Backup clutch for magnetic gear operates only in case of slippage. Contacting a pin arrangement in the driven gear, the clutch provides extra force for continuing output. It does not interfere with normal, noncontact action

Shefke, R. A.

English

NASA Technical Reports Server

Drive Pin 
N-Magnet 
Output
Magnet 
iput
No Contact During S-Magnet Positioned 
Normal Operation	 Over N-Magne 
Drive Pin 
Permanent Magnets 
January 1970	 Brief 70-10087 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Magnetic Gear Backup 
A design concept of a backup clutch for a magnetic 
gear is shown in the figure. During normal operation 
the backup clutch does no work, but in case of slip-
page it contacts a pin arrangement in the driven gear, 
providing extra force for continuing output. 
This concept is novel in that it provides a simple 
easily constructed safety clutch for a magnetic gear-
ing system, which does not interfere with normal, 
noncontact action. The mechanical backup makes 
possible quiet magnetic gears. 
Notes: 
W 1. This development is in the conceptual stage only, 
and as of date of publication of this Tech Brief nei-
ther a model nor prototype has been constructed. 
2. The concept may be of interest to manufacturers 
and users of magnetic gears and frictionless power 
trains. 
3. No additional documentation is available. Specific 
questions, however, may be directed to: 
Technology Utilization Officer 
Manned Spacecraft Center 
Houston, Texas 77058
Backup Clutch Schematic 
Patent status: 
No patent action is contemplated by NASA. 
Source: Robert A. Shefke of 
The Garrett Corporation 
under contract to 
Manned Spacecraft Center 
(MSC-13408) 
Category 07 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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Magnetic gear backup

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