Self-locking drive and linear actuator

A self-locking drive, comprising:

• a housing and a drive shaft for outputting a driving force, wherein:
• an endcap is provided at an end portion of the housing;
• a self-locking mechanism configured to apply a self-locking force to the drive shaft is provided in the endcap;
• the self-locking mechanism comprises a friction seat sleeved over the drive shaft and rotatable synchronously with the drive shaft, and a friction ring mounted in the endcap and secured to the endcap, an interference-fitting surface of the friction seat and an interference-fitting surface of the friction ring facing each other in a radial direction perpendicular to a rotation axis of the drive shaft, the interference-fitting surface of the friction seat being interference-fitted to the interference-fitting surface of the friction ring to enable self-locking of the self-locking mechanism to the drive shaft in both (i) a first rotary direction about the drive shaft and (ii) a second rotary direction about the drive shaft, the second rotary direction being opposite to the first rotary direction;
• and
• a first recess and a second recess are formed in the drive shaft, the friction seat is between the first recess and the second recess, a first snap spring is snap-fitted in the first recess, a second snap spring is snap-fitted in the second recess, the first snap spring and the second snap spring axially positioning the friction seat relative to the drive shaft.