Small gas turbine engine with unmixed exhaust

Details Small gas turbine engine with unmixed exhaust Small gas turbine engine with unmixed exhaust

2008-08-01

2010-06-22

Look, Edward (Department: 3745)

Rotary kinetic fluid motors or pumps

With lubricating, sealing, packing or bearing means having...

For shaft sealing, packing, lubricating or bearing means

C415S115000, C415S229000

Reexamination Certificate

active

07740441

ABSTRACT:
A small twin spool gas turbine engine with a bearing support arrangement in which the bearings are dampened by O-rings secured between the bearing races and the support structure, the bearings are arranged in series so that a cooling air can be passed through the bearings to prevent overheating, and the bearings are dry lubricated. The aft end of the engine includes high speed and low speed ball bearings supported with preload springs to add additional damping capability. The end bearing support assemblies form a cooling air path for the cooling fluid to flow through a passage within one of the guide vanes, through the bearings and a hole in the low pressure turbine rotor disk and out the exhaust of the engine. A snorkel tube extends into the bypass air channel drawing air for the bearings, and has a slanted opening preventing dirt particulates from entering the bearing cooling passage.

REFERENCES:
patent: 6260352 (2001-07-01), Negulescu et al.
patent: 2007/0240424 (2007-10-01), Matheny et al.

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