GAS TURBINE ACCESSORY GEARBOX INCORPORATING DECOUPLING MEANS

• US 20140127000A1
• Filed: 07/02/2012
• Published: 05/08/2014
• Est. Priority Date: 07/04/2011
• Status: Active Grant

• Current Assignee: Safran Transmission Systems
• Original Assignee: Hispano-Suiza (Safran SA)
• Inventors: Fritz, Romaric, Abousleiman, Vincent
• Granted Patent: US 9,638,107 B2
• Time in Patent Office: Days
• US Class Current: 415/124.1
• CPC Class Codes: F02C 7/32 Arrangement, mounting, or driving, of auxiliaries
• CPC Class Codes: F02C 7/36 Power transmission arrangements between the different shafts of the gas turbine plant, or between the gas-turbine plant and the power user F02C3/107 - F02C3/13 and F02C7/32 take precedence; couplings for transmitting rotation F16D; gearing in general F16H
• CPC Class Codes: F05D 2260/33 with a bayonet coupling
• CPC Class Codes: F05D 2260/4023 through a friction clutch
• CPC Class Codes: F05D 2260/4031 as in toothed gearing
• CPC Class Codes: F16D 11/04 with clutching members movable only axially
• CPC Class Codes: F16D 2001/103 the torque is transmitted via splined connections
• CPC Class Codes: F16D 2023/126 Actuation by rocker lever; Rocker levers therefor
• CPC Class Codes: F16D 28/00 Electrically-actuated clutches arrangements for synchronisation F16D23/02; clutches actuated directly by means of an electromagnet F16D27/00; automatic clutches F16D43/00 - F16D45/00; external control F16D48/00
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A gas turbine AGB has a front lateral face, a rear lateral face opposite from the front lateral face, and a peripheral rim closing the box. At least one gear train is mounted in the AGB and is made up of a plurality of gearwheels meshing together, and designed to be coupled to a drive shaft for driving an accessory. The AGB further comprises, mounted between a central shaft carrying each gearwheel and the drive shaft, a decoupling unit for decoupling the accessory and constituted by a dog clutch having axial teeth co-operating with complementary teeth of the central shaft. The dog clutch includes internal fluting engaged with the corresponding external fluting of the drive shaft. The decoupling unit is controlled by an electric actuator acting on the movement of a plunger pin having one end co-operating with an outer helical groove in the dog clutch.

Claims

1-8. -8. (canceled)

9. A gas turbine AGB, comprising:

a front lateral face;

a rear lateral face opposite from the front lateral face;

a peripheral rim closing the box;

at least one gear train made up of a plurality of gearwheels meshing together, each gearwheel being carried by a central shaft held at each of its two ends by a respective rolling bearing and designed to be coupled to a drive shaft, for driving an accessory; and

decoupling means, mounted between said central shaft and said drive shaft, for decoupling said accessory and including a dog clutch having axial teeth co-operating with complementary teeth of said central shaft, said dog clutch including internal fluting engaged with the corresponding external fluting of said drive shaft,

wherein said decoupling means are controlled by an electric actuator acting on the movement of a plunger pin having one end co-operating with an outer helical groove in said dog clutch.

10. The AGB according to claim 9, wherein said accessory is an IDG or a VFG.

11. The AGB according to claim 9, wherein said drive shaft is supported in said central shaft by two bearings.

12. The AGB according to claim 9, further comprising a return spring bearing firstly against an internal groove of said dog clutch and secondly against an external lateral rim of said drive shaft in order to hold the dog clutch in the coupling position so long as said plunger pin is withdrawn from said outer helical groove.

13. The AGB according to claim 12, wherein said return spring is a leaf spring.

14. The AGB according to claim 9, wherein said plunger pin has an end extending outside the AGB in order to enable coupling and/or decoupling of said accessory to be controlled manually.

15. The AGB according to claim 9, wherein said electric actuator is controlled by the pilot or from a control module.

16. The AGB according to claim 9, wherein said central shaft is held at each of its two ends by a respective rolling bearing.