초록 ▼

An inertial coupling is provided for substantially preventing rotational speed variations of a free power turbine in a multiple shaft gas turbine engine in response to a transient load condition. The inertial coupling comprises a gear assembly having first and second rotatable components driven resp

An inertial coupling is provided for substantially preventing rotational speed variations of a free power turbine in a multiple shaft gas turbine engine in response to a transient load condition. The inertial coupling comprises a gear assembly having first and second rotatable components driven respectively by the free power turbine and by the gas generator section of the gas turbine engine to cooperatively drive a free-wheeling inertial mass. The inertial mass is rotated at a constant speed during steady-state engine operation and provides sufficient rotational inertia during a transient load condition to couple the free power turbine temporarily to the gas generator section to maintain free power turbine speed substantially constant during adjustment of an engine fuel control to accommodate the changed engine load.

대표청구항 ▼

In a gas turbine engine having a gas generator section for producing a flow of high energy gases and a free power turbine section driven by said gases for rotatably driving an engine load, a speed control device, comprising: an epicyclic gear assembly having a first gear, a second gear, an annular a

In a gas turbine engine having a gas generator section for producing a flow of high energy gases and a free power turbine section driven by said gases for rotatably driving an engine load, a speed control device, comprising: an epicyclic gear assembly having a first gear, a second gear, an annular array of differential gears meshed between said first and second gears, and a cage supporting said differential gears for rotation about their individual axes and for orbital motion about the rotational axes of said first and second gears; said first gear being connected to and rotatably driven by the free power turbine section; one of said second gear and cage being connected to and rotatably driven by the gas generator section; said other of said second gear and cage including an inertial mass and being cooperatively driven by said one of said second gear and cage and by said first gear at a substantially constant speed during steady-state engine operation, said inertial mass having a rotational inertia substantially greater than the rotational inertia of the free power turbine section to couple the free power turbine section to the gas generator section to temporarily resist rotational speed change of the free power turbine section during a transient load condition.