Constant speed transmission for gas turbine engine

• US 8,966,875 B2
• Filed: 10/21/2011
• Issued: 03/03/2015
• Est. Priority Date: 10/21/2011
• Status: Active Grant

• Current Assignee: Rtx Corporation
• Original Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Suciu, Gabriel L., Merry, Brian D., Penda, Allan R., Dye, Christopher M.
• Primary Examiner(s): Rodriguez, William H
• Application Number:
  US13/278,243
• Publication Number:
  US 20130098067A1
• Time in Patent Office: 1,229 Days
• Field of Search: 608/02, 60/390.8, 602/261, 602/62, 607/92, 60/391.62, 60/391.63, 607/83, 602/68, 607/79, 607/73, 184/4, 184/6.11, 184/6.12, 184/27.2, 244/58, 477/30, 477/31
• US Class Current: 60/39.08
• CPC Class Codes: F02C 3/107 with two or more rotors connected by power transmission
• CPC Class Codes: F02C 6/08 the gas being bled from the gas-turbine compressor
• CPC Class Codes: F02C 7/14 of fluids in the plant , e.g. lubricant or fuel F02C7/185 takes precedence
• CPC Class Codes: F02C 7/32 Arrangement, mounting, or driving, of auxiliaries
• CPC Class Codes: F02K 3/06 with front fan
• CPC Class Codes: F05D 2260/213 by the provision of a heat exchanger within the cooling circuit
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A gas turbine engine includes a constant speed transmission driven by a spool. The constant speed transmission drives a first pump and a second pump. In a further non-limiting example, the first pump is driven by a first drive shaft which is driven by the constant speed transmission and the second pump is driven by a second drive shaft which is driven by the first shaft through a gearbox to provide a constant speed ratio between the first shaft and the second shaft.

Claims

1. A gas turbine engine comprising:

a spool;

a constant speed transmission driven by said spool;

a first pump driven by said constant speed transmission; and

a second pump driven by said constant speed transmission.

2. The gas turbine engine as recited in claim 1, wherein said first pump and said second pump are driven by a single axial drive shaft driven by said constant speed transmission.

3. The gas turbine engine as recited in claim 1, wherein said first pump and said second pump are arranged along a common axis.

4. The gas turbine engine as recited in claim 1, wherein said first pump is driven by a first drive shaft driven by said constant speed transmission and said second pump is driven by a second drive shaft driven by said constant speed transmission.

5. The gas turbine engine as recited in claim 4, wherein said first drive shaft is parallel to said second drive shaft.

6. The gas turbine engine as recited in claim 1, further comprising an Air-Oil Cooler downstream of said first pump.

7. The gas turbine engine as recited in claim 6, further comprising an Air-Air PreCooler downstream of said second pump, said Air-Air PreCooler downstream of said Air-Oil Cooler.

9. The gas turbine engine as recited in claim 1, wherein said constant speed transmission provides a 5:

1 continuously variable gear ratio capability.

10. The gas turbine engine as recited in claim 9, wherein said spool is a low spool that operates at speed excursions of up to 80% between a first condition and a second condition.

8. A gas turbine engine comprising:

a spool;

a constant speed transmission driven by said spool;

a first pump driven by said constant speed transmission; and

a second pump driven by said constant speed transmission, wherein said first pump is driven by a first drive shaft driven by said constant speed transmission and said second pump is driven by a second drive shaft driven by said first shaft through a gearbox to provide a constant speed ratio between said first shaft and said second shaft.

11. A gas turbine engine comprising:

a spool;

a constant speed transmission driven by said spool;

a first pump driven by said constant speed transmission;

a second pump driven by said constant speed transmission;

an Air-Oil Cooler downstream of said first pump; and

an Air-Air PreCooler downstream of said second pump, said Air-Air PreCooler downstream of said Air-Oil Cooler.

12. The gas turbine engine as recited in claim 11, wherein said spool drives a fan through a geared architecture.

13. The gas turbine engine as recited in claim 12, wherein said spool operates at speed excursions of up to 80% between a first condition and a second condition.

14. The gas turbine engine as recited in claim 11, wherein said constant speed transmission provides a 5:

1 continuously variable gear ratio capability.

15. The gas turbine engine as recited in claim 11, wherein said first pump and said second pump are driven by a single axial drive shaft driven by said constant speed transmission.

16. The gas turbine engine as recited in claim 11, wherein said first pump and said second pump are arranged along a common axis.

17. The gas turbine engine as recited in claim 11, wherein said first pump is driven by a first drive shaft driven by said constant speed transmission and said second pump is driven by a second drive shaft driven by said constant speed transmission.