Reinforcing member for side beam of vehicle

Abstract

A reinforcement member for a side rail of a vehicle is provided. The reinforcement member includes an elongated hollow body having a closed cross-section. The elongated hollow body includes a first conforming wall and an access wall adjacent the first conforming wall. The access wall includes a plurality of spot weld access openings along a longitudinal direction. The first conforming wall is spot welded to a first mating surface of the side rail via the plurality of spot weld access openings. The elongated hollow body is manufactured from an ultra-high strength martensitic steel by a roll forming process.

Description

Technical Field

[0001] This disclosure relates to a reinforcing member for a side beam of a vehicle and a side beam assembly for a vehicle. Background Technology

[0002] A side beam is a body section located below the base of a door opening in a vehicle. Side beams are typically reinforced to improve collision energy management in external impact events. Reinforcement is achieved by attaching reinforcing members along the length of the side beam. Conventional reinforcing members for side beams are made of steel such as boron-rolled hardened steel, and the reinforced structures are heavy and expensive to manufacture. A reinforced side beam that is relatively lightweight while maintaining high collision energy management efficiency is desired. Summary of the Invention

[0003] According to one aspect of this disclosure, a reinforcing member for a side beam of a vehicle is provided. The reinforcing member is disposed within the side beam and includes a longitudinally elongated hollow body having a closed cross-section. The longitudinally elongated hollow body includes a first coordinating wall and an access wall adjacent to the first coordinating wall. The access wall includes a plurality of weld point access openings along a longitudinal direction, and the first coordinating wall is spot-welded to a first mating surface of the side beam via the plurality of weld point access openings.

[0004] In one embodiment, the hollow longitudinal body may further include a second coordinating wall opposite to the approach wall. The second coordinating wall is spot-welded to the second mating surface of the side beam via a plurality of weld points approach openings.

[0005] In another embodiment, the size of the weld point near the opening can be set to allow the tip of the welding machine to pass through.

[0006] In another embodiment, the reinforcing member may be generally linear in the longitudinal direction.

[0007] In another embodiment, the reinforcing member may have a cross-section that is consistent along the longitudinal direction.

[0008] In another embodiment, the reinforcing member may extend substantially along the length of the side beam.

[0009] In another embodiment, the first mating wall may be spot-welded to the first mating surface at different intervals along the longitudinal direction.

[0010] In another embodiment, the hollow body can be formed by rolling a metal sheet into a predetermined shape and joining the edges in the longitudinal direction by seam welding to form a closed cross section.

[0011] In another embodiment, the hollow body may be made of ultra-high strength martensitic steel.

[0012] In another embodiment, the size of the hollow body may be smaller than the size of the side beam to provide a gap between the body and the side beam when the body is welded to the side beam.

[0013] In another embodiment, the gap between the body and the side beams, as well as the weld joints near the openings, can be configured to allow the flow of paint emulsion during the electrophoresis process.

[0014] According to another aspect of this disclosure, a side beam assembly includes a side beam and a reinforcing member disposed within the side beam. The side beam extends in a longitudinal direction and includes a first mating surface and a second mating surface. The reinforcing member extends generally along the length of the side beam and includes a longitudinally elongated hollow body. The longitudinally elongated hollow body includes a first coordinating wall, an access wall adjacent to the first coordinating wall, and a second coordinating wall opposite to the access wall. The access wall includes a plurality of weld point access openings in the longitudinal direction. The first coordinating wall is spot-welded to the first mating surface via the plurality of weld point access openings, and the second coordinating wall is spot-welded to the second mating surface via the plurality of weld point access openings.

[0015] In one embodiment, the hollow body can be formed by rolling a martensitic steel sheet into a predetermined shape and then seaming the longitudinal edges together to form a closed cross section.

[0016] In another embodiment, the reinforcing member may be generally linear in the longitudinal direction.

[0017] In another embodiment, the side beam includes an inner shell and an outer shell. The inner shell is located close to the interior of the vehicle and is connected to the vehicle door. The outer shell is opposite to the inner shell and is connected to the side structure of the vehicle. A reinforcing member is welded to the outer shell of the side beam.

[0018] In another embodiment, the reinforcing member may include a first section located at the front of the vehicle. The reinforcing member may be welded to a side beam, thereby increasing the weld density in the first section of the reinforcing member.

[0019] In another embodiment, the reinforcing member may be welded to the A-pillar and the B-pillar in the longitudinal direction, and the weld density at the segments corresponding to the A-pillar and the B-pillar is higher than the weld density at the segment located below the door opening.

[0020] In another embodiment, the hollow body may further include a first connecting wall disposed between the first coordinating wall and the second coordinating wall, such that the first connecting wall, the first mating surface and the second mating surface define a first gap in the longitudinal direction to allow electrophoretic paint to flow, thereby promoting the formation of a desired coating thickness.

[0021] In another embodiment, the hollow body may further include a second connecting wall located between the first coordinating wall and the proximity wall. The second connecting wall may be spaced apart from the side beam to define a second gap in the longitudinal direction, thereby allowing electrophoretic paint to flow and promoting the formation of the desired coating thickness.

[0022] The reinforcing member disclosed herein is made of martensitic steel and manufactured by roll forming, having a closed cross-section. Martensitic steel reduces the weight of the reinforcing member, and roll forming reduces manufacturing costs compared to hydroforming and hot stamping designs. The reinforcing member includes a longitudinally elongated hollow body having a first coordinating wall and an approach wall, the approach wall having a plurality of weld point approach openings adjacent to the first coordinating wall. The weld point approach openings allow the tip of a welding machine to pass through to spot weld the longitudinal body to the side beam, and the weld point density can be varied. Spot welding at different intervals along the longitudinal direction improves the joint stiffness between the reinforcing member and the side beam. The reinforcing member further includes a second coordinating wall opposite the approach wall, the second coordinating wall being connected to the side beam, while the other walls are not mating. The side beam assembly of this disclosure can improve the impact energy management efficiency of the side beam. Furthermore, the gap between the reinforcing member and the side beam provides better emulsion flow during the electrophoretic paint spraying process. Attached Figure Description

[0023] Exemplary embodiments will be more clearly understood from the following concise description in conjunction with the accompanying drawings. The drawings illustrate non-limiting exemplary embodiments as described herein.

[0024] Figure 1 This is a schematic diagram of the side structure of a vehicle body, illustrating a portion of a reinforcing member in a side beam according to an embodiment of the present disclosure.

[0025] Figure 2 This is a perspective view of a reinforcing member according to an embodiment of the present disclosure.

[0026] Figure 3 This is a partial perspective view of the vehicle body, illustrating the connection of a reinforcing member at a location adjacent to the A-pillar of the vehicle according to an embodiment of the present disclosure.

[0027] Figure 4 This is a partial perspective view of the vehicle body, illustrating the connection of a reinforcing member at a location adjacent to the B-pillar of the vehicle according to an embodiment of the present disclosure.

[0028] Figure 5 This is a partial perspective view of a reinforcing member connected to a side beam according to an embodiment of the present disclosure.

[0029] Figure 6 It is a cross-sectional view of the side beam and the reinforcing member, illustrating a spot weld from the reinforcing member to the first mating surface of the side beam according to an embodiment of the present disclosure.

[0030] Figure 7 yes Figure 5 The cross-sectional view of the side beam and the reinforcing member illustrates the spot welding of the second mating surface of the reinforcing member to the side beam.

[0031] Figure 8 This is a side view of a reinforcing member, illustrating a plurality of weld points on the second coordinating wall of the reinforcing member according to an embodiment of the present disclosure.

[0032] Figure 9 This is a side view of the reinforcing member, illustrating multiple weld points on the first coordinating wall of the reinforcing member.

[0033] It should be noted that these figures are intended to illustrate the general characteristics of the methods, structures, and / or materials used in certain exemplary embodiments and to supplement the textual description provided below. However, these figures are not drawn to scale and may not accurately reflect the precise structural or performance characteristics of any given embodiment, and should not be construed as limiting or restricting the range of values ​​or properties covered by the exemplary embodiments. The use of similar or identical reference numerals in the various figures is intended to indicate the presence of similar or identical elements or features. Detailed Implementation

[0034] The disclosed reinforcing member for a side beam and the side beam assembly will be better understood by reading the following detailed description in conjunction with the accompanying drawings. The detailed description and drawings are merely examples of the various inventions described herein. Those skilled in the art will understand that the disclosed examples may be varied, modified, and altered without departing from the scope of the invention described herein. Many variations are contemplated for different applications and design considerations; however, for the sake of brevity, each contemplated variation is not described individually in the following detailed description.

[0035] Throughout the following detailed embodiments, examples of various reinforcing members and side beam assemblies are provided. Related features in the examples may be equivalent, similar, or different in different examples. For the sake of brevity, related features will not be described again in each example. Instead, the use of related feature names will indicate to the reader that the component with the related feature name may be similar to the related features in the previously explained examples. Features for a given example will be described in that example. The reader will understand that a given feature need not be identical or similar to the specific depiction of a related feature in any given drawing or example.

[0036] Figure 1This is a schematic diagram of a side structure 10 of a vehicle body according to one embodiment of the present disclosure. A side beam 14, or sill, is a body section located below the base of a door opening of the vehicle. The side structure 10 includes a roof frame 12, A-pillar 16, B-pillar 18, and C-pillar 20 in an upper section, a door opening 22, and a side beam 14 disposed below the door opening 22. The side beam 14 may extend longitudinally L1 from the A-pillar 16 to the C-pillar 20. A reinforcing member 100 is disposed in and connected to the side beam 14. The reinforcing member 100 may extend generally along the length of the side beam 14. In the depicted embodiment, the reinforcing member 100 extends to the front face 24 of the A-pillar 16. Because the reinforcing member 100 is located in the front of the vehicle, load management capabilities in frontal and offset impacts are improved. In some embodiments, the reinforcing member 100 extends to a location adjacent to and spaced away from the C-pillar 20. The reinforcing member 100 may be linear along its length. The length of the reinforcing member 100 can be configured to absorb the energy of a collision to maintain the integrity of the side beam. It should be understood that the reinforcing member of this disclosure can be used in vehicles with a D-pillar. The length, size, and location of the reinforcing member can be configured to reinforce the side beam or vehicle body to achieve a desired collision energy management rate.

[0037] In some embodiments, the reinforcing member 100 may be made of a lightweight material. In some embodiments, the reinforcing member is made of ultra-high strength steel and has a closed cross-section. The reinforcing member 100 is formed by rolling a sheet metal into a predetermined shape and joining the edges by seam welding along the longitudinal direction L1 to form a closed cross-section. In some embodiments, the reinforcing member 100 includes a plurality of weld points approaching an opening 26 along the longitudinal direction L1. The weld point approaching the opening 26 allows the tip of a welding machine to pass through to spot weld the reinforcing member 100 to the side beam 14 at predetermined intervals along the longitudinal direction L1. The closed cross-section provides better sectional characteristics compared to the open cross-section of a reinforcing structure in conventional techniques. Furthermore, the closed cross-section improves buckling strength.

[0038] Figure 1 Further illustrating the reinforcing member 100, it includes segment M located at the base portion 17 of the A-pillar 16, segment O located at the base portion 19 of the B-pillar 18, and segments N and P located below the door opening 22. Segments M, N, O, and P can be connected to the side beam 14 and / or the body structure 12 along the longitudinal direction L of the vehicle.

[0039] Figure 2 yes Figure 1A perspective view of the reinforcing member 100. The reinforcing member 100 includes a longitudinally elongated hollow body 102. The body 102 may have a closed cross-section. In some embodiments, the length of the cross-section of the body 102 along direction L2 may be uniform. In some embodiments, the reinforcing member 100 may be made of high-strength martensitic steel. The uniform construction of the body 102 along its length direction L2 allows the reinforcing member 102 to be rolled to form a closed cross-section. In some embodiments, the longitudinally elongated body 102 is formed by rolling a sheet metal into a predetermined shape and joining two edges along the length direction L2. In some embodiments, the two edges are joined along the length direction by seam welding. Roll forming is flexible to accommodate design variations, has reduced processing costs, and allows for the production of hollow bodies with different cross-sections and lengths.

[0040] The reinforcing member 100 may include a first coordinating wall 104, an access wall 106 adjacent to the first coordinating wall 104, and a second coordinating wall 108 opposite to the access wall 106. The first coordinating wall 104 and the second coordinating wall 108 are walls connected to the side beam 14 or other vehicle body structures (such as A-pillar 16 and B-pillar 18). The access wall 106 may include a plurality of weld point access openings 110 along a length direction L2. The weld point access openings 110 are configured to allow the tip of a welding machine to be inserted, thereby allowing the first coordinating wall 104 and the second coordinating wall 108 to be connected to the side beam 14 via welding. In some embodiments, the weld point access openings 110 may be configured to allow the welding machine to... Figure 6 , Figure 7 Insertion in two directions as described herein, such that a weld point near opening 110 allows spot welding at two walls (i.e., the first coordinating wall 104 and the second coordinating wall 108).

[0041] In some embodiments, the proximity wall 106 may further include a supplementary weld proximity opening 111 configured to allow spot welding of the second coordinating wall 108. The supplementary proximity opening 111 may be smaller than the weld proximity opening 110. Additionally, the reinforcing member 100 may include a plurality of orifices 113 to allow flow of electrophoretic paint.

[0042] In some embodiments, the reinforcing member 100 may further include a first connecting wall 116 and a second connecting wall 118. The first connecting wall 116 may be angled to the first coordinating wall 104 and disposed between the first coordinating wall 104 and the second coordinating wall 108. The second connecting wall 118 extends from the second coordinating wall 108 toward the adjacent wall 106 and is angled to the second coordinating wall 108. In some embodiments, the reinforcing member 100 may further include a bottom wall 120 generally parallel to the first coordinating wall 104. The second connecting wall 118 is disposed between the second coordinating wall 108 and the bottom wall 120. In the depicted embodiment, the hollow body 102 has a polygonal cross-section. It should be understood that the closed cross-section may have any suitable shape adjusted for optimal collision energy management rate.

[0043] The reinforcing member 100 may be connected to two or more mating surfaces of the side beam by welding. Figure 3 This is a partial perspective view of the reinforcing member 100, illustrating its connection to the side beam 14 and the A-pillar 16 of the vehicle. The first mating wall 104 of the reinforcing member 100 is connected to the first mating surface 112 of the side beam 120 via a plurality of first weld points 202 at predetermined intervals along the longitudinal direction L1 of the vehicle. The longitudinal direction L1 is generally the same as the length direction L2 of the reinforcing member 100. Figure 3 A first weld point 202 is shown. A second coordinating wall 108 is connected to the second mating surface 114 of the side beam 14 via a plurality of second weld points 204 at predetermined intervals along the longitudinal direction L1. On the segment M of the reinforcing member 100 corresponding to the A-pillar 16, the second coordinating wall 108 is connected to the second mating surface 114 and the base 50 of the A-pillar 16. A set of the first weld points 202 and the second weld points 204 can be spot welded via a proximity opening 110 using a welding machine. The connection in the longitudinal direction structurally connects the reinforcing member 100, the side beam 120, and the A-pillar 16.

[0044] Similarly, the segment O of the reinforcing member 100 corresponding to the B-column 18 is connected to the side beam 14 and the B-column 18 in the longitudinal direction L1. Figure 4 The connection between segment O of the reinforcing member 100 and the side beam 14 and B-pillar 18 is shown. As can be seen from the figure, the first coordinating wall 104 of the reinforcing member 100 is connected to the first mating surface 112 of the side beam 14 by a plurality of first weld points 202. The second coordinating wall 108 of the reinforcing member 100, the second mating surface 114 of the side beam 14, and the base 60 of the B-pillar 18 are structurally connected by a plurality of second weld points 204. The above-described connection in the length direction connects the reinforcing member 100, the side beam 120, and the B-pillar 18.

[0045] Figure 5 An exemplary connection is shown between segments N and P of the reinforcing member 100 and the side beam 14. Further reference... Figure 1 Segments N and P are the portions of the reinforcing member 100 located below the door opening 22. The side beam 120 includes an outer shell 122 and an inner shell 124, which are joined together to form a closed structure at the cross-section. The outer shell 122 and inner shell 124 are connected to the vehicle's outer panel 210, and the inner shell 124 is connected to the vehicle floor 220. The reinforcing member 100 is disposed inside the outer shell 122. The first coordinating wall 104 and the second coordinating wall 108 are connected to the first mating surface 112 and the second mating surface 114, respectively, via multiple weld points along the longitudinal direction L1. Further reference... Figures 2 to 3 The reinforcing member 100 is connected to the side beam 14, A-pillar 16, and B-pillar 18 to improve structural integrity in a collision event by transferring impact loads from the reinforcing member to mating components to engage the entire vehicle body structure within a single structural ring. The connection between the reinforcing member 100 and the side beam 14 at two surfaces (i.e., the first and second coordinating walls) stabilizes the cross-section and provides robust engagement with the surrounding structure, as well as better collision energy management.

[0046] In some embodiments, the reinforcing member 100 may include a first connecting wall 116 and a second connecting wall 118, both spaced apart from the side beam 14. That is, the unwelded walls of the reinforcing member 100 do not mate with other structures. The connecting wall 116, the first mating surface 112, and the second mating surface 114 together define a first gap 126 along the longitudinal direction L1. Similarly, the second connecting wall 118 is spaced apart from the side beam 120 to define a second gap 128 along the longitudinal direction L1. The open end of the reinforcing member, the weld point near the opening, and the non-mate of the unwelded wall 128 allow for sufficient electrophoretic flow of the paint emulsion during the electrophoretic process and provide a sufficiently large coating thickness to avoid corrosion. Furthermore, the gaps facilitate the drainage of moisture and other contents and thus prevent in-field corrosion. Therefore, the need for corrosion-resistant seals is eliminated. In some embodiments, the dimensions of the reinforcing member 100 are smaller than the dimensions of the side beam 14. In one embodiment, the cross-sectional dimensions of the reinforcing member 24 allow for easy loading of the reinforcing member into the side beam during the assembly process. In another embodiment, the cross-sectional dimensions of the reinforcing member provide a second gap 128 between the reinforcing member and the side beam when the reinforcing member is connected to the side beam.

[0047] Figures 6 to 7 An exemplary spot weld is shown between the reinforcing member 100 and the side beam 14. A first coordinating wall 104 is spot welded to a first mating surface 112 by a welding machine 300. The weld point is close to the opening 110, configured to allow insertion of a first tip 302 and a second tip 304 of the welding machine 300. In some embodiments, the first tip 302 and the second tip 304 of the spot welder 300 may be electrodes. Figure 6The positions of tips 302 and 304 are shown at the first mating surfaces 112 of the first coordinating wall 104 and the side beam 14. Figure 7 The positions of tips 302 and 304 are shown at the welding points of the second coordinating wall 108 and the second mating surface 114. In some embodiments, a proximity opening 110 is used to implement a set of weld points of either the first coordinating wall 104 or the second coordinating wall 108.

[0048] Multiple weld points in the near wall 106 near the opening 110 can be positioned to both control the deformation of the reinforcing member and position the weld points to optimize energy transfer. Figure 8 and Figure 9 The approach wall 106 of the reinforcing member 100 is shown. A plurality of weld points approach openings 110 are configured to enable spot welding of a first coordinating wall 104 to a first mating surface 112 and a second coordinating wall 108 to a second mating surface 114 at multiple points. In the depicted embodiment, the approach wall 106 further includes a plurality of supplementary weld points approach openings 111 to allow the second coordinating wall 108 to be spot welded to the second mating surface 114. A high density of weld points improves the function of preventing side beam buckling. In some embodiments, the weld point density at the front portion 140 of the reinforcing member 100 corresponding to the front of the vehicle can be the highest to provide a strong connection to the surrounding structure. In some embodiments, segments M, O corresponding to the A-pillar and B-pillar of the vehicle can have a high weld point density. In some embodiments, the distance between two weld points can range from about 35 mm to about 400 mm. In some embodiments, the distance between two weld points at the front portion 140 or at portions corresponding to the A-pillar and B-pillar along the length direction L2 can be about 35 mm.

[0049] Figure 8 The second weld point 204 in the second coordinating wall 108 is shown and can be seen through the weld point access opening 110 and the supplementary access opening 111. Figure 9 A plurality of first weld points 202 on the first coordinating wall 104 are shown. In some embodiments, a set of weld points on either the first coordinating wall 104 or the second coordinating wall 108 are configured to approach the opening 110 through the same weld point. In the depicted embodiment, the weld point approaching the opening 110 has an elliptical shape. It should be understood that the weld point approaching the opening 110 can have any suitable shape. The size of the weld point approaching the opening 110 is larger than the size of the supplementary weld point approaching the opening 111. The joint stiffness between the reinforcing member 100 and the side beam 120 increases the number of weld points in the longitudinal direction. The number and location of the weld point approaching the opening 110 are optimized to improve collision energy management capabilities.

[0050] The side beams and reinforcing members of the side beam assemblies disclosed herein offer various advantages. For example, the weight of the side beam assembly is reduced by increasing the weight of collision energy management efficiency. Furthermore, the reinforcing members require less processing investment due to the use of a roll forming process.

[0051] The above disclosure covers several different inventions with independent utility. Although each of these inventions has been disclosed in a specific form, it should not be considered that the above disclosure and the specific embodiments illustrated are limiting, as many variations are possible. The subject matter of this invention includes all novel and non-obvious combinations and sub-combinations of the various elements, features, functions and / or characteristics disclosed above and known to those skilled in the art as inherent to the present invention.

[0052] The following claims specifically point to some combinations and sub-combinations that are considered novel and non-obvious. These claims may refer to a "one" element or a "first" element or a synonym thereof. Such claims should be understood to include a combination of one or more such elements, neither requiring nor excluding two or more such elements. Other combinations and sub-combinations of the disclosed features, functions, elements and / or characteristics may be declared by modifying these claims or by presenting new claims in this application or related applications.

Claims

1. A reinforcing member disposed inside a side beam of a vehicle, comprising: A longitudinally elongated hollow body with a closed cross-section, the longitudinally elongated hollow body comprising: The first coordination wall; and An adjacent wall is located near the first coordinating wall, wherein the adjacent wall includes a plurality of weld point proximity openings along the longitudinal direction. The first coordinating wall is spot-welded to the first mating surface of the side beam via the plurality of weld points near the opening. The reinforcing member is further welded to pillars A and B in the longitudinal direction, and the weld density at the segments corresponding to pillars A and B is higher than the weld density at the segments located below the door opening. The main body further includes a second coordinating wall opposite to the approach wall, wherein the second coordinating wall is spot-welded to the second mating surface of the side beam via the plurality of weld points approach opening, and the other walls of the longitudinal hollow main body are not connected to the side beam and are spaced apart from the side beam.

2. The reinforcing member according to claim 1, wherein, The size of the weld point near the opening is set to allow the tip of the welding machine to pass through.

3. The reinforcing member according to claim 1, wherein, The reinforcing member is linear along the longitudinal direction.

4. The reinforcing member according to claim 1, wherein, The cross-section of the hollow body is consistent along the longitudinal direction.

5. The reinforcing member according to claim 1, wherein, The reinforcing member extends along the length of the side beam.

6. The reinforcing member according to claim 1, wherein, The first coordinating wall is spot-welded to the first mating surface at different intervals along the longitudinal direction.

7. The reinforcing member according to claim 1, wherein, The body is formed by rolling a metal sheet into a predetermined shape and joining the edges along the longitudinal direction by seam welding to form the closed cross section.

8. The reinforcing member according to claim 7, wherein, The hollow body is made of ultra-high strength martensitic steel.

9. The reinforcing member according to claim 1, wherein, The cross-sectional dimensions of the hollow body are smaller than those of the side beam, so as to provide a gap between the body and the side beam when the body is welded to the side beam.

10. The reinforcing member according to claim 9, wherein, At least one of the gap and the weld joint proximity opening allows for the flow of paint emulsion during the electrophoresis process.

11. A side beam assembly for a vehicle, comprising: A side beam, wherein the side beam includes a first mating surface and a second mating surface and extends in the longitudinal direction; A reinforcing member, wherein the reinforcing member is disposed inside the side beam along the longitudinal direction and has a longitudinally elongated hollow body, the longitudinally elongated hollow body comprising: First coordination wall; An adjacent wall to the first coordinating wall, wherein the adjacent wall includes a plurality of weld point proximity openings along the longitudinal direction; The second coordinating wall opposite the aforementioned proximity wall. The first coordinating wall is spot-welded to the first mating surface of the side beam via the plurality of weld points near the opening, and the second coordinating wall is spot-welded to the second mating surface of the side beam via the plurality of weld points near the opening. The reinforcing member is further welded to pillars A and B in the longitudinal direction, and the weld density at the segments corresponding to pillars A and B is higher than the weld density at the segments located below the door opening. The other walls of the longitudinal hollow main body are not connected to the side beam and are spaced apart from the side beam.

12. The side beam assembly of claim 11, wherein, The hollow body is formed by rolling martensitic steel plates into a predetermined shape and then welding the longitudinal edges together to form a closed cross section.

13. The side beam assembly of claim 11, wherein, The reinforcing member is linear along the longitudinal direction.

14. The side beam assembly of claim 11, wherein, The side beam includes an inner shell located near the interior of the vehicle and connected to the vehicle floor, and an outer shell opposite the inner shell and connected to the side structure of the vehicle, wherein the reinforcing member is welded to the outer shell of the side beam.

15. The side beam assembly of claim 11, wherein, The first mating wall and the second mating wall are spot-welded to the first mating surface and the second mating surface at a plurality of predetermined positions along the longitudinal direction, respectively.

16. The side beam assembly of claim 12, wherein, The first segment of the reinforcing member has a higher welding density, and the first segment is located at the front of the vehicle.

17. The side beam assembly of claim 11, wherein, The weld point is near at least one of the openings configured to allow the tip of a welding machine to be inserted to weld the first coordinating wall of the reinforcing member to the first mating surface of the side beam and to weld the second coordinating wall of the reinforcing member to the second mating surface of the side beam.

18. The side beam assembly of claim 11, wherein, The hollow body further includes a first connecting wall located between the first coordinating wall and the second coordinating wall, and the first connecting wall, the first mating surface, and the second mating surface define a first gap along the longitudinal direction, wherein the hollow body further includes a second connecting wall located between the first coordinating wall and the proximity wall, and the second connecting wall is spaced apart from the side beam to define a second gap along the longitudinal direction, and wherein the first gap and the second gap allow electrophoretic paint to flow to facilitate the formation of a desired coating thickness during the electrophoretic process.

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