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A coupling arrangement for supporting a power turbine in a gas turbine engine. The power turbine section comprises a stator structure, first and second rotors, and first and second bearings. The first and second rotors are coaxially disposed about a longitudinal axis of the stator. An annular gas fl

A coupling arrangement for supporting a power turbine in a gas turbine engine. The power turbine section comprises a stator structure, first and second rotors, and first and second bearings. The first and second rotors are coaxially disposed about a longitudinal axis of the stator. An annular gas flowpath is coaxially positioned between the first and second rotors. Annular arrays of turbine blades are coupled to the first and second rotors and extend into the flowpath so that a gas stream flowing through the flowpath reacts with the turbine blades causing the rotors to counterrotate. The first bearings are interposed between the first rotor and the stator structure to rotatably secure the first rotor to the stator structure. The second bearings are interposed between the second rotor and the first rotor to rotatably secure the second rotor to the first rotor. By securing the second rotor to the first rotor both rotors maintain a common axis of rotation when the stator structure undergoes deflection along its longitudinal axis.

대표청구항 ▼

A power turbine section in a gas turbine engine comprising: a stationary static structure centered about a longitudinal axis; an outer rotor and an inner rotor concentrically positioned about one another along the longitudinal axis and defining an annular flowpath between said outer and inner rotors

A power turbine section in a gas turbine engine comprising: a stationary static structure centered about a longitudinal axis; an outer rotor and an inner rotor concentrically positioned about one another along the longitudinal axis and defining an annular flowpath between said outer and inner rotors for passing a high energy gas stream through the engine; a first annular array of turbine blades coupled to said inner rotor and extending into said flowpath for transforming energy of the gas stream into movement of said inner rotor; a second annular array of turbine blades coupled to said outer rotor and extending into said flowpath for transforming energy of the gas stream into movement of said outer rotor, said second annular array of turbine blades being aligned coaxially with and adjacent to said first annular array of turbine blades; first bearing means disposed at one axial end of said inner rotor for rotatably securing said inner rotor to said static structure; and second bearing means disposed between said inner rotor and said outer rotor for rotatably securing said outer rotor concentrically about said inner rotor with a common axis of rotation decoupled from said static structure.