A rear floor shared by a pure electric vehicle and a range-extended vehicle and a body mounting structure thereof

Abstract

The application discloses a rear floor shared by pure electric and extended range vehicle models and a body mounting structure thereof, comprising two rear floor longitudinal beams, the front end of the rear floor longitudinal beam is fixedly connected with a connecting piece which is an integral structure and is used for fixing a battery pack cross beam, an installation groove for positioning and installing an oil tank cross beam is arranged in the connecting piece, and a shared assembly structure for detachably fixing the connecting piece with the battery pack cross beam or detachably fixing the connecting piece with the oil tank cross beam is arranged on the connecting piece. The rear floor designed in the application is shared by pure electric and extended range vehicles through the shared assembly structure, and the rear floor is selectively assembled on the battery pack cross beam or the oil tank cross beam through the connecting piece.

Description

TECHNICAL FIELD

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

[0002] At present, CTC battery packs are widely used in pure electric vehicles. Based on the CTC battery pack, a rear seat beam 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 beam. The rear floor of the vehicle body is an empty structure at the rear seat beam. The extended range vehicle is arranged with a fuel tank 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 floor of the vehicle body used and assembled by the current pure electric vehicle and the extended range vehicle are different, which cannot be shared, resulting in complex production line assembly, multiple part models, and increased development cost of the vehicle model. SUMMARY

[0004] The purpose of the present application is to solve the above-mentioned problems in the background art, and to provide a rear floor shared by pure electric and extended range vehicles and a vehicle body mounting structure thereof.

[0005] To achieve this purpose, the rear floor shared by pure electric and extended range vehicles designed by the present application comprises two rear floor longitudinal beams, the front end of the rear floor longitudinal beam is fixedly connected with a connecting piece which is an integral structure and is used for fixing with a battery pack beam; the connecting piece is provided with a mounting groove for positioning and mounting a fuel tank beam; the connecting piece is provided with a shared assembly structure for detachably fixing the connecting piece with the battery pack beam or detachably fixing the connecting piece with the fuel tank beam.

[0006] The rear floor designed by the present application realizes the sharing of pure electric vehicles and extended range vehicles through the shared assembly structure. The rear floor is selectively assembled on the battery pack beam or the fuel tank beam through the connecting piece. The present application has the following advantages and effects:

[0007] Reduced development cost

[0008] Design cost saving: sharing the rear floor means that the design work of the vehicle enterprise in the chassis part can be partially shared, and it is not necessary to separately design the chassis for pure electric and extended range vehicles. The workload and design difficulty of the design team in the research and development process are reduced, thereby reducing the design cost.

[0009] Mold cost reduction: Manufacturing the chassis requires the use of a large number of molds. If the rear floor of the pure electric and extended range models is not shared, two different sets of molds need to be developed respectively. After sharing the rear floor, only one set of molds needs to be developed, or a small amount of modification and adjustment needs to be made based on the original molds, greatly reducing the development and manufacturing costs of the molds.

[0010] Improved production efficiency

[0011] Simplified production line: On the production line, sharing the rear floor can make the production processes 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 operation processes, and can produce more quickly and skillfully, improving production efficiency and product consistency.

[0012] Strong parts commonality: In addition to the rear floor itself, some parts related to the rear floor, such as the suspension system and shock absorber, can also be used in pure electric and extended range models. In this way, car manufacturers can purchase and produce in bulk, reducing the procurement cost and inventory management cost of parts, and also facilitating the assembly and quality control of parts in the production process.

[0013] Optimized space utilization

[0014] More reasonable interior space layout: Whether it is a pure electric vehicle or an extended range vehicle, it is necessary to reasonably arrange the battery, engine (range extender), passenger compartment and other parts in the limited vehicle body space. Sharing the rear floor can help car manufacturers better plan the interior space, avoiding unreasonable space layout due to differences in different power systems.

[0015] More spacious trunk: The sharing of the rear floor also has a positive impact on the trunk space. Since the rear floor structure does not need to be designed separately for different power systems, car manufacturers can make full use of the trunk space, improve the storage capacity of the trunk, and facilitate users to store luggage and items.

[0016] Enhanced vehicle performance

[0017] Increased chassis rigidity: A well-designed shared rear floor can make the chassis structure more solid and improve the rigidity of the chassis. The improvement of the rigidity of the chassis is very important for the handling performance and driving stability of the vehicle, which can reduce the deformation and vibration of the vehicle during driving, making the vehicle drive more smoothly and handle more accurately.

[0018] More balanced weight distribution: Pure electric and extended range vehicles have different weight distribution of power systems, but through the sharing of the rear floor, car manufacturers can optimize and adjust the weight distribution of the chassis, making the center of gravity of the vehicle more reasonable, improving the driving performance and safety performance of the vehicle.

[0019] Convenient after-sales maintenance

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

[0021] Convenient parts supply: The common rear floor allows some parts of the pure electric and extended range vehicles to be used in common, making the supply of parts more convenient during after-sales maintenance. Maintenance personnel can more easily obtain the required parts, reducing maintenance delays due to parts shortages and improving user satisfaction.

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

[0023] Setting the connecting piece based on the rear floor longitudinal beam has the following benefits:

[0024] I. Improve structural strength

[0025] 1. Enhance overall rigidity: The rear floor longitudinal beam, as an important part of the vehicle chassis, has high strength and rigidity. On this basis, the connecting piece is set to effectively connect the longitudinal beams, forming a more stable frame structure. This structure can better withstand loads from all directions.

[0026] 2. Disperse stress distribution: When the vehicle is subjected to external forces, stress will be transmitted in the chassis structure. By setting the connecting piece, stress can be more evenly distributed throughout the chassis, avoiding stress concentration in a particular part, thereby reducing the risk of local damage and protecting passenger safety.

[0027] Further, the connecting piece is internally provided with the mounting slot for positioning and mounting the end beam segment of the oil tank cross beam.

[0028] Mounting and positioning the oil tank cross beam through the mounting slot in the connecting piece has the following benefits:

[0029] I. Optimize space layout

[0030] 1. Rational use of space: The rear floor area of the vehicle has limited space. By setting the mounting slot at a specific location, a suitable mounting position for the oil tank cross beam can be found more accurately, avoiding interference with other components. This design can fully utilize the space below the rear floor, making the overall layout of the vehicle more compact and reasonable.

[0031] 2. Improved space utilization: The design of the installation slots allows the fuel tank cross beam to better integrate with the rear floor, reducing the space occupied by additional mounting structures. This not only leaves more installation space for other components, but also increases the legroom for passengers or storage space in the trunk, improving the practicality of the vehicle.

[0032] II. Enhanced structural stability

[0033] 1. Secure fuel tank cross beam: The installation slots provide a dedicated mounting position for the fuel tank cross beam, ensuring its stability during vehicle operation. This secure mounting effectively prevents displacement of the cross beam due to vibration or external forces, ensuring the safety and stability of the fuel tank.

[0034] 2. Stress dispersion: When the vehicle is subjected to impact or other external forces, the installation slots help the fuel tank cross beam better disperse stress. By transmitting stress to other parts of the rear floor, local stress concentration is reduced, improving the strength and impact resistance of the entire vehicle structure.

[0035] III. Easy installation and maintenance

[0036] 1. Standardized installation: The installation slots make the installation of the fuel tank cross beam more standardized and regulated. During production, workers can install according to predetermined positions and methods, improving installation efficiency and quality stability. At the same time, this standardized installation method also facilitates quality testing and control, ensuring that the installation quality of each vehicle meets the requirements.

[0037] 2. Easy maintenance and replacement: If the fuel tank or fuel tank cross beam needs to be repaired or replaced, the design of the installation slots can make the maintenance process more convenient and efficient. Maintenance personnel can more easily locate the fuel tank cross beam and perform disassembly and installation operations. This greatly shortens the maintenance time and reduces maintenance costs.

[0038] IV. Improved vehicle performance

[0039] 1. Lower center of gravity: Installing the fuel tank cross beam in the installation slots on both sides of the rear floor front can make the position of the fuel tank closer to the bottom of the vehicle, thereby lowering the center of gravity. A lower center of gravity helps improve the stability and handling performance of the vehicle, especially at high speeds or sharp turns, reducing vehicle roll and sway.

[0040] 2. Improved fuel supply: Reasonably designed installation slots can better support the fuel tank with the fuel tank cross beam, ensuring that the fuel tank maintains a stable position under various driving conditions. This helps improve the stability of the fuel supply system, reduces fuel sloshing and bubble formation, and improves the efficiency of the fuel pump, ensuring the normal operation of the engine.

[0041] Further, the connecting piece comprises a U-shaped bent plate structure with an open bottom, and a space surrounded by the U-shaped bent plate structure comprises the mounting groove.

[0042] Connecting the oil tank cross beam or the battery pack cross beam through the U-shaped bent plate structure has the following benefits:

[0043] I. Enhance the connection strength

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

[0045] 2. Good torsional performance: When the vehicle turns or is subjected to lateral force, torque will be generated. The structure of the U-shaped bent plate can increase the torsional performance of the connection site, preventing the cross beam from twisting or deforming under the action of torque. Compared with the traditional flat plate connection method, the U-shaped bent plate can better transmit torque, making the oil tank cross beam or the battery pack cross beam work together, and improving the overall rigidity of the vehicle.

[0046] 3. Strong carrying capacity: The U-shaped bent plate is usually made of high-strength materials and has high carrying capacity. When connecting the cross beam, it can withstand the weight from the oil tank or the seat, as well as various dynamic loads generated during vehicle driving. The structure of the U-shaped bent plate can ensure that the cross beam remains stable under heavy load conditions, providing reliable support for the vehicle.

[0047] II. Improve safety

[0048] In the event of a vehicle collision, the structure of the U-shaped bent plate can act as a certain buffer, absorbing part of the collision energy and reducing the impact on the oil tank and rear seats. At the same time, it can also transmit the collision force to other structural components of the vehicle, dispersing the collision energy and improving the overall safety of the vehicle.

[0049] III. Reduce costs

[0050] The manufacturing process of the U-shaped bent plate is relatively simple and 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 the U-shaped bent plate is easier to control quality and reduce waste, thereby reducing overall production costs.

[0051] Further, the shared assembly structure comprises a plurality of bolt through holes formed on the front panel, top panel and rear panel of the connecting piece.

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

[0053] Further, the bottom of the front end face 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 piece, for fixing with the surface of the battery pack or the rear part of the middle floor of the vehicle body.

[0054] The flange further strengthens the connection strength between the rear floor longitudinal beam and the battery pack or the middle floor of the vehicle body, while increasing the structural strength of the connecting piece and its connection strength.

[0055] Further, a rear floor body mounting structure shared by pure electric and extended range vehicle models includes a battery pack mounting structure of the rear floor 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 cross beam fixed on the battery pack, both ends of the battery pack cross beam are detachably fixed on the shared assembly structures of two connecting pieces; the fuel tank mounting structure of the rear floor includes a fuel tank cross beam and a fuel tank, both ends of the fuel tank cross beam are detachably fixed in two connecting pieces through two shared assembly structures.

[0056] Further, both ends of the battery pack cross beam are detachably fixed on the shared assembly structures of two connecting pieces through a transition connecting piece.

[0057] Connecting the battery pack cross beam and the rear floor longitudinal beam through the transition connecting piece has the following advantages and effects:

[0058] I. Optimize structure design

[0059] 1. Adapt to different shapes and sizes: The battery pack cross beam and the connecting piece may have different shapes, sizes and geometric characteristics. The transition connecting piece can be designed according to the specific circumstances of the two, achieving smooth transition connection and overcoming the connection difficulties caused by shape and size differences.

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

[0061] II. Enhanced connection strength

[0062] 1. Dispersing stress: Transition connectors can evenly distribute the stress between the battery pack cross beam and the rear floor longitudinal beam, avoiding stress concentration in a specific location. This stress dispersion can improve the strength and durability of the connection site, reducing the risk of damage to the connection site.

[0063] 2. Increased connection area: Transition connectors usually have a larger connection area, which can increase the contact area between the battery pack cross beam and the rear floor longitudinal beam. This increased connection area can improve the strength and stability of the connection, reducing the loosening and deformation of the connection site.

[0064] III. Easy installation and maintenance

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

[0066] 2. Detachable: Transition connectors usually use detachable connection methods, such as bolt connection, buckle connection, etc. This detachability makes it easier to separate the battery pack and the rear floor, facilitating the repair and replacement of the battery pack or the rear floor longitudinal beam.

[0067] IV. Improved vehicle performance

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

[0069] 2. Optimize vehicle center of gravity: 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 reasonably designing the transition connector, the center of gravity distribution of the vehicle can be optimized, improving the handling performance and stability of the vehicle.

[0070] Further, the fuel tank is fixed to the rear floor and the fuel tank cross beam by a strap.

[0071] Fixing the fuel tank to the rear floor by a strap has the following advantages:

[0072] I. Easy and efficient installation

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

[0074] 2. No need for special tools: Strap binding fuel tanks usually do not require special tools, and ordinary tools such as wrenches or pliers can complete the installation. This reduces installation costs and also facilitates maintenance and replacement.

[0075] II. Good shock absorption effect

[0076] 1. Absorbing vibrations: Vehicles produce various vibrations during driving, and straps have a certain elasticity that can absorb these vibrations, reducing the shaking and impact of the fuel tank. This helps protect the fuel tank and prolong its service life.

[0077] 2. Reducing noise: The shock absorption of the strap can also reduce the noise generated by the fuel tank during driving. The shaking and vibration of the fuel tank can produce noise, affecting the quiet environment inside the car. The strap can reduce this noise and improve the comfort of the ride. Especially at high speeds, the shock absorption effect of the strap is particularly important in reducing noise.

[0078] III. Flexible adjustment of position

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

[0080] 2. Easy maintenance and replacement: If the fuel tank needs to be repaired or replaced, the strap binding method can easily disassemble the fuel tank. Simply loosen the straps and the fuel tank can be removed from the rear floor for repair or replacement. Compared to other fixing methods, strap-bound fuel tanks are easier to repair and replace, reducing maintenance costs and time.

[0081] IV. Low cost

[0082] 1. Low material cost: Straps are usually made of rubber, nylon or other synthetic materials, which are low in cost and easy to obtain. Compared to some expensive metal fixing parts or welding equipment, the cost of straps is much lower. For automobile manufacturers, using strap-bound fuel tanks can reduce production costs and improve product competitiveness.

[0083] 2. Low installation cost: As mentioned earlier, the installation method of the binding band is simple and fast, 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] Further, the bottom of the rear floor longitudinal beam on the left and right sides of the rear floor is pressed and positioned on the left and right sides of the oil tank.

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

[0086] The beneficial effects of the present application are: the rear floor designed in the present application realizes the universality of the electric car and the range extended car through the shared assembly structure, and the rear floor is selectively assembled on the battery pack cross beam or the oil tank cross beam through the connecting piece. The development cost is reduced, and the design work of the vehicle enterprise in the chassis part can be partially universal, without the need for completely independent chassis design for pure electric and range extended vehicles. The workload and design difficulty of the design team in the research and development process are reduced, thereby reducing the design cost. After the rear floor is shared, only one set of mold needs to be developed, or a small amount of modification and adjustment is made on the basis of the original mold, greatly reducing the development and manufacturing cost of the mold. On the production line, the shared rear floor can make the production process of pure electric and range extended vehicles more similar, reducing the complexity of the production line. Workers do not need to frequently switch production modes and operation processes, 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 the suspension system and shock absorber, can also be universal in pure electric and range extended vehicles. In this way, the vehicle enterprise can carry out batch procurement and production, reducing the procurement cost and inventory management cost of parts, and also facilitating the assembly and quality control of parts in the production process. The shared rear floor can help the vehicle enterprise better plan the in-vehicle space and avoid unreasonable space layout due to differences in different power systems. Since the rear floor structure does not need to be designed separately for different power systems, the vehicle enterprise can make full use of the trunk space and improve the storage capacity of the trunk, making it easier for users to store luggage and items. A reasonably designed shared rear floor can make the chassis structure more solid and improve the rigidity of the chassis. The improvement of the rigidity of the chassis is very important for the handling performance and driving stability of the vehicle, which can reduce the deformation and vibration of the vehicle during driving, making the driving more stable and the handling more accurate. Pure electric and range extended vehicles differ in the weight distribution of the power system, but through the shared rear floor, the vehicle enterprise can optimize and adjust the weight distribution of the chassis, making the center of gravity of the vehicle more reasonable and improving the driving performance and safety performance of the vehicle. For after-sales maintenance personnel, the shared rear floor of pure electric and range extended vehicles means that they can use similar techniques and methods during maintenance, without the need to master two different maintenance skills. This not only reduces the training cost of maintenance personnel, but also improves the maintenance efficiency and reduces the waiting time of users. The shared rear floor makes some parts of pure electric and range extended vehicles universal, making it easier to supply parts during after-sales maintenance. Maintenance personnel can more easily obtain the required parts, reducing maintenance delays due to a shortage of parts and improving user satisfaction. BRIEF DESCRIPTION OF DRAWINGS

[0087] Figure 1 isometric view of the rear floor in the present application in the prepared assembly position above the battery pack;

[0088] Figure 2Right view of the rear floor in the preparation assembly position above the battery pack in the application;

[0089] Figure 3 Top view of the rear floor in the assembly position above the battery pack in the application;

[0090] Figure 4 Top view of the rear floor in the assembly position above the battery pack in the application;

[0091] Figure 5 Perspective view of the relative arrangement position of the oil tank and the rear floor without the oil tank beam in the assembly in the application;

[0092] Figure 6 Perspective view of the relative arrangement position of the oil tank and the rear floor with the oil tank beam in the assembly in the application;

[0093] Figure 7 Front perspective view of the oil tank beam mounted on the rear floor in the application;

[0094] Figure 8 Vertical cross-sectional view of the binding belt and the oil tank beam fixed connection structure in the application;

[0095] Wherein, 1 is the rear floor longitudinal beam, 2 is the battery pack beam, 3 is the connecting piece, 4 is the oil tank beam, 5 is the mounting groove, 6 is the bolt through hole, 7 is the battery pack, 8 is the flange, 9 is the transition connecting piece, 10 is the oil tank, 11 is the beam seat support, 12 is the oil tank damping pad, 13 is the oil tank fixing bolt, 14 is the pull rivet nut, 15 is the binding belt. DETAILED DESCRIPTION

[0096] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments of the application. In the description of the application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0097] In some embodiments, as Figure 1The rear floor shown in Figure 8 is shared by the pure electric and range-extended vehicle models. The rear floor includes two rear floor longitudinal beams 1 on the left and right. The front end of the rear floor longitudinal beam 1 is fixedly connected to a connector 3, which is an integral structure for fixing to the battery pack crossbeam 2. The connector 3 is provided with a mounting groove 5 for positioning and installing the fuel tank crossbeam 4. The connector 3 is provided with a shared assembly structure for detachably fixing the connector 3 to the battery pack crossbeam 2 or to the fuel tank crossbeam 4.

[0098] Example 1

[0099] Based on the aforementioned rear floor, a preferred arrangement structure for the connector 3 is designed: one end of the connector 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 towards the inner side of the rear floor.

[0100] Example 2

[0101] Based on Embodiment 1, a preferred design structure for the connector 3 is designed: the connector 3 has an installation groove 5 for positioning and installing the end beam segment of the oil tank crossbeam 4. The connector 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 installation groove 5.

[0102] Example 3

[0103] Based on Embodiment 1 or 2, a preferred structure of a shared assembly structure is designed: the shared assembly structure includes multiple bolt through holes 6 opened on the front panel, top plate and rear panel of the connector 3.

[0104] Example 4

[0105] Based on embodiments one, two, or three, the connection between the connector 3 and the rear floor longitudinal beam 1 is further optimized: the bottom of the front end face of the rear floor longitudinal beam 1 is fixedly connected with a flange 8 that extends from the outer side of the rear floor longitudinal beam 1 to the inner side of the connector 3, for fixing to the surface of the battery pack 7 or to the rear part of the vehicle floor.

[0106] Based on the above-mentioned rear floor structure, a vehicle body mounting structure for the rear floor was designed, including a battery pack mounting structure for the rear floor and a fuel tank mounting structure for the rear floor.

[0107] In some embodiments, such as Figure 1 As shown in Figure 8, the battery pack mounting structure of the rear floor includes a battery pack 7 and a battery pack beam 2 fixed on the battery pack 7. The two ends of the battery pack beam 2 are detachably fixed to two connecting parts 3 through a bolt and nut structure and multiple bolt holes 6, respectively. The fuel tank mounting structure of the rear floor includes a fuel tank beam 4 and a fuel tank 10. The two ends of the fuel tank beam 4 are detachably fixed to two connecting parts 3 through a bolt and nut structure and multiple bolt holes 6, respectively.

[0108] Example five

[0109] Based on the rear floor body mounting structure described above, the connection structure between the battery pack cross beam 2 and the connecting piece 3 is optimized: as shown in Figure 1 Fig. 4, the two ends of the battery pack cross beam 2 are respectively connected with a transition connecting piece 9, the transition connecting piece 9 is detachably fixed on the bolt through hole 6 of the two connecting pieces 3 and the through hole (as shown in Figure 3 Fig. 5) of the battery pack cross beam 2 through the structure of bolt and nut, and the transition connecting piece 9 is a U-shaped bent plate structure.

[0110] Example six

[0111] Based on the rear floor structure described above, the mounting structure of the oil tank 10 is optimized: as shown in Figure 5 Fig. 8, the oil tank 10 is fixed on the rear floor and the oil tank cross beam 4 by binding with the binding belt 15, and 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.

[0112] In summary, the rear floor designed in the application realizes the universality of the pure electric vehicle and the range extended vehicle through the shared assembly structure, and the rear floor is selectively assembled on the battery pack cross beam 2 or the oil tank cross beam 4 through the connecting piece 3. The cross beam seat support 11 (as shown in Figure 4 and 7The rear floor can be used as a rear seat beam, reducing development costs, and the design work of the vehicle manufacturer in the chassis part can be partially common, without the need for completely independent chassis design for pure electric and extended range models. Reducing the workload and design difficulty of the design team during the research and development process, 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 needed based on the original mold, greatly reducing the development and manufacturing cost 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 operation processes, 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 the suspension system and shock absorber, can also be used in pure electric and extended range models. In this way, the vehicle manufacturer can purchase and produce in bulk, reducing the procurement cost and inventory management cost of parts, and also facilitating the assembly and quality control of parts during the production process. Sharing the rear floor can help the vehicle manufacturer better plan the interior space and avoid unreasonable space layout due to differences in different power systems. Since the rear floor structure does not need to be designed separately for different power systems, the vehicle manufacturer can make full use of the trunk space and improve the storage capacity of the trunk, making it easier for users to store luggage and items. A reasonably designed shared rear floor can make the chassis structure 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, which can reduce the deformation and vibration of the vehicle during driving, making the vehicle drive more smoothly and handle more accurately. Pure electric and extended range models differ in the weight distribution of the power system, but by sharing the rear floor, the vehicle manufacturer can optimize and adjust 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 techniques and methods during maintenance, without the need to master two different maintenance skills. This not only reduces the training cost of maintenance personnel, but also improves maintenance efficiency and reduces user waiting time for maintenance. Sharing the rear floor allows some parts of pure electric and extended range models to be used, making it easier to supply parts during after-sales maintenance. Maintenance personnel can more easily obtain the required parts, reducing maintenance delays due to a shortage of parts and improving user satisfaction.

[0113] Here, it should be noted that the above technical solution is exemplary, the present 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 present disclosure be thorough and complete, and will fully convey the scope disclosed by the present specification to those skilled in the art. In addition, the technical solution of the present application is only limited by the scope of the claims. In the case of using "including", "having" and "containing" described in the specification, there can also be another part or other part, the term used can be singular but can also represent plural.

[0114] Finally, it should be noted that the above embodiments are only more representative examples of the present application. Obviously, the present application is not limited to the above embodiments, but can also have many variations. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application should be considered as falling within the scope of protection of the present application.

Claims

1. A rear floor shared by a pure electric vehicle and a range-extended vehicle, comprising left and right rear floor longitudinal beams (1), characterized in that: The front end of the rear floor longitudinal beam (1) is fixedly connected with a connecting piece (3) which is an integral structure with the rear floor longitudinal beam (1) and is used for fixing with a battery pack cross beam (2); the connecting piece (3) is provided with an installation slot (5) used for positioning and installing an oil tank cross beam (4); the connecting piece (3) is provided with a shared assembly structure used for detachably fixing the connecting piece (3) with the battery pack cross beam (2) or detachably fixing the connecting piece (3) with the oil tank cross beam (4); one end of the connecting piece (3) is fixedly connected with the inner side surface of the front end of the rear floor longitudinal beam (1), and the other end extends to the inner side of the rear floor along the width direction of the rear floor; the connecting piece (3) is provided with the installation slot (5) used for positioning and installing an end beam section of the oil tank cross beam (4); the connecting piece (3) comprises a U-shaped bending plate structure with an open bottom, and the space surrounded by the U-shaped bending plate structure comprises the installation slot (5).

2. The rear floor common to the pure electric and extended-range vehicle according to claim 1, characterized by: The shared assembly structure comprises a plurality of bolt through holes (6) provided on the front panel, the top panel and the rear panel of the connecting piece (3).

3. The rear floor common to the pure electric and extended-range vehicle according to claim 1 or 2, characterized in that: The bottom of the front end surface of the rear floor longitudinal beam (1) is fixedly connected with a flange (8) which extends from the outer side of the rear floor longitudinal beam (1) to the inner side of the connecting piece (3) and is used for fixing with the surface of a battery pack (7) or fixing with the rear part of a middle floor of a vehicle body.

4. The body mounting structure of the rear floor common to the pure electric and extended-range vehicle according to any one of claims 1 to 3, characterized in that: It comprises a battery pack mounting structure of a rear floor and an oil tank mounting structure of the rear floor. The battery pack mounting structure of the rear floor comprises 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 on the shared assembly structures of two connecting pieces (3) respectively. The oil tank mounting 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 two connecting pieces (3) through two shared assembly structures respectively.

5. The body mounting structure of the rear floor common to the pure electric and extended-range vehicle according to claim 4, characterized in that: The two ends of the battery pack cross beam (2) are detachably fixed on the shared assembly structures of two connecting pieces (3) through a transition connecting piece (9) respectively.

6. The body mounting structure of the rear floor common to the pure electric and extended-range vehicle according to claim 4, characterized in that: The oil tank (10) is fixed on the rear floor and the oil tank cross beam (4) by being bound with a binding belt (15).

7. The body mounting structure of the rear floor common to the pure electric and extended-range vehicle according to claim 6, characterized in that: The left and right sides of the oil tank (10) are pressed and positioned with the bottoms of the rear floor longitudinal beams (1) on the left and right sides of the rear floor.

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