| 摘要 |
An improved hinge assembly is disclosed that is particularly apt for use with deployable trusses utilized on satellites and other spacecraft. In one arrangement, the inventive hinge assembly comprises a tapered roller bearing assembly having tapered rollers angled towards a hinge axis, and a needle roller thrust bearing assembly positioned radially about at least a portion of the tapered roller bearing assembly to yield a compact and lightweight bearing arrangement, while providing satisfactory radial and axial loading bearing characteristics. An axial preload assembly may also be employed with the roller bearing assemblies in the invention to yield enhanced hinge stiffness and repeatability benefits. Such characteristics are of particular importance with deployable spacecraft truss assemblies for supporting instrumentation during orbit. An additional needle roller bearing assembly may be included at an axially spaced position from the tapered roller bearing assembly to provide overload protection (e.g., for ground-based handling and on-orbit acceleration/deceleration), and thereby allowing for a reduction in the size/weight of the primary tapered roller and needle roller thrust bearing assemblies.
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