Rear floor rear crossbeam assembly structure and vehicle

Abstract

This application discloses a rear floor and rear crossbeam assembly structure and a vehicle. The rear floor and rear crossbeam assembly structure includes an upper crossbeam subassembly, a lower crossbeam subassembly, and a rear floor. The upper crossbeam subassembly includes an upper rear crossbeam, and the lower crossbeam subassembly includes a lower rear crossbeam. The lower rear crossbeam and the upper rear crossbeam enclose a cavity. The rear end of the rear floor is sandwiched between the upper and lower rear crossbeams and connected to the upper and lower rear crossbeams. This design can effectively improve the NVH characteristics of the rear end of the vehicle.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a rear floor and rear crossbeam assembly structure and a vehicle. Background Art

[0002] The main excitation source at the rear end of the vehicle includes the rear wheel excitation, which is transmitted through the transmission path of tire → suspension → frame → body and is transmitted to the rear floor assembly of the vehicle.

[0003] As the carrier for the second and even third rows of seats, the rear floor assembly not only provides mounting points for the seats but, more importantly, its structural design must enhance rear-end comfort and improve NVH (Noise, Vibration, and Harshness) characteristics. Therefore, effectively improving NVH characteristics at the rear end of the vehicle has become a pressing issue. Summary of the Invention

[0004] The embodiments of the present application provide a rear floor and rear cross beam assembly structure and a vehicle, which can solve the problem of poor NVH characteristics of the rear end of the vehicle in the related art.

[0005] In the first aspect, an embodiment of the present application provides a rear floor rear cross beam assembly structure; the rear floor rear cross beam assembly structure includes an upper cross beam sub-assembly, a lower cross beam sub-assembly and a rear floor, the upper cross beam sub-assembly includes an upper rear cross beam, the lower cross beam sub-assembly includes a lower rear cross beam, the lower rear cross beam and the upper rear cross beam enclose a cavity to form, the rear end of the rear floor is clamped between the upper rear cross beam and the lower rear cross beam, and the rear end of the rear floor is connected to the upper rear cross beam and the lower rear cross beam.

[0006] Based on the rear floor rear crossbeam assembly structure of the embodiment of the present application, the upper rear crossbeam and the lower rear crossbeam form a box-shaped cavity structure, which can greatly improve the buffering and energy absorption capacity of the rear end of the vehicle, effectively reduce the vibration response sensitivity, so as to reduce road noise, thereby effectively improving the NVH characteristics of the rear end of the vehicle; the upper rear crossbeam and the lower rear crossbeam perform an intermediate sandwich connection on the rear end of the rear floor, on the one hand, it can effectively enhance the connection stability between the rear floor and the upper rear crossbeam, and between the rear floor and the lower rear crossbeam, and on the other hand, it can also effectively enhance the connection stiffness and connection strength between the rear floor and the upper rear crossbeam, and between the rear floor and the lower rear crossbeam.

[0007] In a second aspect, an embodiment of the present application provides a vehicle comprising a vehicle body and the above-mentioned rear floor rear cross beam assembly structure.

[0008] Based on the vehicle in the embodiment of the present application, a vehicle having the above-mentioned rear floor and rear crossbeam assembly structure can greatly improve the buffering and energy absorption capacity of the rear end of the vehicle, effectively reduce the vibration response sensitivity, thereby reducing road noise, and thus effectively improving the NVH characteristics of the rear end of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0010] Figure 1 This is a structural schematic diagram of a rear floor rear crossbeam assembly structure in one embodiment of the present application;

[0011] Figure 2 This is a schematic structural diagram of the rear floor rear cross beam assembly structure in one embodiment of the present application from another perspective;

[0012] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at AA';

[0013] Figure 4 This is a schematic structural diagram of an upper rear crossbeam in an embodiment of the present application;

[0014] Figure 5 This is a schematic diagram of the partial structure of the upper rear cross beam in one embodiment of the present application;

[0015] Figure 6 This is a partial structural diagram of a tailgate latch reinforcement plate installed on an upper rear crossbeam in one embodiment of the present application;

[0016] Figure 7 This is a schematic diagram of the exploded structure of the rear door latch reinforcement plate and the upper rear crossbeam in one embodiment of the present application;

[0017] Figure 8 This is a schematic structural diagram of an upper crossbeam subassembly in one embodiment of the present application;

[0018] Figure 9 This is a schematic diagram of the exploded structure of the upper crossbeam subassembly in one embodiment of the present application;

[0019] Figure 10 This is a structural diagram of the second connecting plate in one embodiment of the present application;

[0020] Figure 11 This is a structural schematic diagram of the upper crossbeam subassembly in one embodiment of the present application from another perspective;

[0021] Figure 12 This is a schematic structural diagram of a lower crossbeam subassembly in one embodiment of the present application;

[0022] Figure 13 This is a schematic structural diagram of a first rear crossbeam in one embodiment of the present application;

[0023] Figure 14 This is a schematic structural diagram of the lower crossbeam subassembly in one embodiment of the present application from another perspective;

[0024] Figure 15 This is a structural schematic diagram of the lower crossbeam subassembly in one embodiment of the present application from another perspective;

[0025] Figure 16 This is a schematic diagram of the exploded structure of the lower crossbeam subassembly in one embodiment of the present application.

[0026] Explanation of the accompanying symbols: 1. Rear floor rear crossbeam assembly structure; 10. Upper crossbeam subassembly; 11. Upper rear crossbeam; 110. Cavity; 111. Upper crossbeam body; 1111. First plate body; 1112. Second plate body; 11121. Inclined surface; 11122. Door lock mounting hole; 11123. Plate surface; 1113. First reinforcement body; 1114. Friction-increasing structure; 1115. Second reinforcement body; 112. Flanging; 1121. Flanging body ; 11211, pre-installation area; 1122, boss; 11221, installation surface; 11222, groove; 11223, first sub-surface; 11224, second sub-surface; 12, back door lock reinforcement plate; 121, notch; 122, first welding point; 123, second welding point; 124, third welding point; 13, first connecting plate; 131, first sub-connecting plate; 132, second sub-connecting plate; 14, second connecting plate; 141, first connecting plate end; 142, second connecting end; 143, third connecting end; 144, third reinforcement; 145, third sub-connecting plate; 146, fourth sub-connecting plate; 15, third connecting plate; 20, lower crossbeam subassembly; 21, lower rear crossbeam; 211, first rear crossbeam; 2111, third plate; 2112, fourth plate; 2113, fifth plate; 2114, fourth reinforcement; 2115, fifth reinforcement; 2116, sixth reinforcement; 2117. Seventh reinforcement; 2118. Mounting hole; 212. Second rear cross member; 2124. Notch; 213. Third rear cross member; 22. Side panel connecting plate; 221. First side panel connecting plate; 222. Second side panel connecting plate; 23. Body suspension mounting plate; 24. Bumper mounting bracket; 25. Spare tire mounting bracket; 30. Rear floor; XX', length direction of the vehicle; YY', width direction of the vehicle; ZZ', height direction of the vehicle. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0028] The main excitation source at the rear end of the vehicle includes the rear wheel excitation, which is transmitted through the transmission path of tire → suspension → frame → body and is transmitted to the rear floor assembly of the vehicle.

[0029] As a carrier for the vehicle's second and even third rows of seats, the rear floor assembly not only provides mounting points for the seats, but more importantly, it is also structurally designed to enhance the comfort of the rear end of the vehicle, thereby improving the NVH (Noise, Vibration, Harshness) characteristics of the rear end of the vehicle.

[0030] However, the rear floor assembly in the related art includes a rear floor, a rear upper cross beam and a rear lower cross beam. The rear upper cross beam is located above the rear lower cross beam and connected to the rear lower cross beam, and the rear floor is located below the rear lower cross beam and connected to the rear lower cross beam. After testing, it was found that with such a design, when the vehicle is driving on twisted roads and other bumpy roads, the displacement between the vehicle's tailgate and the door frame becomes larger, causing the tailgate sealing strip to rub against the body to produce abnormal noise, affecting the NVH characteristics of the rear end of the vehicle.

[0031] Therefore, how to effectively improve the NVH characteristics of the rear end of the vehicle has become an urgent problem to be solved.

[0032] To solve the above problems, please refer to Figure 1-Figure 3 As shown, the first aspect of the present application proposes a rear floor rear cross beam assembly structure 1, which can effectively improve the NVH characteristics of the rear end of the vehicle.

[0033] The rear floor rear cross beam assembly structure 1 includes an upper cross beam subassembly 10, a lower cross beam subassembly 20 and a rear floor 30; the upper cross beam subassembly 10 includes an upper rear cross beam 11; the lower cross beam subassembly 20 includes a lower rear cross beam 21, and the lower rear cross beam 21 and the upper rear cross beam 11 enclose a cavity 110; the rear end of the rear floor 30 is clamped between the upper rear cross beam 11 and the lower rear cross beam 21, and the rear end of the rear floor 30 is connected to the upper rear cross beam 11 and the lower rear cross beam 21.

[0034] The following combination Figures 1-16 The specific structure of the rear floor rear cross member assembly structure 1 is introduced in detail.

[0035] like Figure 1-Figure 3As shown, the rear floor rear cross beam assembly structure 1 includes an upper cross beam sub-assembly 10 , a lower cross beam sub-assembly 20 and a rear floor 30 .

[0036] The upper cross beam subassembly 10 is a component used to support the rear floor 30 . The specific structure of the upper cross beam subassembly 10 will be described in detail below.

[0037] The upper cross member sub-assembly 10 includes an upper rear cross member 11 .

[0038] The upper rear cross beam 11 serves as the main body of the upper cross beam sub-assembly 10. There is no limitation on the specific material of the upper rear cross beam 11. Designers can reasonably select a material with high strength and high rigidity according to actual needs. The specific structure of the upper rear cross beam 11 will be introduced in detail below.

[0039] The lower cross beam sub-assembly 20 is another component for supporting the rear floor 30 . The specific structure of the lower cross beam sub-assembly 20 will be described in detail below.

[0040] The lower cross member sub-assembly 20 includes a lower rear cross member 21 .

[0041] The lower rear cross beam 21 serves as the main body of the lower cross beam sub-assembly 20. There is no limitation on the specific material of the lower rear cross beam 21. Designers can reasonably select a material with high strength and high rigidity according to actual needs. The specific structure of the lower rear cross beam 21 will be introduced in detail below.

[0042] The lower rear cross beam 21 and the upper rear cross beam 11 enclose a cavity 110. The cavity 110 extends along the width direction YY' of the vehicle. The number of cavities 110 can be one or more. When the number of cavities 110 is more than one, the multiple cavities 110 can be distributed at intervals along the width direction YY' of the vehicle. There is no limitation on the cross-sectional shape of the cavity 110 along the width direction YY' perpendicular to the vehicle. Designers can make reasonable designs according to actual needs. The box-shaped cavity 110 structure formed by the lower rear cross beam 21 and the upper rear cross beam 11 can greatly improve the buffering and energy absorption capacity of the rear end of the vehicle. At the same time, the high strength and high rigidity design of the lower rear cross beam 21 and the upper rear cross beam 11 can reduce the amount of intrusion when the vehicle collides, greatly improving the collision safety factor of the rear end of the vehicle.

[0043] The rear floor 30 is used to support, for example, the second or even third row of seats in a vehicle. The specific material of the rear floor 30 is not specified here, and designers can select it based on actual needs. Similarly, the specific structure of the rear floor 30 is not specified here, and designers can also design it based on actual needs. It is understood that the specific material and structure of the rear floor 30 may vary depending on the vehicle model.

[0044] The rear end of the rear floor 30 is sandwiched between the upper rear cross member 11 and the lower rear cross member 21. The rear end of the rear floor 30 is connected to both the upper and lower rear cross members 11 and 21. In other words, the upper and lower rear cross members 11 and 21 form a sandwich connection for the rear end of the rear floor 30. The specific connection between the rear floor 30 and the upper and lower rear cross members 11 and 21 will be described in detail below. This design effectively enhances the stability of the connections between the rear floor 30 and the upper and lower rear cross members 11 and 21, while also increasing the stiffness and strength of the connections between the rear floor 30 and the upper and lower rear cross members 11 and 21.

[0045] Based on the rear floor rear cross beam assembly structure 1 in the embodiment of the present application, the upper rear cross beam 11 and the lower rear cross beam 21 form a box-shaped cavity 110 structure, which can greatly improve the buffering and energy absorption capacity of the rear end of the vehicle; the high strength and high rigidity design of the upper rear cross beam 11 and the lower rear cross beam 21 can reduce the intrusion amount when the vehicle collides, and greatly improve the collision safety factor of the rear end of the vehicle; the upper rear cross beam 11 and the lower rear cross beam 21 perform an intermediate sandwich connection on the rear end of the rear floor 30, which can effectively enhance the connection stability between the rear floor 30 and the upper rear cross beam 11, and between the rear floor 30 and the lower rear cross beam 21 on the one hand, and can also effectively enhance the connection stiffness and connection strength between the rear floor 30 and the upper rear cross beam 11, and between the rear floor 30 and the lower rear cross beam 21 on the other hand.

[0046] Furthermore, if Figure 4-Figure 7 As shown, in some embodiments, the upper cross member subassembly 10 further includes a tailgate latch reinforcement plate 12. The upper rear cross member 11 includes an upper cross member body 111 and a flange 112. The flange 112 is located closer to the rear floor 30 than the upper cross member body 111, is bent and connected to the upper cross member body 111, and has a pre-installation area 11211. The tailgate latch reinforcement plate 12 is disposed on the side of the flange 112 facing the rear floor 30, corresponding to the pre-installation area 11211. The flange 112, the tailgate latch reinforcement plate 12, and the rear end of the rear floor 30 are welded together in three layers at a first weld point 122. The flange 112, the rear end of the rear floor 30, and the lower rear cross member 21 are welded together in three layers at a second weld point 123. The flange 112 and the tailgate latch reinforcement plate 12 are welded together in two layers at a third weld point 124. The orthographic projections of the first welding point 122 , the second welding point 123 and the third welding point 124 on the surface of the flange 112 facing away from the rear floor 30 fall within the pre-installation area 11211 .

[0047] The tailgate latch reinforcement plate 12 mates with the vehicle's tailgate latch (not shown) to provide structural reinforcement for the vehicle's tailgate latch. The specific structure of the tailgate latch reinforcement plate 12 is not specified here, and designers can design it based on actual needs. The "pre-installation area 11211" can be understood as the area on the flange 112 corresponding to the tailgate latch reinforcement plate 12 for mounting. A "weld point" can be understood as a relatively fixed connection point between multiple (or more) components using welding material through a welding process. In the embodiment of the present application, the welding point for achieving relative fixation of the positions of the flange 112, the rear door lock reinforcement plate 12 and the rear end of the rear floor 30 is the first welding point 122. The first welding point 122 can be arranged on both sides of the flange 112 along the height direction ZZ' of the vehicle. At this time, the first welding point 122 on the side where the rear door lock reinforcement plate 12 is located is used to achieve relative fixation of the positions between the rear door lock reinforcement plate 12 and the flange 112, and the first welding point 122 on the side where the rear floor 30 is located is used to achieve relative fixation of the positions between the rear door lock reinforcement plate 12 and the flange 112. Point 122 is used to achieve relative fixation of the position between the rear end of the rear floor 30 and the flange 112, thereby achieving three-layer welding among the tailgate lock reinforcement plate 12, the flange 112 and the rear floor 30; of course, it can also be at least one of the lock reinforcement plate and the rear floor 30, and the position corresponding to the flange 112 can also be provided with a first welding hole, and the first welding point 122 is passed through the first welding hole to achieve three-layer welding among the tailgate lock reinforcement plate 12, the flange 112 and the rear end of the rear floor 30. Similarly, the welding point used to achieve relative fixation of the positions of the flange 112, the rear end of the rear floor 30 and the lower rear cross beam 21 is the second welding point 123. The second welding point 123 can be arranged on both sides of the rear floor 30 along the height direction ZZ' of the vehicle. At this time, the second welding point 123 on the side where the flange 112 is located is used to achieve relative fixation of the positions between the flange 112 and the rear end of the rear floor 30, and the second welding point 123 on the side where the lower rear cross beam 21 is located is used to achieve relative fixation of the positions between the lower rear cross beam 21 and the rear end of the rear floor 30, thereby achieving three-layer welding among the flange 112, the rear end of the rear floor 30 and the lower rear cross beam 21; of course, it can also be at least one of the flange 112 and the lower rear cross beam 21, and the position corresponding to the rear floor 30 can also be provided with a second welding hole, and the second welding point 123 is penetrated by the second welding hole to achieve three-layer welding among the flange 112, the rear floor 30 and the lower rear cross beam 21.Similarly, the welding point used to achieve a relatively fixed position between the flange 112 and the tailgate latch reinforcement plate 12 is the third welding point 124 (different from the first welding point 122). The third welding point 124 is located on the side of the flange 112 where the tailgate reinforcement plate is located. The third welding point 124 is used to achieve double-layer welding between the tailgate latch reinforcement plate 12 and the flange 112. Of course, at least one of the latch reinforcement plate and the flange 112 may be provided with a third welding hole, and the third welding point 124 may pass through the third welding hole to achieve double-layer welding between the tailgate latch reinforcement plate 12 and the flange 112.

[0048] Furthermore, if Figure 4-Figure 7 As shown, in some embodiments, the flange 112 includes a flange body 1121 and a boss 1122; the flange body 1121 is bent and connected to the upper crossbeam body 111, and the flange body 1121 has a pre-installation area 11211; the boss 1122 extends from the pre-installation area 11211 of the flange body 1121 in a direction away from the rear floor 30, and the boss 1122 has a mounting surface 11221 facing away from the flange body 1121, and the mounting surface 11221 is formed on the flange. The orthographic projection of the main body on the surface facing away from the rear floor 30 falls within the pre-installation area 11211. The installation surface 11221 is defined by at least one recess 11222, which divides the installation surface 11221 into a first sub-surface 11223 and a second sub-surface 11224 located on either side of the notch of recess 11222. When the tailgate latch reinforcement plate 12 is positioned on the upper rear cross member 11, the notch 121 of the tailgate latch reinforcement plate 12 aligns with the notch of recess 11222. A first weld point 122 corresponds to the first sub-surface 11223, a second weld point 123 corresponds to the bottom wall of recess 11222, and a third weld point 124 corresponds to the second sub-surface 11224.

[0049] It should be noted that the first sub-surface 11223 and the second sub-surface 11224 are respectively arranged on both sides of the notch of the groove 11222 along the width direction YY′ of the vehicle. When the number of grooves 11222 is one, the groove 11222 divides the mounting surface 11221 into a first sub-surface 11223 and a second sub-surface 11224 which are arranged on both sides of the notch of the groove 11222 along the width direction YY' of the vehicle; when the number of grooves 11222 is two, the two grooves 11222 divide the mounting surface 11221 into two first sub-surfaces 11223 and a second sub-surface 11224 which are arranged along the width direction YY' of the vehicle, and the one second sub-surface 11224 is located between the notches of the two grooves 11222, one first sub-surface 11223 is located on the side of one groove 11222 opposite to the second sub-surface 11224, and the other first sub-surface 11223 is located on the side of the other groove 11222 opposite to the second sub-surface 11224.

[0050] In this design, the first welding point 122, the second welding point 123 and the third welding point 124 are arranged along the width direction YY' of the vehicle, which can ensure the welding effectiveness between the tailgate lock reinforcement plate 12 and the flange 112, the flange 112 and the rear floor 30, and the rear floor 30 and the lower rear cross beam 21, while improving the strength of the connection parts between the tailgate lock reinforcement plate 12 and the flange 112, the flange 112 and the rear floor 30, and the rear floor 30 and the lower rear cross beam 21.

[0051] Specifically, the flange body 1121 extends toward the front of the vehicle from the side where it connects to the upper crossbeam body 111. The flange body 1121 is approximately 16.5 mm wide, with the pre-installation area 11211 located directly in the center of the flange body 1121. The boss 1122 is rectangular in shape, approximately 168 mm long along the vehicle's width direction YY'. The boss 1122 forms an integral structure with the pre-installation area 11211 and the flange body 1121. The mounting surface 11221 of the boss 1122, facing away from the flange body 1121, is provided with two grooves 11222. Both grooves 11222 are arch-shaped, each approximately 31 mm long along the vehicle's width direction YY' and approximately 2.6 mm deep along the vehicle's height direction ZZ'. With this design, the rectangular boss 1122 facilitates the arrangement of the tailgate lock reinforcement plate 12, and the two arched grooves 11222 realize the cooperation between the upper rear cross beam 11 and the notch 121 of the tailgate lock reinforcement plate 12, and realize the arrangement of the first welding point 122, the second welding point 123, the third welding point 124, the second welding point 123 and the first welding point 122 in sequence along the width direction YY' of the vehicle, which can ensure the welding effectiveness between the tailgate lock reinforcement plate 12 and the flange 112, the flange 112 and the rear floor 30, and the rear floor 30 and the lower rear cross beam 21, while improving the strength of the connection parts between the tailgate lock reinforcement plate 12 and the flange 112, the flange 112 and the rear floor 30, and the rear floor 30 and the lower rear cross beam 21.

[0052] Furthermore, if Figure 4 As shown, the upper cross beam body 111 includes a first plate body 1111 and a second plate body 1112; one side of the first plate body 1111 is connected to the flange 112; the second plate body 1112 is bent and connected to the side of the first plate body 1111 away from the flange 112, and the second plate body 1112 and the flange 112 are arranged on both sides of the first plate body 1111 along the longitudinal direction XX' of the vehicle.

[0053] Specifically, the first plate 1111 and the second plate 1112 are spliced in a cross-section perpendicular to the width direction YY' of the vehicle to form an "L-shape", the width of the first plate 1111 is approximately 76 mm, the width of the second plate 1112 is approximately 95 mm, the obtuse angle between the first plate 1111 and the second plate 1112 is approximately 118 degrees, and there is an arc transition between the first plate 1111 and the second plate 1112, and the transition radius is approximately 25 mm.

[0054] Of course, the upper cross beam body 111 also includes a first reinforcement body 1113. There are multiple first reinforcement bodies 1113. All first reinforcement bodies 1113 are arranged on the first plate body 1111, and all first reinforcement bodies 1113 are spaced apart along the width direction YY' of the vehicle. Among them, the first reinforcement body 1113 includes at least one of a first protrusion and a first recess provided on the first plate body 1111. For example, the first reinforcement body 1113 can be only a first protrusion, or only a first recess, or a combination of a first protrusion and a first recess. The first protrusion is a physical structure provided on the surface of the first plate body 1111, and the first recess is a virtual structure extending inward from the surface of the first plate body 1111. The first reinforcement body 1113 can form an integrated structure with the first plate body 1111 by injection molding or 3D printing.

[0055] The specific form of the first reinforcement 1113 and the arrangement of the first reinforcement 1113 on the first plate 1111 may be, but are not limited to, one or more of the following embodiments.

[0056] In a first embodiment, at least one of the shapes and sizes of all first reinforcements 1113 differs. In this design, by designing the first reinforcements 1113 on the first plate 1111, the first reinforcements 1113 act as reinforcing ribs, effectively enhancing the structural strength of the first plate 1111. By designing all first reinforcements 1113 to have different sizes, the vibration frequencies of all first reinforcements 1113 differ, effectively reducing the local resonance of the first plate 1111 caused by the rear wheel excitation energy, thereby effectively reducing the vibration sensitivity of the upper rear cross member 11, thereby reducing road noise. By designing all first reinforcements 1113 to have different shapes, the vibration frequencies of all first reinforcements 1113 differ, effectively reducing the local resonance of the first plate 1111 caused by the rear wheel excitation energy, thereby effectively reducing the vibration sensitivity of the upper rear cross member 11, thereby reducing road noise.

[0057] In the second embodiment, the spacing between any two adjacent first reinforcements 1113 along the vehicle width direction YY' is unequal. This design effectively reduces the local resonance generated on the first plate 1111 by the rear wheel excitation energy, thereby effectively reducing the vibration sensitivity of the upper rear cross member 11 and reducing road noise.

[0058] In the third embodiment, one end of each first reinforcement 1113 extends to the connection between the first plate 1111 and the second plate 1112, and the other end of each first reinforcement 1113 extends to the connection between the first plate 1111 and the flange 112. In other words, the first reinforcement 1113 extends along the vehicle's height direction ZZ' until its ends connect with the second plate 1112 and the flange 112, respectively. In this design, the first reinforcement 1113 extends along the vehicle's height direction ZZ' to the second plate 1112 and the flange 112, effectively improving the surface stiffness of the first plate 1111.

[0059] Specifically, there are four first reinforcements 1113, each of which is a first protrusion. The upper cross-section of each first protrusion, perpendicular to the vehicle's longitudinal direction XX', is rectangular. The first protrusion extends through the second plate 1112 and the flange 112 along the vehicle's height direction ZZ'. Along the vehicle's width direction YY', the spacing between two adjacent inner first protrusions is approximately 388 mm, while the spacing between two outer first protrusions is approximately 680 mm. Along the vehicle's width direction YY', the length of the two inner first protrusions is approximately 27 mm, while the length of the two outer first protrusions is approximately 29 mm.

[0060] Of course, if Figure 4 As shown, in other embodiments, the second plate body 1112 has a slope 11121 arranged away from the rear floor 30, and the slope 11121 corresponds to the pre-installation area 1121. When the tailgate latch reinforcement plate 12 is positioned on the upper rear cross beam 11, the tailgate latch reinforcement plate 12 is in contact with the slope 11121; from the side away from the first plate body 1111 to the side close to the first plate body 1111, the distance between the slope 11121 and the surface of the rear floor 30 facing the second plate body 1112 gradually decreases.

[0061] Furthermore, the upper crossbeam body 111 also includes a second reinforcement body 1115 and / or a friction-enhancing structure 1114 for increasing friction. The arrangement of the friction-enhancing structure 1114 on the inclined surface 11121 and the arrangement of the second reinforcement body 1115 on the second plate body 1112 may include, but are not limited to, one or more of the following embodiments.

[0062] like Figure 5As shown, in the first embodiment, the inclined surface 11121 is provided with a door lock mounting hole 11122, and there are multiple friction-enhancing structures 1114, all of which are provided on the inclined surface 11121. At least two of the friction-enhancing structures 1114 are distributed on both sides of the door lock mounting hole 11122 along the vehicle width direction YY', and at least one of the friction-enhancing structures 1114 is distributed on a single side of the door lock mounting hole 11122 along the vehicle length direction XX'. The friction-enhancing structures 1114 can be fine-grooved protrusions or fine-grooved grooves provided on the inclined surface 11121. By designing a friction-increasing structure 1114 on the inclined surface 11121, the friction between the tailgate lock reinforcement plate 12 and the second plate body 1112 can be increased, so that after the bolt is threadedly connected to the door lock mounting hole 11122, the connection stability between the tailgate lock, the tailgate lock mounting plate and the upper rear cross beam 11 of the vehicle can be effectively enhanced.

[0063] like Figure 4 As shown, in the second embodiment, there is at least one second reinforcement 1115. The second plate 1112 further has a plate surface 11123 facing away from the rear floor 30. The second reinforcement 1115 is disposed on the plate surface 11123. The surface of the second plate 1112 facing away from the rear floor 30 includes the plate surface 11123 and the aforementioned inclined surface 11121. The plate surface 11123 is the surface of the second plate 1112 facing away from the rear floor 30, independent of the aforementioned inclined surface 11121. The second reinforcement 1115 includes at least one of a second protrusion and a second recess provided on the plate surface 11123. For example, the second reinforcement 1115 may comprise only the second protrusion, only the second recess, or a combination of the second protrusion and the recess. The second protrusion is a physical structure protruding from the plate surface 11123 of the second plate 1112, while the second recess is a virtual structure extending inward from the plate surface 11123 of the second plate 1112. The second reinforcement 1115 can be formed into an integral structure with the second plate 1112 by injection molding or 3D printing. In this design, the second reinforcement 1115 acts as a reinforcing rib for the second plate 1112, effectively enhancing the structural strength of the second plate 1112 and, consequently, the upper rear cross member 11.

[0064] Specifically, inclined surface 11121 is located in the center of second plate 1112, corresponding to pre-installation area 11211. Along the vehicle's width direction YY', inclined surface 11121 is approximately 168 mm long, and along the vehicle's length direction XX', inclined surface 11121 is approximately 87 mm wide. The angle between inclined surface 11121 and the horizontal plane is approximately 17 degrees. Inclined surface 11121 is provided with two door lock mounting holes 11122, spaced apart along the vehicle's width direction YY'. Inclined surface 11121 is provided with three friction-enhancing structures 1114, which are fine grooves formed on inclined surface 11121. One fine groove is located in front of the two door lock mounting holes 11122, and the other two fine grooves are located on either side of the two door lock mounting holes 11122 along the vehicle's width direction YY'. There are multiple second reinforcement bodies 1115, which are second protrusions. Some of the second protrusions have an L-shaped cross-section along the height direction ZZ' perpendicular to the vehicle, and other parts of the second protrusions have a circular cross-section along the height direction ZZ' perpendicular to the vehicle.

[0065] Furthermore, if Figures 8-10 As shown, in some embodiments, the upper crossbeam subassembly 10 further includes a first connecting plate 13 and a second connecting plate 14; a third reinforcement body 144 is provided on the surface of the second connecting plate 14 and / or the edge of the second connecting plate 14; the second connecting plate 14 has a first connecting end 141, a second connecting end 142 and a third connecting end 143, the first connecting end 141 extends along the length direction XX' of the vehicle, the second connecting end 142 extends along the width direction YY' of the vehicle, and the third connecting end 143 extends along the height direction ZZ' of the vehicle; the first connecting end 141 is connected to the first connecting plate 13, the second connecting end 142 is connected to the upper rear crossbeam 11, and the third connecting end 143 is used to connect to the D-pillar inner panel of the vehicle (not shown in the figure).

[0066] The third reinforcement 144 includes at least one of a third protrusion and a third recess provided on the second connecting plate 14. For example, the third reinforcement 144 may be solely the third protrusion, solely the third recess, or a combination of the third protrusion and the third recess. The third protrusion is a physical structure protruding from the surface of the second connecting plate 14, while the third recess is a virtual structure extending inward from the surface of the second connecting plate 14. The third reinforcement 144 can be formed into an integral structure with the second connecting plate 14 by injection molding or 3D printing. Specifically, the third reinforcement 144 is a "arch-shaped" protrusion structure.

[0067] In this design, the second connecting plate 14 serves as the connecting hub structure of the upper crossbeam subassembly 10 and is located at the corner of the door sill of the vehicle's tailgate. Since the second connecting plate 14 connects many parts and is located in a special position, in order to ensure the rigidity and strength of the second connecting plate 14 itself, as well as the stability of the connection between the second connecting plate 14 and the first connecting plate 13, the upper rear crossbeam 11 and the inner plate of the D-pillar of the vehicle, the arched structure is used to facilitate force transmission and load-bearing. Arched third reinforcement bodies 144 are provided at multiple locations on the surface and edges of the second connecting plate 14 for transition.

[0068] Furthermore, if Figure 9 、 Figure 11-12 As shown, in some embodiments, the lower cross member subassembly 20 further includes a side panel connecting plate 22; the first connecting plate 13 has a first cross section that is perpendicular to the vehicle's height direction ZZ' and is trapezoidal in shape; the upper base of the first cross section of the first connecting plate 13 is connected to the side panel connecting plate 22, the lower base of the first cross section of the first connecting plate 13 is connected to the rear floor 30, the height of the first cross section of the first connecting plate 13 is connected to the second connecting plate 14, and the oblique height of the first cross section of the first connecting plate 13 is used to connect to the rear wheelhouse inner panel of the vehicle (not shown); there are two first connecting plates 13, and the first cross sections of the two first connecting plates 13 have unequal areas. The first connecting plate 13 extends from the second connecting plate 14 toward the front of the vehicle to increase the contact area with the rear floor 30 and the side panel connecting plate 22. By designing the first cross-section of the first connecting plate 13 into a trapezoid, and making the four sides of the first connecting plate 13 tightly connected to the side connecting plate 22, the rear floor 30, the second connecting plate 14 and the inner panel of the rear wheel arch of the vehicle, the reliability and stability of the connection between the rear floor 30 and the upper crossbeam subassembly 10 and the lower crossbeam subassembly 20 are further improved.

[0069] Furthermore, if Figure 9 and Figure 11As shown, specifically, the upper crossbeam subassembly 10 also includes a jack mounting plate (not shown in the figure); the two first connecting plates 13 are respectively a first sub-connecting plate 131 and a second sub-connecting plate 132, and the second sub-connecting plate 132 is connected to the jack mounting plate; the number of the second connecting plates 14 is also two, and the two second connecting plates 14 are respectively a third sub-connecting plate 145 and a fourth sub-connecting plate 146; the first sub-connecting plate 131 is connected to the first connecting end 141 of the third sub-connecting plate 145, and the second connecting end 146 of the third sub-connecting plate 145 is connected to the The first sub-connecting plate 131 has a first connecting end 142 connected to one end of the upper rear cross member 11; the second sub-connecting plate 132 is connected to the first connecting end 141 of the fourth sub-connecting plate 146, and the second connecting end 142 of the fourth sub-connecting plate 146 is connected to the other end of the upper rear cross member 11; the first cross-section of the first sub-connecting plate 131 is perpendicular to the height direction ZZ' of the vehicle; the first cross-section of the second sub-connecting plate 132 is perpendicular to the height direction ZZ' of the vehicle; and the area of the first cross-section of the first sub-connecting plate 131 is smaller than the area of the first cross-section of the second sub-connecting plate 132. The third sub-connecting plate 145 is located on the left side of the vehicle, the first sub-connecting plate 131 is located on the left side of the vehicle, and the first sub-connecting plate 131 is connected to the left end of the upper rear cross member 11 via the third sub-connecting plate 145; the fourth sub-connecting plate 146 is located on the right side of the vehicle, the second sub-connecting plate 132 is located on the right side of the vehicle, and the second sub-connecting plate 132 is connected to the right end of the upper rear cross member 11 via the fourth sub-connecting plate 146. By designing the area of the first cross-section of the second sub-connecting plate 132 to be larger than the area of the first cross-section of the first sub-connecting plate 131, the second sub-connecting plate 132 and the first sub-connecting plate 131 are designed to be differentiated in size, and the jack mounting plate is installed on the larger second sub-connecting plate 132 to achieve the coordination of the size difference and mass difference between the second sub-connecting plate 132 and the first sub-connecting plate 131, so that the vibration frequencies of the second sub-connecting plate 132 and the first sub-connecting plate 131 are different, which can effectively avoid resonance between the second sub-connecting plate 132 and the first sub-connecting plate 131 and is also beneficial to attenuate the excitation energy generated by the rear wheel.

[0070] Furthermore, if Figure 11 As shown, in some embodiments, the upper cross member subassembly 10 further includes a third connecting plate 15. The third connecting plate 15 is located on the side of the second connecting plate 14 facing away from the first connecting plate 13. The third connecting plate 15 is connected to the second connecting plate 14 and extends along the longitudinal direction XX' of the vehicle. In this design, the third connecting plate 15 extends from the second connecting plate 14 toward the rear of the vehicle. The design of the third connecting plate 15 effectively strengthens the side rigidity of the upper rear cross member 11, thereby improving the connection strength and support strength between the upper cross member subassembly 10 and the lower cross member subassembly 20.

[0071] Furthermore, if Figure 12-13As shown, in some embodiments, the lower rear cross beam 21 includes a first rear cross beam 211, and the first rear cross beam 211 includes a third plate 2111, a fourth plate 2112 and a fifth plate 2113; one side of the third plate 2111 is welded to the rear end of the rear floor 30, the fourth plate 2112 is bent and connected to the side of the third plate 2111 facing away from the rear floor 30, the fifth plate 2113 is bent and connected to the side of the fourth plate 2112 facing away from the third plate 2111, the fifth plate 2113 and the third plate 2111 are located on the same side of the fourth plate 2112, and the side of the fifth plate 2113 facing away from the fourth plate 2112 is connected to the upper rear cross beam 11.

[0072] Specifically, the length of the first rear crossbeam 211 along the vehicle's width direction YY' is approximately 792 mm. The third, fourth, and fifth plates 2111, 2112, and 2113 are joined to form a "U-shaped" cross-section perpendicular to the vehicle's width direction YY'. The third plate 2111 is approximately 63 mm wide, the fourth plate 2112 is approximately 76.5 mm wide, and the fifth plate 2113 is approximately 138 mm wide. This design, enclosing the U-shaped first rear crossbeam 211 and the L-shaped upper rear crossbeam 11 to form a cavity 110, significantly improves the vehicle's rear end's energy absorption capacity.

[0073] Of course, continue to see Figure 14 and Figure 15 The first rear cross beam 211 also includes a reinforcing structure, a fifth reinforcing body 2115, a sixth reinforcing body 2116 and a seventh reinforcing body 2117. The arrangement of the reinforcing structure on the third plate 2111, the arrangement of the fifth reinforcing body 2115 on the fourth plate 2112, the arrangement of the sixth reinforcing body 2116 on the fifth plate 2113, and the arrangement of the seventh reinforcing body 2117 on the fifth plate 2113 may be, but are not limited to, one or more of the following embodiments.

[0074] like Figure 14As shown, in a first embodiment, the number of reinforcing structures is at least three groups, each group of reinforcing structures includes two fourth reinforcing bodies 2114, all of which are disposed on the third plate 2111. All of the fourth reinforcing bodies 2114 are spaced apart along the vehicle width direction YY', and the spacing between the two fourth reinforcing bodies 2114 in each group of reinforcing structures satisfies an arithmetic progression. The fourth reinforcing bodies 2114 include at least one of a fourth protrusion and a fourth recess disposed on the third plate 2111. For example, the fourth reinforcing bodies 2114 may consist solely of the fourth protrusion, solely of the fourth recess, or a combination of the fourth protrusion and the fourth recess. The fourth protrusion is a physical structure protruding from the surface of the third plate 2111, while the fourth recess is a virtual structure extending inward from the surface of the third plate 2111. The fourth reinforcing bodies 2114 may be integrally formed with the third plate 2111 through injection molding or 3D printing. Specifically, there are three groups of reinforcement structures, and the three groups of reinforcement structures include a first reinforcement structure, a second reinforcement structure and a third reinforcement structure. The six fourth reinforcement bodies 2114 in the three groups of reinforcement structures are distributed on the third plate 2111 from the middle to the left and right sides of the vehicle. The fourth reinforcement body 2114 is a fourth protrusion. The distance between the two symmetrical fourth protrusions of the innermost first reinforcement structure is the first dimension L1, the distance between the two symmetrical fourth protrusions of the middle second reinforcement structure is the second dimension L2, and the distance between the two symmetrical fourth protrusions of the outermost third reinforcement structure is the third dimension L3. The first dimension L1, the second dimension L2 and the third dimension L3 satisfy the relationship: L1+L3=2L2. For example, the first dimension L1 is approximately 83 mm, the second dimension L2 is approximately 329 mm, and the third dimension L3 is approximately 608 mm. By designing the reinforcement structure to be arranged in an arithmetic progression on the third plate 2111 , the vibration frequencies of various parts of the third plate 2111 are different, which can effectively avoid resonance of the third plate 2111 and thus enhance the structural strength of the first rear cross beam 211 .

[0075] like Figure 15As shown, in the second embodiment, the lower crossbeam subassembly 20 also includes a spare tire mounting bracket 25, a fifth reinforcement 2115 is arranged in the middle of the fourth plate 2112, and the spare tire mounting bracket 25 is installed at the position of the fourth plate 2112 corresponding to the fifth reinforcement 2115. Among them, the fifth reinforcement 2115 includes at least one of a fifth protrusion and a fifth recess arranged on the fourth plate 2112. For example, the fifth reinforcement 2115 can be only the fifth protrusion, or only the fifth recess, or a combination of the fifth protrusion and the fifth recess. The fifth protrusion is a physical structure protruding from the surface of the fourth plate 2112, and the fifth recess is a virtual structure extending inward from the surface of the fourth plate 2112. The fifth reinforcement 2115 can form an integrated structure with the fourth plate 2112 by injection molding or 3D printing. Specifically, a fifth reinforcement 2115 is provided in the middle of the fourth plate 2112. The fifth reinforcement 2115 is a fifth recessed arched shape, with a width of approximately 32 mm along the vehicle's width direction YY' and a depth of approximately 18 mm along the vehicle's height direction ZZ'. The placement of the fifth reinforcement 2115 in the middle of the fourth plate 2112 acts as a reinforcing rib, enhancing the structural strength of the first rear cross member 211. The spare tire mounting bracket 25 is provided at the location on the fourth plate 2112 corresponding to the fifth reinforcement 2115. The arched structure of the fifth reinforcement 2115 facilitates pressure bearing.

[0076] like Figure 15As shown, in the third embodiment, there are multiple sixth reinforcements 2116 and multiple seventh reinforcements 2117. Multiple sixth reinforcements 2116 are disposed on the fifth plate 2113 and located on the side of the fifth plate 2113 away from the fourth plate 2112. Multiple seventh reinforcements 2117 are disposed on the fifth plate 2113, and all seventh reinforcements 2117 are closer to the fourth plate 2112 than all sixth reinforcements 2116. At least one seventh reinforcement 2117 is provided with a mounting hole 2118. The sixth reinforcement 2116 (seventh reinforcement 2117) includes at least one of a sixth protrusion (seventh protrusion) and a sixth recess (seventh recess) disposed on the fifth plate 2113. For example, the sixth reinforcement 2116 (seventh reinforcement 2117) may be solely the sixth protrusion (seventh protrusion), solely the sixth recess (seventh recess), or a combination of the sixth protrusion (seventh protrusion) and the sixth recess (seventh recess). The sixth protrusion (seventh protrusion) is a physical structure protruding from the surface of the fifth plate 2113, while the sixth recess (seventh recess) is a virtual structure extending inward from the surface of the fifth plate 2113. The sixth reinforcement 2116 (seventh reinforcement 2117) can be formed integrally with the fifth plate 2113 through injection molding or 3D printing. Specifically, there are three sixth reinforcements 2116, each of which serves as a sixth recess. The sixth recess is arched, leveraging the strength of the arched structure to enhance the structural strength of the first rear cross member 2111. There are four seventh reinforcement bodies 2117, and the four seventh reinforcement bodies 2117 include two seventh protrusions and two seventh recesses. The seventh protrusions and the seventh recesses are both rectangular, and a seventh protrusion is provided between two adjacent sixth recesses. The two seventh recesses are distributed at both ends of the fifth plate body 2113 along the width direction YY' of the vehicle. The seventh protrusions and the seventh recesses are both provided with mounting holes 2118, which are conducive to welding nuts or nut plates, so as to effectively improve the installation portability and assembly accuracy of other components on the first rear cross beam 211.

[0077] Furthermore, if Figure 12 、 Figure 13 and Figure 16 As shown, in some embodiments, the lower rear cross beam 21 further includes a second rear cross beam 212 and a third rear cross beam 213; one side of the second rear cross beam 212 is connected to the fifth plate 2113; one side of the third rear cross beam 213 is connected to the third plate 2111 and the fourth plate 2112, and the other side of the third rear cross beam 213 is connected to the other side of the second rear cross beam 212. The second rear cross beam 212 is an extension of the fifth plate 2113 of the first rear cross beam 211 in the vehicle width direction YY', and the third rear cross beam 213 is an extension of the third plate 2111 and the fourth plate 2112 of the first rear cross beam 211 in the vehicle width direction YY'.

[0078] Specifically, the length of the second rear cross member 212 along the width direction YY′ of the vehicle is approximately 386 mm, and the length of the third rear cross member 213 along the width direction YY′ of the vehicle is approximately 334 mm.

[0079] Furthermore, if Figure 12 and Figure 16 As shown, in some embodiments, the lower cross beam subassembly 20 also includes a side panel connecting plate 22 and a vehicle body suspension mounting plate 23; the second rear cross beam 212 has a second cross section, the second cross section is perpendicular to the longitudinal direction XX' of the vehicle, and the second cross section is trapezoidal; the side where the upper bottom of the second cross section of the second rear cross beam 212 is located is connected to the fifth plate 2113, the side where the lower bottom of the second cross section of the second rear cross beam 212 is located is connected to the side panel connecting plate 22, and the side where the height of the second cross section of the second rear cross beam 212 is located is connected to the other side of the third rear cross beam 213 and the vehicle body suspension mounting plate 23. In this design, the second rear cross-member 212 serves as the connecting hub of the lower cross-member sub-assembly 20. By designing the second cross-section of the second rear cross-member 212 into a trapezoidal shape and tightly connecting its three sides to the fifth plate 2113, the side panel connecting plate 22, and the vehicle body suspension mounting plate 23, the reliability and stability of the connection between the rear floor 30 and the lower cross-member sub-assembly 20 are further improved. Furthermore, the trapezoidal shape of the second cross-section of the second rear cross-member 212 further enhances the structural stability and durability of the second rear cross-member 212. It is worth noting that the "box-like" cavity structure enclosed by the vehicle body suspension mounting plate 23, the second rear cross-member 212, the third rear cross-member 213, the first connecting plate 13, and the second connecting plate 14 acts as a torsion box, effectively absorbing and releasing energy when the vehicle travels on bumpy roads, avoiding stress concentration and optimizing the vehicle's fatigue durability.

[0080] Furthermore, if Figure 12 and Figure 16 As shown, in some embodiments, the lower cross beam subassembly 20 also includes a bumper mounting bracket 24, and the side panel connecting plate 22 includes a first side panel connecting plate 221 and a second side panel connecting plate 222 that are fixedly connected; the first side panel connecting plate 221 is connected to the second rear cross beam 212 and the third rear cross beam 213, and at least one notch 2124 is provided at the connection between the first side panel connecting plate 221 and the second rear cross beam 212 and the third rear cross beam 213; the second side panel connecting plate 222 is located on the side of the first side panel connecting plate 221 away from the second rear cross beam 212, and the second side panel connecting plate 222 is connected to the second rear cross beam 212, the vehicle body suspension mounting plate 23 and the bumper mounting bracket 24.

[0081] Specifically, the first side panel 221 has an L-shaped structure. The length of the side where the first side panel 221 connects to the third rear cross member 213 is approximately 121 mm, and the length of the side where the first side panel 221 connects to the second rear cross member 212 is approximately 190 mm. A notch 2124 is provided on the side where the first side panel 221 connects to the third rear cross member 213, and a notch 2124 is also provided on the side where the first side panel 221 connects to the second rear cross member 212. This effectively prevents stress from forming at the bend of the first side panel 221, at the weld between the first side panel 221 and the second rear cross member 212, and at the connection between the first side panel 221 and the third rear cross member 213. Furthermore, a bracket is provided on the end where the first side panel 221 connects to the third rear cross member 213 to facilitate installation of the fourth vehicle body mount. The second side panel 222 extends forward and downward from the first side panel 221. It has a rectangular structure and is approximately 205 mm long along the vehicle's longitudinal direction (XX'). Its height along the vehicle's height direction (ZZ') is approximately 243 mm. The effective connection area of the second side panel 222 is approximately 500 square centimeters. In addition to being connected to the first side panel 221, the second side panel 222 is also connected to the second rear cross member 212 and the vehicle body suspension mounting plate 23. This increases the connection area between the second side panel 222 and the second rear cross member 212, and between the first side panel 221 and the second and third rear cross members 212 and 213, thereby enhancing the connection stiffness between the lower rear cross member 21 and the side panel 22. The bumper mounting bracket 24 is mounted on the lower portion of the second side panel connecting plate 222 to facilitate effective and tight connection between the rear floor rear cross member assembly structure 1 and the side panel D-pillar (not shown) of the vehicle.

[0082] It should be noted that the sizes of the above components are only used as an example and are not limited to these.

[0083] A second aspect of the present application provides a vehicle (not shown) comprising a vehicle body and the aforementioned rear floor and rear cross member assembly structure 1. In this design, a vehicle having the aforementioned rear floor and rear cross member assembly structure 1 can significantly improve the buffering and energy absorption capacity of the vehicle's rear end, effectively reduce vibration response sensitivity, and thereby reduce road noise, thereby effectively improving the NVH characteristics of the vehicle's rear end.

[0084] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0085] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A rear floor and rear cross beam assembly structure for a vehicle, characterized in that: include: Upper cross member sub-assembly, including the upper rear cross member and tailgate latch reinforcement plate; A lower crossbeam subassembly, comprising a lower rear crossbeam, wherein the lower rear crossbeam and the upper rear crossbeam enclose a cavity; a rear floor, the rear end of the rear floor being sandwiched between the upper rear cross beam and the lower rear cross beam, and the rear end of the rear floor being connected to the upper rear cross beam and the lower rear cross beam; The upper rear cross member includes an upper cross member body and a flange. The flange is closer to the rear floor than the upper cross member body and is bent and connected to the upper cross member body. The flange has a pre-installation area. The tailgate latch reinforcement plate is provided on a side of the flange facing the rear floor corresponding to the pre-installation area. The upper cross beam body includes a first plate, a second plate, and a plurality of first reinforcements, one side of the first plate is connected to the flange; the second plate is bent and connected to the side of the first plate facing away from the flange, and the second plate and the flange are respectively arranged on both sides of the first plate along the length direction of the vehicle; a plurality of first reinforcements are arranged on the first plate, and all the first reinforcements are spaced apart along the width direction of the vehicle; Among them, all the first reinforcements have different shapes; and / or, all the first reinforcements have different sizes; and / or, along the width direction of the vehicle, the distance between any two adjacent first reinforcements is not equal; and / or, one end of each first reinforcement extends to the connection between the first plate and the second plate, and the other end of each first reinforcement extends to the connection between the first plate and the flange.

2. The rear floor rear cross beam assembly structure according to claim 1, characterized in that: The flange, the tailgate lock reinforcement plate and the rear end of the rear floor are three-layered and welded together through a first welding point; the flange, the rear end of the rear floor and the lower rear cross beam are three-layered and welded together through a second welding point; the flange and the tailgate lock reinforcement plate are two-layered and welded together through a third welding point; the orthographic projections of the first welding point, the second welding point and the third welding point on the surface of the flange facing away from the rear floor fall within the pre-installation area.

3. The rear floor rear cross beam assembly structure according to claim 2, characterized in that: The flanging comprises: A flange body, bent and connected to the upper crossbeam body, and having the pre-installation area; a boss extending from the pre-installation area of the flange body in a direction away from the rear floor, the boss having a mounting surface facing away from the flange body, an orthographic projection of the mounting surface on a surface of the flange body facing away from the rear floor falling within the pre-installation area, the mounting surface being provided with at least one groove, the groove dividing the mounting surface into a first sub-surface and a second sub-surface located on either side of a notch of the groove; when the tailgate lock reinforcement plate is positioned on the upper rear cross beam, the notch of the tailgate lock reinforcement plate is aligned with the notch of the groove; The first welding point corresponds to the first sub-surface, the second welding point corresponds to the bottom wall of the groove, and the third welding point corresponds to the second sub-surface.

4. The rear floor rear cross beam assembly structure according to any one of claims 1 to 3, characterized in that: The upper crossbeam subassembly also includes: a first connecting plate; A second connecting plate, a surface of the second connecting plate and / or an edge of the second connecting plate is provided with a third reinforcement body, the second connecting plate has a first connecting end extending along the length direction of the vehicle, a second connecting end extending along the width direction of the vehicle, and a third connecting end extending along the height direction of the vehicle; the first connecting end is connected to the first connecting plate, the second connecting end is connected to the upper rear cross beam, and the third connecting end is used to be connected to the D-pillar inner panel of the vehicle.

5. The rear floor rear cross beam assembly structure according to claim 4, characterized in that: The lower crossbeam subassembly also includes a side panel connection plate; The first connecting plate has a first cross-section, the first cross-section being perpendicular to the height direction of the vehicle and being trapezoidal in shape; a side where the upper base of the first cross-section of the first connecting plate is located is connected to the side panel connecting plate, a side where the lower base of the first cross-section of the first connecting plate is located is connected to the rear floor, a side where the height of the first cross-section of the first connecting plate is located is connected to the second connecting plate, and a side where the oblique height of the first cross-section of the first connecting plate is located is used to connect to the rear wheelhouse inner panel of the vehicle; There are two first connecting plates, and the areas of the first cross sections of the two first connecting plates are not equal.

6. The rear floor rear cross beam assembly structure according to any one of claims 1 to 3, characterized in that: The lower rear cross member includes a first rear cross member, and the first rear cross member includes: a third plate body, one side of which is welded to the rear end of the rear floor; a fourth plate body, bent and connected to a side of the third plate body facing away from the rear floor; The fifth plate is bent and connected to the side of the fourth plate away from the third plate. The fifth plate and the third plate are located on the same side of the fourth plate, and the side of the fifth plate away from the fourth plate is connected to the upper rear cross beam.

7. The rear floor rear cross member assembly structure according to claim 6, characterized in that: The lower rear cross member further comprises: a second rear cross beam, one side of the second rear cross beam being connected to the fifth plate; A third rear cross beam, one side of the third rear cross beam is connected to the third plate body and the fourth plate body, and the other side of the third rear cross beam is connected to the other side of the second rear cross beam.

8. The rear floor rear cross member assembly structure according to claim 7, characterized in that: The lower cross member subassembly also includes a side panel connecting plate and a vehicle body suspension mounting plate; The second rear cross beam has a second cross section, the second cross section is perpendicular to the longitudinal direction of the vehicle, and the second cross section is trapezoidal; the side where the upper base of the second cross section of the second rear cross beam is located is connected to the fifth plate body, the side where the lower base of the second cross section of the second rear cross beam is located is connected to the side panel connecting plate, and the side where the height of the second cross section of the second rear cross beam is located is connected to the other side of the third rear cross beam and the vehicle body suspension mounting plate.

9. A vehicle, characterized in that: include: body; The rear floor rear cross beam assembly structure according to any one of claims 1 to 8, wherein the rear floor rear cross beam assembly structure is installed on the vehicle body.

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