A gas turbine engine is provided that includes a gearbox operable to selectively couple a relatively high pressure spool shaft to a relatively low pressure spool shaft. In one form the gearbox includes a cone clutch that engages a male member of the cone clutch to a female member of the cone clutch
A gas turbine engine is provided that includes a gearbox operable to selectively couple a relatively high pressure spool shaft to a relatively low pressure spool shaft. In one form the gearbox includes a cone clutch that engages a male member of the cone clutch to a female member of the cone clutch during an engine start of the gas turbine engine. A relatively high pressure of a working fluid can be used to bring the male member and the female member together. A spring can also be used to urge the male member and the female member apart when the working fluid is at a relatively low pressure.
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1. An apparatus comprising: a multi-spool gas turbine engine having a first gas turbine engine spool shaft operable to be driven by a first turbine and a second gas turbine engine spool shaft operable to be driven by a second turbine;a first gear shaft having a first drive gear rotatably disposed wi
1. An apparatus comprising: a multi-spool gas turbine engine having a first gas turbine engine spool shaft operable to be driven by a first turbine and a second gas turbine engine spool shaft operable to be driven by a second turbine;a first gear shaft having a first drive gear rotatably disposed within a gearbox;a second gear shaft having a second drive gear, the second gear shaft rotatably disposed within the first gear shaft and rotatable about a common axis with the first gear shaft, the first and second gear shafts extending along the common axis between first and second ends and the first and second drive gears being disposed proximate one end of each corresponding gear shaft;a fluid driven actuator capable of receiving a working fluid pressurizable from a relatively low pressure to a relatively high pressure to move a movable member of the fluid driven actuator;a first friction surface rotatingly coupled with the first gear shaft and operable to move along the common axis between the first and second ends in response to the movable member of the actuator;a second friction surface rotatingly coupled with the second gear shaft and operable to be selectively engaged with the first friction surface;wherein the first and second friction surfaces are disposed proximate the other end of the first and second gear shafts opposite of the first and second drive gears;wherein the first and second drive gears are coupled with corresponding gears that are connected to the first and second spool shafts respectively; andwherein the working fluid is at the relatively high pressure during an engine start of the multi-spool gas turbine engine and is at the relatively low pressure after the engine start such that the first friction surface and the second friction surface are in an engaged position to couple the first and second spool shafts together during the engine start and are in a disengaged position when the working fluid is at a relatively low pressure. 2. The apparatus of claim 1, which further includes: an actuation housing having a working fluid cavity;an energy member coupled between a pressure piston member and the actuation housing and operable to return the pressure piston member to the disengaged position when a working fluid pressure is at a relatively low pressure; andwherein the movable member includes a pressure member having a pressure surface at least partially received in the working fluid cavity, the pressure surface operable to receive a working fluid. 3. The apparatus of claim 2, which further includes: a mechanical stop operable to limit a motion of the first friction surface and disposed in the working fluid cavity;a piston mechanical stop structure included in the pressure piston member;andwherein the mechanical stop and the piston mechanical stop structure are operable to interfere with movement of the pressure piston member. 4. The apparatus of claim 1, wherein the first friction surface and the second friction surface form a cone clutch. 5. The apparatus of claim 1, wherein the first friction surface includes a male cone clutch member and the second friction surface includes a female cone clutch member. 6. The apparatus of claim 1, wherein the first friction surface is slidingly coupled with the first gear shaft, the first gear shaft forming part of a step aside gearbox. 7. The apparatus of claim 6, wherein the first friction surface is coupled to the first gear shaft through a splined surface and the first gear shaft includes a complementary splined surface. 8. The apparatus of claim 6, wherein the first friction surface is a male cone clutch member. 9. The apparatus of claim 6, wherein the working fluid is engine oil. 10. An apparatus comprising: a gas turbine engine gearbox having a first gear shaft and a second gear shaft, each gear shaft having first and second opposing ends, the second gear shaft rotatable within the first gear shaft and operable to be selectively coupled, the first gear shaft having a first portion with a gear extending from the first end and a slidable second portion with a friction surface positioned adjacent the second end, wherein the slidable second portion is slidingly movable between the first and second ends of the first gear shaft, the second gear shaft having a first portion with a gear extending from the first end and a second portion with a friction surface positioned adjacent the second end;an actuation device having an engaged position and a disengaged position, the actuation device operable to move the slidable second portion of the first gear shaft into contact with the friction surface of the second gear shaft in the engaged position and move the slidable second portion away from the friction surface of the second gear shaft in the disengaged position; andwherein the actuation device is energized to the engaged position during an engine start of the gas turbine engine and is de-energized to the disengaged position after the engine start. 11. The apparatus of claim 10, which further includes a gas turbine engine, wherein the first gear shaft is coupled to an intermediate pressure spool shaft and the second gear shaft is coupled to a high pressure spool shaft. 12. The apparatus of claim 10, wherein the actuation device operates on the basis of a working fluid pressure and an elastic device, a relatively high working fluid pressure energizes the actuation device to the engaged position, and the elastic device de-energizes the actuation device to the disengaged position. 13. The apparatus of claim 12, wherein the friction surface of the first gear shaft forms a male member of a cone clutch, and the friction surface of the second gear shaft forms a female member of the cone clutch. 14. The apparatus of claim 10, wherein the friction surface of the first gear shaft forms a male member of a cone clutch, and the friction surface of the second gear shaft forms a female member of the cone clutch. 15. An apparatus comprising: a gas turbine engine having a first pressure spool and a second pressure spool operable to rotate independently during an operational state and to rotate together during an engine start state; anda gearbox having a means for selectively coupling the first pressure spool and the second pressure spool during the engine start state, wherein the means for selectively coupling includes first and second shafts rotatable about an axis, wherein the second shaft is positioned within the first shaft, each of the first and second shafts include friction couplings positioned at one end thereof and a gear extending from the other end thereof; wherein one of the friction couplings is moveable along the axis between the first and second ends. 16. A method comprising: supplying relatively high pressure working fluid to a chamber of a gas turbine engine gearbox clutch during an engine start sequence;rotating a first gear shaft having first and second ends with a first gear connected thereto adjacent the first end thereof;rotating a second gear shaft having first and second ends within the first gear shaft, the second gear shaft having a second gear connected thereto adjacent the first end thereof;moving a slidable portion connected to the first gear shaft between the first and second ends in response to the supplying;engaging a friction plate coupled to the slidable portion with a friction plate connected adjacent the second end of the second gear shaft to couple to the first and second gear shafts together; androtating a first pressure spool shaft of the gas turbine engine with a second pressure spool shaft of the gas turbine engine, the first pressure spool shaft rotatingly coupled to the first gear shaft and the second pressure spool shaft rotatingly coupled to the second gear shaft, wherein the first and second pressure spools are coupled together during the engine start sequence. 17. The method of claim 16, which further includes reducing the pressure in the working fluid after the engine start sequence. 18. The method of claim 17, which further includes disengaging the friction plate coupled to the slidable portion from the friction plate of the second gear shaft after the engine start sequence. 19. The method of claim 17, which further includes applying a spring force to a piston coupled to the slidable portion of the first gear shaft, the spring force urging the piston to disengage the friction plates of the first and second gear shafts.
Bart, Jacques Rene; Beutin, Bruno Albert; Morel, Patrick Charles Georges, Twin spool turbine engine with power take-off means on the low-pressure and high-pressure rotors, and power take-off module for the turbine engine.
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