Accession Number:

AD0650763

Title:

INVESTIGATION OF SOLID LUBRICANTS FOR HELICOPTER TRANSMISSIONS

Descriptive Note:

Final rept. Jul 1965-Nov 1966

Corporate Author:

WESTINGHOUSE RESEARCH LABS PITTSBURGH PA

Personal Author(s):

Report Date:

1967-03-01

Pagination or Media Count:

83.0

Abstract:

The feasibility of using solid lubricants in bearings and gears was demonstrated as a satisfactory method for preventing catastrophic failure and for providing emergency operation of helicopter transmissions in the event of an oil lubrication failure. Modified size-206 Conrad-type ball bearings with retainers of a glass reinforced polyimide, WRP-140, operated initially under a base line condition of oil lubrication for 40 hr. This was followed immediately by 0.5 hr of residual oil lubrication and 1.5 hr with no external lubrication at 14,000 rpm for various thrust loads of up to 800 lb without failure. Bearings with a silver alloy - Teflon composite, RB-HP-15 operated under similar oil and residual lubrication for 0.5 hr at loads of up to 450 lb before failure. A conventional 12 diametral pitch DP AISI 9310 gear set, using a 6-in. gear and a 2-in. pinion with a 2.5-in. idler of WRP-140, operated under base line conditions of oil lubrication for 40 hr at approximately 14,000 rpm and at a tooth load of 160 lb 640 lbin. tooth width ppi. Similar gears with the same idler operated 0.5 hr with no external lubrication at a load of 1220 ppi 305 lb tooth load. With an RB-HP-15 idler, other gears were operated without lubrication for 0.5 hr at a load of 1220 ppi. Author

Subject Categories:

  • Helicopters
  • Lubricants and Hydraulic Fluids

Distribution Statement:

APPROVED FOR PUBLIC RELEASE