CN115892246A - Floor structure and have its vehicle behind automobile body - Google Patents

Abstract

The invention provides a vehicle body rear floor structure and a vehicle with the same, comprising: the rear floor assembly comprises a rear floor and two rear wheel casing inner plate structures; a shock absorber mounting hole and a shock absorber fixing structure are arranged on the surface of the rear wheel cover inner plate structure protruding towards the top of the vehicle body; the rear floor and the rear wheel cover inner plate structure are integrally arranged in a die-casting mode. This application sets up two rear wheel casing inner panel structures respectively in the both sides on back floor, and rear wheel casing inner panel structure be equipped with bumper shock absorber mounting hole and bumper shock absorber fixed knot structure on the bellied surface in automobile body top, back floor and rear wheel casing inner panel structure are the setting of integrative die-casting, make integrative die-casting with back floor structure height integrated, and make full use of die-casting structure variable cross section unequal material thickness structural feature, form the cage structure of high rigidity, effectively bear and transmit automobile body load, guarantee the reliable and durability performance of structure on back floor, optimize back floor size precision, promote the stability of automobile body rigidity and vehicle operation.

Description

Floor structure and have its vehicle behind automobile body

Technical Field

The invention relates to the technical field of vehicles, in particular to a rear floor structure of a vehicle body and a vehicle with the same.

Background

The rear floor is used as a main component of the vehicle body, the road surface excitation load is transferred to the whole vehicle body through the longitudinal beams and the wheel covers, and the force transfer path of the rear floor and the strength and the rigidity of the rear floor directly influence the running reliability, durability, operation stability and driving of the vehicle.

The suspension is integrated (highly elastic and shock-absorbing) by the aid of the springs and the shock absorbers arranged at a high position, the integration level of the suspension is improved, the arrangement space of the suspension is optimized, the arrangement space of parts for improving the manipulation performance such as a rear wheel steering part and an active stabilizer bar can be reserved, and the influence of the function of the chassis on the volume of the trunk can be reduced. The high-elasticity damping suspension has the advantages that the spring and the shock absorber are integrated on one axis, the road surface excitation load is correspondingly concentrated on one point of the rear wheel cover, the height of the fixed point is raised relative to the vehicle body of the elastic damping separation suspension, the torsional rigidity of the vehicle body is very unfavorable, and the stability and the driving stability of the support are influenced by the reduction of the torsional rigidity; in addition, the load in the rear wheel house area is also greatly increased, and the vehicle body is damaged even if the load locally exceeds the standard.

The traditional rear floor suitable for the high-elasticity suspension is of a steel plate punching and welding structure or an aluminum alloy die-casting structure locally, all parts are connected in a spot welding mode, a self-piercing riveting (SPR) mode, a self-melting self-tapping (FDS) mode and the like, the integral rigidity performance is limited, the torsional rigidity is difficult to improve, and the driving performance of the whole vehicle is directly influenced; because the number of connecting points is limited, the overall force transmission effect is also limited, and when the individual connecting points have process defects, the risk of damage to the vehicle body caused by local damage is high. In addition, the number of parts of the traditional rear floor structure is large, the size tolerance is easy to accumulate and transfer, the size precision control difficulty of the assembly is high, the size out-of-tolerance can also influence the precision of system matching, and the problems of abnormal sound in driving and the like can be caused.

In view of the above technical problems, no effective solution has been proposed at present.

Disclosure of Invention

The invention mainly aims to provide a rear floor structure of a vehicle body and a vehicle with the rear floor structure, and aims to solve the problems of poor vehicle body rigidity and poor vehicle operation stability caused by too low dimensional accuracy of a rear floor in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a vehicle body rear floor structure including: the rear floor assembly comprises a rear floor and two rear wheel cover inner plate structures, the two rear wheel cover inner plate structures are respectively arranged on two sides of the rear floor, the rear floor extends along the length direction of the vehicle body, and at least part of the rear wheel cover inner plate structures extend along the height direction of the vehicle body; a shock absorber mounting hole and a shock absorber fixing structure are arranged on the surface of the rear wheel cover inner plate structure protruding towards the top of the vehicle body, the shock absorber mounting hole is used for mounting a suspension spring shock absorber integrated structure, the shock absorber fixing structure is arranged adjacent to the shock absorber mounting hole, the shock absorber fixing structure is used for fixing the suspension spring shock absorber integrated structure, and a parcel shelf beam assembly is arranged between the two shock absorber fixing structures; wherein, the rear floor and the rear wheel casing inner plate structure are arranged in an integrated die-casting way.

Further, the rear floor includes: the rear longitudinal beams extend along the length direction of the vehicle body and are connected with the rear wheel casing inner plate structure, and the number of the rear longitudinal beams is two; a first cross beam, a second cross beam, a third cross beam and a fourth cross beam are sequentially arranged between the two rear longitudinal beams along the length direction of the rear longitudinal beams, the first cross beam, the second cross beam, the third cross beam and the fourth cross beam extend along the width direction of the vehicle body, wherein the first cross beam is connected with the end part of the rear longitudinal beam, and the third cross beam and the wrapping frame cross beam assembly are correspondingly arranged in the height direction of the vehicle body; and at least one of the junction of the rear longitudinal beam and the second cross beam and the junction of the rear longitudinal beam and the fourth cross beam is provided with a rear auxiliary frame fixing point.

Further, a rear floor plane area is arranged between the second cross beam and the fourth cross beam, the rear floor plane area comprises at least one first thickness area and at least one second thickness area, and the thickness of the first thickness area in the height direction of the vehicle body is larger than that of the second thickness area in the height direction of the vehicle body.

Further, the bottom of the second cross beam is provided with at least one battery fixing portion for fixing the vehicle-mounted battery.

Furthermore, at least one transverse reinforcing rib is arranged at the junction of the third cross beam and the rear longitudinal beam, and at least part of the transverse reinforcing ribs extend to the rear wheel casing inner plate structure along the height direction of the vehicle body.

Furthermore, the plane area of the rear floor is provided with a net-shaped rib structure.

Furthermore, at least one of the rear longitudinal beam, the first cross beam, the second cross beam and the fourth cross beam is provided with a reinforcing structure, and the reinforcing structure comprises at least one of a cross reinforcing rib, a herringbone reinforcing rib and an H-shaped reinforcing rib.

Further, the vehicle body rear floor structure further includes: the wheel casing diagonal brace is at least one, one end of the wheel casing diagonal brace is connected with the rear longitudinal beam, and the other end of the wheel casing diagonal brace is connected with the shock absorber fixing structure; the wheel casing cross strengthening rib, the wheel casing cross strengthening rib is close to the bottom setting of rear wheel casing inner panel structure in the automobile body direction of height.

Further, the damper fixing structure includes: the shock absorber mounting hole is formed in the shock absorber mounting hole, and the shock absorber mounting hole is formed in the shock absorber mounting hole; the fixed point annular reinforcing rib is arranged around the shock absorber fixing hole; the first annular reinforcing rib extends around the circumference of the shock absorber mounting hole, and is tangent to the end part, close to the shock absorber mounting hole, of the fixed point annular reinforcing rib; the second annular reinforcing rib extends along the circumferential direction of the shock absorber mounting hole, and is tangent to the farthest point of the fixed point annular reinforcing rib, which is far away from the shock absorber mounting hole; the radial reinforcing ribs extend along the radial direction of the shock absorber mounting hole and are arranged in a plurality.

According to another aspect of the present invention, there is provided a vehicle having a rear body floor structure, which is the above-described rear body floor structure.

By applying the technical scheme of the invention, two rear wheel cover inner plate structures are respectively arranged on two sides of a rear floor, at least part of the rear wheel cover inner plate structures extend along the height direction of a vehicle body, the surface of the rear wheel cover inner plate structure, which protrudes towards the top of the vehicle body, is provided with a shock absorber mounting hole and a shock absorber fixing structure, and the rear floor and the rear wheel cover inner plate structures are integrally arranged in a die-casting manner, so that the rear floor structure is highly integrated by integral die-casting, the characteristic of the die-casting structure that the variable cross section of the die-casting structure is unequal in material thickness is fully utilized, a cage structure with high rigidity is formed, the load of the vehicle body is effectively borne and transferred, the structural reliability and durability of the rear floor are ensured, the dimensional precision of the rear floor is optimized, and the rigidity of the vehicle body and the stability of vehicle operation are improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of a first embodiment of a rear floor structure of a vehicle body according to the invention;

FIG. 2 is a schematic structural view showing a second embodiment of a rear floor structure of a vehicle body according to the present invention;

FIG. 3 shows an enlarged schematic view at A in FIG. 2;

FIG. 4 is a schematic structural view showing a third embodiment of a rear floor structure of a vehicle body according to the present invention;

FIG. 5 is a schematic structural view showing a fourth embodiment of a rear floor structure of a vehicle body according to the present invention;

fig. 6 shows a schematic structural view of a fifth embodiment of a rear floor structure of a vehicle body according to the present invention.

Wherein the figures include the following reference numerals:

1. a suspension spring damper integrated structure;

2. a rear floor; 22. a damper fixing structure; 221. a damper fixing hole; 222. a first annular reinforcing rib; 223. a second annular reinforcing rib; 224. radial reinforcing ribs; 225. a fixed point annular reinforcing rib;

211. a first cross member; 213. a third cross member; 214. reinforcing ribs; 215. a mesh rib; 231. the wheel cover diagonal draw bar; 232. a wheel cover cross reinforcing rib; 233. longitudinal beam herringbone ribs; 241. a second cross member; 242. a fourth cross member;

24. a rear stringer; 243. a longitudinal beam front section; 244. a longitudinal beam middle section; 245. a rear section of the longitudinal beam;

246. a rear subframe fixing point; 247. a first thickness region; 248. a second thickness region; 249. a battery fixing portion;

3. a wrap frame beam assembly; 31. a middle cross beam of the parcel shelf; 32. left and right beams of the parcel shelf.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.

Referring to fig. 1 to 6, according to an embodiment of the present application, a rear floor structure of a vehicle body is provided.

Concretely, a vehicle body rear floor structure includes: the rear floor assembly comprises a rear floor 2 and two rear wheel casing inner plate structures, the two rear wheel casing inner plate structures are respectively arranged on two sides of the rear floor 2, the rear floor 2 extends along the length direction of a vehicle body, and at least part of the rear wheel casing inner plate structures extend along the height direction of the vehicle body; a shock absorber mounting hole and a shock absorber fixing structure 22 are arranged on the surface of the rear wheel cover inner plate structure protruding towards the top of the vehicle body, the shock absorber mounting hole is used for mounting the suspension spring shock absorber integrated structure 1, the shock absorber fixing structure 22 is arranged adjacent to the shock absorber mounting hole, the shock absorber fixing structure 22 is used for fixing the suspension spring shock absorber integrated structure 1, and a parcel shelf beam assembly 3 is arranged between the two shock absorber fixing structures 22; wherein, the rear floor 2 and the rear wheel casing inner plate structure are arranged in an integrated die-casting way.

In this embodiment, as shown in fig. 1 and fig. 2, two rear wheel casing inner plate structures are respectively disposed on two sides of a rear floor, at least part of the rear wheel casing inner plate structures extend along a height direction of a vehicle body, and a shock absorber mounting hole and a shock absorber fixing structure are disposed on a surface of the rear wheel casing inner plate structure protruding toward the top of the vehicle body, the rear floor and the rear wheel casing inner plate structures are integrally die-cast, so that the rear floor structure is highly integrated through integral die-casting, and the characteristics of the die-cast structure that the variable cross-section of the die-cast structure is unequal in material thickness are fully utilized to form a cage structure with high rigidity, so as to effectively bear and transfer vehicle body loads, ensure the structural reliability and durability of the rear floor, optimize the size precision of the rear floor, and improve the vehicle rigidity and the stability of vehicle operation.

As shown in fig. 3, the rear floor panel 2 includes: the rear longitudinal beams 24 extend along the length direction of the vehicle body, the rear longitudinal beams 24 are connected with the rear wheel casing inner plate structure, and the number of the rear longitudinal beams 24 is two; a first cross beam 211, a second cross beam 241, a third cross beam 213 and a fourth cross beam 242 are sequentially arranged between the two rear longitudinal beams 24 along the length direction of the rear longitudinal beams 24, the first cross beam 211, the second cross beam 241, the third cross beam 213 and the fourth cross beam 242 are all arranged in an extending manner along the width direction of the vehicle body, wherein the first cross beam 211 is connected with the end part of the rear longitudinal beam 24, and the third cross beam 213 and the wrapping frame cross beam assembly 3 are correspondingly arranged in the height direction of the vehicle body; at least one of the junction of the rear side member 24 and the second cross member 241 and the junction of the rear side member 24 and the fourth cross member 242 is provided with a rear sub frame fixing point 246. In this embodiment, between the left and right rear longitudinal beams, the first crossbeam 211 that distributes around, the second crossbeam 241, 4 crossbeam structures altogether of third crossbeam 213 and fourth crossbeam 242, and 4 crossbeams are the shape of falling the U-shaped cross-section, first crossbeam 211 is located the foremost end of back floor, second crossbeam 241 is located between the front fixing point of back sub vehicle frame, fourth crossbeam 242 is located between the rear fixing point of back sub vehicle frame, and first crossbeam 211, second crossbeam 241 and fourth crossbeam 242 crossbeam are equipped with the chevron shape strengthening rib, third crossbeam 213 is located parcel frame beam assembly 3 below, constitute through the arc of die casting surface uplift, and the crossbeam part need have sufficient thickness, the inside strengthening rib that does not establish. The rear floor is provided with 4 rear subframe fixing points 246 and is located at the junction of the cross beam and the longitudinal beam, so that the rear floor is more stable. And, parcel frame beam assembly 3 is connected by parcel frame middle beam 31 and parcel frame left and right sides crossbeam 32 spot welding and constitutes, and parcel frame beam assembly 3 passes through SPR (self-piercing riveting) and FDS (hot melt self tapping) with back floor 2 and connects.

Further, a rear floor plane area is provided between the second cross member 241 and the fourth cross member 242, the rear floor plane area includes at least one first thickness area 247 and a second thickness area 248, the thickness of the first thickness area 247 in the height direction of the vehicle body is set to be larger than the thickness of the second thickness area 248 in the height direction of the vehicle body. The first thickness area 247 can optimize the aluminum liquid fluidity and cooling speed of the large-area plane area, so as to achieve better filling effect of the casting.

As shown in fig. 3, at least one battery fixing portion 249 is provided at the bottom of the second cross member 241, and the battery fixing portion 249 is used for fixing the vehicle-mounted battery. This arrangement ensures that the vehicle-mounted battery can be firmly and reliably fixed to the battery fixing portion 249 on the second cross member 241. The battery fixing portion 249 is disposed at the bottom of the second cross member 241, so that the vehicle body load at the battery fixing point can be dispersed to a larger vehicle body range through the "cage type rear floor" force transmission structure, thereby satisfying the requirements of reliability and durability of the battery fixing portion 249.

In an exemplary embodiment of the present application, two battery fixing portions 249 are disposed at the bottom of the second cross beam 241, the battery fixing portions 249 are located at the root of the second cross beam 241, and the fixing points are 8-shaped and staggered with the herringbone ribs of the second cross beam 241.

Further, at least one transverse reinforcing rib 214 is arranged at the junction of the third cross beam 213 and the rear longitudinal beam 24, and at least part of the transverse reinforcing rib 214 extends to the rear wheel house inner panel structure along the height direction of the vehicle body. In this embodiment, three transverse reinforcing ribs are respectively disposed at the junctions between the two sides of the third cross beam 213 and the rear longitudinal beam 24, and the reinforcing ribs span the junctions between the two sides and extend to the wheel casing by a certain height, so that the third cross beam is ensured to be more stable and less prone to deformation.

Specifically, the rear floor plane area is provided with a web-like rib 215 structure. The rigidity of the large plane area of the integrated die-casting floor can be improved, the deformation in the cooling process is reduced, the impact trace of the die-casting aluminum liquid is weakened, and the appearance quality of parts is improved.

Further, at least one of the rear longitudinal beam 24, the first cross beam 211, the second cross beam 241 and the fourth cross beam 242 is provided with a reinforcing structure, and the reinforcing structure comprises at least one of a cross-shaped reinforcing rib, a herringbone reinforcing rib and an H-shaped reinforcing rib. The arrangement can improve the torsion resistance and the rigidity of the rear floor and the vehicle body.

As shown in fig. 5, the vehicle body rear floor structure further includes: the wheel casing diagonal rib 231 is provided with at least one wheel casing diagonal rib 231, one end of the wheel casing diagonal rib 231 is connected with the rear longitudinal beam 24, and the other end of the wheel casing diagonal rib 231 is connected with the shock absorber fixing structure 22; a wheel cover cross reinforcing rib 232, the wheel cover cross reinforcing rib 232 is arranged close to the bottom of the rear wheel cover inner plate structure in the height direction of the vehicle body. In the embodiment, in the invention, a third beam 213, a transverse reinforcing rib 214, a wheel casing diagonal rib 231, a damper fixing structure 22 and a wrap frame beam assembly 3 form a middle annular force transfer structure, a wheel casing, the damper fixing structure 22, the wheel casing diagonal rib 231, a wheel casing cross reinforcing rib 232 and a longitudinal beam middle section 244 form two side annular force transfer structures, a longitudinal beam rear section 245 and a rear periphery form a rear annular force transfer structure, and the damper fixing structure 22 and the wheel casing form 4 longitudinal force transfer paths on two sides and are connected in series with 5 annular force transfer paths to form a cage type rear floor force transfer structure.

As shown in fig. 3, the damper fixing structure 22 includes: the shock absorber fixing holes 221 are multiple, the shock absorber fixing holes 221 are distributed along the circumferential direction of the shock absorber mounting hole, the shock absorber fixing holes 221 are provided with fixing point annular reinforcing ribs 225 at intervals with the hole wall of the shock absorber mounting hole, and the fixing point annular reinforcing ribs 225 are arranged around the shock absorber fixing holes 221; a first annular reinforcing rib 222, wherein the first annular reinforcing rib 222 extends around the circumference of the damper mounting hole, and the first annular reinforcing rib 222 is tangent to the end of the fixed point annular reinforcing rib 225 close to the damper mounting hole; the second annular reinforcing rib 223 extends along the circumferential direction of the shock absorber mounting hole, and the second annular reinforcing rib 223 is tangent to the farthest point of the fixed point annular reinforcing rib 225, which is far away from the shock absorber mounting hole; and a plurality of radial ribs 224, wherein the radial ribs 224 extend in the radial direction of the damper mounting hole, and the number of the radial ribs 224 is plural. In this embodiment, the first annular reinforcing rib 222, the second annular reinforcing rib 223 and the fixed point annular reinforcing rib 225 form a "planetary gear-shaped" structure, and the "spider web structure" formed by the combination of the radial reinforcing ribs 224 can uniformly distribute the stress from the fixed point to the whole wheel casing top surface area, and then distribute the stress to a larger vehicle body range through the "cage type rear floor" force transmission structure, so as to meet the requirements of reliability and durability of the shock absorber fixing structure 22 area.

In another embodiment of the present application, the vehicle body rear floor structure further includes a side member herringbone rib 233, a side member front section 243, a side member middle section 244, and a side member rear section 245. The cross ribs are arranged on the front sections 243 of the longitudinal beams, so that the force transmission performance of the longitudinal beams under the front collision working condition can be improved, and the front collision safety is improved. The H-shaped parallel reinforcing ribs are arranged on the rear section 245 of the longitudinal beam, so that the collapsing energy absorption performance of the rear longitudinal beam during rear collision can be improved, and the safety of the rear collision is improved. The herringbone reinforcing ribs are arranged on the longitudinal beam middle sections 244, so that the torsion resistance can be improved, and the rigidity of the rear floor and the rigidity of the vehicle body can be improved.

In another embodiment of the present application, there is also provided a vehicle having a rear body floor structure, which is the above-described rear body floor structure.

For ease of description, spatially relative terms such as "over 8230," "upper surface," "above," and the like may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; below". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A vehicle body rear floor structure, comprising:

the rear floor assembly comprises a rear floor (2) and two rear wheel cover inner plate structures, the two rear wheel cover inner plate structures are respectively arranged on two sides of the rear floor (2), the rear floor (2) extends along the length direction of a vehicle body, and at least part of the rear wheel cover inner plate structures extend along the height direction of the vehicle body;

a shock absorber mounting hole and a shock absorber fixing structure (22) are formed in the surface, protruding towards the top of the vehicle body, of the rear wheel cover inner plate structure, the shock absorber mounting hole is used for mounting a suspension spring shock absorber integrated structure (1), the shock absorber fixing structure (22) is arranged adjacent to the shock absorber mounting hole, the shock absorber fixing structure (22) is used for fixing the suspension spring shock absorber integrated structure (1), and a parcel shelf beam assembly (3) is arranged between the two shock absorber fixing structures (22);

the rear floor (2) and the rear wheel casing inner plate structure are integrally arranged in a die-casting mode.

2. The vehicle body rear floor structure according to claim 1, characterized in that the rear floor (2) includes:

the rear longitudinal beams (24) extend along the length direction of the vehicle body, the rear longitudinal beams (24) are connected with the rear wheel casing inner plate structure, and the number of the rear longitudinal beams (24) is two;

a first cross beam (211), a second cross beam (241), a third cross beam (213) and a fourth cross beam (242) are sequentially arranged between the two rear longitudinal beams (24) along the length direction of the rear longitudinal beams (24), the first cross beam (211), the second cross beam (241), the third cross beam (213) and the fourth cross beam (242) are all arranged in an extending mode along the width direction of a vehicle body, the first cross beam (211) is connected with the end portion of the rear longitudinal beams (24), and the third cross beam (213) and the wrapping frame cross beam assembly (3) are correspondingly arranged in the height direction of the vehicle body;

at least one of a junction of the rear longitudinal beam (24) and the second cross beam (241) and a junction of the rear longitudinal beam (24) and the fourth cross beam (242) is provided with a rear subframe fixing point (246).

3. The vehicle body rear floor structure according to claim 2, wherein a rear floor plane region is provided between the second cross member (241) and the fourth cross member (242), the rear floor plane region includes a first thickness region (247) and a second thickness region (248), the first thickness region (247) is at least one, and a thickness of the first thickness region (247) in the vehicle body height direction is set larger than a thickness of the second thickness region (248) in the vehicle body height direction.

4. The vehicle body rear floor structure according to claim 2, characterized in that a bottom portion of the second cross member (241) is provided with at least one battery fixing portion (249), the battery fixing portion (249) being for fixing a vehicle-mounted battery.

5. The vehicle body rear floor structure according to claim 2,

at least one transverse reinforcing rib (214) is arranged at the junction of the third cross beam (213) and the rear longitudinal beam (24), and at least part of the transverse reinforcing rib (214) extends to the rear wheel cover inner plate structure along the height direction of the vehicle body.

6. A vehicle body rear floor structure according to claim 3, characterized in that said rear floor plane area is provided with a web rib (215) structure.

7. A vehicle body rear floor structure according to claim 3, characterized in that at least one of said rear side member (24), said first cross member (211), said second cross member (241), and said fourth cross member (242) is provided with a reinforcing structure including at least one of a cross-shaped reinforcing rib, a chevron-shaped reinforcing rib, and an H-shaped reinforcing rib.

8. The vehicle body rear floor structure according to claim 2, further comprising:

the wheel cover diagonal draw bars (231) are at least one, one end of each wheel cover diagonal draw bar (231) is connected with the rear longitudinal beam (24), and the other end of each wheel cover diagonal draw bar (231) is connected with the shock absorber fixing structure (22);

the wheel casing cross reinforcing rib (232), wheel casing cross reinforcing rib (232) are close to rear wheel casing inner panel structure is in the ascending bottom setting of automobile body direction of height.

9. The vehicle body rear floor structure according to claim 1, wherein the shock absorber fixing structure (22) includes:

the shock absorber mounting hole structure comprises a plurality of shock absorber fixing holes (221), the shock absorber fixing holes (221) are distributed along the circumferential direction of the shock absorber mounting hole, and the shock absorber fixing holes (221) are arranged at a distance from the hole wall of the shock absorber mounting hole;

a fixed point annular bead (225), the fixed point annular bead (225) being disposed around the damper fixing hole (221);

a first annular reinforcing rib (222), wherein the first annular reinforcing rib (222) is arranged around the circumferential extension of the shock absorber mounting hole, and the first annular reinforcing rib (222) is tangent to the end part of the fixed point annular reinforcing rib (225) close to the shock absorber mounting hole;

a second annular reinforcing bead (223), the second annular reinforcing bead (223) extending in the circumferential direction of the damper mounting hole, and the second annular reinforcing bead (223) being tangent to the farthest point of the fixed-point annular reinforcing bead (225) from the damper mounting hole;

and a plurality of radial ribs (224), wherein the radial ribs (224) extend in the radial direction of the damper mounting hole, and the number of the radial ribs (224) is multiple.

10. A vehicle having a rear body floor structure, characterized in that the rear body floor structure is the rear body floor structure of any one of claims 1-9.

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