Vehicle chassis structure and pure electric traction vehicle

Abstract

The utility model provides a vehicle chassis structure and a pure electric traction vehicle, and relates to the technical field of new energy automobiles, the vehicle chassis structure comprises a cabin accessory module, tires, a full bottom battery system, a frame and an electric drive axle; wherein the tire comprises a driven tire and a driving tire; the driven tire and the driving tire are fixedly arranged at the positions, corresponding to the driven shaft and the driving shaft, of the frame respectively, and the cabin accessory module is fixedly arranged in a first layout space on the frame; the electric drive axle is fixedly arranged in a third layout space on the frame, and the full bottom battery system is fixedly arranged in a second layout space on the frame. Therefore, the distribution of the vehicle chassis structure is optimized, the situation that the capacity improvement of the battery system is limited by the frame structure and weight constraint of the battery system is effectively avoided, and the cruising ability of the pure electric traction vehicle is effectively guaranteed to meet the long-distance transportation requirement as much as possible.

Description

Vehicle chassis structure and pure electric traction vehicle Technical Field

[0001] This application relates to the field of new energy vehicle technology, and in particular to a vehicle chassis structure and a pure electric traction vehicle. Background Technology

[0002] With the increasing global demand for low-carbon and environmentally friendly transportation, the application of pure electric tractor vehicles in the logistics and transportation sector is constantly expanding. Currently, most pure electric heavy-duty trucks on the market adopt a "rear-mounted" charging / swapping structure, with mainstream battery capacities of 282kWh, 350kWh, and 400kWh. This structural limitation restricts the driving range of pure electric heavy-duty trucks, limiting their application to short-distance, enclosed scenarios such as municipal sanitation (e.g., water trucks, landscaping maintenance vehicles, sweepers) and short-haul transportation (e.g., ports, steel mills, power plants, mines).

[0003] However, with the improvement of battery system energy density, the decrease in purchase cost, and the improvement of high-power charging pile layout, new energy heavy trucks are expanding towards medium and long distances and open scenarios. However, the battery frame of the existing "back-mounted" battery system is easily constrained by the "cantilever beam" structure and weight, which limits the increase of battery capacity and makes it difficult to meet the driving range needs of medium and long distance transportation. Summary of the Invention

[0004] The purpose of this application is to provide a vehicle chassis structure and a pure electric traction vehicle to solve the problem that the battery frame of the "back-mounted" battery system is easily constrained by the "cantilever beam" structure and weight, which limits the increase of the battery system's power capacity and makes it difficult to meet the driving range requirements for medium and long-distance transportation.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] In a first aspect, embodiments of this application provide a vehicle chassis structure, including: an engine compartment accessory module, tires, a fully under-mounted battery system, a frame, and an electric drive axle; wherein, the tires include: driven tires and driving tires;

[0007] The driven tire and the driving tire are respectively fixedly installed on the frame at corresponding positions of the driven shaft and the driving shaft, and the engine compartment accessory module is fixedly installed in the first layout space on the frame;

[0008] The electric drive axle is fixedly installed in the third layout space on the vehicle frame, and the fully bottom-mounted battery system is fixedly installed in the second layout space on the vehicle frame. The second layout space is the layout space between the first layout space and the third layout space on the vehicle frame.

[0009] Optionally, the fully bottom-mounted battery system includes: a battery frame, and multiple power battery modules placed within the battery frame.

[0010] Optionally, the battery frame includes: a first frame body, a second frame body, and a third frame body, wherein the first frame body and the third frame body are respectively fixedly connected to both sides of the second frame body; the second frame body is used to fix to the vehicle frame;

[0011] Both the first frame body and the third frame body are used to arrange at least two power battery modules that are arranged longitudinally along the preset extension direction of the vehicle frame.

[0012] Optionally, the second frame body includes: a plurality of horizontally arranged beam structures, one end of the plurality of beam structures being fixedly connected to the first frame body, and the other end of the plurality of beam structures being fixedly connected to the third frame body.

[0013] Optionally, the cabin accessory module includes: multi-layer brackets arranged vertically in the first layout space, and accessory units fixedly installed in each layer of brackets.

[0014] Optionally, the multi-layer bracket includes: a lower bracket close to the ground and an upper bracket away from the ground;

[0015] The accessory units fixedly installed on the lower bracket include: an electric steering pump, an electric air compressor, and a thermal management system. The accessory units fixedly installed on the upper bracket include: a control unit, a high-voltage power distribution module, a low-voltage power distribution module, a low-voltage battery module, and a battery management system.

[0016] Optionally, the electric drive bridge includes: a first electric drive bridge and a second electric drive bridge; the first electric drive bridge and the second electric drive bridge are respectively fixedly disposed in the subspaces corresponding to the two drive shafts in the third layout space.

[0017] Optionally, the vehicle chassis structure further includes an air reservoir, which is fixedly mounted on the frame at a preset position near the third layout space.

[0018] Optionally, the variable section point of the longitudinal beam on the frame is located between the third layout space and the second layout space;

[0019] The width between the two longitudinal beams corresponding to the second layout space is greater than the width between the two longitudinal beams corresponding to the third layout space.

[0020] Secondly, embodiments of this application provide a pure electric traction vehicle, which includes at least the vehicle chassis structure described in any of the first aspects above.

[0021] This application provides a vehicle chassis structure and a pure electric traction vehicle. The vehicle chassis structure can be composed of an engine compartment accessory module, tires, a fully undermount battery system, a frame, and an electric drive axle. The tires include driven tires and drive tires. The driven tires and drive tires are respectively fixedly mounted on the frame at corresponding positions on the driven and drive axles. The engine compartment accessory module is fixedly mounted in a first layout space on the frame, allowing for centralized arrangement of the engine compartment accessory modules, facilitating quick location and repair of frequently maintained components by maintenance personnel, and reducing maintenance costs and time. The electric drive axle is fixedly mounted in a third layout space on the frame, and the fully undermount battery system is fixedly mounted in a second layout space on the frame, thus placing the fully undermount battery system in the middle of the frame, optimizing the distribution of the vehicle chassis structure, and effectively avoiding the need for increasing the battery system capacity. The limitations imposed by the battery system's frame structure and weight constraints effectively ensure the range of the pure electric tractor vehicle, maximizing its ability to meet long-distance transportation needs. Secondly, it effectively utilizes the longitudinal space of the pure electric tractor vehicle chassis, avoiding the encroachment of the traditional "rear-mounted" battery system on the vehicle's superstructure space, thus improving the utilization rate of the superstructure and increasing the cargo box volume or installation space for operating equipment, thereby enhancing the transportation efficiency or operational capabilities of the pure electric tractor vehicle. Furthermore, since the fully undermounted battery system is fixedly installed in the second layout space on the frame, it effectively lowers the center of gravity of the pure electric tractor vehicle, improving its driving stability. In addition, the relatively independent layout of the engine compartment accessory module, tires, fully undermounted battery system, frame, and electric drive axle in the vehicle chassis structure of this application facilitates subsequent maintenance and repair. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 is a top view of a vehicle chassis structure provided in an embodiment of this application;

[0024] Figure 2 is a top view of a vehicle frame and a fully bottom-mounted battery system provided in an embodiment of this application.

[0025] Figure 3 is a schematic diagram of a fully bottom-mounted battery system provided in an embodiment of this application;

[0026] Figure 4 is a structural schematic diagram of a second frame body provided in an embodiment of this application;

[0027] Figure 5 is a schematic diagram of a bracket provided in an embodiment of this application;

[0028] Figure 6 is a schematic diagram of a bracket provided in an embodiment of this application;

[0029] Figure 7 is a schematic diagram of the installation structure of a gas storage cylinder according to an embodiment of this application;

[0030] Figure 8 is a structural schematic diagram of a vehicle frame provided in an embodiment of this application;

[0031] Figure 9 is a structural schematic diagram of a pure electric traction vehicle provided in an embodiment of this application. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] To better understand the various solutions provided in the embodiments of this application, the following detailed description of a vehicle chassis structure and a pure electric traction vehicle provided in the embodiments of this application will be provided in conjunction with the accompanying drawings.

[0040] Figure 1 is a top view of a vehicle chassis structure provided in an embodiment of this application. As shown in Figure 1, the vehicle chassis structure 100 may include: engine compartment accessory module 110, tires 120, a fully under-mounted battery system 130, a frame 140, and an electric drive axle 150.

[0041] The tire 120 may include a driven tire 121 and a driving tire 122.

[0042] The driven tire 121 and drive tire 122 are fixedly mounted on the frame 140 at corresponding positions on the driven axle and drive axle, respectively. The driven tire 121 provides support and assists in steering, while the drive tire 122 is powered by the electric drive axle 150 and is the direct power output component for the pure electric traction vehicle. The tire 120 is connected to the frame 140 via the suspension system to ensure the stability of the pure electric traction vehicle. Furthermore, as shown in Figure 1, with the combined action of the engine compartment accessory module 110 and the electric drive axle 150, the fully undermount battery system 130 is positioned between the driven tire 121 and drive tire 122, effectively improving the layout space of the battery system and addressing the issues of high vehicle center of gravity, low superstructure utilization, and safety hazards associated with pure electric traction vehicles.

[0043] The engine compartment accessory module 110 is fixedly installed in the first layout space on the frame 140; the engine compartment accessory module 110 can be used to realize functions such as power distribution, signal control and fluid transmission, and provide power and control support for the normal operation of pure electric traction vehicles.

[0044] The electric drive axle 150 is fixedly mounted in the third layout space on the chassis 140. The electric drive axle 150 is used to work in conjunction with the chassis 140, the under-mounted battery system 130 and the engine compartment accessory module 110 via mechanical connections and control lines.

[0045] The fully undermount battery system 130 is connected to the power distribution components in the engine compartment accessory module 110 and the electric drive axle 150 via a high-voltage wiring harness to achieve energy storage and release. This fully undermount battery system 130 is fixedly installed in the second layout space on the chassis 140 to fully utilize the space at the bottom of the chassis 140, increasing the battery system's capacity and improving the driving range of the pure electric traction vehicle. Furthermore, because the fully undermount battery system 130 is fixedly installed in the second layout space on the chassis 140, the center of gravity of the pure electric traction vehicle is lower, improving the overall driving stability. For example, taking the fully bottom-mounted battery system 130 and the traditional "back-mounted" battery system (such as a 4-layer back-mounted battery) as examples, the fully bottom-mounted battery system 130 provided in this application has a center of gravity reduction of ≥900mm and a vehicle center of gravity reduction of ≥350mm; taking the fully bottom-mounted battery system 130 and the traditional "back-mounted" battery system (such as a 6-layer back-mounted battery) as examples, the fully bottom-mounted battery system 130 provided in this application has a center of gravity reduction of ≥1200mm and a vehicle center of gravity reduction of ≥540mm; thus, the overall stability and handling of the pure electric traction vehicle are better. Furthermore, since the fully under-mounted battery system 130 is fixedly installed in the second layout space on the frame 140, the fully under-mounted battery system 130 provided in this application avoids obstructing the driver's rear window view compared with the traditional "rear-mounted" battery system, reducing driving safety hazards, and at the same time, it also minimizes the damage that the battery system may suffer in the event of a vehicle collision, effectively ensuring the safe operation of the pure electric traction vehicle.

[0046] The second layout space is the layout space between the first layout space and the third layout space on the frame 140. Specifically, the first layout space is located at the front of the vehicle near the driver's compartment; the second layout space is located in the middle of the vehicle chassis structure, that is, in the middle area of ​​the frame 140 between the driven tire 121 and the drive tire 122; and the third layout space is located near the rear of the vehicle.

[0047] The frame 140 serves as the core skeleton of the entire vehicle chassis structure, providing mounting foundations and support for components such as the engine compartment accessory module 110, tires 120, the fully under-mounted battery system 130, and the electric drive axle 150, to ensure that the pure electric traction vehicle maintains structural stability under heavy loads and complex road conditions.

[0048] For example, to facilitate understanding of the chassis 140 and the fully under-mounted battery system 130 provided in this application, Figure 2 is a top view schematic diagram of a chassis and a fully under-mounted battery system provided in an embodiment of this application. As shown in Figure 2, the fully under-mounted battery system 130 is disposed in the second layout space on the chassis 140, that is, the bottom space in the middle of the chassis 140, to optimize the weight distribution of the pure electric traction vehicle, increase the range of the pure electric traction vehicle, and is more efficient in space utilization, avoiding the encroachment of the traditional "rear-mounted" battery system layout on the upper body space of the pure electric traction vehicle. At the same time, the fully under-mounted battery system 130 and the chassis 140 work together to allow the fully under-mounted battery system 130 on the chassis 140 to be freely hoisted and disassembled, improving assembly processability and maintenance convenience.

[0049] This application provides a vehicle chassis structure, which can be composed of an engine compartment accessory module, tires, a fully undermount battery system, a frame, and an electric drive axle. The tires include driven tires and drive tires. The driven tires and drive tires are respectively fixedly mounted on the frame at corresponding positions on the driven and drive axles. The engine compartment accessory module is fixedly mounted in a first layout space on the frame, allowing for centralized arrangement of the engine compartment accessory module, facilitating quick location and repair of frequently maintained components by maintenance personnel, and reducing maintenance costs and time. The electric drive axle is fixedly mounted in a third layout space on the frame, and the fully undermount battery system is fixedly mounted in a second layout space on the frame, thus placing the fully undermount battery system in the middle of the frame, optimizing the distribution of the vehicle chassis structure, and effectively avoiding the impact of battery system capacity increases on the battery system's performance. The limitations imposed by the frame structure and weight constraints effectively ensure that the range of the pure electric tractor vehicle can meet the needs of long-distance transportation as much as possible. Secondly, it effectively utilizes the longitudinal space of the pure electric tractor vehicle chassis, avoiding the encroachment of the traditional "rear-mounted" battery system on the vehicle's superstructure space, thus improving the utilization rate of the superstructure and increasing the cargo box volume or installation space for operating equipment, thereby improving the transportation efficiency or operating capacity of the pure electric tractor vehicle. Furthermore, since the fully undermounted battery system is fixedly installed in the second layout space on the frame, it can effectively lower the center of gravity of the pure electric tractor vehicle and improve the driving stability of the vehicle. In addition, the relatively independent layout of each component in the vehicle chassis structure of this application, such as the engine compartment accessory module, tires, fully undermounted battery system, frame, and electric drive axle, facilitates subsequent maintenance and repair.

[0050] Figure 3 is a schematic diagram of a fully bottom-mounted battery system provided in an embodiment of this application. As shown in Figure 3, the fully bottom-mounted battery system 130 may include: a battery frame 131, and multiple power battery modules placed within the battery frame 131.

[0051] The battery frame 131 is designed to fit the vehicle chassis structure and accommodate multiple power battery modules. Each power battery module is typically composed of multiple individual battery cells connected in series and parallel to achieve the voltage and capacity required for a pure electric traction vehicle, thereby ensuring its driving range and meeting the medium- and long-distance transportation needs. Furthermore, each power battery module possesses excellent electrical insulation and heat dissipation performance to ensure safety and reliability during use.

[0052] It should be noted that the power battery modules in the battery frame 131 can all be hoisted individually, which makes it easy to operate on a single power battery module when it malfunctions and needs to be repaired or replaced, without having to disassemble the entire bottom-mounted battery system, greatly reducing maintenance costs and time.

[0053] This application provides a vehicle chassis structure in which a fully undermount battery system comprises a battery frame and multiple power battery modules placed within the battery frame. This design reduces the risk of damage to the fully undermount battery system in the event of a collision with an electric tractor vehicle. Because the fully undermount battery system is located at the bottom of the vehicle, it is protected to some extent by the frame and other chassis components, and the multiple power battery modules are protected by the battery frame, thus ensuring the safety of the fully undermount battery system. Furthermore, the fully undermount battery frame of this application fully utilizes the space at the bottom of the frame. Compared to the traditional "rear-mounted" battery system layout, this fully undermount battery frame does not occupy the superstructure space of the electric tractor vehicle, increasing the utilization rate of the superstructure and leaving more space for cargo transportation or the installation of operating equipment.

[0054] Referring to Figure 3, the battery frame 131 may include: a first frame body 131-1, a second frame body 131-2, and a third frame body 131-3.

[0055] The first frame body 131-1 and the third frame body 131-3 are respectively fixedly connected to both sides of the second frame body 131-2; that is, the second frame body 131-2 serves as the middle connecting part between the first frame body 131-1 and the third frame body 131-3, with both sides fixedly connected to the first frame body 131-1 and the third frame body 131-3 respectively. This structural design of the battery frame 131 forms a relatively stable overall frame.

[0056] The second frame body 131-2 is used to fix and connect with the frame 140, so as to install the battery frame 131 as a whole onto the frame 140 of the pure electric traction vehicle, thereby ensuring the stability of the battery frame 131 during the operation of the pure electric traction vehicle.

[0057] Both the first frame body 131-1 and the third frame body 131-3 are used to house at least two power battery modules arranged longitudinally along a preset extension direction of the frame 140. The preset extension direction can be selected according to actual conditions. That is, both the first frame body 131-1 and the third frame body 131-3 are used to house the power battery modules. These power battery modules are also arranged longitudinally along the preset extension direction of the frame 140 (such as the longitudinal direction of a pure electric traction vehicle). This longitudinal arrangement helps to fully utilize the space at the bottom of the frame and also facilitates the installation and maintenance of the power battery modules. Furthermore, since the power battery modules are arranged longitudinally on the frame bodies, and the first frame body 131-1 and the third frame body 131-3 are relatively independent, when a power battery module malfunctions and needs repair or replacement, it is relatively convenient to operate on the power battery module on that specific frame body. It is not necessary to disassemble the entire battery frame, reducing the difficulty and cost of maintenance.

[0058] It should be noted that, compared to traditional "back-mounted" battery systems where the battery frame is constrained by a "cantilever beam" structure and weight, limiting the battery's capacity and thus making it difficult to meet the needs of medium- and long-distance transportation, the first frame body 131-1 and the third frame body 131-3 of the battery frame 131 of this application are arranged entirely longitudinally to increase the battery's capacity. The second frame body 131-2 is distributed in a torsion-resistant full crossbeam configuration to ensure the stability of the battery frame 131 during pure electric traction vehicle operation. This allows the main body of the battery frame to be arranged in a "fully longitudinal" + "fully transverse" torsion-resistant crossbeam configuration. In this way, the battery frame 131 of the fully bottom-mounted battery system 130 of this application is no longer constrained by a "cantilever beam" structure and weight, thereby increasing the battery's capacity and thus increasing the driving range of the pure electric traction vehicle.

[0059] This application provides a vehicle chassis structure in which the battery frame is composed of a first frame body, a second frame body, and a third frame body. The first and third frame bodies are respectively fixedly connected to both sides of the second frame body. The second frame body is used to fix the battery frame to the vehicle frame, ensuring the secure installation of the battery frame on the pure electric traction vehicle. During acceleration, braking, and turning of the pure electric traction vehicle, the battery frame remains stable and will not loosen or shift. Both the first and second frame bodies are used to arrange at least two power battery modules arranged longitudinally along a predetermined extension direction of the vehicle frame, so that the longitudinal arrangement of the power battery modules on the first and second frame bodies can fully utilize the longitudinal space at the bottom of the vehicle frame. Compared with other battery system layouts, this fully longitudinal layout can increase battery capacity and improve the driving range of the pure electric traction vehicle without increasing its lateral width. Therefore, the connection structure of the first, second, and third frame bodies in this application gives the battery frame itself good structural stability. This robust frame structure can withstand the vibrations, bumps, and impacts generated during the operation of a pure electric tractor vehicle, protecting the internal power battery modules from damage and thus ensuring vehicle safety. Simultaneously, this battery frame layout, combined with the fully bottom-mounted battery system design, helps to further optimize the center of gravity distribution of the pure electric tractor vehicle. Arranging the power battery modules longitudinally at the bottom of the frame lowers the center of gravity of the pure electric tractor vehicle, improving its driving stability and handling performance, and reducing body roll during operation.

[0060] Figure 4 is a schematic diagram of the structure of a second frame body provided in an embodiment of this application. As shown in Figure 4, the second frame body 131-2 may include a plurality of horizontally arranged crossbeam structures 132. One end of each crossbeam structure 132 is fixedly connected to a first frame body 131-1, and the other end is fixedly connected to a third frame body 131-3. The bottom of the horizontally arranged crossbeam structures 132 is fixedly connected to the vehicle frame, thereby mounting the battery frame 131 onto the frame 140 of the pure electric traction vehicle and ensuring the stability of the battery frame 131 during the operation of the pure electric traction vehicle.

[0061] This application provides a vehicle chassis structure in which the second frame body can be composed of multiple horizontally arranged crossbeam structures. One end of each crossbeam structure is fixedly connected to the first frame body, and the other end is fixedly connected to the third frame body. Thus, this application can firmly connect the first and third frame bodies through the multiple crossbeam structures. The crossbeam structures can effectively distribute the stress generated during the operation of the pure electric traction vehicle, preventing deformation or damage to the battery frame. Simultaneously, the horizontally arranged crossbeam structures can effectively resist the forces and torques generated in different directions during cornering, acceleration, or braking of the pure electric traction vehicle, maintaining the shape and positional stability of the battery frame, thereby protecting the internal power battery module. Furthermore, by ensuring the stability of the fully under-mounted battery system, the driving stability of the pure electric traction vehicle is indirectly guaranteed.

[0062] Optionally, the aforementioned cabin accessory module 110 may include: multi-layer brackets arranged vertically in the first layout space, and accessory units fixedly disposed in each layer of brackets.

[0063] In one possible implementation, a bracket 111 is provided, as shown in Figure 5, which is a schematic diagram of the structure of a bracket provided in an embodiment of this application.

[0064] It should be noted that Figure 5 is only a schematic diagram of one layer of bracket 111 in the first layout space. The structures of other layers of bracket 111 are similar, so they will not be described in detail. In addition, it should be noted that there is no connection between each layer of bracket in the multi-layer bracket.

[0065] Each layer of the multi-layer bracket is fixedly connected to the frame 140, providing a stable mounting base for the accessory units. The accessory units, fixedly installed in each layer of the bracket, can be precisely installed on the corresponding multi-layer bracket according to their functional characteristics and usage frequency, so as to facilitate quick maintenance and reasonable allocation.

[0066] This application provides a vehicle chassis structure in which the engine compartment accessory module can be composed of multi-layer brackets vertically arranged in a first layout space, and accessory units fixedly installed in each layer of brackets. Thus, the multi-layer bracket design in this application allows accessory units to be arranged according to functional zones, enabling maintenance personnel to directly locate target components without complex disassembly and assembly processes. Furthermore, fixing the accessory units in each layer of brackets allows for the integration of more accessory units in the first layout space of the vehicle chassis structure. Compared to a planar layout, this saves space in the first layout, reserving more space for piping and wiring harnesses at the front of the frame and avoiding component interference.

[0067] Optionally, Figure 6 is a second structural schematic diagram of a bracket provided in an embodiment of this application. As shown in Figure 6, the multi-layer bracket may include: a lower bracket 111-1 close to the ground and an upper bracket 111-2 away from the ground.

[0068] The upper bracket 111-2 is bolted to the top crossbeam of the frame 140, and the lower bracket 111-1 is firmly fixed to the longitudinal beam of the frame 140 through a reinforcing bracket, ensuring structural stability under vibration and bumpy conditions of pure electric traction vehicles.

[0069] The accessory units fixedly mounted on the lower bracket 111-1 may include: an electric power steering pump, an electric air compressor, a thermal management system, and an air pump, among which the electric power steering pump is a type of oil pump. The accessory units fixedly mounted on the upper bracket 111-2 may include: a control unit, a high-voltage power distribution module, a low-voltage power distribution module, a low-voltage battery module, and a battery management system. The control unit can be selected according to actual needs; for example, it can be a multi-functional control unit. The low-voltage battery module is a low-voltage storage battery module.

[0070] It should be noted that, in this application, the accessory units placed on the upper bracket 111-2 and the lower bracket 111-1 can be flexibly selected according to the actual situation. This application only shows one possible implementation and should not be construed as a limitation of this application.

[0071] This application provides a vehicle chassis structure in which a multi-layer bracket can be composed of a lower bracket close to the ground and an upper bracket away from the ground. The accessory units fixedly mounted on the lower bracket may include: an electric power steering pump, an electric air compressor, and a thermal management system. The accessory units fixedly mounted on the upper bracket may include: a control unit, a high-voltage power distribution module, a low-voltage power distribution module, a low-voltage battery module, and a battery management system. Therefore, this application places high-frequency maintenance precision components such as the control unit and battery management system on the upper layer, allowing maintenance personnel to quickly disassemble and repair them without bending over or using auxiliary tools. Compared to traditional mixed layouts, this shortens the time per maintenance session and improves after-sales response efficiency. Furthermore, the layered design achieves functional zoning within the limited engine compartment space, saving lateral space compared to a flat layout and reserving more space for piping and wiring harnesses at the front of the chassis, avoiding component interference. The lower layer supports heavy components such as the electric power steering pump, fully utilizing the high load-bearing capacity of the chassis bottom, while the upper layer houses lightweight precision components, lowering the overall center of gravity of the engine compartment accessory modules and further optimizing the vehicle's center of gravity distribution in conjunction with the fully undermount battery system.

[0072] Referring again to Figure 1, the electric drive bridge 150 may include: a first electric drive bridge 151 and a second electric drive bridge 152.

[0073] The first electric drive axle 151 and the second electric drive axle 152 are respectively fixedly installed in the sub-spaces corresponding to the two drive shafts within the third layout space, so that the third layout space exists in a dual electric drive axle configuration, namely the first electric drive axle 151 and the second electric drive axle 152. The first electric drive axle 151 and the second electric drive axle 152 are precisely installed and fixed to the independent sub-spaces occupied by the two drive shafts on the frame. Each electric drive axle integrates key components such as a motor, reducer, and differential, and is rigidly connected to the frame through high-strength bolts, locating pins, and other connecting parts to ensure the stability and reliability of power transmission. This layout achieves a dual-redundancy design for the power system; the two electric drive axles can work independently or collaboratively, and the driving torque can be flexibly distributed through the control unit of the pure electric traction vehicle.

[0074] This application provides a vehicle chassis structure in which the electric drive axle can be composed of a first electric drive axle and a second electric drive axle. The first and second electric drive axles are respectively fixedly installed in the sub-spaces corresponding to the two drive shafts within a third layout space. Therefore, this application enables the pure electric traction vehicle to have stronger driving force and reliability through the first and second electric drive axles. Furthermore, the first and second electric drive axles can independently adjust their output torque, achieving torque vector control through the control unit of the pure electric traction vehicle. During cornering, the control unit automatically distributes different torques to the two drive shafts, reducing the speed of the inner wheels and increasing the speed of the outer wheels, thereby reducing the turning radius of the pure electric traction vehicle and improving handling agility. Simultaneously, since the first and second electric drive axles are independently installed in different sub-spaces, faulty electric drive axles can be disassembled and repaired individually during maintenance, without needing to disassemble the entire powertrain, reducing maintenance workload and time costs.

[0075] Referring again to Figure 1. As shown in Figure 1, the vehicle chassis structure 100 may also include: an air reservoir 160.

[0076] The air reservoir 160 is fixedly mounted on the frame 140 at a predetermined position near the third layout space. This predetermined position of the third layout space can be selected according to actual conditions; for example, the air reservoir 160 can be positioned between the first electric drive axle 151 and the second electric drive axle 152 within the third layout space. The air reservoir 160 is used to connect to the braking components on the pure electric traction vehicle, so that the compressed air stored in the air reservoir 160, generated by the air compressor, is released during braking of the pure electric traction vehicle, providing power to components such as the brake chamber, thereby enabling the pure electric traction vehicle to decelerate and stop.

[0077] It should be noted that the gas storage cylinder 160 can be installed on the gas storage cylinder bracket using clamps, and the gas storage cylinder bracket is installed on the crossbeam using bolts. As shown in Figure 7, Figure 7 is a structural schematic diagram of a gas storage cylinder installation provided in an embodiment of this application.

[0078] This application provides a vehicle chassis structure, which may also consist of an air reservoir fixedly mounted on the frame at a predetermined position near the third layout space. Therefore, this application shortens the pipeline length between the air reservoir and the electric drive axle, reduces the number of pipeline bends, makes the vehicle chassis structure more compact, reduces the risk of air leakage due to excessively long or complex pipeline layouts, thereby improving braking timeliness and reliability, and ensuring driving safety.

[0079] Figure 8 is a structural schematic diagram of a vehicle frame provided in an embodiment of this application. As shown in Figure 8, the cross-sectional point of the longitudinal beam on the above-mentioned vehicle frame 140 (the position in the red box in Figure 8(2)) is located between the third layout space and the second layout space; the cross-sectional point of the longitudinal beam indicated by the red box in Figure 8(1) is the vehicle frame 140 of the prior art. It can be clearly seen that the cross-sectional point of the longitudinal beam on the vehicle frame 140 of this application (the position in the red box in Figure 8(2)) is, compared with the cross-sectional point of the longitudinal beam on the vehicle frame 140 of the prior art (the position in the red box in Figure 8(1)), moved from the front end of the fully bottom-mounted battery system 130 to the rear end of the fully bottom-mounted battery system 130, thereby increasing the lifting gap between the battery system and the longitudinal beam of the vehicle frame 140, which is convenient for subsequent installation and maintenance.

[0080] The fully bottom-mounted battery system 130 is fixedly installed in the second layout space on the frame 140, while the electric drive axle 150 is fixedly installed in the third layout space on the frame 140. Since the width between the two longitudinal beams corresponding to the second layout space is greater than the width between the two longitudinal beams corresponding to the third layout space, the wider longitudinal beam spacing provides ample installation space for the fully bottom-mounted battery system 130. The narrower longitudinal beam spacing in the third layout space accommodates the layout requirements of the electric drive axle 150, ensuring the battery frame 131 is securely installed while making efficient use of the space at the bottom of the frame. A transition structure at the variable section point achieves a smooth change in the width of the longitudinal beams, ensuring the overall strength and rigidity of the frame.

[0081] It should be noted that the longitudinal beam of the frame 140 (the position in the red box in Figure 8(2)) is in the shape of a “Z”.

[0082] This application provides a vehicle chassis structure in which the cross-section point of the longitudinal beams on the frame is located between the third layout space and the second layout space; the width between the two longitudinal beams corresponding to the second layout space is greater than the width between the two longitudinal beams corresponding to the third layout space. Therefore, this application allows for precise configuration of the installation space, enabling the fully bottom-mounted battery system in the second layout space and the electric drive axle in the third layout space to support modular, independent installation, thereby optimizing the center of gravity distribution of the pure electric traction vehicle.

[0083] Figure 9 is a structural schematic diagram of a pure electric traction vehicle provided in an embodiment of this application. As shown in Figure 9, the pure electric traction vehicle 200 may include: a vehicle chassis structure 100.

[0084] Among them, the pure electric traction vehicle 200 can be equipped with a vehicle chassis structure 100, which provides a stable load-bearing and support platform for various components such as the body, battery system, motor, and electric drive axle, ensuring that the pure electric traction vehicle maintains a stable posture during driving and avoiding shaking or damage caused by unstable component installation.

[0085] The pure electric traction vehicle provided in this application may include a vehicle chassis structure. Therefore, compared with vehicles in the prior art, the pure electric traction vehicle provided in this application can maintain good handling and stability during operation, reduce side tilt, bumps, and deviation, and improve driving safety.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A vehicle chassis structure, characterized in that, include: The vehicle includes an engine compartment accessory module, tires, a fully undermount battery system, a chassis, and an electric drive axle. The tires include driven tires and drive tires. The driven tires and drive tires are respectively fixedly mounted on the chassis at corresponding positions on the driven and drive shafts. The engine compartment accessory module is fixedly mounted within a first layout space on the chassis. The electric drive axle is fixedly mounted within a third layout space on the chassis. The fully undermount battery system is fixedly mounted within a second layout space on the chassis, where the second layout space is the space between the first and third layout spaces on the chassis.

2. The vehicle chassis structure according to claim 1, characterized in that, The fully bottom-mounted battery system includes: a battery frame, and multiple power battery modules placed within the battery frame.

3. The vehicle chassis structure according to claim 2, characterized in that, The battery frame includes: a first frame body, a second frame body, and a third frame body. The first frame body and the third frame body are respectively fixedly connected to both sides of the second frame body. The second frame body is used to fix to the vehicle frame. The first frame body and the third frame body are both used to arrange at least two power battery modules arranged longitudinally along a preset extension direction of the vehicle frame.

4. The vehicle chassis structure according to claim 3, characterized in that, The second frame body includes: a plurality of horizontally arranged crossbeam structures, one end of which is fixedly connected to the first frame body, and the other end of which is fixedly connected to the third frame body.

5. The vehicle chassis structure according to claim 1, characterized in that, The cabin accessory module includes: multi-layer brackets arranged vertically in the first layout space, and accessory units fixedly installed in each layer of brackets.

6. The vehicle chassis structure according to claim 5, characterized in that, The multi-layer bracket includes a lower bracket close to the ground and an upper bracket away from the ground; wherein, the accessory units fixedly installed on the lower bracket include an electric steering pump, an electric air compressor, and a thermal management system, and the accessory units fixedly installed on the upper bracket include a control unit, a high-voltage power distribution module, a low-voltage power distribution module, a low-voltage battery module, and a battery management system.

7. The vehicle chassis structure according to claim 1, characterized in that, The electric drive bridge includes: a first electric drive bridge and a second electric drive bridge; the first electric drive bridge and the second electric drive bridge are respectively fixedly disposed in the subspaces corresponding to the two drive shafts in the third layout space.

8. The vehicle chassis structure according to claim 1, characterized in that, The vehicle chassis structure also includes an air reservoir, which is fixedly installed on the frame at a preset position near the third layout space.

9. The vehicle chassis structure according to claim 1, characterized in that, The variable section point of the longitudinal beam on the frame is located between the third layout space and the second layout space; the width between the two longitudinal beams corresponding to the second layout space is greater than the width between the two longitudinal beams corresponding to the third layout space.

10. A pure electric traction vehicle, characterized in that, At least including: The vehicle chassis structure according to any one of claims 1 to 9 above.

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