초록 ▼

In a gas turbine engine with a bypass duct, a rotating stage of airfoils in the bypass duct is supported through and driven by torque transmitting members extending across the core stream flow path, but which are sufficiently flexible in the radial direction to avoid passing centrifugal loads from t

In a gas turbine engine with a bypass duct, a rotating stage of airfoils in the bypass duct is supported through and driven by torque transmitting members extending across the core stream flow path, but which are sufficiently flexible in the radial direction to avoid passing centrifugal loads from the rotating stage across the core stream flow path. The rotating bypass stream stage is also supported through a bearing secured directly to the engine main support structure radially outwardly of the core stream flow path. The majority of aircraft maneuver loads are reacted at this bearing, and a minor portion of the maneuver loads pass across the core stream to a bearing located radially inwardly thereof. The airfoils may be either variable pitch airfols or fixed airfoils. If variable pitch, they may be used to reverse the flow in the bypass duct for thrust reversing.

대표청구항 ▼

A gas turbine engine for an aircraft, said engine having an axis, a front end, and a rear end, said engine comprising, in series flow relationship, axial flow compressor means, combustor means, and turbine means, including inner and outer concentric core stream wall means spaced apart defining a cor

A gas turbine engine for an aircraft, said engine having an axis, a front end, and a rear end, said engine comprising, in series flow relationship, axial flow compressor means, combustor means, and turbine means, including inner and outer concentric core stream wall means spaced apart defining a core stream annular gas flow path therebetween having an inlet and including the flow path of said axial flow compressor means; bypass duct means surrounding said compressor means, including inner and outer concentric bypass duct wall means defining an annular bypass stream flow path therebetween surrounding said core stream flow path; a disk disposed entirely between said core stream gas flow path and said bypass stream flow path downstream of said core stream flow path inlet and rotatable about said engine axis; a plurality of circumferentially disposed airfoils secured to said disk and extending across said bypass stream flow path; stationary engine support structure disposed radially outwardly of said core stream gas flow path and extending from said outer core stream wall means to said outer bypass duct wall means; first bearing support means disposed radially inwardly of said core stream gas flow path; first bearing means disposed radially inwardly of said core stream gas flow path and mounted on said first bearing support means, said first bearing means including a first rotatable race; second bearing means axially spaced from said irst bearing means and mounted on said engine support tructure radially outwardly of the core stream flow ath and including a second rotatable race; disk support means extending etween and attached to said disk and second rotatable ace and being reIatively stiff in the radial irection for transmitting aircraft maneuver loads and entrifugal loads from said disk into said engine upport structure; and drive means connecting said turbine means to said disk for rotating said disk including torque transmitting means secured to said first rotatable race, said torque transmitting means including airfoil shaped strut means rotatable about the engine axis and extending across the flow path of said axial flow compressor means and connected to said disk for rotating said disk and airfoils about the engine axis and for transmitting maneuver loads from said disk into said first bearing support means, wherein the axial location of said disk is such that a major portion of the maneuver loads therefrom are transmitted into said engine support structure, and a minor portion of the maneuver loads therefrom are transmitted into said first bearing support means.