NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Evaluation of high-contact-ratio spur gears with profile modificationScoring tests, surface fatigue tests, and single-tooth bending fatigue tests were conducted with four sets of spur gears of standard design and three sets of spur gears of the new tooth form (NTF) design. Scoring tests were conducted in a gear test rig at a speed of 10,000 rpm using a synthetic polyester C5, C6, C7 substituted pentaerythritol oil. Surface fatigue tests were conducted in the same rig at a speed of 10,000 rpm and Hertz stresses of 173 x 10 to the 7th power and 143 x 10 to the 7th power Pa (250,000 and 214,000 psi). Single tooth bending fatigue tests were conducted on both the standard and NTF gears at an initial load that produced a 10.35 x 10 to the eight power Pa (150,000-psi) bending stress. The gears were load cycled to failure or for 3 x 10 to the 6th power cycles, whichever occurred first. The load was increased after test until failure occurred at 3 x 10 to the 6th power cycles or less. Both the standard and NTF gears scored at a gear bulk temperature of approximately 409 K (277 F). At this temperature the load on the NTF gears was 22 percent less than the load on the standard gears. The scoring failure was a function of gear bulk temperature, where for a given lubricant the temperature is a function of gear design, operating load, and speed.
Document ID
19830011879
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Townsend, D. P.
(NASA Lewis Research Center Cleveland, OH, United States)
Baber, B. B.
(Midwest Research Inst.)
Nagy, A.
(Midwest Research Inst.)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Advanced Power Transmission Technol.
Subject Category
Mechanical Engineering
Accession Number
83N20150
Funding Number(s)
CONTRACT_GRANT: NAS3-20026
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available