Coaxial dual-motor power dividing hybrid power system structure

Abstract

The utility model relates to a coaxial double-motor power dividing hybrid power system structure. The transmission comprises a wheel output shaft, an engine input shaft, a GM motor, a TM driving motor, a GM motor sun gear, a GM motor planet gear, a TM motor sun gear, a TM motor planet gear and a gear ring. The engine input shaft is connected with the GM motor planet wheel through a planet carrier, one end of the GM motor planet wheel is meshed with the gear ring, the other end of the GM motor planet wheel is meshed with the GM motor sun wheel, and the GM motor sun wheel is connected with the GM motor through a GM motor shaft; the TM driving motor is connected with the TM motor sun wheel through a TM motor shaft, the TM motor sun wheel is meshed with one end of the TM motor planet wheel, and the other end of the TM motor planet wheel is meshed with the gear ring; and the gear ring is connected with the wheel output shaft.

Description

Technical Field

[0001] The utility model relates to an automobile speed change mechanism, in particular to a coaxial dual-motor power split hybrid system structure. Background Art

[0002] The existing automobile transmissions are mainly of the following types, including manual transmissions, automatic transmissions, semi-automatic transmissions, dual-clutch transmissions, continuously variable transmissions, infinitely variable mechanical continuously variable transmissions, and hybrid transmissions.

[0003] For example, the utility model patent with patent application number 202210956721.4 discloses a dual-motor dual-planetary gearbox with power splitting, which mainly includes: a housing, an auxiliary motor, a drive motor, an input shaft, an output shaft, a dual planetary gear, a dual brake and other components. Among them: a section of the input shaft is connected to the engine, and the auxiliary motor shaft of the auxiliary motor is sleeved on the input shaft; the drive motor shaft of the drive motor is sleeved on the output shaft; the first driven disc of the dual brake and the second driven disc of the dual brake are respectively provided on both sides of the dual brake disc, the first driven disc of the dual brake is fixed on the auxiliary motor shaft, and the second driven disc of the dual brake is fixed to the left planet carrier. The dual brakes are respectively connected to the left sun gear lock and the left planet carrier for engine locking and auxiliary motor locking. When the engine is locked, the dual motor pure electric drive condition can be met, and when the auxiliary lock is in the state of direct engine drive. However, in order to ensure that the output power of the engine can be fully used for driving the vehicle under high-speed driving conditions and improve system efficiency, a dual brake system is set. During high-speed direct drive, the planetary gear is only used as a reduction gear with a fixed reduction ratio. The engine and the wheels are connected through a fixed gear ratio. Usually, the three degrees of freedom of the planetary gear can be freely adjusted to achieve any speed ratio. However, this utility model does not fully utilize the advantages of the three degrees of freedom of the planetary gear, but instead brings the following defects:

[0004] 1. Double brakes will increase system losses. When both brakes are turned on at the same time or only one brake is turned on, there will be relative friction when the open brakes are working, thereby increasing system heating and losses.

[0005] 2. Dual brakes will increase the risk of system failure. The brakes contain friction pairs, hydraulic components, and various solenoid valves and sensors, which have a certain risk of failure.

[0006] 3. Dual brakes will increase system cost and volume. Utility Model Content

[0007] The purpose of the utility model is to overcome the defects in the prior art and provide a coaxial dual-motor power split hybrid system structure with simpler structure and control, lower cost, better reliability and smaller size.

[0008] The utility model is implemented as follows: a coaxial dual-motor power split hybrid system structure, including a wheel output shaft, an engine input shaft, a GM motor, a TM drive motor, a GM motor sun gear, a GM motor planetary gear, a TM motor sun gear, a TM motor planetary gear and a ring gear; the engine input shaft is connected to the GM motor planetary gear through a planet carrier, one end of the GM motor planetary gear is meshed with the ring gear, the other end of the GM motor planetary gear is meshed with the GM motor sun gear, and the GM motor sun gear is connected to the GM motor through the GM motor shaft;

[0009] The TM drive motor is connected to the TM motor sun gear through the TM motor shaft, the TM motor sun gear is meshed with one end of the TM motor planetary gear, and the other end of the TM motor planetary gear is meshed with the ring gear; the ring gear is connected to the wheel output shaft.

[0010] The GM motor shaft and the GM motor sun gear are hard-connected; the engine input shaft and the planet carrier are hard-connected.

[0011] The ring gear is hard-connected to the wheel output shaft; the TM motor shaft is hard-connected to the TM motor sun gear.

[0012] Including power split working link, hybrid working link, pure electric working link, reverse working link and brake energy recovery working link;

[0013] The power splitting working link is as follows: the engine input shaft transmits the power from the engine to the GM motor planetary gear, the GM motor planetary gear transmits part of the power to the GM motor sun gear, the GM motor shaft and the GM motor in sequence, and the GM motor planetary gear transmits the remaining power to the wheel output shaft and the wheel in sequence through the ring gear;

[0014] The hybrid working chain is as follows: the engine input shaft transmits the power from the engine to the GM motor planetary gear, the GM motor planetary gear transmits part of the power to the GM motor sun gear, the GM motor shaft and the GM motor in sequence, and the GM motor planetary gear transmits the remaining power to the ring gear; the TM drive motor works and transmits the power to the TM motor sun gear, the TM motor planetary gear and the ring gear in sequence through the TM motor shaft; the ring gear combines the power from the two places and directly transmits the power to the wheel through the wheel output shaft;

[0015] The pure electric working link is: the TM drive motor works and transmits power to the TM motor sun gear, TM motor planetary gear, gear ring, wheel output shaft and wheel in sequence through the TM motor shaft;

[0016] The reverse working link is: the TM drive motor reverses, and the power is output to the ring gear through the TM motor sun gear and the TM motor planetary gear, and the ring gear transmits the power to the wheel through the wheel output shaft.

[0017] The braking energy recovery working link is: when the vehicle brakes, the TM drive motor changes from a driving discharge state to a charging state, converting the vehicle's driving kinetic energy into electrical energy and storing it in the battery on the vehicle.

[0018] The beneficial effects of the utility model are: the brake system is cancelled, and the planetary gear set composed of the GM motor sun gear, GM motor planetary gear, TM motor sun gear, TM motor planetary gear and ring gear is in a floating state to form a power split structure, so that the three degrees of freedom of the planetary gear set are respectively connected to the engine, GM motor, TM drive motor and wheels, and the torque and speed of the automobile engine are controlled and adjusted through the power split structure to achieve stepless speed change, so that the engine is always in the best economic area, which can be unaffected by the working conditions of the automobile, and greatly improve the fuel economy of the automobile. The rate split structure is full of gears inside, has no wearing parts, good reliability and low maintenance cost.

[0019] The utility model does not need a clutch and a transmission, and can achieve stepless speed change, which greatly saves space and production costs. After the brake system is eliminated, the structure and control of the hybrid box assembly are simpler, the cost is lower, the failure rate of the system is reduced, the reliability is better, and the volume is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model.

[0021] Among them: 1. Wheel output shaft; 2. Engine input shaft; 3. GM motor; 4. TM drive motor; 5. GM motor sun gear; 6. GM motor planetary gear; 7. TM motor sun gear; 8. TM motor planetary gear; 9. Ring gear; 10. Planetary carrier; 11. GM motor shaft; 12. TM motor shaft; 13. Engine; 14. Wheel. DETAILED DESCRIPTION

[0022] according to Figure 1The utility model is a coaxial dual-motor power split hybrid system structure, including a wheel output shaft 1, an engine input shaft 2, a GM motor 3, a TM drive motor 4, a GM motor sun gear 5, a GM motor planetary gear 6, a TM motor sun gear 7, a TM motor planetary gear 8 and a ring gear 9; the engine input shaft 2 is connected to the GM motor planetary gear 6 through a planet carrier 10, one end of the GM motor planetary gear 6 is meshed with the ring gear 9, and the other end of the GM motor planetary gear 6 is meshed with the GM motor sun gear 5, and the GM motor sun gear 5 is connected to the GM motor 3 through the GM motor shaft 11.

[0023] The TM drive motor 4 is connected to the TM motor sun gear 7 via the TM motor shaft 12 . The TM motor sun gear 7 is meshed with one end of the TM motor planetary gear 8 . The other end of the TM motor planetary gear 8 is meshed with the ring gear 9 . The ring gear 9 is connected to the wheel output shaft 1 .

[0024] The GM motor shaft 11 and the GM motor sun gear 5 are hard-connected; the engine input shaft 2 and the planet carrier 10 are hard-connected.

[0025] The ring gear 9 and the wheel output shaft 1 are hard-connected; the TM motor shaft 12 and the TM motor sun gear 7 are hard-connected.

[0026] The utility model forms a power split structure by placing the planetary gear set consisting of the GM motor sun gear, the GM motor planetary gear, the TM motor sun gear, the TM motor planetary gear and the ring gear in a floating state.

[0027] It includes power split working link, hybrid working link, pure electric working link, reversing working link and braking energy recovery working link.

[0028] The power splitting working link is as follows: the engine input shaft 2 transmits the power from the engine 13 to the GM motor planetary gear 6, the GM motor planetary gear 6 transmits part of the power to the GM motor sun gear 5, the GM motor shaft 11 and the GM motor 3 in sequence, and the GM motor planetary gear 6 transmits the remaining power to the wheel output shaft 1 and the wheel 14 in sequence through the gear ring 9. Through the power splitting structure, the output power is reasonably distributed to the GM motor 3 for power generation and driving the wheel 14 for travel according to the different speeds and torques of the engine 13.

[0029] The hybrid working link is as follows: the engine input shaft 2 transmits the power from the engine 13 to the GM motor planetary gear 6, the GM motor planetary gear 6 transmits part of the power to the GM motor sun gear 5, the GM motor shaft 11 and the GM motor 3 in sequence, and the GM motor planetary gear 6 transmits the remaining power to the ring gear 9; the TM drive motor 4 works and transmits the power to the TM motor sun gear 7, the TM motor planetary gear 8 and the ring gear 9 in sequence through the TM motor shaft 12; the ring gear 9 combines the power from the two places and directly transmits the output to the wheel 14 through the wheel output shaft 1.

[0030] The pure electric working link is: the TM drive motor 4 works and transmits power to the TM motor sun gear 7, the TM motor planetary gear 8, the ring gear 9, the wheel output shaft 1 and the wheel 14 in sequence through the TM motor shaft 12.

[0031] The reverse working link is: the TM drive motor 4 reverses, outputs power to the ring gear 9 through the TM motor sun gear 7 and the TM motor planetary gear 8, and the ring gear 9 transmits the power to the wheel 14 through the wheel output shaft 1.

[0032] The braking energy recovery working link is: when the vehicle brakes, the TM drive motor 4 changes from a driving discharge state to a charging state, converts the vehicle's driving kinetic energy into electrical energy and stores it in the battery on the vehicle, thereby realizing the braking recovery function.

[0033] The utility model has the following states at different vehicle speeds: at low speeds, the engine 13 speed and torque are partially decoupled from the wheels 14, and the engine 13 can be independent of the needs of the wheels 14, so that it always works in a region with high fuel economy. The power shunt structure allows the GM motor 3 to absorb a larger portion of the engine power, and the GM motor 3 generates electricity to store the electric power in the power battery or provide it to the TM drive motor 4, which drives the wheels 14 in parallel with the remaining mechanical power of the engine 13. As the vehicle speed increases, the engine 13 is more suitable for mechanical transmission at this time, and the electric power absorbed by the GM motor 3 will gradually decrease until it reaches 0. At this time, the power of the engine 13 will be fully transmitted to the wheels 14 through a mechanical path. This point is called a power shunt mechanical point, and direct engine drive can be achieved at this time.

Claims

1. A coaxial dual-motor power split hybrid system structure, Features: The invention comprises a wheel output shaft (1), an engine input shaft (2), a GM motor (3), a TM drive motor (4), a GM motor sun gear (5), a GM motor planetary gear (6), a TM motor sun gear (7), a TM motor planetary gear (8) and a ring gear (9); the engine input shaft (2) is connected to the GM motor planetary gear (6) via a planet carrier (10); one end of the GM motor planetary gear (6) is meshed with the ring gear (9); the other end of the GM motor planetary gear (6) is meshed with the GM motor sun gear (5); and the GM motor sun gear (5) is connected to the GM motor (3) via a GM motor shaft (11); The TM drive motor (4) is connected to the TM motor sun gear (7) via a TM motor shaft (12); the TM motor sun gear (7) is meshed with one end of the TM motor planetary gear (8); the other end of the TM motor planetary gear (8) is meshed with the ring gear (9); and the ring gear (9) is connected to the wheel output shaft (1).

2. A coaxial dual-motor power split hybrid system structure according to claim 1, Features: The GM motor shaft (11) and the GM motor sun gear (5) are hard-connected; and the engine input shaft (2) and the planet carrier (10) are hard-connected.

3. The coaxial dual-motor power split hybrid system structure according to claim 1, Features: The ring gear (9) and the wheel output shaft (1) are hard-connected; the TM motor shaft (12) and the TM motor sun gear (7) are hard-connected.

4. The coaxial dual-motor power split hybrid system structure according to claim 1, Features: Including power split working link, hybrid working link, pure electric working link, reverse working link and brake energy recovery working link; The power splitting working link is as follows: the engine input shaft (2) transmits the power from the engine (13) to the GM motor planetary gear (6); the GM motor planetary gear (6) transmits a part of the power to the GM motor sun gear (5), the GM motor shaft (11) and the GM motor (3) in sequence; the GM motor planetary gear (6) transmits the remaining part of the power to the wheel output shaft (1) and the wheel (14) in sequence through the ring gear (9); The hybrid working chain is as follows: the engine input shaft (2) transmits power from the engine (13) to the GM motor planetary gear (6); the GM motor planetary gear (6) transmits part of the power to the GM motor sun gear (5), the GM motor shaft (11) and the GM motor (3) in sequence; the GM motor planetary gear (6) transmits the remaining power to the ring gear (9); the TM drive motor (4) works and transmits power to the TM motor sun gear (7), the TM motor planetary gear (8) and the ring gear (9) in sequence through the TM motor shaft (12); the ring gear (9) combines the power from the two places and directly transmits the power to the wheel (14) through the wheel output shaft (1); The pure electric working link is as follows: the TM drive motor (4) works and transmits power in sequence to the TM motor sun gear (7), the TM motor planetary gear (8), the ring gear (9), the wheel output shaft (1) and the wheel (14) through the TM motor shaft (12); The reverse working link is as follows: the TM drive motor (4) is reversed, and power is output to the ring gear (9) through the TM motor sun gear (7) and the TM motor planetary gear (8), and the ring gear (9) transmits power to the wheel (14) through the wheel output shaft (1).

5. The coaxial dual-motor power split hybrid system structure according to claim 4, Features: The braking energy recovery working link is as follows: when the vehicle brakes, the TM drive motor (4) changes from a driving discharge state to a charging state, converting the kinetic energy of the vehicle into electrical energy for storage in a battery on the vehicle.

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