Wheel-side electric drive system for rigid mine car

Abstract

The wheel edge electric drive system of rigid mine car comprises a gearbox and a wheel end planetary gear assembled on a wheel hub, and is characterized in that the gearbox comprises a motor set formed by coaxial series connection of two axial flux motors, a parallel shaft variable speed assembly with two gear shifting functions and a parallel shaft structure, a single-stage planetary gear and a clutch installed on a housing of the gearbox and capable of adjusting a speed ratio of the single-stage planetary gear, the clutch is matched with the single-stage planetary gear, an input end of the parallel shaft variable speed assembly is coaxially connected with an output end of the motor set, an output end is coaxially connected with an input end of the single-stage planetary gear, and an output end of the single-stage planetary gear is coaxially connected with the wheel end planetary gear. The utility model can effectively reduce the unsprung mass, integrate the high-efficiency transmission of the parallel shaft and the compact torque distribution characteristics of the planetary gear, shorten the transmission chain, optimize the power distribution path, improve the stability and reliability of the transmission, improve the working condition adaptability of the vehicle, and meet the requirements of the lightweight and complex working condition adaptability of the rigid mine car equipment.

Description

Technical Field

[0001] This utility model relates to a wheel-side electric drive system for a rigid mining car, belonging to the field of wheel-side drive technology. Background Technology

[0002] Traditional mechanically driven dump trucks use mechanical differentials to control the differential speed of the left and right wheels during turns. With economic development, wheel-side drive is playing an increasingly important role in mining transportation. Wheel-side drive systems can fully leverage their structural advantages and the control function of the overall machine controller to achieve a wide range of power torque distribution without additional energy consumption. The driving 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 offers significant potential advantages in improving the overall traction performance and operational adaptability of the machine. Existing wheel-side drive systems mainly consist of a wheel-side motor, a planetary reducer, and brakes. The wheel-side motor inputs power to the sun gear of the planetary reducer through a spline sleeve. The sun gear meshes with three circumferentially distributed large planetary gears, which transmit power to the small planetary gears. The small planetary gears mesh with the ring gear, which outputs power to the wheel hub, driving the vehicle. Existing wheel-side drive systems cannot meet the requirements for lightweight equipment and adaptability to complex working conditions. This is because the wheel-side motors use a single high-power radial flux traction motor, a reverse-phase dual-rotor motor, or a composite multi-phase dual-rotor motor. High-power radial flux traction motors are bulky, have a high weight ratio, high manufacturing costs, and high system redundancy. On the other hand, reverse-phase dual-rotor motors and composite multi-phase dual-rotor motors have complex connection structures and cannot fully utilize the advantages of electric wheel drive, making it difficult to achieve independent control of the driving force of each wheel. Furthermore, although planetary reducers with high-speed planetary structures have a large speed ratio, they cannot adapt to the power requirements of various working conditions. Utility Model Content

[0003] The wheel-side electric drive system for rigid mining cars provided by this utility model can effectively reduce unsprung mass, integrate the high-efficiency transmission of parallel shafts with the compact torque distribution characteristics of planetary gears, shorten the transmission chain, optimize the power distribution path, improve the stability and reliability of transmission, enhance the vehicle's adaptability to working conditions, and meet the needs of lightweight rigid mining car equipment and adaptability to complex working conditions.

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

[0005] The wheel-side electric drive system of a rigid mining car includes a gearbox and a wheel-end planetary gear set mounted on the wheel hub. The gearbox comprises a motor unit formed by two axial flux motors connected coaxially in series, a parallel-shaft transmission assembly with two-speed function and a parallel-shaft structure, a single-stage planetary gear set, and a clutch mounted on the gearbox housing that adjusts the speed ratio of the single-stage planetary gear set. The clutch engages with the single-stage planetary gear set. The input end of the parallel-shaft transmission assembly is coaxially connected to the output end of the motor unit, and its output end is coaxially connected to the input end of the single-stage planetary gear set. The output end of the single-stage planetary gear set is coaxially connected to the wheel-end planetary gear set.

[0006] Preferably, the parallel shaft transmission assembly includes an input shaft connected to the output end of the motor set, an intermediate shaft parallel to the input shaft, and an output shaft coaxially aligned with the input shaft. The intermediate shaft meshes with the input shaft. An axially sliding shift sleeve, a rotatable gear drive gear one, and a rotatable gear drive gear two are mounted on the intermediate shaft. The shift sleeve is located between the gear drive gear one and the gear drive gear two. The shift sleeve slides backward to engage with the gear drive gear one and slides forward to engage with the gear drive gear two. A gear driven gear one meshes with the gear drive gear one, and a gear driven gear two meshes with the gear drive gear two, which are fixed on the output shaft.

[0007] Preferably, there are multiple intermediate shafts, which are evenly arranged on the outer periphery of the output shaft. The input shaft has an integrally formed constant mesh drive gear, and the intermediate shaft has an integrally formed constant mesh driven gear that meshes with the constant mesh drive gear.

[0008] Preferably, the sun gear of the single-stage planetary gear set is splinedly connected to the output shaft, the ring gear of the single-stage planetary gear set is engaged with the clutch and fixed as the clutch engages, and the planet carrier of the single-stage planetary gear set is coaxially connected to the end planetary gear set.

[0009] Preferably, the wheel-end planetary gear set includes a wheel-end sun gear 1 coaxially connected to the output end of the single-stage planetary gear set, a wheel-end planet carrier 1, a wheel-end planet gear 1 mounted on the wheel-end planet carrier 1 and meshing with the wheel-end sun gear 1, a wheel-end ring gear 1 with its inner ring meshing with the wheel-end planet gear 1, a wheel-end sun gear 2 coaxially connected to the wheel-end planet carrier 1, a wheel-end planet carrier 2 fixed to the wheel hub, a wheel-end planet gear 2 mounted on the wheel-end planet carrier 2 and meshing with the wheel-end sun gear 2, and a wheel-end ring gear 2 with its inner ring meshing with the wheel-end planet gear 2. The wheel-end ring gear 1 and the wheel-end ring gear 2 are integrally formed and fixed to the gearbox housing.

[0010] Preferably, the second gear ring at the wheel end is equipped with a wet brake that cooperates with the second planetary carrier at the wheel end, and the second planetary carrier at the wheel end is fixed by the braking of the wet brake.

[0011] The beneficial effects of this utility model are:

[0012] This utility model discloses a wheel-side electric drive system for a rigid mining car. The motor unit consists of two axial flux motors connected in series on the same axis, enabling independent control of the wheel's power and increasing the power density at the wheel end. The power from the motor unit is transmitted to the wheel-side planetary gear set via a parallel shaft transmission assembly and a single-stage planetary gear set, achieving wheel-side drive. The axial flux motors are small in size and light in weight, effectively reducing unsprung mass. The gearbox adopts a structure of a parallel shaft transmission assembly plus a single-stage planetary gear set, combining the high-efficiency transmission of the parallel shaft with the compact torque distribution characteristics of the planetary gears, shortening the transmission chain, optimizing the power distribution path, and improving the stability and reliability of the transmission. The two-speed function of the parallel shaft transmission assembly is combined with the clutch to adjust the speed ratio of the single-stage planetary gear set, forming a multi-speed transmission that meets the driving needs of various working conditions, such as full-load uphill driving, daily driving, high-speed cruising, and overtaking. This increases the coverage of the motor's high-efficiency range, enhances the vehicle's adaptability to various working conditions, and meets the requirements of lightweight rigid mining car equipment and adaptability to complex working conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the wheel-side electric drive system of the rigid mining car in a specific implementation.

[0014] Figure 2 This is a schematic diagram of the transmission structure of the gearbox. Detailed Implementation

[0015] The following is combined Figures 1-2 The embodiments of this utility model will be described in detail below.

[0016] The wheel-side electric drive system of a rigid mining car includes a gearbox and a wheel-end planetary gear set 5 mounted on a wheel hub 100. The gearbox comprises a motor set 1 formed by two axial flux motors connected coaxially in series, a parallel-shaft transmission assembly 2 with two-speed function and a parallel-shaft structure, a single-stage planetary gear set 3, and a clutch 4 mounted on the gearbox housing and adjustable in speed ratio. The clutch 4 engages with the single-stage planetary gear set 3. The input end of the parallel-shaft transmission assembly 2 is coaxially connected to the output end of the motor set 1, and its output end is coaxially connected to the input end of the single-stage planetary gear set 3. The output end of the single-stage planetary gear set 3 is coaxially connected to the wheel-end planetary gear set 5.

[0017] The wheel-side electric drive system of the rigid mining car described above consists of a motor unit 1 formed by two axial flux motors connected in series on the same axis. This allows for independent control of the wheel power and increases the power density at the wheel end. The power of the motor unit 1 is transmitted to the wheel-side planetary gear set 5 via a parallel shaft transmission assembly 2 and a single-stage planetary gear set 3, achieving wheel-side drive. The axial flux motors are small in size and light in weight, effectively reducing unsprung mass. The gearbox adopts a structure of parallel shaft transmission assembly 2 plus single-stage planetary gear set 3, combining the high-efficiency transmission of the parallel shaft with the compact torque distribution characteristics of the planetary gears, shortening the transmission chain, optimizing the power distribution path, and improving the stability and reliability of the transmission. The two-speed transmission function of the parallel shaft transmission assembly 3 is combined with the clutch 4 to adjust the speed ratio of the single-stage planetary gear set 3, forming a multi-speed transmission of the gearbox. This meets the driving needs of various working conditions, such as full-load uphill driving, daily driving, high-speed cruising, and overtaking, increasing the coverage of the motor's high-efficiency range, improving the vehicle's adaptability to working conditions, and meeting the requirements of lightweight rigid mining car equipment and adaptability to complex working conditions.

[0018] The parallel shaft transmission assembly 2 includes an input shaft 21 connected to the output end of the motor unit 1, an intermediate shaft 22 parallel to the input shaft 21, and an output shaft 23 coaxially aligned with the input shaft 21. The intermediate shaft 22 meshes with the input shaft 21. A shift sleeve 24 that can slide axially, a rotatable gear drive gear 25, and a rotatable gear drive gear 26 are mounted on the intermediate shaft 22. The shift sleeve 24 is located between the gear drive gear 25 and the gear drive gear 26. The shift sleeve 24 slides backward to engage with the gear drive gear 25 and slides forward to engage with the gear drive gear 26. A gear driven gear 27 that meshes with the gear drive gear 25 and a gear driven gear 28 that meshes with the gear drive gear 26 are fixed on the output shaft 23. The motor unit 1 drives the input shaft 21 to rotate, and the input shaft 21 drives the intermediate shaft 22 to rotate. The shift sleeve 24 is a sliding sleeve that is splined and mounted on the intermediate shaft 22. When the shift sleeve 24 is in neutral and not engaged with either the first gear 25 or the second gear 26, the power of the intermediate shaft 22 cannot be transmitted to the output shaft 23. When the shift sleeve 24 slides axially and engages with either the first gear 25 or the second gear 26, the power of the intermediate shaft 22 can be transmitted to the output shaft 23, and the output shaft 23 can drive the planetary gear set 5 to move. The shift sleeve 24 slides backward and engages with the first gear 25 to form the first gear of the parallel shaft transmission assembly 2. The shift sleeve 24 slides forward and engages with the second gear 26 to form the second gear of the parallel shaft transmission assembly 2.

[0019] The intermediate shafts 22 are multiple in number and evenly distributed around the outer periphery of the output shaft 23. A constant-mesh drive gear 211 is integrally formed on the input shaft 21, and a constant-mesh driven gear 221, meshing with the constant-mesh drive gear 211, is integrally formed on the intermediate shafts 22. The multiple intermediate shafts 22 share the transmission load, improving transmission reliability and stability. The power of the motor unit 1 is transmitted to the intermediate shafts 22 through the meshing of the constant-mesh drive gear 211 and the constant-mesh driven gear 221.

[0020] In this configuration, the sun gear of the single-stage planetary gear set 3 is splinedly connected to the output shaft 23. The ring gear of the single-stage planetary gear set 3 engages with the clutch 4 and is fixed when the clutch 4 is engaged. The planet carrier of the single-stage planetary gear set 3 is coaxially connected to the end-planetary gear set 5. When the clutch 4 is disengaged, the planet carrier in the single-stage planetary gear set 3 moves synchronously with the sun gear, and the speed ratio of the single-stage planetary gear set 3 is equal to 1. When the clutch 4 is engaged, the ring gear of the single-stage planetary gear set 3 is fixed, the output shaft 23 drives the sun gear of the single-stage planetary gear set 3, the sun gear drives the planet gears, and the planet gears drive the planet carrier. At this time, the speed ratio of the single-stage planetary gear set 3 is greater than 1. Therefore, by controlling the opening and closing of the clutch 4, the speed ratio of the single-stage planetary gear set 3 can be adjusted, thereby regulating the output torque and speed of the single-stage planetary gear set 3. When the shift sleeve 24 engages with the gear shift drive gear 25 and the clutch 4 engages to fix the ring gear of the single-stage planetary gear set 3, the transmission outputs first gear power. When the shift sleeve 24 engages with the gear shift main gear 26 and the clutch 4 engages to fix the ring gear of the single-stage planetary gear set 3, the transmission outputs second gear power. When the shift sleeve 24 engages with the gear shift drive gear 25 and the clutch 4 disengages, the transmission outputs third gear power. When the shift sleeve 24 engages with the gear shift drive gear 26 and the clutch 4 disengages, the transmission outputs fourth gear power. From first gear to fourth gear, the torque decreases sequentially while the speed increases sequentially, meeting the driving needs of various operating conditions such as fully loaded uphill driving, daily driving, high-speed cruising, and overtaking, improving the coverage of the motor's high-efficiency range, and enhancing the vehicle's adaptability to different operating conditions.

[0021] The wheel-end planetary gear set 5 includes a wheel-end sun gear 51 coaxially connected to the output end of the single-stage planetary gear set 3, a wheel-end planet carrier 52, a wheel-end planet gear 53 mounted on the wheel-end planet carrier 52 and meshing with the wheel-end sun gear 51, a wheel-end ring gear 54 whose inner ring meshes with the wheel-end planet gear 53, a wheel-end sun gear 55 coaxially connected to the wheel-end planet carrier 52, a wheel-end planet carrier 56 fixed to the wheel hub, a wheel-end planet gear 57 mounted on the wheel-end planet carrier 56 and meshing with the wheel-end sun gear 55, and a wheel-end ring gear 58 whose inner ring meshes with the wheel-end planet gear 57. The wheel-end ring gear 54 and the wheel-end ring gear 58 are integrally formed and fixed to the gearbox housing. The planet carrier of the single-stage planetary gear set 3 serves as the output end of the single-stage planetary gear set 3 and is coaxially connected to the wheel-end sun gear 51, driving the wheel-end sun gear 51 to rotate. The wheel-end sun gear 51 drives the wheel-end planet gear 53 to rotate, the wheel-end planet carrier 52 to rotate, and the wheel-end sun gear 55 to rotate. The power of the wheel-end planet gear 55 is transmitted to the wheel-end planet carrier 56 via the wheel-end planet gear 57, causing the wheel hub to move and realizing wheel-end drive. The wheel-end ring gear 54 and the wheel-end ring gear 58 are fixed to the gearbox housing. The wheel-end planetary gear set 5 has high structural stability and forms a reliable transmission to the wheel end.

[0022] The wheel-end gear ring 58 is equipped with a wet brake 6 that mates with the wheel-end planetary carrier 56. The wheel-end planetary carrier 56 is fixed when the wet brake 6 is applied. The wet brake 6, mounted on the wheel-end gear ring 58, fixes the wheel-end planetary carrier 56 upon activation, thus achieving wheel-end braking and further improving the safety of the drive system. Furthermore, the wet brake 6, installed between the wheel-end gear ring 58 and the wheel-end planetary carrier 56, does not increase the axial or radial space of the entire drive system, resulting in a compact and reliable structure.

[0023] 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. A wheel-side electric drive system for a rigid mining car, comprising a gearbox and a wheel-end planetary gear set mounted on the wheel hub, characterized in that: The gearbox includes a motor assembly formed by two axial flux motors connected in series on the same axis, a parallel shaft transmission assembly with two-speed function and a parallel shaft structure, a single-stage planetary gear set, and a clutch mounted on the gearbox housing that can adjust the speed ratio of the single-stage planetary gear set. The clutch engages with the single-stage planetary gear set. The input end of the parallel shaft transmission assembly is coaxially connected to the output end of the motor assembly, and the output end is coaxially connected to the input end of the single-stage planetary gear set. The output end of the single-stage planetary gear set is coaxially connected to the wheel-end planetary gear set.

2. The wheel-side electric drive system of the rigid mining car according to claim 1, characterized in that: The parallel shaft transmission assembly includes an input shaft connected to the output end of the motor set, an intermediate shaft parallel to the input shaft, and an output shaft coaxially aligned with the input shaft. The intermediate shaft meshes with the input shaft. An axially sliding shift sleeve, a rotatable gear drive gear one, and a rotatable gear drive gear two are mounted on the intermediate shaft. The shift sleeve is located between the gear drive gear one and the gear drive gear two. The shift sleeve slides backward to engage with the gear drive gear one and slides forward to engage with the gear drive gear two. A gear driven gear one meshes with the gear drive gear one, and a gear driven gear two meshes with the gear drive gear two, which are fixed on the output shaft.

3. The wheel-side electric drive system of the rigid mining car according to claim 2, characterized in that: The intermediate shafts are multiple in number and are evenly arranged on the outer periphery of the output shaft. The input shaft has an integrally formed constant mesh drive gear, and the intermediate shaft has an integrally formed constant mesh driven gear that meshes with the constant mesh drive gear.

4. The wheel-side electric drive system of the rigid mining car according to claim 2, characterized in that: The sun gear of the single-stage planetary gear set is splined to the output shaft, the ring gear of the single-stage planetary gear set is engaged with the clutch and is fixed as the clutch engages, and the planet carrier of the single-stage planetary gear set is coaxially connected to the end planetary gear set.

5. The wheel-side electric drive system of the rigid mining car according to claim 1, characterized in that: The aforementioned wheel-end planetary gear set includes a wheel-end sun gear 1 coaxially connected to the output end of the single-stage planetary gear set, a wheel-end planet carrier 1, a wheel-end planet gear 1 mounted on the wheel-end planet carrier 1 and meshing with the wheel-end sun gear 1, a wheel-end ring gear 1 with its inner ring meshing with the wheel-end planet gear 1, a wheel-end sun gear 2 coaxially connected to the wheel-end planet carrier 1, a wheel-end planet carrier 2 fixed to the wheel hub, a wheel-end planet gear 2 mounted on the wheel-end planet carrier 2 and meshing with the wheel-end sun gear 2, and a wheel-end ring gear 2 with its inner ring meshing with the wheel-end planet gear 2. The wheel-end ring gear 1 and the wheel-end ring gear 2 are integrally formed and fixed to the gearbox housing.

6. The wheel-side electric drive system of the rigid mining car according to claim 5, characterized in that: The wheel end gear ring 2 is equipped with a wet brake that cooperates with the wheel end planetary carrier 2, and the wheel end planetary carrier 2 is fixed by the braking of the wet brake.

Images