Rear axle electric power drive for electric vehicles

Abstract

The invention discloses a rear axle electrodynamic force drive device of an electric vehicle. The drive device comprises a reducer shell, wherein the reducer shell is provided with two supports, the two supports support a differential shell, a second driven gear is fixed on the differential shell, a transmission shaft is arranged in the differential shell, a first driven gear and a second drive gear are fixed on the periphery of the transmission shaft, the second drive gear is meshed with the second driven gear, the reducer shell is provided with an end face, a cavity is formed on the end face, a shaft hole is formed in the bottom of the cavity, one end of an alternating current motor stator core is connected with the end face, the other end of the alternating current motor stator core is connected with a rear end cover, the rear end cover, the alternating current motor stator core and the reducer shell are fixed through bolts, one end of a rotor shaft of an alternating current motor supports on the rear end cover, the other end of the rotor shaft of the alternating current motor penetrates through the shaft hole to support on the reducer shell, the first drive gear is fixed on the rotor shaft of the alternating current motor, and the first drive gear is meshed with the first driven gear. The electrodynamic force drive device realizes stepless speed regulation, shifting impact is eliminated, and the heat dissipation of a drive motor is ensured.

Description

technical field [0001] The invention relates to the field of rear axles of electric vehicles, in particular to an electric drive device for rear axles of electric vehicles. Background technique [0002] The driving devices of existing electric vehicles are usually the following two types: one is a driving motor plus a clutch plus a two-speed transmission mechanism. This kind of driving device must be equipped with a clutch structure, the transmission loss is large, the system efficiency is low, and the structure is complicated. Replacement of clutch parts is costly; although this driving device adopts two gears, the speed ratio between the two gears has a large difference, the impact is too large during the gear shifting process, and the ride comfort is reduced. Another driving device directly connects the driving motor to the multi-speed transmission mechanism. Although this driving device can realize multi-speed transmission, it still uses a common gear transmission. The ...

AI Technical Summary

Problems solved by technology

[0002] The driving devices of existing electric vehicles are usually the following two types: one is a driving motor plus a clutch plus a two-speed transmission mechanism. This kind of driving device must be equipped with a clutch structure, the transmission loss is large, the system efficiency is low, and the structure is complicated. Replacement of clutch parts is costly; although this driving device adopts two gears, the speed ratio between the two gears is quite different, the impact is too large during the gear shifting process, and the ride comfort is reduced

Another driving device directly connects the driving motor to the multi-speed transmission mechanism. Although this driving device can realize multi-speed transmission, it still uses a common gear transmission. The speed ratio is poor, there is an impact during the shifting process, the ride comfort is low, and any output speed cannot be achieved

[0003] At present, the DC motors used in the driving devices of electric vehicles have not yet been recorded as using AC motors as the driving motors of electric vehicles. The brushes and commutators of DC motors are worn, so there is a life limit, and the manufacturing cost of DC motors is relatively high. High, noisy, conventional power DC motors have armature windings, and the speed is low, generally below 3000rpm

Moreover, the drive motor and the transmission device of the above two drive devices are integrated, and the drive motor and the transmission device must be connected through assembly. When designing an electric vehicle, the installation position and occupied space of the drive motor and the transmission device must be considered separately, resulting in electric vehicles. The overall design of the vehicle is more difficult, which is not conducive to the overall design of electric vehicles

Moreover, the driving motors of existing electric vehicles all adopt closed motors, and the motors are closed by a closed casing, which requires an independent fan to dissipate heat, takes up more space, and consumes more electric energy

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