Two-speed transmission system and vehicle

A vehicle, wherein the vehicle comprises front wheels, rear wheels, a vehicle body connected between the front wheels and the rear wheels, and a two-speed transmission system, wherein the two-speed transmission system comprises:

• a first fixed gear, sleeved on a first shaft and fixedly connected to the first shaft;
• a first floating gear, sleeved on a second shaft, wherein the first floating gear can rotate relative to the second shaft, and the first fixed gear and the first floating gear are permanently engaged;
• a first connection mechanism, fastened on the second shaft and configured to implement connection or disconnection between the first floating gear and the second shaft;
• and
• a one-way clutch, wherein the one-way clutch is located between the first floating gear and the first connection mechanism;
• an inner surface of the one-way clutch is connected to the first floating gear;
• an outer surface of the one-way clutch abuts against the first connection mechanism;
• when the first floating gear rotates relative to the first connection mechanism in a rotation direction, the first floating gear and the first connection mechanism can implement differential rotation by using the one-way clutch;
• and when the first floating gear rotates relative to the first connection mechanism in another rotation direction, the one-way clutch is locked so that the first floating gear and the first connection mechanism are relatively static and rotate at a same rotation speed to transmit first-gear power.