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Oil-Free CompressorCompressor pistons moved by eccentric shaft need no lubricants. Compressor has shaft, middle section is eccentric in relation to end sections. Driven by brushless dc motor, shaft turns inner races of set of four cam bearings. Outer cam-bearing races in turn actuate four pistons spaced equally apart, around and along shaft. Each outer bearing race held in position by pressure exerted on it by piston. Because no frictional motion between piston and outer bearing race, lubricant between them unnecessary. Cam bearings themselves contain potted internal lubricant. Originally proposed for use in space, new compressor for refrigerators or freezers does not depend on pool of oil for lubricating its pistons. Operated in any orientation.
Document ID
Document Type
Other - NASA Tech Brief
Fitzjerrell, D. G. (Management and Technical Services Co.)
Belver, T. L. (Management and Technical Services Co.)
Moore, H. E. (Management and Technical Services Co.)
Date Acquired
August 12, 2013
Publication Date
June 1, 1986
Publication Information
Publication: NASA Tech Briefs
Volume: 10
Issue: 2
ISSN: 0145-319X
Subject Category
Report/Patent Number
Distribution Limits
Work of the US Gov. Public Use Permitted.