LEAD SCREW ACTUATOR WITH TORSIONAL ANTI-BACKLASH NUT

摘要

A linear actuator assembly (10), comprising a rotating lead screw (11) with external threads; and a nut assembly with threads engageable with the external threads of the lead screw (11); and a guide tube (13) having a hollow interior portion with at least one internal surface (51,52,53). The lead screw (11) and nut assembly are located within the hollow interior portion of the guide tube (13), and the guide tube (13) is configured to prevent the nut assembly from rotating with the lead screw (11). The nut assembly translates in a linear direction within the guide tube (13) as the lead screw (11) rotates. A portion of the nut assembly, such as a wedge (25), is radially biased against the at least one internal surface (51,52,53) of the guide tube (13) to minimize torsional backlash of the actuator assembly.