Propulsion engine
AssigneeROLLS-ROYCE plc
InventorDavid P. Scothern
Life of this patent
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Abstract
A propulsion engine (100) for an aircraft, the propulsion engine comprising: one or more fans (110, 120); driving means (132) arranged to drive the one or more fans; and power transfer means (134) connected to the one or more fans and arranged to selectively transfer a variable amount of power to or from the one or more fans so as to control the rotational speed of the one or more fans.
Claims15
A propulsion engine for an aircraft, the propulsion engine comprising:
- first and second fans;
- a power turbine that drives the first and second fans;
- and
- power transfer means mechanically connected to a core of the propulsion engine and mechanically connected to the first fan by a shaft assembly and arranged to selectively transfer a variable amount of power to or from the first fan so as to maintain an optimum speed ratio between the first and second fans.
A method of controlling a propulsion engine for an aircraft, the propulsion engine comprising first and second fans, wherein the method comprises:
- driving the first and second fans by virtue of a power turbine;
- and
- selectively transferring a variable amount of power to or from the first fan by virtue of a power transfer means connected to a core of the propulsion engine and mechanically connected to the first fan by a shaft assembly so as to maintain an optimum speed ratio between the first and second fans.
A speed controlling assembly for a propulsion engine, the propulsion engine comprising first and second fans driven by a power turbine,
- wherein the speed controlling assembly comprises power transfer means connected to a core of a propulsion engine and mechanically connected to the first fan by a shaft assembly and arrangeable to selectively transfer a variable amount of power to or from the first fan so as to maintain an optimum speed ratio between the first and second fans.
Dependencies are inferred from the claim text.