| 主权项 |
1. An improved structure of linear actuator, comprising:
an actuator comprising a hollow holder frame defining therein an accommodation chamber, a gear set mounted in said accommodation chamber, said gear set comprising a driven gear, said driven gear comprising a gear shaft and at least one friction portion at the periphery of said gear shaft, a one-way bearing mounted on said gear shaft for rubbing against said friction portion with an inner race thereof to brake said driven gear from reverse rotation, a driver mounted outside said hollow holder frame and adapted for driving said gear set, and a transmission mechanism disposed outside said hollow holder frame and coupled to said gear set, said transmission mechanism comprising a lead screw coaxially coupled to and rotatable by said gear shaft of said driven gear and a retractable tube assembly coupled to said lead screw and movable by said lead screw between an extended position and a received position; and a stopping mechanism mounted in said accommodation chamber of said actuator, said stopping mechanism comprising a thrust bearing coupled to said gear shaft of said driven gear and stoppable against said inner race of said one-way bearing to bear an axial thrust load. |
