CN218505995U

CN218505995U - Crossbeam assembly of automobile body C ring, automobile body C ring structure assembly and vehicle

Info

Publication number: CN218505995U
Application number: CN202223079145.4U
Authority: CN
Inventors: 赵静
Original assignee: Xiaomi Automobile Technology Co Ltd
Current assignee: Xiaomi Automobile Technology Co Ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-02-21
Anticipated expiration: 2032-11-18

Abstract

The utility model relates to a beam assembly of a C-ring of a vehicle body, a C-ring structure assembly of the vehicle body and a vehicle, wherein the beam assembly of the C-ring of the vehicle body comprises an object placing plate and a beam body; the transverse beam body extends along the left and right direction of the vehicle, the object placing plate is covered on the transverse beam body, the object placing plate and the transverse beam body jointly enclose at least two cavities which are distributed along the front and back direction of the vehicle, and the cross section of each cavity is a closed cross section. This crossbeam assembly of automobile body C ring has increased the cavity quantity and the area of cross-section, can effectual promotion automobile body C ring structural torsional rigidity, can not invade and occupy the suitcase space yet, can not influence the use in suitcase space.

Description

Crossbeam assembly of automobile body C ring, automobile body C ring structure assembly and vehicle

Technical Field

The disclosure relates to the technical field of vehicle manufacturing, in particular to a beam assembly of a vehicle body C ring, a vehicle body C ring structure assembly and a vehicle.

Background

Due to the arrangement of the battery pack, the electric new energy automobile has higher requirement on the torsional rigidity of an automobile body compared with a common fuel vehicle, and the C-ring frame structure of the automobile body is a main means for improving the torsional rigidity of the automobile body.

In the related art, the torsional rigidity of the vehicle body is improved by increasing the area of the closed cross section of the cross beam assembly in the vertical direction of the vehicle, but the improvement of the torsional rigidity of the vehicle body is limited due to the limiting effect of the trunk space, and meanwhile, the trunk space is reduced.

SUMMERY OF THE UTILITY MODEL

The purpose of the present disclosure is to provide a cross beam assembly of a vehicle body C-ring, a vehicle body C-ring structure assembly and a vehicle, so as to solve the problem in the related art that the improvement of the torsional rigidity of the vehicle body is limited.

In order to achieve the above object, a first aspect of the present disclosure provides a cross member assembly of a C-ring of a vehicle body, including a shelf and a cross member body;

the transverse beam body extends along the left and right direction of the vehicle, the object placing plate is covered on the transverse beam body, the object placing plate and the transverse beam body jointly enclose at least two cavities which are distributed along the front and back direction of the vehicle, and the cross section of each cavity is a closed cross section.

Optionally, at least two concave portions arranged along the front-rear direction of the vehicle are formed on the cross beam body, the concave portions are recessed towards the direction away from the object placing plate, and the at least two concave portions and the object placing plate jointly enclose at least two cavities.

Optionally, at least two convex portions arranged in the front-rear direction of the vehicle are formed on the object placing plate, the convex portions protrude in a direction away from the beam body, the convex portions correspond to the concave portions one to one, and each convex portion and the corresponding concave portion jointly enclose the cavity.

Optionally, a convex surface is arranged between two adjacent concave parts, a concave surface is arranged between two adjacent convex parts, and the convex surface is connected with the corresponding concave surface.

Optionally, the front end of the convex portion located at the front portion of the storage plate has a first flange extending obliquely downward, the front end of the concave portion located at the front portion of the cross beam body has a second flange extending obliquely downward, and the first flange is overlapped with the second flange.

Optionally, the object placing plate comprises a front plate body and a rear plate body formed at the rear end of the front plate body, the convex portion is located on the front plate body, the beam body is located below the front plate body, a third flanging is arranged at the rear end of the concave portion at the rear portion of the beam body, and the third flanging is in lap joint with the bottom surface of the rear plate body.

Optionally, the area of the cross section of the cavity increases in the front-to-back direction.

Optionally, a first positioning portion is formed on the object placing plate, and a second positioning portion matched with the first positioning portion is formed on the beam body.

Optionally, the first positioning portion is a groove formed in the front of the shelf, and the second positioning portion is a protrusion formed in the front of the cross beam body; alternatively, the first and second liquid crystal display panels may be,

the first positioning part is a bulge formed at the front part of the object placing plate, and the second positioning part is a groove formed at the front part of the cross beam body.

Optionally, the number of the first positioning portions and the number of the second positioning portions are multiple and are arranged in a one-to-one correspondence manner, and the multiple first positioning portions and the multiple second positioning portions are arranged at intervals in the left-right direction of the vehicle.

Optionally, the object placing plate includes a front plate body and a rear plate body formed at the rear end of the front plate body, the cross beam body is located below the front plate body and surrounds at least two cavities together with the front plate body, the size of the front plate body in the front-rear direction of the vehicle is 200mm to 300mm, the size of the rear plate body in the front-rear direction of the vehicle is 500mm to 600mm, and the size of the cross beam body in the front-rear direction of the vehicle is 200mm to 300mm.

Optionally, the number of the cavities is two, and one of the two cavities has a size of 80mm to 120mm in the front-rear direction of the vehicle and a size of 40mm to 60mm in the up-down direction of the vehicle;

the other of the two cavities has a dimension of 60mm to 80mm in the front-rear direction of the vehicle and a dimension of 20mm to 30mm in the up-down direction of the vehicle.

Optionally, the beam assembly further includes two connecting brackets oppositely disposed in the left-right direction of the vehicle, the two connecting brackets are respectively connected to two ends of the beam body in the left-right direction of the vehicle, and the connecting brackets are used for being connected with the wheel casing.

The second aspect of the present disclosure further provides a vehicle body C-ring structure assembly, which includes two wheel covers oppositely arranged in the left-right direction of the vehicle, a bottom beam, and the beam assembly of the vehicle body C-ring;

the two ends of the cross beam assembly in the left-right direction of the vehicle are respectively connected with the upper parts of the two wheel covers, and the lower parts of the two wheel covers are respectively connected with the two ends of the bottom beam in the left-right direction of the vehicle, so that the two wheel covers, the bottom beam and the cross beam assembly jointly form a ring frame structure.

The third aspect of the present disclosure also provides a vehicle, which includes the above-mentioned vehicle body C-ring structure assembly.

Above-mentioned technical scheme is through putting thing board lid on the crossbeam body to form two at least cavities, thereby formed two at least closed cross section's structure, increased closed cross section's quantity and area in the fore-and-aft direction of vehicle, can not receive the restriction in the ascending suitcase space of upper and lower side of vehicle, thereby the torsional rigidity of promotion automobile body C ring structure that can be great can not invade and account for the suitcase space yet, can not influence the use in suitcase space. The beam assembly of the C-shaped ring of the vehicle body increases the number and the area of the closed sections, and can effectively improve the torsional rigidity of the C-shaped ring of the vehicle body.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure, but do not constitute a limitation of the disclosure. In the drawings:

FIG. 1 is a perspective view of one perspective of a cross-member assembly of a C-ring of a vehicle body according to one embodiment of the present disclosure;

FIG. 2 is a bottom view of a cross-member assembly of a vehicle body C-ring of one embodiment of the present disclosure;

FIG. 3 is a perspective view of another perspective of a cross-member assembly of a C-ring of a vehicle body according to one embodiment of the present disclosure;

FIG. 4 is an enlarged fragmentary view taken at location A of the cross-member assembly of the C-ring of the vehicle body of one embodiment of the present disclosure;

FIG. 5 is a cross-sectional structural schematic view of a cross-member assembly of a C-ring of a vehicle body according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural view of a beam body of one embodiment of the present disclosure;

FIG. 7 is a schematic structural view of a vehicle body C-ring structure assembly according to an embodiment of the disclosure.

Description of the reference numerals

1. The storage plate comprises a storage plate body 11, a front plate body 12, a rear plate body 13, a convex part 14, a first positioning part 15, a concave surface 16 and a first flanging;

2. the cross beam comprises a cross beam body 21, a concave part 22, a second positioning part 23, a convex surface 24, a second flanging 25 and a third flanging;

3. connecting a bracket;

4. a bottom beam;

5. a wheel cover;

6. a cavity.

Detailed Description

The following detailed description of the embodiments of the disclosure refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the use of directional terms such as "up, down, left, right, front, and rear" is generally used with respect to a state in which the vehicle normally travels, and specifically, when the vehicle normally travels, the direction toward the head of the vehicle is "front", the direction toward the tail of the vehicle is "rear", the direction toward the ceiling is "up", the direction toward the floor is "down", the direction toward the left wheel is "left", and the direction toward the right wheel is "right".

In addition, the "cross member" in the present disclosure means a beam extending in the vehicle left-right direction, and all the "side members" means beams extending in the vehicle front-rear direction. In the present disclosure, "frontal impact" refers to a situation in which the front portion of the vehicle is subjected to an impact, and "side impact" refers to a situation in which the side surface of the vehicle is subjected to an impact. In addition, the terms "dash panel", "floor panel", "rocker inner panel" and the like referred to in the embodiments of the present disclosure are, without other specific explanations, the meanings of which are well known in the art.

Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.

In addition, without specific description or limitation, terms such as "connect", "mount", "connect", "fix", and the like may be broadly interpreted and may be implemented in a non-detachable manner such as welding, a detachable manner such as bolts, or an integrally formed manner such as molding, which are well known to those skilled in the art, and specific meanings of the terms in the present disclosure may be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 6, an aspect of the present disclosure provides a cross member assembly of a C-ring of a vehicle body, including a parcel shelf 1 and a cross member body 2.

The crossbeam body 2 extends along the left and right directions of vehicle, puts 1 lid of thing board and establishes on crossbeam body 2, and puts thing board 1 and crossbeam body 2 and enclose into at least two cavities 6 of arranging along the fore-and-aft direction of vehicle jointly, and the cross-section of cavity 6 is the closed cross-section.

The storage plate 1 is mainly applied to a three-compartment car body structure, is an important component part, is usually positioned on a car body rear floor, can play a role in installing structures such as a trunk hinge and the like, and can play a role in protecting passengers at a rear row and improving the torsional rigidity of the whole car.

Wherein, in this embodiment, put thing board 1 level setting and be located the top of crossbeam body 2, crossbeam body 2 level setting, crossbeam body 2 is used for linking to each other with the ascending part in the left and right sides of vehicle.

Wherein, after the object placing plate 1 is connected with the beam body 2, the whole beam assembly forming the C ring structure of the vehicle body can be formed.

Wherein, it can be a plurality of to put thing board 1 and crossbeam body 2's junction to can form two at least cavities 6, thereby increase the joint strength and the rigidity of crossbeam assembly self, make the torsional rigidity of the automobile body C ring structure of constituteing through the crossbeam assembly obtain promoting.

In addition, the object placing plate 1 and the cross beam body 2 jointly form at least two cavities 6 to form at least two closed cross section structures, so that the number and the area of the closed cross sections are increased in the front-rear direction of a vehicle, and the torsional rigidity of the formed C-ring structure of the vehicle body can be improved.

Among the above-mentioned technical scheme, through putting thing board 1 lid on crossbeam body 2 to form two at least cavities 6, thereby formed two at least closed cross-section's structure, increased closed cross-section's quantity and area in the fore-and-aft direction of vehicle, can not receive the restriction in the ascending suitcase space of upper and lower side of vehicle, thereby promotion automobile body C that can be great constructs the torsional rigidity of ring structure, can not invade and account for the suitcase space yet, can not influence the use in suitcase space. The beam assembly of the C-ring of the vehicle body increases the number and the area of the closed sections, and can effectively improve the torsional rigidity of the C-ring structure of the vehicle body.

Optionally, in another embodiment of the present disclosure, at least two concave portions 21 are formed on the cross beam body 2, and are arranged along the front-rear direction of the vehicle, the concave portions 21 are concave toward a direction away from the object placing plate 1, and the at least two concave portions 21 and the object placing plate 1 jointly enclose at least two cavities 6.

In the present embodiment, the surface of the concave portion 21 facing the object placing plate 1 and the position of the object placing plate 1 facing the concave portion 21 may jointly form the cavity 6, wherein the position of the beam body 2 not recessed to form the concave portion 21 is connected to the bottom surface of the object placing plate 1, so that each concave portion 21 and the object placing plate 1 jointly enclose one cavity 6, and the cross section of the formed cavity 6 is a closed cross section.

The recess 21 is formed by recessing the cross member body 2 downward in the vertical direction of the vehicle, and the area of the cavity 6 to be formed can be increased, thereby improving the torsional rigidity of the vehicle body C ring structure.

Optionally, in an embodiment of the present disclosure, at least two protrusions 13 arranged along the front-rear direction of the vehicle are formed on the object placing plate 1, the protrusions 13 protrude in a direction away from the cross beam body 2, the protrusions 13 correspond to the recesses 21 one by one, and each protrusion 13 and the corresponding recess 21 together enclose the cavity 6.

In the present embodiment, the convex portion 13 and the concave portion 21 are disposed opposite to each other, and the cavity 6 formed by the convex portion 13 and the concave portion 21 may be in a shape of a "square". In some examples, the convex portion 13 is a structure in which the storage board 1 is formed to be convex upward in the up-down direction of the vehicle, constituting a convex structure.

The cavity 6 formed by the convex part 13 and the concave part 21 can effectively increase the area of the closed section of the cavity 6, thereby improving the torsional rigidity of the formed vehicle body C ring structure.

Alternatively, the length of the convex portion 13 in the front-rear direction of the vehicle is equal to the length of the concave portion 21 in the front-rear direction of the vehicle, so that each convex portion 13 and each concave portion 21 can constitute one cavity 6 having a completely closed cross section.

Optionally, in an embodiment of the present disclosure, there is a convex surface 23 between two adjacent concave portions 21, and there is a concave surface 15 between two adjacent convex portions 13, and the convex surface 23 is connected to the corresponding concave surface 15.

In the present embodiment, each protruding surface 23 and the recessed surface 15 can be welded and fixed, and the structure of the plurality of cavities 6 can be formed by connecting the protruding surfaces 23 and the recessed surfaces 15, and meanwhile, the connection strength between the storage plate 1 and the cross beam body 2 can be increased, thereby improving the torsional rigidity of the vehicle body. In some examples, there is one convex surface 23 between two adjacent concave portions 21 and one concave surface 15 between two adjacent convex portions 13.

It can be understood that, when the storage plate 1 and the beam body 2 are manufactured and molded, the convex portion 13 and the concave portion 21 can be formed by pressing according to design requirements, and then the middle positions of the convex portion 13 and the concave portion 21 are pressed together by an extrusion device for welding. Of course, the storage plate 1 and the beam body 2 may be manufactured to have a structure to be connected during press forming, and may be directly welded.

The height of the convex part 13 protruding upwards can be set according to the requirement, and the height of the concave part 21 sinking downwards can also be set according to the requirement.

Optionally, in other embodiments of the present disclosure, the protruding portions 13 and the recessed portions 21 are disposed in a staggered manner, wherein the protruding portions 13 and portions of the beam body 2 together form the cavity 6, and the recessed portions 21 and the storage plate 1 together form the cavity 6. So set up, can dodge other parts as required, improve the flexibility.

Alternatively, in one embodiment of the present disclosure, the cross-section of the cavity 6 may be in the shape of a "square". Through such setting, the torsional rigidity of automobile body can be better improved.

Optionally, in an embodiment of the present disclosure, the front end of the convex portion 13 located at the front portion of the storage plate 1 has a first flange 16 extending obliquely downward, the front end of the concave portion 21 located at the front portion of the cross beam body 2 has a second flange 24 extending obliquely downward, and the first flange 16 overlaps the second flange 24.

In the present embodiment, the convex portion 13 located at the front portion of the storage board 1 is the one convex portion 13 located at the foremost end of the storage board 1 in the front-rear direction of the vehicle. The recess 21 at the front portion of the cross member body 2 refers to a recess 21 at the foremost end of the cross member body 2 in the vehicle front-rear direction, wherein the first flange 16 and the second flange 24 are inclined obliquely downward to make room for the passenger compartment.

Optionally, in an embodiment of the present disclosure, the storage board 1 includes a front board body 11 and a rear board body 12 formed at a rear end of the front board body 11, the protruding portion 13 is located on the front board body 11, the cross beam body 2 is located below the front board body 11, a rear end of the recessed portion 21 located at a rear portion of the cross beam body 2 is provided with a third flange 25, and the third flange 25 is overlapped with a bottom surface of the rear board body 12.

In this embodiment, the front plate 11 can be connected to the beam body 2, so that the front plate 11 can form a cavity 6 structure with the beam body 2, and the rear plate 12 can be used to connect structures such as a trunk hinge, and it should be noted that the upper surface of the front plate 11 can also be used to connect structures such as a trunk hinge, and the structures can be specifically selected according to different vehicle types. The third flange 25 overlaps the bottom surface of the rear panel body so that the cross-section of the cavity 6 is a closed cross-section.

Alternatively, the area of the cross section of the cavity 6 increases in the front-to-rear direction in this order. Through the design, the area of the cross section of the cavity 6 can be increased as much as possible in an effective space, meanwhile, the use space of the luggage case can not be compressed, and the positions of other parts can not be invaded.

Optionally, in an embodiment of the present disclosure, the object placing plate 1 is formed with a first positioning portion 14, and the cross beam body 2 is formed with a second positioning portion 22 engaged with the first positioning portion 14.

In the present embodiment, the first positioning portion 14 and the second positioning portion 22 may be fixed by welding. The first positioning part 14 and the second positioning part 22 can be connected and positioned conveniently, and the object placing plate 1 and the beam body 2 can be assembled and positioned conveniently and then connected.

Alternatively, in one embodiment of the present disclosure, the first positioning portion 14 is a groove formed in the front portion of the storage board 1, and the second positioning portion 22 is a protrusion formed in the front portion of the cross beam body 2.

Alternatively, the first positioning portion 14 is a protrusion formed on the front portion of the storage board 1, and the second positioning portion 22 is a groove formed on the front portion of the cross beam body 2.

In the present embodiment, when the second positioning portion 22 is a groove, the width and the depth of the second positioning portion 22 are greater than the width and the depth of the first positioning portion 14, so that the first positioning portion 14 is disposed in the second positioning portion 22, and a positioning effect can be achieved. When the second positioning portion 22 is a protrusion, the width and depth of the first positioning portion 14 are greater than those of the second positioning portion 22, so that the second positioning portion 22 is disposed in the first positioning portion 14, and positioning effect can be achieved.

In some examples, the contact surfaces of the second positioning portion 22 and the first positioning portion 14 may be fixed by welding.

It can be understood that, when the object placing plate 1 is assembled with the cross beam body 2, the first positioning portion 14 is placed in the second positioning portion 22, and then welding is performed. Through so setting up, can do benefit to and put the positioning of thing board 1 and crossbeam body 2, improve assembly efficiency.

In some examples, for a shelf having a first flange 16, the first detent 14 may be located on the first flange 16, and for a beam body 2 having a second flange 24, the second flange 24 may be located on the second flange 24.

Alternatively, in an embodiment of the present disclosure, the number of the first positioning portions 14 and the second positioning portions 22 is multiple and corresponds to one another, and the multiple first positioning portions 14 and the multiple second positioning portions 22 are arranged at intervals in the left-right direction of the vehicle.

In the present embodiment, each first positioning portion 14 can be correspondingly inserted into each second positioning portion 22, so that the positioning effect can be improved, and the connection strength can be improved by connecting the plurality of first positioning portions 14 and the plurality of second positioning portions 22.

Optionally, in an embodiment of the present disclosure, the cross beam body 2 is located below the front plate body 11 and encloses at least two cavities 6 together with the front plate body 11, a dimension of the front plate body 11 in the front-rear direction of the vehicle is 200mm to 300mm, a dimension of the rear plate body 12 in the front-rear direction of the vehicle is 500mm to 600mm, and a dimension of the cross beam body 2 in the front-rear direction of the vehicle is 200mm to 300mm. By arranging the front plate body 11 and the cross beam body 2 in the front-rear direction of the vehicle, the area of the cross section of the cavity 6 is increased again, and the torsional rigidity of the vehicle body can be effectively improved.

Alternatively, in one embodiment of the present disclosure, the number of the cavities 6 is two, and one cavity 6 of the two cavities 6 has a size of 80mm to 120mm in the front-rear direction of the vehicle and a size of 40mm to 60mm in the up-down direction of the vehicle. The other cavity 6 of the two cavities 6 has a dimension of 60mm to 80mm in the front-rear direction of the vehicle and a dimension of 20mm to 30mm in the up-down direction of the vehicle. Through the arrangement, the torsional rigidity of the vehicle body can be effectively improved.

Alternatively, in an embodiment of the present disclosure, the number of the convex portions 13 is two, the number of the concave portions 21 is two, one of the convex portions 13 and one of the concave portions 21 together form one cavity 6, and the other convex portion 13 and the other concave portion 21 together form the other cavity 6.

Optionally, in an embodiment of the present disclosure, the cross beam assembly further includes two connecting brackets 3 disposed opposite to each other in the left-right direction of the vehicle, the two connecting brackets 3 are respectively connected to two ends of the cross beam body 2 in the left-right direction of the vehicle, and the connecting brackets 3 are used for being connected with the wheel housing 5.

Wherein, in this embodiment, two linking bridge 3 can support crossbeam body 2, do benefit to simultaneously to be connected with other parts. In some examples, two connecting brackets 3 are welded and fixed to both ends of the cross member body 2 in the left-right direction of the vehicle, respectively.

As shown in fig. 7, the second aspect of the present disclosure also provides a vehicle body C-ring structure assembly, which includes two wheel houses 5 arranged oppositely in the left-right direction of the vehicle, a bottom beam 4, and the above-mentioned cross beam assembly of the vehicle body C-ring.

The two ends of the cross beam assembly in the left-right direction of the vehicle are respectively connected with the upper parts of the two wheel covers 5, and the lower parts of the two wheel covers 5 are respectively connected with the two ends of the bottom beam 4 in the left-right direction of the vehicle, so that the two wheel covers 5, the bottom beam 4 and the cross beam assembly jointly form a ring frame structure.

Wherein, form annular frame structure jointly through two wheel casings 5, floorbar 4 and crossbeam assembly, promptly for C ring structure, the torsional rigidity that can effectual increase automobile body can satisfy the demand of electronic new forms of energy car in the aspect of torsional rigidity. In some examples, the two connecting brackets 3 are connected to the two wheel houses 5, respectively.

The third aspect of the present disclosure also provides a vehicle including the above-mentioned vehicle body C-ring structure assembly.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A beam assembly of a C-ring of a vehicle body is characterized by comprising an object placing plate and a beam body;

the transverse beam body extends along the left and right directions of a vehicle, the object placing plate covers the transverse beam body, the object placing plate and the transverse beam body jointly enclose at least two cavities which are distributed along the front and back directions of the vehicle, and the cross sections of the cavities are closed cross sections.

2. The cross beam assembly of a C-ring of a vehicle body as claimed in claim 1, wherein the cross beam body is formed with at least two recesses arranged along a front-rear direction of the vehicle, the recesses being recessed toward a direction away from the shelf, the at least two recesses and the shelf together enclosing at least two of the cavities.

3. The cross beam assembly of the C-ring of the vehicle body as claimed in claim 2, wherein at least two protrusions are formed on the shelf and arranged along the front-rear direction of the vehicle, the protrusions protrude in a direction away from the cross beam body, the protrusions and the recesses correspond one to one, and each protrusion and the corresponding recess together enclose the cavity.

4. The cross-member assembly for the C-ring of the vehicle body as claimed in claim 3, wherein a convex surface is provided between two adjacent concave portions, a concave surface is provided between two adjacent convex portions, and the convex surface is connected with the corresponding concave surface.

5. The cross-member assembly for a C-ring of a vehicle body of claim 3, wherein a front end of the convex portion of the front portion of the shelf has a first flange extending obliquely downward, and a front end of the concave portion of the front portion of the cross-member body has a second flange extending obliquely downward, the first flange overlapping the second flange.

6. The cross beam assembly of the C-ring of the vehicle body as claimed in claim 3, wherein the storage plate comprises a front plate body and a rear plate body formed at the rear end of the front plate body, the convex portion is located on the front plate body, the cross beam body is located below the front plate body, a third flange is arranged at the rear end of the concave portion located at the rear portion of the cross beam body, and the third flange is in lap joint with the bottom surface of the rear plate body.

7. The cross-member assembly of a C-ring of a vehicle body of claim 1, wherein the cross-section of the cavity increases in area in a direction from front to back.

8. The cross member assembly of the C-ring of the vehicle body according to any one of claims 1 to 7, wherein a first positioning portion is formed on the shelf, and a second positioning portion that engages with the first positioning portion is formed on the cross member body.

9. The cross-member assembly of a vehicle body C-ring according to claim 8, wherein the first positioning portion is a groove formed in a front portion of the parcel plate, and the second positioning portion is a projection formed in a front portion of the cross-member body; alternatively, the first and second electrodes may be,

the first positioning part is a bulge formed at the front part of the object placing plate, and the second positioning part is a groove formed at the front part of the beam body.

10. The cross member assembly of the C-ring of the vehicle body according to claim 8, wherein the first positioning portion and the second positioning portion are provided in plural numbers and in one-to-one correspondence, and the first positioning portion and the second positioning portion are provided at intervals in a left-right direction of the vehicle.

11. The cross beam assembly of the C-ring of the vehicle body as claimed in any one of claims 1 to 5, wherein the storage plate comprises a front plate body and a rear plate body formed at the rear end of the front plate body, the cross beam body is located below the front plate body and encloses at least two cavities together with the front plate body, the front plate body has a dimension in a front-rear direction of the vehicle of 200mm to 300mm, the rear plate body has a dimension in the front-rear direction of the vehicle of 500mm to 600mm, and the cross beam body has a dimension in the front-rear direction of the vehicle of 200mm to 300mm.

12. The cross-member assembly of a C-ring for a vehicle body according to any one of claims 1 to 7, wherein the number of said cavities is two, and one of the two cavities has a dimension of 80mm to 120mm in a front-rear direction of the vehicle and a dimension of 40mm to 60mm in an up-down direction of the vehicle;

13. The cross beam assembly of the C-ring of the vehicle body according to any one of claims 1 to 7, further comprising two connecting brackets oppositely arranged in the left-right direction of the vehicle, the two connecting brackets being respectively connected to both ends of the cross beam body in the left-right direction of the vehicle, the connecting brackets being used for connecting with wheel covers.

14. A vehicle body C-ring structure assembly, which is characterized by comprising two wheel covers and a bottom beam which are oppositely arranged in the left-right direction of a vehicle, and a cross beam assembly of a vehicle body C-ring according to any one of claims 1-13;

15. A vehicle comprising the body C-ring structure assembly of claim 14.