Rear floor structure, rear casting of rear floor structure, and vehicle

Abstract

The present invention relates to a rear floor structure, a rear casting of the rear floor structure, and a vehicle, including a front section assembly of the rear floor and a rear casting. A receiving space for receiving the front section assembly of the rear floor is formed at the front end of the rear casting. The lateral two sides of the rear casting are respectively connected to the sill side beams on both sides. A first sealing surface for forming a seal with the battery pack assembly is provided at the bottom of the front section assembly of the rear floor, and a second sealing surface for forming a seal with the battery pack assembly is provided at the bottom of the sill side beam. There is a height difference between the first sealing surface and the second sealing surface. A sealing strengthening structure is provided at the connection between the rear casting and the sill side beam. The sealing strengthening structure forms a transition sealing surface, and the transition sealing surface smoothly docks with the first sealing surface and the second sealing surface along the transverse direction. The present invention can ensure smooth docking between the rear floor sealing surface with a height difference and the sealing surface of the sill side beam to form a continuous sealing surface, and can cope with different wheelbase vehicle models by arranging a plurality of sealing strengthening structures along the longitudinal direction, realizing platform generalization.

Description

Technical Field

[0001] The present invention relates to a vehicle body structure, and particularly to a rear floor structure. In addition, it also relates to a rear casting of the rear floor structure and a vehicle. Background Art

[0002] The front section assembly of the rear floor is an important part of the vehicle body, playing an important role in bearing seats and passengers, and is crucial for the sealing and NVH of the passenger compartment. Since electric vehicles have a battery system, the battery pack assembly is usually arranged under the passenger compartment. To ensure the sealing of the passenger compartment, a sealing strip is arranged between the battery pack assembly and the rear floor assembly for sealing.

[0003] Refer to Chinese Patent: CN218558539, which discloses a battery and vehicle body integrated structure and vehicle, including a vehicle body, a battery pack housing, and a sealing layer. The battery pack housing is connected to the vehicle body. The lower vehicle body of the vehicle body includes two sill beams, a front cabin structure assembly, and a rear floor assembly to form a square structure. The front part of the battery pack housing is connected to the front cabin structure assembly, the side part is connected to the sill beam, and the rear part is connected to the rear floor assembly. The top of the battery pack housing has a first area that serves as the floor panel of the vehicle body. The sealing layer is located between the top of the battery pack housing and the vehicle body and is used to fill the gap between the top of the battery pack housing and the vehicle body. The sealing layer is arranged around the first area. By using the top of the battery pack housing as the floor panel of the vehicle, the integration degree of the vehicle is improved, the weight of the vehicle is reduced, the space inside the passenger compartment where the first area is located and the space outside the passenger compartment are sealed and separated, and impurities or liquids outside the passenger compartment are prevented from entering the passenger compartment through the gap between the top of the battery pack housing and the vehicle body, ensuring the sealing and safety of the space inside the passenger compartment. In actual situations, there may be a height difference between the sealing surface of the rear floor assembly and the sealing surface of the sill beam. This technical solution simply arranges the sealing layer around, unable to ensure the sealing effect at the connection between the sealing surface of the rear floor assembly and the sealing surface of the sill beam. Moreover, with the continuous development of electric vehicles, the vehicle models are constantly evolving. This technical solution can only meet the requirements of a single vehicle model, unable to adapt to vehicle models with different wheelbases and unable to achieve platform generalization. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a rear floor structure to solve the problems pointed out in the background art that there is a height difference between the sealing surface of the rear floor assembly of the vehicle body and the sill beam, which cannot ensure the sealing effect at the connection, and it cannot adapt to different wheelbase vehicle models for sealing and cannot achieve platform generalization; the second purpose is to provide a rear casting of the rear floor structure; the third purpose is to provide a vehicle.

[0005] To achieve the above purposes, the technical solutions adopted by the present invention are as follows:

[0006] In a first aspect, the present invention provides a rear floor structure, including a front section assembly of the rear floor and a rear casting. A receiving space for accommodating the front section assembly of the rear floor is formed at the front end of the rear casting. The transverse two sides of the rear casting are respectively connected to the sill side beams on both sides. A first sealing surface for forming a seal with a battery pack assembly is provided at the bottom of the front section assembly of the rear floor. A second sealing surface for forming a seal with the battery pack assembly is provided at the bottom of the sill side beam. There is a height difference between the first sealing surface and the second sealing surface. A sealing reinforcement structure is provided at the connection between the rear casting and the sill side beam. The sealing reinforcement structure forms a transition sealing surface, and the transition sealing surface smoothly docks the first sealing surface and the second sealing surface in the transverse direction.

[0007] According to the above technical means, since the sealing reinforcement structure forms a transition sealing surface, it can smoothly dock the first sealing surface and the second sealing surface with a height difference, enabling the battery pack sealing strip to transition smoothly from the connection between the rear casting and the sill side beam, ensuring the reliability of the seal.

[0008] Furthermore, a plurality of the sealing reinforcement structures each extending transversely are arranged at intervals along the longitudinal direction at the connection between the rear casting and the sill side beam. The sealing reinforcement structure is a sealing reinforcement rib. The two ends of the sealing reinforcement rib are respectively docked with the first sealing surface and the second sealing surface. The inclined plane of the sealing reinforcement rib is the transition sealing surface.

[0009] According to the above technical means, a plurality of sealing reinforcement structures are arranged longitudinally on the rear casting, enabling the rear casting to meet the sealing requirements of different wheelbase models and improving the platform generalization rate of the rear floor structure of the present invention. At the same time, designing the sealing reinforcement structure in the form of a reinforcement rib can enhance the lateral stiffness of the rear floor structure and improve the vehicle's lateral anti-collision performance. Moreover, the inclined plane is convenient for processing and has a high degree of fitting with the battery pack sealing strip.

[0010] Furthermore, the cross-section of the sealing reinforcement rib is an inverted trapezoid, the lower base of the trapezoid is in the plane where the first sealing surface is located, and the upper base of the trapezoid is in the plane where the second sealing surface is located.

[0011] According to the above technical means, the sealing reinforcement rib can dock the first sealing surface and the second sealing surface more smoothly.

[0012] Furthermore, the included angle range between the transition sealing surface and the first sealing surface is 135° to 150°.

[0013] According to the above technical means, it is avoided that the included angle between the transition sealing surface and the first sealing surface is too small, so that the interface between the transition sealing surface and the first sealing surface cannot be smoothly transitioned.

[0014] Furthermore, the sealing reinforcement structures on the transverse two sides of the rear casting are symmetrically arranged.

[0015] According to the above technical means, the transition sealing surfaces on the transverse two sides of the rear casting can correspond one by one to cope with vehicle models with different wheelbases.

[0016] Furthermore, several of the sealing reinforcement structures on the same side are arranged at equal intervals along the longitudinal direction.

[0017] According to the above technical means, the platform generalization rate of the rear casting is improved.

[0018] Furthermore, the rear casting includes the front section of the rear floor skeleton, the first longitudinal beam of the rear casting, and the second longitudinal beam of the rear casting. The first longitudinal beam of the rear casting and the second longitudinal beam of the rear casting are arranged on the transverse two sides of the front section of the rear floor skeleton to form the semi-surrounding space. The sill side beam includes a first sill side beam and a second sill side beam that are symmetrically arranged transversely. The first longitudinal beam of the rear casting is laterally connected to the first sill side beam, and the second longitudinal beam of the rear casting is laterally connected to the second sill side beam.

[0019] According to the above technical means, the integration degree of the rear casting is improved, and the overlap between parts is reduced.

[0020] Furthermore, the first longitudinal beam of the rear casting and the second longitudinal beam of the rear casting are symmetric in structure, the first sill side beam and the second sill side beam are symmetric in structure. The first longitudinal beam of the rear casting includes a first overlapping edge and a second overlapping edge. The first overlapping edge is connected to the top of the first sill side beam, and the second overlapping edge is connected to the side of the first sill side beam.

[0021] According to the above technical means, the rear casting and the sill side beam are connected through the first overlapping edge and the second overlapping edge, reducing the use of connecting parts and improving the bending moment stiffness and lateral collision performance.

[0022] Furthermore, the front assembly of the rear floor includes the front section of the rear floor and the front cross beam assembly of the rear floor. The front cross beam assembly of the rear floor is fixedly connected to the front section of the rear floor. The first sealing surface is arranged at the bottom of the front section of the rear floor. The front section of the rear floor skeleton, the first longitudinal beam of the rear casting, and the second longitudinal beam of the rear casting are located on one side of the accommodating space and form a connecting flange. The edge of the front section of the rear floor is connected to the lower end surface of the connecting flange, and the edge of the front cross beam assembly of the rear floor is connected to the upper end surface of the connecting flange.

[0023] According to the above technical means, the edge of the front section of the rear floor is designed on the lower end surface of the connecting flange, avoiding the thickness of the connecting flange from affecting the smoothness of the butt joint between the transition sealing surface and the first sealing surface.

[0024] Furthermore, the second overlapping edge extends downward to exceed the lower end surface of the connecting flange, and the sealing reinforcement structure is arranged between the lower part of the second overlapping edge and the connecting flange.

[0025] According to the above technical means, it is beneficial to improve the lateral stiffness of the sealing reinforcement structure and the smoothness of the butt joint between the transition sealing surface and the first and second sealing surfaces.

[0026] Furthermore, the front cross member assembly of the rear floor includes a front cross member of the rear floor, a first longitudinal beam of the rear floor, and a second longitudinal beam of the rear floor. The front cross member of the rear floor is connected to the front ends of the first longitudinal beam of the rear floor and the second longitudinal beam of the rear floor. The transverse two ends of the front cross member of the rear floor are respectively lapped on the first longitudinal beam of the rear casting and the second longitudinal beam of the rear casting. The rear ends of the first longitudinal beam of the rear floor and the second longitudinal beam of the rear floor are lapped on the front section of the rear floor skeleton.

[0027] According to the above technical means, the front cross member of the rear floor forms a transverse force transmission path, improving the structural strength of the front section of the rear floor and meeting the anti-collision performance of the whole vehicle.

[0028] Further, the part of the front section of the rear floor corresponding to the battery pack sealing strip is recessed downward to form a groove transversely penetrating the front section of the rear floor. The bottom surface of the groove is the first sealing surface. The front cross member assembly of the rear floor further includes a sealing surface reinforcement member disposed transversely. The sealing surface reinforcement member is an upward convex structure corresponding to the groove. The sealing surface reinforcement member is cooperatively connected with the groove to form an upper and lower sealed cavity structure.

[0029] According to the above technical means, the first sealing surface is structurally strengthened through the upper and lower sealed cavity structure. The transversely penetrating groove can correspond to the sealing reinforcement structures on the transverse two sides to form a continuous structure to meet the requirements of the sealing function.

[0030] Further, the front section of the rear floor skeleton, the first longitudinal beam of the rear casting, the second longitudinal beam of the rear casting, and the sealing reinforcement structure are integrally formed.

[0031] According to the above technical means, the accuracy, load performance, and structural strength of the rear casting are improved.

[0032] In the second aspect, the present invention provides a rear casting of a rear floor structure. This rear casting is the rear casting in the rear floor structure described in the first aspect of the present invention.

[0033] In the third aspect, the present invention provides a vehicle, including a vehicle body. The vehicle body includes the rear floor structure described in the first aspect of the present invention or the rear casting of the rear floor structure described in the second aspect of the present invention.

[0034] The beneficial effects of the present invention:

[0035] (1) A horizontally extending sealing and strengthening structure is provided at the connection between the rear casting and the rear section of the sill side beam. The sealing surfaces at the bottom of the front assembly of the rear floor and the bottom of the sill side beam are smoothly butted through a transition sealing surface. On the one hand, the sealing effect is improved, and on the other hand, the side impact strength of the whole vehicle can be enhanced;

[0036] (2) A plurality of sealing and strengthening structures are longitudinally arranged on the rear casting to meet the requirements of different wheelbase models, enabling the rear casting to form a platform part and improving the platform generalization rate;

[0037] (3) By forming a horizontally penetrating groove by recessing the part of the front section of the rear floor corresponding to the battery pack sealing strip and cooperating with a connecting sealing surface strengthening member to form an upper and lower sealed cavity structure, on the one hand, the first sealing surface is structurally strengthened, and on the other hand, it corresponds to the sealing and strengthening structures on both lateral sides to form a continuous structure to meet the sealing function requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram (top view) of the rear floor structure of the present invention;

[0039] Figure 2 is a schematic structural diagram (bottom view) of the rear floor structure of the present invention;

[0040] Figure 3 is an exploded view of the structure of the rear floor structure of the present invention;

[0041] Figure 4 is a schematic diagram of the structural evolution of the sealing part in the rear floor structure of the present invention Figure 1 ;

[0042] Figure 5 is a schematic diagram of the structural evolution of the sealing part in the rear floor structure of the present invention Figure 2 ;

[0043] Figure 6 is a schematic diagram of the partial structure of the rear floor structure of the present invention;

[0044] Figure 7 is a schematic diagram of the partial cross-section of the rear floor structure of the present invention;

[0045] Figure 8 is a schematic diagram of the cross-section of the connection part between the first longitudinal beam of the rear casting and the first sill side beam;

[0046] Figure 9 is a schematic diagram of the connection structure between the first overlapping edge and the first sill side beam;

[0047] Figure 10 is a schematic diagram of the connection structure between the second overlapping edge and the first sill side beam;

[0048] Figure 11Schematic diagram of the connection structure of the front cross member assembly of the rear floor

[0049] Figure 12 Schematic diagram of the connection structure of the front section of the rear floor

[0050] Wherein, 1 - front section assembly of the rear floor; 11 - front section of the rear floor; 111 - groove; 12 - front cross member assembly of the rear floor; 121 - front cross member of the rear floor; 122 - first longitudinal beam of the rear floor; 123 - second longitudinal beam of the rear floor; 124 - seal surface reinforcement; 2 - rear casting; 21 - front section of the rear floor skeleton; 22 - first longitudinal beam of the rear casting; 221 - first lapping edge; 222 - second lapping edge; 23 - second longitudinal beam of the rear casting; 24 - seal reinforcement rib; 25 - connecting flange; 3 - first sill side beam; 4 - second sill side beam; 5 - battery pack sealing strip; 6 - battery pack upper cover; 100 - first hot melt self-tapping screw; 200 - second hot melt self-tapping screw; 300 - first rivet; 400 - second rivet; 500 - third rivet; 600 - first bolt; 700 - second bolt; A - first seal surface; B - second seal surface; C - transition seal surface Specific embodiments

[0051] The following will illustrate the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention

[0052] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex

[0053] In the present invention, unless otherwise specified, the orientation terms such as "top, bottom, up, down, left, right, front, and back" are defined based on the top, bottom, up, down, left, right, front, and back of the vehicle in its normal driving state. Specifically, the direction from the vehicle's center of mass to the vehicle's roof is defined as top and up, the direction from the vehicle's center of mass to the vehicle's chassis is defined as bottom and down, the direction from the vehicle's center of mass to the vehicle's head is defined as front, the direction from the vehicle's center of mass to the vehicle's tail is defined as back, the direction from the vehicle's right wheel to the vehicle's left wheel is defined as left, and the direction from the vehicle's left wheel to the vehicle's right wheel is defined as right. In the following description, "lateral" refers to the left-right direction, "longitudinal" refers to the front-back direction, and "inner and outer" refer to the inner and outer of the contours of relevant components. The orientation descriptions of the embodiments of the present invention are all made based on the orientation of the embodiments of the present invention in the vehicle assembly state. In addition, it should be noted that the terms such as "first" and "second" are used to distinguish one element from another and do not have sequentiality and importance.

[0054] In a first aspect, an embodiment of the present invention provides a rear floor structure. Refer to Figures 1 - 12As shown in the figure, it includes the front section assembly 1 of the rear floor and the rear casting 2. A receiving space for accommodating the front section assembly 1 of the rear floor is formed at the front end of the rear casting 2. The front section assembly 1 of the rear floor is fixedly connected to the rear casting 2. The left and right side sill side beams are respectively connected to the two lateral sides of the rear casting 2. Among them, a first sealing surface A for forming a seal with the battery pack assembly is provided at the bottom of the front section assembly 1 of the rear floor, and a second sealing surface B for forming a seal with the battery pack assembly is provided at the bottom of the side sill side beam. The rear floor structure of the present invention is located above the battery pack assembly, and cooperates with the battery pack sealing strip 5 provided above the battery pack upper cover 6 through the first sealing surface A and the second sealing surface B to seal the passenger compartment. The battery pack sealing strip 5 is sealed transversely on the second sealing surface A, and the battery pack sealing strip 5 is longitudinally sealed along the length direction of the side sill side beam on the first sealing surface B. There is a height difference in the up and down direction between the first sealing surface A and the second sealing surface B. When the battery pack sealing strip 5 is at the connection between the rear casting 2 and the side sill side beam, it needs to transition from the first sealing surface A to the second sealing surface B to change from transverse sealing to longitudinal sealing. In order to enable the battery pack sealing strip 5 to fit the continuous sealing surface to ensure the sealing effect, in the embodiment of the present invention, a sealing strengthening structure is provided at the connection between the rear casting 2 and the side sill side beam, and a transition sealing surface C is formed on the sealing strengthening structure. The transition sealing surface C smoothly docks the first sealing surface A and the second sealing surface B transversely, so that the battery pack sealing strip 5 continues to fit the transition sealing surface C transversely on the first sealing surface A, gently changes the height position of the battery pack sealing strip 5 in the up and down direction until the transition sealing surface C transitions the battery pack sealing strip 5 to the height position where the second sealing surface B is located, and the battery pack sealing strip 5 can turn to perform longitudinal sealing of the side sill side beam. The first sealing surface A, the transition sealing surface C, and the second sealing surface B form a continuous and gentle sealing surface, avoiding the problem of poor sealing caused by the height difference between the first sealing surface A of the front section assembly 1 of the rear floor and the second sealing surface B of the side sill side beam.

[0055] In a preferred embodiment of the present invention, referring to Figures 1 - 2As shown, at the connection between the rear casting 2 and the sill side beam, a number of sealing and strengthening structures each extending transversely are arranged at longitudinal intervals. When performing vehicle model evolution, according to the wheelbase of the target vehicle model, the sealing and strengthening structure at an appropriate position can be selected to seal and strengthen between the battery pack assembly and the rear floor structure of the present invention. Thus, the rear casting 2 serves as a platform part to meet the requirements of different wheelbase vehicle models and improve the platform generalization rate. Further, the sealing and strengthening structure is a sealing and strengthening rib 24. A plurality of sealing and strengthening ribs 24 arranged at longitudinal intervals on the transverse sides of the rear casting 2 can greatly strengthen the lateral stiffness of the rear floor structure of the present invention, thereby improving the side collision performance of the whole vehicle. Both ends of the sealing and strengthening rib 24 are respectively butted against the first sealing surface A and the second sealing surface B. The inclined plane of the sealing and strengthening rib 24 is a transition sealing surface C. The inclined plane is easier to machine and can better smoothly butt against the first sealing surface A and the second sealing surface B, having a high degree of fit with the battery pack sealing strip 5 to ensure the sealing effect.

[0056] The sealing and strengthening rib 24 has various structural forms, such as a triangular strengthening rib and a trapezoidal strengthening rib. In a preferred case, a trapezoidal strengthening rib is selected. See Figure 6 As shown, the cross-section of the sealing and strengthening rib 24 is an inverted trapezoid. The longer lower base of the trapezoid is in the plane where the first sealing surface A is located, and the shorter upper base of the trapezoid is in the plane where the second sealing surface B is located. The transition sealing surface C is in the plane of the hypotenuse of the trapezoid. After the rear casting 2 is connected to the sill side beam, the second sealing surface B at the bottom of the sill side beam can first be butted against the plane where the upper base of the trapezoid is located, and then smoothly transition to the first sealing surface A transversely through the transition sealing surface C. The butting effect of the first sealing surface A, the transition sealing surface C, and the second sealing surface B is more continuous and smooth, improving the sealing effect of the battery pack sealing strip 5. Further, the butting edge between the plane where the upper base of the trapezoid is located and the transition sealing surface C can be designed with a rounded corner to improve the degree of fit of the battery pack sealing strip 5 here and avoid the butting edge between the two being too sharp, which may damage the battery pack sealing strip 5 during the long-term pressing of the battery pack sealing strip 5.

[0057] In the embodiment of the present invention, the included angle range between the transition sealing surface C and the first sealing surface A is preferably 135° to 150°, and the first sealing surface A and the second sealing surface B are parallel or nearly parallel, so that the inclined plane serving as the transition sealing surface C can smoothly butt against the first sealing surface A and the second sealing surface B.

[0058] See Figure 2, the part of the battery pack sealing strip 5 that cooperates with the first sealing surface A for sealing is arranged horizontally. The two horizontal sides of the first sealing surface A are respectively butted against the second sealing surface B through the transition sealing surfaces C on the sealing reinforcement structures on the left and right sides. In the embodiment of the present invention, the sealing reinforcement structures located on the two horizontal sides of the rear casting 2 are symmetrically arranged, so that the transition sealing surfaces C on the left and right sides of the first sealing surface A can correspond one by one. The sealing reinforcement structures corresponding to each other on the two horizontal sides are matched with vehicle models of the same wheelbase, and multiple groups of sealing reinforcement structures are used to cope with vehicle models of different wheelbases.

[0059] Furthermore, several sealing reinforcement structures on the same side are arranged at equal intervals longitudinally, and the longitudinal interval distance is determined to form standardization, which is convenient for coping with the evolution of different vehicle models and improving the platform generalization rate of the rear casting. It should be noted that the wheelbase of the platform vehicle model can also be determined in advance at the design stage, and only the longitudinal intervals of the sealing reinforcement structures are designed for the wheelbases of several confirmed vehicle models, so that the rear casting can form a platform part that only responds to the wheelbases of these several vehicle models. The longitudinal intervals between adjacent sealing reinforcement structures can be equal or unequal.

[0060] In the embodiment of the present invention, as shown in Figures 1 - 3 , the rear casting 2 includes the front section 21 of the rear floor skeleton, the first longitudinal beam 22 of the rear casting, and the second longitudinal beam 23 of the rear casting. The first longitudinal beam 22 and the second longitudinal beam 23 of the rear casting are arranged on the two horizontal sides of the front section 21 of the rear floor skeleton, so as to jointly form a "U"-shaped accommodation space with the front section 21 of the rear floor skeleton for connecting with the front assembly 1 of the rear floor and wrapping the front assembly 1 of the rear floor, improving the bending stiffness and torsional stiffness of the rear casting 2, and at the same time increasing the integration degree of the rear casting 2 and reducing the lap between parts. The sill side beams include the first sill side beam 3 and the second sill side beam 4 that are symmetrically arranged horizontally. The first longitudinal beam 22 of the rear casting on the right side is laterally connected to the first sill side beam 3, and the second longitudinal beam 23 of the rear casting on the left side is laterally connected to the second sill side beam 4. The first sill side beam 3 and the second sill side beam 4 preferably adopt an extruded aluminum structure to meet the lightweight requirements of the whole vehicle.

[0061] In the embodiment of the present invention, the first longitudinal beam 22 and the second longitudinal beam 23 of the rear casting are symmetric in structure, and the first sill side beam 3 and the second sill side beam 4 are symmetric in structure. As shown in Figure 6 and Figure 8 , the first longitudinal beam 22 of the rear casting includes a first overlapping edge 221 and a second overlapping edge 222. The first overlapping edge 221 is connected to the top of the second sill side beam 3, and the second overlapping edge 222 is connected to the side of the first sill side beam 3. Through the mutual cooperation of the first overlapping edge 221 and the second overlapping edge 222, it is convenient for the assembly of the first longitudinal beam 22 of the rear casting and the first sill side beam 3, realizes the fixed connection between the two, and at the same time can reduce the use of connecting parts and improve the bending moment stiffness and lateral collision performance at the connection.

[0062] In an embodiment of the present invention, refer to Figures 1 - 3 As shown, the front section assembly 1 of the rear floor includes a front section 11 of the rear floor and a front cross beam assembly 12 of the rear floor. The front cross beam assembly 12 of the rear floor is fixedly connected to the front section 11 of the rear floor to increase the overall structural strength of the front section assembly 1 of the rear floor. Among them, a first sealing surface A is provided at the bottom of the front section 11 of the rear floor. A connecting flange 25 is formed on one side of the front section 21 of the rear floor skeleton, the first longitudinal beam 22 of the rear casting, and the second longitudinal beam 23 of the rear casting in the accommodation space. The edge of the front section 11 of the rear floor is connected to the lower end surface of the connecting flange 25, and the edge of the front cross beam assembly 12 of the rear floor is connected to the upper end surface of the connecting flange 25. By arranging the lower end surface of the connecting flange 25 on the front section 11 of the rear floor, it can effectively avoid the thickness of the connecting flange 25 affecting the smoothness of the butt joint between the transition sealing surface C and the first sealing surface A, making the sealing height at the joint between the edge of the battery pack sealing strip 5 and the connecting flange 25 on the front section 11 of the rear floor more uniform and ensuring the reliability of the seal. Among them, refer to Figure 12 , the edge of the front section 11 of the rear floor and the connecting flange 25 are fixedly connected by a third rivet 500 using SPR (self-piercing riveting process), and structural adhesive is coated between the connection surface of the connecting flange 25 and the front section 11 of the rear floor to enhance the durability strength and fatigue resistance strength of the joint.

[0063] In an embodiment of the present invention, refer to Figures 1 - 3 and Figure 6 As shown, the second overlapping edge 222 extends downward beyond the lower end surface of the connecting flange 25. A sealing reinforcing rib 24 (sealing reinforcing structure) is provided between the lower part of the second overlapping edge 222 and the connecting flange 25. While improving the lateral stiffness at the joint between the first longitudinal beam 22 of the rear casting and the first sill side beam 3, it can make the transition sealing surface C of the sealing reinforcing rib 24 smoothly dock with the first sealing surface A and the second sealing surface B.

[0064] In an embodiment of the present invention, refer to Figure 9 As shown, the first overlapping edge 221 and the top end surface of the first sill side beam 3 are connected by a first hot melt self-tapping screw 100, and these 11 first hot melt self-tapping screws 100 are fixedly connected in two rows, and structural adhesive is coated in an "S" shape between the connection areas to ensure the strength of the connection areas.

[0065] In an embodiment of the present invention, refer to Figure 10As shown, the second overlapping edge 222 is connected to the side end face of the first sill side beam 3 by the first bolt 600. In order to ensure the durability strength and fatigue strength at the connection, two rows of the first bolts 600 are provided. Among them, since the second overlapping edge 222, the connecting flange 25 and the sealing reinforcing rib 24 form a plurality of semi - enclosed spaces, considering the assembly feasibility, the first bolts 600 arranged in the upper row are assembled transversely from the first sill side beam 3 towards the second overlapping edge 222 direction. Process through - holes are designed on the first sill side beam 3 to ensure the assembly feasibility. The first bolts 600 arranged in the lower row are assembled transversely from the second overlapping edge 222 towards the first sill side beam 3 direction.

[0066] In the embodiment of the present invention, referring to Figures 1 - 3 and Figure 11 As shown, the front cross - beam assembly 12 of the rear floor includes a front cross - beam 121 of the rear floor, a first longitudinal beam 122 of the rear floor and a second longitudinal beam 123 of the rear floor. The front cross - beam assembly 12 of the rear floor is integrally spot - welded to the front section 11 of the rear floor. The front cross - beam 121 of the rear floor is connected to the front ends of the first longitudinal beam 122 and the second longitudinal beam 123 of the rear floor. The front cross - beam 121 of the rear floor, the first longitudinal beam 122 of the rear floor and the second longitudinal beam 123 of the rear floor are interconnected to form a "Π" - shaped frame structure, which is made of hot - forming materials (such as boron steel), and can greatly strengthen the structural strength of the front section 11 of the rear floor. The transverse two ends of the front cross - beam 121 of the rear floor are respectively lapped on the first longitudinal beam 22 and the second longitudinal beam 23 of the rear casting, thereby forming a transverse force - transmission path, improving the lateral stiffness and lateral anti - collision performance of the whole vehicle. The overlapping area between it and the two is fixedly connected by the second bolt 900. And the bottoms of the two ends of the front cross - beam 121 of the rear floor are fixedly connected to the connecting flange 25 by the first rivet 300 using SPR. At the same time, the overlapping area is coated with structural adhesive to increase the durability strength and fatigue strength at the connection. The rear ends of the first longitudinal beam 122 and the second longitudinal beam 123 of the rear floor are lapped on the front section 21 of the rear floor skeleton. Lapping edges are formed at the rear ends of both of them. The lapping edges are lapped on the front section 21 of the rear floor skeleton and are fixedly connected by the second hot - melt self - tapping screw 200. And the bottoms of the rear ends of the first longitudinal beam 122 and the second longitudinal beam 123 of the rear floor are fixedly connected to the connecting flange 25 by the second rivet 400 using SPR. At the same time, the overlapping area is coated with structural adhesive to increase the durability strength and fatigue strength at the connection.

[0067] In the exemplary embodiment, the front section 21 of the rear floor skeleton, the first longitudinal beam 22 of the rear casting, the second longitudinal beam 23 of the rear casting and the sealing reinforcing structure (sealing reinforcing rib 24) are integrally cast and formed of aluminum alloy. Utilizing the advantages of the casting process, the manufacturing precision of the rear casting 2 is ensured, so that the installation accuracy of all the installation points between the rear casting 2 and the front - section assembly 1 of the rear floor and between the rear casting 2 and the sill side beam is greatly improved, effectively improving the overall load - bearing performance and structural strength.

[0068] In an embodiment of the present invention, referring to Figures 1 - 3 and Figure 7 , at the position of the front section 11 of the rear floor corresponding to the battery pack sealing strip 5, a groove 111 is formed by downward depression, which transversely penetrates the front section 11 of the rear floor. The bottom surface of the groove 111 is the first sealing surface A. The two ends of the groove 111 correspond to the sealing reinforcing ribs 24 located on both sides, which can better dock the first sealing surface A and the transition sealing surfaces C on both transverse sides. At the same time, the concave structure of the groove 111 can also increase the structural strength of the part where the first sealing surface A is located, and can better realize the fitting of the first sealing surface A and the battery pack sealing strip 5 to meet the requirements of the sealing function. A certain gap is reserved between the upper cover 6 of the battery pack and the first sealing surface A to reserve a sealing space for the battery pack sealing strip 5. Among them, the battery pack sealing strip 5 is preferably made of PE (polyethylene) material, with a designed thickness of 8 mm and a compression amount of 3 mm to ensure good sealing performance.

[0069] Furthermore, in an embodiment of the present invention, referring to Figure 7 , the front crossbeam assembly 12 of the rear floor further includes a sealing surface strengthening member 124 arranged transversely. The sealing surface strengthening member 124 transversely penetrates the first longitudinal beam 122 and the second longitudinal beam 123 of the rear floor. The sealing surface strengthening member 124 is an upward convex structure corresponding to the groove 111. The sealing surface strengthening member 124 is connected above the groove 111, and the two cooperate to form an upper and lower closed cavity structure. This upper and lower closed cavity structure constitutes a transversely penetrating reinforcing rib structure, which can be docked with the corresponding sealing reinforcing ribs on both transverse sides to form a continuous structure, further strengthening the structure of the first sealing surface A and preventing the deformation of the first sealing surface A from affecting the sealing effect.

[0070] In some exemplary embodiments of the present invention, referring to Figure 4 and Figure 5 shown, in the orientation shown by Figure 4 and Figure 5 , a total of 8 groups of sealing reinforcing ribs 24 are arranged on the rear casting 2 from top to bottom. The sealing reinforcing ribs 24 on the same side are arranged at equal longitudinal intervals, and the interval is 50 mm, so that longitudinal adjustment can be carried out according to the requirements of the sealing surfaces of different wheelbase models. As Figure 4 shown, the two ends of the groove 111 on the front section 11 of the rear floor respectively correspond to the fifth group of sealing reinforcing ribs 24. The first sealing surface A is smoothly docked with the second sealing surfaces B on both sides through the transition sealing surfaces C on both transverse sides. The first sealing surface A, the second sealing surface B and the transition sealing surface C together form a continuous sealing surface, so that the battery pack sealing strip 5 is attached to this continuous sealing surface to ensure the sealing effect; when Figure 4 the vehicle model to be dealt with undergoes evolution, the wheelbase is lengthened by 50 mm, and the battery pack assembly remains unchanged, as Figure 5As shown, while keeping the interface lap joint between the rear casting 2 and the front section assembly 1 of the front floor unchanged, the groove 111 of the front section 11 of the rear floor evolves, such that both ends of the groove 111 respectively correspond to the fourth group of sealing and strengthening ribs 24, thereby forming a continuous sealing surface for the battery pack sealing strip 5 to fit, ensuring the sealing effect. By analogy, when subsequent vehicle model evolutions continue and the wheelbase changes, the front section 11 of the rear floor can be used as a dedicated part. According to the wheelbase of the vehicle model, the sealing position is confirmed to form a corresponding groove 111, and the docking is formed with the sealing and strengthening ribs 24 on both sides, so that the sealing surfaces at the bottom of the front section 1 of the rear floor and the bottom of the sill side beam form a continuous and smooth sealing surface, solving the problem of discontinuous sealing caused by the height difference between the front section 1 of the rear floor and the sill side beam. At the same time, multiple groups of sealing and strengthening ribs 24 are arranged on both lateral sides of the rear casting 2, enabling the rear casting 2 to form a platform part to meet the requirements of different wheelbase vehicle models and improving the platform generalization rate.

[0071] To better understand the technical concept of the present invention, the following is described in combination with relatively comprehensive technical features.

[0072] See Figures 1 - 12As shown in the figure, a preferred embodiment of the present invention provides a rear floor structure, which includes a front section assembly 1 of the rear floor and a rear casting 2. The rear casting 2 is formed by connecting a front section 21 of the rear floor skeleton, a first longitudinal beam 22 of the rear casting, and a second longitudinal beam 23 of the rear casting. The first longitudinal beam 22 of the rear casting and the second longitudinal beam 22 of the rear casting are arranged on the lateral sides of the front section 21 of the rear floor skeleton to form a "U"-shaped accommodation space for accommodating the front section assembly 1 of the rear floor. The first longitudinal beam 22 of the rear casting located on the right side is laterally connected to the first sill side beam 3, and the second longitudinal beam 23 of the rear casting located on the left side is laterally connected to the second sill side beam 4. The front section assembly 1 of the rear floor includes a front section 11 of the rear floor and a front crossbeam assembly 12 of the rear floor. The front crossbeam assembly 12 of the rear floor is fixed on the front section 11 of the rear floor for structural reinforcement. A first sealing surface A for sealing with the battery pack assembly is formed below the front section 11 of the rear floor. Second sealing surfaces B for sealing with the battery pack assembly are formed at the bottoms of both the first sill side beam 3 and the second sill side beam 4. Horizontally extending sealing and strengthening ribs 24 are arranged at intervals along the longitudinal direction on both the first longitudinal beam 22 of the rear casting and the second longitudinal beam 23 of the rear casting. The inclined plane of the sealing and strengthening rib 24 can be used as a transition sealing surface C for smoothly docking the first sealing surface A and the second sealing surface B horizontally, so that the first sealing surface A and the second sealing surface B with a height difference form a smooth and continuous sealing surface through the transition sealing surface C. A connecting flange 25 is formed on one side of the accommodation space of the front section 21 of the rear floor skeleton, the first longitudinal beam 22 of the rear casting, and the second longitudinal beam 23 of the rear casting. The edge of the front section 11 of the rear floor is connected to the lower end surface of the connecting flange 25, and the edge of the front crossbeam assembly 12 of the rear floor is connected to the upper end surface of the connecting flange 25. The first longitudinal beam 22 of the rear casting is formed with a first overlapping edge 221 that overlaps with the top of the second sill side beam 3 and a second overlapping edge 222 that overlaps with the side of the first sill side beam 3. The second overlapping edge 222 extends downward to exceed the lower end surface of the connecting flange 25. The sealing and strengthening rib 24 is arranged between the lower part of the second overlapping edge 222 and the connecting flange 25. The second longitudinal beam 23 of the rear casting is symmetrically structured with the first longitudinal beam 22 of the rear casting. The part of the front section 11 of the rear floor corresponding to the battery pack sealing strip 5 is recessed downward to form a groove 111 that horizontally penetrates the front section 11 of the rear floor. The bottom surface of the groove 111 is the first sealing surface A. The two ends of the groove 111 correspond to the sealing and strengthening ribs 24 located on both sides. The front crossbeam assembly 12 of the rear floor includes a sealing surface strengthening member 124 arranged horizontally. The sealing surface strengthening member 124 is an upward convex structure corresponding to the groove 111. The sealing surface strengthening member 124 is connected to the groove 111 in a matching manner to form an upper and lower sealed cavity structure for strengthening the structure of the first sealing surface A.

[0073] Based on the above technical solution, compared with the prior art where there is a height difference between the sealing surfaces of the sill side beams in the rear floor assembly of a vehicle, which cannot ensure the sealing effect at the connection and thus cannot ensure the sealing effect, and the problem that it cannot adapt to vehicles with different wheelbases for sealing and cannot achieve platform generalization. In the present invention, through the sealing ribs 24 on the rear casting 2, a first sealing surface A that can smoothly butt against the bottom of the front section 11 of the rear floor in the transverse direction and a second sealing surface B at the bottom of the sill side beam are formed, so that the sealing surface at the bottom of the rear floor structure for fitting with the battery pack sealing strip 5 to form a sealing structure can be continuous and smooth, ensuring the sealing effect. At the same time, a plurality of sealing ribs 24 are arranged at intervals in the longitudinal direction. During the vehicle model evolution process, according to the wheelbase of the vehicle to be dealt with, appropriate sealing ribs 24 are selected to form a sealing structure, with a very high platform generalization rate. Moreover, the plurality of sealing ribs 24 arranged on both sides of the rear casting 2 can improve the lateral stiffness of the rear floor structure, thereby improving the lateral anti-collision performance of the whole vehicle. In addition, by forming a concave groove 111 in the front section 11 of the rear floor and using the bottom surface of the groove 111 as the first sealing surface A, it is convenient for the first sealing surface A to be smoothly butted against the transition sealing surface C better. The upper and lower sealing cavity structure formed by cooperating and connecting with the sealing surface reinforcement member 124 with a convex structure can further strengthen the structural strength of the first sealing surface A and ensure the sealing effect of the first sealing surface A.

[0074] In the second aspect, an embodiment of the present invention provides a rear casting of a rear floor structure. This rear casting is the rear casting 2 in the rear floor structure provided in the first aspect of the present invention. The sealing reinforcement structure arranged on both transverse sides of the rear casting 2 forms a transition sealing surface C that can smoothly butt against the sealing surface at the bottom of the front section 1 of the rear floor and the sealing surface at the bottom of the sill side beam, thereby being able to solve the problem of discontinuous sealing surfaces caused by the height difference between the front section 1 of the rear floor and the sill side beam and ensure the airtightness of the passenger compartment. In addition, a plurality of sealing reinforcement structures can be arranged at intervals in the longitudinal direction on the rear casting 2 to meet the requirements of vehicles with different wheelbases, making the rear casting of the rear floor structure provided in the second aspect a platform part and improving the platform generalization rate.

[0075] In the third aspect, an embodiment of the present invention provides a vehicle, including a vehicle body. This vehicle body includes the rear floor structure provided in the first aspect of the present invention or the rear casting of the rear floor structure provided in the second aspect of the present invention. Therefore, it has all its beneficial effects and will not be elaborated here too much.

[0076] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention.

Claims

1. A rear floor structure, characterized in that: It includes the front section assembly of the rear floor (1) and the rear casting (2). A receiving space for accommodating the front section assembly of the rear floor (1) is formed at the front end of the rear casting (2). The transverse two sides of the rear casting (2) are respectively connected to the sill side beams on both sides. A first sealing surface (A) for forming a seal with the battery pack assembly is provided at the bottom of the front section assembly of the rear floor (1), and a second sealing surface (B) for forming a seal with the battery pack assembly is provided at the bottom of the sill side beam. There is a height difference between the first sealing surface (A) and the second sealing surface (B). A seal strengthening structure is provided at the connection between the rear casting (2) and the sill side beam. The seal strengthening structure forms a transition sealing surface (C), and the transition sealing surface (C) smoothly docks with the first sealing surface (A) and the second sealing surface (B) transversely.

2. The rear floor structure according to claim 1, characterized in that: A plurality of the seal strengthening structures each extending transversely are arranged at intervals along the longitudinal direction at the connection between the rear casting (2) and the sill side beam. The seal strengthening structure is a seal strengthening rib (24). The two ends of the seal strengthening rib (24) are respectively docked with the first sealing surface (A) and the second sealing surface (B), and the inclined plane of the seal strengthening rib (24) is the transition sealing surface (C).

3. The rear floor structure according to claim 2, characterized in that: The cross-section of the seal strengthening rib (24) is an inverted trapezoid. The lower base of the trapezoid is in the plane where the first sealing surface (A) is located, and the upper base of the trapezoid is in the plane where the second sealing surface (B) is located.

4. The rear floor structure according to claim 2, characterized in that: The included angle range between the transition sealing surface (C) and the first sealing surface (A) is 135° to 150°.

5. The rear floor structure according to any one of claims 1-4, characterized in that: The seal strengthening structures on the transverse two sides of the rear casting (2) are symmetrically arranged.

6. The rear floor structure according to claim 5, wherein: A plurality of the seal strengthening structures on the same side are arranged at equal intervals along the longitudinal direction.

7. The rear floor structure according to claim 1, characterized in that: The rear casting (2) includes the front section of the rear floor frame (21), the first longitudinal beam of the rear casting (22), and the second longitudinal beam of the rear casting (23). The first longitudinal beam of the rear casting (22) and the second longitudinal beam of the rear casting (23) are arranged on the transverse two sides of the front section of the rear floor frame (21) to form the receiving space. The sill side beam includes the first sill side beam (3) and the second sill side beam (4) which are symmetrically arranged transversely. The first longitudinal beam of the rear casting (22) is laterally connected to the first sill side beam (3), and the second longitudinal beam of the rear casting (23) is laterally connected to the second sill side beam (4).

8. The rear floor structure according to claim 7, wherein: The first longitudinal beam of the rear casting (22) and the second longitudinal beam of the rear casting (23) are structurally symmetric, the first sill side beam (3) and the second sill side beam (4) are structurally symmetric. The first longitudinal beam of the rear casting (22) includes a first overlapping edge (221) and a second overlapping edge (222). The first overlapping edge (221) is connected to the top of the first sill side beam (3), and the second overlapping edge (222) is connected to the side part of the first sill side beam (3).

9. The rear floor structure according to claim 8, characterized in that: The front section assembly (1) of the rear floor includes a front section (11) of the rear floor and a front cross beam assembly (12) of the rear floor. The front cross beam assembly (12) of the rear floor is fixedly connected to the front section (11) of the rear floor. The first sealing surface (A) is provided at the bottom of the front section (11) of the rear floor. The front section (21) of the rear floor skeleton, the first longitudinal beam (22) of the rear casting, and the second longitudinal beam (23) of the rear casting are located on one side of the accommodating space and form a connecting flange (25). The edge of the front section (11) of the rear floor is connected to the lower end surface of the connecting flange (25), and the edge of the front cross beam assembly (12) of the rear floor is connected to the upper end surface of the connecting flange (25).

10. The rear floor structure according to claim 9, characterized in that: The second lapping edge (222) extends downward to exceed the lower end surface of the connecting flange (25), and the sealing strengthening structure is arranged between the lower part of the second lapping edge (222) and the connecting flange (25).

11. The rear floor structure according to claim 9, wherein: The front cross beam assembly (12) of the rear floor includes a front cross beam (121) of the rear floor, a first longitudinal beam (122) of the rear floor, and a second longitudinal beam (123) of the rear floor. The front cross beam (121) of the rear floor is connected to the front ends of the first longitudinal beam (122) and the second longitudinal beam (123) of the rear floor. The transverse two ends of the front cross beam (121) of the rear floor are respectively lapped on the first longitudinal beam (22) of the rear casting and the second longitudinal beam (23) of the rear casting, and the rear ends of the first longitudinal beam (122) and the second longitudinal beam (123) of the rear floor are lapped on the front section (21) of the rear floor skeleton.

12. The rear floor structure according to claim 11, wherein: The part of the front section (11) of the rear floor corresponding to the battery pack sealing strip (5) is recessed downward to form a groove (111) that transversely penetrates the front section (11) of the rear floor. The bottom surface of the groove (111) is the first sealing surface (A). The front cross beam assembly (12) of the rear floor further includes a sealing surface strengthening member (124) arranged horizontally. The sealing surface strengthening member (124) is an upward convex structure corresponding to the groove (111), and the sealing surface strengthening member (124) is cooperatively connected with the groove (111) to form an upper and lower sealed cavity structure.

13. The rear floor structure according to any one of claims 7-12, characterized in that: The front section (21) of the rear floor skeleton, the first longitudinal beam (22) of the rear casting, the second longitudinal beam (23) of the rear casting, and the sealing strengthening structure are integrally formed.

14. A rear casting of a rear floor structure, characterized in that: This rear casting is the rear casting (2) in the rear floor structure according to any one of claims 1-13.

15. A vehicle, characterized in that: It includes a vehicle body, and the vehicle body includes the rear floor structure according to any one of claims 1-13 or the rear floor structure rear casting according to claim 14.

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