Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1985-10-28
1987-01-20
Husar, Cornelius J.
Machine element or mechanism
Gearing
Directly cooperating gears
74 8915, 74661, 74665GD, 192 489, 192 94, 244 75R, F16H 100
Patent
active
046372725
ABSTRACT:
There are many requirements for an actuator where safety considerations dictate several independent means of actuation. This invention pertains to an actuator utilizing a single ballscrew with drive units associated therewith to provide a level of redundancy which permits full performance with any one credible failure and emergency performance with any two credible failures and, thus, the actuator is dual failure tolerant with full performance after any two credible failures.
The ballscrew actuator has a pair of rotatable ballnuts associated with a ballscrew and carried by separate housings movable toward and away from each other. The ballscrew is twice the length of the desired actuating movement, with one-half of the length of the ballscrew being stored in each housing. Primary and backup drive units each having a drive motor are carried by one housing and each have a worm gear set and a selectively engageable clutch for selective driving of the first ballnut. A second housing mounts an emergency drive unit having a drive motor which, through a worm gear set, drives a second ballnut. Normal operation of the actuator is derived from operation of either the primary or backup drive units and, when there is a failure in the operation of both of these drive units, the emergency drive unit can be operated to assure movement of the actuator for safe positioning of a device moved by the actuator, such as the payload and support structure of a space vehicle.
REFERENCES:
patent: 2471857 (1949-05-01), Bleakney et al.
patent: 2569542 (1951-10-01), Skidmore et al.
patent: 2660026 (1953-11-01), Geyer
patent: 2660029 (1953-11-01), Geyer
patent: 2692661 (1954-10-01), Bertsch et al.
patent: 2740302 (1956-04-01), Keyser
patent: 2869386 (1959-01-01), Hoover
patent: 3483765 (1969-12-01), Fornataro
patent: 3766790 (1973-10-01), Weir
patent: 4179944 (1979-12-01), Conner
patent: 4199999 (1980-04-01), Metz
patent: 4429592 (1984-02-01), Stevenson
patent: 4459867 (1984-07-01), Jones
Senasack, Jr. Henry E.
Teske Duane R.
Wilkins Mark
Fischetti Joseph A.
Husar Cornelius J.
Sundstrand Corporation
LandOfFree
Ballscrew actuator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ballscrew actuator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ballscrew actuator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2129141