Electric vehicle hub drive device

Abstract

The invention provides an electric vehicle hub drive device which comprises a main supporting shaft, a motor mounted in the main supporting shaft and a planetary reducing mechanism mounted in the main supporting shaft. The planetary reducing mechanism comprises a sun wheel, a planetary wheel set, planetary carriers and a central wheel circumferentially fixed to the main supporting shaft. The transmission ratios of a first planetary wheel and a second planetary wheel are different, so that wheel shafts of the first planetary wheel and the second planetary wheel rotate around the fixed planetary carriers to drive a hub to rotate, and by arranging the central wheel and the planetary wheel set, a motor direct drive device which is small in weight and simple and compact in structure can be conveniently achieved. The electric vehicle hub drive device is large in reduction ratio and transmission ration and good in drive performance and meets the use requirement that the mounting space of the electric vehicle hub drive device is narrow, and dismounting, mounting and repair are facilitated due to modularized design. The double planetary carriers simultaneously output torque, so that output power is stable.

Description

Technical field [0001] The invention relates to the field of electric vehicles, in particular to an electric wheel hub driving device. Background technique [0002] There are two driving forms of electric vehicles: direct motor drive and drive with wheel-side reducer. The biggest feature of the direct drive form of electric motor is that the power, transmission and braking devices are integrated into the hub, so the mechanical part of the electric vehicle is greatly improved. Simplified, it can also realize a variety of complex driving methods. At the same time, the in-wheel motor can realize differential steering similar to crawler vehicles through the different speeds of the left and right wheels or even reverse rotation, which greatly reduces the turning radius of the vehicle, which can almost be achieved under special circumstances. In-situ steering; while the electric wheel hub drive device in the prior art has a complex structure, large volume and heavy weight, and is not s...

AI Technical Summary

Problems solved by technology

[0002] There are two driving forms of electric vehicles: motor direct drive and drive with wheel reducer. The biggest feature of the motor direct drive form is that the power, transmission and braking devices are integrated into the wheel hub, so the mechanical parts of the electric vehicle are greatly reduced. Simplification can also realize a variety of complex driving methods. At the same time, the wheel hub motor can realize differential steering similar to a tracked vehicle through different speeds or even reverse rotation of the left and right wheels, which greatly reduces the turning radius of the vehicle. In special cases, it can almost be realized. Steering in situ; while the electric wheel hub driving device in the prior art has complex structure, large volume and heavy weight, it is not suitable for the narrow installation space of the electric wheel hub driving device. At the same time, the driving performance is poor and the reduction ratio is small. And it is inconvenient to install and disassemble

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