Hybrid power electric drive system and vehicle

Abstract

The invention discloses a hybrid power electric drive system and a vehicle, and belongs to the technical field of vehicle engineering. The hybrid power electric drive system comprises a first planet row, a first motor, an engine, a first coupler, a second coupler, a third coupler, a differential mechanism, a second planet row and a second motor. Wherein the first planet row comprises an inner gear ring shaft, an inner gear ring, a sun gear, a planet gear, a planet carrier and an outer gear ring; the first motor is connected with the sun gear; the engine is connected with the planet carrier; the first coupler is connected with the inner gear ring shaft and the outer gear ring; the second coupler is connected with the inner gear ring shaft and the gearbox shell; the third coupler is connected with the planet carrier and the gearbox shell; the differential mechanism is in transmission connection with the outer gear ring and is connected with the axle; the second planet row is in transmission connection with the differential; the second motor is in transmission connection with the second planet row.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicles, and particularly relates to a hybrid electric drive system and a vehicle. BACKGROUND

[0002] The hybrid electric drive system (Dedicated Hybrid Transmission, referred to as DHT) is a highly integrated electric drive transmission system specially designed for hybrid electric vehicles (HEV) or plug-in hybrid electric vehicles (PHEV). Its core idea is to highly integrate the driving motor, the first motor (sometimes the same motor), the gearbox (usually with multiple gears), and related control logic, clutches, and other components inside a compact housing to form a complete functional, optimized power coupling and transmission unit.

[0003] The current hybrid electric drive system (DHT) is generally developing towards the trend of integration and miniaturization, and a simple integrated small configuration is urgently needed to meet the power supply and economic demand of the vehicle. This results in the related art, where the hybrid drive system has multiple modes, but the switching between multiple modes is complex; the single-gear scheme cannot simultaneously meet the power and economic demand; the multi-gear scheme requires an additional gear shifting mechanism, which is structurally complex, high in cost, and long in axial size. SUMMARY

[0004] The present application provides a hybrid electric drive system and a vehicle, which aims to at least partially solve the technical problems of complex switching operation between multiple modes of the hybrid drive system and excessive axial size. To this end,

[0005] In one aspect of the present application, a hybrid electric drive system is provided, comprising:

[0006] A first planetary gear set, comprising an inner ring shaft, an inner ring connected to the inner ring shaft, a sun gear located at the center of the inner ring, a plurality of planet gears meshing between the inner ring and the sun gear, a planet carrier rotatingly connected to the plurality of planet gears, and an outer ring;

[0007] A first motor connected to the sun gear;

[0008] An engine connected to the planet carrier;

[0009] A first coupling connected to the inner ring shaft and the outer ring to combine or disconnect the inner ring shaft and the outer ring;

[0010] A second coupling connected to the inner ring shaft and a gearbox housing to combine or disconnect the inner ring shaft and the gearbox housing;

[0011] a third coupling, connected with the planetary carrier and the gearbox housing, to combine or disconnect the planetary carrier with the gearbox housing;

[0012] a differential, drivingly connected with the outer ring gear and connected with an axle;

[0013] a second planetary gear set, drivingly connected with the differential;

[0014] a second motor, drivingly connected with the second planetary gear set.

[0015] In some embodiments, an extension structure is arranged on the planetary carrier, and the extension structure is connected with the gearbox housing through the second coupling.

[0016] In some embodiments, the first coupling and the third coupling are integrated.

[0017] In some embodiments, the third coupling is an electromagnetic clutch or a hydraulic clutch.

[0018] In some embodiments, the hybrid electric drive system further comprises a torque limiter damper, and the engine is connected with the planetary carrier through the torque limiter damper.

[0019] In some embodiments, the hybrid electric drive system further comprises:

[0020] a first connecting shaft, one end of which is connected with the first motor and the other end of which is connected with the sun gear;

[0021] a second connecting shaft, one end of which is connected with the planetary carrier and the other end of which is connected with a crankshaft of the engine;

[0022] wherein the first connecting shaft and the second connecting shaft are coaxially arranged, and the first connecting shaft is arranged in parallel with the axle.

[0023] In some embodiments, the second connecting shaft is connected with the crankshaft through a torsional damper.

[0024] In some embodiments, the hybrid electric drive system further comprises a gear reduction mechanism, and the outer ring gear is drivingly connected with the differential through the gear reduction mechanism.

[0025] In some embodiments, the hybrid electric drive system further comprises a third connecting shaft connected with the second motor, the third connecting shaft is drivingly connected with the second planetary gear set, and the third connecting shaft is arranged in parallel with the axle.

[0026] Another aspect of the embodiments of the present application further provides a vehicle comprising the hybrid electric drive system.

[0027] The embodiments of the present application have at least the following beneficial effects:

[0028] The hybrid electric drive system provided by the embodiments of the present application comprises a first planetary gear set, a first motor, an engine, a first coupling, a second coupling, a third coupling, a differential, a second planetary gear set and a second motor. The first planetary gear set comprises a ring gear shaft, a ring gear connected to the ring gear shaft, a sun gear located at the center of the ring gear, a plurality of planet gears meshed between the ring gear and the sun gear, a planet carrier rotatably connected to the plurality of planet gears, and an outer gear. The first motor is connected to the sun gear. The engine is connected to the planet carrier. The first coupling is connected to the ring gear shaft and the outer gear to combine or disconnect the ring gear shaft and the outer gear. The second coupling is connected to the ring gear shaft and a transmission case to combine or disconnect the ring gear shaft and the transmission case. The third coupling is connected to the planet carrier and the transmission case to combine or disconnect the planet carrier and the transmission case. The differential is in driving connection with the outer gear and connected to an axle. The second planetary gear set is in driving connection with the differential. The second motor is in driving connection with the second planetary gear set.

[0029] Therefore, when the engine is directly driven, the first coupling combines the ring gear shaft and the outer gear, the second coupling disconnects the planet carrier and the transmission case, and the third coupling disconnects the ring gear shaft and the transmission case. The power of the engine is transmitted to the ring gear shaft and the sun gear through the planet carrier and the planet gears. The ring gear shaft transmits the power to the differential through the ring gear and the outer gear. The differential drives the axle to move to realize vehicle driving. Meanwhile, the sun gear transmits the power to the first motor to drive the first motor to generate electricity, so that the first motor charges the battery, realizing power split of the engine, i.e., realizing that the engine drives on one side and generates electricity on the other side, and realizing engine direct drive.

[0030] When parallel driving is performed, the first coupling combines the ring gear shaft and the outer gear, the third coupling disconnects the ring gear shaft and the transmission case, and the second coupling disconnects the planet carrier and the transmission case. The power of the engine is transmitted to the ring gear shaft and the sun gear through the planet carrier and the planet gears. The ring gear shaft transmits the power to the differential through the ring gear and the outer gear. Meanwhile, the sun gear transmits the power to the first motor to drive the first motor to generate electricity, so that the first motor charges the battery, realizing power split of the engine, i.e., realizing that the engine drives on one side and generates electricity on the other side. Meanwhile, the battery supplies power to the second motor to start the second motor. The power of the second motor is transmitted to the differential. The differential drives the axle to move to realize vehicle driving, realizing parallel driving.

[0031] When the first pure electric drive is performed, the first coupling disconnects the inner ring shaft from the outer ring, the second coupling disconnects the planet carrier from the gearbox housing, and the third coupling disconnects the inner ring shaft from the gearbox housing, the engine and the first motor from the differential, the power of the second motor is transmitted to the differential, and the differential drives the axle to move to realize vehicle driving, thereby realizing the first pure electric drive.

[0032] When the second pure electric drive is performed, the first coupling connects the inner ring shaft with the outer ring, the third coupling disconnects the inner ring shaft from the gearbox housing, the second coupling connects the planet carrier with the gearbox housing, the planet carrier is connected with the gearbox housing to lock the planet carrier, the power of the first motor can be transmitted to the differential through the sun gear, the planet gear, the inner ring, the inner ring shaft and the outer ring; the power of the second motor is transmitted to the differential; under the drive of the first motor and the second motor, the differential drives the axle to move to realize vehicle driving, thereby realizing the second pure electric drive.

[0033] When the series drive is performed, the first coupling disconnects the inner ring shaft from the outer ring, the second coupling disconnects the planet carrier from the gearbox housing, and the third coupling disconnects the inner ring shaft from the gearbox housing, the engine and the first motor from the differential, the power of the engine is transmitted to the sun gear through the planet carrier and the planet gear, the sun gear drives the first motor to generate electricity, so that the engine and the first motor generate electricity at a constant speed ratio and charge the battery; the battery supplies power to the second motor, the power of the second motor is transmitted to the differential, the differential drives the axle to move to realize vehicle driving, thereby realizing the first motor generating electricity and the second motor driving.

[0034] When the brake energy recovery is performed, the first coupling disconnects the inner ring shaft from the outer ring, the second coupling disconnects the planet carrier from the gearbox housing, and the third coupling connects the inner ring shaft with the gearbox housing to lock the inner ring shaft and the gearbox housing, so that the power of the engine and the first motor cannot be transmitted to the differential; when the vehicle is in braking or coasting condition, the kinetic energy of the wheel is transmitted to the differential through the axle, the differential transmits the power to the second motor, the second motor reverses the torque to realize the second motor reversing to generate electricity and charge the battery, thereby realizing the brake energy recovery.

[0035] When the parking power generation is performed, the first coupling disconnects the inner ring shaft from the outer ring, the second coupling disconnects the planet carrier from the gearbox housing, and the third coupling connects the inner ring shaft with the gearbox housing to lock the inner ring shaft and the gearbox housing, so that the power of the engine and the first motor cannot be transmitted to the differential; the power of the engine is transmitted to the first motor through the planet carrier, the planet gear and the sun gear, drives the first motor to move to make the first motor charge the battery, thereby realizing the parking power generation.

[0036] When driving and generating electricity, the first coupling connects the inner ring shaft with the outer ring, the second coupling disconnects the planet carrier from the gearbox housing, and the third coupling disconnects the inner ring shaft from the gearbox housing. The power of the engine is transmitted to the inner ring shaft and the sun gear through the planet carrier and the planet gear. The inner ring shaft transmits power to the differential through the inner ring and the outer ring. The differential drives the axle to move, achieving vehicle driving. At the same time, the sun gear transmits power to the first motor to drive the first motor to generate electricity, so that the first motor charges the battery, achieving power split of the engine, i.e., driving and generating electricity at the same time.

[0037] When starting the engine, the first coupling disconnects the inner ring shaft from the outer ring, the second coupling disconnects the planet carrier from the gearbox housing, and the third coupling connects the inner ring shaft with the gearbox housing to lock the inner ring shaft and the gearbox housing. The engine is disconnected from the first motor and the differential. The power of the first motor is transmitted to the engine through the sun gear, the planet gear, and the planet carrier to drive the engine, achieving engine starting.

[0038] The application uses the first planetary gear set, the engine, the first coupling, the second coupling, the third coupling, the second motor, and the second planetary gear set to achieve series driving, parallel driving, power split, first pure electric driving, second pure electric driving, braking energy recovery, driving and generating electricity, parking and generating electricity, and starting the engine. Only the disconnection or connection of the first coupling, the second coupling, and the third coupling is needed to switch the driving mode, and the mode switching is simple. Moreover, without synchronizer, shift hub, shift motor, and other mechanisms, the overall structure of the hybrid power driving system is more compact, the system is simplified, the cost is reduced, the axial size of the hybrid power driving system is shortened, and the arrangement and mounting are facilitated.

[0039] The second planetary gear set of the application can reduce the speed and increase the torque of the second motor, and make the relative position of the second motor and the second differential more flexible, which is beneficial to the mounting of the second motor in different vehicle cabins.

[0040] The first motor of the application can generate electricity and drive. When the power demand is large, it participates in driving, effectively reduces the specifications of the second motor, and reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0042] Figure 1A structural schematic diagram of a hybrid electric drive system in the embodiment of the present application is shown.

[0043] Reference signs:

[0044] 10 - first planetary gear set, 11 - inner ring shaft, 12 - inner ring, 13 - sun gear, 14 - planet gear, 15 - planet carrier, 151 - extension structure, 16 - outer ring;

[0045] 21 - first motor, 211 - first connecting shaft, 22 - second motor, 221 - third connecting shaft;

[0046] 30 - engine, 31 - torsional vibration damper, 32 - crankshaft, 321 - second connecting shaft;

[0047] 41 - first coupling, 42 - second coupling, 43 - third coupling;

[0048] 50 - differential;

[0049] 60 - second planetary gear set;

[0050] 70 - transmission housing;

[0051] 80 - wheel shaft;

[0052] 90 - gear reduction mechanism. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0054] In addition, the reference numbers and / or reference letters can be repeated in different examples in the present application, and such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0055] The present application will be described below in combination with the drawings and with reference to specific embodiments:

[0056] The embodiments of the present application provide a hybrid electric drive system and a vehicle, which are designed to at least be able to solve the technical problems of complex switching operation between multiple modes of the hybrid drive system and excessive axial size specification.

[0057] Figure 1 This is a schematic diagram of the structure of the hybrid electric drive system provided in the embodiment of the present application. Figure 1 The hybrid electric drive system provided by the embodiment of the present application includes a first planetary gear 10, a first motor 21, an engine 30, a first coupler 41, a second coupler 42, a third coupler 43, a differential 50, a second planetary gear 60, and a second motor 22. The first planetary gear 10 includes an inner ring gear shaft 11, an inner ring gear 12 connected to the inner ring gear shaft 11, a sun gear 13 located at the center of the inner ring gear 12, a plurality of planetary gears 14 meshed between the inner ring gear 12 and the sun gear 13, a planetary gear carrier 15 rotatably connecting the plurality of planetary gears 14, and an outer ring gear 16; the first motor 21 is connected to the sun gear 13; the engine 30 is connected to the planetary gear carrier 15; the first coupler 41 is connected to the inner ring gear shaft 11 and the outer ring gear 16, so that the inner ring gear shaft 11 is connected to the outer ring gear 16. The ring gear 16 is engaged or disconnected; the second coupler 42 is connected to the inner ring gear shaft 11 and the transmission housing 70 to engage or disconnect the inner ring gear shaft 11 with the transmission housing 70; the third coupler 43 is connected to the planetary wheel carrier 15 and the transmission housing 70 to engage or disconnect the planetary wheel carrier 15 with the transmission housing 70; the differential 50 is drivingly connected to the outer ring gear 16 and to the axle 80; the second planetary row 60 is drivingly connected to the differential 50; and the second motor 22 is drivingly connected to the second planetary row 60.

[0058] In this embodiment, a hybrid electric drive system with two planetary gears and three couplers is employed. The system can achieve various drive mode switching through the coordination of the couplers and planetary gears to meet the needs of different operating conditions, demonstrating excellent adaptability. Furthermore, the system eliminates the need for a dedicated shift mechanism, resulting in a more compact structure, simplified system, and lower costs. Furthermore, the system also reduces axial dimensions, facilitating layout and installation.

[0059] Therefore, when the engine 30 is directly driven, the first coupler 41 connects the inner ring gear shaft 11 with the outer ring gear 16, the second coupler 42 disconnects the planetary wheel carrier 15 from the transmission housing 70, and the third coupler 43 disconnects the inner ring gear shaft 11 from the transmission housing 70. The power of the engine 30 is transmitted to the inner ring gear shaft 11 and the sun gear 13 through the planetary wheel carrier 15 and the planetary wheels 14. The inner ring gear shaft 11 transmits the power to the differential 50 through the inner ring gear 12 and the outer ring gear 16. The differential 50 drives the wheel axle 80 to move to enable the vehicle to travel; at the same time, the sun gear 13 transmits power to the first motor 21, driving the first motor 21 to generate electricity, so that the first motor 21 charges the battery, realizing power diversion of the engine 30, that is, the engine 30 is driven while generating electricity while driving, realizing direct drive of the engine 30.

[0060] When parallel driving is performed, the first coupling 41 combines the inner ring gear shaft 11 with the outer ring gear 16, the third coupling 43 disconnects the inner ring gear shaft 11 from the gearbox housing 70, the second coupling 42 disconnects the planet carrier 15 from the gearbox housing 70, the power of the engine 30 is transmitted to the inner ring gear shaft 11 and the sun gear 13 through the planet carrier and the planet gear 14, the inner ring gear shaft 11 transmits the power to the differential 50 through the inner ring gear 12 and the outer ring gear 16, at the same time, the sun gear 13 transmits the power to the first motor 21, drives the first motor 21 to generate electricity, so that the first motor 21 charges the battery, realizes the power split of the engine 30, that is, realizes driving and generating electricity at the same time; at the same time, the battery supplies power to the second motor 22, starts the second motor 22, the power of the second motor 22 is transmitted to the differential 50, the differential 50 drives the axle 80 to move, to realize vehicle driving, realizing parallel driving.

[0061] When the first pure electric driving is performed, the first coupling 41 disconnects the inner ring gear shaft 11 from the outer ring gear 16, the second coupling 42 disconnects the planet carrier 15 from the gearbox housing 70, the third coupling 43 disconnects the inner ring gear shaft 11 from the gearbox housing 70, the engine 30 and the first motor 21 from the differential 50, the power of the second motor 22 is transmitted to the differential 50, the differential 50 drives the axle 80 to move, to realize vehicle driving, realizing the first pure electric driving.

[0062] When the second pure electric driving is performed, the first coupling 41 combines the inner ring gear shaft 11 with the outer ring gear 16, the third coupling 43 disconnects the inner ring gear shaft 11 from the gearbox housing 70, the second coupling 42 combines the planet carrier 15 with the gearbox housing 70, the planet carrier 15 is connected with the gearbox housing 70, the planet carrier 15 is locked, the power of the first motor 21 can be transmitted to the differential 50 through the sun gear 13, the planet gear 14, the inner ring gear 12, the inner ring gear shaft 11 and the outer ring gear 16; the power of the second motor 22 is transmitted to the differential 50; under the driving of the first motor 21 and the second motor 22, the differential 50 drives the axle 80 to move, to realize vehicle driving, realizing the second pure electric driving.

[0063] When series driving is performed, the first coupling 41 disconnects the inner ring gear shaft 11 from the outer ring gear 16, the second coupling 42 disconnects the planet carrier 15 from the gearbox housing 70, and the third coupling 43 disconnects the inner ring gear shaft 11 from the gearbox housing 70, the engine 30 and the first motor 21 from the differential 50, the power of the engine 30 is transmitted to the sun gear 13 through the planet carrier 15 and the planet gear 14, the sun gear 13 drives the first motor 21 to generate electricity, so that the engine 30 and the first motor 21 generate electricity at a constant speed ratio, and charge the battery; the battery powers the second motor 22, the power of the second motor 22 is transmitted to the differential 50, the differential 50 drives the axle 80 to move, to realize vehicle driving, realizing the first motor 21 generating electricity and the second motor 22 driving.

[0064] When brake energy recovery is performed, the first coupling 41 disconnects the inner ring gear shaft 11 from the outer ring gear 16, the second coupling 42 disconnects the planet carrier 15 from the gearbox housing 70, and the third coupling 43 connects the inner ring gear shaft 11 to the gearbox housing 70 to lock the inner ring gear shaft 11 and the gearbox housing 70, so that the power of the engine 30 and the first motor 21 cannot be transmitted to the differential 50; when the vehicle is in braking and coasting conditions, the kinetic energy of the wheels is transmitted to the differential 50 through the axle 80, the differential 50 transmits the power to the second motor 22, the torque of the second motor 22 is reversed, to realize the second motor 22 reversing to generate electricity and charge the battery, thereby realizing brake energy recovery.

[0065] When parking power generation is performed, the first coupling 41 disconnects the inner ring gear shaft 11 from the outer ring gear 16, the second coupling 42 disconnects the planet carrier 15 from the gearbox housing 70, and the third coupling 43 connects the inner ring gear shaft 11 to the gearbox housing 70 to lock the inner ring gear shaft 11 and the gearbox housing 70, so that the power of the engine 30 and the first motor 21 cannot be transmitted to the differential 50; the power of the engine 30 is transmitted to the first motor 21 through the planet carrier 15, the planet gear 14 and the sun gear 13, to drive the first motor 21 to move, so that the first motor 21 charges the battery, realizing parking power generation.

[0066] When the vehicle is running, the first coupling 41 connects the inner ring shaft 11 with the outer ring 16, the second coupling 42 disconnects the planet carrier 15 from the gearbox housing 70, the third coupling 43 disconnects the inner ring shaft 11 from the gearbox housing 70, the power of the engine 30 is transmitted to the inner ring shaft 11 and the sun gear 13 through the planet carrier 15 and the planet gear 14, the inner ring shaft 11 transmits the power to the differential 50 through the inner ring 12 and the outer ring 16, the differential 50 drives the axle 80 to run, so as to realize the running of the vehicle; at the same time, the sun gear 13 transmits the power to the first motor 21 to drive the first motor 21 to generate electricity, so that the first motor 21 charges the battery, realizing the power split of the engine 30, that is, realizing the driving of the engine 30 and the vehicle running and generating electricity at the same time, and realizing the vehicle running and generating electricity.

[0067] When the engine is started in parking, the first coupling 41 disconnects the inner ring shaft 11 from the outer ring 16, the second coupling 42 disconnects the planet carrier 15 from the gearbox housing 70, the third coupling 43 connects the inner ring shaft 11 with the gearbox housing 70 to lock the inner ring shaft 11 and the gearbox housing 70, and the engine 30 is disconnected from the first motor 21 and the differential 50; the power of the first motor 21 is transmitted to the engine 30 through the sun gear 13, the planet gear 14 and the planet carrier 15 to drive the engine 30, so as to realize the starting of the engine 30 in parking.

[0068] The first planetary gear set 10, the first motor 21, the engine 30, the first coupling 41, the second coupling 42, the third coupling 43, the second motor 22 and the second planetary gear set 60 are used to realize the series driving, parallel driving, power split, first pure electric driving, second pure electric driving, braking energy recovery, vehicle running and generating electricity, starting the engine in parking and the like, only the disconnection or connection of the first coupling 41, the second coupling 42 and the third coupling 43 can realize the switching of the driving mode, and the mode switching is simple. Moreover, without the synchronizer, the shift hub, the shift motor and the like, the overall structure of the hybrid power driving system is more compact, the system is simplified, the cost is reduced, the axial dimension of the hybrid power driving system is shortened, and the arrangement and mounting are facilitated.

[0069] The second planetary gear set 60 of the application can reduce the speed and increase the torque of the second motor 22, and the relative position of the second motor 22 and the second differential 52 is more flexible, which is beneficial to the mounting of the second motor 22 in different vehicle cabins.

[0070] The first motor 21 of the embodiment can generate electricity and drive, participates in driving when the power demand is large, effectively reduces the specification of the second motor 22, and reduces the cost.

[0071] The following table is the working state table of the hybrid power electric driving system; wherein 0 represents disconnection, and 1 represents connection.

[0072] Mode switching logic of dual-motor, dual-planetary gear, and three-coupler hybrid drive system

[0073]

[0074] In some embodiments, an extension structure 151 is provided on the planetary wheel carrier 15, and the extension structure 151 is configured as a connection portion between the planetary wheel carrier 15 and the gearbox housing 70; the structural scale of the extension structure 151 can be made smaller relative to the planetary wheel carrier 15, thereby reducing the corresponding second coupler 42 can be made smaller, which can also reduce the difficulty of lubrication design and reduce costs overall.

[0075] In some embodiments, the first coupler 41 and the second coupler 42 can be mechanical one-way clutches with automatic control functions (using the speed difference between the inner and outer rings of the mechanical one-way clutch to achieve automatic locking or clutching), or electromagnetic or hydraulic clutches. Furthermore, the third coupler 43 must be an electromagnetic or hydraulic clutch.

[0076] In some embodiments, the first coupler 41 and the third coupler 43 are arranged in parallel and spaced apart along the axial direction of the axle 80, and the first coupler 41 and the third coupler 43 can be specifically designed to be integrated to achieve higher integration and smaller axial size, so as to further reduce the axial size of the hybrid drive system.

[0077] In some embodiments, in order to improve NVH (Noise, Vibration and Harshness) performance, the hybrid electric drive system also includes a torque limiting vibration damper 31, and the engine 30 is connected to the planetary wheel carrier 15 through the torque limiting vibration damper 31 to buffer vibration.

[0078] Specifically, the torque limiting vibration damper 31 may be connected to the crankshaft 32 of the engine 30 , and the torque limiting vibration damper 31 is transmission-connected to the planetary wheel carrier 15 via the second connecting shaft 321 .

[0079] The torsional vibration damper 31 absorbs vibration energy through elastic elements (such as rubber, springs) and damping elements (such as silicone oil), attenuates the torsional vibration amplitude to an allowable range, and improves NVH. At the same time, through elastic buffering and damping attenuation, the torque transmission is smoother and the impact and setbacks are reduced.

[0080] In some embodiments, in order to realize power transmission, the hybrid power drive system further comprises a first connecting shaft 211, one end of the first connecting shaft 211 is connected with the first motor 21, and the other end is connected with the sun gear 13. The second connecting shaft 321 is connected with the planet carrier 15 at one end and connected with the crankshaft 32 at the other end. Among them, the first connecting shaft 211 is coaxially arranged with the second connecting shaft 321; and the first connecting shaft 211 is arranged in parallel with the wheel shaft 80.

[0081] The power of the first motor 21 can be transmitted to the sun gear 13 through the first connecting shaft 211, and the power of the sun gear 13 can also be transmitted to the first motor 21 through the first connecting shaft 211. The power of the engine 30 can be transmitted to the planet carrier 15 through the crankshaft 32 and the second connecting shaft 321.

[0082] The crankshaft 32 of the engine 30 produces periodic torsional vibration under the action of combustion explosion and reciprocating inertia force, and if it is directly transmitted to the second connecting shaft 321, it will cause gear meshing impact, transmission belt flutter or motor rotor resonance.

[0083] In some embodiments, in order to improve the flexibility of the transmission structure, the hybrid power drive system further comprises a gear reduction mechanism 90, and the outer ring gear 16 is in driving connection with the differential 50 through the gear reduction mechanism 90.

[0084] Among them, the gear reduction mechanism 90 can adopt a multi-stage transmission gear set for multi-stage reduction.

[0085] In some embodiments, in order to realize power transmission, the hybrid power drive system further comprises a third connecting shaft 221 connected with the second motor 22, the third connecting shaft 221 is connected with the gear reduction mechanism 90, and the third connecting shaft 221 is arranged in parallel with the wheel shaft 80.

[0086] When the second motor 22 transmits power to the differential 50, the second motor 22 can transmit power to the gear reduction mechanism 90 through the third connecting shaft 221 and the second planetary row 60, and the gear reduction mechanism 90 transmits power to the wheel shaft 80 through the differential 50 to drive the vehicle to run.

[0087] Based on the same inventive concept, the application also proposes a vehicle which adopts the hybrid power drive system, the specific structure of which is referred to the above-mentioned embodiments. Since all the technical solutions of all the above-mentioned embodiments are adopted, at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments are achieved, which will not be described one by one here.

[0088] In the present application, unless specifically defined and limited otherwise, the "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "on", "above" and "above" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0089] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0090] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative positional relationship, motion condition and the like between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0091] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0092] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0093] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification.

[0094] In addition, the technical solutions among various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0095] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and deformations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A hybrid electric drive system, characterized in that: include: The first planetary gear set includes an inner ring gear shaft, an inner ring gear connected to the inner ring gear shaft, a sun gear located at the center of the inner ring gear, a plurality of planetary gears meshing between the inner ring gear and the sun gear, a planetary gear carrier rotatably connected to the plurality of planetary gears, and an outer ring gear; a first motor connected to the sun gear; an engine connected to the planetary wheel carrier; a first coupler connected to the inner gear ring shaft and the outer gear ring to couple or disconnect the inner gear ring shaft with the outer gear ring; a second coupler connected to the inner ring gear shaft and the gearbox housing to couple or disconnect the inner ring gear shaft from the gearbox housing; a third coupler connected to the planetary wheel carrier and the gearbox housing to couple or disconnect the planetary wheel carrier with the gearbox housing; a differential, drivingly connected to the outer ring gear and connected to the wheel axle; a second planetary gear, drivingly connected to the differential; The second motor is drivingly connected to the second planetary gear.

2. The hybrid electric drive system according to claim 1, wherein: An extension structure is provided on the planetary wheel carrier, and the extension structure is connected to the gearbox housing through the second coupler.

3. The hybrid electric drive system according to claim 1, wherein: The first coupler and the third coupler are integrated into one body.

4. The hybrid electric drive system according to claim 1, wherein: The third coupler is an electromagnetic clutch or a hydraulic clutch.

5. The hybrid electric drive system according to claim 1, wherein: The hybrid electric drive system further includes a torque limiting vibration damper, and the engine is connected to the planetary wheel carrier via the torque limiting vibration damper.

6. The hybrid electric drive system according to any one of claims 1 to 5, characterized in that: The hybrid electric drive system further includes: a first connecting shaft, one end of which is connected to the first motor, and the other end of which is connected to the sun gear; a second connecting shaft, one end of which is connected to the planetary wheel carrier and the other end of which is connected to the crankshaft of the engine; The first connecting shaft and the second connecting shaft are coaxially arranged, and the first connecting shaft and the wheel axle are parallel arranged.

7. The hybrid electric drive system according to claim 6, wherein: The second connecting shaft is connected to the crankshaft via a torsional vibration damper.

8. The hybrid electric drive system according to any one of claims 1 to 5, characterized in that: The hybrid electric drive system further includes a gear reduction mechanism, and the outer ring gear is drivingly connected to the differential via the gear reduction mechanism.

9. The hybrid electric drive system according to claim 8, characterized in that: The hybrid drive system further includes a third connecting shaft connected to the second motor, the third connecting shaft is drivingly connected to the second planetary gear, and the third connecting shaft is arranged parallel to the wheel axle.

10. A vehicle, characterized in that: Comprising a hybrid electric drive system as described in any one of claims 1-9.

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