Power transmission system and vehicle with same

Abstract

The invention provides a power transmission system and a vehicle with the same. The powertrain includes: an engine; a first motor; a second motor; the planetary gear train comprises a first planet gear and a second planet gear, the output end of the engine is connected with a first planet carrier of the first planet gear, the output end of the first motor is connected with a first sun gear of the first planet gear, and the second motor is connected with a second gear ring of the second planet gear; a first gear ring of the first planet gear is connected with a second sun gear of the second planet gear through a clutch; the input end of the output shaft is connected with at least one of the first gear ring and the second planet carrier of the second planet wheel, and the output end of the output shaft is used for outputting power; the locking assembly comprises a plurality of locking devices, the planetary gear train is provided with a plurality of locking points, and the locking devices are connected with the locking points in a one-to-one correspondence mode. The problems that a hybrid transmission system is single in mode and single in gear are solved.

Description

Technical Field

[0001] This invention relates to the field of power transmission technology, and more specifically, to a power transmission system and a vehicle having the same. Background Technology

[0002] With the increasing awareness of energy conservation and emission reduction, conventional vehicles are limited by their structure and cannot meet people's needs. Hybrid vehicles, as a new type of vehicle power, are in a stage of vigorous development in terms of technology and market, and the drive system of hybrid vehicles occupies an extremely important position.

[0003] Current hybrid transmissions are limited by their structure, are simple in design, and rely on the electric motor to regulate vehicle speed and load capacity, which places high demands on the motor's performance. They also have a single hybrid mode, a single gear ratio, and a low overall fuel efficiency.

[0004] There is currently no effective solution to the aforementioned technical problems. Summary of the Invention

[0005] The main objective of this invention is to provide a power transmission system and a vehicle having the same, so as to solve the problems of single mode and single gear in the existing hybrid transmission system.

[0006] To achieve the above objectives, according to one aspect of the present invention, a power transmission system is provided, comprising: an engine; a first motor; a second motor; a planetary gear train, the planetary gear train including a first planetary gear and a second planetary gear, the output end of the engine being connected to a first planetary carrier of the first planetary gear, the output end of the first motor being connected to a first sun gear of the first planetary gear, the second motor being connected to a second ring gear of the second planetary gear, the first ring gear of the first planetary gear being connected to the second sun gear of the second planetary gear via a clutch; an output shaft, the input end of the output shaft being connected to at least one of the first ring gear and the second planetary carrier of the second planetary gear, the output end of the output shaft being used to output power; a locking assembly, the locking assembly including a plurality of locking devices, the planetary gear train having a plurality of locking points, the plurality of locking devices being connected one-to-one with the plurality of locking points, the locking devices having a locked state of contacting the transmission housing to lock the planetary gear train, and an unlocked state of being separated from the transmission housing; wherein the engine, the first motor, the second motor, and the planetary gear train are all coaxially arranged.

[0007] Further, the locking device includes: a first locking member, one end of which is connected to the first planetary carrier, the other end of which has a first locked state in contact with the transmission housing, and a first unlocked state separated from the transmission housing; a second locking member, one end of which is connected to the first sun gear, the other end of which has a second locked state in contact with the transmission housing, and a second unlocked state separated from the transmission housing; and a third locking member, one end of which is connected to the first ring gear, the other end of which has a third locked state in contact with the transmission housing, and a third unlocked state separated from the transmission housing. The system has three unlocked states; a fourth locking member, one end of which is connected to the second sun gear, and the other end of which has a fourth locked state in contact with the transmission housing, and a fourth unlocked state separated from the transmission housing; a fifth locking member, one end of which is connected to the second ring gear, and the other end of which has a fifth locked state in contact with the transmission housing, and a fifth unlocked state separated from the transmission housing; and a sixth locking member, one end of which is connected to the second planetary carrier, and the other end of which has a sixth locked state in contact with the transmission housing, and a sixth unlocked state separated from the transmission housing.

[0008] Furthermore, the power transmission system also includes a transmission gear assembly, which includes: a first driving gear connected to a first gear ring; a first driven gear meshing with the first driving gear and connected to the output shaft via a first synchronizer; a second driving gear connected to a second planetary carrier; and a second driven gear meshing with the second driving gear and connected to the output shaft via a second synchronizer.

[0009] Furthermore, the powertrain system has a pure electric drive mode, which includes low-range, medium-range, and high-range pure electric drive. When the powertrain system is in high-range pure electric drive, the fourth locking element is in the fourth locked state, the second synchronizer connects the output shaft to the second driven gear, and the second motor is in operation. When the powertrain system is in medium-range pure electric drive, the first locking element is in the first locked state, the first synchronizer connects the output shaft to the first driven gear, and the first motor is in operation. When the powertrain system is in low-range pure electric drive, the first locking element is in the first locked state, the fifth locking element is in the fifth locked state, the clutch connects the first gear ring to the second sun gear, the second synchronizer connects the output shaft to the second driven gear, and the first motor is in operation.

[0010] Furthermore, the powertrain system has an engine direct drive mode, which includes an engine direct drive low-gear mode and an engine direct drive high-gear mode. When the powertrain system is in engine direct drive high-gear mode, the second locking element is in a second locked state, the first synchronizer connects the output shaft to the first driven gear, and the engine is in a working state. When the powertrain system is in engine direct drive low-gear mode, the second locking element is in a second locked state, the fifth locking element is in a fifth locked state, the clutch connects the first gear ring to the second sun gear, the second synchronizer connects the output shaft to the second driven gear, and the engine is in a working state.

[0011] Furthermore, the power transmission system has a power split mode. When the power transmission system is in the power split mode, the second locking element is in the second locking state, the sixth locking element is in the sixth locking state, the clutch connects the first gear ring to the second sun gear, the first synchronizer connects the output shaft to the first driven gear, and the engine is in the working state.

[0012] Furthermore, the power transmission system has a dual-motor mode. When the power transmission system is in dual-motor mode, the first locking element is in the first locking state, the fourth locking element is in the fourth locking state, the output shaft is connected to the first driven gear through the first synchronizer, and the output shaft is connected to the second driven gear through the second synchronizer. Both the first motor and the second motor are in working state.

[0013] Furthermore, the powertrain system has a series range-extending mode. When the powertrain system is in the series range-extending mode, the third locking element is in the third locking state, the fourth locking element is in the fourth locking state, the second synchronizer connects the output shaft to the second driven gear, and both the engine and the second motor are in the working state.

[0014] Furthermore, the power transmission system has a parallel mode. When the power transmission system is in parallel mode, the second locking element is in the second locking state, the fourth locking element is in the fourth locking state, the output shaft is connected to the first driven gear through the first synchronizer, and the output shaft is connected to the second driven gear through the second synchronizer. Both the engine and the second motor are in working state.

[0015] According to another aspect of the present invention, a vehicle is provided, the vehicle having a power transmission system, the power transmission system being the aforementioned power transmission system.

[0016] By employing the technical solution of this invention, a dual planetary gear set and dual motor arrangement are adopted. Combined with a locking assembly, the locking device of the locking assembly is connected one-to-one with multiple locking points on the planetary gear train of the dual planetary gear set. This allows for the rigid fixing of each component of the planetary gear train as needed, eliminating power loss and achieving a fixed speed ratio under all operating conditions, thus improving transmission efficiency. Furthermore, by locking different positions of the planetary gear train with the locking device, combined with precise clutch engagement and disengagement control, multiple operating modes of the power transmission system can be achieved. That is, by locking and disengaging each component of the planetary gear train, the torque transmission path of the engine, the first motor, and the second motor as power sources on the planetary gear train is changed, enabling transmission modes corresponding to different vehicle operating conditions, providing diverse gear ratios and hybrid modes. Simultaneously, by coaxializing the engine, the first motor, the second motor, and the planetary gear train, high coupling between the motor and the shaft is achieved, reducing axial dimensions and freeing up more space for the entire vehicle. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of an embodiment of the power transmission system according to the present invention is shown;

[0019] Figure 2 A schematic diagram of the torque transmission path of a first embodiment of the powertrain system according to the present invention in pure electric drive mode is shown.

[0020] Figure 3 A schematic diagram of the torque transmission path according to a second embodiment of the powertrain system of the present invention in pure electric drive mode is shown;

[0021] Figure 4 A schematic diagram of the torque transmission path of a third embodiment of the powertrain system according to the present invention in pure electric drive mode is shown;

[0022] Figure 5 A schematic diagram of the torque transmission path of a powertrain system according to the present invention in engine direct drive mode is shown.

[0023] Figure 6 A schematic diagram of the torque transmission path of a powertrain system according to the present invention in engine direct drive mode is shown.

[0024] Figure 7 A schematic diagram of the torque transmission path in an embodiment of the power transmission system according to the present invention in power split mode is shown;

[0025] Figure 8A schematic diagram of the torque transmission path in an embodiment of the power transmission system according to the present invention in dual-motor mode is shown;

[0026] Figure 9 A schematic diagram of the torque transmission path is shown in an embodiment of the power transmission system according to the present invention in series range-extending mode;

[0027] Figure 10 A schematic diagram of the torque transmission path is shown in an embodiment of the power transmission system according to the present invention in parallel mode;

[0028] Figure 11 A schematic diagram of the torque transmission path is shown in an embodiment of the power transmission system according to the present invention in the parking power generation mode.

[0029] The above figures include the following reference numerals:

[0030] 10. Engine;

[0031] 20. First motor;

[0032] 30. Second motor;

[0033] 40. First planetary gear; 41. First planet carrier; 42. First sun gear; 43. First gear ring;

[0034] 50. Second planetary gear; 51. Second planetary carrier; 52. Second sun gear; 53. Second gear ring;

[0035] 60. Clutch;

[0036] 70. Output shaft; 71. First synchronizer; 72. Second synchronizer;

[0037] 80. Locking assembly; 81. First locking element; 82. Second locking element; 83. Third locking element; 84. Fourth locking element; 85. Fifth locking element; 86. Sixth locking element;

[0038] 90. Transmission gear assembly; 91. First driving gear; 92. First driven gear; 93. Second driving gear; 94. Second driven gear. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0043] Combination Figure 1 As shown, according to a specific embodiment of this application, a power transmission system is provided.

[0044] Specifically, such as Figure 1As shown, the power transmission system includes an engine 10, a first motor 20, a second motor 30, a planetary gear train, an output shaft 70, and a locking assembly 80. The planetary gear train includes a first planetary gear 40 and a second planetary gear 50. The output end of the engine 10 is connected to the first planet carrier 41 of the first planetary gear 40, the output end of the first motor 20 is connected to the first sun gear 42 of the first planetary gear 40, and the second motor 30 is connected to the second ring gear 53 of the second planetary gear 50. The first ring gear 43 of the first planetary gear 40 is connected to the second sun gear 52 of the second planetary gear 50 via a clutch 60. The output shaft 70 is connected to at least one of the first gear ring 43 and the second planetary carrier 51 of the second planetary gear 50. The output end of the output shaft 70 is used to output power. The locking assembly 80 includes multiple locking devices. The planetary gear train has multiple locking points. The multiple locking devices are connected to the multiple locking points one by one. The locking devices have a locked state that contacts the transmission housing to lock the planetary gear train, and an unlocked state that separates the locking devices from the transmission housing. The engine 10, the first motor 20, the second motor 30, and the planetary gear train are all arranged coaxially.

[0045] The technical solution of this embodiment employs a dual planetary gear set and a dual-motor arrangement. Combined with the locking assembly 80, the locking device of the locking assembly 80 is connected one-to-one with multiple locking points on the planetary gear train of the dual planetary gear set. This allows for the rigid fixing of each component of the planetary gear train as needed, eliminating power loss and achieving a fixed speed ratio under all operating conditions, thus improving transmission efficiency. Furthermore, by locking different positions of the planetary gear train with the locking device, combined with precise clutch control of the clutch 60, multiple operating modes of the power transmission system can be achieved. That is, by locking and disengaging each component of the planetary gear train with the locking device, the torque transmission path of the engine 10, the first motor 20, and the second motor 30 as power sources on the planetary gear train can be changed, enabling transmission modes corresponding to different vehicle operating conditions, providing diverse gear ratios and hybrid modes. Simultaneously, by coaxializing the engine 10, the first motor 20, the second motor 30, and the planetary gear train, high coupling between the motor and the shaft is achieved, reducing axial dimensions and allowing for more space in the vehicle.

[0046] In one embodiment of this application, the engine 10, the first motor 20, the second motor 30, and the planetary gear system are all coaxial. The first motor 20 is mounted on the output shaft of the engine 10, and the second motor 30 is mounted on the output end of the second planetary carrier 51 to minimize the circumferential dimensions of the power transmission system. The output shaft 70 is arranged parallel to the output shaft of the engine 10 and the motor rotor shaft, so that the vehicle can make full use of the lateral space of the vehicle. At the same time, arranging the output shaft 70 parallel to one side of the output shaft of the engine 10 and the motor rotor shaft can facilitate the provision of multiple gear outputs and enhance the adaptability of the vehicle under different working conditions.

[0047] Specifically, the locking device includes a first locking member 81, a second locking member 82, a third locking member 83, a fourth locking member 84, a fifth locking member 85, and a sixth locking member 86. One end of the first locking member 81 is connected to the first planetary carrier 41, and the other end of the first locking member 81 has a first locked state in contact with the transmission housing and a first unlocked state separated from the transmission housing. One end of the second locking member 82 is connected to the first sun gear 42, and the other end of the second locking member 82 has a second locked state in contact with the transmission housing and a second unlocked state separated from the transmission housing. One end of the third locking member 83 is connected to the first gear ring 43, and the other end of the third locking member 83 has a locking state in contact with the transmission housing. The third locking state, and the third unlocking state having a separation from the transmission housing; one end of the fourth locking member 84 is connected to the second sun gear 52, the other end of the fourth locking member 84 has a fourth locking state in contact with the transmission housing, and a fourth unlocking state having a separation from the transmission housing; one end of the fifth locking member 85 is connected to the second ring gear 53, the other end of the fifth locking member 85 has a fifth locking state in contact with the transmission housing, and a fifth unlocking state having a separation from the transmission housing; one end of the sixth locking member 86 is connected to the second planetary carrier 51, the other end of the sixth locking member 86 has a sixth locking state in contact with the transmission housing, and a sixth unlocking state having a separation from the transmission housing.

[0048] In this embodiment, the locking device includes six independent locking elements, which are respectively connected to the first sun gear 42, the first planetary carrier 41, the first ring gear 43, the second sun gear 52, the second ring gear 53, and the second planetary carrier 51. Each locking element has one end connected to a corresponding locking point, and the other end has two states. In the locked state, the locking element forms rigid contact with the transmission housing, preventing the movement of the corresponding components of the planetary gear train; in the unlocked state, the locking element is separated from the transmission housing, allowing the planetary gear train to move freely. By controlling the switching between the locked and unlocked states of the corresponding planetary gear train components by the locking elements, precise control of the internal movement of the powertrain system is achieved, thereby flexibly switching between various operating modes to adapt to different driving needs and optimize energy utilization efficiency. This simplifies the structure of the powertrain system, improves space utilization, and significantly enhances the economy and power performance of hybrid vehicles by reducing losses during energy conversion.

[0049] Furthermore, the power transmission system also includes a transmission gear assembly 90, which includes a first driving gear 91, a first driven gear 92, a second driving gear 93, and a second driven gear 94. The first driving gear 91 is connected to the first ring gear 43; the first driven gear 92 meshes with the first driving gear 91 and is connected to the output shaft 70 via a first synchronizer 71; the second driving gear 93 is connected to the second planetary carrier 51; and the second driven gear 94 meshes with the second driving gear 93 and is connected to the output shaft 70 via a second synchronizer 72. The first driving gear 91, by meshing with the first driven gear 92 and then through the first synchronizer 71, can transmit power from the first ring gear 43 to the output shaft 70. Similarly, the second driving gear 93, by meshing with the second driven gear 94 and then through the second synchronizer 72, can transmit power from the second planetary carrier 51 to the output shaft 70. In other words, the power from the first planetary gear 40 and the second planetary gear 50 can be transmitted according to the needs of different operating conditions through two gear transmission pairs. At the same time, the coordinated operation of gear transmission pairs and synchronizers can ensure smooth power transmission, reduce internal shocks and wear in the power system, and improve the stability and reliability of the transmission system.

[0050] It should be noted that the first synchronizer 71 has an engaged state that connects the output shaft 70 to the first driven gear 92, and a disengaged state that disconnects the output shaft 70 from the first driven gear 92; the second synchronizer 72 has an engaged state that connects the output shaft 70 to the second driven gear 94, and a disengaged state that disconnects the output shaft 70 from the second driven gear 94. By switching the respective states of the first synchronizer 71 and the second synchronizer 72, the stability of switching between various operating modes can be ensured.

[0051] Optionally, both the first synchronizer 71 and the second synchronizer 72 can be replaced by a clutch, and the clutch 60 can also be replaced by a synchronizer.

[0052] Furthermore, such as Figures 2 to 4As shown, the powertrain system has a pure electric drive mode, which includes low-range, medium-range, and high-range pure electric drive. When the powertrain system is in high-range pure electric drive, the fourth locking element 84 is in the fourth locked state, the second synchronizer 72 connects the output shaft 70 to the second driven gear 94, and the second motor 30 is in operation. When the powertrain system is in medium-range pure electric drive, the first locking element 81 is in the first locked state, the first synchronizer 71 connects the output shaft 70 to the first driven gear 92, and the first motor 20 is in operation. When the powertrain system is in low-range pure electric drive, the first locking element 81 is in the first locked state, the fifth locking element 85 is in the fifth locked state, the clutch 60 connects the first gear ring 43 to the second sun gear 52, the second synchronizer 72 connects the output shaft 70 to the second driven gear 94, and the first motor 20 is in operation.

[0053] In this embodiment, as Figure 2 As shown, Figure 2 This diagram illustrates the torque transmission path of the powertrain system in pure electric drive high-end mode. In this mode, the fourth locking element 84 is in the fourth locked state, fixing the second sun gear 52 and preventing it from participating in power transmission. The second synchronizer 72 is engaged, connecting the output shaft 70 to the second driven gear 94. The second driven gear 94 and the second driving gear 93 can transmit power from the second planetary carrier 51 to the output shaft 70. The second motor 30 is operational, driving the second ring gear 53. Power can be transmitted through the ring gear 53 to the second planetary carrier 51, thereby rotating the second driving gear 93. It should be noted that in this mode, driven by the second motor 30, the engine 10 and the first motor 20 are not operating. Two-stage reduction is achieved in the process of power transmission from the second ring gear 53 to the output shaft 70, making it suitable for high-end operating conditions.

[0054] In this embodiment, as Figure 3 As shown, Figure 3 This is a schematic diagram of the torque transmission path when the power transmission system is in the pure electric drive mid-range mode. In this mode, the first locking member 81 is in the first locking state, fixing the first planetary carrier 41; the first synchronizer 71 is in the engaged state, connecting the output shaft 70 with the first driven gear 92. The first driven gear 92 and the first driving gear 91 can transmit the power on the first gear ring 43 to the output shaft 70; the first motor is in the working state, driving the first sun gear 42 to move. The power can be transmitted through the first sun gear 42 to the first gear ring 43, thereby driving the first driving gear 91 to rotate.

[0055] In this embodiment, as Figure 4 As shown, Figure 4This is a schematic diagram of the torque transmission path when the power transmission system is in the low-gear pure electric drive mode. In this mode, the first locking member 81 is in the first locking state, and the fifth locking member 85 is in the fifth locking state, so that the first planetary carrier 41 and the second ring gear 53 are fixed. The clutch 60 and the second synchronizer 72 are engaged, so that the first ring gear 43 is connected to the second sun gear 52, and the power is transmitted on the two planetary gears. The first motor 20 is in the working state, driving the first sun gear 42 to rotate. The power is finally transmitted to the output shaft through the first sun gear 42, the first ring gear 43, the second sun gear 52, and the second planetary carrier 51.

[0056] With the powertrain system in pure electric drive mode, which has three pure electric gears (high, low, and medium), it breaks through the single-speed limitation by achieving multiple gears and can cover the entire vehicle speed range, improving the efficiency and performance of the motor at different speeds.

[0057] Furthermore, such as Figure 5 , Figure 6 As shown, the powertrain system has an engine direct drive mode, which includes an engine direct drive low gear mode and an engine direct drive high gear mode. When the powertrain system is in engine direct drive high gear, the second locking member 82 is in the second locking state, the first synchronizer 71 connects the output shaft 70 to the first driven gear 92, and the engine 10 is in the working state. When the powertrain system is in engine direct drive low gear, the second locking member 82 is in the second locking state, the fifth locking member 85 is in the fifth locking state, the clutch 60 connects the first gear ring 43 to the second sun gear 52, the second synchronizer 72 connects the output shaft 70 to the second driven gear 94, and the engine 10 is in the working state.

[0058] In this embodiment, as Figure 5 As shown, Figure 5 This is a schematic diagram of the torque transmission path when the power transmission system is in the high-speed direct-drive mode of the engine. In this mode, the second locking member 82 is in the second locking state, so that the first sun gear 42 is fixed; the first synchronizer 71 is in the engaged state, connecting the output shaft 70 with the first driven gear 92. The first driven gear 92 and the first driving gear 91 can transmit the power on the first gear ring 43 to the output shaft 70; the engine 10 is in the working state, and the power output by the engine 10 is directly transmitted to the output shaft 70 through the first planetary carrier 41, the first gear ring 43, the first driving gear 91, and the first driven gear 92, realizing direct-drive of the engine.

[0059] In this embodiment, as Figure 6 As shown, Figure 6This diagram illustrates the torque transmission path of the power transmission system in the engine direct drive low-gear mode. In this mode, the second locking element 82 is in the second locking state, and the fifth locking element 85 is in the fifth locking state, fixing the first sun gear 42 and the second ring gear 53. The clutch 60 and the second synchronizer 72 are engaged, connecting the first ring gear 43 and the second sun gear 52, allowing power to be transmitted through the two planetary gears. The engine 10 is in operation, and the power output by the engine 10 is directly transmitted to the output shaft through the first planetary carrier 41, the first ring gear 43, the second sun gear 52, the second planetary carrier 51, the second driving gear 93, and the second driven gear 94, achieving low-speed engine drive.

[0060] Furthermore, such as Figure 7 As shown, the power transmission system has a power split mode. When the power transmission system is in the power split mode, the second locking member 82 is in the second locking state, the sixth locking member 86 is in the sixth locking state, the clutch 60 connects the first ring gear 43 to the second sun gear 52, the first synchronizer 71 connects the output shaft 70 to the first driven gear 92, and the engine 10 is in the working state. In this mode, the second locking member 82 is in the second locking state, and the sixth locking member 86 is in the sixth locking state, so that the first sun gear 42 and the second planetary carrier 51 are fixed; the clutch 60 and the first synchronizer 71 are engaged, so that the first ring gear 43 is connected to the second sun gear 52, and the power is transmitted on the two planetary gears; the engine 10 is in the working state, and the power output by the engine 10 is directly transmitted to the output shaft 70 through the first planetary carrier 41, the first ring gear 43, the first driving gear 91, and the first driven gear 92. Meanwhile, the power output by the engine 10 can also be transmitted to the second sun gear 52 through the first ring gear 43. Since the second planetary carrier 51 is fixed, the power on the second sun gear 52 is transmitted to the second motor 30 through the second ring gear 53, so that the second motor 30 can operate as a generator and generate electrical energy to charge the vehicle's power battery or assist the first motor 20.

[0061] It should be noted that in this mode, the engine 10 not only drives the vehicle directly through a mechanical path, but also generates electricity or supplements torque through an electric motor via an electronic control path, realizing dual utilization of power and greatly improving the overall energy efficiency of the system. The power split mode optimizes the responsiveness and economy of the power system by precisely controlling the power distribution.

[0062] Furthermore, such as Figure 8As shown, the power transmission system has a dual-motor mode. When the power transmission system is in dual-motor mode, the first locking member 81 is in the first locking state, the fourth locking member 84 is in the fourth locking state, the output shaft 70 is connected to the first driven gear 92 through the first synchronizer 71, and the output shaft 70 is connected to the second driven gear 94 through the second synchronizer 72. Both the first motor 20 and the second motor 30 are in working state. In this mode, the first locking element 81 is in the first locking state, and the fourth locking element 84 is in the fourth locking state, fixing the first planetary carrier 41 and the second sun gear 52 in place. Both the first synchronizer 71 and the second synchronizer 72 are engaged, connecting the output shaft 70 to the first driven gear 92 and the second driven gear 94. Both the first motor 20 and the second motor 30 are operational. The power generated by the first motor 20 travels through the first sun gear 42, the first ring gear 43, the first driving gear 91, and the first driven gear 92 to the output shaft 70, while the power generated by the second motor 30 travels through the second ring gear 53, the second planetary carrier 51, the second driving gear 93, and the second driven gear 94 to the output shaft 70. With this configuration, both the first motor 20 and the second motor 30 are operational, jointly providing power to the vehicle. Due to the combined effect of the two motors' power, the vehicle achieves higher torque output and stronger acceleration performance.

[0063] Furthermore, such as Figure 9 As shown, the power transmission system has a series range-extending mode. When the power transmission system is in the series range-extending mode, the third locking element 83 is in the third locking state, the fourth locking element 84 is in the fourth locking state, the second synchronizer 72 connects the output shaft 70 to the second driven gear 94, and both the engine 10 and the second motor 30 are in the working state. In this mode, the third locking member 83 is in the third locking state, and the fourth locking member 84 is in the fourth locking state, so that the first gear ring 43 and the second sun gear 52 are fixed. The second synchronizer 72 is in the engaged state, connecting the output shaft 70 with the second driven gear 94. The second driven gear 94 and the second driving gear 93 can transmit the power on the second planetary carrier 51 to the output shaft 70. The engine 10 and the second motor 30 are both in the working state. The engine 10 is mainly used for power generation. Its power is transmitted to the first motor 20 through the fixed first planetary carrier 41 and the first sun gear 42. At this time, the first motor 20 operates as a generator, converting the mechanical energy of the engine into electrical energy to charge the battery or directly supply the second motor 30. The second motor 30 is responsible for driving. By driving the second gear ring 53, its power is transmitted to the output shaft 70 through the second driven gear 94 and the second synchronizer 72, ultimately driving the vehicle.

[0064] In this embodiment, the series range extender mode is suitable for scenarios that maximize electric driving range. When the battery charge is low, the engine 10 can generate electricity to extend the electric driving range without sacrificing power performance. The operating state of the engine 10 is automatically adjusted according to the remaining battery charge and driving demand to ensure the continuity and sufficiency of power. Moreover, the engine 10 is only used for power generation and does not directly participate in power output, so it can operate in a more efficient range and reduce harmful emissions. At the same time, the direct drive of the second motor 30 further reduces the overall emission level.

[0065] Furthermore, such as Figure 10 As shown, the power transmission system has a parallel mode. When the power transmission system is in parallel mode, the second locking member 82 is in the second locking state, the fourth locking member 84 is in the fourth locking state, the output shaft 70 is connected to the first driven gear 92 through the first synchronizer 71, and the output shaft 70 is connected to the second driven gear 94 through the second synchronizer 72. Both the engine 10 and the second motor 30 are in working state. In this mode, the second locking member 82 is in the second locking state, and the fourth locking member 84 is in the fourth locking state, so that the first sun gear 42 and the second sun gear 52 are fixed in place; the first synchronizer 71 and the second synchronizer 72 are both engaged, so that the output shaft 70 is connected to the first driven gear 92 and the second driven gear 94; the engine 10 and the second motor 30 are both in operation. The engine 10 and the second motor 30 work independently but are ultimately connected in parallel for output. The power of the engine 10 is transmitted to the first driven gear 92 through the first planetary carrier 41, and then to the output shaft 70 through the first synchronizer 71; while the power of the second motor 30 is transmitted to the second driven gear 94 through the second gear ring 53, and finally to the same output shaft 70 through the second synchronizer 72.

[0066] In this embodiment, the parallel mode is suitable for situations requiring instantaneous high torque and high power, such as vehicle start-up, acceleration, or uphill operation. The engine 10 and the second motor 30 can provide power simultaneously, achieving power superposition, which significantly improves the vehicle's acceleration performance and load capacity. Moreover, the engine 10 and the second motor 30 each operate in their own efficient operating range, which can achieve optimal energy utilization and improve the overall efficiency of the entire power system.

[0067] In one exemplary embodiment of this application, such as Figure 11 As shown, the powertrain system also has a parking power generation mode. In this mode, the third locking member 83 is in the third locking state, so that the first gear ring 43 is fixed and the engine 10 is in the power generation working state, driving the first motor 20 to rotate. The first motor 20 can be used to charge the battery or provide power to the vehicle.

[0068] According to another specific embodiment of this application, a vehicle is also provided, which has a powertrain system, the powertrain system described in the above embodiments. Applying the powertrain system described in the above embodiments to a vehicle allows the vehicle to flexibly switch between pure electric drive, series range extender, parallel drive, and engine direct drive modes to meet the needs of different driving scenarios. At the same time, the coaxial coupling layout significantly reduces the axial space occupied by the powertrain system, providing more design freedom for other components of the vehicle.

[0069] As can be seen from the above description, the power transmission system in the above embodiments has the following beneficial effects:

[0070] 1) The speed ratio is fixed under all working conditions. The planetary gear system and other components are rigidly fixed by the locking device to eliminate power loss and improve transmission efficiency.

[0071] 2) The engine 10 has two gears, high and low speed, which better suits the actual use environment of users and improves the problem of low efficiency of motor in the high-speed range.

[0072] 3) The motor is highly coupled with the shaft, reducing the axial dimension and leaving more space for the whole vehicle.

[0073] 4) The locking device and clutch are precisely controlled, enabling up to ten working modes (pure electric drive high speed, pure electric drive medium speed, pure electric drive low speed, engine direct drive low speed, engine direct drive high speed, parking charging, power splitting, dual motors, series range extender, and parallel mode).

[0074] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0075] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0076] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A power transmission system, characterized in that, include: Engine (10); First motor (20); Second motor (30); The planetary gear system includes a first planetary gear (40) and a second planetary gear (50). The output end of the engine (10) is connected to the first planet carrier (41) of the first planetary gear (40). The output end of the first motor (20) is connected to the first sun gear (42) of the first planetary gear (40). The second motor (30) is connected to the second ring gear (53) of the second planetary gear (50). The first ring gear (43) of the first planetary gear (40) is connected to the second sun gear (52) of the second planetary gear (50) through a clutch (60). An output shaft (70) has its input end connected to at least one of the first gear ring (43) and the second planet carrier (51) of the second planetary gear (50), and its output end is used to output power. Locking assembly (80) includes a plurality of locking devices, the planetary gear train has a plurality of locking points, the plurality of locking devices are connected one-to-one with the plurality of locking points, the locking devices have a locked state that contacts the transmission housing to lock the planetary gear train, and the locking devices have an unlocked state that is separated from the transmission housing. The engine (10), the first motor (20), the second motor (30), and the planetary gear system are all arranged coaxially.

2. The power transmission system according to claim 1, characterized in that, The locking device includes: A first locking member (81) has one end connected to the first planetary carrier (41), and the other end of the first locking member (81) has a first locking state in contact with the transmission housing, and a first unlocking state separated from the transmission housing. The second locking member (82) has one end connected to the first sun gear (42), and the other end of the second locking member (82) has a second locking state in contact with the transmission housing, and a second unlocking state separated from the transmission housing; The third locking member (83) has one end connected to the first gear ring (43), and the other end of the third locking member (83) has a third locking state in contact with the transmission housing, and a third unlocking state separated from the transmission housing. The fourth locking member (84) has one end connected to the second sun gear (52), and the other end of the fourth locking member (84) has a fourth locking state in contact with the transmission housing, and a fourth unlocking state separated from the transmission housing; The fifth locking member (85) has one end connected to the second gear ring (53), and the other end of the fifth locking member (85) has a fifth locking state in contact with the transmission housing, and a fifth unlocking state separated from the transmission housing; The sixth locking member (86) has one end connected to the second planetary carrier (51), and the other end of the sixth locking member (86) has a sixth locking state in contact with the transmission housing, and a sixth unlocking state separated from the transmission housing.

3. The power transmission system according to claim 2, characterized in that, The power transmission system further includes a transmission gear assembly (90), which includes: The first driving gear (91) is connected to the first gear ring (43); The first driven gear (92) meshes with the first driving gear (91), and the first driven gear (92) is connected to the output shaft (70) through the first synchronizer (71); The second driving gear (93) is connected to the second planetary carrier (51); The second driven gear (94) meshes with the second driving gear (93) and is connected to the output shaft (70) via the second synchronizer (72).

4. The power transmission system according to claim 3, characterized in that, The powertrain system has a pure electric drive mode, which includes low-range, mid-range, and high-range pure electric drive. When the power transmission system is in the high-end of pure electric drive, the fourth locking member (84) is in the fourth locking state, the second synchronizer (72) connects the output shaft (70) to the second driven gear (94), and the second motor (30) is in the working state; When the power transmission system is in the pure electric drive mid-range, the first locking member (81) is in the first locking state, the first synchronizer (71) connects the output shaft (70) to the first driven gear (92), and the first motor (20) is in the working state. When the power transmission system is in the low gear of pure electric drive, the first locking member (81) is in the first locking state, the fifth locking member (85) is in the fifth locking state, the clutch (60) connects the first gear ring (43) to the second sun gear (52), the second synchronizer (72) connects the output shaft (70) to the second driven gear (94), and the first motor (20) is in the working state.

5. The power transmission system according to claim 3, characterized in that, The powertrain system has an engine direct drive mode, which includes an engine direct drive low-gear mode and an engine direct drive high-gear mode. When the power transmission system is in the high gear of the direct drive of the engine, the second locking member (82) is in the second locking state, the first synchronizer (71) connects the output shaft (70) to the first driven gear (92), and the engine (10) is in the working state; When the power transmission system is in the engine direct drive low gear, the second locking member (82) is in the second locking state, the fifth locking member (85) is in the fifth locking state, the clutch (60) connects the first gear ring (43) to the second sun gear (52), the second synchronizer (72) connects the output shaft (70) to the second driven gear (94), and the engine (10) is in the working state.

6. The power transmission system according to claim 3, characterized in that, The power transmission system has a power split mode. When the power transmission system is in the power split mode, the second locking member (82) is in the second locking state, the sixth locking member (86) is in the sixth locking state, the clutch (60) connects the first gear ring (43) to the second sun gear (52), the first synchronizer (71) connects the output shaft (70) to the first driven gear (92), and the engine (10) is in the working state.

7. The power transmission system according to claim 3, characterized in that, The power transmission system has a dual-motor mode. When the power transmission system is in the dual-motor mode, the first locking member (81) is in the first locking state, the fourth locking member (84) is in the fourth locking state, the output shaft (70) is connected to the first driven gear (92) through the first synchronizer (71), and the output shaft (70) is connected to the second driven gear (94) through the second synchronizer (72). Both the first motor (20) and the second motor (30) are in working state.

8. The power transmission system according to claim 3, characterized in that, The power transmission system has a series range-extending mode. When the power transmission system is in the series range-extending mode, the third locking member (83) is in the third locking state, the fourth locking member (84) is in the fourth locking state, the second synchronizer (72) connects the output shaft (70) to the second driven gear (94), and the engine (10) and the second motor (30) are both in working state.

9. The power transmission system according to claim 3, characterized in that, The power transmission system has a parallel mode. When the power transmission system is in the parallel mode, the second locking member (82) is in the second locking state, the fourth locking member (84) is in the fourth locking state, the output shaft (70) is connected to the first driven gear (92) through the first synchronizer (71), and the output shaft (70) is connected to the second driven gear (94) through the second synchronizer (72). The engine (10) and the second motor (30) are both in working state.

10. A vehicle, characterized in that, The vehicle has a power transmission system, which is the power transmission system according to any one of claims 1-9.

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