Lubrication system for a mechanism, in particular for a rotary bearing in a spacecraft
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United States of America Patent
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Jul 11, 2000
Grant Date -
N/A
app pub date -
Sep 9, 1998
filing date -
Sep 10, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a lubrication system for a mechanism (27), on-board a spacecraft. It comprises a non pressurized tank (20) communicating with the mechanism (27) via a tube (220). A piston (23) closes the tube (220) while the mechanism is at rest. The piston (23) is controlled by a first spring (5) and by a second, shape memory, spring (24) opposing the latter, which lengthen by thermal effect. A controller (25, 26) supplies this spring with a current (I) to actuate it. An annular element(7), pushed by a cylindrical spring (6), defines a capillarity filled pumping chamber (22). When the temperature of the shape memory alloy (24) falls back below a threshold, the spring (24) recovers its original shape, the first spring (5) pushes back the piston (23) and expels a dose of lubrication fluid (4).
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