Compact actuator including resettable force limiting and anti-ba

Details Compact actuator including resettable force limiting and anti-ba Compact actuator including resettable force limiting and anti-ba

1995-06-02

1997-08-12

Lorence, Richard M.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

188134, 74 8915, 744248R, F16H 2702

Patent

active

056556365

ABSTRACT:
A compact ball screw type actuator having both load limiting capability above a pre-determined value and position holding capability at all load values above, below and at the pre-determined value is provided through use of a resettable force limiting assembly acting directly on an element of the ball screw, in conjunction with a friction drag device operating directly upon an input shaft operatively coupled through a crossed-helical gear train to the ball screw. The force limiter utilizes axial force on the ball screw above the pre-determined value for engaging clutch teeth to limit the force applied by the ball screw, or to provide the position holding function and for preventing backdriving of the actuator. For force levels at or below the pre-determined value, the input drag device provides the position holding function.

REFERENCES:
patent: 3367456 (1968-02-01), Bohnhoff
patent: 3497044 (1970-02-01), Kalns
patent: 3542162 (1970-11-01), Kerr
patent: 3596740 (1971-08-01), Nau
patent: 3734253 (1973-05-01), Derossi
patent: 3802281 (1974-04-01), Clarke
patent: 3968705 (1976-07-01), Amano et al.
patent: 4318304 (1982-03-01), Lang
patent: 4459867 (1984-07-01), Jones
patent: 4850458 (1989-07-01), Allan et al.

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