Planetary gear variable speed transmission device for electric automobile

The utility model provides a planetary gear variable speed transmission device for an electric automobile, and belongs to the technical field of automobiles. The problems of low universality and speed variation stability of the conventional planetary gear variable speed transmission device for the electric automobile are solved. The planetary gear variable speed transmission device for the electric automobile is arranged between a motor and a differential mechanism, and comprises a shell, an input shaft, an output shaft, a sun gear connected to the input shaft, and a planetary carrier which can be connected with the output shaft. A plurality of planetary gears are connected to the planetary carrier, and are meshed with the sun gear. The variable speed transmission device also comprises gear rings, wherein the gear rings are arranged on the shell and meshed with the planetary gears, and can rotate relative to the shell. The planetary carrier is connected with the input shaft through a clutch. A brake mechanism capable of making the gear ring static relative to the shell is arranged outside each gear ring. By the planetary gear variable speed transmission device for the electric automobile, two gears of the electric automobile are shifted by a planetary gear system, so that the driving performance of the electric automobile is improved.