A seat adapter frame, a vehicle having the same, and a seat assembly installation method

Abstract

The present application relates to the field of automobile seats, in particular to a seat adapter frame, a vehicle with the seat adapter frame and a seat assembly installation method, comprising a cross beam unit and a leg unit; the cross beam unit comprises at least two cross beam bodies; the leg unit comprises a leg structure; the leg structure comprises a front leg structure and a rear leg structure; each cross beam body can be connected to the vehicle floor through the leg structure; the cross beam body can be used to connect the seat assembly to the vehicle floor; the seat adapter frame disclosed in the present application can realize the installation of the seat assembly on the vehicle floor; the seat adapter frame disclosed in the present application can be installed on the vehicle floor first, and then the seat assembly to be installed can be directly placed on the seat adapter frame, so that the installation of the seat assembly is convenient.

Description

Technical Field

[0001] This invention relates to the field of automotive seats, specifically to a seat adapter frame and a method for installing a vehicle and seat assembly having the seat adapter frame. Background Technology

[0002] Currently, there are three-section seat adapter frames on the market. The left and right sections are separate long strip frames connecting the floor and the two mounting points for the left and right front seats. The middle section is a one-piece seat adapter frame connecting the vehicle floor and the other two mounting points for the left and right front seats. This structure is cumbersome to assemble, requiring on-site operators to handle parts three times, wasting time. Furthermore, the left and right front seats are not positioned on the same frame, resulting in an excessively long dimensional chain. This places higher demands on the precision of the holes in the vehicle floor and the seat mounting holes, significantly increasing manufacturing costs.

[0003] Therefore, in order to improve or solve at least one of the above technical problems, it is necessary to optimize and improve the existing seat mounting frame. Summary of the Invention

[0004] The purpose of this invention is to provide a modular adapter frame that facilitates the installation of seat assemblies on the vehicle floor.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A transition frame for a seat includes a crossbeam unit and a leg unit; the crossbeam unit includes at least two crossbeam bodies; the leg unit includes a leg structure; the leg structure includes a front leg structure and a rear leg structure.

[0007] Each of the aforementioned crossbeam bodies can be connected to the vehicle floor via a support structure;

[0008] The crossbeam body can be used to connect the seat assembly to the vehicle floor.

[0009] The front support structure includes a front base and a front mounting mechanism;

[0010] The rear support structure includes a rear base and a rear mounting mechanism;

[0011] The crossbeam body is provided with a connecting structure;

[0012] The front base can be connected to the vehicle floor via a front mounting mechanism; the rear support leg can be connected to the vehicle floor via a rear mounting mechanism; the crossbeam body can be connected to the seat assembly via a connecting structure.

[0013] The connection structure includes a fastening mechanism and a positioning mechanism;

[0014] The fastening mechanism includes fastening holes provided at the ends of the crossbeam body;

[0015] The positioning mechanism includes a positioning hole provided on the crossbeam body; the positioning hole is a round hole or an oblong hole.

[0016] The front mounting mechanism includes a front mounting hole and a front positioning pin; the rear mounting mechanism includes a rear mounting hole; support protrusions are provided at the edges of the front mounting hole and the rear mounting hole; both the front support leg and the rear support leg can be arranged on the vehicle floor through the support protrusions.

[0017] The beam body includes a beam base plate; the beam base plate is provided with a beam side plate on each of its opposite sides.

[0018] The front base includes a front base substrate; the front base substrate is provided with front base side plates on opposite sides;

[0019] The rear base includes a rear base base plate; the rear base base plate is provided with rear base side plates on opposite sides;

[0020] The vertical cross-section of the beam body, the front base and / or the rear base is U-shaped.

[0021] The crossbeam unit also includes a connecting pipe beam; the two ends of the connecting pipe beam are respectively connected to the two crossbeam bodies; the horizontal projection of the crossbeam unit is H-shaped; the crossbeam body is provided with a through groove; the connecting pipe beam passes through the through groove.

[0022] The front base plate and the horizontal projection of the crossbeam body are partially overlapped; the rear base plate and the horizontal projection of the crossbeam body are overlapped; a front clearance arc groove is provided on the front base side plate; a rear clearance arc groove is provided on the rear base side plate; the front clearance arc groove is arranged at the end of the front base side plate away from the rear base and is located on the side of the front base side plate closer to the crossbeam body; the rear clearance arc groove is arranged at the end of the rear base side plate away from the front base and is located on the side of the rear base side plate away from the crossbeam body.

[0023] The front support structure also includes a front reinforcing plate and a bracket baffle; each end of the bracket baffle is connected to a front base side plate; the front reinforcing plate is fitted onto the crossbeam body connected to it;

[0024] The rear support structure includes a rear reinforcing plate, which includes a rear reinforcing base plate. The rear reinforcing base plate includes a reinforcing horizontal plate, a reinforcing vertical plate, and a reinforcing middle plate. The reinforcing middle plate is arranged intersecting with both the reinforcing vertical plate and the reinforcing horizontal plate. The reinforcing horizontal plate is connected to the reinforcing vertical plate through the reinforcing middle plate. The rear reinforcing plate is connected to the crossbeam body through the reinforcing horizontal plate. Each side of the rear reinforcing base plate is connected to a rear base side plate.

[0025] Both the rear reinforcing plate and the crossbeam body are provided with mounting clearance holes; the horizontal projection of the mounting clearance hole covers the horizontal projection of the rear mounting hole on the rear base connected to it; the rear reinforcing plate has a rear reinforcing flange at its edge; the rear reinforcing flange in the rear reinforcing plate is connected to both the crossbeam side plate and the rear base side plate of the crossbeam body; the connecting pipe beam in the crossbeam unit is arranged on the crossbeam body near the front support structure; of the two crossbeam bodies, the positioning hole on one crossbeam body is a round hole, and the positioning hole on the other crossbeam body is an oblong hole.

[0026] A vehicle includes a seat assembly, a vehicle floor, and a seat adapter frame; the seat assembly is connected to the vehicle floor via the seat adapter frame; the vehicle floor has positioning holes; a front positioning pin in the seat adapter frame is inserted into the positioning hole in the vehicle floor; and a positioning pin on the seat assembly is inserted into a positioning hole in the seat adapter frame.

[0027] A method for installing a seat assembly based on the aforementioned seat adapter frame, the method comprising the following steps:

[0028] Step 1: Based on the vehicle floor, determine the seat assembly to be installed; and select the corresponding seat adapter frame;

[0029] Step 2: Connect the seat assembly to be installed to the vehicle floor using the adapter frame;

[0030] First, the adapter frame is installed on the vehicle floor;

[0031] Then install the seat assembly onto the adapter frame.

[0032] The advantages of this invention are:

[0033] This invention discloses a seat adapter frame and a method for installing a vehicle and seat assembly having the seat adapter frame.

[0034] The seat adapter frame disclosed in this invention enables the installation of the seat assembly on the vehicle floor.

[0035] The seat adapter frame disclosed in this invention can be installed on the vehicle floor first, and then the seat assembly to be installed can be placed directly on the seat adapter frame, making the installation of the seat assembly convenient.

[0036] The seat adapter frame of this invention adopts a modular frame design, which has strong assembly flexibility and versatility. Through the split modular design of crossbeam unit + support leg unit (the front support leg structure and the rear support leg structure are connected to the crossbeam body respectively), the support leg structure can be flexibly replaced or adjusted according to the floor hole positions and seat installation point requirements of different models, so as to realize the adaptation of the same crossbeam body to multiple seat assemblies and reduce the cost of re-molding in the development of new models.

[0037] The crossbeam unit adopts an H-shaped horizontal projection layout (two crossbeam bodies are connected as one unit through connecting pipe beams), which not only ensures the structural symmetry and stability of the overall frame, but also ensures the structural strength of the crossbeam unit; and also ensures the integrity of the transition frame for the seat.

[0038] Two crossbeams are respectively equipped with round holes (controlling the X and Y directions of the seat) and oblong holes (controlling only the X direction of the seat), which cooperate with the positioning pins on the seat assembly to achieve self-positioning assembly with a "one main and one secondary" mechanism. At the same time, the front positioning pin on the front support structure inserts into the positioning hole in the vehicle floor to complete the precise alignment of the frame and the floor. The entire process adopts a hole-pin self-positioning method, avoiding the cumulative error of traditional methods that rely on the relative position tolerances of multiple holes, and effectively shortening the dimensional chain.

[0039] The elongated hole design cleverly releases redundant degrees of freedom in the Y direction, avoids assembly interference caused by over-positioning, reduces the manufacturing precision requirements for holes in the vehicle floor and seat mounting holes, reduces rework adjustments caused by positioning deviations, and improves the first-time assembly success rate.

[0040] The vertical cross-sections of the beam body, the front base, and the rear base are all U-shaped, which significantly reduces the weight of a single piece while ensuring bending and torsional stiffness.

[0041] The front support structure is equipped with a bracket baffle (connecting the two front base side plates) and a front reinforcing plate (fitting the crossbeam body) to enhance the front's impact resistance;

[0042] The rear support structure is equipped with a rear reinforcing plate, which is connected to the rear base and the adjacent crossbeam body; thus ensuring the structural strength of the rear end of the seat adapter frame.

[0043] Arc-shaped clearance grooves (front clearance arc groove and rear clearance arc groove) are provided on the front base side plate and the rear base side plate respectively. This not only provides operating space for welding and bolt assembly, but also avoids stress concentration and ensures fatigue life.

[0044] The assembly clearance hole is set on the rear reinforcing plate and the crossbeam body. Its horizontal projection covers the front mounting hole, so that after the frame is welded as a whole, the tool can still be easily inserted through the clearance hole to tighten the front mounting bolts, which solves the problem of assembly inside the closed cavity.

[0045] The design of the support protrusion allows the front and rear support structures to contact the vehicle floor through the raised surface of the support protrusion. The Z-axis positioning is precise and the contact area is controllable, reducing assembly stress caused by uneven floor.

[0046] The step-by-step installation method is clearly defined: first, install the adapter frame to the vehicle floor, then install the seat assembly to the adapter frame. The process logic is clear, which facilitates assembly line operation and improves production efficiency. Attached Figure Description

[0047] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0048] Figure 1 This is an exploded view of the adapter frame for the seat in this invention.

[0049] Figure 2 This is a top view of the seat adapter frame in this invention.

[0050] Figure 3 This is a bottom view of the adapter frame for the seat in this invention.

[0051] Figure 4 This is a schematic diagram of the front support structure in this invention.

[0052] Figure 5 This is a schematic diagram of the rear support structure in this invention.

[0053] Figure 6 This is a schematic diagram of the structure of the seat adapter frame when it is installed on the vehicle floor in this invention.

[0054] Figure 7 for Figure 6 A partial sectional view.

[0055] Figure 8 This is a schematic diagram of the structure when the seat adapter frame is connected to the seat assembly in this invention.

[0056] Figure 9 for Figure 8 A partial sectional view.

[0057] Figure 10 This is a schematic diagram of the structure of the seat assembly of the present invention when it is connected to the vehicle floor via a seat adapter frame.

[0058] The markings in the above figures are all:

[0059] 1-1. Seat adapter frame; 1-2. Vehicle floor; 1-3. Seat assembly. Detailed Implementation

[0060] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0061] A seat adapter frame 1-1 includes a crossbeam unit and a leg unit. The crossbeam unit facilitates the connection between the seat assembly 1-3 and the adapter frame 1-1, while the leg unit is mainly used for the installation connection between the crossbeam unit and the vehicle floor 1-2.

[0062] In this invention, the crossbeam unit includes at least two crossbeam bodies 1; the two crossbeam bodies 1 extend along the X direction of the vehicle; the support leg unit includes a support leg structure; the support leg structure includes a front support leg structure and a rear support leg structure; the front support leg structure and the rear support leg structure are used to provide longitudinal support for the crossbeam bodies 1; in this invention, each of the crossbeam bodies 1 can be connected to the vehicle floor 1-2 through the support leg structure; the crossbeam bodies 1 can be used to connect the seat assembly 1-3 to the vehicle floor 1-2.

[0063] The seat adapter frame 1-1 disclosed in this invention has an overall frame structure, mainly including a crossbeam unit and a support unit. The crossbeam unit includes a first crossbeam body 1 and a second crossbeam body 1 arranged at intervals along the width direction of the vehicle, and the two are fixedly connected by a connecting tube beam 4. The support unit includes a front support structure and a rear support structure, which are respectively disposed at the lower front end and the lower rear end of the crossbeam body 1, and each crossbeam body 1 is equipped with a corresponding set of front support structure and rear support structure.

[0064] The specific connection relationships between the components are as follows: The crossbeam body 1 is a U-shaped stamped part, with its lower front end fixedly connected (welded) to the front base 201 in the front support structure, and its lower rear end fixedly connected to the rear base 301 in the rear support structure. Both the front base 201 and the rear base 301 adopt a U-shaped cross-section structure, with their opening directions opposite to those of the crossbeam body 1; the crossbeam body 1 opens downwards, while the front base 201 and the rear base 301 open upwards.

[0065] In actual installation, the crossbeam body 1 is equivalent to being inserted into the corresponding front base 201 and rear base 301.

[0066] The two ends of the connecting tube beam 4 (square tube structure) are respectively inserted into the corresponding through slots 13 opened on the two crossbeam bodies 1, and are fixedly connected to the crossbeam bodies 1 by welding, so that the horizontal projection of the crossbeam unit is H-shaped.

[0067] The upper surface of the crossbeam body 1 is provided with a connecting structure, including a fastening mechanism (fastening hole 14; a welding nut can be added to the fastening hole 14; of course, the welding nut can also be set on the front reinforcing plate 6 or the rear reinforcing plate 5 instead of the crossbeam body 1) and a positioning mechanism (round hole / oblong hole), which are respectively used to connect with the mounting bolts and positioning pins of the seat assembly 1-3.

[0068] The front base 201 has a front mounting hole 214 and a front locating pin 216, and the rear base 301 has a rear mounting hole. Support protrusions 215 are provided at the edges of the front and rear mounting holes. The front locating pin 216 is inserted into the locating hole 15 of the vehicle floor 1-2 to achieve XY-axis positioning. All the surfaces of the support protrusions 215 abut against the vehicle floor 1-2 to achieve Z-axis positioning. The mounting bolts pass through the mounting holes and are tightened with the welded nuts on the vehicle floor 1-2 to secure the vehicle.

[0069] In this invention, the connecting structure is set on the crossbeam body 1 to achieve a quick and precise connection between the seat assembly 1-3 and the adapter frame 1-1. It includes two functional modules: a fastening mechanism and a positioning mechanism. The two are arranged adjacent to each other in space and cooperate sequentially in function to complete the installation of the seat assembly 1-3.

[0070] The connection structure described in this invention includes a fastening mechanism and a positioning mechanism. The fastening mechanism includes fastening holes 14 located at the ends of the crossbeam body 1. Specifically, each crossbeam body 1 has a fastening hole 14 at both its front and rear ends, and the fastening hole 14 is a circular through hole. The fastening hole 14 is used for the mounting bolts of the seat assembly 1-3 to pass through. After the mounting bolts are inserted into the fastening hole 14 from above, they are tightened, thereby achieving a mechanical fixed connection between the seat assembly 1-3 and the crossbeam body 1.

[0071] The fastening holes 14 are located at the ends of the crossbeam body 1, that is, near the front support structure and the rear support structure, and are generally located above the front support structure or the rear support structure.

[0072] The positioning mechanism includes a positioning hole 15 provided on the crossbeam body 1. The positioning hole 15 is a circular or oblong through hole that penetrates the crossbeam base plate 11. In the two crossbeam bodies 1, the positioning hole 15 on one crossbeam body 1 is a circular hole, and the positioning hole 15 on the other crossbeam body 1 is an oblong hole, with the length of the oblong hole extending along the width direction of the vehicle.

[0073] The round hole serves as the main positioning hole 15 of the seat assembly 1-3, which cooperates with the main positioning pin on the seat assembly 1-3 to simultaneously constrain the X-direction (vehicle length direction) and Y-direction (vehicle width direction) displacement of the seat assembly 1-3, thereby achieving precise positioning.

[0074] The elongated hole serves as the secondary positioning hole 15 of the seat assembly 1-3, cooperating with the secondary positioning pin on the seat assembly 1-3. It only restricts the X-direction displacement of the seat assembly 1-3, while allowing the positioning pin to slide freely in the elongated hole in the Y-direction, thus releasing the Y-direction degree of freedom.

[0075] Positioning holes 15 and fastening holes 14 are arranged at intervals on the crossbeam body 1. Typically, the positioning holes 15 are located in the middle area of ​​the crossbeam body 1 or between two fastening holes 14, so that when the seat assembly 1-3 is lowered, its position is first determined by the positioning holes 15, and then it is fixed and locked by the fastening holes 14. The positioning holes 15 take precedence over the fastening holes 14 in the assembly process.

[0076] The fastening mechanism and the positioning mechanism form a “positioning first, fastening later” assembly logic collaboration on the crossbeam body 1: positioning guides fastening: the positioning hole 15 completes the engagement with the seat positioning pin during the descent of the seat assembly 1-3, so that the seat assembly 1-3 is already limited to the correct XY position before it contacts the crossbeam body 1. Subsequently, when the fastening bolt is inserted into the fastening hole 14, there is no need for manual alignment, and the bolt is naturally aligned, which greatly shortens the assembly cycle.

[0077] After the fastening bolts are tightened, the seat assembly 1-3 is firmly pressed against the upper surface of the crossbeam body 1. At this time, the positioning pin remains inserted in the positioning hole 15. The clearance between the two is eliminated by the fastening force, and the positioning accuracy is maintained without being lost due to vibration or displacement during use.

[0078] In this invention, the front mounting mechanism includes a front mounting hole 214 and a front positioning pin 216; the rear mounting mechanism includes a rear mounting hole; support protrusions 215 are provided at the edges of the front mounting hole 214 and the rear mounting hole; both the front support leg and the rear support leg can be arranged on the vehicle floor 1-2 via the support protrusions 215; the front mounting mechanism is mainly arranged on the front support leg structure; the rear mounting mechanism is arranged on the rear support leg structure. It is mainly used to achieve the connection and fixation between the adapter frame 1-1 and the vehicle floor 1-2.

[0079] The front mounting mechanism includes a front mounting hole 214 and a front locating pin 216. The front mounting hole 214 is a circular through hole formed on the front base plate 211, used for mounting bolts to pass through and fix the front support structure to the vehicle floor 1-2. The front locating pin 216 is fixedly disposed on the lower surface of the front base plate 211, with its axis extending vertically, for insertion into the corresponding locating hole 15 on the vehicle floor 1-2. The fit between the front locating pin 216 and the locating hole 15 on the vehicle floor 1-2 is a clearance fit, ensuring both smooth insertion and sufficient positioning accuracy.

[0080] The rear mounting mechanism includes a rear mounting hole. This rear mounting hole, a circular through hole, is located on the rear base plate 311 and is used for mounting bolts to pass through in order to secure the rear support structure to the vehicle floor 1-2. The rear mounting mechanism does not have locating pins; it only provides a passage for the mounting bolts.

[0081] Support protrusions 215 are provided at the edges of the front mounting hole 214 and the rear mounting hole, respectively. Each support protrusion 215 is an annular boss structure surrounding the mounting hole, with a flat support surface at its lower end. The support protrusion 215 and the base plate are integrally stamped, with the support protrusion 215 protruding downwards from the lower surface of the base plate. When the front and rear support leg structures are positioned on the vehicle floor 1-2, the lower end surface of the support protrusion 215 directly contacts the upper surface of the vehicle floor 1-2, while other areas of the base plate maintain a gap with the vehicle floor 1-2.

[0082] The lower end face of the support protrusion 215 forms the Z-direction mounting reference surface of the frame on the vehicle floor 1-2. The height of this reference surface is precisely controlled by the protrusion height of the support protrusion 215, ensuring that the four support points of the frame are at the same horizontal height.

[0083] Compared to the base plate making full-surface contact, the support protrusion 215 limits the contact area to an annular area around the mounting hole, reducing the contact area with the floor and decreasing the sensitivity to the flatness of the floor surface.

[0084] Meanwhile, the support protrusion 215 can also increase the structural strength around the front mounting hole 214 or the rear mounting hole.

[0085] Furthermore, in this invention, the beam body 1 includes a beam base plate 11; the beam base plate 11 is provided with a beam side plate 12 on each of its opposite sides; based on the arrangement of the beam base plate 11 and the two beam side plates 12, the beam body 1 forms an inverted U-shaped structure, which ensures the structural strength of the beam body 1.

[0086] Similarly, in this invention, the front base 201 includes a front base substrate 211; the front base substrate 211 is provided with front base side plates 212 on both sides; the rear base 301 includes a rear base substrate 311; the rear base substrate 311 is provided with rear base side plates 312 on both sides; the vertical cross section of the crossbeam body 1, the front base 201 and / or the rear base 301 is U-shaped; based on the above design, the front base 201 and the rear base 301 also have good structural strength.

[0087] In this invention, the crossbeam unit also includes a connecting pipe beam 4; the two ends of the connecting pipe beam 4 are respectively connected to the two crossbeam bodies 1; the horizontal projection of the crossbeam unit is H-shaped; the crossbeam body 1 is provided with a through groove 13; the connecting pipe beam 4 passes through the through groove 13; the connecting pipe beam 4 acts as a reinforcing beam, ensuring the structural strength of the crossbeam unit, and also acts as a connector, facilitating the connection between the left and right crossbeam bodies 1; facilitating subsequent overall transportation and subsequent installation.

[0088] In this invention, the crossbeam body 1 is a long strip structure made of high-strength steel plate by integral stamping. The crossbeam body 1 includes a crossbeam base plate 11 and crossbeam side plates 12 respectively disposed on opposite sides of the crossbeam base plate 11. The crossbeam base plate 11 is a horizontally extending flat plate, with its width direction arranged along the width direction of the vehicle and its length direction arranged along the length direction of the vehicle. The upper surface of the crossbeam base plate 11 is used to support the seat assembly 1-3, and the lower end or side is used to connect with the leg structure. The two crossbeam side plates 12 are bent downward from the opposite edges of the crossbeam base plate 11 in the width direction, and the included angle between the crossbeam side plates 12 and the crossbeam base plate 11 is a right angle, so that the vertical cross section of the crossbeam body 1 is U-shaped, with the U-shaped opening facing downward.

[0089] The U-shaped cross-section design optimizes the mechanical properties of the crossbeam body 1 in terms of material distribution. The crossbeam base plate 11 serves as the main load-bearing surface, bearing the vertical compressive load transmitted by the seat assembly 1-3; the two crossbeam side plates 12 act as reinforcing flanges, significantly improving the bending section modulus of the crossbeam body 1 along the vehicle's length and its torsional section constant in the horizontal plane. Compared to a flat plate structure of the same width and thickness, the bending stiffness of the U-shaped cross-section is increased several times.

[0090] The front base 201 is a support component integrally stamped from high-strength steel plate, and it is located at the lower front end of the crossbeam body 1. The front base 201 includes a front base base plate 211 and front base side plates 212 respectively disposed on opposite sides of the front base base plate 211. The front end of the front base base plate 211 protrudes forward beyond the front end face of the crossbeam body 1, and the rear end of the front base base plate 211 is embedded below the crossbeam body 1, so that the front base base plate 211 and the crossbeam base plate 11 form a partially overlapping area in the horizontal projection. The two front base side plates 212 bend upward from the opposite edges of the front base base plate 211 in the width direction, and the included angle between the front base side plates 212 and the front base base plate 211 is a right angle. Therefore, the vertical cross section of the front base 201 is U-shaped, with the U-shaped opening facing upward.

[0091] The rear base 301 is a support component integrally stamped from high-strength steel plate, and it is located at the lower rear end of the crossbeam body 1. The rear base 301 includes a rear base base plate 311 and rear base side plates 312 respectively disposed on opposite sides of the rear base base plate 311. The horizontal projection of the rear base base plate 311 completely coincides with the horizontal projection of the crossbeam body 1, that is, the front end of the rear base base plate 311 does not exceed the front end of the crossbeam body 1 and the rear end does not exceed the rear end of the crossbeam body 1 in the vehicle length direction, and the entire rear base plate 311 is located directly below the crossbeam body 1; this arrangement...

[0092] In addition to ensuring the strength of the rear support structure, it also reduces the space occupied by the rear support structure in the second row, thus maximizing the foot space for getting in and out of the vehicle.

[0093] In this invention, the two rear base side plates 312 bend upward from the opposite side edges of the rear base substrate 311 in the width direction, and the included angle between the rear base side plates 312 and the rear base substrate 311 is a right angle, so that the vertical cross section of the rear base 301 is U-shaped with the U-shaped opening facing upward.

[0094] The vertical cross-section of the beam body 1 is U-shaped with the opening facing downwards, and the vertical cross-section of the front base 201 and the rear base 301 is U-shaped with the opening facing upwards; this arrangement facilitates the insertion and placement of the beam body 1 on the corresponding front base 201 and rear base 301.

[0095] The front base plate 211 of the front base 201 and the crossbeam plate 11 partially overlap in the horizontal projection, and the front base side plate 212 and the crossbeam side plate 12 are partially overlapped and welded. The rear base plate 311 of the rear base 301 and the crossbeam plate 11 completely overlap in the horizontal projection, and the rear base side plate 312 and the crossbeam side plate 12 are partially overlapped and welded in the vertical direction in the rear end area. Based on the above design, the connection between the crossbeam body 1 and the front base 201 and the rear base 301 is facilitated.

[0096] The crossbeam unit also includes a connecting tube beam 4. The connecting tube beam 4 is a square tube structure with a rectangular or square cross-section and a wall thickness of 1.5-3.0 mm. The square tube material is high-strength steel. The length of the connecting tube beam 4 extends along the width of the vehicle, and its two ends are respectively connected to the first crossbeam body 1 and the second crossbeam body 1. Specifically, the connecting tube beam 4 is inserted into the through slot 13 of the crossbeam side plate 12, and then welded to achieve the connection between the connecting tube beam 4 and the crossbeam body 1.

[0097] A through slot 13 is provided on the crossbeam body 1, specifically formed on the crossbeam side plate 12 of the crossbeam body 1. The through slot 13 is a rectangular through slot that penetrates the inner and outer surfaces of the crossbeam side plate 12. The dimensions of the through slot 13 match the cross-sectional dimensions of the connecting pipe beam 4. The height of the through slot 13 is slightly greater than the height of the connecting pipe beam 4, and the width is slightly greater than the width of the connecting pipe beam 4, forming a clearance fit between them. The two ends of the connecting pipe beam 4 are respectively inserted into the through slots 13 on the corresponding crossbeam body 1. That is, the left end of the connecting pipe beam 4 passes through the through slots 13 on the two crossbeam side plates 12 of the left crossbeam body 1, and the right end of the connecting pipe beam 4 passes through the through slots 13 on the two crossbeam side plates 12 of the right crossbeam body 1. After the end of the connecting pipe beam 4 passes through the through groove 13, its outer wall is fixed to the inner wall of the through groove 13 by a circumferential fillet weld. The welding position is located on the outer side of the beam side plate 12, and the welding gun can be horizontally extended from the outside of the beam side plate 12 to complete the welding operation.

[0098] After the connecting tube beam 4 passes through the through slot 13, the horizontal projection of the crossbeam unit is H-shaped. Specifically, the two crossbeam bodies 1 form two longitudinal arms of the H-shape, which are arranged parallel and spaced apart along the vehicle width direction; the connecting tube beam 4 forms a transverse connecting arm of the H-shape, with its two ends connecting to the middle and front regions of the two longitudinal arms respectively. The H-shaped horizontal projection layout provides lateral constraint to the crossbeam unit in the vehicle width direction. The relative displacement between the two crossbeam bodies 1 (including separation or proximity in the width direction and forward and backward displacement in the length direction) is effectively limited by the connecting tube beam 4. Thus, the two independent crossbeam bodies 1 are integrated into a rigid whole, ensuring the integrity of the seat adapter frame 1-1.

[0099] In this invention, the crossbeam body 1 extends along the length of the vehicle, and its U-shaped cross-section provides excellent longitudinal bending stiffness, enabling the longitudinal inertial force generated by the seat assembly 1-3 during vehicle acceleration and braking to be effectively borne by the crossbeam body 1 without excessive bending deformation. The connecting tube beam 4 extends along the width of the vehicle, and its square tube cross-section provides excellent lateral tensile and compressive stiffness, enabling the lateral inertial force generated by the seat assembly 1-3 during vehicle cornering to be transmitted and balanced between the left and right crossbeam bodies 1 through the connecting tube beam 4.

[0100] The connecting tube beam 4 is arranged in the front third section of the crossbeam body 1. This arrangement can increase the foot space for passengers in the second row or rear seats to a greater extent.

[0101] In this invention, the front base plate 211 and the crossbeam body 1 are horizontally projected to coincide; the rear base plate 311 and the crossbeam body 1 are horizontally projected to coincide. Specifically, the front base plate 211 extends along the length of the vehicle, with its front end protruding forward beyond the front end face of the crossbeam body 1, and its rear end extending backward to the area below the front end of the crossbeam body 1. The width of the front base plate 211 in the vehicle width direction is basically the same as the width of the crossbeam plate 11, and their width edges are aligned with each other. In horizontal projection, the rear region of the front base plate 211 overlaps with the front region of the crossbeam body 1, and the overlapping region is 40%-60% of the total length of the front base plate 211 along the length of the vehicle; the front region of the front base plate 211 extends forward beyond the crossbeam body 1 and is a non-overlapping region. This arrangement can ensure the stable support of the bottom base for the crossbeam body 1 while minimizing interference between the crossbeam body 1 and the fastener installation of the front base 201.

[0102] The front end of the front base plate 211 protrudes forward from the crossbeam body 1, allowing the front mounting hole 214 to be positioned in front of the crossbeam body 1. The mounting bolts are located vertically outside the crossbeam body 1, and the bolt heads and tightening tools are not obstructed by the space of the crossbeam body 1, allowing direct operation from above. Simultaneously, the rear end of the front base plate 211 overlaps the crossbeam body 1 with sufficient area, ensuring that the welded connection between the two has adequate weld length and strength, enabling the front base 201 to reliably bear the load from the crossbeam body 1.

[0103] The rear base plate 311 and the crossbeam body 1 are completely overlapped in horizontal projection. Specifically, the crossbeam body 1 is positioned directly above the rear base 301; there is no portion extending rearward beyond the crossbeam body 1. Based on the above design, the rear base 301 can be prevented from protruding beyond the crossbeam body 1 and additionally occupying rear passenger foot space.

[0104] Additionally, in this invention, the front base side plate 212 is provided with a front clearance arc groove 202; the rear base side plate 312 is provided with a rear clearance arc groove 302; the front clearance arc groove 202 is arranged at the end of the front base side plate 212 away from the rear base 301, and is located on the side of the front base side plate 212 close to the crossbeam body 1; the rear clearance arc groove 302 is arranged at the end of the rear base side plate 312 away from the front base 201, and is located on the side of the rear base side plate 312 away from the crossbeam body 1; the front clearance arc groove 202 is provided on the front base side plate 212. The front base side plate 212 is a vertical plate structure that extends from the front end to the rear end of the front base base plate 211 along the length direction of the vehicle. The front clearance arc groove 202 is an arc-shaped notch formed by the indentation from the upper edge of the front base side plate 212 downwards. The notch is arc-shaped. The front clearance arc groove 202 plays a good role in reducing material and avoiding obstruction, which facilitates the subsequent tightening or disassembly of bolts on the front base 201 and seat assembly 1-3.

[0105] The rear clearance arc groove 302 is located at the rear end of the rear base side plate 312 and is located on the side close to the vehicle floor 1-2. Based on this design, a notch can be formed below the rear end of the rear base side plate 312 to facilitate the operation of the fastening bolts at the rear end of the seat assembly 1-3.

[0106] Furthermore, the front support structure described in this invention also includes a front reinforcing plate 6. The front reinforcing plate 6 is mainly arranged below the front end of the corresponding crossbeam body 1, and a welding nut is provided on the front reinforcing plate 6, mainly to facilitate the subsequent locking and fixing of the seat assembly 1-3 with bolts. In this invention, the bracket baffle 213 mainly plays a connecting role. In this invention, the bracket baffle 213 is connected to a front base side plate 212 at both ends. Based on this design, the bracket baffle 213 plays a good connecting role and ensures the integrity of the two front base side plates 212. Based on the above design, the front base base plate 211, the two front base side plates 212 and the bracket baffle 213 of this invention form a box-shaped structure, which effectively ensures the overall structural strength of the front support structure.

[0107] In this invention, the front reinforcing plate 6 is attached to the crossbeam body 1 connected thereto; generally, welding is used to connect them.

[0108] The front reinforcing plate 6 is located below the fastening hole 14 of the crossbeam body 1, and has a welded nut on it. The welded nut is located at the end of the front reinforcing plate 6 away from the crossbeam body 1, i.e., below. The front reinforcing plate 6 is a flat or bent plate-shaped component formed by stamping high-strength steel plate, and its plate shape matches the cross-sectional profile of the front end of the crossbeam body 1. The front reinforcing plate 6 is attached to the crossbeam body 1 to which it is connected. Specifically, the front reinforcing plate 6 is attached to the area of ​​the crossbeam body 1 near the front support structure. The crossbeam body 1 has a U-shaped cross-section in this area, i.e., the crossbeam base plate 11 and the two side crossbeam plates 12 together form an upward-opening U-shaped space. The front reinforcing plate 6 includes a horizontal attachment part and a vertical attachment part. The horizontal attachment part is attached to the lower surface of the crossbeam base plate 11, and the vertical attachment part is attached to the inner or outer surface of the crossbeam side plate 12. The front reinforcing plate 6 is fixedly connected to the crossbeam body 1 through multiple discrete welding points or continuous welds.

[0109] A bracket baffle 213 is disposed at the front support leg structure and is used to connect the two front base side plates 212 of the front base 201. The bracket baffle 213 has a flat plate structure and is disposed perpendicular to the front base base plate 211 and also perpendicular to the front base side plates 212. The bracket baffle 213 is connected to the two front base side plates 212 by welding, with the left and right ends of the bracket baffle 213 respectively connected to the front base side plates 212; it is fixed by fillet welds or butt welds.

[0110] The rear support structure described in this invention includes a rear reinforcing plate 5, which is mainly used to ensure the structural strength between the rear end of the crossbeam body 1 and the rear base 301.

[0111] In this invention, the rear reinforcing plate 5 includes a rear reinforcing base plate; the rear reinforcing base plate is the main structure of the rear reinforcing plate 5, and in this invention, the rear reinforcing base plate includes a reinforcing horizontal plate 51, a reinforcing vertical plate 53, and a reinforcing middle plate 52; the reinforcing middle plate 52 is arranged intersecting with the reinforcing vertical plate 53 and the reinforcing horizontal plate 51; the overall design of this invention is similar to an L-shape; the reinforcing horizontal plate 51 is connected to the reinforcing vertical plate 53 through the reinforcing middle plate 52; the rear reinforcing plate 5 is connected to the crossbeam body 1 through the reinforcing horizontal plate 51; the two sides of the rear reinforcing base plate are respectively connected to a rear base side plate 312;

[0112] The rear reinforcing base plate is a plate-shaped component formed by integral stamping of high-strength steel plate. Its overall shape is irregular planar and consists of three functional areas: reinforcing horizontal plate 51, reinforcing vertical plate 53, and reinforcing middle plate 52.

[0113] The reinforcing cross plate 51 is one of the main areas of the rear reinforcing base plate. It is a horizontal strip that extends along the width of the vehicle. The upper surface of the reinforcing cross plate 51 is flat and is used to fit and connect with the lower surface of the crossbeam body 1.

[0114] The reinforcing longitudinal plate 53 is another main area of ​​the rear reinforcing base plate. The reinforcing longitudinal plate 53 is arranged vertically and is mainly inserted into the rear base 301.

[0115] The reinforcing middle plate 52 serves as a transitional connection area for the rear reinforcing substrate. It is shaped like an inclined or bent plate and intersects with both the reinforcing longitudinal plate 53 and the reinforcing transverse plate 51. The reinforcing middle plate 52 is located at the junction of the reinforcing transverse plate 51 and the reinforcing longitudinal plate 53. One edge of the reinforcing middle plate 52 connects to the edge of the reinforcing transverse plate 51, and the other edge connects to the edge of the reinforcing longitudinal plate 53. The reinforcing transverse plate 51 is connected to the reinforcing longitudinal plate 53 via the reinforcing middle plate 52. The angle between the reinforcing middle plate 52 and the reinforcing transverse plate 51 is 90°-150°, and the angle between the reinforcing middle plate 52 and the reinforcing longitudinal plate 53 is also 90°-150°. Together, they form a continuous plate-like structure that intersects in three directions within a plane.

[0116] The rear reinforcing plate 5 is connected to the crossbeam body 1 via a reinforcing cross plate 51. Specifically, the upper surface of the reinforcing cross plate 51 is in close contact with the lower surface of the crossbeam base plate 11, and the contact surface between the two is planar. The contact area is determined by the length and width of the reinforcing cross plate 51. The reinforcing cross plate 51 and the crossbeam base plate 11 are fixedly connected by welding. The welding method is either a continuous fillet weld arranged along the edge of the reinforcing cross plate 51 or multiple weld points arranged at intervals. The two ends of the reinforcing cross plate 51 in the vehicle width direction can extend to the position of the crossbeam side plate 12 of the crossbeam body 1. At this time, the edge of the reinforcing cross plate 51 can also be welded to the inner wall of the crossbeam side plate 12 to further improve the connection strength.

[0117] The two sides of the rear reinforcing base plate are respectively connected to a rear base side plate 312. Specifically, the opposite two sides of the reinforcing longitudinal plate 53 in the vehicle width direction are in contact with the inner walls of the left rear base side plate 312 and the right rear base side plate 312, respectively, and the opposite two sides of the reinforcing middle plate 52 in the vehicle width direction are also in contact with the inner walls of the left rear base side plate 312 and the right rear base side plate 312, respectively.

[0118] Furthermore, in this invention, both the rear reinforcing plate 5 and the crossbeam body 1 are provided with mounting clearance holes 55; the horizontal projection of the mounting clearance hole 55 covers the horizontal projection of the rear mounting hole on the rear base 301 to which it is connected; the mounting clearance hole 55 is provided to facilitate the fasteners to pass through the crossbeam body 1 and connect with the rear reinforcing plate 5 and the rear mounting hole on the rear base 301.

[0119] In this invention, a rear reinforcing flange 54 is provided at the edge of the rear reinforcing substrate; the rear reinforcing flange 54 increases the contact area between the rear reinforcing substrate and the adjacent components, thereby better ensuring the stability of the connection between the rear reinforcing plate 5 and the adjacent components.

[0120] In this invention, the rear reinforcing flange 54 in the rear reinforcing plate 5 is connected to both the crossbeam side plate 12 of the crossbeam body 1 and the rear base side plate 312. With this arrangement, the rear reinforcing flange 54 also acts as a connector, which better ensures the stability of the connection between the crossbeam body 1 and the rear base 301.

[0121] In this invention, the connecting tube beam 4 in the crossbeam unit is arranged on the crossbeam body 1 near the front support structure; this arrangement can increase the foot space for rear passengers.

[0122] In this invention, among the two crossbeam bodies 1, the positioning hole 15 on one crossbeam body 1 is a round hole, and the positioning hole 15 on the other crossbeam body 1 is an oblong hole; the round hole positioning hole 15 is the main positioning hole 15, and the oblong hole positioning hole 15 is the auxiliary positioning hole 15. The combined use of the above two types of holes can realize the positioning of the seat assembly 1-3, and also reduce the assembly difficulty of the seat assembly 1-3 on the adapter frame 1-1.

[0123] A vehicle includes a seat assembly 1-3, a vehicle floor 1-2, and a seat adapter frame 1-1. The seat assembly 1-3 is connected to the vehicle floor 1-2 via the seat adapter frame 1-1. The vehicle floor 1-2 has positioning holes 15. A front positioning pin 216 in the seat adapter frame 1-1 is inserted into the positioning hole 15 in the vehicle floor 1-2. A positioning pin on the seat assembly 1-3 is inserted into the positioning hole 15 in the seat adapter frame 1-1. The seat assembly 1-3 may be a front seat (driver's seat or front passenger seat), and its lower part has a positioning pin and mounting bolt for connecting to the adapter frame 1-1. The vehicle floor 1-2 is part of the lower body structure of the vehicle, and its upper part has positioning holes 15 and mounting nuts for mounting the seat adapter frame 1-1. The seat adapter frame 1-1 serves as an intermediate connector and is located between the seat assembly 1-3 and the vehicle floor 1-2. The seat assembly 1-3 is fixedly connected to the vehicle floor 1-2 via the seat adapter frame 1-1.

[0124] The front locating pin 216 of the seat adapter frame 1-1 is inserted into the locating hole 15 on the vehicle body floor 1-2. Specifically, the front locating pin 216 is a cylindrical pin whose outer diameter matches the inner diameter of the locating hole 15. The front locating pin 216 is inserted vertically into the locating hole 15 from above the vehicle body floor 1-2. There are two front locating pins 216, which are respectively located at the two front support structures of the seat adapter frame 1-1. The two front locating pins 216 are respectively inserted into the two locating holes 15 on the vehicle body floor 1-2; the two locating pins together control the XY position of the seat adapter frame 1-1.

[0125] The locating pin on the seat assembly 1-3 is inserted into the locating hole 15 in the seat adapter frame 1-1. Specifically, the lower surface of the seat assembly 1-3 is provided with a main locating pin and a secondary locating pin. The main locating pin is a cylindrical pin, the outer diameter of which matches the inner diameter of the circular hole on the crossbeam body 1 in the seat adapter frame 1-1. The secondary locating pin is a flat pin structure or a cylindrical pin, the outer diameter of which matches the inner diameter of the oblong hole in the length direction of the vehicle, while its outer diameter in the width direction is smaller than the inner diameter of the oblong hole. The main locating pin is inserted into the circular hole, controlling both the X and Y directions of the seat assembly 1-3. The secondary locating pin is inserted into the oblong hole, controlling only the X direction of the seat assembly 1-3, while the secondary locating pin can move freely within the oblong hole in the Y direction.

[0126] The seat adapter frame 1-1 is fixedly connected to the vehicle body floor 1-2 via its front mounting mechanism and rear mounting mechanism. The front locating pin 216 in the front mounting mechanism is first inserted into the locating hole 15 on the vehicle body floor 1-2 to achieve initial XY-axis positioning of the frame. Subsequently, the lower end faces of the support protrusions 215 on the front base 201 and the rear base 301 contact the upper surface of the vehicle body floor 1-2 to achieve Z-axis positioning of the frame. Four sets of mounting bolts pass through the front mounting hole 214 and the rear mounting hole respectively, and are threaded into the mounting nuts on the lower surface of the vehicle body floor 1-2 and tightened to the specified torque, completing the fixation of the frame to the vehicle body floor 1-2.

[0127] In the installed state, the support protrusion 215 in the front support structure of the seat adapter frame 1-1 abuts against the upper surface of the vehicle floor 1-2, and the support protrusion 215 in the rear support structure also abuts against the upper surface of the vehicle floor 1-2. The four support protrusions 215 together form the Z-direction support surface of the frame on the vehicle floor 1-2. The front positioning pin 216 remains inserted into the positioning hole 15 after the frame is fixed. It not only performs the positioning function during the installation process, but also provides auxiliary shear resistance in the final connected state. When the frame is subjected to horizontal (XY direction) impact load, the mating surface between the front positioning pin 216 and the positioning hole 15 can share part of the horizontal shear force, reducing the shear load on the mounting bolts. After the frame is fixed, the mounting nut on the vehicle body floor 1-2 is located below or flush with the lower surface of the vehicle body floor 1-2. The threaded end of the mounting bolt passes through the mounting hole and the floor hole from above and is threadedly connected to the nut. The head of the mounting bolt is located above the frame. After tightening, a washer can be placed between the head of the mounting bolt and the upper surface of the front base plate 211 or the rear base plate 311 to evenly distribute the bolt preload.

[0128] The seat assembly 1-3 is fixedly connected to the seat adapter frame 1-1 via locating pins and mounting bolts on its lower surface. During installation, the seat assembly 1-3 is lowered vertically from above. The main locating pin first aligns with and inserts into the round hole on the crossbeam body 1. As the seat assembly 1-3 continues to descend, the secondary locating pin aligns with and inserts into the elongated hole on another crossbeam body 1. After the locating pins are fully inserted into the locating holes 15, the lower surface of the seat assembly 1-3 contacts the upper surface of the crossbeam body 1, and the upper surface of the crossbeam base plate 11 serves as a Z-axis support surface to bear the weight of the seat assembly 1-3.

[0129] Subsequently, the four sets of seat mounting bolts are passed through the four fastening holes 14 on the crossbeam body 1 and tightened to the specified torque. In the installed state, the seat assembly 1-3 is firmly pressed onto the upper surface of the crossbeam body 1, the main locating pin is held in the round hole, and the circumferential gap between it and the inner wall of the round hole is eliminated or reduced by the fastening force to achieve a precise fit.

[0130] A method for installing a seat assembly 1-3 based on the seat adapter frame 1-1, the seat installation method comprising the following steps:

[0131] Step 1: Based on the vehicle floor 1-2, determine the seat assembly to be installed 1-3; and select the corresponding seat adapter frame 1-1;

[0132] Step 2: Connect the seat assembly to be installed 1-3 to the vehicle floor 1-2 via the adapter frame 1-1;

[0133] First, the adapter frame 1-1 is installed on the vehicle floor 1-2;

[0134] Then the seat assembly 1-3 is mounted onto the adapter frame 1-1.

[0135] Specific implementation steps:

[0136] 1. Step 1: Determine the seat assembly 1-3 to be mounted based on the vehicle body floor 1-2 and select the corresponding adapter frame 1-1;

[0137] This step is the installation preparation phase, which specifically includes the following sub-operations:

[0138] The operator first confirms the model of the current vehicle to be assembled and the seat configuration requirements corresponding to this vehicle model according to the vehicle order information or production plan. The positions of the seat mounting points on the vehicle body floor 1-2, seat height requirements, and the models and specifications of the seat assembly 1-3 may vary for different vehicle models. The operator determines the type of seat assembly 1-3 to be installed on the vehicle body floor 1-2 by visual inspection or scanning to read the vehicle model code marked on the vehicle body floor 1-2.

[0139] Subsequently, according to the determined type of the seat assembly 1-3, the operator selects the adapter frame 1-1 for the seat that is compatible with the seat assembly 1-3 and the vehicle body floor 1-2 from the storage area of the adapter frame 1-1. The selection basis includes: whether the span between the two cross beam bodies 1 on the cross beam unit of the adapter frame 1-1 matches the spacing between the left and right seat mounting points on the vehicle body floor 1-2, and whether the position of the front positioning pin 216 on the adapter frame 1-1 corresponds to the position of the positioning hole 15 on the vehicle body floor 1-2. If there are differences between high-configuration and low-configuration seats for the same vehicle model (such as different heights between power seats and manual seats), the adapter frame 1-1 of the corresponding height specification needs to be selected.

[0140] After selecting the adapter frame 1-1, the operator conducts an appearance inspection on the frame to confirm that there are no welding defects, no collision deformation, no bending or wear of each positioning pin, and no damage to the internal thread in each mounting hole. After confirming that the adapter frame 1-1 is qualified, it is transferred to the installation station of the vehicle body floor 1-2 for standby. At the same time, the corresponding seat assembly 1-3 is transferred from the seat storage area to the upper part of the installation station to prepare for the subsequent installation operation.

[0141] 2. Step 2: Connect the seat assembly 1-3 to be mounted to the vehicle body floor 1-2 through the adapter frame 1-1;

[0142] This step is the installation execution phase, which is completed sequentially in two sub-steps: first, mount the adapter frame 1-1 to the vehicle body floor 1-2, and then mount the seat assembly 1-3 to the adapter frame 1-1.

[0143] (1) Mount the adapter frame 1-1 on the vehicle body floor 1-2;

[0144] The operator uses both hands or a lifting tool to grasp the adapter frame 1-1 and moves it above the predetermined installation position on the vehicle floor 1-2. The operator visually observes the relative position of the front locating pin 216 on the front outrigger structure and the locating hole 15 on the vehicle floor 1-2, and slowly lowers the adapter frame 1-1 until the front locating pin 216 is aligned and inserted into the locating hole 15 on the vehicle floor 1-2. During insertion, the operator judges by feel whether the locating pin smoothly enters the hole; if it gets stuck, the operator slightly adjusts the frame position and tries again. After the front locating pin 216 is fully inserted into the locating hole 15, the adapter frame 1-1 is initially positioned in the XY direction on the vehicle floor 1-2.

[0145] The operator then releases or loosens the adapter frame 1-1, allowing it to descend naturally under its own weight until the lower ends of all the support protrusions 215 on the front and rear outrigger structures are in contact with the upper surface of the vehicle floor 1-2. At this point, the frame is positioned in the Z-direction of the vehicle floor 1-2, with all four corners at the same horizontal level; there should be no one side tilting up or hanging in the air. The operator visually inspects the fit between each support protrusion 215 and the floor. If there is a gap on one side, the operator checks whether the front locating pin 216 is fully inserted or whether there are any foreign objects obstructing the vehicle floor 1-2.

[0146] After confirming that the frame is correctly positioned and that the support protrusion 215 is in uniform contact with the floor, the operator begins the bolt tightening operation. The operator takes four sets of mounting bolts and inserts them into the corresponding positions of the front mounting holes 214 and the rear mounting holes. For the rear mounting holes, the operator uses a socket wrench or electric torque wrench, aligning the socket with the mounting clearance hole 55 from above the frame, inserting the socket through the clearance hole 55 into the rear mounting hole, ensuring the socket covers the head of the mounting bolt, and then tightening it. For the front mounting hole 214, the mounting bolt passes directly through the fastening hole 14 from above into the front mounting hole 214, and the operator tightens it from the side or top of the frame using a wrench. The four sets of mounting bolts are pre-tightened sequentially in a diagonal, crisscrossing order (e.g., front left → rear right → front right → rear left), and then all bolts are tightened sequentially to the specified torque value using a torque wrench. After tightening, the adapter frame 1-1 is fixedly connected to the vehicle floor 1-2.

[0147] (ii) Install the seat assembly 1-3 onto the adapter frame 1-1;

[0148] The operator uses a hoist to lift the seat assembly 1-3 directly above the adapter frame 1-1 and slowly lowers it. During the descent, the operator visually guides the main locating pin on the lower surface of the seat assembly 1-3 to align with the circular hole on the left crossbeam body 1, and simultaneously guides the secondary locating pin to align with the oblong hole on the right crossbeam body 1. As the seat assembly 1-3 continues to descend, the main locating pin first enters the circular hole, followed by the secondary locating pin entering the oblong hole. Once both locating pins are in place, the lower surface of the seat assembly 1-3 comes into contact with the upper surface of the crossbeam base plate 11, at which point the XY and Z-axis positions of the seat assembly 1-3 on the adapter frame 1-1 are simultaneously determined.

[0149] The operator visually inspects the fit between the seat assembly 1-3 and the adapter frame 1-1, confirming that the seat assembly 1-3 is level and not tilted, and that all locating pins are engaged in their corresponding locating holes 15. Then, four sets of seat mounting bolts are taken and inserted into the four fastening holes 14 on the crossbeam body 1. After pre-tightening each bolt, a torque wrench is used to tighten them to the specified torque value. The tightening sequence is also diagonally alternating to ensure even force distribution on the seat assembly 1-3 and to prevent locating pin misalignment or crossbeam body 1 deformation due to excessive pre-tightening on one side.

[0150] After seat assembly 1-3 is fully tightened, the operator conducts a final inspection of the installation quality, including: confirming that all mounting bolts are tightened to the torque specifications, confirming that seat assembly 1-3 is not loose or wobbly on adapter frame 1-1, and confirming that the gap between seat assembly 1-3 and the vehicle interior parts meets design requirements. Once the inspection is passed, the installation of seat assembly 1-3 is complete, and the vehicle is moved to the next workstation for subsequent assembly.

[0151] Example 1:

[0152] This embodiment provides a seat adapter frame 1-1, mainly comprising a crossbeam unit and a leg unit. The crossbeam unit includes two crossbeam bodies 1, spaced apart along the vehicle width direction, and fixedly connected by a connecting tube beam 4. The leg unit includes leg structures, each comprising a front leg structure and a rear leg structure. Each crossbeam body 1 is connected to one leg structure. In each leg structure, the front leg structure is located at the lower front end of the corresponding crossbeam body 1, and the rear leg structure is located at the lower rear end of the crossbeam body 1. Each crossbeam body 1 is fixedly connected to the vehicle floor 1-2 via the corresponding front and rear leg structures. The crossbeam bodies 1 are used to mount the seat assembly 1-3, allowing the seat assembly 1-3 to be indirectly connected to the vehicle floor 1-2 via the adapter frame 1-1.

[0153] The crossbeam body 1 is a one-piece structure formed by stamping high-strength steel plate, with a U-shaped vertical cross-section and an inverted U-shaped internal cross-section. Specifically, the crossbeam body 1 includes a crossbeam base plate 11 and crossbeam side plates 12 respectively disposed on opposite sides of the crossbeam base plate 11 in the width direction. The crossbeam base plate 11 is horizontal plate-shaped, and the two crossbeam side plates 12 bend downward from the edge of the crossbeam base plate 11, thereby forming a U-shaped channel structure with the opening facing downward. This U-shaped cross-section design enables the crossbeam body 1 to have excellent bending and torsional stiffness when bearing the vertical load and longitudinal impact load transmitted by the seat assembly 1-3, while significantly reducing weight compared to solid or closed cross-section structures under the same load-bearing capacity.

[0154] The connecting tube beam 4 is a square tube structure, with its two ends connected to the two crossbeam bodies 1 respectively. A through slot 13 is provided on the crossbeam body 1 at the corresponding installation position of the connecting tube beam 4. The through slot 13 passes through the crossbeam side plate 12 of the crossbeam body 1, and the two ends of the connecting tube beam 4 pass through the corresponding through slot 13 and are fixedly connected to the crossbeam body 1 by welding. Thus, the horizontal projection of the crossbeam unit is H-shaped, with the two crossbeam bodies 1 serving as the two longitudinal arms of the H-shape, and the connecting tube beam 4 serving as the lateral connecting arm of the H-shape. This H-shaped layout effectively constrains the relative displacement between the two crossbeam bodies 1, ensuring the integrity and structural symmetry of the seat adapter frame 1-1. Simultaneously, the connecting tube beam 4's proximity to the front support structure provides additional lateral support to the front load-bearing area, effectively transferring longitudinal loads during frontal collisions or emergency braking. Furthermore, the forward placement of the connecting tube beam 4 (close to the front of the vehicle body) increases legroom for rear passengers.

[0155] In this invention, the front support structure includes a front base 201 and a front mounting mechanism. The front base 201 is welded to the crossbeam body 1 to which it is connected. The front base 201 includes a front base base plate 211 and front base side plates 212 respectively disposed on opposite sides of the front base base plate 211. The horizontal projection of the front base base plate 211 partially coincides with the horizontal projection of the crossbeam body 1, that is, the front base base plate 211 extends forward from the front end of the crossbeam body 1 and slightly exceeds it. The front base side plates 212 bend upward from the edge of the front base base plate 211, so that the vertical cross section of the front base 201 is U-shaped with the opening facing upward.

[0156] The rear support structure includes a rear base 301 and a rear mounting mechanism. The rear base 301 includes a rear base base plate 311 and rear base side plates 312 respectively disposed on opposite sides of the rear base base plate 311. The horizontal projection of the rear base base plate 311 completely coincides with the horizontal projection of the crossbeam body 1. The rear base side plates 312 bend upward from the edge of the rear base base plate 311, so that the vertical cross section of the rear base 301 is U-shaped with the opening facing upward.

[0157] The front mounting mechanism includes a front mounting hole 214 and a front positioning pin 216. The front mounting hole 214 is formed on the front base plate 211 and is used for mounting bolts to pass through to fix the front support structure to the vehicle floor 1-2. The front positioning pin 216 is fixedly set on the lower surface of the front base plate 211, and its axis extends vertically to be inserted into the corresponding positioning hole 15 on the vehicle floor 1-2, thereby achieving precise positioning between the seat adapter frame 1-1 and the vehicle floor 1-2. The rear mounting mechanism includes a rear mounting hole, which is formed on the rear base plate 311 and is used for mounting bolts to pass through to fix the rear support structure to the vehicle floor 1-2. Support protrusions 215 are respectively provided at the edges of the front mounting hole 214 and the rear mounting hole. The support protrusions 215 are annular boss structures surrounding the mounting holes, and the lower end surface of the support protrusions 215 is a flat support surface. When the front and rear support structures are positioned on the vehicle floor 1-2, the lower end face of the support protrusion 215 directly contacts the upper surface of the vehicle floor 1-2, while other areas of the front base plate 211 and the rear base plate 311 maintain a gap with the vehicle floor 1-2. This design of the support protrusion 215 ensures a clear Z-axis positioning reference and precise control of the contact area, effectively reducing assembly stress caused by local unevenness of the vehicle floor 1-2 and reducing the installation tilt of the adapter frame 1-1.

[0158] In this invention, a front clearance arc-shaped groove 202 is provided on the front base side plate 212, and a rear clearance arc-shaped groove 302 is provided on the rear base side plate 312. The front clearance arc-shaped groove 202 is arranged at the end of the front base side plate 212 away from the rear base 301, and is located at the edge of the front base side plate 212 near the crossbeam body 1. The arc-shaped groove is recessed downward from the upper edge of the front base side plate 212 to form an arc-shaped notch. The rear clearance arc-shaped groove 302 is arranged at the end of the rear base side plate 312 away from the front base 201, and is located at the edge of the rear base side plate 312 away from the crossbeam body 1. The arc-shaped groove is recessed upward from the lower edge of the rear base side plate 312 to form an arc-shaped notch. The front clearance arc groove 202 and the rear clearance arc groove 302 provide operating space for the welding torch to extend during the welding process, and also provide clearance channels for the screwing tools for installing bolts. At the same time, the arc-shaped transition of the groove effectively avoids stress concentration at sharp corners and ensures the fatigue life of the structure.

[0159] The crossbeam body 1 is provided with a connection structure for connecting to the seat assembly 1-3. The connection structure includes a fastening mechanism and a positioning mechanism. The fastening mechanism includes fastening holes 14 provided at the ends of the crossbeam body 1. In this embodiment, each crossbeam body 1 has one fastening hole 14 at both its front and rear ends.

[0160] The positioning mechanism includes positioning holes 15 on the crossbeam body 1. The positioning holes 15 are either circular or oblong through holes penetrating the crossbeam base plate 11. Of the two crossbeam bodies 1, one has a circular positioning hole 15, and the other has an oblong positioning hole 15, with the length of the oblong hole extending along the vehicle width direction. The circular hole on the first crossbeam body 1 serves as the main positioning hole 15 for the seat assembly 1-3, controlling its X and Y directions. The oblong hole on the second crossbeam body 1 serves as the secondary positioning hole 15 for the seat assembly 1-3, controlling only its X direction while releasing its Y-direction freedom. Thus, when the positioning pins of the seat assembly 1-3 are inserted into the circular and oblong holes, they achieve self-positioning assembly with a "one main, one fixed" configuration, ensuring positioning accuracy and avoiding over-positioning interference caused by manufacturing errors between the distance between the two positioning holes 15 and the distance between the two positioning pins. In addition, the crossbeam base plate 11 and the crossbeam side plate 12 of the crossbeam body 1 are provided with a number of openings, grooves and weight reduction holes. These grooves and openings effectively reduce the weight of the crossbeam, while increasing the local stiffness of the crossbeam body 1 through the bending structure of the grooves.

[0161] The front support structure also includes a front reinforcing plate 6 and a bracket baffle 213. The bracket baffle 213 is a flat plate structure, with its two ends fixedly connected to the front base side plates 212 on both sides. The plate surface of the bracket baffle 213 is arranged vertically to constrain the relative deformation between the two front base side plates 212. The front reinforcing plate 6 is attached to the crossbeam body 1. Specifically, the front reinforcing plate 6 is located in the area of ​​the crossbeam body 1 near the front support structure, and is attached to part of the surface of the crossbeam base plate 11 and the crossbeam side plate 12, and is fixedly connected to the crossbeam body 1 by welding. The front reinforcing plate 6 effectively enhances the local strength of the front end of the crossbeam body 1, ensuring that the load can be effectively transferred to the front support structure when the seat assembly 1-3 is subjected to forward impact load.

[0162] The rear support structure includes a rear reinforcing plate 5. The rear reinforcing plate 5 includes a rear reinforcing base plate, which is an integrally stamped structure comprising a reinforcing transverse plate 51, a reinforcing longitudinal plate 53, and a reinforcing middle plate 52. The reinforcing transverse plate 51 is a horizontally elongated strip extending along the vehicle width direction; the reinforcing longitudinal plate 53 extends along the vehicle height direction and is arranged longitudinally; the reinforcing middle plate 52 is an inclined plate, intersecting with both the reinforcing longitudinal plate 53 and the reinforcing transverse plate 51, and the reinforcing transverse plate 51 is connected to the reinforcing longitudinal plate 53 via the reinforcing middle plate 52. The rear reinforcing plate 5 is fixedly connected to the lower surface of the crossbeam body 1 via the reinforcing transverse plate 51. Specifically, the upper surface of the reinforcing transverse plate 51 is attached to the lower surface of the crossbeam base plate 11 and fixed by welding. The two side edges of the rear reinforcing base plate are respectively connected to the corresponding rear base side plate 312, that is, the side edges of the reinforcing longitudinal plate 53 and the side edges of the reinforcing middle plate 52 are fixed to the inner wall of the rear base side plate 312 by welding. A rear reinforcing flange 54 is provided at the edge of the rear reinforcing base plate. The rear reinforcing flange 54 bends upward from part of the edge of the rear reinforcing base plate. The rear reinforcing flange 54 in the rear reinforcing plate 5 is connected to both the crossbeam side plate 12 of the crossbeam body 1 and the rear base side plate 312. This rear reinforcing plate 5 structure forms a multi-directional force transmission grid between the crossbeam body 1 and the rear base 301.

[0163] Both the rear reinforcing plate 5 and the crossbeam body 1 are provided with mounting clearance holes 55. Specifically, the mounting clearance holes 55 are opened in the reinforcing middle plate 52 area of ​​the rear reinforcing plate 5 and the corresponding position of the crossbeam base plate 11 of the crossbeam body 1, and the mounting clearance holes 55 of the two are interconnected in the vertical direction. The horizontal projection of the mounting clearance hole 55 completely covers the horizontal projection of the rear mounting hole on the rear base 301, that is, directly above the rear mounting hole, a vertically penetrating channel is formed by the crossbeam base plate 11 and the reinforcing longitudinal plate 53. The diameter of the mounting clearance hole 55 is larger than the outer diameter of the head of the rear mounting bolt and the outer diameter of the tightening tool, so that after the crossbeam body 1, the rear reinforcing plate 5, the front base 201 and the rear base 301 are all welded to form an integral frame, the operator can still insert the installation tool into the rear mounting hole from above through the mounting clearance hole 55 to complete the tightening operation of the rear mounting bolt to the vehicle floor 1-2. This design effectively solves the technical problem of being unable to assemble inside the enclosed cavity caused by the crossbeam body 1 covering the rear mounting holes.

[0164] This embodiment provides a vehicle including a seat assembly 1-3, a vehicle floor 1-2, and a seat adapter frame 1-1 as described above. The upper surface of the vehicle floor 1-2 is provided with positioning holes 15 and mounting nuts that are adapted to the seat adapter frame 1-1. The positioning holes 15 include main positioning holes 15 and secondary positioning holes 15, respectively corresponding to the number and position of the front positioning pins 216 of the seat adapter frame 1-1. Four sets of mounting nuts are pre-fixed on the lower surface of the vehicle floor 1-2 or inside the vehicle floor 1-2, corresponding to the positions of the front mounting holes 214 and the rear mounting holes in the seat adapter frame 1-1.

[0165] The seat assembly 1-3 is connected to the vehicle floor 1-2 via a seat adapter frame 1-1. Specifically, the front locating pin 216 of the seat adapter frame 1-1 is inserted into the locating hole 15 on the vehicle floor 1-2, achieving XY-axis positioning of the seat adapter frame 1-1 on the vehicle floor 1-2. The lower end face of the support protrusion 215 in the seat adapter frame 1-1 abuts against the upper surface of the vehicle floor 1-2, achieving Z-axis positioning. Four sets of mounting bolts pass through the front mounting hole 214 and the rear mounting hole, respectively, and are threaded and tightened to the corresponding mounting nuts on the vehicle floor 1-2, thus fixing the seat adapter frame 1-1 to the vehicle floor 1-2. The lower surface of the seat assembly 1-3 is provided with locating pins and mounting bolts that are compatible with the seat adapter frame 1-1. The locating pins of seat assembly 1-3 include a main locating pin and a secondary locating pin. The diameter of the main locating pin matches the diameter of the circular hole on the crossbeam body 1. The secondary locating pin is a flat pin structure, with its dimension along the vehicle width direction smaller than its dimension along the vehicle length direction, so that it can be inserted into the oblong hole and has a certain amount of movement allowance in the length direction (vehicle width direction) of the oblong hole. The main locating pin on seat assembly 1-3 is inserted into the circular hole on the crossbeam body 1, controlling the X and Y directions of seat assembly 1-3; the secondary locating pin on seat assembly 1-3 is inserted into the oblong hole on the crossbeam body 1, controlling only the X direction of seat assembly 1-3 and releasing the Y direction degree of freedom. The mounting bolts on seat assembly 1-3 pass through the fastening holes 14 on the crossbeam body 1 and are threadedly connected to and tightened with the mounting nuts welded to the inner wall of the fastening holes 14, thus fixing seat assembly 1-3 to seat adapter frame 1-1.

[0166] A method for installing a seat assembly 1-3 based on the aforementioned seat adapter frame 1-1, the method comprising the following steps:

[0167] Step 1: Based on the distribution of the positioning holes 15 and mounting nuts on the vehicle floor 1-2, determine the model of the seat assembly 1-3 to be installed, and select a seat adapter frame 1-1 that is compatible with both the seat assembly 1-3 and the vehicle floor 1-2. Specifically, based on the front-to-back spacing and left-to-right width of the front seat mounting points on the vehicle floor 1-2, select an adapter frame 1-1 whose span of the crossbeam body 1 and the position of the support structure match.

[0168] Step 2: Connect the seat assembly 1-3 to the vehicle floor 1-2 via the adapter frame 1-1. This step further includes two sub-steps:

[0169] First, install the adapter frame 1-1 onto the vehicle floor 1-2. The operator holds the seat adapter frame 1-1 and moves it to the predetermined installation position on the vehicle floor 1-2, aligning the front locating pin 216 on the front outrigger structure with the locating hole 15 on the vehicle floor 1-2. Then, insert the front locating pin 216 into the locating hole 15 to complete the initial XY-axis positioning of the adapter frame 1-1 on the vehicle floor 1-2. Next, ensure that the lower end face of each support protrusion 215 is in contact with the upper surface of the vehicle floor 1-2, ensuring the adapter frame 1-1 is in a horizontal and stable state. Then, pass the four sets of mounting bolts through the front mounting hole 214 and the rear mounting hole from above, and tighten them into the mounting nuts on the vehicle floor 1-2. After tightening all bolts to the specified torque, the fixed connection between the adapter frame 1-1 and the vehicle floor 1-2 is completed.

[0170] Next, the seat assembly 1-3 is installed on the adapter frame 1-1. The operator hoists the seat assembly 1-3 directly above the adapter frame 1-1 and slowly lowers it, aligning the main locating pin on the lower surface of the seat assembly 1-3 with and inserting it into the round hole on the crossbeam body 1, while simultaneously aligning the secondary locating pin with and inserting it into the oblong hole on the crossbeam body 1. The seat assembly 1-3 is lowered further until its lower surface contacts the upper surface of the crossbeam body 1. At this point, the upper surface of the crossbeam base plate 11 around the round and oblong holes serves as the Z-axis support surface, bearing the weight of the seat assembly 1-3. Subsequently, the four sets of seat mounting bolts are passed through the four fastening holes 14 on the crossbeam body 1 and tightened to the specified torque, completing the fixation of the seat assembly 1-3 on the adapter frame 1-1.

[0171] The above-described step-by-step installation method provides clear positioning benchmarks, open operating space, and clear process logic for each installation step, facilitating assembly line operations and effectively improving production efficiency.

[0172] The adapter frame 1-1 disclosed in this invention is constructed by welding multiple supports into an integral frame structure. Each support incorporates groove, weight-reduction hole, and clearance hole designs, ultimately forming a single, integrated frame structure through welding. This structure not only meets strength and weight-reduction requirements but also facilitates easy access for on-site operators through the connecting pipe beam 4 design. This seat adapter frame 1-1 self-positions itself onto the vehicle body floor 1-2 holes and seat assembly 1-3, shortening the dimensional links, reducing the precision requirements for the vehicle body floor 1-2 holes and seat mounting holes, simplifying assembly, and significantly improving production efficiency.

[0173] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A connecting frame for a seat, characterized in that, Includes beam units and support units; The beam unit includes at least two beam bodies; the support unit includes a support structure; the support structure includes a front support structure and a rear support structure; Each of the aforementioned crossbeam bodies can be connected to the vehicle floor via a support structure; The crossbeam body can be used to connect the seat assembly to the vehicle floor.

2. The adapter frame for a seat according to claim 1, characterized in that, The front support structure includes a front base and a front mounting mechanism; The rear support structure includes a rear base and a rear mounting mechanism; The crossbeam body is provided with a connecting structure; The front base can be connected to the vehicle floor via a front mounting mechanism; the rear support leg can be connected to the vehicle floor via a rear mounting mechanism; the crossbeam body can be connected to the seat assembly via a connecting structure.

3. A seat adapter frame according to claim 2, characterized in that, The connection structure includes a fastening mechanism and a positioning mechanism; The fastening mechanism includes fastening holes provided at the ends of the crossbeam body; The positioning mechanism includes a positioning hole provided on the crossbeam body; the positioning hole is a round hole or an oblong hole. The front mounting mechanism includes a front mounting hole and a front positioning pin; the rear mounting mechanism includes a rear mounting hole; support protrusions are provided at the edges of the front mounting hole and the rear mounting hole; both the front support leg and the rear support leg can be arranged on the vehicle floor through the support protrusions.

4. A seat adapter frame according to any one of claims 1-3, characterized in that, The beam body includes a beam base plate; the beam base plate is provided with a beam side plate on each of its opposite sides. The front base includes a front base substrate; the front base substrate is provided with front base side plates on opposite sides; The rear base includes a rear base base plate; the rear base base plate is provided with rear base side plates on opposite sides; The vertical cross-section of the beam body, the front base and / or the rear base is U-shaped.

5. A seat adapter frame according to claim 4, characterized in that, The crossbeam unit also includes a connecting pipe beam; the two ends of the connecting pipe beam are respectively connected to the two crossbeam bodies; the horizontal projection of the crossbeam unit is H-shaped; the crossbeam body is provided with a through groove; the connecting pipe beam passes through the through groove.

6. A seat adapter frame according to claim 4, characterized in that, The front base plate and the horizontal projection of the crossbeam body are partially overlapped; the rear base plate and the horizontal projection of the crossbeam body are overlapped; a front clearance arc groove is provided on the front base side plate; a rear clearance arc groove is provided on the rear base side plate; the front clearance arc groove is arranged at the end of the front base side plate away from the rear base and is located on the side of the front base side plate closer to the crossbeam body; the rear clearance arc groove is arranged at the end of the rear base side plate away from the front base and is located on the side of the rear base side plate away from the crossbeam body.

7. A seat adapter frame according to claim 6, characterized in that, The front support structure also includes a front reinforcing plate and a bracket baffle; each end of the bracket baffle is connected to a front base side plate; the front reinforcing plate is fitted onto the crossbeam body connected to it; The rear support structure includes a rear reinforcing plate, which includes a rear reinforcing base plate. The rear reinforcing base plate includes a reinforcing horizontal plate, a reinforcing vertical plate, and a reinforcing middle plate. The reinforcing middle plate is arranged intersecting with both the reinforcing vertical plate and the reinforcing horizontal plate. The reinforcing horizontal plate is connected to the reinforcing vertical plate through the reinforcing middle plate. The rear reinforcing plate is connected to the crossbeam body through the reinforcing horizontal plate. Each side of the rear reinforcing base plate is connected to a rear base side plate.

8. A seat adapter frame according to claim 7, characterized in that, Both the rear reinforcing plate and the crossbeam body are provided with mounting clearance holes; the horizontal projection of the mounting clearance hole covers the horizontal projection of the rear mounting hole on the rear base connected to it; the rear reinforcing plate has a rear reinforcing flange at its edge; the rear reinforcing flange in the rear reinforcing plate is connected to both the crossbeam side plate and the rear base side plate of the crossbeam body; the connecting pipe beam in the crossbeam unit is arranged on the crossbeam body near the front support structure; of the two crossbeam bodies, the positioning hole on one crossbeam body is a round hole, and the positioning hole on the other crossbeam body is an oblong hole.

9. A vehicle, characterized in that, Includes a seat assembly, a vehicle floor, and a seat adapter frame as described in any one of claims 1-8; the seat assembly is connected to the vehicle floor via the seat adapter frame; the vehicle floor is provided with positioning holes; The front locating pin in the seat adapter frame is inserted into the locating hole in the vehicle floor; The locating pin on the seat assembly is inserted into the locating hole in the seat adapter frame.

10. A method for installing a seat assembly based on a seat adapter frame as described in any one of claims 1-8, characterized in that, The seat installation method includes the following steps: Step 1: Based on the vehicle floor, determine the seat assembly to be installed; and select the corresponding seat adapter frame; Step 2: Connect the seat assembly to be installed to the vehicle floor using the adapter frame; First, the adapter frame is installed on the vehicle floor; Then install the seat assembly onto the adapter frame.

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