Patent ID: 7748209

Claim:
A small single use twin spool gas turbine engine comprising: an outer rotor shaft with a compressor on the front end and a first turbine blade on the rear end; an inner rotor shaft rotatable within the outer rotor shaft and including a fan on the front end and a second turbine blade on the rear end; an inlet guide vane positioned between the fan and the compressor; an outlet guide vane positioned between the first turbine blade and the second turbine blade; a first bearing supported between the inlet guide vane and the inner rotor shaft; a second bearing supported between the inlet guide vane and the outer rotor shaft; a third bearing supported between the outlet guide vane and the outer rotor shaft; a fourth bearing supported between the outlet guide vane and the inner rotor shaft; and, means to divert a portion of the bypass fan air through the third and fourth bearings to provide cooling for the bearings.