Simple propeller pitch changing mechanism

The utility model discloses a simple propeller pitch changing mechanism, which relates to the technical field of propellers, and comprises a lower shell, the bottom surface of the lower shell is fixedly connected with a servo motor, an output rotating shaft of the servo motor penetrates through the lower shell and extends into the lower shell, the output rotating shaft of the servo motor is fixedly connected with a threaded rod, and the threaded rod is fixedly connected with the lower shell. The outer surface of the threaded rod is sleeved with a threaded ring, the threaded ring is in threaded connection with the outer surface of the threaded rod, two symmetrical first bearings are fixedly embedded in the inner wall of the lower shell, and the inner ring of each first bearing is fixedly connected with a rotating rod. A servo motor can drive a threaded rod to rotate, a threaded ring drives a linkage plate to move upwards, the linkage plate can drive a movable rod to move upwards, the movable plate drives two r