NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Friction losses in a lubricated thrust-loaded cageless angular-contract bearingThe NASA spinning torque apparatus was modified to measure the spinning torque on a cageless ball thrust bearing. Friction torque was measured for thrust loads varying from 44.5 to 403 newtons (10 to 90 lb) at speeds of 1000, 2000, and 3000 rpm. Tests were conducted with di-2-ethylhexyl sebacate and a synthetic paraffinic oil. These tests were run with either oil jet lubrication or with a thin surface film of lubricant only. An analytical model which included rolling resistance was developed and extended from previous models for spinning torque and lubricant rheology. The model was extended by the inclusion of rolling resistance. The computed values were in fair agreement with the experimental results and confirmed previous hypotheses that a thin lubricant film gives minimum bearing torque and an oil jet flow of a viscous lubricant will result in considerable rolling torque in addition to the torque due to ball spin.
Document ID
19730017757
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Townsend, D. P. (NASA Lewis Research Center Cleveland, OH, United States)
Allen, C. W. (NASA Lewis Research Center Cleveland, OH, United States)
Zaretsky, E. V. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 2, 2013
Publication Date
July 1, 1973
Subject Category
Machine Elements And Processes
Report/Patent Number
E-7284
NASA-TN-D-7356
Accession Number
73N26484
Funding Number(s)
PROJECT: RTOP 501-24
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available