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, operation transmission shaft is connected with operation device and is connected with first motor shaft through first clutch device, be equipped with planetary gear mechanism on intermediate adapter axle, be equipped with the first gear group of meshing transmission between intermediate adapter axle and second motor shaft, the sun gear of planetary gear mechanism is located on intermediate adapter axle, the gear ring of planetary gear mechanism is transmission connection with first motor shaft, the planet carrier of planetary gear mechanism is empty sleeve on intermediate adapter axle, and the planet carrier is staggered with axle drive shaft and is equipped with the second gear group and third gear group of meshing transmission and different speed ratio, is equipped with first engagement device on planet carrier to with one of second gear group and third gear group or all with two disconnects, thereby can satisfy the working condition of stable operation output rotation speed and big traction 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 connected to a working device and connected to the first motor shaft through a first clutch device; a planetary gear mechanism is provided on the intermediate transfer shaft, and a first gear set with meshing transmission is provided 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 of the planetary gear mechanism is connected to the first motor shaft, the planet carrier of the planetary gear mechanism is loosely fitted on the intermediate transfer shaft, and a second gear set and a third gear set with different speed ratios and meshing transmission are provided between the planet carrier and the axle drive shaft, and a first engagement device is provided on the planet carrier to engage with one of the second gear set and the third gear set or to disengage from both.

[0006] In one embodiment of this utility model, a fourth gear set for meshing transmission is provided between the planetary carrier and the axle drive shaft. The speed ratio of the fourth gear set is less than that of the third gear set. A second engagement device is provided on the planetary carrier to engage or disengage with the fourth gear set.

[0007] 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.

[0008] 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, and the planet carrier of the planetary gear mechanism is mounted on the first intermediate shaft. A second gear set and a third gear set are provided between the planet carrier and the second intermediate shaft, and a fifth gear set is provided between the second intermediate shaft and the axle drive shaft.

[0009] In one embodiment of this utility model, a sixth driving gear is provided on the first motor shaft, and the sixth driving gear is connected to the gear ring of the planetary gear mechanism.

[0010] In one embodiment of the present invention, 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, and the outer meshing part meshes with the sixth driving gear.

[0011] In one embodiment of the present invention, the gear ring includes a first ring segment and a second ring segment arranged sequentially along the axial direction. The inner diameter of the second ring segment is larger than the outer diameter of the first ring segment, and the outer peripheral wall of the first ring segment is provided with an outer meshing portion, and the inner peripheral wall of the second ring segment is provided with an inner meshing portion.

[0012] In one embodiment of this utility model, the second motor shaft is loosely fitted onto the first motor shaft, and both the first motor and the second motor are located at the end of the corresponding motor shaft away from the working transmission shaft, and the first gear set is located at the end of the second motor shaft away from the second motor.

[0013] In one embodiment of this utility model, the axle drive shaft includes a front axle section and a rear axle section connected by a second clutch device. The second gear set and the third gear set are both provided corresponding to the rear axle section. The second clutch device is a four-wheel drive clutch and can switch between engaging only the rear axle section and engaging both axle sections.

[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] 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.

[0016] 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 connected to the first motor shaft via a first clutch device. The intermediate transfer shaft is equipped with a planetary gear mechanism. A first gear set meshes with the intermediate transfer shaft and the second motor shaft. The sun gear of the planetary gear mechanism is located on the intermediate transfer shaft, and the ring gear is connected to the first motor shaft. A second gear set and a third gear set with different speed ratios mesh with the planetary carrier, which are offset from the axle drive shaft and are fitted onto the intermediate transfer shaft. A first engagement device is provided on the planetary carrier. The device is configured to engage with one of the second and third gear sets or disengage from both. By adding an intermediate transition shaft and mounting a planetary gear mechanism on it, this invention allows the first and second motors to drive the axle assembly via power coupling and speed decoupling through the planetary gear mechanism. This enables simultaneous operation of stable output speed and high traction. Furthermore, the planetary carrier of the planetary gear mechanism has a second gear set and a third gear set with different speed ratios between it and the axle drive shaft. By controlling the first engagement device, the two motors can switch between two gears in coupled drive mode. In addition, this invention significantly simplifies the structure, reduces production difficulty, and improves reliability.

[0017] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] 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.

[0019] Explanation of reference numerals in the attached figures: 100. Axle drive shaft; 101. Front axle assembly; 102. Rear axle assembly; 110. Front axle section; 120. Rear axle section; 130. Second clutch device; 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; 500. Intermediate transfer shaft; 510. First intermediate shaft; 520. Second intermediate shaft; 530. Second gear Gear set; 531, Second driving 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, First engagement device; 632, Second engagement device; 640, Gear ring; 641, First ring body section; 642, Second ring body section. Detailed Implementation

[0020] 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.

[0021] The dual-motor drive system and agricultural machinery of this utility model are described below with reference to the accompanying drawings.

[0022] like Figure 1 and Figure 2 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 connected to the working device 401 and connected to the first motor shaft 200 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 loosely fitted on the intermediate adapter shaft 500. A second gear set 530 and a third gear set 540 with different speed ratios are provided between the planet carrier 630 and the axle drive shaft 100 for meshing transmission. A first engagement device 631 is provided on the planet carrier 630 to engage with one of the second gear set 530 and the third gear set 540 or to disconnect from both of them.

[0023] 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 connected to the first motor shaft 200 via a first clutch device 410. The intermediate transfer shaft 500 is equipped with a planetary gear mechanism 600. 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. The planet carrier 630 is loosely fitted on the intermediate transfer shaft 500 and is staggered from the axle drive shaft 100 by a second gear set 530 and a third gear set 540 with different speed ratios that mesh with it. The planetary carrier 630 is equipped with a first engagement device 631 to engage with one of the second gear set 530 and the third gear set 540, or to disengage from both. This invention, through the addition of an intermediate transition shaft 500 and the arrangement of 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 planetary carrier 630 of the planetary gear mechanism 600 has a second gear set 530 and a third gear set 540 with different speed ratios between it and the axle drive shaft 100. By controlling the first engagement device 631, the two motors can also switch between two gears in the coupled drive mode. In addition, this invention significantly simplifies the structure, reduces production difficulty, and improves reliability.

[0024] Preferably, the speed ratio of the third gear set 540 is less than that of the second gear set 530. Specifically, the above-mentioned dual-motor transmission system may 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 transmission shaft 400 and the first motor shaft 200, and the first engagement device 631 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 second gear mode of dual-motor coupled travel, the first clutch device 410 switches to disconnect the working drive shaft 400 and the first motor shaft 200, and the first engagement device 631 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 shaft 200, and the first engagement device 631 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 power of the first motor 201 and the second motor 301 is coupled to drive the axle drive shaft 100, realizing simultaneous travel and work.

[0025] 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. In addition, the first clutch device 410 includes, but is not limited to, a clutch, and the first engagement device 631 includes, but is not limited to, one of a shift sleeve, a synchronizer, a sliding sleeve, or a sliding gear.

[0026] In one embodiment of this utility model, a fourth gear set 550 for meshing transmission is further provided between the planetary carrier 630 and the axle drive shaft 100. The speed ratio of the fourth gear set 550 is less than that of the third gear set 540. A second engagement device 632 is provided on the planetary carrier 630 to engage or disengage with the fourth gear set 550. By adding the fourth gear set 550 and the second engagement device 632, the number of gears in the dual-motor power coupling drive can be further expanded to adapt to different working requirements. At the same time, it can also make the gear changes smoother and reduce the sense of jerking during gear shifting.

[0027] Specifically, the dual-motor drive system also has a third gear mode for dual-motor coupled travel. In the first and second gear modes of dual-motor coupled travel, the second engagement device 632 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 working drive shaft 400 and the first motor shaft 200, the first engagement device 631 switches to disconnect from both the second gear set 530 and the third gear set 540, and the second engagement device 632 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 632 includes, but is not limited to, a shift sleeve, a synchronizer, a sliding sleeve, or a sliding gear.

[0028] 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 631 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; that is, there is only one first engagement device 631, which simplifies the structure and control. Of course, 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 631. The second engagement device 632 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 632 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 632 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.

[0029] 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 mounted on the first intermediate shaft 510, and the planet carrier 630 of the planetary gear mechanism 600 is loosely fitted on the first intermediate shaft 510. 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 adapter shaft 500 into two parallel intermediate shafts, the first intermediate shaft 510 and the second intermediate shaft 520, a fifth gear set 560 can be added between the second intermediate shaft 520 and the axle drive shaft 100. The speed ratio of the fifth gear set 560 is set to be greater than 1, thereby achieving the effect of increasing torque.

[0030] 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. The fifth gear set 560 includes a fifth driving gear 561 fixedly connected to the second intermediate shaft 520 and a fifth driven gear 562 fixedly connected to the axle drive shaft 100 and meshing with the fifth driving gear 561.

[0031] In one embodiment of this utility model, a sixth drive gear 210 is provided on the first motor shaft 200, and the sixth drive gear 210 is connected to the gear ring 640 of the planetary gear mechanism 600. That is, by adding the sixth drive gear 210, a transmission connection between the first motor shaft 200 and the gear ring 640 is established. Specifically, the sixth drive gear 210 can be configured to mesh with the gear ring 640, and the sixth drive gear 210 can be fixedly connected to the first motor shaft 200 so that the power of the first motor 201 is always transmitted to the axle drive shaft 100. In addition, a third engagement device can 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 be selectively transmitted to the axle drive shaft 100. When the third engagement device is disconnected from the sixth drive gear 210, the second motor 301 can be controlled to independently drive the axle drive shaft 100 to realize a single motor independent travel mode. Of course, this utility model is not limited to this. It can also be that a structure that meshes with the gear ring 640 can be directly machined on the first motor shaft 200.

[0032] In one embodiment of this utility model, the gear ring 640 has an inner meshing portion and an outer meshing portion on its inner and outer sides, respectively. The inner meshing portion meshes with the planet gear 620 mounted on the planet carrier 630, and the outer meshing portion meshes with the sixth driving gear 210. By machining the inner and outer meshing portions on the inner and outer sides of the gear ring 640, it is possible to facilitate meshing and transmission with the sixth driving gear 210 and the planet gear 620, respectively.

[0033] In one embodiment of this utility model, the gear ring 640 includes a first ring segment 641 and a second ring segment 642 arranged sequentially along the axial direction. The inner diameter of the second ring segment 642 is larger than the outer diameter of the first ring segment 641, and the outer peripheral wall of the first ring segment 641 is provided with an outer meshing portion, while the inner peripheral wall of the second ring segment 642 is provided with an inner meshing portion. Thus, the second ring segment 642 can extend to a position opposite to the sixth driving gear 210, thereby reducing the space occupied by the transmission system.

[0034] In one embodiment of this utility model, the second motor shaft 300 is loosely fitted onto the first motor shaft 200, thereby enabling the two motor shafts to be arranged coaxially, reducing the space occupied by the transmission system and meeting the requirements of compact and simple structure. Of course, it is also possible for the first motor shaft 200 and the second motor shaft 300 to be arranged in parallel with intervals. Meanwhile, the first motor 201 and the second motor 301 are both located at the end of the corresponding motor shaft away from the working transmission shaft 400, that is, the first motor 201 and the second motor 301 are located at the same end. Compared with the prior art where the first motor 201 and the second motor 301 are located on opposite sides of the dual motor coupling device, the electrical signal connection between the motor and the controller is simpler. The first gear set 310 is located at the end of the second motor shaft 300 away from the second motor 301. The gear ring 640 of the planetary gear mechanism 600 is connected to the shaft segment of the first motor shaft 200 that extends from the second motor shaft 300 and extends towards the working transmission shaft 400. That is, the sixth driving gear 210 is located on the end of the first motor shaft 200 that extends from the second motor shaft 300 and is connected to the working transmission shaft 400. In other words, the first gear set 310 and the planetary gear mechanism 600 are both located away from the corresponding motor, so as to shorten the intermediate adapter shaft 500.

[0035] In one embodiment of this utility model, the axle drive shaft 100 includes a front axle section 110 and a rear axle section 120 connected by a second clutch device 130. A second gear set 530 and a third gear set 540 are both disposed corresponding to the rear axle section 120. Specifically, the second gear set 530 and the third gear set 540 are located between the planetary carrier 630 and the second intermediate shaft 520, while a fifth gear set 560 is located between the second intermediate shaft 520 and the rear axle section 120. The second clutch device 130 is a four-wheel drive clutch and can switch between engaging only with the rear axle section 120 and engaging with both axle sections. That is, by adding the second clutch device 130, the transmission system can switch between rear-wheel two-wheel drive and four-wheel drive.

[0036] 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 transfer shaft 500 and meshing with the first driving gear 311. That is, when the second motor 301 starts, the power of the second motor 301 is set to be transmitted only to 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 there may be a situation where the gear on the second motor shaft 300 or the intermediate transfer shaft 500 is loosely fitted, and the engagement device can engage or disengage the loosely fitted gear.

[0037] 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.

[0038] 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 second clutch device 130 is engaged (either two-wheel drive or four-wheel drive is possible), the first engagement device 631 is switched to engage with the second drive gear 531 of the second gear set 530, the second engagement device 632 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 631 - 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 - Sun gear 610 - Planetary gear 620 - Planetary carrier 630 - First engagement device 631 - 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.

[0039] (2) Mode 2: Upon receiving the operation mode instruction, the first clutch device 410 is engaged, the second clutch device 130 is engaged (either two-wheel drive or four-wheel drive is acceptable), the first engagement device 631 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 632 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 coupled drive of the first motor 201 and the second motor 301, so as to realize power coupling traction travel and improve traction force. Power transmission path one is: first motor 201 - first motor shaft 200 - 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 631 - 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 - sun gear 610 - planetary gear 620 - planetary carrier 631 - first engagement device 631 - 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 complex operation needs of agricultural machinery such as rotary tillage, sowing, ditching and baling.

[0040] (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 second clutch device 130 is engaged (either two-wheel drive or four-wheel drive is acceptable), the first engagement device 631 is switched to engage with the third drive gear 541 of the third gear set 540, the second engagement device 632 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 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 motor shaft 200 - Sixth drive gear 210 - Gear ring 640 - Planetary gear 620 - Planetary carrier 630 - First coupling device 631 - Third gear set 540 - 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 - Sun gear 610 - Planetary gear 620 - Planetary carrier 630 - First coupling device 631 - Third gear set 540 - Second intermediate shaft 520 - Fifth gear set 560 - Axle drive shaft 100. Under this mode, agricultural machinery can meet the needs of ditching, baling, and other operations.

[0041] (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 second clutch device 130 is engaged (either two-wheel drive or four-wheel drive is acceptable), the first engagement device 631 is disengaged from the driving gears of the second gear set 530 and the third gear set 540, the second engagement device 632 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 coupled drive of the first motor 201 and the second motor 301 to achieve 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 632 - 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 - Sun gear 610 - Planetary gear 620 - Planetary carrier 630 - Second coupling device 632 - 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.

[0042] (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 201 keeps rotating forward, and the second motor 301 reverses to realize the reverse operation mode.

[0043] Therefore, the dual-motor drive system provided by this utility model has the following advantages: 1. It adopts a single planetary gear mechanism and uses two motors coaxially distributed, which makes the structure compact, relatively simple and highly reliable.

[0044] 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.

[0045] 3. The first motor directly drives the PTO shaft, and the output PTO is continuously variable in speed through a mechanical structure.

[0046] 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, thus decoupling the travel speed from the PTO speed. In the coupled position, switching between low and high speeds is also possible, improving traction, comfort, and reducing shift shock.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 connected to the working device (401) and connected to the first motor shaft (200) 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 located on the intermediate adapter shaft (500), and the ring gear (640) of the planetary gear mechanism (600) is connected to the first motor shaft (200) for transmission. The planetary carrier (630) of the gear mechanism (600) is loosely fitted on the intermediate adapter shaft (500). The planetary carrier (630) and the axle drive shaft (100) are provided with a second gear set (530) and a third gear set (540) with different speed ratios and meshing transmission. The planetary carrier (630) is provided with a first engagement device (631) to engage with one of the second gear set (530) and the third gear set (540) or to disconnect from both of them.

2. The dual-motor drive system according to claim 1, characterized in that, A fourth gear set (550) is also provided between the planetary carrier (630) and the axle drive shaft (100) for meshing transmission. The speed ratio of the fourth gear set (550) is less than that of the third gear set (540). A second engagement device (632) is provided on the planetary carrier (630) to engage or disengage with the fourth gear set (550).

3. The dual-motor drive system according to claim 2, 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 (631) 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 (632) is located on the side of the fourth driving gear (551) of the fourth gear set (550) away from the third driving gear (541).

4. The dual-motor drive system according to claim 1, 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 loosely fitted on 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 the fifth gear set (560) between itself and the axle drive shaft (100).

5. The dual-motor drive system according to claim 1, characterized in that, The first motor shaft (200) is provided with a sixth drive gear (210), which is connected to the gear ring (640) of the planetary gear mechanism (600) in a transmission connection.

6. The dual-motor drive system according to claim 5, characterized in that, 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) on the planet carrier (630) for transmission, and the outer meshing part meshes with the sixth driving gear (210) for transmission.

7. The dual-motor drive system according to claim 6, characterized in that, The gear ring (640) includes a first ring segment (641) and a second ring segment (642) arranged sequentially along the axial direction. The inner diameter of the second ring segment (642) is larger than the outer diameter of the first ring segment (641). The outer peripheral wall of the first ring segment (641) is provided with the outer engagement portion, and the inner peripheral wall of the second ring segment (642) is provided with the inner engagement portion.

8. The dual-motor drive system according to any one of claims 1 to 7, characterized in that, The second motor shaft (300) is loosely fitted onto the first motor shaft (200), and both the first motor (201) and the second motor (301) are located at the end of the corresponding motor shaft away from the working transmission shaft (400), and the first gear set (310) is located at the end of the second motor shaft (300) away from the second motor (301).

9. The dual-motor drive system according to any one of claims 1 to 7, characterized in that, The axle drive shaft (100) includes a front axle section (110) and a rear axle section (120) connected by a second clutch device (130). The second gear set (530) and the third gear set (540) are both provided corresponding to the rear axle section (120). The second clutch device (130) is a four-wheel drive clutch and can switch between engaging only with the rear axle section (120) and engaging with both axle sections. And / or, the first gear set (310) includes a first drive 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 drive gear (311).

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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