Double-planet-row double-mode hybrid power transmission device

Abstract

The invention provides a double-planet-row double-mode hybrid power transmission device, which relates to a hybrid electric vehicle and comprises an input shaft, an output shaft, a planet gear assembly and a torque transmission device, the planetary gear assembly comprises a first planetary gear row and a second planetary gear row, and the first sun gear is fixedly connected with the second 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 first gear ring and a second gear ring, a first brake is connected with a first sun gear, and a second brake is connected with a second gear ring. One end of the input shaft is connected with the first planet carrier; the first gear ring is connected with a first motor; the second sun gear is connected with a second motor; the output shaft is connected with the second planet carrier; the clutch and the brake are selectively engaged to adjust the output mode. The transmission mechanism has the beneficial effects that the transmission ratio range is large, the transmission efficiency is high, the axial size is small, the structure is simple and compact, mode or gear switching is smooth, and the control logic is concise.

Description

Technical Field

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

[0002] Hybrid powertrain technology, as a key approach to improving vehicle fuel economy and reducing emissions, has garnered widespread attention in recent years. Power-split hybrid systems, which enable efficient synergy between the engine and motor under varying operating conditions, have gradually become the mainstream development direction.

[0003] However, traditional single-mode power-split hybrid systems often only support a single power-split mode, making them difficult to meet complex and changing driving requirements. This is especially true in extreme driving conditions, such as high speeds and hill climbing, where the system's energy efficiency and drivability are limited. To improve overall system adaptability and energy efficiency, dual-mode power-split hybrid systems have emerged. By incorporating a multi-speed structure and shift control strategy, they enable flexible switching between different power paths and transmission modes, balancing low-speed high torque with high-speed, efficient transmission.

[0004] In existing dual-mode power-split hybrid systems, the transmission devices are mostly immature, with complex structures, high control difficulty, and difficulty in achieving a good balance in system efficiency and control logic complexity. In addition, the transmission ratio range covered is narrow, making it difficult to meet the comprehensive requirements of torque and speed under different driving conditions. Summary of the Invention

[0005] In view of this, in order to solve the above problems of dual-mode power split hybrid system, An embodiment of the present invention provides a dual-planetary gear dual-mode hybrid power transmission device.

[0006] An embodiment of the present invention provides a dual-planetary gear dual-mode hybrid power transmission device, comprising an input shaft, an output shaft, a planetary gear assembly, and a torque transmission device; The planetary gear assembly includes a first planetary gear row and a second 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, and the first sun gear is fixedly connected to the second sun gear; The torque transmission device includes a first clutch, a second clutch, a first brake, and a second brake, wherein the first clutch connects the input shaft and the first ring gear, the second clutch connects the first ring gear and the second ring gear, the first brake connects the first sun gear, and the second brake connects the second ring 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 ring gear is used to connect to the first motor; The second sun gear is used to connect to the second motor; The output shaft is connected to the second planet carrier; The first clutch, the second clutch, the first brake, and the second 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 ring gear, and the second motor is connected to the second sun gear.

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

[0009] Further, the second brake is 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 second clutch is engaged, the engine, the first motor, and the second motor are started, and the output shaft outputs power in a compound-split mode.

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

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

[0013] Furthermore, the second brake is engaged, the second motor is started, and the reverse gear is established.

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

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

[0016] The beneficial effects brought about by the technical solution provided by the embodiments of the present invention are: 1. A dual-planetary gear, dual-mode hybrid power transmission of the present invention employs a dual-planetary gear structure, wherein a first planetary gear row and a second planetary gear row are arranged in a front-to-rear direction. A first clutch, a second clutch, and a first brake and a second brake are selectively engaged, thereby adjusting the power output mode of the transmission to realize a pure electric mode, an input split mode, a compound split mode, and four fixed gear modes. The input split mode and the compound split mode meet the different requirements of low-speed and high-speed vehicle driving, and the four fixed gear modes meet the operating requirements of the vehicle when no electric power is involved. The transmission has a wide transmission ratio range, high transmission efficiency, a small axial dimension, and a simple and compact structure.

[0017] 2. The dual-planetary gear dual-mode hybrid transmission device of the present invention requires only one torque transfer member (clutch or brake) to be engaged in switching control among pure electric mode, input split mode, and compound split mode, while only two torque transfer members (clutches or brakes) need to be engaged in the four fixed gear modes. Moreover, only one torque transfer member needs to be replaced when changing modes and gears. This device features simple control, smooth mode or gear switching, concise control logic, and a good balance between system efficiency and control logic complexity, facilitating system integration with the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a transmission principle diagram of a dual-planetary gear dual-mode hybrid power transmission device of the present invention; Figure 2 This is a working logic diagram of a dual-planetary gear dual-mode hybrid power transmission device of the present invention.

[0019] In the figure: 1. Engine; 2. First motor; 3. Second motor; 4. Output shaft; 5. First ring gear; 6. First planetary gear; 7. First planetary carrier; 8. First sun gear; 9. Second ring gear; 10. Second planetary gear; 11. Second planetary carrier; 12. Second sun gear; 13. Input shaft; 14. Housing; B1. First brake; B2. Second brake; C1. First clutch; C2. Second clutch. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Please refer to Figure 1 An embodiment of the present invention provides a dual-planetary gear dual-mode hybrid power transmission device, which is applied to hybrid vehicles and mainly includes an input shaft 13, an output shaft 4, a planetary gear assembly and a torque transmission device.

[0026] The planetary gear assembly includes a first planetary gear row and a second planetary gear row arranged in sequence from front to back. Each planetary gear row is composed of a sun gear, a planet carrier, a planetary gear and a ring gear. Specifically, The first planetary gear train includes a first ring gear 5, first planetary gears 6, a first planet carrier 7, and a first sun gear 8. The first sun gear 8 and the first planetary gears 6 are externally meshed for transmission, while the first planetary gears 6 and the first ring gear 5 are internally meshed for transmission. The first planetary gears 6 are rotatably supported on the first planet carrier 7.

[0027] The second planetary gear train includes a second ring gear 9, second planetary gears 10, a second planet carrier 11, and a second sun gear 12. The second sun gear 12 and the second planetary gears 10 are externally meshed, while the second planetary gears 10 and the second ring gear 9 are internally meshed. The second planetary gears 10 are rotatably supported on the second planet carrier 11. Furthermore, the first sun gear 8 and the second sun gear 12 are fixedly connected, and the first sun gear 8 and the second sun gear 12 rotate together.

[0028] The torque transmission device includes a first clutch C1, a second clutch C2, a first brake B1, and a second brake B2. The first clutch C1 connects the input shaft 13 and the first ring gear 5, the second clutch C2 connects the first ring gear 5 and the second ring gear 9, the first brake B1 connects the first sun gear 8, and the second brake B2 connects the second ring gear 9.

[0029] In this embodiment, the first clutch C1 and the second clutch C2 are multi-plate wet clutches or dog clutches, and the first brake B1 and the second brake B2 are drum brakes or multi-plate wet brakes. It is understood that the first clutch C1 and the second clutch C2 may be other types of clutches, and the first brake B1 and the second brake B2 may be other types of brakes, depending on actual application needs.

[0030] Generally, a dual-planetary gear dual-mode hybrid transmission device of the present invention further includes a housing 14 , the planetary gear assembly and the torque transfer device are both disposed in the housing 14 , and the first brake B1 and the second brake B2 are fixedly installed in the housing 14 .

[0031] One end of the input shaft 13 is connected to the first planetary carrier 7, and the other end is used to connect to the engine 1. The engine 1 can drive the first planetary carrier 7 to rotate. The first ring gear 5 is used to connect to the first motor 2. The first motor 2 can drive the first ring gear 5 to rotate. The second sun gear 12 is used to connect to the second motor 3. The second pole can drive the second sun gear 12 to rotate. The output shaft 4 is connected to the second planetary carrier 11. The rotation of the second planetary carrier 11 can drive the output shaft 4 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 4 can output power to the vehicle to drive the vehicle.

[0032] The first clutch C1 , the second clutch C2 , the first brake B1 , and the second brake B2 are selectively engaged to adjust a power output mode of the transmission.

[0033] The dual-planetary gear dual-mode hybrid transmission device of the present invention, when applied to a hybrid vehicle, generally includes an engine 1, a first motor 2, and a second motor 3. The engine 1 is connected to the input shaft 13, the first motor 2 is connected to the first ring gear 5, and the second motor 3 is connected to the second sun gear 12. Figure 2 As shown, the first clutch C1, the second clutch C2, the first brake B1 and the second brake B2 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 brake B2 is engaged, the second motor 3 is started, and the output shaft 4 operates in pure electric mode. Specifically, the engagement of the second brake B2 locks the second ring gear 9, preventing it from rotating. The second motor 3 drives the second sun gear 12 to rotate, which in turn rotates the second planetary gear set, rotating the second planet carrier 11 and thus the output shaft 4, thereby driving the vehicle.

[0034] Input-split mode: The second brake B2 is engaged, the engine 1, the first motor 2, and the second motor 3 are started, and the output shaft 4 operates in input-split mode. Specifically, the engagement of the second brake B2 locks the second ring gear 9, preventing it from rotating. The engine 1 drives the first planetary carrier 7, which in turn rotates the first planetary gear set. A portion of the power is transferred from the first sun gear 8 to the second sun gear 12. The rotation of the second sun gear 12 drives the second planetary gear set, which in turn rotates the second planetary carrier 11 and drives the output shaft 4. Simultaneously, another portion of the power is transferred from the first ring gear 5 to the first motor 2, which generates electricity and converts it into electrical energy. This electrical energy then drives the second motor 3, which in turn drives the second sun gear 12, which in turn drives the second planetary gear set. The rotation of the second planetary carrier 11 drives the output shaft 4. Input-split mode is suitable for vehicle starting and low-speed driving.

[0035] Compound-split mode output: The second clutch C2 engages, starting the engine 1, the first motor 2, and the second motor 3. The output shaft 4 operates in compound-split mode. Engaging the second clutch C2 connects the first ring gear 5 and the second ring gear 9, enabling them to rotate together. The engine 1 drives the first planetary carrier 7, which in turn rotates the first planetary gear set. A portion of the power is transferred from the first sun gear 8 to the second sun gear 12. The rotation of the second sun gear 12 drives the second planetary gear set, which in turn rotates the second planetary carrier 11 and drives the output shaft 4. A portion of the power is transferred from the first ring gear 5 to the second ring gear 9. The rotation of the second ring gear 9 drives the second planetary gear set, which in turn drives the second planetary carrier 11 and drives the output shaft 4. Another portion of the power is transferred from the first ring gear 5 to the first motor 2, which generates electricity and converts it into electrical energy. This electrical energy then drives the second motor 3, which in turn drives the second sun gear 12, which in turn drives the second planetary gear set. The rotation of the second planetary carrier 11 drives the output shaft 4. Compound-split mode is suitable for vehicles traveling at medium and high speeds.

[0036] In addition, the dual-planetary gear dual-mode hybrid transmission device of the present invention can also realize four fixed gear modes by only starting the engine 1 and controlling the working state of the clutch and the brake. The four fixed gear modes are as follows: First Gear Operating Mode: The second brake B2 and the first clutch C1 are engaged to establish a first downshift gear ratio between the input shaft 13 and the output shaft 4. Specifically, engagement of the first clutch C1 connects the input shaft 13 and the first ring gear 5 for rotation. Engagement of the second brake B2 immobilizes the second ring gear 9, preventing it from rotating. The engine 1 drives the first planetary carrier 7 and the first ring gear 5, respectively, to rotate, driving the first planetary gear set. The first sun gear 8 rotates, driving the second sun gear 12. The second planetary gear set rotates, and the second planetary carrier 11 rotates, driving the output shaft 4. This establishes a first downshift gear ratio between the input shaft 13 and the output shaft 4. First gear is a downshift gear.

[0037] Second gear operating mode: The second brake B2 and the second clutch C2 are engaged to establish a second reduction gear ratio between the input shaft 13 and the output shaft 4. Specifically, the engagement of the second clutch C2 connects the first ring gear 5 and the second ring gear 9 for rotation. The engagement of the second brake B2 immobilizes the second ring gear 9, preventing it from rotating. The engine 1 drives the first planetary carrier 7 to rotate, driving the first planetary gear set. The rotation of the first sun gear 8 drives the second sun gear 12, and the second planetary gear set rotates. The second planetary carrier 11 rotates and drives the output shaft 4, establishing a second reduction gear ratio between the input shaft 13 and the output shaft 4. Second gear is a reduction gear.

[0038] Third gear operating mode: The first clutch C1 and the second clutch C2 are engaged to establish a third direct gear ratio between the input shaft 13 and the output shaft 4. Specifically, engagement of the first clutch C1 connects the input shaft 13 and the first ring gear 5 for rotation. Engagement of the second clutch C2 connects the first ring gear 5 and the second ring gear 9 for rotation. The engine 1 drives the first planetary carrier 7 and the first ring gear 5, respectively, to rotate, driving the first planetary gear set. The first sun gear 8 drives the second sun gear 12 for rotation, and the first ring gear 5 drives the second ring gear 9 for rotation, thereby driving the second planetary gear set. The second planetary carrier 11 rotates, driving the output shaft 4, establishing a third direct gear ratio between the input shaft 13 and the output shaft 4. Third gear is a direct gear.

[0039] Fourth gear operating mode: The first brake B1 and the second clutch C2 are engaged to establish a fourth overdrive gear ratio between the input shaft 13 and the output shaft 4. Specifically, the engagement of the first brake B1 immobilizes the first sun gear 8, preventing it from rotating. The engagement of the second clutch C2 couples the first ring gear 5 and the second ring gear 9 to rotate together. The engine 1 drives the first planetary carrier 7 to rotate, driving the first planetary gear set. The rotation of the first ring gear 5 drives the second ring gear 9, which rotates the second planetary gear set. The rotation of the second planetary carrier 11 drives the output shaft 4, establishing a fourth overdrive gear ratio between the input shaft 13 and the output shaft 4. Fourth gear is an overdrive gear.

[0040] It should be noted that, in a dual-planetary gear dual-mode hybrid transmission device of the present invention, the switching control of the pure electric mode, input split mode, and compound split mode only requires the engagement of one torque transfer component (clutch or brake), while the four fixed gear modes only require the engagement of two torque transfer components (clutches or brakes), and only one torque transfer component needs to be replaced when the mode and gear are changed. The control is simple, the mode or gear switching is smooth, the control logic is concise, and a good balance is difficult to achieve in terms of system efficiency and control logic complexity, which facilitates the system to be integrated with the entire vehicle.

[0041] To address reverse gear issues, the dual-planetary gearbox dual-mode hybrid transmission of the present invention can also engage the second brake B2 and activate the second motor 3 to establish reverse gear. Specifically, engagement of the second brake B2 immobilizes the second ring gear 9, preventing it from rotating. The second motor 3 then drives the reverse gear, rotating the second sun gear 12 and the second planetary gearbox. The rotation of the second planet carrier 11 drives the output shaft 4 to achieve reverse gear.

[0042] 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.

[0043] 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-planetary gear dual-mode hybrid power transmission device, characterized in that: 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 and a second 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, and the first sun gear is fixedly connected to the second sun gear; The torque transmission device includes a first clutch, a second clutch, a first brake, and a second brake, wherein the first clutch connects the input shaft and the first ring gear, the second clutch connects the first ring gear and the second ring gear, the first brake connects the first sun gear, and the second brake connects the second ring 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 ring gear is used to connect to the first motor; The second sun gear is used to connect to the second motor; The output shaft is connected to the second planet carrier; The first clutch, the second clutch, the first brake, and the second brake are selectively engaged to adjust a power output mode of the transmission.

2. The dual-planetary gear dual-mode hybrid power transmission device 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 ring gear, and the second motor is connected to the second sun gear.

3. The dual-planetary gear dual-mode hybrid power transmission device according to claim 2, characterized in that: The second brake is engaged, the second motor is started, and the output shaft outputs power in a pure electric mode.

4. The dual-planetary gear dual-mode hybrid power transmission device according to claim 2, characterized in that: The second brake is engaged, the engine, the first electric machine, and the second electric machine are started, and the output shaft outputs in an input-split mode.

5. The dual-planetary gear dual-mode hybrid power transmission device according to claim 2, characterized in that: The second clutch is 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-planetary gear dual-mode hybrid power transmission device according to claim 2, characterized in that: Only the engine is started, and four fixed gear modes are achieved by controlling the working states of the clutch and the brake.

7. The dual-planetary gear dual-mode hybrid power transmission device according to claim 6, characterized in that: The four fixed gear modes are as follows: First gear operating mode: the second brake and the first clutch are engaged to establish a first reduction gear ratio between the input shaft and the output shaft; Second gear operating mode: the second brake and the second clutch are engaged to establish a second reduction gear ratio between the input shaft and the output shaft; Third gear operating mode: the first clutch and the second clutch are engaged to establish a third direct gear transmission ratio between the input shaft and the output shaft; Fourth gear operating mode: the first brake and the second clutch are engaged to establish a fourth overdrive gear ratio between the input shaft and the output shaft.

8. The dual-planetary gear dual-mode hybrid power transmission device according to claim 1, characterized in that: The second brake is engaged, the second electric machine is started, and reverse gear is established.

9. The dual-planetary gear dual-mode hybrid power transmission device according to claim 1, characterized in that: The invention also includes a housing, wherein the planetary gear assembly and the torque transmission device are both arranged in the housing, and the first brake and the second brake are fixedly installed in the housing.

10. The dual-planetary gear dual-mode hybrid power transmission device according to claim 1, characterized in that: The first clutch and the second clutch are multi-plate wet clutches or dog clutches, and the first brake and the second brake are drum brakes or multi-plate wet brakes.

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