Frame assembly and pure electric off-highway dump truck

Abstract

The utility model discloses a kind of frame assembly and pure electric off-highway dump truck, belong to off-highway dump truck technical field.The frame assembly of the utility model includes left longitudinal beam, right longitudinal beam, left front end beam, right front end beam, a pair of front ring beam, a pair of battery pack support, round pipe beam, lifting pipe beam, middle axle strengthening beam and rear axle strengthening beam.The frame assembly of the utility model realizes strong bearing and layout rationality, can stably bear large-tonnage load.The pure electric off-highway dump truck of the utility model, relying on the frame assembly, overall performance compatibility is strong, bearing capacity is strong, power is sufficient, transportation efficiency is high, is suitable for complex working conditions such as steep slope, jolt etc. of mining area.

Description

Technical Field

[0001] This utility model relates to the technical field of off-highway dump trucks. More specifically, this utility model relates to a chassis assembly and a pure electric off-highway dump truck. Background Technology

[0002] With the expansion of mining operations and the growing trend towards green and energy-saving technologies, the traditional fuel-powered construction machinery industry is rapidly transitioning to new energy-driven models, creating a vast market potential for pure electric off-highway dump trucks. However, current technologies, driven by increasing vehicle load capacity and improved operating efficiency, reveal significant shortcomings in the main frame, a core load-bearing component, hindering overall vehicle performance improvement. Existing pure electric off-highway dump trucks primarily employ bolted main frames, which are ill-suited for heavy-duty transportation in mining areas, exhibiting insufficient load-bearing capacity, low safety, and poor stability and reliability – prominent issues indeed. The deficiencies in the main frame further restrict the performance of other vehicle systems: the frame must support the cargo box, battery, transmission system, body, and other structures; due to insufficient frame load-bearing capacity, the power system can only be equipped with a small-power single-drive motor, making it difficult to cope with steep slopes in mining areas; the hydraulic lifting system mostly uses a single-cylinder design, which, limited by the frame's support strength, results in poor stability during unloading and insufficient chassis reliability; the battery system, due to an unreasonable frame layout, is prone to loosening under frame vibration transmission, leading to weak vehicle power and low transportation efficiency. Therefore, the frame structure itself and the relationship between the various systems and the frame are problems that urgently need to be solved. Summary of the Invention

[0003] This utility model provides a chassis assembly that achieves strong load-bearing capacity and reasonable layout, and can stably withstand large tonnage loads.

[0004] This utility model provides a pure electric off-highway dump truck, which relies on the chassis assembly and has strong overall performance adaptability, strong load-bearing capacity, sufficient power, and high transportation efficiency. It is suitable for complex working conditions such as steep slopes and bumpy roads in mining areas.

[0005] To achieve these objectives and other advantages according to the present invention, a chassis assembly is provided, comprising: Left longitudinal beam (1201) and right longitudinal beam (1202); The left front beam (1204) and the right front beam (1205) are provided. The rear end of the left front beam (1204) is fixedly connected to the front end of the left longitudinal beam (1201), and the rear end of the right front beam (1205) is fixedly connected to the front end of the right longitudinal beam (1202). The front ends of the left front beam (1204) and the right front beam (1205) are fixedly connected to the front bumper (1206). The lower wing surfaces of the left front beam (1204) and the right front beam (1205) are respectively provided with a left front suspension longitudinal thrust support (1207) and a right front suspension longitudinal thrust support (1208). The left front beam (1204) and the right front beam (1205) are both box structures formed by splicing multi-directional bending plates. The upper surface of the box structure gradually slopes upward from front to back, and the front ends of the inner side plate and the outer side plate are bent outward. A pair of front ring beams (1203) are respectively fixedly installed at the connection between the left front beam (1204) and the left longitudinal beam (1201), and the right front beam (1205) and the right longitudinal beam (1202); A pair of battery pack supports (1219) are provided behind a pair of front ring beams (1203), and the pair of battery pack supports (1219) are respectively fixedly provided on the outer side of the left longitudinal beam (1201) and the right longitudinal beam (1202); A circular tube beam (1214) is disposed behind the pair of front ring beams (1203) and is fixedly connected to the inner surfaces of the left longitudinal beam (1201) and the right longitudinal beam (1202); The lifting tube beam (120) is located behind a pair of front ring beams (1203) and is fixedly connected to the lower flanges of the left longitudinal beam (1201) and the right longitudinal beam (1202); The middle bridge reinforcing beam (1221) is located behind the circular tube beam (1214) and the lifting tube beam (120), and is fixedly connected to the inner side of the left longitudinal beam (1201) and the right longitudinal beam (1202); The rear axle reinforcing beam (1222) is located behind the middle axle reinforcing beam (1221) and is fixedly connected to the inner surfaces of the left longitudinal beam (1201) and the right longitudinal beam (1202).

[0006] Preferably, a pair of lifting supports (1209) are provided on the outer side walls of the left longitudinal beam (1201) and the right longitudinal beam (1202) corresponding to the position of the lifting tube beam (120). The left longitudinal beam (1201) and the right longitudinal beam (1202) are respectively provided with a left support (1215) and a right support (1216) for the middle bridge suspension cylinder on the outer side wall corresponding to the middle bridge reinforcing beam (1221). The left longitudinal beam (1201) and the right longitudinal beam (1202) are respectively provided with a left support (1217) and a right support (1218) for the rear axle suspension cylinder on the outer side wall corresponding to the position of the rear axle reinforcing beam (1222). A transverse pusher (1210) is provided adjacent to the front of both the middle bridge reinforcing beam (1221) and the rear bridge reinforcing beam (1222), and the transverse pusher (1210) is fixedly connected to the inner side of the right longitudinal beam (1202). The middle part of the lifting tube beam (120) is provided with a bridge A-type frame support (121). The middle section of the bridge reinforcement beam (1221) is provided with a rear axle A-type frame support (1220). The rear ends of the left longitudinal beam (1201) and the right longitudinal beam (1202) are fixedly connected to a pair of rear bumper supports (1211), and the rear bumper (9) is suspended on the pair of rear bumper supports (1211).

[0007] Preferably, it also includes: The front tube beam (1) is fixedly connected at both ends to the left front suspension longitudinal thrust support (1207) and the right front suspension longitudinal thrust support (1208), respectively. The upper ring beam (4) is erected and connected above a pair of front ring beams (1203); The lower parts of the left front support (210) and the right front support (220) are respectively connected to the left and right sides of the front bumper (1206); The crossbeam (3) is fixedly connected at both ends to the upper parts of the left front support (210) and the right front support (220), respectively; A pair of tubular beams (5), the front ends of which are fixedly connected to the left front support (210) or the right front support (220) respectively, and the front ends of which are fixedly connected to a pair of front ring beams (1203); The walkway beam (6) is located between the left front support (210) and the left front ring beam (1203).

[0008] Preferably, the middle bridge A-type frame support (121) is connected to the middle bridge A-type frame (10). The rear axle A-frame support (1220) is connected to the rear axle A-frame (11). A cross bracing plate (1213) is provided above the middle bridge reinforcing beam (1221). The rear axle reinforcing beam (1222) is covered with a tail bending plate (1212), which is in the shape of a semi-open shell.

[0009] Preferably, the left front suspension thrust support (1207) and the left front end beam (1204), and the right front suspension thrust support (1208) and the right front end beam (1205) are all fixedly connected by triangular boxes. The outer side plates of the left front suspension thrust support (1207) and the left front beam (1204) are respectively fitted with two right-angled surfaces, and the outer side plates of the right front suspension thrust support (1208) and the right front beam (1205) are respectively fitted with two right-angled surfaces to form a closed structure.

[0010] Preferably, the bending angle of the multi-directional bending plate is between 18-25°.

[0011] The pure electric off-highway dump truck includes a power system, suspension system, power battery assembly and mounting system, ATS cooling system, control system, body system, hydraulic lifting and steering system, hydraulic braking system, and also the aforementioned frame assembly.

[0012] Preferably, the power battery and suspension system includes a battery swapping upper frame (28) and a battery swapping base (29). The battery swapping base (29) is connected to a pair of battery pack supports (1219). The battery swapping upper frame (28) is located above the battery swapping base (29). The power battery is installed inside the battery swapping upper frame (28). The battery swapping upper frame (28) is provided with a charging port, a battery swapping connector, and a battery swapping connection interface at the top. The battery swapping connector is electrically connected to the high-voltage distribution box.

[0013] Preferably, the vehicle body system includes a cab (40), a pair of platforms (42), a battery pack assembly (51), an air conditioning system (47), a hood and air intake grille (43), a pair of passages (45), a dual-gun charging station assembly (49), and a cargo box (52). The cab (40) is located above the left front support (210) and is equipped with a supercharging system (48). The left platform (42) is located above the left front support (210) and the walkway beam (6), and the right platform (42) is located above the right front support (220) and the right front ring beam (1203). The battery pack assembly (51) The engine hood and air intake grille (43) are located on the right platform (42) and above the crossbeam (3) and upper ring beam (4) to cover the ATS radiator assembly (30), multi-function controller (35) and single main drive controller (37). A pair of channels (45) are respectively located in front of the left front support (210) and the right front support (220). The left channel (45) connects to the cab (40). The dual-gun charging jack assembly (49) is located in front of the right side of the front bumper (1206). The cargo box (52) is connected to the flip hinge bushing at the rear end of the left longitudinal beam (1201) and the right longitudinal beam (1202) by a pin.

[0014] Preferably, the power system includes a drive motor (13), a gearbox (14), a front axle (20), a middle axle (16), a rear axle (18), a wheel assembly (19), and an electric drive assembly mount (21). The gearbox (14) and the drive motor (13) constitute a power system and are connected to the left longitudinal beam (1201) and the right longitudinal beam (1202) through the electric drive assembly mount (21). The drive motor (13) includes a drive motor one (1301) and a drive motor two (1302) arranged in series behind a pair of front ring beams (1203). The front axle (20) is located below a pair of front ring beams (1203). The axle housing of the middle axle (16) is connected to the middle axle A-frame (10), and the axle housing of the rear axle (18) is connected to the rear axle A-frame (11).

[0015] Preferably, the ATS cooling system includes an ATS radiator assembly (30), an expansion tank (32), a water pump one (33), and a water pump two (34). The ATS radiator assembly (30) is connected to the left front beam (1204) and the right front beam (1205) via a radiator assembly mounting bracket (31) and is located behind the front bumper (1206).

[0016] Preferably, the suspension system includes a front suspension and a rear suspension. The front suspension includes a pair of front air springs (22), four longitudinal guide rods (23), and a lateral guide rod (24). The rear suspension includes four rear air springs (25), a pair of rear suspension accumulators (26), and four hose assemblies (27). The upper ends of the pair of front air springs (22) are connected to a pair of front ring beams (1203), and the other ends are connected to the front axle (20). One end of each of the four longitudinal guide rods (23) is connected to the left front suspension thrust bearing (1207) or the right front suspension thrust bearing. (1208) is connected to the front axle (20) at one end and to the front axle (20) at the other end. One end of the transverse guide rod (24) is connected to the lower part of the front ring beam (1203) and to the front axle (20) at the other end. The upper ends of the four rear air springs (25) are connected to the left support (1215), right support (1216), left support (1217), and right support (1218) of the middle axle suspension cylinder, respectively, and the lower ends are connected to the left and right sides of the middle axle (16) and the left and right sides of the rear axle (18), respectively.

[0017] Preferably, the hydraulic lifting and steering system includes a hydraulic lifting subsystem and a hydraulic steering subsystem sharing a common hydraulic source. The hydraulic lifting subsystem includes a lifting pump, a lifting control valve, a lifting cylinder one, and a lifting cylinder two. The cylinder seats of the lifting cylinder one and the lifting cylinder two are respectively connected to a pair of lifting supports (1209), and the piston rods are respectively connected to the left and right sides of the cargo box (52). The hydraulic steering subsystem includes an electric steering pump, a left steering cylinder, and a right steering cylinder. The cylinder seats of the left steering cylinder and the right steering cylinder are respectively located on the left steering cylinder support and the right steering cylinder support of the front axle (20), and the piston rods are respectively connected to the left steering knuckle arm and the right steering knuckle arm of the front axle (20).

[0018] Preferably, the hydraulic braking system includes a brake hydraulic oil tank, an electric brake pump, a dual-circuit filling valve, a front axle accumulator, a middle and rear axle accumulator, and a parking brake mechanism. The parking brake mechanism includes a parking brake valve assembly, a front axle service brake, a middle and rear axle service brake, and a parking brake.

[0019] Preferably, the control system includes a vehicle controller, which forms a first communication link with the transmission controller, the multi-function controller (35), and the single main drive controller (37) via a CAN bus. The vehicle controller also forms a second communication link with the smart terminal, instrument panel, gear shift lever, battery swapping system, ATS cooling system, and air conditioning system (47) via a CAN bus. Furthermore, the vehicle controller forms a third communication link with the debugging interface via a CAN bus. The multi-function controller (35) connects with the water pump (33), drive... The motor (1301), hydraulic lifting and steering system, hydraulic braking system, 24V battery, and air conditioning system (47) are electrically connected. The multi-function controller (35) is mounted on the left front beam (1204) and right front beam (1205) via the multi-function controller mounting bracket (36). The single main drive controller (37) is electrically connected to the water pump (34) and drive motor (1302). The single main drive controller (37) is mounted in front of a pair of front ring beams (1203) via the single main drive controller mounting bracket (38).

[0020] This utility model has at least the following beneficial effects: First, the frame assembly of this utility model has a left and right longitudinal beam as the main load-bearing structure. The left and right front beams adopt a box-type structure with multi-directional bending, which not only expands the installation space of the powertrain, but also forms an anti-torsional cavity through the splicing of sheet metal. The front suspension longitudinal thrust support and the front beam are connected by a right-angled triangular box. The stability of the triangle is used to concentrate the distributed load to the longitudinal beam, which enhances the bending stiffness of the front. The central round tube and the longitudinal beam form an anti-torsional frame. Together with the middle axle reinforcement beam and the rear axle reinforcement beam, it improves the torsional load distribution capability of the whole vehicle and avoids local stress concentration. The overall structural layout not only reserves precise installation space for battery, lifting and other systems, but also meets the requirements of long-term heavy-duty use through multi-part reinforcement design.

[0021] Secondly, this utility model of electric off-highway dump truck, relying on a high-strength frame assembly, can stably withstand large tonnage loads, avoiding structural deformation under heavy loads. Its load-bearing capacity is significantly improved compared to existing pure electric off-highway dump truck models. The power system achieves a dual-motor series layout, which, together with the gearbox, transmits power. The maximum gradeability exceeds 30%, easily handling steep slopes in mining areas. The integrated charging and swapping battery system is precisely fixed through the battery pack support of the frame assembly, supporting 5.5-minute fast battery swapping and 1-hour fast charging, reducing downtime for recharging. The lifting system works stably with the lifting support of the frame assembly, and the dual-cylinder design ensures efficient unloading under heavy loads. The rigid connection between the suspension system and the frame assembly can adapt to bumpy roads in mining areas. The hydraulic lifting and steering system, hydraulic braking system, and control system are rationally arranged, meeting the long-term stable operation needs of heavy-load, steep slope, and dusty environments in mining areas.

[0022] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the frame assembly structure of one technical solution of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the frame assembly structure of one technical solution of this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the battery and suspension system according to one technical solution of this utility model; Figure 4 This is a structural schematic diagram of a vehicle body system according to one technical solution of this utility model; Figure 5 This is a schematic diagram of the power system of one technical solution of this utility model; Figure 6 This is a schematic diagram of the structure of an ATS cooling system according to one technical solution of this utility model; Figure 7 This is a schematic diagram of the suspension system structure of one technical solution of this utility model. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0025] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0026] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "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 this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model.

[0027] Existing large-tonnage pure electric off-highway dump trucks mostly use bolted structures or conventional welding processes for their main frames, resulting in poor load-bearing capacity and low safety factors. Figure 1-2 As shown, this utility model provides a vehicle frame assembly, including: The left longitudinal beam (1201) and the right longitudinal beam (1202), as the main load-bearing structures, are spaced apart and parallel in the left and right directions. The cross-sectional width is designed with equal dimensions, and in particular, the cross-sectional height adopts a gradual transition to avoid sudden changes in stiffness and improve the reliability of the frame. The left front beam (1204) and the right front beam (1205) are connected in a continuous manner. The rear end of the left front beam (1204) is fixedly connected to the front end of the left longitudinal beam (1201), and the rear end of the right front beam (1205) is fixedly connected to the front end of the right longitudinal beam (1202). The structure is welded after insertion, which improves the rigidity of the overall frame and can withstand large bending loads, torsional loads and impact loads. The large cross-section box beam ensures a safety factor of more than 2.5 times for the frame. The front ends of the left front beam (1204) and the right front beam (1205) are fixedly connected to the front bumper (1206). A pair of anti-rollover brackets (7) are also provided on the left and right sides of the front bumper (1206) to place a pair of anti-rollover brackets (53) to prevent the vehicle from moving after it stops. The lower wing surfaces of the left front beam (1204) and the right front beam (1205) are respectively provided with left front suspension longitudinal thrust support (1207) and The right front suspension longitudinal thrust support (1208) increases the bending and torsional stiffness of the front of the frame assembly. The left front beam (1204) and the right front beam (1205) are both box structures formed by robotic welding of multi-directional bending plates. The weld strength is tested by pendulum test and the internal quality is tested by ultrasonic flaw detection. The upper surface of the box structure gradually slopes upward from front to back, and the front ends of the inner and outer side plates are bent outward. Preferably, the bending angle of the multi-directional bending plate is between 18-25°, which expands the space for the powertrain and cooling system and avoids sudden stiffness changes. The front beam is bent only once, that is, the left front beam (1204) and the right front beam (1205) are both bent outward, which expands the space between the left front beam (1204) and the right front beam (1205), so that the frame assembly can be adapted to different models of powertrain and ATS cooling system according to the requirements, which expands the space and improves adaptability. A pair of front ring beams (1203) are respectively fixedly installed at the connection between the left front beam (1204) and the left longitudinal beam (1201), and the right front beam (1205) and the right longitudinal beam (1202) to enhance the bending stiffness of the front of the frame assembly; A pair of battery pack supports (1219) are provided behind a pair of front ring beams (1203). The pair of battery pack supports (1219) are respectively fixed on the outer side of the left longitudinal beam (1201) and the right longitudinal beam (1202) to adapt to the weight distribution of large-tonnage battery packs. A circular tube beam (1214) is disposed behind the pair of front ring beams (1203) and is fixedly connected to the inner side of the left longitudinal beam (1201) and the right longitudinal beam (1202). The circular tube beam (1214) is a torsion beam, which can meet the requirement that the vehicle can withstand large torsional loads. The lifting tube beam (120) is located behind a pair of front ring beams (1203) and is fixedly connected to the lower flange of the left longitudinal beam (1201) and the right longitudinal beam (1202), providing stable support for the lifting cylinder one and the lifting cylinder two. The middle bridge reinforcement beam (1221) is located behind the circular tube beam (1214) and the lifting tube beam (120), and is fixedly connected to the inner side of the left longitudinal beam (1201) and the right longitudinal beam (1202) to enhance the load-bearing capacity of the frame at the middle bridge (16). The rear axle reinforcing beam (1222) is located behind the middle axle reinforcing beam (1221) and is fixedly connected to the inner side of the left longitudinal beam (1201) and the right longitudinal beam (1202) to enhance the load-bearing capacity of the frame at the rear axle (18).

[0028] In the above technical solution, the left longitudinal beam (1201) and the right longitudinal beam (1202) serve as the main load-bearing structures. The left front beam (1204) and the right front beam (1205) distribute the front load through the box structure. A pair of front ring beams (1203), circular tube beams (1214), middle bridge reinforcing beams (1221), and rear bridge reinforcing beams (1222) work together to improve the overall rigidity. A pair of battery pack supports (1219) provide the installation foundation for the battery system. The lifting tube beam (120) supports the hydraulic lifting system. All components are welded together to form a whole, which together bears various loads during vehicle driving and loading. Combined with the design of ultra-large cross-section box beams, the safety factor is ≥2.5, which can withstand greater bending, torsional loads and impacts, and meet the requirements of long-term heavy-duty use.

[0029] In another technical solution, a hydraulic lifting subsystem adapted to the vehicle frame assembly and a special support for the suspension system are provided. The outer walls of the left longitudinal beam (1201) and the right longitudinal beam (1202) are provided with a pair of lifting supports (1209) corresponding to the position of the lifting tube beam (120), which are adapted to the seats of the first and second lifting cylinders to distribute the lifting force; The left longitudinal beam (1201) and the right longitudinal beam (1202) are respectively provided with a left support (1215) and a right support (1216) for the middle bridge suspension cylinder on the outer side wall corresponding to the middle bridge reinforcing beam (1221). The left longitudinal beam (1201) and the right longitudinal beam (1202) are respectively provided with a left support (1217) and a right support (1218) for the rear axle suspension cylinder at the position corresponding to the rear axle reinforcing beam (1222) on the outer side wall of the left longitudinal beam (1201) and the right longitudinal beam (1202), which provide a connection point for the rear air spring (25) and improve the suspension stability. A lateral pusher (1210) is provided adjacent to the front of both the middle bridge reinforcing beam (1221) and the rear bridge reinforcing beam (1222). The lateral pusher (1210) is fixedly connected to the inner side of the right longitudinal beam (1202) to transmit lateral force and limit the lateral displacement of the middle bridge (16) and the rear bridge (18). The middle section of the lifting tube beam (120) is provided with a bridge A-type frame support (121) to improve the stability of unloading; The middle section of the bridge reinforcement beam (1221) is equipped with a rear axle A-type frame support (1220) to improve the reliability of the chassis; The rear ends of the left longitudinal beam (1201) and the right longitudinal beam (1202) are fixedly connected to a pair of rear bumper supports (1211). The pair of rear bumper supports (1211) are used to suspend and install the rear bumper (9) to improve the rear protection capability of the vehicle frame assembly. The rear ends of the left longitudinal beam (1201) and the right longitudinal beam (1202) are fixedly connected to an electrical bracket (8), which is located above the pair of rear bumper supports (1211) and is used to install electronic license plates and a 360-degree panoramic system.

[0030] In the above technical solution, a pair of lifting supports (1209) transmit the force of lifting cylinder one and lifting cylinder two to the left longitudinal beam (1201) and right longitudinal beam (1202) to avoid local stress concentration. The left support (1215) of the middle axle suspension cylinder, the right support (1216) of the middle axle suspension cylinder, the left support (1217) of the rear axle suspension cylinder and the right support (1218) of the rear axle suspension cylinder are connected to the rear air spring 25. Together with the lateral push support (1210), the excessive displacement of the middle axle (16) and the rear axle (18) during steering or tilting is limited. The rear bumper (9) is fixed by a pair of rear bumper supports (1211) to buffer the impact at the rear end of the frame assembly and improve the stability and safety of the whole vehicle.

[0031] In another technical solution, to further increase the overall height of the support structure at the front end of the chassis assembly, the chassis assembly also includes: The front tube beam (1) is fixedly connected at both ends to the left front suspension longitudinal thrust support (1207) and the right front suspension longitudinal thrust support (1208) respectively, thereby enhancing the overall rigidity of the left front suspension longitudinal thrust support (1207) and the right front suspension longitudinal thrust support (1208). The upper ring beam (4) is erected and connected above a pair of front ring beams (1203) to form a transverse integrated structure; The left front support (210) and the right front support (220) are respectively connected to the left and right sides of the front bumper (1206) to support the walkway and a pair of passages (45) for fixing the vehicle. The crossbeam (3) is fixedly connected at both ends to the upper part of the left front support (210) and the right front support (220) respectively, thereby enhancing the connection strength between the left front support (210) and the right front support (220); A pair of tubular beams (5) are respectively fixedly connected to the left front support (210) or the right front support (220) and fixedly connected to a pair of front ring beams (1203) at their front ends, so as to distribute the force of the left front support (210) and the right front support (220) to the pair of front ring beams (1203). The walkway beam (6) is located between the left front support (210) and the left front ring beam (1203) to support and fix the walkway on the left side of the cab.

[0032] In the above technical solution, the tube beam (1) and the upper ring beam (4) strengthen the connection of the front frame of the chassis assembly. The left front support (210) and the right front support (220) form a stable support structure with a pair of tube beams (5) through the cross beam (3). The walkway beam (6) provides the installation foundation for the platform. All components work together to disperse the load at the front of the chassis assembly, enhance the overall rigidity of the front of the chassis, improve the safety of the cab and the platform, facilitate personnel operation and maintenance, and meet the needs of mining operations.

[0033] In another technical solution, in order to further increase the overall height of the support structure at the rear end of the frame assembly, the middle axle A-frame support (121) is connected to the middle axle A-frame (10), distributing the load of the middle axle (16) to the left longitudinal beam (1201) and the right longitudinal beam (1202). The rear axle A-frame support (1220) is connected to the rear axle A-frame (11) to distribute the load of the rear axle (18) to the left longitudinal beam (1201) and the right longitudinal beam (1202). A cross brace plate (1213) is provided above the middle bridge reinforcing beam (1221) and is not connected to the middle bridge reinforcing beam (1221); The rear axle reinforcing beam (1222) is covered with a rear bending plate (1212), which is not connected to the rear axle reinforcing beam (1222). The rear bending plate (1212) is a semi-open shell shape, which is simple to manufacture and can close the rear of the frame assembly, thereby enhancing the bending and torsional resistance of the rear of the frame assembly. The rear bending plate (1212) is an integral multi-bending plate with a groove on the rear edge, which saves internal space of the frame and makes the rear suspension arrangement more reasonable.

[0034] In the above technical solution, the middle bridge A-frame (10) and the rear bridge A-frame (11) distribute the load of the middle bridge (16) and the rear bridge (18) to the left longitudinal beam (1201) and the right longitudinal beam (1202) through the special support middle bridge A-frame support (121) and the rear bridge A-frame support (1220). The cross brace (1213) enhances the local connection strength of the left longitudinal beam (1201) and the right longitudinal beam (1202) at the middle bridge (16). The tail bending plate (1212) enhances the local connection strength of the left longitudinal beam (1201) and the right longitudinal beam (1202) at the rear bridge (18). The semi-open design of the tail bending plate (1212) optimizes the spatial layout, avoids interference with other components, and improves the tail torsional resistance.

[0035] In another technical solution, to further improve structural strength, the left front suspension thrust support (1207) and the left front end beam (1204), and the right front suspension thrust support (1208) and the right front end beam (1205) are all fixedly connected by triangular boxes. The outer side plates of the left front suspension longitudinal thrust support (1207) and the left front beam (1204) are respectively fitted with two right-angled surfaces, and the outer side plates of the right front suspension longitudinal thrust support (1208) and the right front beam (1205) are respectively fitted with two right-angled surfaces to form a closed structure. The connection strength is enhanced by utilizing the stability of triangles. The welding of the plate and the rectangular tube is simple and has high structural strength.

[0036] In the above technical solution, the right angle surface of the triangular box is welded to the outer side plate and lower wing surface of the front suspension thrust support (1207) and the front beam (1204) to form a closed structure, which significantly improves the connection strength of the front suspension thrust support (1207) and the front beam (1204), distributes the front load through the triangular structure, reduces stress concentration, enhances the bending and torsional stiffness of the front of the frame, and adapts to the front force requirements under complex road conditions in the mining area.

[0037] Existing pure electric off-highway dump trucks suffer from insufficient main frame performance, resulting in inadequate overall load-bearing capacity, power performance, energy replenishment efficiency, and system coordination in meeting the demands of large-tonnage mining areas. This application provides a pure electric off-highway dump truck, including a power system, suspension system, power battery assembly and mounting system, ATS cooling system, control system, body system, hydraulic lifting and steering system, and hydraulic braking system. It also includes the aforementioned frame assembly, providing a high-strength mounting foundation for each system and enabling coordinated operation.

[0038] In the above technical solution, the chassis assembly bears the weight of each system and transmits the load, solving the problem of insufficient load-bearing capacity of existing vehicles. The power system provides driving force, the suspension system buffers vibration, the power battery system provides energy and supports charging and swapping, the cooling system maintains the temperature of components, the hydraulic system realizes lifting, steering and braking, and the control system coordinates the work of each system. All systems rely on the chassis to achieve synergy, improving the overall vehicle's power, safety and operating efficiency, and adapting to the transportation needs of large-tonnage mining areas.

[0039] Existing power battery systems lack dedicated battery swapping adapter structures for their battery packs, and the dispersed arrangement of thermal management components and batteries results in low space utilization, failing to meet the installation requirements of large-tonnage, rapid battery swapping in electric vehicles. In another technical solution, such as... Figure 3 As shown, the power battery and suspension system include a battery swapping upper frame (28) and a battery swapping base (29). The battery swapping base (29) can be rigidly connected to a pair of battery pack supports (1219) by bolts. The battery swapping upper frame (28) is located above the battery swapping base (29). The battery swapping upper frame (28) contains a power battery, a thermal management system, and a high-voltage box. The thermal management system includes an expansion tank, water pipes, high and low voltage wiring harnesses, and a water-cooling unit. The battery swapping upper frame (28) is equipped with a charging port and a battery swapping connector. Specifically, the left... The side is equipped with a charging port, the bottom is equipped with a battery swapping connector, and the top is equipped with a battery swapping connection interface. The battery swapping connector is electrically connected to the high-voltage distribution box. The power battery serves as the power source for the whole vehicle, realizing vehicle electrification and producing no pollutants. It can be charged by connecting to a charging pile through the dual-gun charging socket assembly (49), and can also be swapped, greatly improving the vehicle's operating efficiency. The power battery provides high-voltage power to the high-voltage distribution box, and through the high-voltage distribution box, it provides low-voltage or high-voltage, AC or DC power to the components in the vehicle that require power. It can better adapt to the equipment application conditions in the mining area. A battery swap can be completed in 5.5 minutes, effectively improving the operating efficiency of the pure electric dump truck. It integrates a thermal management system, making the overall vehicle layout more compact and aesthetically pleasing.

[0040] In the above technical solution, the battery swapping base (29), a pair of battery pack supports (1219), and the battery swapping top frame (28) form a three-layer installation structure of support-base-top frame, which improves the stability of the battery system in the event of bumps. The battery swapping top frame (28) integrates the battery, thermal management system and high voltage box, reducing space occupation and adapting to the battery layout requirements of electric vehicles. The positions of the charging port on the left, the bottom battery swapping connector and the top battery swapping connection interface are adapted to the space outside the frame. When swapping batteries, the positioning structure of the top frame and the base is used to achieve quick docking.

[0041] The existing driver's cab lacks a pressurized sealing structure and has insufficient platform protection, failing to meet the operational safety and cab environment requirements of electric locomotives in mining areas. In another technical solution, such as... Figure 4As shown, the vehicle body system includes a cab (40), a pair of platforms (42), a battery pack assembly (51), an air conditioning system (47), a hood and air intake grille (43), a pair of passages (45), a dual-gun charging station assembly (49), and a cargo box (52). The cab (40) is located above the left front support (210). The cab (40) includes an adjustable shock-absorbing main seat and a passenger seat. The cab (40) is a sealed structure. A supercharging system (48) is located on the right side of the cab (40), above the hood and air intake grille (43). The supercharging end of the supercharging system (48) is connected to the interior of the cab (40), thus powering the cab. The internal pressure is higher than atmospheric pressure, which has a good sealing effect on the cab (40). The left platform (42) is set above the left front support (210) and the walkway beam (6). The right platform (42) is set above the right front support (220) and the right front ring beam (1203). The platform (42) is equipped with guardrails and kick plates. The platform (42) is equipped with anti-slip patterns. The battery box assembly (51) is set on the right platform (42) to provide low-voltage power to the whole vehicle. The centralized lubrication assembly (50) is set on the right platform (42) and includes a lubrication pump, a progressive distributor, pipelines and accessories to provide lubrication for the moving parts of the whole vehicle and avoid mechanical wear. The air conditioning system (47) includes a condenser assembly, an air conditioning integrated unit, an expansion tank assembly, pipes and accessories, and a control harness, which regulates the temperature inside the vehicle cab. The hood and air intake grille (43) are located above the crossbeam (3) and the upper ring beam (4) to cover the ATS radiator assembly (30), the multi-function controller (35), and the single main drive controller (37), and have waterproof and protective functions. It is hinged and can be opened to perform maintenance work on the single main drive controller (37) and the multi-function controller (35). The two sides of the pair of platforms (42) are provided with vision components (44), including two rearview mirror assemblies and one lower view mirror assembly. The passage (45) is respectively set in front of the left front support (210) and the right front support (220). The left passage (45) connects to the cab (40) and the right passage (45) connects to the right platform (42). The dual-gun charging assembly (49) is set in front of the right side of the front bumper (1206) and is connected to the battery system through a high-voltage wiring harness to realize the charging function of the whole vehicle battery. The cargo box (52) is connected to the flip hinge bushing at the rear end of the left longitudinal beam (1201) and the right longitudinal beam (1202) through a pin shaft. It includes a bottom plate, a left side plate, a right side plate, a front plate and a visor. The bottom plate is provided with a flip hinge at the rear end to lift the cargo box and realize the loading of materials in the vehicle.

[0042] In the above technical solution, the cab (40), a pair of platforms (42), engine cover and air intake grille (43), and cargo box (52) constitute the overall appearance of the vehicle, realizing the unique styling design of this vehicle. The vision component (44), air conditioning system (47), and supercharging system (48) enable the cab to meet the comfort requirements of driving and operation of the vehicle. The cargo box realizes the loading function of materials. The dual-gun charging station assembly (49) realizes the rapid charging of the vehicle, improving the overall operating efficiency of the vehicle. The centralized lubrication assembly (50) realizes the automatic lubrication of the moving parts of the vehicle, improving maintenance efficiency, thereby improving the operating efficiency of the vehicle.

[0043] To further improve the load-bearing capacity of pure electric off-highway dump trucks, another technical solution, such as... Figure 5As shown, the power system includes a drive motor (13), a gearbox (14), a front axle (20), a middle axle (16), a rear axle (18), a wheel assembly (19), and an electric drive assembly mount (21). The gearbox (14) and the drive motor (13) constitute the power assembly and are connected to the left longitudinal beam (1201) and the right longitudinal beam (1202) through the electric drive assembly mount (21). The gearbox (14) is an AMT gearbox, which uses a heavy-load gear for heavy loads and an unloaded gear for no loads. It is safe and reliable with concentrated operating points. The drive motor (13) includes a pair of front and rear axles connected in series. The drive motor 1 (1301) and drive motor 2 (1302) behind the front ring beam (1203) are capable of climbing slopes exceeding 30%, realizing energy recovery on downhill slopes. They are suitable for extreme working conditions such as acceleration, slope, and getting stuck. They are powerful. The output end of drive motor 2 (1302) is connected to the input end of the gearbox (14). The output end of the gearbox (14) is connected to the input end flange of the middle axle drive shaft (15). The input end of the middle axle (16) is connected to the output end of the middle axle drive shaft (15). The input end of the rear axle drive shaft (17) is connected to the output end flange of the middle axle (16). The output end of the rear axle driveshaft (17) is connected to the input end of the rear axle (18). The front axle (20) is located below a pair of front ring beams (1203). The axle housing of the middle axle (16) is connected to the middle axle A-frame (10). The axle housing of the rear axle (18) is connected to the rear axle A-frame (11). The front axle (20), middle axle (16), and rear axle (18) are all cast. The axle housings are thickened. The brakes are hydraulic caliper discs with parking brake discs. The middle axle (16) and rear axle (18) are equipped with a main reducer and a wheel-side reducer. The wheel assemblies (19) are respectively located on the front axle (16, 17, 18, 18, 18, 19 ... 20) The two ends of the middle axle (16) and the rear axle (18) realize the driving and walking functions of the vehicle, forming a 6×4 driving form. The front axle (20) realizes the vehicle steering function, and the middle axle (16) and the rear axle (18) drive the vehicle. Compared with the 4×2 driving form, under certain load conditions, the load-bearing capacity of a single axle is effectively reduced. The tire body adopts a high-strength and high-load-bearing design. A stone abutment (41) is set in the gap of each tire to prevent stones from getting stuck between the tires. The front wheel mudguards (46) are set at the front and rear positions of the front wheels on both sides to protect the components near the front wheels.

[0044] In the above technical solution, the suspension structure of the dual motors reduces vibration transmission and is adapted to the installation requirements of the electric vehicle motor. The middle axle (16) is connected to the middle axle A-frame (10) through the middle axle A-frame support (121), and the rear axle (18) is connected through the rear axle A-frame support (1220), forming a force transmission of motor suspension-bridge housing-frame-vehicle frame, distributing the load to the left longitudinal beam (1201), right longitudinal beam (1202), middle axle reinforcing beam (1221), and rear axle reinforcing beam (1222), improving the structural reliability when bearing heavy loads, and conforming to the heavy load design of pure electric off-highway dump trucks.

[0045] The existing cooling system's radiator-to-frame connection structure is too simple to meet the cooling requirements of a tram's dual motors. In another technical solution, such as... Figure 6 As shown, the ATS cooling system includes an ATS radiator assembly (30), an expansion tank (32), a water pump one (33), and a water pump two (34). The ATS radiator assembly (30) is connected to the left front beam (1204) and the right front beam (1205) via a radiator assembly mounting bracket (31), and is located behind the front bumper (1206) to dissipate heat from the water in the entire circulating water circuit. The expansion tank (32) is located above the ATS radiator assembly (30) and is connected to the expansion tank via pipes and accessories. 39) Connected to the ATS radiator assembly (30) for storing coolant. Water pump one (33) and water pump two (34) are located below the ATS radiator assembly (30). Pipes are arranged along the inner side of the left longitudinal beam (1201) and the right longitudinal beam (1202) and fixed by pipe clamps to form a compact front-end centralized heat dissipation structure, realizing the circulation of coolant in the entire heat dissipation circuit. The multi-in-one controller (35) and the single main drive controller (37) can maintain a stable operating temperature under high-intensity working conditions and maintain the optimal working state.

[0046] In the above technical solution, the ATS radiator assembly (30) is connected and installed with the left front beam (1204) and the right front beam (1205) through the radiator assembly mounting bracket (31), which improves the installation stability. The stacked layout with the expansion tank (32) on top and the water pump one (33) and water pump two (34) on the bottom, along with the pipeline routing along the left longitudinal beam (1201) and the right longitudinal beam (1202), avoids interference with the powertrain, adapts to the heat dissipation space requirements of the electric vehicle's dual motors, and has a compact structure that is easy to maintain.

[0047] The existing air spring suspension system cannot meet the stability support and vibration damping requirements of trams under heavy loads. In another technical solution, such as... Figure 7As shown, the suspension system includes a front suspension and a rear suspension. The front suspension adopts a non-independent air suspension structure, including a pair of front air springs (22), four longitudinal guide rods (23), and a lateral guide rod (24). The rear suspension adopts a mid-rear single-sided series air suspension structure, including four rear air springs (25), a pair of rear suspension accumulators (26), and four hose assemblies (27). The upper ends of the pair of front air springs (22) are connected to a pair of front ring beams (1203), and the other ends are connected to the front axle (20). One end of each of the four longitudinal guide rods (23) is connected to the left front suspension thrust bearing (1207) or the right front suspension thrust bearing (1208), and the other ends are connected to the front axle (20). One end of each of the lateral guide rods (24) is connected to the lower part of the front ring beam (1203), and the other ends are connected to the front axle (20). The four rear air springs (25) include a mid-rear single-sided series air suspension, a pair of rear suspension accumulators (26), and a pair of rear suspension accumulators (27). The rear air spring, the middle right air spring, the rear left air spring, and the rear right air spring are respectively connected as follows: the upper end of the middle left air spring is connected to the left support (1215) of the middle axle suspension cylinder, and the lower end is connected to the left side of the middle axle (16); the upper end of the middle right air spring is connected to the right support (1216) of the middle axle suspension cylinder, and the lower end is connected to the right side of the middle axle (16); the upper end of the rear left air spring is connected to the left support (1217) of the rear axle suspension cylinder. The upper end of the right rear air spring is connected to the right support (1218) of the rear axle (18), and the lower end is connected to the right side of the rear axle (18). The middle left rear air spring and the rear left rear air spring are connected to the left rear suspension accumulator (26) through the hose assembly (27). The middle right rear air spring and the rear right rear air spring are connected to the right rear suspension accumulator (26) through the hose assembly (27).

[0048] In the above technical solution, a rigid constraint structure of support-spring-guide rod is adopted to improve load-bearing stability, and ultimately realize the vibration buffering requirements of pure electric off-highway dump trucks under large tonnage. It can effectively reduce the impact of unsprung vibration on vehicle reliability and greatly improve comfort.

[0049] In order to further meet the requirements of precise control and structural reliability of the hydraulic lifting and steering system of pure electric off-highway dump truck, in another technical solution, the hydraulic lifting and steering system includes a hydraulic lifting subsystem and a hydraulic steering subsystem with a common hydraulic source. The hydraulic lifting subsystem includes a lifting pump, a lifting control valve, a lifting cylinder one, and a lifting cylinder two. The cylinder seats of the lifting cylinder one and the lifting cylinder two are respectively connected to a pair of lifting supports (1209), and the piston rods are respectively connected to the left and right sides of the cargo box (52). The hydraulic lifting subsystem realizes the lifting, holding and lowering actions of the entire vehicle on the cargo box (52), monitors the pressure of the lifting subsystem in real time, facilitates the fault diagnosis of the lifting subsystem, and is equipped with an emergency lifting interface so that when the cargo box (52) cannot be lifted and unloaded in an emergency, the lifting subsystem of the rescue vehicle can be used to realize the lifting and unloading and lowering of the cargo box. The hydraulic steering subsystem includes an electric steering pump, a left steering cylinder, and a right steering cylinder. The cylinder seats of the left and right steering cylinders are respectively mounted on the left steering cylinder support and the right steering cylinder support of the front axle (20), and the piston rods are respectively connected to the left steering knuckle arm and the right steering knuckle arm of the front axle (20). The hydraulic steering subsystem realizes the normal steering function of the vehicle, the automatic or manual emergency steering function, and monitors the steering subsystem pressure in real time, which facilitates the diagnosis of steering system faults.

[0050] This technical solution has been separately applied for, application number 2025215647094, and is not considered an improvement point of this application. To make the technical solution clearer, its operating mechanism is briefly described as follows: The hydraulic oil tank stores and naturally cools the hydraulic fluid. It contains an internal suction filter with its inlet connected to the tank's interior and its outlet extending to the outside, filtering impurities from the fluid. A level and temperature sensor, partially inserted into the tank, is mounted on the upper part of the tank. This sensor monitors the fluid temperature and level in real time and transmits the signals to the vehicle control unit (VCU) to alert the driver to the fluid status.

[0051] In the steering system, the emergency steering pump is a low-pressure motor pump assembly, serving as an emergency steering power source; the electric steering pump is a high-pressure motor pump assembly, controlled by a multi-function controller (35), providing normal steering power. The outlet pipes of the emergency steering pump and the electric steering pump are respectively equipped with check valve one and check valve two to prevent oil backflow. After the oil passes through the check valve, it enters the high-pressure filter, and the pressure sensor one at its inlet can monitor the working pressure of the steering system; after filtration, the oil flows to the inlet of the priority valve, which distributes the oil according to the valve core position: its steering port is connected to the inlet of the hydraulic steering gear, its lifting port is connected to the inlet of the lifting control valve, its return port is connected to the inlet of the return oil filter (70), and its control port is connected to the control port of the hydraulic steering gear. The return port of the hydraulic steering gear merges with the return port of the priority valve and is connected to the return oil filter (70). Its working port A connects to the small chamber of the left steering cylinder and the large chamber of the right steering cylinder, and its working port B connects to the large chamber of the left steering cylinder and the small chamber of the right steering cylinder. The two ends of the left and right steering cylinders are respectively installed on the steering cylinder support and steering knuckle arm of the front axle (20), and steering is achieved by extension and retraction. When the driver turns the steering wheel, the hydraulic oil in the control port of the hydraulic steering gear enters the control port of the priority valve, controls the position of the valve core to distribute the flow, and ensures smooth steering. When the electric steering pump fails, the emergency steering pump can be started automatically or manually to provide power.

[0052] The lifting pump of the lifting system shares the suction filter and hydraulic oil tank with the steering system to provide power to the lifting system. Its outlet is connected to the oil inlet of the lifting control valve. The drain port of the lifting control valve returns directly to the oil tank, and the return port returns to the oil tank through the return oil filter (70). The pressure detection port is equipped with pressure sensor two (7102) to monitor the lifting pressure. Its working port A1 is divided into two paths: one path is connected to lifting cylinder one and lifting cylinder two through ball valve one. The two cylinders are respectively installed on both sides of the lifting support (1209) of the main frame (12) and the cylinder connecting seat on the bottom plate of the cargo box (52), which can control the lifting, holding or lowering of the cargo box; the other path is connected to the quick connector through ball valve two as an emergency lifting interface, which can be lifted with the help of external power in case of failure. The lifting system is also equipped with a lower stop switch and an upper stop switch to detect whether the cargo box is in place; the driver controls the position of the lifting control valve core by operating the lifting electric control handle with an electrical signal to realize the movement of the cargo box.

[0053] In the above technical solution, the cylinder seats of lifting cylinder one and lifting cylinder two are connected to the ear plates of a pair of lifting supports (1209) through pin shafts, and the piston rod is hinged to the cylinder connecting seat of the cargo box (52) bottom plate to form a symmetrical double-cylinder lifting structure, which improves lifting stability. The cylinder seats of the left steering cylinder and the right steering cylinder are fixed on the steering cylinder support of the front axle (20), and the piston rod is hinged to the bushing of the steering knuckle arm. The pipeline is fixed along the inner side of the longitudinal beam and separated from the frame through the pipe clamp to avoid vibration and wear, ensure steering accuracy, and meet the structural reliability requirements of the electric vehicle hydraulic system.

[0054] To further meet the requirements of braking safety and structural compactness of the hydraulic braking system of pure electric off-highway dump trucks, in another technical solution, the hydraulic braking system includes a brake hydraulic oil tank, an electric brake pump, a dual-circuit filling valve, a front axle accumulator, a middle and rear axle accumulator, and a parking brake mechanism. The parking brake mechanism includes a parking brake valve group, a front axle service brake, a middle and rear axle service brake, and a parking brake. The service brakes of the front axle (20) and the service brakes of the middle axle (16) and rear axle (18) are two independent circuits that do not interfere with each other, have good reliability, high safety, and flexible control. The medium of the braking system is hydraulic oil, which can be considered approximately incompressible and is always full of hydraulic lines. Therefore, the braking command can be quickly transmitted to the front axle service brake, the middle and rear axle service brake, and the parking brake at the wheel. The service brake has high sensitivity and fast response speed, and there will be no situation where the air brake system freezes in winter. The accumulators of the front axle and the middle and rear axles set in the parking brake circuit can absorb the impact of the hydraulic system, maintain the stability of the parking brake release pressure, and improve the reliability of the parking brake release. The performance is stable.

[0055] This technical solution has been separately applied for, application number 2025215647696, and is not considered an improvement point of this application. To make the technical solution clearer, its operating mechanism is briefly described as follows: The brake hydraulic oil tank has a built-in suction filter, whose inlet end is connected to the inside of the tank, and whose outlet end is connected to the inlet of the electric brake pump through a large-diameter ball valve, which can filter impurities in the oil. The outlet of the electric brake pump is equipped with a brake high-pressure filter, which is equipped with a differential pressure alarm (used to monitor filter element blockage). The filtered oil is connected to the inlet of the dual-circuit filling valve through a pipeline.

[0056] The dual-circuit filling valve has two outlets connected to the front axle accumulator and the middle and rear axle accumulators, respectively. Each of the two lines has an oil manifold with pressure sensor 1 and pressure sensor 2 mounted on it, respectively, to monitor the circuit pressure in real time and provide feedback to the VCU. The filling valve limits the system pressure. When the pressure is lower than the set value, the vehicle control unit (VCU) controls the electric brake pump to replenish the pressure; once the pressure reaches the set value, the pump stops operating, and the accumulators maintain pressure.

[0057] The front axle accumulator and the middle and rear axle accumulators are respectively connected to the two oil inlets of the dual-circuit foot brake valve. One working port of the foot brake valve (80) is connected to the front axle relay valve and the emergency stop valve through a shuttle valve, and the other working port is connected to the emergency stop valve. Pressure sensor five (monitoring control oil pressure) is installed on the emergency stop valve, and its working port is connected to the middle and rear axle relay valve. The front axle relay valve and the middle and rear axle relay valve are respectively connected to the front axle service brake and the middle and rear axle service brake. Pressure sensor four and pressure sensor three (monitoring brake pressure) are respectively installed near the brake oil inlet.

[0058] The bypass port of the dual-circuit filling valve is connected to the inlet of the parking brake valve. A check valve (to prevent backflow) is installed inside the valve. It then splits into two paths: one path connects to the parking brake accumulator via an external port; the other path connects to solenoid directional valve one and solenoid directional valve three. Solenoid directional valve one connects to the parking brake via solenoid directional valve two and pressure reducing valve two. Pressure sensor seven (monitoring release pressure) and pressure switch one (turning off the parking brake light when the pressure reaches the target) are installed near the brake inlet. Solenoid directional valve three connects to the inter-axle differential via pressure reducing valve one. Pressure switch two is installed near its inlet (illuminating the inter-axle differential lock light when the pressure reaches the target). Solenoid directional valve two is a redundant design, allowing for parking brake backflow in case of a failure of solenoid directional valve one.

[0059] In the above technical solution, the rigid installation structure of the axle housing-front axle service brake and rear axle service brake (85)-parking brake valve group-frame assembly improves the braking transmission efficiency, has a compact structure and is easy to maintain, and is suitable for the high requirements of pure electric off-highway dump trucks for braking safety.

[0060] To further meet the structural stability requirements of the control system layout and collaborative operation of pure electric off-highway dump trucks, in another technical solution, the control system includes a vehicle controller (VCU). The VCU controls all systems of the vehicle, ensuring that each system operates normally according to logic, and guaranteeing that the vehicle is in an efficient and comfortable operating range. The VCU forms a first communication link with the transmission controller, multi-function controller (35), and single main drive controller (37) via the CAN bus. The VCU forms a second communication link with the intelligent terminal, instrument panel, gear shift lever, battery swapping system, ATS cooling system, and air conditioning system (47) via the CAN bus. The VCU forms a third communication link with the debugging interface via the CAN bus, facilitating the addition of vehicle functions and... After debugging, the multi-function controller (35) is electrically connected to water pump 1 (33), drive motor 1 (1301), hydraulic lifting and steering system, hydraulic braking system, 24V battery (to provide power to the low-voltage electrical system of the whole vehicle, ensuring that each low-voltage electrical system is in normal operation), and air conditioning system (47) (the operation of air conditioning compressor and liquid heater PTC, i.e. the operation of the heating system, ultimately ensuring the normal operation of the whole machine power supply system). The multi-function controller (35) is set above the left front beam (1204) and right front beam (1205) through the multi-function controller mounting bracket (36). The single main drive controller (37) is electrically connected to water pump 2 (34) and drive motor 2 (1302). The single main drive controller (37) is set in front of a pair of front ring beams (1203) through the single main drive controller mounting bracket (38).

[0061] In the above technical solution, the wiring layout of each controller and component improves installation stability, avoids loosening of wiring due to vibration, keeps the wiring orderly, adapts to the structural requirements of multiple controllers working together in pure electric off-highway dump trucks, and facilitates inspection and maintenance.

[0062] The number of devices and processing capacity described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0063] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A frame assembly, characterized in that, include: Left longitudinal beam (1201) and right longitudinal beam (1202); The left front beam (1204) and the right front beam (1205) are provided. The rear end of the left front beam (1204) is fixedly connected to the front end of the left longitudinal beam (1201), and the rear end of the right front beam (1205) is fixedly connected to the front end of the right longitudinal beam (1202). The front ends of the left front beam (1204) and the right front beam (1205) are fixedly connected to the front bumper (1206). The lower wing surfaces of the left front beam (1204) and the right front beam (1205) are respectively provided with a left front suspension longitudinal thrust support (1207) and a right front suspension longitudinal thrust support (1208). The left front beam (1204) and the right front beam (1205) are both box structures formed by splicing multi-directional bending plates. The upper surface of the box structure gradually slopes upward from front to back, and the front ends of the inner side plate and the outer side plate are bent outward. A pair of front ring beams (1203) are respectively fixedly installed at the connection between the left front beam (1204) and the left longitudinal beam (1201), and the right front beam (1205) and the right longitudinal beam (1202); A pair of battery pack supports (1219) are provided behind a pair of front ring beams (1203), and the pair of battery pack supports (1219) are respectively fixedly provided on the outer side of the left longitudinal beam (1201) and the right longitudinal beam (1202); A circular tube beam (1214) is disposed behind the pair of front ring beams (1203) and is fixedly connected to the inner surfaces of the left longitudinal beam (1201) and the right longitudinal beam (1202); The lifting tube beam (120) is located behind a pair of front ring beams (1203) and is fixedly connected to the lower flanges of the left longitudinal beam (1201) and the right longitudinal beam (1202); The middle bridge reinforcing beam (1221) is located behind the circular tube beam (1214) and the lifting tube beam (120), and is fixedly connected to the inner side of the left longitudinal beam (1201) and the right longitudinal beam (1202); The rear axle reinforcing beam (1222) is located behind the middle axle reinforcing beam (1221) and is fixedly connected to the inner surfaces of the left longitudinal beam (1201) and the right longitudinal beam (1202).

2. The frame assembly according to claim 1, characterized in that, A pair of lifting supports (1209) are provided on the outer walls of the left longitudinal beam (1201) and the right longitudinal beam (1202) at the positions corresponding to the lifting tube beam (120). The left longitudinal beam (1201) and the right longitudinal beam (1202) are respectively provided with a left support (1215) and a right support (1216) for the middle bridge suspension cylinder on the outer side wall corresponding to the middle bridge reinforcing beam (1221). The left longitudinal beam (1201) and the right longitudinal beam (1202) are respectively provided with a left support (1217) and a right support (1218) for the rear axle suspension cylinder on the outer side wall corresponding to the position of the rear axle reinforcing beam (1222). A transverse pusher (1210) is provided adjacent to the front of both the middle bridge reinforcing beam (1221) and the rear bridge reinforcing beam (1222), and the transverse pusher (1210) is fixedly connected to the inner side of the right longitudinal beam (1202). The middle part of the lifting tube beam (120) is provided with a bridge A-type frame support (121). The middle section of the bridge reinforcement beam (1221) is provided with a rear axle A-type frame support (1220). The rear ends of the left longitudinal beam (1201) and the right longitudinal beam (1202) are fixedly connected to a pair of rear bumper supports (1211), and the rear bumper (9) is suspended on the pair of rear bumper supports (1211).

3. The frame assembly according to claim 2, characterized in that, Also includes: The front tube beam (1) is fixedly connected at both ends to the left front suspension longitudinal thrust support (1207) and the right front suspension longitudinal thrust support (1208), respectively; The upper ring beam (4) is erected and connected above a pair of front ring beams (1203); The lower parts of the left front support (210) and the right front support (220) are respectively connected to the left and right sides of the front bumper (1206); The crossbeam (3) is fixedly connected at both ends to the upper parts of the left front support (210) and the right front support (220), respectively; A pair of tubular beams (5), the front ends of which are fixedly connected to the left front support (210) or the right front support (220) respectively, and the front ends of which are fixedly connected to a pair of front ring beams (1203); The walkway beam (6) is located between the left front support (210) and the left front ring beam (1203).

4. The frame assembly according to claim 3, characterized in that, The middle bridge A-type frame support (121) is connected to the middle bridge A-type frame (10). The rear axle A-frame support (1220) is connected to the rear axle A-frame (11). A cross bracing plate (1213) is provided above the middle bridge reinforcing beam (1221). The rear axle reinforcing beam (1222) is covered with a tail bending plate (1212), which is in the shape of a semi-open shell.

5. The frame assembly according to claim 3, characterized in that, The left front suspension longitudinal thrust support (1207) and the left front end beam (1204), and the right front suspension longitudinal thrust support (1208) and the right front end beam (1205) are all fixedly connected by triangular boxes. The outer side plates of the left front suspension thrust support (1207) and the left front beam (1204) are respectively fitted with two right-angled surfaces, and the outer side plates of the right front suspension thrust support (1208) and the right front beam (1205) are respectively fitted with two right-angled surfaces to form a closed structure.

6. The frame assembly according to claim 3, characterized in that, The bending angle of the multi-directional bending plate is between 18-25°.

7. A pure electric off-highway dump truck, comprising a power system, suspension system, power battery assembly and mounting system, ATS cooling system, control system, body system, hydraulic lifting and steering system, and hydraulic braking system, characterized in that, It also includes the frame assembly as described in any one of claims 3-6.

8. The pure electric off-highway dump truck according to claim 7, characterized in that, The power battery and suspension system include a battery swapping upper frame (28) and a battery swapping base (29). The battery swapping base (29) is connected to a pair of battery pack supports (1219). The battery swapping upper frame (28) is located above the battery swapping base (29). The power battery is installed inside the battery swapping upper frame (28). The battery swapping upper frame (28) is provided with a charging port, a battery swapping connector, and a battery swapping connection interface at the top. The battery swapping connector is electrically connected to the high-voltage distribution box.

9. The pure electric off-highway dump truck according to claim 8, characterized in that, The ATS cooling system includes an ATS radiator assembly (30), an expansion tank (32), a water pump one (33), and a water pump two (34). The ATS radiator assembly (30) is connected to the left front beam (1204) and the right front beam (1205) via a radiator assembly mounting bracket (31) and is located behind the front bumper (1206).

10. The pure electric off-highway dump truck according to claim 9, characterized in that, The vehicle body system includes a cab (40), a pair of platforms (42), a battery pack assembly (51), an air conditioning system (47), a hood and air intake grille (43), a pair of passageways (45), a dual-gun charging station assembly (49), and a cargo box (52). The cab (40) is located above the left front support (210) and is equipped with a supercharging system (48). The left platform (42) is located above the left front support (210) and the walkway beam (6), and the right platform (42) is located above the right front support (220) and the right front ring beam (1203). The battery pack assembly (51) is located on... The right platform (42) has the hood and air intake grille (43) located above the crossbeam (3) and the upper ring beam (4) to cover the ATS radiator assembly (30), the multi-function controller (35), and the single main drive controller (37). A pair of channels (45) are located in front of the left front support (210) and the right front support (220), respectively. The left channel (45) connects to the cab (40). The dual-gun charging assembly (49) is located in front of the right side of the front bumper (1206). The cargo box (52) is connected to the flip hinge bushing at the rear end of the left longitudinal beam (1201) and the right longitudinal beam (1202) by a pin.

11. The pure electric off-highway dump truck according to claim 7, characterized in that, The power system includes a drive motor (13), a gearbox (14), a front axle (20), a middle axle (16), a rear axle (18), a wheel assembly (19), and an electric drive assembly mount (21). The gearbox (14) and the drive motor (13) constitute a power system and are connected to the left longitudinal beam (1201) and the right longitudinal beam (1202) through the electric drive assembly mount (21). The drive motor (13) includes a drive motor one (1301) and a drive motor two (1302) arranged in series behind a pair of front ring beams (1203). The front axle (20) is located below a pair of front ring beams (1203). The axle housing of the middle axle (16) is connected to the middle axle A-frame (10), and the axle housing of the rear axle (18) is connected to the rear axle A-frame (11).

12. The pure electric off-highway dump truck according to claim 11, characterized in that, The suspension system includes a front suspension and a rear suspension. The front suspension includes a pair of front air springs (22), four longitudinal guide rods (23), and a lateral guide rod (24). The rear suspension includes four rear air springs (25), a pair of rear suspension accumulators (26), and four hose assemblies (27). The upper ends of the pair of front air springs (22) are connected to a pair of front ring beams (1203), and the other ends are connected to the front axle (20). One end of each of the four longitudinal guide rods (23) is connected to the left front suspension thrust bearing (1207) or the right front suspension thrust bearing (1208). 08) The other end is connected to the front axle (20). One end of the transverse guide rod (24) is connected to the lower part of the front ring beam (1203), and the other end is connected to the front axle (20). The upper ends of the four rear air springs (25) are respectively connected to the left support (1215), the right support (1216), the left support (1217), and the right support (1218) of the middle axle suspension cylinder, and the lower ends are respectively connected to the left and right sides of the middle axle (16) and the left and right sides of the rear axle (18).

13. The pure electric off-highway dump truck according to claim 11, characterized in that, The hydraulic lifting and steering system includes a hydraulic lifting subsystem and a hydraulic steering subsystem sharing a common hydraulic source. The hydraulic lifting subsystem includes a lifting pump, a lifting control valve, a lifting cylinder one, and a lifting cylinder two. The cylinder seats of the lifting cylinder one and the lifting cylinder two are respectively connected to a pair of lifting supports (1209), and the piston rods are respectively connected to the left and right sides of the cargo box (52). The hydraulic steering subsystem includes an electric steering pump, a left steering cylinder, and a right steering cylinder. The cylinder seats of the left steering cylinder and the right steering cylinder are respectively set on the left steering cylinder support and the right steering cylinder support of the front axle (20), and the piston rods are respectively connected to the left steering knuckle arm and the right steering knuckle arm of the front axle (20).

14. The pure electric off-highway dump truck according to claim 11, characterized in that, The hydraulic braking system includes a brake hydraulic oil tank, an electric brake pump, a dual-circuit filling valve, a front axle accumulator, a middle and rear axle accumulator, and a parking brake mechanism. The parking brake mechanism includes a parking brake valve assembly, a front axle service brake, a middle and rear axle service brake, and a parking brake.

15. The pure electric off-highway dump truck according to claim 11, characterized in that, The control system includes a vehicle controller. The vehicle controller forms a first communication link with the transmission controller, the multi-function controller (35), and the single main drive controller (37) via a CAN bus. The vehicle controller forms a second communication link with the smart terminal, instrument panel, gear shift lever, battery swapping system, ATS cooling system, and air conditioning system (47) via a CAN bus. The vehicle controller forms a third communication link with the debugging interface via a CAN bus. The multi-function controller (35) connects with water pump (33) and drive motor (37). (1301), hydraulic lifting and steering system, hydraulic braking system, 24V battery, air conditioning system (47) are electrically connected. The multi-in-one controller (35) is set above the left front beam (1204) and right front beam (1205) through the multi-in-one controller mounting bracket (36). The single main drive controller (37) is electrically connected to water pump two (34) and drive motor two (1302). The single main drive controller (37) is set in front of a pair of front ring beams (1203) through the single main drive controller mounting bracket (38).

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