Universal integrated die-casting rear floor, mounting structure and mounting method

Abstract

The invention discloses a universal integrated die-casting rear floor, a mounting structure and a mounting method. The universal integrated die-casting rear floor comprises a rear floor body formed through integrated die-casting, a first cross beam and a second cross beam, wherein the first cross beam and the second cross beam are detachably fixed to the bottom of the rear floor body and arranged in parallel in the front-back direction of the rear floor body at intervals. The left side and the right side of the rear floor body are each provided with a rear floor assembly structure used for being detachably fixed to a vehicle body doorsill beam. The first cross beam has various structural sizes with the same length and different heights, and can adapt to new energy automobiles with various different driving forms. Through the innovative design of main body generalization and cross beam modularization, an integrated die-casting solution of one set of die and multi-vehicle adaptation is constructed, the core bottleneck of the traditional technology in platform compatibility and cost control is broken, and the cost control is more convenient and fast through high expansibility, high reusability and high reliability. And a key technical support is provided for transformation of new energy automobile body manufacturing to'standardization, flexibility and intelligence '.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive structure design and manufacturing, and specifically refers to a general integrated die-cast rear floor, an installation structure and an installation method. Background Art

[0002] The integrated die-casting technology has become the core technical direction of new energy vehicle body manufacturing due to its significant advantages such as process simplification, production efficiency improvement, vehicle weight reduction and structural stiffness optimization.

[0003] However, the large-scale application of current technologies faces the following common bottlenecks:

[0004] Insufficient platform versatility: Existing integrated die-cast structures are usually developed for a single vehicle model and are difficult to accommodate the vehicle model requirements with different wheelbases (such as compact / medium-sized vehicles), different power forms (pure electric / plug-in hybrid), and different battery layouts (CTP structure / CTC structure).

[0005] High engineering design complexity: To meet the requirements of multiple vehicle models, the host factory needs to develop multiple sets of independent molds, resulting in increased mold development costs and extended debugging cycles.

[0006] Low part reuse rate: Reusable parts in traditional split structures (such as suspension mounts and battery brackets) are forced to be customized in the integrated die-cast structure due to integrated design, resulting in insufficient part commonality.

[0007] In summary, there is an urgent need for an expandable integrated die-cast rear floor structure that can achieve multi-vehicle platform versatility, enable the same set of structure to adapt to the requirements of multiple wheelbases, multiple power forms and multiple battery types, reduce the full-process cost, mold cost and improve production efficiency. Summary of the Invention

[0008] The purpose of the present invention is to solve the deficiencies of the above background art and provide a general integrated die-cast rear floor, an installation structure and an installation method that can adapt to multiple wheelbases, multiple power forms and multiple battery types.

[0009] To achieve this purpose, the general integrated die-cast rear floor designed by the present invention includes a rear floor main body formed by integrated die-casting, and a first cross beam and a second cross beam that are detachably fixed to the bottom of the rear floor main body and are arranged in parallel at intervals along the front-rear direction of the rear floor main body; rear floor assembly structures for detachably fixing to the body sill beams are respectively arranged on the left and right sides of the rear floor main body; the first cross beam has multiple structural dimensions with the same length but different heights, and can adapt to new energy vehicles with multiple different drive forms.

[0010] Furthermore, the rear floor main body includes a middle rear floor, two rear floor longitudinal beams respectively and fixedly connected to the left and right sides of the middle rear floor, two sill connecting beams respectively and fixedly connected to the front ends of the two rear floor longitudinal beams, and two shock towers respectively and fixedly connected above the two rear floor longitudinal beams.

[0011] Furthermore, the front end of the shock tower is lapped and fixed to the outer side of the sill connecting beam.

[0012] Furthermore, the rear floor assembly structure includes a plurality of Z-direction bolt through-holes and a plurality of Y-direction bolt through-holes spaced along the length direction of the sill connecting beam. The Z-direction bolt through-holes are arranged along the height direction of the rear floor main body, and the Y-direction bolt through-holes are arranged along the width direction of the rear floor main body.

[0013] Furthermore, the left and right ends of the first cross beam are respectively detachably fixed between the inner sides of the front ends of the two sill connecting beams, and the first cross beam is arranged along the width direction of the rear floor main body.

[0014] Furthermore, the left and right ends of the second cross beam are respectively detachably fixed between the inner sides of the rear ends of the two sill connecting beams, and the second cross beam is arranged along the width direction of the rear floor main body.

[0015] Furthermore, the second cross beam is located below the front part of the middle rear floor.

[0016] Furthermore, an installation structure of an integrally die-cast rear floor includes a pure electric vehicle rear floor installation structure and an extended-range vehicle rear floor installation structure. The pure electric vehicle rear floor installation structure includes a pure electric vehicle sill beam and a pure electric vehicle battery. The left and right sides of the rear floor main body are fixed to the pure electric vehicle sill beam through the rear floor assembly structure. Both the first cross beam and the second cross beam are fixed above the pure electric vehicle battery. The extended-range vehicle rear floor installation structure includes an extended-range vehicle sill beam, an extended-range vehicle battery and an extended-range vehicle fuel tank. The left and right sides of the rear floor main body are fixed to the extended-range vehicle sill beam through the rear floor assembly structure. The first cross beam is fixed above the extended-range vehicle battery. The second cross beam has no fixed relationship with the rear floor main body, the extended-range vehicle sill beam, the extended-range vehicle battery and the extended-range vehicle fuel tank.

[0017] Furthermore, an installation method for the installation structure of an integrated die-cast rear floor includes the installation method of the integrated die-cast rear floor of a pure electric vehicle and the installation method of the integrated die-cast rear floor of an extended-range vehicle; the installation method of the integrated die-cast rear floor of the pure electric vehicle includes: selecting a first crossbeam with appropriate structural dimensions and installing and fixing it on the rear floor main body, installing and fixing the second crossbeam on the rear floor main body, installing and fixing the left and right sides of the rear floor main body on the pure electric vehicle sill beams on the left and right sides of the pure electric vehicle through the rear floor assembly structure, and installing and fixing the pure electric vehicle battery on the first crossbeam and the second crossbeam; the installation method of the integrated die-cast rear floor of the extended-range vehicle includes: selecting a first crossbeam with appropriate structural dimensions and installing and fixing it on the rear floor main body, not installing the second crossbeam, installing and fixing the left and right sides of the rear floor main body on the extended-range vehicle sill beams on the left and right sides of the extended-range vehicle through the rear floor assembly structure, and installing and fixing the extended-range vehicle battery on the first crossbeam.

[0018] Furthermore, if it is necessary to achieve the universality and interchangeability of the installation of the integrated die-cast rear floor of pure electric vehicles and extended-range vehicles, then copy the rear floor main body, select a first crossbeam with appropriate structural dimensions and install it on the rear floor main body, selectively install or not install the second crossbeam, and install the integrated die-cast rear floor on a pure electric vehicle or an extended-range vehicle.

[0019] The beneficial effects of the present invention are as follows: Through the detachable crossbeam design and modular installation structure, the present invention breaks through the application bottleneck of traditional integrated die-casting technology, significantly improves the platform compatibility and manufacturing economy of the vehicle body structure, and its beneficial effects are specifically as follows:

[0020] Fully compatible with wheelbase / power form / battery type: Through the flexible combination of the detachable first crossbeam (with various height dimensions) and the second crossbeam, the same rear floor main body can be adapted to compact / medium-sized vehicles (the wheelbase difference is adjusted by the crossbeam installation position), pure electric / plug-in hybrid models (the height of the first crossbeam matches the battery / fuel tank layout), and CTP / CTC battery structures (the crossbeam installation position is compatible with different battery pack interfaces). For example: For pure electric models, install double crossbeams to fix the battery, and for extended-range models, only install the first crossbeam to avoid the fuel tank, without the need to re-develop the mold, realizing "one set of structure, shared by multiple vehicles".

[0021] The standardized interface design reduces the adaptation difficulty: The Z-direction / Y-direction bolt through-holes of the rear floor assembly structure support flexible docking with the sill beams of different vehicle models. Redundant bolt hole positions are reserved to be compatible with the body width tolerance, reducing the adaptation and debugging time.

[0022] Traditional solutions require developing independent molds for each vehicle model. Through the detachable crossbeam + universal main body structure design, the present invention only requires one set of main body molds + multiple sets of standardized crossbeam molds, effectively reducing the number of molds, significantly lowering the development cost, and greatly shortening the debugging cycle. The main body molds are shaped once, and only the crossbeam molds need to be debugged, effectively reducing the number of trial molds and increasing the reuse rate of components.

[0023] The main body of the rear floor integrates common structures such as shock-absorbing towers and sill connection beams. Interfaces such as suspension mounting seats and battery brackets are reused through the modular design of the crossbeam, avoiding the "customization waste" of traditional integrated die-casting. The proportion of common components increases significantly. Different vehicle models can be quickly produced on the same production line by replacing the crossbeam, meeting the market demand for the parallel operation of multiple platforms in new energy vehicles.

[0024] In summary, through the innovative design of "universal main body + modular crossbeam", the present invention constructs an integrated die-casting solution of "one set of molds, multiple vehicles adapted", which not only breaks through the core bottlenecks of traditional technologies in platform compatibility and cost control, but also provides key technical support for the transformation of new energy vehicle body manufacturing towards "standardization, flexibility, and intelligence" with high scalability, high reusability, and high reliability, possessing significant industrial upgrading value and market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a perspective view of the universal integrated die-cast rear floor in the present invention;

[0026] Figure 2 It is a perspective view of the universal integrated die-cast rear floor installed on the body sill beam in the present invention;

[0027] Figure 3 It is a perspective view of the structure where the rear floor sill connection beam is fixed to the body sill beam in the present invention;

[0028] Figure 4 It is a schematic structural view of the universal integrated die-cast rear floor assembled on an electric vehicle in the present invention;

[0029] Figure 5 It is a schematic structural view of the universal integrated die-cast rear floor equipped with the No. 2 crossbeam assembled on an extended-range vehicle in the present invention;

[0030] Figure 6 It is a schematic structural view of the universal integrated die-cast rear floor without the No. 2 crossbeam assembled on an extended-range vehicle in the present invention;

[0031] Figure 7 It is a bottom view of the CTC battery pack in the present invention;

[0032] Figure 8 It is a bottom view of the CTP battery pack in the present invention;

[0033] Among them, 1 is the middle rear floor, 2 is the left shock tower, 3 is the right shock tower, 4 is the left longitudinal beam of the rear floor, 5 is the right longitudinal beam of the rear floor, 6 is the left sill connecting beam of the rear floor, 7 is the right sill connecting beam of the rear floor, 8 is the first cross beam, 9 is the second cross beam, 10 is the main body of the rear floor, 11 is the pure electric vehicle sill beam, 12 is the pure electric vehicle battery, 13 is the range extender vehicle sill beam, 14 is the range extender vehicle battery, 15 is the range extender vehicle fuel tank, 16 is the sealing ring, 17 is the Y-direction fixing bolt, 18 is the Z-direction fixing bolt, and 19 is the battery fixing bolt. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying 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 the embodiments. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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 a limitation of the present invention.

[0035] As Figure 1 shown in -3, in some embodiments, the general integrated die-cast rear floor designed by the present invention includes a rear floor main body 10 formed by integrated die-casting and a first cross beam 8 and a second cross beam 9 that are detachably fixed to the bottom of the rear floor main body 10 and are arranged in parallel at intervals along the front-rear direction of the rear floor main body 10.

[0036] Embodiment 1

[0037] As Figure 1 shown, a specific embodiment of the rear floor main body 10 is provided:

[0038] The rear floor main body 10 includes a middle rear floor 1; a left longitudinal beam 4 and a right longitudinal beam 5 of the rear floor respectively fixedly connected to the left and right sides of the middle rear floor 1; a left sill connecting beam 6 and a right sill connecting beam 7 of the rear floor respectively fixedly connected to the front ends of the left longitudinal beam 4 and the right longitudinal beam 5 of the rear floor; and a left shock tower 2 and a right shock tower 3 respectively fixedly connected above the left longitudinal beam 4 and the right longitudinal beam 5 of the rear floor. The front ends of the left shock tower 2 and the right shock tower 3 are respectively lapped and fixed to the outer sides of the left sill connecting beam 6 and the right sill connecting beam 7 of the rear floor.

[0039] As Figure 2 and Figure 3As shown in the figure, rear floor left sill connecting beams 6 and rear floor right sill connecting beams 7 are respectively provided with rear floor assembly structures for detachably fixing to the left and right body sill beams, so as to adapt to the general connection between the rear floor and the body sill beams. Specifically, the rear floor assembly structure includes a plurality of Z-direction bolt through-holes and a plurality of Y-direction bolt through-holes spaced along the length directions of the rear floor left sill connecting beam 6 and the rear floor right sill connecting beam 7. The Z-direction bolt through-holes are arranged along the height direction of the rear floor main body, and the Y-direction bolt through-holes are arranged along the width direction of the rear floor main body.

[0040] Embodiment Two

[0041] As Figure 1 —5 shows a specific embodiment of detachably fixing the rear floor main body 10 to the first cross beam 8 and the second cross beam 9:

[0042] The first cross beam 8 has a variety of structural dimensions with the same length and different heights, and can adapt to new energy vehicles with a variety of different drive forms. Both the left and right ends of the first cross beam 8 are detachably fixed between the inner sides of the front ends of the rear floor left sill connecting beam 6 and the rear floor right sill connecting beam 7 through a plurality of Z-direction bolts and a plurality of X-direction bolts. The first cross beam 8 is arranged along the width direction of the rear floor main body 10.

[0043] Both the left and right ends of the second cross beam 9 are detachably fixed between the inner sides of the rear ends of the rear floor left sill connecting beam 6 and the rear floor right sill connecting beam 7 through a plurality of Z-direction bolts. The second cross beam 9 is also arranged along the width direction of the rear floor main body 10. The second cross beam 9 is located below the front part of the middle rear floor 1.

[0044] Embodiment Three

[0045] As Figure 1 —5 shows a specific embodiment of the installation structure of an integrally die-cast rear floor, including a pure electric vehicle rear floor installation structure and an extended-range vehicle rear floor installation structure.

[0046] As Figure 4 As shown in the figure, the pure electric vehicle rear floor installation structure includes a pure electric vehicle sill beam 11 and a pure electric vehicle battery 12. The rear floor left sill connecting beam 6 and the rear floor right sill connecting beam 7 of the rear floor main body 10 are respectively fixed to the pure electric vehicle sill beam 11 through a plurality of Z-direction bolts and a plurality of Y-direction bolts (the Z-direction bolts pass through the Z-direction bolt through-holes and are threadedly connected inside the pure electric vehicle sill beam 11, and the Y-direction bolts pass through the Y-direction bolt through-holes and are threadedly connected inside the pure electric vehicle sill beam 11). Both the first cross beam 8 and the second cross beam 9 are fixed above the pure electric vehicle battery 12, serving as a fixed foundation for the pure electric vehicle battery 12 to ensure the stability of the pure electric vehicle battery fixation.

[0047] As Figure 6As shown in the figure, the installation structure of the rear floor of the range extender vehicle includes the range extender vehicle sill beam 13, the range extender vehicle battery 14, and the range extender vehicle fuel tank 15. The left rear floor sill connecting beam 6 and the right rear floor sill connecting beam 7 of the rear floor main body 10 are respectively fixed to the range extender vehicle sill beam 13 through a plurality of Z-direction bolts and a plurality of Y-direction bolts (the Z-direction bolts pass through the Z-direction bolt through holes and are threadedly connected inside the range extender vehicle sill beam 13, and the Y-direction bolts pass through the Y-direction bolt through holes and are threadedly connected inside the range extender vehicle sill beam 13). The first cross beam 8 is fixed above the range extender vehicle battery 14 and serves as the fixing foundation for the range extender vehicle battery 4 to ensure the stable installation of the range extender vehicle battery 4. At this time, in order to ensure that there is no interference with the range extender vehicle fuel tank 15 and the fuel filling pipeline, the installation of the second cross beam 9 is cancelled, and the second cross beam 9 has no fixed relationship with the rear floor main body 10, the range extender vehicle sill beam 13, the range extender vehicle battery 14, and the range extender vehicle fuel tank 15 (if the second cross beam 9 is installed, the second cross beam 9 will affect the installation of the range extender vehicle fuel tank 15 and the fuel filling pipeline, as Figure 4 shown). In addition, since the first cross beam 8 is selected to adapt to the installation of the range extender vehicle battery 14, a model with a relatively high height is selected to meet the installation requirements.

[0048] Embodiment 4

[0049] As Figure 7 shown in FIG. -8, an installation structure of an integrated die-cast rear floor that can use different batteries is provided:

[0050] The mainstream lap joint structures between the battery and the vehicle body are two technical routes: the CTP battery pack ( Figure 8 shown) and the CTC battery pack ( Figure 7 shown). The CTC technology has a higher degree of integration and requires a more stringent fixed structure and vehicle body sealing form. As Figure 7 shown, a sealing ring 16 needs to be arranged on the installation and sealing surface of the CTC. Both the CTP and CTC are fixed to the vehicle body chassis and the first cross beam 8 (or simultaneously fixed to the second cross beam 9) through the battery fixing bolts 19. To adapt to the installation and fixation of different batteries, for the CTC battery pack, since the sealing ring 16 occupies the installation height, therefore, a detachable first cross beam 8 with a smaller height dimension can be selected to reduce the height occupied space of the rear floor. At this time, it can be ensured that the installation of the second cross beam 9 is not affected. For the CTP battery pack, since the structure of the sealing ring 16 is missing, it is equivalent to increasing the installation height of the battery pack. At this time, both the first cross beam 8 and the second cross beam 9 can be installed and fixed with the CTP battery pack without adjusting the first cross beam 8 and the second cross beam 9.

[0051] The adaptation relationships of the cross beam structures for die-casting and installation to the battery pack, pure electric vehicle, and range extender vehicle are shown in the following table:

[0052]

[0053]

[0054] Since the second crossbeam 9 does not need to be installed when adapting to the range extender vehicle, it has no connection with the CTC battery pack and the CTP battery pack, which is represented by "——".

[0055] Example Five

[0056] Provide an installation method for the installation structure of an integrated die-cast rear floor, including the installation method of the integrated die-cast rear floor of a pure electric vehicle and the installation method of the integrated die-cast rear floor of a range extender vehicle.

[0057] The installation method of the integrated die-cast rear floor of a pure electric vehicle includes: selecting a first crossbeam 8 with appropriate structural dimensions and installing and fixing it on the rear floor main body 10, installing and fixing the second crossbeam 9 on the rear floor main body 10, respectively fixing the left rear floor threshold connecting beam 6 and the right rear floor threshold connecting beam 7 of the rear floor main body 10 to the pure electric vehicle threshold beam 11 through a plurality of Z-direction bolts and a plurality of Y-direction bolts (the Z-direction bolts pass through the Z-direction bolt through-holes and are threadedly connected inside the pure electric vehicle threshold beam 11, and the Y-direction bolts pass through the Y-direction bolt through-holes and are threadedly connected inside the pure electric vehicle threshold beam 11), and installing and fixing the pure electric vehicle battery 12 on the first crossbeam 8 and the second crossbeam 9.

[0058] The installation method of the integrated die-cast rear floor of a range extender vehicle includes: selecting a first crossbeam 8 with appropriate structural dimensions and installing and fixing it on the rear floor main body 10, not installing the second crossbeam 9, respectively fixing the left rear floor threshold connecting beam 6 and the right rear floor threshold connecting beam 7 of the rear floor main body 10 to the range extender vehicle threshold beam 13 through a plurality of Z-direction bolts and a plurality of Y-direction bolts (the Z-direction bolts pass through the Z-direction bolt through-holes and are threadedly connected inside the range extender vehicle threshold beam 13, and the Y-direction bolts pass through the Y-direction bolt through-holes and are threadedly connected inside the range extender vehicle threshold beam 13), and installing and fixing the range extender vehicle battery 14 on the first crossbeam 8.

[0059] If it is necessary to achieve the generality and interchangeability of the installation of the integrated die-cast rear floor of a pure electric vehicle and a range extender vehicle, then copy the rear floor main body 10, select a first crossbeam 8 with appropriate structural dimensions and install it on the rear floor main body 10, selectively install or not install the second crossbeam 9, and install the integrated die-cast rear floor on a pure electric vehicle or a range extender vehicle.

[0060] In summary, the general integrated die-cast rear floor technical solution proposed by the present invention realizes the high adaptability of the rear floor of new energy vehicles between pure electric / range extender models and different battery technology routes through structural integration innovation and modular design, specifically as follows:

[0061] I. Integrated die-cast main body: The basis of high strength and standardization

[0062] The rear floor main body 10 is formed by an integrated die-casting process, constructing a three-dimensional load-bearing framework of "longitudinal beam + cross beam + shock tower". The middle rear floor 1, as the core load-bearing structure, forms a closed loop structure through the left and right longitudinal beams (left rear floor longitudinal beam 4 / right longitudinal beam 5) and the front sill connection beams (left sill connection beam 6 / right sill connection beam 7), significantly improving the torsional stiffness. The left shock tower 2 and the right shock tower 3 are directly die-cast above the longitudinal beam, and their front ends are overlapped and fixed with the outer side of the sill connection beam, forming a rigid mounting fulcrum for the suspension system. This integrated design of "shock tower - longitudinal beam - sill beam" reduces the number of welding points compared with the traditional splicing process, improves the vibration transmission efficiency, and at the same time reduces the weight by about.

[0063] The standardized assembly interface is the core advantage of the main structure. The Z-direction (height direction) and Y-direction (width direction) bolt through-holes distributed along the length direction on the sill connection beam form a connection system of "two-dimensional positioning + three-dimensional fastening": the Z-direction bolts achieve vertical positioning, and the Y-direction bolts eliminate the lateral clearance, ensuring the precise docking of the rear floor and the body sill beam. This interface design is compatible with the pure electric vehicle sill beam 11 and the range extender vehicle sill beam 13, and through the unified bolt specifications and installation spacing, the rapid switching and assembly of different vehicle chassis can be realized.

[0064] II. Cross beam modular system: The core component for dynamic adaptation

[0065] (I) Functional division of the double cross beams

[0066] The first cross beam 8: Spanning across the inner side of the front sill connection beam along the width direction, serving as the front support for the battery pack. Its innovation lies in the design of multiple height specifications (the length is unified, and the height has multiple grades), and by replacing cross beams with different heights, the installation space of the battery pack can be adjusted.

[0067] The second cross beam 9: Arranged under the front part of the middle rear floor, serving as the rear support for the battery pack. Its structural feature is a detachable design, fixed to the rear end of the sill connection beam through Z-direction bolts. In range extender models, due to the need to avoid the fuel tank 15 and the fuel pipeline, it can be directly removed to eliminate interference.

[0068] (II) Cross beam configuration logic guided by the drive form

[0069] For different vehicle models, the cross beam configuration follows the following rules: In pure electric vehicle models, the first cross beam 8 needs to be installed (the full height specifications can be selected according to the battery type), and the second cross beam 9 is installed synchronously. The double cross beams jointly support the CTP / CTC battery pack to ensure the structural stiffness; in range extender vehicle models, the first cross beam 8 needs to be installed to support the battery, and at the same time, the second cross beam 9 is removed to avoid the fuel system. This mode of "fixed basic structure + dynamic increase and decrease of cross beams" enables the same rear floor main body to quickly switch the chassis configuration of pure electric / range extender vehicle models by replacing the cross beam components, reducing the mold investment and improving the platform production efficiency.

[0070] Through the triple innovation of "integrated die-cast body + modular crossbeam + multi-interface adaptation", the present invention solves two major problems in the platform development of new energy vehicles:

[0071] 1. Cross-power type compatibility: By dynamically increasing or decreasing the crossbeam and adjusting its height, the chassis structure differences between pure electric / extended-range vehicles are eliminated;

[0072] 2. Battery technology iteration adaptation: The same rear floor can be compatible with two generations of battery technologies, CTP and CTC, extending the platform life cycle. Its core competitiveness lies in achieving "great compatibility" of the vehicle architecture through "minor innovations" in mechanical structures, providing a feasible path for vehicle manufacturers to reduce mold costs and improve production flexibility. It is especially suitable for vehicle manufacturers implementing the "same platform for gasoline and electric vehicles" strategy, and has significant engineering application value and market promotion potential.

[0073] Here, it should be noted that the description of the above technical solutions is exemplary. This specification can be embodied in different forms and should not be construed as limited to the technical solutions described 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 solutions of the present invention are only limited by the scope of the claims. When using the terms "including", "having", and "comprising" described in this specification, there may also be another part or other parts. The terms used can generally be singular but can also represent plural forms. It should be pointed out that although the terms "first", "second", "top", "bottom", "one side", "the other side", "one end", "the other end", etc. may appear and be used in this specification to describe various different components, these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another. For example, without departing from the scope of this specification, the first component can be called the second component, and similarly, the second component can be called the first component. In certain cases, the components at the top and bottom can also be swapped or converted with each other; the components at one end and the other end can have the same or different performances from each other.

[0074] Finally, it should be pointed out that the above embodiments are only relatively representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and there can be many variations. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A universal one-piece die-cast rear floor, characterized in that: It comprises a rear floor body (10) formed by integral die casting, and a first crossbeam (8) and a second crossbeam (9) which are detachably fixed to the bottom of the rear floor body (10) and are arranged in parallel and spaced apart along the front-rear direction of the rear floor body (10); The left and right sides of the rear floor main body (10) are respectively provided with rear floor assembly structures for detachably fixing to the door sill beam of the vehicle body; The first crossbeam (8) has a plurality of structural dimensions with the same length and different heights, and can be adapted to new energy vehicles with a plurality of different drive forms.

2. The universal one-piece die-cast rear floor as claimed in claim 1, characterized in that: The rear floor body (10) comprises a middle rear floor (1), two rear floor longitudinal beams respectively fixedly connected to the left and right sides of the middle rear floor (1), two door sill connecting beams respectively fixedly connected to the front ends of the two rear floor longitudinal beams, and two shock absorbing towers respectively fixedly connected to the tops of the two rear floor longitudinal beams.

3. The universal one-piece die-cast rear floor as claimed in claim 2, characterized in that: The front end of the shock-absorbing tower is overlapped and fixed to the outer side of the door sill connecting beam.

4. The universal one-piece die-cast rear floor as claimed in claim 2 or 3, characterized in that: The rear floor assembly structure includes a plurality of Z-direction bolt through holes and a plurality of Y-direction bolt through holes which are arranged at intervals along the length direction of the door sill connecting beam, wherein the Z-direction bolt through holes are arranged along the height direction of the rear floor body, and the Y-direction bolt through holes are arranged along the width direction of the rear floor body.

5. The universal one-piece die-cast rear floor as claimed in claim 2 or 3, characterized in that: The left and right ends of the first cross beam (8) are respectively detachably fixed between the inner sides of the front ends of the two door sill connecting beams, and the first cross beam (8) is arranged along the width direction of the rear floor body (10).

6. The universal one-piece die-cast rear floor as claimed in claim 2 or 3, characterized in that: The left and right ends of the second cross beam (9) are respectively detachably fixed between the inner sides of the rear ends of the two door sill connecting beams, and the second cross beam (9) is arranged along the width direction of the rear floor body (10).

7. The universal one-piece die-cast rear floor as claimed in claim 6, characterized in that: The second cross beam (9) is located below the front portion of the middle rear floor (1).

8. An installation structure for an integrated die-cast rear floor according to any one of claims 1 to 4, characterized in that: It comprises a rear floor mounting structure for a pure electric vehicle and a rear floor mounting structure for an extended-range vehicle; the rear floor mounting structure for the pure electric vehicle comprises a door sill beam (11) for the pure electric vehicle and a battery (12) for the pure electric vehicle, the left and right sides of the rear floor main body (10) are fixed to the door sill beam (11) for the pure electric vehicle through the rear floor mounting structure, and the first cross beam (8) and the second cross beam (9) are both fixed above the battery (12) for the pure electric vehicle; the rear floor mounting structure for the extended-range vehicle comprises a door sill beam for the extended-range vehicle (13), a range-extended vehicle battery (14) and a range-extended vehicle fuel tank (15), the left and right sides of the rear floor body (10) are fixed to the range-extended vehicle door sill beam (13) through the rear floor assembly structure, the first cross beam (8) is fixed above the range-extended vehicle battery (14), and the second cross beam (9) has no fixed relationship with the rear floor body (10), the range-extended vehicle door sill beam (13), the range-extended vehicle battery (14) and the range-extended vehicle fuel tank (15).

9. A method for installing the installation structure of the integrated die-cast rear floor according to claim 8, characterized in that: The invention comprises an integrated die-cast rear floor installation method for a pure electric vehicle and an integrated die-cast rear floor installation method for a range-extended vehicle; The method for installing an integrated die-cast rear floor of a pure electric vehicle comprises: selecting a first cross beam (8) with a suitable structural size and installing and fixing it on a rear floor body (10), installing and fixing a second cross beam (9) on the rear floor body (10), installing and fixing the left and right sides of the rear floor body (10) on pure electric vehicle door sill beams (11) on the left and right sides of the pure electric vehicle through a rear floor assembly structure, and installing and fixing a pure electric vehicle battery (12) on the first cross beam (8) and the second cross beam (9); The method for installing an integrated die-cast rear floor of a range-extended vehicle comprises: selecting a first crossbeam (8) with suitable structural dimensions to be installed and fixed on a rear floor body (10), not installing a second crossbeam (9), installing and fixing the left and right sides of the rear floor body (10) on the range-extended vehicle door sill beams (13) on the left and right sides of the range-extended vehicle through a rear floor assembly structure, and installing and fixing a range-extended vehicle battery (14) on the first crossbeam (8).

10. The method for installing the installation structure of the integrated die-cast rear floor as claimed in claim 9, characterized in that: If it is necessary to realize the universal and interchangeable installation of the one-piece die-cast rear floor of a pure electric vehicle and an extended-range vehicle, the rear floor body (10) is copied, a No. 1 crossbeam (8) with suitable structural dimensions is selected and installed on the rear floor body (10), and the No. 2 crossbeam (9) is selectively installed or not installed, and the one-piece die-cast rear floor is installed on the pure electric vehicle or the extended-range vehicle.

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