Double-motor electric drive assembly system for pure electric vehicle

Abstract

The invention discloses a double-motor electric drive assembly system for a pure electric vehicle, which comprises a power drive system which comprises a main drive unit, a planetary gear differential assembly and a power release mechanism, the main drive unit and the auxiliary drive unit transmit power to the planet wheel differential assembly through a main drive motor and an auxiliary drive motor respectively and finally output the power to a wheel half shaft. The double-motor electric drive system is simple and compact in structure and simple in control logic, when the vehicle is started and starts to run, the double motors are started at the same time so that the acceleration performance and the climbing performance of the whole vehicle can be improved, and when the vehicle system at the high vehicle speed does not need large power performance, the power disengaging mechanism is in a disengaging state; the auxiliary drive motor stops working after power interruption, and the vehicle is powered by the main drive motor, so that the energy consumption of the whole vehicle is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and more specifically to a dual-motor electric drive assembly system for a pure electric vehicle. Background Art

[0002] At present, most electric vehicle power systems adopt the structure of drive motor + single-stage reducer. This structure is simple, but the speed ratio of the main reducer has a great impact on the performance of electric vehicles, and it is impossible to take into account the performance requirements of maximum vehicle speed and starting acceleration at the same time. Therefore, in order to meet the design requirements, the peak torque and maximum speed of the drive motor have to be increased, which increases the power of the drive motor. However, if a motor with higher power is selected, the drive motor often works in a low-efficiency area during daily driving, which reduces the economy of the vehicle and increases the cost of the drive motor.

[0003] In order to solve this problem, the existing electric drive system of pure electric vehicles mostly uses a two-gear or even multi-gear speed reduction mechanism in its transmission system, and also requires complex gear shifting and motor control units, which leads to a complex transmission system structure, high cost, and high technical difficulty. In addition, when the transmission system structure is complex, the performance requirements for the motor will also be higher, and the motor cannot operate in the optimal working efficiency range. Therefore, a new technical solution is needed to solve this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a dual-motor electric drive assembly system for a pure electric vehicle, which solves the problem that the existing electric drive system of a pure electric vehicle mostly adopts a two-speed or even multi-speed reduction mechanism, and also requires a complex gear shifting and motor control unit, resulting in a complex transmission system structure, high cost, and great technical difficulty. In addition, when the transmission system structure is complex, the performance requirements for the motor will also be higher, and the motor cannot operate in the optimal working efficiency range.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A dual-motor electric drive assembly system for a pure electric vehicle, comprising: a power drive system, the power drive system comprising a main drive unit, a main drive unit, a planetary differential assembly and a power disengagement mechanism, the main drive unit and the auxiliary drive unit respectively transmit power to the planetary differential assembly through the main drive motor and the auxiliary drive motor and finally output it to the wheel half-axle, the output end of the main drive motor is provided with a main drive rotor shaft and the side of the main drive rotor shaft is provided with a main drive input gear, the auxiliary drive unit can realize switching between two working modes of engagement and disengagement, the power drive system has a first power mode and a second power mode, for the first power mode, power output is realized by the main drive unit alone, and for the second power mode, power output is realized by simultaneously coupling the main drive unit and the auxiliary drive unit.

[0006] As a preferred embodiment of the present invention, the auxiliary drive unit is provided with a power disengagement mechanism, and an auxiliary drive gear shaft is provided on one side of the power disengagement mechanism and connected thereto, and the other side is connected to the auxiliary drive rotor shaft.

[0007] As a preferred embodiment of the present invention, the auxiliary drive gear shaft adopts a double helical gear structure or a double spur gear structure.

[0008] As a preferred embodiment of the present invention, the main drive input gear and the main drive rotor shaft on the drive unit are designed as an integrated shaft.

[0009] As a preferred embodiment of the present invention, the planetary gear differential assembly includes an output gear, a planet carrier, a large sun gear, a small sun gear, a long planet gear, a short planet gear and fastening bolts.

[0010] As a preferred embodiment of the present invention, the output gear is fixed to the planet carrier by fastening bolts.

[0011] As a preferred embodiment of the present invention, the short planetary gears mesh with the long planetary gears and the small sun gear at the same time, and the long planetary gears mesh directly with the large sun gear at the same time.

[0012] As a preferred embodiment of the present invention, the output gear adopts a double helical gear structure or a double spur gear structure.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The dual-motor electric drive system of the present invention has a simple and compact structure and a simple control logic. When the vehicle starts to travel, the dual motors start at the same time, thereby improving the acceleration performance and climbing performance of the whole vehicle. When the vehicle speed is high and the vehicle system does not need a large power performance, the power disengagement mechanism is in a disengaged state, the auxiliary drive motor power is interrupted and stops working, and the vehicle is powered by the main drive motor, thereby reducing the energy consumption of the whole vehicle. When the pure electric vehicle is driving, the drive motor can be kept working in a high-efficiency range as much as possible, improving the power performance of the whole vehicle while reducing the energy consumption of the whole vehicle, improving the endurance, power and economy of the whole vehicle, and greatly reducing the cost of the whole vehicle; the main drive rotor shaft and the main drive input gear of the main drive motor are integrated into an integral shaft, and a power disengagement mechanism is provided between the auxiliary drive rotor shaft and the auxiliary drive gear shaft of the auxiliary drive motor, the main drive input gear and the auxiliary drive gear shaft are meshed with the output gear at the same time, and the planetary gear differential assembly includes a long star wheel, a large sun wheel, a short planet wheel, a small sun wheel, a planet carrier, an output gear and a fastening bolt, and the long planet wheel and the short planet wheel are meshed with the large sun wheel; the above-mentioned short planet wheel is meshed with the small sun wheel at the same time. The long planetary gear and the short planetary gear can rotate relative to the planetary carrier, wherein the output gear is fixed to the planetary carrier by fastening bolts, and the half-shafts are respectively connected to the large sun gear and the small sun gear. The power input obtained by the output gear is balanced through the torque between the long planetary gear and the short planetary gear, and the torque is diverted to the half-shafts, thereby realizing the differential speed and torque differential functions of the left and right wheels of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of Embodiment 1 of the present invention;

[0016] Figure 2 This is a structural diagram of Embodiment 2 of the present invention;

[0017] Figure 3 This is a structural diagram of embodiment 3 of the present invention.

[0018] In the figure: 1. main drive motor; 2. auxiliary drive motor; 3. power release mechanism; 4. auxiliary drive gear shaft; 5. planetary gear differential assembly; 6. half shaft; 7. main drive rotor shaft; 8. main drive input gear; 9. long planetary gear; 10. large sun gear; 11. short planetary gear; 12. small sun gear; 13. planet carrier; 14. output gear; 15. fastening bolts; 16. auxiliary drive rotor shaft. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Embodiment 1

[0021] See also Figure 1 The present invention provides a technical solution: a dual-motor electric drive assembly system for a pure electric vehicle, comprising: a power drive system, the power drive system comprising a main drive unit, a main drive unit, a planetary differential assembly 5 and a power disengagement mechanism 3, the main drive unit and the auxiliary drive unit respectively transmit power to the planetary differential assembly through the main drive motor 1 and the auxiliary drive motor 2 and finally output it to the wheel half shaft 6, the output end of the main drive motor 1 is provided with a main drive rotor shaft 7 and the side of the main drive rotor shaft 7 is provided with a main drive input gear 8, the auxiliary drive unit can realize the switching of two working modes of engagement state and disconnection state, the power drive system has a first power mode and a second power mode, for the first power mode, power output is realized by the main drive unit alone, for the second power mode, power output is realized by the main drive unit and the auxiliary drive unit are coupled simultaneously, the first power mode In the second power mode, the power disengagement mechanism is in the engaged state, the main drive motor 1 and the auxiliary drive motor 2 are both in the working state, and as the power input source at the same time, the main drive rotor shaft 7 and the main drive input gear 8 of the main drive motor 1 are integrated into an integral shaft, and a power disengagement mechanism 3 is arranged between the auxiliary drive rotor shaft 16 and the auxiliary drive gear shaft 4 of the auxiliary drive motor 2, the main drive input gear 8 and the auxiliary drive gear shaft 4 are meshed with the output gear 14 at the same time, the planetary gear differential assembly 5 includes a long star gear, a large sun gear 10, a short planet gear 11, a small sun gear 12, a planet carrier 13, an output gear 14 and a fastening bolt 15, the long planet gear 9 and the short planet gear 11 are meshed with the large sun gear 10; the above-mentioned short planet gear 11 is meshed with the small sun gear 12 at the same time. The long planetary gear 9 and the short planetary gear 11 can rotate relative to the planetary carrier 13, wherein the output gear 14 is fixedly connected to the planetary carrier 13 by fastening bolts 15, and the half shaft 6 is respectively connected to the large sun gear 10 and the small sun gear 12. The power input obtained by the output gear 14 is balanced by the torque between the long planetary gear 9 and the short planetary gear 11, and the torque is diverted to the half shaft 6, thereby realizing the differential speed and torque differential functions of the left and right wheels of the vehicle.

[0022] Further improvements, such as Figure 1 As shown: the auxiliary drive unit is provided with a power disengagement mechanism 3, and an auxiliary drive gear shaft 4 is provided on the side of the power disengagement mechanism 3 and connected thereto and the other side is connected to the auxiliary drive rotor shaft 16 for controlling the working state of the auxiliary drive motor 2.

[0023] Further improvements, such as Figure 1 As shown: the auxiliary drive gear shaft 4 adopts a double helical gear structure or a double spur gear structure.

[0024] Further improvements, such as Figure 1 As shown: the main drive input gear 8 and the main drive rotor shaft 7 on the drive unit are designed as an integral shaft.

[0025] Further improvements, such as Figure 1 As shown, the planetary gear differential assembly 5 includes an output gear 14 , a planet carrier 13 , a large sun gear 10 , a small sun gear 12 , a long planet gear 9 , a short planet gear 11 and fastening bolts 15 .

[0026] Further improvements, such as Figure 1 As shown: the output gear 14 is fixed on the planet carrier 13 by fastening bolts 15.

[0027] Further improvements, such as Figure 1 As shown, the short planetary gear 11 is meshed with the long planetary gear 9 and the small sun gear 12 at the same time, and the long planetary gear 9 is directly meshed with the large sun gear 10 at the same time.

[0028] Further improvements, such as Figure 1 As shown: the output gear 14 adopts a double helical gear structure or a double spur gear structure.

[0029] Embodiment 2

[0030] See also Figure 2 The present invention provides a technical solution: a dual-motor electric drive assembly system for a pure electric vehicle, wherein the main drive motor 1 and the auxiliary drive motor 2 can be arranged symmetrically relative to the half shaft 6.

[0031] Embodiment 3

[0032] See also Figure 3 The present invention provides a technical solution: a dual-motor electric drive assembly system for a pure electric vehicle, wherein the main drive motor 1 and the auxiliary drive motor 2 may also be coaxially arranged.

[0033] Working principle: The dual-motor electric drive system has a simple and compact structure and simple control logic. When the vehicle starts to move, the dual motors start at the same time, thereby improving the acceleration performance and climbing performance of the vehicle. When the vehicle speed is high and the vehicle system does not need greater power performance, the power disengagement mechanism 3 is in a disengaged state, the auxiliary drive motor 2 is interrupted and stops working, and the vehicle is powered by the main drive motor 1, thereby reducing the energy consumption of the vehicle. When a pure electric vehicle is running, the drive motor can be kept working in a high efficiency range as much as possible, thereby improving the power performance of the whole vehicle while reducing the energy consumption of the whole vehicle, improving the endurance, power and economy of the whole vehicle, and greatly reducing the cost of the whole vehicle; the main drive rotor shaft 7 and the main drive input gear 8 of the main drive motor are integrated into an integral shaft, and a power disengagement mechanism 3 is arranged between the auxiliary drive rotor shaft 16 of the auxiliary drive motor 2 and the auxiliary drive gear shaft 4, the main drive input gear 8 and the auxiliary drive gear shaft 4 are meshed with the output gear 14 at the same time, the planetary gear differential assembly 5 includes a long star gear, a large sun gear 10, a short planet gear 11, a small sun gear 12, a planet carrier 13, an output gear 14 and a fastening bolt 15, the long planet gear 9 and the short planet gear 11 are meshed with the large sun gear 10; the above-mentioned short planet gear 11 is meshed with the small sun gear 12 at the same time. The long planetary gear 9 and the short planetary gear 11 can rotate relative to the planetary carrier 13, wherein the output gear 14 is fixedly connected to the planetary carrier 13 by fastening bolts 15, and the half shaft 6 is respectively connected to the large sun gear 10 and the small sun gear 12. The power input obtained by the output gear 14 is balanced by the torque between the long planetary gear 9 and the short planetary gear 11, and the torque is diverted to the half shaft 6, thereby realizing the differential speed and torque differential functions of the left and right wheels of the vehicle.

[0034] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0035] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, and can be mechanical or electrical connections, or internal connectivity between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dual-motor electric drive assembly system for a pure electric vehicle, characterized in that: include: A power drive system, the power drive system comprising a main drive unit, a main drive unit, a planetary differential assembly (5) and a power disengagement mechanism (3), the main drive unit and the auxiliary drive unit respectively transmit power to the planetary differential assembly through a main drive motor (1) and an auxiliary drive motor (2) and finally output it to a wheel half shaft (6), the output end of the main drive motor (1) is provided with a main drive rotor shaft (7) and the side of the main drive rotor shaft (7) is provided with a main drive input gear (8), the auxiliary drive unit can realize switching between two working modes of an engaged state and a disconnected state, the power drive system has a first power mode and a second power mode, for the first power mode, power output is realized by the main drive unit alone, and for the second power mode, power output is realized by the main drive unit and the auxiliary drive unit being coupled simultaneously.

2. The dual-motor electric drive assembly system for a pure electric vehicle according to claim 1, characterized in that: The auxiliary drive unit is provided with a power disengagement mechanism (3), and an auxiliary drive gear shaft (4) is provided on the side of the power disengagement mechanism (3) and is connected thereto, and the other side is connected to the auxiliary drive rotor shaft (16).

3. The dual-motor electric drive assembly system for a pure electric vehicle according to claim 1, characterized in that: The auxiliary drive gear shaft (4) adopts a double-linked helical gear structure or a double-linked spur gear structure.

4. The dual-motor electric drive assembly system for a pure electric vehicle according to claim 1, characterized in that: The main drive input gear (8) on the drive unit and the main drive rotor shaft (7) are designed as an integral shaft.

5. The dual-motor electric drive assembly system for a pure electric vehicle according to claim 1, characterized in that: The planetary gear differential assembly (5) comprises an output gear (14), a planet carrier (13), a large sun gear (10), a small sun gear (12), a long planet gear (9), a short planet gear (11) and fastening bolts (15).

6. The dual-motor electric drive assembly system for a pure electric vehicle according to claim 5, characterized in that: The output gear (14) is fixed on the planet carrier (13) by means of fastening bolts (15).

7. The dual-motor electric drive assembly system for a pure electric vehicle according to claim 5, characterized in that: The short planetary gear (11) is meshed with the long planetary gear (9) and the small sun gear (12) at the same time, and the long planetary gear (9) is directly meshed with the large sun gear (10) at the same time.

8. The dual-motor electric drive assembly system for a pure electric vehicle according to claim 5, characterized in that: The output gear (14) adopts a double helical gear structure or a double spur gear structure.

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