Method and device for releasing a preload initially applied to a mechanism such as a rolling bearing on board a spacecraft

摘要

In spacecraft, the mechanisms such as ball bearings 14, 14' are subjected to an initial preload allowing them to withstand the vibrations produced by the launch, without giving rise to play. A member 34 made from a shaped memory material makes it possible, for example under the effect of its extension, to release this preload when the craft is in operational mode. The release command may be effected, in particular, by means of a heating element 36 the powering of which makes the member 34 pass beyond its shape-change temperature. IMAGE