CN211167095U - Vehicle beam assembly and frame - Google Patents

Abstract

The utility model discloses a vehicle beam assembly and a vehicle frame, comprising a lower beam and a lower connecting plate, wherein the lower beam is provided with a cavity, and the lower connecting plate comprises a first part and a second part which are integrally formed. The outer contour of the second part is fixedly connected with the edge of the opening of the cavity to close the cavity. The cavity structure of the vehicle cross beam assembly of the utility model can improve the integrity, strength and rigidity of the vehicle cross beam assembly structure, improve the collision performance and bending torsional rigidity of the vehicle cross beam assembly, improve the comfort and reduce the injury to the occupants. To protect the occupant's living space; compared with the method of increasing the strength and rigidity of the vehicle cross member assembly in the prior art, the cavity structure of the vehicle cross member assembly of the present application can enhance the strength and rigidity of the vehicle cross member assembly. On the basis, the weight of the vehicle beam assembly is reduced, and the lightweight design of the vehicle beam assembly is realized.

Description

Vehicle beam assembly and frame

technical field

The utility model relates to the technical field of automobiles, in particular to a vehicle beam assembly and a vehicle frame having the vehicle beam assembly.

Background technique

Frontal collision of vehicles is one of the main forms of current traffic accidents, and the occupant injury rate is relatively high in traffic accidents. In the prior art, the frontal collision performance of the automobile is regarded as one of the evaluation indexes of the automobile safety performance. In the process of frontal collision, whether the rigidity and strength of the cowl beam can effectively overcome the impact force of the frontal collision is an important aspect to measure the stability of the front structure of the vehicle.

In the prior art, a front wall vehicle cross member assembly is provided, which includes a front wall cross member body and a mass support beam connected to both ends of the front wall cross member body. The front wall cross member body and the support beam form a "π" shape, which can It is closely connected with the dash panel and has the effect of stress dispersion, but the disclosed dash cross member body is a plate-like structure. When the front part of the vehicle receives a collision, the strength and rigidity of the vehicle beam assembly at the dash root are insufficient. , it is necessary to add another reinforcing plate structure, resulting in more parts of the front wall vehicle beam assembly, and the mechanical connection between the parts also reduces the overall continuity of the front wall vehicle beam assembly, so that it still cannot meet the front wall vehicle beam assembly. strength and stiffness requirements of the part.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the prior art, and to provide a vehicle beam assembly, which can solve the problems of low strength and rigidity of the vehicle beam assembly in the prior art; another purpose of the present utility model is to provide a vehicle beam assembly. A frame with the vehicle cross member assembly.

In order to achieve the above purpose, the present invention provides a vehicle cross member assembly, which includes a lower cross member and a lower connecting plate, the lower cross member is provided with a cavity, and the lower connecting plate includes a first part and a second part which are integrally formed, so The outer contour of the second part is fixedly connected with the edge of the opening of the cavity to close the cavity.

As a preferred solution, the lower beam includes a middle portion, a first end portion and a second end portion located at both ends of the middle portion, and the cavity includes a first cavity provided on the first end, and a cavity provided on the The second cavity at the second end and the third cavity provided in the middle portion, the first cavity, the second cavity and the third cavity communicate with each other.

As a preferred solution, the first end portion and the second end portion have the same structure and are oppositely arranged;

The two sides of the first cavity in the width direction of the lower beam are a first side plate and a second side plate respectively, and the height of the first side plate extending toward the opening of the first cavity is smaller than the height of the first side plate. The height of the second side plate extending toward the opening direction of the first cavity;

The two sides of the second cavity in the width direction of the lower beam are respectively a third side plate and a fourth side plate, and the height of the third side plate extending toward the opening direction of the second cavity is smaller than the height of the third side plate. The height of the fourth side plate extending toward the opening direction of the second cavity.

As a preferred solution, the middle part includes a fifth side plate integrally formed with the second side plate and the fourth side plate, and a first bottom plate connected with the fifth side plate, the first bottom plate is connected to the The height of the first side plate is the same, and the first bottom plate and the fifth side plate form the third cavity.

As a preferred solution, the first cavity, the second cavity and the third cavity are respectively provided with first reinforcement structures extending in the vertical direction of the vehicle.

As a preferred solution, the first reinforcement structure includes a first reinforcement longitudinal plate, a first reinforcement transverse plate and a first reinforcement column, the first reinforcement longitudinal plate and the first reinforcement transverse plate are cross-fixed, and the first reinforcement The reinforcement column is arranged at the intersection of the first reinforcement longitudinal plate and the first reinforcement transverse plate.

As a preferred solution, the middle portion, the first end portion, the second end portion and the first reinforcing structure are integrally formed.

As a preferred solution, both ends of the lower beam are fixedly connected with a left longitudinal beam rear plate and a right longitudinal beam rear plate respectively.

As a preferred solution, the left longitudinal beam rear plate and the right longitudinal beam rear plate are disposed opposite to each other;

The left longitudinal beam rear plate includes a left longitudinal beam bottom plate and a plurality of left longitudinal beam connecting plates fixedly arranged on the left longitudinal beam bottom plate, and the left longitudinal beam bottom plate is fixedly connected with the first end; The plate includes a right longitudinal beam bottom plate and a plurality of right longitudinal beam connecting plates fixed on the right longitudinal beam bottom plate, and the right longitudinal beam bottom plate is fixedly connected with the second end portion.

As a preferred solution, a second reinforcement structure is further provided on the bottom plate of the left longitudinal beam, and the second reinforcement structure includes a second reinforcement longitudinal plate, a second reinforcement transverse plate and a second reinforcement column, and the second reinforcement longitudinal plate and the second reinforcing horizontal plate is cross-fixed, and the second reinforcing column is arranged at the intersection of the second reinforcing vertical plate and the second reinforcing horizontal plate;

The bottom plate of the right longitudinal beam is also provided with a third reinforcement structure, and the third reinforcement structure includes a third reinforcement longitudinal plate, a third reinforcement transverse plate and a third reinforcement column. The three reinforcing horizontal plates are cross-fixed, and the third reinforcing column is arranged at the intersection of the third reinforcing vertical plate and the third reinforcing horizontal plate;

The left longitudinal beam bottom plate, the left longitudinal beam connecting plate and the second reinforcement structure are integrally formed;

The right longitudinal beam bottom plate, the right longitudinal beam connecting plate and the third reinforcement structure are integrally formed.

A vehicle frame, comprising a vehicle cross member assembly and a middle channel, the vehicle cross member assembly being the above vehicle cross member assembly, the vehicle cross member assembly comprising a middle portion, the lower connecting plate comprising a second portion, the middle portion The upper and lower parts are fixedly connected with the second part to form a third cavity with an opening, and the middle channel is fixedly connected at the opening of the third cavity.

Compared with the prior art, the beneficial effects of the present utility model are:

The lower beam of the vehicle beam assembly of the utility model is provided with a cavity, and the second part of the lower connecting plate is fixedly and matched with the opening of the cavity, so that the vehicle beam assembly forms an integral closed cavity structure. The length direction forms an overall coherent force-bearing structure, which improves the overall strength and rigidity of the vehicle beam assembly structure; the cavity structure can transmit and absorb part of the collision force, improve the collision performance and bending and torsional stiffness of the vehicle beam assembly, and improve the NVH performance, while improving comfort, reducing injury to occupants, and protecting occupant living space; compared with the method of increasing the strength and rigidity of the vehicle cross member assembly in the prior art by adding a reinforcing plate structure, the cavity of the vehicle cross member assembly of the present application is The body structure can reduce the weight of the vehicle beam assembly on the basis of enhancing the strength and rigidity of the vehicle beam assembly, and realize the lightweight design of the vehicle beam assembly.

Description of drawings

1 is a schematic structural diagram of a vehicle cross member assembly in an embodiment of the present utility model;

2 is a cross-sectional view of the connection structure of the middle portion of the vehicle cross member assembly, the lower connecting plate and the middle channel in the embodiment of the present utility model;

3 is a cross-sectional view of the connection structure between the first end of the vehicle cross member assembly and the lower connecting plate in the embodiment of the present utility model;

4 is a schematic structural diagram of a lower beam of a vehicle beam assembly in an embodiment of the present utility model;

5 is a schematic structural diagram of a lower connecting plate of a vehicle cross member assembly in an embodiment of the present utility model;

6 is a schematic structural diagram of a right longitudinal beam rear panel of a vehicle cross beam assembly in an embodiment of the present invention;

7 is a schematic structural diagram of a left longitudinal beam rear panel of a vehicle cross beam assembly in an embodiment of the present invention.

In the figure, 1, lower beam; 11, cavity; 110, first cavity; 111, second cavity; 112, third cavity; 114, first side plate; 115, second side plate; 116, The third side plate; 117, the fourth side plate; 12, the middle part; 121, the fifth side plate; 122, the first bottom plate; 13, the first end part; 14, the second end part; 2, the lower connecting plate; 21. The first part; 22. The second part; 3. Left longitudinal beam rear plate; 31. Left longitudinal beam bottom plate; 32. Left longitudinal beam connecting plate; 4. Right longitudinal beam rear plate; 41. Right longitudinal beam bottom plate; 42 , right longitudinal beam connecting plate; 5, middle channel; 6, first reinforcement structure; 61, first reinforcement longitudinal plate; 62, first reinforcement transverse plate; 63, first reinforcement column; 7, second reinforcement structure; 8 , The third strengthening structure.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on those shown in the accompanying drawings. The orientation or positional relationship is 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a reference to the present utility model. limits. It should be understood that the terms "first", "second", etc. are used to describe various information in the present invention, but the information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information without departing from the scope of the present invention.

The preferred embodiment of the vehicle cross member assembly of the present invention, as shown in FIGS. 1-6 , the vehicle cross member assembly of the present invention includes a lower cross member 1, a lower connecting plate 2, a left longitudinal beam rear plate 3 and a right longitudinal beam rear plate. Plate 4, wherein the lower cross member 1 is provided with a cavity 11 extending downward, the upper part of the cavity 11 has an opening, and the lower connecting plate 2 includes a first part 21 and a second part 22 which are integrally formed, and the first part 21 is used for connecting the vehicle body , the contour of the second part 22 matches the shape of the edge of the opening of the cavity 11, so that the second part 22 is fixedly connected up and down with the opening of the cavity 11 to close the cavity so that the cavity forms a "mouth"-shaped cavity in cross section, The integrity of the lower cross member 1 and the lower connecting plate 2 is improved, and on the basis of improving the strength and rigidity of the vehicle cross member assembly, the collision force received by the vehicle cross member assembly is sequentially formed along the lower cross member 1 and the lower connecting plate 2. The circulating flow and attenuation on the side wall of the cavity 11 can effectively absorb and disperse the collision energy.

4 , the lower beam 1 includes a middle portion 12 and a first end portion 13 and a second end portion 14 located at both ends of the middle portion 12 , wherein the cavity 11 includes a first cavity provided at the first end portion 13 . The body 110 , the second cavity 111 provided at the second end portion 14 and the third cavity 112 provided at the middle portion 12 , the first cavity 110 , the second cavity 111 and the third cavity 112 are communicated with each other. Compared with the shape of the plate surface, the three-dimensional cavity 11 structure can improve the strength and rigidity of the lower beam 1. When the lower cross member 1 is subjected to a lateral impact force, the first end portion 13 and the second end portion 14 are the main force-bearing parts, and the middle portion 12 needs to be connected with the middle passage of the vehicle body. The first cavity 110 and the The shape of the second cavity 111 is larger than the shape of the third cavity 112 . In this application, in order to make the structure and force of the lower beam 1 symmetrical, the first end portion 13 and the second end portion 14 in the embodiment of the present invention have the same shape and are symmetrically arranged with the middle portion as the center; specifically, The two opposite sides of the first cavity 110 in the width direction of the lower beam 1 are the first side plate 114 and the second side plate 115 respectively, and the height of the first side plate 114 extending toward the opening direction of the first cavity 110 is less than The height of the second side plate 115 extending toward the opening of the first cavity 110 , that is, the height of the first side plate 114 is smaller than the height of the second side plate 115 , when the lower connecting plate 2 is fixedly connected to the first end 13 , The cross-sectional shape of the first cavity 110 is a trapezoid as shown in FIG. 3 ; the two sides of the second cavity 111 in the width direction of the lower beam 1 are the third side plate 116 and the fourth side plate 117 , respectively. The third side plate The height of the 116 extending toward the opening of the second cavity 111 is smaller than the height of the fourth side plate 117 extending toward the opening of the second cavity 111 , that is, the height of the third side plate 116 is smaller than the height of the fourth side plate 117 . When the connecting plate 2 is fixedly connected to the second end portion 14 , the cross-sectional shape of the second cavity 111 is also a trapezoid.

Referring to FIG. 2 , the middle portion 12 of the lower cross member 1 includes a fifth side plate 121 , the fifth side plate 121 is located in the middle of the second side plate 115 and the fourth side plate 117 , and the fifth side plate 121 is connected to the second side plate 121 . The plate 115 and the fourth side plate 117 are integrally formed, and the height of the fifth side plate 121 is equal to the height of the second side plate 115; the bottom of the middle portion 12 is connected with a first bottom plate 122, the first bottom plate 122 and the fifth side plate 121 It is integrally formed and fixedly connected, and the height of the first bottom plate 122 is flush with the first side plate 114 , the fifth side plate 121 and the first bottom plate 122 form a third cavity, so that the cross section of the third cavity 112 of the middle part 12 is The shape is a triangle, the lower connecting plate 2 is fixed with the fifth side plate 121 , the third cavity 112 has an opening, and the opening is used for connecting the middle channel 5 .

In other embodiments of the present application, the structures of the first end portion 13 and the second end portion 14 may be different, and the cross-sectional shapes of the first cavity 110 and the second cavity 111 may be a rectangle, a positive direction, a triangle, etc. Structure; the cross-sectional shape of the third cavity 112 can also be adjusted to a structure such as a square or a trapezoid according to usage requirements.

In order to further increase the strength and rigidity of the lower cross member 1 , a first reinforcement structure 6 is fixed in the cavity 11 . Referring to FIG. 4 , the first reinforcement structure 6 extends along the vertical direction of the cavity of the vehicle. At the same time, the bottom of the cavity 11 is also provided with a bottom reinforcement layer, which is integrally formed with the bottom of the cavity to increase the strength and rigidity of the lower beam 1 . The first reinforcing structure 6 specifically includes a first reinforcing vertical plate 61, a first reinforcing horizontal plate 62 and a first reinforcing column 63. The first reinforcing vertical plate 61 and the first reinforcing horizontal plate 62 are cross-fixed, and the first reinforcing column 63 is provided at the At the intersection of the first reinforcing vertical plate 61 and the first reinforcing transverse plate 62, the middle of the first reinforcing column 63 is provided with a hole extending in the axial direction, which can reduce the weight of the first reinforcing structure 6, and can also be used as a Mounting holes where structural parts are attached. Referring to FIG. 4 , the arrangement directions of the first reinforcement structures 6 in the first cavity 110 , the second cavity 111 and the third cavity 112 are different, and the first reinforcement structures in the first cavity 110 and the third cavity 112 The plate 62 and the first reinforcing vertical plate 61 are fixed at right angles, the first reinforcing horizontal plate 62 and the first reinforcing vertical plate 61 in the second cavity 111 are arranged in a triangular cross, and the first reinforcing structure 6 and the first end 13 , the second end portion 14 and the middle portion 12 are integrally formed, so that the strength and rigidity of the lower beam 1 can be increased. Compared with the lower beam 1 formed by welding and riveting of multiple parts in the prior art, the lower beam in the present application 1's one-piece molding, the overall strength and rigidity are high.

Wherein, the edge of the lower beam 1 is also provided with a flange, and the flange is used to connect the lower connecting plate 2 .

1 , 6 and 7 , the left longitudinal beam rear plate 3 and the right longitudinal beam rear plate 4 are respectively fixedly connected to both ends of the lower cross beam 1 , and the left longitudinal beam rear plate 3 is fixedly connected to the first end portion 13 , The right longitudinal beam rear plate 4 is fixedly connected to the second end portion 14, and the middle portion 12 is fixedly connected to the middle channel 5; in this embodiment, the left longitudinal beam rear plate 3 and the right longitudinal beam rear plate 4 are arranged opposite to facilitate the vehicle cross beam Transmission of assembly force. Specifically, the left longitudinal beam rear plate 3 includes a left longitudinal beam bottom plate 31 and a plurality of left longitudinal beam connecting plates 32 fixedly arranged on the left longitudinal beam bottom plate 31. The left longitudinal beam bottom plate 31 is fixedly connected to the first end portion 13, and the left longitudinal beam bottom plate 31 is One side of the longitudinal beam bottom plate 31 is fixedly connected to the side of the first end 13 at the lateral end of the lower cross beam 1; The upper right longitudinal beam connecting plate 42 and the right longitudinal beam bottom plate 41 are fixedly connected to the second end portion 14 , and one side of the right longitudinal beam bottom plate 41 is fixedly connected to the side of the second end portion 14 located at the lateral end of the lower cross beam 1 .

As shown in FIGS. 6 and 7 , similar to the first reinforcement structure 6 in the lower cross member 1 , a second reinforcement structure 7 is also provided on the bottom plate 31 of the left longitudinal beam. The second reinforcement structure 7 includes a second reinforcement longitudinal plate, The second reinforcement transverse plate and the second reinforcement column, the second reinforcement longitudinal plate and the second reinforcement transverse plate are crossed and fixed, and the second reinforcement column is arranged at the intersection of the second reinforcement longitudinal plate and the second reinforcement transverse plate; the bottom plate of the right longitudinal beam 41 is also provided with a third reinforcement structure 8, the third reinforcement structure includes a third reinforcement longitudinal plate, a third reinforcement transverse plate and a third reinforcement column, the third reinforcement longitudinal plate and the third reinforcement transverse plate are cross-fixed, and the third reinforcement longitudinal plate and the third reinforcement transverse plate are cross-fixed. The three reinforcement columns are arranged at the intersection of the third reinforcement longitudinal plate and the third reinforcement transverse plate, and the left longitudinal beam bottom plate 31, the left longitudinal beam connecting plate 32 and the second reinforcement structure 7 are integrally formed, and the right longitudinal beam bottom plate 41, The right side member connecting plate 42 and the third reinforcing structure 8 are integrally formed. In this way, the left longitudinal beam rear panel 3 and the right longitudinal beam rear panel 4 are both integrally formed, so that the strength of the left longitudinal beam rear panel 3 and the right longitudinal beam rear panel 4 can be increased.

Wherein, the lower beam 1, the lower connecting plate 2, the left longitudinal beam rear plate 3 and the right longitudinal beam rear plate 4 in the present application are all integrally formed structures. Specifically, the lower beam 1 and the left longitudinal beam rear plate of the present application 3 and the right longitudinal beam rear plate 4 are cast aluminum parts, and the lower connecting plate 2 is a stamped aluminum part. During installation, only the lower connecting plate 2, the left longitudinal beam rear plate 3 and the right longitudinal beam rear plate 4 are fixed by riveting. On the lower beam 1, the structure is simple and the structural parts are few. The main force-bearing components, the lower beam 1 and the lower connecting plate 2, are integrated in the lateral direction, which improves the rigidity and strength of the vehicle beam assembly and reduces the collision deformation of the vehicle beam assembly. , and compared with the selection of steel materials in the prior art, the weight of the vehicle beam assembly can be significantly reduced, and a lightweight design can be achieved.

In the present application, the above-mentioned fixed connection may adopt fastening methods such as riveting, welding, and bolting, and riveting is preferred in this application.

A preferred embodiment of a vehicle frame of the present application, as shown in FIGS. 1 and 2 , includes a vehicle cross member assembly and a middle channel 5 , and the structure of the vehicle cross member assembly is the same as that in the above-mentioned vehicle cross member assembly embodiment. , the vehicle cross member assembly includes a middle part 12, the lower connecting plate 2 includes a second part 22, the middle part 12 and the second part 22 are fixedly connected up and down to form a third cavity 112 with an opening, and the middle channel 5 is fixedly connected in the third cavity the opening of the body.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and replacements can be made. These improvements And replacement should also be regarded as the protection scope of the present invention.

Claims (10)

1. The vehicle beam assembly is characterized by comprising a lower beam and a lower connecting plate, wherein the lower beam is provided with a cavity, the lower connecting plate comprises a first part and a second part which are integrally formed, and the outer contour of the second part is fixedly connected with the edge of an opening of the cavity to close the cavity.

2. The vehicle cross-member assembly of claim 1, wherein the lower cross-member includes a middle portion and first and second end portions at opposite ends of the middle portion, the cavities including a first cavity at the first end portion, a second cavity at the second end portion, and a third cavity at the middle portion, the first, second, and third cavities being in communication with one another.

3. The vehicle cross-member assembly of claim 2, wherein the first and second end portions are identical in construction and are oppositely disposed;

two side edges of the first cavity in the width direction of the lower cross beam are respectively a first side plate and a second side plate, and the height of the first side plate extending towards the opening direction of the first cavity is smaller than the height of the second side plate extending towards the opening direction of the first cavity;

the two side edges of the second cavity in the width direction of the lower cross beam are respectively a third side plate and a fourth side plate, and the height of the third side plate extending towards the opening direction of the second cavity is smaller than the height of the fourth side plate extending towards the opening direction of the second cavity.

4. The vehicle cross member assembly of claim 3 wherein the intermediate portion includes a fifth side panel integrally formed with the second and fourth side panels, and a first bottom panel connected to the fifth side panel, the first bottom panel being level with the first side panel in height, the first bottom panel and the fifth side panel forming the third cavity.

5. The vehicle cross-member assembly of claim 4, wherein a first reinforcing structure extending in a vehicle up-down direction is provided in each of the first, second, and third cavities.

6. The vehicle cross-member assembly according to claim 5, wherein the first reinforcement structure includes a first reinforcement side plate, a first reinforcement cross plate, and a first reinforcement pillar, the first reinforcement side plate and the first reinforcement cross plate being fixed in a crossed manner, the first reinforcement pillar being provided at a crossing of the first reinforcement side plate and the first reinforcement cross plate.

7. The vehicle cross-member assembly of claim 5, wherein the intermediate portion, the first end portion, the second end portion, and the first reinforcement structure are integrally formed.

8. The vehicle cross member assembly of claim 1, wherein a left side member rear plate and a right side member rear plate are fixedly connected to both ends of the lower cross member, respectively, and the left side member rear plate and the right side member rear plate are disposed opposite to each other;

the left longitudinal beam rear plate comprises a left longitudinal beam bottom plate and a plurality of left longitudinal beam connecting plates fixedly arranged on the left longitudinal beam bottom plate, and the left longitudinal beam bottom plate is fixedly connected with the first end part; the right longitudinal beam rear plate comprises a right longitudinal beam bottom plate and a plurality of right longitudinal beam connecting plates fixed on the right longitudinal beam bottom plate, and the right longitudinal beam bottom plate is fixedly connected with the second end portion.

9. The vehicle cross-member assembly of claim 8,

the left longitudinal beam bottom plate is also provided with a second reinforcing structure, the second reinforcing structure comprises a second reinforcing longitudinal plate, a second reinforcing transverse plate and a second reinforcing column, the second reinforcing longitudinal plate and the second reinforcing transverse plate are fixed in a crossed mode, and the second reinforcing column is arranged at the crossed position of the second reinforcing longitudinal plate and the second reinforcing transverse plate;

a third reinforcing structure is further arranged on the right longitudinal beam bottom plate and comprises a third longitudinal reinforcing plate, a third transverse reinforcing plate and a third reinforcing column, the third longitudinal reinforcing plate and the third transverse reinforcing plate are fixed in a crossed mode, and the third reinforcing column is arranged at the crossed position of the third longitudinal reinforcing plate and the third transverse reinforcing plate;

the left longitudinal beam bottom plate, the left longitudinal beam connecting plate and the second reinforcing structure are integrally formed;

the right longitudinal beam bottom plate, the right longitudinal beam connecting plate and the third reinforcing structure are integrally formed.

10. A vehicle frame, comprising a vehicle cross member assembly and a center tunnel, wherein the vehicle cross member assembly is the vehicle cross member assembly of claims 1-9, the vehicle cross member assembly comprises a middle portion, the lower connecting plate comprises a second portion, the middle portion and the second portion are fixedly connected up and down to form a third cavity with an opening, and the center tunnel is fixedly connected to the opening of the third cavity.

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