Rear floor cross beam and rear wheel bulge connecting structure and automobile

Abstract

This invention relates to the field of automotive body-in-white technology, specifically to a connection structure between a rear floor crossbeam and a rear wheel hump, and an automobile. The structure includes a rear floor and a rear wheel hump located on the outer side of the rear floor. A rear floor crossbeam is provided on the rear floor, and one end of a connector is connected to the rear floor crossbeam. The connector includes a connector body with a first groove, the surface of which is flush with the connector body. The rear wheel hump has a first boss that mates with the first groove, and the surface of the first boss near the first groove is welded to the surface of the first groove near the first boss. This invention uses the first groove of the connector as a reinforcing member, further connecting it to the first boss of the rear wheel hump, optimizing the connection relationship, reducing production costs, simplifying assembly, and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of automotive body-in-white technology, specifically to a connection structure between a rear floor crossbeam and a rear wheel hump, and an automobile. Background Technology

[0002] In existing car structures, the rear wheel bulge is welded to the car body as an independent component. Its main function is to isolate the rear wheel from the car body and prevent water from entering the car during driving.

[0003] The rear floor crossbeam is connected to the rear wheel hump via a connector. A reinforcing member is installed between the connector and the rear wheel hump to enhance their strength. The reinforcing member is connected to the connector via bolts or plug welding. However, adding a reinforcing member involves first connecting it to the connector, and then connecting the rear wheel hump to the reinforcing member, resulting in secondary assembly, which affects production efficiency and is not conducive to cost reduction. Furthermore, bolted connections require high precision and additional consumables such as welding nuts and connecting bolts. Plug welding, on the other hand, increases dust and light pollution in the production area, which is detrimental to the environment and the health of operators. Additionally, plug welding requires more time and has lower production efficiency. Summary of the Invention

[0004] One objective of this invention is to provide a connection structure between the rear floor crossbeam and the rear wheel hump, so as to solve the problem of connecting the rear floor crossbeam and the rear wheel hump; another objective is to provide an automobile.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A rear floor crossbeam and rear wheel hump connection structure includes a rear floor and a rear wheel hump located on the outer side of the rear floor. A rear floor crossbeam is provided on the rear floor, and one end of a connector is connected to the rear floor crossbeam. The connector includes a connector body, the connector body having a first groove, the platform of the first groove being flush with the connector body; the rear wheel hump having a first boss that mates with the first groove, the surface of the first boss near the first groove being welded to the surface of the first groove near the first boss.

[0007] Based on the aforementioned technical means, the first groove of the connector serves as a reinforcing member, eliminating the need for additional reinforcing members between the rear wheel bulge and the connector. Furthermore, the lower surface of the first groove connects to the upper surface of the first boss on the rear wheel bulge, increasing the connection strength between the connector and the rear wheel bulge. This eliminates the material and labor costs associated with reinforcing members and bolt connections, optimizes the connection relationship, reduces production costs, and improves production efficiency. The first groove and the first boss are welded correspondingly, and the groove serves as the connection positioning reference between the connector and the rear wheel bulge, reducing alignment difficulty and saving workers' operation time.

[0008] Further, the connecting member includes a first connecting portion and a second connecting portion. The first connecting portion is provided with a first sub-groove, and the second connecting portion is provided with a second sub-groove. The first sub-groove and the second sub-groove form a first groove. The cross-section of the connecting member body at the first edge and the second edge is in a "Ji" shape; the first edge is the edge of the first connecting portion close to the second connecting portion, and the second edge is the edge of the second connecting portion close to the first connecting portion.

[0009] According to the above technical means, the cross-section of the connecting body of the first connecting portion and the second connecting portion is in a "Ji" shape. The two "Ji" shapes can serve as reinforcing members, having the advantage of high structural strength; and the connecting member is divided into two parts and can be manufactured separately to reduce the waste rate of production.

[0010] Further, the surface of the first sub-groove close to the first boss is welded to the surface of the first boss close to the first sub-groove, and the surface of the second sub-groove close to the first boss is welded to the surface of the first boss close to the second sub-groove.

[0011] According to the above technical means, the first boss is connected to both the first sub-groove and the second sub-groove, connecting the first connecting portion, the second connecting portion and the rear wheel bulge pairwise, further improving the connection strength between the rear wheel bulge and the connecting member.

[0012] Further, the bottom width of the first sub-groove is greater than the bottom width of the second sub-groove, and the second sub-groove overlaps the first sub-groove. The lower surface of the overlapping part of the first sub-groove and the second sub-groove is connected to the first boss. Or, the bottom width of the first sub-groove is less than the bottom width of the second sub-groove, and the first sub-groove overlaps the second sub-groove. The lower surface of the overlapping part of the first sub-groove and the second sub-groove is connected to the first boss.

[0013] According to the above technical means, the first sub-groove and the second sub-groove overlap each other, and the overlapping part further serves as a reinforcing member. The overlapping part of the two grooves and the rear wheel bulge form a three-layer overlapping structure, enhancing the strength of the connection structure. The first boss is correspondingly connected to the overlapping part, increasing the connection area between the rear wheel bulge and the connecting member, and further strengthening the connection strength between the rear wheel bulge and the connecting member.

[0014] Further, there is an interval between the connecting member body of the first connecting portion and the connecting member body of the second connecting portion, and the interval is at least 3 mm.

[0015] According to the above technical means, there is a gap between the connector body of the first connecting part and the connector body of the second connecting part, and they are not tightly attached together. The connector bodies of the first connecting part are located on both sides of the first groove, and the connector bodies of the second connecting part are located on both sides of the second groove. After the first groove and the second groove overlap, there is a gap between the connector bodies on both sides to prevent the connector bodies from sticking together. In this way, no abnormal noise will be generated between the contacting connector bodies.

[0016] Furthermore, the connector extends along the direction of extension of the rear floor beam.

[0017] Based on the above technical means, the chassis force is transmitted to the rear wheel hub connector through the rear floor crossbeam, and then sequentially to the upper body, which is more conducive to the transmission and dispersion of force.

[0018] Furthermore, the connector is a one-piece molded structure.

[0019] Based on the above-mentioned technical means, the one-piece molding structure is simple to manufacture.

[0020] Furthermore, the connector body is also provided with a second groove, the surface of the second groove being flush with the connector body; the rear floor beam is provided with a second boss that mates with the second groove, the surface of the second boss near the second groove being connected to the surface of the second groove near the second boss.

[0021] Based on the aforementioned technical means, the second groove also serves as a reinforcing element, improving the connection strength between the rear floor beam and the connector.

[0022] Furthermore, the connector also includes sidewalls, which are disposed opposite to each other on both sides of the connector body. The outer edges of the sidewalls are provided with connector flanges, the portion of the connector flange corresponding to the rear wheel hump is connected to the rear wheel hump, and the portion of the connector flange corresponding to the rear floor crossbeam is connected to the rear floor crossbeam.

[0023] Based on the above technical means, the connection strength between the rear wheel bulge and the connecting parts and between the rear floor crossbeam and the connecting parts is strengthened.

[0024] An automobile includes the aforementioned rear floor crossbeam and rear wheel hump connection structure.

[0025] The beneficial effects of this invention are:

[0026] (1) The present invention increases the connection strength between the connector and the rear wheel bulge;

[0027] (2) In this invention, no additional reinforcing member is required between the rear wheel bulge and the connecting member. The connecting member and the rear wheel bulge are welded together, which saves the material and labor costs of reinforcing ribs and bolt connections, reduces production costs and improves production efficiency.

[0028] (3) Using the first groove as the connection positioning reference between the connector and the rear wheel bulge reduces the difficulty of alignment, saves workers' operation time, and further improves production efficiency. Attached Figure Description

[0029] Figure 1 A partial structural diagram of a connection structure between a rear floor crossbeam and a rear wheel hump, provided for some embodiments;

[0030] Figure 2 A partial structural diagram of another rear floor crossbeam and rear wheel hump connection structure provided in some embodiments;

[0031] Figure 3 A structural diagram of a connection structure between a rear floor crossbeam and a rear wheel hump provided for an embodiment of this disclosure;

[0032] Figure 4 An exploded view of a connection structure between a rear floor crossbeam and a rear wheel bulge, provided for an embodiment of this disclosure;

[0033] Figure 5 A cross-section of a first edge is provided for embodiments of this disclosure;

[0034] Figure 6 for Figure 3 A cross-sectional view along section lines A1-A2;

[0035] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0036] Figure 8 for Figure 6 Enlarged view at point B in the middle;

[0037] Figure 9 for Figure 6 Enlarged view of point C in the middle.

[0038] Wherein: 1, 1A, 1B - rear wheel bulge; 11 - first boss; 12 - first area; 13 - second area; 2, 2A, 2B - connector; 21 - first connecting part; 211 - first sub-groove; 212 - first flange; 213 - second flange; 214 - first edge; 22 - second connecting part; 221 - second sub-groove; 222 - third flange; 223 - fourth flange; 224 - second edge; 23 - connector body; 24 - side wall; 3A, 3B - reinforcement; 4 - filler used for plug welding; 5 - screw hole; 6 - bolt; 7 - spacer; 8 - first groove. Detailed Implementation

[0039] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0040] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0041] Figure 1 A partial structural diagram of a connection structure between a rear floor crossbeam and a rear wheel hump, provided for some embodiments.

[0042] In related technologies, see Figure 1 The upper section of connector 2A is bolted to reinforcing member 3A, and the lower section of connector 2A is connected to the rear floor crossbeam (not shown in the figure). The rear wheel hump 1A is connected to reinforcing member 3A. Reinforcing member 3A serves to strengthen the connection between connector 2A and rear wheel hump 1A. This method involves secondary assembly and requires the addition of reinforcing member 3A, which is not conducive to simplifying the connection between rear wheel hump 1A and connector 2A. The upper section of connector 2A has a screw hole 5, and the reinforcing member 3A also has a screw hole at the corresponding position. Bolt 6 passes through the screw hole 5 of connector 2A and the screw hole of reinforcing member 3A to connect the upper section of connector 2A to reinforcing member 3A. The welding nuts and bolts 6 used for connection are consumables, and the more they are used, the higher the cost. The screw hole of the reinforcing member 3A and the screw hole 5 of the connecting member 2A need to be aligned, and the bolt 6 also needs to be aligned and inserted into the screw hole. The bolt connection has high precision requirements for the screw hole 5 and the screw hole of the reinforcing member 3A. Problems such as misaligned holes are prone to occur during the production process, which affects production efficiency. More manpower and time are invested in improving the precision of parts (such as screw holes, welding nuts and bolts), which is not conducive to improving production efficiency and reducing costs.

[0043] Figure 2 A partial structural diagram of another rear floor crossbeam and rear wheel hump connection structure provided for some embodiments.

[0044] In related technologies, see Figure 2The upper section of connector 2B is connected to reinforcing member 3B by plug welding, and the lower section of connector 2B is connected to the rear floor crossbeam (not shown in the figure). The rear wheel bulge 1B is connected to reinforcing member 3B. Similar to the above embodiments, this is a secondary assembly. However, plug welding is used, and the filler 4 used in plug welding is also a consumable. During use, the burning of the filler will generate dust, arc light, and noise pollution, which will increase dust and light pollution in the production area. Inhaling the dust can cause certain damage to the lungs. The ultraviolet rays and sparks generated by plug welding can burn the skin and eyes if not properly protected. The noise generated is also relatively loud, which can cause tinnitus and other hazards, which are detrimental to the environment and the health of operators. At the same time, plug welding operation takes a long time and has low production efficiency.

[0045] To address the aforementioned problems, embodiments of this disclosure provide an automobile including a rear floor crossbeam and a rear wheel hump connection structure.

[0046] Figure 3 This is a structural diagram of a connection structure between a rear floor crossbeam and a rear wheel hump, provided as an embodiment of the present disclosure. Figure 4 An exploded view of a connection structure between a rear floor crossbeam and a rear wheel bulge, provided for an embodiment of this disclosure. Figure 5 A cross-section of a first edge is provided for an embodiment of this disclosure.

[0047] See Figure 3 and Figure 4 The rear floor crossbeam and rear wheel hump connection structure includes a rear floor (not shown in the figure) and a rear wheel hump 1 located on the outer side of the rear floor. A rear floor crossbeam (not shown in the figure) is provided on the rear floor. One end of a connector 2 is connected to the rear wheel hump, and the other end is connected to the rear floor crossbeam. The connector 2 includes a connector body 23, which has a first groove 8. The platform of the first groove 8 is flush with the connector body 23. The first groove 8 can be located in the middle of the connector body 23, with its sidewalls encircling the bottom of the first groove 8. Alternatively, the first groove 8 can be located at the edge of the connector body 23. The first groove 8 is an open groove, with its sidewalls not encircling the bottom of the first groove 8, leaving a notch. The bottom shape of the first groove 8 can be any of a semi-circle, a circle, or a polygon, or other shapes; the embodiments disclosed herein do not limit this. The rear wheel hump 1 has a first boss 11 that mates with the first groove 8. The lower surface of the first groove 8 overlaps with the upper surface of the first boss 11 in the orthographic projection of the plane containing the upper surface of the first boss 11. The upper surface of the first boss 11 (i.e., the surface of the first boss 11 near the first groove 8) is welded to the lower surface of the first groove 8 (i.e., the surface of the first groove 8 near the first boss 11). The welding can be spot welding or full-surface welding of the overlapping part.

[0048] In the embodiments of this disclosure, the connector 2 is directly connected to the rear wheel hump 1 and the rear floor crossbeam, respectively, without the need to first connect to the reinforcing member and then to the rear wheel hump, eliminating the need for secondary assembly and optimizing the connection relationship. The lower surface of the first groove 8 is connected to the first boss 11, using the first groove 8 as a reinforcing member, that is, a part of the connector 2 as a reinforcing member, eliminating the need for additional reinforcing members and saving on material costs. The first groove 8 is welded to the first boss 11, further increasing the connection strength between the connector 2 and the rear wheel hump 1, and direct welding saves on the consumables used for bolt connections and plug welding connections, reducing costs. The first groove 8 can also serve as a reference position for the connection between the connector 2 and the rear wheel hump 1, reducing the difficulty of connecting the connector 2 and the rear wheel hump 1 in the manufacturing process and improving production efficiency.

[0049] In some embodiments, see continue to see Figure 3 Connector 2 extends along the extension direction of the rear floor crossbeam. Connector 2 extends from the rear wheel hump 1 to the rear floor crossbeam. The chassis force is transmitted through the rear floor crossbeam to connector 2 on the rear wheel hump 1, and then to the upper body, which is beneficial for the transmission and distribution of force.

[0050] In some embodiments, see continue to see Figure 4 and Figure 5 The connector 2 includes a first connecting portion 21 and a second connecting portion 22 along its extending direction. The first connecting portion 21 has a first sub-groove 211, and the second connecting portion 22 has a second sub-groove 221, which together form a first groove 8. The connector body 23 has a U-shaped cross-section at the edge of the first connecting portion 21 near the second connecting portion 22 (hereinafter referred to as the first edge 214). One end of the sidewall 24 of the first sub-groove 211 is connected to the connector body 23, and the other end is connected to the bottom of the first sub-groove 211. The line connecting the two ends of the sidewall 24 can be perpendicular to or inclined to the connector body 23. The connector body 23 has a U-shaped cross-section at the edge of the second connecting portion 22 near the first connecting portion 21 (hereinafter referred to as the second edge 224). The specific structure can be referred to the structure of the first edge 214, and will not be repeated here.

[0051] This embodiment uses two "U"-shaped cross-sections as reinforcing members, resulting in high structural strength. The connector 2 is divided into two parts (first connecting part 21 and second connecting part 22), and these two parts are manufactured separately to reduce the scrap rate during production.

[0052] In some embodiments, the connector 2 further includes sidewalls, which are disposed opposite to each other on both sides of the connector body 23. The outer edges of the sidewalls are provided with connector flanges to increase structural strength. The portion of the connector flange corresponding to the rear wheel hump 1 is connected to the rear wheel hump 1, and the portion of the connector flange corresponding to the rear floor crossbeam is connected to the rear floor crossbeam. Specifically, see [link to documentation]. Figure 4 The first connecting part 21 has two opposing sidewalls on its connecting body 23. One side of the outer edge of each sidewall has a first flange 212, and the other side has a second flange 213. The second connecting part 22 also has two opposing sidewalls on its connecting body 23. One side of the outer edge of each sidewall has a third flange 222, and the other side has a fourth flange 223. The first flange 212 and the third flange 222 are on the same side, as are the third flange 222 and the fourth flange 223. The first flange 212 and the third flange 222 extend along the extension direction of the rear wheel hump 1. The second flange 213 and the fourth flange 223 extend along the extension direction of the rear wheel hump 1. The first connecting part 21 is connected to the rear wheel hump 1 via the first flange 212 and the second flange 213, for example, by welding. The second connecting part 22 is connected to the rear wheel hump 1 and the rear floor crossbeam via the third flange 222 and the fourth flange 223. The flanged connection of the connector strengthens the connection between the rear wheel bulge 1 and the connector 2, as well as between the rear floor crossbeam and the connector 2.

[0053] In some embodiments, the lower surface of the first sub-groove 211 is welded to the upper surface of the first boss 11, and the lower surface of the second sub-groove 221 is welded to the upper surface of the first boss 11. The first sub-groove 211 and the second sub-groove 221 are also interconnected. In this embodiment, the first boss 11 is simultaneously connected to both the first sub-groove 211 and the second sub-groove 221. The first connecting part 21, the second connecting part 22, and the rear wheel bulge 1 are connected in pairs, further improving the connection strength between the rear wheel bulge 1 and the connecting member 2.

[0054] Figure 6 for Figure 3 A cross-sectional view along section lines A1-A2. Figure 7 for Figure 6 Enlarged view of point A in the middle. Figure 8 for Figure 6 Enlarged view of section B in the middle. Figure 9 for Figure 6 Enlarged view of point C in the middle.

[0055] In some embodiments, see Figures 6-9The bottom width of the first sub-groove 211 is greater than the bottom width of the second sub-groove 221. The second sub-groove 221 overlaps the first sub-groove 211, and the lower surface of the overlapping portion of the first sub-groove 211 and the second sub-groove 221 is connected to the first boss 11. Alternatively, the bottom width of the first sub-groove 211 is less than the bottom width of the second sub-groove 221, and the first sub-groove 211 overlaps the second sub-groove 221. The lower surface of the overlapping portion of the first sub-groove 211 and the second sub-groove 221 is connected to the first boss 11. Specifically, taking the second sub-groove 221 overlapping the first sub-groove 211 as an example, the first boss 11 forms a three-layer overlapping structure with the first sub-groove 211 and the second sub-groove 221 in sequence. The area of ​​the rear wheel bulge 1 corresponding to the first flange 212 and the third flange 222 is the first area 12, and the area of ​​the rear wheel bulge 1 corresponding to the second flange 213 and the fourth flange 223 is the second area 13. A three-layer overlapping structure is formed sequentially between the first region 12, the first flange 212, and the third flange 222. A three-layer overlapping structure is also formed sequentially between the second region 13, the second flange 213, and the fourth flange 223. More specifically, taking the first sub-groove 211 overlapping the second sub-groove 221 as an example, the order of the three-layer overlapping structure formed in the above embodiment changes. A three-layer overlapping structure is formed sequentially between the first boss 11 and the second sub-groove 221, and between the first sub-groove 211. A three-layer overlapping structure is formed sequentially between the first region 12, the third flange 222, and the first flange 212. A three-layer overlapping structure is formed sequentially between the second region 13, the fourth flange 223, and the second flange 213. This multi-layer overlapping structure enhances the connection strength of the connecting structure. Furthermore, the overlapping structure further acts as a reinforcing member, strengthening the connection strength of the connector 2.

[0056] In some embodiments, see continue to see Figure 6 The connector body of the first connecting part 21 and the connector body of the second connecting part 22 are spaced apart, with a gap 7 of at least 3mm, such as 3mm, 5mm, or 8mm. Specifically, there is a gap 7 in the non-connecting areas of the first connecting part 21 and the second connecting part 22, so that the first connecting part 21 and the second connecting part 22 are not tightly attached to each other, the sidewalls can contact each other, and the bottom is left with a gap 7 to prevent the surfaces of the first connecting part 21 and the second connecting part 22 from rubbing against each other and reduce the risk of abnormal noise.

[0057] In some embodiments, the connector 2 is a one-piece molded structure. For example, the connector 2 is a one-piece molded structure made by sheet metal stamping, which only requires the manufacture of one mold, simplifies the process, and ensures the overall structural strength.

[0058] In some embodiments, the connector 2 may also be provided with multiple grooves, and the rear wheel hump 1 may be provided with multiple corresponding bosses, and the rear floor crossbeam may be provided with multiple corresponding bosses. Specifically, in addition to the first groove 8, the connector body 23 is also provided with multiple second grooves, the surfaces of which are flush with the connector body 23. The second grooves may correspond to the bosses provided on the rear wheel hump 1, and the lower surface of the second grooves is connected to the upper surface of the bosses. The rear floor crossbeam is provided with second bosses, and the second grooves may correspond to the second bosses. The lower surface of the second grooves is connected to the upper surface of the second bosses. That is, the grooves and bosses are provided at the corresponding positions on the rear wheel hump 1 or on the corresponding positions on the rear floor crossbeam. The multiple grooves and multiple bosses together serve as reinforcing members, improving the connection strength between the rear wheel hump 1, the rear floor crossbeam, and the connector 2.

[0059] This invention uses the groove of the connector as a reinforcing member, and further connects it with the boss of the rear wheel bulge through the groove, thereby optimizing the connection relationship, reducing production costs, reducing assembly difficulty, and improving production efficiency.

[0060] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A connection structure between a rear floor crossbeam and a rear wheel hump, comprising a rear floor and a rear wheel hump located outside the rear floor, wherein a rear floor crossbeam is provided on the rear floor, and one end of a connector is connected to the rear floor crossbeam; the connector comprises a connector body; characterized in that, The connector body is provided with a first groove, and the platform of the first groove is flush with the connector body; the rear wheel bulge is provided with a first boss that mates with the first groove, and the surface of the first boss near the first groove is welded to the surface of the first groove near the first boss. The connector includes a first connecting portion and a second connecting portion. The first connecting portion has a first sub-groove, and the second connecting portion has a second sub-groove. The first sub-groove and the second sub-groove form the first groove. The surface of the first sub-groove near the first boss is welded to the surface of the first boss near the first sub-groove, and the surface of the second sub-groove near the first boss is welded to the surface of the first boss near the second sub-groove. The first sub-groove and the second groove are connected to form a three-layer overlapping structure, and the connector body of the first connecting portion and the connector body of the second connecting portion are spaced apart. The first connecting part has two opposite sidewalls on its two sides. The outer edges of the two sidewalls of the first connecting part are respectively provided with a first flange and a second flange. The first flange and the second flange are used to connect with the rear wheel hump. The second connecting part has two opposite sidewalls on its two sides. The outer edges of the two sidewalls of the second connecting part are respectively provided with a third flange and a fourth flange. The third flange and the fourth flange are both used to connect with the rear wheel hump and the rear floor crossbeam.

2. The connection structure between the rear floor crossbeam and the rear wheel hump according to claim 1, characterized in that, The connector includes a first connecting portion and a second connecting portion. The first connecting portion has a first sub-groove, and the second connecting portion has a second sub-groove. The first sub-groove and the second sub-groove form the first groove. The connector body has a cross-section of a first edge and a second edge that is "U"-shaped. The first edge is the edge of the first connecting portion near the second connecting portion, and the second edge is the edge of the second connecting portion near the first connecting portion.

3. The connection structure between the rear floor crossbeam and the rear wheel hump according to claim 2, characterized in that, The surface of the first sub-groove near the first boss is welded to the surface of the first boss near the first sub-groove, and the surface of the second sub-groove near the first boss is welded to the surface of the first boss near the second sub-groove.

4. The connection structure between the rear floor crossbeam and the rear wheel hump according to claim 2, characterized in that, The bottom width of the first sub-groove is greater than the bottom width of the second sub-groove. The second sub-groove overlaps the first sub-groove. The lower surface of the overlapping portion of the first and second sub-grooves is connected to the first boss. or, The bottom width of the first sub-groove is smaller than the bottom width of the second sub-groove. The first sub-groove overlaps the second sub-groove, and the lower surface of the overlapping portion of the first and second sub-groos is connected to the first boss.

5. The connection structure between the rear floor crossbeam and the rear wheel hump according to claim 4, characterized in that, The connector body of the first connecting part and the connector body of the second connecting part are spaced apart, and the space is at least 3mm.

6. The connection structure between the rear floor crossbeam and the rear wheel hump according to claim 1, characterized in that, The connector extends along the extension direction of the rear floor beam.

7. The connection structure between the rear floor crossbeam and the rear wheel hump according to claim 1, characterized in that, The connector is a one-piece molded structure.

8. The connection structure between the rear floor crossbeam and the rear wheel hump according to claim 1, characterized in that, The connector body is also provided with a second groove, the platform of the second groove being flush with the connector body; the rear floor beam is provided with a second boss that mates with the second groove, the surface of the second boss near the second groove being connected to the surface of the second groove near the second boss.

9. The connection structure between the rear floor crossbeam and the rear wheel hump according to claim 1, characterized in that, The connector also includes sidewalls, which are disposed opposite to each other on both sides of the connector body; each sidewall has a connector flange on its outer edge, the portion of the connector flange corresponding to the rear wheel hump is connected to the rear wheel hump, and the portion of the connector flange corresponding to the rear floor crossbeam is connected to the rear floor crossbeam.

10. A car, characterized in that, Includes the rear floor crossbeam and rear wheel hump connection structure as described in any one of claims 1-9.

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