Cabin and front floor force transmission structure and vehicle

Abstract

The application provides a cabin and front floor force transmission structure and a vehicle. The cabin and front floor force transmission structure comprises two parallelly arranged side force transmission paths. The side force transmission path comprises a front longitudinal beam assembly, a front longitudinal beam rear body assembly, a rocker assembly, a floor longitudinal beam assembly and a center tunnel. The front longitudinal beam rear body assembly comprises a front connecting part and three rear connecting parts. The front connecting part is connected with the front longitudinal beam assembly. The three rear connecting parts comprise a first rear connecting part, a second rear connecting part and a third rear connecting part. The first rear connecting part, the second rear connecting part and the third rear connecting part are connected with the rocker assembly, the floor longitudinal beam assembly and the center tunnel respectively. The parallelly arranged side force transmission paths can effectively disperse the load and improve the dynamic stiffness. Meanwhile, the connection structure between the front longitudinal beam rear body assembly and the rocker, the floor longitudinal beam and the center tunnel is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicles, in particular to a cabin and front floor force transmission structure and a vehicle. BACKGROUND

[0002] With the improvement of people's living standards, consumers have higher and higher requirements for the quality of automobiles. Structural durability, NVH (Noise, Vibration, Harshness), and collision safety have become key factors for measuring the quality of automobile bodies. The cabin and front floor force transmission structure is the most important part of the vehicle body. An efficient and excellent structure can not only provide high stiffness to improve durability, NVH, VD, and collision safety performance, but also improve the bending and torsional stiffness, modal, NTF / VTF, etc. of the vehicle body.

[0003] Currently, there are three major problems in the design of the cabin and front floor force transmission structure of an automobile: first, this part is the first barrier between the tire and the driver's cabin, and the skeleton structure is weak and cannot effectively isolate the transmission of tire excitation vibration and noise to the driver's cabin; second, the forward force transmitted by the front longitudinal beam passes through the front longitudinal beam rear body assembly, the rocker beam, and the front floor middle beam to form two longitudinal force transmission channels, and the third path is not connected by a longitudinal beam, and there is no stable force transmission channel. The connection of the force transmission path is not stable and smooth, which affects the torsional performance of the vehicle. Third, to meet the dynamic stiffness of the auxiliary frame, the joint design of the cabin and front floor force transmission structure is complex, the number of parts is large, the cost is high, and the effect is not good.

[0004] Therefore, it is necessary to provide an improved cabin and front floor force transmission structure and a vehicle to solve the above problems. SUMMARY

[0005] The present application provides a cabin and front floor force transmission structure and a vehicle with simple structure and efficient force transmission path.

[0006] The present application provides a cabin and front floor force transmission structure, comprising two side force transmission paths arranged side by side, the side force transmission path comprising a front longitudinal beam assembly, a front longitudinal beam rear body assembly, a rocker assembly, a floor longitudinal beam assembly, and a middle channel; the front longitudinal beam rear body assembly comprises a front connecting portion and three rear connecting portions, the front connecting portion being connected with the front longitudinal beam assembly; the three rear connecting portions comprise a first rear connecting portion, a second rear connecting portion, and a third rear connecting portion, the first rear connecting portion, the second rear connecting portion, and the third rear connecting portion being connected with the rocker assembly, the floor longitudinal beam assembly, and the middle channel, respectively.

[0007] Further, the front connecting portion and the first, second and third rear connecting portions form a first, second and third force transmission path respectively, and the rear body assembly of the front longitudinal beam forms a cavity, two sides of the cavity being provided with a first and second welding flange; the first and third force transmission paths are formed by the first and second welding flanges.

[0008] Further, the first, second and third rear connecting portions are arranged side by side at the rear edge of the cavity, the second rear connecting portion is connected to the front connecting portion, and the first and third rear connecting portions are arranged at two sides of the second rear connecting portion respectively.

[0009] Further, the cavity is provided with a left rear subframe reinforcement plate, a front end of the left rear subframe reinforcement plate being connected to the front connecting portion and forming the second force transmission path, and the left rear subframe reinforcement plate partially extends out of the cavity and overlaps with the floor longitudinal beam assembly.

[0010] Further, the rear side of the cavity is provided with a front wall left connecting plate reinforcement plate and a front wall left connecting plate arranged at two sides of the left rear subframe reinforcement plate respectively, the front wall left connecting plate reinforcement plate and the front wall left connecting plate jointly close the cavity, the front wall left connecting plate reinforcement plate forms a first transverse path connecting the first and second rear connecting portions, and the front wall left connecting plate forms a second transverse path connecting the second and third rear connecting portions.

[0011] Further, the left rear subframe reinforcement plate comprises a groove portion with a U-shaped cross section and two everted edges at the top of the groove portion, the height and width of the front part of the groove portion are greater than those of the rear part of the groove portion, and a subframe mounting threaded pipe is mounted at the front end of the groove portion.

[0012] Further, the rear body assembly of the front longitudinal beam further comprises a fourth rear connecting portion, the first, second, third and fourth rear connecting portions are arranged side by side at the rear edge of the cavity, the fourth rear connecting portion is arranged in the front-rear direction with the front connecting portion, the first and second rear connecting portions are arranged at the outer side of the fourth rear connecting portion, and the third rear connecting portion is arranged at the inner side of the fourth rear connecting portion; a fourth force transmission path is formed between the front connecting portion and the fourth rear connecting portion.

[0013] Further, the cavity is provided with a side reinforcing plate arranged in the front-rear direction, a front end of the side reinforcing plate is connected with the first welding flange, and the second force transmission path is formed by the first welding flange and the side reinforcing plate; a rear part of the side reinforcing plate extends out of the cavity and is overlapped with the floor longitudinal beam assembly; and the second rear connecting part is located on the side reinforcing plate.

[0014] Further, the cavity is provided with a middle reinforcing plate arranged in the front-rear direction, a rear part of the middle reinforcing plate forms the fourth rear connecting part; the middle reinforcing plate is located in the cavity and forms the fourth force transmission path; and a front end of the middle reinforcing plate is provided with a secondary frame mounting threaded pipe.

[0015] Further, the side reinforcing plate and the middle reinforcing plate each include a groove part in a U-shaped cross section and two everted edges located on top of the groove part.

[0016] Further, a rear side of the cavity is shielded by a front wall connecting plate, and the front wall connecting plate forms a transverse force transmission path sequentially connecting the first rear connecting part, the second rear connecting part, the fourth rear connecting part and the third rear connecting part.

[0017] Further, the front longitudinal beam rear body assembly includes an upper cover plate and a lower cover plate, and the upper cover plate and the lower cover plate are connected to enclose the cavity.

[0018] The application also provides a vehicle including the engine compartment and front floor force transmission structure.

[0019] The engine compartment and front floor force transmission structure of the application is connected with the rocker, the floor longitudinal beam and the middle channel to form a plurality of parallel side force transmission paths, the force transmission path is stable and efficient, and the dynamic stiffness of the secondary frame can be effectively improved; and the connection structure is simple. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a bottom view of the engine compartment and front floor force transmission structure of the exemplary embodiment of the application.

[0021] Figure 2 is Figure 1 is a partial enlarged view of the side force transmission path located on the left side of the vehicle.

[0022] Figure 3 is Figure 1 is a partial enlarged view of the side force transmission path located on the right side of the vehicle.

[0023] Figure 4 is Figure 3 is a perspective view of the partial enlarged view.

[0024] Figure 5 isFigure 1 FIG. 6 is a perspective view of the cabin and front floor force transmission structure shown in FIG. 5.

[0025] Figure 6 Figure 1 FIG. 7 is a perspective view of the cabin and front floor force transmission structure shown in FIG. 6 from another angle.

[0026] Figure 7 Figure 2 FIG. 8 is a perspective view of the subframe left rear reinforcement shown in FIG. 7.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 10, front longitudinal beam assembly; 20, front longitudinal beam rear body assembly; 21, front connecting part; 22, first rear connecting part; 23, second rear connecting part; 24, third rear connecting part; 25, cavity; 26, first welding flange; 27, second welding flange; 28, fourth rear connecting part; 30, rocker assembly; 40, floor longitudinal beam assembly; 50, middle channel; 61, first force transmission path; 62, second force transmission path; 63, third force transmission path; 64, first transverse path; 65, second transverse path; 66, fourth force transmission path; 67, transverse force transmission path; 71, subframe left rear reinforcement; 711, groove part; 712, outer flange; 713, assembly hole; 714, subframe mounting threaded tube; 72, front wall left connecting plate reinforcement; 73, front wall left connecting plate; 74, side reinforcement; 741, groove part; 742, outer flange; 75, middle reinforcement; 751, groove part; 752, outer flange; 753, mounting hole; 76, front wall connecting plate; 80, upper cover plate; 90, lower cover plate. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments (or, the implementation manners) of the present application will be clearly and completely described herein with reference to the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0030] If the terms related to directionality or positional relationship (such as up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.) are involved in the embodiments of the present application, such terms are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings); if the specific posture changes, the directionality or positional relationship also changes accordingly. In addition, the terms “first”, “second”, etc. involved in the embodiments of the present application are only used for the convenience of description, and cannot be understood as indicating or implying relative importance.

[0031] Referring to Figures 1 to 4 ​​As shown, the cabin and front floor force transmission structure includes two side force transmission paths arranged side by side. Each side force transmission path includes a front longitudinal beam assembly 10, a front longitudinal beam rear body assembly 20, a rocker assembly 30, a floor longitudinal beam assembly 40 and a center tunnel 50. The front longitudinal beam rear body assembly 20 includes a front connecting part 21 connected with the front longitudinal beam assembly 10 and three rear connecting parts including a first rear connecting part 22, a second rear connecting part 23 and a third rear connecting part 24 connected with the rocker assembly 30, the floor longitudinal beam assembly 40 and the center tunnel 50 respectively.

[0032] The front connecting part 21, the first rear connecting part 22, the second rear connecting part 23 and the third rear connecting part 24 form a first force transmission path 61, a second force transmission path 62 and a third force transmission path 63 respectively. The side force transmission path can effectively disperse the force transmitted by the front longitudinal beam assembly 10 to the rocker assembly 30, the floor longitudinal beam assembly 40 and the center tunnel 50, so that the stress is evenly distributed, and the dynamic stiffness and mode of the overall structure of the vehicle are improved. At the same time, the design of the front connecting part 21 and the three rear connecting parts effectively disperses the load, which helps to improve the load-carrying capacity of the overall structure, improve the fatigue endurance life and safety collision requirements, and meet the performance requirements of the vehicle in various extreme working conditions.

[0033] The front longitudinal beam rear body assembly 20 forms a cavity 25, and the first welding flange 26 and the second welding flange 27 are arranged on both sides of the cavity 25. The first force transmission path 61 and the third force transmission path 63 are formed by the first welding flange 26 and the second welding flange 27.

[0034] The arrangement of the first welding flange 26 and the second welding flange 27 makes the cabin and front floor force transmission structure simple in process, only needs to be welded and fixed, does not need to increase the working position and working hours of general assembly to solve the NVH road noise problem, has low cost, and can improve the welding quality and stability. At the same time, by forming the first force transmission path 61 and the third force transmission path 63, different directions of external force can be more effectively dispersed and borne, and the overall bending resistance is improved. Each force transmission path can independently bear and disperse the load, so that the local stress concentration on a single path is reduced, and the overall stability of the structure is improved.

[0035] The front longitudinal beam rear body assembly 20 includes an upper cover plate 80 and a lower cover plate 90 connected to enclose the cavity 25. The cavity 25 can effectively solve the NVH noise problem of the vehicle body subframe part, and can reduce the NVH road noise by 57 db. The first welding flange 26 and the second welding flange 27 are arranged on the lower cover plate 90.

[0036] The first rear connecting part 22, the second rear connecting part 23 and the third rear connecting part 24 are arranged side by side at the rear edge of the cavity 25. The second rear connecting part 23 is connected with the front connecting part 21 and arranged in the front-rear direction, and the front connecting part 21 is arranged at the front side of the second rear connecting part 23, which can enhance the stability of the front longitudinal beam rear body assembly 20 under the front load. The first rear connecting part 22 and the third rear connecting part 24 are arranged at both sides of the second rear connecting part 23 respectively.

[0037] Figure 2 It is an enlarged view of the side force transmission path arranged at the left side of the vehicle. The cavity 25 is provided with a rear left subframe reinforcing plate 71 arranged in the front-rear direction. The front end of the rear left subframe reinforcing plate 71 is connected to the front connecting part 21 and forms the second force transmission path 62, and the rear left subframe reinforcing plate 71 partially extends out of the cavity 25 and overlaps with the floor longitudinal beam assembly 40. The second rear connecting part 23 is located on the rear left subframe reinforcing plate 71.

[0038] Compared with the traditional structure, the cavity at this position is not continuous, the force transmission path is not clear and discontinuous, the force transmission efficiency is low, the structure is complex, and the rear part has a large area without skeleton reinforcing structure, only a thin floor panel is connected, which cannot effectively transmit the forward force. The arrangement of the rear left subframe reinforcing plate 71 significantly improves the rigidity of the cavity 25, and forms a stable force transmission path between the front connecting part 21 and the floor longitudinal beam assembly 40.

[0039] The second force transmission path 62 is located between the first force transmission path 61 and the third force transmission path 63, and the first force transmission path 61, the second force transmission path 62 and the third force transmission path 63 form a chevron-shaped structure. The rocker assembly 30, the floor longitudinal beam assembly 40 and the center tunnel 50 corresponding to the three force transmission paths also form a chevron-shaped force transmission structure. The main key parts of the side force transmission path are made of advanced high-strength steel or super-high-strength hot-formed steel plate, and the chevron-shaped force transmission path is used as a skeleton, and a relatively thin steel plate is laid on the middle or surface.

[0040] The three force transmission path structures are simple and complete, the cavity area is uniform, the force transmission is obviously efficient. Moreover, the parts are reasonably overlapped, which can effectively transmit energy, disperse force and improve the performance of this part, the road noise and vibration suppression effect of NVH is obvious, and the safety and structure durability improvement effect is obvious. Not only the performance requirements are considered, but also a large amount of arrangement space is saved to meet the arrangement requirements of carbon tank and subwoofer.

[0041] The rear side of the cavity 25 is provided with a front wall left connecting plate reinforcing plate 72 and a front wall left connecting plate 73 respectively located on both sides of the sub-frame left rear reinforcing plate 71. The front wall left connecting plate reinforcing plate 72 and the front wall left connecting plate 73 jointly close the rear part of the cavity 25. The front wall left connecting plate reinforcing plate 72 forms the first transverse path 64 connecting the first rear connecting part 22 and the second rear connecting part 23. The front wall left connecting plate 73 forms the second transverse path 65 connecting the second rear connecting part 23 and the third rear connecting part 24.

[0042] The first force transmission path 61, the second force transmission path 62 and the first transverse path 64 form a first force transmission ring. The second force transmission path 62, the third force transmission path 63 and the second transverse path 65 form a second force transmission ring. The load can be effectively dispersed between different paths, reducing local stress concentration and improving the durability of the structure. When external impact or load imbalance occurs, multiple force transmission channels can effectively transmit and absorb energy, improving the safety of the vehicle.

[0043] In some embodiments, continuous reinforcing ribs can be added inside the cavity 25, i.e. on the upper cover plate 80 or the lower cover plate 90, to optimize stress distribution and improve structural rigidity.

[0044] As shown in Figures 5 to 7 The sub-frame left rear reinforcing plate 71 includes a groove part 711 with a U-shaped cross section and two everted edges 712 on the top of the groove part 711. The height and width of the front part of the groove part 711 are greater than those of the rear part of the groove part 711. The front end of the groove part 711 is provided with an assembly hole 713, and a sub-frame mounting threaded pipe 714 is installed in the assembly hole 713.

[0045] The groove part 711 increases the space while meeting the force transmission path and structural strength requirements. The height of the front part of the groove part 711 is 92 mm, and the width is 91 mm. The height of the rear part of the groove part 711 is 64 mm, and the width is 66 mm. A front high-thick bottom layout is adopted, and the two everted edges 712 are connected to the rocker assembly 30 and the center tunnel 50 through the front floor, respectively, so that the stress on both sides is more stable, thereby better meeting the requirement of forward force transmission.

[0046] Figure 3 The enlarged view of the side force transmission path is set on the right side of the vehicle. The front longitudinal beam rear body assembly 20 further includes a fourth rear connecting part 28. The first rear connecting part 22, the second rear connecting part 23, the third rear connecting part 24 and the fourth rear connecting part 28 are arranged side by side at the rear edge of the cavity 25. The fourth rear connecting part 28 and the front connecting part 21 are arranged in the front-rear direction, and the front connecting part 21 is located on the front side of the fourth rear connecting part 28. The first rear connecting part 22 and the second rear connecting part 23 are arranged on the outer side of the fourth rear connecting part 28, and the third rear connecting part 24 is arranged on the inner side of the fourth rear connecting part 28. The fourth force transmission path 66 is formed between the front connecting part 21 and the fourth rear connecting part 28.

[0047] By arranging multiple connection portions in parallel at the rear edge of the cavity 25, in particular the fourth rear connection portion 28 and the front connection portion 21 form the fourth force transmission path 66, the connection strength and stability of the overall structure can be effectively improved.

[0048] The cavity 25 is provided with a side reinforcement plate 74 arranged in the front-rear direction, the front end of the side reinforcement plate 74 is connected with the first welded flange 26, and the second force transmission path 62 is formed by the first welded flange 26 and the side reinforcement plate 74. The rear part of the side reinforcement plate 74 extends out of the cavity 25 and overlaps with the floor longitudinal beam assembly 40. The second rear connection portion 23 is located on the side reinforcement plate 74.

[0049] The arrangement of the side reinforcement plate 74 of the embodiment of the present application significantly improves the rigidity of the cavity 25, and the stress of the front connection portion 21 is sequentially transmitted to the cavity 25, the side reinforcement plate 74 and the floor longitudinal beam assembly 40. The force transmission path is stable and efficient, which can effectively transmit and disperse the load, and improve the overall load-carrying capacity and anti-deformation capacity.

[0050] The side reinforcement plate 74 includes a groove portion 741 with a U-shaped cross section and two everted edges 742 located at the top of the groove portion 741. The two everted edges 742 are connected with the rocker assembly 30 and the center tunnel 50 through the front floor respectively.

[0051] The cavity 25 is also provided with a middle reinforcement plate 75 arranged in the front-rear direction, which is located in the cavity 25 and forms the fourth force transmission path 66. On the basis of the H-shaped force transmission structure, one force transmission path is added. The middle reinforcement plate 75 includes a groove portion 751 with a U-shaped cross section and two everted edges 752 located at the top of the groove portion 751. The front end of the middle reinforcement plate 75 is provided with a mounting hole 753, and a secondary frame mounting threaded pipe 714 is mounted in the mounting hole 753.

[0052] The rear side of the cavity 25 is shielded by a front wall connecting plate 76, and the rear part of the middle reinforcement plate 75 is connected with the front wall connecting plate 76 to form the fourth rear connection portion 28. The front wall connecting plate 76 forms a horizontal force transmission path 67 which sequentially connects the first rear connection portion 22, the second rear connection portion 23, the fourth rear connection portion 28 and the third rear connection portion 24.

[0053] The third force transmission path 63, the fourth force transmission path 66 and the horizontal force transmission path 67 form the first force transmission ring. The fourth force transmission path 66, the horizontal force transmission path 67 and the first force transmission path 61 form the second force transmission ring. The first force transmission path 61, the second force transmission path 62 and the horizontal force transmission path 67 form the third force transmission ring. The load can be effectively dispersed between different paths, reducing local stress concentration and improving the durability of the structure. When external impact or load imbalance occurs, multiple force transmission channels can effectively transmit and absorb energy, improving the safety of the vehicle.

[0054] In the force transmission structure between the engine compartment and the front floor of this application, there is no need to patch additionally, increase the material thickness, and apply structural adhesive to solve the structural durability problem. Due to the reasonable frame structure and good design, the overall stiffness of the structure at this location is good, and there are no problems such as abnormal noise, solder joint, and sheet metal fatigue cracking caused by torsional stiffness problems under extreme working conditions.

[0055] In the force transmission structure between the engine compartment and the front floor of this application, both of the two side force transmission paths form two "chuan" - shaped force transmission paths, which can effectively disperse the load and effectively improve the dynamic stiffness of the subframe. At the same time, the connection structure between the front longitudinal beam, the sill, the floor longitudinal beam, and the middle channel is simple, reducing local stress concentration.

[0056] This application also provides a vehicle, including the above - mentioned force transmission structure between the engine compartment and the front floor.

[0057] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent replacements, improvements, etc., made within the spirit and principle of this application shall be included within the scope of protection of this application.

Claims

1. A force transmission structure between the cabin and the forward floor, characterized in that, This includes two parallel side force transmission paths, each comprising a front longitudinal beam assembly, a rear body assembly of the front longitudinal beam, a sill assembly, a floor longitudinal beam assembly, and a central channel. The rear body assembly of the front longitudinal beam includes a front connecting part and three rear connecting parts, the front connecting part connecting to the front longitudinal beam assembly. The three rear connecting parts include a first rear connecting part, a second rear connecting part, and a third rear connecting part, which respectively connect to the sill assembly, the floor longitudinal beam assembly, and the central channel. The front connecting part, along with the first, second, and third rear connecting parts, forms a first force transmission path, a second force transmission path, and a third force transmission path, respectively. The rear body assembly of the beam forms a cavity; a left rear reinforcing plate of the subframe is provided in the cavity, the front end of the left rear reinforcing plate of the subframe is connected to the front connecting part and forms the second force transmission path, and a portion of the left rear reinforcing plate of the subframe extends out of the cavity and overlaps with the floor longitudinal beam assembly; the rear side of the cavity is provided with a front left connecting plate reinforcing plate and a front left connecting plate located on both sides of the left rear reinforcing plate of the subframe, and the front left connecting plate reinforcing plate and the front left connecting plate together close the cavity; the front left connecting plate reinforcing plate forms a first lateral path connecting the first rear connecting part and the second rear connecting part; the front left connecting plate forms a second lateral path connecting the second rear connecting part and the third rear connecting part.

2. The cabin and forward floor force transmission structure according to claim 1, characterized in that, The cavity is provided with a first welding flange and a second welding flange on both sides; the first force transmission path and the third force transmission path are formed by the first welding flange and the second welding flange.

3. The cabin and forward floor force transmission structure according to claim 1, characterized in that, The first rear connecting part, the second rear connecting part, and the third rear connecting part are arranged side by side on the rear edge of the cavity. The second rear connecting part is connected to the front connecting part, and the first rear connecting part and the third rear connecting part are respectively arranged on both sides of the second rear connecting part.

4. The cabin and forward floor force transmission structure according to claim 1, characterized in that, The left rear reinforcing plate of the subframe includes a U-shaped groove and two outward flanges at the top of the groove; the height and width of the front part of the groove are greater than the height and width of the rear part of the groove; a subframe mounting threaded tube is installed at the front end of the groove.

5. A force transmission structure between the cabin and the forward floor, characterized in that, The system includes two parallel lateral force transmission paths, each comprising a front longitudinal beam assembly, a rear front longitudinal beam body assembly, a sill assembly, a floor longitudinal beam assembly, and a central channel. The rear front longitudinal beam body assembly includes a front connecting part and three rear connecting parts, the front connecting part connecting to the front longitudinal beam assembly. The three rear connecting parts are a first rear connecting part, a second rear connecting part, and a third rear connecting part, each connecting to the sill assembly, the floor longitudinal beam assembly, and the central channel, respectively. The front connecting part connects to the first rear connecting part, the second rear connecting part, and the third rear connecting part. The connecting parts respectively form a first force transmission path, a second force transmission path, and a third force transmission path. The rear body assembly of the front longitudinal beam forms a cavity. The rear body assembly of the front longitudinal beam also includes a fourth rear connecting part. The first, second, third, and fourth rear connecting parts are arranged side by side at the rear edge of the cavity. The fourth rear connecting part is arranged along the front-rear direction with the front connecting part. The first and second rear connecting parts are located on the outer side of the fourth rear connecting part, and the third rear connecting part is located on the inner side of the fourth rear connecting part. A fourth force transmission path is formed between the front connecting part and the fourth rear connecting part.

6. The cabin and forward floor force transmission structure according to claim 5, characterized in that, The cavity is provided with a first welding flange and a second welding flange on both sides; the first force transmission path and the third force transmission path are formed by the first welding flange and the second welding flange; the cavity is provided with a side reinforcing plate arranged in the front-rear direction, the front end of the side reinforcing plate is connected to the first welding flange, the second force transmission path is formed by the first welding flange and the side reinforcing plate; the rear part of the side reinforcing plate extends out of the cavity and overlaps with the floor longitudinal beam assembly; the second rear connection part is located on the side reinforcing plate.

7. The cabin and forward floor force transmission structure according to claim 6, characterized in that, The cavity is provided with a central reinforcing plate arranged in the front-rear direction, and the rear part of the central reinforcing plate forms the fourth rear connecting part; the central reinforcing plate is located in the cavity and forms the fourth force transmission path; a subframe mounting threaded tube is installed at the front end of the central reinforcing plate.

8. The cabin and forward floor force transmission structure according to claim 7, characterized in that, Both the side reinforcing plate and the middle reinforcing plate include a U-shaped groove and two outward flanges located at the top of the groove.

9. The cabin and forward floor force transmission structure according to claim 5, characterized in that, The rear side of the cavity is shielded by a front connecting plate, which forms a lateral force transmission path that sequentially connects the first rear connecting part, the second rear connecting part, the fourth rear connecting part, and the third rear connecting part.

10. The cabin and forward floor force transmission structure according to claim 5, characterized in that, The rear body assembly of the front longitudinal beam includes an upper cover plate and a lower cover plate, the upper cover plate and the lower cover plate being connected to form the cavity.

11. A vehicle, characterized in that, Includes the cabin and forward floor force transmission structure as described in any one of claims 1 to 10.

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