Dual motor drive system and agricultural machine

Abstract

The utility model discloses a double motor transmission system and agricultural machinery, including axle drive shaft, first motor shaft, second motor shaft, operation transmission shaft and intermediate adapter axle, and operation transmission shaft is established in the one side of first motor away from first motor shaft and is connected operation device and first motor through first clutch device, and the planetary gear mechanism is equipped with on intermediate adapter axle, and the first gear group of meshing transmission is equipped between intermediate adapter axle and second motor shaft, and the sun gear of planetary gear mechanism is established on intermediate adapter axle, and the ring gear is transmission connection with first motor shaft, and the planetary carrier is coaxial with intermediate adapter axle, and the first gear shift device is equipped between planetary carrier and axle drive shaft, thereby make can satisfy the working condition of stable operation output speed and big traction force walking simultaneously.

Description

Technical Field

[0001] This utility model belongs to the field of dual-motor transmission technology, and in particular relates to a dual-motor transmission system and agricultural machinery. Background Technology

[0002] Traditional tractors mostly use diesel engines, which suffer from problems such as high noise, heavy pollution, inconvenient operation due to multiple gears, low efficiency, and high fuel waste and costs. Therefore, energy-saving and environmentally friendly new energy tractors have become a development trend.

[0003] Currently, due to the driving requirements for both driving and operation, new energy tractors are generally equipped with a dual-motor parallel shaft multi-speed structure, but they cannot simultaneously meet the working conditions of stable operating output speed and high traction driving, or although they can meet the requirements at the same time, the driving and operating speeds cannot be decoupled. Utility Model Content

[0004] To address the aforementioned defects or deficiencies, this utility model provides a dual-motor transmission system and agricultural machinery, aiming to solve the technical problem that conventional parallel shaft solutions cannot simultaneously meet the requirements of stable operating output speed and high traction travel, or although they can meet these requirements simultaneously, the travel and operating speeds cannot be decoupled.

[0005] To achieve the above objectives, the first aspect of this utility model provides a dual-motor transmission system, wherein the dual-motor transmission system includes an axle drive shaft, a first motor shaft, a second motor shaft, a working transmission shaft, and an intermediate transfer shaft; the axle drive shaft is connected to an axle device; the first motor shaft is connected to a first motor; the second motor shaft is connected to a second motor; the working transmission shaft is located on the side of the first motor away from the first motor shaft and is connected to the working device and the first motor through a first clutch device; a planetary gear mechanism is provided on the intermediate transfer shaft, a first gear set is provided between the intermediate transfer shaft and the second motor shaft for meshing transmission, the sun gear of the planetary gear mechanism is located on the intermediate transfer shaft, the ring gear of the planetary gear mechanism is connected to the first motor shaft for transmission, the planet carrier of the planetary gear mechanism is coaxially arranged with the intermediate transfer shaft, and a first gear shifting device is provided between the planet carrier and the axle drive shaft.

[0006] In one embodiment of the present invention, the first gear switching device is configured to switch between two gears. The first gear switching device includes a second gear set, a third gear set, and a first engagement device. The second gear set and the third gear set are respectively staggered between the planetary carrier and the axle drive shaft and are both configured to mesh. The first engagement device is located on the planetary carrier and is used to select one of the second gear set and the third gear set to engage or to disengage from both.

[0007] In one embodiment of this utility model, the intermediate adapter shaft includes a first intermediate shaft and a second intermediate shaft arranged in parallel. A planetary gear mechanism is provided between the first intermediate shaft and the first motor shaft, and a first gear set is provided between the first intermediate shaft and the second motor shaft. The sun gear of the planetary gear mechanism is located on the first intermediate shaft. The planet carrier of the planetary gear mechanism is coaxially arranged with the first intermediate shaft. A second gear set and a third gear set are provided between the planet carrier and the second intermediate shaft. A fifth gear set is provided for meshing transmission between the second intermediate shaft and the axle drive shaft.

[0008] In one embodiment of the present invention, the first gear set and the planetary gear mechanism are respectively disposed at opposite ends of the first intermediate shaft, and the second motor shaft is disposed on the side of the first motor shaft away from the first motor.

[0009] In one embodiment of the present invention, the planetary carrier includes a disk portion and a rod portion arranged sequentially along the axial direction of the first intermediate shaft, the planetary gears of the planetary gear mechanism are disposed on the disk portion, and a second gear set and a third gear set are provided between the rod portion and the second intermediate shaft.

[0010] In one embodiment of the present invention, a second gear switching device is further provided between the planet carrier and the second intermediate shaft. The second gear switching device includes a fourth gear set and a second engagement device. The fourth gear set is meshed and driven between the planet carrier and the second intermediate shaft. The second engagement device is provided on the planet carrier and is used to engage or disengage the fourth gear set.

[0011] In one embodiment of this utility model, the driving gears of the second gear set, the third gear set, and the fourth gear set are sequentially loosely mounted on the planet carrier, and the first engagement device is located between the second driving gear of the second gear set and the third driving gear of the third gear set, and the second engagement device is located on the side of the fourth driving gear of the fourth gear set away from the third driving gear.

[0012] In one embodiment of this utility model, a sixth driving gear is provided on the first motor shaft. The sixth driving gear is connected to the gear ring of the planetary gear mechanism. The inner and outer sides of the gear ring are respectively provided with an inner meshing part and an outer meshing part. The inner meshing part meshes with the planetary gears provided on the planet carrier, and the outer meshing part meshes with the sixth driving gear.

[0013] In one embodiment of this utility model, all the engagement devices are configured as one of a gear sleeve, a synchronizer, and a sliding sleeve.

[0014] In one embodiment of the present invention, the first gear set includes a first driving gear fixedly connected to the second motor shaft, and a first driven gear fixedly connected to the intermediate adapter shaft and meshing with the first driving gear.

[0015] In one embodiment of the present invention, the dual-motor transmission system further includes a brake shaft, on which a parking brake and a parking drive gear are provided. The parking drive gear meshes with a driven gear on the axle drive shaft for transmission.

[0016] To achieve the above objectives, a second aspect of this utility model provides an agricultural machine, wherein the agricultural machine includes the dual-motor transmission system described above.

[0017] Through the above technical solution, the dual-motor drive system provided by this utility model has the following beneficial effects: When using the aforementioned dual-motor transmission system, it includes an axle drive shaft, a first motor shaft, a second motor shaft, a working transmission shaft, and an intermediate transfer shaft. The working transmission shaft is located on the side of the first motor opposite to the first motor shaft and connects the working device and the first motor via a first clutch device. A planetary gear mechanism is mounted on the intermediate transfer shaft, and a first gear set meshes between the intermediate transfer shaft and the second motor shaft. The sun gear of the planetary gear mechanism is located on the intermediate transfer shaft, the ring gear is connected to the first motor shaft, and the planet carrier is coaxially arranged with the intermediate transfer shaft. The planet carrier is also connected to the axle drive shaft. A first gear shifting device is provided. This invention, through the addition of an intermediate transfer shaft and the arrangement of the first gear set and planetary gear mechanism on the intermediate transfer shaft, allows the first and second motors to perform power coupling and speed decoupling drive of the axle device via the planetary gear mechanism. This enables the simultaneous satisfaction of stable operating output speed and high traction travel conditions. Furthermore, the first gear shifting device between the planetary carrier of the planetary gear mechanism and the axle drive shaft allows for gear switching between the two motors in coupled drive mode. In addition, this invention significantly simplifies the structure, reduces production difficulty, and improves reliability.

[0018] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings: Figure 1 This is a schematic diagram of the structure of the dual-motor drive system according to the first embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of the dual-motor drive system according to the second embodiment of this utility model; Figure 3This is a partial structural schematic diagram of a dual-motor drive system according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 100. Axle drive shaft; 101. Front axle assembly; 102. Rear axle assembly; 200. First motor shaft; 201. First motor; 210. Sixth drive gear; 300. Second motor shaft; 301. Second motor; 310. First gear set; 311. First drive gear; 312. First driven gear; 400. Working transmission shaft; 401. Working device; 410. First clutch device; 420. Transmission shaft 1; 430. Transmission shaft 2; 440. Torque-increasing gear set; 500. Intermediate adapter shaft; 510. First intermediate shaft; 520. Second intermediate shaft; 530. Second gear set; 531. Second drive gear. 532, Second driven gear; 540, Third gear set; 541, Third driving gear; 542, Third driven gear; 550, Fourth gear set; 551, Fourth driving gear; 552, Fourth driven gear; 560, Fifth gear set; 561, Fifth driving gear; 562, Fifth driven gear; 600, Planetary gear mechanism; 610, Sun gear; 620, Planet gears; 630, Planet carrier; 631, Disc; 632, Rod; 640, Ring gear; 650, First engagement device; 660, Second engagement device; 700, Brake shaft; 710, Parking brake; 720, Parking drive gear. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0022] The dual-motor drive system and agricultural machinery of this utility model are described below with reference to the accompanying drawings.

[0023] like Figures 1 to 3 As shown, this utility model provides a dual-motor drive system, wherein the dual-motor drive system includes: The axle drive shaft 100 is connected to the axle assembly; The first motor shaft 200 is connected to the first motor 201; The second motor shaft 300 is connected to the second motor 301; The working drive shaft 400 is located on the side of the first motor 201 away from the first motor shaft 200 and is connected to the working device 401 and the first motor 201 through the first clutch device 410; An intermediate adapter shaft 500 is provided, on which a planetary gear mechanism 600 is provided. A first gear set 310 is provided between the intermediate adapter shaft 500 and the second motor shaft 300 for meshing transmission. The sun gear 610 of the planetary gear mechanism 600 is provided on the intermediate adapter shaft 500. The gear ring 640 of the planetary gear mechanism 600 is connected to the first motor shaft 200 for transmission. The planet carrier 630 of the planetary gear mechanism 600 is coaxially arranged with the intermediate adapter shaft 500. A first gear shifting device is provided between the planet carrier 630 and the axle drive shaft 100.

[0024] When using the aforementioned dual-motor transmission system, it includes an axle drive shaft 100, a first motor shaft 200, a second motor shaft 300, a working transmission shaft 400, and an intermediate transfer shaft 500. The working transmission shaft 400 is located on the side of the first motor 201 away from the first motor shaft 200 and connects the working device 401 and the first motor 201 through a first clutch device 410. The intermediate transfer shaft 500 is equipped with a planetary gear mechanism 600, and a first gear set 310 meshes with the second motor shaft 300. The sun gear 610 of the planetary gear mechanism 600 is located on the intermediate transfer shaft 500, the ring gear 640 is connected to the first motor shaft 200, and the planet carrier 630 is connected to the intermediate transfer shaft 500. The axle 500 is coaxially arranged, and a first gear shifting device is provided between the planetary carrier 630 and the axle drive shaft 100. This invention, through the addition of an intermediate transition shaft 500 and the arrangement of the first gear set 310 and the planetary gear mechanism 600 on the intermediate transition shaft 500, allows the first motor 201 and the second motor 301 to perform power coupling and speed decoupling drive of the axle device through the planetary gear mechanism 600. This enables the simultaneous satisfaction of stable operating output speed and high traction travel conditions. Furthermore, the first gear shifting device between the planetary carrier 630 of the planetary gear mechanism 600 and the axle drive shaft 100 allows for two-gear switching between the two motors in coupled drive mode. In addition, this invention significantly simplifies the structure, reduces production difficulty, and improves reliability.

[0025] In one embodiment of this utility model, the first gear switching device is configured to switch between two gears. The first gear switching device includes a second gear set 530, a third gear set 540, and a first engagement device 650. The speed ratios of the second gear set 530 and the third gear set 540 are different. The second gear set 530 and the third gear set 540 are staggered between the planetary carrier 630 and the axle drive shaft 100, and both are engaged. The first engagement device 650 is located on the planetary carrier 630 and is used to select one of the second gear set 530 and the third gear set 540 for engagement or to disengage from both. Thus, by controlling the first engagement device 650, two-gear switching can be achieved between the two motors in coupled drive mode. Preferably, the speed ratio of the third gear set 540 can be set to be less than the speed ratio of the second gear set 530.

[0026] Specifically, the aforementioned dual-motor transmission system can have a dual-motor coupled travel first gear mode, a dual-motor coupled travel second gear mode, and a working mode. In the dual-motor coupled travel first gear mode, the first clutch device 410 switches to disconnect the working drive shaft 400 and the first motor 201, and the first engagement device 650 switches to engage with the second gear set 530, so that the power of the first motor 201 and the second motor 301 is coupled on the planet carrier 630 of the planetary gear mechanism 600, and drives the axle drive shaft 100 through the second gear set 530. In the dual-motor coupled travel second gear mode, the first clutch device 410 switches to disconnect the working drive shaft 400 and the first motor 201, and the first engagement device 650 switches to engage with the third gear set 540, so that the power of the first motor 201 and the second motor 301 is coupled on the planet carrier 630 of the planetary gear mechanism 600, and drives the axle drive shaft 100 through the third gear set 540. In the working mode, the first clutch device 410 switches to engage the working drive shaft 400 and the first motor 201, and the first engagement device 650 switches to engage with the second gear set 530 or the third gear set 540, so that the first motor 201 independently drives the working drive shaft 400, and the first motor 201 and the second motor 301 power couple drive the axle drive shaft 100, realizing working while traveling.

[0027] It should be noted that the axle drive shaft 100, the first motor shaft 200, the second motor shaft 300, the working transmission shaft 400, and the intermediate adapter shaft 500 can all be arranged to extend along the front-rear direction of the vehicle frame, and the relative positional relationship between each shaft can be set to meet the power transmission requirements. The axle drive shaft 100 can be connected to one or both of the front axle assembly 101 and the rear axle assembly 102. The output power of the first motor 201 and the second motor 301 can be the same or different. The working transmission shaft 400 is a PTO (Power Take-Off) shaft, and the working device 401 connected to the working transmission shaft 400 includes, but is not limited to, one of a rotary tillage device 401, a seeding device 401, a ditching device 401, and a baling device 401. It should be noted that the axle drive shaft 100, the first motor shaft 200, the second motor shaft 300, the working transmission shaft 400, and the intermediate adapter shaft 500 can all be rotatably mounted on the vehicle frame. Furthermore, the first clutch device 410 includes, but is not limited to, a clutch, and the first engagement device 650 includes, but is not limited to, one of a gear sleeve, a synchronizer, a sliding sleeve, or a sliding gear.

[0028] In one embodiment of this utility model, the intermediate adapter shaft 500 includes a first intermediate shaft 510 and a second intermediate shaft 520 arranged in parallel. A planetary gear mechanism 600 is provided between the first intermediate shaft 510 and the first motor shaft 200, and a first gear set 310 is provided between the first intermediate shaft 510 and the second motor shaft 300. The sun gear 610 of the planetary gear mechanism 600 is disposed on the first intermediate shaft 510. The planet carrier 630 of the planetary gear mechanism 600 is coaxially disposed with the first intermediate shaft 510, specifically, it can be coaxially empty sleeved or coaxially disconnected. A second gear set 530 and a third gear set 540 are provided between the planet carrier 630 and the second intermediate shaft 520. A fifth gear set 560 for meshing transmission is provided between the second intermediate shaft 520 and the axle drive shaft 100. By dividing the intermediate transition shaft 500 into two parallel intermediate shafts, the first intermediate shaft 510 and the second intermediate shaft 520, the two gear sets used for shifting do not need to be located on the axle drive shaft 100, thus reducing the load on the axle drive shaft 100. Furthermore, designing the axle drive shaft 100 to be driven only by the fifth gear set 560 facilitates braking. Specifically, the speed ratio of the fifth gear set 560 is set to be greater than 1, thereby increasing torque. The fifth gear set 560 includes a fifth driving gear 561 located on the second intermediate shaft 520 and a fifth driven gear 562 located on the axle drive shaft 100 and meshing with the fifth driving gear 561. The fifth gear set 560 is located between the first gear set 310 and the planetary gear mechanism 600.

[0029] In one embodiment of this utility model, the first gear set 310 and the planetary gear mechanism 600 are respectively disposed at opposite ends of the first intermediate shaft 510, and the second motor shaft 300 is disposed on the side of the first motor shaft 200 away from the first motor 201. That is, on the vehicle frame, the second motor shaft 300 can be arranged in front of the first motor shaft 200. In addition, the planet carrier 630 of the planetary gear mechanism 600 is arranged at a distance from the first motor shaft 200, so that the second gear set 530 and the third gear set 540 for shifting can be located in the middle area of ​​the vehicle frame, which facilitates spatial layout.

[0030] In one embodiment of this utility model, the planetary carrier 630 includes a disk portion 631 and a rod portion 632 arranged sequentially along the axial direction of the first intermediate shaft 510. The planetary gears 620 of the planetary gear mechanism 600 are disposed on the disk portion 631. Specifically, the outer diameter of the rod portion 632 is smaller than the outer diameter of the disk portion 631. A second gear set 530 and a third gear set 540 are provided between the rod portion 632 and the second intermediate shaft 520. By setting the planetary carrier 630 into two segments with different outer diameters, it is possible to reduce the size of the driving gears of the second gear set 530 and the third gear set 540 while achieving connection with the planetary gears 620 of the planetary gear mechanism 600, and also reduce the weight of the entire planetary carrier 630. Further, both the disk portion 631 and the rod portion 632 are hollow, and the first intermediate shaft 510 extends into the space enclosed by the disk portion 631 and is connected to the sun gear 610.

[0031] In one embodiment of this utility model, a second gear shifting device is further provided between the planetary carrier 630 and the second intermediate shaft 520. The second gear shifting device includes a fourth gear set 550 and a second engagement device 660. The fourth gear set 550 is meshed and driven between the planetary carrier 630 and the second intermediate shaft 520. The second engagement device 660 is disposed on the planetary carrier 630 and is used to engage or disengage the fourth gear set 550. By adding the fourth gear set 550 and the second engagement device 660, the gear positions of the dual-motor coupled drive can be further expanded to adapt to different work requirements. At the same time, it can also make the gear changes smoother and reduce the sense of jerking during gear shifting.

[0032] Preferably, the speed ratio of the fourth gear set 550 is less than that of the third gear set 540. Specifically, the dual-motor transmission system also has a third gear mode for dual-motor coupled travel, and in both the first and second gear modes of dual-motor coupled travel, the second engagement device 660 is disconnected from the fourth gear set 550. In the third gear mode of dual-motor coupled travel, the first clutch device 410 switches to disconnect the connection between the working drive shaft 400 and the first motor 201, the first engagement device 650 switches to disconnect from both the second gear set 530 and the third gear set 540, and the second engagement device 660 switches to engage with the fourth gear set 550, so that the power of the first motor 201 and the second motor 301 is coupled on the planet carrier 630 of the planetary gear mechanism 600, and drives the axle drive shaft 100 through the fourth gear set 550. In addition, the second engagement device 660 includes, but is not limited to, a gear sleeve, a synchronizer, a sliding sleeve, or a sliding gear.

[0033] In one embodiment of this utility model, the driving gears of the second gear set 530, the third gear set 540, and the fourth gear set 550 are sequentially loosely mounted on the planetary carrier 630, that is, the low-speed gear set, the medium-speed gear set, and the high-speed gear set are arranged in sequence, specifically in the direction closer to the gear ring 640. Furthermore, the first engagement device 650 is located between the second driving gear 531 of the second gear set 530 and the third driving gear 541 of the third gear set 540, meaning there is only one first engagement device 650, which simplifies the structure and control. However, this utility model is not limited to this; the second gear set 530 and the third gear set 540 may also have different first engagement devices 650. The second engagement device 660 is located on the side of the fourth drive gear 551 of the fourth gear set 550 away from the third drive gear 541. Compared with placing the second engagement device 660 between the fourth drive gear 551 and the third drive gear 541, it is obviously more conducive to the dissipation of heat generated by the second engagement device 660 during gear shifting. Furthermore, if the two engagement devices are close together, heat is easy to accumulate, affecting the shifting effect or even damaging the parts.

[0034] Furthermore, the second gear set 530, the third gear set 540, the fourth gear set 550, and the fifth gear set 560 are all staggered. The second gear set 530 includes a second driving gear 531 loosely fitted on the planetary carrier 630, and a second driven gear 532 fixedly connected to the second intermediate shaft 520 and meshing with the second driving gear 531. The third gear set 540 includes a third driving gear 541 loosely fitted on the planetary carrier 630, and a third driven gear 542 fixedly connected to the second intermediate shaft 520 and meshing with the third driving gear 541. The fourth gear set 550 includes a fourth driving gear 551 loosely fitted on the planetary carrier 630, and a fourth driven gear 552 fixedly connected to the second intermediate shaft 520 and meshing with the fourth driving gear 551. A first engagement device 650 is located between the second driving gear 531 and the third driving gear 541 and is used to engage one of the second driving gear 531 and the third driving gear 541 or to disengage from both. A second engagement device 660 is located on the side of the fourth driving gear 551 opposite to the third driving gear 541 and is used to engage or disengage with the fourth driving gear 551.

[0035] In one embodiment of this utility model, a sixth driving gear 210 is provided on the first motor shaft 200. The sixth driving gear 210 is connected to the gear ring 640 of the planetary gear mechanism 600. That is, by adding the sixth driving gear 210, a transmission connection between the first motor shaft 200 and the gear ring 640 is established. Of course, this utility model is not limited to this. It is also possible to directly machine a structure that meshes with the gear ring 640 on the first motor shaft 200. Specifically, the gear ring 640 has an inner meshing part and an outer meshing part on its inner and outer sides, respectively. The inner meshing part meshes with the planet gear 620 provided on the planet carrier 630, and the outer meshing part meshes with the sixth driving gear 210. By machining the inner and outer meshing parts on the inner and outer sides of the gear ring 640, it is convenient to mesh with the sixth driving gear 210 and the planet gear 620 respectively.

[0036] Meanwhile, a third engagement device may also be provided on the first motor shaft 200. The sixth drive gear 210 is loosely fitted on the first motor shaft 200. The third engagement device can engage or disengage the sixth drive gear 210, so that the power of the first motor 201 can also be selectively transmitted to the planetary gear mechanism 600. When the third engagement device is selected to disengage from the sixth drive gear 210, the second motor 301 can be controlled to independently drive the axle drive shaft 100 to realize the single motor independent walking mode.

[0037] In one embodiment of the present invention, the outer meshing portion and the inner meshing portion are staggered on the gear ring 640. The gear ring 640 is provided with the outer meshing portion and the inner meshing portion in sequence along the direction close to the planet carrier 630, so that the sixth driving gear 210 and the planet gear 620 are staggered.

[0038] In one embodiment of this utility model, all engaging devices can be one of a gear sleeve, a synchronizer, and a sliding sleeve.

[0039] In one embodiment of this utility model, the first gear set 310 includes a first driving gear 311 fixedly connected to the second motor shaft 300, and a first driven gear 312 fixedly connected to the intermediate adapter shaft 500 and meshing with the first driving gear 311. That is, the second motor 301 can be configured to always participate in driving the axle drive shaft 100. Of course, this utility model is not limited to this. The first gear set 310 may also be provided with a corresponding engagement device, and the gears in the first gear set 310 provided on the second motor shaft 300 or the intermediate adapter shaft 500 may be empty sleeves, and the engagement device can engage or disengage the empty sleeve gears.

[0040] See Figure 1 In the first embodiment of this utility model, the working transmission shaft 400 is set as a single shaft and is coaxially arranged with the first motor shaft 200, that is, the working transmission shaft 400 is directly connected to the first motor 201 through the first clutch device 410.

[0041] See Figure 2 In the second embodiment of this utility model, the working transmission shaft 400 includes a first transmission shaft 420 and a second transmission shaft 430 arranged in parallel. The first transmission shaft 420 is coaxially arranged with the first motor shaft 200 and connected to the first motor 201 through a first clutch device 410. The second transmission shaft 430 is connected to the working device 401. The first transmission shaft 420 and the second transmission shaft 430 are driven by a torque-increasing gear set 440. By setting the working transmission shaft 400 to include a first transmission shaft 420 and a second transmission shaft 430, and adding a torque-increasing gear set 440 between the first transmission shaft 420 and the second transmission shaft 430, the torque of the second transmission shaft 430 and the working device 401 connected to the second transmission shaft 430 can be increased. Specifically, the working drive shaft 400 also includes several drive shafts arranged parallel to the first drive shaft 420 and the second drive shaft 430, and the several drive shafts are located between the first drive shaft 420 and the second drive shaft 430 in the transmission path. When the number of drive shafts is one, the torque-increasing gear set 440 includes a first torque-increasing gear on the first drive shaft 420, a third torque-increasing gear on the drive shaft and meshing with the first torque-increasing gear, and a second torque-increasing gear on the second drive shaft 430 and meshing with the third torque-increasing gear. Of course, the present invention is not limited to this, and the number of drive shafts can also be two.

[0042] like Figure 1 and Figure 2 As shown, in one embodiment of this utility model, the dual-motor transmission system further includes a brake shaft 700, on which a parking brake 710 and a parking drive gear 720 are provided. The parking drive gear 720 meshes with a driven gear on the axle drive shaft 100, thereby enabling braking of the dual-motor transmission system by controlling the parking brake 710. Specifically, the parking drive gear 720 meshes with a fifth driven gear 562 on the axle drive shaft 100, and the parking drive gear 720 and the fifth drive gear 562 are respectively located on different sides of the axle drive shaft 100.

[0043] In one embodiment of the present invention, the dual-motor drive system further includes a mode selection module, which can issue mode commands corresponding to different needs to control the first motor 201, the second motor 301, each clutch device and each engagement device respectively.

[0044] Understandably, the dual-motor drive system can issue relevant mode commands through a mode selection module. The dual-motor drive system provided by this utility model can be equipped with the following modes: (1) Mode 1: When receiving the instruction of the first gear mode of dual motor coupling travel, the first clutch device 410 is disengaged, the parking brake 710 is disengaged, the first engagement device 650 is switched to engage with the second drive gear 531 of the second gear set 530, the second engagement device 660 is disengaged, and the first motor 201 and the second motor 301 are controlled to drive the corresponding motor shafts to rotate, so that the power can be coupled on the planet carrier 630 of the planetary gear mechanism 600, and the axle drive shaft 100 is driven to rotate through the fifth gear set 560 to improve traction. Power transmission path one is as follows: First motor 201 - First motor shaft 200 - Sixth drive gear 210 - Gear ring 640 - Planetary gear 620 - Planetary carrier 630 - First engagement device 650 - Second gear set 530 - Second intermediate shaft 520 - Fifth gear set 560 - Axle drive shaft 100; Power transmission path two is as follows: Second motor 301 - Second motor shaft 300 - First gear set 310 - First intermediate shaft 510 - Sun gear 610 - Planetary gear 620 - Planetary carrier 630 - First engagement device 650 - Second gear set 530 - Second intermediate shaft 520 - Fifth gear set 560 - Axle drive shaft 100. This mode enables agricultural machinery to perform tasks such as getting out of trouble, heavy-load traction, and plowing operations in complex terrain.

[0045] (2) Mode 2: Upon receiving the operation mode instruction, the first clutch device 410 is engaged, the parking brake 710 is disengaged, the first engagement device 650 is switched to engage with the second drive gear 531 of the second gear set 530 or with the third drive gear 541 of the third gear set 540, the second engagement device 660 is disengaged, and the first motor 201 and the second motor 301 are controlled to drive the corresponding motor shafts to rotate, so that the operation transmission shaft 400 can rotate under the drive of the first motor 201, and the axle drive shaft 100 can rotate under the power coupling drive of the first motor 201 and the second motor 301, thereby realizing power coupling traction travel and improving traction force. Power transmission path one is: first motor 201 - first clutch device 410 - working drive shaft 400 - working device 401; power transmission path two is: first motor 201 - first motor shaft 200 - sixth drive gear 210 - gear ring 640 - planetary gear 620 - planetary carrier 630 - first engagement device 650 - second gear set 530 / third gear set 540 - second intermediate shaft 520 - fifth gear set 560 - axle drive shaft 100; power transmission path three is: second motor 301 - second motor shaft 300 - first gear set 310 - first intermediate shaft 510 - sun gear 610 - planetary gear 620 - planetary carrier 630 - first engagement device 650 - second gear set 530 / third gear set 540 - second intermediate shaft 520 - fifth gear set 560 - axle drive shaft 100. This mode can meet the needs of agricultural machinery for complex operations such as rotary tillage and large-scale sowing.

[0046] (3) Mode 3: When receiving the instruction of the second gear mode of dual motor coupled travel, the first clutch device 410 is disengaged, the parking brake 710 is disengaged, the first engagement device 650 is switched to engage with the third drive gear 541 of the third gear set 540, the second engagement device 660 is disengaged, and the first motor 201 and the second motor 301 are controlled to drive the corresponding motor shafts to rotate, so that the axle drive shaft 100 can rotate under the power coupled drive of the first motor 201 and the second motor 301 to realize power coupled traction travel and improve traction force. The power transmission path is as follows: First motor 201 - First motor shaft 200 - Sixth drive gear 210 - Gear ring 640 - Planetary gear 620 - Planetary carrier 630 - First coupling device 650 - Third gear set 540 - Second intermediate shaft 520 - Fifth gear set 560 - Axle drive shaft 100; The power transmission path is as follows: Second motor 301 - Second motor shaft 300 - First gear set 310 - First intermediate shaft 510 - Sun gear 610 - Planetary gear 620 - Planetary carrier 630 - First coupling device 650 - Third gear set 540 - Second intermediate shaft 520 - Fifth gear set 560 - Axle drive shaft 100. In this mode, agricultural machinery can meet the low-speed travel requirements for ditching, baling, etc.

[0047] (4) Mode 4: When receiving the instruction of the third gear mode of dual motor coupled travel, the first clutch device 410 is disengaged, the parking brake 710 is disengaged, the first engagement device 650 is disengaged from the driving gears of the second gear set 530 and the third gear set 540, the second engagement device 660 is switched to engage with the fourth driving gear 551 of the fourth gear set 550, and the first motor 201 and the second motor 301 are controlled to drive the corresponding motor shafts to rotate, so that the axle drive shaft 100 can rotate under the power coupled drive of the first motor 201 and the second motor 301 to realize power coupled traction travel and improve traction force. The power transmission path is as follows: First motor 201 - First motor shaft 200 - Sixth drive gear 210 - Gear ring 640 - Planetary gear 620 - Planetary carrier 630 - Second coupling device 660 - Fourth gear set 550 - Second intermediate shaft 520 - Fifth gear set 560 - Axle drive shaft 100; The power transmission path is as follows: Second motor 301 - Second motor shaft 300 - First gear set 310 - First intermediate shaft 510 - Sun gear 610 - Planetary gear 620 - Planetary carrier 630 - Second coupling device 660 - Fourth gear set 550 - Second intermediate shaft 520 - Fifth gear set 560 - Axle drive shaft 100. This mode enables high-speed movement and transport of agricultural machinery.

[0048] (5) Mode 5: When a reverse gear command is received, the power transmission path can be the same as one of Mode 1, Mode 3, or Mode 4 (i.e., non-operation mode), only the direction of rotation is reversed, so as to realize the reverse driving of agricultural machinery. Specifically, the reverse operation mode can be: the first motor keeps rotating forward, and the second motor reverses to realize the reverse operation mode.

[0049] Therefore, the dual-motor drive system provided by this utility model has the following advantages: 1. It adopts a single planetary gear mechanism with two motors spaced apart at the front and rear, resulting in a compact, simple, and highly reliable structure.

[0050] 2. The working mode can be switched by shifting gears through the engagement device to meet the operation requirements of different working conditions. It has the advantages of high motor utilization, high transmission efficiency and low energy consumption.

[0051] 3. The first motor can directly drive the PTO shaft, and the output PTO can be continuously variable through mechanical structure.

[0052] 4. When the first motor drives the PTO at a stable speed, the dual motors can couple to control the axle's movement, providing maximum traction while meeting PTO operation requirements. The travel speed and PTO speed are decoupled. In the coupled position, switching between low, medium, and high speeds is also possible.

[0053] Furthermore, this utility model also provides an agricultural machine, which includes the dual-motor transmission system described above. Since the agricultural machine adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. Specifically, the agricultural machine may include, but is not limited to, a tractor.

[0054] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A dual-motor drive system, characterized in that, include: Axle drive shaft (100) is connected to the axle assembly; The first motor shaft (200) is connected to the first motor (201); The second motor shaft (300) is connected to the second motor (301); The working drive shaft (400) is located on the side of the first motor (201) away from the first motor shaft (200) and is connected to the working device (401) and the first motor (201) through the first clutch device (410); An intermediate adapter shaft (500) is provided, on which a planetary gear mechanism (600) is provided. A first gear set (310) meshes and drives between the intermediate adapter shaft (500) and the second motor shaft (300). The sun gear (610) of the planetary gear mechanism (600) is located on the intermediate adapter shaft (500). The ring gear (640) of the planetary gear mechanism (600) is connected to the first motor shaft (200) for transmission. The planet carrier (630) of the planetary gear mechanism (600) is coaxially arranged with the intermediate adapter shaft (500). A first gear shifting device is provided between the planet carrier (630) and the axle drive shaft (100).

2. The dual-motor drive system according to claim 1, characterized in that, The first gear shifting device is configured to switch between two gears. The first gear shifting device includes a second gear set (530), a third gear set (540), and a first engagement device (650). The second gear set (530) and the third gear set (540) are respectively staggered between the planetary carrier (630) and the axle drive shaft (100) and are both configured to mesh. The first engagement device (650) is disposed on the planetary carrier (630) and is used to select one of the second gear set (530) and the third gear set (540) to engage or to disengage from both.

3. The dual-motor drive system according to claim 2, characterized in that, The intermediate adapter shaft (500) includes a first intermediate shaft (510) and a second intermediate shaft (520) arranged in parallel. The first intermediate shaft (510) is provided with the planetary gear mechanism (600) between itself and the first motor shaft (200), and with the second motor shaft (300) between itself and the first gear set (310). The sun gear (610) of the planetary gear mechanism (600) is located on the first intermediate shaft (510). The planet carrier (630) of the planetary gear mechanism (600) is coaxially arranged with the first intermediate shaft (510). The second gear set (530) and the third gear set (540) are provided between the planet carrier (630) and the second intermediate shaft (520). The second intermediate shaft (520) is provided with a fifth gear set (560) for meshing transmission between itself and the axle drive shaft (100).

4. The dual-motor drive system according to claim 3, characterized in that, The first gear set (310) and the planetary gear mechanism (600) are respectively located at opposite ends of the first intermediate shaft (510), and the second motor shaft (300) is located on the side of the first motor shaft (200) away from the first motor (201).

5. The dual-motor drive system according to claim 3, characterized in that, The planetary carrier (630) includes a disk portion (631) and a rod portion (632) arranged sequentially along the axial direction of the first intermediate shaft (510). The planetary gears (620) of the planetary gear mechanism (600) are disposed on the disk portion (631). The second gear set (530) and the third gear set (540) are provided between the rod portion (632) and the second intermediate shaft (520).

6. The dual-motor drive system according to claim 3, characterized in that, A second gear shifting device is also provided between the planetary carrier (630) and the second intermediate shaft (520). The second gear shifting device includes a fourth gear set (550) and a second engagement device (660). The fourth gear set (550) is meshed and driven between the planetary carrier (630) and the second intermediate shaft (520). The second engagement device (660) is provided on the planetary carrier (630) and is used to engage or disengage the fourth gear set (550).

7. The dual-motor drive system according to claim 6, characterized in that, The driving gears of the second gear set (530), the third gear set (540), and the fourth gear set (550) are sequentially loosely mounted on the planet carrier (630), and the first engagement device (650) is located between the second driving gear (531) of the second gear set (530) and the third driving gear (541) of the third gear set (540), and the second engagement device (660) is located on the side of the fourth driving gear (551) of the fourth gear set (550) away from the third driving gear (541).

8. The dual-motor drive system according to any one of claims 1 to 7, characterized in that, The first motor shaft (200) is provided with a sixth driving gear (210), which is connected to the gear ring (640) of the planetary gear mechanism (600). The gear ring (640) has an inner meshing part and an outer meshing part on its inner and outer sides respectively. The inner meshing part meshes with the planet gear (620) provided on the planet carrier (630), and the outer meshing part meshes with the sixth driving gear (210). And / or, all engagement devices are configured as one of the following: gear sleeve, synchronizer, and sliding sleeve.

9. The dual-motor drive system according to any one of claims 1 to 7, characterized in that, The first gear set (310) includes a first driving gear (311) fixed to the second motor shaft (300) and a first driven gear (312) fixed to the intermediate adapter shaft (500) and meshing with the first driving gear (311); And / or, the dual-motor drive system further includes a brake shaft (700), on which a parking brake (710) and a parking drive gear (720) are provided, and the parking drive gear (720) meshes with a driven gear on the axle drive shaft (100) for transmission.

10. An agricultural machine, characterized in that, The agricultural machinery includes a dual-motor drive system according to any one of claims 1 to 9.

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