An SUV stiffness enhancement structure and automobile

Abstract

This invention relates to the field of automotive body-in-white frame structure technology, and discloses an SUV stiffness enhancement structure and vehicle. A rear floor crossbeam is provided on the rear floor body. Both ends of the rear floor crossbeam are connected to the ends of the upper crossbeam of the rear shock absorber above it via rear shock absorber connecting plates, forming a closed-loop support structure, thereby improving the torsional stiffness and torsional mode of the body-in-white. A V-shaped support plate is provided between the rear floor crossbeam and the upper crossbeam of the rear shock absorber. The bent end of the V-shaped support plate is fixedly connected to the rear floor crossbeam, and both ends connect the ends of the rear shock absorber connecting plate and the upper crossbeam of the rear shock absorber body into a single structure. The V-shaped support plate combined with the closed-loop support structure provides a reasonable force path for the vehicle body, effectively suppressing torsional deformation, thereby improving the overall torsional stiffness and torsional mode of the vehicle, and effectively reducing rear-seat noise.

Description

Technical Field

[0001] This invention relates to the field of automotive body-in-white frame structure technology, and in particular to an SUV stiffness enhancement structure and an automobile. Background Technology

[0002] As electric vehicles gradually enter the market, the vehicle body frame structure is one of the key assemblies of the entire vehicle, serving as the carrier for the powertrain, chassis, and electrical equipment. Besides ensuring its aesthetic appearance, the body design must also meet requirements for layout, performance, manufacturing processes, and lightweighting. This presents a greater challenge to improving the torsional stiffness and torsional mode of the body-in-white. SUVs, compared to other vehicle types, need to adapt to more complex and harsh road conditions, with a high center of gravity and heavy loads, which places higher demands on torsional stiffness. If the torsional stiffness and torsional mode of the SUV's body-in-white are too low, the vehicle itself will experience significant NVH (Noise, Vibration, and Harshness) performance problems during operation. Fatigue cracking issues such as structural adhesive failure at joints, weld breakage, and weld fractures may occur between body structures. Simultaneously, the fit between body-in-white structures may be affected, leading to permanent body deformation and posing serious safety hazards to drivers and passengers.

[0003] To improve the torsional stiffness of the body-in-white frame structure of SUV models, some body-in-whites increase the sheet metal thickness, that is, thicken the sheet metal material at key structural points. However, this approach increases the overall vehicle weight, which is not in line with the current trend of lightweighting; on the other hand, it increases the manufacturing cost per vehicle and also affects the vehicle's range. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an SUV stiffness enhancement structure and vehicle that, without increasing sheet metal thickness, forms a closed-loop support structure through the design of connections between structures, thereby increasing body stiffness with minimal weight increase.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] Firstly, an SUV stiffness enhancement structure includes a rear floor body with a rear floor crossbeam on the rear floor body. The two ends of the rear floor crossbeam are connected to the two ends of the upper crossbeam of the rear shock absorber above it via a rear shock absorber connecting plate to form a closed-loop support structure. A V-shaped support plate is provided between the rear floor crossbeam and the upper crossbeam of the rear shock absorber. The bent end of the V-shaped support plate is fixedly connected to the rear floor crossbeam. The two ends connect the ends of the rear shock absorber connecting plate and the upper crossbeam of the rear shock absorber body into an integral structure.

[0007] By setting up a rear floor crossbeam, a rear shock absorber connecting plate, and a rear shock absorber upper crossbeam and connecting them into a closed-loop support structure, and installing a V-shaped support plate between the rear floor crossbeam and the rear shock absorber upper crossbeam, a reasonable force path is provided for the vehicle body. This can greatly improve the torsional stiffness and torsional mode of the body-in-white, and has a good effect on reducing rear-seat noise. Without increasing the sheet metal thickness, the rigidity of the vehicle body is improved with minimal weight increase by designing the connection relationship between the structures.

[0008] As a further implementation, the two ends of the crossbeam on the rear floor are respectively connected to the bottom ends of the left connecting plate and the right connecting plate of the rear shock absorber, and the top ends of the left connecting plate and the right connecting plate of the rear shock absorber are connected to the two ends of the upper crossbeam of the rear shock absorber.

[0009] As a further implementation, a diagonal brace is connected between the rear shock absorber connecting plate and the crossbeam on the rear floor near the end.

[0010] As a further implementation, the diagonal brace is a crossbeam connecting plate on the rear floor. One end of the crossbeam connecting plate is connected to the lap joint surface of the crossbeam near the end of the rear floor through a plug weld hole, and the other end is fixedly connected to the bolt hole on the rear shock absorber connecting plate through a bolt hole. The crossbeam connecting plate on the rear floor is provided with weight reduction holes.

[0011] As a further implementation, the lower overlapping surface of the crossbeam on the rear floor is overlapped with the rear floor body through welding points and structural adhesive, and the middle position of the crossbeam on the rear floor is bolted to the bottom bend of the V-shaped support plate through bolt holes.

[0012] As a further implementation, the left and right ends of the rear floor body are respectively provided with a left rear shock absorber and a right rear shock absorber. The middle position of the left connecting plate and the right connecting plate of the rear shock absorber is provided with a middle overlapping surface. The welding point and structural adhesive are overlapped with the corresponding shock absorber through the middle overlapping surface. The connecting plate of the rear shock absorber is provided with weight reduction holes.

[0013] As a further implementation, the top of the left connecting plate of the rear shock absorber is provided with an upper overlapping surface. The upper overlapping surface is used to overlap the lower overlapping surface of the upper inner plate of the left C-pillar with the weld point and structural adhesive. The upper overlapping surface is connected to the lower overlapping surface of the upper inner plate of the left C-pillar with the plug weld through the plug weld hole.

[0014] As a further implementation, the upper lap edge on the left side of the upper crossbeam of the rear shock absorber is welded to the lap surface of the inner plate of the left C-pillar.

[0015] As a further implementation, both the V-shaped support plate and the crossbeam on the rear floor are provided with rib structures.

[0016] Secondly, a type of automobile, wherein the automobile body-in-white adopts the SUV stiffness enhancement structure described above.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. This invention sets up a closed-loop support structure by setting up a rear floor crossbeam, a rear shock absorber connecting plate, and a rear shock absorber upper crossbeam, and connecting them. A V-shaped support plate is set between the rear floor crossbeam and the rear shock absorber upper crossbeam to provide a reasonable force path for the vehicle body, which can greatly improve the torsional stiffness and torsional mode of the body-in-white, and has a good effect on reducing the rear noise of the vehicle. Without increasing the sheet metal thickness, the rigidity of the vehicle body is improved with little weight increase by designing the connection relationship between the structures.

[0019] 2. The V-shaped support plate of this invention can reasonably distribute the force transmission path, avoid the problems of welding points, burning welding and structural adhesive fatigue cracking at the rear shock absorber, and also significantly improve NVH performance and the comfort of rear seat passengers.

[0020] 3. The present invention has a diagonal brace connecting the rear shock absorber connecting plate and the crossbeam on the rear floor near the end, which improves the connection strength between the structures.

[0021] 4. The present invention is provided with ribs and weight-reducing holes at corresponding positions. On the one hand, the ribs can effectively avoid the problem of fatigue cracking of the main structure. On the other hand, the setting of weight-reducing holes meets the development needs of lightweighting. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] Figure 1 This is a schematic diagram of the SUV stiffness enhancement structure in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the V-shaped support plate in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the upper crossbeam of the rear shock absorber in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the crossbeam on the rear floor in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the left connecting plate structure of the rear floor beam in an embodiment of the present invention.

[0028] Figure 6This is a schematic diagram of the structure of the left connecting plate of the rear shock absorber in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the right connecting plate structure of the rear floor crossbeam in an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the right connecting plate structure of the rear shock absorber in an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the inner plate structure on the left C-pillar in an embodiment of the present invention.

[0032] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0033] Wherein: 1-V-shaped support plate; 2-Upper crossbeam of rear shock absorber; 3-Left connecting plate of crossbeam on rear floor; 4-Left rear shock absorber; 5-Left connecting plate of rear shock absorber; 6-Inner plate of left C-pillar; 7-Crossbeam on rear floor; 8-Rear floor body; 9-Right connecting plate of rear shock absorber; 10-Right connecting plate of crossbeam on rear floor; 11-Right rear shock absorber;

[0034] 1-1-Plug weld hole, 1-2-Plug weld hole, 1-5-Plug weld hole, 1-6-Plug weld hole; 1-7-Rib; 1-3-Bolt hole, 1-4-Bolt hole; 1-8-Lower lap joint of V-shaped support plate; 1-9-Right lap joint of V-shaped support plate, 1-10-Left lap joint of V-shaped support plate;

[0035] 2-1-Exhaust port; 2-2-Right side overlap of the upper crossbeam of the rear shock absorber; 2-3-Upper left side overlap of the upper crossbeam of the rear shock absorber; 2-4-Lower left side overlap of the upper crossbeam of the rear shock absorber; 2-5-Right side overlap of the upper crossbeam of the rear shock absorber; 2-6-Left side overlap of the upper crossbeam of the rear shock absorber;

[0036] 3-1- Bolt hole, 3-2- Bolt hole; 3-3- Plug hole, 3-4- Plug hole; 3-5- Weight reduction hole;

[0037] 5-1-Lower lap joint surface of the left connecting plate of the rear shock absorber; 5-2-Bolt hole, 5-3-Bolt hole; 5-4-Lamb joint surface of the left connecting plate of the rear shock absorber; 5-5-Plug weld hole; 5-6-Vent hole; 5-7-Middle lap joint surface of the left connecting plate of the rear shock absorber; 5-8-Plug weld lap joint surface; 5-9-Firing weld lap joint surface;

[0038] 6-1- Lower lap joint surface of the upper inner panel of the left C-pillar; 6-2- Plug-welded lap joint surface of the upper inner panel of the left C-pillar; 6-3- Welded lap joint surface of the upper inner panel of the left C-pillar;

[0039] 7-1-Right side lap joint of the crossbeam on the rear floor; 7-2-Bolt hole, 7-3-Bolt hole; 7-4-Left side lap joint of the crossbeam on the rear floor; 7-5-Protruding rib; 7-6-Lower lap joint; 7-7-Middle lap joint of the crossbeam on the rear floor; 7-8-Left plug weld lap joint of the crossbeam on the rear floor; 7-9-Right plug weld lap joint of the crossbeam on the rear floor;

[0040] 9-1-Lower lap joint surface of the right connecting plate of the rear shock absorber; 9-2-Bolt hole, 9-3-Bolt hole; 9-4-Middle lap joint surface of the right connecting plate of the rear shock absorber; 9-5-Plug weld hole; 9-6-Weight reduction hole; 9-7-Plug weld lap joint surface; 9-8-Firing lap joint surface;

[0041] 10-1- Bolt hole, 10-2- Bolt hole; 10-3- Plug weld hole, 10-4- Plug weld hole; 10-5- Weight reduction hole. Detailed Implementation

[0042] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0043] As mentioned in the background section, in order to improve the torsional stiffness of the body-in-white frame structure of SUV models, some body-in-whites increase the sheet metal thickness, that is, thicken the sheet metal material at key structural points. However, this approach increases the overall vehicle weight, which is not in line with the current trend of lightweighting; on the other hand, it increases the manufacturing cost of a single vehicle and also affects the vehicle's range.

[0044] Example 1

[0045] In a typical embodiment of the present invention, reference is made to Figures 1-9 As shown, an SUV stiffness enhancement structure includes a V-shaped support plate 1, a rear shock absorber upper crossbeam 2, a left connection plate for the rear floor crossbeam 3, a left rear shock absorber 4, a left connection plate for the rear shock absorber 5, an inner plate on the left C-pillar 6, a rear floor crossbeam 7, a rear floor body 8, a right connection plate for the rear shock absorber 9, a right connection plate for the rear floor crossbeam 10, and a right rear shock absorber 11.

[0046] like Figure 1 As shown, the front end of the rear floor body is used to connect with the middle floor. The left rear shock absorber 4 is installed on the left side of the rear floor, and the right rear shock absorber 11 is installed on the right side. In order to improve the rigidity of the SUV, the structure of the rear floor part of the SUV is improved in this embodiment.

[0047] like Figure 1 and Figure 4As shown, a rear floor crossbeam 7 is provided on the rear floor body. Both ends of the rear floor crossbeam are connected to the ends of the upper rear shock absorber crossbeam above it via rear shock absorber connecting plates, forming a closed-loop support structure. A V-shaped support plate is provided between the rear floor crossbeam and the upper rear shock absorber crossbeam. The bent end of the V-shaped support plate is fixedly connected to the rear floor crossbeam, and both ends connect the ends of the rear shock absorber connecting plate and the upper rear shock absorber crossbeam body into a single structure. By setting a closed-loop support structure at the rear floor body, the torsional stiffness and torsional mode of the body-in-white are greatly improved.

[0048] like Figure 4 As shown, the structure of the crossbeam 7 on the rear floor includes:

[0049] The following are examples of lap joint surfaces on the rear floor: right side lap joint surface 7-1, bolt hole 7-2, bolt hole 7-3; left side lap joint surface 7-4; protruding rib 7-5, lower lap joint surface 7-6; middle lap joint surface 7-7; left side lap joint surface 7-8; right side lap joint surface 7-9. The two ends of the rear floor crossbeam extend upwards to the vibration damper to facilitate the proper arrangement of installation space for the rear floor structure.

[0050] like Figure 4 As shown, the lower overlapping surface 7-6 of the rear floor crossbeam 7 is overlapped with the rear floor body 8 by welding points and structural adhesive, thus fixing the rear floor crossbeam 7 to the rear floor body 8.

[0051] The middle position of the rear floor crossbeam 7 is the middle overlapping surface 7-7, and bolt holes 7-2 and 7-3 are provided on the middle overlapping surface 7-7. The lower overlapping surface 7-6 is located on the bottom surface of the rear floor crossbeam 7 between the middle overlapping surface 7-7 and the end of the rear floor crossbeam 7. The middle overlapping surface 7-7 is located on the top surface of the rear floor crossbeam 7 and is used to connect with the V-shaped support plate 1 above the rear floor crossbeam 7.

[0052] The top surfaces of the rear floor crossbeam 7 near both ends are the left welded lap surface 7-8 and the right welded lap surface 7-9 of the rear floor crossbeam. The two upward-bent ends are the right lap surface 7-1 and the left lap surface 7-4 of the rear floor crossbeam.

[0053] like Figure 1 As shown, the rear shock absorber connecting plate includes a left rear shock absorber connecting plate 5 and a right rear shock absorber connecting plate 9. The two ends of the rear floor crossbeam are connected to the two ends of the upper rear shock absorber crossbeam above it through the rear shock absorber connecting plate to form a closed-loop support structure. The two ends of the rear floor crossbeam are connected to the bottom ends of the left rear shock absorber connecting plate and the right rear shock absorber connecting plate, respectively. The top ends of the left rear shock absorber connecting plate and the right rear shock absorber connecting plate are connected to the two ends of the upper rear shock absorber crossbeam.

[0054] like Figure 6 As shown, the structure of the left connecting plate 5 of the rear shock absorber includes a lower overlapping surface 5-1, bolt holes 5-2 and 5-3, an upper overlapping surface 5-4, a plug weld hole 5-5, a vent hole 5-6, a middle overlapping surface 5-7, a plug weld overlapping surface 5-8, and a welded overlapping surface 5-9. The left connecting plate 5 of the rear shock absorber is generally L-shaped, with its bottom end being the lower overlapping surface 5-1.

[0055] Bolt holes 5-2 and 5-3 are located below the middle bend of the L-shaped left connecting plate 5 of the rear shock absorber. The top of the left connecting plate 5 is the overlapping surface 5-4, and a plug weld hole 5-5 is located at the overlapping surface 5-4. The vent hole 5-6 is located in the middle of the left connecting plate 5. The plug weld hole 5-5 is located near the top of the overlapping surface 5-9. The plug weld lap surface 5-8 is located in the middle of the left connecting plate 5. The middle overlapping surface 5-7 of the left connecting plate is located on the edge of the left connecting plate 5 in front of the plug weld lap surface 5-8.

[0056] like Figure 8 As shown, the structure of the right connecting plate 9 of the rear shock absorber is similar to that of the left connecting plate 5 of the rear shock absorber, and they have the same shape. The right connecting plate includes a lower overlapping surface 9-1, bolt holes 9-2 and 9-3, a middle overlapping surface 9-4, a plug weld hole 9-5, a weight reduction hole 9-6, a plug weld overlapping surface 9-7, and a brazed overlapping surface 9-8. The lower overlapping surface 9-1 of the right connecting plate is located at the bottom end of the right connecting plate 9.

[0057] The plug weld hole 9-5 is located at the top of the right connecting plate 9 of the rear shock absorber. The welded lap surface 9-8 is located near the top of the plug weld hole 9-5, and the welded lap surface 9-7 is located in front of the welded lap surface 9-8. The middle lap surface 9-4 of the right connecting plate of the rear shock absorber is arranged behind the welded lap surface 9-8 and extends along the rear edge of the right connecting plate 9 of the rear shock absorber for a set length. Bolt holes 9-2 and 9-3 are provided below the middle bent part of the L-shaped right connecting plate 9 of the rear shock absorber.

[0058] The lower overlapping surface 9-1 of the right connecting plate of the rear shock absorber is welded to the right overlapping surface 7-1 of the crossbeam on the rear floor and then bonded with structural adhesive. The lower overlapping surface 5-1 of the left connecting plate of the rear shock absorber is welded to the left overlapping surface 7-4 of the crossbeam on the rear floor and then bonded with structural adhesive, thereby achieving a fixed connection between both ends of the crossbeam 7 on the rear floor and the bottom end of the connecting plate of the rear shock absorber.

[0059] like Figure 3As shown, the structure of the upper crossbeam 2 of the rear shock absorber includes an exhaust port 2-1, a right side overlapping edge 2-2 of the upper crossbeam of the rear shock absorber, a left side upper overlapping edge 2-3 of the upper crossbeam of the rear shock absorber, a left side lower overlapping edge 2-4 of the upper crossbeam of the rear shock absorber, a right side overlapping surface 2-5 of the upper crossbeam of the rear shock absorber, and a left side overlapping surface 2-6 of the upper crossbeam of the rear shock absorber.

[0060] The right end of the upper crossbeam 2 of the rear shock absorber is the right side overlapping edge 2-2 of the upper crossbeam of the rear shock absorber. Near the right end, there is a right side overlapping surface 2-5 of the upper crossbeam of the rear shock absorber. Above it is an exhaust hole 2-1. The left end is the lower left side overlapping edge 2-4 of the upper crossbeam of the rear shock absorber. Near the left end, there is a lower left side overlapping surface 2-6 of the upper crossbeam of the rear shock absorber. The upper edge is the upper left side overlapping edge 2-3 of the upper crossbeam of the rear shock absorber.

[0061] The right side lap edge 2-2 of the upper crossbeam of the rear shock absorber is welded to the welded lap surface 9-8 in the right connecting plate of the rear shock absorber. The left side lower lap edge 2-4 of the upper crossbeam of the rear shock absorber is welded to the welded lap surface 5-9.

[0062] The two ends of the upper crossbeam 2 of the rear shock absorber are welded to the welded lap surface of the rear shock absorber connecting plate near the top. The bottom ends of the two rear shock absorber connecting plates are connected by the crossbeam on the rear floor, thus forming a closed-loop support structure, which greatly improves the torsional stiffness and torsional mode of the body-in-white.

[0063] The middle overlapping surface 5-7 of the left connecting plate of the rear shock absorber is welded to the left rear shock absorber 4 and overlapped with structural adhesive. Correspondingly, the middle overlapping surface 9-4 of the right connecting plate of the rear shock absorber is welded to the right rear shock absorber 11 and overlapped with structural adhesive.

[0064] To further improve the rigidity of the SUV, this embodiment adds a V-shaped support plate 1 to the aforementioned closed-loop support structure, such as... Figure 2 As shown, the structure of the V-shaped support plate 1 includes plug weld holes 1-1, 1-2, 1-5, 1-6, protruding ribs 1-7, bolt holes 1-3, bolt holes 1-4, lower overlapping surface of the V-shaped support plate 1-8, right overlapping surface of the V-shaped support plate 1-9, and left overlapping surface of the V-shaped support plate 1-10.

[0065] Specifically, the lower overlapping surface 1-8 of the V-shaped support plate is located in the middle of the V-shaped support plate 1, where bolt holes 1-3 and 1-4 are provided.

[0066] The right overlapping surface 1-9 and the left overlapping surface 1-10 of the V-shaped support plate are located at the right and left ends of the V-shaped support plate 1, respectively. Plug-in holes 1-1 and 1-2 are located at the right end of the V-shaped support plate, with plug-in hole 1-1 located in front of plug-in hole 1-2. Plug-in holes 1-5 and 1-6 are located at the left end of the V-shaped support plate, with plug-in hole 1-5 located in front of plug-in hole 1-6.

[0067] In order to fix the V-shaped support plate between the crossbeam on the rear floor and the upper crossbeam of the rear shock absorber, the middle overlapping surface 7-7 of the crossbeam on the rear floor is bolted to the bolt holes 1-3 and 1-4 of the lower overlapping surface 1-8 of the V-shaped support plate through bolt holes 7-2 and 7-3.

[0068] The plug-welded lap joint surface 5-8 of the left connecting plate of the rear shock absorber is plug-welded to the front plug-welded hole 1-5 of the left lap joint surface 1-10 of the V-shaped support plate. The left lap joint surface 2-6 of the upper crossbeam of the rear shock absorber is plug-welded to the plug-welded hole 1-6 of the left lap joint surface 1-10 of the V-shaped support plate.

[0069] The plug weld lap surface 9-7 of the right connecting plate of the rear shock absorber is plug welded to the plug weld hole 1-2 of the right lap surface 1-9 of the V-shaped support plate; the plug weld hole 1-1 of the right lap surface 1-9 of the V-shaped support plate is plug welded to the right lap surface 2-5 of the upper crossbeam of the rear shock absorber.

[0070] By incorporating a V-shaped support plate 1 within the closed-loop support structure, the torsional rigidity of the vehicle body is significantly increased, and the force transmission path is rationally distributed. Furthermore, it avoids issues such as weld point burn-out and structural adhesive fatigue cracking at the rear shock absorber. In addition, it significantly improves NVH (Noise, Vibration, Harshness) performance and the comfort of rear seat passengers. The entire support structure forms a complete closed-loop body torsional deformation, enhancing the overall torsional stiffness and torsional modes of the vehicle.

[0071] The entire SUV stiffness enhancement structure can form a complete closed loop (rear shock absorber left connecting plate 5 → rear floor crossbeam 7 → rear shock absorber right connecting plate 9 → rear shock absorber upper crossbeam 2 → rear shock absorber left connecting plate 5). A V-shaped support plate is added inside the closed loop structure to provide a reasonable force path for the vehicle body, effectively suppressing torsional deformation of the vehicle body, thereby improving the torsional stiffness and torsional mode of the whole vehicle, which has a good effect on reducing rear noise of the whole vehicle.

[0072] To further enhance rigidity, a diagonal brace is connected between the rear shock absorber connecting plate and the rear floor crossbeam 7 near its end. The diagonal brace is the rear floor crossbeam connecting plate, with one end connected to the plug-welded lap joint near the end of the rear floor crossbeam via a plug-welded hole, and the other end fixedly connected to the bolt holes on the rear shock absorber connecting plate via bolt holes. The rear floor crossbeam connecting plate includes a left connecting plate 3 and a right connecting plate 10.

[0073] like Figure 5As shown, the structure of the left connecting plate 3 of the crossbeam on the floor includes bolt holes 3-1, 3-2, plug weld holes 3-3, 3-4, and weight reduction holes 3-5. Bolt holes 3-1 and 3-2 are located at the top of the left connecting plate 3 of the crossbeam on the floor, plug weld holes 3-3 and 3-4 are located at the bottom of the left connecting plate 3 of the crossbeam on the floor, and weight reduction holes 3-5 are located in the middle of the left connecting plate 3 of the crossbeam on the floor.

[0074] like Figure 7 As shown, the structure of the right connecting plate 10 of the floor beam includes bolt holes 10-1, bolt holes 10-2, plug weld holes 10-3, plug weld holes 10-4, and weight reduction holes 10-5. Bolt holes 10-1 and 10-2 are located at the top of the right connecting plate 10 of the floor beam, plug weld holes 10-3 and 10-4 are located at the bottom of the right connecting plate 10 of the floor beam, and weight reduction holes 10-5 are located in the middle of the right connecting plate 10 of the floor beam.

[0075] Specifically, the left lap joint surface 7-8 of the rear floor crossbeam is lapped with the lap joint holes 3-3 and 3-4 of the left connecting plate 3 of the rear floor crossbeam; the right lap joint surface 7-9 of the rear floor crossbeam is lapped with the lap joint holes 10-3 and 10-4 of the right connecting plate of the rear floor crossbeam, thereby achieving a fixed connection between the bottom ends of the left connecting plate 3 and the right connecting plate 10 of the rear floor crossbeam and the position near the end of the rear floor crossbeam.

[0076] Bolt holes 3-1 and 3-2 at the top of the left connecting plate 3 of the rear floor crossbeam are bolted to bolt holes 5-2 and 5-3 of the left connecting plate 5 of the rear shock absorber. Bolt holes 10-1 and 10-2 on the right connecting plate 10 of the rear floor crossbeam are bolted to bolt holes 9-2 and 9-3 of the right connecting plate 9 of the rear shock absorber. This achieves a fixed connection between the top of the connecting plate of the rear floor crossbeam and the lower part of the middle bent section of the connecting plate of the rear shock absorber.

[0077] The rear floor crossbeam 7 is provided with raised ribs 7-5 along its length, which can effectively improve the torsional stiffness and torsional mode of the vehicle body. In addition, the raised ribs 1-7 are arranged along the length of the V-shaped support plate to improve the support strength and effectively avoid the fatigue cracking problem of the V-shaped support plate body.

[0078] like Figure 9 As shown, the structure of the upper inner panel 6 of the left C-pillar includes the lower lap joint surface 6-1 of the upper inner panel of the left C-pillar, the plug-welded lap joint surface 6-2 of the upper inner panel of the left C-pillar, and the burn-welded lap joint surface 6-3 of the upper inner panel of the left C-pillar.

[0079] The lower lap joint surface 6-1 of the upper inner panel of the left C-pillar is located at the middle of the bottom end of the upper inner panel 6 of the left C-pillar. The plug-welded lap joint surface 6-2 of the upper inner panel of the left C-pillar is located on both sides of the lower lap joint surface 6-1 of the upper inner panel 6 of the left C-pillar. The welded lap joint surface 6-3 of the upper inner panel of the left C-pillar is located near the bottom end of the upper inner panel 6 of the left C-pillar.

[0080] The top of the left connecting plate 5 of the rear shock absorber has an overlapping surface 5-4, which is used to weld and overlap with the lower overlapping surface 6-1 of the upper inner plate of the left C-pillar. The plug weld hole 5-5 at the overlapping surface 5-4 of the left connecting plate of the rear shock absorber is plug welded to the overlapping surface 6-2 of the upper inner plate of the left C-pillar at the lower overlapping surface 6-1. The upper overlapping edge 2-3 on the left side of the upper crossbeam of the rear shock absorber is welded to the overlapping surface 6-3 of the upper inner plate of the left C-pillar.

[0081] The plug weld hole 9-5 is used to connect to the inner plate on the right C-pillar (not shown in the figure). The weight reduction hole 9-6 is located in the middle of the right connecting plate 9 of the rear shock absorber and is used for weight reduction.

[0082] This embodiment cleverly arranges the crossbeams on the rear floor and the upper crossbeams of the rear shock absorbers, creating a significant height difference between them and the rear floor. This effectively improves the torsional stiffness, torsional mode, and local modal performance of the body-in-white. It also innovatively proposes a design scheme that combines roll-formed parts with the crossbeams and longitudinal beams, employing various connection technologies such as welding and bolts to make the product more competitive in the market.

[0083] Example 2

[0084] In a typical embodiment of the present invention, reference is made to Figures 1-9 As shown, a type of automobile has a body-in-white structure that adopts the SUV stiffness enhancement structure of Embodiment 1. This SUV stiffness enhancement structure can be applied to SUVs, MPVs, and other vehicle models. The SUV stiffness enhancement structure of Embodiment 1 is reliable in design and has a reasonable transmission path. It not only meets the requirements for NVH performance, strength fatigue, safety, layout, and manufacturing processes, but also has a high torsional stiffness cost-effectiveness ratio (torsional stiffness / weight), making it highly competitive in the market and suitable for mass production. It maximizes the improvement of rear NVH issues and vehicle stability.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stiffness-enhancing structure for an SUV, characterized in that, Includes a rear floor body, on which a rear floor upper crossbeam is provided. The two ends of the rear floor upper crossbeam are respectively connected to the two ends of the rear shock absorber upper crossbeam above it through a rear shock absorber connecting plate to form a closed-loop support structure. A V-shaped support plate is provided between the rear floor upper crossbeam and the rear shock absorber upper crossbeam. The bottom bend of the V-shaped support plate is fixedly connected to the rear floor upper crossbeam. The two ends connect the ends of the rear shock absorber connecting plate and the rear shock absorber upper crossbeam body into an integrated structure. The two ends of the rear floor crossbeam are respectively connected to the bottom ends of the left and right connecting plates of the rear shock absorber. The top ends of the left and right connecting plates of the rear shock absorber are connected to the two ends of the upper crossbeam of the rear shock absorber. A diagonal brace is connected between the rear shock absorber connecting plate and the rear floor crossbeam near the end. The diagonal brace is the rear floor crossbeam connecting plate. One end of the rear floor crossbeam connecting plate is connected to the plug weld lap surface of the rear floor crossbeam near the end through a plug weld hole, and the other end is fixedly connected to the bolt hole on the rear shock absorber connecting plate through a bolt hole. The rear floor crossbeam connecting plate is provided with weight reduction holes. The left connecting plate of the rear shock absorber is plugged and welded to the front plugged and welded hole of the left lap surface of the V-shaped support plate; the left lap surface of the upper crossbeam of the rear shock absorber is plugged and welded to the plugged and welded hole of the left lap surface of the V-shaped support plate; the right connecting plate of the rear shock absorber is plugged and welded to the plugged and welded hole of the right lap surface of the V-shaped support plate; the plugged and welded hole of the right lap surface of the V-shaped support plate is plugged and welded to the right lap surface of the upper crossbeam of the rear shock absorber.

2. The SUV stiffness enhancement structure according to claim 1, characterized in that, The lower overlapping surface of the crossbeam on the rear floor is connected to the rear floor body by welding points and structural adhesive. The middle position of the crossbeam on the rear floor is bolted to the bottom bend of the V-shaped support plate through bolt holes.

3. The SUV stiffness enhancement structure according to claim 1, characterized in that, The left and right rear dampers are respectively provided at the left and right ends of the rear floor body. The middle of the left connecting plate and the right connecting plate of the rear damper is provided with a middle overlapping surface. The weld point and structural adhesive are overlapped with the corresponding damper through the middle overlapping surface. The rear damper connecting plate is provided with weight reduction holes.

4. The SUV stiffness enhancement structure according to claim 3, characterized in that, The top of the left connecting plate of the rear shock absorber is provided with an upper overlapping surface. The upper overlapping surface is used to weld the lower overlapping surface of the upper inner plate of the left C-pillar with structural adhesive. The upper overlapping surface is connected to the lower overlapping surface of the upper inner plate of the left C-pillar with plug weld through the plug weld hole.

5. The SUV stiffness enhancement structure according to claim 4, characterized in that, The upper left lap edge of the rear shock absorber's upper crossbeam is welded to the lap surface of the upper inner plate of the left C-pillar.

6. The SUV stiffness enhancement structure according to claim 1, characterized in that, Both the V-shaped support plate and the crossbeam on the rear floor are provided with rib structures.

7. A car, characterized in that, The vehicle body-in-white adopts the SUV stiffness enhancement structure as described in any one of claims 1-6.

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