Multi-gear hybrid power system and vehicle

Abstract

The utility model provides a multi-gear hybrid power system and a vehicle, and belongs to the technical field of vehicles, the multi-gear hybrid power system comprises an engine, a driving motor, a planetary system, a multi-gear gear set and an output gear set; the engine is connected with the planetary system through a first input shaft, and the planetary system is connected with the multi-gear gear set through a second input shaft. The multi-gear gear set is connected with an output gear set through a middle transmission shaft, and an output shaft is connected to the output gear set. The driving motor is connected with the planetary system through a hollow shaft, the second input shaft is sleeved with the hollow shaft in an empty mode, and the first gear set in the multi-gear gear set is connected to the hollow shaft. Through cooperation of the planetary system and the multi-gear gear set, large torque output in different working modes can be achieved, and the dynamic property of the whole vehicle is improved; and meanwhile, switching of multiple working modes such as pure electricity, hybrid power, engine direct drive and range extension can be achieved, and the use performance of a hybrid vehicle type is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicles, and in particular relates to a multi-gear hybrid power system and a vehicle. Background Art

[0002] Hybrid vehicles have the advantages of both fuel and pure electric vehicles, and have better performance in environmental protection and driving range. Existing hybrid vehicles usually switch power modes through the structure of the transmission. Due to the power diversion, the structure of this hybrid transmission is prone to insufficient power when working. Utility Model Content

[0003] The embodiments of the utility model provide a multi-gear hybrid power system and a vehicle, aiming to achieve high torque output in different working modes and solve the problem of insufficient working power of hybrid vehicles.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a multi-speed hybrid power system, including: an engine, a drive motor, a planetary system, a multi-speed gear set and an output gear set; the engine is connected to the planetary system through a first input shaft, and the planetary system is connected to the multi-speed gear set through a second input shaft; the multi-speed gear set is connected to the output gear set through an intermediate transmission shaft, and the output gear set is connected to an output shaft; the drive motor is connected to the planetary system through a hollow shaft, and the hollow shaft is emptied on the second input shaft, and the first gear gear set in the multi-speed gear set is connected to the hollow shaft; the first input shaft, the planetary system, the hollow shaft and the second input shaft are coaxially arranged.

[0005] In combination with the first aspect, in an achievable manner, the planetary system includes a ring gear, a planet carrier, a planetary gear and a sun gear, the ring gear is connected to the first input shaft, the planet carrier is connected to the second input shaft, the ring gear is engaged or disconnected with the connecting hub of the planet carrier through a first clutch, and the connecting hub is engaged or disconnected with the outer shell through a first brake; the planetary gear is connected to the planet carrier, the planetary gear is meshed with the ring gear, the sun gear is meshed with the planetary gear, and the sun gear is coaxially connected to the hollow shaft.

[0006] In combination with the first aspect, in one achievable manner, the multi-gear gear set includes the first gear gear set, the second gear gear set, the third gear gear set and the fourth gear gear set, the first gear gear set being engaged or disconnected with the intermediate transfer shaft through a first synchronizer; the second gear gear set being engaged or disconnected with the intermediate transfer shaft through a second synchronizer; the third gear gear set being engaged or disconnected with the intermediate transfer shaft through a third synchronizer; and the fourth gear gear set being engaged or disconnected with the intermediate transfer shaft through a fourth synchronizer.

[0007] In combination with the first aspect, in an achievable manner, the first gear gear set includes a first driving wheel and a first driven wheel that are meshed and connected, the first driving wheel is coaxially connected to the hollow shaft; the first driven wheel is loosely mounted on the intermediate transmission shaft, and the first synchronizer is connected between the first driven wheel and the intermediate transmission shaft.

[0008] In combination with the first aspect, in one achievable manner, the second gear gear set includes a second driving wheel and a second driven wheel that are meshed and connected, the second driving wheel is coaxially connected to the second input shaft; the second driven wheel is loosely mounted on the intermediate transmission shaft, and the second synchronizer is connected between the second driven wheel and the intermediate transmission shaft.

[0009] In combination with the first aspect, in one achievable manner, the third gear gear set includes a third driving wheel and a third driven wheel that are meshed and connected, and the third driving wheel is coaxially connected to the second input shaft; the third driven wheel is loosely mounted on the intermediate transmission shaft, and the third synchronizer is connected between the third driven wheel and the intermediate transmission shaft.

[0010] In combination with the first aspect, in one achievable manner, the fourth gear gear set includes a fourth driving wheel and a fourth driven wheel meshingly connected to each other, the fourth driving wheel is coaxially connected to the second input shaft; the fourth driven wheel is loosely mounted on the intermediate transmission shaft, and the fourth synchronizer is connected between the fourth driven wheel and the intermediate transmission shaft.

[0011] In combination with the first aspect, in one achievable manner, the output gear set includes an output driving wheel and an output driven wheel that are meshed and connected, the output driving wheel is coaxially connected to the intermediate transmission shaft; the output driven wheel is connected to the output shaft.

[0012] In combination with the first aspect, in one practicable manner, the drive motor is connected to the hollow shaft via a motor bracket.

[0013] Compared with the prior art, the multi-gear hybrid system provided by the utility model has the following beneficial effects: in the hybrid mode, the power of the engine is transmitted to the planetary system via the first input shaft, the power of the drive motor is transmitted to the sun gear via the hollow shaft, and then to the planetary system via the sun gear. The power of the engine and the drive motor is fused steplessly via the planetary system and transmitted to the second input shaft, thereby realizing the gear switching of the multi-gear gear set. This structure of the hybrid of the multi-gear gear set and the planetary system can provide a high-torque power output through the fusion of the power of the engine and the drive motor, and realizes the switching of different gears by changing the access of different gear sets, thereby realizing high-torque output in different working modes. It is suitable for off-road platforms with long-term high-power and high-torque escape requirements, and solves the problem of insufficient power of hybrid vehicles.

[0014] When the drive motor directly drives the hollow shaft and drives the first gear gear set to transfer power to the output shaft through the output gear set, the pure electric working mode can be realized; when the engine power drives the hollow shaft and the second input shaft to rotate through the planetary system, the sun gear, the drive motor charging mode can be realized; when the engine power is transmitted to the second input shaft through the planetary system, and then transmitted to the multi-gear gear set through the second input shaft, the engine direct drive mode is realized. Therefore, the system can not only achieve hybrid high-power and high-torque output, but also realize the switching of pure electric, hybrid, engine direct drive four-gear, and extended range modes, improving the performance of hybrid vehicles.

[0015] In a second aspect, an embodiment of the utility model further provides a vehicle, comprising the multi-speed hybrid power system.

[0016] The vehicle provided by the embodiment of the utility model adopts this multi-speed hybrid power system, which can achieve high torque output in different working modes and improve the power of the whole vehicle; at the same time, it can also realize switching of pure electric, hybrid, engine direct drive four-speed, and extended-range modes, thereby improving the performance of hybrid vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the transmission structure of a multi-gear hybrid power system provided by an embodiment of the utility model;

[0018] Description of reference numerals:

[0019] 1. Engine; 2. First input shaft; 3. Planetary system; 31. Ring gear; 32. Planet carrier; 33. Planetary gear; 34. Connecting hub; 35. Sun gear; 4. Driving motor; 5. Motor bracket; 6. Hollow shaft; 7. First gear gear set; 71. First driving wheel; 72. First driven wheel; 8. Second gear gear set; 81. Second driven wheel; 82. Second driving wheel; 9. Third gear gear set; 91. Third driven wheel; 92. Third driving wheel; 10. Fourth gear gear set; 101. Fourth driven wheel; 102. Fourth driving wheel; 11. Output gear set; 111. Output driving wheel; 112. Output driven wheel; 12. Intermediate transmission shaft; 13. Second input shaft; 14. Output shaft; C1. First clutch; B1. First brake; S1. First synchronizer; S2. Second synchronizer; S3. Third synchronizer; S4. Fourth synchronizer. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0022] See also Figure 1 The multi-gear hybrid power system provided by the utility model is now described. The multi-gear hybrid power system comprises: an engine 1, a driving motor 4, a planetary system 3, a multi-gear gear set and an output gear set 11; the engine 1 is connected to the planetary system 3 through a first input shaft 2, and the planetary system 3 is connected to the multi-gear gear set through a second input shaft 13; the multi-gear gear set is connected to the output gear set 11 through an intermediate transmission shaft 12, and the output gear set 11 is connected to an output shaft 14; the driving motor 4 is connected to the planetary system 3 through a hollow shaft 6, and the hollow shaft 6 is loosely sleeved on the second input shaft 13, and the first gear gear set 7 in the multi-gear gear set is connected to the hollow shaft 6; the first input shaft 2, the planetary system 3, the hollow shaft 6 and the second input shaft 13 are coaxially arranged.

[0023] The multi-gear hybrid power system provided by the utility model has an engine 1 connected to a first input shaft 2, and a drive motor 4 connected to a hollow shaft 6. The power transmission path of the engine 1 is transmitted from the first input shaft 2 to the ring gear 31 and then divided into two transmission paths: path one is transmitted to the second input shaft 13 via the planetary carrier 32, and path two is transmitted to the hollow shaft 6 via the sun gear 35; the power of the drive motor 4 is also transmitted in two paths, path one can be directly transmitted to the hollow shaft 6, and path two is transmitted to the sun gear 35 via the hollow shaft 6, and then transmitted to the second input shaft 13 via the planetary carrier 32. The present application can obtain a larger transmission ratio through the combination of the planetary system 3 and the multi-gear gear set, so that a larger torque can be output, and a long-term high-power and high-torque power output can be achieved under various working conditions, which is suitable for use on off-road platforms with escape requirements.

[0024] In the hybrid mode, the power of the engine 1 is transmitted to the planetary system 3 via the first input shaft 2, the power of the drive motor 4 is transmitted to the sun gear 35 via the hollow shaft 6, and then transmitted to the planetary system 3 via the sun gear 35. The power of the engine 1 and the drive motor 4 is integrated through the planetary system 3 to achieve stepless power and transmitted to the second input shaft 13, thereby realizing the gear switching of the multi-gear gear set. This hybrid structure of the multi-gear gear set and the planetary system 3 can provide high-torque power output through the integration of the power of the engine 1 and the drive motor 4, and realize the switching of different gears by changing the access of different gear sets, thereby realizing high-torque output in different working modes. It is suitable for off-road platforms with long-term high-power and high-torque escape requirements, and solves the problem of insufficient power of hybrid vehicles.

[0025] When the driving motor 4 directly drives the hollow shaft 6 and drives the first gear gear set 7 to transfer power to the output shaft 14 through the output gear set 11, the pure electric working mode can be realized; when the power of the engine 1 drives the hollow shaft 6 and the second input shaft 13 to rotate through the planetary system 3 and the sun gear 35, the charging mode of the driving motor 4 can be realized; when the power of the engine 1 is transferred to the second input shaft 13 through the planetary system 3, and then transferred to the multi-gear gear set through the second input shaft 13, the direct drive mode of the engine 1 is realized. Therefore, the system can not only realize the hybrid high-power and high-torque output, but also realize the switching of pure electric, hybrid, engine 1 direct drive four-gear, and extended range modes, thereby improving the performance of hybrid vehicles.

[0026] The first input shaft 2, the planetary system 3, the hollow shaft 6 and the second input shaft 13 are arranged coaxially. This arrangement has a simple structure, a compact layout, is easy to implement, has high transmission efficiency, and is conducive to the improvement of output torque.

[0027] In some embodiments, see Figure 1As shown, the planetary system 3 includes a ring gear 31, a planet carrier 32, a planetary gear 33 and a sun gear 35. The ring gear 31 is connected to the first input shaft 2, the planet carrier 32 is directly connected to the second input shaft 13, the ring gear 31 is engaged or disconnected with the connecting hub 34 of the planet carrier 32 through the first clutch C1, and the connecting hub 34 is engaged or disconnected with the outer shell through the first brake B1; the planetary gear 33 is connected to the planet carrier 32, the planetary gear 33 is meshed with the ring gear 31, the sun gear 35 is meshed with the planetary gear 33, and the sun gear 35 is coaxially connected to the hollow shaft 6. The first clutch C1 realizes the engagement or disconnection of the connecting hub 34 with the ring gear 31, and the first brake B1 realizes the engagement or disconnection of the connecting hub 34 with the outer shell, thereby realizing the switching of different working modes and the switching of different power drives.

[0028] Alternatively, the first brake B1 may be replaced by a synchronizer or a clutch.

[0029] The first input shaft 2 , the ring gear 31 , the sun gear 35 , the hollow shaft 6 and the second input shaft 13 are arranged coaxially.

[0030] In some embodiments, see Figure 1 As shown, the multi-gear gear set includes a first gear gear set 7, a second gear gear set 8, a third gear gear set 9 and a fourth gear gear set 10. The first gear gear set 7 is engaged or disconnected with the intermediate transfer shaft 12 through the first synchronizer S1; the second gear gear set 8 is engaged or disconnected with the intermediate transfer shaft 12 through the second synchronizer S2; the third gear gear set 9 is engaged or disconnected with the intermediate transfer shaft 12 through the third synchronizer S3; and the fourth gear gear set 10 is engaged or disconnected with the intermediate transfer shaft 12 through the fourth synchronizer S4, thereby realizing switching between different gears.

[0031] In some embodiments, see Figure 1 As shown, the first gear gear set 7 includes a first driving wheel 71 and a first driven wheel 72 that are meshed and connected, the first driving wheel 71 is coaxially connected to the hollow shaft 6; the first driven wheel 72 is loosely sleeved on the intermediate transmission shaft 12, and the first synchronizer S1 is connected between the first driven wheel 72 and the intermediate transmission shaft 12. The first synchronizer S1 is used to achieve synchronous movement or disconnection between the first driven wheel 72 and the intermediate transmission shaft 12 after the first driven wheel 72 is engaged or disconnected, and the first driving wheel 71 can be directly driven by the driving motor 4.

[0032] In some embodiments, see Figure 1 As shown, the second gear gear set 8 includes a second driving wheel 82 and a second driven wheel 81 that are meshed and connected, the second driving wheel 82 is coaxially connected to the second input shaft 13; the second driven wheel 81 is loosely sleeved on the intermediate transmission shaft 12, and the second synchronizer S2 is connected between the second driven wheel 81 and the intermediate transmission shaft 12. The second synchronizer S2 is used to achieve synchronous movement or disconnection between the second driven wheel 81 and the intermediate transmission shaft 12 after engagement.

[0033] In some embodiments, see Figure 1 As shown, the third gear gear set 9 includes a third driving wheel 92 and a third driven wheel 91 that are meshed and connected, the third driving wheel 92 is coaxially connected to the second input shaft 13; the third driven wheel 91 is loosely sleeved on the intermediate transmission shaft 12, and the third synchronizer S3 is connected between the third driven wheel 91 and the intermediate transmission shaft 12. The third synchronizer S3 is used to achieve synchronous movement or disconnection between the third driven wheel 91 and the intermediate transmission shaft 12 after engagement.

[0034] In some embodiments, see Figure 1 As shown, the fourth gear gear set 10 includes a fourth driving wheel 102 and a fourth driven wheel 101 that are meshed and connected, the fourth driving wheel 102 is coaxially connected to the second input shaft 13; the fourth driven wheel 101 is loosely sleeved on the intermediate transmission shaft 12, and the fourth synchronizer S4 is connected between the fourth driven wheel 101 and the intermediate transmission shaft 12. The fourth synchronizer S4 is used to achieve synchronous movement or disconnection between the fourth driven wheel 101 and the intermediate transmission shaft 12 after engagement.

[0035] In the multi-gear gear set, the second driving wheel 82, the third driving wheel 92 and the fourth driving wheel 102 are all coaxially mounted on the second input shaft 13, and the first driven wheel 72, the second driven wheel 81, the third driven wheel 91, the fourth driven wheel 101 and the output driving wheel 111 are coaxially mounted on the intermediate transmission shaft 12. This coaxial arrangement has a compact structure, can reduce energy loss, and is also conducive to improving transmission efficiency and output torque.

[0036] In some embodiments, see Figure 1 As shown, the output gear set 11 includes an output driving wheel 111 and an output driven wheel 112 which are meshed and connected. The output driving wheel 111 is coaxially connected to the intermediate transmission shaft 12; the output driven wheel 112 is connected to the output shaft 14.

[0037] In some embodiments, see Figure 1 As shown, the driving motor 4 is connected to the hollow shaft 6 via a motor bracket 5. The motor bracket 5 provides reliable support for the driving motor 4.

[0038] The multi-speed hybrid system provided in this application can realize switching of 11 working modes, including pure electric, ECVT hybrid, engine 1 direct drive, extended-range power and other working modes. It can realize power switching of multiple modes and multiple gears, meet the long-term high-power and high-torque power output under various working conditions, and is suitable for use on off-road platforms.

[0039] See also Figure 1 As shown, the working principles of various working modes are as follows:

[0040] At the same time, for the sake of simplicity in description, in this article, the first clutch is replaced by C1, the first brake is replaced by B1, the first synchronizer is replaced by S1, the second synchronizer is replaced by S2, the third synchronizer is replaced by S3, and the fourth synchronizer is replaced by S4.

[0041] EV pure electric mode: S1 is engaged, C1, B1, S2, S3, and S4 are all disconnected, and the drive motor 4 transmits power to the output shaft 14 through the hollow shaft 6 via the first gear gear set 7 and the output gear set 11, and the drive motor 4 rotates forward and reverse to achieve single-gear forward or reverse movement in EV mode. At this time, the engine 1 does not work.

[0042] ECVT hybrid mode forward gear: C1, B1, S1 are disconnected, the engine 1 and the drive motor 4 are both working, and the three gears in the ECVT forward mode can be switched by engaging S2, S3, and S4. The details are as follows:

[0043] The power of the engine 1 acts on the ring gear 31 through the first input shaft 2, and the power of the drive motor 4 acts on the sun gear 35 through the hollow shaft 6. The power of the engine 1 and the power of the drive motor 4 are output to the planetary carrier 32 through the planetary system 3 to realize stepless power fusion, and the planetary carrier 32 drives the second input shaft 13 to rotate, and the second input shaft 13 drives the second driving wheel 82, the third driving wheel 92 and the fourth driving wheel 102 to rotate. The second driven wheel 81, the third driven wheel 91 and the fourth driven wheel 101 are respectively engaged or disconnected with the intermediate transmission shaft 12 through S2, S3 and S4, thereby realizing the switching of 3 gears, and driving the output shaft 14 to rotate through the output gear set 11 to realize the 3-gear forward mode under the ECVT mode.

[0044] Engine 1 direct drive mode - forward gear: C1 and S1 are engaged, S1, S2, S3, and S4 are disconnected, and the engine 1 is connected to the planetary carrier 32 via the first output shaft 14 through the ring gear 31 to transmit power to the sun gear 35, thereby driving the hollow shaft 6 to operate, and transmitting power to the output shaft 14 via the first gear gear set 7 and the output gear set 11, realizing the first gear forward in the direct drive mode of the engine 1, and the drive motor 4 does not work.

[0045] C1 is engaged, B1 and S1 are disconnected, and the engagement of S2, S3, and S4 can realize the switching of the three gears in the direct drive forward mode of the engine 1, as follows: the engine 1 is connected to the connecting hub 34 through the first output shaft 14 through the ring gear 31 to drive the planetary carrier 32 to rotate, and then drives the second input shaft 13 to rotate, and drives the second driving wheel 82, the third driving wheel 92 and the fourth driving wheel 102 to rotate. The second driven wheel 81, the third driven wheel 91 and the fourth driven wheel 101 are respectively engaged or disconnected with the intermediate transmission shaft 12 through S2, S3, and S4, thereby realizing the switching of the three gears, and driving the output shaft 14 to rotate through the output gear set 11 to realize the three-gear forward mode in the direct drive mode of the engine 1.

[0046] Engine 1 direct drive mode - reverse gear: B1 and S1 are engaged, C1, S2, S3, and S4 are disconnected, and the reverse gear of the direct drive mode of the engine 1 can be realized. Specifically, B1 is engaged to fix the planet carrier 32, the power of the engine 1 is input through the ring gear 31, and the sun gear 35 is output in the reverse direction, and the power is transmitted to the output shaft 14 through the first gear gear set 7 and the output gear set 11, realizing the reverse gear of the direct drive mode of the engine 1.

[0047] Range-extended mode: C1, B1, S1, S2, S3, and S4 are all disconnected, and the range-extended charging mode can be realized. Specifically, the power of the engine 1 drives the planetary gear 33 and the planetary carrier 32 to rotate through the first input shaft 2 via the ring gear 31, and the planetary carrier 32 meshes with the sun gear 35 to drive the sun gear 35 to rotate, and the sun gear 35 drives the hollow shaft 6 to rotate, so as to charge the drive motor 4.

[0048] The shifting logic of each working mode of the multi-speed hybrid system provided in this application is shown in Table 1.

[0049] Table 1 Shift logic of each working mode - Working - Not working

[0050] Serial number Working Mode ICE GM C1 B1 S1 S2 S3 S4 Gear 1 EV1 F1 2 EV2 R 3 ECVT1 F1 4 ECVT2 F2 5 ECVT3 F3 6 ICE1 F1 7 ICE2 F2 8 ICE3 F3 9 ICE4 F4 10 ICER R 11 Extended Range /

[0051] In Table 1, EV represents the pure electric working mode, F represents the forward gear, and R represents the reverse gear; ECVT represents the hybrid mode, ICE represents the engine direct drive mode, and there are 11 working modes in total; GM represents the drive motor.

[0052] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0053] Based on the same inventive concept, an embodiment of the present application also provides a vehicle, comprising the multi-speed hybrid power system.

[0054] The vehicle provided by the embodiment of the utility model adopts this multi-speed hybrid power system, which achieves high torque output in different working modes and improves the power of the whole vehicle; at the same time, it can also realize switching of pure electric, hybrid, engine direct drive four-speed, and extended-range modes, thereby improving the performance of hybrid vehicles.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-speed hybrid power system, characterized in that: include: An engine (1), a drive motor (4), a planetary system (3), a multi-speed gear set and an output gear set (11); The engine (1) is connected to the planetary system (3) via a first input shaft (2), and the planetary system (3) is connected to the multi-speed gear set via a second input shaft (13); the multi-speed gear set is connected to the output gear set (11) via an intermediate transmission shaft (12), and the output gear set (11) is connected to an output shaft (14); the drive motor (4) is connected to the planetary system (3) via a hollow shaft (6), and the hollow shaft (6) is loosely sleeved on the second input shaft (13), and the first gear gear set (7) in the multi-speed gear set is connected to the hollow shaft (6); the first input shaft (2), the planetary system (3), the hollow shaft (6) and the second input shaft (13) are coaxially arranged.

2. The multi-speed hybrid power system according to claim 1, characterized in that: The planetary system (3) comprises a ring gear (31), a planet carrier (32), a planetary gear (33) and a sun gear (35); the ring gear (31) is connected to the first input shaft (2), the planet carrier (32) is connected to the second input shaft (13), the ring gear (31) is engaged with or disconnected from a connecting hub (34) of the planet carrier (32) via a first clutch (C1), and the connecting hub (34) is engaged with or disconnected from an outer housing via a first brake (B1); the planetary gear (33) is connected to the planet carrier (32), the planetary gear (33) is meshed with the ring gear (31), the sun gear (35) is meshed with the planetary gear (33), and the sun gear (35) is coaxially connected to the hollow shaft (6).

3. The multi-speed hybrid power system according to claim 1, characterized in that: The multi-gear gear set includes the first gear gear set (7), the second gear gear set (8), the third gear gear set (9) and the fourth gear gear set (10); the first gear gear set (7) is engaged with or disconnected from the intermediate transfer shaft (12) through a first synchronizer (S1); the second gear gear set (8) is engaged with or disconnected from the intermediate transfer shaft (12) through a second synchronizer (S2); the third gear gear set (9) is engaged with or disconnected from the intermediate transfer shaft (12) through a third synchronizer (S3); and the fourth gear gear set (10) is engaged with or disconnected from the intermediate transfer shaft (12) through a fourth synchronizer (S4).

4. The multi-speed hybrid power system according to claim 3, characterized in that: The first gear gear set (7) comprises a first driving wheel (71) and a first driven wheel (72) which are meshed and connected, the first driving wheel (71) being coaxially connected to the hollow shaft (6); the first driven wheel (72) being loosely sleeved on the intermediate transmission shaft (12), and the first synchronizer (S1) being connected between the first driven wheel (72) and the intermediate transmission shaft (12).

5. The multi-speed hybrid power system according to claim 3, characterized in that: The second gear gear set (8) comprises a second driving wheel (82) and a second driven wheel (81) which are meshed and connected, the second driving wheel (82) being coaxially connected to the second input shaft (13); the second driven wheel (81) being loosely sleeved on the intermediate transmission shaft (12), and the second synchronizer (S2) being connected between the second driven wheel (81) and the intermediate transmission shaft (12).

6. The multi-speed hybrid power system according to claim 3, characterized in that: The third gear gear set (9) comprises a third driving wheel (92) and a third driven wheel (91) which are meshed and connected, the third driving wheel (92) being coaxially connected to the second input shaft (13); the third driven wheel (91) being loosely sleeved on the intermediate transmission shaft (12), and the third synchronizer (S3) being connected between the third driven wheel (91) and the intermediate transmission shaft (12).

7. The multi-speed hybrid power system according to claim 3, characterized in that: The fourth gear gear set (10) comprises a fourth driving wheel (102) and a fourth driven wheel (101) which are meshed and connected, the fourth driving wheel (102) being coaxially connected to the second input shaft (13); the fourth driven wheel (101) being loosely mounted on the intermediate transmission shaft (12), and the fourth synchronizer (S4) being connected between the fourth driven wheel (101) and the intermediate transmission shaft (12).

8. The multi-speed hybrid power system according to claim 1, characterized in that: The output gear set (11) comprises an output driving wheel (111) and an output driven wheel (112) which are meshed and connected, the output driving wheel (111) being coaxially connected to the intermediate transmission shaft (12); and the output driven wheel (112) being connected to the output shaft (14).

9. The multi-speed hybrid power system according to claim 1, characterized in that: The driving motor (4) is connected to the hollow shaft (6) via a motor bracket (5).

10. A vehicle, characterized in that: It comprises a multi-speed hybrid power system as described in any one of claims 1 to 9.

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