Hybrid powertrain system and vehicle

Abstract

The present disclosure provides a hybrid transmission system and vehicle, belonging to the field of vehicle technology. The hybrid transmission system includes an engine, a planetary gear train, a dual-rotor motor, a reduction mechanism, and an output shaft. The planetary gear train includes a planetary carrier, a sun gear, planetary gears, and a ring gear. The ring gear surrounds the sun gear, and the planetary gears are located between the ring gear and the sun gear. The input end of the planetary carrier is connected to the engine, and the output end is connected to the planetary gears. The dual-rotor motor includes an inner rotor, an outer rotor, a stator, and a battery pack. The stator has a first coil and a second coil. The battery pack drives the outer rotor through the first coil, and the inner rotor charges the battery pack through the second coil. The inner rotor is coaxially connected to the sun gear, and the outer rotor is connected to the input end of the ring gear. The ring gear, reduction mechanism, and output shaft are sequentially connected in a transmission connection, and the output shaft drives the wheels. The compact size of the dual-rotor motor reduces the size of the hybrid transmission system, facilitating its placement in the vehicle.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicles, and particularly to a hybrid transmission system and a vehicle. Background Art

[0002] The hybrid transmission system is an important component in hybrid vehicles, which uses an engine and an electric motor as power sources, enabling the vehicle to achieve an oil-electric drive mode, thus combining power performance and economy.

[0003] In related technologies, the power sources of the hybrid transmission system include one engine and two electric motors, and different drive modes are switched by switching different power sources.

[0004] However, most of the hybrid transmission systems in related technologies are developed based on traditional automatic transmissions, and the electric motors are simply integrated at the front end or the rear end of transmissions such as AT (Automatic Transmission), AMT (Automated Mechanical Transmission), CVT (Continuously Variable Transmission), or DCT (Dual Clutch Transmission). Although this type of hybrid system has a lower technical difficulty and less R & D investment, its structure is relatively complex and occupies a large volume, resulting in difficulties in arranging the hybrid transmission system in the vehicle. Summary of the Invention

[0005] The present disclosure provides a hybrid transmission system and a vehicle, which can solve the technical problems existing in related technologies. The technical solutions of the hybrid transmission system and the vehicle are as follows.

[0006] In a first aspect, the present disclosure provides a hybrid transmission system, which includes an engine, a planetary gear train, a dual-rotor electric motor, a reduction mechanism, and an output shaft;

[0007] The planetary gear train includes a planet carrier, a sun gear, planet gears, and a ring gear. The ring gear surrounds the sun gear, the planet gears are located between the ring gear and the sun gear, the input end of the planet carrier is connected to the engine, and the output end is connected to the planet gears;

[0008] The dual-rotor motor includes an inner rotor, an outer rotor, a stator, and a battery pack. The stator is enclosed in an outer rotor, which is enclosed in an inner rotor. The stator has a first coil and a second coil. The battery pack is electrically connected to the first coil and the second coil. When the battery pack supplies power to the first coil, the outer rotor rotates. When the inner rotor rotates, the inner rotor charges the battery pack through the second coil.

[0009] The inner rotor is coaxially connected to the sun gear, and the outer rotor is connected to the input end of the ring gear;

[0010] The output end of the ring gear, the speed reduction mechanism and the output shaft are sequentially connected in transmission, and the output shaft is used to connect to the wheels.

[0011] In one possible implementation, the hybrid transmission system has a pure electric drive mode and a hybrid drive mode;

[0012] In the pure electric drive mode, the engine does not work, the battery pack supplies power to the first coil, and the outer rotor drives the wheels through the ring gear, the reduction mechanism, and the output shaft in sequence;

[0013] In the hybrid mode, the engine is working, and part of the power of the engine drives the inner rotor through the planetary carrier, the planetary gear and the sun gear in sequence, and the other part of the power drives the ring gear through the planetary carrier and the planetary gear in sequence, and the ring gear drives the wheels through the reduction mechanism and the output shaft in sequence, the battery pack supplies power to the first coil, and the outer rotor drives the wheels through the ring gear, the reduction mechanism and the output shaft in sequence.

[0014] In a possible implementation, in the pure electric driving mode, the hybrid power system has an energy recovery operating condition;

[0015] In the energy recovery operating condition, the wheel decelerates, and the wheel drives the outer rotor to rotate through the output shaft, the deceleration mechanism, and the ring gear in sequence, and the outer rotor charges the battery pack through the first coil.

[0016] In a possible implementation, the ring gear extends between the inner rotor and the outer rotor, and the extending length is less than the axial length of the inner rotor and the outer rotor.

[0017] In a possible implementation, the hybrid transmission system further includes a one-way clutch;

[0018] The one-way clutch includes an outer ring structure and an inner ring structure. The outer ring structure surrounds the inner ring structure. The outer ring structure is fixed to the housing of the hybrid power transmission system, and the inner ring structure surrounds the output shaft of the engine.

[0019] In a possible implementation, the hybrid power transmission system further includes a clutch, and the clutch is connected to the output end of the ring gear.

[0020] The hybrid power transmission system has a parking power generation mode. In the parking power generation mode, the engine rotates. The engine drives the inner rotor through the planet carrier, the planet gears, and the sun gear in sequence. The inner rotor charges the battery pack through the second coil. The clutch is engaged, and the clutch is used to fix the ring gear.

[0021] In a possible implementation, the clutch includes a first sub-clutch mechanism and a second sub-clutch mechanism. The first sub-clutch mechanism is connected to the output end of the ring gear, and the second sub-clutch mechanism is fixed to the housing of the hybrid power transmission system.

[0022] In the parking power generation mode, the first sub-clutch mechanism and the second sub-clutch mechanism are engaged.

[0023] In a possible implementation,

[0024] The reduction mechanism includes a first gear, a second gear, a third gear, and a fourth gear.

[0025] The first gear is coaxially connected to the ring gear. The second gear meshes with the first gear. The third gear is coaxially connected to the second gear. The third gear meshes with the fourth gear. The fourth gear is in transmission connection with the output shaft.

[0026] The diameter of the first gear is smaller than that of the second gear.

[0027] The diameter of the third gear is smaller than that of the second gear and the fourth gear.

[0028] In a possible implementation, the diameter ratio of the second gear to the third gear is 1.5 - 2.

[0029] In a possible implementation, the hybrid power transmission system further includes a differential.

[0030] The output shaft includes a first half shaft and a second half shaft. The input end of the differential is in transmission connection with the fourth gear, and the output end is in transmission connection with the first half shaft and the second half shaft. The first half shaft and the second half shaft are also in transmission connection with the wheels.

[0031] In a second aspect, the present disclosure provides a vehicle, which includes the hybrid powertrain system according to any one of the first aspect.

[0032] The technical solutions provided by the present disclosure at least include the following beneficial effects:

[0033] The present disclosure provides a hybrid powertrain system. The hybrid powertrain system uses a dual-rotor motor to replace the two motors in the related art. The inner rotor and the outer rotor in the dual-rotor motor share a stator, and the outer rotor surrounds the inner rotor. Therefore, the dual-rotor motor occupies a smaller space, so that the hybrid powertrain system occupies a smaller space, and thus it is convenient to arrange the hybrid powertrain system in the vehicle.

[0034] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. In the drawings:

[0036] Figure 1 is a schematic structural diagram of a hybrid system shown in an embodiment of the present disclosure;

[0037] Figure 2 is a schematic diagram of the power transmission of a hybrid system in a pure electric drive mode shown in an embodiment of the present disclosure;

[0038] Figure 3 is a schematic diagram of the power transmission of a hybrid system in a hybrid mode shown in an embodiment of the present disclosure;

[0039] Figure 4 is a schematic diagram of the power transmission of a hybrid system in a parking power generation mode shown in an embodiment of the present disclosure.

[0040] Legend description:

[0041] 1. Engine;

[0042] 2. Planetary gear train, 21. Planet carrier, 22. Sun gear, 23. Planet gear, 24. Ring gear;

[0043] 3. Dual-rotor motor, 31. Inner rotor, 32. Outer rotor, 33. Stator, 34. Battery pack;

[0044] 4. Reduction mechanism, 41. First gear, 42. Second gear, 43. Third gear, 44. Fourth gear;

[0045] 5. Output shaft, 51. First half shaft, 52. Second half shaft;

[0046] 6. One-way clutch, 61. Outer ring structure, 62. Inner ring structure;

[0047] 7. Clutch, 71. First sub-clutch mechanism, 72. Second sub-clutch mechanism;

[0048] 8. Differential;

[0049] 100. Wheel.

[0050] Through the above-mentioned drawings, specific embodiments of the present disclosure have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concept of the present disclosure to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0051] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the drawings.

[0052] The terms used in the embodiments of the present disclosure are only for explaining the embodiments of the present disclosure and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The "first", "second", "third", and similar terms used in the specification and claims of the present patent application do not denote any order, quantity, or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "one" do not denote a quantity limitation, but mean that there is at least one. The terms "include" or "comprise" and similar terms mean that the elements or items appearing before "include" or "comprise" cover the elements or items listed after "include" or "comprise" and their equivalents, and do not exclude other elements or items. The terms "connect" or "be connected" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0053] The hybrid power transmission system is an important component in hybrid vehicles, using an engine and an electric motor as power sources. This enables the vehicle to achieve a driving mode that can use either fuel or electricity, thus combining power performance and economy.

[0054] In the related art, the power sources of the hybrid power transmission system include one engine and two electric motors, and different driving modes are switched by switching different power sources.

[0055] However, hybrid transmission systems in related technologies are mostly developed based on traditional automatic transmissions, simply integrating the motor at the front or back end of a transmission such as an AT (Automatic Transmission), AMT (Automated Mechanical Transmission), CVT (Continuously Variable Transmission), or DCT (Dual Clutch Transmission). Although this type of hybrid system has relatively low technical difficulty and requires less R&D investment, its structure is relatively complex and occupies a large volume, making it difficult to deploy the hybrid transmission system in a vehicle.

[0056] In view of the above technical problems, the embodiment of the present disclosure provides a hybrid transmission system, such as Figure 1 As shown, the hybrid transmission system includes an engine 1, a planetary gear train 2, a dual-rotor motor 3, a reduction gear mechanism 4, and an output shaft 5. The planetary gear train 2 includes a planetary carrier 21, a sun gear 22, planetary gears 23, and a ring gear 24. The ring gear 24 surrounds the sun gear 22, and the planetary gears 23 are located between the ring gear 24 and the sun gear 22. The input end of the planetary carrier 21 is connected to the engine 1, and the output end is connected to the planetary gears 23. The dual-rotor motor 3 includes an inner rotor 31, an outer rotor 32, a stator 33, and a battery pack 34. The stator 33 surrounds the outer rotor 32, which in turn surrounds the inner rotor 31. The stator 33 has a first coil and a second coil, and the battery pack 34 is electrically connected to the first and second coils. When the battery pack 34 supplies power to the first coil, the outer rotor 32 rotates. When the inner rotor 31 rotates, the inner rotor 31 charges the battery pack 34 through the second coil. The inner rotor 31 is coaxially connected to the sun gear 22, and the outer rotor 32 is connected to the input end of the ring gear 24. The output end of the ring gear 24 , the reduction mechanism 4 and the output shaft 5 are sequentially connected in a transmission manner, and the output shaft 5 is used to connect to the wheel 100 .

[0057] The stator 33 and outer rotor 32 form the first motor, while the stator 33 and inner rotor 31 form the second motor. The battery pack 34 can power the first and second coils, respectively. The outer rotor 32 or the inner rotor 31 rotates under electromagnetic induction, converting electrical energy into mechanical energy. In this case, both the first and second motors function as electric motors. Conversely, when the battery pack 34 is low on charge, the outer rotor 32 or the inner rotor 31 rotates under external force, charging the battery pack 34 through the first and second coils, respectively, or providing power to other electrical appliances in the vehicle. In this case, both the first and second motors function as generators.

[0058] The hybrid transmission system has a housing, and the planetary gear train 2, the dual-rotor motor 3, and the reduction mechanism 4 are located inside the housing. The housing can protect the planetary gear train 2, the dual-rotor motor 3, and the reduction mechanism 4.

[0059] The hybrid transmission system has a planetary gear train 2. The hybrid transmission system can be a continuously variable transmission system, that is, the transmission ratio of the hybrid transmission system is a series of continuous values, thereby achieving good economy, power performance, and driving smoothness.

[0060] In the technical solution provided by the embodiments of the present disclosure, the hybrid transmission system uses a dual-rotor motor 3 to replace two motors in the related art. The inner rotor 31 and the outer rotor 32 in the dual-rotor motor 3 share a stator 33, and the outer rotor 32 surrounds the inner rotor 31. Therefore, the dual-rotor motor 3 occupies less space, so that the hybrid transmission system occupies less space, and thus it is convenient to arrange the hybrid transmission system in a vehicle.

[0061] In some examples, the hybrid transmission system has a pure electric drive mode and a hybrid mode.

[0062] As Figure 2 shown, in the pure electric drive mode, the engine 1 does not work. The battery pack 34 supplies power to the first coil, causing the outer rotor 32 to rotate. The outer rotor 32 drives the wheel 100 through the ring gear 24, the reduction mechanism 4, and the output shaft 5 in sequence.

[0063] The pure electric drive mode is applicable to the vehicle starting stage and low-speed driving conditions, and can avoid energy loss caused by frequent start and stop of the engine 1, thereby improving the fuel saving rate.

[0064] As Figure 3 shown, in the hybrid mode, the engine 1 rotates. A part of the power of the engine 1 drives the inner rotor 31 through the planet carrier 21, the planet gears 23, and the sun gear 22 in sequence, causing the inner rotor 31 to generate electricity. Another part of the power of the engine 1 drives the ring gear 24 through the planet carrier 21 and the planet gears 23. The battery pack 34 drives the outer rotor 32 by energizing the first coil, causing the outer rotor 32 to drive the ring gear 24. The electricity generated by the inner rotor 31 and the electricity generated by the battery pack 34 are converted from direct current to three-phase alternating current through an inverter / transformer and then drive the outer rotor 32 to rotate, causing the outer rotor 32 to drive the ring gear 24 to rotate. The above process realizes that the engine 1 and the battery pack 34 jointly drive the ring gear 24. The power of the ring gear 24 is transmitted to the reduction mechanism 4 and the output shaft 5 in sequence, and finally transmitted to the wheel 100.

[0065] The hybrid mode is applicable to the vehicle in medium-speed and high-speed driving conditions, can provide sufficient power for the vehicle, and also greatly improves the overall vehicle smoothness, meeting the comfort requirements of users.

[0066] In some examples, in the pure electric drive mode, the hybrid power system has an energy recovery condition. Under the energy recovery condition, the wheel 100 decelerates, and the wheel 100 drives the outer rotor 32 to rotate through the output shaft 5, the reduction mechanism 4, and the ring gear 24 in sequence. The outer rotor 32 charges the battery pack 34 through the first coil, so that the dual-rotor motor 3 can convert the kinetic energy of the vehicle into electric energy through negative torque. Among them, a part of the electric energy generated by the outer rotor 32 can also be supplied to other electrical devices in the vehicle for use, and the excess electric energy is stored in the battery pack 34.

[0067] In some examples, in the pure electric drive mode, the hybrid power system also has a reverse condition. Under the reverse condition, the battery pack 34 drives the outer rotor 32 to reverse, so that the wheel 100 reverses, and then the vehicle can reverse. Since the vehicle speed is slow and the reverse time is short under the reverse condition, the engine 1 does not need to participate in driving, which can reduce the fuel consumption of the vehicle. In this way, the hybrid power system does not need to be provided with a reverse gear, thereby reducing the number of components in the hybrid power system, making the structure of the hybrid power system relatively simple, and reducing the volume of the hybrid power system. Among them, the rotation direction of the outer rotor 32 during reverse is opposite to the rotation direction of the outer rotor 32 when the vehicle is moving forward.

[0068] In some examples, as Figure 1 shown, the ring gear 24 extends into the space between the inner rotor 31 and the outer rotor 32, and the extending length is less than the axial lengths of the inner rotor 31 and the outer rotor 32. A part of the outer rotor 32 is opposite to the inner rotor 31, and the other part surrounds the ring gear 24, and the ring gear 24 is connected to the inner side of the outer rotor 32. If the ring gear 24 is connected to the outer side of the outer rotor 32, the ring gear 24 will be located between the outer rotor 32 and the stator 33, resulting in a part of the magnetic field between the stator 33 and the outer rotor 32 being blocked, making the magnetic field unstable, thereby affecting the electromagnetic induction between the stator 33 and the outer rotor 32, and further affecting the rotation of the outer rotor 32.

[0069] Exemplarily, the ring gear 24 can be only connected to the inner edge of the outer rotor 32, so as to prevent the ring gear 24 from extending into the space between the outer rotor 32 and the inner rotor 31, and prevent the ring gear 24 from affecting the magnetic field between the inner rotor 31 and the stator 33, and further ensure that the inner rotor 31 can rotate normally.

[0070] In some examples, as Figure 1As shown, the hybrid transmission system further includes a one-way clutch 6. The one-way clutch 6 is connected to the output shaft of the engine 1, and the one-way clutch 6 is used to prevent the output shaft of the engine 1 from changing the direction of rotation. Among them, the one-way clutch 6 can also be called a one-way bearing. The one-way clutch 6 includes an outer ring structure 61 and an inner ring structure 62. The outer ring structure 61 surrounds the inner ring structure 62, and the outer ring structure 61 is fixed to the housing of the hybrid transmission system, and the inner ring structure 62 surrounds the output shaft of the engine 1.

[0071] The one-way clutch 6 can only transmit power in a single direction (clockwise or counterclockwise), that is, the inner ring structure 62 can only rotate in a single direction, so that the engine 1 can only rotate in a certain direction. When the output shaft of the engine 1 has a tendency to rotate in the other direction, the inner ring structure 62 is locked under the action of the outer ring structure 61, thereby preventing the engine 1 from rotating. In this way, when the engine 1 is working, the one-way clutch 6 will not affect the rotation of the engine 1. When the engine 1 is not working, if the vehicle reverses, that is, the outer rotor 32 rotates in reverse, the one-way clutch 6 can prevent the engine 1 from rotating in reverse accordingly, thereby avoiding abnormal combustion of the engine 1 and causing damage to the engine 1.

[0072] In some examples, as Figure 1 shown, the hybrid transmission system further includes a clutch 7. The hybrid transmission system further includes a clutch 7, and the clutch 7 is connected to the output end of the ring gear 24. The hybrid transmission system has a parking power generation mode. In the parking power generation mode, the engine 1 rotates, and the engine 1 drives the inner rotor 31 through the planet carrier 21, the planet gears 23 and the sun gear 22 in sequence, and the inner rotor 31 charges the battery pack 34 through the second coil. The clutch 7 engages, and the clutch 7 is used to fix the ring gear 24, so the output shaft 5 cannot rotate, thereby preventing the power generated by the inner rotor 31 from driving the output shaft 5, thereby increasing the charging speed of the battery pack 34. In addition, the power generated by the inner rotor 31 can also be used by other electrical devices in the vehicle.

[0073] In some examples, as Figure 1 shown, the clutch 7 includes a first sub-clutch mechanism 71 and a second sub-clutch mechanism 72. The first sub-clutch mechanism 71 is connected to the output end of the ring gear 24, and the second sub-clutch mechanism 72 is fixed to the housing of the hybrid transmission system. When the first sub-clutch mechanism 71 and the second sub-clutch mechanism 72 are separated, the power of the ring gear 24 can be transmitted to the reduction mechanism 4. When the first sub-clutch mechanism 71 and the second sub-clutch mechanism 72 are engaged, the ring gear 24 is fixed. In the parking power generation mode, the first sub-clutch mechanism 71 and the second sub-clutch mechanism 72 are combined.

[0074] As Figure 2As shown, in the pure electric drive mode, the first sub-clutch mechanism 71 and the second sub-clutch mechanism 72 are disengaged, enabling the ring gear 24 to rotate under the drive of an external force. The outer rotor 32 rotates driven by the battery pack 34, and the outer rotor 32 drives the ring gear 24 to rotate. Thus, the power of the ring gear 24 is transmitted to the output shaft 5 through the reduction mechanism 4, and then drives the wheel 100 to rotate.

[0075] As Figure 3 shown, in the hybrid drive mode, the first sub-clutch mechanism 71 and the second sub-clutch mechanism 72 are disengaged, enabling the ring gear 24 to rotate under the drive of an external force. A part of the power of the engine 1 is sequentially transmitted to the inner rotor 31 through the planet carrier 21, the planet gears 23 and the sun gear 22, causing the inner rotor 31 to generate electricity. The electricity generated by the inner rotor 31 and the electricity generated by the battery pack 34 are together converted from direct current to three-phase alternating current through an inverter / transformer and then drive the outer rotor 32 to rotate, causing the outer rotor 32 to drive the ring gear 24 to rotate. At the same time, another part of the power of the engine 1 is sequentially transmitted to the ring gear 24 through the planet carrier 21 and the planet gears 23. Thus, the engine 1 and the battery pack 34 jointly drive the ring gear 24.

[0076] As Figure 4 shown, in the parking power generation mode, the first sub-clutch mechanism 71 is combined with the second sub-clutch mechanism 72, and the engine 1 drives the inner rotor 31 to rotate, and the inner rotor 31 charges the battery pack 34. The power of the engine 1 drives the inner rotor 31 to rotate through the planet carrier 21 and the sun gear 22, thereby charging the battery pack 34. Since the first sub-clutch mechanism 71 is combined with the second sub-clutch mechanism 72, the ring gear 24 cannot rotate under the drive of an external force. Thus, the reduction mechanism 4 cannot transmit power, and further the output shaft 5 cannot rotate, thereby preventing the output shaft 5 from rotating to drive the vehicle when the engine 1 is working.

[0077] In some examples, as Figure 1 shown, the reduction mechanism 4 includes a first gear 41, a second gear 42, a third gear 43 and a fourth gear 44. The first gear 41 is coaxially connected to the ring gear 24, the second gear 42 meshes with the first gear 41, and the third gear 43 is coaxially connected to the second gear 42. The third gear 43 meshes with the fourth gear 44, and the fourth gear 44 is in transmission connection with the output shaft 5. When the ring gear 24 rotates, it drives the first gear 41 to rotate, and since the ring gear 24 is coaxially connected to the first gear 41, the rotational speeds of the first gear 41 and the ring gear 24 are the same. At the same time, the first gear 41 drives the second gear 42 to rotate. Since the third gear 43 is coaxially connected to the second gear 42, the second gear 42 drives the third gear 43 to rotate, and the rotational speed of the third gear 43 is the same as that of the second gear 42. The third gear 43 drives the fourth gear 44 to rotate, thereby driving the output shaft 5.

[0078] The diameter of the first gear 41 is smaller than that of the second gear 42, thereby achieving the reduction of speed and increase of torque from the first gear 41 to the second gear 42. Since the third gear 43 is coaxially connected to the second gear 42, the rotational speed of the third gear 43 is the same as that of the second gear 42. When the third gear 43 meshes with the fourth gear 44, due to the smaller diameter of the third gear 43, the transmission ratio between the third gear 43 and the fourth gear 44 can be reduced, thereby increasing the torque transmitted to the output shaft 5, which is beneficial to quickly driving the output shaft 5. Thus, a two-stage reduction between the ring gear 24 and the output shaft 5 is achieved.

[0079] In some examples, the diameter ratio of the second gear 42 to the third gear 43 is 1.5 - 2. The larger the diameter ratio of the second gear 42 to the third gear 43, the more obvious the deceleration of the reduction mechanism 4.

[0080] In other examples, the reduction mechanism 4 can also be of other structures. For example, the reduction mechanism 4 can be a parallel-axis gear set, that is, three gears mesh in sequence. The embodiment of the present disclosure does not specifically limit the structure of the reduction mechanism 4, and the number and arrangement of the gears in the reduction mechanism 4 can be set according to the actual situation, and the corresponding transmission ratio can be set.

[0081] In some examples, as Figure 1 shown, the hybrid power transmission system further includes a differential 8, and the output shaft 5 includes a first half shaft 51 and a second half shaft 52. The input end of the differential 8 is drivingly connected to the fourth gear 44, and the output end is drivingly connected to the first half shaft 51 and the second half shaft 52. When the vehicle turns, the differential 8 can make the rotational speeds of the first half shaft 51 and the second half shaft 52 different, so that the vehicle can turn smoothly.

[0082] Next, an exemplary description of the working process of the hybrid power transmission system will be given.

[0083] In the starting stage and low-speed driving stage of the vehicle, the hybrid power transmission system is in the pure electric drive mode. As Figure 2 shown, at this time, the battery pack 34 supplies power to the outer rotor 32, thereby driving the outer rotor 32 to rotate. At the same time, the first sub-clutch mechanism 71 is separated from the second sub-clutch mechanism 72. Thus, the outer rotor 32 drives the ring gear 24 to rotate, and then the ring gear 24 transmits the power to the first gear 41, the second gear 42, the third gear 43 and the output shaft 5 in sequence, driving the wheel 100 to rotate in sequence.

[0084] When the vehicle is in the medium-speed and high-speed driving stages, the hybrid power system is in the hybrid drive mode. As Figure 3As shown in the figure, the engine 1 rotates, and the engine 1 drives the inner rotor 31 to rotate. At the same time, the battery pack 34 drives the outer rotor 32 to rotate. A part of the power of the engine 1 is sequentially transmitted to the inner rotor 31 through the planet carrier 21, the planet gear 23, and the sun gear 22, so that the inner rotor 31 generates electricity. The electricity generated by the inner rotor 31 and the electricity generated by the battery pack 34 are converted into three-phase alternating current through an inverter / transformer together and then drive the outer rotor 32 to rotate, so that the outer rotor 32 drives the ring gear 24 to rotate. At the same time, another part of the power of the engine 1 is sequentially transmitted to the ring gear 24 through the planet carrier 21 and the planet gear 23. Thus, the engine 1 and the battery pack 34 jointly drive the ring gear 24, and then the ring gear 24 sequentially transmits the power to the first gear 41, the second gear 42, the third gear 43, and the output shaft 5, thereby driving the wheel 100 to rotate.

[0085] When the power of the vehicle is low and the vehicle is parked, the hybrid transmission system is in the parking power generation mode. As Figure 4 shown in the figure, the engine 1 rotates, thereby driving the inner rotor 31 to rotate. At this time, the inner rotor 31 charges the battery pack 34. At the same time, the first sub-clutch mechanism 71 is combined with the second sub-clutch mechanism 72. Therefore, the ring gear 24 cannot rotate under the drive of an external force, and further the output shaft 5 cannot rotate.

[0086] The embodiment of the present disclosure also provides a vehicle, and the vehicle includes the above hybrid transmission system.

[0087] The present disclosure does not specifically limit the type of the vehicle. For example, sedans, buses, trucks, sport utility vehicles (SUVs), etc.

[0088] In the technical solution provided by the embodiment of the present disclosure, the hybrid transmission system uses a dual-rotor motor 3 to replace two motors in the related art. The inner rotor 31 and the outer rotor 32 in the dual-rotor motor 3 share a stator 33, and the outer rotor 32 surrounds the inner rotor 31. Therefore, the dual-rotor motor 3 occupies a small space, so that the hybrid transmission system occupies a small space, and further it is convenient to arrange the hybrid transmission system in the vehicle.

[0089] The above are only the optional embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A hybrid transmission system, characterized in that, The hybrid power transmission system comprises an engine (1), a planetary gear train (2), a dual-rotor motor (3), a speed reduction mechanism (4) and an output shaft (5); The planetary gear train (2) comprises a planet carrier (21), a sun gear (22), planetary gears (23) and a ring gear (24), wherein the ring gear (24) surrounds the sun gear (22), and the planetary gears (23) are located between the ring gear (24) and the sun gear (22). The input end of the planet carrier (21) is connected to the engine (1), and the output end is connected to the planetary gears (23); The dual-rotor motor (3) comprises an inner rotor (31), an outer rotor (32), a stator (33) and a battery pack (34); the stator (33) is encircled by the outer rotor (32); the outer rotor (32) is encircled by the inner rotor (31); the stator (33) has a first coil and a second coil; the battery pack (34) is electrically connected to the first coil and the second coil; when the battery pack (34) supplies power to the first coil, the outer rotor (32) rotates; when the inner rotor (31) rotates, the inner rotor (31) charges the battery pack (34) through the second coil; The inner rotor (31) is coaxially connected to the sun gear (22), and the outer rotor (32) is connected to the input end of the ring gear (24); The output end of the ring gear (24), the speed reduction mechanism (4) and the output shaft (5) are sequentially connected in a transmission manner, and the output shaft (5) is used to connect to the wheel (100).

2. The hybrid transmission system according to claim 1, wherein The hybrid transmission system has a pure electric drive mode and a hybrid drive mode; In the pure electric drive mode, the engine (1) does not operate, the battery pack (34) supplies power to the first coil, and the outer rotor (32) drives the wheel (100) in sequence through the ring gear (24), the speed reduction mechanism (4), and the output shaft (5); In the hybrid mode, the engine (1) is in operation, a portion of the power of the engine (1) drives the inner rotor (31) through the planetary carrier (21), the planetary gear (23) and the sun gear (22) in sequence, and another portion of the power drives the ring gear (24) through the planetary carrier (21) and the planetary gear (23) in sequence, and the ring gear (24) drives the wheel (100) through the reduction mechanism (4) and the output shaft (5) in sequence, the battery pack (34) supplies power to the first coil, and the outer rotor (32) drives the wheel (100) through the ring gear (24), the reduction mechanism (4) and the output shaft (5) in sequence.

3. The hybrid transmission system according to claim 2, wherein In the pure electric driving mode, the hybrid system has an energy recovery working condition; Under the energy recovery operating condition, the wheel (100) decelerates, and the wheel (100) drives the outer rotor (32) to rotate through the output shaft (5), the deceleration mechanism (4), and the ring gear (24) in sequence, and the outer rotor (32) charges the battery pack (34) through the first coil.

4. The hybrid transmission system according to claim 1, wherein, The ring gear (24) extends between the inner rotor (31) and the outer rotor (32) shown, and the extending length is less than the axial lengths of the inner rotor (31) and the outer rotor (32).

5. The hybrid transmission system according to claim 1, wherein The hybrid transmission system further includes a one-way clutch (6); The one-way clutch (6) includes an outer ring structure (61) and an inner ring structure (62). The outer ring structure (61) surrounds the inner ring structure (62). The outer ring structure (61) is fixed to the housing of the hybrid transmission system, and the inner ring structure (62) surrounds the output shaft of the engine (1).

6. The hybrid transmission system according to claim 1, characterized in that The hybrid transmission system further includes a clutch (7), and the clutch (7) is connected to the output end of the ring gear (24); The hybrid transmission system has a parked power generation mode. In the parked power generation mode, the engine (1) rotates. The engine (1) drives the inner rotor (31) through the planet carrier (21), the planet gears (23) and the sun gear (22) in sequence. The inner rotor (31) charges the battery pack (34) through the second coil. The clutch (7) is engaged, and the clutch (7) is used to fix the ring gear (24).

7. The hybrid transmission system according to claim 6, characterized in that, The clutch (7) includes a first sub-clutch mechanism (71) and a second sub-clutch mechanism (72). The first sub-clutch mechanism (71) is connected to the output end of the ring gear (24), and the second sub-clutch mechanism (72) is fixed to the housing of the hybrid transmission system; In the parked power generation mode, the first sub-clutch mechanism (71) and the second sub-clutch mechanism (72) are engaged.

8. The hybrid transmission system according to any one of claims 1-7, characterized in that, The reduction mechanism (4) includes a first gear (41), a second gear (42), a third gear (43) and a fourth gear (44); The first gear (41) is coaxially connected to the ring gear (24). The second gear (42) meshes with the first gear (41). The third gear (43) is coaxially connected to the second gear (42). The third gear (43) meshes with the fourth gear (44). The fourth gear (44) is in transmission connection with the output shaft (5); The diameter of the first gear (41) is smaller than the diameter of the second gear (42); The diameter of the third gear (43) is smaller than the diameters of the second gear (42) and the fourth gear (44).

9. The hybrid transmission system according to claim 8, characterized in that, The diameter ratio of the second gear (42) to the third gear (43) is 1.5 - 2.

10. A vehicle, characterized in that, The vehicle includes the hybrid transmission system according to any one of claims 1 - 9.

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