A dual-motor coupling drive system and new energy electric vehicle

Abstract

The present invention discloses a dual-motor coupling drive system and a new energy electric vehicle. The dual-motor coupling drive system comprises: a main drive motor, comprising a first rotating shaft, two ends of the first rotating shaft form a front axle extension end and a rear axle extension end, and the front axle extension end is used to connect a load; an auxiliary drive motor, comprising a second front axle extension end; a hydraulic torque converter, used to connect the second front axle extension end of the auxiliary drive motor and the rear axle extension end of the main drive motor; under normal circumstances, the load is driven by the main drive motor, and when the output torque of the main drive motor is insufficient, the auxiliary drive motor is coupled to the main drive motor through the hydraulic torque converter, and the torque of the auxiliary drive motor is transmitted to the main drive motor, so that the torque of the main drive motor and the auxiliary drive motor are superimposed to meet the torque output of the overall drive system; the dual-motor coupling drive system has a simple structure, and the auxiliary drive motor and the main drive motor are coupled through the hydraulic torque converter, so that the reliability is high and the noise is low.

Description

Technical field:

[0001] The invention relates to a dual-motor coupling drive system and a new energy electric vehicle. Background technology:

[0002] At present, there are three types of drive motor systems used in pure electric vehicles: single motor drive, dual motor gear coupling drive and dual motor electronically controlled clutch coupling. The working principle of single motor drive is as follows: Figure 1 As shown in the figure, the single motor drive can only adapt to one working condition and cannot take into account multiple working conditions due to the limitation of the motor's own performance. Although the speed change mechanism can solve the problem of adapting to multiple working conditions, the speed change mechanism needs to be assisted by electronic control, the structure is complex, and the comfort is low. The working principle of the dual motor gear coupling drive is as follows Figure 2 As shown in the figure, multiple sets of gears form an AMT gearbox, and the two motors drive the load after being coupled through the AMT gearbox. The working principle of the dual-motor electronically controlled clutch coupling drive is as follows Figure 3 As shown, it includes an integrated starter generator (ISG generator) and a traction motor (TM motor). The ISG generator is controlled by the ISG motor controller, and the TM motor is controlled by the TM motor controller. When the car starts, the ISG motor drives the TM motor. Although the dual-motor gear coupling drive and the dual-motor electronically controlled clutch coupling can meet a variety of working conditions, they both have their own shortcomings. The gear transmission structure of the dual-motor gear coupling drive is complex, the reliability is reduced, and the high-speed noise is large; the dual-motor electronically controlled clutch coupling drive requires a matching electronic control device to control the engagement state, and the reliability is low. Summary of the invention:

[0003] The purpose of the present invention is to provide a dual-motor coupled drive system and a new energy electric vehicle, which can solve the problems of complex structure and low reliability of the dual-motor drive system in the prior art.

[0004] The purpose of the present invention is achieved through the following technical solutions.

[0005] The first object of the present invention is to provide a dual-motor coupling drive system, characterized in that it includes:

[0006] A main drive motor, comprising a first motor housing, a first stator assembly, a first rotor assembly and a first rotating shaft, wherein two ends of the first rotating shaft extend out of the first motor housing to form a front axle extension end and a rear axle extension end, respectively, and the front axle extension end is used to connect a load;

[0007] An auxiliary drive motor, comprising a second motor housing, a second stator assembly, a second rotor assembly and a second rotating shaft, wherein the front end of the second rotating shaft extends out of the second motor housing to form a second front shaft extension end;

[0008] a hydraulic torque converter, used to connect the second front axle extension end of the auxiliary drive motor and the rear axle extension end of the main drive motor;

[0009] Under normal circumstances, the load is driven by the main drive motor. When the output torque of the main drive motor is insufficient, the auxiliary drive motor is coupled to the main drive motor through the torque converter, and the torque of the auxiliary drive motor is transmitted to the main drive motor, so that the torque of the main drive motor and the auxiliary drive motor are superimposed to meet the torque output of the overall drive system.

[0010] The above also includes a motor controller, which controls the operation of the main drive motor and the auxiliary drive motor.

[0011] The first rotating shaft of the main driving motor and the second rotating shaft of the auxiliary driving motor are arranged on the same axis.

[0012] The above-mentioned torque converter includes a torque converter housing, a locking clutch, a one-way clutch, a pump wheel, a guide wheel, a turbine and hydraulic oil. The second front axle extension end of the auxiliary drive motor drives the torque converter housing. The outer edge of the torque converter housing is installed and connected to the outer edge of the pump wheel to form a pump chamber. The guide wheel is mounted on the one-way clutch. The locking clutch, turbine, guide wheel and hydraulic oil are located inside the pump chamber. The rear axle extension end of the main drive motor extends into the pump chamber through the through hole in the middle of the pump wheel. The locking clutch, turbine and guide wheel are installed on the rear axle extension end from left to right in sequence. The locking clutch, turbine, guide wheel and pump wheel are arranged along the rear axle extension end from left to right.

[0013] The pump wheel mentioned above comprises a hub and a plurality of first blades arranged at intervals on the inner wall of the hub.

[0014] The guide wheel described above includes a plurality of second blades arranged at intervals, each second blade is connected by an inner wheel disc and an outer wheel disc, a one-way clutch is embedded in the inner wheel disc, and a first channel for hydraulic oil to flow through is formed between two adjacent second blades, and a plurality of third blades arranged at intervals are provided in the one-way clutch, and a second channel for hydraulic oil to flow through is formed between two adjacent third blades.

[0015] The above-mentioned turbine includes a partition, the locking clutch is attached to one side surface of the partition, and the other side surface of the partition is provided with a plurality of fourth blades and a plurality of fifth blades, the fourth blades are arranged at intervals and form an inner impeller, and the fifth blades are arranged at intervals and form an outer impeller, and the outer impeller radially protrudes outside the outer wheel disk of the guide wheel.

[0016] The outer edge of the partition plate protrudes into an arc-shaped convex edge in the direction of the guide wheel.

[0017] The curvatures of the first blade, the second blade, the fourth blade and the fifth blade are all different.

[0018] The second object of the present invention is to provide a new energy electric vehicle, including a dual-motor coupling drive system, characterized in that: the dual-motor coupling drive system is the dual-motor coupling drive system described above.

[0019] Compared with the prior art, the present invention has the following effects:

[0020] 1) The dual-motor coupling drive system is characterized in that it comprises: a main drive motor, comprising a first motor housing, a first stator assembly, a first rotor assembly and a first rotating shaft, wherein two ends of the first rotating shaft extend out of the first motor housing to form a front axle extension end and a rear axle extension end, respectively, and the front axle extension end is used to connect the load; an auxiliary drive motor, comprising a second motor housing, a second stator assembly, a second rotor assembly and a second rotating shaft, wherein the front end of the second rotating shaft extends out of the second motor housing to form a second front axle extension end; a hydraulic torque converter, which is used to connect the second front axle extension end of the auxiliary drive motor and the rear axle extension end of the main drive motor; under normal circumstances, the load is driven by the main drive motor, and when the output torque of the main drive motor is insufficient, the auxiliary drive motor is coupled to the main drive motor through the hydraulic torque converter, and the torque of the auxiliary drive motor is transmitted to the main drive motor, so that the torque of the main drive motor and the auxiliary drive motor are superimposed to meet the torque output of the overall drive system; the dual-motor coupling drive system has a simple structure, and the auxiliary drive motor and the main drive motor are coupled through the hydraulic torque converter, so that the reliability is high, the noise is low, and the operation is stable.

[0021] 2) Other advantages of the present invention are described in detail in the embodiment section. Description of the drawings:

[0022] Figure 1 It is a schematic diagram of the principle of a single motor matched with a speed change mechanism drive in the prior art;

[0023] Figure 2 It is a schematic diagram of the principle of dual-motor gear coupling drive in the prior art;

[0024] Figure 3 It is a schematic diagram of the principle of dual-motor electronically controlled clutch drive in the prior art;

[0025] Figure 4 is a schematic diagram of the principle of a dual-motor coupling drive system provided in Embodiment 1 of the present invention;

[0026] Figure 5 It is the working principle diagram of the dual motor coupling drive system;

[0027] Figure 6 It is a schematic diagram of the structure of the torque converter in the dual-motor coupling drive system;

[0028] Figure 7 is a cross-sectional view of a torque converter;

[0029] Figure 8 This is an exploded view of the torque converter;

[0030] Fig. 9 This is an exploded view of the torque converter from another angle;

[0031] Fig.10 It is a schematic diagram of the structure of the turbine in the torque converter;

[0032] Fig.11 It is a schematic diagram of the structure of the combination of the guide wheel and the one-way clutch in the torque converter;

[0033] Fig.12 It is a cross-sectional view of the dual-motor coupled drive system. Specific implementation method:

[0034] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0035] Embodiment 1:

[0036] like Figures 4 to 12 As shown, this embodiment provides a dual-motor coupling drive system, which is characterized by comprising:

[0037] A main drive motor 2, comprising a first motor housing 22, a first stator assembly 23, a first rotor assembly 24 and a first rotating shaft 21, wherein two ends of the first rotating shaft 21 extend out of the first motor housing to form a front axle extension end 212 and a rear axle extension end 211, respectively, and the front axle extension end 212 is used to connect a load;

[0038] An auxiliary drive motor 1, comprising a second motor housing 12, a second stator assembly 13, a second rotor assembly 14 and a second rotating shaft 11, wherein a front end of the second rotating shaft 11 extends out of the second motor housing 12 to form a second front axle extension end 111;

[0039] A hydraulic torque converter 3, used to connect the second front axle extension end 111 of the auxiliary drive motor 1 and the rear axle extension end 211 of the main drive motor 2;

[0040] Under normal circumstances, the load is driven by the main drive motor 2. When the output torque of the main drive motor 2 is insufficient, the auxiliary drive motor 1 is coupled to the main drive motor 2 through the torque converter 3, and the torque of the auxiliary drive motor 1 is transmitted to the main drive motor 2, so that the torque of the main drive motor 2 and the auxiliary drive motor 1 are superimposed to meet the torque output of the overall drive system.

[0041] The dual-motor coupling drive system has a simple structure, and couples the auxiliary drive motor 1 and the main drive motor 2 via the torque converter 3 , so it has high reliability and low noise.

[0042] The above also includes a motor controller 4, which controls the operation of the main drive motor 2 and the auxiliary drive motor 1. Under normal circumstances, the motor controller 4 controls the main drive motor 2. When the output torque of the main drive motor 2 is insufficient, the motor controller 4 simultaneously controls the speed of the main drive motor 2 and the auxiliary drive motor 1, and couples the torque of the main drive motor 2 and the auxiliary drive motor 1 through the torque converter 3, so that the control is simple and accurate.

[0043] The first rotating shaft of the main driving motor 2 and the second rotating shaft of the auxiliary driving motor 1 are arranged on the same axis, so the structure is simpler and the operation is more stable.

[0044] The above-mentioned torque converter 3 includes a torque converter housing 31, a locking clutch 32, a one-way clutch 33, a pump wheel 34, a guide wheel 35, a turbine 36 and hydraulic oil 37. The second front axle extension end 111 of the auxiliary drive motor 1 drives the torque converter housing 31. The outer edge of the torque converter housing 31 is installed and connected with the outer edge of the pump wheel 34 to form a pump chamber 30. The guide wheel 35 is sleeved on the one-way clutch 33. The locking clutch 32, the turbine 36, the guide wheel 35 and the hydraulic oil 37 are located in the pump chamber 30. The rear axle extension end 211 of the main drive motor 2 passes through the through hole 342 in the middle of the pump wheel 34 and extends into the pump chamber 30. The locking clutch 32, the turbine 36 and the guide wheel 35 are installed on the rear axle extension end 211 from left to right in sequence. The locking clutch 32, the turbine 36, the guide wheel 35 and the pump wheel 34 are arranged along the rear axle extension end 211 from left to right.

[0045] The working principle of the torque converter 3 is as follows: during normal operation, the main drive motor 2 works alone, and the rear axle extension end 211 drives the locking clutch 32, the turbine 36, the guide wheel 35, and the pump wheel 34 to operate. At this time, the built-in hydraulic oil 37 in the pump chamber 30 will be stirred accordingly. When the speed of the main drive motor 2 increases, the oil pressure of the hydraulic oil 37 will also increase. Since the one-way clutch 33 is embedded in the guide wheel 35, the guide wheel 35 will move with the increase in oil pressure and play a role in releasing the oil pressure, thereby preventing the action of the main drive motor 2 from driving the auxiliary drive motor 1 to operate. When the main drive motor 2 needs the auxiliary drive motor 1 to intervene in the driving state, the second front axle extension end 111 of the auxiliary drive motor 1 drives the pump wheel 34 to rotate through the torque converter housing 31. The hydraulic oil 37 continues to increase under the drive of the pump wheel 34. When the speed of the pump wheel 34 is the same as the speed of the guide wheel 35, the hydraulic pressure between the pump wheel 34 and the guide wheel 35 is balanced. The oil pressure of the hydraulic oil 37 pushes the locking clutch 32 toward the torque converter housing 31 and attracts it. The torque of the auxiliary drive motor 1 is transmitted to the motor 2 by the locking clutch 32, realizing the superposition of the torques of the two motors and increasing the output shaft torque of the drive system. The flow direction of the hydraulic oil 37 is as follows: Figure 4As shown by the arrow, the hydraulic oil 37 is driven by the pump wheel 34 to flow through the guide wheel 35 and the one-way clutch 33. At this time, the one-way clutch 33 in the guide wheel 35 plays a buffering role when the speeds of the main drive motor 2 and the auxiliary drive motor 1 fluctuate (the two speeds deviate from the set value). When the output torque of the drive system does not require the superposition of the two motors, the auxiliary drive motor 1 is controlled by the motor controller 4 to gradually reduce the speed and torque of the auxiliary drive motor 1, so that the hydraulic pressure on both sides of the locking clutch 32 in the pump chamber 30 is in a certain difference state, the locking clutch 32 is separated from the torque converter housing 31, and the main drive motor 2 works alone.

[0046] The impeller 34 includes a hub 343 and a plurality of first blades 341 disposed at intervals on the inner wall of the hub 343 .

[0047] The guide wheel 35 includes a plurality of second blades 351 arranged at intervals, each second blade 351 is connected by an inner wheel disc 352 and an outer wheel disc 353, the one-way clutch 33 is embedded in the inner wheel disc 352, and a first channel 354 for hydraulic oil to flow through is formed between two adjacent second blades 351, and a plurality of third blades 331 arranged at intervals are provided in the one-way clutch 33, and a second channel 332 for hydraulic oil to flow through is formed between two adjacent third blades 331. The first channel 354 and the second channel 332 are more conducive to the flow of hydraulic oil 37.

[0048] The turbine 36 described above includes a partition 361, and the locking clutch 32 is attached to one side surface of the partition 361. The other side surface of the partition 361 is provided with a plurality of fourth blades 3620 and a plurality of fifth blades 3630. The fourth blades 3620 are arranged at intervals and form an inner impeller 362. The fifth blades 3630 are arranged at intervals and form an outer impeller 363. The outer impeller 363 radially protrudes from the outer wheel disc 353 of the guide wheel 35. The inner impeller 362 is radially located between the first channel 354 and the second channel 332.

[0049] The outer edge of the partition plate 361 has an arc-shaped convex edge 364 protruding toward the guide wheel 35 to further enhance the flow of the hydraulic oil 37 .

[0050] The curvatures of the first blade 341, the second blade 351, the fourth blade 3620 and the fifth blade 3630 are all different. The curvatures of the first blade 341, the second blade 351, the fourth blade 3620 and the fifth blade 3630 are designed according to their respective working states, so that the working reliability of the torque converter 3 is further improved.

[0051] Embodiment 2:

[0052] This embodiment provides a new energy electric vehicle, including a dual motor coupling drive system 100, characterized in that the dual motor coupling drive system 100 is the dual motor coupling drive system described in Example 1. The new energy electric vehicle power system has a simple structure, reliable operation, and low noise.

[0053] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are all equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A dual-motor coupling drive system, characterized in that: include: A main drive motor (2) comprises a first motor housing (22), a first stator assembly (23), a first rotor assembly (24) and a first rotating shaft (21), wherein two ends of the first rotating shaft (21) extend out of the first motor housing (22) to form a front axle extension end (212) and a rear axle extension end (211), respectively, and the front axle extension end (212) is used to connect a load; An auxiliary drive motor (1) comprises a second motor housing (12), a second stator assembly (13), a second rotor assembly (14) and a second rotating shaft (11), wherein the front end of the second rotating shaft (11) extends out of the second motor housing (12) to form a second front shaft extension end (111); A hydraulic torque converter (3) for connecting the second front axle extension end (111) of the auxiliary drive motor (1) and the rear axle extension end (211) of the main drive motor (2); Under normal circumstances, the load is driven by the main drive motor (2). When the output torque of the main drive motor (2) is insufficient, the auxiliary drive motor (1) is coupled to the main drive motor (2) through the hydraulic torque converter (3), and the torque of the auxiliary drive motor (1) is transmitted to the main drive motor (2), so that the torques of the main drive motor (2) and the auxiliary drive motor (1) are superimposed to meet the torque output of the overall drive system.

2. A dual-motor coupling drive system according to claim 1, characterized in that: It also includes a motor controller (4), which controls the operation of the main drive motor (2) and the auxiliary drive motor (1).

3. A dual-motor coupling drive system according to claim 2, characterized in that: The first rotating shaft of the main drive motor (2) and the second rotating shaft of the auxiliary drive motor (1) are arranged on the same axis.

4. A dual-motor coupling drive system according to claim 1, 2 or 3, characterized in that: The hydraulic torque converter (3) comprises a torque converter housing (31), a locking clutch (32), a one-way clutch (33), a pump wheel (34), a guide wheel (35), a turbine (36) and hydraulic oil (37); the second front axle extension end (111) of the auxiliary drive motor (1) drives the torque converter housing (31); the outer edge of the torque converter housing (31) is connected to the outer edge of the pump wheel (34) to form a pump chamber (30); the guide wheel (35) is sleeved on the one-way clutch (33); the locking clutch (32), The turbine (36), the guide wheel (35) and the hydraulic oil (37) are located in the pump chamber (30); the rear axle extension end (211) of the main drive motor (2) passes through the through hole (342) in the middle of the pump wheel (34) and extends into the pump chamber (30); the locking clutch (32), the turbine (36) and the guide wheel (35) are sequentially installed on the rear axle extension end (211) from left to right; the locking clutch (32), the turbine (36), the guide wheel (35) and the pump wheel (34) are arranged along the rear axle extension end (211) from left to right.

5. A dual-motor coupling drive system according to claim 4, characterized in that: The pump wheel (34) comprises a hub (343) and a plurality of first blades (341) arranged at intervals on the inner wall of the hub (343).

6. A dual-motor coupling drive system according to claim 5, characterized in that: The guide wheel (35) includes a plurality of second blades (351) arranged at intervals, each second blade (351) is connected by an inner wheel disc (352) and an outer wheel disc (353), the one-way clutch (33) is embedded in the inner wheel disc (352), and a first channel (354) for hydraulic oil to flow through is formed between two adjacent second blades (351), and a plurality of third blades (331) arranged at intervals are provided in the one-way clutch (33), and a second channel (332) for hydraulic oil to flow through is formed between two adjacent third blades (331).

7. A dual-motor coupling drive system according to claim 6, characterized in that: The turbine (36) includes a partition (361), the locking clutch (32) is attached to one side surface of the partition (361), and the other side surface of the partition (361) is provided with a plurality of fourth blades (3620) and a plurality of fifth blades (3630), the fourth blades (3620) are arranged at intervals and form an inner impeller (362), and the fifth blades (3630) are arranged at intervals and form an outer impeller (363), and the outer impeller (363) protrudes radially from the outer wheel disc (353) of the guide wheel (35).

8. A dual-motor coupling drive system according to claim 7, characterized in that: The outer edge of the partition (361) has an arc-shaped convex edge (364) protruding in the direction of the guide wheel (35).

9. A dual-motor coupling drive system according to claim 8, characterized in that: The curvatures of the first blade (341), the second blade (351), the fourth blade (3620) and the fifth blade (3630) are all different.

10. A new energy electric vehicle, comprising a dual-motor coupling drive system (100), characterized in that: The dual-motor coupling drive system (100) is the dual-motor coupling drive system according to any one of claims 1 to 9.

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