Shifting apparatus for electric vehicle

摘要

A shifting apparatus for an electric vehicle includes: a sun gear freely rotated on a motor driving shaft of the electric vehicle; a brake device fixed to a transmission housing and fixing the sun gear at the time of being driven; a carrier fixed to the motor driving shaft and moving a planetary gear along the sun gear; a ring gear rotated by the movement of the planetary gear while enclosing the planetary gear; an output gear connected to the ring gear and connected to the motor driving shaft by a one-way clutch; and a controlling part having a first speed mode and a second speed mode and transferring driving force directly to the output gear through the one-way clutch at the time of the first speed mode and driving the brake device at the time of a change to the second speed mode to fix the sun gear.

主权项

1. A shifting apparatus for an electric vehicle, comprising:
a sun gear freely rotating about a motor driving shaft of the electric vehicle; a brake device fixed to a transmission housing and selectively fixing the sun gear while the motor is driven; a carrier fixed to the motor driving shaft and supporting a planetary gear engaging the sun gear; a ring gear engaging the planetary gear while enclosing the planetary gear; an output gear connected to the ring gear and connected to the motor driving shaft by a one-way clutch; and a controller having a first speed mode and a second speed mode, wherein driving force is directly transferred to the output gear through the one-way clutch in the first speed mode, wherein the brake device is engaged in the second speed mode fixing the sun gear with respect to the transmission housing thereby allowing a rotation speed of the output gear to be increased due to the rotation of the ring gear by the planetary gear, and wherein the motor driving shaft further includes a dog clutch disposed between the motor driving shaft and the output gear to allow the motor driving shaft to selectively connect with the output gear.