A dual-motor power coupling drive system based on a planetary gear assembly

Abstract

The present invention relates to a dual-motor power coupling drive system based on a planetary gear assembly, comprising a first motor, a second motor, an intermediate gear set I, an intermediate gear set II, a synchronizer, an input shaft I, an input shaft II, a double-row planetary gear assembly, a brake, and a power output assembly; the power drive system of the present invention is capable of achieving a total of five drive modes. The existence of these five working modes enables the motor to operate more in a high-efficiency range while meeting driving requirements, thereby further improving the efficiency of the entire drive system.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicle drive technology, and in particular to a dual-motor power coupling drive system based on a planetary gear assembly. Background Art

[0002] With the rapid development of the automotive industry, people are placing increasingly higher demands on vehicle performance, economy, and ride comfort. Furthermore, with increasing energy consumption, the market for electric vehicles is growing year by year. Electric vehicles use electricity as their power source, which is clean and environmentally friendly, quiet when driving, and has good acceleration performance. However, the limited energy storage capacity of batteries results in a short driving range. To address this issue, both battery and battery management system optimization can be used to increase battery energy density and the efficiency of the vehicle's drive system needs to be improved.

[0003] Currently, most electric vehicle drive systems utilize a single motor coupled with a fixed-ratio reducer. However, this system fails to meet both power requirements and economical efficiency. Consequently, an increasing number of manufacturers are researching dual-motor drive systems coupled with multi-speed transmissions. Summary of the Invention

[0004] The present invention aims to provide a dual-motor power-coupled drive system based on a planetary gear assembly, which improves the power and economy of existing electric vehicle drive systems while reducing motor size compared to single-motor drive systems. This system utilizes dual motors with a double-row planetary gear assembly, providing multiple drive modes, compact design, and high overall efficiency.

[0005] The technical solution adopted in the present invention is as follows:

[0006] The present invention proposes a dual-motor power coupling drive system based on a planetary gear assembly, comprising a first motor, a second motor, an intermediate gear set I, an intermediate gear set II, a synchronizer, an input shaft I, an input shaft II, a double-row planetary gear assembly, a brake and a power output assembly; the synchronizer is arranged on the output shaft of the first motor; one end of the intermediate gear set I and the intermediate gear set II are respectively coaxially arranged on the outside of the output shaft of the first motor, and are respectively connected to both sides of the synchronizer, and the first motor can be engaged with the intermediate gear set I and the intermediate gear set II respectively through the synchronizer; the other end of the intermediate gear set I is coaxially connected to Connected to input shaft II; one end of the input shaft II is connected to the second motor, and the other end is coaxially connected to the inner ring of the double-row planetary gear assembly; the other end of the intermediate gear set II is connected to one end of the input shaft I, and the other end of the input shaft I is coaxially connected to the outer ring of the double-row planetary gear assembly; the brake is arranged inside the double-row planetary gear assembly; one end of the power output assembly is coaxially connected to the output end of the double-row planetary gear assembly; the double-row planetary gear assembly transmits the power of the first motor and the second motor to the power output assembly, and the power output assembly transmits the power output of the double-row planetary gear assembly to the half-axle to drive the entire vehicle.

[0007] Furthermore, the double-row planetary gear assembly includes a ring gear, a front sun gear, a front planetary gear, a front planetary gear carrier, a rear sun gear, a rear planetary gear and a rear planetary gear carrier; the front sun gear and the rear sun gear are coaxially arranged; the front planetary gears are correspondingly meshed with the outer ring of the front sun gear; the rear planetary gears are correspondingly meshed with the outer ring of the rear sun gear; the front planetary gear carrier is coaxially arranged on the front end face of the front planetary gear; the rear planetary gear carrier is coaxially arranged on the rear end face of the rear planetary gear; the brake is provided on the front planetary gear carrier for braking it; the ring gear is coaxially arranged on the front side of the front planetary gear carrier, and its inner ring is respectively meshed with the front planetary gear and the rear planetary gear; the other end of the intermediate gear group II and the ring gear are coaxially connected to the two ends of the input shaft I; the other end of the input shaft II is coaxially connected to the front sun gear.

[0008] Furthermore, the power output assembly includes a final reducer input gear, a final reducer output gear and a differential; the output end of the rear planetary gear carrier is engaged with the final reducer input gear; the final reducer input gear is engaged with the final reducer output gear; the final reducer output gear is connected to the differential to transmit power to the differential, and then output to the half-axles and wheels to drive the car.

[0009] Furthermore, the drive system also includes a planetary gear set housing, the double-row planetary gear assembly, the intermediate gear set I and the intermediate gear set II are all located inside the planetary gear set housing, and the brake is also installed inside the planetary gear set housing.

[0010] Furthermore, the drive system includes the following five drive modes:

[0011] First motor single drive mode: The first motor is powered on, the synchronizer is engaged with the intermediate gear set II, the brake brakes the front planetary gear carrier, the second motor is not working, and the entire system is in single motor working mode;

[0012] Second motor single drive mode: The second motor is powered on, the synchronizer is not engaged with any gear, the brake brakes the front planetary gear carrier, the first motor is not working, and the entire system is in single motor working mode;

[0013] Dual-motor torque coupling drive mode 1: Both the first and second motors are working, the synchronizer engages the intermediate gear set I, and the brake applies the brake to the front planetary gear carrier. The entire system is in dual-motor torque coupling working mode.

[0014] Dual-motor torque coupling drive mode 2: Both the first and second motors are working, the synchronizer engages the intermediate gear set II, and the brake applies the brake to the front planetary gear carrier. The entire system is in dual-motor torque coupling working mode.

[0015] Dual-motor speed coupling driving mode: The first motor and the second motor are both working, the synchronizer is engaged with the intermediate gear set II, the brake is not working, and the entire system is in the dual-motor speed coupling working mode.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Providing two torque coupling modes, the drive system has better acceleration and climbing performance, and stronger power. At the same time, it can also achieve speed coupling, which can improve the vehicle's economy when driving at high speed.

[0018] 2. The power coupling device selected is a Simpson planetary gear mechanism. Compared with the parallel axis structure, the planetary gear mechanism has a compact structure, uses fewer components and has a lower cost.

[0019] 3. This drive system does not require a clutch or synchronizer, and only needs to control the brake to switch modes. The control is relatively simple, and the switching process can be achieved without power interruption, which can improve the shifting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a dual-motor power coupling drive system based on a planetary gear assembly proposed in the present invention;

[0021] Figure 2 Schematic diagram of power transmission of the drive system mode 1 of the present invention;

[0022] Figure 3 Schematic diagram of power transmission of mode 2 of the drive system of the present invention;

[0023] Figure 4 Schematic diagram of power transmission in torque coupling mode 1 of the drive system of the present invention;

[0024] Figure 5 Schematic diagram of power transmission in torque coupling mode 2 and speed coupling mode of the drive system of the present invention.

[0025] Among them, the figure marks are: 1-first electric motor; 2-intermediate gear set I; 3-synchronizer; 4-intermediate gear set II; 5-ring gear; 6-front planetary gear; 7-rear planetary gear; 8-rear planetary gear carrier; 9-main reducer input gear; 10-differential; 11-main reducer output gear; 12-rear sun gear; 13-front sun gear; 14-front planetary gear carrier; 15-brake; 16-input shaft I; 17-input shaft II; 18-second electric motor. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] It should be noted that, in the description of the present invention, the terms "up", "down", "top", "bottom", "one side", "the other side", "left", "right", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0028] like Figure 1As shown, the specific structure of an embodiment of a dual-motor power coupling drive system based on a planetary gear assembly proposed by the present invention is given. The drive system includes a first motor 1, an intermediate gear set I2, a synchronizer 3, an intermediate gear set II4, a double-row planetary gear assembly, a power output assembly, a brake 15, an input shaft I16, an input shaft II17, and a second motor 18. The synchronizer 3 is arranged on the output shaft of the first motor 1; the upper ends of the intermediate gear set I2 and the intermediate gear set II4 are coaxially arranged on the outside of the output shaft of the first motor 1, and are respectively connected to the two sides of the synchronizer 3. The first motor 1 can be respectively engaged with the intermediate gear set I2 and the intermediate gear set II4 through the synchronizer 3; the lower end of the intermediate gear set I2 is coaxially connected to the input shaft II17; one end of the input shaft II17 is connected to the second motor 18, and the other end is coaxially connected to the inner ring of the double-row planetary gear assembly; the lower end of the intermediate gear set II4 is connected to one end of the input shaft I16, and the input shaft I16 The other end is coaxially connected to the outer ring of the double-row planetary gear assembly; the first motor 1 can transmit power to the input shaft II 17 by engaging with the intermediate gear set I 2, and can also transmit power to the input shaft I 16 by engaging with the intermediate gear set II 4; the brake 15 is arranged inside the double-row planetary gear assembly; one end of the power output assembly is coaxially connected to the output end of the double-row planetary gear assembly; the double-row planetary gear assembly transmits the power of the first motor 1 and the second motor 18 to the power output assembly, and the power output assembly transmits the power output of the double-row planetary gear assembly to the half-axle to drive the entire vehicle.

[0029] In this embodiment, the double-row planetary gear assembly includes a ring gear 5, a front row planetary gear 6, a rear row planetary gear 7, a rear planetary gear carrier 8, a rear row sun gear 12, a front row sun gear 13 and a front planetary gear carrier 14; the front row sun gear and the rear row sun gear are coaxially arranged; the inner ring of the front row planetary gear 6 is meshed with the outer ring of the front row sun gear 13; the inner ring of the rear row planetary gear 7 is meshed with the outer ring of the rear row sun gear 12; the front planetary gear carrier 14 is coaxially arranged on the front end surface of the front row planetary gear 6; the rear row planetary gear The planet carrier 8 is coaxially arranged on the rear end face of the rear planetary gear 7; the brake 15 is arranged on the front planetary gear carrier 14 for braking it; the ring gear 5 is coaxially arranged on the front side of the front planetary gear carrier 14, and its inner ring is respectively engaged with the front planetary gear 6 and the rear planetary gear 7; the lower end of the intermediate gear set II4 and the ring gear 5 are coaxially connected to the two ends of the input shaft I16 respectively; one end of the input shaft II17 is connected to the output end of the second motor 18, and the other end is coaxially fixed to the front sun gear 13 and the rear sun gear 12 in sequence.

[0030] The power output assembly includes a final reducer input gear 9, a differential 10 and a final reducer output gear 11; the output end of the rear planetary gear carrier 8 is engaged with the final reducer input gear 9; the final reducer input gear 9 is engaged with the final reducer output gear 11; the final reducer output gear 11 is connected to the differential 10 to transmit power to the differential 10, and then output to the half-axles and wheels to drive the car.

[0031] A planetary gear set housing is also provided outside the drive system, wherein the double-row planetary gear assembly, intermediate gear set I2 and intermediate gear set II4 are all arranged inside the planetary gear set housing, and the brake 15 is also installed at a corresponding position inside the planetary gear set housing.

[0032] The vehicle controller receives signals from onboard sensors to determine when the vehicle should switch modes and the mode to which it should switch, and controls the mode switching. The drive system of the present invention includes the following five drive modes:

[0033] First motor single drive mode: Figure 2 As shown, first motor 1 is energized, synchronizer 3 engages intermediate gear set II 4, brake 15 applies pressure to front planetary gear carrier 14, and second motor 18 is deactivated, placing the entire system in single-motor operation. When first motor 1 is operating, it transmits power via input shaft I 16 to ring gear 5. This power then passes through the double-row planetary gear assembly, where brake 15 applies pressure to front planetary gear carrier 14. The power is then output to rear planetary gear carrier 8, which is then connected to final drive input gear 9, transmitting the power to final drive output gear 11.

[0034] Second motor single drive mode: Figure 3 As shown, second motor 18 is energized, synchronizer 3 is not engaged with any gear set, brake 15 is braking front planetary gear carrier 14, and first motor 1 is not operating, with the entire system in single-motor mode. When second motor 18 is operating, it transmits power via input shaft II 17 to front sun gear 13 and rear sun gear 12. This power then passes through the double-row planetary gear assembly, brake 15 braking front planetary gear carrier 14, and output at rear planetary gear carrier 8. Rear planetary gear carrier 8 is connected to final drive input gear 9, transmitting the power to final drive output gear 11.

[0035] Dual motor torque coupling drive mode 1: Figure 4As shown, the first motor 1 and the second motor 18 are both working, the synchronizer 3 engages the intermediate gear set Ⅰ2, the brake 15 brakes the front planetary gear carrier 14, and the entire system is in a dual-motor torque coupling working mode; when the first motor 1 and the second motor 18 are working, the power is input to the front sun gear 13 and the rear sun gear 12 through the input shaft Ⅰ16, the brake 15 brakes the front planetary gear carrier 14, and outputs it at the rear planetary gear carrier 8; the rear planetary gear carrier 8 is connected to the main reducer input gear 9, and transmits the power to the main reducer output gear 11.

[0036] Dual motor torque coupling drive mode 2: Figure 5 As shown, the first motor 1 and the second motor 18 are both working, the synchronizer 3 engages the intermediate gear set II4, the brake 15 brakes the front planetary gear carrier 14, and the entire system is in a dual-motor torque coupling working mode; when the first motor 1 and the second motor 18 are working, the power is input to the ring gear 5, the front sun gear 13 and the rear sun gear 12 through the input shaft I4 and the input shaft II2, the brake 15 brakes the front planetary gear carrier 14, and outputs it at the rear planetary gear carrier 8; the rear planetary gear carrier 8 is connected to the main reducer input gear 9, and transmits the power to the main reducer output gear 11.

[0037] Dual-motor speed-coupling drive mode: Both the first motor 1 and the second motor 18 are operating, synchronizer 3 engages intermediate gear set II 4, and brake 15 is deactivated. The entire system is in dual-motor speed-coupling mode. The difference between dual-motor torque-coupling drive mode 1 and speed-coupling drive mode 1 lies in whether brake 15 is activated or not. However, the power flow in both modes is the same, so the power flow in the dual-motor speed-coupling drive mode will not be further described.

[0038] Table 1 Working Mode Table

[0039]

[0040] Matters not fully described in the present invention are known in the art.

[0041] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A dual-motor power coupling drive system based on a planetary gear assembly, characterized by: The drive system includes a first electric motor, a second electric motor, an intermediate gear set I, an intermediate gear set II, a synchronizer, an input shaft I, an input shaft II, a double-row planetary gear assembly, a brake, and a power take-off assembly. The synchronizer is disposed on the output shaft of the first electric motor. One end of the intermediate gear set I and the intermediate gear set II are coaxially disposed outside the output shaft of the first electric motor and are connected to opposite sides of the synchronizer. The first electric motor is engaged with the intermediate gear set I and the intermediate gear set II, respectively, through the synchronizer. The other end of the intermediate gear set I is coaxially connected to the input shaft II. One end of the input shaft II is connected to the second electric motor and the other end is coaxially connected to the inner ring of the double-row planetary gear assembly. The other end of the intermediate gear set II is connected to one end of the input shaft I, and the other end of the input shaft I is coaxially connected to the outer ring of the double-row planetary gear assembly. The brake is disposed inside the double-row planetary gear assembly. One end of the power take-off assembly is coaxially connected to the output end of the double-row planetary gear assembly. The double-row planetary gear assembly transmits power from the first and second electric motors to the power take-off assembly, and the power take-off assembly transmits power output from the double-row planetary gear assembly to the axle shafts to drive the vehicle. The double-row planetary gear assembly includes a ring gear, a front sun gear, a front planetary gear, a front planetary gear carrier, a rear sun gear, a rear planetary gear, and a rear planetary gear carrier; the front sun gear and the rear sun gear are coaxially arranged; the front planetary gears are correspondingly meshed with the outer ring of the front sun gear; the rear planetary gears are correspondingly meshed with the outer ring of the rear sun gear; the front planetary gear carrier is coaxially arranged on the front end face of the front planetary gear; the rear planetary gear carrier is coaxially arranged on the rear end face of the rear planetary gear; The drive system includes the following five drive modes: First motor single drive mode: The first motor is powered on, the synchronizer is engaged with the intermediate gear set II, the brake brakes the front planetary gear carrier, the second motor is not working, and the entire system is in single motor working mode; Second motor single drive mode: The second motor is powered on, the synchronizer is not engaged with any gear, the brake brakes the front planetary gear carrier, the first motor is not working, and the entire system is in single motor working mode; Dual-motor torque coupling drive mode 1: The first and second motors are both working, the synchronizer engages the intermediate gear set I, the brake applies the brake to the front planetary gear carrier, and the entire system is in dual-motor torque coupling working mode; Dual-motor torque coupling drive mode 2: Both the first and second motors are working, the synchronizer engages the intermediate gear set II, and the brake applies the brake to the front planetary gear carrier. The entire system is in dual-motor torque coupling working mode. Dual-motor speed coupling driving mode: The first motor and the second motor are both working, the synchronizer is engaged with the intermediate gear set II, the brake is not working, and the entire system is in the dual-motor speed coupling working mode.

2. The dual-motor power coupling drive system based on a planetary gear assembly according to claim 1, characterized in that: The brake is arranged on the front planetary gear carrier for braking it; the ring gear is coaxially arranged on the front side of the front planetary gear carrier, and its inner ring is respectively engaged with the front planetary gears and the rear planetary gears; the other end of the intermediate gear set II and the ring gear are respectively coaxially connected to the two ends of the input shaft I; the other end of the input shaft II is coaxially connected to the front sun gear and the rear sun gear in sequence.

3. The dual-motor power coupling drive system based on a planetary gear assembly according to claim 2, characterized in that: The power output assembly includes a final reducer input gear, a final reducer output gear and a differential; the output end of the rear planetary gear carrier is meshed with the final reducer input gear; The main reducer input gear is meshed with the main reducer output gear; The output gear of the main reducer is connected to the differential, transmitting power to the differential, and then outputting it to the half-axles and wheels to drive the car.

4. The dual-motor power coupling drive system based on a planetary gear assembly according to claim 1, characterized in that: The drive system further includes a planetary gear set housing, the double-row planetary gear assembly, the intermediate gear set I and the intermediate gear set II are all located inside the planetary gear set housing, and the brake is also installed inside the planetary gear set housing.

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