Wheel-side drive structure of rigid dump truck for mining

Abstract

The wheel-side drive structure of a rigid dump truck for mining includes a gearbox, a wheel-end planetary gear set mounted on the wheel hub, and an MCU controller mounted on the rear of the gearbox. The gearbox comprises a motor unit controlled by the MCU controller, a planetary reduction assembly formed by at least two single-stage planetary gear sets connected in series, and a clutch assembly mounted on the gearbox housing and cooperating with the planetary reduction assembly. The motor unit is formed by at least two axial flux motors connected coaxially in series. The input end of the planetary reduction assembly is connected to the motor unit, and the output end is connected to the input end of the wheel-end planetary gear set. The planetary reduction assembly adjusts its speed ratio according to the control of the clutch assembly. This invention ensures independent control of wheel power, reduces unsprung mass, achieves multi-level torque output, adapts to power demands in high-load, multi-terrain scenarios, improves the coverage of the motor's high-efficiency range, enhances the vehicle's adaptability to various operating conditions, and improves the reliability of the wheel-side drive.

Description

Technical Field

[0001] This utility model relates to a wheel-side drive structure for a rigid mining dump truck, 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 high-load and multi-terrain scenarios. Utility Model Content

[0003] The wheel-side drive structure of the rigid dump truck for mining provided by this utility model ensures independent control of the wheel power, reduces unsprung mass, realizes multi-level torque output, adapts to the power requirements under high load and multi-terrain scenarios, improves the coverage of the high-efficiency range of the motor, enhances the vehicle's adaptability to working conditions, and improves the reliability of the wheel-side drive.

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

[0005] The wheel-side drive structure of a rigid dump truck for mining includes a gearbox, a wheel-end planetary gear set mounted on the wheel hub, and an MCU controller mounted on the rear side of the gearbox. The gearbox comprises a motor unit controlled by the MCU controller, a planetary reduction assembly formed by at least two single-stage planetary gear sets connected in series, and a clutch assembly mounted on the gearbox housing and cooperating with the planetary reduction assembly. The motor unit is formed by at least two axial flux motors connected coaxially in series. The input end of the planetary reduction assembly is connected to the motor unit, and the output end is connected to the input end of the wheel-end planetary gear set. The planetary reduction assembly adjusts its speed ratio according to the control of the clutch assembly.

[0006] Preferably, the planetary reduction gear assembly is formed by a primary planetary gear set and a secondary planetary gear set connected in series. The primary planetary gear set includes a primary sun gear connected to the motor set, a primary planet carrier, primary planet gears mounted on the primary planet carrier and meshing with the primary sun gear, and a primary gear ring with an inner ring meshing with the primary planet gear. The secondary planetary gear set includes a secondary sun gear connected to the primary planet carrier, a secondary planet carrier connected to the input end of the wheel-end planetary gear set, secondary planet gears mounted on the secondary planet carrier and meshing with the secondary sun gear, and a secondary gear ring with an inner ring meshing with the secondary planet gear.

[0007] Preferably, the clutch assembly includes a clutch A that engages with a primary gear ring and a clutch B that engages with a secondary gear ring. The primary gear ring is fixed when clutch A is engaged, and the secondary gear ring is fixed when clutch B is engaged.

[0008] Preferably, clutch A and clutch B are electromagnetic clutches mounted on the housing of the gearbox.

[0009] Preferably, the wheel-end planetary gear set includes a wheel-end sun gear 1 connected to the secondary planetary carrier, a wheel-end planetary carrier 1, a wheel-end planetary gear 1 mounted on the wheel-end planetary 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 planetary gear 1, a wheel-end sun gear 2 fixedly connected to the wheel-end planetary carrier 1, a wheel-end planetary carrier 2 fixed to the gearbox housing, a wheel-end planetary gear 2 mounted on the wheel-end planetary carrier 2, and a wheel-end ring gear 2 with its inner ring meshing with the wheel-end planetary gear 2. The wheel-end ring gear 1 and the wheel-end ring gear 2 are splined connected, and the wheel-end ring gear 2 is fixed to the wheel hub.

[0010] The beneficial effects of this utility model are:

[0011] This utility model discloses a wheel-side drive structure for a mining rigid dump truck. The motor unit consists of at least two axial flux motors connected in series on the same axis. An MCU controller provides power to the wheels, ensuring independent control of wheel power and meeting the driving requirements of the mining dump truck. The axial flux motors are small in size and lightweight, effectively reducing unsprung mass. The planetary reduction assembly consists of at least two single-stage planetary gear sets connected in series. The speed ratio is adjusted by a clutch assembly, forming a multi-stage planetary gear set and clutch engagement multi-speed transmission structure. This achieves multi-level torque output, adapting to the power demands of high-load, multi-terrain scenarios, improving the coverage of the motor's high-efficiency range, enhancing the vehicle's adaptability to various working conditions, and utilizing the planetary gear set's high torque capacity and impact resistance to improve structural stability during high-torque transmission and enhance the reliability of the wheel-side drive. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the wheel-side drive structure of the rigid dump truck for mining in a specific implementation.

[0013] Figure 2 This is a schematic diagram of the transmission structure of the gearbox and the planetary gear set at the wheel end.

[0014] Figure 3 This is a schematic diagram of the transmission structure of the gearbox. Detailed Implementation

[0015] The following is combined Figures 1-3 The embodiments of this utility model will be described in detail below.

[0016] The wheel-side drive structure of a rigid dump truck for mining includes a gearbox 8, a wheel-end planetary gear set 4 mounted on the wheel hub, and an MCU controller 5 mounted on the rear side of the gearbox. The gearbox comprises a motor assembly 1 controlled by the MCU controller 5, a planetary reduction assembly 2 formed by at least two single-stage planetary gear sets connected in series, and a clutch assembly 3 mounted on the gearbox housing and cooperating with the planetary reduction assembly 2. The motor assembly 1 is formed by at least two axial flux motors 11 connected coaxially in series. The input end of the planetary reduction assembly 2 is connected to the motor assembly 1, and its output end is connected to the input end of the wheel-end planetary gear set 4. The planetary reduction assembly 2 adjusts its speed ratio according to the control of the clutch assembly 3.

[0017] The wheel-side drive structure of the mining rigid dump truck described above consists of a motor unit 1 formed by at least two axial flux motors 11 connected in series on the same axis. The MCU controller 5 controls the power supply to the wheels, ensuring independent control of the wheel power and meeting the driving requirements of the mining dump truck. The axial flux motors are small in size and light in weight, effectively reducing unsprung mass. The planetary reduction assembly 2 is formed by at least two single-stage planetary gear sets connected in series, and the speed ratio is adjusted by the clutch assembly 3, forming a multi-stage planetary gear set and clutch engagement multi-speed transmission structure. This achieves multi-speed torque output, adapting to the power requirements of high-load and multi-terrain scenarios, improving the coverage of the motor's high-efficiency range, enhancing the vehicle's adaptability to various working conditions, and utilizing the planetary gear set's high torque carrying capacity and impact resistance to improve structural stability during high-torque transmission and enhance the reliability of the wheel-side drive.

[0018] The planetary reduction assembly 2 is formed by connecting a first-stage planetary gear set 6 and a second-stage planetary gear set 7 in series. The first-stage planetary gear set 6 includes a first-stage sun gear 61 connected to the motor assembly 1, a first-stage planet carrier 62, first-stage planet gears 63 mounted on the first-stage planet carrier 62 and meshing with the first-stage sun gear 61, and a first-stage ring gear 64 with its inner ring meshing with the first-stage planet gear 63. The second-stage planetary gear set 7 includes a second-stage sun gear 71 connected to the first-stage planet carrier 62, a second-stage planet carrier 72 connected to the input end of the wheel-end planetary gear set 4, second-stage planet gears 73 mounted on the second-stage planet carrier 72 and meshing with the second-stage sun gear 71, and a second-stage ring gear 74 with its inner ring meshing with the second-stage planet gear 73. The planetary reduction assembly 2 is formed by connecting two single-stage planetary gear sets in series. The connection between the first-stage planet carrier 62 and the second-stage sun gear 71 of the first-stage planetary gear set allows the power of the first-stage planetary gear set 6 to be transmitted to the second-stage planetary gear set 7. The second-stage planet carrier 72 can transmit the power of the second-stage planetary gear set 7 to the wheel-end planetary gear set 4. Both the first-stage and second-stage planetary gear sets use their respective planet carriers as output ends.

[0019] The clutch assembly 3 includes clutch A, which engages with a primary gear ring 64, and clutch B, which engages with a secondary gear ring 74. The primary gear ring 64 is fixed when clutch A is engaged, and the secondary gear ring 74 is fixed when clutch B is engaged. When clutch A is engaged, the primary gear ring 64 is fixed and cannot rotate; when clutch B is disengaged, the primary gear ring 64 is in a free, rotatable state. When clutch B is engaged, the secondary gear ring 74 is fixed and cannot rotate; when clutch B is disengaged, the secondary gear ring 74 is in a free, rotatable state. Controlling the opening and closing of clutches A and B enables the planetary reduction assembly 2 to form multiple speed ratios. When both clutches A and B are engaged, both the primary gear ring 64 and the secondary gear ring 74 are fixed. The power input from the motor unit 1 is sent to the primary sun gear 61, reduced in speed by the primary planetary gear set 6, and then transmitted to the secondary sun gear set 62 via the primary planetary carrier 62. The power from the first-stage sun gear 61 is reduced in speed by the second-stage planetary gear set 7 and then transmitted to the end planetary gear set 4 via the second-stage planetary carrier 72, forming first-gear power. When clutch A is disengaged and clutch B is engaged, the first-stage ring gear 64 is in a freely rotatable state, the first-stage planetary gear set 6 has no reduction function, and the power input of the motor unit is to the first-stage sun gear 61. The first-stage sun gear 61 drives the first-stage planetary carrier 62 to rotate synchronously. The first-stage planetary carrier 62 transmits power to the second-stage sun gear 71, which is reduced in speed by the second-stage planetary gear set 7 and then transmitted to the end planetary gear set 4 via the second-stage planetary gear set 72, forming second-gear power. When clutch A is engaged and clutch B is engaged, the power input of the first-stage sun gear 61 is to the first-stage planetary carrier 62, which drives the first-stage planetary carrier 62 to rotate synchronously. The first-stage planetary carrier 62 transmits power to the second-stage sun gear 71, which is reduced in speed by the second-stage planetary gear set 7 and then transmitted to the end planetary gear set 4 via the second-stage planetary carrier 72, forming second-gear power. When clutch B is disengaged, the first-stage ring gear 64 is fixed, and the power input of motor unit 1 is sent to the first-stage sun gear 61. After being reduced in speed by the first-stage planetary gear set 6, the power is transmitted to the second-stage sun gear 71 via the first-stage planetary carrier 62. The second-stage ring gear 74 is in a free, rotatable state. The second-stage planetary gear set 6 has no speed reduction function. The second-stage sun gear 71 drives the second-stage planetary carrier 62 to rotate synchronously. The second-stage planetary carrier 62 transmits power to the end planetary gear set 4, forming a three-speed power system. When both clutch A and clutch B are disengaged, both the first-stage and second-stage ring gear 64 are in a free, rotatable state. The first-stage planetary gear set 6 and the second-stage... Planetary gear set 7 has no reduction function. The power input of motor set 1 is to the first-stage sun gear 61. The first-stage sun gear 61 drives the first-stage planetary carrier 62 to rotate synchronously. The first-stage planetary carrier 62 drives the second-stage sun gear 71 and the second-stage planetary carrier 72 to rotate synchronously. The second-stage planetary carrier 72 transmits power to the wheel end planetary gear set 4, forming four power levels. The torque decreases sequentially from the first power level to the fourth power level, while the speed increases sequentially, meeting the driving requirements under different working conditions, improving the coverage of the motor's high-efficiency range, enhancing the vehicle's adaptability to working conditions, and adapting to the power requirements under high load and multi-terrain scenarios.

[0020] Clutch A and Clutch B are electromagnetic clutches mounted on the gearbox housing. Electromagnetic clutches offer high control precision, improving shifting reliability and efficiency.

[0021] The wheel-end planetary gear set 4 includes a wheel-end sun gear 41 connected to the secondary planetary carrier 72, a wheel-end planetary carrier 42, a wheel-end planetary gear 43 mounted on the wheel-end planetary carrier 42 and meshing with the wheel-end sun gear 41, a wheel-end ring gear 44 whose inner ring meshes with the wheel-end planetary gear 43, a wheel-end sun gear 45 fixedly connected to the wheel-end planetary carrier 42, a wheel-end planetary carrier 46 fixed to the gearbox housing, a wheel-end planetary gear 47 mounted on the wheel-end planetary carrier 46, and a wheel-end ring gear 48 whose inner ring meshes with the wheel-end planetary gear 47. The wheel-end ring gear 44 and the wheel-end ring gear 48 are splined connected, and the wheel-end ring gear 48 is fixed to the wheel hub. The wheel-end planetary gear set 4 is formed by two single-stage planetary gear sets connected in series. The second-stage planetary carrier 72 in the planetary reduction assembly 2 transmits power to the wheel-end sun gear 1 41. The wheel-end sun gear 1 41 drives the wheel-end planetary gear 1 43 to rotate. The wheel-end planetary gear 1 43 drives the wheel-end planetary carrier 1 42 to rotate. The wheel-end planetary carrier 1 42 drives the wheel-end sun gear 2 45 to rotate. The wheel-end sun gear 2 45 drives the wheel-end planetary gear 2 47 to rotate. Since the wheel-end planetary carrier 2 46 is fixed, the wheel-end planetary gear 2 47 drives the wheel-end ring gear 2 48 to rotate. The wheel-end ring gear 2 48 drives the wheel-end ring gear 1 44 to rotate synchronously and transmits power to the wheel hub, causing the wheel to rotate. The wheel-end planetary gear set 4 reduces the output power of the planetary reduction assembly 2 by torque, increases the wheel-end torque, and meets the high-torque drive requirements of the mining rigid dump truck.

[0022] 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 drive structure for a rigid dump truck used in mining, comprising a gearbox, a wheel-end planetary gear set mounted on the wheel hub, and an MCU controller mounted on the rear side of the gearbox, characterized in that: The gearbox includes a motor set controlled by an MCU controller, a planetary reduction assembly formed by at least two single-stage planetary gear sets connected in series, and a clutch assembly mounted on the gearbox housing and cooperating with the planetary reduction assembly. The motor set is formed by at least two axial flux motors connected in series on the same axis. The input end of the planetary reduction assembly is connected to the motor set, and the output end is connected to the input end of the wheel-end planetary gear set. The planetary reduction assembly adjusts the speed ratio according to the control of the clutch assembly.

2. The wheel-side drive structure of the rigid dump truck for mining as described in claim 1, characterized in that: The planetary reduction gear assembly is formed by a primary planetary gear set and a secondary planetary gear set connected in series. The primary planetary gear set includes a primary sun gear connected to the motor set, a primary planet carrier, primary planet gears mounted on the primary planet carrier and meshing with the primary sun gear, and a primary gear ring with an inner ring meshing with the primary planet gear. The secondary planetary gear set includes a secondary sun gear connected to the primary planet carrier, a secondary planet carrier connected to the input end of the wheel-end planetary gear set, secondary planet gears mounted on the secondary planet carrier and meshing with the secondary sun gear, and a secondary gear ring with an inner ring meshing with the secondary planet gear.

3. The wheel-side drive structure of the rigid dump truck for mining as described in claim 2, characterized in that: The clutch assembly includes a clutch A that engages with a primary gear ring and a clutch B that engages with a secondary gear ring. The primary gear ring is fixed when clutch A is engaged, and the secondary gear ring is fixed when clutch B is engaged.

4. The wheel-side drive structure of the rigid dump truck for mining as described in claim 2, characterized in that: Clutch A and Clutch B are electromagnetic clutches mounted on the housing of the gearbox.

5. The wheel-side drive structure of the rigid dump truck for mining as described in claim 2, characterized in that: The aforementioned wheel-end planetary gear set includes a wheel-end sun gear 1 connected to a secondary planetary carrier, a wheel-end planetary carrier 1, a wheel-end planetary gear 1 mounted on the wheel-end planetary 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 planetary gear 1, a wheel-end sun gear 2 fixedly connected to the wheel-end planetary carrier 1, a wheel-end planetary carrier 2 fixed to the gearbox housing, a wheel-end planetary gear 2 mounted on the wheel-end planetary carrier 2, and a wheel-end ring gear 2 with its inner ring meshing with the wheel-end planetary gear 2. The wheel-end ring gear 1 and the wheel-end ring gear 2 are splined together, and the wheel-end ring gear 2 is fixed to the wheel hub.

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