Floor structure

Abstract

The vehicle floor structure of the embodiment includes a pair of side seals arranged facing each other in the vehicle width direction and respectively arranged in the vehicle length direction, a floor frame arranged between the pair of side seals and including a pair of longitudinal frames respectively arranged along the pair of side seals and at least one transverse frame installed between the pair of longitudinal frames in the vehicle width direction, and at least one core structure member arranged in the space provided by the floor frame and including material for absorbing impact.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2021-0081362, filed on June 23, 2021, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a base plate structure. Background Technology

[0004] In recent years, in order to expand the interior space of the vehicle floor structure, there has been an increasing use of concealed rails, which are hidden under the floor panel for seat guides.

[0005] Furthermore, there is an increasing demand for flat flooring for passageway structures without floor plates used in existing diesel locomotives.

[0006] In addition, various technologies are applied to the vehicle's floor structure to ensure passenger safety in the event of a collision.

[0007] Meanwhile, in order to reduce the weight of the vehicle's floor structure and improve fuel efficiency, people try to increase the strength of the frame material and reduce its thickness.

[0008] However, when the thickness of the frame material is reduced, there is a drawback: the bending stiffness of the frame decreases.

[0009] Therefore, it is necessary to study and develop a base plate structure that is suitable for collision stability while ensuring lightweight and bending stiffness.

[0010] The information disclosed in this background section is only for enhancing the understanding of the background technology of this invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0011] This invention relates to a base plate structure. Specific embodiments relate to a base plate structure that ensures impact strength and improves commercial characteristics, such as enhancing interior aesthetics.

[0012] One embodiment of the present invention provides a base plate structure having a concealed guide rail (hidden rail) structure, which is configured to insert core structure members into a base plate frame that serves as a skeleton, and seat guide rails are inserted between the core structure members.

[0013] According to one embodiment, the vehicle floor structure includes a pair of side seals arranged facing each other in the vehicle width direction and respectively forming along the vehicle length direction, a floor frame arranged between the pair of side seals and including a pair of longitudinal frames respectively arranged along the pair of side seals and at least one transverse frame installed between the pair of longitudinal frames in the vehicle width direction, and at least one core structure member arranged in the space formed by the floor frame and made of a material for absorbing impact.

[0014] Each of the opposing side seals may be formed of steel by joining the two ends of an outer frame and an inner frame in the vertical direction, thus forming an internal space. A side seal reinforcement, which may be made of extruded aluminum, is inserted into at least one internal space of the opposing side seal.

[0015] Each of a pair of longitudinal frames may include a main frame, an upper overlapping end, a lower overlapping end, a sub-frame, and an engaging end. The main frame is disposed on the inner surface of the corresponding side seal facing the opposite side seal, extends along the corresponding side seal to contact the corresponding side seal, and has at least one partition wall inside the main frame. The upper overlapping end is integrally formed on the upper side of the main frame, bends from the main frame, and overlaps with the upper surface of the corresponding side seal by a predetermined amount. The lower overlapping end is integrally formed on the lower side of the main frame and is configured to contact the inner surface of the corresponding side seal. The sub-frame is integrally formed on the side surface of the main frame, and the engaging end is integrally formed on the lower edge of the sub-frame.

[0016] The main frame may have a gradually decreasing cross section in the direction from the side seal to the opposite side seal.

[0017] Each of the longitudinal frames can be made of extruded aluminum.

[0018] At least one transverse frame may include, with reference to the length direction of the vehicle, a front transverse frame disposed at the front, a rear transverse frame disposed at the rear, and at least one intermediate transverse frame disposed between the front transverse frame and the rear transverse frame.

[0019] The front transverse frame may have a bottom surface that is formed as a slope sloping in the forward direction and is connected to the front structure together with the slope via a front flange extending from the slope.

[0020] The rear transverse frame may form at least one closed section and is connected to the rear structure via a rear flange extending from the rear edge.

[0021] Each of at least one intermediate transverse frame may form at least one closed cross section and is connected to at least one core structural member by an intermediate flange extending from each of the lower edges.

[0022] Each of at least one of the transverse frames is made of extruded aluminum.

[0023] At least one core structural member may include a core member disposed in the space formed by the base plate frame, a lower surface member made of aluminum and bonded to the lower part of the core member by an adhesive, an upper surface member made of aluminum and bonded to the upper part of the core member by an adhesive, and a core reinforcing member made of extruded aluminum and mounted on both sides of the core member in the length direction of the vehicle.

[0024] The core component can be made of foam from at least one of polyethylene terephthalate (PET), polyvinyl chloride (PVC), or polymethacrylamide (PMI).

[0025] Multiple slots can be formed on the upper surface component along the length of the vehicle. Seat rails can be installed into each slot.

[0026] An opening may be formed along the length of the upper surface of the seat rail. The lower surface of the seat rail may protrude from and contact the lower surface member. The seat rail may be integrally formed with and joined to the core reinforcing member or longitudinal frame through mounting portions protruding from its two side surfaces.

[0027] Seat rails can be made of extruded aluminum.

[0028] The floor structure according to the embodiment is constructed with a floor frame as a skeleton, in which core structural members are inserted, and seat rails are inserted into the core structural members. Therefore, the floor structure according to the embodiment achieves a concealed rail structure to improve interior aesthetics while ensuring bending stiffness and side-impact performance.

[0029] Furthermore, by inserting the seat rails into the core structure components through a concealed rail structure, the floor structure according to the embodiment can reduce the height of the floor structure and lower the vehicle's center of gravity.

[0030] In the detailed description of the embodiments of the application, other effects that may be obtained or predicted according to the embodiments will be described, explicitly or implicitly. That is, the various effects predicted according to the embodiments will be described in the following detailed description. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the base plate structure according to the implementation method.

[0032] Figure 2 This is a cross-sectional view of the base plate structure according to the implementation method.

[0033] Figure 3 It is along Figure 1 A cross-sectional view of line AA.

[0034] Figure 4 It is along Figure 1A cross-sectional view of the BB line.

[0035] Figure 5 This is a schematic diagram of a core structure component applied to a base plate structure according to an embodiment.

[0036] Figure 6 This is a schematic diagram illustrating a collision experiment of the base plate structure according to the embodiment.

[0037] The following elements can be used in conjunction with the accompanying drawings to describe embodiments of the present invention.

[0038] 1: Base plate structure; 3: Battery box

[0039] 10: Side seal 100: Inner surface of the side seal

[0040] 11: Outer frame 13: Inner frame

[0041] 15: Side sealing strip reinforcement

[0042] 150: Partition wall of side sealing strip reinforcement

[0043] 20: Base plate frame; 21: Longitudinal frame

[0044] 210: Main frame 211: Partition wall of the main frame

[0045] 213: Upper overlapping end; 215: Lower overlapping end

[0046] 217: Subframe 219: Engaging end

[0047] 23: Horizontal frame 230: Front horizontal frame

[0048] 230a: Front flange; 230b: Inclined surface

[0049] 231: Intermediate transverse frame; 231a: Intermediate flange

[0050] 233: Rear transverse frame; 233a: Rear flange

[0051] 30: Core structural component 31: Core component

[0052] 33: Lower surface component; 35: Upper surface component

[0053] 350: Groove 37: Core reinforcing member

[0054] 39: Adhesive; 40: Seat rail

[0055] 41: Opening 43: Mounting section

[0056] 50: Front structure; 60: Rear structure Detailed Implementation

[0057] The invention will now be described more fully with reference to the accompanying drawings, which illustrate embodiments of the invention. Those skilled in the art will recognize that the described embodiments can be modified in various ways without departing from the spirit or scope of the invention.

[0058] To clarify the embodiments of the invention, parts unrelated to the description will be omitted, and the same elements or equivalents will be referred to by the same reference numerals throughout the specification.

[0059] Furthermore, the dimensions and thicknesses of the various components are shown arbitrarily in the accompanying drawings, but the invention is not necessarily limited thereto, and the thicknesses of layers, films, plates, regions, etc., are exaggerated in the drawings for clarity.

[0060] Furthermore, in the following description, dividing the component names into first, second, etc., is a division of names, because the component names are the same, and their order is not particularly restricted.

[0061] Figure 1 This is a schematic diagram of the base plate structure according to the implementation method. Figure 2 This is a sectional view of the base plate structure according to the embodiment. Figure 3 It is along Figure 1 A cross-sectional view of line AA. Figure 4 It is along Figure 1 The cross-sectional view of the BB line, and Figure 5 This is a schematic diagram of a core structure component applied to a base plate structure according to an embodiment.

[0062] The base plate structure according to the implementation method can be applied to various types of mobile vehicles.

[0063] For example, the base plate structure according to the embodiment can be applied to various service or transportation vehicles that facilitate movement, such as automobiles, urban air mobility (UAM) vehicles, aircraft, etc.

[0064] In embodiments of the present invention, a chassis structure applied to automobiles will be used as an example for description.

[0065] Reference Figure 1 According to the embodiment, the base plate structure 1 can be disposed on the upper part of the battery box 3 for electric vehicles.

[0066] The base plate structure 1 protects the battery pack housed in the battery box 3 and forms the lower part of the vehicle.

[0067] Reference Figures 2 to 4 According to one embodiment, the base plate structure 1 includes a pair of side seals 10, a base plate frame 20, and a core structure member 30.

[0068] In this specification, the term "vehicle length direction" may refer to the length direction of the vehicle body (i.e., the front-to-back direction), the term "vehicle width direction" may refer to the lateral direction of the vehicle body, and the term "vertical direction" may refer to the height direction of the vehicle body.

[0069] Furthermore, in this specification, the term "inner surface" of a component may refer to a surface facing an interior space (e.g., a compartment space) formed by the component, and the term "outer surface" may refer to a surface of a component opposite to the inner surface. Alternatively, the term "inner surface" of a component may refer to a surface of one component facing another component, which is spaced apart but faces the first component, and the term "outer surface" of a component may refer to a surface of one component opposite to another component.

[0070] In addition, in this specification, the terms "upper end", "upper part", "upper end" or "upper surface" of a component refer to the end, part, end or surface of a component located at a relatively high position in the drawings, while the terms "lower end", "lower part", "lower end" or "lower surface" of a component refer to the end, part, end or surface of a component located at a relatively low position in the drawings.

[0071] A pair of side seals 10 are arranged to face each other in the vehicle width direction.

[0072] The opposite side seals 10 are configured to be symmetrical about the center on both sides in the vehicle width direction and formed in the vehicle length direction.

[0073] The opposite side seal 10 is made of steel.

[0074] Each of the opposite side seals 10 is formed by joining the outer frame 11 and the inner frame 13 at their two ends in the vertical direction, thus forming an internal space SP.

[0075] In addition, the side seal reinforcement 15 is inserted into at least one internal space of the pair of side seals 10.

[0076] The side seal reinforcement 15 is arranged to extend in the length direction of the vehicle.

[0077] The side seal reinforcement 15 is made of extruded aluminum material, and at least one partition wall 150 is disposed inside the side seal reinforcement 15.

[0078] The base frame 20 is positioned between a pair of side seals 10.

[0079] In one embodiment, the floor frame 20 includes a pair of longitudinal frames 21 arranged along a pair of side seals 10 and at least one transverse frame 23 mounted between the pair of longitudinal frames 21 along the vehicle width direction.

[0080] Each of a pair of longitudinal frames 21 includes a main frame 210, an upper overlapping end 213, a lower overlapping end 215, a sub-frame 217, and an engagement end 219.

[0081] The main frame 210 can be made of extruded aluminum material.

[0082] On the inner surface of each side seal 10 facing the opposite side seal 10, the main frame 210 extends along the corresponding side seal 10 to contact the side seal 10.

[0083] The main frame 210 has a gradually decreasing cross section in the direction from the corresponding side seal 10 to the opposite side seal 10.

[0084] In addition, at least one partition wall 211 is provided inside the main frame 210.

[0085] The upper overlapping end 213 is integrally formed on the upper side of the main frame 210.

[0086] The upper overlapping end 213 bends from the main frame 210 and overlaps with the upper surface of the corresponding side seal 10 by a predetermined amount.

[0087] The lower overlapping end 215 is integrally formed on the lower side of the main frame 210.

[0088] The lower overlapping end 215 can contact the inner surface 100 of the corresponding side seal 10 to increase the contact area.

[0089] The subframe 217 is integrally formed on the side surface of the main frame 210.

[0090] The subframe 217 can be formed as a rectangular cross section to form a closed cross section.

[0091] Furthermore, the meshing end 219 is integrally formed on the lower edge of the subframe 217.

[0092] The meshing end 219 can be connected to the core structure component 30.

[0093] Each of the longitudinal frames 21 can be made of extruded aluminum.

[0094] In addition, at least one transverse frame 23 includes a front transverse frame 230 disposed at the front, a rear transverse frame 233 disposed at the rear, and at least one intermediate transverse frame 231 disposed between the front transverse frame 230 and the rear transverse frame 233, with reference to the length direction of the vehicle.

[0095] The front transverse frame 230 has a bottom surface that is formed as an upwardly sloping surface 230b in the forward direction.

[0096] The front transverse frame 230 is connected to the front structure 50 together with the ramp 230b via a front flange 230a extending from the ramp 230b.

[0097] In one embodiment, the front structure 50 may be a dash panel.

[0098] The rear transverse frame 233 forms at least one closed section.

[0099] The rear transverse frame 233 is connected to the rear structure 60 via a rear flange 233a extending from the rear edge.

[0100] In one embodiment, the rear structure 60 may be a rear panel.

[0101] In addition, each of at least one intermediate transverse frame 231 forms at least one closed cross section.

[0102] Each of at least one intermediate transverse frame 231 is connected to at least one core structural member 30 via an intermediate flange 231a extending from each of the lower edges.

[0103] Although the accompanying drawings show two intermediate transverse frames 231 arranged between the front transverse frame 230 and the rear transverse frame 233, it is understood that the number of intermediate transverse frames 231 is not limited to this and can be varied as needed.

[0104] Each of at least one of the transverse frames 23 may be made of extruded aluminum material.

[0105] In one embodiment, at least one core structural member 30 is arranged in the space formed by the base plate frame 20.

[0106] In other words, the base frame 20 can form several spaces in the horizontal direction, and the core structure member 30 can be formed in any, each, or any desired space formed by the base frame 20.

[0107] The core structure member 30 may be made of a material for absorbing impact, which may be any material known in the art.

[0108] At least one core structural member 30 includes a core member 31, a lower surface member 33, an upper surface member 35, and a core reinforcing member 37 (see reference). Figure 5 ).

[0109] The core component 31 is arranged in the space formed by the base frame 20.

[0110] For example, the core member 31 can be arranged in each space separated by a pair of longitudinal frames 21 and at least one transverse frame 23.

[0111] The core component 31 can be respectively disposed between the front transverse frame 230 and the foremost intermediate transverse frame 231 of at least one intermediate transverse frame 231, between the rear transverse frame 233 and the rearmost intermediate transverse frame 231 of at least one intermediate transverse frame 231, and between an adjacent pair of at least one intermediate transverse frame 231.

[0112] The core component 31 may be made of foam made of at least one of polyethylene terephthalate (PET), polyvinyl chloride (PVC) or polymethacrylamide (PMI).

[0113] The lower surface component 33 can be made of aluminum.

[0114] The lower surface member 33 can be bonded to the lower part of the core member 31 by adhesive 39.

[0115] The lower surface member 33 can be provided in the amount corresponding to the core member 31.

[0116] That is, similar to the core member 31, the lower surface member 33 can be respectively disposed between the front transverse frame 230 and the foremost intermediate transverse frame 231 of at least one intermediate transverse frame 231, between the rear transverse frame 233 and the rearmost intermediate transverse frame 231 of at least one intermediate transverse frame 231, and between an adjacent pair of at least one intermediate transverse frame 231.

[0117] The upper surface component 35 can be made of aluminum.

[0118] The upper surface component 35 can be bonded to the upper part of the core component 31 by adhesive 39.

[0119] The upper surface member 35 can be configured to cover the core member 31, the sub-frame 217 of the longitudinal frame 21, and the transverse frame 23.

[0120] The core reinforcing member 37 can be mounted on two sides of the core member 31 along the length of the vehicle. For example, several core members 31 can be used, and the core reinforcing member 37 can be integrated into the core members 31 that are centrally arranged along the length of the vehicle, such as... Figure 2 As shown.

[0121] In addition, multiple grooves 350 are formed on the upper surface member 35 along the length direction of the vehicle.

[0122] Seat rails 40 are installed into each slot 350.

[0123] The seat rail 40 can be made of extruded aluminum.

[0124] An opening 41 is formed along the length of the upper surface of the seat guide rail 40.

[0125] The lower surface of the seat rail 40 protrudes from and contacts the lower surface member 33.

[0126] The seat rail 40 can be integrally formed with the two side surfaces of the seat rail 40 and engaged with the core reinforcement member 37 or the longitudinal frame 21 through the protruding mounting portion 43.

[0127] Mounting parts 43 can be formed at the front and rear of the seat guide rail 40 in the longitudinal direction, respectively.

[0128] Figure 6 This is a schematic diagram illustrating a collision test of the base plate structure 1 according to the embodiment.

[0129] refer to Figure 6 Referring to the base plate structure 1 according to the embodiment, in the event of a side collision, the impact force is transmitted to the core structure member 30 through the side seal 10 and the base plate frame 20, and can be absorbed by the core structure member 30.

[0130] At this time, the seat guide rail 40 plays the role of transmitting load.

[0131] In addition, the side seals 10 and the base frame 20 also serve to absorb impact forces and prevent damage to the battery box 3 located at the bottom of the base structure 1.

[0132] In other words, the load is concentrated on the side seal 10 and the longitudinal frame 21 of the base frame 20, and the longitudinal frame 21 deforms within the elastic range determined by its structure. Therefore, damage to the battery box 3 and the core structure component 30 can be prevented.

[0133] The base plate structure 1 according to the embodiment has the following structure: the base plate frame 20 serves as the skeleton, wherein the core structure member 30 is inserted, and the seat guide rail 40 is inserted into the core structure member 30.

[0134] Therefore, the base plate structure 1 according to the embodiment realizes a concealed track structure to improve the internal aesthetics while ensuring bending rigidity and side impact performance.

[0135] Furthermore, by inserting the seat guide rail 40 into the core structure member 30 through the concealed rail structure, the height of the base plate structure 1 and the center of mass of the vehicle can be reduced according to the embodiment.

[0136] Accordingly, the base plate structure 1 can improve the convenience of passengers getting on and off the vehicle.

[0137] While the invention has been described in conjunction with embodiments currently considered practical, it should be understood that the invention is not limited to the disclosed embodiments. Rather, the invention is intended to cover various modifications and equivalent arrangements within the spirit and scope of the appended claims.

Claims

1. A chassis structure for a vehicle, the chassis structure comprising: A pair of side seals are arranged facing each other in the width direction of the vehicle and are also arranged in the length direction of the vehicle. A base frame disposed between the pair of side seals includes a pair of longitudinal frames disposed along the pair of side seals and at least one transverse frame mounted between the pair of longitudinal frames in the vehicle width direction. as well as At least one core structural member, arranged within the space formed by the base plate frame, and comprising material for absorbing impact. Each of the pair of longitudinal frames includes: A main frame is arranged on the inner surface of the corresponding side seal facing the opposite side seal, extends along the corresponding side seal to contact the corresponding side seal, and has at least one partition wall inside the main frame; The upper overlapping end is integrally formed on the upper side of the main frame, bends from the main frame, and overlaps with the upper surface of the corresponding side seal by a predetermined amount. The lower overlapping end is integrally formed on the lower side of the main frame and contacts the inner surface of the corresponding side seal. A subframe, integrally formed on the side surface of the main frame; and The meshing end is integrally formed at the lower edge of the subframe.

2. The base plate structure according to claim 1, wherein: Each of the pair of side seals comprises steel material, which joins the outer frame and inner frame at their respective vertical ends and provides internal space; and Side seal reinforcements, including aluminum extrusion material, are arranged in at least one internal space of the pair of side seals.

3. The base plate structure according to claim 1, wherein the main frame has a gradually decreasing cross section in the direction from the corresponding side seal to the opposite side seal.

4. The base plate structure according to claim 1, wherein each of the pair of longitudinal frames comprises extruded aluminum material.

5. The base plate structure according to claim 1, wherein the at least one transverse frame comprises extruded aluminum material.

6. A chassis structure for a vehicle, the chassis structure comprising: A pair of side seals are arranged facing each other in the width direction of the vehicle and are also arranged in the length direction of the vehicle. A base plate frame disposed between the pair of side seals, the base plate structure comprising: A pair of longitudinal frames arranged along the pair of side seals respectively; A front transverse frame installed between the pair of longitudinal frames in the vehicle width direction and located at the front of the vehicle in the vehicle length direction; A rear transverse frame, mounted between the pair of longitudinal frames in the vehicle width direction and located at the rear of the vehicle in the vehicle length direction; and At least one intermediate transverse frame is installed between the pair of longitudinal frames in the vehicle width direction and arranged between the front transverse frame and the rear transverse frame; and At least one core structural member is arranged within the space provided by the base plate frame and includes material for absorbing impact. Each of the pair of longitudinal frames includes: The main frame is disposed on the inner surface of the corresponding side seal facing the opposite side seal, extends along the corresponding side seal to contact the corresponding side seal, and has at least one partition wall inside the main frame; The upper overlapping end is integrally formed on the upper side of the main frame, bends from the main frame, and overlaps with the upper surface of the corresponding side seal by a predetermined amount. The lower overlapping end is integrally formed on the lower side of the main frame and contacts the inner surface of the corresponding side seal. A subframe, integrally formed on the side surface of the main frame; and The meshing end is integrally formed at the lower edge of the subframe.

7. The base plate structure according to claim 6, wherein the front transverse frame has a bottom surface formed as an inclined surface in a forward direction and is connected to the front structure together with the inclined surface via a front flange extending from the inclined surface.

8. The base plate structure according to claim 6, wherein the rear transverse frame includes at least one closed section and is connected to the rear structure via a rear flange extending from the rear edge.

9. The base plate structure according to claim 6, wherein the at least one intermediate transverse frame comprises at least one closed section and is connected to the at least one core structural member by an intermediate flange extending from each of the lower edges.

10. The base plate structure according to claim 6, wherein: Each of the pair of side seals comprises steel material, which joins the outer frame and inner frame at their respective vertical ends and provides internal space; and Side seal reinforcements, including aluminum extrusion material, are arranged in at least one internal space of the pair of side seals.

11. The base plate structure of claim 6, wherein each of the pair of longitudinal frames comprises extruded aluminum material.

12. A chassis structure for a vehicle, the chassis structure comprising: A pair of side seals are arranged facing each other in the width direction of the vehicle and are also arranged in the length direction of the vehicle. A base frame disposed between the pair of side seals includes a pair of longitudinal frames disposed along the pair of side seals and at least one transverse frame mounted between the pair of longitudinal frames in the vehicle width direction. and At least one core structural member comprising a material for absorbing impact, wherein the at least one core structural member comprises: Core components arranged in the space formed by the base plate frame; The lower surface component comprises a first aluminum material and is bonded to the lower part of the core component by a first adhesive; An upper surface member, comprising a second aluminum material and bonded to the upper part of the core member by a second adhesive; and A core reinforcing member comprising extruded aluminum material and mounted on both sides of the core member along the length of the vehicle. Each of the pair of longitudinal frames includes: A main frame is arranged on the inner surface of the corresponding side seal facing the opposite side seal, extends along the corresponding side seal to contact the corresponding side seal, and has at least one partition wall inside the main frame; The upper overlapping end is integrally formed on the upper side of the main frame, bends from the main frame, and overlaps with the upper surface of the corresponding side seal by a predetermined amount. The lower overlapping end is integrally formed on the lower side of the main frame and contacts the inner surface of the corresponding side seal. A subframe, integrally formed on the side surface of the main frame; and The meshing end is integrally formed at the lower edge of the subframe.

13. The base plate structure according to claim 12, wherein the core component comprises foam, the foam comprising polyethylene terephthalate, polyvinyl chloride or polymethacrylamide.

14. The base plate structure according to claim 12, further comprising: Multiple slots are provided in the upper surface component along the length direction of the vehicle; as well as Seat rails are installed on each of the plurality of slots.

15. The base plate structure according to claim 14, further comprising an opening arranged along the length of the upper surface of the seat guide rail.

16. The base plate structure according to claim 15, wherein: The lower surface of the seat rail protrudes toward and contacts the lower surface member; and The seat rail is coupled to one of the core reinforcement members or the pair of longitudinal frames via mounting portions integrally formed with and protruding from the two side surfaces of the seat rail.

17. The base plate structure according to claim 14, wherein the seat rail comprises a second extruded aluminum material.

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