Dual motor drive system and agricultural machine

Abstract

This utility model discloses a dual-motor transmission system and agricultural machinery, including a first output shaft, a first input shaft, a second input shaft, and an intermediate shaft. The intermediate shaft includes a first shaft segment and a second shaft segment that are coaxially disconnected. A planetary gear mechanism is provided between the first shaft segment and the second shaft segment. The sun gear and planet carrier of the planetary gear mechanism are respectively disposed on the first shaft segment and the second shaft segment. One of the first input shaft and the second input shaft is provided with a first gear set that meshes with the first shaft segment, and the other is connected to the gear ring of the planetary gear mechanism. A first gear switching device is provided between the second shaft segment and the first output shaft, thereby enabling the simultaneous satisfaction of stable operating output speed and high traction travel conditions.

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 a first output shaft, a first input shaft, a second input shaft, and an intermediate shaft; the first input shaft is connected to a first motor; the second input shaft is connected to a second motor; the intermediate shaft includes a first shaft segment and a second shaft segment coaxially disconnected, a planetary gear mechanism is provided between the first shaft segment and the second shaft segment, the sun gear and planet carrier of the planetary gear mechanism are respectively disposed on the first shaft segment and the second shaft segment, one of the first input shaft and the second input shaft is provided with a first gear set meshing with the first shaft segment, and the other is connected to the gear ring of the planetary gear mechanism; a first gear shifting device is provided between the second shaft segment and the first output 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 staggered between the second shaft segment and the first output shaft and are both configured to mesh and drive. The first engagement device is used to select one of the second gear set and the third gear set to engage for gear switching.

[0007] In one embodiment of the present invention, the dual-motor transmission system further includes two intermediate shafts, a fifth gear set for meshing transmission is provided between the two intermediate shafts and the second shaft segment, a second gear set and a third gear set are provided between the two intermediate shafts and the first output shaft, and a first engagement device is provided between the second gear set and the third gear set, and is used to select one of the second gear set and the third gear set for engagement or to disconnect both from both.

[0008] In one embodiment of the present invention, a second gear switching device capable of switching to a first gear is provided between the intermediate two shafts and the first output shaft. The second gear switching device includes a fourth gear set and a second engagement device. The fourth gear set is located between the intermediate two shafts and the first output shaft, and the second engagement device is located on one of the intermediate two shafts and the first output shaft, and is used to engage or disengage the fourth gear set.

[0009] In one embodiment of this utility model, the first engagement device and the second engagement device are respectively disposed on opposite sides of the fifth gear set.

[0010] In one embodiment of this utility model, the second driving gear of the second gear set and the third driving gear of the third gear set are both loosely fitted on the intermediate two shafts. The first engagement device is provided on the intermediate two shafts so that one of the second driving gear and the third driving gear can be engaged or both can be disconnected.

[0011] In one embodiment of this utility model, the fourth driving gear of the fourth gear set is loosely fitted on the intermediate two shafts, and the second engagement device is provided on the intermediate two shafts to engage or disengage with the fourth driving gear.

[0012] In one embodiment of the present invention, one of the first input shaft and the second input shaft is located in front of the other, and the first motor is located at the end of the first input shaft away from the second input shaft, and the second motor is located at the end of the second input shaft away from the first input shaft.

[0013] In one embodiment of the present invention, a first gear set is provided between the first input shaft and the first shaft segment, and a sixth driving gear is provided on the second input shaft to mesh with the ring gear of the planetary gear mechanism.

[0014] In one embodiment of this utility model, the inner and outer sides of the gear ring are provided with an inner meshing part and an outer meshing part, respectively. The inner meshing part meshes with the planetary gears provided on the planet carrier for transmission, and the outer meshing part meshes with the corresponding motor shaft for transmission.

[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, and the parking drive gear meshes with the driven gear on the first output shaft for transmission.

[0016] In one embodiment of this utility model, all the engagement devices are configured as one of a toothed sleeve, a synchronizer, and a sliding sleeve.

[0017] In one embodiment of the present invention, the first output shaft is connected to the axle device, and the dual-motor transmission system further includes a second output shaft, which is provided with a first clutch device and connected to the output device and the first motor.

[0018] 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.

[0019] 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 a first output shaft, a first input shaft, a second input shaft, and an intermediate shaft. The intermediate shaft comprises a first shaft segment and a second shaft segment that are coaxially disconnected. A planetary gear mechanism is provided between the first and second shaft segments. The sun gear and planet carrier of the planetary gear mechanism are respectively located on the first and second shaft segments. One of the first and second input shafts is connected to the first shaft segment by a first gear set that meshes with it, and the other is connected to the gear ring of the planetary gear mechanism. A first gear shifting device is provided between the second shaft segment and the first output shaft. By adding an intermediate shaft and connecting the first gear set and the planetary gear mechanism to the two motor shafts on the intermediate shaft, this invention enables the power of the first and second motors to achieve power coupling and speed decoupling on the planet carrier of the planetary gear mechanism. This allows for the simultaneous satisfaction of stable operating output speed and high traction travel conditions. Furthermore, the first gear shifting device between the second shaft segment connected to the planet carrier and the first output shaft allows the dual motors to switch between different gears in the coupled drive mode by controlling the first gear shifting device. In addition, it can obviously simplify the structure, reduce the difficulty of production, and improve reliability.

[0020] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0021] 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 a dual-motor drive system according to an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of a dual-motor drive system according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: 100. First output shaft; 101. Front axle assembly; 102. Rear axle assembly; 200. First input shaft; 201. First motor; 210. First gear set; 211. First driving gear; 212. First driven gear; 300. Second input shaft; 301. Second motor; 310. Sixth driving gear; 400. Second output shaft; 401. Output device; 410. First clutch device; 500. Intermediate shaft; 510. First shaft section; 520. Second shaft section; 530. Fifth gear set; 531. Fifth driving gear; 532. Fifth driven gear; 600. Planetary gear mechanism 610, Sun gear; 620, Planet gear; 630, Planet carrier; 640, Ring gear; 641, Inner meshing part; 642, Outer meshing part; 700, Intermediate second shaft; 710, Second gear set; 711, Second driving gear; 712, Second driven gear; 720, Third gear set; 721, Third driving gear; 722, Third driven gear; 730, Fourth gear set; 731, Fourth driving gear; 732, Fourth driven gear; 740, First engagement device; 750, Second engagement device; 800, Brake shaft; 810, Parking brake; 820, Parking driving gear. Detailed Implementation

[0023] 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.

[0024] The dual-motor drive system and agricultural machinery of this utility model are described below with reference to the accompanying drawings.

[0025] like Figures 1 to 2 As shown, this utility model provides a dual-motor drive system, wherein the dual-motor drive system includes: First output shaft 100; The first input shaft 200 is connected to the first motor 201; The second input shaft 300 is connected to the second motor 301; The intermediate shaft 500 includes a first shaft segment 510 and a second shaft segment 520 that are coaxially disconnected. A planetary gear mechanism 600 is provided between the first shaft segment 510 and the second shaft segment 520. The sun gear 610 and the planet carrier 630 of the planetary gear mechanism 600 are respectively disposed on the first shaft segment 510 and the second shaft segment 520. One of the first input shaft 200 and the second input shaft 300 is provided with a first gear set 210 that meshes with the first shaft segment 510, and the other is connected to the gear ring 640 of the planetary gear mechanism 600. A first gear shifting device is provided between the second shaft segment 520 and the first output shaft 100.

[0026] When using the aforementioned dual-motor drive system, it includes a first output shaft 100, a first input shaft 200, a second input shaft 300, and an intermediate shaft 500. The intermediate shaft 500 includes a first shaft segment 510 and a second shaft segment 520 coaxially disconnected. A planetary gear mechanism 600 is provided between the first shaft segment 510 and the second shaft segment 520. The sun gear 610 and planet carrier 630 of the planetary gear mechanism 600 are respectively disposed on the first shaft segment 510 and the second shaft segment 520. One of the first input shafts 200 and 300 is connected to the first shaft segment 510 by a first gear set 210 for meshing transmission, and the other is connected to the gear ring 640 of the planetary gear mechanism 600 for transmission. The second shaft segment 520 and... A first gear shifting device is provided between the first output shaft 100 and the first output shaft 100. This invention, through the addition of an intermediate shaft 500 and the transmission connection of the first gear set 210 and the planetary gear mechanism 600 to the two motor shafts respectively on the intermediate shaft 500, enables power coupling and speed decoupling of the power of the first motor 201 and the second motor 301 on the planetary carrier 630 of the planetary gear mechanism 600. This allows for simultaneous stable operating output speed and high traction travel. Furthermore, the first gear shifting device is provided between the second shaft segment 520 connected to the planetary carrier 630 and the first output shaft 100, allowing the dual motors to switch between different gears in coupled drive mode. In addition, this invention significantly simplifies the structure, reduces production difficulty, and improves reliability.

[0027] 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 710, a third gear set 720, and a first engagement device 740. The second gear set 710 and the third gear set 720 are staggered between the second shaft segment 520 and the first output shaft 100 and are both configured for meshing transmission. The first engagement device 740 is used to select one of the second gear set 710 and the third gear set 720 for engagement to perform gear switching. That is, two gears can be switched through the first engagement device 740. Furthermore, the speed ratio of the third gear set 720 can be set to be less than the speed ratio of the second gear set 710.

[0028] Specifically, the aforementioned dual-motor drive system can have two gear positions for dual-motor power coupling drive. In one of the dual-motor coupling drive gear positions, the first engagement device 740 engages with the second gear set 710, 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 first output shaft 100 through the second gear set 710. In the other dual-motor coupling drive gear position, the first engagement device 740 engages with the third gear set 720, 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 first output shaft 100 through the third gear set 720. It should be noted that the first output shaft 100, the first input shaft 200, the second input shaft 300, and the intermediate shaft 500 can all be arranged to extend along the longitudinal direction of the vehicle frame, and the relative positional relationship between each shaft is set to satisfy power transmission requirements. The first output 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. Of course, this utility model is not limited to this. The first output shaft 100 can also be connected to other suitable devices. In addition, the first output shaft 100, the first input shaft 200, the second input shaft 300, and the intermediate shaft 500 can all be rotatably mounted on the frame. The first engagement device 740 includes, but is not limited to, one of a gear sleeve, a synchronizer, a sliding sleeve, or a sliding gear.

[0029] In one embodiment of this utility model, the dual-motor transmission system further includes an intermediate second shaft 700. A fifth gear set 530 for meshing transmission is provided between the intermediate second shaft 700 and the second shaft segment 520. A second gear set 710 and a third gear set 720 are provided between the intermediate second shaft 700 and the first output shaft 100. A first engagement device 740 is provided between the second gear set 710 and the third gear set 720 and is used to select one of the second gear set 710 and the third gear set 720 for engagement or to disconnect both from both. By adding an intermediate second shaft 700 between the intermediate first shaft 500 and the first output shaft 100, the second gear set 710 and the third gear set 720 for shifting do not need to be located on the second shaft segment 520. On the one hand, this meets the requirement that the location of the second shaft segment 520 needs to be cleared or accommodate the installation of other components. On the other hand, the length of the intermediate second shaft 700 can be significantly longer than that of the second shaft segment 520 to accommodate more shifting gear sets. Furthermore, only one first engagement device 740 is provided between the second gear set 710 and the third gear set 720, thereby enabling gear shifting while reducing the number of engagement devices. Of course, this invention is not limited to this; it is also possible for the second gear set 710 and the third gear set to each have different first engagement devices 740.

[0030] Specifically, the intermediate second shaft 700 is also configured to extend along the longitudinal direction of the frame and is rotatably mounted on the frame. The fifth gear set 530 includes a fifth driving gear 531 mounted on the second shaft section 520 and a fifth driven gear 532 mounted on the intermediate second shaft 700 and meshing with the fifth driving gear 531. The fifth driving gear 531 is positioned on the second shaft section 520 near the planetary carrier 630. In addition, the second engagement device 750 includes, but is not limited to, a gear sleeve, a synchronizer, a sliding sleeve, or a sliding gear.

[0031] In one embodiment of this utility model, a second gear switching device capable of switching to a first gear is further provided between the intermediate second shaft 700 and the first output shaft 100. Simultaneously, the first gear switching device can select between a second gear and a third gear, thus providing three gear positions. The second gear switching device includes a fourth gear set 730 and a second engagement device 750. The fourth gear set 730 is located between the intermediate second shaft 700 and the first output shaft 100, and the second engagement device 750 is located on one of the intermediate second shaft 700 and the first output shaft 100, and is used to engage or disengage the fourth gear set 730. Specifically, the speed ratio of the fourth gear set 730 is different from that of the second gear set 710 and the third gear set 720. By adding the fourth gear set 730 and the second engagement device 750, the number of gears in the dual-motor power coupling drive can be further expanded to adapt to different operating conditions. Furthermore, the speed ratio of the fourth gear set 730 is set to be greater than that of the second gear set 710, that is, the fourth gear set 730 corresponds to the low-speed gear set, the second gear set 710 corresponds to the medium-speed gear set, and the third gear set 720 corresponds to the high-speed gear set.

[0032] In one embodiment of this utility model, the gears are respectively disposed on opposite sides of the fifth gear set 530. Furthermore, the first engaging device 740 and the second engaging device 750 are respectively disposed one-to-one with the two shaft segments of the intermediate shaft 500. The intermediate second shaft 700 can then be arranged parallel to the intermediate first shaft 500, and by distributing the first engaging device 740 and the second engaging device 750 on opposite sides of the fifth gear set 530, the gear shifting gears are more dispersed on the intermediate second shaft 700, facilitating disassembly and maintenance. Specifically, the fourth gear set 730, the second gear set 710, and the third gear set 720 are arranged sequentially at intervals. The fourth gear set 730 and the second engaging device 750 are disposed corresponding to the first shaft segment 510, and the second gear set 710, the third gear set 720, and the first engaging device 740 are disposed corresponding to the second shaft segment 520.

[0033] In one embodiment of this utility model, the second driving gear 711 of the second gear set 710 and the third driving gear 721 of the third gear set 720 are both loosely fitted on the intermediate second shaft 700. A first engaging device 740 is provided on the intermediate second shaft 700 to engage one of the second driving gear 711 and the third driving gear 721 or to disconnect both. Placing the first engaging device 740 on the intermediate second shaft 700 can reduce the load on the first output shaft 100. It can be understood that the second gear set 710 includes a second driving gear 711 loosely fitted on the intermediate second shaft 700 and a second driven gear 712 fixedly connected to the first output shaft 100 and meshing with the second driving gear 711. The third gear set 720 includes a third driving gear 721 loosely fitted on the intermediate second shaft 700 and a third driven gear 722 fixedly connected to the first output shaft 100 and meshing with the third driving gear 721.

[0034] In one embodiment of this utility model, the fourth driving gear 731 of the fourth gear set 730 is loosely fitted on the intermediate second shaft 700, and the second engaging device 750 is provided on the intermediate second shaft 700 to engage or disengage with the fourth driving gear 731. Placing the second engaging device 750 on the intermediate second shaft 700 can reduce the load on the first output shaft 100. It can be understood that the fourth gear set 730 includes the fourth driving gear 731 loosely fitted on the intermediate second shaft 700, and the fourth driven gear 732 fixed to the first output shaft 100 and meshing with the fourth driving gear 731.

[0035] In one embodiment of this utility model, one of the first input shaft 200 and the second input shaft 300 is located in front of the other, and the first motor 201 is located at the end of the first input shaft 200 away from the second input shaft 300, and the second motor 301 is located at the end of the second input shaft 300 away from the first input shaft 200. That is, the first motor 201 and the second motor 301 are respectively located at the ends of the corresponding input shafts that are opposite to each other, so that the two motors can be staggered from the shaft system of the transmission system, ensuring sufficient installation space. It should be noted that one input shaft being located in front of the other input shaft is not limited to being directly in front; it is also possible for one input shaft to have a shaft segment located in front of the other input shaft on one side. Preferably, the second input shaft 300 is located in front of the first input shaft 200.

[0036] In one embodiment of this utility model, a first gear set 210 is provided between the first input shaft 200 and the first shaft segment 510. The first gear set 210 includes a first driving gear 211 provided on the first input shaft 200 and a first driven gear 212 provided on the first shaft segment 510 and meshing with the first driving gear 211. That is, the power of the first motor 201 is transmitted sequentially through the first input shaft 200, the first gear set 210, the first shaft segment 510 and the sun gear 610 to the planet gear 620 on the planet carrier 630. A sixth driving gear 310 is provided on the second input shaft 300 and meshes with the gear ring 640 of the planetary gear mechanism 600. That is, the power of the second motor 301 is transmitted sequentially through the second input shaft 300 and the gear ring 640 to the planet gear 620 on the planet carrier 630. By adding the sixth driving gear 310, a transmission connection between the second input shaft 300 and the gear ring 640 is established, which simplifies the manufacturing process. Of course, this utility model is not limited to this. It can also be that the structure that meshes with the gear ring 640 can be directly machined on the second input shaft 300.

[0037] In one embodiment of this utility model, the inner and outer sides of the gear ring 640 are respectively provided with an inner meshing portion 641 and an outer meshing portion 642. The inner meshing portion 641 meshes with the planet gear 620 provided on the planet carrier 630, and the outer meshing portion 642 meshes with the corresponding motor shaft. By directly machining the inner meshing portion 641 and the outer meshing portion 642 on the inner and outer sides of the gear ring 640, it is convenient to mesh with the sixth driving gear 310 and the planet gear 620 respectively. Specifically, the inner meshing portion 641 and the outer meshing portion 642 on the gear ring 640 are staggered so that the sixth driving gear 310 and the planet gear 620 are staggered. The planet carrier 630 is located on the side of the sun gear 610 away from the first shaft segment 510, and the outer meshing portion 642 and the planet carrier 630 are located on the same side of the sun gear 610, so as to shorten the second input shaft 300.

[0038] In one embodiment of this utility model, the dual-motor transmission system further includes a brake shaft 800, on which a parking brake 810 and a parking drive gear 820 are mounted. The parking drive gear 820 meshes with a driven gear on the first output shaft 100. Thus, braking of the dual-motor transmission system can be achieved by controlling the parking brake 810. Specifically, the parking drive gear 820 is configured to mesh with a fourth driven gear 732 on the first output shaft 100. Since the fourth driven gear 732 is the largest driven gear on the first output shaft 100, the meshing of the parking drive gear 820 with the fourth driven gear 732 can increase torque.

[0039] In one embodiment of this utility model, all the engagement devices are configured as one of a toothed sleeve, a synchronizer, and a sliding sleeve.

[0040] In one embodiment of this utility model, the first output shaft 100 is connected to the axle assembly, specifically to at least one of the front axle assembly 101 and the rear axle assembly 102. The dual-motor drive system also includes a second output shaft 400, which is equipped with a first clutch device 410 and connects to the output device 401 and the first motor 201. That is, when the dual-motor drive system is installed on a vehicle, the first output shaft 100 is connected to the axle assembly, and a second output shaft 400 can be added to connect to other output devices 401, which is convenient for adapting to the needs of engineering machinery, agricultural machinery, etc., that require simultaneous movement and operation, thereby further expanding the application scenarios. The addition of the first clutch device 410 allows the power of the first motor 201 to be selectively transmitted to the output device 401.

[0041] Specifically, the second output shaft 400 is a PTO (Power Take-Off) shaft, and the output device 401 connected to the second output shaft 400 includes, but is not limited to, one of a rotary tillage output device 401, a seeding output device 401, a ditching output device 401, and a baling output device 401. The first clutch device 410 includes, but is not limited to, a clutch.

[0042] Furthermore, a third engagement device may be provided on the first input shaft 200 and / or the second input shaft 300. The first drive gear 211 on the first input shaft 200 may be loosely fitted. The third engagement device on the first input shaft 200 may engage or disengage the first drive gear 211, so that the power of the first motor 201 may be selectively transmitted to the planetary gear mechanism 600. The sixth drive gear 310 on the second input shaft 300 may be loosely fitted. The third engagement device on the second input shaft 300 may engage or disengage the sixth drive gear 310, so that the power of the second motor 301 may be selectively transmitted to the planetary gear mechanism 600. This also enables single-motor output control of the first output shaft 100.

[0043] It should be noted that the preferred solution also needs to consider other feasible alternatives: 1. The gear sets that can be selectively engaged by the first engagement device and the second engagement device can also be interchanged.

[0044] 2. Adding idler gears between gear sets is also an option.

[0045] 3. It is also possible to interchange the mounting positions of the front axle and the rear axle on the first output shaft, or the first output shaft can be connected to only one of the front axle and the rear axle, which should be considered an alternative.

[0046] 4. The PTO shaft is directly driven by the motor and continuously variable transmission. Adding multiple gear sets to the PTO to make it multi-gear should be considered as an alternative solution.

[0047] 5. The first and second motors can be at the same speed or different speeds. Changing the motor structure and type should be considered as an alternative solution.

[0048] 6. Adding or changing the number and type of brakes in any location should be considered an alternative.

[0049] In one embodiment of this utility model, the dual-motor drive system further includes a controller, which is signal-connected to the first motor 201, the second motor 301, the first clutch device 410, and the first engagement device 740, and is configured to include: Upon receiving the command for the second gear of the dual-motor coupled travel, the system controls the start of the first motor 201 and the second motor 301, disengages the first clutch device 410, and controls the first engagement device 740 to engage the second gear set 710. Upon receiving the command for the third gear of the dual-motor coupled travel, the system controls the start of the first motor 201 and the second motor 301, disengages the first clutch device 410, and controls the first engagement device 740 to engage the third gear set 720. Upon receiving a work mode command, the system controls the start of the first motor 201 and the second motor 301, engages the first clutch device 410, and controls the first engagement device 740 to engage with the second gear set 710 or the third gear set 720.

[0050] Understandably, a mode selection module may also be provided. This module 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, thereby facilitating control. When a fourth gear set 730 and a second engagement device 750 are added, the controller is further configured to include: Upon receiving the command for the first gear of the dual-motor coupled travel, the system controls the start of the first motor 201 and the second motor 301, disconnects the first clutch device 410, and controls the first engagement device 740 to disconnect from the second gear set 710 and the third gear set 720, and the second engagement device 750 to engage with the fourth gear set 730.

[0051] Furthermore, upon receiving commands for the second and third gears of the dual-motor coupled travel, the second engagement device 750 is controlled to disconnect.

[0052] The dual-motor drive system provided by this utility model can be configured in 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 810 is disengaged, the first engagement device 740 is disengaged from the second drive gear 711 and the third drive gear 721, the second engagement device 750 is engaged with the fourth drive gear 731, and the first motor 201 and the second motor 301 are controlled to drive the corresponding input shafts to rotate, so that the power can be coupled on the planet carrier 630 of the planetary gear mechanism 600, and the first output shaft 100 is driven to rotate through the fourth gear set 730 to improve the traction force. Power transmission path one is as follows: First motor 201 - First input shaft 200 - First gear set 210 - First shaft section 510 - Sun gear 610 - Planetary gear 620 - Planetary carrier 630 - Second shaft section 520 - Fifth gear set 530 - Intermediate second shaft 700 - Second coupling device 750 - Fourth gear set 730 - First output shaft 100 - Axle assembly; Power transmission path two is as follows: Second motor 301 - Second input shaft 300 - Sixth driving gear 310 - Gear ring 640 - Planetary gear 620 - Planetary carrier 630 - Second shaft section 520 - Fifth gear set 530 - Intermediate second shaft 700 - Second coupling device 750 - Fourth gear set 730 - First output shaft 100 - Axle assembly. This mode enables agricultural machinery to perform low-speed movement for tasks such as getting out of trouble, heavy-load traction, and plowing operations in complex terrain.

[0053] (2) Mode 2: When receiving the instruction of the second gear mode of dual motor coupled walking, the first clutch device 410 is disengaged, the parking brake 810 is disengaged, the first engagement device 740 is switched to engage with the second drive gear 711 of the second gear set 710, the second engagement device 750 is disengaged, and the first motor 201 and the second motor 301 are controlled to drive the corresponding input shafts to rotate, so that the first output shaft 100 can rotate under the power coupled drive of the first motor 201 and the second motor 301 to realize power coupled traction walking, so as to improve traction force. Power transmission path one is as follows: First motor 201 - First input shaft 200 - First gear set 210 - First shaft section 510 - Sun gear 610 - Planetary gear 620 - Planetary carrier 630 - Second shaft section 520 - Fifth gear set 530 - Intermediate second shaft 700 - First coupling device 740 - Second gear set 710 - First output shaft 100 - Axle assembly; Power transmission path two is as follows: Second motor 301 - Second input shaft 300 - Sixth driving gear 310 - Gear ring 640 - Planetary gear 620 - Planetary carrier 630 - Second shaft section 520 - Fifth gear set 530 - Intermediate second shaft 700 - First coupling device 740 - Second gear set 710 - First output shaft 100 - Axle assembly. In this mode, agricultural machinery can meet the needs of medium-speed travel, rotary tillage, sowing, ditching, and baling operations.

[0054] (3) Mode 3: When receiving the instruction of the third gear mode of dual motor coupled travel, the first clutch device 410 is disengaged, the parking brake 810 is disengaged, the first engagement device 740 is engaged with the third drive gear 721 of the third gear set 720, the second engagement device 750 is disengaged, and the first motor 201 and the second motor 301 are controlled to drive the corresponding input shafts to rotate, so that the first output 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. Power transmission path one is as follows: First motor 201 - First input shaft 200 - First gear set 210 - First shaft section 510 - Sun gear 610 - Planetary gear 620 - Planetary carrier 630 - Second shaft section 520 - Fifth gear set 530 - Intermediate second shaft 700 - First coupling device 740 - Third gear set 720 - First output shaft 100 - Axle assembly; Power transmission path two is as follows: Second motor 301 - Second input shaft 300 - Sixth driving gear 310 - Gear ring 640 - Planetary gear 620 - Planetary carrier 630 - Second shaft section 520 - Fifth gear set 530 - Intermediate second shaft 700 - First coupling device 740 - Third gear set 720 - First output shaft 100 - Axle assembly. This mode enables high-speed movement and transport of agricultural machinery.

[0055] (4) Mode 4: Upon receiving the operation mode command, the first clutch device 410 is engaged, the parking brake 810 is disengaged, the second engagement device 750 is engaged with the fourth drive gear 731 (operation gear 1) / the first engagement device 740 is switched to engage with the second drive gear 711 (operation gear 2), and the first motor 201 and the second motor 301 are controlled to drive the corresponding input shafts to rotate, so that the second output shaft 400 can rotate under the drive of the first motor 201, and the first output shaft 100 can rotate under the power coupling drive of the first motor 201 and the second motor 301, realizing power coupling traction travel to improve traction. In this mode, gear 1 can be used for land reclamation, and gear 2 can meet the needs of complex operations such as rotary tillage and large-scale sowing.

[0056] (5) Mode 5: When agricultural machinery needs to be stopped for a long time, the parking brake 810 is engaged to fix the brake shaft 800 and the parking drive gear 820 so that they cannot rotate, thereby preventing the first output shaft 100 from rotating and the vehicle can achieve parking braking.

[0057] (6) Mode Six: When a reverse gear command is received, the power transmission path can be the same as one of Modes One to Three (i.e., non-operation modes), only the direction of rotation is reversed, thus realizing 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.

[0058] 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.

[0059] 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.

[0060] 3. The first motor can directly drive the PTO shaft, and the output PTO can be continuously variable through mechanical structure.

[0061] 4. When the first motor operates at a stable speed and directly drives the PTO, the two motors can be coupled to control the movement of the axle device, thus providing a large traction force while meeting the requirements of PTO operation. In the coupled position, it is also possible to switch between low-speed, medium-speed, and high-speed gears.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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 by, include: First output shaft (100); The first input shaft (200) is connected to the first motor (201); The second input shaft (300) is connected to the second motor (301); An intermediate shaft (500) includes a first shaft segment (510) and a second shaft segment (520) that are coaxially disconnected. A planetary gear mechanism (600) is provided between the first shaft segment (510) and the second shaft segment (520). The sun gear (610) and the planet carrier (630) of the planetary gear mechanism (600) are respectively disposed on the first shaft segment (510) and the second shaft segment (520). One of the first input shaft (200) and the second input shaft (300) is provided with a first gear set (210) that meshes with the first shaft segment (510), and the other is connected to the gear ring (640) of the planetary gear mechanism (600). A first gear shifting device is provided between the second shaft segment (520) and the first output 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 (710), a third gear set (720), and a first engagement device (740). The second gear set (710) and the third gear set (720) are offset between the second shaft segment (520) and the first output shaft (100) and are both configured to mesh. The first engagement device (740) is used to select one of the second gear set (710) and the third gear set (720) to engage for gear shifting.

3. The dual-motor drive system according to claim 2, characterized in that, The dual-motor transmission system further includes an intermediate second shaft (700), a fifth gear set (530) for meshing transmission is provided between the intermediate second shaft (700) and the second shaft segment (520), a second gear set (710) and a third gear set (720) are provided between the intermediate second shaft (700) and the first output shaft (100), and a first engagement device (740) is provided between the second gear set (710) and the third gear set (720), and is used to select one of the second gear set (710) and the third gear set (720) to engage or to disconnect both from both.

4. The dual-motor drive system according to claim 3, characterized in that, A second gear switching device capable of switching to a first gear is also provided between the intermediate second shaft (700) and the first output shaft (100). The second gear switching device includes a fourth gear set (730) and a second engagement device (750). The fourth gear set (730) is located between the intermediate second shaft (700) and the first output shaft (100). The second engagement device (750) is located on one of the intermediate second shaft (700) and the first output shaft (100) and is used to engage or disengage the fourth gear set (730).

5. The dual-motor drive system according to claim 4, characterized in that, The first engagement device (740) and the second engagement device (750) are respectively located on opposite sides of the fifth gear set (530).

6. The dual-motor drive system according to claim 4, characterized in that, The second drive gear (711) of the second gear set (710) and the third drive gear (721) of the third gear set (720) are both loosely fitted on the intermediate two shafts (700). The first engagement device (740) is provided on the intermediate two shafts (700) to select one of the second drive gear (711) and the third drive gear (721) to engage or to disconnect both of them. And / or, the fourth drive gear (731) of the fourth gear set (730) is loosely fitted on the intermediate two shafts (700), and the second engagement device (750) is provided on the intermediate two shafts (700) to engage or disengage with the fourth drive gear (731).

7. The dual-motor drive system according to claim 1, characterized in that, One of the first input shaft (200) and the second input shaft (300) is located in front of the other, and the first motor (201) is located at the end of the first input shaft (200) away from the second input shaft (300), and the second motor (301) is located at the end of the second input shaft (300) away from the first input shaft (200); And / or, the first gear set (210) is provided between the first input shaft (200) and the first shaft segment (510), and the second input shaft (300) is provided with a sixth driving gear (310) that meshes with the gear ring (640) of the planetary gear mechanism (600); And / or, the gear ring (640) has an inner meshing part (641) and an outer meshing part (642) on its inner and outer sides respectively. The inner meshing part (641) meshes with the planet gear (620) provided on the planet carrier (630) for transmission, and the outer meshing part (642) meshes with the corresponding motor shaft for transmission. And / or, the dual-motor drive system further includes a brake shaft (800), on which a parking brake (810) and a parking drive gear (820) are provided, and the parking drive gear (820) meshes with the driven gear on the first output shaft (100) for transmission.

8. The dual-motor drive system according to any one of claims 1 to 7, characterized in that, 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 output shaft (100) is connected to the axle device. The dual-motor transmission system also includes a second output shaft (400). The second output shaft (400) is provided with a first clutch device (410) and is connected to the output device (401) and the first motor (201).

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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