Lubrication system for a mechanism, in particular for a rotary b

Details Lubrication system for a mechanism, in particular for a rotary b Lubrication system for a mechanism, in particular for a rotary b

1998-09-09

2000-07-11

Graysay, Tamara L.

Lubrication

Lubricators

Gravity feed

184 79, 222333, 222378, 137807, 417417, F16N 2900

Patent

active

060858710

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).

REFERENCES:
patent: 2301130 (1942-11-01), Valley
patent: 2540523 (1951-02-01), Horn
patent: 2996149 (1961-08-01), Walker
patent: 5630709 (1997-05-01), Bar-Cohen
patent: 5782616 (1998-07-01), Yoo

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