Tractor chassis and tractor

Abstract

This utility model discloses a tractor chassis and a tractor, relating to the field of vehicle technology. The tractor chassis includes: a frame; a battery frame disposed in the middle of the frame; the battery frame includes: two battery racks, each disposed on one side of the frame in the width direction, for housing a power battery; and a connecting frame connecting the two battery racks. The connecting frame and the battery racks together form an enclosing space, with at least a portion of the frame passing through this enclosing space. The battery racks and the connecting frame are respectively fixedly connected to the frame. The technical solution provided by this utility model reduces the chassis's weight and improves the overall structural strength of the chassis.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a tractor chassis and a tractor. Background Technology

[0002] In port logistics, new energy tractor vehicles are gradually being used. However, existing new energy tractor vehicles are 1-2 tons heavier than traditional energy vehicles, affecting their range. In terms of vehicle layout, the battery module is placed behind the cab and is higher than the rear window of the cab. This not only affects the rear-view auxiliary observation of the container semi-trailer by the operators in the cab, but also raises the center of gravity of the vehicle, which is not conducive to the vehicle's driving stability. Utility Model Content

[0003] The main purpose of this utility model is to provide a tractor chassis and tractor, which aims to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, this utility model proposes a tractor chassis, comprising: Frame; A battery frame, disposed in the middle of the vehicle frame, the battery frame comprising: Two battery racks are provided, and the two battery racks are respectively located on both sides of the width direction of the vehicle frame. The battery racks are used to hold power batteries. A connecting frame connects two battery racks, and the connecting frame and the battery rack together form an enclosing space. The vehicle frame is at least partially inserted into the enclosing space, and the battery rack and the connecting frame are respectively fixedly connected to the vehicle frame.

[0005] In one embodiment, the connecting frame includes: A top beam is located at the top of the vehicle frame and extends along the width direction of the vehicle frame; the top beam is fixedly connected to the top of the two battery racks. A bottom beam is located at the bottom of the vehicle frame and extends along the width direction of the vehicle frame. The bottom beam is fixedly connected to the bottom of the two battery racks. The battery rack, the top beam, and the bottom beam together form the enclosing space.

[0006] In one embodiment, the battery frame further includes a foot pedal laid on the top beam on the side opposite to the vehicle frame.

[0007] In one embodiment, the tractor chassis further includes: The rear axle is located at the rear of the vehicle frame; The drive assembly is located within the enclosed space and is connected to the rear axle drivetrain.

[0008] In one embodiment, the tractor chassis further includes: A first fixed bracket is disposed on one side of one of the battery racks facing the head of the vehicle frame. The first fixed bracket is used to install the battery and the boarding ladder. A second mounting bracket is provided on the side of the other battery rack facing the head of the vehicle frame. The second mounting bracket is used to install the auxiliary drive controller and the junction box. An opening is provided on one side of the second mounting bracket for the wiring harness to pass through and plug into the auxiliary drive controller and the junction box.

[0009] In one embodiment, the tractor chassis further includes a thermal management system, which is mounted on the vehicle frame. The power battery and the drive assembly are respectively connected to the thermal management system for heat exchange.

[0010] In one embodiment, the thermal management system includes a refrigeration circuit, a heating circuit, a battery cooling circuit, and an electric drive cooling circuit. The refrigeration circuit is used to cool the cab, the heating circuit is used to heat the cab, the refrigeration circuit and the heating circuit are respectively connected to the battery cooling circuit for heat exchange, and the electric drive cooling circuit is connected to the refrigeration circuit for heat exchange.

[0011] In one embodiment, the tractor chassis further includes an air pump and an air filter, the air pump and the air filter being disposed within the enclosed space and fixedly connected to the frame; and / or, The vehicle frame includes: A longitudinal beam extends along the length of the vehicle, and the battery frame is fixedly connected to the longitudinal beam; A crossbeam extends along the width of the vehicle and is fixedly connected to the longitudinal beam; A reinforcing plate is provided on the longitudinal beam and corresponds to the position of the battery frame; The wall thickness of the longitudinal beam is less than 8mm, and the wall thickness of the reinforcing plate superimposed on the longitudinal beam is greater than or equal to 8mm.

[0012] This utility model also proposes a tractor unit, including the tractor unit described above.

[0013] In one embodiment, the tractor unit further includes a single-row cab located at the head of the chassis.

[0014] In the technical solution of this utility model, the tractor chassis has two parts: a frame and a battery frame. The battery frame includes a battery rack and a connecting frame. Two battery racks are provided, with the two batteries located in the middle of the frame and respectively positioned on both sides of the frame's width direction. The two battery racks are connected by a connecting frame. The connecting frame and the battery rack together form a frame structure with an enclosing space. The frame passes through the enclosing space and is fixedly connected to the battery rack and the connecting frame. By placing the batteries on both sides of the frame's width direction, the vehicle's center of gravity is lowered while maintaining balance, improving vehicle driving stability. The battery racks do not obstruct the driver's view. In addition, the two battery racks are connected as a whole by the connecting frame to form a frame structure, which improves the overall structural strength of the battery frame. Furthermore, both the connecting frame and the battery rack are connected to the frame. Compared with traditional structures, this increases the number of connection points between the battery frame and the frame, and also improves the connection strength between the battery frame and the frame. While meeting the requirements for load-bearing capacity and strength, the material usage of this battery frame can be reduced, which helps to reduce the self-weight of the battery frame and thus improve the lightweight level of the tractor chassis. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a structural schematic diagram of the tractor chassis provided by this utility model; Figure 2 A schematic diagram of the battery frame in the tractor chassis provided by this utility model; Figure 3 A schematic diagram of the thermal management system in the chassis of the tractor provided by this utility model; Figure 4 This is a structural schematic diagram of the single-row driver's cab in the tractor provided by this utility model.

[0017] Explanation of icon numbers: 100. Chassis; 200. Battery frame; 210. Battery rack; 220. Connecting frame; 221. Top beam; 222. Bottom beam; 300. Steps; 400. Rear axle; 500. Drive assembly; 600. First fixed bracket; 700. Second fixed bracket; 810. Cooling circuit; 820. Heating circuit; 830. Battery cooling circuit; 840. Electric drive cooling circuit; 900. Single-row cab.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] This technical solution proposes a tractor chassis, including: Frame 100; A battery frame 200 is located in the middle of the vehicle frame 100, and the battery frame 200 includes: There are two battery racks 210, which are respectively located on both sides of the width direction of the frame 100. The battery racks 210 are used to hold power batteries. The connecting frame 220 connects two battery racks 210. The connecting frame 220 and the battery rack 210 together form an enclosing space. The vehicle frame 100 is at least partially inserted into the enclosing space. The battery rack 210 and the connecting frame 220 are respectively fixedly connected to the vehicle frame 100.

[0023] In the technical solution of this utility model, the tractor chassis has two parts: a frame 100 and a battery frame 200. The battery frame 200 includes a battery rack 210 and a connecting frame 220. Two battery racks 210 are provided, with the two batteries located in the middle of the frame 100 and respectively on both sides of the width direction of the frame 100. The connecting frame 220 connects the two battery racks 210. The connecting frame 220 and the battery racks 210 together form a frame structure with an enclosing space. The frame 100 passes through the enclosing space and is fixedly connected to the battery racks 210 and the connecting frame 220. By placing the batteries on both sides of the width direction of the frame 100, the vehicle height is reduced while ensuring the balance of the center of gravity. The lower center of gravity improves vehicle stability, and the battery rack 210 does not obstruct the driver's view. Furthermore, the two battery racks 210 are connected by a connecting frame 220 to form a single frame structure, which improves the overall structural strength of the battery frame 200. Both the connecting frame 220 and the battery rack 210 are connected to the vehicle frame 100. Compared to traditional structures, this increases the number of connection points between the battery frame 200 and the vehicle frame 100, and also improves the connection strength. While meeting load-bearing capacity and strength requirements, the battery frame 200 requires less material, which helps reduce its weight and thus improves the lightweighting of the tractor chassis.

[0024] Specifically, such as Figures 1 to 4As shown, in one embodiment of this utility model, the tractor chassis includes a frame 100, which serves as the main support component for mounting the cab, power unit, axles, and other vehicle components. Additionally, a battery frame 200 is mounted on the frame 100 to secure the power battery. The battery frame 200 is located in the middle region along the length of the frame 100. The battery frame 200 comprises two parts: a battery rack 210 and a connecting frame 220. Two battery racks 210 are provided, symmetrically arranged on both sides of the width of the frame 100. Each battery rack 210 is constructed from multiple beams joined together to form a cuboid frame structure, ensuring sufficient strength while reducing its weight. The battery rack 210 has multiple mounting positions for securing the power battery, which can be fixed to these positions using screws or other fasteners, ensuring that the power battery does not shift or shake during vehicle operation. The connecting frame 220 is laterally positioned between the two battery frames 210. The connecting frame 220 can also be a cuboid frame structure composed of multiple beams. The connecting frame 220 and the battery frame 210 can be fixedly connected by welding or bolting, thus forming an integral frame structure. The connecting frame 220 and the battery frame 210 together enclose a space, which is open along the length of the frame 100. The middle structure of the frame 100 can pass through this space. Both the connecting frame 220 and the battery frame 210 can abut against the outer peripheral wall of the frame 100 and be fixed together by welding and bolting. In this way, the battery frame 200, the frame 100, and the connecting frame 220 are connected in pairs. This connection method not only increases the structural strength of the battery frame 200 itself, but also increases the number of connection points between the battery frame 200 and the frame 100, improving the connection strength between the battery frame 200 and the frame 100. It also helps to improve the structural strength of the entire tractor chassis.

[0025] In the above-described solution, placing the batteries on both sides of the frame 100 in the width direction lowers the vehicle's center of gravity, improving driving stability. Furthermore, the battery racks 210 do not obstruct the driver's view, enhancing operational convenience and safety. In addition, the two battery racks 210 are connected as a single unit via a connecting frame 220. Both the connecting frame 220 and the battery racks 210 are connected to the frame 100, forming a unified frame structure. While meeting load-bearing capacity and strength requirements, this solution reduces material usage and the weight of the battery frame 200, contributing to a lighter tractor chassis.

[0026] like Figure 2One structural form of the connecting frame 220 is shown. In this embodiment, the connecting frame 220 includes a top beam 221 and a bottom beam 222. The top beam 221 is located at the top of the frame 100 and extends horizontally along the width direction of the frame 100. Its two ends are fixedly connected to the top of the two battery racks 210 by means of screwing or welding, ensuring the firmness and stability of the connection. The bottom beam 222 is located at the bottom of the frame 100 and also extends horizontally along the width direction of the frame 100. The two ends of the bottom beam 222 are fixedly connected to the bottom of the two battery racks 210. Both the top beam 221 and the bottom beam 222 can be hollow beam structures to reduce weight while ensuring strength. In this way, the top beam 221, the bottom beam 222, and the side walls of the two battery racks 210 together form the aforementioned enclosed space. The middle part of the frame 100 structure passes through this enclosed space and is fixedly connected to the top beam 221, the bottom beam 222, and the battery racks 210 by welding or screwing. In this design, the top beam 221 and the bottom beam 222 are fixedly connected to the top and bottom of the frame 100, respectively, forming a stable frame structure, which improves the overall structural strength and rigidity of the battery frame 200. In addition, multiple top beams 221 and bottom beams 222 can be provided to further improve the overall strength. Multiple top beams 221 and multiple bottom beams 222 can be spaced apart along the length of the frame 100 and connected at different positions of the battery frame 210 to improve the support effect at different positions of the battery frame 210.

[0027] like Figure 1 In one embodiment of this utility model, the battery frame 200 further includes a pedal 300, which is laid on the top beam 221 on the side opposite to the vehicle frame 100. Based on the above solution, the battery frame 200 further includes a pedal 300, which is laid on the top beam 221 on the side opposite to the vehicle frame 100 and can be fastened to the top beam 221 with bolts. The pedal 300 can have a flat structure with an anti-slip texture on its surface. By placing the pedal 300 on the top beam 221, the space in this location can be fully utilized, improving the compactness of the chassis structure. Furthermore, the top beam 221 can also be used to support the pedal 300, achieving structural reuse and further enhancing the overall structural strength of the battery frame 200, thus optimizing the spatial layout of the entire vehicle.

[0028] like Figure 1 In one embodiment of the present invention, the tractor chassis further includes: a rear axle 400, located at the rear of the frame 100; and a drive assembly 500, located within the enclosed space and connected to the rear axle 400 in a transmission manner.

[0029] In this design, the rear axle 400 is mounted at the rear of the frame 100. As an important component of the vehicle's driving system, the rear axle 400 serves to mount the wheels and bear various loads and torque transmissions during vehicle operation. The drive assembly 500 is arranged within the enclosed space formed by the battery rack 210, top beam 221, and bottom beam 222, and is connected to the rear axle 400 via a drive shaft. The drive assembly 500 mainly includes components such as a motor and a gearbox. To minimize weight, the drive assembly 500 in this design can adopt the configuration of a light truck, using a single motor and a 2-speed gearbox. In addition, placing the drive assembly 500 within the enclosure space allows for full utilization of the enclosure space formed by the battery frame 200, which helps reduce the space occupied in the length direction of the frame 100, shortens the vehicle's wheelbase, and gives the vehicle a smaller turning radius and reduces its weight. Furthermore, since the enclosure space is located in the middle of the frame 100, placing the drive assembly 500 in this position also helps optimize the vehicle's mass distribution, bringing the vehicle's center of gravity closer to the center of gravity of the frame 100 and enhancing the vehicle's driving stability.

[0030] like Figure 1 In one embodiment of this utility model, the tractor chassis further includes: A first fixed bracket 600 is provided on one side of one of the battery racks 210 facing the head of the frame 100. The first fixed bracket 600 is used to install the battery and the boarding ladder. The second mounting bracket 700 is located on the side of another battery rack 210 facing the head of the vehicle frame 100. The second mounting bracket 700 is used to install the auxiliary drive controller and the junction box. An opening is provided on one side of the second mounting bracket 700 for the wiring harness to pass through and be plugged into the auxiliary drive controller and the junction box.

[0031] In this embodiment, the tractor chassis also includes a first fixed bracket 600 and a second fixed bracket 700. The first fixed bracket 600 and the second fixed bracket 700 are cuboid frame structures spliced ​​from multiple beams. The first fixed bracket 600 is located on one side of one of the battery racks 210 facing the head of the frame 100. It can be tightly fixed to the battery rack 210 by bolts or welding. The battery can be fixed on the first fixed bracket 600. In addition, a loading ladder is provided above the battery. The loading ladder is also connected to the first fixed bracket 600, and the side of the loading ladder is fixedly connected to the battery rack 210. The battery provides power to the vehicle's auxiliary electrical system, while the loading ladder facilitates the entry and exit of the operator. The second mounting bracket 700 is located on the side of another battery rack 210 facing the head of the vehicle frame 100. Its structure is similar to that of the first mounting bracket 600. The second mounting bracket 700 has an internal cavity for installing the auxiliary drive controller and junction box. An opening is also provided on one side of the second mounting bracket 700, through which the wiring harness can be plugged into the auxiliary drive controller and junction box, facilitating the connection of the wiring harness. In the above scheme, the first mounting bracket 600 and the second mounting bracket 700 are respectively located on both sides of the battery rack 210 facing the head of the vehicle frame 100, making full use of the space on both sides of the vehicle frame 100, which also helps to shorten the wheelbase of the vehicle frame 100 and reduce the vehicle weight. Furthermore, since the battery, loading ladder, auxiliary drive controller, and junction box are distributed on both sides of the vehicle frame 100, the center of gravity of the vehicle is more evenly distributed, further improving the stability of the vehicle.

[0032] like Figure 3 In one embodiment of this utility model, the tractor chassis also includes a thermal management system, which is mounted on the frame 100. The power battery and drive assembly 500 are respectively connected to the thermal management system for heat exchange.

[0033] In this design, the tractor chassis further includes a thermal management system. The thermal management system is mounted on the frame 100 and is used to cool heat-generating components such as the battery and powertrain, and to exchange heat with the cab. The thermal management system can consist of a cooling device, a heating device, circulation pipes, a controller, and multiple temperature sensors, forming a closed-loop temperature regulation circuit. The power battery and drive assembly 500, as the main heat-generating components, are connected to the cooling device via circulation pipes. The heat from the power battery and drive assembly 500 can be dissipated through the cooling device. Similarly, in low-temperature environments, the heating device can heat the medium in the circulation pipes, thereby heating the power battery and drive assembly 500, ensuring that they maintain suitable operating temperatures. For the battery, this extends its service life and improves charging efficiency and discharging performance; for the drive assembly 500, it helps reduce wear on components, improves transmission efficiency, and reduces energy consumption.

[0034] like Figure 3 In one embodiment of this utility model, the thermal management system includes a cooling circuit 810, a heating circuit 820, a battery heat dissipation circuit 830, and an electric drive heat dissipation circuit 840. The cooling circuit 810 is used to cool the cab, the heating circuit 820 is used to heat the cab, the cooling circuit 810 and the heating circuit 820 are respectively connected to the battery heat dissipation circuit 830 for heat exchange, and the electric drive heat dissipation circuit 840 is connected to the cooling circuit 810 for heat exchange.

[0035] Specifically, the refrigeration circuit 810 primarily cools the cab. The refrigeration circuit 810 includes components such as a compressor, condenser, expansion tank, and evaporator. The compressor compresses the refrigerant into a high-temperature, high-pressure gas, which then flows into the condenser, where it dissipates heat to the external environment, transforming into a high-temperature, high-pressure liquid. After passing through the expansion valve and undergoing pressure reduction, the refrigerant becomes a low-temperature, low-pressure liquid and enters the evaporator. In the evaporator, the refrigerant absorbs heat from the cab, achieving a cooling effect. Finally, the refrigerant returns to the compressor to complete the cycle.

[0036] The heating circuit 820 is mainly used to heat the cab when the ambient temperature is low. The heating circuit 820 includes components such as a heater, a water pump, and a heater core. The heater uses heating elements such as a PTC to generate heat to heat water, and the water pump drives the hot water in the heater core to circulate, transferring heat to the cab.

[0037] The battery cooling circuit 830 focuses on cooling the power battery. It includes a battery cooling module, a water pump, and piping. Driven by the water pump, coolant flows through cooling channels between battery modules, absorbing heat generated by the battery. This heat is then dissipated through a heat exchanger. The electric drive cooling circuit 840 primarily addresses the cooling needs of the drive assembly 500. It includes a radiator, a water pump, and piping. The radiator is mounted at the front of the frame 100, utilizing airflow during driving for heat dissipation.

[0038] In the above structure, the cooling circuit 810 and the battery cooling circuit 830 are connected by a heat exchanger. When the battery temperature is high, the coolant in the battery cooling circuit 830 flows through the heat exchanger, transferring heat to the cooling circuit 810, thus reducing the battery temperature through the cooling capacity of the cooling circuit 810. Similar to the cooling circuit 810, the heating circuit 820 is also connected to the battery cooling circuit 830 by a heat exchanger. In cold environments, the heat from the heating circuit 820 can be transferred to the battery cooling circuit 830, heating the battery and ensuring it remains in normal operating condition. In this solution, the cooling circuit 810 can simultaneously cool the battery and the passenger compartment, and the heating circuit 820 can also simultaneously cool the battery and the passenger compartment. This effectively saves two sets of heat exchangers, helping to reduce system complexity and vehicle weight.

[0039] In one embodiment of this utility model, the tractor chassis also includes an air pump and an air filter, which are disposed within the enclosed space and fixedly connected to the frame 100. This arrangement can make full use of the space in the middle of the vehicle, avoiding the additional space occupied outside the frame 100 or other locations in the traditional layout, which helps to improve the compactness, shorten the overall wheelbase of the vehicle, and reduce the vehicle's weight.

[0040] In another embodiment, the frame 100 includes: longitudinal beams extending along the length of the vehicle, with the battery frame 200 fixedly connected to the longitudinal beams; crossbeams extending along the width of the vehicle and fixedly connected to the longitudinal beams; and reinforcing plates disposed on the longitudinal beams and corresponding to the positions of the battery frame 200. The wall thickness of the longitudinal beams is less than 8 mm, and the combined wall thickness of the reinforcing plates and longitudinal beams is greater than or equal to 8 mm. The longitudinal beams extend along the length of the vehicle, and the battery frame 200 is fixedly connected to the longitudinal beams. Two longitudinal beams may be provided, arranged parallel and spaced apart. The crossbeams extend along the width of the vehicle and are fixedly connected to the two longitudinal beams. The cooperation between the crossbeams and longitudinal beams enhances the overall rigidity of the frame 100; the reinforcing plates are disposed on the longitudinal beams and corresponding to the positions of the battery frame 200. The reinforcing plate adopts a structure that matches the shape of the longitudinal beam, and it can be fixed to the longitudinal beam by welding. Since the batteries in commercial vehicles are relatively heavy, placing a reinforcing plate at the battery frame location improves the load-bearing capacity of the frame 100 at the battery mounting position. Furthermore, because the frame 100 is locally reinforced, the overall wall thickness of the longitudinal beam can be reduced, even to below the requirements for bearing the battery. In this design, the wall thickness of the longitudinal beam is less than 8mm to reduce the weight of the frame 100, while the combined wall thickness of the reinforcing plate and longitudinal beam is greater than or equal to 8mm to ensure sufficient strength and rigidity of the frame 100 in the battery frame 200 mounting area. This structural design achieves a balance between lightweight and high strength for the frame 100.

[0041] This utility model also proposes a tractor vehicle, which includes a tractor vehicle chassis and a cab mounted on the tractor vehicle chassis. The cab can adopt a conventional structural design available on the market. The specific structure of the tractor vehicle chassis is as described in the above embodiments. Since this tractor vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0042] like Figure 4 In another embodiment of this utility model, the tractor also includes a single-row cab 900, which is located at the head of the frame 100. Compared with the existing extended cabs (i.e., cabs with a sleeper berth behind the seats) commonly used in port empty container tractors, the single-row cab 900 of this invention eliminates redundant configurations such as sleeper berths and sunroofs, which helps to shorten the wheelbase of the vehicle and reduce the overall weight.

[0043] The above are merely exemplary embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the technical concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A tractor chassis, characterized in that, include: Frame; A battery frame, disposed in the middle of the vehicle frame, the battery frame comprising: Two battery racks are provided, and the two battery racks are respectively located on both sides of the width direction of the vehicle frame. The battery racks are used to hold power batteries. A connecting frame connects two battery racks, and the connecting frame and the battery rack together form an enclosing space. The vehicle frame is at least partially inserted into the enclosing space, and the battery rack and the connecting frame are respectively fixedly connected to the vehicle frame.

2. The tractor chassis as described in claim 1, characterized in that, The connecting frame includes: A top beam is located at the top of the vehicle frame and extends along the width direction of the vehicle frame; the top beam is fixedly connected to the top of the two battery racks. A bottom beam is located at the bottom of the vehicle frame and extends along the width direction of the vehicle frame. The bottom beam is fixedly connected to the bottom of the two battery racks. The battery rack, the top beam, and the bottom beam together form the enclosing space.

3. The tractor chassis as described in claim 2, characterized in that, The battery frame also includes a pedal, which is laid on the top beam on the side opposite to the vehicle frame.

4. The tractor chassis as described in claim 3, characterized in that, The tractor chassis also includes: The rear axle is located at the rear of the vehicle frame; The drive assembly is located within the enclosed space and is connected to the rear axle drivetrain.

5. The tractor chassis as described in claim 1, characterized in that, The tractor chassis also includes: A first fixed bracket is disposed on one side of one of the battery racks facing the head of the vehicle frame. The first fixed bracket is used to install the battery and the boarding ladder. A second mounting bracket is provided on the side of the other battery rack facing the head of the vehicle frame. The second mounting bracket is used to install the auxiliary drive controller and the junction box. An opening is provided on one side of the second mounting bracket for the wiring harness to pass through and plug into the auxiliary drive controller and the junction box.

6. The tractor chassis as described in claim 4, characterized in that, The tractor chassis also includes a thermal management system, which is mounted on the vehicle frame. The power battery and the drive assembly are respectively connected to the thermal management system for heat exchange.

7. The tractor chassis as described in claim 6, characterized in that, The thermal management system includes a refrigeration circuit, a heating circuit, a battery cooling circuit, and an electric drive cooling circuit. The refrigeration circuit is used to cool the cab, the heating circuit is used to heat the cab, the refrigeration circuit and the heating circuit are respectively connected to the battery cooling circuit for heat exchange, and the electric drive cooling circuit is connected to the refrigeration circuit for heat exchange.

8. The tractor chassis as described in claim 1, characterized in that, The tractor chassis also includes an air pump and an air filter, wherein the air pump and the air filter are disposed within the enclosed space and are fixedly connected to the frame; and / or, The frame includes: A longitudinal beam extends along the length of the vehicle, and the battery frame is fixedly connected to the longitudinal beam; A crossbeam extends along the width of the vehicle and is fixedly connected to the longitudinal beam; A reinforcing plate is provided on the longitudinal beam and corresponds to the position of the battery frame; The wall thickness of the longitudinal beam is less than 8mm, and the wall thickness of the reinforcing plate superimposed on the longitudinal beam is greater than or equal to 8mm.

9. A tractor unit, characterized in that, Includes the tractor as described in any one of claims 1 to 8.

10. The tractor unit as described in claim 9, characterized in that, The tractor also includes a single-row cab, which is located at the head of the chassis.

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