Electric mining dump truck wheel edge and driving system and gear shifting driving method thereof

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. The complex terrain adaptability is improved, the power requirements of various working conditions are met, switching between a low-speed large torque mode and a high-speed energy-saving mode is achieved, and the optimal matching of the dynamic property and economical efficiency of the whole vehicle is achieved. The invention further provides a gear shifting driving method of the wheel edge driving system of the electric mining dump truck and the electric mining dump truck.

Description

Technical Field

[0001] The present invention relates to a wheel-side drive system for an electric mining dump truck, belonging to the technical field of wheel-side drive for mining vehicles. The present invention also relates to a shifting drive method for an electric mining dump truck wheel-side drive system and an electric mining dump truck. Background Art

[0002] Pure electric mining dump trucks have high energy efficiency, low exhaust pollution, flexible operation, high instantaneous torque, low transportation costs and maintenance costs, and have advantages that cannot be compared with traditional dump trucks. It has important practical significance for promoting the development of open-pit mining transport vehicles towards high efficiency, energy conservation, green and environmental protection. The extreme heavy load, frequent start-stop, long slope braking and other complex working conditions of mining dump trucks pose severe requirements on the power transmission system. It is necessary to bear ultra-large torque and ensure high reliability and energy feedback efficiency. The drive systems of mining vehicles in the prior art generally adopt a central drive system and a wheel-side drive system. The central drive system is limited by the transmission chain capacity, and the torque cannot meet the requirements of large-tonnage mining dump trucks. The power is output to the wheel end through the differential to the half shaft. However, heavy trucks have high power and climbing requirements, and the mechanical differential cannot independently distribute the torque of the left and right wheels, which will affect the passing performance of the whole vehicle, reduce the safety of the whole vehicle, and is not conducive to the improvement of the handling stability of the whole vehicle. Compared with the central drive system, the wheel-side drive system can give full play to its own configuration advantages and the control function of the whole vehicle controller, and realize a wide range of power torque distribution without additional energy consumption. The drive torque of each drive wheel can be independently controlled and actively adjusted according to the operating state of the mining vehicle and the road surface conditions to form an electronic differential, which is more conducive to enhancing the potential advantages of the traction performance and operation adaptability of the whole machine; but in the single-motor wheel-side drive, the single motor needs to take into account too many working conditions, and a single motor drive cannot meet the large-torque power output requirements under heavy loads. It is necessary to use a single large-torque, low-speed drive motor, combined with a fixed-ratio reduction device, which will lead to problems such as large weight of the electric drive system, high manufacturing cost, and insufficient power performance at medium and high speeds. The power confluence structure of the multi-motor drive is complex, and all use drive motors to match reducers. The motor and the reduction box are integrated to the wheel end, and the system matching adaptability is not high, and the best match between the power performance and economy of the whole vehicle cannot be achieved. Summary of the Invention

[0003] The wheel-side drive system for an electric mining dump truck provided by the present invention couples the power of three motors to achieve power redundancy, reduce the risk of gearbox failure, not only improve the adaptability to complex terrains, but also take into account the power requirements of various working conditions, realize the switching between low-speed large-torque and high-speed energy-saving modes, and achieve the best match between the power performance and economy of the whole vehicle. The present invention also provides a shifting drive method for an electric mining dump truck wheel-side drive system and an electric mining dump truck.

[0004] To achieve the above object, the technical solution adopted by the present invention is: The electric wheel side drive system for mining dump trucks includes a gearbox and a planetary gear set arranged on the outer periphery of the gearbox and fixed to the drive wheel. It is characterized in that: the gearbox includes three motors, a multi-motor input component for coupling the power of the three motors, a first shifting component with two-speed shifting function and connected to the multi-motor input component, an output shaft for transmitting power to the planetary gear set, and a second shifting component assembled on the output shaft. The output shaft is connected to the input end of the planetary gear set, and the output shaft forms a transmission connection with the multi-motor input component with the shifting of the second shifting component, or forms a transmission connection with the first shifting component with the shifting of the first shifting component.

[0005] Preferably, the three motors are respectively a first motor, a second motor and a third motor. The multi-motor input component includes input gear shafts respectively fixed to the output ends of the first motor and the third motor, a constantly meshing gear shaft fixed to the output end of the second motor and located between the two input gear shafts, and a first constantly meshing gear coaxially fixed on the constantly meshing gear shaft and meshing with the input gear shafts. The second shifting component is installed between the constantly meshing gear shaft and the output shaft.

[0006] Preferably, a second constantly meshing gear with an outer diameter smaller than that of the first constantly meshing gear is coaxially fixed on the constantly meshing gear shaft, and the second constantly meshing gear meshes with the first shifting component.

[0007] Preferably, the first shifting component includes intermediate shafts symmetrically arranged on both sides of the second constantly meshing gear, a constantly meshing passive gear coaxially fixed on the intermediate shaft and meshing with the second constantly meshing gear, a shifting gear coaxially fixed on the intermediate shaft, a shifting sleeve axially slidably assembled on the shifting gear, a first gear driving gear rotatably installed on the right side of the shifting gear, and a second gear driving gear rotatably installed on the left side of the shifting gear. The outer diameter of the second gear driving gear is larger than that 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.

[0008] Preferably, a first gear driven gear meshing with the first gear driving gear and a second gear driven gear meshing with the second gear driving gear are coaxially fixed on the output shaft.

[0009] Preferably, the constantly meshing gear shaft is coaxially aligned with the output shaft. A direct drive gear is coaxially fixed on the constantly meshing gear shaft. The second shifting component includes a switching gear coaxially fixed on the output shaft and a switching sleeve axially slidably assembled on the switching gear. The switching sleeve moves to the left to engage with the direct drive gear.

[0010] Preferably, the planetary gear set is a two-stage planetary gear set, including a first-stage sun gear coaxially fixed to the output shaft, a first-stage planetary gear meshing with the first-stage sun gear, a first-stage planetary carrier cooperating with the first-stage planetary gear, and a first-stage ring gear meshing on the outer periphery of the first-stage planetary gear, a second-stage sun gear coaxially fixed to the first-stage planetary carrier, a second-stage planetary gear meshing with the second-stage sun gear, a second-stage planetary carrier cooperating with the second-stage planetary gear, and a second-stage ring gear meshing on the outer periphery of the second-stage planetary gear. The first-stage ring gear is rotatably supported on the first-stage planetary carrier through a bearing. The second-stage planetary carrier is fixed to the housing of the transmission. The first-stage ring gear and the second-stage ring gear are coaxially fixed. The second-stage ring gear is supported on the outer periphery of the second-stage planetary carrier through a bearing and is coaxially fixed to the drive wheel.

[0011] An electric mining dump truck, with a wheel-side drive system integrated on the drive wheel, is characterized in that: the wheel-side drive system is the wheel-side drive system of the above-mentioned electric mining dump truck.

[0012] For the shift drive method of the wheel-side drive system of the above-mentioned electric mining dump truck, the first shift component and the second shift component are initially in the neutral position, and it is characterized in that: When the second shift component is in the neutral position, shift the first shift component to the low gear. The output shaft forms a transmission connection with the first shift component. The power of the multi-motor input component is transmitted to the output shaft through the first shift component, and then decelerated by the planetary gear set and drives the drive wheel to form the first gear power. When the second shift component is in the neutral position, shift the first shift component to the high gear. The output shaft forms a transmission connection with the first shift component. The power of the multi-motor input component is transmitted to the output shaft through the first shift component, and then decelerated by the planetary gear set and drives the drive wheel to form the second gear power. When the first shift component is in the neutral position, shift gears with the second shift component. The multi-motor input component forms a transmission connection with the output shaft. The power of the multi-motor input component is directly driven and transmitted to the output shaft, and then decelerated by the planetary gear set and drives the drive wheel to form the third gear power.

[0013] Preferably, "shifting gears with the second shift component" means that the shift sleeve moves to the left to engage with the direct drive gear; "shifting the first shift component to the low gear" means that the shift sleeve moves to the right to engage with the first gear driving gear; "shifting the first shift component to the high gear" means that the shift sleeve moves to the left to engage with the second gear driving gear.

[0014] The beneficial effects of the invention are: The wheel-end drive system of the electric mining dump truck of the present invention integrates the gearbox and the planetary gear set at the wheel end. The multi-motor input component in the gearbox couples the power of three motors. In the initial state, both the first shifting component and the second shifting component are in the neutral position, and the output shaft is not in transmission connection with the first shifting component and the multi-motor input component. When the first shifting component engages a gear and forms a transmission connection with the output shaft, the power of the three motors is transmitted to the planetary gear set through the multi-motor input component, the first shifting component, and the output shaft, and is decelerated by the planetary gear set and drives the driving wheel to move, forming a low-speed and high-torque drive, improving the power density of the driving torque, breaking through the single-motor power density limit, meeting the large-torque power output demand under heavy loads, and adapting to the heavy-load working conditions of mining dump trucks. When the second shifting component engages a gear, the multi-motor input component forms a transmission connection with the output shaft, and the power of the three motors is directly transmitted to the output shaft through the multi-motor input component, and then is decelerated by the planetary gear set and drives the driving wheel to move, forming a high-speed and energy-saving mode, adapting to the light-load working conditions of mining dump trucks. The power of the three motors is 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 mining dump trucks. Combining the high-efficiency area of the motor and dynamic distribution, the driving torque of each driving wheel can be independently controlled and actively adjusted according to the operating state of the mining vehicle and the road conditions, not only improving the adaptability to complex terrains, but also taking into account the power requirements of various working conditions, realizing the switching between low-speed and high-torque and high-speed and energy-saving modes, and achieving the best matching of the vehicle's power performance and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a transmission schematic diagram of the wheel-end drive system of the electric mining dump truck of the present invention.

[0016] Figure 2 FIG. is a transmission schematic diagram of the wheel-end drive system of the electric mining dump truck when forming the first-gear power.

[0017] Figure 3 FIG. is a transmission schematic diagram of the wheel-end drive system of the electric mining dump truck when forming the second-gear power.

[0018] Figure 4 FIG. is a transmission schematic diagram of the wheel-end drive system of the electric mining dump truck when forming the third-gear power. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will Figures 1 to 4 make a detailed description of the embodiments of the present invention.

[0020] Electric mine dump truck wheel side drive system, including a gearbox and a planetary gear set 5 arranged 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 component 1 for coupling the power of the three motors, a first shift component 2 with two-speed shifting function and connected to the multi-motor input component, an output shaft 3 for transmitting power to the planetary gear set 5 and a second shift component 4 assembled 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 component 1 along with the shifting of the second shift component 4, or forms a transmission connection with the first shift component 2 along with the shifting of the first shift component 2.

[0021] For the above-mentioned electric mine dump truck wheel side drive system, the gearbox and the planetary gear set 5 are integrated into the wheel end. The multi-motor input component 1 in the gearbox couples the power of the three motors. In the initial state, both the first shift component 2 and the second shift component 4 are in the neutral position, and the output shaft 3 does not form a transmission connection with the first shift component 2 and the multi-motor input component 1. When the first shift component 2 engages and forms a transmission connection with the output shaft 3, the power of the three motors is transmitted to the planetary gear set through the multi-motor input component 1, the first shift component 2, and the output shaft 3, and is decelerated by the planetary gear set 5 and drives the drive wheel 100 to move, forming a low-speed high-torque drive, improving the power density of the drive torque, breaking through the single-motor power density limit, meeting the heavy-load large-torque power output requirements, and adapting to the heavy-load working conditions of the mine dump truck. When the second shift component 4 engages, the multi-motor input component 1 forms a transmission connection with the output shaft 3, and the power of the three motors is directly transmitted to the output shaft 3 through the multi-motor input component 1, and then decelerated by the planetary gear set 5 and drives the drive wheel 100 to move, forming a high-speed energy-saving mode, adapting to the light-load working conditions of the mine dump truck. The power of the three motors is coupled to achieve power redundancy and reduce the risk of gearbox failure. It can also switch between single-motor, double-motor, and three-motor drive modes according to the load drive requirements of the mine dump truck. Combining the high-efficiency area of the motor and dynamic distribution, the drive torque of each drive wheel can be individually controlled and actively adjusted according to the operating state of the mine vehicle and road conditions, not only improving the adaptability to complex terrains, but also taking 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 matching of the vehicle's power performance and economy.

[0022] Among them, the three motors are motor one 6, motor two 7, and motor three 8. The multi-motor input assembly 1 includes input gear shafts 9 respectively fixed to the output ends of motor one 6 and motor three 8, a constant-mesh gear shaft 10 fixed to the output end of motor two 7 and located between the two input gear shafts 9, and a constant-mesh gear one 11 coaxially fixed on the constant-mesh gear shaft 10 and meshing with the input gear shaft 9. The second shifting assembly 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 to couple the power of the three motors to the constant-mesh gear shaft 10. The initial states of both the second shifting assembly 4 and the first shifting assembly 2 are in the neutral position. At this time, the output shaft 3 is not in a transmission connection with the constant-mesh gear shaft 10 and the first shifting assembly. If the second shifting assembly 4 shifts gears, a transmission connection between the constant-mesh gear shaft 10 and the output shaft 3 will be formed, enabling the movement of the constant-mesh gear shaft 10 to be directly transmitted to the output shaft 3. Or if the first shifting assembly 2 shifts gears, a transmission connection between the first shifting assembly 2 and the output shaft 3 will be formed, enabling the movement of the constant-mesh gear shaft 10 to be transmitted to the output shaft 3 via the first shifting assembly 2.

[0023] Among them, a constant-mesh gear two 12 with an outer diameter smaller than that of the constant-mesh gear one 11 is coaxially fixed on the constant-mesh gear shaft 10. The constant-mesh gear two 12 meshes with the first shifting assembly 2. The constant-mesh gear two 12 transmits the power of the constant-mesh gear shaft 10 to the first shifting assembly 2. After the first shifting assembly 2 shifts gears, a transmission connection with the output shaft is formed to transmit the power to the output shaft 3.

[0024] Among them, the first shifting component 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 shifting gear 15 coaxially fixed on the intermediate shaft 13, a shifting sleeve 16 axially slidably assembled on the shifting gear 15, a first-gear driving gear 17 rotatably installed on the right side of the shifting gear 15, and a second-gear driving gear 18 rotatably installed on the left side of the shifting gear 15. The outer diameter of the second-gear driving gear 18 is larger than that of the first-gear driving gear 17. The shifting sleeve 16 moves to the right to engage with the first-gear driving gear 17 and moves to the left to engage with the second-gear driving gear 18. The two intermediate shafts 13 are symmetrically arranged on both sides of the constant-mesh gear 12. The shifting gear 15 is fixed to the intermediate shaft 13. The first-gear driving gear 17 and the second-gear driving gear 18 are rotatably installed on the intermediate shaft 13. When the shifting sleeve 16 is not engaged with either the first-gear driving gear 17 or the second-gear driving gear 18, it is in the neutral position. 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 first shifting component 2 and the output shaft 3 are not in a transmission connection. When the shifting sleeve 16 is engaged with the first-gear driving gear 17 or the second-gear driving gear 18, the power of the constant-mesh gear 12 is transmitted to the intermediate shaft 13, and then transmitted to the first-gear driving gear 17 or the second-gear driving gear 18 through the shifting gear 15 and the shifting sleeve 16, and then transmitted to the output shaft 3 through the first-gear driving gear 17 or the second-gear driving gear 18, forming a transmission connection between the first shifting component 2 and the output shaft 3. The power of the constant-mesh gear shaft 10 is transmitted to the output shaft 3 through the first shifting component 2. At this time, the output shaft 3 has a low speed and a large torque, which is suitable for large-torque driving requirements. By engaging the shifting sleeve 16 with the first-gear driving gear or the second-gear driving gear 18, two different torques and speeds are formed on the output shaft. When the shifting sleeve 16 is engaged with the second-gear driving gear 18, it meets the large-torque requirements under heavy-load working conditions. When the shifting sleeve is engaged with the first-gear driving gear 17, it meets the ultra-large-torque requirements under extremely heavy-load working conditions. When the first shifting component 2 is in gear and the second shifting component 4 is in the neutral position, the first shifting component 2 and the output shaft 3 form a transmission connection to transmit the motor power. When the first shifting component 2 is in the neutral position and the second shifting component 4 is in gear, the multi-motor output component 1 is directly connected to the output shaft 3 to form a transmission connection to transmit the motor power. The first shifting component 2 and the second shifting component 4 cannot be in gear at the same time.

[0025] Among them, a first-gear driven gear 19 meshing with a first-gear driving gear 17 and a second-gear driven gear 20 meshing with a second-gear driving gear 18 are coaxially fixed on the output shaft 3. When the shifting sleeve 16 is combined with the first-gear driving gear 17, the first-gear driving gear 17 drives the first-gear driven gear 19 to rotate, thereby driving the output shaft 3 to rotate. The output shaft 3 transmits power to the planetary gear set 5. When the shifting gear 16 is combined with the second-gear driving gear 18, the second-gear driving gear 18 drives the second-gear driven gear 20 to rotate, thereby driving the output shaft 3 to rotate. The output shaft 3 transmits power to the planetary gear set 5.

[0026] Among them, 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 second shifting assembly 4 includes a switching gear 22 coaxially fixed on the output shaft 3 and a switching sleeve 23 axially slidably assembled on the switching gear 22. The switching sleeve 23 moves leftward to be combined 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 is not combined 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 leftward to be combined 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 shifting sleeve 16 should be in the neutral position. 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 smaller, which is suitable for high-speed and low-torque driving under light-load conditions.

[0027] Among them, the planetary gear set is a two-stage planetary gear set, including a first-stage sun gear 24 fixedly coaxial with the output shaft 3, a first-stage planetary gear 25 meshing with the first-stage sun gear 24, a first-stage planetary carrier 26 cooperating with the first-stage planetary gear 25, and a first-stage ring gear 27 meshing on the outer periphery of the first-stage planetary gear 25, a second-stage sun gear 28 fixedly coaxial with the first-stage planetary carrier 26, a second-stage planetary gear 29 meshing with the second-stage sun gear 28, a second-stage planetary carrier 30 cooperating with the second-stage planetary gear 29, and a second-stage ring gear 31 meshing on the outer periphery of the second-stage planetary gear 29. The first-stage ring gear 27 is rotatably supported on the first-stage planetary carrier 26 through a bearing. The second-stage planetary carrier 30 is fixed to the housing of the transmission. The first-stage ring gear 27 and the second-stage ring gear 31 are coaxially fixedly connected. The second-stage ring gear 31 is supported on the outer periphery of the second-stage planetary carrier 30 through a bearing and is coaxially fixedly connected with the drive wheel 100. The output shaft 3 drives the first-stage sun gear 24, the first-stage planetary gear 25, and the first-stage planetary carrier 26 to rotate. The second-stage sun gear 27 rotates synchronously with the first-stage planetary carrier 26 and drives the second-stage planetary gear 29 to rotate. Since the second-stage planetary carrier 30 is fixed to the housing of the transmission and cannot rotate, the second-stage planetary gear 25 will drive the second-stage ring gear 31 and the first-stage ring gear 27 to rotate together, causing the drive wheel 100 to rotate. In this solution, a two-stage planetary gear set is used for speed reduction. Utilizing the transmission characteristics of a large planetary gear set speed ratio, a large speed ratio speed reduction and torque increase are formed, which can effectively improve the driving torque of the drive wheel. When the output shaft 3 forms a transmission connection with the first shifting component 2, the power of the output shaft 3 is decelerated by the two-stage planetary gear set to form a high-torque power to drive the drive wheel to operate, meeting the torque requirements under heavy load conditions. When the output shaft 3 forms a transmission connection with the multi-motor input component 1, the power of the output shaft 3 is decelerated by the two-stage planetary gear set to form a power with a certain torque to drive the drive wheel to operate, avoiding the reduction of the vehicle's road condition adaptability due to the too low power torque formed by the direct transmission connection between the multi-motor input shaft component 1 and the output shaft 3, enabling the drive wheel to balance the output requirements of speed and torque, and improving the vehicle's adaptability to complex road conditions. The second-stage planetary carrier 30 is fixed to the housing of the transmission, and the second-stage ring gear 31 is supported on the outer periphery of the second-stage planetary carrier 30 through a bearing, ensuring the support reliability of the second-stage ring gear 31, forming a wheel-side drive system coaxially aligned with the wheel, effectively reducing the axial dimension of the wheel-side drive system and utilizing the compact structure characteristics of the planetary gear set to reduce the volume of the entire wheel-side drive system and reduce the requirements of the wheel-side drive assembly for the wheel-side installation space.

[0028] The present invention also protects an electric mining dump truck with a wheel-side drive system integrated on the drive wheel, characterized in that: the wheel-side drive system is the wheel-side drive system of the above-mentioned electric mining dump truck.

[0029] The above-mentioned electric mining dump truck uses three-motor power coupling to achieve power redundancy, reduce the risk of transmission failure, and can also switch between single-motor, dual-motor, and three-motor drive modes according to the load drive requirements of the mining dump truck. Combining the high-efficiency area of the motor and dynamic distribution, the driving torque of each driving wheel can be independently controlled and actively adjusted according to the operating state of the mining vehicle and road conditions, not only improving the adaptability to complex terrains, but also taking into account the power requirements of various working conditions, realizing the switch between low-speed high-torque and high-speed energy-saving modes, and achieving the best match between the vehicle's power performance and economy.

[0030] The present invention also protects the shifting drive method of the wheel-side drive system of the above-mentioned electric mining dump truck. The first shifting component and the second shifting component are initially in the neutral position, and it is characterized in that: When the second shifting component 4 is in the neutral position, shift the first shifting component 2 to the low gear. The output shaft 3 is in transmission connection with the first shifting component 2. The power of the multi-motor input component 1 is transmitted to the output shaft 3 through the first shifting component 2, and then decelerated by the planetary gear set 5 and drives the driving wheel to form the first-gear power. When the second shifting component 4 is in the neutral position, shift the first shifting component 2 to the high gear. The output shaft 3 is in transmission connection with the first shifting component 2. The power of the multi-motor input component 1 is transmitted to the output shaft 3 through the first shifting component, and then decelerated by the planetary gear set 5 and drives the driving wheel to form the second-gear power. When the first shifting component 2 is in the neutral position, shift the second shifting component 4. The multi-motor input component 1 is in transmission connection with the output shaft 3. The power of the multi-motor input component 1 is directly driven and transmitted to the output shaft 4, and then decelerated by the planetary gear set 5 and drives the driving wheel to form the third-gear power.

[0031] For the above-mentioned shifting drive method, initially, both the first shifting component 2 and the second shifting component 4 are in the neutral position, and the output shaft 3 is not connected to the first shifting component 2 and the multi-motor input component 1. Shift gears according to the working condition requirements. In the extreme heavy-load working condition, shift the first shifting component 2 to the low gear to form the first-gear power with super-large torque. In the heavy-load working condition, shift the first shifting component to the high gear to form the second-gear power with large torque. In the light-load working condition, shift the second shifting component 4 to form the third-gear power with high speed and low torque. The driving torque of each driving wheel can be independently controlled and actively adjusted according to the operating state of the mining vehicle and road conditions, not only improving the adaptability to complex terrains, but also taking into account the power requirements of various working conditions, realizing the switch between low-speed high-torque and high-speed energy-saving modes, and achieving the best match between the vehicle's power performance and economy.

[0032] Among them, "the shifting component two 4 engages the gear" means that the shifting sleeve 23 moves leftward to engage with the direct drive gear 21, forming a connection between the constant mesh gear shaft 10 and the output shaft 3, enabling the multi-motor input component 1 and the output shaft 3 to form a transmission connection, and the constant mesh gear shaft 10 directly transmits power to the output shaft 3; "shifting the shifting component one 2 to the low gear" means moving the shifting sleeve 16 rightward to engage with the first gear driving gear 17, and "shifting the shifting component one 16 to the high gear" means moving the shifting sleeve 16 leftward to engage with the second gear driving gear 18. When the shifting sleeve 16 engages with the first gear driving gear 17 or the second gear driving gear 18, the power of the constant mesh gear two 12 is transmitted to the intermediate shaft 13, and is transmitted to the first gear driving gear 17 or the second gear driving gear 18 through the shifting gear 15 and the shifting sleeve 16, and is transmitted to the output shaft 3 through the first gear driving gear 17 or the second gear driving gear 18, forming a transmission connection between the shifting component one 2 and the output shaft 3. The power of the constant mesh gear shaft 10 is transmitted to the output shaft 3 through the shifting component one 2. At this time, the output shaft rotates at a low speed and has a large torque, which is suitable for large torque driving requirements. By engaging the shifting sleeve 16 with the first gear driving gear or the second gear driving gear 18, two different torques and rotational speeds are formed on the output shaft. When the shifting sleeve 16 engages with the second gear driving gear 18, it meets the large torque requirement under heavy load conditions, and when the shifting sleeve 16 engages with the first gear driving gear 17, it meets the super-large torque requirement under extremely heavy load conditions.

[0033] The technical solutions of the embodiments of the present invention are completely described above in conjunction with the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

Claims

1. An electric mining dump wheel side drive system, comprising a gearbox and a planetary gear set on the periphery of the gearbox and fixed to the drive wheel, characterized in that: The gearbox includes three motors, a multi-motor input component for coupling the power of the three motors, a shift component 1 having a two-speed shifting function and connected to the multi-motor input component 1, an output shaft for transmitting power to a planetary gear and a shift component 2 assembled on the output shaft, the output shaft being connected to the input end of the planetary gear, the output shaft forming a transmission connection with the multi-motor input component 1 as the shift component 2 shifts gears, or forming a transmission connection with the shift component 1 as the shift component 1 shifts gears.

2. The electric mining dump wheel side drive system according to claim 1 is characterized in that: The three motors are motor one, motor two and motor three. The multi-motor input assembly includes input gear shafts fixed at the output ends of motor one and motor three respectively, a constant mesh gear shaft fixed at 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 wheel side drive system according to claim 2 is characterized in that: A constant mesh gear 2 with a smaller outer diameter than the constant mesh gear 1 is coaxially fixed on the constant mesh gear shaft, and the constant mesh gear 2 is meshed with the shift assembly 1.

4. The electric mining dump wheel side drive system according to claim 3 is characterized in that: The shift assembly 1 includes an intermediate shaft symmetrically arranged on both sides of the constant meshing gear 2, a constant meshing driven gear coaxially fixed on the intermediate shaft and meshing with the constant meshing gear 2, a shifting gear coaxially fixed on the intermediate shaft, a shifting gear sleeve axially slidably assembled 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 gear 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 wheel side drive system according to claim 4 is characterized in that: The output shaft is coaxially fixed with a first-gear driven gear meshing with the first-gear driving gear and a second-gear driven gear meshing with the second-gear driving gear.

6. The electric mining dump 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 second shift assembly includes a switching gear coaxially fixed on the output shaft and a switching gear sleeve axially slidably assembled on the switching gear. The switching gear sleeve moves to the left and engages with the direct drive gear.

7. The electric mining dump wheel side drive system according to claim 1 is characterized in that: The planetary gear is a two-stage planetary gear, including a first-stage sun gear fixed coaxially with the output shaft, a first-stage planetary gear meshing with the first-stage sun gear, a first-stage planetary carrier matched with the first-stage planetary gear and a first-stage ring gear meshed with the outer periphery of the first-stage planetary gear, a second-stage sun gear fixed coaxially with the first-stage planetary carrier, a second-stage planetary gear meshing with the second-stage sun gear, a second-stage planetary carrier matched with the second-stage planetary gear and a second-stage ring gear meshed with the outer periphery of the second-stage planetary gear, the first-stage ring gear is rotatably supported on the first-stage planetary carrier by a bearing, the second-stage planetary carrier is fixed to the housing of the gearbox, the first-stage ring gear is coaxially fixedly connected to the second-stage ring gear, the second-stage ring gear is supported on the outer periphery of the second-stage planetary carrier by a bearing, and is coaxially fixed to the drive wheel.

8. Electric mining dump truck, with integrated wheel side drive system on the driving wheel, characterized by: The wheel-side drive system is the wheel-side drive system of the electric mining dump truck as described in any one of claims 1 to 7.

9. The shift control method of the electric mining dump wheel side drive system according to any one of claims 1 to 7, wherein the first shift assembly and the second shift assembly are initially in a neutral position, characterized in that: The shift assembly 2 is in the neutral position, the shift assembly 1 is shifted to the low gear, the output shaft and the shift assembly 1 form a transmission connection, the power of the multi-motor input assembly is transmitted to the output shaft through the shift assembly 1, and then decelerated by the planetary gear and drives the drive wheel to form a first gear power; The shift assembly 2 is in the neutral position, the shift assembly 1 is shifted to the high gear, the output shaft and the shift assembly 1 form a transmission connection, the power of the multi-motor input assembly is transmitted to the output shaft through the shift assembly 1, and then decelerated by the planetary gear and drives the drive wheel to form the second gear power; The shift assembly 1 is in the neutral position, and the shift assembly 2 is used to engage the gear. The multi-motor input assembly forms a transmission connection with the output shaft. The power of the multi-motor input assembly is directly driven to the output shaft, and then decelerated by the planetary gear and drives the drive wheel to form a third-gear power.

10. The shift control method of the electric mining dump wheel side drive system according to claim 9, characterized in that: "Shifting the gear assembly to the second gear" means that the shift gear sleeve moves to the left and combines with the direct drive gear; "Shifting the gear assembly to the first gear" means that the shift gear sleeve moves to the right and combines with the first gear driving gear; "Shifting the gear assembly to the first gear" means that the shift gear sleeve moves to the left and combines with the second gear driving gear.

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