A generator assembly for a gas turbine engine. The assembly includes an electrical generator connected via a first sprag clutch to an accessory gearbox driven by the engine. The generator is also connected by a second sprag clutch to an air turbine connected to engine bleed valves which are selectiv
A generator assembly for a gas turbine engine. The assembly includes an electrical generator connected via a first sprag clutch to an accessory gearbox driven by the engine. The generator is also connected by a second sprag clutch to an air turbine connected to engine bleed valves which are selectively open when the engine speed falls below a predetermined level. The clutches are arranged such that the generator is driven at any time by the fastest rotating of the gearbox and turbine.
대표청구항▼
We claim: 1. A generator assembly for a gas turbine engine, the assembly including an electrical generator, wherein the assembly also includes a first clutch arrangement which selectively connects the electrical generator to an accessory gearbox driven by the engine, an air turbine, a second clutch
We claim: 1. A generator assembly for a gas turbine engine, the assembly including an electrical generator, wherein the assembly also includes a first clutch arrangement which selectively connects the electrical generator to an accessory gearbox driven by the engine, an air turbine, a second clutch arrangement which selectively connects the electrical generator and the air turbine, the air turbine being connected to one or more engine bleed valves so as to be driven by air directed from the valve or valves, the first and second clutch arrangements being configured such that in use the electrical generator is connected to whichever of the accessory gearbox or air turbine is rotated fastest, and the electrical generator is disconnected from the other of the accessory gearbox and air turbine, wherein the one or more engine bleed valve is constructed and arranged to only be open when the engine speed is below a predetermined level. 2. A gas turbine engine assembly, the assembly including an electrical generator, an accessory gearbox, and one or more engine bleed valves, wherein the engine also includes a first clutch arrangement which selectively connects the electrical generator to the accessory gearbox, an air turbine connected to the engine bleed valve or valves so as to be driven by air directed from the valve or valves, a second clutch arrangement which selectively connects the electrical generator and the air turbine, the first and second clutch arrangements being configured such that in use the electrical generator is connected to whichever of the accessory gearbox or air turbine is rotated fastest, and the electrical generator is disconnected from the other of the accessory gearbox and air turbine, wherein the one or more engine bleed valves is constructed and arranged to only be open when the engine speed is below a predetermined level. 3. An assembly according to claim 1, wherein a manifold is provided which connects a plurality of engine bleed valves, to collect air from the valves for delivery to the air turbine. 4. An assembly according to claim 1, wherein the first and/or second clutch arrangements are in the form of a sprag clutch. 5. An assembly according to claim 1, wherein the first and or second clutch arrangements comprise any of dry or wet friction plates, hydraulic torque converters, ratchet and pawl arrangements. 6. An assembly according to claim 1 wherein an inlet connection is provided to permit connection of the assembly to an external source of air to drive the air turbine. 7. An assembly according to claim 6, wherein a non return valve is provided in the inlet connection to prevent air passing out thereof. 8. An assembly according to claim 6 wherein a non return valve is provided between the inlet connection and the engine bleed valve or valves to prevent air passing from the connection to the valve or valves. 9. An assembly according to claim 6 further comprising an aircraft engine electronic controller for actively controlling the first clutch arrangement to enable the generator to drive the gear box. 10. An aircraft, wherein the aircraft includes a plurality of gas turbine engines according to claim 2. 11. An aircraft according to claim 10, wherein the aircraft also includes one or more electrically powered compressors for providing cabin pressurisation, the or each electrically powered compressor being electrically connected to one or more of the electrical generators of the engines. 12. An assembly according to claim 2, wherein a manifold is provided which connects a plurality of engine bleed valves, to collect air from the valves for delivery to the air turbine. 13. An assembly according to claim 2, wherein an inlet connection is provided to permit connection of the assembly to an external source of air to drive the air turbine. 14. An assembly according to claim 13, wherein a non return valve is provided in the inlet connection to prevent air passing out thereof. 15. An assembly according to claim 13, wherein a non return valve is provided between the inlet connection and the engine bleed valve or valves to prevent air passing from the connection to the valve or valves. 16. An assembly according to claim 13, further comprising an aircraft engine electronic controller for actively controlling the first clutch arrangement to enable the generator to drive the gear box. 17. An aircraft, wherein the aircraft includes a plurality of gas turbine engines according to claim 1. 18. An aircraft according to claim 17, wherein the aircraft also includes one or more electrically powered compressors for providing cabin pressurisation, the or each electrically powered compressor being electrically connected to one or more of the electrical generators of the engines.
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이 특허에 인용된 특허 (6)
Benson Paul A. (Palos Verdes Estates CA), Aircraft engine bleed air flow balancing technique.
Lampe Steven W. (4860 Lorraine Dr. San Diego CA 92115) McArthur Malcolm J. (13821 Davenport Ave. San Diego CA 92129), Power unit fuel pressurization system.
Teicholz, Matthew D.; Sutliff, Jeffrey W.; Greene, Jr., William H.; White, Kenneth J.; Feulner, Matthew R.; Virtue, Jr., John P.; Glahn, Jorn A.; Hoover, Philip D.; Pinedo, Victor M.; Solomonides, Jason B., Modified start sequence of a gas turbine engine.
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