At present, the aging of the global population is particularly prominent, and the development of special disabled groups brings the diversified needs of the elderly health industry and special group industry market. How to provide corresponding products and services for this special group has become a topic of common concern for health industry practitioners and all sectors of society. With the improvement of residents' living standards, people have put forward higher requirements for the quality, performance and comfort of products. In addition, with the accelerated pace of urban life, children spend less and less time at home taking care of the elderly and patients. It is inconvenient for the elderly and the disabled to use manual wheelchairs, so they can not get good care. How to solve this problem has become a topic of increasing concern in the society.

With the birth of electric wheelchair, people see the hope of rebirth. The elderly and disabled friends can no longer rely on the help of others. They can walk independently by operating an electric wheelchair, making their life and work easier and more convenient.

In the electric wheelchair, the rear axle of electric vehicle is an indispensable part. The rear axle of electric vehicle has the effect of secondary speed change, which can adapt to different road power. It is roughly based on the inner swivel set in the rear axle housing. The utility model is characterized in that a speed change component connected with the motor and a shift control component connected with the speed change component are set on the rear axle. It can save costs and improve the power efficiency and driving distance of electric vehicles.