Accessory gearboxes

Patent metadata

Field	Value
Publication number	US-2018283281-A1
Application number	US-201715476319-A
Country	US
Kind code	A1
Filing date	Mar 31, 2017
Priority date	Mar 31, 2017
Publication date	Oct 4, 2018
Grant date	—

Abstract

An accessory gearbox for a gas turbine engine has an accessory gear train, a first input and a second input. The first input and the second input are coupled to the accessory gear train. The accessory gear train operably couples the first input and the second input for communicating rotational energy between one or more accessories mounted to the accessory gearbox and the first and second inputs.

First claim

What is claimed is:

1 . An accessory gearbox for a gas turbine engine, comprising:
an accessory gear train; a first input coupled to the accessory gear train; and a second input coupled to the accessory gear train, wherein accessory gear train operably couples the first input and the second input for communicating rotational energy between an accessory mounted to the accessory gearbox and the first and second inputs.

2 . The accessory gearbox as recited in claim 1 , further comprising a first differential connected to the first input and coupling the first input to the accessory gear train.

3 . The accessory gearbox as recited in claim 2 , further comprising a pump motor and a fuel pump connected to the first differential, wherein the pump motor is operatively coupled to the fuel pump through the first differential.

4 . The accessory gearbox as recited in claim 2 , further comprising an oil pump connected to the first differential and coupled therethrough to the first input and the second input.

5 . The accessory gearbox as recited in claim 2 , further comprising a pump differential coupled to the pump motor by the first differential.

6 . The accessory gearbox as recited in claim 5 , further comprising an oil pump tune motor connected to the pump differential and operatively coupled therethrough to an oil pump.

7 . The accessory gearbox as recited in claim 5 , wherein the pump differential includes first and second spider gears arranged along an oil pump shaft, the oil pump shaft being supported for rotation along an axis orthogonal to the first input and parallel to the second input.

8 . The accessory gearbox as recited in claim 1 , wherein the first differential includes first and second spider gears coaxial with a pump motor shaft, the pump motor shaft being coaxial with the first input and orthogonal to the second input.

9 . The accessory gearbox as recited in claim 1 , further comprising a second differential connected to second input and coupled therethrough the accessory gear train.

10 . The accessory gearbox as recited in claim 9 , further comprising a generator connected to the second differential, the first input and the second input being operably coupled through the second differential to the generator.

11 . The accessory gearbox as recited in claim 9 , wherein the second differential includes first and second spider gears coaxial with the second input and orthogonal relative to the first input.

12 . The accessory gearbox as recited in claim 1 , further comprising an auxiliary oil pump and a hydraulic pump connected to the accessory gear train, the first input and the second input being operably coupled to the auxiliary oil pump and the hydraulic pump through the accessory gear train.

13 . The accessory gearbox as recited in claim 12 , further comprising a first differential connecting the first input and the accessory gear train to communicate rotational energy to the hydraulic pump and the auxiliary oil pump from a gas turbine engine low speed spool.

14 . The accessory gearbox as recited in claim 12 , further comprising a second differential connecting the second input and the accessory gear train to communicate rotational energy to the hydraulic pump and the auxiliary oil pump from a gas turbine engine high speed spool.

15 . The accessory gearbox as recited in claim 1 , wherein the second input includes a coupling connecting the accessory gear train to a gas turbine engine high speed spool, wherein the coupling includes a brake.

16 . A gas turbine engine, comprising:
an accessory gearbox as recited in claim 1 , the accessory gearbox further comprising a first differential connected to the first input and coupling therethrough the first input to the accessory gear train, and a second differential connected to second input and coupling therethrough the second input to the accessory gear train; a low speed spool coupled to the first differential by the first input; and a high speed spool coupled to the second differential by the second input, the first and second differential configured to combine rotational energy received therethrough for powering one or more accessories mounted to the accessory gearbox.

17 . A method of communicating rotational energy between a gas turbine engine and one or more gas turbine engine accessories, comprising:
receiving rotational energy at an accessory gearbox from one or more of a first input, a second input, and an engine accessory; and communicating the rotational energy through an accessory gear train to one or more of the first input, the second input and the engine accessory.

18 . The method as recited in claim 17 , wherein receiving rotational energy comprises receiving rotational energy from a first input and a second input, wherein communicating the rotational energy comprises communicating the rotational energy to the engine accessory.

19 . The method as recited in claim 17 , wherein receiving rotational energy comprises receiving rotational energy from the engine accessory, wherein communicating the rotational energy comprises communicating the rotational energy to the second input.

20 . The method as recited in claim 17 , wherein receiving rotational energy comprises receiving rotational energy from the first input only, wherein communicating the rotational energy comprises communicating the rotational energy to engine accessory.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Veilleux Jr Leo J
• Ribarov Lubomir A

Classifications

• F05D2220/32

  in gas turbines · CPC title

• F05D2260/40311

  of the epicyclical, planetary or differential type · CPC title

• F16H48/08

  comprising bevel gears · CPC title

• F01D15/08

  Adaptations for driving, or combinations with, pumps · CPC title

• F01D5/02

  Blade-carrying members, e.g. rotors (rotors of non-bladed type F01D1/34; stators F01D9/00 {; selecting particular materials F01D5/28}) · CPC title