CN117021920A - Dual-motor electric drive axle power transmission system - Google Patents

Dual-motor electric drive axle power transmission system Download PDF

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Publication number
CN117021920A
CN117021920A CN202310985197.8A CN202310985197A CN117021920A CN 117021920 A CN117021920 A CN 117021920A CN 202310985197 A CN202310985197 A CN 202310985197A CN 117021920 A CN117021920 A CN 117021920A
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CN
China
Prior art keywords
gear
assembly
motor
output
driving gear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310985197.8A
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Chinese (zh)
Inventor
田飞跃
高刚刚
胡烜华
杨博华
郭鸿瑞
冯勋勋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shaanxi Hande Axle Co Ltd
Original Assignee
Shaanxi Hande Axle Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shaanxi Hande Axle Co Ltd filed Critical Shaanxi Hande Axle Co Ltd
Priority to CN202310985197.8A priority Critical patent/CN117021920A/en
Publication of CN117021920A publication Critical patent/CN117021920A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/06—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing
    • B60K17/08—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of change-speed gearing of mechanical type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Structure Of Transmissions (AREA)

Abstract

The invention relates to a double-motor electric drive bridge power transmission system, which comprises a first motor, a second motor, a transmission assembly, a speed reducer assembly and a differential mechanism assembly, wherein the first motor is connected with the second motor; one end of the differential mechanism assembly is provided with a first motor and a speed changer assembly; the other end of the differential mechanism assembly is provided with a second motor and a speed reducer assembly; through the gear shifting action of the sliding meshing sleeve, the power output by the first motor is subjected to three-level two-gear speed-changing torsion through the transmission assembly, the power is transmitted to the differential mechanism assembly, the power output by the second motor is transmitted to the differential mechanism assembly through the speed reducer assembly, the differential mechanism assembly realizes power confluence through the output driven gear h and respectively outputs from the half shafts, and the half shafts transmit the power to wheels connected with the half shafts, so that the vehicle is driven to run. The invention has the advantages of short axial width, compact structure and light weight, saves space, is convenient for the whole vehicle to be arranged, simultaneously ensures the power of the gear shifting process to be uninterrupted by double-motor arrangement, improves the motor efficiency and meets the power requirement of large-tonnage vehicle types.

Description

Dual-motor electric drive axle power transmission system
Technical Field
The invention relates to the technical field of new energy commercial vehicles, in particular to a power transmission system of a double-motor electric drive axle.
Background
The new energy vehicle driven by electric power is a future development direction, wherein, the drive axle is used as a common drive mechanism and is widely applied to the technical field of electric vehicles, and in order to adapt to the technical development of the new energy electric vehicles, the electric drive axle driven by a drive motor appears in the market.
However, the existing electric drive bridge power system adopts a single driving motor, the power cannot meet the power requirement of a large-tonnage vehicle type, the electric drive bridge scheme of the power transmission system adopting a multi-gear transmission has the problem of gear shifting power interruption, and the power transmission system has the advantages of multiple power transmission links, long transmission chain, low transmission efficiency, large volume and difficult arrangement; meanwhile, the complex gear shifting scheme has higher requirements on the electric control strategy.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a double-motor electric drive bridge power transmission system which adopts a scheme of carrying out two-gear speed change through a speed changer assembly and single-stage speed reduction arrangement of the speed changer assembly.
In order to solve the problems in the background art, the invention is realized by the following technical scheme:
a power transmission system of a double-motor electric drive axle comprises a first motor, a second motor, a transmission assembly, a speed reducer assembly and a differential mechanism assembly; one end of the differential mechanism assembly is provided with the first motor and the transmission assembly; the other end of the differential mechanism assembly is provided with the second motor and the speed reducer assembly;
the working principle of the power transmission system of the double-motor electro-drive bridge is as follows: through the gear shifting action of the sliding meshing sleeve arranged on the transmission assembly, the power output by the first motor is subjected to three-level two-gear speed-changing and torque-regulating through the transmission assembly, the power is transmitted to the differential assembly, the power output by the second motor is subjected to speed-reducing and torque-increasing transmission through the speed reducer assembly, the differential assembly realizes power confluence through the output driven gear h and respectively outputs from half shafts arranged on the differential assembly, and the half shafts transmit the power to wheels connected with the half shafts, so that the vehicle is driven to run
Preferably, the transmission assembly comprises a gear shifting assembly and a plurality of parallel shafts and gear pair mechanisms; the plurality of parallel shafts comprise a first transmission shaft, a second transmission shaft and a third transmission shaft; the gear pair mechanism comprises an input gear pair, two sets of gear shifting gear pairs and an output gear pair; the gear shifting assembly comprises a combined gear A, a combined gear B and a sliding meshing sleeve;
the input gear pair comprises an input driving gear a and an input driven gear b, and the input driven gear b is meshed with the input driving gear a; the gear shifting pair comprises a gear shifting driving gear c, a gear shifting driven gear d, a gear shifting driving gear e and a gear shifting driven gear f, wherein the gear shifting driving gear c is meshed with the gear shifting driven gear d, and the gear shifting driving gear e is meshed with the gear shifting driven gear f; the output gear pair comprises an output driving gear g and an output driven gear h, and the output driving gear g is meshed with the output driven gear h;
the transmission first shaft is connected with a motor shaft arranged on the first motor through a spline; the transmission one-shaft is provided with the input driving gear a; the transmission two shafts are provided with an input driven gear b; the transmission two shafts are sequentially sleeved with a gear shifting driving gear e and a gear shifting driving gear c in a hollow mode, a combination gear A is arranged on the right side of the gear shifting driving gear e, and a combination gear B is arranged on the left side of the gear shifting driving gear c; the sliding meshing sleeve is connected with the transmission two shafts through a spline and is positioned between the combination gear A and the combination gear B, and the gear shifting driven gear f, the output driving gear g and the gear shifting driven gear d are sequentially arranged on the transmission three shafts;
the speed reducer assembly comprises a speed reducer first shaft, a speed reducer second shaft, an input driving gear i, an input driven gear j and an output driving gear k, wherein the speed reducer first shaft is connected with the second motor through a spline, and the input driving gear i is fixedly connected with the speed reducer first shaft; the input driven gear j and the output driving gear k are fixedly connected with the two shafts of the speed reducer, the input driving gear i is meshed with the input driven gear j, and the output driving gear k is meshed with the output driven gear h;
the differential assembly shell is provided with the output driven gear h, and two sides of the differential assembly are provided with half shafts.
Preferably, the transmission assembly power transmission path includes: the sliding meshing sleeve moves leftwards and is in meshing connection with the combined gear A, and power output by the first motor is transmitted to the differential assembly through the input driving gear a, the input driven gear b, the gear shifting driving gear e, the gear shifting driven gear f, the output driving gear g and the output driven gear h to realize three-stage speed reduction;
the sliding meshing sleeve moves rightwards and is in meshing connection with the combined gear B, and power output by the first motor is transmitted to the differential assembly through the input driving gear a, the input driven gear B, the gear shifting driving gear c, the gear shifting driven gear d, the output driving gear g and the output driven gear h, so that three-stage speed reduction is realized.
Preferably, the power transmission route of the speed reducer assembly is that the power output by the second motor is transmitted to the differential assembly through the input driving gear i, the input driven gear j, the output driving gear k and the output driven gear h, so that two-stage speed reduction is realized.
Preferably, the first transmission shaft, the second transmission shaft, the third transmission shaft, the first speed reducer shaft, the second speed reducer shaft and the half shaft are all arranged in parallel.
Preferably, the input driving gear a, the input driven gear b, the gear shifting driving gear c, the gear shifting driving gear e, the gear shifting driven gear f, the output driving gear g, the gear shifting driven gear d, the input driving gear i, the input driven gear j, the output driving gear k and the output driven gear h are helical gears.
Preferably, the gear shifting driving gear c and the gear shifting driving gear e are sleeved on the transmission two shafts through needle bearings.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the transmission assembly is used for carrying out two-gear speed change and the speed reducer assembly is used for carrying out single-stage speed reduction and double-motor arrangement, so that the dynamic requirements of large-tonnage vehicle types can be met.
2. The combined operation of the double motors can ensure that the power is not interrupted in the gear shifting process, effectively improve the efficiency of the driving motor and realize the efficient operation of a power system.
3. The axial width is short, the structure is compact, the weight is light, the space is saved, and the whole vehicle arrangement is convenient.
Drawings
FIG. 1 is a schematic diagram of the front view of the present invention;
FIG. 2 is a cross-sectional view of the transmission assembly of the present invention;
FIG. 3 is a right side view of the present invention;
FIG. 4 is a schematic diagram of the structure of the present invention;
FIG. 5 is a schematic representation of the transmission assembly of the present invention;
FIG. 6 is a schematic transmission diagram of the speed reducer assembly of the present invention;
FIG. 7 is an enlarged view of a portion of FIG. 4 at A;
FIG. 8 is a power transmission route diagram of embodiment 2 of the present invention;
fig. 9 is a power transmission route chart of embodiment 3 of the present invention.
The drawings are marked with the following description:
1. a first motor; 2. a transmission first shaft; 3. an input driving gear a; 11. a transmission two-shaft; 12. inputting a driven gear b; 13. a shift driving gear c; 14. a shift driving gear e; 15. needle roller bearings; 16. sliding engagement sleeve; 17. a combination gear A; 18. a combination gear B; 21. three shafts of the transmission; 22. a gear shifting passive gear f; 23. an output driving gear g; 24. a gear shifting passive gear d; 31. a second motor; 32. a speed reducer is an axle; 33. inputting a driving gear i; 41. a speed reducer two-shaft; 42. inputting a driven gear j; 43. an output driving gear k; 51. a differential assembly; 52. outputting a driven gear h; 53. and a half shaft.
Detailed Description
Example 1
As shown in fig. 1-7, a dual electro-mechanical drive axle powertrain includes a first electric machine 1, a second electric machine 31, a transmission assembly, a reduction gear assembly, and a differential assembly 51; one end of the differential assembly 51 is provided with a first motor 1 and a transmission assembly; the other end of the differential mechanism assembly 51 is provided with a second motor 31 and a speed reducer assembly;
the transmission assembly comprises a gear shifting assembly and a plurality of parallel shafts and gear pair mechanisms; the parallel shafts comprise a first transmission shaft 2, a second transmission shaft 11 and a third transmission shaft 21; the gear pair mechanism comprises an input gear pair, two sets of gear shifting gear pairs and an output gear pair; the gear shifting assembly comprises a combined gear A17, a combined gear B18 and a sliding meshing sleeve 16;
the input gear pair comprises an input driving gear a3 and an input driven gear b12, and the input driven gear b12 is meshed with the input driving gear a3; the gear shifting pair comprises a gear shifting driving gear c13, a gear shifting driven gear d24, a gear shifting driving gear e14 and a gear shifting driven gear f22, wherein the gear shifting driving gear c13 is meshed with the gear shifting driven gear d24, and the gear shifting driving gear e14 is meshed with the gear shifting driven gear f 22; the output gear pair comprises an output driving gear g23 and an output driven gear h52, and the output driving gear g23 is meshed with the output driven gear h 52;
the transmission first shaft 2 is connected with a motor shaft arranged on the first motor 1 through a spline; the transmission primary shaft 2 is provided with an input driving gear a3; the transmission two-shaft 11 is provided with an input driven gear b12; the transmission two shafts 11 are sequentially sleeved with a gear shifting driving gear e14 and a gear shifting driving gear c13, a combination gear A17 is arranged on the right side of the gear shifting driving gear e14, and a combination gear B18 is arranged on the left side of the gear shifting driving gear c 13; the sliding meshing sleeve 16 is connected with the transmission two shaft 11 through a spline and is positioned between the combined gear A17 and the combined gear B18, and the gear-shifting driven gear f22, the output driving gear g23 and the gear-shifting driven gear d24 are sequentially arranged on the transmission three shaft 21;
the speed reducer assembly comprises a speed reducer first shaft 32, a speed reducer second shaft 41, an input driving gear i33, an input driven gear j42 and an output driving gear k43, wherein the speed reducer first shaft 32 is connected with the second motor 31 through a spline, and the input driving gear i33 is fixedly connected with the speed reducer first shaft 32; the input driven gear j42 and the output driving gear k43 are fixedly connected with the speed reducer two shaft 41, the input driving gear i33 is meshed with the input driven gear j42, and the output driving gear k43 is meshed with the output driven gear h 52;
the differential assembly 51 is provided with an output driven gear h52 on the outer casing, and half shafts 53 are provided on both sides of the differential assembly.
The working principle of the power transmission system of the double-motor electric drive axle is as follows: through the gear shifting action of the sliding engagement sleeve 16, the power output by the first motor 1 realizes three-level two-gear speed-changing torque through a transmission assembly, the power is transmitted to the differential assembly 51, the power output by the second motor 31 is reduced in speed and increased in torque through the speed reducer assembly and transmitted to the differential assembly 51, the differential assembly 51 realizes power confluence through the output driven gear h52 and is respectively output from the half shafts 53, and the half shafts 53 transmit the power to wheels connected with the differential assembly, so that the vehicle is driven to run.
The power transmission route of the speed reducer assembly is that the power output by the second motor 31 is transmitted to the differential assembly 51 through the input driving gear i33, the input driven gear j42, the output driving gear k43 and the output driven gear h52, so that two-stage speed reduction is realized.
The transmission primary shaft 2, the transmission secondary shaft 11, the transmission three shaft 21, the transmission primary shaft 32, the transmission secondary shaft 41 and the half shaft 53 are all arranged in parallel.
The input driving gear a3, the input driven gear b12, the gear shifting driving gear c13, the gear shifting driving gear e14, the gear shifting driven gear f22, the output driving gear g23, the gear shifting driven gear d24, the input driving gear i33, the input driven gear j42, the output driving gear k43 and the output driven gear h52 are all helical gears.
The gear shifting driving gear c13 and the gear shifting driving gear e14 are arranged on the transmission two shafts 11 in a hollow mode through needle bearings 15.
Example two
The transmission assembly power transmission path includes: the sliding engagement sleeve 16 moves leftwards, is in engagement connection with the combination gear A17, and power output by the first motor 1 is transmitted to the differential assembly 51 through the input driving gear a3, the input driven gear b12, the gear shifting driving gear e14, the gear shifting driven gear f22, the output driving gear g23 and the output driven gear h52, so that three-stage speed reduction is realized.
Example III
The sliding engagement sleeve 16 moves rightwards, is in engagement connection with the combined gear B18, and power output by the first motor 1 is transmitted to the differential assembly through the input driving gear a3, the input driven gear B12, the gear shifting driving gear c13, the gear shifting driven gear d24, the output driving gear g23 and the output driven gear h52, so that three-stage speed reduction is realized.

Claims (7)

1. The double-motor electric drive axle power transmission system is characterized by comprising a first motor (1), a second motor (31), a transmission assembly, a speed reducer assembly and a differential mechanism assembly (51); one end of the differential mechanism assembly (51) is provided with the first motor (1) and the speed changer assembly; the other end of the differential mechanism assembly (51) is provided with the second motor (31) and the speed reducer assembly;
the working principle of the power transmission system of the double-motor electro-drive bridge is as follows: through the gear shifting action of the sliding meshing sleeve (16) arranged on the transmission assembly, the power output by the first motor (1) is subjected to three-level two-gear speed-changing torque adjustment through the transmission assembly, the power is transmitted to the differential assembly (51), the power output by the second motor (31) is subjected to speed-reducing torque-increasing transmission through the speed reducer assembly and is transmitted to the differential assembly (51), the differential assembly (51) realizes power confluence through the output driven gear h (52) and respectively outputs from the half shafts (53) arranged on the differential assembly (51), and the half shafts (53) transmit the power to the wheels connected with the half shafts, so that the vehicle is driven to run.
2. The dual electro-mechanical drive axle driveline of claim 1, wherein the transmission assembly comprises a shift assembly and a plurality of parallel shafts, gear pair mechanisms; the parallel shafts comprise a transmission first shaft (2), a transmission second shaft (11) and a transmission three shaft (21); the gear pair mechanism comprises an input gear pair, two sets of gear shifting gear pairs and an output gear pair; the gear shifting assembly comprises a combined gear A (17), a combined gear B (18) and a sliding meshing sleeve (16);
the input gear pair comprises an input driving gear a (3) and an input driven gear b (12), and the input driven gear b (12) is meshed with the input driving gear a (3); the gear shifting pair comprises a gear shifting driving gear c (13) and a gear shifting driven gear d (24), a gear shifting driving gear e (14) and a gear shifting driven gear f (22), wherein the gear shifting driving gear c (13) is meshed with the gear shifting driven gear d (24), and the gear shifting driving gear e (14) is meshed with the gear shifting driven gear f (22); the output gear pair comprises an output driving gear g (23) and an output driven gear h (52), and the output driving gear g (23) is meshed with the output driven gear h (52);
the transmission one-shaft (2) is connected with a motor shaft arranged on the first motor (1) through a spline; the transmission one-shaft (2) is provided with the input driving gear a (3); the transmission two-shaft (11) is provided with an input driven gear b (12); the transmission two shafts (11) are sequentially sleeved with a gear shifting driving gear e (14) and a gear shifting driving gear c (13), a combination gear A (17) is arranged on the right side of the gear shifting driving gear e (14), and a combination gear B (18) is arranged on the left side of the gear shifting driving gear c (13); the sliding meshing sleeve (16) is connected with the transmission two shaft (11) through a spline and is positioned between the combined gear A (17) and the combined gear B (18), and the gear shifting driven gear f (22), the output driving gear g (23) and the gear shifting driven gear d (24) are sequentially arranged on the transmission three shaft (21);
the speed reducer assembly comprises a speed reducer first shaft (32), a speed reducer second shaft (41), an input driving gear i (33), an input driven gear j (42) and an output driving gear k (43), wherein the speed reducer first shaft (32) is connected with the second motor (31) through a spline, and the input driving gear i (33) is fixedly connected with the speed reducer first shaft (32); the input driven gear j (42) and the output driving gear k (43) are fixedly connected with the speed reducer two shaft (41), the input driving gear i (33) is meshed with the input driven gear j (42), and the output driving gear k (43) is meshed with the output driven gear h (52);
the differential mechanism assembly (51) is provided with an output driven gear h (52) on the outer shell, and half shafts (53) are arranged on two sides of the differential mechanism assembly.
3. The dual electro-mechanical drive axle driveline of claim 2, wherein the transmission assembly power transfer path comprises: the sliding meshing sleeve (16) moves leftwards and is meshed with the combined gear A (17), and power output by the first motor (1) is transmitted to the differential mechanism assembly (51) through the input driving gear a (3), the input driven gear b (12), the gear shifting driving gear e (14), the gear shifting driven gear f (22), the output driving gear g (23) and the output driven gear h (52) to realize three-stage speed reduction;
the sliding meshing sleeve (16) moves rightwards to be meshed with the combined gear B (18), and power output by the first motor (1) is transmitted to the differential assembly through the input driving gear a (3), the input driven gear B (12), the gear shifting driving gear c (13), the gear shifting driven gear d (24), the output driving gear g (23) and the output driven gear h (52), so that three-stage speed reduction is realized.
4. The double-motor electric drive axle power transmission system according to claim 2, characterized in that the transmission route of the reducer assembly is that the power output by the second motor (31) is transmitted to the differential assembly (51) through the input driving gear i (33), the input driven gear j (42), the output driving gear k (43) and the output driven gear h (52), so as to realize two-stage reduction.
5. A double electro-mechanical drive axle driveline as claimed in claim 2, wherein the variator primary shaft (2), the variator secondary shaft (11), the variator triaxial (21), the reducer primary shaft (32), the reducer secondary shaft (41) and the half shaft (53) are all arranged in parallel.
6. The double electro-mechanical drive axle driveline of claim 2, wherein the input driving gear a (3), the input driven gear b (12), the shift driving gear c (13), the shift driving gear e (14), the shift driven gear f (22), the output driving gear g (23), the shift driven gear d (24), the input driving gear i (33), the input driven gear j (42), the output driving gear k (43) and the output driven gear h (52) are helical gears.
7. The double-motor drive axle power transmission system according to claim 6, wherein the gear shifting driving gear c (13) and the gear shifting driving gear e (14) are arranged in a hollow mode on the transmission two shafts (11) through needle bearings (15).
CN202310985197.8A 2023-08-07 2023-08-07 Dual-motor electric drive axle power transmission system Pending CN117021920A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310985197.8A CN117021920A (en) 2023-08-07 2023-08-07 Dual-motor electric drive axle power transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310985197.8A CN117021920A (en) 2023-08-07 2023-08-07 Dual-motor electric drive axle power transmission system

Publications (1)

Publication Number Publication Date
CN117021920A true CN117021920A (en) 2023-11-10

Family

ID=88640626

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310985197.8A Pending CN117021920A (en) 2023-08-07 2023-08-07 Dual-motor electric drive axle power transmission system

Country Status (1)

Country Link
CN (1) CN117021920A (en)

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