Dual-motor multi-mode hybrid power transmission device with fixed gears

Abstract

The invention provides a dual-motor multi-mode hybrid power transmission device with fixed gears, which relates to the technical field of hybrid electric vehicles and comprises an input shaft, an output shaft, a planetary gear assembly and a torque transmission device. The planetary gear assembly comprises three planetary gear rows, the second gear ring is fixedly arranged, the first gear ring is fixedly connected with the third gear ring, and the second planet carrier is fixedly connected with the third sun gear; a first clutch in the torque transmission device is connected with an input shaft and a first gear ring, a second clutch is connected with a second sun gear and a third planet carrier, a third clutch is connected with a first planet carrier and a third planet carrier, and a brake is connected with the first sun gear; one end of the input shaft is connected with the first planet carrier; the first sun gear is connected with a first motor; the third gear ring is connected with a second motor; the output shaft is connected with a second sun gear; the clutch and the brake are selectively engaged to adjust the output mode. The method has the beneficial effects that the working interval of the engine is optimized; the axial size is compact, and control is easy and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid electric vehicles, and in particular to a dual-motor multi-mode hybrid electric transmission device with fixed gears. Background Art

[0002] Currently, mainstream hybrid powertrain architectures primarily encompass series, parallel, and hybrid approaches. Power-split hybrid systems, particularly those based on planetary gear mechanisms, are considered a solution with high technical complexity and excellent overall performance, as they effectively expand the engine's efficient operating range and provide a smooth driving experience similar to continuously variable transmissions. Toyota's THS system, a prime example, has achieved significant market success, demonstrating the technology's maturity and efficiency.

[0003] However, traditional single-mode or dual-mode power split systems still have potential for optimization. For example, to broaden the operating conditions and further improve system efficiency, some research is focusing on developing hybrid transmissions that integrate more operating modes. By introducing additional planetary gear rows, clutches, brakes, and multiple motors, a variety of drive modes can be achieved, including pure electric, series, parallel, multiple power splits, and fixed mechanical gears. Among them, the introduction of fixed mechanical gears allows the engine power to be transmitted through a highly efficient purely mechanical path under specific operating conditions such as high-speed cruising, avoiding energy conversion losses during the power split process, thereby significantly optimizing high-speed fuel economy.

[0004] However, with the continuous improvement of requirements for vehicle dynamics, smoothness and intelligent control, how to ensure functional diversity while achieving compactness and lightweight structure through more sophisticated structural design and coordinated optimization control strategies, and ensuring smooth switching quality between various operating modes has become a difficult problem for breakthroughs in hybrid powertrain technology. Summary of the Invention

[0005] In view of this, in order to achieve a compact and lightweight hybrid power transmission device and smooth switching between modes, an embodiment of the present invention provides a dual-motor multi-mode hybrid power transmission device with fixed gears.

[0006] An embodiment of the present invention provides a dual-motor multi-mode hybrid power transmission with fixed gears, comprising an input shaft, an output shaft, a planetary gear assembly, and a torque transfer device; The planetary gear assembly includes a first planetary gear row, a second planetary gear row, and a third planetary gear row arranged in sequence from front to back, the first planetary gear row includes a first ring gear, a first planetary gear, a first planetary carrier, and a first sun gear, the second planetary gear row includes a second ring gear, a second planetary gear, a second planetary carrier, and a second sun gear, the third planetary gear row includes a third ring gear, a third planetary gear, a third planetary carrier, and a third sun gear, the second ring gear is fixedly arranged, the first ring gear is fixedly connected to the third ring gear, and the second planetary carrier is fixedly connected to the third sun gear; The torque transmission device includes a first clutch, a second clutch, a third clutch and a brake, the first clutch connecting the input shaft and the first ring gear, the second clutch connecting the second sun gear and the third planet carrier, the third clutch connecting the first planet carrier and the third planet carrier, and the brake connecting the first sun gear; One end of the input shaft is connected to the first planet carrier, and the other end is used to connect to the engine; The first sun gear is used to connect to the first motor; The third ring gear is used to connect to the second motor; The output shaft is connected to the second sun gear; The first clutch, the second clutch, the third clutch, and the brake are selectively engaged to adjust a power output mode of the transmission.

[0007] Furthermore, it also includes an engine, a first motor and a second motor, the engine is connected to the input shaft, the first motor is connected to the first sun gear, and the second motor is connected to the third ring gear.

[0008] Furthermore, the second clutch is engaged, the second motor is started, and the output shaft outputs in a pure electric mode.

[0009] Furthermore, the first clutch and the second clutch are engaged, the engine, the first motor and the second motor are started, and the output shaft outputs in an input-split mode.

[0010] Furthermore, the first clutch, the second clutch, and the third clutch are engaged, the engine, the first motor, and the second motor are started, and the output shaft outputs in a compound-split mode.

[0011] Furthermore, only the engine is started, and five fixed gear modes are achieved by controlling the working states of the clutch and the brake.

[0012] Furthermore, the five fixed gear modes are as follows: First gear operating mode: the first clutch and the second clutch are engaged to establish a first reduction gear ratio between the input shaft and the output shaft; Second gear operating mode: the second clutch and brake are engaged to establish a second downshift gear ratio between the input shaft and the output shaft; Third gear operating mode: the second clutch and the third clutch are engaged to establish a third direct gear transmission ratio between the input shaft and the output shaft; Fourth gear operating mode: the third clutch and brake are engaged to establish a fourth overdrive gear ratio between the input shaft and the output shaft; Fifth gear operating mode: the first clutch and the third clutch are engaged to establish a fifth overdrive gear ratio between the input shaft and the output shaft.

[0013] Furthermore, the second clutch and the brake are engaged to start the engine to reverse and establish reverse gear.

[0014] Furthermore, it also includes a housing, the planetary gear assembly and the torque transmission device are both arranged in the housing, and the second ring gear and the brake are both fixedly connected to the housing.

[0015] Furthermore, the first clutch, the second clutch and the third clutch are multi-plate wet clutches or dog clutches, and the brake is a drum brake or a multi-plate wet brake.

[0016] The beneficial effects brought about by the technical solution provided by the embodiments of the present invention are: 1. The present invention discloses a dual-motor, multi-mode hybrid transmission with fixed gears. Its planetary gear assembly comprises three planetary gear rows arranged in a front-to-rear direction. The transmission's power output mode can be adjusted by selectively engaging a first clutch, a second clutch, a third clutch, and a brake. A pure electric mode addresses urban congestion and short-distance travel, while an input-split mode and a combined-split mode cater to low- and high-speed driving requirements, respectively. In these modes, the engine and dual motors work in tandem, intelligently optimizing the engine's operating range. This significantly improves fuel economy and provides a driving experience as smooth and fluid as a continuously variable transmission.

[0017] 2. A dual-motor multi-mode hybrid power transmission device with fixed gears according to the present invention, The precise combination of a Simpson mechanism, three planetary gear rows, and multiple clutches and brakes achieves a high degree of functional integration within a limited structural space. Compared to traditional solutions, this design offers a more compact axial dimension, demonstrating superior engineering design. The functions of the generator and drive motor are deeply integrated into the transmission system, creating a highly mechatronic powertrain.

[0018] 3. A dual-motor multi-mode hybrid power transmission device with fixed gears according to the present invention, It integrates multiple fixed mechanical gears, namely two-stage reduction gears, one-stage direct gear and two-stage overdrive gears, so that when the engine is driven alone or under conditions with high transmission efficiency requirements, the system can select the optimal mechanical transmission path, further reducing energy consumption and enhancing power performance. At the same time, the reverse gear mode achieved by the present invention through motor reversal is not only simple to control but also more responsive. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a transmission principle diagram of a dual-motor multi-mode hybrid power transmission device with fixed gears according to the present invention; Figure 2 This is a working logic diagram of a dual-motor multi-mode hybrid power transmission device with fixed gears according to the present invention.

[0020] In the figure: 1. Engine; 2. First motor; 3. Second motor; 4. First ring gear; 5. First planetary gear; 6. First planetary carrier; 7. First sun gear; 8. Second ring gear; 9. Second planetary gear; 10. Second planetary carrier; 11. Second sun gear; 12. Third ring gear; 13. Third planetary gear; 14. Third planetary carrier; 15. Third sun gear; 16. Output shaft; 17. Input shaft; 18. Housing; B1. Brake; C1. First clutch; C2. Second clutch; C3. Third clutch. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the present invention more apparent, embodiments of the present invention will be further described below with reference to the accompanying drawings. The following describes a preferred embodiment of the present invention among multiple possible embodiments, which is intended to provide a basic understanding of the present invention but is not intended to identify the key or decisive elements of the present invention or to limit the scope of protection.

[0022] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0023] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual scale.

[0025] It should be noted that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0026] Please refer to Figure 1 An embodiment of the present invention provides a dual-motor multi-mode hybrid power transmission device with fixed gears, which is applied to hybrid vehicles and mainly includes an input shaft 17, an output shaft 16, a planetary gear assembly and a torque transmission device.

[0027] The planetary gear assembly includes a first planetary gear row, a second planetary gear row, and a third planetary gear row arranged in sequence from front to back. Each planetary gear row is composed of a sun gear, a planet carrier, planetary gears, and a ring gear. Specifically: The first planetary gear row includes a first ring gear 4, a first planetary gear 5, a first planetary carrier 6 and a first sun gear 7. The first sun gear 7 and the first planetary gear 5 are externally meshed for transmission, and the first planetary gear 5 and the first ring gear 4 are internally meshed for transmission. The first planetary gear 5 is rotatably mounted on the first planetary carrier 6.

[0028] The second planetary gear train includes a second ring gear 8, second planetary gears 9, a second planet carrier 10, and a second sun gear 11. The second sun gear 11 and the second planetary gears 9 are externally meshed for transmission, while the second planetary gears 9 and the second ring gear 8 are internally meshed for transmission. The second planetary gears 9 are rotatably mounted on the second planet carrier 10. The second ring gear 8 is fixed and cannot rotate.

[0029] The third planetary gear row includes a third ring gear 12, third planetary gears 13, a third planet carrier 14, and a third sun gear 15. The third sun gear 15 and the third planetary gears 13 are externally meshed for transmission, while the third planetary gears 13 and the third ring gear 12 are internally meshed for transmission. The third planetary gears 13 are rotatably mounted on the third planet carrier 14. The first ring gear 4 is fixedly connected to the third ring gear 12, and the first ring gear 4 and the third ring gear 12 rotate together. The second planet carrier 10 is fixedly connected to the third sun gear 15, and the second planet carrier 10 and the third sun gear 15 rotate together.

[0030] The torque transmission device includes a first clutch C1, a second clutch C2, a third clutch C3, and a brake B1. The first clutch C1 connects the input shaft 17 and the first ring gear 4. Engaging the first clutch C1 allows the input shaft 17 to rotate together with the first ring gear 4. The second clutch C2 connects the second sun gear 11 and the third planetary carrier 14. Engaging the second clutch C2 allows the second sun gear 11 and the third planetary carrier 14 to rotate together. The third clutch C3 connects the first planetary carrier 6 and the third planetary carrier 14. Engaging the third clutch C3 allows the first planetary carrier 6 and the third planetary carrier 14 to rotate together. The brake B1 connects the first sun gear 7. Engaging the brake B1 fixes the first sun gear 7, preventing it from rotating.

[0031] In this embodiment, the first clutch C1, the second clutch C2, and the third clutch C3 are multi-plate wet clutches or dog clutches, and the brake B1 is a drum brake or a multi-plate wet brake. It will be appreciated that the first clutch C1, the second clutch C2, and the third clutch C3 may also be other types of clutches, and the brake B1 may also be other types of brakes, depending on actual application needs.

[0032] Generally, a dual-motor multi-mode hybrid transmission device with fixed gears of the present invention further includes a housing 18, the planetary gear assembly and the torque transmission device are both arranged in the housing 18, and the second ring gear 8 and the brake B1 are both fixedly connected to the housing 18.

[0033] One end of the input shaft 17 is connected to the first planetary carrier 6, and the other end is used to connect to the engine 1. The engine 1 can drive the first planetary carrier 6 to rotate. The first sun gear 7 is used to connect to the first motor 2. The first motor 2 can drive the first sun gear 7 to rotate. The third ring gear 12 is used to connect to the second motor 3. The second motor 3 can drive the third ring gear 12 to rotate. The output shaft 16 is connected to the second sun gear 11. The rotation of the second sun gear 11 can drive the output shaft 16 to rotate. In actual application, at least one of the engine 1, the first motor 2, and the second motor 3 inputs power, and the output shaft 16 can output power to the vehicle to drive the vehicle.

[0034] The first clutch C1 , the second clutch C2 , the third clutch C3 , and the brake B1 are selectively engaged to adjust a power output mode of the transmission.

[0035] When a dual-motor multi-mode hybrid transmission device with fixed gears is applied to a hybrid vehicle, it generally includes an engine 1, a first motor 2, and a second motor 3. The engine 1 is connected to the input shaft 17, the first motor 2 is connected to the first sun gear 7, and the second motor 3 is connected to the third ring gear 12. Figure 2 As shown, the first clutch C1, the second clutch C2, the third clutch C3 and the brake B1 are selectively engaged to cooperate with the partial or full power output of the engine 1, the first motor 2 and the second motor 3 to achieve different modes of power output, as follows: Pure Electric Mode: The second clutch C2 is engaged, the second motor 3 is started, and the output shaft 16 operates in pure electric mode. Specifically, engagement of the second clutch C2 causes the second sun gear 11 and the third planetary carrier 14 to rotate together. The second motor 3 drives the third ring gear 12, which in turn rotates the third planetary gear set. The rotation of the third planetary carrier 14 drives the second sun gear 11, which in turn drives the output shaft 16. Simultaneously, the third planetary gear set rotates, and the third sun gear 15 drives the second planetary carrier 10, which in turn rotates the second planetary gear set. Consequently, the rotation of the second sun gear 11 drives the output shaft 16, driving the vehicle.

[0036] Input-Split Type: The first clutch C1 and the second clutch C2 are engaged, the engine 1, the first motor 2, and the second motor 3 are started, and the output shaft 16 operates in an input-split type. Specifically, engagement of the first clutch C1 causes the input shaft 17 to rotate together with the first ring gear 4. Engagement of the second clutch C2 causes the second sun gear 11 and the third planetary carrier 14 to rotate together. The engine 1 drives the first planetary carrier 6 and the first ring gear 4 to rotate, respectively. The first planetary gear set operates, with a portion of the power being transferred from the first ring gear 4 to the third ring gear 12, driving the third planetary gear set. Another portion of the power is transferred from the first sun gear 7 to the first motor 2, driving the first motor 2 to rotate and converting it into electrical energy. This electrical energy then drives the second motor 3, which in turn drives the third ring gear 12, driving the third planetary gear set. This rotation of the third planetary carrier 14 drives the second sun gear 11, which in turn drives the output shaft 16. Simultaneously, the third sun gear 15 drives the second planetary carrier 10, operating the second planetary gear set. This, in turn, drives the second sun gear 11 and the output shaft 16. The input-split type is suitable for vehicle starting and low-speed driving.

[0037] Compound-split mode: The first, second, and third clutches C1, C2, and C3 are engaged, the engine 1, the first and second motors 2, and 3 are started, and the output shaft 16 operates in compound-split mode. Specifically, the first clutch C1 is engaged, causing the input shaft 17 to rotate together with the first ring gear 4. The second clutch C2 is engaged, causing the second sun gear 11 and the third planetary carrier 14 to rotate together. The third clutch C3 is engaged, causing the first and third planetary carriers 6 and 14 to rotate together. The engine 1 drives the first planetary carrier 6 and the first ring gear 4 to rotate, respectively, causing the first planetary gear set to operate. A portion of the power is transferred from the first ring gear 4 to the third ring gear 12, and a portion of the power is transferred from the first planetary carrier 6 to the third planetary carrier 14, causing the third planetary gear set to operate. The remaining power is transferred from the first sun gear 7 to the first motor 2, driving the first motor 2 to rotate and converting it into electrical energy. This electrical energy then drives the second motor 3, which in turn drives the third ring gear 12, thereby driving the third planetary gear set to operate. The rotation of the third planetary carrier 14 drives the second sun gear 11, which in turn drives the output shaft 16. Simultaneously, the rotation of the third sun gear 15 drives the second planetary carrier 10, causing the second planetary gear set to operate. The rotation of the second sun gear 11 drives the output shaft 16. The compound split mode achieves multi-path power coupling and is suitable for vehicles traveling at medium and high speeds.

[0038] In addition, the dual-motor multi-mode hybrid transmission with fixed gears of the present invention can also start only the engine 1 and realize five fixed gear modes by controlling the working state of the clutch and brake B1. The five fixed gear modes are as follows: First Gear Operating Mode: The first clutch C1 and the second clutch C2 are engaged to establish a first downshift gear ratio between the input shaft 17 and the output shaft 16. Specifically, engagement of the first clutch C1 causes the input shaft 17 to rotate together with the first ring gear 4. Engagement of the second clutch C2 causes the second sun gear 11 and the third planetary carrier 14 to rotate together. The engine 1 drives the first ring gear 4 and the first planetary carrier 6 to rotate, respectively. The first ring gear 4 drives the third ring gear 12 to rotate, causing the third planetary gear set to rotate. The third planetary carrier 14 drives the second sun gear 11 to rotate, driving the output shaft 16. Furthermore, the operation of the third planetary gear set causes the third sun gear 15 to rotate the second planetary carrier 10. The second planetary gear set operates, and the second sun gear 11 rotates, driving the output shaft 16. Thus, a first downshift gear ratio is established between the input shaft 17 and the output shaft 16. First Gear is a downshift gear.

[0039] Second gear operating mode: The second clutch C2 and brake B1 are engaged to establish a second downshift gear ratio between the input shaft 17 and the output shaft 16. Specifically, engagement of the second clutch C2 causes the second sun gear 11 and the third planetary carrier 14 to rotate together. Engaging the brake B1 immobilizes the first sun gear 7, preventing it from rotating. The engine 1 drives the first planetary carrier 6 to rotate, driving the first planetary gear set. The first ring gear 4 drives the third ring gear 12 to rotate, driving the third planetary gear set. The third planetary carrier 14 drives the second sun gear 11 to rotate, driving the output shaft 16. Furthermore, the operation of the third planetary gear set causes the third sun gear 15 to rotate the second planetary carrier 10. The second planetary gear set operates, and the rotation of the second sun gear 11 drives the output shaft 16. Thus, a second downshift gear ratio is established between the input shaft 17 and the output shaft 16, making second gear a downshift gear.

[0040] In third gear operating mode, the second clutch C2 and the third clutch C3 engage to establish a third direct gear ratio between the input shaft 17 and the output shaft 16. Specifically, engagement of the second clutch C2 causes the second sun gear 11 and the third planet carrier 14 to rotate together. Engagement of the third clutch C3 causes the first planet carrier 6 and the third planet carrier 14 to rotate together. The engine 1 drives the first planet carrier 6 to rotate, which in turn drives the third planet carrier 14 to rotate. The third planet carrier 14 drives the second sun gear 11 to rotate, which in turn drives the output shaft 16. Simultaneously, the rotation of the first planet carrier 6 drives the first planetary gear set, which in turn drives the third ring gear 12, which in turn drives the third planetary gear set. This in turn drives the third sun gear 15 to rotate the second planet carrier 10, which in turn drives the second planetary gear set. The rotation of the second sun gear 11 drives the output shaft 16. Thus, a third direct gear ratio is established between the input shaft 17 and the output shaft 16. Third gear is a direct gear suitable for medium- and high-speed cruising conditions.

[0041] Fourth gear operating mode: The third clutch C3 and brake B1 are engaged to establish a fourth overdrive gear ratio between the input shaft 17 and the output shaft 16. Specifically, engagement of the third clutch C3 causes the first planet carrier 6 and the third planet carrier 14 to rotate together. Engaging the brake B1 immobilizes the first sun gear 7, preventing it from rotating. The engine 1 drives the first planet carrier 6 to rotate, which in turn drives the third planet carrier 14, which in turn drives the third planetary gear set. Simultaneously, the rotation of the first planet carrier 6 drives the first planetary gear set, and the first ring gear 4 drives the third ring gear 12, which in turn drives the third planetary gear set. The rotation of the third planetary gear set causes the third sun gear 15 to rotate the second planet carrier 10, which in turn drives the second planetary gear set. The rotation of the second sun gear 11 drives the output shaft 16, thereby establishing a fourth overdrive gear ratio between the input shaft 17 and the output shaft 16. Fourth gear is an overdrive gear.

[0042] Fifth gear operating mode: The first clutch C1 and the third clutch C3 are engaged to establish a fifth overdrive gear ratio between the input shaft 17 and the output shaft 16. Specifically, engagement of the first clutch C1 causes the input shaft 17 to rotate together with the first ring gear 4. Engagement of the third clutch C3 causes the first planet carrier 6 and the third planet carrier 14 to rotate together. The engine 1 drives the first planet carrier 6 and the first ring gear 4 to rotate, respectively. The first planet carrier 6 drives the third planet carrier 14, which in turn drives the third planetary gear set. Simultaneously, the first ring gear 4 drives the third ring gear 12, which in turn drives the third planetary gear set. The rotation of the third planetary gear set causes the third sun gear 15 to rotate the second planet carrier 10, which in turn drives the second planetary gear set. The rotation of the second sun gear 11 drives the output shaft 16, thereby establishing a fifth overdrive gear ratio between the input shaft 17 and the output shaft 16. Fifth gear is an overdrive gear.

[0043] It should be noted that in the dual-motor multi-mode hybrid transmission device with fixed gears of the present invention, only two torque transfer components (clutches or brakes) need to be engaged for the five fixed gear modes, and switching of modes or gears only requires replacing one torque transfer component. The coordination strategy of the control logic and the actuator is simple, and the mode or gear switching is smooth.

[0044] Considering the issue of reversing, the dual-motor, multi-mode hybrid transmission with fixed gears of the present invention can also implement a reverse mode. Engaging the second clutch C2 and the brake B1 initiates reverse rotation of the engine 1, establishing reverse gear. Specifically, engaging the second clutch C2 causes the second sun gear 11 and the third planetary carrier 14 to rotate together. Engaging the brake B1 immobilizes the first sun gear 7, preventing it from rotating. The engine 1 reverses, driving the first planetary carrier 6 to rotate, which in turn drives the first planetary gear set. The first ring gear 4 drives the third ring gear 12 to rotate, which in turn drives the third planetary gear set. The third planetary carrier 14 drives the second sun gear 11 to rotate, thereby driving the output shaft 16. Furthermore, the operation of the third planetary gear set causes the third sun gear 15 to rotate the second planetary carrier 10. The second planetary gear set rotates, and the second sun gear 11 rotates, driving the output shaft 16. This establishes reverse gear, enabling the vehicle to reverse.

[0045] In this document, directional terms such as front, back, top, and bottom are defined based on the positions of components in the accompanying drawings and relative to each other, and are intended for clarity and convenience in describing the technical solution. It should be understood that these terms are relative and may vary depending on usage and placement. The use of these directional terms should not limit the scope of protection claimed in this application.

[0046] The above embodiments and features of the embodiments may be combined with each other unless they conflict. The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A dual-motor multi-mode hybrid power transmission with fixed gears, characterized by: including an input shaft, an output shaft, a planetary gear assembly, and a torque transmitting device; The planetary gear assembly includes a first planetary gear row, a second planetary gear row, and a third planetary gear row arranged in sequence from front to back, the first planetary gear row includes a first ring gear, a first planetary gear, a first planetary carrier, and a first sun gear, the second planetary gear row includes a second ring gear, a second planetary gear, a second planetary carrier, and a second sun gear, the third planetary gear row includes a third ring gear, a third planetary gear, a third planetary carrier, and a third sun gear, the second ring gear is fixedly arranged, the first ring gear is fixedly connected to the third ring gear, and the second planetary carrier is fixedly connected to the third sun gear; The torque transmission device includes a first clutch, a second clutch, a third clutch and a brake, the first clutch connecting the input shaft and the first ring gear, the second clutch connecting the second sun gear and the third planet carrier, the third clutch connecting the first planet carrier and the third planet carrier, and the brake connecting the first sun gear; One end of the input shaft is connected to the first planet carrier, and the other end is used to connect to the engine; The first sun gear is used to connect to the first motor; The third ring gear is used to connect to the second motor; The output shaft is connected to the second sun gear; The first clutch, the second clutch, the third clutch, and the brake are selectively engaged to adjust a power output mode of the transmission.

2. The dual-motor multi-mode hybrid power transmission device with fixed gears according to claim 1, characterized in that: The system further includes an engine, a first motor and a second motor, wherein the engine is connected to the input shaft, the first motor is connected to the first sun gear, and the second motor is connected to the third ring gear.

3. The dual-motor multi-mode hybrid power transmission with fixed gears according to claim 2, characterized in that: The second clutch is engaged, the second motor is started, and the output shaft outputs in a pure electric mode.

4. The dual-motor multi-mode hybrid power transmission device with fixed gears according to claim 2, characterized in that: The first clutch and the second clutch are engaged, the engine and the first and second motors are started, and the output shaft outputs in an input-split mode.

5. The dual-motor multi-mode hybrid power transmission device with fixed gears according to claim 2, characterized in that: The first clutch, the second clutch, and the third clutch are engaged, the engine, the first electric machine, and the second electric machine are started, and the output shaft outputs in a compound-split mode.

6. The dual-motor multi-mode hybrid power transmission device with fixed gears according to claim 2, characterized in that: Only the engine is started, and five fixed gear modes are achieved by controlling the working states of the clutch and the brake.

7. A dual-motor multi-mode hybrid power transmission device with fixed gears as claimed in claim 6, characterized in that: The five fixed gear modes are as follows: First gear operating mode: the first clutch and the second clutch are engaged to establish a first reduction gear ratio between the input shaft and the output shaft; Second gear operating mode: the second clutch and brake are engaged to establish a second downshift gear ratio between the input shaft and the output shaft; Third gear operating mode: the second clutch and the third clutch are engaged to establish a third direct gear transmission ratio between the input shaft and the output shaft; Fourth gear operating mode: the third clutch and brake are engaged to establish a fourth overdrive gear ratio between the input shaft and the output shaft; Fifth gear operating mode: the first clutch and the third clutch are engaged to establish a fifth overdrive gear ratio between the input shaft and the output shaft.

8. The dual-motor multi-mode hybrid power transmission device with fixed gears according to claim 2, characterized in that: The second clutch and the brake are engaged to start the engine to rotate in reverse and establish reverse gear.

9. The dual-motor multi-mode hybrid power transmission device with fixed gears according to claim 1, characterized in that: It also includes a housing, the planetary gear assembly and the torque transmission device are both arranged in the housing, and the second ring gear and the brake are both fixedly connected to the housing.

10. The dual-motor multi-mode hybrid power transmission device with fixed gears according to claim 1, characterized in that: The first clutch, the second clutch and the third clutch are multi-plate wet clutches or dog clutches, and the brake is a drum brake or a multi-plate wet brake.

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