Dual-motor drive axle for electric automobile

Abstract

The invention discloses a dual-motor drive axle for an electric automobile. The dual-motor drive axle comprises a high-speed drive motor, a low-speed drive motor, a high-speed drive locking device, alow-speed drive locking device, a single-stage planetary gear set, a differential mechanism, a left half axle and a right half axle. The high-speed drive locking device, the high-speed drive motor, the single-stage planetary gear set, the low-speed drive motor and the low-speed drive locking device are coaxially mounted in sequence; the single-stage planetary gear set is connected with the differential mechanism; the differential mechanism is respectively connected with the left half axle and the right half axle; and the high-speed drive locking device and the low-speed drive locking device are closed or released, so that the drive axle realizes any one of a high-speed driving mode, a low-speed driving mode, a combined driving mode, a reverse gear mode, a neutral gear mode and a parking mode. The gear shifting response is quick, the structure and the control are simple, the reliability is high, the switching energy consumption is low, the assembly transmission efficiency is high, the cost is low, the cost performance is higher, and the potential market competitiveness is stronger.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a dual-motor drive axle for electric vehicles. Background technique [0002] With the continuous development of society and vehicle engineering technology, the number of automobiles is increasing, which has caused great pressure on the environment and energy. In order to solve the above problems, there is an urgent need for major innovations in vehicle engineering drive technology, one is hybrid technology, and the other is pure electric technology. The above two technologies mainly involve the innovation of the vehicle transmission system. One is to introduce energy storage devices, and the other is to introduce electric drive devices, such as motors. [0003] In the current pure electric drive technology, most vehicles use motors and fixed-ratio gearboxes to drive vehicles, which can meet the requirements of low-speed electric vehicles in some areas to a certain extent. Howeve...

AI Technical Summary

Problems solved by technology

However, the main problems faced by the research and development of automatic transmission technology for electric vehicles are: 1. The input speed is nearly three times higher than that of traditional fuel vehicles (the input speed of traditional fuel vehicles is mostly concentrated within 3000rpm, and the motor speed of electric vehicles is generally above 8000rpm ), resulting in qualitative changes in gearbox efficiency, shifting methods, and lubrication methods, and traditional gearbox technology has been difficult to adapt to; 2. Traditional fuel vehicles all have an idling working state, so the shifting hydraulic pump can provide the lowest shifting pressure. However, the motor of an electric vehicle gradually increases its speed from 0 speed to the specified speed, and the traditional hydraulic shift technology that has been formed for nearly 100 years is no longer applicable.

3. The overload torque of the motor is large and the acceleration is large, and the input torque of the gearbox is much larger than that of traditional fuel vehicles, which makes it difficult to match the shifting clutch components

4. Traditional vehicles use mechanical brakes, and there is no requirement for energy recovery; however, electric vehicles need to maximize the recovery of braking energy as much as possible, which makes it difficult to control the braking and shifting of gearboxes

5. Compared with traditional vehicles, electric vehicles have extremely high requirements on the transmission efficiency of automatic transmissions, which makes the structural design of automatic transmissions difficult

6. It is difficult to deal with a series of problems such as high-frequency vibration, self-excited vibration, noise, impact, fatigue damage, and fretting wear caused by high-speed motor

7. The equivalent axial width is small, that is, the automatic gearbox needs to be designed thinner to leave a better space for the axial size of the motor, resulting in a huge equivalent load of the tooth width and difficult design

[0005] In summary, although the above three solutions each solve some of the problems of automatic transmissions for electric vehicles, it is difficult to truly meet the needs of electric vehicles

At present, electric vehicles have technical problems such as slow shift response, complex structure and control, low reliability, high switching energy consumption, low assembly transmission efficiency, and high cost.

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