in surface contact with the rocker inner panel.

[0072] In a more preferred embodiment, similar to Figure 6As shown, the thickness of these surface contact portions is t2, and the thickness of the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 is t1, t2<t1, that is, the wall thickness of these surface contact portions is thinned, while the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 are the conduction paths of the collision force, so they are not thinned. In addition, the wall thickness of the side walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 that are in surface contact can also be thinned, for example, thinned to t2.

[0073] A multi-cavity pipe with three cavities can be manufactured using a C-shaped part and a closed pipe with two cavities. Those skilled in the art can adjust the cross-sectional dimensions, material strength, and wall thickness of the vehicle outer cavity 31 and the vehicle inner cavity 32 so that during a side collision, the vehicle outer cavity 31 is crushed and deformed before the vehicle inner cavity 32.

[0074] Fig.10 A schematic cross-sectional view of a vehicle rocker structure according to the present invention is shown having a multi-cavity tube with four cavities in one embodiment.

[0075] For models with higher requirements for lateral protection, at least four cavities can be used. Fig.10 As shown, in one embodiment, the multi-cavity pipe may include two vehicle outer cavities 31 and two vehicle inner cavities 32, the two vehicle outer cavities 31 are stacked and contact each other in the height direction, and the two vehicle inner cavities 32 are arranged up and down in the height direction and have a spacing between each other. The vehicle outer cavity 31 is in surface contact with the rocker outer panel, and the vehicle inner cavity 32 is in surface contact with the rocker inner panel.

[0076] In a more preferred embodiment, similar to Figure 6 As shown, the thickness of these surface contact portions is t2, and the thickness of the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 is t1, t2<t1, that is, the wall thickness of these surface contact portions is thinned, while the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 are the conduction paths of the collision force, so they are not thinned. In addition, the wall thickness of the side walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 that are in surface contact can also be thinned, for example, thinned to t2.

[0077] Fig.11 A schematic cross-sectional view of a vehicle rocker structure according to another embodiment of the present invention is shown having a multi-cavity tube with four cavities.

[0078] like Fig.11As shown, in another embodiment with four cavities, the multi-cavity pipe fitting has two vehicle inner cavities 32 and two vehicle outer cavities 31, the two vehicle inner cavities 32 are stacked and contacted with each other in the height direction, and the two vehicle outer cavities 31 are also stacked and contacted with each other in the height direction, the vehicle outer cavity 31 is in surface contact with the rocker outer panel, and the vehicle inner cavity 32 is in surface contact with the rocker inner panel.

[0079] In a more preferred embodiment, similar to Figure 6 As shown, the thickness of these surface contact portions is t2, and the thickness of the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 is t1, t2<t1, that is, the wall thickness of these surface contact portions is thinned, while the top and bottom walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 are the conduction paths of the collision force, so they are not thinned. In addition, the wall thickness of the side walls of the vehicle outer cavity 31 and the vehicle inner cavity 32 that are in surface contact can also be thinned, for example, thinned to t2.

[0080] For a multi-cavity pipe with four cavities, it can be made of a two-cavity day-shaped pipe and a bow-shaped cracked cross-section part, or two two-cavity day-shaped pipes, or a three-cavity pipe and an open cross-section part. Those skilled in the art can adjust the cross-sectional dimensions, material strength, and wall thickness of the vehicle outer cavity 31 and the vehicle inner cavity 32 so that during a side collision, the vehicle outer cavity 31 is crushed and deformed before the vehicle inner cavity 32.

[0081] In a preferred embodiment of the present invention, the multi-cavity pipe is made of high-strength steel material, for example, high-strength steel with a tensile strength of more than 1200 MPa, or high-strength steel with a tensile strength of more than 1500 MPa.

[0082] Fig.12 A schematic diagram of the installation of a vehicle rocker structure according to the present invention with a rocker inner panel and a rocker outer panel in one embodiment is shown.

[0083] like Fig.12 As shown, in this embodiment, the vehicle threshold structure includes a multi-cavity pipe 1, which includes two cavities, a vehicle outer cavity and a vehicle inner cavity, and the corrugation is provided on the vehicle outer cavity. The multi-cavity pipe 1 is connected to the mounting bracket 2 by bolts. The multi-cavity pipe 1 is connected to the vehicle threshold outer plate 4 by bolts at the illustrated position 1-1, and is connected to the vehicle threshold outer plate 4 by spot welding at the illustrated position 1-2. The multi-cavity pipe 1 is connected to the vehicle threshold inner plate 3 by structural adhesive at the illustrated position 1-3.

[0084] The vehicle door sill structure of the present invention can provide a vehicle with better side collision protection performance in the range from the A-pillar to the C-pillar, and has a good prospect for promotion and application.

[0085] It should be noted that the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features recorded in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0086] It should also be noted that the above-listed embodiments are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made therewith can be directly derived or easily associated with the contents disclosed by those skilled in the art from the present invention, and all should belong to the protection scope of the present invention.

Claims

1. A vehicle threshold structure, characterized in that: The invention comprises a multi-cavity pipe fitting, wherein the multi-cavity pipe fitting comprises at least a vehicle outer cavity located on one side of a vehicle threshold outer plate and a vehicle inner cavity located on one side of a vehicle threshold inner plate; the top wall and / or the bottom wall of the vehicle outer cavity and / or the vehicle inner cavity are provided with corrugations extending along the length direction of the multi-cavity pipe fitting; the corrugations comprise an outer protrusion protruding toward the outer side of the multi-cavity pipe fitting and an inner protrusion protruding toward the inner side of the multi-cavity pipe fitting; wherein when a lateral collision occurs, the vehicle outer cavity is crushed and deformed before the vehicle inner cavity.

2. The vehicle rocker structure according to claim 1, characterized in that: The characteristics of the corrugations are periodically distributed in the length direction of the multi-cavity pipe.

3. The vehicle rocker structure according to claim 1, characterized in that: The protrusion height d1 of the outer protrusion is ≤5t, where t represents the wall thickness of the cavity on the outer side of the vehicle or the cavity on the inner side of the vehicle where the corrugation is located.

4. The vehicle rocker structure according to claim 1, characterized in that: The protrusion height d2 of the inner protrusion is ≤5t, where t represents the wall thickness of the cavity on the outer side of the vehicle or the cavity on the inner side of the vehicle where the corrugation is located.

5. The vehicle rocker structure according to claim 1, characterized in that: The characteristic periodic spacing of the corrugations is d3≤L, where L represents the width of the cavity on the outside of the vehicle or the cavity on the inside of the vehicle where the corrugations are located.

6. The vehicle rocker structure according to claim 1, characterized in that: Along the width direction of the vehicle, there is also an intermediate cavity between the vehicle outer cavity and the vehicle inner cavity.

7. The vehicle rocker structure according to claim 1, characterized in that: There is one vehicle outer side cavity, and there are at least two vehicle inner side cavities. The at least two vehicle inner side cavities are stacked in a height direction and contact each other.

8. The vehicle rocker structure according to claim 1, characterized in that: The vehicle outer side cavity is provided with one, and the vehicle inner side cavity is provided with at least two. The at least two vehicle inner side cavities are arranged up and down in the height direction and have a distance between each other.

9. The vehicle rocker structure according to claim 1, characterized in that: There are at least two vehicle outer side cavities, which are stacked in height and in contact with each other; there are at least two vehicle inner side cavities, which are stacked in height and in contact with each other.

10. The vehicle rocker structure according to claim 1, characterized in that: There are at least two vehicle outer side cavities, which are stacked in height and contact each other; there are at least two vehicle inner side cavities, which are arranged up and down in height and have a distance between each other.

11. The vehicle rocker structure according to claim 1, characterized in that: The wall of the multi-lumen tube includes a first portion with a thickness of t1 and a second portion with a thickness of t2, wherein t2<t1.

12. The vehicle rocker structure according to claim 11, characterized in that: The second portion with thickness t2 is the side wall with surface contact, and the first portion with thickness t1 is the top and bottom walls of the cavity on the vehicle exterior side and the top and bottom walls of the cavity on the vehicle interior side.

13. The vehicle rocker structure according to claim 1, characterized in that: Also included is a mounting bracket connected to the multi-cavity pipe.

14. The vehicle rocker structure according to claim 1, characterized in that: The multi-cavity pipe fitting is made of high-strength steel material.

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