APPLICATION OF A POWDER LUBRICATION SYSTEM TO A GAS TURBINE ENGINE, PART 3
Abstract
The feasibility of adapting a powder lubrication system for the lubrication of the main shaft bearings of an unfired J-69 gas turbine engine was established, in lieu of the oil lubrication system used in the standard engine. Ball and roller bearings have been successfully lubricated with powder- lubrication in a J-69 unfired gas turbine engine. Ball bearings have been successfully operated for periods of 35 hours with powder lubricants. Thrust load tests to 500 pounds at 8000 rpm were conducted. Testing with a 100 pound thrust load to 20,000 rpm with heated (bleed air temperature) carrier air was successfully performed on two different bearing designs. Both bearings were deep groove, split inner design with a one piece outer ring guided retainer made of silverplated AMS6415 steel; one bearing had inner and outer races and balls of M-50 vacuum melt tool steel; the other the inner and outer races and balls of 440CM modified corrosion resistant steel. Roller bearings have performed successfully through a speed range of 8,000 to 20,000 rpm at stabilized operating temperatures of 515F, simulating estimated operating conditions. The bearing had inner ring guided rollers and an outer ring guided retainer. Rings and rollers were of M-50 vacuum melt tool steel and the retainer was Monel S. The lubricant used for all the evaluations was a powder mixture consisting of five parts of micronized Acheson No. 38 graphite plus one part of laboratory-grade cadmium oxide entrained in an air carrier. The optimum lubricant powder flow for ball bearing operation under thrust loaded conditions is about 0.015 grams per minute.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1967
- Accession Number
- AD0832204
Entities
People
- Stanley Wallerstein