A low friction, two-component bearing comprised of a pair of ball-bearing races for transmitting rotary motion and an inner series of ball bearing assemblies for transmitting axial motion is described and should be useful in mechanisms such as stress-strain testing machines

Dow, N. F.

Peters, R. W.

English

NASA Technical Reports Server

i 
SECTION A-A 
d Shaft 
er Race
 nner Race 
nsverse 
Il-Bearing 
sembly 
L 
September 1964	 Brief 64-10130 
NASA TECH BRIEF	
-I& 
This NASA Tech Brief is issued by the Technology Utilization Division to acquaint 
industry with the technical content of an innovation derived from the space program. 
Bearing Transmits Rotary and Axial Motion
The problem: Providing a low-friction bearing that 
transmits rotary and axial motion. 
The solution: A two-component bearing compris-
ing a pair of ball-bearing races for transmitting rotary 
motion and an inner series of ball-bearing assemblies 
for transmitting axial motion. 
How it's done: A series of transverse ball-bearing 
assemblies extends inwardly from the inner race. The 
larger race in each of these assemblies is free to rotate 
about a small fixed shaft when an axial thrust or pull 
is applied to the drive shaft. The drive shaft is thus 
permitted to move axially with a minimum of friction. 
When torque is applied to the drive shaft, tangential 
forces are transmitted through the transverse bearing 
assemblies to the inner ball-bearing race, which per-
mits essentially friction-free rotation of the shaft. 
Notes: 
1. This bearing should be especially useful in mech-
anisms that permit only extremely close tolerances, 
such as in stress-strain testing machines.
2. Inquiries concerning this invention may be directed 
to:
Technology Utilization Officer 
Langley Research Center 
Langley Station 
Hampton, Virginia, 23365 
Reference: B64-10130 
Patent status: NASA encourages the commercial 
use of this invention. It has been patented by NASA 
(U.S. Patent No. 2,903,307), and royalty-free license 
rights will be granted for its commercial development. 
Inquiries about obtaining a license should be ad-
dressed to NASA Headquarters, Washington, D.C., 
20546.
Source: Roger W. Peters and 
Norris F. Dow
(Langley-27) 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States Govern-
ment, nor NASA, nor any person acting on behalf of NASA: A. Makes 
any warranty or representation, express or implied, with respect to the 
accuracy, completeness, or usefulness of the information contained in
this document, or that the use of any information, apparatus, method, 
or process disclosed in this document may not infringe privately-owned 
rights; or B. Assumes any liabilities with respect to the use of, or for 
damages resulting from the use of, any information, apparatus, method, 
or process disclosed in this document.
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Bearing transmits rotary and axial motion

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