Drive axle assembly of variable-speed electric vehicle

Abstract

The invention discloses a drive axle assembly of a variable-speed electric vehicle. The drive axle assembly comprises a transmission, a differential mechanism assembly and a clutch, wherein the transmission comprises a first shaft, a second shaft and a middle shaft, wherein the axis of the first shaft and the axis of the second shaft are located on the same straight line, the second shaft is inserted into the first shaft, the middle shaft is located below the first shaft and the second shaft, and a large gear of a reduction gear set on the middle shaft is connected with a primary reduction main gear of the second shaft; a second-stage speed reducing driven gear on the differential mechanism assembly is connected with a small gear of the speed reducing gear set on the middle shaft, and thefirst shaft is connected in an clutch internal gear of the clutch. According to the assembly, the structure is adopted by the drive axle assembly of the variable-speed electric vehicle, so that the using performance of the electric vehicle is effectively improved, so that the structure of the driving axle is compact, the driving axle can adapt to multiple road conditions, and the endurance mileageof the whole vehicle is increased.

Description

technical field [0001] The invention relates to the technical field of rear axle structures of electric vehicles, in particular to a drive axle assembly of a variable-speed electric vehicle. Background technique [0002] The transmission is a mechanism used to change the speed and torque of the engine, also known as the gearbox. Speed ​​changer is made up of speed change transmission mechanism and operating mechanism. Most of the transmission mechanisms are driven by ordinary gears, and some are driven by planetary gears. [0003] At present, the drive axle of electric new energy vehicles on the market, one is that the motor directly drives the bipolar reducer, that is, a single output speed ratio, and then transmits to the half shaft through the differential to drive the vehicle. The other is that the motor passes through the gearbox, and the gearbox drives the final drive through the transmission shaft, and then transmits to the half shaft through the differential to dri...

AI Technical Summary

Problems solved by technology

[0005] 1. The rear axle of the double-stage reducer directly driven by the motor has high requirements on the performance of the motor because the speed ratio is fixed, so the motor has high power, large volume and weight, high cost and high energy consumption, which is not conducive to energy saving

[0006] 2. The climbing ability is poor, and the driver cannot change the speed ratio according to the road conditions in the face of complex road conditions, such as mountainous roads and continuous undulating roads, etc., which cannot be handled freely, and is not suitable for long-distance driving.

[0007] 3. The speed is low and cannot meet the high-speed road conditions

For a single speed ratio, it is difficult to satisfy both starting torque and high-speed road conditions.

[0008] 4. In the continuous long-distance normal driving under actual road conditions, the motor mostly runs at high speed, the noise is loud and a lot of heat is generated, a large part of the electric energy is converted into heat energy and wasted, and only a part of the electric energy is converted into effective power. Low, the motor is easy to overheat, and it is easy to cause an alarm to stop

At present, water-cooled motors can be selected to replace ordinary motors, but the cost will increase a lot

[0009] 5. A single speed ratio cannot take into account both vehicle speed and torque

If the high speed is satisfied, the torque cannot be achieved; if the torque is large, the vehicle speed cannot be satisfied; if both are to be considered, the only way to increase the power of the motor is to waste energy, but it is difficult to increase the load capacity of the vehicle

[0010] 6. With drive shaft and drive axle, the layout of the battery pack of the whole vehicle is inconvenient. If you want to have a speed change function, the structure is more complicated and the cost is higher

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