Two-gear hybrid power gearbox with U-shaped stator, double motors and double planet rows

Abstract

The invention discloses a two-gear hybrid power gearbox of a U-shaped stator double-motor double-planet-row structure, and belongs to the technical field of hybrid power gearboxes, the two-gear hybrid power gearbox comprises an engine and a gearbox shaft arranged below the engine, and one side of the engine is provided with a set of power generation motors EM1 and a set of driving motors EM2; rotors of the power generation motor EM1 and the driving motor EM2 are arranged in a coaxial nesting mode and share one U-shaped motor stator, an output shaft of the driving motor EM2 is connected with a second planet row planet carrier C2, and the two motors (the driving motor EM2 and the power generation motor EM1) share one stator and are coaxially arranged, so that the axial size of the whole gearbox is greatly shortened, and the transmission efficiency is improved. Meanwhile, a double-planet-row and gear-shifting structure is adopted, the speed ratio range is widened, and the requirements for the rotating speed change range and the torque of the motor are lowered; the transmission efficiency of the gearbox is higher, the integration degree is higher, layout is easy, parts are reduced, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of hybrid power transmissions, and in particular to a two-speed hybrid power transmission with a U-shaped stator, dual motors and dual planetary gearboxes. Background Art

[0002] As the core component of the powertrain system of hybrid electric vehicles (HEV, PHEV), the hybrid transmission can improve the fuel economy and optimize the power of the vehicle under multiple working conditions by controlling the power coupling of the engine and the motor in real time. With the rapid growth of the global car ownership, the pressure on energy, environment, safety and other aspects is increasing, forcing the global automobile energy conservation and electrification process to accelerate. In the face of industrial bottlenecks such as the range anxiety of pure electric vehicles, the imperfect construction of charging infrastructure, and the difficulty of achieving major technological breakthroughs in power batteries in the short and medium term, pure electric vehicles are currently unable to meet the current market demand for automobile use. Ordinary hybrid electric vehicles (HEV) and plug-in hybrid electric vehicles (PHEV) can not only meet the current domestic and foreign emission energy conservation target requirements, but also meet the current market conditions. They have been widely promoted and applied worldwide. In the medium and long term, passenger cars using hybrid power will still be important models in the domestic and foreign automobile consumption field, with great market prospects. Vehicles represented by Toyota's hybrid car PRIUS use a power-split architecture with a single planetary gearbox and dual motors. The two motors in this architecture are arranged on both sides of the single planetary gearbox. The motor system has low integration, uses a single planetary gearbox, has a low reduction ratio, and has high requirements for the motor's speed range and torque, thus placing extremely high demands on various performance indicators of the entire motor system.

[0003] This provides a more compact, lower-cost, more efficient dual-planetary gearbox and a highly integrated dual-motor shiftable hybrid transmission. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a two-speed hybrid transmission with a U-shaped stator, dual-motor and dual-planetary gearbox configuration, which overcomes the shortcomings of the prior art and provides a dual-planetary gearbox with a more compact structure, lower cost and higher transmission efficiency, as well as a highly integrated dual-motor shiftable hybrid transmission.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a two-speed hybrid transmission with a U-shaped stator, dual-motor and dual-planetary gear configuration, comprising an engine and a transmission shaft arranged below the engine, wherein a group of generator motors EM1 and a group of drive motors EM2 are arranged on one side of the engine, and share a motor stator, the output shaft of the drive motor EM2 is connected to the second planetary gear carrier C2, and the output shaft is loosely sleeved on the shaft 1, the engine is connected to the first planetary gear carrier C1 through the input shaft, the first planetary gear sun gear S1 is connected to the rotor of the generator motor EM1 through the hollow shaft 1, the first planetary gear carrier C1 and the second planetary gear carrier C2 share a ring gear R, the second planetary gear sun gear S2 is connected to the gear G1 through the shaft 2, and the transmission shaft is arranged with a gear G2, a gear G3 and a drive gear G4.

[0006] By adopting the above technical solution, when in use, the two motors (drive motor EM2 and generator motor EM1) are coaxially arranged to share a stator, so that the axial size of the entire gearbox is greatly shortened. At the same time, a double planetary gear and a shiftable configuration are adopted, which increases the speed ratio range and reduces the requirements for the speed variation range and torque of the motor; the gearbox has higher transmission efficiency, higher integration, easier layout, fewer parts, and lower costs.

[0007] As a preferred technical solution of the present invention, the motor stator is divided into an outer stator and an inner stator. The outer stator is paired with the rotor of the drive motor EM2, and the inner stator is paired with the rotor of the generator motor EM1. The inner and outer stators are fixedly connected by a mechanical structure.

[0008] By adopting the above technical solution, the design of the motor stator brings many advantages in the hybrid transmission, such as compact structure, high integration, high transmission efficiency, low cost, flexible scalability and thermal management optimization.

[0009] As a preferred technical solution of the present invention, one side of the ring gear R is connected to a brake B1, one side of the shaft 1 is connected to a brake B2, and one side of the shaft 2 is connected to a brake B3.

[0010] By adopting the above technical solution, the brakes B1, B2, and B3 respectively connected through the ring gear R, shaft 1, and shaft 2 play an important role in the hybrid transmission. They not only improve the flexibility and transmission efficiency of the system, but also enhance the stability and reliability of the system, optimize the power distribution, realize complex functions, and reduce costs and maintenance difficulties.

[0011] As a preferred technical solution of the present invention, the rotors of the generator motor EM1 and the drive motor EM2 are arranged in a coaxial nested manner, and the motor stators are U-shaped.

[0012] By adopting the above technical solution, the coaxial nested design means that the rotors of the two motors share the same shaft, thereby greatly reducing the space occupied by the motor system. At the same time, the coaxial arrangement of a stator greatly shortens the axial dimension of the entire gearbox.

[0013] As a preferred technical solution of the present invention, the ring gear R has internal teeth and external teeth, the internal teeth mesh with the first planetary gear P1 and the second planetary gear P2, and the external teeth mesh with the gear G3.

[0014] By adopting the above technical solution, the first planetary gear P1 and the second planetary gear P2 and the external gear meshing gear G3 can be respectively meshed and driven by the arrangement of the internal teeth and the external teeth.

[0015] As a preferred technical solution of the present invention, the gear G2 meshes with the gear G1, the gear G3 meshes with the ring gear R, a synchronizer SY is provided between the gears G2 and G3, and the driving gear G4 meshes with the differential large ring gear.

[0016] By adopting the above technical solution, the meshing relationship among the gear G2, the gear G1, the gear G3, the gear G4, the differential and the ring gear R is facilitated to facilitate the linkage interaction between the various components.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a coaxial arrangement in which two motors (drive motor EM2 and generator motor EM1) share a stator, thereby greatly shortening the axial dimension of the entire gearbox. At the same time, a double planetary gearbox and a shiftable configuration are adopted, which increases the speed ratio range and reduces the requirements on the speed variation range and torque of the motor; thus, the gearbox has higher transmission efficiency, higher integration, easier layout, fewer parts, and lower costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view schematic diagram of the present invention.

[0019] Description of reference numerals: 1. Engine; 2. Input shaft; 3. First planetary gear sun gear S1; 4. First planetary gear carrier C1; 5. First planetary gear P1; 6. Ring gear R; 7. Brake B1; 8. Shaft 1; 9. Brake B2; 10. Second planetary gear sun gear S2; 11. Second planetary gear P2; 12. Second planetary gear carrier C2; 13. Motor stator; 14. Drive motor EM2; 15. Generator motor EM1; 16. Brake B3; 17. Shaft 2; 18. Gear G1; 19. Gear G2; 20. Synchronizer SY; 21. Gear G3; 22. Gear G4; 23. Gearbox shaft. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 A two-speed hybrid transmission with a U-shaped stator dual-motor dual-planetary gear configuration includes an engine 1 and a transmission shaft 23 arranged below the engine 1. A group of generator motors EM1 15 and a group of drive motors EM2 14 are arranged on one side of the engine 1, and they share a motor stator 13. The output shaft of the drive motor EM2 14 is connected to the second planetary gear carrier C2 12, and the output shaft is sleeved on the shaft 1 8. The engine 1 is connected to the first planetary gear carrier C1 4 through the input shaft 2. The first planetary gear sun gear S1 3 is connected to the rotor of the generator motor EM1 15 through the hollow shaft 1 8. The first planetary gear carrier C1 4 and the second planetary gear carrier C2 12 share a gear ring R6. The second planetary gear sun gear S2 10 is connected to the gear G1 18 through the shaft 2 17. The gear gear G2 19, the gear G3 21 and the drive gear G4 22 are arranged on the transmission shaft 23. The two motor drive motors EM2 14 and the generator motor EM1 The coaxial arrangement of the motor stator 13 and the gearbox 15 greatly shortens the axial dimension of the entire gearbox. At the same time, the double planetary gearbox and the gear-shifting configuration improve the speed ratio range and reduce the requirements on the speed range and torque of the motor. The gearbox has higher transmission efficiency, higher integration, easier layout, fewer parts and lower costs.

[0022] For details, see Figure 1The rotors of the generator motor EM1 15 and the drive motor EM2 14 are arranged in a coaxial nested manner, and the motor stator 13 is set in a U-shape. The coaxial nested design means that the rotors of the two motors share the same shaft, thereby greatly reducing the space occupied by the motor system. At the same time, the coaxial arrangement of a motor stator 13 greatly shortens the axial size of the entire gearbox. The ring gear R6 has internal teeth and external teeth. The internal teeth are meshed with the first planetary row planetary gear P1 5 and the second planetary row planetary gear P2 11, and the external teeth are meshed with the gear G3 21. The internal teeth and the external teeth can respectively mesh and drive the first planetary row planetary gear P1 5 and the second planetary row planetary gear P2 11 and the external teeth meshing gear G3 21, wherein the gear G2 19 is meshed with the gear G1 18, and the gear G3 21 is meshed with the ring gear R6. A synchronizer SY20 is provided between the gear G2 19 and the gear G3 21, and the driving gear G4 22 is meshed with a differential large ring gear, and the meshing relationship between gear G2 19, gear G1 18, gear G3 21, gear G4 22, the differential and ring gear R6 facilitates the linkage interaction between the various components.

[0023] For details, see Figure 1 The motor stator 13 is divided into an outer stator and an inner stator. The outer stator is paired with the rotor of the drive motor EM214, and the inner stator is paired with the rotor of the generator motor EM1 15. The inner and outer stators are fixedly connected by a mechanical structure. This design of the motor stator 13 brings many advantages in the hybrid power transmission, such as compact structure, high integration, high transmission efficiency, low cost, flexible and scalable, and thermal management optimization.

[0024] For details, see Figure 1 One side of the ring gear R6 is connected to the brake B1, one side of the shaft 18 is connected to the brake B29, and one side of the shaft 217 is connected to the brake B316. The brakes B1, B2, and B3 connected through the ring gear R6, shaft 18, and shaft 217 respectively play an important role in the hybrid transmission. They not only improve the flexibility and transmission efficiency of the system, but also enhance the stability and reliability of the system, optimize the power distribution, realize complex functions, and reduce costs and maintenance difficulties.

[0025] Working principle: Pure electric mode: engine 1 does not work, brake B1 7 locks ring gear R6, generator motor EM1 15 does not work, drive motor EM2 14 works to drive the second planetary gear carrier C2 12, and drives the second planetary gear sun gear S2 10. The power flows through shaft 2 17 to gear G1 18 to gear G2 19 to drive gear G4 22, and synchronizer SY20 acts to the differential assembly to drive the vehicle. The power used by the drive motor comes from the vehicle battery.

[0026] Series mode: the engine 1 works, driving the first planetary gear carrier C1 4 to rotate, the brake B1 7 locks the ring gear R6, the power flows to the first planetary gear sun gear S1 3, and drives the rotor of the generator motor EM1 15 to work through the shaft 1 8, and the generator motor EM1 15 generates electricity to charge the battery or directly provide power to the drive motor EM2 14.

[0027] Parallel mode: the engine 1 and the drive motor EM2 14 work at the same time, they jointly drive the ring gear R6 to the gear G321, and at the same time the drive motor EM2 14 drives the second planetary row sun gear S2 10, through the shaft 2 17 to the gear G1 18 and the gear G219. At this time, the synchronizer SY20 can select a suitable gear to drive the wheels, and the excess power drives the generator motor EM1 15 to generate electricity through the first planetary row sun gear S1 3.

[0028] Parking power generation: When the vehicle is stopped, the engine 1 is working, the brake B1 7 locks the ring gear R6, and the first planetary row sun gear S1 3 drives the generator motor EM1 15 to work and charge the vehicle battery.

[0029] Engine 1 start and stop: The engine 1 is started and driven by the generator motor EM1 15 under the brake B1 7 locking the ring gear R6.

[0030] Braking energy recovery: Engine 1 is not working, the wheels drive the differential, through gear G4 22 to gear G2 19 and gear G1 18 synchronizer SY20 to the second planetary gear sun gear S2 10, driving the drive motor EM2 14 to work and generate electricity.

[0031] Engine 1 direct drive: Engine 1 is working, the two motor drive motors EM2 14 and the generator motor EM1 15 are not working, the brake B2 9 locks the first planetary gear sun gear S1 3, the engine 1 drives the ring gear R6 to the gear 3, the synchronizer SY20 acts to the gear G4 22, and drives the wheels through the differential.

[0032] Reversing: Engine 1 does not work, brake B3 16 locks shaft 2 17, drive motor EM2 14 reverses, drives ring gear R6 to gear G3 21 to gear G4 22, and drives the wheels through the differential.

[0033] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A two-speed hybrid transmission with a U-shaped stator, dual motor and dual planetary gearbox configuration, comprising an engine (1) and a transmission shaft (23) arranged below the engine (1), characterized in that: A group of generator motors EM1 (15) and a group of drive motors EM2 (14) are arranged on one side of the engine (1), and they share a motor stator (13); the output shaft of the drive motor EM2 (14) is connected to the second planetary gear carrier C2 (12), and the output shaft is loosely sleeved on the shaft 1 (8); the engine (1) is connected to the first planetary gear carrier C1 (4) through the input shaft (2); the first planetary gear sun gear S1 (3) is connected to the rotor of the generator motor EM1 (15) through the hollow shaft 1 (8); the first planetary gear carrier C1 (4) and the second planetary gear carrier C2 (12) share a ring gear R (6); the second planetary gear sun gear S2 (10) is connected to the gear G1 (18) through the shaft 2 (17); and the gearbox shaft (23) is arranged with a gear G2 (19), a gear G3 (21) and a drive gear G4 (22).

2. A two-speed hybrid transmission with a U-shaped stator, dual motors and dual planetary gearbox according to claim 1, characterized in that: The motor stator (13) is divided into two parts: an outer stator and an inner stator. The outer stator is paired with the rotor of the drive motor EM2 (14), and the inner stator is paired with the rotor of the generator motor EM1 (15). The inner and outer stators are fixedly connected by a mechanical structure.

3. A two-speed hybrid transmission with a U-shaped stator, dual motors and dual planetary gearbox according to claim 1, characterized in that: One side of the gear ring R (6) is connected to a brake B1, one side of the shaft 1 (8) is connected to a brake B2 (9), and one side of the shaft 2 (17) is connected to a brake B3 (16).

4. A two-speed hybrid transmission with a U-shaped stator, dual motors and dual planetary gearbox according to claim 1, characterized in that: The rotors of the generator motor EM1 (15) and the drive motor EM2 (14) are arranged in a coaxial nested manner, and the motor stator (13) is arranged in a U shape.

5. The two-speed hybrid transmission with a U-shaped stator, dual motors and dual planetary gearbox according to claim 1, characterized in that: The ring gear R (6) has internal teeth and external teeth, the internal teeth meshing with the first planetary gear P1 (5) and the second planetary gear P2 (11), and the external teeth meshing with the gear G3 (21).

6. A two-speed hybrid transmission with a U-shaped stator, dual motors and dual planetary gearbox according to claim 1, characterized in that: The gear G2 (19) meshes with the gear G1 (18), the gear G3 (21) meshes with the ring gear R (6), a synchronizer SY (20) is provided between the gear G2 (19) and the gear G3 (21), and the driving gear G4 (22) meshes with the differential large ring gear.

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