Bowed rotor prevention system
First Claim
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1. A bowed rotor prevention system for a gas turbine engine, the bowed rotor prevention system comprising:
- a bowed rotor prevention motor operable to drive rotation of the gas turbine engine through an engine accessory gearbox;
an air turbine starter, wherein the bowed rotor prevention motor drives a motor shaft that is mechanically linked to an air turbine starter drive shaft of the air turbine starter;
an air turbine of the air turbine starter operable to rotate an output shaft of the air turbine starter, wherein an output bevel gear of the output shaft interfaces with a motor bevel gear of the motor shaft, and an input bevel gear of the air turbine starter drive shaft interfaces with the motor bevel gear at a gear interface of the bowed rotor prevention system; and
a controller operable to engage the bowed rotor prevention motor and drive rotation of the gas turbine engine below an engine starting speed until a bowed rotor prevention threshold condition is met.
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Abstract
A bowed rotor prevention system for a gas turbine engine includes a bowed rotor prevention motor operable to drive rotation of the gas turbine engine through an engine accessory gearbox. The bowed rotor prevention system also includes a controller operable to engage the bowed rotor prevention motor and drive rotation of the gas turbine engine below an engine starting speed until a bowed rotor prevention threshold condition is met.
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Citations
20 Claims
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1. A bowed rotor prevention system for a gas turbine engine, the bowed rotor prevention system comprising:
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a bowed rotor prevention motor operable to drive rotation of the gas turbine engine through an engine accessory gearbox; an air turbine starter, wherein the bowed rotor prevention motor drives a motor shaft that is mechanically linked to an air turbine starter drive shaft of the air turbine starter; an air turbine of the air turbine starter operable to rotate an output shaft of the air turbine starter, wherein an output bevel gear of the output shaft interfaces with a motor bevel gear of the motor shaft, and an input bevel gear of the air turbine starter drive shaft interfaces with the motor bevel gear at a gear interface of the bowed rotor prevention system; and a controller operable to engage the bowed rotor prevention motor and drive rotation of the gas turbine engine below an engine starting speed until a bowed rotor prevention threshold condition is met. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A gas turbine engine comprising:
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an engine accessory gearbox configured to be coupled to a high pressure spool; and a bowed rotor prevention system comprising; a bowed rotor prevention motor operable to drive rotation of the gas turbine engine through the engine accessory gearbox; an air turbine starter, wherein the bowed rotor prevention motor drives a motor shaft that is mechanically linked to an air turbine starter drive shaft of the air turbine starter; an air turbine of the air turbine starter operable to rotate an output shaft of the air turbine starter, wherein an output bevel gear of the output shaft interfaces with a motor bevel gear of the motor shaft, and an input bevel gear of the air turbine starter drive shaft interfaces with the motor bevel gear at a gear interface of the bowed rotor prevention system; and a controller operable to engage the bowed rotor prevention motor and drive rotation of the gas turbine engine below an engine starting speed until a bowed rotor prevention threshold condition is met. - View Dependent Claims (11, 12, 13, 14)
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15. A method of bowed rotor prevention for a gas turbine engine, the method comprising:
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interfacing an output bevel gear of an output shaft of an air turbine starter with a motor bevel gear of a motor shaft of a bowed rotor prevention motor; interfacing an input bevel gear of an air turbine starter drive shaft with the motor bevel gear; engaging the bowed rotor prevention motor with turbomachinery of the gas turbine engine through an engine accessory gearbox of the gas turbine engine; and driving rotation of the turbomachinery of the gas turbine engine by the bowed rotor prevention motor below an engine starting speed until a bowed rotor prevention threshold condition is met. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification