Process and apparatus for the release of a prestress initially a

Details Process and apparatus for the release of a prestress initially a Process and apparatus for the release of a prestress initially a

1990-07-11

1991-07-09

Hannon, Thomas R.

Bearings

Rotary bearing

Antifriction bearing

2989809, 384476, 384517, F16C 4104, F16C 1950, B21D 5310

Patent

active

050300164

ABSTRACT:
In space vehicles, mechanisms such as ball bearings (14, 14') are subject to an initial preload or prestress enabling them to withstand the vibrations caused by the launch and without leading to any clearance or play. A member (34) made from a shape memory material e.g. makes it possible under the effect of its elongation, to release said preload when the vehicle is in the operational mode. The control of the release can take place by means of a heating resistor (36), whose energization leads to the member (34) clearing its shape change temperature.

REFERENCES:
patent: 3985209 (1976-10-01), Glassow
patent: 4324441 (1982-04-01), Rouverol et al.
patent: 4657412 (1987-04-01), McLarty et al.
patent: 4850719 (1989-07-01), Moseley et al.
patent: 4961654 (1990-10-01), Pangburn et al.

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