GAS-TURBINE ENGINE BEARING SUPPORT Russian patent published in 2003 - IPC

FIELD: mechanical engineering. SUBSTANCE: invention relates to gas-turbine engines of aircraft and ground applications. According to invention, intermediate air-oil space is made in bearing support of gas-turbine engine with oil space and labyrinth air seal between oil space and labyrinth air seal in stator flange. Intermediate air-oil space is separated from oil space by cutoff lip with side surface inclined to oil space and with radial clearance δ relative to outer cylindrical surface of labyrinth bushing. Axial ring projection is made on end face surface of bushing pointed to oil space, and two grooves with rectangular-section ring lip are made between cylindrical surface of labyrinth bushing and its labyrinth. Intermediate air-oil space and oil space communicate in lower part of stator flange through inclined channels at L/δ = 20...50, and (D-d)/2=2-20 where L axial length of intermediate air-oil space; δ - is radial clearance between cylindrical surface of bushing and cutoff lip of stator flange; D is diameter of cylindrical surface of bushing; d is outer diameter of bearing inner race. EFFECT: improved reliability of bearing owing to non-contact sealing of oil spaces of bearing support and prevention of oil getting into air spaces of engine. 2 dwg