Jam tolerant linear actuator

Details Jam tolerant linear actuator Jam tolerant linear actuator

1991-08-01

1992-09-08

Herrmann, Allan D.

Machine element or mechanism

Gearing

Directly cooperating gears

74 8915, 744248R, F16H 2522

Patent

active

051448513

ABSTRACT:
The invention is directed to a jam tolerant ballscrew actuator. The ballscrew actuator is driven through a differential via plural power paths therein. A first of these differential power paths is drivingly coupled to a reciprocating dual ballscrew assembly by way of a rotatable ballnut. A second of the differential power paths is coupled to the dual ballscrew assembly via a rotatable hub having a splined opening therethrough. A reciprocating sleeve having a splined portion engages the sleeve shaft to reciprocate therethrough and be rotated by the rotatable hub. The sleeve shaft additionally includes a rotatable sleeve ballnut portion that drivingly cooperates with the dual ballscrew assembly. The reciprocating rotatable sleeve provides the ballscrew actuator output. The rotatable ballnut and the rotatable sleeve ballnut have equal but opposite leads which provide an axial motion summing characteristic for the dual ballscrew assembly. An internal jam of one of the ballscrews, in the differential, or in any bearing, simply alters the power flow path through the differential and the dual ballscrew assembly but does not affect the overall mechanical advantage or speed ratio of the actuator.

REFERENCES:
patent: 3766790 (1973-10-01), Weir
patent: 4603594 (1986-08-01), Grimm
patent: 4637272 (1987-01-01), Teske et al.
patent: 4679485 (1987-07-01), Nelson et al.
patent: 4745815 (1988-05-01), Klopfenstein

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