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Title: Low backlash direct drive actuator

A low backlash direct drive actuator is described which comprises a motor such as a stepper motor having at least 200 steps per revolution; a two part hub assembly comprising a drive hub coaxially attached to the shaft of the motor and having a plurality of drive pins; a driven hub having a plurality of bores in one end thereof in alignment with the drive pins in the drive hub and a threaded shaft coaxially mounted in an opposite end of the driven hub; and a housing having a central bore therein into which are fitted the drive hub and driven hub, the housing having a motor mount on one end thereof to which is mounted the stepper motor, and a closed end portion with a threaded opening therein coaxial with the central bore in the housing and receiving therein the threaded shaft attached to the driven hub. Limit switches mounted to the housing cooperate with an enlarged lip on the driven hub to limit the lateral travel of the driven hub in the housing, which also acts to limit the lateral travel of the threaded shaft which functions as a lead screw.
  1. (Oakland, CA)
Issue Date:
OSTI Identifier:
United States of America as represented by United States (Washington, DC) LLNL
Patent Number(s):
US 5359246
Contract Number:
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
backlash; direct; drive; actuator; described; comprises; motor; stepper; 200; steps; revolution; hub; assembly; comprising; coaxially; attached; shaft; plurality; pins; driven; bores; alignment; threaded; mounted; opposite; housing; central; bore; therein; fitted; mount; closed; portion; coaxial; receiving; limit; switches; cooperate; enlarged; lip; lateral; travel; functions; lead; screw; coaxially mounted; stepper motor; assembly comprising; central bore; lead screw; coaxially attached; bore therein; direct drive; motor mount; backlash direct; drive actuator; /310/464/