A floor welding assembly based on a front pre-driver improved rear drive vehicle

Abstract

The application discloses a floor welding assembly based on a front-engine front-drive improved rear-drive vehicle type, which comprises a cabin assembly, a floor framework assembly and a floor skin, the end portions of the cabin assembly and the floor skin are connected through welding, and the floor skin and the cabin assembly are fixedly arranged above the floor framework assembly; the floor framework assembly is arranged with a first avoiding structure for a transmission shaft to pass through, a second avoiding structure for rear wheel double tires to be arranged and a third avoiding structure for a rear axle wheel hub to be arranged, and the cabin assembly is arranged with a fourth avoiding structure for an engine cooling package to be arranged. Through the arrangement of the first avoiding structure for the transmission shaft to pass through, the second avoiding structure for the rear wheel double tires to be arranged and the third avoiding structure for the rear axle wheel hub to be arranged on the floor framework assembly, and the arrangement of the fourth avoiding structure for the engine cooling package to be arranged on the cabin assembly, the white vehicle body based on the front-engine front-drive vehicle type is improved into the rear-drive vehicle type.

Description

Technical Field

[0001] This invention relates to the field of vehicle body system technology, and more specifically to a floor welding assembly for a rear-wheel drive vehicle based on a front-engine, front-wheel drive modified version. Background Technology

[0002] Currently, existing front-wheel drive body-in-whites can only accommodate transversely mounted engines, resulting in a significant gap in handling and load-bearing capacity between front-wheel drive and rear-wheel drive models. To meet the diverse needs of consumers, it is now necessary to develop a front-engine, rear-wheel drive body-in-white.

[0003] To meet the requirements of the front-engine, rear-wheel-drive vehicle chassis layout, some models use a newly developed body-in-white. This requires corresponding modifications to the front grille, fenders, front bumper, dashboard, and doors, resulting in significant investment and a long development cycle.

[0004] Therefore, it is urgent to propose a new solution to the above problems. Summary of the Invention

[0005] This invention provides a floor welding assembly for a front-engine, front-wheel-drive vehicle based on an improved rear-wheel-drive model. It solves the problem that when applying an existing front-engine, front-wheel-drive body-in-white to a front-engine, rear-wheel-drive vehicle, the front grille, fenders, front bumper, dashboard, and doors all need to be modified accordingly, resulting in large investments and long development cycles.

[0006] The present invention provides a floor welding assembly for a rear-wheel drive vehicle based on a front-engine, front-wheel drive improvement. The floor welding assembly includes an engine compartment assembly, a floor frame assembly, and a floor skin. The ends of the engine compartment assembly and the floor skin are connected by welding. The floor skin and the engine compartment assembly are fixedly disposed above the floor frame assembly.

[0007] The floor frame assembly is provided with a first clearance structure for the drive shaft to pass through, a second clearance structure for the rear dual tires to be arranged, and a third clearance structure for the rear axle wheel well to be arranged. The engine compartment assembly is provided with a fourth clearance structure for the engine cooling pack to be arranged.

[0008] Further, the floor frame assembly includes a front floor frame and a rear floor frame; the front floor frame includes a first crossbeam, a second crossbeam, and a third crossbeam arranged parallel to each other from the front of the vehicle towards the parking space, and a left front longitudinal beam assembly and a right front longitudinal beam assembly fixedly connected to its left and right sides respectively; the rear floor frame includes a fourth crossbeam, multiple fifth crossbeams, a sixth crossbeam, multiple seventh crossbeams of the same size, and a rear crossbeam, and a left rear longitudinal beam assembly and a right rear longitudinal beam assembly fixedly connected to its left and right sides respectively, a left front wheel arch assembly, a right front wheel arch assembly, a rear wheel arch, a first driveshaft mounting small longitudinal beam and a second driveshaft mounting small longitudinal beam, and the first driveshaft mounting small longitudinal beam... A small longitudinal beam is fixedly installed between the middle of the fourth crossbeam and the middle of the fifth crossbeam. One end of the second drive shaft mounting small longitudinal beam is fixed to the end of the first drive shaft mounting small longitudinal beam, and the other end is fixedly connected to the middle of the fifth crossbeam. A gearbox is provided below the first, second, and third crossbeams. A fifth clearance structure for arranging the gearbox is provided in the middle of the first, second, and third crossbeams. The fifth clearance structure includes an arc-shaped protrusion located in the middle of the first, second, and third crossbeams. The size of the arc-shaped protrusion is adapted to the size of the gearbox housing. The gearbox is located above the first and second crossbeams.

[0009] Furthermore, the number of the fifth crossbeam is four, the number of the seventh crossbeam is three, the floor panel includes a front floor panel, a front floor rear panel, a middle floor panel, and a rear floor panel that are fixedly connected end to end, the front end of the front floor panel is consistent with that of the front-engine, front-wheel-drive vehicle, the front floor panel is overlapped and welded to the front floor rear panel, the rear axle hub is located between the sixth and seventh crossbeams, and the first clearance structure includes the space located below the front floor rear panel, the middle floor panel, the rear floor panel, and the rear floor frame.

[0010] Furthermore, the third avoidance structure includes an avoidance boss located in the middle of the sixth crossbeam. The minimum distance between the edge of the avoidance boss and the edge of the rear axle wheel well is greater than 15mm. A reinforcing rib arranged in the transverse direction is provided on the side of the avoidance boss away from the rear axle wheel well.

[0011] Furthermore, the engine compartment assembly includes a front windshield crossbeam, an instrument crossbeam, and a front bulkhead panel that are connected and fixed from top to bottom. The fourth clearance structure includes a small bulge in the middle of the front bulkhead panel. The projected length of the small bulge along the length of the vehicle is 140-160mm. The minimum gap between the engine housing and the front bulkhead panel is greater than 25mm, and the minimum gap between the front bulkhead panel and the rear heater is greater than 15mm.

[0012] Furthermore, the left rear longitudinal beam assembly and the right rear longitudinal beam assembly are arranged in parallel, and the distance between the left rear longitudinal beam assembly and the right rear longitudinal beam assembly is 550-570mm. The second clearance structure includes clearance space disposed between the rear wheel arch and the rear longitudinal beam assembly.

[0013] Furthermore, the rear floor panel end and the rear tail beam outer plate are connected by an L-shaped sill connecting plate, the rear tail beam outer plate and the rear tail beam inner plate together form a rear door opening, the end of the left rear longitudinal beam assembly and the rear tail beam inner plate are connected by a connecting torsion leg, the end of the left rear longitudinal beam assembly and the sill connecting plate are connected by an L-shaped end connecting plate, and the sill connecting plate and the end connecting plate are spot welded together.

[0014] Furthermore, the distance d between the top of the rear floor skin and the top of the rear tail beam outer plate is 90-110 mm.

[0015] Furthermore, the front floor skin is designed with a central bulge structure to avoid the gearbox, and the edge of the central bulge structure is provided with a gear shift wire sleeve mounting hole for mounting the gear shift wire sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The body-in-white of this invention is based on a front-engine, front-wheel-drive vehicle modified to a rear-wheel-drive vehicle. The roof welding assembly and the left and right side welding assemblies borrow the structure of the front-wheel-drive vehicle. Only the floor welding assembly needs to be designed and developed accordingly, which improves adaptability and reduces the development cost of the new production line.

[0018] 2. The present invention achieves the conversion of a front-wheel drive vehicle body into a rear-wheel drive vehicle by arranging a first clearance structure for the drive shaft to pass through, a second clearance structure for the rear dual tires to be arranged on the floor frame assembly, a third clearance structure for the rear axle wheel hub to be arranged, and a fourth clearance structure for the engine cooling pack to be arranged on the engine compartment assembly.

[0019] 3. By adding a threshold connecting plate and an end connecting plate, the present invention adopts a stepped design, which can ensure that the mounting surface of the rear door opening remains unchanged, while also meeting the arrangement requirements of the rear drive shaft and rear axle hub. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the body-in-white of the present invention;

[0021] Figure 2 This is a schematic diagram of the floor welding assembly of the body-in-white of the present invention;

[0022] Figure 3 for Figure 2 Sectional view at point AA;

[0023] Figure 4 For front-engine, front-wheel-drive vehicles Figure 3 A sectional view of the location;

[0024] Figure 5 for Figure 2 Sectional view at point BB;

[0025] Figure 6 For front-engine, front-wheel-drive vehicles Figure 5 A sectional view of the location;

[0026] Figure 7 This is a side view of the overall structure of the body-in-white of the present invention;

[0027] Figure 8 This is a top view of the floor frame assembly of the body-in-white of the present invention;

[0028] Figure 9 This is a top view of the floor skin of the body-in-white of the present invention;

[0029] Figure 10 This is a three-dimensional schematic diagram of the engine compartment of the body-in-white of the present invention;

[0030] Figure 11 This is a front view of the sixth crossbeam of the present invention;

[0031] Figure 12 This is a top view of the sixth crossbeam of the present invention;

[0032] Figure 13 This is a schematic diagram of the structure of the front floor skin of the present invention;

[0033] Reference numerals: A. Floor welding assembly; B. Left side panel welding assembly; C. Right side panel welding assembly; D. Top cover welding assembly; 1. Cabin assembly; 2. Floor frame assembly; 21. First crossbeam; 22. Second crossbeam; 23. Third crossbeam; 24. Fourth crossbeam; 25. Fifth crossbeam; 26. Sixth crossbeam; 27. Seventh crossbeam; 28. Rear end crossbeam; 291. Front door sill step; 292. Sliding door sill step; 201. Left front longitudinal beam assembly; 202. Right front longitudinal beam assembly; 203. Left rear longitudinal beam assembly; 204. Right rear longitudinal beam assembly; 205. Left front wheel arch assembly; 206. Right front wheel arch assembly. Assembly; 207, Rear wheel arch; 208, First driveshaft mounting small longitudinal beam; 209, Second driveshaft mounting small longitudinal beam; 3, Floor cover; 31, Front floor cover; 32, Front floor rear compartment cover; 33, Middle floor cover; 34, Rear floor cover; 41, Driveshaft; 42, Rear dual tires; 43, Rear axle wheel well; 44, Gearbox; 51, Arc-shaped protrusion; 52, Clearance protrusion; 53, Middle bulge structure; 531, Shift bar wire sleeve mounting hole; 61, Rear tail beam outer plate; 62, Sill plate connecting plate; 63, Rear tail beam inner plate; 64, Connecting torsion leg; 65, End connecting plate; 66, Rear door opening. Detailed Implementation

[0034] To further understand the invention's content, features, and effects, the following embodiments are provided, along with accompanying drawings. Figures 1-13 The details are as follows.

[0035] like Figure 1 , 3 As shown in Figure 4, the body-in-white of the vehicle includes a floor welding assembly A, a left side panel welding assembly B and a right side panel welding assembly C located on either side of the floor welding assembly A, and a roof welding assembly D located above the two side panel welding assemblies. The left side panel welding assembly B and the right side panel welding assembly C are the same as those of the front-wheel drive model. The original sill connecting plate 62 on the right side panel assembly C is extended upward by 100mm along the height direction and is welded together with the raised rear floor frame and the roof assembly D to form the body-in-white body assembly. The rear floor frame is raised by 100mm, while the left side panel welding assembly B and the right side panel welding assembly C remain unchanged. However, the raised rear floor frame needs to be welded to the side panel welding assemblies on both sides. Therefore, a sheet metal part with a height of 120mm is added to the side panel connecting plates of the two side panel welding assemblies.

[0036] In this embodiment, as Figure 2As shown, the aforementioned floor welding assembly A includes a nacelle assembly 1, a floor frame assembly 2, and a floor skin 3. The ends of the nacelle assembly 1 and the floor skin 3 are connected by welding. The floor skin 3 and the nacelle assembly 1 are fixedly mounted above the floor frame assembly 2. The floor frame assembly 2 is provided with a first clearance structure for the drive shaft 41 to pass through, a second clearance structure for the rear dual tires 42 to be arranged, and a third clearance structure for the rear axle wheel hub 43 to be arranged. The nacelle assembly 1 is provided with a fourth clearance structure for the engine cooling pack to be arranged. This invention relates to a body-in-white that is modified from a front-engine, front-wheel-drive vehicle to a rear-wheel-drive vehicle. The roof welding assembly and the left and right side panel welding assemblies borrow the structure of a front-wheel-drive vehicle. Only the floor welding assembly needs to be designed and developed accordingly, which improves adaptability and reduces the development cost of new production lines. In addition, by arranging a first clearance structure for the drive shaft to pass through, a second clearance structure for the rear dual tires to be arranged, and a third clearance structure for the rear axle wheel hub to be arranged on the floor frame assembly, and a fourth clearance structure for the engine cooling pack to be arranged on the engine compartment assembly, the body-in-white of a front-engine, front-wheel-drive vehicle can be modified to a rear-wheel-drive vehicle.

[0037] In this embodiment, as Figure 8 As shown, the floor frame assembly 2 includes a front floor frame and a rear floor frame; the front floor frame includes a first crossbeam 21, a second crossbeam 22, and a third crossbeam 23 arranged in parallel from the front of the vehicle towards the parking space, and a left front longitudinal beam assembly 201 and a right front longitudinal beam assembly 202 fixedly connected to its left and right sides respectively; the rear floor frame includes a fourth crossbeam 24, multiple fifth crossbeams 25 and a sixth crossbeam 26 of the same size, multiple seventh crossbeams 27 of the same size, and a rear crossbeam 28, and is fixedly connected to its left and right sides respectively. The left and right rear longitudinal beam assemblies 203 and 204 are connected, along with the left and right front wheel arch assemblies 205 and 206, the rear wheel arch assemblies 207, the first driveshaft mounting small longitudinal beam 208, and the second driveshaft mounting small longitudinal beam 209. The first driveshaft mounting small longitudinal beam 208 is fixedly positioned between the middle of the fourth crossbeam 24 and the middle of the fifth crossbeam 25. One end of the second driveshaft mounting small longitudinal beam 209 is fixed to the end of the first driveshaft mounting small longitudinal beam 208, and the other end is fixedly connected to the middle of the fifth crossbeam 25. The front half (before the A-pillar) of the left and right front longitudinal beam assemblies 201 and 202 remains unchanged to ensure that the front end, subframe, and dashboard can utilize the front-wheel drive model. Then, the rear part of the A-pillar is partially optimized and horizontally overlapped with the rear longitudinal beam. The front door sill steps 291 and sliding door sill steps 292 on both sides have also been adjusted accordingly.

[0038] In this embodiment, as Figures 5-6As shown, a gearbox 44 is disposed below the first crossbeam 21, the second crossbeam 22, and the third crossbeam 23. A fifth clearance structure for arranging the gearbox 44 is disposed in the middle of the first crossbeam 21, the second crossbeam 22, and the third crossbeam 23. The fifth clearance structure includes an arc-shaped protrusion 51 located in the middle of the first crossbeam 21, the second crossbeam 22, and the third crossbeam 23. The size of the arc-shaped protrusion 51 is adapted to the size of the gearbox 44 housing. In this embodiment, the maximum clearance space of the arc-shaped protrusion 51 is 503mm × 136mm. The gearbox 44 is disposed above the first crossbeam 21 and the second crossbeam 22. In front-wheel drive vehicles, the arc-shaped protrusion 51 is not required, and the height of the first crossbeam 21 and the second crossbeam 22 is reduced from 84mm to 50mm.

[0039] In this embodiment, as Figure 8 As shown, there are four fifth crossbeams 25 and three seventh crossbeams 27, and their numbers can be arranged according to actual needs. In addition, the floor skin 3 includes a front floor skin 31, a front floor rear compartment skin 32, a middle floor skin 33, and a rear floor skin 34 that are fixedly connected end to end. The front end of the front floor skin 31 is consistent with that of the front-engine, front-wheel-drive model. The front floor skin 31 is overlapped and welded to the front floor rear compartment skin 32. The rear axle hub 43 is located between the sixth crossbeam 26 and the seventh crossbeam 27.

[0040] The first clearance structure includes the space located beneath the front floor rear cargo cover 32, the middle floor cover 33, the rear floor cover 34, and the rear floor frame. In this embodiment, compared to existing front-engine, front-wheel-drive vehicles, the front floor rear cargo cover 32, the middle floor cover 33, the rear floor cover 34, and the rear floor frame are raised by 100mm, or other values ​​within the range of 90-110mm can be used.

[0041] In this embodiment, as Figures 11-12 As shown, the third clearance structure includes a clearance boss 52 located in the middle of the sixth crossbeam 26. The minimum distance between the edge of the clearance boss 52 and the edge of the rear axle wheel hub 43 is greater than 15mm. A reinforcing rib arranged in the transverse direction is provided on the side of the clearance boss 52 away from the rear axle wheel hub 43, which can improve the quality defects caused by the stacking of materials during the forming of the parts.

[0042] In this embodiment, as Figure 10As shown, the engine compartment assembly 1 includes a front windshield crossbeam 11, an instrument crossbeam 12, and a front bulkhead 13 connected and fixed from top to bottom. The fourth clearance structure includes a small front bulkhead bulge 14 located in the middle of the front bulkhead 13. The projected length of the small front bulkhead bulge 14 along the length of the vehicle is 150mm, or other values ​​within the range of 140-160mm can be used. The dimensions along the width and height of the vehicle are also increased accordingly. The minimum gap between the engine housing and the front bulkhead 13 is greater than 25mm, and the minimum gap between the front bulkhead 13 and the rear heater is greater than 15mm.

[0043] In this embodiment, as Figure 8 As shown, the left rear longitudinal beam assembly 203 and the right rear longitudinal beam assembly 204 are arranged in parallel. The distance L between the left rear longitudinal beam assembly 203 and the right rear longitudinal beam assembly 204 is 559mm. Other values ​​within the range of 550-570mm can also be used according to actual needs. The rear wheels of the front-engine front-wheel drive vehicle only need to use a single tire, while the rear wheels of the front-engine rear-wheel drive vehicle need to use dual rear tires 42. Therefore, the distance between the left rear longitudinal beam assembly 203 and the right rear longitudinal beam assembly 204 of the front-engine rear-wheel drive vehicle should be reduced by 170mm to avoid the installation space of the dual rear tires 42 and the leaf spring. The second avoidance structure includes the avoidance space set between the rear wheel cover 207 and the rear longitudinal beam assembly.

[0044] In this embodiment, as Figure 3 As shown, the rear floor panel 34 end and the rear tail beam outer plate 61 are connected by an L-shaped sill connecting plate 62. The rear tail beam outer plate 61 and the rear tail beam inner plate 63 together form a rear door opening 66. The end of the left rear longitudinal beam assembly 203 and the rear tail beam inner plate 63 are connected by a connecting torsion leg 64. The end of the left rear longitudinal beam assembly 203 and the sill connecting plate 62 are connected by an L-shaped end connecting plate 65. The sill connecting plate 62 and the end connecting plate 65 are spot welded together. Figure 4 Compared with existing technologies, the present invention adopts a stepped design by adding a threshold connecting plate 62 and an end connecting plate 65, which can ensure that the mounting surface of the rear door opening 66 remains unchanged, while also meeting the arrangement requirements of the rear drive shaft and the rear axle hub.

[0045] In this embodiment, as Figure 3 As shown, the distance d between the top of the rear floor panel 34 and the top of the rear tail beam outer plate 61 is 100mm. Its size is the same as the distance between the front floor rear panel 32, the middle floor panel 33, the rear floor panel 34, and the overall height of the rear floor frame, which can also be other values ​​within 90 to 110mm.

[0046] In this embodiment, as Figure 13As shown, the front floor skin 31 is designed with a central bulge structure 53 to avoid the gearbox. The edge of the central bulge structure 53 is provided with an elongated elliptical hole 531 for installing the shift lever sleeve. The length and width of the elongated ellipse are 68mm and 43mm respectively. In addition, compared with the front-engine front-wheel drive vehicle, the driver's human-machine H point remains unchanged to ensure driver comfort; it also needs to meet the requirements of the double seat arrangement in the passenger seat.

[0047] The above description merely illustrates implementation methods of the present invention and should not be construed as limiting the scope of the invention patent, nor as imposing any form of limitation on the structure of the embodiments of the present invention. It should be noted that those skilled in the art can make various changes and improvements without departing from the concept of the embodiments of the present invention, and these all fall within the protection scope of the embodiments of the present invention.

Claims

1. A floor welding assembly for a rear-wheel drive vehicle based on a front-engine, front-wheel drive modified version, characterized in that: The floor welding assembly (A) includes a cabin assembly (1), a floor frame assembly (2) and a floor skin (3). The ends of the cabin assembly (1) and the floor skin (3) are connected by welding. The floor skin (3) and the cabin assembly (1) are fixedly installed above the floor frame assembly (2). The floor frame assembly (2) is provided with a first clearance structure for the drive shaft (41) to pass through, a second clearance structure for the rear wheel dual tires (42) to be arranged, and a third clearance structure for the rear axle hub (43) to be arranged. The engine compartment assembly (1) is provided with a fourth clearance structure for the engine cooling pack to be arranged. The floor frame assembly (2) includes a front floor frame and a rear floor frame; the front floor frame includes a first crossbeam (21), a second crossbeam (22) and a third crossbeam (23) arranged in parallel from the front to the rear of the vehicle, and a left front longitudinal beam assembly (201) and a right front longitudinal beam assembly (202) fixedly connected to its left and right sides respectively; the rear floor frame includes a fourth crossbeam (24), a plurality of fifth crossbeams (25), a sixth crossbeam (26) of the same size, a plurality of seventh crossbeams (27) of the same size and a rear crossbeam (28), and a left rear longitudinal beam assembly (203) and a right rear longitudinal beam assembly (204) fixedly connected to its left and right sides respectively. The number of the fifth crossbeam (25) is four, the number of the seventh crossbeam (27) is three, the floor skin (3) includes a front floor skin (31), a front floor rear compartment skin (32), a middle floor skin (33) and a rear floor skin (34) that are fixedly connected end to end. The front end of the front floor skin (31) is consistent with that of the front-wheel drive vehicle. The front floor skin (31) and the front floor rear compartment skin (32) are overlapped and welded. The rear axle hub (43) is located between the sixth crossbeam (26) and the seventh crossbeam (27). The first clearance structure includes the space below the front floor rear compartment skin (32), the middle floor skin (33) and the rear floor skin (34) and the rear floor frame. The rear floor panel (34) end and the rear tail beam outer plate (61) are connected by an L-shaped sill connecting plate (62). The rear tail beam outer plate (61) and the rear tail beam inner plate (63) together form a back door opening (66). The end of the left rear longitudinal beam assembly (203) and the rear tail beam inner plate (63) are connected by a connecting torsion leg (64). The end of the left rear longitudinal beam assembly (203) and the sill connecting plate (62) are connected by an L-shaped end connecting plate (65). The sill connecting plate (62) and the end connecting plate (65) are connected together by spot welding.

2. The floor welding assembly for a rear-wheel drive vehicle based on a front-engine, front-wheel drive modification according to claim 1, characterized in that: The rear floor frame also includes a left front wheel arch assembly (205), a right front wheel arch assembly (206), a rear wheel arch (207), a first driveshaft mounting small longitudinal beam (208), and a second driveshaft mounting small longitudinal beam (209). The first driveshaft mounting small longitudinal beam (208) is fixedly disposed between the middle of the fourth crossbeam (24) and the middle of the fifth crossbeam (25). One end of the second driveshaft mounting small longitudinal beam (209) is fixed to the end of the first driveshaft mounting small longitudinal beam (208), and the other end is fixedly connected to the middle of the fifth crossbeam (25). The first crossbeam (21) A gearbox (44) is provided below the second crossbeam (22) and the third crossbeam (23). A fifth clearance structure for arranging the gearbox (44) is provided in the middle of the first crossbeam (21), the second crossbeam (22) and the third crossbeam (23). The fifth clearance structure includes an arc-shaped protrusion (51) located in the middle of the first crossbeam (21), the second crossbeam (22) and the third crossbeam (23). The size of the arc-shaped protrusion (51) is adapted to the size of the gearbox (44) housing. The gearbox (44) is located above the first crossbeam (21) and the second crossbeam (22).

3. The floor welding assembly for a rear-wheel drive vehicle based on a front-engine, front-wheel drive modification according to claim 1, characterized in that: The third avoidance structure includes an avoidance boss (52) located in the middle of the sixth crossbeam (26). The minimum distance between the edge of the avoidance boss (52) and the edge of the rear axle hub (43) is greater than 15mm. A reinforcing rib arranged in the transverse direction is provided on the side of the avoidance boss (52) away from the rear axle hub (43).

4. The floor welding assembly for a rear-wheel drive vehicle based on a front-engine, front-wheel drive modification as described in claim 1, characterized in that: The engine compartment assembly (1) includes a front windshield crossbeam (11), an instrument crossbeam (12), and a front bulkhead (13) connected and fixed from top to bottom. The fourth clearance structure includes a front bulkhead bulge (14) located in the middle of the front bulkhead (13). The projected length of the front bulkhead bulge (14) along the length of the vehicle is 140~160mm. The minimum gap between the engine housing and the front bulkhead (13) is greater than 25mm. The minimum gap between the front bulkhead (13) and the rear heater is greater than 15mm.

5. The floor welding assembly for a rear-wheel drive vehicle based on a front-engine, front-wheel drive modification according to claim 2, characterized in that: The left rear longitudinal beam assembly (203) and the right rear longitudinal beam assembly (204) are arranged in parallel, and the distance between the left rear longitudinal beam assembly (203) and the right rear longitudinal beam assembly (204) is 550~570mm. The second avoidance structure includes an avoidance space provided between the rear wheel arch (207) and the rear longitudinal beam assembly.

6. The floor welding assembly for a rear-wheel drive vehicle based on a front-engine, front-wheel drive modification according to claim 1, characterized in that: The distance d between the top of the rear floor skin (34) and the top of the rear tail beam outer plate (61) is 90~110mm.

7. The floor welding assembly for a rear-wheel drive vehicle based on a front-engine, front-wheel drive modification according to claim 1, characterized in that: The front floor skin (31) is designed with a middle bulge structure (53) to avoid the gearbox. The edge of the middle bulge structure (53) is provided with a gear shift wire sheath mounting hole (531) for the gear shift wire sheath to be installed.

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