Rear doorsill structure and vehicle

Abstract

The utility model provides a rear doorsill structure and vehicle, including doorsill beam body, rear floor longitudinal beam front section and rear floor longitudinal beam front section inner plate, doorsill beam body is connected to the outside of rear floor longitudinal beam front section, rear floor longitudinal beam front section inner plate is connected to the inside of rear floor longitudinal beam front section, and rear floor longitudinal beam front section inner plate is connected to the inside of rear floor longitudinal beam front section. A cavity is defined by the doorsill beam body, the rear floor longitudinal beam front section and the rear floor longitudinal beam front section inner plate. An inner concave cavity is formed in the inner side of the doorsill beam body, and the cavity bottom wall of the inner concave cavity is connected with the front section of the rear floor longitudinal beam. According to the rear doorsill structure, the inner concave cavity is formed in the doorsill beam body to provide the receding space for installation of the front section of the rear floor longitudinal beam, a step structure can be formed on the doorsill beam body due to the arrangement of the inner concave cavity, the strength of the doorsill beam body can be enhanced, positioning connection between the doorsill beam body and the front section of the rear floor longitudinal beam can be achieved, and the rear doorsill structure is convenient to use. The structure is also beneficial to expanding the internal space of the cavity, is beneficial to enhancing the side impact resistance of the structure, and improves the overall safety of the vehicle.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle door sill beams, and more specifically relates to a rear door sill structure and a vehicle. Background Art

[0002] As people's requirements for vehicle safety performance increase, the structural strength, stiffness and collision performance of the threshold beam, as an important component of the vehicle, play a vital role in the safety of the vehicle and directly affect the safety factor of the entire vehicle.

[0003] In order to improve the structural strength of the sill beam and increase the ability of the sill beam to withstand side impact, the existing technology generally increases the material thickness and adopts a high-strength steel plate design. Some companies also use structures such as reinforcement boxes to achieve the purpose of increasing strength. However, the above structure does not have a significant effect on the reinforcement of the rear sill structure, and also increases the overall weight of the sill beam, which is not conducive to the lightweight design of the vehicle. Utility Model Content

[0004] The utility model aims to provide a rear door sill structure and a vehicle, which can improve the structural strength of the door sill beam without increasing material consumption, thereby realizing a lightweight design of the vehicle.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a rear door sill structure, including a door sill beam body, a front section of a rear floor longitudinal beam and an inner plate of the front section of the rear floor longitudinal beam, the door sill beam body is connected to the outer side of the front section of the rear floor longitudinal beam, the inner plate of the front section of the rear floor longitudinal beam is connected to the inner side of the front section of the rear floor longitudinal beam, the door sill beam body, the front section of the rear floor longitudinal beam and the inner plate of the front section of the rear floor longitudinal beam enclose a cavity opening upward, wherein an inner concave cavity is provided on the inner side of the door sill beam body, and the bottom wall of the concave cavity is connected to the front section of the rear floor longitudinal beam.

[0006] In a possible implementation, the inner concave cavity extends in the front-to-rear direction and penetrates downward through the bottom wall of the door sill beam body, and the rear portion of the front section of the rear floor longitudinal beam is connected to the inner concave cavity.

[0007] In some embodiments, a guide surface is provided at the front end of the inner concave cavity, and the guide surface gradually extends from rear to front toward the center axis of the vehicle body, and a connecting surface connected to the guide surface is provided on the front section of the rear floor longitudinal beam.

[0008] In some embodiments, the front section of the rear floor longitudinal beam also has a limiting portion, which extends forward to the protruding rocker beam body, is bent toward the outside of the vehicle body and contacts the rear edge of the rocker beam body, and is used to limit the rocker beam body in the front and rear directions.

[0009] In a possible implementation, a reinforcing plate extending in the left-right direction of the vehicle body is provided in the cavity, and two side edges of the reinforcing plate are respectively connected to the sill beam body and the inner plate of the front section of the rear floor longitudinal beam.

[0010] In some embodiments, a bent portion bent backward is provided on the outer periphery of the reinforcing plate, the bottom surface of the bent portion is connected to the top surface of the front section of the rear floor longitudinal beam, and the opposite side walls of the bent portion are respectively connected to the door sill beam body and the inner plate of the front section of the rear floor longitudinal beam.

[0011] In one possible implementation, the rear sill structure also includes a rear suspension longitudinal arm mounting frame, which is located on the rear side of the reinforcement plate, and the two side edges of the rear suspension longitudinal arm mounting frame are respectively connected to the sill beam body and the front inner plate of the rear floor longitudinal beam in a one-to-one correspondence, and the front side of the rear suspension longitudinal arm mounting frame is connected to an auxiliary support plate.

[0012] In a possible implementation, a vertically penetrating positioning hole is provided on the front section of the rear floor longitudinal beam, a plurality of positioning holes are provided at intervals along the front-to-rear direction, and the positioning holes are respectively provided close to one side of the door sill beam body.

[0013] In a possible implementation, a front end of an inner plate of a front section of the rear floor longitudinal beam is provided with a reinforcing ear bent toward the center axis of the vehicle body, and a matching portion that is fitted and connected to the reinforcing ear is provided on the front section of the rear floor longitudinal beam.

[0014] Compared with the prior art, the scheme shown in the embodiment of the present application provides a rear sill structure in which an inner concave cavity is arranged on the sill beam body to provide a clearance space for the installation of the front section of the rear floor longitudinal beam. The arrangement of the inner concave cavity can form a step structure on the sill beam body, which not only helps to enhance the strength of the sill beam body itself, but also can achieve a positioning connection with the front section of the rear floor longitudinal beam. At the same time, the above structure also helps to expand the internal space of the cavity, facilitates structural layout, enhances the ability of the rear sill structure to resist side collisions, and improves the overall safety of the vehicle.

[0015] The utility model also provides a vehicle, which includes a rear sill structure. The vehicle provides a space for installing the front section of the rear floor longitudinal beam by setting an inner concave cavity on the sill beam body. The setting of the inner concave cavity can form a step structure on the sill beam body, which not only helps to enhance the strength of the sill beam body itself and facilitates the positioning and connection with the front section of the rear floor longitudinal beam, but also helps to expand the internal space of the cavity, facilitates the structural layout, and improves the overall safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of a top view of a rear door sill structure provided in an embodiment of the utility model;

[0018] Figure 2 For the utility model embodiment Figure 1 Schematic diagram of the explosion structure from another angle;

[0019] Figure 3 For the utility model embodiment Figure 1 A partial enlarged structural diagram of the middle and rear door sill structure at another angle;

[0020] Figure 4 For the utility model embodiment Figure 1 An enlarged structural diagram of the middle sill beam body;

[0021] Figure 5 For the utility model embodiment Figure 1 An enlarged structural diagram of the front section of the center-rear floor longitudinal beam;

[0022] Figure 6 For the utility model embodiment Figure 1 An enlarged structural diagram of the front inner plate of the center-rear floor longitudinal beam;

[0023] Figure 7 For the utility model embodiment Figure 1 An enlarged structural diagram of the middle reinforcement plate;

[0024] Figure 8 For the utility model embodiment Figure 1 Schematic diagram of the enlarged structure of the auxiliary support plate.

[0025] Among them, the reference numerals in the figure are:

[0026] 1. Door sill beam body; 11. Inner concave cavity; 12. Guide surface; 13. Avoidance cavity; 2. Front section of rear floor longitudinal beam; 21. Cavity; 22. Connection surface; 23. Positioning hole; 24. Matching part; 25. Limiting part; 3. Inner plate of front section of rear floor longitudinal beam; 31. Reinforcement ear; 4. Reinforcement plate; 41. Bending part; 42. Reinforcement rib; 5. Rear suspension longitudinal arm mounting bracket; 6. Auxiliary support plate; 61. Side connection part; 62. Lower connection part. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] In the claims, specification and the above-mentioned drawings of the present utility model, the terms "front" and "rear" are the same as the front-to-back direction of the vehicle body, "left" and "right" are the same as the left-to-right direction of the vehicle body, and "up" and "down" are the same as the up-down direction of the vehicle body; the term "inside" refers to the direction toward the central axis of the vehicle body, and the term "outside" refers to the direction away from the central axis of the vehicle body, wherein the central axis of the vehicle body is parallel to the front-to-back direction of the vehicle body. The remaining directional words, unless otherwise clearly defined, such as the use of the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "clockwise", "counterclockwise", "high", "low" and the like to indicate the direction or position relationship are based on the direction and position relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, so they cannot be understood as limiting the specific protection scope of the present utility model.

[0029] Please also read Figures 1 to 8 The rear door sill structure and the vehicle provided by the utility model are now described. The rear door sill structure includes a door sill beam body 1, a rear floor longitudinal beam front section 2 and a rear floor longitudinal beam front section inner plate 3, the door sill beam body 1 is connected to the outer side of the rear floor longitudinal beam front section 2, the rear floor longitudinal beam front section inner plate 3 is connected to the inner side of the rear floor longitudinal beam front section 2, and the door sill beam body 1, the rear floor longitudinal beam front section 2 and the rear floor longitudinal beam front section inner plate 3 enclose a cavity 21 with an opening upward;

[0030] An inner concave cavity 11 is provided on the inner side of the sill beam body 1 , and a bottom wall of the inner concave cavity 11 is connected to the front section 2 of the rear floor longitudinal beam.

[0031] Compared with the prior art, the rear sill structure provided in the present embodiment provides a recessed cavity 11 on the sill beam body 1 to provide a clearance space for the installation of the front section 2 of the rear floor longitudinal beam. The provision of the recessed cavity 11 can form a step structure on the sill beam body 1, which not only helps to enhance the strength of the sill beam body 1, but also can achieve a positioning connection with the front section 2 of the rear floor longitudinal beam. At the same time, the above structure also helps to expand the internal space of the cavity 21, facilitates structural layout, enhances the ability of the rear sill structure to resist side collisions, and improves the overall safety of the vehicle.

[0032] In this embodiment, the sill beam body 1 is connected to the outer side of the front section 2 of the rear floor longitudinal beam (i.e., the side away from the center axis of the vehicle body), the inner plate 3 of the front section of the rear floor longitudinal beam is connected to the inner side of the front section 2 of the rear floor longitudinal beam (i.e., the side close to the center axis of the vehicle body), and the two side edges of the front section 2 of the rear floor longitudinal beam are respectively connected to the lower part of the sill beam body 1 and the inner plate 3 of the front section of the rear floor longitudinal beam, and the three can be combined to form a cavity 21 with an upward opening.

[0033] By providing an inner cavity 11 sunken toward the outer side of the vehicle body on the sill beam body 1, the inner cavity 11 can extend a certain length in the front-rear direction of the vehicle body or can be provided through the sill beam body 1 to form a step structure, thereby enhancing the structural strength of the sill beam body 1.

[0034] At the same time, the setting of the inner concave cavity 11 provides a basis for the expansion of the cavity 21 toward the outside of the vehicle body, which can effectively increase the internal space of the cavity 21, facilitate the subsequent setting of positioning holes 23 and other structures on the bottom surface of the front section 2 of the rear floor longitudinal beam, and also facilitate the formation of a matching or connecting structure with external components, thereby realizing effective use of space and improving the convenience of structural layout.

[0035] In some possible implementations, the above-mentioned characteristic inner cavity 11 is adopted as follows Figure 2 and Figure 4 See the structure shown. Figure 2 and Figure 4 The inner concave cavity 11 extends in the front-to-rear direction and penetrates downward through the bottom wall of the door sill beam body 1 . The rear portion of the front section 2 of the rear floor longitudinal beam is connected to the inner concave cavity 11 .

[0036] In this embodiment, the inner concave cavity 11 extends in the front-to-back direction and extends downward to the lower edge of the sill beam body 1, so as to cooperate with the front section 2 of the rear floor longitudinal beam from the upper and lower directions, thereby improving the convenience of installation between the two. At the same time, the top wall of the inner concave cavity 11 can also be used to limit the front section 2 of the rear floor longitudinal beam in the upper and lower directions, thereby further improving the convenience of positioning. At the same time, the above arrangement can make the bottom surface of the front section 2 of the rear floor longitudinal beam flush with the bottom surface of the sill beam body 1, thereby improving the reliable connection with the vehicle body.

[0037] In some embodiments, the above-mentioned characteristic inner cavity 11 can be used as follows Figure 2 and Figure 4 See the structure shown. Figure 2 and Figure 4 A guide surface 12 is provided at the front end of the inner concave cavity 11 , and the guide surface 12 gradually extends from the rear to the front toward the center axis of the vehicle body, and a connecting surface 22 connected to the guide surface 12 is provided on the front section 2 of the rear floor longitudinal beam.

[0038] In this embodiment, the guide surface 12 at the front end of the inner concave cavity 11 can be fitted with the connection surface 22 of the front section of the rear floor longitudinal beam 2, and the two are welded and connected, thereby improving the reliability of the connection between the sill beam body 1 and the front section of the rear floor longitudinal beam 2. Since the guide surface 12 gradually tilts toward the center axis of the vehicle body while extending forward, it can form a limit in the front-to-back direction with the connection surface 22, which facilitates the positioning between the sill beam body 1 and the front section of the rear floor longitudinal beam 2 during installation, and helps to improve the connection efficiency.

[0039] Furthermore, since the front section 2 of the rear floor longitudinal beam extends forward to the outside of the inner concave cavity 11, an avoidance cavity 13 connected to the inner concave cavity 11 is also provided at the bottom of the sill beam body 1 for the position where the guide surface is provided. The avoidance cavity 13 forms a structural avoidance for the portion where the front section 2 of the rear floor longitudinal beam extends forward from the inner concave cavity 11, thereby ensuring that the guide surface and the connecting surface 22 can fully fit together and facilitate welding connection.

[0040] On the contact of the above structure, see Figure 3 and Figure 5 The front section 2 of the rear floor longitudinal beam also has a limiting portion 25, which extends forward to protrude from the sill beam body 1. The limiting portion 25 is bent toward the outside of the vehicle body and contacts the rear edge of the sill beam body 1. The limiting portion 25 is used to limit the sill beam body 1 in the front-rear direction.

[0041] The setting of the limiting portion 25 can limit the front and rear position of the rear edge of the sill beam body 1. Combined with the cooperation of the guide surface 12 and the connecting surface 22, the front and rear positions of the sill beam body 1 and the front section 2 of the rear floor longitudinal beam can be effectively limited, thereby improving the convenience of installation and connection operations, improving the accuracy of component positioning, and ensuring the reliability of welding connections.

[0042] In some possible implementations, the characteristic cavity 21 is as follows: Figures 1 to 3 See the structure shown. Figures 1 to 3 A reinforcing plate 4 extending in the left-right direction of the vehicle body is provided in the cavity 21, and both side edges of the reinforcing plate 4 are respectively connected to the sill beam body 1 and the front inner plate 3 of the rear floor longitudinal beam.

[0043] In this embodiment, the reinforcing plate 4 disposed in the cavity 21 can improve the connection strength of the peripheral components of the cavity 21 and improve the integrity of the rear sill structure. The reinforcing plate 4 is disposed in the up-down direction and extends in the left-right direction of the vehicle body, forming a support function in the left-right direction in the cavity 21, improving the structural strength of the rear sill structure in the corresponding direction, and helping to enhance the ability of the rear sill structure to resist side impact. The number of reinforcing plates 4 can be set according to the collision standard of the vehicle.

[0044] Two or more reinforcing plates 4 may be provided, and two adjacent reinforcing plates 4 are spaced a certain distance apart in the front-rear direction of the vehicle body, so that a nearly rectangular reinforcing structure is formed inside the cavity 21, thereby effectively enhancing the strength of the rear door sill structure and improving the safety performance of the vehicle.

[0045] In some embodiments, the above-mentioned feature reinforcement plate 4 can be used as follows Figure 7 See the structure shown. Figure 7 The outer periphery of the reinforcing plate 4 is provided with a bent portion 41 bent backward, the bottom surface of the bent portion 41 is connected to the top surface of the front section 2 of the rear floor longitudinal beam, and the opposite side walls of the bent portion 41 are respectively connected to the door sill beam body 1 and the inner plate 3 of the front section of the rear floor longitudinal beam.

[0046] In this embodiment, the setting of the bent portion 41 can not only increase the structural strength of the reinforcing plate 4, but also facilitate the effective connection with the inner wall of the cavity 21. Specifically, the bent portion 41 is integrally formed at the upper and lower edges and the two side edges of the reinforcing plate 4, the bent portion 41 located at the lower side edge of the reinforcing plate 4 is attached to and welded to the top surface of the front section 2 of the rear floor longitudinal beam, and the bent portion 41 located at the two side edges of the reinforcing plate 4 is attached to and welded to the side surfaces of the door sill beam body 1 and the inner plate 3 of the front section of the rear floor longitudinal beam in a one-to-one correspondence, which is convenient for increasing the welding connection surface 22 and forming a stable support inside the cavity 21.

[0047] Furthermore, the reinforcing plate 4 is provided with reinforcing ribs 42 extending in the left-right direction of the vehicle body, and a plurality of reinforcing ribs 42 are provided at intervals in the up-down direction. The reinforcing ribs 42 are protruded toward the front or rear side of the vehicle body, which can achieve the effect of increasing the structural strength.

[0048] For some possible implementations, see Figure 1 , Figure 2 and Figure 8 The rear sill structure also includes a rear suspension longitudinal arm mounting frame 5, which is located at the rear side of the reinforcement plate 4. The two side edges of the rear suspension longitudinal arm mounting frame 5 are respectively connected to the sill beam body 1 and the front inner plate 3 of the rear floor longitudinal beam in a one-to-one correspondence, and the front side of the rear suspension longitudinal arm mounting frame 5 is connected to an auxiliary support plate 6.

[0049] In this embodiment, the rear portion of the cavity 21 is used to install the rear suspension longitudinal arm mounting frame 5, which is used to be connected to the rear suspension longitudinal arm to achieve effective installation of the rear suspension longitudinal arm. The left and right sides of the rear suspension longitudinal arm mounting frame 5 are respectively connected to the sill beam body 1 and the front inner plate 3 of the rear floor longitudinal beam in a one-to-one correspondence, playing a structural reinforcement role in the direction of the vehicle body.

[0050] At the same time, the front side of the rear suspension longitudinal arm mounting frame 5 is connected with an auxiliary support plate 6, and the setting of the auxiliary support plate 6 further improves the reliability of the connection between the rear suspension longitudinal arm mounting frame 5 and the inner wall of the cavity 21. The two sides of the auxiliary support plate 6 are connected with side connecting parts 61 bent forward, and the lower edge of the auxiliary support plate 6 is connected with a lower connecting part 62 bent forward. The side connecting parts 61 and the lower connecting part 62 of the auxiliary support plate 6 form a structural reinforcement effect on the auxiliary support plate 6, and also facilitate the connection with the inner wall of the cavity 21, which helps to increase the connection area and improve the reliability of the connection.

[0051] In some possible implementations, the front section 2 of the rear floor longitudinal beam of the above-mentioned feature is adopted as follows Figure 3 and Figure 5 See the structure shown. Figure 3 and Figure 5 A vertically penetrating positioning hole 23 is provided on the front section 2 of the rear floor longitudinal beam. A plurality of positioning holes 23 are provided at intervals along the front-to-rear direction. The positioning holes 23 are respectively provided close to one side of the door sill beam body 1.

[0052] In this embodiment, when quasi-assembling the vehicle, the positioning holes 23 of the front section 2 of the rear floor longitudinal beam are used to cooperate with the positioning columns on the tooling to achieve accurate positioning of the rear door sill structure. At least two positioning holes 23 are provided and arranged according to actual position requirements.

[0053] Specifically, the positioning hole 23 is arranged on a side close to the threshold beam body 1, and can be conveniently arranged by utilizing the space provided by the lower concave cavity, thereby fully meeting the spatial arrangement requirements of the structure.

[0054] In some possible implementations, the front inner plate 3 of the rear floor longitudinal beam of the above-mentioned feature is adopted as follows Figure 2 and Figure 6 See the structure shown. Figure 2 and Figure 6 The front end of the inner plate 3 of the front section of the rear floor longitudinal beam is provided with a reinforcing ear 31 bent toward the center axis side of the vehicle body, and the front section 2 of the rear floor longitudinal beam is provided with a matching portion 24 that is closely connected to the reinforcing ear 31.

[0055] In this embodiment, the side edges of the front section 2 of the rear floor longitudinal beam adjacent to the front section inner plate 3 of the rear floor longitudinal beam are bent upward to form a plate surface that can fit with the side wall of the front section inner plate 3 of the rear floor longitudinal beam, which helps to increase the connection surface 22 area between the two and ensure the reliability of the connection.

[0056] On this basis, the reinforcing ear 31 provided on the inner plate 3 of the front section of the rear floor longitudinal beam can cooperate with the matching portion 24 of the front section of the rear floor longitudinal beam 2, and the matching portion 24 is located at the rear side of the reinforcing ear 31. Through the contact and cooperation between the two, the two can achieve the limiting effect in the front and rear direction of the vehicle body, and improve the convenience of positioning between the two. At the same time, the arrangement of the above structure also effectively improves the structural strength, enhances the performance of the structure in resisting side collision, and thus improves the safety of the whole vehicle.

[0057] Based on the same inventive concept, the embodiment of the present application further provides a vehicle, which includes a rear sill structure. The vehicle provides a space for installing the front section 2 of the rear floor longitudinal beam by setting an inner concave cavity 11 on the sill beam body 1. The setting of the inner concave cavity 11 can form a step structure on the sill beam body 1, which not only helps to enhance the strength of the sill beam body 1 and facilitates the positioning and connection with the front section 2 of the rear floor longitudinal beam, but also helps to expand the internal space of the cavity 21, facilitates the structural layout, and improves the overall safety of the vehicle.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The rear door sill structure is characterized by: The invention comprises a sill beam body (1), a front section of a rear floor longitudinal beam (2) and an inner plate (3) of the front section of the rear floor longitudinal beam, wherein the sill beam body (1) is connected to the outer side of the front section of the rear floor longitudinal beam (2), the inner plate (3) of the front section of the rear floor longitudinal beam is connected to the inner side of the front section of the rear floor longitudinal beam (2), and the sill beam body (1), the front section of the rear floor longitudinal beam (2) and the inner plate (3) of the front section of the rear floor longitudinal beam enclose a cavity (21) opening upward; Wherein, an inner concave cavity (11) is provided on the inner side of the door sill beam body (1), and the bottom wall of the inner concave cavity (11) is connected to the front section (2) of the rear floor longitudinal beam.

2. The rear door sill structure according to claim 1, characterized in that: The inner concave cavity (11) extends in the front-to-rear direction and is arranged to penetrate downward through the bottom wall of the door sill beam body (1); the rear portion of the front section (2) of the rear floor longitudinal beam is connected to the inner concave cavity (11).

3. The rear door sill structure according to claim 2, characterized in that: A guide surface (12) is provided at the front end of the inner concave cavity (11), and the guide surface (12) gradually extends from the rear to the front and is inclined toward the center axis of the vehicle body. A connecting surface (22) connected to the guide surface (12) is provided on the front section (2) of the rear floor longitudinal beam.

4. The rear door sill structure according to claim 3, characterized in that: The front section of the rear floor longitudinal beam (2) also has a limiting portion (25), the limiting portion (25) extending forward to protrude from the threshold beam body (1), the limiting portion (25) being bent toward the outside of the vehicle body and in contact with the rear edge of the threshold beam body (1), the limiting portion (25) being used to limit the position of the threshold beam body (1) in the front-rear direction.

5. The rear sill structure according to claim 1, characterized in that: A reinforcing plate (4) extending in the left-right direction of the vehicle body is provided in the cavity (21), and two side edges of the reinforcing plate (4) are respectively connected to the sill beam body (1) and the front inner plate (3) of the rear floor longitudinal beam.

6. The rear sill structure according to claim 5, characterized in that: The outer periphery of the reinforcing plate (4) is provided with a bent portion (41) bent backwards, the bottom surface of the bent portion (41) is connected to the top surface of the front section (2) of the rear floor longitudinal beam, and the opposite side walls of the bent portion (41) are respectively connected to the sill beam body (1) and the inner plate (3) of the front section of the rear floor longitudinal beam.

7. The rear door sill structure according to claim 5, characterized in that: The rear sill structure also includes a rear suspension longitudinal arm mounting frame (5), the rear suspension longitudinal arm mounting frame (5) is located on the rear side of the reinforcing plate (4), the two side edges of the rear suspension longitudinal arm mounting frame (5) are respectively connected to the sill beam body (1) and the front section inner plate (3) of the rear floor longitudinal beam in a one-to-one correspondence, and the front side of the rear suspension longitudinal arm mounting frame (5) is connected to an auxiliary support plate (6).

8. The rear door sill structure according to any one of claims 1 to 7, characterized in that: The front section (2) of the rear floor longitudinal beam is provided with a positioning hole (23) which passes through from top to bottom. A plurality of positioning holes (23) are arranged at intervals along the front-to-back direction. The positioning holes (23) are respectively arranged close to one side of the door sill beam body (1).

9. The rear door sill structure according to any one of claims 1 to 7, characterized in that: The front end of the inner plate (3) of the front section of the rear floor longitudinal beam is provided with a reinforcing ear (31) bent toward the center axis of the vehicle body, and the front section (2) of the rear floor longitudinal beam is provided with a matching portion (24) that is closely connected to the reinforcing ear (31).

10. A vehicle, characterized in that: The vehicle comprises the rear rocker structure according to any one of claims 1-9.

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