Vehicle underbody protector fastening structure

Abstract

A bottom protector fastening structure includes a bumper assembly coupled to a chassis frame and including a bumper inner member and a bumper cover coupled to an outer side of the bumper inner member, and a bottom protector coupled to the bumper inner member of the bumper assembly in a direction perpendicular to a length direction of a vehicle body, the bottom protector including a bottom protector mounting assembly coupled to the bumper inner member and a bottom protection plate coupled to the bottom protector mounting assembly, and the bottom protector mounting assembly including a tube member extending in the direction perpendicular to the length direction of the vehicle body, a mounting bracket coupled to the tube member and the bumper inner member, and a bottom protector fixing bracket coupled to the mounting bracket on a first side and to the bottom protection plate on a second side.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2021-0138388, filed on October 18, 2021, which is incorporated herein by reference. Technical Field

[0003] This invention relates to a vehicle under-protector fastening structure. Background Technology

[0004] Typically, a front-end module (FEM) with a radiator is installed at the front of the vehicle body, along with a bumper to improve aerodynamic performance during driving and to cushion the impact in the event of a frontal collision.

[0005] In particular, such as Figure 1 and Figure 2 As shown, in the case of heavy-duty dump trucks and off-road vehicles (e.g., hydrogen-powered heavy-duty trucks), the ground clearance of the bumper 2 needs to be increased, so the lower end of the radiator 3 is inevitably exposed in front.

[0006] In the prior art, a fixed bottom protector mounting assembly is fastened to the chassis frame 1 at the front of the vehicle body, a fixed bumper 2 is fastened to the chassis frame 1, and a fixed bottom protection plate 4 is fastened to the bottom protector mounting assembly in the direction from the bottom of the vehicle upward.

[0007] However, in the prior art, since the operator enters the lower part of the vehicle and fastens the bottom protection plate 4 to the bottom protector mounting assembly from a downward position, foreign objects may enter the operator's eyes or cause musculoskeletal disorders. As a result, workability is reduced and may lead to a loss of working hours (M / H) in the mass production process.

[0008] Furthermore, since the bottom protective plate 4 is fastened to the bottom protector mounting assembly by fastening bolts, the outward-protruding fastening bolts degrade the appearance quality and may be susceptible to corrosion and damage. Additionally, to achieve the recessed shape of the fastening bolts, the cross-sectional area increases, which may worsen marketability due to encroachment on the package approach angle.

[0009] The information disclosed in this background section is only intended to enhance the understanding of the background of the present invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0010] This invention relates to a vehicle underbody protector fastening structure. A specific embodiment relates to a vehicle underbody protector fastening structure in which bolted connections are eliminated by integrally constructing the vehicle's radiator underbody protector with the bumper.

[0011] Embodiments of the present invention may provide a vehicle underbody protector fastening structure that has the advantage of removing exposed fastening bolts by welding the underbody protector mounting bracket to the underbody protector plate and mounting it within the enclosed approach angle.

[0012] An exemplary embodiment of the present invention provides a vehicle underbody protector fastening structure, which includes a bumper assembly connected to the front of the vehicle body and an underbody protector connected to the bumper assembly in a direction perpendicular to the length direction of the vehicle body.

[0013] The bumper assembly can be attached to a chassis frame extending along the length of the vehicle body, and can include a bumper inner member attached to a bottom protector and a bumper cover attached to the outer side of the bumper inner member.

[0014] The underbody protector may include an underbody protector mounting assembly attached to the bumper interior and an underbody protector plate attached to the underbody protector mounting assembly.

[0015] The underbody protector mounting assembly may include: a tubular member extending in a direction perpendicular to the length of the vehicle body; a mounting bracket connecting to the tubular member and the bumper inner member; and an underbody protector fixing bracket, one side of which is connected to the mounting bracket and the other side of which is connected to the underbody protection plate.

[0016] The mounting bracket can be connected to the bumper mounting bracket attached to the internal components of the bumper.

[0017] The vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention may further include a tube support bracket for supporting the tube member, and the underbody protection plate may be welded to the tube support bracket.

[0018] The pipe support can extend in a direction perpendicular to the extension direction of the pipe member.

[0019] The bottom protector mounting bracket can be connected to a step mounting component installed in the cover hinge bracket on the side connected to the chassis frame.

[0020] The mounting bracket can be formed into a curved shape, and reinforcing members can be attached to the curved portion.

[0021] The step mounting component can be connected to the cover hinge bracket in a direction perpendicular to the length of the vehicle body.

[0022] The step mounting component fixing bracket can be inserted between the bottom protector fixing bracket and the step mounting component.

[0023] One surface of the step mounting component fixing bracket can be bolted to the step mounting component, and another surface formed in a direction perpendicular to the first surface can be bolted to the bottom protector fixing bracket.

[0024] A strength-enhancing molding can be formed in the curved section between one surface and another of the mounting bracket of the step installation component.

[0025] The bottom protective plate may include a tool access opening, and the mounting bracket can be fastened to the other surface of the step mounting component by tool bolts through the tool access opening.

[0026] The two side edge flanges formed in a direction perpendicular to the surface of the bottom protective plate can be formed to have variable height.

[0027] The flange can be configured to increase its height toward the rear of the vehicle body.

[0028] A zigzag anti-sagging part can be provided on the rear side of the surface of the underbody protection plate in the vehicle, in a direction perpendicular to the surface of the underbody protection plate.

[0029] On each of the two side edges of the bottom protection plate, a strength-enhancing molding protrudes toward the vehicle body in a direction perpendicular to the surface of the bottom protection plate.

[0030] According to an exemplary embodiment of the present invention, by applying a component in which the bumper and the underbody protector are integrated, the underbody protector does not need to be assembled separately, thus reducing production and assembly costs.

[0031] By welding the underbody protection plate to the underbody protection mounting assembly, the underbody protection can be installed within the enclosed approach angle, thus improving marketability by ensuring a high ground clearance for the vehicle.

[0032] The problem of bolt corrosion can be solved by removing the bolts exposed during the installation of the bottom protector, thus eliminating the safety issues caused by the protective plate falling off when the bolts corrode.

[0033] The underbody protector can be installed and assembled as a single unit with the bumper, and the bolts are tightened through an opening at the front of the underbody protector using a tool, thus preventing musculoskeletal disorders in the operator and preventing foreign objects from entering the operator's eyes.

[0034] By applying a variable shape to the flanges at the edges of the bottom protector, sagging of the bottom protector can be prevented.

[0035] The strength of the bottom protector can be improved by forming a strength-enhancing molding on the surface of the bottom protective plate. Attached Figure Description

[0036] Figure 1 This is a view showing the bumper fastening structure of an existing vehicle underbody protector.

[0037] Figure 2 It schematically shows along Figure 1 A view of the cross section taken by the "AA" line.

[0038] Figure 3 This is a view illustrating a vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention.

[0039] Figure 4 This is a perspective view of a vehicle underrun protector fastening structure according to an exemplary embodiment of the present invention being applied to a vehicle from below.

[0040] Figure 5 This is a plan view from below showing the vehicle underrun protector fastening structure according to an exemplary embodiment of the present invention applied to a vehicle.

[0041] Figure 6 This is a side view of a vehicle with the vehicle underrun protector fastening structure according to an exemplary embodiment of the present invention applied to the vehicle.

[0042] Figure 7 It schematically shows along Figure 3 A view of the cross section taken by the "BB" line.

[0043] Figure 8 This is a view showing the underbody protector mounting assembly of a vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention.

[0044] Figure 9 This is a view showing the bottom protection plate of a vehicle bottom protector fastening structure according to an exemplary embodiment of the present invention.

[0045] Figure 10 This is a view showing the structure of the anti-sagging molded portion P formed in the bottom protection plate of the vehicle bottom protector fastening structure according to an exemplary embodiment of the present invention.

[0046] Figure 11 and Figure 12 This is a view showing the state in which the bottom protection plate of the vehicle bottom protector fastening structure according to an exemplary embodiment of the present invention is connected to the bottom protector mounting assembly.

[0047] Figure 13This is a view showing the state of the inner components of a bumper assembly, which is attached to a vehicle underrun protector fastening structure according to an exemplary embodiment of the present invention.

[0048] Figure 14 , Figure 15A and Figure 15B This is a view showing the state in which the underbody protector mounting assembly of the vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention is connected to the bumper assembly.

[0049] Figure 16 This is a view showing the state in which the cover hinge lower bracket and step mounting member according to an exemplary embodiment of the present invention are installed in the chassis frame of the vehicle underbody protector fastening structure.

[0050] Figure 17 This is a view showing the state in which the step mounting member fixing bracket of the vehicle underrun protector fastening structure according to an exemplary embodiment of the present invention is connected to the step mounting member.

[0051] Figure 18 This is a view showing the state in which the cover hinge lower bracket, the step mounting member, and the step mounting member fixing bracket are installed in the chassis frame of the vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention.

[0052] Figure 19 This is a view showing the state of the step mounting member fixing bracket connected to the tube bottom protector fixing bracket of the vehicle bottom protector fastening structure according to an exemplary embodiment of the present invention.

[0053] Figure 20 and Figure 21 This is a view showing the mounting bracket and step mounting component fixing bracket of the present invention being tightened by a tool in the vehicle underbody protector fastening structure with open bolts.

[0054] Various embodiments of the present invention can be described using the following elements in conjunction with the accompanying drawings.

[0055] 100: Vehicle underbody protection fastening structure; 7: Radiator

[0056] 10: Bumper assembly 12: Internal components of the bumper

[0057] 14: Bumper cover 15: Bumper mounting bracket

[0058] 16: Step mounting components; 18: Cover hinge lower bracket

[0059] 20: Bottom protector 22: Bottom protection plate

[0060] 24: Step installation component fixing bracket; 30: Chassis frame

[0061] 40: Bottom protector mounting assembly; 42: Pipe component

[0062] 44: Pipe support bracket 46: Mounting bracket

[0063] 48: Bottom protector fixing bracket 49: Reinforcing component

[0064] B: Bolt O: Tool enters the opening

[0065] S: Flange; K: Strength-enhancing molding part

[0066] P: Anti-sagging molding part Detailed Implementation

[0067] In the following, exemplary embodiments of the invention will be described in detail with reference to the accompanying drawings to enable those skilled in the art to readily implement the invention. The invention can be embodied in many different forms and is not limited to the exemplary embodiments described herein.

[0068] Furthermore, in various exemplary embodiments, constituent elements having the same construction will be representatively described using the same reference numerals in the exemplary embodiments, and in other exemplary embodiments, only constructions different from the exemplary embodiments will be described.

[0069] Please note that the accompanying drawings are schematic and not to scale. For clarity and convenience, the relative dimensions and proportions of the parts in the drawings are shown as if the sizes have been enlarged or reduced, and any dimensions are illustrative only and not limiting. Furthermore, the same reference numerals are used to denote similar features for the same structures, elements, or parts shown in two or more drawings. When a part is referred to as "on" or "above" another part, the part may be directly on the other part, or another part may be inserted between the two parts.

[0070] The exemplary embodiments of the present invention specifically illustrate one exemplary embodiment of the present invention. Therefore, many variations are expected. Thus, the exemplary embodiments are not limited to the specific form of the illustrated area, and include variations, for example, by manufacturing process.

[0071] In the following, a vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0072] Figure 3 This is a view illustrating a vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention. Figure 4 This is a perspective view from below showing the vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention applied to a vehicle. Figure 5This is a plan view from below showing the vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention applied to a vehicle. Figure 6 This is a side view of a vehicle undercarriage protector fastening structure according to an exemplary embodiment of the present invention being applied to a vehicle. Figure 7 It schematically shows along Figure 3 A view of the cross section taken by the "BB" line.

[0073] Reference Figures 3 to 7 According to an exemplary embodiment of the present invention, a vehicle underbody protector fastening structure 100 is mounted at the front of a chassis frame 30 extending longitudinally on both sides of the vehicle body, and a radiator 7 is mounted between the chassis frames 30. The underbody protector fastening structure 100 includes a bumper assembly 10 and an underbody protector 20.

[0074] The bumper assembly 10 is connected to the front of the vehicle body, and the bottom protector 20 is connected to the lower side of the bumper assembly 10 in a direction perpendicular to the length of the vehicle body at the lower part of the radiator 7.

[0075] The bumper assembly 10 is connected to a chassis frame 30 extending along the length of the vehicle body, and includes an inner bumper member 12 connected to a bottom protector 20 and a bumper cover 14 connected to the outer side of the inner bumper member 12. The inner bumper member 12 may be made of steel and connected to the bottom protector 20. The bumper cover 14 may be made of plastic.

[0076] The bottom protector 20 prevents damage to the lower end of the radiator 7 when the vehicle collides with external obstacles during driving. It is connected to the bumper assembly 10 and horizontally connected to the front of the chassis frame 30 of the vehicle body along the front-rear direction of the vehicle body.

[0077] The underbody protector 20 includes an underbody protector mounting assembly 40 that is coupled to the inner member of the bumper 12 (see [link]). Figure 8 ) and the bottom protection plate 22 connected to the bottom protector mounting assembly 40 (see Figure 9 ).

[0078] Figure 8 This is a view showing the underbody protector mounting assembly of a vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention.

[0079] Reference Figure 8 In an exemplary embodiment of the present invention, the bottom protector mounting assembly 40 is used to mount the bottom protector plate 22, which will be further described later, on the lower front side of the chassis frame 30 of the vehicle body.

[0080] The bottom protector mounting assembly 40 includes a tube member 42, a tube support bracket 44 attached to the tube member 42 to support the tube member 42, a mounting bracket 46 connected to each of the two sides of the tube member 42, and a bottom protector fixing bracket 48.

[0081] The pipe support bracket 44 can extend in a direction perpendicular to the extension direction of the pipe member 42, and multiple brackets can be configured.

[0082] Mounting bracket 46 is connected to the inner component of the bumper 12 via the bumper fixing bracket 15 described later.

[0083] One side of the bottom protector fixing bracket 48 can be connected to the mounting bracket 46, and the other side of the bottom protector fixing bracket 48 can be connected to the bottom protection plate 22. The mounting bracket 46 and the bottom protector fixing bracket 48 can be bolted to each other or formed integrally with each other.

[0084] Figure 9 This is a view showing the bottom protection plate of a vehicle bottom protector fastening structure according to an exemplary embodiment of the present invention.

[0085] Reference Figure 9 The bottom protective plate 22 may have a shape that is curved in the length direction of the vehicle and includes a tool entry opening O, a flange S and a strength-enhancing molding K.

[0086] The tool entry opening O can be formed facing the front and lower part of the vehicle, and the tool can enter the tool entry opening O, so that the mounting bracket 46 of the bottom protector mounting assembly 40 can be bolted to the other surface of the step mounting member fixing bracket 24 described later.

[0087] Flange S can be formed on each of the two side edges of the bottom protective plate 22 in a direction perpendicular to the surface of the bottom protective plate 22, and can be formed to have a variable height. The flange S can be configured such that its height gradually increases toward the rear of the vehicle body.

[0088] The strength-enhancing molding portion K can be formed on each of the two side edges of the surface of the bottom protection plate 22, and can protrude toward the vehicle body in a direction perpendicular to the surface of the bottom protection plate 22. The surface of the bottom protection plate 22 with the strength-enhancing molding portion K can be welded to the bottom protector fixing bracket 48, thereby increasing the strength of the bottom protection plate 22.

[0089] Figure 10This is a view showing the structure of an anti-sagging forming portion P formed in the bottom protection plate 22 of a vehicle bottom protector fastening structure according to an exemplary embodiment of the present invention. The anti-sagging forming portion P, formed in a zigzag (“Z” shape) direction perpendicular to the surface of the bottom protection plate 22, can be formed on the rear side of the surface of the bottom protection plate 22 in the vehicle. The anti-sagging forming portion P can reduce vibration of the bottom protection plate 22 when the vehicle is in motion or when the engine is idling after stopping, and can prevent the central portion of the bottom protection plate 22 from sagging.

[0090] Figure 11 and Figure 12 This is a view showing the state in which the bottom protection plate of the vehicle bottom protector fastening structure according to an exemplary embodiment of the present invention is connected to the bottom protector mounting assembly.

[0091] Reference Figure 11 and Figure 12 The bottom protection plate 22 can be welded to the pipe support bracket 44 and connected to the bottom protector fixing bracket 48 of the bottom protector mounting assembly 40 by welding through the strength-enhancing molding part K.

[0092] The mounting bracket 46 is formed into a curved shape, and the reinforcing member 49 is attached to the curved portion to supplement the strength of the mounting bracket 46.

[0093] Figure 13 This is a view showing the state of the inner components of a bumper assembly, which is attached to a vehicle underrun protector fastening structure according to an exemplary embodiment of the present invention.

[0094] like Figure 13 As shown, the bumper mounting bracket 15 is attached to the inner bumper component 12 and bolted to the mounting bracket 46, so that the vehicle underbody protector fastening structure 100 of this embodiment can be secured to the bumper assembly 10. An operator inserts a tool through the opening O formed in the underbody protection plate 22, thus the mounting bracket 46 can be bolted to the bumper mounting bracket 15.

[0095] Figure 14 , Figure 15A and Figure 15B This is a view showing the state in which the underbody protector mounting assembly of the vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention is connected to the bumper assembly.

[0096] Reference Figure 14 , Figure 15A and Figure 15BThe mounting bracket 46 of the bottom protector mounting assembly 40 can be bolted to the step mounting member 16. The step mounting member 16 can be mounted on the inner bumper member 12 in a direction perpendicular to the length of the vehicle body. The step mounting member 16 can be connected to the cover hinge lower bracket 18, which will be described later.

[0097] Mounting bracket 46 can be bolted not only to step mounting member 16, but also to bumper fixing bracket 15 attached to bumper inner member 12. Therefore, bottom protection plate 22 can be more securely fixed to bumper inner member 12.

[0098] Figure 16 This is a view showing the state in which the cover hinge lower bracket and step mounting member according to an exemplary embodiment of the present invention are installed in the chassis frame of the vehicle underbody protector fastening structure.

[0099] Reference Figure 16 The cover hinge lower bracket 18 can be fixedly installed in the side of the chassis frame 30, and the step mounting member 16 can be bolted to the cover hinge lower bracket 18. The cover hinge lower bracket 18 can be installed downward in a direction perpendicular to the length direction of the chassis frame 30, and the step mounting member can be installed towards the outside of the chassis frame 30 in a direction perpendicular to the cover hinge lower bracket 18.

[0100] Figure 17 This is a view showing the state in which the step mounting member fixing bracket of the vehicle underrun protector fastening structure according to an exemplary embodiment of the present invention is connected to the step mounting member.

[0101] Reference Figure 17 The step mounting bracket 24 can be bolted to the step mounting member 16 using bolt B. One surface of the step mounting bracket 24 can be bolted to the step mounting member 16, and another surface formed in a direction perpendicular to this one surface can be bolted to the bottom protector bracket 48. A strength-enhancing molding can be formed in a curved portion between one surface and the other surface of the step mounting bracket 24 to increase the strength of the step mounting bracket 24.

[0102] Figure 18 This is a view showing the state in which the cover hinge lower bracket, the step mounting member, and the step mounting member fixing bracket are installed in the chassis frame of the vehicle underbody protector fastening structure according to an exemplary embodiment of the present invention.

[0103] like Figure 18As shown, the lower cover hinge bracket 18 connects to the front of the chassis frame 30 and extends downward in a direction perpendicular to the length of the chassis frame 30, while the step mounting member 16 connects to the outside of the chassis frame 30 in a direction perpendicular to the lower cover hinge bracket 18. In this case, anti-deformation ribs can be formed on the surface facing the outer side of the vehicle body in the step mounting member fixing bracket 24. The anti-deformation ribs can be used to prevent the step mounting member fixing bracket 24 from deforming due to impact forces from the front to the rear of the vehicle.

[0104] Figure 19 This is a view showing the state of the step mounting member fixing bracket connected to the tube bottom protector fixing bracket of the vehicle bottom protector fastening structure according to an exemplary embodiment of the present invention.

[0105] Reference Figure 19 The step mounting component fixing bracket 24 is bolted to the bottom protector fixing bracket 48, and the step mounting component 16 is fixed to the curved side of the step mounting component fixing bracket 24. In addition, the pipe component 42 is connected to the connection between the bottom protector fixing bracket 48 and the mounting bracket 46, so that the connection can extend in a direction perpendicular to the length direction of the vehicle body.

[0106] Figure 20 and Figure 21 This is a view showing the mounting bracket and step mounting component fixing bracket of the present invention being tightened by a tool in the vehicle underbody protector fastening structure with open bolts.

[0107] Reference Figure 20 and Figure 21 The mounting bracket 46 and the step mounting component fixing bracket 24 can be bolted through the tool access opening O formed in the bottom protective plate 22. The operator can insert a tool through the tool access opening O formed in the bottom protective plate 22, thus preventing the operator from suffering musculoskeletal diseases and preventing foreign objects from entering the operator's eyes.

[0108] As described above, according to an exemplary embodiment of the present invention, by applying components that integrate the bumper and the underbody protector, the underbody protector does not need to be assembled separately, thus reducing production and assembly costs.

[0109] Furthermore, by welding the underbody protection plate to the underbody protection mounting assembly, the underbody protection can be installed within the enclosed approach angle, thus improving marketability by ensuring a high ground clearance for the vehicle.

[0110] In addition, by removing the bolts exposed to the outside when installing the bottom protector, the problem of bolt corrosion can be solved, thus eliminating the safety problem caused by the protective plate falling off when the bolts corrode.

[0111] In addition, the underbody protector can be installed and assembled as a single unit with the bumper, and the bolts can be tightened by using a tool to access the opening at the front of the underbody protector, thus preventing the operator from developing musculoskeletal disorders and preventing foreign objects from entering the operator's eyes.

[0112] In addition, by applying a variable shape to the flanges at the edges of the bottom protector, sagging of the bottom protector can be prevented.

[0113] In addition, the strength of the bottom protector can be improved by forming a strength-enhancing molding part on the surface of the bottom protective plate.

[0114] While the invention has been described in conjunction with exemplary embodiments that are now considered practical, it will be understood that the invention is not limited to the disclosed embodiments. Rather, the invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A bottom protector fastening structure, comprising: A bumper assembly, coupled to a chassis frame extending along the length of the vehicle body, and the bumper assembly includes an inner bumper member and a bumper cover coupled to the outer side of the inner bumper member; and A bottom protector, connected to an inner member of the bumper assembly in a direction perpendicular to the length of the vehicle body, the bottom protector including a bottom protector mounting assembly connected to the inner member of the bumper and a bottom protection plate connected to the bottom protector mounting assembly, and the bottom protector mounting assembly including: The tubular component extends in a direction perpendicular to the length direction of the vehicle body; Mounting brackets are connected to the tubular component and the bumper inner component; and A bottom protector fixing bracket, the first side of which is connected to the mounting bracket, and the second side of which is welded to the bottom protection plate.

2. The bottom protector fastening structure according to claim 1, wherein, The mounting bracket is connected to the bumper fixing bracket attached to the inner component of the bumper.

3. The bottom protector fastening structure according to claim 1, wherein, The two side edge flanges formed in a direction perpendicular to the surface of the bottom protective plate have variable heights.

4. The bottom protector fastening structure according to claim 3, wherein, The height of each of the edge flanges increases toward the rear of the vehicle body.

5. The bottom protector fastening structure according to claim 1, further comprising: An anti-sagging forming part is formed on the rear side of the surface of the bottom protective plate, and the anti-sagging forming part is formed in a zigzag shape in a direction perpendicular to the surface of the bottom protective plate.

6. The bottom protector fastening structure according to claim 1, further comprising: A strength-enhancing molding portion is formed on each of the two side edges of the surface of the bottom protective plate and protrudes toward the vehicle body in a direction perpendicular to the surface of the bottom protective plate.

7. A bottom protector fastening structure, comprising: A bumper assembly, coupled to a chassis frame extending along the length of the vehicle body, and the bumper assembly includes an inner bumper member and a bumper cover coupled to the outer side of the inner bumper member; and A bottom protector, connected to an inner member of the bumper assembly in a direction perpendicular to the length of the vehicle body, the bottom protector including a bottom protector mounting assembly connected to the inner member of the bumper and a bottom protection plate connected to the bottom protector mounting assembly, and the bottom protector mounting assembly including: The tubular component extends in a direction perpendicular to the length direction of the vehicle body; Mounting brackets are connected to the tubular component and the inner component of the bumper; A bottom protector mounting bracket, wherein a first side of the bottom protector mounting bracket is connected to the mounting bracket, and a second side of the bottom protector mounting bracket is welded to the bottom protection plate; and A pipe support bracket supports the pipe component, and the bottom protective plate is welded to the pipe support bracket.

8. The bottom protector fastening structure according to claim 7, wherein, The tube support extends in a direction perpendicular to the extension direction of the tube member.

9. The bottom protector fastening structure according to claim 8, further comprising: A step mounting component is installed in a cover hinge bracket connected to the side of the chassis frame, and the bottom protector fixing bracket is connected to the step mounting component.

10. The bottom protector fastening structure according to claim 9, wherein, The mounting bracket has a curved shape, and a reinforcing member is attached to the curved portion of the curved shape.

11. The bottom protector fastening structure according to claim 9, wherein, The step mounting component is connected to the lower bracket of the cover hinge in a direction perpendicular to the length direction of the vehicle body.

12. The bottom protector fastening structure according to claim 11, further comprising: A step mounting component fixing bracket is inserted between the bottom protector fixing bracket and the step mounting component.

13. The bottom protector fastening structure according to claim 12, wherein, The first surface of the step mounting component fixing bracket is bolted to the step mounting component, and the second surface of the step mounting component fixing bracket, formed in a direction perpendicular to the first surface, is bolted to the bottom protector fixing bracket.

14. The bottom protector fastening structure according to claim 13, further comprising: The strength-enhancing molding portion is formed in a curved section between the first and second surfaces of the fixing bracket of the step mounting component.

15. The bottom protector fastening structure according to claim 13, wherein, The bottom protective plate includes a tool access opening, and the mounting bracket is fastened to the second surface of the step mounting member fixing bracket by a tool bolt inserted into the tool access opening.

16. A method for providing a bottom protector fastening structure, the method comprising: The bumper assembly is attached to a chassis frame extending along the length of the vehicle body, the bumper assembly including a bumper inner member and a bumper cover attached to the outer side of the bumper inner member; as well as The underbody protector is connected to the inner member of the bumper assembly in a direction perpendicular to the length of the vehicle body. The underbody protector includes an underbody protector mounting assembly connected to the inner member of the bumper and an underbody protection plate connected to the underbody protector mounting assembly. The underbody protector mounting assembly includes: The tubular component extends in a direction perpendicular to the length direction of the vehicle body; Mounting brackets are connected to the tubular component and the bumper inner component; and A bottom protector fixing bracket, the first side of which is connected to the mounting bracket, and the second side of which is welded to the bottom protection plate.

17. The method of claim 16, further comprising: The mounting bracket is connected to the bumper fixing bracket attached to the inner component of the bumper.

18. The method according to claim 16, wherein, The two side edge flanges formed in a direction perpendicular to the surface of the bottom protective plate have variable heights, and the heights increase toward the rear of the vehicle body.

19. The method of claim 16, further comprising: An anti-sagging molding portion is provided, the anti-sagging molding portion being formed on the rear side of the surface of the bottom protective plate, and the anti-sagging molding portion being formed in a zigzag shape in a direction perpendicular to the surface of the bottom protective plate.

20. The method of claim 16, further comprising: A strength-enhancing molding portion is provided, which is formed on each of the two side edges of the surface of the bottom protection plate and protrudes toward the vehicle body in a direction perpendicular to the surface of the bottom protection plate.

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