Abstract: A lubrication system for a turbine engine having a main shaft rotatably mounted by a bearing assembly in a support housing is provided in which the turbine fuel is used as the lubricant. The main turbine shaft rotatably drives a fuel pump having its inlet coupled to the fuel source for the turbine engine and having its outlet coupled to outlet passage means formed in the support housing. The passage means, in turn, is fluidly connected to a fuel jet orifice positioned in the support housing to project a high velocity and low flow fuel stream onto the bearing assembly and thereby lubricates and cools the same. After passing through the bearing assembly, the fuel lubricant exhausts through exhaust passage means formed between the turbine and the support housing and is exhausted into the exhaust duct of the turbine engine.

Abstract: A bearing lubrication system for a turbine engine is provided which utilizes a fuel-air mist to both lubricate and cool the bearing assembly. An annular fuel-air distributor is positioned adjacent the bearing assembly and includes an inlet and several outlet ports directed towards the bearing assembly. A fuel port and a source of pressurized air are coupled to the inlet of the fuel-air distributor so that the pressurized air mixes the fuel into the air and projects a fuel-air mist through the distributor and onto the bearing assembly. A fuel metering device maintains the fuel-air ratio outside of its flammability range to prevent fires within the bearing cavity. Exhaust passageways from the bearing cavity are disposed adjacent the bearing outer race to provide additional cooling of the bearing assembly during the exhaustion of the fuel-air mist from the bearing cavity.