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Experimental research of roller screw for parallel structure precision mechanisms for space application


S.O. Boyko – Design Engineer, JSC Academician M.F. Reshetnev «ISS» (Zheleznogorsk)
R.P. Silivanov – Design Engineer, JSC Academician M.F. Reshetnev «ISS» (Zheleznogorsk)
A.V. Lekanov – Ph. D. (Eng.), Associate Professor, Deputy Director of the Industrial Center for Large-sized Foldable Mechanical Structures, JSC Academician M.F. Reshetnev «ISS» (Zheleznogorsk)
V.A. Levko – Dr. Sc. (Eng.), Professor, Reshetnev Siberian State Aerospace University (Krasnoyarsk)

Significant increase of satellite structural components size leads to appearance of features of their relative position fine adjustment that is a result of separated masses and linking structural elements site separation. All structural components are affected by different space factors, including temperature impact which leads to changing of satellite structure optimal geometric disposition as a result of deformations. In order to provide fine adjustment six-degree-of-freedom adjustment devices, based on precision linear actuators, are used.
Linear actuators, which are used for adjustment device, must have high precision and stiffness, ordinary structure, low mass and di-mensions, high reliability and possibility of space application. Linear drive is vital component of mechanical part of linear actuator. It is responsible for electric motor rotary motion to linear motion of output shaft transmission.
Planetary roller screw is the most perspective linear drive type. In the linear actuator, based on this drive, it is possible to reach axial displacement of nut relatively to screw equal 0.001…0.002 mm with minimal backlash.
As a result of the development work a planetary roller screw with separated nut was developed and produced by ISS-Reshetnev Company. The roller screw consists of screw (diameter is 12 mm), separated nut, threaded rollers, synchronizing gears, retainers, C rings and distance washer. The drive has high axial stiffness, minimal backlash and low transmission error in comparison with ordinary screw-nut gear due to plurality of contact points, possibility of backlash elimination, preload in the thread mesh of rollers, screw and nut.
Experimental survey is carried out in accordance with tests program and methodology developed by authors with the object of planetary roller screw parameters control in normal conditions, under high and low temperature impact (±70°С), after vibration load impact (in accordance with loads arising in process of a satellite launch) and after life test (100 000 cycles). During the tests technical characteristics listed below was defined: transmission accuracy (no more than ±0.003 mm), repeatability (no more than ±0.0008 mm), axial stiffness (better than 1•107 H/m).
Experimental survey of planetary roller screw with separated nut developed and produced in Academician M.F. Reshetnev Information Satellite Systems demonstrates that the drive is on the one level with world analogs taking into account its technical characteristics. As a result, relative position fine adjustment of telecommunication satellite structural components can be reached by means of multi-degree-of-freedom mechanisms based on developed roller screw. Moreover, it is possible to create range of roller screw drives for Russia space branch using background which is got during the process of design, producing and tests.

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