Rear floor skeleton beam assembly for a vehicle and vehicle

Abstract

The embodiment of the present application relates to the technical field of vehicle body structure, and discloses a rear floor framework beam assembly for a vehicle and the vehicle.The rear floor framework beam assembly for the vehicle comprises a rear floor framework main body, a structure reinforcing assembly and a beam reinforcing piece.The structure reinforcing assembly comprises a front patch plate and a rear patch plate, the front patch plate is arranged corresponding to the front section and the middle section of the first longitudinal beam and the second longitudinal beam, the rear patch plate is arranged corresponding to the rear section of the first longitudinal beam and the second longitudinal beam, and the structure reinforcing assembly and the rear floor framework main body are connected and formed through a hot stamping process.The two ends of the front cross beam are formed with a first notch in the vertical direction, and the beam reinforcing piece is filled in the first notch.In this way, the bottom material can be prevented from being pulled empty and thinned due to excessive flow to the side wall.Meanwhile, the two ends of the front cross beam and the connection positions of the first longitudinal beam and the second longitudinal beam are formed with a first notch, and the first notch can improve the stress distribution of the region during the hot stamping process, so that the risk of cracking is reduced.

Description

Technical Field

[0001] This invention relates to the field of vehicle body structure technology, and more specifically to a rear floor frame beam assembly for a vehicle and the vehicle itself. Background Technology

[0002] Currently, with the widespread adoption of new energy vehicles, users are increasingly demanding higher standards in terms of overall vehicle quality, performance, and price. As a core component of the vehicle's frame, the rear floor assembly connects to the front floor at the front, the rear apron at the rear, and the side panels on both sides, serving as a crucial force-transmitting and load-bearing structure. Simultaneously, as the mounting platform for key components such as the rear suspension, motor, rear seats, and seatbelts, the rear floor frame itself must possess high strength and rigidity to meet structural durability and safety requirements under various operating conditions. Therefore, achieving a balance between lightweight design, high performance, and low cost has become a common challenge in vehicle body development in the era of new energy vehicles.

[0003] In vehicle body lightweighting research, the application of thermoforming materials is an effective way to achieve lightweighting. Integrated thermoforming processes can combine multiple parts into a single unit, achieving structural lightweighting while reducing the number of parts and welding processes, thus improving production efficiency and dimensional accuracy. However, integrated thermoformed parts still face many technological limitations in actual production. Specifically, when the vertical height of the rear floor frame is too large, the sheet metal flow path in the deep cavity area of ​​its longitudinal beams is long and the replenishment is not smooth during hot stamping. The bottom material is easily overstretched towards the sidewalls, leading to local thinning or even cracking at the bottom of the longitudinal beams. Simultaneously, due to the large vertical depth of the deep cavity sidewalls, the sheet metal undergoes significant tensile deformation while covering the entire cavity height. In the connection area between the crossbeams and longitudinal beams, due to the abrupt change in cross-sectional shape, the local material is subjected to multi-directional tension, easily leading to stress concentration, which seriously affects the structural quality and durability of the rear floor frame. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this application is to provide a rear floor frame beam assembly for vehicles, which aims to solve the technical problems in the prior art where the deep cavity area of ​​the longitudinal beam of the integral thermoformed rear floor frame is thinned or even cracked at the bottom due to the long flow path of the sheet metal and poor replenishment during hot stamping, and the front crossbeam end has a large vertical height. If it is directly stamped into a complete facade, the material flow path in this area changes sharply during the forming process, and the material is subjected to multi-directional stretching, which easily leads to excessive thinning and cracking.

[0005] In a first aspect, embodiments of this application provide a rear floor frame beam assembly for a vehicle. The rear floor frame beam assembly for a vehicle includes a rear floor frame main body, a structural reinforcement assembly, and beam reinforcement pieces. The rear floor frame main body has a front crossbeam, a middle crossbeam, a rear crossbeam, a first longitudinal beam, and a second longitudinal beam. The front crossbeam, the middle crossbeam, and the rear crossbeam are spaced apart along the length of the vehicle. The first longitudinal beam and the second longitudinal beam are respectively connected to the two ends of the front crossbeam, the middle crossbeam, and the rear crossbeam. The structural reinforcement assembly includes a front patch plate and a rear patch plate. The front patch plate is positioned corresponding to the front and middle sections of the first and second longitudinal beams, and the rear patch plate is positioned corresponding to the rear sections of the first and second longitudinal beams. The structural reinforcement assembly is connected to the rear floor frame main body and formed by a hot stamping process. A first notch is formed at both ends of the front crossbeam in the vertical direction, and the beam reinforcement piece fills the first notch.

[0006] The rear floor frame beam assembly for vehicles disclosed in this application utilizes front and rear patch plates corresponding to the front, middle, and rear sections of the first and second longitudinal beams, respectively. These structural reinforcement components are pre-connected to the rear floor frame body and then hot-stamped together. During hot stamping, the front and rear patch plates adhere to the bottom of the first and second longitudinal beams, increasing the flow resistance of the material in the bottom area and slowing the rate at which the bottom material flows towards the sidewalls, thus preventing the bottom material from being stretched and thinned due to excessive flow towards the sidewalls. Simultaneously, a first notch is formed at the connection points between the two ends of the front crossbeam and the first and second longitudinal beams. This first notch improves the stress distribution in this area during hot stamping, avoiding localized stress concentration caused by abrupt changes in cross-sectional shape, thereby reducing the risk of cracking. Furthermore, by filling the first notch with beam reinforcement components, the structural integrity of the connection area between the front crossbeam and the first and second longitudinal beams can be maintained, ensuring the continuity of force transmission and load-bearing reliability of the rear floor frame body when transmitting lateral loads and longitudinal torsion. Thus, the rear floor frame beam assembly of this application retains the lightweight advantages of integrated thermoforming while effectively avoiding the defects of stamping cracking in the deep cavity area and weak structure in the connection area. Under the premise of ensuring structural quality and durability, it achieves an effective balance between lightweight, high performance and structural strength.

[0007] In some embodiments, the rear floor frame beam assembly for a vehicle further includes a front section of a rear floor side beam. The outer sides of the front sections of the first and second longitudinal beams are respectively provided with first contact surfaces. One end of the front section of the rear floor side beam is fixedly connected to the first contact surface, and the other end is used to fixably connect to the vehicle's sill beam. This configuration, by providing first contact surfaces on the outer sides of the front sections of the first and second longitudinal beams, allows one end of the front section of the rear floor side beam to be fixedly connected to the first contact surface, while the other end connects to the sill beam of the corresponding vehicle model. Thus, the front section of the rear floor side beam serves as a connecting transition between the rear floor frame body and the sill beam. By replacing the front section of the rear floor side beam with one adapted to the sill beam of different vehicle models, the rear floor frame body can be adapted to the sill beams of different models without needing to redesign the rear floor frame body for each vehicle model, effectively improving the applicability and versatility of the rear floor frame body.

[0008] In some embodiments, the rear floor frame beam assembly for a vehicle further includes a rear wheel hump connecting plate. The outer sides of the middle sections of the first and second longitudinal beams are respectively provided with second contact surfaces. One end of the rear wheel hump connecting plate is fixedly connected to the second contact surface, and the other end is used to fixably connect to the side panel assembly of the vehicle. This configuration, by providing second contact surfaces on the outer sides of the middle sections of the first and second longitudinal beams, allows one end of the rear wheel hump connecting plate to be fixedly connected to the second contact surface, while the other end connects to the side panel assembly of the corresponding vehicle model. Thus, the rear wheel hump connecting plate serves as a connecting transition piece between the rear floor frame body and the side panel assembly. By replacing the rear wheel hump connecting plate with one adapted to the side panel assembly of different vehicle models, the rear floor frame body can be adapted to the side panel assemblies of different models without requiring a redesign of the rear floor frame body for each model, further improving the applicability and versatility of the rear floor frame body.

[0009] In some embodiments, the rear floor frame beam assembly for the vehicle further includes a rear section of a rear floor side beam. The inner sides of the rear sections of the first and second longitudinal beams are respectively provided with multiple third contact surfaces. One end of the rear section of the rear floor side beam is fixedly connected to each of the multiple third contact surfaces, and the other end is used for fixed connection to the rear skirt assembly of the vehicle. This configuration, by providing multiple third contact surfaces on the inner sides of the rear sections of the first and second longitudinal beams, allows the rear section of the rear floor side beam to be fixedly attached to the rear floor frame body on multiple surfaces, effectively improving the connection strength and positioning accuracy between the two. Furthermore, as a connecting transition component between the rear floor frame body and the rear skirt assembly, the rear section of the rear floor side beam, by replacing it with a rear section adapted to the rear skirt assembly of different vehicle models, allows the rear floor frame body to be adapted to the rear skirt assemblies of different models, eliminating the need to redesign the rear floor frame body for each vehicle model, significantly improving the applicability and versatility of the rear floor frame body.

[0010] In some embodiments, support members and lifting lug assemblies are respectively provided at the connection points of the first and second longitudinal beams and the middle crossbeam. The first and second longitudinal beams each have a beam body. The support member is fixedly connected to the inner side of the beam body, and the lifting lug assembly is fixedly connected to the outer side of the beam body. First chambers are formed between the support member and the beam body, and between the beam body and the lifting lug assembly. This configuration, by providing support members and lifting lug assemblies at the connection points of the first and second longitudinal beams and the middle crossbeam, allows the support member to be fixed to the inner side of the beam body and the lifting lug assembly to be fixed to the outer side of the beam body. This creates first chambers between the support member and the beam body, and between the beam body and the lifting lug assembly, respectively. This provides a double-layered closed chamber structure for the front mounting point of the rear subframe, effectively improving the local stiffness and load-bearing capacity of the front mounting point area. Furthermore, the construction of a high-strength mounting point is completed using only a small number of parts, reducing the number of parts, lowering the complexity of the welding process, and helping to control manufacturing costs.

[0011] In some embodiments, the lifting lug assembly includes a first connector, a second connector, and a first fastener. The second connector is fixedly connected to the first connector, and the first fastener is fixedly connected to the second connector. The first fastener penetrates the beam body and the support member, and is fixedly connected to both the beam body and the support member respectively. With this configuration, the lifting lug assembly can consist of the first connector, the second connector, and the first fastener. The first fastener can penetrate the beam body and the support member and be fixedly connected to both, allowing the load at the front mounting point of the rear subframe to be directly transferred to the beam body and the support member through the first fastener. This effectively improves the load transfer efficiency and ensures the local structural strength of the rear floor frame.

[0012] In some embodiments, a second notch is formed in the middle section of the first and second longitudinal beams, respectively. A support assembly is provided at the second notch, covering the second notch and fixedly connected to the first and second longitudinal beams. This arrangement, by forming a second notch in the middle section of the first and second longitudinal beams and providing a support assembly to cover and fix the second notch, not only provides an installation position for the rear shock absorber, allowing it to pass through the second notch for installation, but also allows the support assembly to cover and fill the second notch, thus completing the structural gap in the middle section of the first and second longitudinal beams. This ensures the structural continuity and load-bearing capacity of the first and second longitudinal beams at the second notch, preventing a decrease in local stiffness of the first and second longitudinal beams due to the second notch.

[0013] In some embodiments, the support assembly includes a first support plate, a second support plate, and a third support plate. The second support plate and the third support plate cooperate to form a sidewall structure. The first support plate covers the sidewall structure and is fixedly connected to the second and third support plates. This configuration allows the second and third support plates to enclose and form the sidewall structure, with the first support plate covering the sidewall structure and fixedly connected to the second and third support plates, thus forming a box-shaped support assembly. This allows the support assembly to cover the second notch while maintaining high structural rigidity and strength.

[0014] In some embodiments, reinforcing plates are respectively provided at the connection points of the first and second longitudinal beams with the rear crossbeam. The reinforcing plates cover and are fixedly connected to the first and second longitudinal beams, forming a second chamber between the reinforcing plates and the first and second longitudinal beams. This arrangement, by providing reinforcing plates at the connection points of the first and second longitudinal beams with the rear crossbeam, and by having the reinforcing plates cover and form a second chamber between them, enhances the structural strength of the rear sections of the first and second longitudinal beams, provides a closed cavity structure for the rear mounting point of the rear subframe, and effectively improves the local stiffness and load-bearing capacity of the rear mounting point area of ​​the rear subframe.

[0015] In some embodiments, the rear floor frame beam assembly for the vehicle further includes a second fastener corresponding to the reinforcing plate. One end of the second fastener is fixedly connected to the rear patch plate, and the other end of the second fastener passes through the reinforcing plate and is fixedly connected thereto. This configuration allows one end of the second fastener to be fixedly connected to the rear patch plate, and the other end to pass through the reinforcing plate and be fixedly connected thereto, thus providing support for the upper and lower ends of the second chamber, further ensuring the overall structural strength and rigidity of the rear subframe mounting point area.

[0016] In some embodiments, a first connecting hole is provided on the bottom of the front crossbeam, and a second connecting hole is provided on the bottom of the middle crossbeam. The first and second connecting holes are used to install a third fastener connected to the vehicle's fuel tank. This configuration, by providing the first connecting hole on the bottom of the front crossbeam and the second connecting hole on the bottom of the middle crossbeam, allows the first and second connecting holes to mate and accommodate fuel tanks of different sizes. This enables the rear floor frame to adapt to the fuel tank installation requirements of different vehicle models, eliminating the need to redesign the floor frame for different fuel tanks, further improving the versatility and applicability of the rear floor frame.

[0017] In some embodiments, the rear floor frame beam assembly for the vehicle further includes a rear floor front reinforcing crossbeam fixedly connected to the front crossbeam. The rear floor front reinforcing crossbeam is equipped with a seat mounting bracket for mounting the vehicle's rear seats. This configuration allows the rear floor front reinforcing crossbeam to be fixedly connected to the front crossbeam, enhancing the structural rigidity of the front crossbeam and providing a supporting foundation for the installation of the rear seats. Furthermore, by replacing different types of seat mounting brackets, installation adaptation for rear seats in different vehicle models can be achieved, eliminating the need to design separate rear floor front reinforcing crossbeams for different models and effectively reducing the development cost of the rear floor front reinforcing crossbeam.

[0018] Secondly, embodiments of this application also provide a vehicle. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0020] Figure 1 The three-dimensional representation of the rear floor frame beam assembly for a vehicle disclosed in this application. Figure 1 (Excluding beam replacement parts); Figure 2 The three-dimensional representation of the rear floor frame beam assembly for a vehicle disclosed in this application. Figure 2 (Including support components, lifting lug assemblies, and bracket assemblies, etc.); Figure 3 This is an exploded view (including support members, lug assemblies, and bracket assemblies, etc.) of the rear floor frame beam assembly for a vehicle disclosed in an embodiment of this application. Figure 4 The three-dimensional representation of the rear floor frame beam assembly for a vehicle disclosed in this application. Figure 3 (Including the front section of the rear floor side beam, the rear wheel bulge connecting plate, and the front end of the rear section of the rear floor side beam, etc.) Figure 5This is a perspective view of the assembly of the rear floor frame beam assembly for a vehicle disclosed in this application with the front section of the rear floor side beam, the rear wheel hump connecting plate, and the front end of the rear section of the rear floor side beam. Figure 6 For the corresponding Figure 2 Sectional view of section line AA in the middle; Figure 7 For the corresponding Figure 2 Sectional view of the BB section line; Figure 8 For the corresponding Figure 2 Sectional view of the FF section line; Figure 9 For the corresponding Figure 2 A sectional view of the CC section line; Figure 10 This is an exploded view of the lug assembly disclosed in the embodiments of this application; Figure 11 For the corresponding Figure 2 A sectional view of the DD section line in the middle; Figure 12 This is an exploded view of the support assembly disclosed in the embodiments of this application; Figure 13 For the corresponding Figure 2 A sectional view of the EE section line; Figure 14 This is a cross-sectional view of the rear floor frame beam assembly for a vehicle, as disclosed in an embodiment of this application, assembled with the front reinforcing crossbeam of the rear floor.

[0021] Explanation of reference numerals in the attached figures: 1. Rear floor frame main body; 11. Front crossbeam; 111. First notch; 112. First connecting hole; 12. Middle crossbeam; 121. Second connecting hole; 122. Third fastener; 13. Rear crossbeam; 14. First longitudinal beam; 15. Second longitudinal beam; 151. Beam body; 152. Second notch; 16. First mating surface; 17. Second mating surface; 18. Third mating surface; 2. Structural reinforcement components; 21. Front patch plate; 22. Rear patch plate; 3. Beam reinforcement; 41. Front section of rear floor side beam; 42. Rear wheel bulge connecting plate; 43. Rear section of rear floor side beam; 5. 6. Support component; 6. Hanger assembly; 61. First connector; 62. Second connector; 63. First fastener; 64. First chamber; 7. Bracket assembly; 71. First bracket plate; 72. Second bracket plate; 73. Third bracket plate; 8. Reinforcing plate; 81. Second chamber; 82. Second fastener; 91. Rear floor front reinforcing crossbeam; 911. Seat mounting bracket; 92. Fuel tank; 93. Side panel assembly; 94. Rear floor front section assembly; 95. Rear floor rear section assembly; 96. Rear subframe front mounting point; 97. Rear subframe rear mounting point; 98. Rear shock absorber. Detailed Implementation

[0022] The terms "first," "second," etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Directional terms used in this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," are merely for reference to the orientation shown in the accompanying drawings. The use of directional terms is for better and clearer explanation and understanding of this application, and does not indicate the orientation of the referred device or component in an actual application scenario.

[0023] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the two parts can rotate relative to each other after connection. "Sliding connection" refers to a connection where the two parts can slide relative to each other after connection.

[0024] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0025] The terms "parallel" and "perpendicular" are relative to the current technological level, not absolute mathematical definitions. Slight deviations are permissible; approximations of parallelism or perpendicularity are acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, with the angle between them ranging from 0 to 5 degrees. Similarly, "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, with the angle between them ranging from 85 to 95 degrees.

[0026] The embodiments of this application are described below with reference to the accompanying drawings.

[0027] like Figures 1 to 3As shown, a rear floor frame beam assembly for a vehicle includes a rear floor frame main body 1, a structural reinforcement assembly 2 and a beam reinforcement piece 3. The rear floor frame main body 1 has a front cross member 11, a middle cross member 12, a rear cross member 13, a first longitudinal beam 14 and a second longitudinal beam 15. The front cross member 11, the middle cross member 12 and the rear cross member 13 are arranged at intervals along the length direction of the vehicle. The first longitudinal beam 14 and the second longitudinal beam 15 are respectively connected to both ends of the front cross member 11, the middle cross member 12 and the rear cross member 13. The structural reinforcement assembly 2 includes a front patch plate 21 and a rear patch plate 22. The front patch plate 21 is arranged corresponding to the front section and the middle section of the first longitudinal beam 14 and the second longitudinal beam 15, and the rear patch plate 22 is arranged corresponding to the rear section of the first longitudinal beam 14 and the second longitudinal beam 15. After the structural reinforcement assembly 2 is connected with the rear floor frame main body 1, they are formed through a hot stamping process. First notches 111 are formed at both ends of the front cross member 11 in the vertical direction, and the beam reinforcement pieces 3 are filled in the first notches 111.

[0028] When the floor frame main body and the structural reinforcement assembly 2 are not formed by the hot stamping process and are still in the sheet material state, the sheet material for manufacturing the structural reinforcement assembly 2 can be placed above the sheet material for manufacturing the rear floor frame main body 1, and the two can be fixedly connected by a welding connection method, and then the hot stamping process can be adopted, so as to form an integrated structure of the rear floor frame main body 1 and the structural reinforcement assembly 2.

[0029] As Figure 1 shown, the rear floor frame beam formed by the hot stamping process may include a front cross member 11, a middle cross member 12, a rear cross member 13, a first longitudinal beam 14 and a second longitudinal beam 15. The front cross member 11, the middle cross member 12 and the rear cross member 13 are arranged at intervals along the length direction of the vehicle, and each cross member extends along the width direction of the vehicle. The first longitudinal beam 14 and the second longitudinal beam 15 are respectively arranged on the left and right sides of the rear floor frame main body 1, and extend along the length direction of the vehicle. The first longitudinal beam 14 and the second longitudinal beam 15 are respectively connected to the left and right ends of the front cross member 11, the middle cross member 12 and the rear cross member 15, so that the three are connected as a whole through the longitudinal beams, forming a "日"-shaped structure as a whole. In this "日"-shaped structure, the two longitudinal beams and the three cross members are integrated at the intersections to form two closed frame units arranged in sequence along the length direction of the vehicle. This closed frame structure significantly improves the overall torsional stiffness and bending stiffness of the rear floor frame main body 1. Moreover, compared with the traditional sheet metal tailor-welded structure of "two longitudinal beams + three cross members", the present application eliminates the welding joints at the intersections of the cross members and the longitudinal beams, eliminates the weakening of material properties caused by the welding heat-affected zone, and avoids the cumulative dimensional tolerance caused by tailor welding of multiple parts, which is beneficial to improving the dimensional accuracy and assembly consistency of the rear floor frame main body 1.

[0030] As Figure 6As shown, the cross-sectional shape of the front crossbeam 11 can be "Z" shaped. The height of the "Z" shaped front crossbeam 11 can be 150 mm to 170 mm. Its lower end plane can serve as the main load-bearing surface of the front crossbeam 11 to bear the load of the vehicle's fuel tank strap. The draft angle of the middle slope of the "Z" shaped front crossbeam 11 can be 25 degrees to 30 degrees. This draft angle range facilitates the smooth demolding of the front crossbeam 11 after hot stamping, avoiding interference or damage to the mold. The upper end plane of the "Z" shaped front crossbeam 11 can serve as a reserved welding edge for overlapping with the front reinforcing crossbeam 91 of the vehicle's rear floor and the front section assembly 94 of the vehicle's rear floor, thereby achieving a fixed connection between the three components through welding.

[0031] like Figure 6 As shown, the cross-sectional shape of the middle crossbeam 12 can be "U" shaped. The draft angle of the middle crossbeam 12 facing the wall of the front crossbeam 11 (i.e., the first front wall) can range from 15 degrees to 25 degrees, and the draft angle of the middle crossbeam 12 facing the wall of the rear crossbeam 13 (i.e., the first rear wall) can also range from 15 degrees to 25 degrees. This draft angle range allows the middle crossbeam 12 to be smoothly ejected from the mold after hot stamping, avoiding interference or tearing with the mold. The radius of the fillet at the connection between the first front wall and the middle section of the first longitudinal beam 14 and the side elevation of the middle section of the second longitudinal beam 15 is 140 mm to 160 mm. The radius of the fillet at the connection between the first rear wall and the middle section of the first longitudinal beam 14 and the side elevation of the middle section of the second longitudinal beam 15 can also be 180 mm to 190 mm. This fillet structure can eliminate the sharp corner at the intersection of the middle crossbeam 12 and the longitudinal beam, which helps to avoid cracking in this area due to the rapid material turning during hot stamping, and at the same time reduces the stress concentration at the intersection during vehicle operation. The horizontal portion of the middle area of ​​the "U"-shaped middle crossbeam 12 can be used to mate with the plane at the lower end of the front crossbeam 11 to bear the load of the vehicle's fuel tank strap. The first front wall of the aforementioned middle crossbeam 12 can extend to form a flat stop, the extension length of which can range from 18 mm to 25 mm, for bonding and welding with the front end face of the rear floor front assembly 94. The first rear wall surface of the aforementioned middle crossbeam 12 may extend to form a beveled stop, the extension length of which may range from 16 mm to 24 mm, for bonding and welding with the rear end face of the rear floor front assembly 94.

[0032] like Figure 6As shown, the cross-sectional shape of the rear crossbeam 13 can be U-shaped. The draft angle of the U-shaped rear crossbeam 13 facing the wall of the middle crossbeam 12 (i.e., the second front wall) can range from 15 degrees to 25 degrees, and the draft angle of the rear crossbeam 13 away from the middle crossbeam 12 (i.e., the second rear wall) can also range from 15 degrees to 25 degrees. This draft angle range allows the rear crossbeam 13 to be smoothly ejected from the mold after hot stamping, avoiding interference or tearing with the mold. The radius of the fillet at the connection between the second front wall and the rear section of the first longitudinal beam 14 and the side elevation of the rear section of the second longitudinal beam 15 is 190 mm to 210 mm, and the radius of the fillet at the connection between the second rear wall and the rear section of the first longitudinal beam 14 and the side elevation of the rear section of the second longitudinal beam 15 is 140 mm to 160 mm. This fillet structure can eliminate the sharp corner at the intersection of the rear crossbeam 13 and the longitudinal beam, which helps to avoid cracking in this area due to the rapid material turning during hot stamping, and at the same time reduces the stress concentration at the intersection during vehicle operation. The second front wall and the second rear wall of the aforementioned rear crossbeam 13 can each extend to form a flat stop, and the extension length of the flat stop can be in the range of 12 mm to 20 mm. The flat stop formed by the extension of the second front wall can be used for bonding and welding with the rear section assembly of the rear floor. The flat stop formed by the extension of the second rear wall can be used for bonding and welding with the rear end edge of the front section assembly 94 of the vehicle's rear floor and the front end edge of the rear section assembly 95 of the vehicle's rear floor.

[0033] The aforementioned first longitudinal beam 14 and second longitudinal beam 15 can be divided into front, middle, and rear sections along the length of the vehicle, such as... Figure 1 As shown, two front patch plates 21 can be respectively disposed on the inner sides of the front and middle sections of the first longitudinal beam 14 and the second longitudinal beam 15, and two rear patch plates 22 can be respectively disposed on the inner sides of the rear sections of the first longitudinal beam 14 and the second longitudinal beam 15. In this way, the first longitudinal beam 14 and the second longitudinal beam 15 can both obtain structural reinforcement in the length direction of the vehicle.

[0034] like Figures 1 to 4 As shown, the cross-sectional shape of the first longitudinal beam 14 and the second longitudinal beam 15 can be "U" shaped. The "U" shaped first longitudinal beam 14 and the second longitudinal beam 15 respectively have an inner wall surface near the rear floor frame body 1 and an outer wall surface away from the rear floor frame body 1. The draft angle of the inner wall surface can range from 25 degrees to 35 degrees, which facilitates smooth demolding of the inner sides of the first longitudinal beam 14 and the second longitudinal beam 15 after hot stamping, reducing the occurrence of adhesion to the mold. The draft angle of the outer wall surface can range from 1 degree to 5 degrees, which facilitates welding connections with components such as the front section 41 of the rear floor side beam and the rear wheel bulge connecting plate 42 (the front section 41 of the rear floor side beam and the rear wheel bulge connecting plate 42 are described in detail below).

[0035] like Figure 1as shown, two ends of the front cross member 11 are reserved with first notches 111 in the vertical direction. During the hot stamping forming process, if the end of the front cross member 11 is directly stamped and formed into a complete vertical facade, the material in this region will be excessively stretched during forming, which is highly prone to cracking defects. Therefore, by reserving the first notches 111 at the two ends of the front cross member 11 during forming, the material in this region can obtain sufficient flow space during the stamping process, avoiding cracking caused by restricted material flow. A beam patch 3 can be welded and connected at the first notch 111 to fill the vertical structures at the two ends of the front cross member 11. It can be understood that since the entire rear floor frame main body 1 may be in the shape of a Chinese character "日", the material corresponding to the hollow portion thereof will be cut off in the stamping and blanking stage. To improve material utilization, the material cut off from the hollow portion can be used to manufacture the beam patch 3, which effectively improves the material utilization rate and reduces the manufacturing cost of the beam patch 3.

[0036] In the rear floor frame beam assembly for a vehicle of the present application, by respectively arranging the front patch plate 21 and the rear patch plate 22 correspondingly at the front section, the middle section and the rear section of the first longitudinal beam 14 and the second longitudinal beam 15, the structural reinforcement assembly 2 and the rear floor frame main body 1 are connected in advance and then subjected to hot stamping forming together. During the hot stamping process, the front patch plate 21 and the rear patch plate 22 are attached to the bottoms of the first longitudinal beam 14 and the second longitudinal beam 15, which increases the flow resistance of the material in the bottom region, slows down the replenishment speed of the bottom material toward the side wall, thereby preventing the bottom material from being pulled empty and thinned due to excessive flow toward the side wall. At the same time, first notches 111 are formed at the connections between the two ends of the front cross member 11 and the first longitudinal beam 14 and the second longitudinal beam 15. The first notches 111 can improve the stress distribution in this region during the hot stamping process, avoid local stress concentration caused by sharp changes in the cross-sectional shape, thereby reducing the risk of cracking. Moreover, by filling the beam patch 3 into the first notch 111, the structural integrity of the connection region between the front cross member 11 and the first longitudinal beam 14 and the second longitudinal beam 15 can be completed, ensuring the force transmission continuity and load-bearing reliability of the rear floor frame main body 1 when transmitting lateral loads and longitudinal torsion. In this way, the rear floor frame beam assembly of the present application not only retains the lightweight advantage of integral hot forming, but also effectively avoids the defects of stamping cracking in the deep cavity region and weak structure in the connection region, achieving an effective balance among lightweight, high performance and structural strength on the premise of ensuring structural quality and durability.

[0037] In some embodiments, such as Figure 4 and Figure 5 as shown, the rear floor frame beam assembly for a vehicle further includes a front section 41 of the rear floor side beam. The outer sides of the front sections of the first longitudinal beam 14 and the second longitudinal beam 15 are respectively provided with a first fitting surface 16. One end of the front section 41 of the rear floor side beam is fixedly connected to the first fitting surface 16, and the other end of the front section 41 of the rear floor side beam is used for fixedly connecting with the sill beam of the vehicle.

[0038] Since the cross-sectional shape of the first longitudinal beam 14 and the second longitudinal beam 15 after stamping can be "U"-shaped, the first longitudinal beam 14 and the second longitudinal beam 15 can have an inner side and an outer side. The inner side can be understood as the concave side of the "U"-shaped structure, that is, the side where the internal space of the first longitudinal beam 14 and the second longitudinal beam 15 is located, and the outer side can be understood as the convex side of the "U"-shaped structure, that is, the side where the bottom of the first longitudinal beam 14 and the second longitudinal beam 15 is located.

[0039] One end of the aforementioned rear floor side beam front section 41 can be welded to the first mating surface 16, while the other end can be fixedly connected to the vehicle's sill beam. The sill beam can be located at the lower part of the vehicle's side panel and extends along the vehicle's length, forming both the support structure for the lower edge of the door and the main path for transmitting side impact force during a side collision, thus playing a crucial role in load-bearing and force transmission within the vehicle's structure. Sill beams of different vehicle models vary in cross-sectional shape and size. Therefore, by replacing the rear floor side beam front section 41 with one adapted to the sill beam of different vehicle models, the rear floor frame body 1 can be adapted to the sill beams of different models.

[0040] It should be noted that the different vehicle models mentioned in the article are not limited to vehicle types (such as sedans and urban SUVs), but can also refer to vehicles with different power forms such as pure electric vehicles, hybrid vehicles, range-extended electric vehicles, and plug-in hybrid vehicles.

[0041] In the above embodiment, by providing a first contact surface 16 on the outer side of the front section of the first longitudinal beam 14 and the second longitudinal beam 15, one end of the front section 41 of the rear floor side beam can be fixedly connected to the first contact surface 16, and the other end is connected to the sill beam of the corresponding vehicle model. Thus, the front section 41 of the rear floor side beam serves as a connecting transition between the rear floor frame body 1 and the sill beam. By replacing the front section 41 of the rear floor side beam with one adapted to the sill beam of different vehicle models, the rear floor frame body 1 can be adapted to the sill beams of different vehicle models, eliminating the need to redesign the rear floor frame body 1 for each vehicle model, effectively improving the applicability and versatility of the rear floor frame body 1.

[0042] In some embodiments, such as Figure 4 , Figure 5 and Figure 7 As shown, the rear floor frame beam assembly for the vehicle also includes a rear wheel hump connecting plate 42. The outer sides of the middle sections of the first longitudinal beam 14 and the second longitudinal beam 15 are respectively provided with second mating surfaces 17. One end of the rear wheel hump connecting plate 42 is fixedly connected to the second mating surface 17, and the other end of the rear wheel hump connecting plate 42 is used to fixally connect to the side panel assembly 93 of the vehicle.

[0043] One end of the aforementioned rear wheel hump connecting plate 42 can be welded to the second mating surface 17, while the other end can be fixedly connected to the vehicle's side panel assembly 93. The vehicle's side panel assembly 93 is a major structural component of the vehicle's side. The shape and size of the side panel assembly 93 vary between different vehicle models. By replacing the rear wheel hump connecting plate 42 with one that is compatible with the side panel assembly 93 of different vehicle models, the rear floor frame body 1 can be adapted to the side panel assembly 93 of different vehicle models.

[0044] In the above embodiment, by providing a second contact surface 17 on the outer side of the middle section of the first longitudinal beam 14 and the second longitudinal beam 15, one end of the rear wheel hump connecting plate 42 can be fixedly connected to the second contact surface 17, and the other end is connected to the side panel assembly 93 of the corresponding vehicle model. Thus, the rear wheel hump connecting plate 42 serves as a connecting transition between the rear floor frame body 1 and the side panel assembly 93. By replacing the rear wheel hump connecting plate 42 with one adapted to the side panel assembly 93 of different vehicle models, the rear floor frame body 1 can be adapted to the side panel assembly 93 of different vehicle models, eliminating the need to redesign the rear floor frame body 1 for each vehicle model, further improving the applicability and versatility of the rear floor frame body 1.

[0045] In some embodiments, such as Figure 4 , Figure 5 and Figure 8 As shown, the rear floor frame beam assembly for a vehicle also includes a rear section 43 of the rear floor side beam. The inner side of the rear section of the first longitudinal beam 14 and the second longitudinal beam 15 are respectively provided with a plurality of third contact surfaces 18. One end of the rear section 43 of the rear floor side beam is fixedly connected to the plurality of third contact surfaces 18, and the other end of the rear section 43 of the rear floor side beam is used to be fixedly connected to the rear skirt assembly of the vehicle.

[0046] The cross-sectional shape of the rear sections of the first longitudinal beam 14 and the second longitudinal beam 15 can be U-shaped. The draft angle of the left and right inclined surfaces of the rear sections of the U-shaped first longitudinal beam 14 and the second longitudinal beam 15 can range from 10 degrees to 20 degrees. This facilitates smooth demolding of the inner sides of the first longitudinal beam 14 and the second longitudinal beam 15 after hot stamping, reducing the possibility of sticking to the mold. The left and right inclined surfaces can extend outward along the length of the vehicle to form flat stops, which can be used to fit against the front end of the rear section 43 of the rear floor side beam.

[0047] like Figure 8 As shown, on the U-shaped rear section of the first longitudinal beam 14 and the second longitudinal beam 15, five third contact surfaces 18 can be formed on the bottom horizontal surface, the top horizontal surface (the aforementioned flat stop), and the left and right inclined surfaces. The width of the third contact surface 18 along the length direction of the vehicle can range from 25 mm to 35 mm to ensure the contact area between the third contact surface 18 and the rear section 43 of the rear floor edge beam.

[0048] The shape of the rear section 43 of the aforementioned rear floor side beam can be adapted to the rear section shape of the first longitudinal beam 14 and the second longitudinal beam 15. One end of the rear section 43 of the rear floor side beam can be respectively attached to and welded to the five third mating surfaces 18, and the other end of the rear section 43 of the rear floor side beam can be fixedly connected to the rear skirt assembly of the vehicle. The rear skirt assembly is a transverse structural component at the rear of the vehicle body, which connects the rear ends of the left and right side panels of the vehicle to form the rear end closed structure of the trunk. The rear skirt assemblies of different models differ in shape and size. By replacing the rear section 43 of the rear floor side beam with one that is adapted to the rear skirt assembly of different models, the rear floor frame body 1 can be adapted to the rear skirt assembly of different models.

[0049] In the above embodiments, by providing multiple third contact surfaces 18 on the inner rear sections of the first longitudinal beam 14 and the second longitudinal beam 15, the rear section 43 of the rear floor side beam can be fixedly attached to the rear floor frame body 1 on multiple surfaces, effectively improving the connection strength and positioning accuracy between the two. Furthermore, the rear section 43 of the rear floor side beam serves as a connecting transition component between the rear floor frame body 1 and the rear skirt assembly. By replacing the rear section 43 with one adapted to the rear skirt assembly of different vehicle models, the rear floor frame body 1 can be adapted to the rear skirt assembly of different vehicle models, eliminating the need to redesign the rear floor frame body 1 for each vehicle model, significantly improving the applicability and versatility of the rear floor frame body 1.

[0050] In some embodiments, such as Figures 2 to 5 , Figure 9 As shown, a support member 5 and a lifting lug assembly 6 are respectively provided at the connection between the first longitudinal beam 14 and the second longitudinal beam 15 and the middle cross beam 12. The first longitudinal beam 14 and the second longitudinal beam 15 each have a beam body 151. The support member 5 is fixedly connected to the inner side of the beam body 151, and the lifting lug assembly 6 is fixedly connected to the outer side of the beam body 151. A first chamber 64 is formed between the support member 5 and the beam body 151, and between the beam body 151 and the lifting lug assembly 6.

[0051] The first longitudinal beam 14 and the second longitudinal beam 15 mentioned above can each have a beam body 151, which can be understood as the main structural part of the first longitudinal beam 14 and the second longitudinal beam 15. The connection between the first longitudinal beam 14 and the second longitudinal beam 15 and the middle cross beam 12 can be provided with a support member 5 and a lug assembly 6, respectively. This position can correspond to the front mounting point 96 of the rear subframe of the vehicle.

[0052] The aforementioned support member 5 can be an inverted three-sided box-shaped stamped part, with a square top surface, triangular inner surfaces, and a rectangular front surface. The three sides of the support plate body, excluding the top surface, can extend outwards with flat stopes. The width of these flat stopes can range from 15 mm to 25 mm, for welding connection after fitting against the upper surface of the beam body 151. A circular hole can be provided on the top surface of the support member 5 for inserting the first fastener 63 (described in detail below). The diameter of the circular hole can range from 20 mm to 25 mm.

[0053] The aforementioned lifting lug assembly 6 can be fixedly connected to the lower surface of the beam body 151, such as... Figure 9 As shown, first chambers 64 can be formed between the support member 5 and the beam body 151, and between the beam body 151 and the lug assembly 6. It can be understood that by forming closed chambers on the inner and outer sides of the beam body 151, the first longitudinal beam 14 and the second longitudinal beam 15 form a multi-layered composite load-bearing structure in the subframe front mounting point area. When the subframe front mounting point is subjected to vertical loads or longitudinal impacts from the rear subframe, the inner and outer chambers can absorb and disperse the loads respectively, thereby significantly improving the local stiffness and fatigue resistance of the subframe front mounting point area.

[0054] In the above embodiment, by providing support members 5 and lifting lug assemblies 6 at the connection points of the first longitudinal beam 14 and the second longitudinal beam 15 with the middle cross beam 12, respectively, the support members 5 can be fixed to the inner side of the beam body 151, and the lifting lug assemblies 6 can be fixed to the outer side of the beam body 151, thereby forming a first chamber 64 between the support members 5 and the beam body 151 and between the beam body 151 and the lifting lug assemblies 6, respectively. This provides a double-layer closed chamber structure for the front mounting point 96 of the rear subframe, effectively improving the local stiffness and load-bearing capacity of the area of ​​the front mounting point 96 of the rear subframe. Furthermore, the construction of the high-strength mounting point is completed with only a small number of parts, reducing the number of parts, lowering the complexity of the welding process, and helping to control manufacturing costs.

[0055] In some embodiments, such as Figure 9 and Figure 10 As shown, the lifting lug assembly 6 includes a first connector 61, a second connector 62, and a first fastener 63. The second connector 62 is fixedly connected to the first connector 61, and the first fastener 63 is fixedly connected to the second connector 62. The first fastener 63 passes through the beam body 151 and the support member 5, and is fixedly connected to the beam body 151 and the support member 5 respectively.

[0056] The aforementioned first connector 61 can be a sheet metal stamping part with a thickness of 1.5 mm to 2 mm. It can have an upward-opening tray-like structure. The bottom of the first connector 61 can have a horizontal surface, on which bolt mounting holes with a diameter of 20 mm can be formed. A drainage hole with a diameter of 10 mm can be provided behind the bolt mounting holes. The edge of the first connector 61 can be adapted to the lower surface of the beam body, so that the first connector 61 can be attached to the lower surface of the beam body and fixedly connected by welding.

[0057] The second connector 62 can be a sheet metal stamping part with a thickness of 1.5 mm to 2 mm. Its whole structure can be adapted to the bottom structure of the first connector 61 so that the second connector 62 can be set on the first connector 61 and welded to the first connector 61.

[0058] The first fastener 63 can be a nut tube. The lower end of the first fastener 63 can be conical, and the middle and top parts of the first fastener 63 can be cylindrical. The first fastener 63 can be provided with a threaded inner hole for fixing the front mounting point 96 of the rear subframe.

[0059] When assembling the first connector 61, the second connector 62, and the first fastener 63, the bottom conical surface of the first fastener 63 can first be welded to the second connector 62. The second connector 62 is then fixedly connected to the first connector 61 by welding. In this way, the first connector 61, the second connector 62, and the first fastener 63 can be pre-welded to form the lifting lug assembly 6.

[0060] It is understandable that when the lifting lug assembly 6 is assembled to the rear floor frame body 1, the first fastener 63 can penetrate the beam body 151 and the support member 5. The penetration position can be fixedly connected by welding, thereby fixing the lifting lug assembly 6 to the beam body 151 and the support member 5, further improving the structural rigidity and load-bearing capacity of the rear subframe mounting point area.

[0061] In the above embodiment, the lifting lug assembly 6 can be composed of a first connector 61, a second connector 62 and a first fastener 63. The first fastener 63 can pass through the beam body 151 and the support member 5 and be fixedly connected to both respectively, so that the load of the front mounting point 96 of the rear subframe can be directly transferred to the beam body 151 and the support member 5 through the first fastener 63, which effectively improves the load transfer efficiency and ensures the local structural strength of the rear floor frame body 1.

[0062] In some embodiments, such as Figures 1 to 5 ,and Figure 11As shown, the middle sections of the first longitudinal beam 14 and the second longitudinal beam 15 are respectively provided with second notches 152. A support assembly 7 is provided at the second notch 152, the support assembly 7 covers the second notch 152, and is fixedly connected to the first longitudinal beam 14 and the second longitudinal beam 15.

[0063] The middle sections of the first longitudinal beam 14 and the second longitudinal beam 15 are respectively provided with second notches 152. The second notches 152 are provided to avoid the installation position of the rear shock absorber 98, so that the rear shock absorber 98 can be installed by passing through the second notches 152 in the vertical direction, thereby avoiding interference between the first longitudinal beam 14 and the second longitudinal beam 15 and the rear shock absorber 98.

[0064] The aforementioned support assembly 7 can cover the second gap 152, that is, the support assembly 7 can fill the second gap 152, so that the structure of the first longitudinal beam 14 and the second longitudinal beam 15 can be completed. Specifically, the support assembly 7 can be welded to the first longitudinal beam 14 and the second longitudinal beam 15, so that the support assembly 7 can form an integral part with the first longitudinal beam 14 and the second longitudinal beam 15, ensuring the structural continuity and load-bearing capacity of the first longitudinal beam 14 and the second longitudinal beam 15 at the second gap 152.

[0065] In the above embodiment, by forming a second gap 152 in the middle section of the first longitudinal beam 14 and the second longitudinal beam 15, and setting a bracket assembly 7 at the second gap 152 to cover and fix the second gap 152, not only can an installation position be provided for the rear shock absorber 98, allowing the rear shock absorber 98 to be installed through the second gap 152, but the bracket assembly 7 can also cover and fill the second gap 152, thus completing the structural gap in the middle section of the first longitudinal beam 14 and the second longitudinal beam 15. This ensures the structural continuity and load-bearing capacity of the first longitudinal beam 14 and the second longitudinal beam 15 at the second gap 152, and prevents the problem of a decrease in the local stiffness of the first longitudinal beam 14 and the second longitudinal beam 15 due to the opening of the second gap 152.

[0066] In some embodiments, such as Figure 11 and Figure 12 As shown, the bracket assembly 7 includes a first bracket plate 71, a second bracket plate 72 and a third bracket plate 73. The second bracket plate 72 and the third bracket plate 73 cooperate to form a side wall structure. The first bracket plate 71 covers the side wall structure and is fixedly connected to the second bracket plate 72 and the third bracket plate 73.

[0067] The first support plate 71 can be a hexagonal cover structure. Multiple circular holes with a diameter of 12 mm can be evenly distributed on the upper cover plane of the first support plate 71. A flange hole with a diameter of 30 mm can be provided in the middle of the upper cover plane. The flange hole and multiple circular holes can be used to install the rear shock absorber 98. The edge of the first support plate 71 can extend downward to form a stop. The width of the stop can be in the range of 25 mm to 35 mm. The stop on the first support plate 71 can be used to weld and connect with the second support plate 72 and the third support plate 73 respectively.

[0068] The second support plate 72 can be a C-shaped sheet metal stamping part. The side edge and the edge away from the first support plate 71 of the C-shaped second support plate 72 can be respectively extended to form a stop. The width of the stop can be in the range of 15 mm to 25 mm. The stop on the second support plate 72 can be used to weld and connect with the third support plate 73 and the beam body 151 respectively.

[0069] The aforementioned third support plate 73 can be a side-standing four-sided sealing structure. The edge of the third support plate 73 facing the second support plate 72 can extend to form a stop. The width of the stop can be in the range of 15 mm to 25 mm. The stop on the third support plate 73 can be used to weld and connect with the first support plate 71 and the second support plate 72 respectively.

[0070] When assembling the first support plate 71, the second support plate 72, and the third support plate 73, the second support plate 72 and the third support plate 73 can be welded together to form a side wall structure. Then, the first support plate 71 can be placed on the side wall structure and welded to the second support plate 72 and the third support plate 73 respectively.

[0071] In the above embodiment, the second support plate 72 and the third support plate 73 can be enclosed to form a side wall structure. The first support plate 71 covers the top of the side wall structure and is fixedly connected to the second support plate 72 and the third support plate 73, thereby forming a box-shaped support assembly 7. This allows the support assembly 7 to cover the second notch 152 while also having high structural rigidity and strength.

[0072] In some embodiments, such as Figures 2 to 5 , Figure 13 As shown, reinforcing plates 8 are respectively provided at the connection between the first longitudinal beam 14 and the second longitudinal beam 15 and the rear cross beam 13. The reinforcing plates 8 cover the first longitudinal beam 14 and the second longitudinal beam 15 and are fixedly connected. A second chamber 81 is formed between the reinforcing plates 8 and the first longitudinal beam 14 and the second longitudinal beam 15.

[0073] like Figure 13As shown, the above-mentioned reinforcing plate 8 may be in a special-shaped upper cover-like structure, and a circular hole may be provided on the upper cover plane of the reinforcing plate 8 for passing through the second fastener 82 (described in detail hereinafter). The diameter of the above-mentioned circular hole may range from 22 mm to 30 mm.

[0074] As Figure 13 shown, reinforcing plates 8 are respectively provided at the joints of the first longitudinal beam 14 and the second longitudinal beam 15 with the rear cross beam 13, and this position may correspond to the rear mounting point 97 of the rear subframe of the vehicle. A second cavity 81 may be formed between the reinforcing plate 8 and the first longitudinal beam 14 as well as the second longitudinal beam 15. In this way, when the rear mounting point of the subframe bears a vertical load or a longitudinal impact, the second cavity 81 can absorb and disperse the load respectively, thereby significantly improving the local rigidity and load-bearing capacity of the region of the rear mounting point of the subframe.

[0075] It can be understood that since the entire main body 1 of the rear floor frame may be in the shape of a Chinese character "ri", the material corresponding to the hollow part thereof will be cut off in the stamping and blanking stage. To improve the material utilization rate, the material cut off from the hollow part can be used to manufacture the reinforcing plate 8, which effectively improves the material utilization rate and reduces the manufacturing cost of the reinforcing plate 8.

[0076] In the above-mentioned embodiment, by providing the reinforcing plate 8 at the joints of the first longitudinal beam 14 and the second longitudinal beam 15 with the rear cross beam 13, the reinforcing plate 8 is made to cover the first longitudinal beam 14 and the second longitudinal beam 15 and form the second cavity 81 therebetween, which enhances the structural strength of the rear sections of the first longitudinal beam 14 and the second longitudinal beam 15, provides a closed cavity structure for the rear mounting point 97 of the rear subframe, and effectively improves the local rigidity and load-bearing capacity of the region of the rear mounting point 97 of the rear subframe.

[0077] In some embodiments, as Figure 13 shown, the rear floor frame beam assembly further includes a second fastener 82 disposed corresponding to the reinforcing plate 8. One end of the second fastener 82 is fixedly connected to the rear patch panel 22, and the other end of the second fastener 82 penetrates through the reinforcing plate 8 and is fixedly connected thereto.

[0078] The above-mentioned second fastener 82 may specifically be a nut tube. The lower end of the second fastener 82 may be conical, the middle part and the top end of the second fastener 82 may be cylindrical, and a threaded inner hole may be provided inside the second fastener 82 for fixing the rear mounting point 97 of the rear subframe. During assembly, the conical surface at the bottom of the second fastener 82 may be connected to the rear patch panel 22 by welding, and the upper end of the second fastener 82 may penetrate through the reinforcing plate 8 and be welded and fixed thereto. In this way, the second fastener 82 can support the upper and lower ends of the second cavity 81 enclosed and formed between the reinforcing plate 8 and the beam body 151.

[0079] In the above embodiment, one end of the second fastener 82 can be fixedly connected to the rear patch plate 22, and the other end of the second fastener 82 can pass through the reinforcing plate 8 and be fixedly connected to it. This can provide support for the upper and lower ends of the second chamber 81, thereby further ensuring the overall structural strength and rigidity of the rear mounting point 97 area of ​​the rear subframe.

[0080] In some embodiments, such as Figures 2 to 6 , Figure 14 As shown, a first connecting hole 112 is provided on the bottom of the front crossbeam 11, and a second connecting hole 121 is provided on the bottom of the middle crossbeam 12. The first connecting hole 112 and the second connecting hole 121 are used to install a third fastener 122 that is connected to the vehicle's fuel tank 92.

[0081] The first connecting hole 112 can be located on the lower end plane of the front crossbeam 11, and the second connecting hole 121 can be located on the lower end plane of the middle crossbeam 12. The first connecting hole 112 and the second connecting hole 121 can be used to install a third fastener 122 connected to the vehicle's fuel tank 92. Specifically, the third fastener 122 can be a projection-welded nut. The fuel tank strap can be a strip-shaped fastener that wraps around the fuel tank 92. One end of the strap can be fixed to the first connecting hole 112 of the front crossbeam 11 using the third fastener 122, and the other end can be fixed to the second connecting hole 121 of the middle crossbeam 12 using the third fastener 122, thereby fixing the fuel tank 92 to the underside of the rear floor frame body 1. It is understood that the number and location of the first connecting holes 112 and the second connecting holes 121 can be determined according to actual usage needs to accommodate fuel tanks 92 of different sizes.

[0082] In the above embodiment, by providing a first connecting hole 112 at the bottom of the front crossbeam 11 and a second connecting hole 121 at the bottom of the middle crossbeam 12, the first connecting hole 112 and the second connecting hole 121 can cooperate to accommodate fuel tanks 92 of different sizes. This allows the rear floor frame body 1 to adapt to the fuel tank 92 installation requirements of different vehicle models without the need to redesign the floor frame body for different fuel tanks 92, further improving the versatility and applicability of the rear floor frame body 1.

[0083] In some embodiments, such as Figure 4 and Figure 14 As shown, the rear floor frame beam assembly for the vehicle also includes a rear floor front reinforcing crossbeam 91 fixedly connected to the front crossbeam 11. The rear floor front reinforcing crossbeam 91 is provided with a seat mounting bracket 911 for mounting the rear seats of the vehicle.

[0084] The cross-sectional shape of the aforementioned rear floor front reinforcing beam 91 can be "Z" shaped. The upper end of the "Z" shaped rear floor front reinforcing beam 91 can be welded to the upper plane of the front beam 11, and the lower end of the rear floor front reinforcing beam 91 can be welded to the lower plane of the front beam 11.

[0085] The upper surface of the aforementioned rear floor front reinforcing crossbeam 91 can form a locally recessed area. This recessed area can be used to accommodate and position the seat mounting bracket 911. The specific form of the seat mounting bracket 911 varies depending on the vehicle model. When the rear floor front reinforcing crossbeam 91 is used in a passenger car, a passenger car seat mounting bracket can be welded into the recessed area. When the rear floor front reinforcing crossbeam 91 is used in an SUV, an SUV seat mounting bracket can be welded into the recessed area. By replacing seat mounting brackets 911 of different specifications, the rear floor front reinforcing crossbeam 91 can be adapted to the rear seat installation requirements of different vehicle models, eliminating the need to design separate rear floor front reinforcing crossbeams 91 for different vehicle models.

[0086] In the above embodiment, a rear floor front reinforcing crossbeam 91 can be fixedly connected to the front crossbeam 11. The rear floor front reinforcing crossbeam 91 not only enhances the structural rigidity of the front crossbeam 11, but also provides a supporting foundation for the installation of the rear seats. Furthermore, by replacing different types of seat mounting brackets 911, installation adaptation for rear seats of different models can be achieved, eliminating the need to design separate rear floor front reinforcing crossbeams 91 for different models, effectively reducing the development cost of the rear floor front reinforcing crossbeam 91.

[0087] This application also provides a vehicle including the rear floor frame beam assembly for a vehicle as described above.

[0088] The aforementioned vehicles may be, but are not limited to, pure electric vehicles, hybrid vehicles, range-extended electric vehicles, plug-in hybrid vehicles, etc., and this application does not make any specific limitations in this regard.

[0089] The vehicle of this application includes the rear floor frame beam assembly for a vehicle as described above. Since the rear floor frame beam assembly for a vehicle described above has the beneficial effects described above, the vehicle including the rear floor frame beam assembly for a vehicle described above will necessarily also have the beneficial effects described above.

[0090] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes according to the claims of this application still fall within the scope of this application.

Claims

1. A rear floor frame beam assembly for a vehicle, characterized in that, include: The rear floor frame body (1) has a front crossbeam (11), a middle crossbeam (12), a rear crossbeam (13), a first longitudinal beam (14) and a second longitudinal beam (15). The front crossbeam (11), the middle crossbeam (12) and the rear crossbeam (13) are spaced apart along the length of the vehicle. The first longitudinal beam (14) and the second longitudinal beam (15) are respectively connected to the two ends of the front crossbeam (11), the middle crossbeam (12) and the rear crossbeam (13). The structural reinforcement component (2) includes a front patch plate (21) and a rear patch plate (22). The front patch plate (21) is set at the front and middle sections of the first longitudinal beam (14) and the second longitudinal beam (15), and the rear patch plate (22) is set at the rear section of the first longitudinal beam (14) and the second longitudinal beam (15). The structural reinforcement component (2) and the rear floor frame body (1) are connected and formed by hot stamping process. Beam reinforcement (3), the two ends of the front crossbeam (11) have a first notch (111) in the vertical direction, and the beam reinforcement (3) fills the first notch (111).

2. The rear floor frame beam assembly for a vehicle as described in claim 1, characterized in that, The rear floor frame beam assembly for the vehicle also includes a front section (41) of the rear floor side beam. The outer sides of the front sections of the first longitudinal beam (14) and the second longitudinal beam (15) are respectively provided with a first contact surface (16). One end of the front section (41) of the rear floor side beam is fixedly connected to the first contact surface (16), and the other end of the front section (41) of the rear floor side beam is used to be fixedly connected to the sill beam of the vehicle.

3. The rear floor frame beam assembly for a vehicle as described in claim 1, characterized in that, The rear floor frame beam assembly for the vehicle also includes a rear wheel hump connecting plate (42). The outer sides of the middle sections of the first longitudinal beam (14) and the second longitudinal beam (15) are respectively provided with second mating surfaces (17). One end of the rear wheel hump connecting plate (42) is fixedly connected to the second mating surface (17), and the other end of the rear wheel hump connecting plate (42) is used to be fixedly connected to the side panel assembly (93) of the vehicle.

4. The rear floor frame beam assembly for a vehicle as described in claim 1, characterized in that, The rear floor frame beam assembly for the vehicle also includes a rear floor side beam rear section (43). The inner side of the rear section of the first longitudinal beam (14) and the second longitudinal beam (15) are respectively provided with a plurality of third contact surfaces (18). One end of the rear floor side beam rear section (43) is fixedly connected to the plurality of the third contact surfaces (18), and the other end of the rear floor side beam rear section (43) is used to be fixedly connected to the rear skirt assembly of the vehicle.

5. The rear floor frame beam assembly for a vehicle as claimed in claim 1, characterized in that, A support member (5) and a lifting lug assembly (6) are respectively provided at the connection between the first longitudinal beam (14) and the second longitudinal beam (15) and the middle cross beam (12). The first longitudinal beam (14) and the second longitudinal beam (15) each have a beam body (151). The support member (5) is fixedly connected to the inner side of the beam body (151), and the lifting lug assembly (6) is fixedly connected to the outer side of the beam body (151). A first chamber (64) is formed between the support member (5) and the beam body (151), and between the beam body (151) and the lifting lug assembly (6).

6. The rear floor frame beam assembly for a vehicle as described in claim 5, characterized in that, The lug assembly (6) includes a first connector (61), a second connector (62), and a first fastener (63). The second connector (62) is fixedly connected to the first connector (61), and the first fastener (63) is fixedly connected to the second connector (62). The first fastener (63) passes through the beam body (151) and the support member (5) and is fixedly connected to the beam body (151) and the support member (5) respectively.

7. The rear floor frame beam assembly for a vehicle as claimed in claim 1, characterized in that, The first longitudinal beam (14) and the second longitudinal beam (15) each have a second notch (152) formed in the middle section. A support assembly (7) is provided at the second notch (152). The support assembly (7) covers the second notch (152) and is fixedly connected to the first longitudinal beam (14) and the second longitudinal beam (15).

8. The rear floor frame beam assembly for a vehicle as described in claim 7, characterized in that, The bracket assembly (7) includes a first bracket plate (71), a second bracket plate (72) and a third bracket plate (73). The second bracket plate (72) and the third bracket plate (73) cooperate to form a side wall structure. The first bracket plate (71) covers the side wall structure and is fixedly connected to the second bracket plate (72) and the third bracket plate (73).

9. The rear floor frame beam assembly for a vehicle as claimed in claim 1, characterized in that, A reinforcing plate (8) is provided at the connection between the first longitudinal beam (14) and the second longitudinal beam (15) and the rear cross beam (13). The reinforcing plate (8) covers the first longitudinal beam (14) and the second longitudinal beam (15) and is fixedly connected. A second chamber (81) is formed between the reinforcing plate (8) and the first longitudinal beam (14) and the second longitudinal beam (15).

10. The rear floor frame beam assembly for a vehicle as claimed in claim 9, characterized in that, The rear floor frame beam assembly for the vehicle also includes a second fastener (82) corresponding to the reinforcing plate (8), one end of the second fastener (82) being fixedly connected to the rear patch plate (22), and the other end of the second fastener (82) penetrating the reinforcing plate (8) and being fixedly connected thereto.

11. The rear floor frame beam assembly for a vehicle as claimed in claim 1, characterized in that, The front crossbeam (11) has a first connecting hole (112) on its bottom and the middle crossbeam (12) has a second connecting hole (121) on its bottom. The first connecting hole (112) and the second connecting hole (121) are used to install a third fastener (122) that is connected to the vehicle's fuel tank (92).

12. The rear floor frame beam assembly for a vehicle as claimed in claim 1, characterized in that, The rear floor frame beam assembly for the vehicle also includes a rear floor front reinforcing crossbeam (91) fixedly connected to the front crossbeam (11), and the rear floor front reinforcing crossbeam (91) is provided with a seat mounting bracket (911) for mounting the rear seats of the vehicle.

13. A vehicle, characterized in that, Includes the rear floor frame beam assembly for a vehicle as described in any one of claims 1 to 12.

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