Dual-motor wheel edge driving assembly and driving method of heavy truck

Abstract

A double-motor wheel edge driving assembly comprises a gearbox and a planet row which is connected with the gearbox and drives a driving wheel to move, and is characterized in that the gearbox comprises two motors, an input assembly which couples power of the two motors, a two-gear speed change mechanism which is in coaxial butt joint with the input assembly and has a two-gear speed change function, and an output shaft which is connected with the two-gear speed change mechanism; the output shaft extends into the two-gear speed change mechanism and is coaxially aligned with the input assembly, the two motors are symmetrically arranged with the axis of the output shaft as the center, a sun gear of the planet row is fixed to the output shaft, a planet carrier is fixed to the gearbox shell, and a gear ring is supported on the periphery of the gearbox shell through a bearing and fixed to a driving wheel. According to the invention, the adaptability to complex terrains is improved, the axial size of the whole driving assembly is shortened, the problem of center-of-gravity shift is avoided, the driving structure and the driving wheel can be coaxially aligned, and the stability of the driving wheel in the running process is improved. The invention further provides a driving method of the heavy truck.

Description

Technical Field

[0001] The invention relates to a dual-motor wheel drive assembly, belonging to the technical field of heavy truck wheel drives. The invention also relates to a driving method for a heavy truck. Background Art

[0002] Traditional electric drive systems are divided into central drive axle layout and motor direct drive wheel side layout. In the central layout electric drive system, the drive motor is assembled with the AMT gearbox or reduction box, and is fixedly connected to the bridge housing. The power is output to the wheel end through the differential to the half-axle. Heavy trucks have high power and climbing requirements, but the mechanical differential will affect the vehicle's passability, reduce the vehicle's safety, and is not conducive to improving the vehicle's handling stability. Compared with the central drive axle, the wheel-side drive can give full play to its own configuration advantages and the control function of the whole machine controller, and realize 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 vehicle's operating status and road conditions to form an electronic differential, which is easier to improve the potential advantages of the whole machine's traction performance and operational adaptability. However, in the single-motor wheel-side drive, the single motor needs to take into account too many working conditions. A single motor drive cannot meet the large torque power output requirements under heavy loads. A single large torque, low speed drive motor is required, combined with a fixed speed ratio reduction device. This will lead to problems such as heavy weight and high manufacturing cost of the electric drive system, and insufficient power performance at medium and high speeds. Therefore, heavy-duty commercial vehicle electric drive products will use multiple motors. Considering lightweight motors, high-speed motors are selected. Under the same power condition, the motor torque can be reduced, and the motor size and weight are small. Multiple motors, reducers and transmissions are concentrated on the wheel side and fixed to the wheel hub to form an electric wheel. Although it can effectively improve the vehicle's power performance, the dual-motor wheel-side drive structure has the following problems: 1. The dual-motor power coupling structure, the deceleration multi-axis structure and the speed shifting structure connected in sequence will cause the axial size of the electric wheel to be larger, and the requirements for installation space are high.

[0003] 2. Under variable working conditions, the motor cannot be kept running in the high-efficiency range, resulting in energy waste and failure to achieve the best match between the vehicle's power and economy.

[0004] 3. The offset setting of the motor causes the problem of center of gravity offset, which will affect the stability of the electric wheel operation.

[0005] 4. Gear shifting will cause power interruption due to frequent gear shifting and reduce comfort. Summary of the invention

[0006] The dual-motor wheel-side drive assembly provided by the present invention improves the power density of the driving wheel torque, enables the motor to work in the high-efficiency zone, reduces energy consumption, improves the adaptability to complex terrain, achieves the best match between the power and economy of the whole vehicle, shortens the axial size of the entire driving assembly, avoids the problem of center of gravity offset, enables the driving structure and the driving wheel to form a coaxial alignment, and improves the stability of the driving wheel during operation. The present invention also provides a driving method for a heavy truck.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: A dual-motor wheel-side drive assembly includes a gearbox and a planetary gear connected to the gearbox and driving the drive wheel to move, and is characterized in that: the gearbox includes two motors, an input component that couples the power of the two motors, a two-speed transmission mechanism that is coaxially docked with the input component and has a two-speed transmission function, and an output shaft connected to the two-speed transmission mechanism, the output shaft extends into the two-speed transmission mechanism and is coaxially aligned with the input component, the two motors are symmetrically arranged with the axis of the output shaft as the center, the sun gear of the planetary gear is fixed to the output shaft, the planetary carrier is fixed to the gearbox housing, and the ring gear is supported on the outer periphery of the gearbox housing through a bearing and is fixed to the drive wheel.

[0008] Preferably, the input assembly includes an input shaft 1 connected to one motor, an input shaft 2 connected to another motor, and a constant meshing shaft respectively meshing with the input shaft 1 and the input shaft 2, and the constant meshing shaft is connected to the input end of the two-speed transmission mechanism.

[0009] Preferably, the two-speed transmission mechanism includes an intermediate gear coaxially connected to the constant mesh shaft through a spline, an intermediate shaft meshing with the intermediate gear, and a shift assembly mounted on the intermediate shaft. The number of intermediate shafts is two and they are symmetrically distributed on both sides of the constant mesh shaft, and the shift assemblies on the two intermediate shafts are respectively meshed with the output shaft.

[0010] Preferably, the shift assembly includes a constant meshing gear coaxially fixed on the intermediate shaft and meshing with the intermediate gear, a shift gear coaxially fixed on the intermediate shaft, an axially slidable shift gear sleeve mounted on the shift gear, a first gear driving gear and a second gear driving gear rotatably mounted on the intermediate shaft through an idler shaft, the shift gear sleeve moves to the left to engage with the first gear driving gear and moves to the right to engage with the second gear driving gear, and the first gear driving gear and the second gear driving gear are respectively connected to the output shaft.

[0011] 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.

[0012] Preferably, planet gear one and planet gear two having an outer diameter smaller than that of planet gear one are coaxially fixed on the planet gear shaft of the planet carrier, planet gear one is meshed with the sun gear, and planet gear two is meshed with the inner gear ring.

[0013] Preferably, the output shaft and the sun gear are integrally formed, the planet carrier is fixed to the rear side of the gearbox housing, the planetary gear shaft is arranged forward and parallel to the output shaft, and is rotatably mounted between the planet carrier and the gearbox housing.

[0014] A driving method for a heavy truck, wherein the driving wheels of the heavy truck are all equipped with the above-mentioned dual-motor wheel-side drive assembly, characterized in that: According to the load and operating conditions of the heavy truck, the number of motors driven in the dual-motor wheel-side drive assembly and the gear position of the two-speed transmission mechanism on each drive wheel are adjusted; When a heavy truck is on a light-load flat road, each drive wheel is driven by a single motor, and the two-speed transmission mechanism is shifted to high gear, forming a light-load moving mode for the heavy truck; When a heavy-duty truck is in a light-load climbing condition, each drive wheel is driven by a single motor, and the two-speed transmission mechanism is shifted to the low gear, forming a light-load climbing mode for a heavy-duty loader; When a heavy-duty truck is in a heavy-load climbing condition, two motors are used on each driving wheel to drive, and the two-speed transmission mechanism is shifted to the low gear, forming a heavy-load climbing mode of a heavy-duty loader; When a heavy-duty truck is on a heavy-load flat road, two motors are used to drive each driving wheel, and the two-speed transmission mechanism is shifted to high gear, forming a heavy-load moving mode of a heavy-duty loader; When a heavy truck is on a muddy or turning road, the number of motors transmitted in the dual-motor wheel-side drive assembly on each drive wheel and the gear position of the two-speed transmission mechanism are controlled separately, so that the output torque and speed of the left and right aligned drive wheels are unequal, forming an electronic differential.

[0015] Preferably, "shifting the two-speed transmission mechanism to a low gear" means that the shift sleeve moves to the left to engage with the first gear driving gear, and "shifting the two-speed transmission mechanism to a high gear" means that the shift sleeve moves to the right to engage with the second gear driving gear.

[0016] The beneficial effects of the invention are: The dual-motor wheel-side drive assembly of the present invention has an input component that couples the power of the two motors and transmits it to a two-speed transmission mechanism. The two-speed transmission mechanism forms a two-speed power transmission output shaft with different rotation speeds and torques through gear shifting. The output shaft transmits the power to the planetary gear set, and after the planetary gear set is decelerated and torque increased, it drives the drive wheel to move, realizes driving, forms a low-speed and high-torque drive, improves the power density of the drive wheel torque, breaks through the power density limit of a single motor, and can adjust the number of motors transmitted in the dual-motor wheel-side drive assembly and the two-speed transmission according to the load and operating conditions of the heavy truck. The gear position of the mechanism, when the heavy truck is under light load flat road conditions, a single motor is selected for transmission, and the two-speed transmission mechanism is shifted to high gear, forming a light load moving mode of the heavy truck; when the heavy truck is under light load climbing conditions, a single motor is selected for transmission, and the two-speed transmission mechanism is shifted to low gear, forming a light load climbing mode of the heavy load loader; when the heavy truck is under heavy load climbing conditions, the two motors are synchronously driven, and the two-speed transmission mechanism is shifted to low gear, forming a heavy load climbing mode of the heavy load loader; when the heavy truck is under heavy load flat road conditions, The two motors are driven synchronously, and the two-speed transmission mechanism is shifted to high gear, forming a heavy-load mobile mode for the heavy-duty loader, taking into account the power requirements of various working conditions, realizing the switching of dual-motor and single-motor drive modes, realizing power redundancy and dynamic distribution, making the motor work in the high-efficiency area, and reducing energy consumption. When the heavy truck is on muddy or turning roads, the number of motors driven in the dual-motor wheel-side drive assembly on each drive wheel and the gear position of the two-speed transmission mechanism are controlled separately, so that the output torque and speed of the left and right aligned drive wheels are unequal, forming an electronic differential, and improving Improve the adaptability to complex terrain and achieve the best match between the power and economy of the whole vehicle; the input component is coaxially aligned with the two-speed transmission mechanism, the output shaft extends into the two-speed transmission mechanism and is coaxially aligned with the input component and is fixed to the sun gear of the planetary gearbox, the two motors are symmetrically arranged with the output shaft axis as the center, the ring gear is arranged outside the gearbox housing, the axial dimension of the entire drive assembly is shortened, and a rotational symmetrical structure with the output shaft as the center is formed to avoid the problem of center of gravity offset, so that the drive structure and the drive wheel can be coaxially aligned, and the stability of the drive wheel during operation is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a transmission schematic diagram of the dual-motor wheel-side drive assembly of the present invention.

[0018] Figure 2 This is a transmission diagram of the dual-motor wheel-side drive assembly when forming a first-gear power drive.

[0019] Figure 3 This is a transmission diagram of the dual-motor wheel-side drive assembly when forming second-gear power drive. DETAILED DESCRIPTION

[0020] Combine the following Figures 1 to 3The embodiments of the present invention are described in detail.

[0021] A dual-motor wheel-side drive assembly includes a gearbox and a planetary gear row 5 connected to the gearbox and driving the drive wheel to move, characterized in that the gearbox includes two motors 1, an input component 2 that couples the power of the two motors, a two-speed transmission mechanism 3 that is coaxially docked with the input component 2 and has a two-speed transmission function, and an output shaft 4 connected to the two-speed transmission mechanism 3, the output shaft 4 extends into the two-speed transmission mechanism 3 and is coaxially aligned with the input component 2, the two motors 1 are symmetrically arranged with the axis of the output shaft 4 as the center, the sun gear 6 of the planetary gear row is fixed to the output shaft 4, the planetary carrier 7 is fixed to the gearbox housing 9, and the ring gear 8 is supported on the outer periphery of the gearbox housing through a bearing and is fixed to the drive wheel 100.

[0022] In the dual-motor wheel-side drive assembly described above, the input component 2 couples the power of the two motors 1 and transmits it to the two-speed transmission mechanism 3. The two-speed transmission mechanism 3 forms a two-speed power transmission output shaft 4 with different speeds and torques through gear shifting. The output shaft 4 transmits the power to the planetary gear 5, and drives the drive wheel 100 to move after the deceleration and torque increase of the planetary gear 5, realizing the drive, forming a low-speed and high-torque drive, improving the power density of the drive wheel torque, breaking through the power density limit of a single motor, and the number and power density of the motors transmitted in the dual-motor wheel-side drive assembly can be adjusted according to the load and operating conditions of the heavy truck. The gear position of the two-speed transmission mechanism 3 is that when the heavy truck is under light-load flat road conditions, a single motor is selected for transmission, and the two-speed transmission mechanism 3 is shifted to high gear, forming a light-load moving mode of the heavy truck; when the heavy truck is under light-load climbing conditions, a single motor is selected for transmission, and the two-speed transmission mechanism is shifted to low gear, forming a light-load climbing mode of the heavy-load loader; when the heavy truck is under heavy-load climbing conditions, the two motors 1 are synchronously driven, and the two-speed transmission mechanism 3 is shifted to low gear, forming a heavy-load climbing mode of the heavy-load loader; when the heavy truck is under heavy-load flat road conditions, the two motors 1 are synchronously driven, and the two-speed transmission mechanism 3 is shifted to low gear, forming a heavy-load climbing mode of the heavy-load loader; , the two motors 1 are driven synchronously, and the two-speed transmission mechanism 3 is shifted to high gear, forming a heavy-load mobile mode of the heavy-duty loader, taking into account the power requirements of various working conditions, realizing the switching of dual-motor and single-motor drive modes, realizing power redundancy and dynamic distribution, making the motor work in the high-efficiency area, reducing energy consumption, and when the heavy truck is on muddy or turning roads, the number of motors driven in the dual-motor wheel-side drive assembly on each drive wheel and the gear position of the two-speed transmission mechanism are controlled separately, so that the output torque and speed of the left and right aligned drive wheels are different, forming an electronic differential, and improving complex roads. The shape adaptability is achieved to achieve the best match between the power and economy of the whole vehicle; the input component 2 is coaxially aligned with the two-speed transmission mechanism 3, the output shaft 4 extends into the two-speed transmission mechanism 3 and is coaxially aligned with the input component 2 and is fixed to the sun gear 6 of the planetary row 5, the two motors 1 are symmetrically arranged with the axis of the output shaft 4 as the center, and the ring gear 8 is arranged outside the gearbox housing, shortening the axial size of the entire drive assembly and forming a rotational symmetrical structure with the output shaft 4 as the center, avoiding the problem of center of gravity offset, so that the drive structure and the drive wheel can be coaxially aligned, and the stability of the drive wheel during operation is improved.

[0023] The input assembly 2 includes an input shaft 1 21 connected to one motor 1, an input shaft 2 22 connected to another motor 1, and a constant meshing shaft 23 respectively meshed with the input shaft 1 21 and the input shaft 2 22, and the constant meshing shaft 23 is connected to the input end of the two-speed transmission mechanism 3. The power of the two motors 1 is coupled to the constant meshing shaft 23 through the meshing of the input shaft 1 21 and the input shaft 2 22 with the constant meshing shaft 23, and is transmitted to the two-speed transmission mechanism 3 through the constant meshing shaft 23, forming a coupled transmission of the power of the two motors.

[0024] The two-speed transmission mechanism 3 includes an intermediate gear 31 coaxially connected to the constant mesh shaft 23 through a spline, an intermediate shaft 32 meshing with the intermediate gear 31, and a shift assembly 33 mounted on the intermediate shaft 32. There are two intermediate shafts 32 and they are symmetrically distributed on both sides of the constant mesh shaft 23. The shift assemblies 2 on the two intermediate shafts 32 are respectively meshed with the output shaft 4. The constant mesh shaft 23 drives the intermediate gear 31 to rotate synchronously, and the intermediate gear shaft 32 drives the two intermediate shafts 32 to rotate synchronously. The power on the intermediate shaft 32 can be transmitted to the output shaft 4 by shifting the shift assembly 33 to form two gears with different speeds and torques. There are two groups of shift assemblies 2. When one group of shift assemblies 2 is shifted, the other group of shift assemblies 2 protects the current gear position unchanged, avoids the risk of power interruption, and reduces the power impact caused by the synchronous shifting of the two groups of shift assemblies, improves the softness of shifting, and improves the safety of continuous operation of the vehicle under heavy load conditions.

[0025] The shift assembly 33 includes a constant meshing gear 34 coaxially fixed on the intermediate shaft 32 and meshing with the intermediate gear 31, a shift gear 35 coaxially fixed on the intermediate shaft 32, a shift gear sleeve 36 axially slidably mounted on the shift gear 35, and a first gear driving gear 37 and a second gear driving gear 38 rotatably mounted on the intermediate shaft 32 through an idler shaft. The shift gear sleeve 36 moves to the left and is coupled to the first gear driving gear 37, and moves to the right and is coupled to the second gear driving gear 38. The first gear driving gear 36 and the second gear driving gear 38 are respectively connected to the output shaft 4. The intermediate gear 31 drives the constantly meshing gear 34 to rotate synchronously, so that the two intermediate shafts 32 rotate synchronously, and the shift gear 35 rotates synchronously with the intermediate shaft 32. The shift gear sleeve 36 is located between the first gear driving gear 36 and the second gear driving gear 38 in the initial state, and is not combined with both. At this time, the shift gear 36 is in the neutral position. When the shift gear sleeve 36 moves to the left and combines with the first gear driving gear 37, it drives the first gear driving gear 37 to rotate synchronously and drives the output shaft 4 to rotate synchronously through the first gear driving gear 37. When the shift gear sleeve 36 moves to the right and combines with the second gear driving gear 38, it drives the second gear driving gear 38 to rotate synchronously and drives the output shaft 4 to rotate synchronously through the second gear driving gear 38. The power on the two intermediate shafts 2 is coupled to the output shaft 4 through the first gear driving gear 37 or the second gear driving gear 27, and the power on the two intermediate shafts 2 is coupled and transmitted to the output shaft 4.

[0026] The output shaft 4 is coaxially fixed with a first gear driven gear 41 meshing with the first gear driving gear 37 and a second gear driven gear 42 meshing with the second gear driving gear 38. When the shifting gear sleeve 36 is combined with the first gear driving gear 37, the power of the intermediate shaft 32 is transmitted to the output shaft 4 via the first gear driving gear 37 and the first gear driven gear 41, and the output shaft 4 transmits the power to the planetary gear 5, and the power drives the driving wheel 100 to move after the planetary gear 5 decelerates and increases the torque, forming a first gear power drive; when the shifting gear sleeve 37 is combined with the second gear driving gear 38, the power of the intermediate shaft 32 is transmitted to the output shaft 4 via the second gear driving gear 38 and the second gear driven gear 42, and the output shaft 4 transmits the power to the planetary gear 5, and the power drives the driving wheel 100 to move after the planetary gear 5 decelerates and increases the torque, forming a second gear power drive.

[0027] Among them, the planetary gear shaft 70 of the planetary carrier 7 is coaxially fixed with a planetary gear 1 71 and a planetary gear 2 72 whose outer diameter is smaller than that of the planetary gear 1 71. The planetary gear 1 71 is meshed with the sun gear 6, and the planetary gear 2 72 is meshed with the inner ring gear 8. The planetary gear 1 71 is meshed with the sun gear 6 and rotates synchronously with the sun gear 6 to drive the planetary gear shaft 70 on the planetary carrier 7 to rotate, so that the planetary gear 2 72 rotates synchronously, and the planetary gear 2 72 drives the ring gear 8 to rotate, thereby driving the driving wheel 100 to rotate synchronously. The arrangement of the planetary gear 1 71 and the planetary gear 2 30 enables the planetary gear set to use the ring gear 8 as the power output end, and can effectively increase the speed ratio of the planetary gear set, improve the deceleration and torque increase characteristics, so as to meet the driving requirements of large torque under heavy load conditions.

[0028] The output shaft 4 and the sun gear 6 are integrally formed, the planet carrier 7 is fixed at the rear side of the gearbox housing 9, the planetary gear shaft 70 is arranged forward and parallel to the output shaft 4, and is rotatably mounted between the planetary gear carrier 7 and the gearbox housing 9. The output shaft 4 and the sun gear 6 are integrally formed, which can effectively improve the strength of the output shaft 4 and reduce the axial dimension of the connection between the output shaft 4 and the sun gear 6. The planetary gear carrier 7 is fixed at the rear side of the gearbox housing 9, and the planetary gear shaft 70 is arranged at the front side of the planetary gear carrier 7, so that the planetary gear 2 72 is arranged at the front side of the planetary gear carrier 7. The planetary gear 2 72 can mesh with the gear ring 8 arranged on the outer periphery of the gearbox housing 9, effectively shortening the axial dimension of the connection between the planetary gear 5 and the gearbox, forming a driving assembly with a small axial dimension, a compact structure and coaxially connected to the driving wheel, reducing the requirements for the installation space and facilitating the layout.

[0029] The present invention also protects a driving method for a heavy truck, wherein the driving wheels 100 of the heavy truck are equipped with the above-mentioned dual-motor wheel-side drive assembly, which is characterized in that: According to the load and operating conditions of the heavy truck, the number of motors 1 driven in the dual-motor wheel-side drive assembly and the gear position of the two-speed transmission mechanism 3 on each driving wheel are adjusted; When the heavy truck is on a light-load flat road, each driving wheel is driven by a single motor 1, and the two-speed transmission mechanism 3 is shifted to a high-speed gear, forming a light-load moving mode of the heavy truck; When the heavy truck is in a light-load climbing condition, each driving wheel is driven by a single motor 1, and the two-speed transmission mechanism 3 is shifted to a low-speed gear, forming a light-load climbing mode of a heavy-load loader; When the heavy-duty truck is in a heavy-load climbing condition, two motors 1 are used to drive each driving wheel, and the two-speed transmission mechanism 3 is shifted to a low-speed gear, forming a heavy-load climbing mode of a heavy-duty loader; When the heavy-duty truck is under heavy-load flat road working condition, two motors 1 are used to drive each driving wheel, and the two-speed transmission mechanism 3 is shifted to high gear, forming a heavy-load moving mode of a heavy-duty loader; When a heavy truck is on a muddy or turning road, the number of motors 1 driven in the dual-motor wheel-side drive assembly on each drive wheel and the gear position of the two-speed transmission mechanism 3 are controlled separately, so that the output torque and speed of the left and right aligned drive wheels are unequal, forming an electronic differential.

[0030] The driving method described above can adjust the number of motors transmitted in the dual-motor wheel-side drive assembly and the gear position of the two-speed transmission mechanism 3 according to the load and operating conditions of the heavy-duty truck. When the heavy-duty truck is under light-load flat road conditions, a single motor is selected for transmission, and the two-speed transmission mechanism 3 is shifted to a high gear, forming a light-load moving mode for the heavy-duty truck; when the heavy-duty truck is under light-load climbing conditions, a single motor is selected for transmission, and the two-speed transmission mechanism is shifted to a low gear, forming a light-load climbing mode for the heavy-duty loader; when the heavy-duty truck is under heavy-load climbing conditions, the two motors 1 are synchronously transmitted to the input assembly 2, and the two-speed transmission mechanism 3 is shifted to a low gear, forming a heavy-load climbing mode for the heavy-duty loader; When the heavy-duty truck is on a heavy-load flat road, the two motors 1 transmit power to the input component 2 synchronously, and the two-speed transmission mechanism 3 is shifted to a high-speed gear, forming a heavy-duty mobile mode of the heavy-duty loader, taking into account the power requirements of various working conditions, realizing the switching of dual-motor and single-motor drive modes, achieving power redundancy and dynamic distribution, making the motor work in a high-efficiency area, and reducing energy consumption. When the heavy-duty truck is on a muddy or turning road, the number of motors transmitted in the dual-motor wheel-side drive assembly on each drive wheel and the gear position of the two-speed transmission mechanism are controlled separately, so that the output torque and speed of the left and right aligned drive wheels are unequal, forming an electronic differential, improving the adaptability to complex terrain, and achieving the best match between the power and economy of the whole vehicle.

[0031] Among them, “shifting the two-speed transmission mechanism to the low gear” means that the shift gear sleeve 36 moves to the left and combines with the first gear driving gear 37 , and “shifting the two-speed transmission mechanism to the high gear” means that the shift gear sleeve 36 moves to the right and combines with the second gear driving gear 38 . In the initial state, the shift gear sleeve 36 is located between the first gear driving gear 36 and the second gear driving gear 38, and is not combined with either of them. At this time, the shift gear 36 is in the neutral position. When the shift gear sleeve 36 moves to the left and combines with the first gear driving gear 37, it drives the first gear driving gear 37 to rotate synchronously, and the first gear driving gear 37 drives the first gear driven gear 41 to rotate synchronously, coupling the power of the two intermediate shafts 32 to the output shaft 4, and the output shaft 4 transmits the power to the planetary gear 5, and after the planetary gear 5 is decelerated and torque-increased, it is transmitted to the drive wheel 100, forming a first gear power drive; when the shift gear sleeve 36 moves to the right and combines with the second gear driving gear 38, it drives the second gear driving gear 38 to rotate synchronously, and the second gear driving gear 38 drives the second gear driven gear 42 to rotate synchronously, coupling the power of the two intermediate shafts 32 to the output shaft 4, and the output shaft 4 transmits the power to the planetary gear 5, and after the planetary gear 5 is decelerated and torque-increased, it is transmitted to the drive wheel 100, forming a first gear power drive.

[0032] The above is a complete description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. A dual-motor wheel-side drive assembly, including a gearbox and a planetary gearbox connected to the gearbox and driving the drive wheel to move, characterized in that: The gearbox includes two motors, an input assembly that couples the power of the two motors, a two-speed transmission mechanism that is coaxially connected to the input assembly and has a two-speed transmission function, and an output shaft connected to the two-speed transmission mechanism. The output shaft extends into the two-speed transmission mechanism and is coaxially aligned with the input assembly. The two motors are symmetrically arranged with the axis of the output shaft as the center, the sun gear of the planetary row is fixed to the output shaft, the planetary carrier is fixed to the gearbox housing, and the ring gear is supported on the outer periphery of the gearbox housing through a bearing and is fixed to the drive wheel.

2. The dual-motor wheel-side drive assembly according to claim 1 is characterized in that: The input assembly includes an input shaft 1 connected to one motor, an input shaft 2 connected to another motor, and a constant meshing shaft respectively meshing with the input shaft 1 and the input shaft 2, and the constant meshing shaft is connected to the input end of the two-speed transmission mechanism.

3. The dual-motor wheel-side drive assembly according to claim 2 is characterized in that: The two-speed transmission mechanism includes an intermediate gear coaxially connected to the constant meshing shaft through a spline, an intermediate shaft meshing with the intermediate gear, and a shift assembly mounted on the intermediate shaft. There are two intermediate shafts and they are symmetrically distributed on both sides of the constant meshing shaft. The shift assemblies on the two intermediate shafts are respectively meshed with the output shaft.

4. The dual-motor wheel-side drive assembly according to claim 3 is characterized in that: The shift assembly comprises a constant meshing gear coaxially fixed on the intermediate shaft and meshing with the intermediate gear, a shift gear coaxially fixed on the intermediate shaft, a shift gear sleeve axially slidably mounted on the shift gear, a first gear driving gear and a second gear driving gear rotatably mounted on the intermediate shaft through an idler shaft, the shift gear sleeve moves to the left and engages with the first gear driving gear, and moves to the right and engages with the second gear driving gear, and the first gear driving gear and the second gear driving gear are respectively connected to the output shaft.

5. The dual-motor wheel-side drive assembly according to claim 4 is characterized in that: 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.

6. The dual-motor wheel-side drive assembly according to claim 1, characterized in that: A planetary gear 1 and a planetary gear 2 whose outer diameter is smaller than that of the planetary gear 1 are coaxially fixed on the planetary gear shaft of the planetary carrier; the planetary gear 1 is meshed with the sun gear, and the planetary gear 2 is meshed with the inner gear ring.

7. The dual-motor wheel-side drive assembly according to claim 1, characterized in that: The output shaft and the sun gear are integrally formed, the planet carrier is fixed to the rear side of the gearbox housing, the planetary gear shaft is arranged forward and parallel to the output shaft, and is rotatably mounted between the planet carrier and the gearbox housing.

8. A driving method for a heavy truck, wherein the driving wheels of the heavy truck are all equipped with the dual-motor wheel-side drive assembly according to any one of claims 1 to 7, characterized in that: According to the load and operating conditions of the heavy truck, the number of motors driven in the dual-motor wheel-side drive assembly and the gear position of the two-speed transmission mechanism on each drive wheel are adjusted; When a heavy truck is on a light-load flat road, each drive wheel is driven by a single motor, and the two-speed transmission mechanism is shifted to high gear, forming a light-load moving mode for the heavy truck; When a heavy-duty truck is in a light-load climbing condition, each drive wheel is driven by a single motor, and the two-speed transmission mechanism is shifted to the low gear, forming a light-load climbing mode for a heavy-duty loader; When a heavy-duty truck is in a heavy-load climbing condition, two motors are used on each driving wheel to drive, and the two-speed transmission mechanism is shifted to the low gear, forming a heavy-load climbing mode of a heavy-duty loader; When a heavy-duty truck is on a heavy-load flat road, two motors are used to drive each driving wheel, and the two-speed transmission mechanism is shifted to high gear, forming a heavy-load moving mode of a heavy-duty loader; When a heavy truck is on a muddy or turning road, the number of motors transmitted in the dual-motor wheel-side drive assembly on each drive wheel and the gear position of the two-speed transmission mechanism are controlled separately, so that the output torque and speed of the left and right aligned drive wheels are unequal, forming an electronic differential.

9. The driving method of a heavy truck according to claim 8, characterized in that: "Shifting the two-speed transmission mechanism to a low gear" means that the shift gear sleeve moves to the left and engages with the first gear driving gear, and "shifting the two-speed transmission mechanism to a high gear" means that the shift gear sleeve moves to the right and engages with the second gear driving gear.

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