Automobile rear floor boundary beam assembly and automobile

Abstract

The utility model relates to an automobile rear floor boundary beam assembly and an automobile, the overall structure is large in the middle and small in two ends, and the automobile rear floor boundary beam assembly comprises a rear floor boundary beam rear section, a rear shock absorber buffer bracket mounting plate, a rear shock absorber buffer bracket reinforcing piece, a rear floor boundary beam front section and a rear shock absorber buffer bracket reinforcing plate; the front end part of the rear floor edge beam rear section and the rear end part of the rear floor edge beam front section are fixedly connected together through a rear shock absorber buffer bracket mounting plate, a rear shock absorber buffer bracket reinforcing piece, the rear floor edge beam front section and a rear shock absorber buffer bracket reinforcing plate; and the rear shock absorber buffer bracket mounting plate, the rear shock absorber buffer bracket reinforcing piece and the rear shock absorber buffer bracket reinforcing plate form a rear shock absorber buffer bracket structure. According to the utility model, the section of the cavity can be enlarged to the maximum extent, and meanwhile, the occupation of the chassis space is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile rear floor structures, in particular to an automobile rear floor side beam assembly and an automobile. Background Art

[0002] As SUVs continue to gain market share in China, customers are increasingly demanding comfort and off-road performance from SUVs. At the same time, the range of new energy vehicles is also a focus of customer attention. In order to solve the problems of SUVs' ride comfort and range, household passenger cars mostly use a load-bearing body structure, which inevitably sacrifices some of the SUVs' off-road performance, especially reducing the torsional stiffness of the body. On the other hand, in order to take into account the off-road performance of SUVs, the rear floor side beam cavity design will inevitably be larger than that of conventional models. In order to ensure space for the passenger compartment, it will inevitably occupy the layout space of the chassis.

[0003] For example, patent document CN114715291A discloses a subframe mounting structure and an electric vehicle, wherein the subframe mounting structure comprises a mounting bracket and a connecting bracket connected to the inner side of the rear section of the rear floor side beam, wherein the mounting bracket is also connected to the connecting bracket, wherein the mounting bracket from the upper side, the connecting bracket from the lower side and the rear section of the rear floor side beam from the outer side together form a closed cavity as a mounting point for mounting the subframe, wherein a mounting component is provided through the cavity, and the mounting component is used for mounting the subframe; a reinforcing plate is provided in the cavity to strengthen the mounting point, but this structure still occupies the layout space of the chassis.

[0004] Therefore, it is necessary to develop a new automobile rear floor side beam assembly and automobile. Summary of the invention

[0005] The utility model aims to provide an automobile rear floor side beam assembly and an automobile, which can increase the cavity cross section to the greatest extent and reduce the occupation of the chassis space.

[0006] In the first aspect, the utility model describes a rear floor side beam assembly of an automobile, the overall structure of which is large in the middle and small at both ends, and comprises a rear section of the rear floor side beam, a rear shock absorber buffer bracket mounting plate, a rear shock absorber buffer bracket reinforcement, a front section of the rear floor side beam and a rear shock absorber buffer bracket reinforcement plate; the front end section of the rear section of the rear floor side beam and the rear end section of the front section of the rear floor side beam are fixedly connected together by the rear shock absorber buffer bracket mounting plate, the rear shock absorber buffer bracket reinforcement and the rear shock absorber buffer bracket reinforcement plate, and the rear shock absorber buffer bracket mounting plate, the rear shock absorber buffer bracket reinforcement and the rear shock absorber buffer bracket reinforcement plate form a rear shock absorber buffer bracket structure.

[0007] Optionally, the cross section of the rear section of the rear floor side beam is a U-shape with an opening facing upward, comprising a first bottom surface, and a first side surface and a second side surface respectively located on both sides of the first bottom surface; a first flange is provided on the first side surface, and a second flange is provided on the second side surface. The rear section of the rear floor side beam is U-shaped and has good strength.

[0008] Optionally, a first positioning hole and a second positioning hole are opened on the first bottom surface, wherein the first positioning hole is a main positioning hole of the rear section of the rear floor side beam, and the second positioning hole is a secondary positioning hole of the rear section of the rear floor side beam.

[0009] Optionally, the cross section of the front section of the rear floor side beam is a U-shape with an opening facing upward, comprising a second bottom surface, and a third side surface and a fourth side surface respectively located on both sides of the second bottom surface, and a third flange is provided on the upper side of the third side surface;

[0010] The rear end of the front section of the rear floor side beam is matched and connected with the first bottom surface of the front end of the rear section of the rear floor side beam through the second bottom surface;

[0011] The rear end of the front section of the rear floor side beam is also matched and connected with the first side surface of the rear section of the rear floor side beam through the third side surface;

[0012] The third flange on the rear end of the third side is matched and welded with the first flange at the front end of the rear section of the rear floor side beam. The front section of the rear floor side beam is U-shaped and has good strength.

[0013] Optionally, a third positioning hole and a fourth positioning hole are provided on the second bottom surface, wherein the third positioning hole is a main positioning hole of the front section of the rear floor side beam, and the fourth positioning hole is a secondary positioning hole of the front section of the rear floor side beam.

[0014] Optionally, it further comprises a rear floor side beam middle reinforcement member, wherein the cross section of the rear floor side beam middle reinforcement member is a U-shape with an opening facing upward, and comprises a third bottom surface, and a fifth side surface and a sixth side surface respectively located on both sides of the third bottom surface;

[0015] The rear section of the reinforcement in the rear floor side beam is matched and connected with the first bottom surface of the rear section of the rear floor side beam through the third bottom surface, and the rear section of the reinforcement in the rear floor side beam is also matched and connected with the first side surface of the rear section of the rear floor side beam through the fifth side surface;

[0016] The front section of the reinforcement in the rear floor side beam is matched and connected with the second bottom surface of the front section of the rear floor side beam through the third bottom surface;

[0017] The front section of the reinforcement member in the rear floor side beam is also matched and connected with the third side surface of the front section of the rear floor side beam through the fifth side surface. The reinforcement member in the rear floor side beam is in a "U" shape, which not only plays the role of connecting the front section of the rear floor side beam and the rear section of the rear floor side beam, but also plays a role of reinforcement.

[0018] Optionally, a fifth positioning hole and a sixth positioning hole are provided on the third bottom surface, wherein the fifth positioning hole is a main positioning hole of the reinforcement in the rear floor side beam, and the sixth positioning hole is a secondary positioning hole of the reinforcement in the rear floor side beam.

[0019] Optionally, a seventh positioning hole and an eighth positioning hole are provided on the top surface of the rear shock absorber buffer bracket mounting plate, wherein the seventh positioning hole is the main positioning hole of the rear shock absorber buffer bracket mounting plate, and the eighth positioning hole is the secondary positioning hole of the rear shock absorber buffer bracket mounting plate.

[0020] Optionally, the rear shock absorber buffer bracket reinforcement is U-shaped with an opening toward the rear shock absorber buffer bracket reinforcement plate, the front end and the rear end of the rear shock absorber buffer bracket reinforcement are both provided with a fourth flange, and the lower side of the rear shock absorber buffer bracket reinforcement is provided with a fifth flange;

[0021] The inner side surface of the rear shock absorber buffer bracket reinforcement is matched and connected with the outer side wall of the rear shock absorber buffer bracket mounting plate;

[0022] The rear shock absorber buffer bracket reinforcement is matched and connected with the fourth side surface of the front section of the rear floor side beam and the second flange of the rear section of the rear floor side beam through the fourth flange;

[0023] The fifth flange of the rear shock absorber buffer bracket reinforcement is matched and connected with the first bottom surface of the front end portion of the rear section of the rear floor side beam and the second bottom surface of the rear end portion of the front section of the rear floor side beam respectively;

[0024] The outer side surface of the rear shock absorber buffer bracket reinforcement is matched and connected with the sixth side surface of the reinforcement in the rear floor side beam. The rear shock absorber buffer bracket reinforcement is "U" shaped and can play a good reinforcement role.

[0025] Optionally, a ninth positioning hole and a tenth positioning hole are provided on the fifth flange, wherein the ninth positioning hole is a main positioning hole of the rear shock absorber buffer bracket reinforcement, and the tenth positioning hole is a secondary positioning hole of the rear shock absorber buffer bracket reinforcement.

[0026] Optionally, the front overlap surface of the rear shock absorber buffer bracket reinforcement plate is matched and connected with the fourth side surface of the rear end of the front section of the rear floor side beam and the fourth flange of the front end of the rear shock absorber buffer bracket reinforcement respectively;

[0027] The rear overlap surface of the rear shock absorber buffer bracket reinforcement plate is matched and connected with the second side surface at the front end of the rear section of the rear floor side beam and the fourth flange at the rear end of the rear shock absorber buffer bracket reinforcement;

[0028] The inner surface of the rear shock absorber buffer bracket reinforcement plate is matched and connected with the outer side wall of the rear shock absorber buffer bracket mounting plate, and plays the role of connecting the front section of the rear floor side beam, the rear section of the rear floor side beam and the rear shock absorber buffer bracket mounting plate.

[0029] Optionally, an eleventh positioning hole and a twelfth positioning hole are provided on the rear shock absorber buffer bracket reinforcement plate, wherein the eleventh positioning hole is the main positioning hole of the rear shock absorber buffer bracket reinforcement plate, and the twelfth positioning hole is the secondary positioning hole of the rear shock absorber buffer bracket reinforcement plate.

[0030] In a second aspect, a car according to the utility model adopts the car rear floor side beam assembly according to the utility model.

[0031] Beneficial effects of the utility model: the automobile rear floor side beam assembly described in the utility model is generally "olive-shaped" with a large middle and small ends, which maximizes the cross-section of the cavity. The installation position of the rear shock absorber buffer bracket structure extends to the inner side of the rear floor side beam cavity, thereby realizing the rational use of the internal cavity space of the rear floor side beam and reducing the encroachment on the chassis space. On the other hand, considering the material utilization rate of the rear floor side beam body, the rear floor side beam body adopts a segmented type, that is, it is divided into the front section of the rear floor side beam and the rear section of the rear floor side beam at the installation position of the rear shock absorber buffer bracket structure, and is connected in the middle by the rear shock absorber buffer bracket reinforcement, the rear floor side beam middle reinforcement, and the rear shock absorber buffer bracket reinforcement plate; wherein, the rear floor side beam middle reinforcement is "U"-shaped, which not only plays a connecting role of the front section of the rear floor side beam, the rear section of the rear floor side beam, and the shock absorber buffer bracket reinforcement, but also plays a reinforcing role. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the three-dimensional structure of the rear floor side beam assembly of the automobile in the embodiment of the present application;

[0033] Figure 2 This is a parsing diagram of the rear floor side beam assembly of the vehicle according to an embodiment of the present application;

[0034] Figure 3 This is a schematic structural diagram of the rear section of the rear floor side beam in an embodiment of the present application;

[0035] Figure 4 This is one of the structural schematic diagrams of the reinforcement member in the rear floor side beam in the embodiment of the present application;

[0036] Figure 5 This is the second structural schematic diagram of the reinforcement member in the rear floor side beam in the embodiment of the present application;

[0037] Figure 6 This is a schematic structural diagram of a rear shock absorber buffer bracket mounting plate in an embodiment of the present application;

[0038] Figure 7 This is one of the structural schematic diagrams of the rear shock absorber buffer bracket reinforcement in the embodiment of the present application;

[0039] Figure 8This is the second structural schematic diagram of the rear shock absorber buffer bracket reinforcement member in the embodiment of the present application;

[0040] Fig. 9 This is a schematic structural diagram of the front section of the rear floor side beam in an embodiment of the present application;

[0041] Fig.10 This is a schematic diagram of the structure of the rear shock absorber buffer bracket reinforcement plate in the embodiment of the present application;

[0042] Among them: 1. Rear section of rear floor side beam; 1-11. First positioning hole; 1-12. Second positioning hole; 1-13. First bottom surface; 1-14. First side surface; 1-15. First flange; 1-16. Second flange; 1-17. Second side surface; 2. Reinforcement member in rear floor side beam; 2-11. Fifth positioning hole; 2-12. Sixth positioning hole; 2-13. Third bottom surface; 2-14. Fifth side surface; 2-15. Sixth side surface; 3. Rear shock absorber buffer bracket mounting plate; 3-11. Seventh positioning hole; 3-12. Eighth positioning hole; 3-13. Outer wall; 4. Rear shock absorber buffer bracket Frame reinforcement; 4-11, the ninth positioning hole; 4-12, the tenth positioning hole; 4-13, the inner side; 4-14, the fourth flange; 4-15, the outer side; 4-16, the fifth flange, 5, the front section of the rear floor side beam; 5-11, the third positioning hole; 5-12, the fourth positioning hole; 5-13, the second bottom surface; 5-14, the third side; 5-15, the fourth side; 5-16, the third flange; 6, the rear shock absorber buffer bracket reinforcement plate; 6-11, the eleventh positioning hole; 6-12, the twelfth positioning hole; 6-13, the front lap surface; 6-14, the rear lap surface; 6-15, the inner surface. DETAILED DESCRIPTION

[0043] The following will refer to the accompanying drawings and preferred embodiments to illustrate the implementation of the technical solution of the utility model. Those skilled in the art can easily understand other advantages and effects of the utility model from the contents disclosed in this specification. The utility model can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the utility model. It should be understood that the preferred embodiments are only for illustrating the utility model, not for limiting the scope of protection of the utility model.

[0044] like Figure 1 and Figure 2As shown, in the embodiment of the present application, a rear floor side beam assembly of an automobile has an overall structure that is large in the middle and small at both ends, including a rear section 1 of the rear floor side beam, a rear shock absorber buffer bracket mounting plate 3, a rear shock absorber buffer bracket reinforcement 4, a front section 5 of the rear floor side beam and a rear shock absorber buffer bracket reinforcement plate 6; the front end section 1 of the rear floor side beam rear section and the rear end section 5 of the rear floor side beam front section are fixedly connected together by welding through the rear shock absorber buffer bracket mounting plate 3, the rear shock absorber buffer bracket reinforcement 4 and the rear shock absorber buffer bracket reinforcement plate 6, and the rear shock absorber buffer bracket mounting plate 3, the rear shock absorber buffer bracket reinforcement 4 and the rear shock absorber buffer bracket reinforcement plate 6 form a rear shock absorber buffer bracket structure.

[0045] like Figure 1 and Figure 2 As shown, in a possible embodiment, a rear floor side beam assembly of an automobile further includes a rear floor side beam middle reinforcement 2, and the rear floor side beam middle reinforcement 2 is fixedly connected to the rear section 1 of the rear floor side beam, the rear shock absorber buffer bracket reinforcement 4, and the front section 5 of the rear floor side beam by welding.

[0046] The following describes the mutual overlapping relationship of the various parts.

[0047] like Figure 3 As shown, in a possible embodiment, the cross section of the rear section 1 of the rear floor side beam is a U-shape with the opening facing upward, which includes a first bottom surface 1-13, and a first side surface 1-14 and a second side surface 1-17 respectively located on both sides of the first bottom surface 1-13; a first positioning hole 1-11 and a second positioning hole 1-12 are opened on the first bottom surface 1-13, wherein the first positioning hole 1-11 is the main positioning hole of the rear section 1 of the rear floor side beam, and the second positioning hole 1-12 is the secondary positioning hole of the rear section 1 of the rear floor side beam. A first flange 1-15 is provided on the first side surface 1-14, and a second flange 1-16 is provided on the second side surface 1-17.

[0048] like Figure 4 and Figure 5 As shown, in a possible embodiment, the cross section of the reinforcement member 2 in the rear floor side beam is a U-shape with an opening facing upward, which includes a third bottom surface 2-13, and a fifth side surface 2-14 and a sixth side surface 2-15 respectively located on both sides of the third bottom surface 2-13. A fifth positioning hole 2-11 and a sixth positioning hole 2-12 are provided on the third bottom surface 2-13, wherein the fifth positioning hole 2-11 is a main positioning hole of the reinforcement member 2 in the rear floor side beam, and the sixth positioning hole 2-12 is a secondary positioning hole of the reinforcement member 2 in the rear floor side beam.

[0049] like Figure 1 and Figure 2As shown, in a possible embodiment, the sixth positioning hole 2-12 of the reinforcement member 2 in the rear floor side beam is aligned with the second positioning hole 1-12 of the rear section 1 of the rear floor side beam. The third bottom surface 2-13 of the rear section of the reinforcement member 2 in the rear floor side beam is matched and connected with the first bottom surface 1-13 of the front end of the rear section 1 of the rear floor side beam, and the fifth side surface 2-14 of the rear section of the reinforcement member 2 in the rear floor side beam is matched and connected with the first side surface 1-14 of the front end of the rear section 1 of the rear floor side beam.

[0050] like Figure 6 As shown, in a possible embodiment, a seventh positioning hole 3-11 and an eighth positioning hole 3-12 are provided on the top surface of the rear shock absorber buffer bracket mounting plate 3, wherein the seventh positioning hole 3-11 is the main positioning hole of the rear shock absorber buffer bracket mounting plate 3, and the eighth positioning hole 3-12 is the secondary positioning hole of the rear shock absorber buffer bracket mounting plate 3.

[0051] like Figure 7 and Figure 8 As shown, in a possible embodiment, the rear shock absorber buffer bracket reinforcement 4 is U-shaped with its opening facing the rear shock absorber buffer bracket reinforcement plate 6, and the front and rear ends of the rear shock absorber buffer bracket reinforcement 4 are provided with a fourth flange 4-14, and a fifth flange 4-16 is provided at the lower side of the rear shock absorber buffer bracket reinforcement 4, and a ninth positioning hole 4-11 and a tenth positioning hole 4-12 are provided on the fifth flange 4-16, wherein the ninth positioning hole 4-11 is the main positioning hole of the rear shock absorber buffer bracket reinforcement 4, and the tenth positioning hole 4-12 is the secondary positioning hole of the rear shock absorber buffer bracket reinforcement 4.

[0052] like Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, in a possible embodiment, the inner side surface 4 - 13 of the rear shock absorber buffer bracket reinforcement 4 is matched and connected with the outer side wall 3 - 13 of the rear shock absorber buffer bracket mounting plate 3 .

[0053] like Fig. 9 As shown, in a possible embodiment, the cross section of the front section 5 of the rear floor side beam is a U-shape with an opening facing upward, including a second bottom surface 5-13, and a third side surface 5-14 and a fourth side surface 5-15 respectively located on both sides of the second bottom surface 5-13, and a third flange 5-16 is provided on the upper side of the third side surface 5-14. A third positioning hole 5-11 and a fourth positioning hole 5-12 are provided on the second bottom surface 5-13, wherein the third positioning hole 5-11 is a main positioning hole of the front section 5 of the rear floor side beam, and the fourth positioning hole 5-12 is a secondary positioning hole of the front section 5 of the rear floor side beam.

[0054] like Figure 1 and Figure 2As shown, in a possible embodiment, the rear end of the front section of the rear floor side beam 5 is matched and connected with the first bottom surface 1-13 of the front end of the rear floor side beam rear section 1 through the second bottom surface 5-13, and the rear end of the front section of the rear floor side beam 5 is also matched and connected with the first side surface 1-14 of the rear floor side beam rear section 1 through the third side surface 5-14. The third flange 5-16 on the rear end of the third side surface 5-14 is matched and welded with the first flange 1-15 of the front end of the rear floor side beam rear section 1. The rear end of the front section of the rear floor side beam 5 is matched and connected with the third bottom surface 2-13 of the front section of the reinforcement 2 in the rear floor side beam through the second bottom surface 5-13, and the rear end of the front section of the rear floor side beam 5 is also matched and connected with the fifth side surface 2-14 of the front section of the reinforcement 2 in the rear floor side beam through the third side surface 5-14. The fourth side surface 5-15 of the rear end of the front section of the rear floor side beam 5 and the second flange 1-16 of the rear section of the rear floor side beam 1 are also matched and connected with the fourth flange 4-14 of the rear shock absorber buffer bracket reinforcement 4 respectively. The fifth flange 4-16 of the rear shock absorber buffer bracket reinforcement 4 is matched and connected with the first bottom surface 1-13 at the front end of the rear floor side beam rear section 1 and the second bottom surface 5-13 at the rear end of the rear floor side beam front section 5. The outer side surface 4-15 of the rear shock absorber buffer bracket reinforcement 4 is matched and connected with the sixth side surface 2-15 of the rear floor side beam middle reinforcement 2.

[0055] like Fig.10 As shown, in a possible embodiment, an eleventh positioning hole 6-11 and a twelfth positioning hole 6-12 are provided on the rear shock absorber buffer bracket reinforcement plate 6, wherein the eleventh positioning hole 6-11 is the main positioning hole of the rear shock absorber buffer bracket reinforcement plate 6, and the twelfth positioning hole 6-12 is the secondary positioning hole of the rear shock absorber buffer bracket reinforcement plate 6.

[0056] like Figure 1 and Figure 2 As shown, the front overlap surface 6-13 of the rear shock absorber buffer bracket reinforcement plate 6 is matched and connected with the fourth side surface 5-15 of the rear end of the rear floor side beam front section 5 and the fourth flange 4-14 of the front end of the rear shock absorber buffer bracket reinforcement 4, and the rear overlap surface 6-14 of the rear shock absorber buffer bracket reinforcement plate 6 is matched and connected with the second side surface 1-17 of the front end of the rear floor side beam rear section 1 and the fourth flange 4-14 of the rear end of the rear shock absorber buffer bracket reinforcement 4. The inner surface 6-15 of the rear shock absorber buffer bracket reinforcement plate 6 is matched and connected with the outer side wall 3-13 of the rear shock absorber buffer bracket mounting plate 3.

[0057] The rear floor side beam assembly of the automobile in the embodiment of the present application has an overall appearance of an "olive-shaped" structure that is large in the middle and small at both ends, thereby increasing the cross-section of the cavity to the greatest extent. The installation position of the rear shock absorber buffer bracket structure extends to the inner side of the rear floor side beam cavity, thereby realizing the rational use of the internal cavity space of the rear floor side beam and reducing the encroachment on the chassis space. On the other hand, considering the material utilization rate of the rear floor side beam body, the rear floor side beam body adopts a segmented type, that is, it is divided into the front section 5 of the rear floor side beam and the rear section 1 of the rear floor side beam at the installation position of the rear shock absorber buffer bracket structure, and is connected in the middle by the rear shock absorber buffer bracket reinforcement 4, the rear floor side beam middle reinforcement 2, and the rear shock absorber buffer bracket reinforcement plate 6; wherein, the rear floor side beam middle reinforcement 2 is in a "U" shape, which not only plays a connecting role for the front section 5 of the rear floor side beam, the rear section 1 of the rear floor side beam, and the rear shock absorber buffer bracket reinforcement 4, but also plays a reinforcing role.

[0058] In an embodiment of the present application, a car adopts the car rear floor side beam assembly as described in the embodiment of the present application.

[0059] The above-mentioned embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above-mentioned embodiments. Any other changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A rear floor side beam assembly for an automobile, characterized in that: The overall structure is large in the middle and small at both ends, and comprises a rear section of a rear floor side beam (1), a rear shock absorber buffer bracket mounting plate (3), a rear shock absorber buffer bracket reinforcement member (4), a front section of a rear floor side beam (5) and a rear shock absorber buffer bracket reinforcement member (6); the front end of the rear section of the rear floor side beam (1) and the rear end of the front section of the rear floor side beam (5) are fixedly connected together through the rear shock absorber buffer bracket mounting plate (3), the rear shock absorber buffer bracket reinforcement member (4) and the rear shock absorber buffer bracket reinforcement member (6), and the rear shock absorber buffer bracket mounting plate (3), the rear shock absorber buffer bracket reinforcement member (4) and the rear shock absorber buffer bracket reinforcement member (6) form a rear shock absorber buffer bracket structure.

2. The automobile rear floor side beam assembly according to claim 1, characterized in that: The cross section of the rear section (1) of the rear floor side beam is a U-shape with an opening facing upward, comprising a first bottom surface (1-13), and a first side surface (1-14) and a second side surface (1-17) respectively located on both sides of the first bottom surface (1-13); a first flange (1-15) is provided on the first side surface (1-14), and a second flange (1-16) is provided on the second side surface (1-17).

3. The automobile rear floor side beam assembly according to claim 2, characterized in that: A first positioning hole (1-11) and a second positioning hole (1-12) are provided on the first bottom surface (1-13).

4. The automobile rear floor side beam assembly according to claim 2, characterized in that: The cross section of the front section (5) of the rear floor side beam is a U-shape with an opening facing upward, comprising a second bottom surface (5-13), and a third side surface (5-14) and a fourth side surface (5-15) respectively located on both sides of the second bottom surface (5-13), and a third flange (5-16) is provided on the upper side of the third side surface (5-14); The rear end of the front section (5) of the rear floor side beam is matched and connected with the first bottom surface (1-13) of the front end of the rear section (1) of the rear floor side beam via the second bottom surface (5-13); The rear end of the front section (5) of the rear floor side beam is also matched and connected to the first side surface (1-14) of the rear section (1) of the rear floor side beam via the third side surface (5-14); The third flange (5-16) on the rear end of the third side surface (5-14) is matched and welded to the first flange (1-15) at the front end of the rear section (1) of the rear floor side beam.

5. The automobile rear floor side beam assembly according to claim 4, characterized in that: A third positioning hole (5-11) and a fourth positioning hole (5-12) are provided on the second bottom surface (5-13).

6. The automobile rear floor side beam assembly according to claim 4, characterized in that: Also included is a rear floor side beam middle reinforcement member (2), wherein the cross section of the rear floor side beam middle reinforcement member (2) is a U-shape with an opening facing upward, and comprises a third bottom surface (2-13), and a fifth side surface (2-14) and a sixth side surface (2-15) respectively located on both sides of the third bottom surface (2-13); The rear section of the reinforcement member (2) in the rear floor side beam is matched and connected with the first bottom surface (1-13) of the rear section of the rear floor side beam (1) via the third bottom surface (2-13), and the rear section of the reinforcement member (2) in the rear floor side beam is also matched and connected with the first side surface (1-14) of the rear section of the rear floor side beam (1) via the fifth side surface (2-14); The front section of the reinforcement member (2) in the rear floor side beam is matched and connected with the second bottom surface (5-13) of the front section (5) of the rear floor side beam via the third bottom surface (2-13); The front section of the reinforcement member (2) in the rear floor side beam is also matched and connected with the third side surface (5-14) of the front section (5) of the rear floor side beam via the fifth side surface (2-14).

7. The automobile rear floor side beam assembly according to claim 6, characterized in that: The third bottom surface (2-13) is provided with a fifth positioning hole (2-11) and a sixth positioning hole (2-12).

8. The automobile rear floor side beam assembly according to claim 6, characterized in that: A seventh positioning hole (3-11) and an eighth positioning hole (3-12) are provided on the top surface of the rear shock absorber buffer bracket mounting plate (3).

9. The automobile rear floor side beam assembly according to claim 6, characterized in that: The rear shock absorber buffer bracket reinforcement (4) is U-shaped with its opening facing the rear shock absorber buffer bracket reinforcement plate (6), the front end and the rear end of the rear shock absorber buffer bracket reinforcement (4) are both provided with a fourth flange (4-14), and the lower side of the rear shock absorber buffer bracket reinforcement (4) is provided with a fifth flange (4-16); The inner side surface (4-13) of the rear shock absorber buffer bracket reinforcement (4) is matched and connected with the outer side wall (3-13) of the rear shock absorber buffer bracket mounting plate (3); The rear shock absorber buffer bracket reinforcement (4) is matched and connected to the fourth side surface (5-15) of the front section of the rear floor side beam (5) and the second flange (1-16) of the rear section of the rear floor side beam (1) respectively through the fourth flange (4-14); The fifth flange (4-16) of the rear shock absorber buffer bracket reinforcement (4) is matched and connected to the first bottom surface (1-13) of the front end of the rear section (1) of the rear floor side beam and the second bottom surface (5-13) of the rear end of the front section (5) of the rear floor side beam respectively; The outer side surface (4-15) of the rear shock absorber buffer bracket reinforcement (4) is matched and connected with the sixth side surface (2-15) of the reinforcement (2) in the rear floor side beam.

10. The automobile rear floor side beam assembly according to claim 9, characterized in that: A ninth positioning hole (4-11) and a tenth positioning hole (4-12) are provided on the fifth flange (4-16).

11. The automobile rear floor side beam assembly according to claim 9, characterized in that: The front overlap surface (6-13) of the rear shock absorber buffer bracket reinforcement plate (6) is matched and connected with the fourth side surface (5-15) at the rear end of the front section (5) of the rear floor side beam and the fourth flange (4-14) at the front end of the rear shock absorber buffer bracket reinforcement (4); The rear overlap surface (6-14) of the rear shock absorber buffer bracket reinforcement plate (6) is matched and connected to the second side surface (1-17) at the front end of the rear section of the rear floor side beam (1) and the fourth flange (4-14) at the rear end of the rear shock absorber buffer bracket reinforcement (4); The inner surface (6-15) of the rear shock absorber buffer bracket reinforcement plate (6) is matched and connected with the outer side wall (3-13) of the rear shock absorber buffer bracket mounting plate (3).

12. The automobile rear floor side beam assembly according to claim 11, characterized in that: The rear shock absorber buffer bracket reinforcement plate (6) is provided with an eleventh positioning hole (6-11) and a twelfth positioning hole (6-12).

13. A car, characterized in that: An automobile rear floor side beam assembly as described in any one of claims 1 to 12 is used.

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