Gear shifting mechanism

The utility model provides a gear shifting mechanism which enables a gear shifting swing arm to swing to drive a gear shifting fork shaft to move front and back, enables assembly of an angular displacement sensor to be fast and convenient, and ensures reliable monitoring of corresponding gears. The linear driving mechanism comprises a driving motor, a ball screw and a shifting block; a shift swing arm; a shift fork shaft; a shift fork; and an angular displacement sensor; a driving head is arranged at one end of the gear shifting swing arm in the length direction, a rotating shaft of a rotating gear is fixedly arranged at the other end of the gear shifting swing arm in the length direction, the rotating shaft can only rotate to work, the driving head is embedded in an inner groove of the shifting block, and the shifting block drives the driving head to move to work. A C-shaped blocking strip is fixedly arranged on the gear shifting fork shaft, the corresponding end of the gear shifting swing arm in the length