A platform-based lower body and platform-based seat structure for SD and SUV

Abstract

This invention relates to the field of new energy vehicle technology, and discloses a platform-based lower body and seat structure for SD and SUV models. The lower body structure includes a lower body structure and a seat assembly. The lower body structure includes a front floor sill assembly, a rear floor assembly, and an engine compartment assembly. The front seat front crossbeam assembly in the front floor sill assembly is a different component. The rear panel structure in the rear floor assembly is also a different component. Due to the difference in Z-axis height between SD and SUV models, as well as differences in human seating posture, the upper part of the front fender body, the lower windshield crossbeam assembly, the front vertical panel assembly, the front end structure assembly, the front wheel arch assembly, and the hood hinge mounting plate assembly in the engine compartment assembly are different components. In the seat assembly, the frames of the front seat assembly, the rear seat cushion assembly, and the rear seat back assembly are interchangeable. This invention maximizes the commonality between SD and SUV models while also accommodating the different upper body structures of SD and SUV models.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to a platform-based lower body and seat structure for SD and SUVs. Background Technology

[0002] Currently, both new energy and traditional automakers have deployed multiple models in the R&D and platform development of new energy vehicles, such as Tesla's Model 3 and Model Y, NIO's ET7 and ES7, XPeng's P7 and G9, DeepBlue's SL03 and S7, and Zhiji's L7 and LS7, to meet the needs of different customer groups. A comparison reveals that these automakers share a common characteristic: simultaneously developing multiple models in both the sedan and SUV segments to meet diverse market demands. While a multi-product strategy can increase product coverage and market share, the differentiation and diversification of products also lead to differences in mold development, manufacturing, management, logistics, and production line assembly. This makes it difficult to achieve shared platform development and production across different models, resulting in persistently high development and production costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a platform-based lower body and seat structure for SD and SUV, which can maximize the sharing between SD and SUV while also being compatible with different upper body structures of SD and SUV.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] A platform-based lower body and seat structure for SD and SUV models is disclosed, comprising a lower body structure and a seat assembly. The lower body structure includes a front floor sill assembly, a rear floor assembly, and an engine compartment assembly. The front seat front crossbeam assembly in the front floor sill assembly is a different component. The rear bulkhead structure in the rear floor assembly is a different component. Due to the difference in Z-axis height between SD and SUV models, as well as the difference in human seating posture, the upper part of the front fender body, the lower windshield crossbeam assembly, the front vertical plate assembly, the front end structure assembly, the front wheel arch assembly, and the hood hinge mounting plate assembly in the engine compartment assembly are different components. In the seat assembly, the frames of the front seat assembly, the rear seat cushion assembly, and the rear seat back assembly are interchangeable.

[0006] As a further implementation, the front fender left support plate, front fender right support plate, lower part of the front fender body, anti-collision beam assembly, front longitudinal beam assembly, and front fender crossbeam in the engine compartment assembly are of a common structure.

[0007] As a further implementation, the front floor sill assembly includes sill assemblies on the left and right sides and a front floor body connected between the sill assemblies. The front seat rear crossbeam is also connected between the sill assemblies, and the front seat rear crossbeam is a universal component.

[0008] As a further implementation, the front longitudinal beam cover of the front floor sill assembly adopts a bent V-angle design. The bent slope of the front longitudinal beam cover is welded to the lower part of the front baffle body, and the flat part is welded to the front floor body as a whole. The Y-direction welding positions of the front longitudinal beam cover on both sides are aligned with the front longitudinal beam assembly.

[0009] As a further implementation, the front floor sill assembly includes a W-shaped front baffle and a center channel connecting plate. The front baffle and the center channel connecting plate are located between the upper cover plates of the two sets of front longitudinal beams and are welded to the front floor body. Their rear ends are used for welding to the front seat front crossbeam assembly.

[0010] As a further implementation, the sill assembly includes a left sill assembly and a right sill assembly, with the rear ends of the two sill assemblies connected to a sill reinforcement beam.

[0011] As a further implementation, the rear floor assembly includes a middle floor assembly, which is connected between the rear longitudinal beam assembly and the rear sill inner panel assembly. The front end of the rear longitudinal beam body is connected to the rear sill inner panel assembly, and the front end of the rear sill inner panel assembly is connected to the sill reinforcement beam.

[0012] As a further implementation, the rear floor assembly also includes a rear floor body assembly, the front end of which is welded to the rear end of the middle floor assembly, and the two sides are respectively welded to the internal flange of the rear longitudinal beam assembly. The rear end of the rear longitudinal beam assembly is connected to the rear connecting plate of the rear floor; the rear enclosure structure is connected to the rear side of the rear connecting plate of the rear floor.

[0013] As a further implementation, the front seat bottom frame assembly of the SUV model is an I-beam structure welded from two supporting longitudinal beams and a middle vertical beam. It is used to fix the guide rail of the left front seat assembly to the upper surface of the two longitudinal beams and pre-assemble them into an assembly. It is installed between the front seat front crossbeam assembly and the front seat rear crossbeam assembly. The bottom of the rear seat of the SUV model is installed on the middle floor position of the rear floor assembly through the rear seat bottom frame assembly.

[0014] As a further implementation, the front seat bottom frame assembly of the SUV model is equipped with a front seat bottom frame cover.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. Due to the difference in Z-axis height between SD and SUV models, as well as the difference in human seating posture, the upper part of the front fender body, the lower crossbeam assembly of the front windshield, the front vertical plate assembly, the front structure assembly, the front wheel arch assembly, and the hood hinge mounting plate assembly are considered as different parts in the engine compartment assembly of this invention. In order to match the seat structure, the front seat front crossbeam assembly in the front floor sill assembly is considered as a different part, while other structures are universal. For the rear floor assembly, the rear surround structure is considered as a different part, while other structures are universal. The seat frame in the seat assembly is universal. The above design can maximize the commonality between SD and SUV and match the different upper body structures of SD and SUV.

[0017] 2. The front baffle and the middle channel connecting plate of the present invention are located in the middle of the upper cover plates of the two sets of front longitudinal beams. The cross section adopts a W-shaped structure and is welded to the front floor body. The rear end section is welded to the front side of the front seat front crossbeam assembly to strengthen the front floor body's resistance to front-end compression and form a third transmission path with the front longitudinal beam assemblies on both sides.

[0018] 3. In the SD model of this invention, a front seat inner mounting bracket is welded to the crossbeam body to reinforce the fixing point, adjust the seat posture, and also serve as a fixed connection. The SUV model's front seats have a seat base frame assembly mounting structure and do not require a front seat inner mounting bracket, therefore it is a different component. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0020] Figure 1 This is an isometric schematic diagram of the engine compartment assembly in an embodiment of the present invention;

[0021] Figure 2 This is a top view of the engine compartment assembly in an embodiment of the present invention;

[0022] Figure 3 This is a front view of the engine compartment assembly in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the upper part of the front baffle body in an embodiment of the present invention;

[0024] Figure 5 This is a top view of the front floor threshold assembly in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the upper cover plate of the front longitudinal beam in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the front seat front crossbeam assembly in an embodiment of the present invention;

[0027] Figure 8 This is an isometric schematic diagram of the front floor threshold assembly in an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the rear floor assembly in an embodiment of the present invention;

[0029] Figure 10 This is an isometric structural schematic diagram of the rear floor assembly in an embodiment of the present invention;

[0030] Figure 11 This is a structural schematic diagram of the SUV seat assembly in an embodiment of the present invention;

[0031] Figure 12 This is a schematic diagram of the SD seat assembly in an embodiment of the present invention;

[0032] Figure 13 This is a front view of the SD vehicle seat in an embodiment of the present invention;

[0033] Figure 14 This is an isometric structural diagram of the SUV seat assembly in an embodiment of the present invention.

[0034] Figure 15 This is a structural schematic diagram of the front seat bottom frame assembly in an embodiment of the present invention;

[0035] Figure 16 This is a structural schematic diagram of the rear seat bottom frame assembly in an embodiment of the present invention.

[0036] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0037] The components include: 1. Engine compartment assembly; 2. Front floor sill assembly; 3. Rear floor assembly.

[0038] 11. Upper part of front fender body; 12. Lower crossbeam assembly of front windshield; 13. Left front vertical plate assembly; 14. Right front vertical plate assembly; 15. Left support plate of front fender; 16. Right support plate of front fender; 17. Lower part of front fender body; 18. Front bumper beam assembly; 19. Lower bumper beam assembly; 110. Front end structure assembly; 111. Right front longitudinal beam assembly; 112. Left front longitudinal beam assembly; 113. Right front wheel arch assembly; 114. Left front wheel arch assembly; 115. Right hinge mounting plate assembly of hood; 116. Left hinge mounting plate assembly of hood; 117. Front fender crossbeam; 118. Upper crossbeam assembly of heat pump.

[0039] 21. Front longitudinal beam upper cover plate; 22. Front baffle and center channel connecting plate; 23. Front seat front crossbeam assembly; 24. Battery front center mounting bracket; 25. Airbag ECU mounting plate; 26. Front seat rear crossbeam assembly; 27. Front floor sill assembly; 28. Front floor rear body; 29. ​​Left sill assembly; 210. Right sill assembly; 211. Left sill reinforcement beam assembly; 212. Right sill reinforcement beam assembly.

[0040] 31. Middle floor assembly; 32. Rear right sill inner panel assembly; 33. Rear left sill inner panel assembly; 34. Left rear longitudinal beam assembly; 35. Right rear longitudinal beam assembly; 36. Rear floor body assembly; 37. Rear floor left rear connecting plate; 38. Rear floor storage box assembly; 39. Rear floor right rear connecting plate; 310. Rear floor rear connecting plate; 311. Rear bulkhead inner panel assembly; 312. Rear bulkhead outer panel assembly; 313. Rear bumper beam assembly;

[0041] 41. Left front seat assembly; 42. Right front seat assembly; 44. Left rear seat back assembly; 45. Right rear seat back assembly; 46. Left side cover of left front seat bottom frame; 47. Right side cover of left front seat bottom frame; 48. Left side cover of right front seat bottom frame; 49. Right side cover of right front seat bottom frame; 410. Rear side cover of front seat bottom frame; 411. Front seat bottom frame assembly; 412. Rear seat bottom frame assembly.

[0042] 51. Left front seat assembly, 52. Right front seat assembly, 54. Left rear seat backrest assembly, 55. Right rear seat backrest assembly, 56. Rear seat cushion support assembly. Detailed Implementation

[0043] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0044] Example 1

[0045] In a typical embodiment of the present invention, reference is made to Figures 1-16 As shown, a platform-based lower body and platform-based seat structure for SD and SUV are disclosed, wherein the lower body includes an engine compartment assembly 1, a front floor assembly 2, and a rear floor assembly 3, and the platform-based seat structure is mounted on the floor assembly.

[0046] Specifically, the common components of the engine compartment assembly 1 in the lower body of the pure electric SD and SUV are:

[0047] Front fender left support plate 15 (universal), front fender right support plate 16 (universal), front fender body lower part 17 (universal), front bumper beam assembly 18 (universal), lower bumper beam assembly 19 (universal), right front longitudinal beam assembly 111 (universal), left front longitudinal beam assembly 112 (universal), front fender crossbeam 117 (universal).

[0048] Differences between the engine compartment assembly of the lower body of the pure electric SD and the SUV:

[0049] The front fender body upper part 11 (difference), the front windshield lower crossbeam assembly (difference), the left front vertical plate assembly 13 (difference), the right front vertical plate assembly 14 (difference), the front end structure assembly 110 (difference), the right front wheel arch assembly 113 (difference), the left front wheel arch assembly 114 (difference), the hood right hinge mounting plate assembly 115 (difference), and the hood left hinge mounting plate assembly 116 (difference).

[0050] like Figures 1-4 As shown, the upper part 11 of the front baffle body is made of sheet metal stamping, with both sides bent into obtuse angle structures. The body provides multiple mounting and process holes, from left to right: a round hole for the battery positive terminal harness, a process-shaped weight reduction and reinforcement structure hole, a round hole for the steering intermediate shaft assembly, a round hole for the integrated brake controller assembly, a vertical square water pipe hole for the automatic three-zone air conditioning HVAC assembly, a horizontal waist-shaped air conditioning pipe hole for the automatic three-zone air conditioning HVAC assembly, a horizontal square air intake duct hole for the automatic three-zone air conditioning HVAC assembly, and several process holes and mounting holes. Due to the difference in Z-axis body height between SD and SUV models, as well as the difference in human seating posture (the human seating posture of SUV is higher than that of SD), the position of the intermediate shaft of the steering system differs, so the upper part 11 of the front baffle body is made as a different part.

[0051] The lower windshield crossbeam assembly 12 is a welded body with a semi-circular arc structure formed by pressing and welding the flanges of the upper windshield crossbeam body and the lower windshield crossbeam body. Its two end faces are welded to the left front vertical plate assembly 13 and the right front vertical plate assembly 14, respectively, and its lower end face is welded to the upper part 11 of the front baffle body in the X direction. It has multiple reinforcing ribs on its upper surface and inclined surfaces. The upper surface of the upper windshield crossbeam body has an instrument panel mounting bracket for fixing instrument panel trim, and the lower surface of the lower windshield crossbeam body has a wiper motor mounting bracket and a wiper motor mounting bracket for fixing the front wiper system. Due to differences in human sitting posture, the fitting angle between the windshield glass assembly and the lower windshield crossbeam assembly 12 needs to be adjusted to meet visibility requirements. The angle is larger for SUVs compared to SDs; therefore, the lower windshield crossbeam assembly 12 is a different part.

[0052] The left front vertical plate assembly 13 is welded from top to bottom on the inner side to the front windshield lower crossbeam assembly 12, the upper part of the front fender body 11, the lower part of the front fender body 17, and the left support plate of the front fender assembly 15. On the outer side, from top to bottom, it is welded to the left front wheel arch assembly 114, the middle part of the outer plate of the left front wheel arch upper reinforcing beam, the left sill assembly 29 (general purpose), and the left side panel assembly. The left front vertical plate assembly 13 uses an inward-flanged structure on its top surface to perform XZ-plane normal pressure welding with the front windshield lower crossbeam assembly 12. The left front vertical plate assembly 13 uses an outward-flanged structure on its side surface to perform positive Y-direction fastening welding with the left side panel assembly. The body is strengthened and its weight reduced by using process-cut round and rectangular holes and reinforcing ribs. After adjusting the human sitting posture, in order to meet the comfort of head space, the Z-axis dimension of the SUV cabin is increased. This is achieved by increasing the Z-axis height of the left front vertical plate assembly 13 of the SUV to match and weld with the left side panel assembly of the SUV.

[0053] The right front vertical plate assembly 14 is structurally symmetrical with the left front vertical plate assembly 13, and its connection with other structures is also symmetrically arranged.

[0054] The left support plate 15 of the front baffle (universal) adopts an arc-triangular design. The height of the cross-section increases evenly in the Z-direction, reaching its maximum at the welding and fastening point with the left front vertical plate assembly 13, and its minimum at the welding point with the rightmost part of the lower part of the front baffle body 17. It is staggered and welded to the front baffle crossbeam 117 and the lower part of the front baffle body 17 to form a welded body. This triangular welded body can strengthen the structure and reduce the risk of extrusion deformation and cracking when subjected to compression on the front and left sides. Because the width and longitudinal beams are the same, the left support plate 15 of the front baffle can be used as a universal part for SD and SUV. The right support plate 16 of the front baffle (universal) is symmetrically designed with the left support plate 15 of the front baffle (universal) in terms of structure and connection.

[0055] The lower part 17 of the front baffle body (universal) has two riveting welding holes and mounting holes on the upper part, which are welded and fixed to the front baffle crossbeam 117 by riveting. Increasing the welding point in the middle can improve strength and reduce the risk of cracking. The sides also adopt the same bending angle as the upper part 11 of the front baffle body, forming a triangular bending shape on both sides to ensure that the lower part 17 of the front baffle body and the upper part 11 of the front baffle body are closely welded. The bending structure of the welded body on both sides can reduce the local deformation caused by the compressive force transmitted by the right front longitudinal beam assembly 111 (universal) and the left front longitudinal beam assembly 112 (universal) when the front compartment is compressed. The front baffle body is split into upper and lower parts, with the lower part being universal and the upper part being different to meet the differences in the upper body of SD and SUV.

[0056] The front bumper beam assembly 18 (universal) adopts an arc-shaped rectangular tube structure to meet the three-dimensional curved surface of the front bumper. The rectangular tube has welded reinforcing ribs inside to effectively strengthen the main body structure. Four L-shaped brackets are welded to the upper part for fixing the front bumper body. Two sets of four rivet bolts are provided on the lower sides to fix the front bumper crossbeam mounting connection plate. After connecting with the lower bumper beam assembly 19, it forms a unified structure, effectively increasing the impact area on pedestrian legs and improving pedestrian protection scores. Two rectangular energy-absorbing boxes are welded to both sides of the arc-shaped rectangular tube (several through holes are drilled at the rounded corners of the rectangular tube to bend and weaken the impact energy during a collision). Square mounting end plates are welded to the end faces of the rectangular tube. All these welds together constitute the front bumper beam assembly 18. Each side of the bumper beam end plate has four mounting holes to connect with the right front longitudinal beam assembly and the left front longitudinal beam assembly, thus forming an integrated unit with the vehicle.

[0057] The lower bumper beam assembly 19 (general purpose) adopts an arc-shaped rectangular tube structure to meet the three-dimensional curved surface of the front bumper. Two sets of four rivet bolts are provided on both sides for fixing the front bumper crossbeam mounting connection plate. After connecting with the front bumper beam assembly 18, it forms a unified structure, effectively increasing the impact area on pedestrian legs and improving pedestrian protection scores. Two rectangular energy-absorbing boxes are welded to both sides of the arc-shaped rectangular tube (several through holes are drilled at the rounded corners of the rectangular tube to bend and absorb collision energy during a collision). Triangular mounting end plates are welded to the end faces of the rectangular tube. All these welds together constitute the lower bumper beam assembly 19. Each side of the bumper beam end plate has three mounting holes to connect with the front subframe assembly, thus forming an integrated unit with the vehicle.

[0058] The front-end structural assembly 110 is a plastic frame with a U-shaped outer contour and a V-shaped inner contour. The two sections are thin-walled squares with square holes and four mounting bolts. The front-end structural assembly 110 is fixed in series with the front bumper beam assembly 18, the left front longitudinal beam assembly 112, and the right front longitudinal beam assembly 111 in the X direction by bolts. The directional hole structure design in the middle can ensure that the front bumper beam assembly 18 can be effectively connected with the left front longitudinal beam assembly 112 and the right front longitudinal beam assembly 111. There are two fixing holes in the middle to fix the middle support, so as to fix the middle connection with the front bumper beam assembly 18 and provide support. There are a total of 10 holes on the upper surface. Among the six holes in the middle, four are threaded holes and two are positioning holes, which are used to position and fix the upper grille reinforcement bracket (indirectly fix the front signal light assembly and the front bumper assembly). The two sets of holes on both sides fix the right front headlight assembly and the left front headlight assembly, respectively.

[0059] The front-end structural assembly 110 is fixed in a triangular structure by two sets of eight bolts at both ends and two bolts in the middle. This structure effectively ensures the installation accuracy and position of the right front headlight assembly, left front headlight assembly, front signal light assembly, and front bumper assembly. The inner surface of the front-end structural assembly 110 is secured with a hood locking system to support the hood. Due to the difference in hood height between the SD and SUV models, the hood adjusts accordingly when the SUV's rider posture is raised, resulting in an increased Z-axis height for the front-end structural assembly 110. Therefore, this is a differential component.

[0060] The right front longitudinal beam assembly 111 (general purpose) is a rectangular tube structure formed by welding the right front longitudinal beam body and the right front longitudinal beam cover plate assembly. The opening size in the Y direction at the front end of this welded structure is larger than the opening size at the rear end. The overall structure is an r-shaped structure. By increasing the opening size in the Y direction at the front end, the opening area can be increased, which in turn increases the docking interface area between the front anti-collision beam assembly 18 and the right front longitudinal beam assembly 111 (increasing the cross-section and volume of the energy absorption box), thereby increasing the stress area and improving the energy absorption effect.

[0061] The upper surface of the rectangular structure's front R-end face provides more welding area in the Y direction for the right front longitudinal beam wheel arch connecting beam assembly, increasing the strength of the welded structure. The right front longitudinal beam wheel arch connecting beam assembly provides mounting and fixing points for the right fender. The lower surface of the rectangular structure's front R-end face is welded to the lower surface of the right front longitudinal beam wheel arch connecting beam assembly. The lower surface of the right front longitudinal beam wheel arch connecting beam assembly is embedded with a welded subframe mounting nut seat. The subframe mounting nut seat is connected to the front mounting hole on the right side of the front subframe assembly via bolts. The upper surface of the rectangular welded structure is sequentially provided with mounting holes for the compressor bracket crossbeam base, mounting holes for the high-voltage electric heater bracket, welding plane and weld points for the right front wheel arch assembly 113. The right front longitudinal beam support plate and the right connecting bracket of the front baffle triangular beam are welded to the root of the rear end face of the rectangular structure (the structure is in the shape of an "eight" to effectively fit with the upper part 11 and the lower part 17 of the front baffle body, increasing the stress area to make the stress uniform, and improving the structural strength and the transmission path of the collision force). The right rear mounting reinforcement plate of the front subframe and the right rear mounting reinforcement plate of the front subframe are welded to the root of the rear end face of the rectangular structure, thus welding them to the front baffle crossbeam 117 and the lower part 17 of the front baffle body in a conformal manner, and then welding them to the right sill connecting plate to form the right front longitudinal beam assembly 111. The right front longitudinal beam assembly 111 is welded to the front baffle crossbeam 117 via a groove, forming four welds and diagonal supports at the sloping surface of the lower part 17 of the front baffle body. It is also integrated with the right sill connecting plate through welding. This interlocking and four-sloping-surface support design effectively maintains the strength and rigidity of the longitudinal beam along the X direction. The left front longitudinal beam assembly 112 (general purpose) has the same and symmetrical structure as the right front longitudinal beam assembly 111 (general purpose), and its connection with other structures is also symmetrical to that of the right front longitudinal beam assembly 111 (general purpose), which will not be described further.

[0062] The right front wheel arch assembly 113 is welded together from the right front shock absorber mount (universal), the right front wheel arch side reinforcement beam (universal), the right front wheel arch rear end plate (universal), and the rear part of the right front wheel arch side reinforcement beam (differentiated). The right front shock absorber mount is designed with a protrusion and a structure of oblong holes, large round holes, irregular triangular holes, and mounting bolts. The three evenly distributed oblong mounting holes around the large round holes are fixed to the right front air spring assembly by bolts, which serves to connect the upper and lower body of the vehicle. At the same time, the large round hole in the middle can ensure that the vehicle can withstand bumps or other impacts. To prevent abnormal noises and malfunctions during driving, the right front air spring assembly and right front wheel arch assembly 113 should not collide or interfere with each other due to the downward pressure of the upper body or the upward bounce of the suspension system when going over bumps or other conditions. The irregular triangular holes on the outside of the round holes have the same function as the round holes, preventing collisions or interference with the upper right front control arm assembly and the upper right rear control arm assembly, thus avoiding abnormal noises and malfunctions during driving. The three round mounting holes in the large round hole interior are connected to the heat pump upper crossbeam assembly 118 by bolts, which can improve the torsional rigidity of the entire vehicle. The right front wheel arch assembly 113 is welded to the right front longitudinal beam assembly 111 (universal), the upper part of the front baffle body 11, and the right vertical plate body of the front compartment to form an inverted U-shaped structure with a lower seal. Due to the raised hood, the rear part of the right front wheel arch side reinforcing beam in the right front wheel arch assembly 113 is heightened in the Z direction and welded to the right front vertical plate assembly 14. The remaining components, such as the right front shock absorber mount (universal), the right front wheel arch side reinforcing beam (universal), and the right front wheel arch rear end plate (universal), are also universal. The structure and connection method of the left front wheel arch assembly 114 are symmetrical to those of the right front wheel arch assembly 113.

[0063] The hood right hinge mounting plate assembly 115 features a triangular structure with two bent flanges and a grooved structure. The upper outward flange is welded to the upper surface of the flange of the right front vertical plate assembly 14, while the lower flange is welded to the outer surface of the right front wheel arch rear end plate of the right front wheel arch assembly 113. The vertical surface of the grooved structure is fastened to the hood right hinge mounting bracket assembly with bolts to secure the hood right hinge assembly and the hood. The hood gas spring right mounting bracket and the hood right gas spring assembly are fixed to the outer surface of the main body. Due to the Z-axis height difference between the SD and SUV, and the differences in the Z-axis dimensions and cross-section of the triangular structure, it is a different part. The hood left hinge mounting plate assembly 116 has a structure and connection method symmetrical to the hood right hinge mounting plate assembly 115, and is also a different part.

[0064] The front fender crossbeam 117 (universal) is welded to the lower part of the engine compartment front fender (firewall). It is welded to the left front wheel arch longitudinal beam assembly and the right front wheel arch longitudinal beam assembly to form a welded assembly. Its concave structure design allows for better energy absorption and deformation in frontal and small offset collisions. The crossbeam has a W-shaped structure that fits tightly against the lower part of the front fender body 117 (universal), while the body itself uses a grooved structure to increase its strength. Because the lower part of the front fender body 117 is universal, and the right front longitudinal beam assembly 111 and the left front longitudinal beam assembly 112 are both universal components snapped onto the front fender crossbeam 117 with identical peripheral boundaries, it is a universal component.

[0065] The heat pump upper crossbeam assembly 118 connects the right front wheel arch assembly 113 and the left front wheel arch assembly 114 to connect the left and right sides into a rigid body, which is used to improve the modal rigidity and stiffness of the whole vehicle and has better torsional resistance. It is a differential component.

[0066] The pure electric SD and SUV platform-based lower body front floor sill assembly 2 includes:

[0067] Front longitudinal beam upper cover 21 (universal), front baffle and center channel connecting plate 22 (universal), front seat front crossbeam assembly 23 (differentiated), battery front center mounting bracket 24 (universal), airbag ECU mounting plate 25 (universal), front seat rear crossbeam assembly 26 (universal), front floor body 27 (universal), front floor rear body 28 (universal), left sill assembly 29 (universal), right sill assembly 210 (universal), left sill reinforcement beam assembly 211 (universal), right sill reinforcement beam assembly 212 (universal).

[0068] like Figures 5-8 As shown, the front longitudinal beam upper cover 21 (general purpose) adopts a bent V-angle design, with the bending angle being the same as that of the lower part 17 of the front baffle body. The bent slope of the front longitudinal beam upper cover 21 is welded to the lower part 17 of the front baffle body, and the flat surface of the front longitudinal beam upper cover 21 is welded to the front floor body 27. The front longitudinal beam upper cover 21, the lower part 17 of the front baffle body, and the front floor body 27 are welded to form an integral structure. The Y-direction welding positions of the front longitudinal beam upper cover 21 on both sides are aligned with the Y-direction of the front longitudinal beam assembly, which can effectively transfer the compressive force of the front longitudinal beam assembly from the engine compartment to the middle and rear areas of the vehicle body.

[0069] The front baffle and center channel connecting plate 22 (universal) is located between the upper cover plates 21 of the two sets of front longitudinal beams. Its cross-section adopts a W-shaped structure and is welded to the front floor body 27. The rear end is welded to the front side of the front seat front crossbeam assembly 23, strengthening the front floor body 27's resistance to front-end compression. Together with the left front longitudinal beam assembly 112 and the right front longitudinal beam assembly 111, it forms a third transmission path. The W-shaped groove in the middle increases the welding strength with the front floor body 27. The rear end of the front baffle and center channel connecting plate 22 provides four nut holes for fixing the combined inertial navigation system, and the front end provides two riveted studs for fixing the vehicle domain controller bracket.

[0070] The front seat front crossbeam assembly 23 has a C-shaped groove with a flanged structure. It is fastened to the front floor body 27 and welded, with its front end face spliced ​​and welded to the two sets of front longitudinal beam cover plates 21, the front baffle, and the center channel connecting plate 22. This crossbeam can improve the side compression resistance of the vehicle body and can transmit longitudinal compression forces along three paths. It also provides four fixing points for the left and right front seats. In the SD model, the front seat inner mounting bracket is welded to the crossbeam body to reinforce the fixing point strength, adjust the seat posture, and also serve as a fixing connection. The SUV model's front seats have a seat base frame assembly mounting structure and do not require the front seat inner mounting bracket, so it is a different part.

[0071] The battery is mounted on a bracket 24 (universal) at the front, with its bottom surface welded to the front floor body 27. The rear end is welded to the rear crossbeam assembly 26 of the front seat, and the front end is welded to the front crossbeam assembly 23 of the front seat. The internal cavity has welded nuts for fixing the power battery pack assembly. The internal crossbeam in the middle of the power battery pack assembly is bolted to the lower body to form a rigid body, which improves the side compression resistance.

[0072] The airbag ECU mounting plate 25 (universal) is welded to the front floor body 27 on the bottom surface and to the middle of the front side of the rear crossbeam assembly 26 of the front seat on the rear rear crossbeam assembly. The upper surface has five protrusions and two grooves. The three front protrusions have three welding nuts for fixing the airbag controller assembly, and the two rear protrusions have two welding nuts for fixing the armrest box bracket assembly. The grooves provide installation space.

[0073] The rear crossbeam assembly 26 (universal) of the front seat is welded to the front floor body 27 at its bottom end. Its left and right end faces are welded to the inner surfaces of the left sill assembly 29 and the right sill assembly 210, respectively. Its front end face is welded to the four battery front mounting brackets 24 and the airbag ECU mounting plate 25, with the same number of battery front mounting brackets 24 on both sides of the airbag ECU mounting plate 25. The upper surface of the rear crossbeam assembly 26 (universal) is provided with two sets of four welding nuts and four locating pins for securing the left and right front seat assemblies. The rear crossbeam assembly 26 (universal), together with the front crossbeam assembly 23, bears lateral pressure and strengthens the structure of the front floor body 27, serving to secure and support the weight of the seats, passengers, batteries, fuel tank, etc.

[0074] The front floor body 27 (universal) has the following components welded sequentially from front to back: two front longitudinal beam cover plates 21, front baffle and center channel connecting plate 22, front seat front crossbeam assembly 23, four battery front mounting brackets 24, airbag ECU mounting plate 25, and front seat rear crossbeam assembly 26. The two sides are used for welding to the left front vertical plate assembly 13, right front vertical plate assembly 14, left sill assembly 29 (universal), and right sill assembly 210 (universal). The front end overlaps and is riveted to the lower part 17 of the front baffle body, and the rear end overlaps and is riveted to the rear body 28 of the front floor. Both sides have Z-shaped upward 90° bends and flanges.

[0075] The front floor rear body 28 (universal) overlaps and is riveted to the front floor sill assembly 2 (universal) at its front end. Its two end faces are welded to the left sill assembly 29 (universal), right sill assembly 210 (universal), left sill inner panel rear assembly 33 (universal), and right sill inner panel rear assembly 32 (universal), respectively. Its rear end is press-welded to the middle floor crossbeam assembly, left rear longitudinal beam body, and right rear longitudinal beam body. The front floor rear body 28 has a Z-direction bent flange at the rear end. Adjusting the flange height can accommodate the different Z-direction height requirements of EV batteries and REEV fuel tanks. It also has Z-direction upward 90° bent flanges on both sides. This part is universal for both SD and SUV models, which are both pure electric vehicles.

[0076] The left sill assembly 29 (universal) consists of a left sill connecting plate (with a flanged structure, butt-welded to the left side panel assembly at the lower left corner) and a left sill inner panel body (a C-shaped groove with 90° outward flanged bends on both sides and two 46° bends in the middle) welded together by nesting and pressing. The welded structure is reinforced by adding a left sill inner panel reinforcing plate welded at the second flange and joint. Four holes on the lower surface of the C-shaped groove of the left sill inner panel body correspond to four battery pack mounting reinforcing plate assemblies (with welding nuts for fixing the side surface of the power battery pack assembly). The four fixing points on one side are common for both range extender and pure electric vehicles. A final assembly lifting reinforcing plate is welded to the lower end of the welded body. The right sill assembly 210 (universal) is symmetrically arranged with the left sill assembly 29 (universal).

[0077] The left sill reinforcement beam assembly 211 (general purpose) is connected to the rear end of the left sill assembly 29 (general purpose). Its structure is a rectangular steel beam with two reinforcing vertical ribs inside, cut at a 45° angle at the ends. Four sill connecting plates are evenly distributed on its lower surface. The two middle sill connecting plates are riveted and welded to the lower surface of the left sill reinforcement beam assembly 211 (general purpose), and the two outer sill connecting plates are bolted to the lower surface of the left sill reinforcement beam assembly 211 (general purpose). The left sill reinforcement beam assembly 211 (general purpose) is aligned and welded to the second flange of the left sill assembly 29 (general purpose) via the four sill connecting plates. It is fixed to the upper front side of the left sill assembly 29 (general purpose) via fixing holes and fixing bolts. The right sill reinforcement beam assembly 212 (general purpose) is symmetrically arranged with the left sill reinforcement beam assembly 211 (general purpose).

[0078] Pure electric SD and SUV lower body rear floor assembly 3:

[0079] like Figures 9-10 As shown, the middle floor assembly 31 (general purpose) is welded together with the middle floor crossbeam assembly and the middle floor body assembly. The middle floor crossbeam assembly has a lower flange and an upper flange. The lower flange is welded to the flange of the front floor rear body 28, and the upper flange is welded together with the middle floor body assembly. There are two holes on each side of the middle floor crossbeam assembly, which are fixed to the front flange of the left rear longitudinal beam body and the right rear longitudinal beam body casting respectively by flow drill screws. The two sides of the middle floor body assembly are welded to the left rear longitudinal beam body and the right rear longitudinal beam body respectively and fastened with flow drill screws. The oblique flange of the middle floor assembly 31 is fastened to the rear floor body assembly 36 and the left rear longitudinal beam body and the right rear longitudinal beam body respectively by welding and flow drill screws.

[0080] The rear assembly 32 (general purpose) of the right sill inner panel is embedded and welded into the snap-fit ​​of the right rear longitudinal beam body. The outer flange of the rear assembly 32 (general purpose) of the right sill inner panel is butt-welded to the inner flange of the right side panel assembly. A support bracket is welded to the lower surface of the rear assembly 32 (general purpose) of the right sill inner panel. The rear assembly 33 (general purpose) of the left sill inner panel is symmetrically arranged with the rear assembly 32 (general purpose) of the right sill inner panel.

[0081] The left rear longitudinal beam assembly 34 (general purpose) is connected to the left sill inner panel rear assembly 33 (general purpose) via a front slot and then welded and screwed together. The upper surface of the slot has mounting holes for bolting to the inner surface of the left sill inner panel rear assembly 33 (general purpose) with a projected weld nut. The lower slot has a beveled structure, which is more conducive to absorbing tolerances and makes it easier for the left rear longitudinal beam body (general purpose) and the left sill inner panel rear assembly 33 (general purpose) to be fastened together. The beveled surface of the lower slot of the left rear longitudinal beam body (general purpose) and the beveled surface of the left sill inner panel rear assembly 33 (general purpose) are connected by welding. The honeycomb structure inside the longitudinal beam can effectively increase strength and reduce weight and cost. At the same time, it provides mounting threaded holes on the side. The left sill inner panel rear assembly 33 (general purpose) is fastened to the threaded holes of the internal honeycomb structure of the left rear longitudinal beam body (general purpose) via bolts. The middle section of the main body has a semi-circular arc structure to avoid the left rear tire envelope and meet the clearance requirements between the vehicle and the tire under driving conditions. The internal honeycomb structure reduces weight and provides fixing points for the wheel covers. The rear longitudinal beam of the main body is used to connect to the rear anti-collision beam assembly 313 and support the left rear connecting plate 37 and the rear floor storage box assembly 38. The right rear longitudinal beam assembly 35 (universal) is mainly composed of the right rear longitudinal beam body, and its structural form and corresponding connection form are symmetrically designed with the left rear longitudinal beam assembly 34 (universal).

[0082] The front bend of the rear floor assembly 36 (universal) overlaps and is welded to the rear bend of the middle floor assembly 31, and secured with drilling screws. Its two sides overlap the inner flanges of the left rear longitudinal beam assembly 34 and the right rear longitudinal beam assembly 35, respectively, and are secured with welding and drilling screws. The rear end provides support and fixation for the rear floor storage box assembly 38. The rear floor assembly 36 forms a C-ring reinforcing beam by welding the floor crossbeam body to the left connecting plate assembly of the rear floor crossbeam on the left rear longitudinal beam body and the right connecting plate assembly of the rear floor crossbeam on the right rear longitudinal beam body, thereby improving the torsional strength of the vehicle body at the rear.

[0083] The left rear connecting plate 37 (general purpose) of the rear floor has its front end bent and overlapped with the left rear longitudinal beam body and connected by welding. Its side end overlaps with the left rear longitudinal beam body and is fastened with bolts (sharing a fastening point with the left side flange of the rear floor storage box assembly 38). The rear flange is welded to the rear inner panel assembly 311. The right rear connecting plate 39 (general purpose) of the rear floor has a symmetrical design in terms of structure and connection with the left rear connecting plate 37 (general purpose).

[0084] The rear floor storage box assembly 38 (universal) has its front flange overlapping the upper surface of the rear floor body assembly 36 and secured with bolts. The two side flanges overlap the upper surfaces of the left rear connecting plate 37 (universal) and the right rear connecting plate 39 of the rear floor, respectively, and are secured with bolts. The rear flange overlaps the upper surface of the rear connecting plate 310 of the rear floor and is secured with bolts. The bottom planes of the rear connecting plate 310 (universal) on both sides overlap the upper planes of the left rear connecting plate 37 (universal) and the right rear connecting plate 39 of the rear floor, respectively, and are secured with bolts. The rear flange is welded to the overlapping joint of the rear flanges of the left rear connecting plate 37 (universal) and the right rear connecting plate 39 of the rear floor.

[0085] The rear inner panel assembly 311 has its inner surface welded to the rear end flanges of the left rear connecting plate 37 (universal), the rear connecting plate 310 (universal), and the right rear connecting plate 39 of the rear floor. The left side is bolted between the left rear longitudinal beam assembly 34 and the rear bumper beam assembly 313, and the right side is bolted between the right rear longitudinal beam assembly 35 and the rear bumper beam assembly 313. Due to the need to match and secure the rear bumper body assembly, it is a custom-designed part that follows the rear bumper's overall shape.

[0086] The rear outer panel assembly 312 has two flange structures on the upper and lower sides. The first flange is used to strengthen the body, and the second flange is connected and welded to the flange of the rear inner panel assembly 311. Four rear bumper mounting brackets are welded to the surface of the middle groove to fix the rear bumper assembly. The left side of the welded body of the rear inner panel assembly 311 (universal) and the rear outer panel assembly 312 (universal) is clamped between the left rear longitudinal beam assembly 34 and the rear anti-collision beam assembly 313 and fixedly connected by bolts, and the right side is clamped between the right rear longitudinal beam assembly 35 and the rear anti-collision beam assembly 313 and fixedly connected by bolts. Due to its fit and fixation of the rear bumper body assembly, it is made as a different part to match the rear bumper design.

[0087] The rear bumper beam assembly 313 is constructed by welding together the left rear bumper beam mounting plate (with welded left rear bumper mounting bracket), the right rear bumper beam mounting plate (with welded right rear bumper mounting bracket), the upper rear bumper beam energy-absorbing box, the lower rear bumper beam energy-absorbing box, and the rear bumper beam body (with welded lower left rear bumper mounting bracket). The upper and lower rear bumper beam energy-absorbing boxes are butt-welded together to form a single welded body, which is then welded to the left and right rear bumper beam mounting plates. The two welded bodies are welded to both sides of the internal plane of the rear bumper beam body. The upper and lower rear bumper beam energy-absorbing boxes have oblong and round holes on their upper and lower surfaces, allowing them to deform and absorb energy during rearward compression. Due to its fit and fixation to the rear bumper body assembly, it is a differential component designed to match the rear bumper's overall shape.

[0088] The pure electric SD seat assembly:

[0089] Includes left front seat assembly 51 (universal frame), right front seat assembly 52 (universal frame), rear seat cushion assembly (universal frame), left rear seat backrest assembly 54 (universal frame), right rear seat backrest assembly 55 (universal frame), and rear seat cushion support assembly 56.

[0090] The pure electric SUV seat assembly:

[0091] Includes left front seat assembly 41 (universal frame), right front seat assembly 42 (universal frame), rear seat cushion assembly, left rear seat backrest assembly 44, right rear seat backrest assembly 45, seat bottom frame cover assembly, front seat bottom frame assembly 411, and rear seat bottom frame assembly 412.

[0092] In the SUV seat assembly and SD seat assembly: the left front seat assembly 51 and left front seat assembly 41, the right front seat assembly 52 and right front seat assembly 42, the left rear seat back assembly 54 and left rear seat back assembly 44, the right rear seat back assembly 55 (with a common frame) and the right rear seat back assembly 45 have a common frame structure. Due to the need for foaming to combine the shape effect and color, the remaining parts are made into common parts.

[0093] The rear seat cushion support assembly 56 uses EPP foam to connect the lower body frame and the frame of the rear seat cushion assembly, making it a differentiating component.

[0094] like Figure 14 As shown, in the pure electric SUV seat assembly: the left front seat bottom frame left cover 46, the left front seat bottom frame right cover 47, the right front seat bottom frame left cover 48, and the right front seat bottom frame right cover 49 are added separately for SUV models. These covers are fitted over the longitudinal beams of the front seat bottom frame assembly 411, and their rear ends have a snap-fit ​​structure that engages with the rear cover 410 of the front seat bottom frame. The snap-fit ​​assembly conceals the left front seat bottom frame assembly, improving its aesthetics and preventing the human body from touching the metal structure.

[0095] like Figure 15 As shown, the pure electric SUV seat assembly includes a front seat base frame assembly 411, which is an I-beam structure welded from two supporting longitudinal beams and a central vertical beam. The guide rail of the left front seat assembly (with a universal frame) is fixed to the upper surface of the two longitudinal beams and pre-assembled into an assembly. The lower surface of the front plane of the longitudinal beam of the assembly is fixed to the upper surface of the front crossbeam assembly 23 of the front seat, and the lower surface of the rear plane is fixed to the upper surface of the rear crossbeam assembly 26 of the front seat, thereby fixing it to the lower front floor body 27 of the vehicle body. The seating position of the front passenger can be adjusted by the Z-direction height difference of the supporting longitudinal beams.

[0096] like Figure 16As shown, the rear seat bottom frame assembly 412 is formed by bending a round tube and welding the ends to create a closed "D"-shaped structure. The structure is similar to the perimeter of the rear seat cushion assembly. A straight round tube is welded in the middle to reinforce the torsional strength and rigidity of the D-shaped frame. Fine steel wires are evenly welded inside the bottom frame to enhance its overall structural strength. Flat plates are welded to the wires to secure the seat ventilation blower. Three supports are staggered and welded to two thick round tubes at the front end of the bottom frame. These supports, arranged in an inverted "7" shape, are engaged and fixed to the side and top surfaces of the middle floor beam. Bolts are fixed to the side surfaces (for easy assembly). Three L-shaped supports are fixed to a thick round tube at the rear end of the bottom frame, with their lower surfaces fixed to the lower surface of the middle floor assembly. The seating posture of the second-row passengers can be adjusted by varying the Z-axis height of the supports.

[0097] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A platform-based lower body and platform-based seat structure for SD and SUVs, characterized in that, The vehicle includes a lower body structure and a seat assembly. The lower body structure includes a front floor sill assembly, a rear floor assembly, and an engine compartment assembly. The front seat front crossbeam assembly in the front floor sill assembly is a different component. The rear panel structure in the rear floor assembly is a different component. Due to the difference in Z-axis height between SD and SUV models, as well as the difference in human sitting posture, the upper part of the front fender body, the lower windshield crossbeam assembly, the front vertical plate assembly, the front end structure assembly, the front wheel arch assembly, and the hood hinge mounting plate assembly in the engine compartment assembly are different components. In the seat assembly, the frame of the front seat assembly, the rear seat cushion assembly, and the rear seat back assembly are interchangeable. The front fender left support plate, front fender right support plate, lower part of front fender body, anti-collision beam assembly, front longitudinal beam assembly and front fender crossbeam in the engine compartment assembly are common structures. The front floor sill assembly includes sill assemblies on the left and right sides and a front floor body connected between the sill assemblies. The front seat rear crossbeam is also connected between the sill assemblies. The front seat rear crossbeam is a universal component. The front longitudinal beam cover of the front floor sill assembly adopts a bent V-angle design. The bent slope of the front longitudinal beam cover is welded to the lower part of the front baffle body, and the flat part is welded to the front floor body as a whole. The Y-direction welding positions of the front longitudinal beam cover on both sides are aligned with the front longitudinal beam assembly. The front seat bottom frame assembly of the SUV model is an I-beam structure welded from two supporting longitudinal beams and a middle vertical beam. It is used to fix the guide rail of the left front seat assembly to the upper surface of the two longitudinal beams and pre-assemble them into an assembly. It is installed between the front seat front crossbeam assembly and the front seat rear crossbeam assembly. The bottom of the rear seat of the SUV model is installed on the middle floor position of the rear floor assembly through the rear seat bottom frame assembly.

2. The platform-based lower body and platform-based seat structure for SD and SUVs according to claim 1, characterized in that, The front floor sill assembly includes a W-shaped front baffle and a center channel connecting plate. The front baffle and the center channel connecting plate are located between the upper cover plates of the two sets of front longitudinal beams and are welded to the front floor body. Their rear ends are used for welding to the front seat front crossbeam assembly.

3. The platform-based lower body and platform-based seat structure for SD and SUVs according to claim 1, characterized in that, The door sill assembly includes a left door sill assembly and a right door sill assembly, with the rear ends of the two door sill assemblies connected to door sill reinforcement beams.

4. The platform-based lower body and platform-based seat structure for SD and SUVs according to claim 3, characterized in that, The rear floor assembly includes a middle floor assembly, which is connected between the rear longitudinal beam assembly and the rear sill inner panel assembly. The front end of the rear longitudinal beam body is connected to the rear sill inner panel assembly, and the front end of the rear sill inner panel assembly is connected to the sill reinforcement beam.

5. The platform-based lower body and platform-based seat structure for SD and SUVs according to claim 4, characterized in that, The rear floor assembly includes a rear floor body assembly, the front bending surface of which is welded to the rear bending surface of the middle floor assembly, and the two sides are respectively welded to the internal flange of the rear longitudinal beam assembly. The rear end of the rear longitudinal beam assembly is connected to the rear connecting plate of the rear floor; the rear enclosure structure is connected to the rear side of the rear connecting plate of the rear floor.

6. The platform-based lower body and platform-based seat structure for SD and SUVs according to claim 1, characterized in that, The SUV model's front seat bottom frame assembly is equipped with a front seat bottom frame cover.

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