Rear floor shared by pure electric vehicle model and extended-range vehicle model and vehicle body mounting structure of rear floor

Abstract

The invention discloses a rear floor shared by a pure electric vehicle model and an extended-range vehicle model and a vehicle body mounting structure thereof, the rear floor comprises a left rear floor longitudinal beam and a right rear floor longitudinal beam, and the front ends of the rear floor longitudinal beams are fixedly connected with connecting pieces which are integrated with the rear floor longitudinal beams and are used for being fixed with battery pack cross beams; a mounting groove for positioning and mounting the oil tank cross beam is formed in the connecting piece; and a common assembly structure for detachably fixing the connecting piece and the battery pack cross beam or detachably fixing the connecting piece and the oil tank cross beam is arranged on the connecting piece. According to the rear floor designed by the invention, the universality of a pure electric vehicle and an extended range vehicle is realized through a common assembly structure, and the rear floor is selectively assembled on a battery pack cross beam or an oil tank cross beam through a connecting piece.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle body structure design, and in particular to a rear floor and a vehicle body mounting structure shared by pure electric and extended-range vehicles. Background Art

[0002] At present, CTC battery packs are widely used in pure electric vehicles. Based on the CTC battery pack, a rear seat crossbeam structure is arranged on the CTC battery pack. When assembling the whole vehicle, the rear floor of the vehicle body needs to be assembled with the rear seat crossbeam. The rear floor of the vehicle body is an empty structure at the rear seat crossbeam. For extended-range models, a fuel tank is arranged at the rear floor of the vehicle body, and the fuel tank needs to be assembled with the rear floor of the vehicle body.

[0003] Therefore, the structures of the rear floors of the current pure electric models and extended-range models are different and cannot be used interchangeably, which leads to complex assembly lines, multiple parts models, and increased vehicle development costs. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a rear floor and a body mounting structure thereof which have a simple structure and can be shared by pure electric vehicles and extended-range vehicles.

[0005] To achieve this purpose, the rear floor designed by the present invention and shared by pure electric and extended-range vehicle models includes two left and right rear floor longitudinal beams, the front end of the rear floor longitudinal beam is fixedly connected with a connecting piece that is an integral structure with the connecting piece and is used to be fixed to the battery pack cross beam; the connecting piece is provided with a mounting groove for positioning and installing the fuel tank cross beam; the connecting piece is provided with a common assembly structure for detachably fixing the connecting piece to the battery pack cross beam or detachably fixing the connecting piece to the fuel tank cross beam.

[0006] The rear floor designed by the present invention realizes the commonality between pure electric vehicles and extended-range vehicles through a shared assembly structure, and the rear floor can be selectively assembled on the battery pack beam or the fuel tank beam through a connector. It has the following advantages and effects:

[0007] Reduce development costs

[0008] Design cost savings: The shared rear floor means that the chassis design work of the car company can be partially shared, and there is no need to carry out completely independent chassis designs for pure electric and extended-range models. This reduces the workload and design difficulty of the design team during the R&D process, thereby reducing design costs.

[0009] Reduced mold costs: A large number of molds are needed to manufacture chassis. If the rear floors of pure electric and extended-range models are not shared, two different sets of molds need to be developed separately. After sharing the rear floor, only one set of molds needs to be developed, or a small amount of modification and adjustment is made to the original mold, which greatly reduces the development and manufacturing costs of molds.

[0010] Improve production efficiency

[0011] Simplified production line: On the production line, the shared rear floor can make the production process of pure electric and extended-range models more similar, reducing the complexity of the production line. Workers do not need to frequently switch production modes and operating procedures, and can produce more quickly and skillfully, improving production efficiency and product consistency.

[0012] Strong versatility of parts: In addition to the rear floor itself, some parts related to the rear floor, such as the suspension system, shock absorbers, etc., can also be used in pure electric and extended-range models. In this way, automakers can purchase and produce in batches, reduce the procurement cost and inventory management cost of parts, and also facilitate the assembly and quality control of parts during the production process.

[0013] Optimize space utilization

[0014] More reasonable interior space layout: Whether it is a pure electric model or an extended-range model, it is necessary to reasonably arrange the battery, engine (range extender), passenger compartment and other parts within the limited body space. The shared rear floor allows car companies to better plan the interior space and avoid unreasonable space layout due to differences in different power systems.

[0015] More trunk space: The shared rear floor also has a positive impact on the trunk space. Since there is no need to design a separate rear floor structure for different power systems, automakers can make better use of the trunk space, improve the trunk storage capacity, and make it easier for users to store luggage and items.

[0016] Improve vehicle performance

[0017] Enhanced chassis rigidity: A well-designed shared rear floor can make the chassis structure more solid and improve chassis rigidity. Improving chassis rigidity is very important for the vehicle's handling performance and driving stability. It can reduce the deformation and vibration of the vehicle during driving, making the vehicle's driving smoother and the control more precise.

[0018] More balanced weight distribution: Pure electric and extended-range models differ in the weight distribution of the power system, but by sharing the rear floor, automakers can optimize the weight distribution of the chassis to make the vehicle's center of gravity more reasonable and improve the vehicle's driving performance and safety performance.

[0019] Convenient after-sales maintenance

[0020] High universality of maintenance technology: For after-sales maintenance personnel, the shared rear floor of pure electric and extended-range vehicles means that they can use similar technologies and methods during maintenance, without having to master two different maintenance skills. This not only reduces the training cost of maintenance personnel, but also improves maintenance efficiency and reduces the waiting time for users.

[0021] More convenient parts supply: The shared rear floor allows some parts of pure electric and extended-range models to be shared, making the supply of parts more convenient during after-sales maintenance. Maintenance personnel can more easily obtain the required parts, reducing maintenance delays caused by parts shortages and improving user satisfaction.

[0022] Furthermore, one end of the connecting member is fixedly connected to the inner surface of the front end of the rear floor longitudinal beam, and the other end extends along the width direction of the rear floor and toward the inner side of the rear floor.

[0023] The advantages of setting the connector based on the rear floor longitudinal beam are as follows:

[0024] 1. Improve structural strength

[0025] 1. Enhance overall rigidity: As an important part of the vehicle chassis, the rear floor longitudinal beam itself has high strength and rigidity. On this basis, the connection parts are set to effectively connect the longitudinal beams to form a more stable frame structure. This structure can better withstand loads from all directions.

[0026] 2. Dispersed stress distribution: When the vehicle is subjected to external forces, stress will be transmitted in the chassis structure. By setting up connectors, the stress can be more evenly dispersed throughout the chassis, avoiding stress concentration in a specific part, thereby reducing the risk of local damage and protecting the safety of passengers.

[0027] Furthermore, the connecting member is provided with a mounting groove for positioning and mounting the end beam section of the fuel tank cross beam.

[0028] Installing and positioning the tank cross member through the mounting groove in the connecting piece has the following advantages:

[0029] 1. Optimize spatial layout

[0030] 1. Reasonable use of space: The rear floor area of ​​the vehicle has limited space. By setting the installation slot at a specific position, the fuel tank crossbeam can be more accurately installed to avoid interference with other components. This design can make full use of the space under the rear floor, making the overall layout of the vehicle more compact and reasonable.

[0031] 2. Improve space utilization: The design of the mounting groove allows the tank crossbeam to be better integrated with the rear floor, reducing the space occupied by the additional mounting structure. This not only leaves more installation space for other components, but also increases the legroom for passengers in the car or the storage space in the trunk, improving the practicality of the vehicle.

[0032] 2. Enhance structural stability

[0033] 1. Fix the tank crossbeam: The mounting groove provides a special mounting position for the tank crossbeam, which can ensure that the crossbeam remains stable during vehicle driving. This fixing method can effectively prevent the tank crossbeam from shifting due to vibration or external force, thereby ensuring the safety and stability of the tank.

[0034] 2. Disperse stress: When the vehicle is subjected to collision or other external forces, the mounting groove can help the tank crossbeam to better disperse stress. By transferring stress to other parts of the rear floor, local stress concentration is reduced, thereby improving the strength and impact resistance of the entire vehicle structure.

[0035] 3. Easy to install and maintain

[0036] 1. Standardized installation: The installation slot makes the installation of the fuel tank crossbeam more standardized and regular. During the production process, workers can install it according to the predetermined position and method, improving installation efficiency and quality stability. At the same time, this standardized installation method is also convenient for quality inspection and control, ensuring that the installation quality of each vehicle meets the requirements.

[0037] 2. Convenient maintenance and replacement: If the fuel tank or fuel tank crossbeam needs to be repaired or replaced, the design of the mounting slot can make the maintenance process more convenient and quick. Maintenance personnel can more easily find the location of the fuel tank crossbeam and perform removal and installation operations. This greatly shortens maintenance time and reduces maintenance costs.

[0038] 4. Improve vehicle performance

[0039] 1. Lower the center of gravity: Installing the fuel tank crossbeam in the installation slots on the left and right sides of the front part of the rear floor can make the fuel tank closer to the bottom of the vehicle, thereby lowering the center of gravity of the vehicle. A lower center of gravity helps improve the stability and handling performance of the vehicle, especially when driving at high speed or making sharp turns, and can reduce the roll and shaking of the vehicle.

[0040] 2. Improve fuel supply: Reasonably set mounting slots can make the tank beam better support the tank, ensuring that the tank can maintain a stable position under various driving conditions. This helps to improve the working stability of the fuel supply system, reduce fuel sloshing and bubble generation, and improve the working efficiency of the fuel pump, thereby ensuring the normal operation of the engine.

[0041] Furthermore, the connecting member includes a U-shaped bent plate structure with an open bottom, and the space enclosed by the U-shaped bent plate structure includes the installation groove.

[0042] The structural connection of the fuel tank beam or battery pack beam through the U-shaped bending plate has the following advantages:

[0043] 1. Enhance connection strength

[0044] 1. High structural stability: The U-shaped bending plate has a unique geometric shape, which enables it to better disperse stress when subjected to external forces. When connecting the tank beam or battery pack beam, the U-shaped bending plate can provide support in multiple directions, thereby enhancing the overall stability of the connection.

[0045] 2. Good torsional resistance: When a vehicle turns or is subjected to lateral force, torque will be generated. The structure of the U-shaped bending plate can increase the torsional resistance of the connection part and prevent the crossbeam from twisting or deforming under the action of torque. Compared with the traditional flat plate connection method, the U-shaped bending plate can better transmit torque, allowing the tank crossbeam or battery pack crossbeam to work together to improve the overall rigidity of the vehicle.

[0046] 3. Strong load-bearing capacity: U-shaped bending plate is usually made of high-strength materials and has a high load-bearing capacity. When connecting the crossbeam, it can bear the weight from the fuel tank or seat, as well as various dynamic loads generated during the vehicle's driving. The structure of the U-shaped bending plate can ensure that the crossbeam remains stable under heavy load conditions, providing reliable support for the vehicle.

[0047] 2. Improve safety

[0048] When a vehicle collides, the U-shaped bending plate structure can play a certain role in buffering, absorbing part of the collision energy and reducing the impact on the fuel tank and rear seats. At the same time, it can also transfer the collision force to other structural components of the vehicle, dispersing the collision energy and improving the overall safety of the vehicle.

[0049] 3. Reduce costs

[0050] The manufacturing process of U-shaped bending plate is relatively simple, and it can be quickly formed through stamping, bending and other processes. This manufacturing method can reduce production costs and improve production efficiency. Compared with complex welding or casting processes, the manufacturing process of U-shaped bending plate is easier to control quality and reduce scrap rate, thereby reducing overall production costs.

[0051] Furthermore, the common assembly structure includes a plurality of bolt through holes opened on the front panel, the top panel and the rear panel of the connecting member.

[0052] The battery pack crossbeam or fuel tank crossbeam can be connected to the connector through bolts and nuts through the bolt through-hole structure, and the operation is relatively simple. On the vehicle production line, workers can use standard tools to quickly connect the fuel tank crossbeam or battery pack crossbeam to the rear floor longitudinal beam to improve production efficiency. Compared with some complex welding or riveting processes, bolt and nut connections do not require special equipment and professional skills, reducing production difficulty and cost. If the fuel tank crossbeam or battery pack crossbeam is damaged or needs to be replaced during the use of the vehicle, the bolt and nut connection method allows maintenance personnel to easily disassemble it for repair or replace new parts. This detachable connection method greatly shortens maintenance time, reduces maintenance costs, and improves the maintainability of the vehicle.

[0053] Furthermore, the bottom of the front end surface of the rear floor longitudinal beam is fixedly connected with a flange extending from the outer side of the rear floor longitudinal beam to the inner side of the connecting member and is used to be fixed to the surface of the battery pack or to the rear part of the floor in the vehicle body.

[0054] The flanged structure further strengthens the structural strength of the connection between the rear floor longitudinal beam and the floor of the battery pack or the vehicle body, while increasing the structural strength of the connecting parts and their connection structural strength.

[0055] Furthermore, a body mounting structure of a rear floor shared by pure electric and extended-range vehicles includes a battery pack mounting structure and a fuel tank mounting structure of the rear floor; the battery pack mounting structure of the rear floor includes a battery pack and a battery pack beam fixed to the battery pack, and the two ends of the battery pack beam are respectively detachably fixed to the common assembly structure of the two connecting parts; the fuel tank mounting structure of the rear floor includes a fuel tank beam and a fuel tank, and the two ends of the fuel tank beam are respectively detachably fixed to the two connecting parts through two common assembly structures.

[0056] Furthermore, both ends of the battery pack crossbeam are detachably fixed to the common assembly structure of the two connecting pieces through a transition connecting piece.

[0057] Connecting the battery pack crossbeam and the rear floor longitudinal beam through a transition connector has the following advantages:

[0058] 1. Optimize structural design

[0059] 1. Adapt to different shapes and sizes: Battery pack beams and connectors may have different shapes, sizes and geometric features. Transition connectors can be designed according to the specific conditions of the two to achieve a smooth transition connection and overcome the connection difficulties caused by shape and size differences.

[0060] 2. Improve structural flexibility: Using transition connectors can increase structural flexibility, allowing designers to better adjust the layout of the battery pack and rear floor. This flexibility helps optimize the overall structure of the vehicle, improve space utilization, and meet different vehicle models and design requirements.

[0061] 2. Enhance connection strength

[0062] 1. Disperse stress: The transition connector can evenly disperse the stress between the battery pack crossbeam and the rear floor longitudinal beam to avoid stress concentration in a specific part. This stress dispersion effect can improve the strength and durability of the connection part and reduce the risk of damage to the connection part.

[0063] 2. Increase the connection area: Transition connectors usually have a larger connection area, which can increase the contact area between the battery pack crossbeam and the rear floor longitudinal beam. This effect of increasing the connection area can improve the strength and stability of the connection and reduce the looseness and deformation of the connection.

[0064] 3. Easy to install and maintain

[0065] 1. Standardized connection: Transition connectors can be designed and manufactured in a standardized manner, making the connection between the battery pack crossbeam and the rear floor longitudinal beam more standardized and unified. This standardized connection method can improve production efficiency, reduce production costs, and facilitate installation and maintenance.

[0066] 2. Disassembly: Transition connectors usually use detachable connection methods, such as bolt connection, snap connection, etc. This disassembly makes it easier to separate the battery pack and the rear floor, and facilitates the maintenance and replacement of the battery pack or the rear floor longitudinal beam.

[0067] 4. Improve vehicle performance

[0068] 1. Reduce noise and vibration: Transition connectors can play a certain role in shock absorption and noise reduction. By rationally designing the material and structure of transition connectors, the vibration transmission between the battery pack and the rear floor longitudinal beam can be reduced, the noise and vibration level during vehicle driving can be reduced, and the ride comfort can be improved.

[0069] 2. Optimize the center of gravity of the vehicle: The position and design of the transition connector can affect the installation height and position of the battery pack and the rear floor longitudinal beam, thereby affecting the center of gravity of the vehicle. By rationally designing the transition connector, the center of gravity distribution of the vehicle can be optimized, and the handling performance and stability of the vehicle can be improved.

[0070] Furthermore, the fuel tank is fixed to the rear floor and the fuel tank cross beam by means of straps.

[0071] The fuel tank is fixed to the rear floor with straps, which has the following advantages:

[0072] 1. Easy and efficient installation

[0073] 1. Quick installation: The strapping method is relatively simple. When installing the fuel tank, workers can quickly wrap the strap around the tank and fix it to the rear floor. Compared with some complicated installation methods such as welding or bolting, strapping greatly saves installation time and improves production efficiency.

[0074] 2. No special tools required: The fuel tank is usually installed without special tools, and ordinary wrenches or pliers can be used to complete the installation. This reduces the installation cost and also facilitates maintenance and replacement.

[0075] 2. Good shock absorption effect

[0076] 1. Absorb vibration: The vehicle will generate various vibrations during driving. The straps have a certain elasticity, which can absorb these vibrations and reduce the shaking and impact of the fuel tank. This helps to protect the fuel tank and extend its service life.

[0077] 2. Reduce noise: The shock-absorbing effect of the strap can also reduce the noise generated by the fuel tank during driving. The shaking and vibration of the fuel tank will generate noise, affecting the quiet environment inside the car. The strap can reduce this noise and improve riding comfort. Especially when driving at high speeds, the shock-absorbing effect of the strap is particularly important for reducing noise.

[0078] 3. Flexible adjustment of position

[0079] 1. Adapt to different fuel tank sizes: The straps can be adjusted according to the size of the fuel tank and are suitable for fuel tanks of different sizes and shapes. This allows automakers to use fuel tanks of different specifications on the same model, improving production flexibility.

[0080] 2. Easy to repair and replace: If the fuel tank needs to be repaired or replaced, the strapping method allows for easy removal of the fuel tank. Simply loosen the straps to remove the fuel tank from the rear floor for repair or replacement. Compared with other fixing methods, the fuel tank tied with straps is easier to repair and replace, reducing repair costs and time.

[0081] 4. Low cost

[0082] 1. Low material cost: Bandages are usually made of rubber, nylon or other synthetic materials, which are low-cost and easy to obtain. Compared with some expensive metal fixings or welding equipment, the cost of bandages is much lower. For automakers, using bandages to tie fuel tanks can reduce production costs and improve product competitiveness.

[0083] 2. Low installation cost: As mentioned before, the installation method of strapping is simple and quick, and does not require special tools and equipment, so the installation cost is also low. This can save a lot of installation costs for mass-produced cars.

[0084] Furthermore, the left and right sides of the fuel tank are pressed and positioned with the bottom of the rear floor longitudinal beams on the left and right sides of the rear floor.

[0085] Positioning the fuel tank by the rear floor longitudinal beam can effectively prevent the fuel tank from loosening, which is crucial to the safe driving of the vehicle and avoids fuel leakage or other safety accidents caused by a loose fuel tank.

[0086] The beneficial effects of the present invention are as follows: the rear floor designed by the present invention realizes the commonality of pure electric vehicles and extended-range vehicles through a shared assembly structure, and the rear floor can be selectively assembled on the battery pack beam or the fuel tank beam through a connector. The development cost is reduced, and the design work of the chassis part of the car company can be partially common, and there is no need to carry out completely independent chassis designs for pure electric and extended-range models. The workload and design difficulty of the design team in the research and development process are reduced, thereby reducing the design cost. After sharing the rear floor, only one set of molds needs to be developed, or a small amount of modifications and adjustments are made on the basis of the original mold, which greatly reduces the development and manufacturing costs of the mold. On the production line, the shared rear floor can make the production process of pure electric and extended-range models more similar, reducing the complexity of the production line. Workers do not need to frequently switch production modes and operating procedures, and can produce more quickly and skillfully, improving production efficiency and product consistency. In addition to the rear floor itself, some parts related to the rear floor, such as suspension systems, shock absorbers, etc., can also be used in pure electric and extended-range models. In this way, car companies can carry out batch procurement and production, reduce the procurement cost and inventory management cost of parts, and also facilitate the assembly and quality control of parts during the production process. The shared rear floor allows car companies to better plan the interior space and avoid unreasonable space layout due to differences in different power systems. Since there is no need to design the rear floor structure separately for different power systems, car companies can make more full use of the trunk space, improve the storage capacity of the trunk, and facilitate users to store luggage and items. A reasonably designed shared rear floor can make the structure of the chassis more solid and improve the rigidity of the chassis. The improvement of chassis rigidity is very important for the handling performance and driving stability of the vehicle. It can reduce the deformation and vibration of the vehicle during driving, making the vehicle's driving smoother and the control more precise. Pure electric and extended-range models have different weight distributions of the power system, but by sharing the rear floor, car companies can optimize the weight distribution of the chassis to make the center of gravity of the vehicle more reasonable and improve the driving performance and safety performance of the vehicle. For after-sales maintenance personnel, the shared rear floor of pure electric and extended-range means that they can use similar technologies and methods during maintenance, and do not need to master two different maintenance skills separately. This not only reduces the training cost of maintenance personnel, but also improves maintenance efficiency and reduces the waiting time for users. The shared rear floor allows some parts of pure electric and extended-range models to be shared, making the supply of parts more convenient during after-sales maintenance. Maintenance personnel can more easily obtain the required parts, reducing maintenance delays caused by parts shortages and improving user satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] Figure 1 A three-dimensional view of the rear floor in the present invention, in which the rear floor is located above the battery pack and is ready for assembly;

[0088] Figure 2A right side view of the rear floor in the present invention, in which the rear floor is located above the battery pack and is ready for assembly;

[0089] Figure 3 A top view of the assembly position of the rear floor in the present invention where the rear floor is located above the battery pack;

[0090] Figure 4 A top view of the rear floor assembly fixed to the battery pack by fixing the transition connector and the connector in the present invention;

[0091] Figure 5 A three-dimensional diagram showing the relative arrangement of the fuel tank and the rear floor panel without the fuel tank cross beam installed in the present invention;

[0092] Figure 6 A three-dimensional diagram of the assembly of the fuel tank and the rear floor with the fuel tank cross beam installed in the present invention;

[0093] Figure 7 It is a front perspective view of the fuel tank cross beam of the present invention installed on the rear floor;

[0094] Figure 8 It is a vertical cross-sectional view of the fixed connection structure between the binding belt and the tank cross beam in the present invention;

[0095] Among them, 1 is the rear floor longitudinal beam, 2 is the battery pack cross beam, 3 is the connecting piece, 4 is the fuel tank cross beam, 5 is the mounting groove, 6 is the bolt hole, 7 is the battery pack, 8 is the flange, 9 is the transition connecting piece, 10 is the fuel tank, 11 is the cross beam seat bracket, 12 is the fuel tank shock pad, 13 is the fuel tank fixing bolt, 14 is the rivet nut, and 15 is the binding strap. DETAILED DESCRIPTION

[0096] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0097] In certain embodiments, such as Figure 1—8 shows a rear floor shared by the pure electric and extended-range vehicles, and the rear floor comprises two left and right rear floor longitudinal beams 1, the front end of which is fixedly connected with a connector 3 which is an integral structure with the rear floor longitudinal beam 1 and is used to be fixed to the battery pack cross beam 2; a mounting groove 5 for positioning and installing the fuel tank cross beam 4 is provided in the connector 3; a common assembly structure for detachably fixing the connector 3 to the battery pack cross beam 2 or detachably fixing the connector 3 to the fuel tank cross beam 4 is provided on the connector 3.

[0098] Embodiment 1

[0099] Based on the above rear floor, a preferred arrangement structure of the connecting member 3 is designed: one end of the connecting member 3 is fixedly connected to the front inner surface of the rear floor longitudinal beam 1, and the other end extends along the width direction of the rear floor and toward the inner side of the rear floor.

[0100] Embodiment 2

[0101] On the basis of the first embodiment, a preferred design structure of the connecting member 3 is designed: a mounting groove 5 for positioning and mounting the end beam section of the tank cross beam 4 is provided in the connecting member 3. The connecting member 3 is a U-shaped bent plate structure with an open bottom, and the space enclosed by the U-shaped bent plate structure is the mounting groove 5.

[0102] Embodiment 3

[0103] On the basis of the first or second embodiment, a preferred structure of a common assembly structure is designed: the common assembly structure includes a plurality of bolt through holes 6 opened on the front panel, the top panel and the rear panel of the connecting member 3 .

[0104] Embodiment 4

[0105] Based on the first, second or third embodiment, the connection between the connecting member 3 and the rear floor longitudinal beam 1 is further optimized: the bottom of the front end surface of the rear floor longitudinal beam 1 is fixedly connected with a flange 8 extending from the outer side of the rear floor longitudinal beam 1 to the inner side of the connecting member 3 and used for fixing to the surface of the battery pack 7 or to the rear part of the floor in the vehicle body.

[0106] Based on the structure of the rear floor, a vehicle body mounting structure of the rear floor is designed, including a battery pack mounting structure of the rear floor and a fuel tank mounting structure of the rear floor.

[0107] In certain embodiments, such as Figure 1 —As shown in FIG8 , the battery pack mounting structure of the rear floor includes a battery pack 7 and a battery pack cross beam 2 fixed on the battery pack 7, and the two ends of the battery pack cross beam 2 are detachably fixed to the two connecting parts 3 by means of a bolt and nut structure and a plurality of bolt through holes 6; the fuel tank mounting structure of the rear floor includes a fuel tank cross beam 4 and a fuel tank 10, and the two ends of the fuel tank cross beam 4 are detachably fixed to the two connecting parts 3 by means of a bolt and nut structure and a plurality of bolt through holes 6.

[0108] Embodiment 5

[0109] Based on the above-mentioned vehicle body mounting structure of the rear floor, the connection structure between the battery pack cross beam 2 and the connecting member 3 is optimized and designed: Figure 1 As shown in FIG. 4 , the two ends of the battery pack cross beam 2 are respectively connected with a transition connector 9, and the transition connector 9 is detachably fixed to the multiple bolt holes 6 of the two connectors 3 and the through holes (such as Figure 3 As shown), the transition connector 9 is a U-shaped bent plate structure.

[0110] Embodiment 6

[0111] Based on the structure of the rear floor, the installation structure of the fuel tank 10 is optimized: Figure 5 As shown in FIG. 8 , the fuel tank 10 is fixed to the rear floor and the fuel tank cross beam 4 by means of a strap 15 , and the left and right sides of the fuel tank 10 are pressed and positioned against the bottom of the rear floor longitudinal beam 1 on the left and right sides of the rear floor.

[0112] In summary, the rear floor designed in the present invention realizes the commonality of pure electric vehicles and extended-range vehicles through a shared assembly structure. The rear floor can be selectively assembled on the battery pack cross beam 2 or the fuel tank cross beam 4 through the connecting piece 3. The cross beam seat bracket 11 (such as Figure 4 and 7As shown in the figure, it is used as the rear seat crossbeam, which reduces the development cost. The design work of the chassis part of the car company can be partially common, and there is no need to carry out completely independent chassis design for pure electric and extended-range models. The workload and design difficulty of the design team in the research and development process are reduced, thereby reducing the design cost. After sharing the rear floor, only one set of molds needs to be developed, or a small amount of modification and adjustment is made on the basis of the original mold, which greatly reduces the development and manufacturing costs of the mold. On the production line, the shared rear floor can make the production process of pure electric and extended-range models more similar, reducing the complexity of the production line. Workers do not need to frequently switch production modes and operating procedures, and can produce more quickly and skillfully, improving production efficiency and product consistency. In addition to the rear floor itself, some parts related to the rear floor, such as suspension systems, shock absorbers, etc., can also be used in pure electric and extended-range models. In this way, car companies can carry out batch procurement and production, reduce the procurement cost and inventory management cost of parts, and also facilitate the assembly and quality control of parts in the production process. The shared rear floor can enable car companies to better plan the interior space and avoid unreasonable space layout due to differences in different power systems. Since there is no need to design the rear floor structure separately for different power systems, car companies can make more full use of the trunk space, improve the storage capacity of the trunk, and facilitate users to store luggage and items. A reasonably designed shared rear floor can make the structure of the chassis more solid and improve the rigidity of the chassis. The improvement of chassis rigidity is very important for the handling performance and driving stability of the vehicle. It can reduce the deformation and vibration of the vehicle during driving, making the vehicle's driving smoother and the control more precise. Pure electric and extended-range models have different weight distributions of the power system, but by sharing the rear floor, car companies can optimize the weight distribution of the chassis to make the center of gravity of the vehicle more reasonable and improve the driving performance and safety performance of the vehicle. For after-sales maintenance personnel, the shared rear floor of pure electric and extended-range means that they can use similar technologies and methods during maintenance, and do not need to master two different maintenance skills separately. This not only reduces the training cost of maintenance personnel, but also improves maintenance efficiency and reduces the waiting time for users to maintain maintenance. The shared rear floor makes some parts of pure electric and extended-range models universal, and the supply of parts is more convenient during after-sales maintenance. Maintenance personnel can more easily obtain the required parts, reducing maintenance delays caused by parts shortages and improving user satisfaction.

[0113] It should be noted here that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims. In the case of using "including", "having" and "comprising" described in this specification, there may also be another part or other parts, and the terms used may generally be singular but may also represent plural forms.

[0114] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A rear floor shared by pure electric and extended-range vehicles, comprising two left and right rear floor longitudinal beams (1), characterized in that: The front end of the rear floor longitudinal beam (1) is fixedly connected to a connecting piece (3) which is an integral structure with the rear floor longitudinal beam and is used to be fixed to the battery pack cross beam (2); The connecting member (3) is provided with a mounting groove (5) for positioning and mounting the oil tank cross beam (4); The connecting member (3) is provided with a common assembly structure for detachably fixing the connecting member (3) to the battery pack cross beam (2) or detachably fixing the connecting member (3) to the fuel tank cross beam (4).

2. The rear floor shared by pure electric and extended-range vehicles as claimed in claim 1, characterized in that: One end of the connecting piece (3) is fixedly connected to the inner surface of the front end of the rear floor longitudinal beam (1), and the other end extends along the width direction of the rear floor and toward the inner side of the rear floor.

3. The rear floor shared by pure electric and extended-range vehicles as claimed in claim 2, characterized in that: The connecting piece (3) is provided with a mounting groove (5) for positioning and mounting the end beam section of the oil tank cross beam (4).

4. The rear floor shared by pure electric and extended-range vehicles as claimed in claim 3, characterized in that: The connecting piece (3) comprises a U-shaped bent plate structure with an open bottom, and the space enclosed by the U-shaped bent plate structure comprises the installation groove (5).

5. The rear floor shared by pure electric and extended-range vehicles as claimed in claim 4, characterized in that: The common assembly structure comprises a plurality of bolt through holes (6) opened on the front panel, the top panel and the rear panel of the connecting member (3).

6. The rear floor shared by pure electric and extended-range vehicles as claimed in any one of claims 1 to 5, characterized in that: The bottom of the front end surface of the rear floor longitudinal beam (1) is fixedly connected to a flange (8) extending from the outer side of the rear floor longitudinal beam (1) to the inner side of the connecting member (3) and used for fixing to the surface of the battery pack (7) or to the rear part of the floor in the vehicle body.

7. A vehicle body mounting structure for a rear floor shared by a pure electric vehicle and an extended-range vehicle as claimed in any one of claims 1 to 6, characterized in that: It includes a battery pack mounting structure on the rear floor and a fuel tank mounting structure on the rear floor; The battery pack installation structure of the rear floor comprises a battery pack (7) and a battery pack crossbeam (2) fixed to the battery pack (7), and both ends of the battery pack crossbeam (2) are detachably fixed to the common assembly structure of the two connecting members (3); The oil tank installation structure of the rear floor comprises an oil tank cross beam (4) and an oil tank (10), and the two ends of the oil tank cross beam (4) are detachably fixed in the two connecting parts (3) through two common assembly structures.

8. The vehicle body mounting structure of the rear floor shared by pure electric and extended-range vehicles as claimed in claim 7, characterized in that: The two ends of the battery pack crossbeam (2) are detachably fixed to the common assembly structure of the two connecting members (3) via a transition connecting member (9).

9. The vehicle body mounting structure of the rear floor shared by pure electric and extended-range vehicles as claimed in claim 7, characterized in that: The fuel tank (10) is fixed to the rear floor and the fuel tank cross beam (4) by means of binding straps (15).

10. The vehicle body mounting structure of the rear floor shared by pure electric and extended-range vehicles as claimed in claim 9, characterized in that: The left and right sides of the oil tank (10) are pressed and positioned with the bottom of the rear floor longitudinal beam (1) on the left and right sides of the rear floor.

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