GENERAL PURPOSE LUBRICATING COMPOSITION FOR TRANSMISSIONS AND HELICOPTER PROPELLERS Russian patent published in 1998 - IPC

FIELD: lubrication of helicopter transmissions and horizontal and vertical hinges of helicopter propellers. SUBSTANCE: claimed composition comprises (wt %); 0.01-0.5 phenyl alpha- naphthyl amine; 0.001-1.0 4-methyl-2,6-di-tert- butylphenol; 5.0-40.0 diisoctyl sebacinate; 0.001-0.01 mixture of mono- and dialkyl derivatives of diphenylamine; 2.0-10.0 sulfur-phosphorus-nitrogen containing additive or mixture of additives containing sulfur and phosphorus; 0.8-3.0 succinimide ash-free dispersing addition agent; and the polyalpha-olefinic oil balance. The claimed composition preferably comprises not more than 15% polyisobutylene with molecular weight of 600-13,000 or styrene-diene thickener. Said composition allows for serviceability of helicopter transmissions within current service life due to higher lubricating properties and viscosity and temperature characteristics. EFFECT: improved properties of the general purpose lubricating compositions. 2 cl, 3 tbl