Dual-mode electric drive system and vehicle

Abstract

The present invention relates to the field of vehicle power arrangement, and in particular to a dual-mode electric drive system and a vehicle. A first motor and a second motor in the dual-mode electric drive system are connected to an output end by means of a gear transmission structure, and a clutch is provided between the first motor or the second motor and the output end so as to selectively engage the first motor or the second motor with the dual-mode electric drive system. When a vehicle is in an operating condition of a lower power demand, one of the motors can be disengaged from the dual-mode electric driving system by means of the clutch, so that only one motor is used for driving, which helps to keep the motor at relatively high output power, thus solving the problem in the prior art that both motors in a dual-motor electric driving system outputting power leads to low output power of every single motor, and accordingly the low output power of the two motors leads to a decrease in motor efficiency when a vehicle is in an operating condition of a lower power demand.

Description

Dual-mode electric drive system and vehicle Technical Field

[0001] The present invention relates to the field of vehicle power layout, and in particular to a dual-mode electric drive system and a vehicle. Background Art

[0002] With the progress of energy conservation and emission reduction, new energy vehicles, especially pure electric vehicles, are becoming increasingly popular, and a variety of power system layouts have emerged. For example, a Chinese utility model patent with authorization announcement number CN211000771U and authorization announcement date of July 14, 2020, discloses an electric drive axle with dual-motor single-speed parallel shaft output. The electric drive axle includes two motors, a first motor and a second motor. The two motors transmit output power to the output end through a two-stage gear transmission structure composed of multiple gears. The output end is integrated with a differential and an output gear, which is connected to the left and right half-axles of the vehicle through the differential to drive the wheels. The first motor and the second motor are distributed in mirror symmetry about the axes of the two half-axles.

[0003] In the above technical solution, the two motors are of the same model and are both connected to the electric drive axle. Both motors need to be working, and the output power of each motor is equal to half the power required to move the vehicle forward. When the vehicle is in an operating condition with low power and torque requirements, such as slow starting, slow acceleration, and climbing a gentle slope, the power required for the vehicle to move forward is relatively small, so the torque required by each motor is even smaller. At this time, the motor operating point power is low, resulting in lower motor efficiency. In addition, because both motors are connected to the vehicle half-axles through a differential, the power distribution of the vehicle half-axles is completed at the differential, making it impossible to independently or precisely control each vehicle half-axle.

[0004] Summary of the Invention

[0005] The object of the present invention is to provide a dual-mode electric drive system to solve the problem in the prior art that in the dual-motor electric drive system, both motors output power, resulting in a small output power of a single motor, and when the vehicle is in a working condition with low power demand, the two motors have low output power, resulting in reduced motor efficiency; the object of the present invention is also to provide a vehicle for solving the above technical problems.

[0006] To achieve the above objectives, the dual-mode electric drive system of the present invention adopts the following technical solutions:

[0007] A dual-mode electric drive system includes a first motor and a second motor, the first motor and the second motor are connected to an output end via a gear transmission structure, the output end includes two vehicle half-axles and a differential connected between the two vehicle half-axles, and a clutch is provided between the first motor or the second motor and the output end to enable the first motor or the second motor to selectively connect to the dual-mode electric drive system.

[0008] Furthermore, the gear transmission structure includes a first gear transmission structure connected to the first motor and a second gear transmission structure connected to the second motor, the first gear transmission structure includes a first output gear located at the end, the second gear transmission structure includes a second output gear located at the end, one of the first output gear and the second output gear is arranged on the vehicle half shaft, and the other is arranged on the differential housing.

[0009] Furthermore, one of the first gear transmission structure and the second gear transmission structure is connected to the differential, and the other one is configured with the clutch.

[0010] Furthermore, the first motor and the second motor are both located at the front side or the rear side of the two vehicle half-axles.

[0011] Furthermore, the output shafts of the first motor and the second motor are arranged parallel to the vehicle half-axles.

[0012] Furthermore, the first motor and the second motor are coaxially arranged.

[0013] Furthermore, the first gear transmission structure and the second gear transmission structure are both two-stage transmissions.

[0014] Furthermore, the dual-mode electric drive system further includes a transmission housing, and the first gear transmission structure and the second gear transmission structure are both arranged in the transmission housing.

[0015] Furthermore, the transmission housing includes a first transmission housing for accommodating the first gear transmission structure and a second transmission housing for accommodating the second gear transmission structure, which are separately arranged. The first transmission housing and the second transmission housing are fixedly connected.

[0016] The beneficial effects of the dual-mode electric drive system of the present invention are as follows: the present invention improves the dual-mode electric drive system in the prior art, and facilitates power transmission by providing two motors and a gear transmission structure, so as to facilitate the transmission of the power output by the two motors to the output end, thereby driving the rotation of the wheels through the half-shaft and the differential; by providing a clutch and arranging the clutch between the first motor and the output end or between the second motor and the output end, the first motor or the second motor can be selectively connected to the dual-mode electric drive system. When the vehicle is in a working condition with low power demand, the clutch can be used to disconnect one of the motors from the dual-mode electric drive system, and only one motor can be used for driving, so as to facilitate maintaining the motor at a relatively large output power and maintaining the high efficiency of the motor, thereby solving the problem in the dual-motor electric drive system in the prior art that both motors output power, resulting in a low output power of a single motor, and when the vehicle is in a working condition with low power demand, the two motors have low output power, resulting in reduced motor efficiency.

[0017] To achieve the above objectives, the vehicle of the present invention adopts the following technical solutions:

[0018] A vehicle includes an electric drive system, wherein the electric drive system includes a first motor and a second motor, the first motor and the second motor are connected to an output end via a gear transmission structure, the output end includes two vehicle half-axles and a differential connected between the two vehicle half-axles, and a clutch is provided between the first motor or the second motor and the output end to enable the first motor or the second motor to selectively connect to the dual-mode electric drive system.

[0019] Furthermore, the gear transmission structure includes a first gear transmission structure connected to the first motor and a second gear transmission structure connected to the second motor, the first gear transmission structure includes a first output gear located at the end, the second gear transmission structure includes a second output gear located at the end, one of the first output gear and the second output gear is arranged on the vehicle half shaft, and the other is arranged on the differential housing.

[0020] Furthermore, one of the first gear transmission structure and the second gear transmission structure is connected to the differential, and the other one is configured with the clutch.

[0021] Furthermore, the first motor and the second motor are both located at the front side or the rear side of the two vehicle half-axles.

[0022] Furthermore, the output shafts of the first motor and the second motor are arranged parallel to the vehicle half-axles.

[0023] Furthermore, the first motor and the second motor are coaxially arranged.

[0024] Furthermore, the first gear transmission structure and the second gear transmission structure are both two-stage transmissions.

[0025] Furthermore, the dual-mode electric drive system further includes a transmission housing, and the first gear transmission structure and the second gear transmission structure are both arranged in the transmission housing.

[0026] Furthermore, the transmission housing includes a first transmission housing for accommodating the first gear transmission structure and a second transmission housing for accommodating the second gear transmission structure, which are separately arranged. The first transmission housing and the second transmission housing are fixedly connected.

[0027] The beneficial effects of the dual-mode electric drive system of the present invention are as follows: the present invention improves the vehicle in the prior art, and facilitates power transmission by providing two motors and a gear transmission structure, and facilitates the transmission of the power output by the two motors to the output end, thereby driving the rotation of the wheels through the half-shaft and the differential; by providing a clutch and arranging the clutch between the first motor and the output end or between the second motor and the output end, the first motor or the second motor can be selectively connected to the dual-mode electric drive system. When the vehicle is in a working condition with low power demand, the clutch can be used to disconnect one of the motors from the dual-mode electric drive system, and only one motor can be used for driving, so as to facilitate maintaining the motor at a relatively large output power and maintaining the high efficiency of the motor, thereby solving the problem in the dual-motor electric drive system in the prior art that both motors output power, resulting in a small output power of a single motor, and when the vehicle is in a working condition with low power demand, the two motors have low output power, resulting in reduced motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic structural diagram of an embodiment of a dual-mode electric drive system of the present invention;

[0029] FIG2 is a schematic structural diagram of another embodiment of a dual-mode electric drive system according to the present invention.

[0030] In the figure: 1. Clutch; 2. First motor; 3. First gear; 4. Second gear; 5. First intermediate shaft; 6. Third gear; 7. Fourth gear; 8. First half shaft; 9. Fifth gear; 10. Differential; 11. Second half shaft; 12. Sixth gear; 13. Second intermediate shaft; 14. Seventh gear; 15. Eighth gear; 16. Second motor; 17. Second output shaft; 18. First output shaft. DETAILED DESCRIPTION

[0031] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0032] In the present invention, a clutch is provided between the first motor or the second motor and the output end so that the first motor or the second motor can be selectively connected to the dual-mode electric drive system.

[0033] In embodiment 1 of the dual-mode electric drive system of the present invention:

[0034] As shown in Figure 1, the dual-mode electric drive system in this embodiment includes a first motor 2 and a second motor 16, as well as two vehicle axles for driving the wheels. Specifically, the two axles are a first axle 8 and a second axle 11. A differential 10 is disposed between the first axle 8 and the second axle 11, enabling the first axle 8 and the second axle 11 to rotate at different speeds. The first axle 8, the second axle 11, and the differential 10 constitute the output of the dual-mode electric drive system. A first gear transmission structure composed of gears is disposed between the first motor 2 and the output, and a second gear transmission structure composed of gears is disposed between the second motor 16 and the output.

[0035] As shown in Figure 1, the first gear transmission structure includes two stages of transmission gears, specifically, a first gear 3, a second gear 4, a third gear 6, and a fourth gear 7. The second gear 4 and the third gear 6 are coaxially arranged and fixedly mounted on the first intermediate shaft 5. When the first motor 2 rotates, power is transmitted to the first gear 3 via the first output shaft 18 of the first motor 2. The first gear 3 then meshes with the second gear 4, transmitting the power to the second gear 4. Because the second gear 4 and the third gear 6 are coaxially arranged, the second gear 4 and the third gear 6 rotate at the same speed. The third gear 6 then meshes and transmits the power to the fourth gear 7. The fourth gear 7 constitutes the final gear of the first gear transmission structure, or the first output gear. To facilitate power output from the first gear transmission structure, the fourth gear 7 is fixedly mounted on the first axle 8. The rotation of the fourth gear 7 drives the rotation of the first axle 8, thereby enabling the first motor 2 to transmit power and speed to the output end through the first gear transmission structure. It is worth noting that both stages of the transmission gears in the first gear transmission structure are geared for output, thereby facilitating torque reduction and torque amplification of the motor output, thereby providing a high torque output. Of course, in other embodiments, the first gear transmission structure may also be a three-stage transmission or a single-stage transmission.

[0036] As shown in FIG1 , the second gear transmission structure also includes two stages of transmission gears, specifically, an eighth gear 15, a seventh gear 14, a sixth gear 12, and a fifth gear 9. The sixth gear 12 and the seventh gear 14 are coaxially arranged and fixed to the second intermediate shaft 13, so that the sixth gear 12 and the seventh gear 14 rotate synchronously. When the second motor 16 rotates, power is first transmitted to the eighth gear 15 via the second output shaft 17 of the second motor 16. The power and speed are then transmitted to the seventh gear 14 through the meshing of the eighth gear 15 and the seventh gear 14. The power and speed are then transmitted to the sixth gear 12 via the action of the second intermediate shaft 13. The sixth gear 12 then transmits the power and speed to the fifth gear 9 through gear meshing. The fifth gear 9 constitutes the final gear of the second gear transmission structure, i.e., the second output gear. To facilitate power output from the second gear transmission structure, the fifth gear 9 is fixed to the housing of the differential 10, thereby driving the housing of the differential 10 to rotate. Since the differential 10 is located between the first half-shaft 8 and the second half-shaft 11, the power can be split between the first half-shaft 8 and the second half-shaft 11 through the differential 10. Of course, in other embodiments, the second gear transmission structure can also be a three-stage transmission or a single-stage transmission.

[0037] In order to ensure that the two motors are no longer connected to the dual-mode electric drive system at the same time when the vehicle requires less power, a clutch 1 is provided on the output end of the first motor 2. The clutch 1 can selectively output power, that is, the first motor 2 can be connected to the dual-mode electric drive system so that the two motors in the dual-mode electric drive system can work at the same time. Of course, the two motors can also be disconnected so that the dual-mode electric drive system can only rely on the second motor 16 for power output.

[0038] Alternatively, in other embodiments, the clutch 1 may be positioned within the first gear transmission structure, such as between the second gear 4 and the third gear 6, thereby enabling the first motor 2 to operate independently of the dual-mode electric drive system. Of course, in other embodiments, as shown in FIG2 , the clutch 1 may also be positioned between the second motor 16 and the second gear transmission structure, or between the sixth gear 12 and the seventh gear 14 of the second gear transmission structure. Alternatively, in other embodiments, as shown in FIG2 , the differential 10 may be fixedly mounted to the fourth gear 7, in which case the fifth gear 9 is fixedly connected to the second half-shaft 11. In other embodiments, the first and second gear transmission structures may not be separate, but rather a planetary gear system connected to the first and second motors 2 and 16 may be provided. The first and second motors 2 and 16 serve as the two inputs of the planetary gear system, through which the power of the two motors is combined and output to the output.

[0039] There are many gears in the first gear transmission structure and the second gear transmission structure, and the gears need to be cooled and lubricated during the rotation process. Therefore, the dual-mode electric drive system is also provided with a transmission housing for accommodating the gear transmission structure. The first gear transmission structure and the second gear transmission structure are both arranged in the transmission housing, and a structure for lubricating and cooling the gears and collecting coolant is provided in the gear transmission structure. In order to simplify the difficulty of arranging the transmission housing, the transmission housing is provided as an integrated unit, and the first gear transmission structure and the second gear transmission structure are accommodated inside the transmission housing at the same time. Of course, in other embodiments, the transmission housing can also be divided into a first transmission housing for accommodating the first gear transmission structure and a second transmission housing for accommodating the second gear transmission structure. The first transmission housing and the second transmission housing are separately provided, and finally the first transmission housing and the second transmission housing are fixed together by bolts or welding.

[0040] As shown in Figure 1, the first gear transmission structure and the second gear transmission structure are arranged on the same side of the vehicle half-axle. Correspondingly, the first motor 2 and the second motor 16 are also arranged on the same side of the vehicle half-axle. The transmission ratio of the first gear transmission structure is the same as the transmission ratio of the second gear transmission structure, and the same size, thereby facilitating symmetrical arrangement. The first motor 2 and the second motor 16 also maintain the same specifications. The gears in the gear transmission structure are straight teeth or helical teeth. The first gear transmission structure and the second gear transmission structure are both parallel axis gear transmission structures. The output shafts of the corresponding first motor 2 and the second motor 16 are respectively arranged parallel to the vehicle half-axle. Since the first motor 2 and the second motor 16 are identical and the first gear transmission structure is identical to the second gear transmission structure, the positions of the first motor 2 and the second motor 16 relative to the vehicle half-axle are also the same. In this case, the first motor 2 and the second motor 16 are arranged coaxially.

[0041] Of course, in other embodiments, the transmission ratios and sizes of the first and second gear transmission structures may differ, and the specifications of the first and second motors 2, 16 may differ. In this case, the first and second motors 2, 16 are no longer coaxially arranged. Of course, in other embodiments, the gears may be bevel gears, in which case the output shafts of the motors are no longer parallel to the vehicle axles but remain perpendicular.

[0042] When the vehicle's power and torque requirements are low, such as during slow starting, slow acceleration, or climbing a gentle slope, or when the vehicle is braking at low or medium speeds and the feedback power and torque are low, or when the vehicle is cruising at high speed and low power, the clutch 1 is disengaged, allowing only the second motor 16 in the dual-mode electric drive system to output power. In this case, the first motor 2 is independent of the dual-mode electric drive system. When the vehicle's power and torque requirements are high, such as during high speed, rapid acceleration, or climbing a steep slope, or when the vehicle is braking at high speed and high power, or when the vehicle is in emergency high-torque braking, or when the vehicle is cruising at high speed and medium power, due to the high power requirements, the clutch 1 is engaged, and both the first motor 2 and the second motor 16 can output power. It is worth noting that when the clutch 1 is engaged, the output shaft of the first motor 2 and the first axle 8 maintain a fixed speed ratio for transmission, allowing the first motor 2 to precisely control the first axle 8.

[0043] In an embodiment of a vehicle of the present invention, the vehicle includes an electric drive system, wherein the electric drive system has the same structure as the dual-mode electric drive system in the above-mentioned dual-mode electric drive system, which will not be repeated here.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A dual-mode electric drive system comprising a first motor and a second motor, the first motor and the second motor being connected to an output terminal via a gear transmission structure, the output terminal comprising two vehicle half-axles and a differential connected between the two vehicle half-axles, characterized in that: A clutch is provided between the first motor or the second motor and the output end so that the first motor or the second motor can be selectively connected to the dual-mode electric drive system.

2. The dual-mode electric drive system according to claim 1, characterized in that: The gear transmission structure includes a first gear transmission structure connected to the first motor and a second gear transmission structure connected to the second motor, the first gear transmission structure includes a first output gear located at the end, the second gear transmission structure includes a second output gear located at the end, one of the first output gear and the second output gear is set on the vehicle half shaft, and the other is set on the differential housing.

3. The dual-mode electric drive system according to claim 2, characterized in that: One of the first gear transmission structure and the second gear transmission structure is connected to the differential, and the other one is configured with the clutch.

4. The dual-mode electric drive system according to any one of claims 1 to 3, characterized in that: The first motor and the second motor are both located at the front side or the rear side of the two vehicle half-axles.

5. The dual-mode electric drive system according to claim 4, characterized in that: The output shafts of the first motor and the second motor are arranged parallel to the vehicle half shafts.

6. The dual-mode electric drive system according to claim 5, characterized in that: The first motor and the second motor are coaxially arranged.

7. The dual-mode electric drive system according to claim 2 or 3, characterized in that: The first gear transmission structure and the second gear transmission structure are both two-stage transmissions.

8. The dual-mode electric drive system according to claim 2 or 3, characterized in that: The dual-mode electric drive system further includes a transmission housing, wherein the first gear transmission structure and the second gear transmission structure are both disposed in the transmission housing.

9. The dual-mode electric drive system according to claim 8, characterized in that: The transmission housing includes a first transmission housing for accommodating the first gear transmission structure and a second transmission housing for accommodating the second gear transmission structure, which are separately arranged. The first transmission housing and the second transmission housing are fixedly connected.

10. A vehicle comprising an electric drive system, characterized in that: The electric drive system is the same as the dual-mode electric drive system described in any one of claims 1-9.

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