Dual-motor coupling continuously adjustable variable speed driving system

Abstract

The invention relates to a double-motor coupling continuously adjustable variable speed driving system, which adopts a planet wheel driving mechanism and a turbine worm speed regulation structure, and mainly comprises a main driving motor (1), a speed regulation motor (2), a speed regulation worm assembly (3), a gear ring assembly (4), a planet wheel assembly (5), an output frame shaft (6), an input shaft (7) and a box body (8), the transmission ratio of the planet gear mechanism is changed by adjusting the rotating speed of the adjustable-speed motor (2). A double-motor coupling mode is adopted, continuous change of the transmission ratio of the speed reducer of the electric automobile can be achieved, a driving system needs to meet the requirements for large torque and high rotating speed at the same time, the direct automobile driving power of a single motor is reduced, and it is guaranteed that the driving motor works in an efficient interval all the time; electromechanical efficient integration and high power density of a power driving system of the electric automobile are achieved, and the use efficiency of the driving motor and the power performance of the electric automobile are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicle drive, and particularly relates to a dual-motor coupled continuously adjustable variable speed drive system, which can meet the high-speed and high-torque output requirements of the drive device. Background Art

[0002] With the continuous development of the automotive industry and the continuous increase in the global automobile ownership, a high-power, high-speed, and high-efficiency power drive system has become a key technology for electric vehicles. Limited by in-vehicle energy devices, most current electric vehicles adopt a single-motor plus transmission drive form. The drive system needs to simultaneously meet the requirements of large torque and high speed, and can meet the need for large torque when the vehicle is starting or climbing, i.e., at low speeds, and sufficient power at high speeds. However, if a single motor is directly used to drive the vehicle, in order to meet the large torque and speed range of the vehicle, the motor power will inevitably be large and the motor will work in the low-efficiency area for a long time, resulting in insufficient utilization of power. Summary of the Invention

[0003] The present invention provides a dual-motor coupled continuously adjustable variable speed drive system, which uses the coupled drive mode of the main drive motor and the speed-regulating motor to solve the problem of insufficient utilization of the centralized drive power of a single high-power drive motor, improve the comfort and power performance of electric vehicles, and achieve the efficient drive of the electric drive system under different loads.

[0004] To solve the above technical problems, the present invention provides a dual-motor coupled continuously adjustable variable speed drive system, which is characterized in that it includes a main drive motor (1), a speed-regulating motor (2), a speed-regulating worm assembly (3), a ring gear assembly (4), a planetary gear assembly (5), an output frame shaft (6), and an input shaft (7);

[0005] The output shaft of the main drive motor (1) is connected to the input shaft (7), the speed-regulating motor (2) is connected to the speed-regulating worm assembly (3), and the output shaft of the speed-regulating motor (2) is arranged perpendicular to the output shaft of the main drive motor (1); the internal teeth of the ring gear (11) of the ring gear assembly (4) are meshed with the gears of the planetary gear assembly (5), and the external teeth are meshed with the speed-regulating worm assembly (3). The planetary gear assembly (5) is fixedly connected to the output frame shaft (6), and the planetary gears of the planetary gear assembly (5) are respectively meshed with the external teeth of the input shaft (7) and the internal teeth of the ring gear (11).

[0006] Advantageous Effects: The present invention adopts a dual-motor and mechanical coupling transmission form, reduces the power of a single motor, improves the utilization efficiency of the drive motor, further increases the power density of the electric drive system, and is conducive to the efficient integration of the electric drive system of electric vehicles and high power density.

[0007] The drive system involved in the present invention adopts a dual-motor coupling method, which can achieve continuous variation of the transmission ratio of the electric vehicle reducer, enabling the drive system to simultaneously meet the requirements of large torque and high speed, reducing the power of a single motor directly driving the vehicle, ensuring that the drive motor always operates in the high-efficiency range, facilitating the efficient integration of the mechanical and electrical components of the electric vehicle power drive system and achieving high power density, and improving the utilization efficiency of the drive motor and the dynamic performance of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Schematic structural diagram of the present invention

[0009] Figure 2 Exploded view of the present invention

[0010] Figure 3 Schematic diagram of the ring gear assembly of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] To make the objectives, contents, and advantages of the present invention clearer, the following provides a more detailed description of the specific embodiments of the present invention.

[0012] A dual-motor coupling continuously adjustable speed drive system proposed by the present invention adopts a planetary gear drive mechanism and a worm and worm gear speed regulation structure, and mainly consists of a main drive motor (1), a speed regulation motor (2), a speed regulation worm assembly (3), a ring gear assembly (4), a planetary gear assembly (5), an output frame shaft (6), an input shaft (7), and a housing (8); by adjusting the speed of the speed regulation motor (2), the transmission ratio of the planetary gear mechanism is changed.

[0013] The main drive motor (1) is fixed to the housing (8) by bolts, and the output shaft is connected to the input shaft (7) through a spline.

[0014] The speed regulation motor (2) is fixed to the housing (8) by bolts and is connected to the speed regulation worm assembly (3) through a spline. The output shaft of the speed regulation motor (2) is perpendicular to the output shaft of the main drive motor (1).

[0015] The speed regulation worm assembly (3) is fixed by a worm support front flange (9) and a worm support rear flange (10). The support front flange (9) and the worm support rear flange (10) are installed and fixed to the housing (8) through bolts and bearings and can rotate relative to the housing.

[0016] The ring gear assembly (4) is divided into a ring gear (11) and a ring gear baffle (12). The internal teeth of the ring gear (11) mesh with the gears of the planetary gear assembly (5), and the external teeth mesh with the speed regulation worm assembly (3). The ring gear baffle (12) fixes the ring gear (11) by bolts.

[0017] The planetary gear assembly (5) is fixed to the output frame shaft (6) by the output frame shaft pressing plate (13). The planetary gears of the planetary gear assembly (5) are respectively meshed with the external teeth of the input shaft (7) and the internal teeth of the ring gear (11).

[0018] The output frame shaft (6) is rotatably connected to the housing (8) by means of the output frame shaft flange (14). The output end of the output frame shaft (6) can adopt mechanical connection forms such as splines, flat keys, gears, etc. to be connected to the secondary reduction device, or can also be directly connected to the wheel side system.

[0019] The end of the output frame shaft (6) can be arranged outside the input shaft (7) and is rotatably connected to the input shaft (7) through a bearing to achieve a supporting function.

[0020] The housing (8) includes a housing top cover (16), a housing base (17), etc. The housing top cover (16) is used for installing the ring gear assembly (4) and the planetary gear assembly (5). The housing base (17) is used for fixing and installing the main drive motor (1), the speed regulating motor (2), the speed regulating worm assembly (3), the ring gear assembly (4), the planetary gear assembly (5), the output frame shaft (6), and the input shaft (7).

[0021] Key points of the present invention

[0022] 1. A dual-motor coupled continuously adjustable speed drive system, the dual-motor coupled continuously adjustable speed drive system includes a planetary gear drive mechanism and a worm and gear speed regulating structure. The speed regulating motor adjusts the speed of the ring gear through the worm and gear speed regulating structure to realize the change of the transmission ratio of the planetary gear drive mechanism. The main drive motor realizes the transmission of driving force through the planetary gear assembly. When the speed regulating motor and the main drive motor act simultaneously, the power of the main drive motor and the speed regulating motor is coupled, and the power converges to the variable speed drive mechanism to further realize the continuously adjustable speed of the electric drive system.

[0023] 2. The main drive motor and the speed regulating motor involved in the present invention adopt high-speed permanent magnet synchronous motors. The main drive motor is the power input end of the whole system, and the speed regulating motor is the power source of the speed regulating part. The driving force passes from the main drive motor through the input shaft and the planetary gear assembly, and the torque of the main drive motor is transmitted through the output frame shaft. The power of the speed regulating part passes from the speed regulating motor through the speed regulating worm assembly, and the transmission ratio of the planetary gear drive mechanism is adjusted by changing the speed of the ring gear.

[0024] 3. The speed regulation structure involved in the present invention adopts a worm and worm gear speed regulation mechanism, which is divided into three working modes. In the normal mode, the speed regulation motor does not rotate, the worm and worm gear are self-locking, the ring gear is fixed, and the transmission ratio of the planetary gear drive mechanism is a fixed value. The electric vehicle can balance speed and torque to meet the conventional driving requirements of the vehicle. In the high-speed mode, the speed regulation motor rotates forward, the speed regulation worm assembly meshes with the external teeth of the ring gear, the ring gear rotates in the same direction as the input shaft, and the transmission ratio of the planetary gear drive mechanism gradually decreases as the speed regulation motor speed increases, realizing high-speed output after small-ratio deceleration to meet the high-speed driving requirements of the vehicle. In the strong force mode, the speed regulation motor rotates in reverse, the transmission ratio of the planetary gear drive mechanism gradually increases as the speed regulation motor speed increases, realizing large-torque output after large-ratio deceleration to meet the large-torque requirements for the vehicle to climb slopes at low speeds.

[0025] 4. The planetary gear drive mechanism involved in the present invention adopts a planetary reduction mechanism. In this structure, the inner ring of the ring gear adopts a planetary reduction mechanism, and the external teeth adopt a worm and worm gear mechanism, using the ring gear to realize the power confluence of the main drive motor and the speed regulation motor.

[0026] 5. The drive system involved in the present invention has the ability of regenerative braking. When the vehicle speed is relatively low, the speed regulation motor does not participate in the recovery of braking energy. When braking at a relatively high vehicle speed, the system enters the high-speed mode, and the main drive motor and the speed regulation motor jointly recover braking energy.

[0027] 6. The output frame shaft involved in the present invention can be increased with a secondary reduction mechanism, and the following transmission forms can be adopted for the secondary reduction mechanism: gear transmission, planetary gear transmission, belt transmission, chain transmission.

[0028] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A dual-motor coupled continuously adjustable variable speed drive system, characterized in that: It comprises a main driving motor (1), a speed regulating motor (2), a speed regulating worm assembly (3), a ring gear assembly (4), a planetary gear assembly (5), an output frame shaft (6), and an input shaft (7); The output shaft of the main drive motor (1) is connected to the input shaft (7), the speed regulating motor (2) is connected to the speed regulating worm assembly (3), and the output shaft of the speed regulating motor (2) is arranged perpendicular to the output shaft of the main drive motor (1); the inner teeth of the ring gear (11) of the ring gear assembly (4) are meshed with the gears of the planetary gear assembly (5), and the outer teeth are meshed with the speed regulating worm assembly (3); the planetary gear assembly (5) is fixedly connected to the output frame shaft (6), and the planetary gears of the planetary gear assembly (5) are respectively meshed with the outer teeth of the input shaft (7) and the inner teeth of the ring gear (11).

2. A dual-motor coupled continuously adjustable variable speed drive system according to claim 1, characterized in that: The coupling drive mode of the main drive motor and the speed regulating motor is utilized to realize efficient driving of the electric drive system under different loads.

3. The dual-motor coupled continuously adjustable variable speed drive system according to claim 1, characterized in that: The main drive motor and speed regulating motor adopt high-speed permanent magnet synchronous motor.

4. The dual-motor coupled continuously adjustable variable speed drive system according to claim 1, characterized in that: The main driving motor (1) and the speed regulating motor (2) are both fixed on the box body (8).

5. The dual-motor coupled continuously adjustable variable speed drive system according to claim 1, characterized in that: The output shaft of the main driving motor (1) is connected to the input shaft (7) via a spline.

6. The dual-motor coupled continuously adjustable variable speed drive system according to claim 1, characterized in that: The speed regulating worm assembly (3) is connected to the housing (8) by means of a worm supporting front flange (9) and a worm supporting rear flange (10), and can rotate relative to the housing.

7. The dual-motor coupled continuously adjustable variable speed drive system according to claim 1, characterized in that: The ring gear assembly (4) comprises a ring gear (11) and a ring gear baffle (12), and the ring gear baffle (12) is fixedly connected to the end surface of the fixed ring gear (11).

8. The dual-motor coupled continuously adjustable variable speed drive system according to claim 1, characterized in that: The output frame shaft (6) is rotatably connected to the housing (8) by means of an output frame shaft flange (14); the output end of the output frame shaft (6) is connected to a secondary reduction device, or is directly connected to a wheel side system.

9. The dual-motor coupled continuously adjustable variable speed drive system according to claim 1, characterized in that: It is divided into three working modes. In normal mode, the speed regulating motor does not rotate, the worm gear assembly is self-locking, the ring gear is fixed, and the transmission ratio of the planetary gear assembly is a constant. Electric vehicles can take into account both speed and torque to meet the vehicle's normal driving needs; in high-speed mode, the speed regulating motor rotates forward, the speed regulating worm gear assembly meshes with the outer teeth of the ring gear, the ring gear and the input shaft rotate in the same direction, and the transmission ratio of the planetary gear assembly gradually decreases as the speed regulating motor increases, achieving high-speed output after small-ratio deceleration, meeting the vehicle's high-speed driving needs; in strong mode, the speed regulating motor rotates reversely, and the transmission ratio of the planetary gear assembly gradually increases as the speed regulating motor increases, achieving large torque output after large-ratio deceleration, meeting the vehicle's low-speed climbing and large torque needs.

10. The dual-motor coupled continuously adjustable variable speed drive system according to claim 1, characterized in that: The speed regulating motor adjusts the ring gear speed through the turbine worm speed regulating structure to realize the change of the transmission ratio of the planetary gear drive mechanism. The main drive motor realizes the transmission of driving force through the planetary gear assembly. When the speed regulating motor and the main drive motor act at the same time, the main drive motor and the speed regulating motor are dynamically coupled, and the power flows to the adjustable speed drive mechanism, further realizing the continuous adjustable speed change of the electric drive system.

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