CN211893420U - Joint structure of front beam of rear floor - Google Patents

Abstract

The utility model discloses a back floor front beam joint design, including beam assembly, back longeron and threshold back plate, the back longeron with the threshold back plate has the overlap portion in corresponding position department, the back longeron with the threshold back plate corresponds the two-layer formula of position department and fixes at the overlap portion, beam assembly's both ends respectively with the front and back both sides the back longeron overlap joint, beam assembly with the back longeron is fixed at the two-layer formula of lapped corresponding position department, both ends extend to about beam assembly the threshold back plate, beam assembly's outside integrated into one piece or fixed at least one first turn-ups that is provided with, first turn-ups with the two-layer formula of threshold back plate is fixed. The utility model discloses a rear floor front beam joint structure simple structure, showing and improving assembly size precision, showing continuity, the optimization power transmission route that improves the rear beam cavity and improving the auttombilism security.

Description

Joint structure of front beam of rear floor

Technical Field

The utility model relates to an automobile body technical field especially relates to a rear floor front beam joint design.

Background

In the automobile body manufacturing industry, when rear frame and threshold back plate are connected, often can be because the back floor is split with the back floor when back floor and preceding floor overlap joint height drop are great, but when the back floor split, there is following defect in the back crossbeam not split meeting: the rear floor is disassembled, and the development cost of parts is increased; the rear floor beam is not connected with the rear doorsill plate at the joint lapped with the rear girder, so that the transmission of side impact force is not facilitated; the rear floor beam is not disassembled, so that when the rear floor beam is connected with the rear crossbeam and the threshold rear plate, the connection part of each part is not smooth, the matching difficulty of parts is increased, and the assembly size cannot be guaranteed.

Disclosure of Invention

The utility model relates to a solve not enough among the prior art and accomplish, the utility model aims at providing a simple structure, showing improvement assembly size precision, showing continuation, the optimization power transmission route that improves the rear frame member cavity and improving the rear floor front beam joint design of auttombilism security.

The utility model discloses a back floor front beam joint design, including beam assembly, back longeron and threshold back plate, the back longeron with the threshold back plate has the overlap portion in corresponding position department, the back longeron with the threshold back plate corresponds two-layer formula of position department at the overlap portion and fixes, beam assembly's both ends respectively with the front and back both sides the back longeron overlap joint, beam assembly with the back longeron is fixed at the two-layer formula of lapped corresponding position department, both ends extend to about beam assembly the threshold back plate, beam assembly's outside integrated into one piece or fixed at least one first turn-ups that is provided with, first turn-ups with the two-layer formula of threshold back plate is fixed.

The utility model discloses a joint structure of rear floor front beam can also be:

the beam assembly comprises a beam body and a beam extension piece, the longitudinal section of the beam body is U-shaped, one end of the beam extension piece is fixed with the end part of the beam body in a two-layer mode, the first flanging is arranged at the other end of the beam extension piece, and the beam extension piece is fixed with the rear longitudinal beam in a two-layer mode at a corresponding position.

The beam body and the beam extending piece are connected through an overlapping portion, and the beam body and the beam extending piece are fixed in a two-layer mode at the corresponding position of the overlapping portion.

The front side and the rear side of the beam extension piece are integrally formed or fixedly provided with second flanges, and the second flanges are fixed with the rear longitudinal beam in a two-layer mode.

The cross section of the rear longitudinal beam is U-shaped, a third flanging is integrally formed or fixedly arranged on the inner side of the rear longitudinal beam, the second flanging transversely extends along the rear longitudinal beam and is overlapped with the third flanging, and the second flanging and the third flanging are fixed in a two-layer mode at the corresponding positions of the overlapped parts.

The three first flanges are respectively arranged on the front side, the upper side and the rear side of the outer end of the beam extension piece and respectively extend forwards, upwards and backwards.

The beam assembly comprises a beam connecting piece, the transverse section of the beam connecting piece is an A-shaped plate body, the rear side part of the beam connecting piece is fixed with the rear longitudinal beam in a two-layer mode, the front outer side of the beam connecting piece is fixed with the beam extending piece in a two-layer mode, and the front inner side of the beam connecting piece is fixed with the beam body in a two-layer mode.

The rear side part of the cross beam connecting piece is integrally formed or fixedly provided with a first extending part, the first extending part extends from the rear side part of the cross beam connecting piece along the rear longitudinal beam, the first extending part and the rear longitudinal beam are provided with an overlapping part, and the first extending part and the rear longitudinal beam are fixed in a two-layer mode at the corresponding position of the overlapping part.

The front part of the beam connecting piece is integrally formed or fixedly provided with a second extending part, the second extending part extends from the front side part of the beam connecting piece along the beam extending piece, the second extending part and the beam extending piece are provided with an overlapping part, and the second extending part and the beam extending piece are fixed in a two-layer mode at the corresponding position of the overlapping part.

The second extension part and the beam body are provided with an overlapping part, and the second extension part and the beam body are fixed in a two-layer mode at the position corresponding to the overlapping part.

The utility model discloses a back floor front beam joint design, including beam assembly, back longeron and threshold back plate, the back longeron with the threshold back plate has the overlap portion in corresponding position department, the back longeron with the threshold back plate corresponds two-layer formula of position department at the overlap portion and fixes, beam assembly's both ends respectively with the front and back both sides the back longeron overlap joint, beam assembly with the back longeron is fixed at the two-layer formula of lapped corresponding position department, both ends extend to about beam assembly the threshold back plate, beam assembly's outside integrated into one piece or fixed at least one first turn-ups that is provided with, first turn-ups with the two-layer formula of threshold back plate is fixed. Thus, the outer side surface of the rear longitudinal beam is closely attached to and fixed with the doorsill rear plate in a two-layer mode, the beam assembly is fixed with the rear longitudinal beam in a two-layer mode, the beam assembly extends to the doorsill rear plate along the upper portion of the rear longitudinal beam, at least one first flanging is arranged on the outer side of the beam assembly, the first flanging and the doorsill buckle plate are provided with an overlapping part, the first flanging and the doorsill rear plate are fixed in a two-layer mode at the position corresponding to the overlapping part, when the side surface of an automobile is collided, side collision force is generated and transmitted to the beam assembly through the doorsill rear plate, the beam assembly is fixed with the rear longitudinal beam in a two-layer mode, the side collision force is dispersed to the rear longitudinal beam at the fixing position of the beam assembly and the rear longitudinal beam, one part of the side collision force is dispersed forwards along the rear longitudinal beam, and one part of the side collision force is dispersed backwards along the rear longitudinal beam, in this way, the side impact force transmitted along the cross beam assembly is greatly reduced, and the safety of the passengers in the automobile is further protected. And with the rear beam with the form of crossbeam subassembly, make every partial subassembly of rear beam can with the threshold back plate the better laminating of back longeron, and then be favorable to part stamping forming and improve part material utilization ratio, when preceding floor and back floor height drop are great, guaranteed the rear beam at horizontal continuity. The utility model discloses a rear floor front beam joint structure is, for prior art's advantage: the structure is simple, the assembly size precision is obviously improved, the continuity of the cavity of the rear cross beam is obviously improved, the force transmission path is optimized, and the driving safety of the automobile is improved.

Drawings

Fig. 1 the utility model relates to a joint structure overlap joint schematic diagram of a rear floor front beam.

Figure 2 the utility model discloses a rear floor front beam connects structure chart 1A-A section view

Fig. 3 the utility model relates to a joint design beam assembly top view before back floor.

Fig. 4 is a bottom view of the cross beam assembly of the front cross beam joint structure of the rear floor.

Description of the figures

1 … rear longitudinal beam 2 … threshold rear panel 3 … crossbeam extender

4 … crossbeam connecting piece 5 … crossbeam body 6 … first flanging

7 … second flange 8 … third flange 9 … first extension

10 … second extension 11 … fourth cuff

Detailed Description

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model provides a rear floor front beam joint design bilateral symmetry of the car left and right sides, the utility model discloses a rear floor front beam joint design that is located car body right side explains as an example. The beam extension 3 is on the front side, the beam connection 4 is on the rear side, the rocker rear panel 2 is on the outside, and the beam body 5 is on the inside, and thus the directions of "front", "rear", "left", "right", "up", "down", "inside" and "outside" are determined.

A front cross member joint structure of a rear floor according to the present invention will be described in detail with reference to fig. 1 to 2 of the drawings.

The utility model discloses a back floor front beam joint structure please refer to relevant each picture in 1 to 2, including beam assembly, back longeron 1 and threshold back plate 2, back longeron 1 with there is the overlap portion threshold back plate 2 in corresponding position department, back longeron 1 with threshold back plate 2 corresponds position department two-layer formula at the overlap portion and fixes, beam assembly's both ends respectively with both sides around 1 overlap joint of back longeron, beam assembly with back longeron 1 is fixed at the lapped two-layer formula of corresponding position department, beam assembly's the left and right sides both ends extend to threshold back plate 2, beam assembly's the outside integrated into one piece or fixed at least one first turn-ups 6 that is provided with, first turn-ups 6 with threshold back plate 2 two-layer formula is fixed. Thus, the outer side surface of the rear longitudinal beam 1 is tightly attached to and fixed with the threshold rear plate 2 in a two-layer manner, the beam assembly is fixed with the rear longitudinal beam 1 in a two-layer manner, the beam assembly extends to the threshold rear plate 2 along the upper part of the rear longitudinal beam 1, at least one first flanging 6 is arranged on the outer side of the beam assembly, the first flanging 6 and the threshold buckle plate are provided with an overlapping part, the first flanging 6 and the threshold rear plate 2 are fixed in a two-layer manner at the corresponding position of the overlapping part, when the side surface of an automobile is collided, side collision force is generated, the side collision force is transmitted to the beam assembly through the threshold rear plate 2, the beam assembly is fixed with the rear longitudinal beam 1 in a two-layer manner, the side collision force is dispersed to the rear longitudinal beam 1 at the fixing position of the beam assembly and the rear longitudinal beam 1, and part of the side collision force is dispersed forwards along the rear longitudinal beam 1, a part of the side impact is dispersed rearward along the rear side member 1, so that the remaining part of the side impact transmitted along the cross member assembly is greatly weakened, thereby protecting the safety of the passengers in the vehicle. And with the rear beam with the form of crossbeam subassembly, make every partial subassembly of rear beam can with threshold back plate 2 the better laminating of back longeron 1, and then be favorable to part stamping forming and improve part material utilization ratio, when preceding floor and back floor height drop are great, guaranteed the rear beam at horizontal continuity. The utility model discloses a rear floor front beam joint structure is, for prior art's advantage: the structure is simple, the assembly size precision is obviously improved, the continuity of the cavity of the rear cross beam is obviously improved, the force transmission path is optimized, and the driving safety of the automobile is improved.

The utility model discloses a joint structure of rear floor front beam please refer to relevant each picture in fig. 1-2, can also be on the basis of preceding technical scheme: the beam component comprises a beam body 5 and a beam extension piece 3, the longitudinal section of the beam body 5 is U-shaped, one end of the beam extension piece 3 is fixed with the end of the beam body 5 in a two-layer mode, a first flanging 6 is arranged at the other end of the beam extension piece 3, and the beam extension piece 3 is fixed with the rear longitudinal beam 1 in a two-layer mode at a corresponding position. Thus, the cross beam assembly is provided with the cross beam body 5 and the cross beam extending pieces 3 fixed at two ends of the cross beam body 5, the cross section of the cross beam body 5 is U-shaped, the cross beam body 5 is connected with the front floor and the rear floor, when the height difference between the front floor and the rear floor is large, the U-shaped structure of the cross beam body 5 can be provided with the U-shaped structure with the height difference, so that one side of the cross beam body 5 is fixed with the front floor in a two-layer manner, the other side of the cross beam body 5 is fixed with the rear floor in a two-layer manner, the problem that the front floor and the rear floor have the difference is solved, the cross beam extending pieces 3 are fixed at two ends of the cross beam body 5, so that the cross beam extending pieces 3 can be better tightly attached to and fixed with the rear longitudinal beam 1 in a two-layer manner, and then the cross beam extending pieces 3 extend to the threshold rear plate 2 above the rear longitudinal beam 1, and finally, the first flanging 6 and the doorsill rear plate 2 are fixed in a two-layer mode, when the side face of an automobile collides, side impact force is generated, the side impact force is transmitted to the fixing position of the cross beam extending piece 3 and the rear longitudinal beam 1 through the doorsill rear plate 2, one part of the side impact force is transmitted forwards along the rear longitudinal beam 1, the other part of the side impact force is transmitted backwards along the rear longitudinal beam 1, the other part of the side impact force is transmitted to the cross beam body 5 along the cross beam extending piece 3, then the cross beam body 5 is sequentially transmitted to the cross beam extending piece 3 on the other side of the cross beam body and the rear longitudinal beam 1 and then is dispersed, in the process, the side impact force is weakened layer by layer, the path of force transmission is optimized, and the effect of safety of passengers. The further preferable technical scheme is that the beam body 5 and the beam extending piece 3 are provided with an overlapping part at the joint, and the beam body 5 and the beam extending piece 3 are fixed in two layers at the corresponding position of the overlapping part. Thus, the overlapping portion of the beam body 5 and the beam extension 3 increases the contact area and the contact thickness of the beam body 5 and the beam extension 3, that is, in the transmission process of the side impact force, when the side impact force is transmitted from the beam extension 3 to the beam body 5, the contact area thickness is increased, that is, the force bearing area is increased, and the unit area load is reduced, so that the beam body 5 and the beam extension 3 are more stable in the force transmission process.

The utility model discloses a joint structure of rear floor front beam please refer to relevant each picture in fig. 1-2, can also be on the basis of preceding technical scheme: the front side and the rear side of the beam extension piece 3 are integrally formed or fixedly provided with the second flanging 7, and the second flanging 7 is fixed with the rear longitudinal beam 1 in a two-layer mode. Therefore, when the U-shaped structure of the cross beam extension piece 3 is reversely buckled on the rear longitudinal beam 1, the side impact force can be transmitted along the U-shaped structure when the side impact force is transmitted to the cross beam extension piece 3 from the threshold rear plate 2, the side impact force applied to the threshold inner plate is transmitted to the cross beam extension piece 3, part of the side impact force is transmitted to the front side and the rear side of the rear longitudinal beam 1 along the second flanging 7, the second flanging 7 is fixed with the rear longitudinal beam 1 in a two-layer mode, the contact area of the cross beam extension piece 3 and the rear longitudinal beam 1 is increased, and the fixed relation of the cross beam extension piece 3 and the rear longitudinal beam 1 is further fastened. According to a further preferable technical scheme, the cross section of the rear longitudinal beam 1 is U-shaped, a third flanging 8 is integrally formed or fixedly arranged on the inner side of the rear longitudinal beam, the second flanging 7 extends transversely along the rear longitudinal beam 1 and is overlapped with the third flanging 8, and the second flanging 7 and the third flanging 8 are fixed in a two-layer mode at the corresponding position of the overlapped part. In this way, the two-layer fixing of the second flange 7 and the third flange 8 widens the contact area between the beam extension 3 and the rear longitudinal beam 1, thereby increasing the fastening of the fixing point of the beam extension and the rear longitudinal beam 1 and the continuity of force transmission.

The utility model discloses a joint structure of rear floor front beam please refer to relevant each picture in fig. 1-2, can also be on the basis of preceding technical scheme: the three first flanges 6 are respectively arranged on the front side, the upper side and the rear side of the outer end of the beam extension piece 3 and respectively extend forwards, upwards and backwards. Thus, the three first flanges 6 are respectively arranged on three surfaces of the U-shaped structure of the beam extension piece 3, when the side surface of the automobile collides, the side collision force is transmitted to the three surfaces of the beam extension piece 3 along the first flanges 6, namely, the transmission path of the side collision force is increased, and the three first flanges 6 increase the contact area between the beam extension piece 3 and the doorsill rear plate 2, so that the side collision force is transmitted to the beam extension piece 3 more dispersedly.

The utility model discloses a joint structure of rear floor front beam please refer to relevant each picture in fig. 1-2, can also be on the basis of preceding technical scheme: the beam assembly comprises a beam connecting piece 4, the transverse section of the beam connecting piece 4 is an A-shaped plate body, the rear side part of the beam connecting piece 4 is fixed with the rear longitudinal beam 1 in a two-layer mode, the front outer side of the beam connecting piece 4 is fixed with the beam extending piece 3 in a two-layer mode, and the front inner side of the beam connecting piece 4 is fixed with the beam body 5 in a two-layer mode. Thus, the transverse section of the cross beam connecting piece 4 is an A-shaped plate body, the front side of the cross beam connecting piece 4 is fixed with the cross beam extending piece 3 in a two-layer mode, the rear side of the cross beam connecting piece 4 is fixed with the rear longitudinal beam 1 in a two-layer mode, the side face of the cross beam extending piece 3 is lapped with the rear longitudinal beam 1 by the cross beam connecting piece 4, the cross beam connecting piece 4 is transversely clamped between the cross beam extending piece 3 and the rear longitudinal beam 1, the angle of the A-shaped top end of the cross beam connecting piece 4 just accords with the included angle of the cross beam extending piece 3 and the rear longitudinal beam 1, the contact area of the cross beam extending piece 3 and the rear longitudinal beam 1 is further increased, and when side impact force is transmitted to the cross beam extending piece 3 from the doorsill rear plate 2 and then is dispersed from the cross beam extending piece 3 to the front side and the rear side of the rear longitudinal beam, the stress area of force transmission is increased, and further, when side impact force is dispersed from the cross beam extension piece 3 to the rear longitudinal beam 1, the stress of the part of the unit area fixed by the cross beam extension piece 3 and the rear longitudinal beam 1 is reduced, so that the load which can be borne by the part of the unit area fixed by the cross beam extension piece 3 and the rear longitudinal beam 1 is increased, and the cross beam extension piece 3 and the rear longitudinal beam 1 are connected and tightly attached. A further preferred technical solution is that a first extension portion 9 is integrally formed or fixedly arranged on a rear side portion of the cross beam connecting member 4, the first extension portion 9 extends from the rear side portion of the cross beam connecting member 4 along the rear longitudinal beam 1, the first extension portion 9 and the rear longitudinal beam 1 have an overlapping portion, and the first extension portion 9 and the rear longitudinal beam 1 are fixed in a two-layer manner at a position corresponding to the overlapping portion. Like this, first extension 9 has enlarged crossbeam connecting piece 4 with the area of contact of back longeron 1 makes crossbeam connecting piece 4 with back longeron 1 is laminated more, like this, has increased crossbeam connecting piece 4 with the thickness of fixed part between the back longeron 1 is more firm like this in power transmission process, and the side impact power is more dispersed in the transmission process, and then has reduced the deformation of back longeron 1 when the automobile takes place the side impact, and then promotes the inside passenger's of automobile security. A further preferable technical solution is that the first extension part 9 and the third flange 8 have an overlapping portion, and the first extension part 9 and the third flange 8 are fixed in two layers at the corresponding position of the overlapping portion. Therefore, the contact area between the cross beam connecting piece 4 and the rear longitudinal beam 1 is further enlarged by the first extending portion 9, so that the cross beam connecting piece 4 is more attached to the rear longitudinal beam 1, the thickness of a fixing portion between the cross beam connecting piece 4 and the rear longitudinal beam 1 is increased, the fixing portion is more stable in the force transmission process, the side impact force is dispersed along the cross beam connecting piece 4 in the transmission process, the dispersed force is dispersed in the direction, the X-direction force and the Y-direction force are opposite in direction and offset a part, the deformation of the rear longitudinal beam 1 in the side impact of the automobile is reduced, and the safety of passengers in the automobile is improved.

The utility model discloses a joint structure of rear floor front beam please refer to relevant each picture in fig. 1-2, can also be on the basis of preceding technical scheme: the front part of the beam connecting piece 4 is integrally formed or fixedly provided with a second extending part 10, the second extending part 10 extends from the front side part of the beam connecting piece 4 along the beam extending piece 3, the second extending part 10 and the beam extending piece 3 have an overlapping part, and the second extending part 10 and the beam extending piece 3 are fixed in a two-layer mode at the corresponding position of the overlapping part. Like this, second extension 10 has enlarged crossbeam connecting piece 4 with the area of contact of crossbeam extension 3 makes crossbeam connecting piece 4 with crossbeam extension 3 is laminated more, like this, has increased crossbeam connecting piece 4 with the thickness of fixed part between the crossbeam extension 3 is more firm like this in power transmission process, and the offset force is more dispersed in the transmission process, and then has reduced the deformation of crossbeam extension 3 when the automobile takes place the offset, and then promotes the inside passenger's of automobile security. A further preferable technical solution is that the second extension part 10 and the second flange 7 have an overlapping portion, and the second extension part 10 and the second flange 7 are fixed in a two-layer manner at a position corresponding to the overlapping portion. Thus, the second extension portion 10 further enlarges the contact area between the beam connecting piece 4 and the beam extension piece 3, so that the beam connecting piece 4 is more attached to the beam extension piece 3, the thickness of the fixed part between the beam connecting piece 4 and the beam extension piece 3 is increased, the force transmission process is more stable, the side impact force is more dispersed along the beam connecting piece 4 in the transmission process, the dispersed force is dispersed along the direction, and the force decomposed to the X direction and the Y direction is opposite to offset one part, so that the deformation of the beam extension piece 3 in the side impact of the automobile is reduced, and the safety of passengers in the automobile is improved. A further preferable technical solution is that the second extending portion 10 and the beam body 5 have an overlapping portion, and the second extending portion 10 and the beam body 5 are fixed in two layers at a position corresponding to the overlapping portion. Thus, the beam connector 4 is longer than the beam extension 3 as long as the beam connector 4 does not interfere with other automobile parts such as the rear floor. When the length of the beam connector 4 is longer than that of the beam extension 3, the second extension 10 may overlap with the beam body 5, and at this time, the first extension 9 and the beam body 5 may be fixed in a two-layer manner, because the first extension 9 further extends to the joint between the beam extension 3 and the beam body 5, and further the beam connector 4 further reinforces the connection between the beam extension 3 and the beam body 5. According to a further preferable technical scheme, fourth flanges 11 are further arranged on two sides of the beam body 5, an overlapping portion is formed between the second extending portion 10 and the fourth flanges 11, and the second extending portion 10 and the fourth flanges 11 are fixed in a two-layer mode at positions corresponding to the overlapping portion. Thus, the second extending part 10 and the fourth flanging 11 are fixed in a two-layer manner, so that the contact area between the beam connecting piece 4 and the beam body 5 is increased, the thickness of the fourth flanging 11 is increased, and the stability of the beam body 5 is further improved.

The above description is only for the description of several embodiments of the present invention, but the scope of the present invention should not be considered as falling within the scope of the present invention, in which all the equivalent changes or modifications or the equal-scale enlargement or reduction etc. according to the design spirit of the present invention are made.

Claims (10)

1. The utility model provides a rear floor front beam joint design which characterized in that: including beam assembly, back longeron and threshold back plate, back longeron with the threshold back plate has the overlap portion in the department that corresponds the position, back longeron with the threshold back plate corresponds the position department two-layer type at the overlap portion and fixes, beam assembly's both ends respectively with front and back both sides back longeron overlap joint, beam assembly with back longeron is fixed at the lapped two-layer type that corresponds the position department, both ends extend to about beam assembly the threshold back plate, beam assembly's outside integrated into one piece or fixed at least one first turn-ups that is provided with, first turn-ups with the threshold back plate two-layer type is fixed.

2. A rear floor front cross member joint structure according to claim 1, wherein: the beam assembly comprises a beam body and a beam extension piece, the longitudinal section of the beam body is U-shaped, one end of the beam extension piece is fixed with the end part of the beam body in a two-layer mode, the first flanging is arranged at the other end of the beam extension piece, and the beam extension piece is fixed with the rear longitudinal beam in a two-layer mode at a corresponding position.

3. A rear floor front cross member joint structure according to claim 2, wherein: the beam body and the beam extending piece are connected through an overlapping portion, and the beam body and the beam extending piece are fixed in a two-layer mode at the corresponding position of the overlapping portion.

4. A rear floor front cross member joint structure according to claim 2, wherein: the front side and the rear side of the beam extension piece are integrally formed or fixedly provided with second flanges, and the second flanges are fixed with the rear longitudinal beam in a two-layer mode.

5. A rear floor front cross member joint structure according to claim 4, wherein: the cross section of the rear longitudinal beam is U-shaped, a third flanging is integrally formed or fixedly arranged on the inner side of the rear longitudinal beam, the second flanging transversely extends along the rear longitudinal beam and is overlapped with the third flanging, and the second flanging and the third flanging are fixed in a two-layer mode at the corresponding positions of the overlapped parts.

6. A rear floor front cross member joint structure according to any one of claims 2 to 5, wherein: the three first flanges are respectively arranged on the front side, the upper side and the rear side of the outer end of the beam extension piece and respectively extend forwards, upwards and backwards.

7. A rear floor front cross member joint structure according to any one of claims 2 to 5, wherein: the beam assembly comprises a beam connecting piece, the transverse section of the beam connecting piece is an A-shaped plate body, the rear side part of the beam connecting piece is fixed with the rear longitudinal beam in a two-layer mode, the front outer side of the beam connecting piece is fixed with the beam extending piece in a two-layer mode, and the front inner side of the beam connecting piece is fixed with the beam body in a two-layer mode.

8. A rear floor front cross rail joint structure according to claim 7, wherein: the rear side part of the cross beam connecting piece is integrally formed or fixedly provided with a first extending part, the first extending part extends from the rear side part of the cross beam connecting piece along the rear longitudinal beam, the first extending part and the rear longitudinal beam are provided with an overlapping part, and the first extending part and the rear longitudinal beam are fixed in a two-layer mode at the corresponding position of the overlapping part.

9. A rear floor front cross rail joint structure according to claim 7, wherein: the front part of the beam connecting piece is integrally formed or fixedly provided with a second extending part, the second extending part extends from the front side part of the beam connecting piece along the beam extending piece, the second extending part and the beam extending piece are provided with an overlapping part, and the second extending part and the beam extending piece are fixed in a two-layer mode at the corresponding position of the overlapping part.

10. A rear floor front cross rail joint structure according to claim 9, wherein: the second extension part and the beam body are provided with an overlapping part, and the second extension part and the beam body are fixed in a two-layer mode at the position corresponding to the overlapping part.

Images