Spacecraft component rotation means

Aeronautics and astronautics – Spacecraft – With payload accommodation

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308184R, 308189A, 310 91, B64G 110, H02K 500

Patent

active

040761916

ABSTRACT:
A bearing and drive mechanism to rotate precisely spacecraft components, in particular, an array of solar panels. A drive shaft in such a mechanism designed for long-life capability is required to have high stiffness in addition to axial and radial constraints for precise rotation relative to a fixed housing. A preloaded pair of duplex, coacting angular contact ball bearings mounted between the shaft and housing provides axial and radial shaft constraint. A single bearing, mounted on an axially compliant diaphragm, is preloaded by resiliently flexing the diaphragm. The preloaded single bearing provides a radial constraint and thus shaft support at the mounting of the single bearing, this additional support increasing the stiffness of the shaft against moments and forces imposed on the shaft. The compliant diaphragm permits axial thermal deflections of the shaft relative to the housing, such deflections caused, under temperature changes, by the difference in thermal expansion properties of the shaft and housing.

REFERENCES:
patent: 2859033 (1958-11-01), Rose
patent: 2885583 (1959-05-01), Zunick et al.
patent: 3148846 (1964-09-01), Newton
patent: 3549220 (1970-12-01), Robinson et al.
patent: 3668446 (1972-06-01), Hoyler
patent: 3777195 (1973-12-01), Potter
patent: 3947079 (1976-03-01), Anderson
Veillette; L. J., Highlights of a Brushless Direct-Drive Solar Array Control Sys. Design, Presented at P.C.S. Conf., Apr. 20-21, 1970.

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