Self-propelled movable object with a self-tightening rotor

摘要

Systems, methods, and devices for propelling self-propelled movable objects are provided. In one aspect, a rotor assembly (100) for a self-propelled movable object comprises: a hub (10) comprising a first fastening feature (11, 311); a drive shaft comprising a second fastening feature (411) and directly coupled to the hub (10) by a mating connection of the first and second fastening features, wherein the drive shaft is configured to cause rotation of the hub such that the mating connection of the first and second fastening features is tightened by the rotation; and a plurality of rotor blades (20) coupled to the hub and configured to rotate therewith to generate a propulsive force.