The present invention discloses a two-speed rear axle power
system for a
pure electric vehicle, comprising a motor, a
motor shaft, a
clutch, a one-way
clutch, an inner shaft, an outer shaft, a planetary row, a rear sun gear, a rear planetary wheel and an output shaft; the planetary row comprises: a ring gear, a front planetary wheel, a front sun gear, a planetary shaft and a planetary carrier. By controlling the outer race and the inner race of the one-way
clutch to engage and disengage, a two-speed
power switching is formed. The first-speed power path is provided by a
drive motor 1, and passes through the
motor shaft, clutch, outer shaft, front sun gear, front planetary wheel, planetary shaft and planetary carrier in sequence, and is output from the output shaft; the second-speed power will add a path provided by the
drive motor at the same time, and passes through the
motor shaft, clutch, inner shaft, rear sun gear, rear planetary wheel, planetary shaft and planetary carrier in sequence, and is output from the output shaft. This
system simplifies the clutch structure, is simple to control, reduces costs, and realizes the two-speed rear axle power function of the
electric vehicle at the same time.