Electric actuator assembly

An electric actuator assembly comprising:

• an main actuator including a housing which comprises an accommodation chamber therein and two openings located in opposing top and bottom sides thereof, a gear set mounted in said accommodation chamber inside said housing, said gear set comprising a drive gear which contains a gear shaft axially and concentrically extended out of two opposite sides thereof and at least one stepped friction portion located on the periphery thereof, a power drive installed for rotating said gear set, a transmission mechanism comprising a lead screw coupled to said gear set, and an extension rod mated to said lead screw and linearly movable upon rotation of said lead screw;
• and
• a one-way bearing mounted in said accommodation chamber inside said housing of said main actuator, said one-way bearing consisting of an inner race fitted to said gear shaft of said drive gear, an outer race surrounding said inner race, and a backstop mechanism mounted in between, said inner race comprising a flat contact surface located at a top side thereof for abutting against said at least one stepped friction portion;
• Wherein said power drive rotating said gear set to move said extension rod for lifting a load, said inner race of said one-way bearing is rotated by said gear set relative to said outer race of said one-way bearing in one direction;
• when the driving power being off, said at least one stepped friction portion of said gear set is abutted against said flat contact surface of said one-way bearing to produce a braking effect.