747-400 AMM 飞机维护手册 发动机 ENGINE 1(12)

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 E.  The gearbox engine accessories include an electronic engine control (EEC) alternator, lubrication and scavenge oil pump, and a main oil filter.
 F.  For additional information on the accessory drives, refer to
 AMM 72-60-00/001.

 10. Main Bearing Numbering/Compartment Locations (Fig. 17)____________________________________________
 A.  Main bearing locations are commonly referred to by number. Table 1 provides information on bearing location and type.
 ~...................................................................... | BEARING NO. | LOCATION | TYPE | ........................................................................ | 1 |LPC Turbine Shaft Coupling | Ball | ........................................................................ | 1.5 |Intermediate Case; Turbine | Roller | | |Shaft Coupling | | ........................................................................ | 2 |Intermediate Case; Rear | Ball | | |Compressor Front Hub | | ........................................................................ | 3 |Diffuser Case; Rear Compressor| Roller | | |Rear Hub | | ........................................................................ | 4 |Turbine Exhaust Case; Front | Roller | | |Compressor Drive Turbine Shaft| | 2..................…..............................…....................1
 Main Bearing Identification
 Table 1

 B.  The No. 1 bearing is a thrust bearing for the low pressure compressor (LPC). The No. 1 bearing is a split inner race, angular contact ball bearing mounted aft of the fan rotor in a relatively cool area. Lubrication and cooling oil is supplied under the inner race and introduced to the bearing through the inner race split.
 C.  The No. 1.5 bearing is a standard non-preloaded cylindrical roller bearing which radially supports the low compressor drive turbine shaft coupling. The No. 1.5 bearing is mounted at the forward end of the intermediate case. A single jet directed at the front of the seal plate provides lubrication for the bearing and the front seal. An axial scoop provides lubrication for the rear seal plate.
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NO. 1 BALL
NO. 1.5 ROLLER
BEARING
BEARING

Main Bearing Numbering/Compartment Locations
Figure 17 (Sheet 1)

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N0. 1 BEARING AREA SEAL PRESSURIZATION

L-A0462
Main Bearing Numbering/Compartment Locations Figure 17 (Sheet 2)
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N0. 1.5 BEARING AREA SEAL PRESSURIZATION

L-A0463
Main Bearing Numbering/Compartment Locations Figure 17 (Sheet 3)
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N0. 2 BALL BEARING

N0. 2 BEARING AREA SEAL PRESSURIZATION

L-A0464
Main Bearing Numbering/Compartment Locations Figure 17 (Sheet 4)
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