Wheel edge driving system of electric mining dump truck

Abstract

A wheel edge driving system of an electric mining dump truck comprises a gearbox and a planet row which is arranged on the periphery of the gearbox and fixed to a driving wheel. The multi-motor input assembly is used for dynamically coupling the three motors, the first gear shifting assembly has a two-gear speed changing function and is connected with the first multi-motor input assembly, the output shaft is used for transmitting power to the planet row, the second gear shifting assembly is assembled on the output shaft, and the output shaft is connected with the input end of the planet row. The output shaft is in transmission connection with the first multi-motor input assembly along with gear shifting of the second gear shifting assembly or is in transmission connection with the first gear shifting assembly along with gear shifting of the first gear shifting assembly. According to the utility model, not only is the adaptability to complex terrains improved, but also the power requirements of various working conditions are considered, the switching between a low-speed large-torque mode and a high-speed energy-saving mode is realized, and the optimal matching between the dynamic property and the economical efficiency of the whole vehicle is achieved.

Description

Technical Field

[0001] This utility model relates to an electric mining dump truck wheel-side drive system, belonging to the field of mining vehicle wheel-side drive technology. Background Technology

[0002] Pure electric mining dump trucks offer unparalleled advantages over traditional dump trucks, including high energy efficiency, lower exhaust emissions, flexible operation, high instantaneous torque, and low transportation and maintenance costs. This is of significant practical importance in promoting the development of open-pit mine transport vehicles towards high efficiency, energy conservation, and environmental friendliness. The complex operating conditions of mining dump trucks, such as extreme heavy loads, frequent starts and stops, and braking on long slopes, place stringent demands on the power transmission system. It must withstand extremely high torque while ensuring high reliability and energy feedback efficiency. Current mining vehicle drive systems generally employ central drive systems and wheel-side drive systems. Central drive systems, limited by the transmission chain capacity, cannot meet the torque requirements of large-tonnage mining dump trucks. Power is transmitted to the wheel ends via the differential to the half-shafts. However, heavy trucks have high power and climbing requirements, and mechanical differentials cannot independently distribute torque to the left and right wheels, affecting the vehicle's passability, reducing overall safety, and hindering the improvement of overall handling stability. Compared to a central drive system, a wheel-side drive system can fully leverage its own configuration advantages and the control function of the overall controller to achieve a wide range of power torque distribution without additional energy consumption. The drive torque of each drive wheel can be individually controlled and actively adjusted according to the operating status of the mining vehicle and road conditions, forming an electronic differential. This makes it easier to improve the traction performance and operational adaptability of the entire machine. However, in a single-motor wheel-side drive, the single motor needs to consider too many working conditions. A single motor drive cannot meet the high torque power output requirements under heavy loads. It is necessary to use a single high-torque, low-speed drive motor, combined with a fixed-ratio reduction gear. This will lead to problems such as large weight, high manufacturing cost, and insufficient power performance at medium and high speeds. On the other hand, the power confluence structure of a multi-motor drive is complex, and all drive motors are matched with reducers. The motor and reduction gearbox are integrated to the wheel end, resulting in low system matching adaptability and failing to achieve the best match between the overall vehicle power and economy. Utility Model Content

[0003] The electric mining dump truck wheel-side drive system provided by this utility model couples the power of three motors to achieve power redundancy, reduce the risk of gearbox failure, not only improves the adaptability to complex terrain, but also takes into account the power requirements of various working conditions, realizes the switching between low-speed high torque and high-speed energy-saving modes, and achieves the best match between the power and economy of the whole vehicle.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An electric mining dump truck wheel-side drive system includes a gearbox and a planetary gear set disposed on the outer periphery of the gearbox and fixed to the drive wheel. The gearbox comprises three motors, a multi-motor input assembly that power-couples the three motors, a shift assembly one with two-speed transmission function connected to the multi-motor input assembly one, an output shaft that transmits power to the planetary gear set, and a shift assembly two mounted on the output shaft. The output shaft is connected to the input end of the planetary gear set. The output shaft forms a transmission connection with the multi-motor input assembly one as the shift assembly two shifts, or forms a transmission connection with the shift assembly one as the shift assembly one shifts.

[0006] Preferably, the three motors are motor one, motor two, and motor three. The multi-motor input assembly includes an input gear shaft fixed to the output ends of motor one and motor three, a constant mesh gear shaft fixed to the output end of motor two and located between the two input gear shafts, a constant mesh gear one coaxially fixed on the constant mesh gear shaft and meshing with the input gear shaft, and a shift assembly two installed between the constant mesh gear shaft and the output shaft.

[0007] Preferably, a second constant mesh gear with an outer diameter smaller than that of the first constant mesh gear is coaxially fixed on the constant mesh gear shaft, and the second constant mesh gear meshes with the first shift assembly.

[0008] Preferably, the shift assembly includes an intermediate shaft symmetrically arranged on both sides of the constant mesh gear two, a constant mesh driven gear coaxially fixed on the intermediate shaft and meshing with the constant mesh gear two, a shift gear coaxially fixed on the intermediate shaft, a shift sleeve axially slidable on the shift gear, a first gear drive gear rotatably mounted on the right side of the shift gear, and a second gear drive gear rotatably mounted on the left side of the shift gear. The outer diameter of the second gear drive gear is larger than the outer diameter of the first gear drive gear. The shift sleeve moves to the right to engage with the first gear drive gear and moves to the left to engage with the second gear drive gear.

[0009] Preferably, a first-gear driven gear meshing with a first-gear drive gear and a second-gear driven gear meshing with a second-gear drive gear are coaxially fixed on the output shaft.

[0010] Preferably, the constant mesh gear shaft is coaxially aligned with the output shaft, and a direct drive gear is coaxially fixed on the constant mesh gear shaft. The shift assembly two includes a switching gear coaxially fixed on the output shaft and a switching sleeve axially slidable on the switching gear. The switching sleeve moves to the left and engages with the direct drive gear.

[0011] Preferably, the planetary gear set is a two-stage planetary gear set, including a first-stage sun gear fixed coaxially with the output shaft, a first-stage planet gear meshing with the first-stage sun gear, a first-stage planet carrier cooperating with the first-stage planet gear, a first-stage ring gear meshing on the outer circumference of the first-stage planet gear, a second-stage sun gear fixed coaxially with the first-stage planet carrier, a second-stage planet gear meshing with the second-stage sun gear, a second-stage planet carrier cooperating with the second-stage planet gear, and a second-stage ring gear meshing on the outer circumference of the second-stage planet gear. The first-stage ring gear is rotatably supported on the first-stage planet carrier by bearings. The second-stage planet carrier is fixed to the gearbox housing. The first-stage ring gear and the second-stage ring gear are coaxially fixed. The second-stage ring gear is supported on the outer circumference of the second-stage planet carrier by bearings and is coaxially fixed with the drive wheel.

[0012] The beneficial effects of the utility model are:

[0013] This utility model discloses an electric mining dump truck wheel-side drive system that integrates a gearbox and planetary gear set to the wheel end. The multi-motor input component in the gearbox couples the power of three motors. Initially, both shift components one and two are in neutral, and the output shaft is not connected to either shift component one or the multi-motor input component. When shift component one engages gear and connects to the output shaft, the power of the three motors is transmitted to the planetary gear set via the multi-motor input component, shift component one, and the output shaft. The planetary gear set then reduces the speed and drives the drive wheel, creating a low-speed, high-torque drive. This increases the power density of the drive wheel torque, overcomes the power density limitation of a single motor, meets the high-torque power output requirements under heavy loads, and adapts to the heavy-load working conditions of mining dump trucks. When shift component two engages gear, the multi-motor input... The components form a transmission connection with the output shaft. The power of the three motors is directly transmitted to the output shaft through the multi-motor input component, and then reduced by the planetary gear set to drive the drive wheels, forming a high-speed energy-saving mode. This mode is suitable for the light-load working conditions of mining dump trucks. The three motors are coupled to achieve power redundancy and reduce the risk of gearbox failure. It can also switch between single-motor, dual-motor, and three-motor drive modes according to the load drive requirements of the mining dump truck. Combined with the high-efficiency range and dynamic distribution of the motors, the drive torque of each drive wheel can be individually controlled and actively adjusted according to the operating status of the mining vehicle and the road conditions. This not only improves the adaptability to complex terrain, but also takes into account the power requirements of various working conditions, realizing the switching between low-speed high torque and high-speed energy-saving modes, and achieving the best match between the vehicle's power and economy. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the transmission of the wheel-side drive system of the electric mining dump truck of this utility model.

[0015] Figure 2 A schematic diagram of the transmission of the wheel-side drive system for an electric mining dump truck when forming a first-gear power.

[0016] Figure 3A schematic diagram of the transmission of the wheel-side drive system for an electric mining dump truck when generating second-gear power.

[0017] Figure 4 A schematic diagram of the transmission of the wheel-side drive system for an electric mining dump truck when three power levels are achieved. Detailed Implementation

[0018] The following is combined Figures 1-4 The embodiments of this utility model will be described in detail below.

[0019] An electric mining dump truck wheel-side drive system includes a gearbox and a planetary gear set 5 disposed on the outer periphery of the gearbox and fixed to the drive wheel. The gearbox comprises three motors, a multi-motor input assembly 1 that power-couples the three motors, a shift assembly 2 with two-speed shifting function connected to the multi-motor input assembly 1, an output shaft 3 that transmits power to the planetary gear set 5, and a shift assembly 2 4 mounted on the output shaft 3. The output shaft 3 is connected to the input end of the planetary gear set 5. The output shaft 3 forms a transmission connection with the multi-motor input assembly 1 when shifting gears with the shift assembly 2 4, or forms a transmission connection with the shift assembly 2 when shifting gears with the shift assembly 2 2.

[0020] The electric mining dump truck wheel-side drive system described above integrates the gearbox and planetary gear set 5 to the wheel end. The multi-motor input component 1 in the gearbox couples the power of the three motors. In the initial state, both shift component 1 2 and shift component 2 4 are in neutral, and the output shaft 3 does not form a transmission connection with shift component 1 2 or multi-motor input component 1. When shift component 1 2 is engaged and forms a transmission connection with the output shaft 3, the power of the three motors is transmitted to the planetary gear set through multi-motor input component 1, shift component 1 2, and output shaft 3. The planetary gear set 5 then reduces the speed and drives the drive wheel 100, forming a low-speed, high-torque drive. This increases the power density of the drive wheel torque, breaks through the power density limitation of a single motor, meets the high-torque power output requirements under heavy loads, and adapts to the heavy-load working conditions of mining dump trucks. When shift component 2 4 is engaged, the power of the three motors is transmitted to the planetary gear set through multi-motor input component 1, shift component 1 2, and output shaft 3. The power is then reduced by the planetary gear set 5 and drives the drive wheel 100, forming a low-speed, high-torque drive. This improves the power density of the drive wheel torque, breaks through the power density limitation of a single motor, meets the high-torque power output requirements under heavy loads, and adapts to the heavy-load working conditions of mining dump trucks. When shift component 2 4 is engaged, the power of the three motors is transmitted to the planetary gear set through multi-motor input component 1, shift component 2 2, and output shaft 3. The motor input component 1 and the output shaft 3 form a transmission connection. The power of the three motors is directly transmitted to the output shaft 3 through the multi-motor input component 1, and then reduced by the planetary gear set 5 to drive the drive wheel 100, forming a high-speed energy-saving mode. This mode is suitable for the light-load working conditions of mining dump trucks. The three motors are coupled to achieve power redundancy and reduce the risk of gearbox failure. It can also switch between single-motor, dual-motor, and three-motor drive modes according to the load drive requirements of the mining dump truck. Combined with the high-efficiency range and dynamic distribution of the motors, the drive torque of each drive wheel can be individually controlled and actively adjusted according to the operating status of the mining vehicle and the road conditions. This not only improves the adaptability to complex terrain, but also takes into account the power requirements of various working conditions, realizing the switching between low-speed high torque and high-speed energy-saving modes, and achieving the best match between the power and economy of the whole vehicle.

[0021] The three motors are motor 6, motor 7, and motor 8. The multi-motor input assembly 1 includes an input gear shaft 9 fixed to the output ends of motor 6 and motor 8, a constant mesh gear shaft 10 fixed to the output end of motor 7 and located between the two input gear shafts 9, and a constant mesh gear 11 coaxially fixed on the constant mesh gear shaft 10 and meshing with the input gear shaft 9. The shift assembly 2 4 is installed between the constant mesh gear shaft 10 and the output shaft 3. The constant mesh gear shaft 10 meshes with the input gear shaft 9, coupling the power of the three motors to the constant mesh gear shaft 10. The initial state of both shift assembly 2 and shift assembly 3 is in neutral. At this time, the output shaft 3 does not form a transmission connection with the constant mesh gear shaft 10 and shift assembly 3. If shift assembly 4 shifts gears, a transmission connection will be formed between the constant mesh gear shaft 10 and the output shaft 3, so that the movement of the constant mesh gear shaft 10 is directly transmitted to the output shaft 3. Alternatively, if shift assembly 3 shifts gears, a transmission connection will be formed between shift assembly 3 and the output shaft 3, so that the movement of the constant mesh gear shaft 10 is transmitted to the output shaft 3 via shift assembly 3.

[0022] In this configuration, a second constant mesh gear 12, with an outer diameter smaller than that of the first constant mesh gear 11, is coaxially fixed on the constant mesh gear shaft 10. The second constant mesh gear 12 meshes with the shift assembly 2. The second constant mesh gear 12 transmits the power from the constant mesh gear shaft 10 to the shift assembly 2. After the shift assembly 2 shifts gears, it forms a transmission connection with the output shaft, transmitting the power to the output shaft 3.

[0023] The shift assembly 2 includes an intermediate shaft 13 symmetrically arranged on both sides of the constant mesh gear 12, a constant mesh driven gear 14 coaxially fixed on the intermediate shaft 13 and meshing with the constant mesh gear 12, a shift gear 15 coaxially fixed on the intermediate shaft 13, a shift sleeve 16 axially slidably mounted on the shift gear 15, a first gear drive gear 17 rotatably mounted on the right side of the shift gear 15, and a second gear drive gear 18 rotatably mounted on the left side of the shift gear 15. The outer diameter of the second gear drive gear 18 is larger than the outer diameter of the first gear drive gear 17. The shift sleeve 16 moves to the right to engage with the first gear drive gear 17 and moves to the left to engage with the second gear drive gear 18. Two intermediate shafts 13 are symmetrically arranged on both sides of the constant mesh gear 12. The shift gear 15 is fixed to the intermediate shaft 13. The first gear drive gear 17 and the second gear drive gear 18 are rotatably mounted on the intermediate shaft 13. When the shift sleeve 16 is not engaged with either the first gear drive gear 17 or the second gear drive gear 18, it is in neutral. At this time, the power of the constant mesh gear 12 can only be transmitted to the intermediate shaft 13 and cannot be transmitted to the output shaft 3. The shift assembly 2 and the output shaft 3 do not form a transmission connection. When the shift sleeve 16 is engaged with either the first gear drive gear 17 or the second gear drive gear 18, the power of the constant mesh gear 12 is transmitted to the intermediate shaft 13, and then transmitted through the shift gear 15 and the shift sleeve 16 to the intermediate shaft 13. The first gear drive gear 17 or the second gear drive gear 18 is used to transmit power to the output shaft 3, forming a transmission connection between the shift assembly 12 and the output shaft 3. The power of the constant mesh gear shaft 10 is transmitted to the output shaft 3 through the shift assembly 2. At this time, the output shaft 3 has a low speed and a high torque, which is suitable for high torque drive requirements. The shift sleeve 16 is used to combine with the first gear drive gear or the second gear drive gear 18 to form two different torques and speeds on the output shaft. When the shift sleeve 16 is combined with the second gear drive gear 18, it meets the high torque requirements under heavy load conditions. When the shift sleeve is combined with the first gear drive gear 17, it meets the ultra-high torque requirements under extreme heavy load conditions. When shift assembly 12 is in gear and shift assembly 24 is in neutral, shift assembly 12 forms a transmission connection with output shaft 3 to transmit motor power. When shift assembly 12 is in neutral and shift assembly 24 is in gear, multi-motor output stage 1 directly forms a transmission connection with output shaft 3 to transmit motor power. Shift assembly 12 and shift assembly 24 cannot be in gear at the same time.

[0024] The output shaft 3 has a first-gear driven gear 19 that meshes with the first-gear drive gear 17 and a second-gear driven gear 20 that meshes with the second-gear drive gear 18, both coaxially fixed to the shaft. When the shift sleeve 16 engages with the first-gear drive gear 17, the first-gear drive gear 17 drives the first-gear driven gear 19 to rotate, thereby driving the output shaft 3 to rotate. The output shaft 3 then transmits power to the planetary gear set 5. When the shift sleeve 16 engages with the second-gear drive gear 18, the second-gear drive gear 18 drives the second-gear driven gear 20 to rotate, thereby driving the output shaft 3 to rotate. The output shaft 3 then transmits power to the planetary gear set 5.

[0025] The constant mesh gear shaft 10 is coaxially aligned with the output shaft 3. A direct drive gear 21 is coaxially fixed on the constant mesh gear shaft 10. The shift assembly 4 includes a switching gear 22 coaxially fixed on the output shaft 3 and a switching sleeve 23 axially slidable on the switching gear 22. The switching sleeve 23 moves to the left and engages with the direct drive gear 21. The switching gear 22 is fixed on the output shaft 3. When the switching sleeve 23 is in the neutral position, it does not engage with the direct drive gear 21, and the constant mesh gear shaft 10 and the output shaft 3 do not form a transmission connection. When the switching sleeve 23 moves to the left and engages with the direct drive gear 21, the constant mesh gear shaft 10 and the output shaft 3 form a transmission connection. At this time, the shift sleeve 16 should be in the neutral position, and the power of the constant mesh gear shaft 10 is directly transmitted to the output shaft 3. At this time, the power speed of the output shaft 3 is higher and the torque is lower, which is suitable for high-speed, low-torque drive under light load conditions.

[0026] The planetary gear set is a two-stage planetary gear set, including a primary sun gear 24 fixed coaxially with the output shaft 3, a primary planet gear 25 meshing with the primary sun gear 24, a primary planet carrier 26 cooperating with the primary planet gear 25, a primary ring gear 27 meshing on the outer periphery of the primary planet gear 25, a secondary sun gear 28 fixed coaxially with the primary planet carrier 26, a secondary planet gear 29 meshing with the secondary sun gear 28, a secondary planet carrier 30 cooperating with the secondary planet gear 29, and a secondary ring gear 31 meshing on the outer periphery of the secondary planet gear 29. The primary ring gear 27 is rotatably supported on the primary planet carrier 26 by bearings. The secondary planet carrier 30 is fixed to the gearbox housing. The primary ring gear 27 and the secondary ring gear 31 are coaxially fixed. The secondary ring gear 31 is supported on the outer periphery of the secondary planet carrier 30 by bearings and is coaxially fixed with the drive wheel 100. Output shaft 3 drives the first-stage sun gear 24, first-stage planetary gears 25, and first-stage planetary carrier 26 to rotate. Second-stage sun gear 27 rotates synchronously with the first-stage planetary carrier 26, driving the second-stage planetary gear 29 to rotate. Since the second-stage planetary carrier 30 is fixed to the gearbox housing and cannot rotate, the second-stage planetary gear 25 drives the second-stage ring gear 31 and the first-stage ring gear 27 to rotate together, causing the drive wheel 100 to rotate. This design uses a two-stage planetary gear set for speed reduction, utilizing the high speed ratio of the planetary gear set to achieve high-ratio speed reduction and torque increase, effectively improving the drive torque of the drive wheel. When output shaft 3 is connected to shift assembly 2, the power from output shaft 3 is reduced by the two-stage planetary gear set to generate high torque power to drive the drive wheel, meeting the torque requirements under heavy-load conditions. When output shaft 3 is connected to multiple motors... When the input component 1 forms a transmission connection, the power of the output shaft 3 is reduced by the secondary planetary gear set to form a power with a certain torque to drive the drive wheel. This avoids the reduction of vehicle road condition adaptability due to the low power torque formed by the direct transmission connection between the multi-motor input shaft component 1 and the output shaft 3. It allows the drive wheel to meet the output requirements of both speed and torque, improving the vehicle's adaptability to complex road conditions. The secondary planetary carrier 30 is fixed to the gearbox housing, and the secondary gear ring 31 is supported on the outer periphery of the secondary planetary carrier 30 by bearings, ensuring the reliability of the support of the secondary gear ring 31. This forms a wheel-side drive system that is coaxially aligned with the wheel, effectively reducing the axial dimension of the wheel-side drive system. By utilizing the compact structural characteristics of the planetary gear set, the volume of the entire wheel-side drive system is reduced, and the requirements of the wheel-side drive assembly for wheel-side installation space are lowered.

[0027] The gear shifting drive method of the electric mining dump truck wheel-side drive system described above, in which gear shifting component one and gear shifting component two are initially in the neutral position;

[0028] When shift assembly 2 is in neutral, shift assembly 1 is engaged in low gear. Output shaft 3 and shift assembly 1 form a transmission connection. The power of multi-motor input assembly 1 is transmitted to output shaft 3 through shift assembly 1, and then reduced by planetary gear set 5 and drives drive wheel to form first gear power.

[0029] When shift assembly 2 is in neutral, shift assembly 1 is engaged in high gear. Output shaft 3 and shift assembly 1 form a transmission connection. The power of multi-motor input assembly 1 is transmitted to output shaft 3 through shift assembly 1, and then reduced by planetary gear set 5 and drives drive wheel to form second gear power.

[0030] When shift assembly 1 is in neutral, shift assembly 2 is engaged. Multi-motor input assembly 1 and output shaft 3 form a transmission connection. The power of multi-motor input assembly 1 is directly transmitted to output shaft 4, and then reduced by planetary gear set 5 to drive the drive wheel to form three-speed power.

[0031] "Shifting component 2 to gear 4" means that the shift sleeve 23 moves to the left and engages with the direct drive gear 21, forming a connection between the constant mesh gear shaft 10 and the output shaft 3, so that the multi-motor input component 1 and the output shaft 3 form a transmission connection, and the constant mesh gear shaft 10 directly transmits power to the output shaft 3; "Shifting component 1 to low gear" means that the shift sleeve 16 moves to the right and engages with the first gear drive gear 17; "Shifting component 1 to high gear" means that the shift sleeve 16 moves to the left and engages with the second gear drive gear 18. When the shift sleeve 16 engages with the first gear drive gear 17 or the second gear drive gear 18, the power of the constant mesh gear 12 is transmitted to the intermediate shaft 13, and then to the first gear drive gear 17 or the second gear drive gear 18 through the shift gear 15 and the shift sleeve 16. Finally, it is transmitted to the output shaft 3 through the first gear drive gear 17 or the second gear drive gear 18, forming a transmission connection between the shift assembly 2 and the output shaft 3. The power of the constant mesh gear shaft 10 is transmitted to the output shaft 3 through the shift assembly 2. At this time, the output shaft speed is low and the torque is high, which is suitable for high torque drive requirements. The engagement of the shift sleeve 16 with the first gear drive gear 18 creates two different torques and speeds on the output shaft. When the shift sleeve 16 engages with the second gear drive gear 18, it meets the high torque requirements under heavy load conditions. When the shift sleeve 16 engages with the first gear drive gear 17, it meets the ultra-high torque requirements under extreme heavy load conditions.

[0032] The technical solutions of the embodiments of this utility model have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. An electric mining dump truck wheel-side drive system, comprising a gearbox and a planetary gear set disposed on the outer periphery of the gearbox and fixed to the drive wheel, characterized in that: The gearbox includes three motors, a multi-motor input assembly that power couples the three motors, a shift assembly one with two-speed shifting function and connected to the multi-motor input assembly one, an output shaft that transmits power to the planetary gear set, and a shift assembly two mounted on the output shaft. The output shaft is connected to the input end of the planetary gear set. The output shaft forms a transmission connection with the multi-motor input assembly one as the shift assembly two shifts, or forms a transmission connection with the shift assembly one as the shift assembly one shifts.

2. The electric mining dump truck wheel-side drive system according to claim 1, characterized in that: The three motors are motor one, motor two and motor three. The multi-motor input assembly includes an input gear shaft fixed to the output ends of motor one and motor three respectively, a constant mesh gear shaft fixed to the output end of motor two and located between the two input gear shafts, a constant mesh gear one coaxially fixed on the constant mesh gear shaft and meshing with the input gear shaft, and a shift assembly two installed between the constant mesh gear shaft and the output shaft.

3. The electric mining dump truck wheel-side drive system according to claim 2, characterized in that: A second constant mesh gear, with an outer diameter smaller than that of the first constant mesh gear, is coaxially fixed on the constant mesh gear shaft. The second constant mesh gear meshes with the first shift assembly.

4. The electric mining dump truck wheel-side drive system according to claim 3, characterized in that: The shifting assembly includes an intermediate shaft symmetrically arranged on both sides of the constant mesh gear two, a constant mesh driven gear coaxially fixed on the intermediate shaft and meshing with the constant mesh gear two, a shifting gear coaxially fixed on the intermediate shaft, a shifting sleeve axially slidable on the shifting gear, a first gear driving gear rotatably mounted on the right side of the shifting gear, and a second gear driving gear rotatably mounted on the left side of the shifting gear. The outer diameter of the second gear driving gear is larger than the outer diameter of the first gear driving gear. The shifting sleeve moves to the right to engage with the first gear driving gear and moves to the left to engage with the second gear driving gear.

5. The electric mining dump truck wheel-side drive system according to claim 4, characterized in that: The output shaft is coaxially fixed with a first-gear driven gear that meshes with the first-gear driving gear and a second-gear driven gear that meshes with the second-gear driving gear.

6. The electric mining dump truck wheel-side drive system according to claim 2, characterized in that: The constant mesh gear shaft is coaxially aligned with the output shaft, and a direct drive gear is coaxially fixed on the constant mesh gear shaft. The shift assembly two includes a switching gear coaxially fixed on the output shaft and a switching sleeve axially slidable on the switching gear. The switching sleeve moves to the left and engages with the direct drive gear.

7. The electric mining dump truck wheel-side drive system according to claim 1, characterized in that: The planetary gear set is a two-stage planetary gear set, including a first-stage sun gear fixed coaxially with the output shaft, first-stage planet gears meshing with the first-stage sun gear, a first-stage planet carrier cooperating with the first-stage planet gears, a first-stage ring gear meshing on the outer circumference of the first-stage planet gears, a second-stage sun gear fixed coaxially with the first-stage planet carrier, second-stage planet gears meshing with the second-stage sun gear, a second-stage planet carrier cooperating with the second-stage planet gears, and a second-stage ring gear meshing on the outer circumference of the second-stage planet gears. The first-stage ring gear is rotatably supported on the first-stage planet carrier by bearings. The second-stage planet carrier is fixed to the gearbox housing. The first-stage ring gear and the second-stage ring gear are coaxially fixed. The second-stage ring gear is supported on the outer circumference of the second-stage planet carrier by bearings and is coaxially fixed with the drive wheel.

Images