A turbofan engine (20; 300; 400) comprises a fan (28), a fan drive gear system (60), a fan shaft (120) coupling the fan drive gear system to the fan, a low spool, an intermediate spool, and a core spool. The low spool engages at least three main bearings of which at least two are non-thrust bearings
A turbofan engine (20; 300; 400) comprises a fan (28), a fan drive gear system (60), a fan shaft (120) coupling the fan drive gear system to the fan, a low spool, an intermediate spool, and a core spool. The low spool engages at least three main bearings of which at least two are non-thrust bearings and at least one is a thrust bearing. The fan shaft engages at least two bearings (148, 150). The core spool engages at least two bearings (250, 260). The intermediate spool engages at least two of said bearings (220, 200, 230; 220, 200, 230-2; 200, 220, 230-3).
대표청구항▼
1. A turbofan engine (20) comprising: a fan (28);a fan drive gear system (60);a fan shaft (120) coupling the fan drive gear system to the fan;a low spool comprising: a low pressure turbine (50); anda low shaft (56) coupling the low pressure turbine to the fan drive gear system;an intermediate spool
1. A turbofan engine (20) comprising: a fan (28);a fan drive gear system (60);a fan shaft (120) coupling the fan drive gear system to the fan;a low spool comprising: a low pressure turbine (50); anda low shaft (56) coupling the low pressure turbine to the fan drive gear system;an intermediate spool comprising: an intermediate pressure turbine (48); anda compressor (42);a core spool comprising: a high pressure turbine (46); anda compressor (44); anda plurality of main bearings, wherein: the low spool engages four of said main bearings, of which at least two are non-thrust bearings (170, 230, 172) and a single one is a thrust bearing (200);of said at least two non-thrust bearings engaged by the low spool, at least one is a non-thrust bearing (230) engaging the low spool and the intermediate spool;the fan shaft engages at least two of said main bearings (148, 150);the core spool engages at least two of said main bearings (250, 260); andthe intermediate spool engages at least two of said main bearings (220, 200, 230). 2. The engine of claim 1, wherein: said thrust bearing is a non-duplex ball bearing. 3. The engine of claim 1, wherein: said non-thrust bearings and said thrust bearing are rolling element bearings. 4. The engine of claim 3, wherein: said non-thrust bearings are roller bearings; andsaid thrust bearing is a ball bearing. 5. The engine of claim 1, wherein: there are exactly nine said main bearings. 6. The engine of claim 5, wherein: each of said nine said main bearings is either a single stage rolling element bearing or a multi-stage bearing wherein an interstage gap is no more than 30 mm. 7. The engine of claim 5, wherein: of the at least two bearings that engage the core spool, at least one is a non-thrust bearing and at least one is a thrust bearing. 8. The engine of claim 5, wherein: of the at least two bearings that engage the intermediate spool, at least one is a non-thrust bearing and at least one is a thrust bearing. 9. The engine of claim 1, wherein: of the at least two bearings that engage the fan shaft, at least one is a non-thrust bearing and at least one is a thrust bearing. 10. The engine of claim 9, wherein: of the at least two bearings that engage the core spool, at least one is a non-thrust bearing and at least one is a thrust bearing. 11. The engine of claim 9, wherein: of the at least two bearings that engage the intermediate spool, at least one is a non-thrust bearing and at least one is a thrust bearing. 12. The engine of claim 1 wherein: one of said at least two non-thrust bearings engaging the low spool engages a turbine exhaust frame. 13. The engine of claim 1, wherein: one of the bearings engaging the fan shaft is a thrust bearing (148) and one the bearings engaging the fan shaft is a non-thrust bearing (150). 14. The engine of claim 1, wherein: one of the bearings engaging the core spool is a thrust bearing (250) and one the bearings engaging the core spool is a non-thrust bearing (260). 15. A turbofan engine (300; 400) comprising: a fan (28);a fan drive gear system (60);a fan shaft (120) coupling the fan drive gear system to the fan;a low spool comprising: a low pressure turbine (50); anda low shaft (56) coupling the low pressure turbine to the fan drive gear system;an intermediate spool comprising: an intermediate pressure turbine (48); anda compressor (42);a core spool comprising: a high pressure turbine (46); anda compressor (44); anda plurality of main bearings, wherein: there are exactly nine said main bearings;the low spool engages three of said main bearings, of which exactly two are non-thrust bearings (170, 230-2, 172-3; 170, 230-3, 172) and a single one is a thrust bearing (200);the fan shaft engages at least two of said main bearings (148, 150);the core spool engages at least two of said main bearings (250, 260);the intermediate spool engages at least two of said main bearings (220, 200, 230-2; 200, 220, 230-3); andsaid one thrust bearing engaging the low spool also engages the intermediate shaft. 16. The engine of claim 15, wherein: said two non-thrust bearings engaging the low spool also engage a case (22). 17. The engine of claim 15 wherein: one of said at least two non-thrust bearings engaging the low spool engages an inter-turbine frame. 18. A turbofan engine (300; 400) comprising: a fan (28);a fan drive gear system (60);a fan shaft (120) coupling the fan drive gear system to the fan;a low spool comprising: a low pressure turbine (50); anda low shaft (56) coupling the low pressure turbine to the fan drive gear system;an intermediate spool comprising: an intermediate pressure turbine (48); anda compressor (42);a core spool comprising: a high pressure turbine (46); anda compressor (44); anda plurality of main bearings, wherein: there are exactly nine said main bearings;the low spool engages at least three of said main bearings, of which at least two are non-thrust bearings (170, 230-2, 172-3; 170, 230-3, 172) and a single one is a thrust bearing (200);the fan shaft engages at least two of said main bearings (148, 150);the core spool engages at least two of said main bearings (250, 260);the intermediate spool engages at least two of said main bearings (220, 200, 230-2; 200, 220, 230-3); andof the at least two bearings that engage the fan shaft, at least one is a non-thrust bearing and at least one is a thrust bearing. 19. The engine of claim 18 wherein: one of said at least two non-thrust bearings engaging the low spool engages an inter-turbine frame. 20. The engine of claim 18 wherein: one of said at least two of said main bearings engaging the intermediate spool is a non-thrust bearing engaging an inter-turbine frame.
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이 특허에 인용된 특허 (5)
Sheridan William G. (Southington CT) Pagluica Gino J. (Manchester CT), Coupling system for a planetary gear train.
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