发动机主轴承和附件传动装置.docVIP

发动机主轴承和附件传动装置 Reviews Have a general revision of the vocabularies and sentences of last text. About the Manual Ask the students to read the Manual. ENGINE - MAIN ENGINE BEARINGS General Five main engine bearings hold the N1 shaft and the N2 shaft. Numbers from 1 to 5 identify the engine bearings. Ball bearings absorb the axial and the radial loads from the shafts. Roller bearings absorb only radial loads. The main engine bearings are in two sump cavities. The sump cavities are the forward sump and the rear sump. Main Engine Bearings The number 1 and the number 2 bearings hold the front of the N1 shaft. One ball bearing and one roller bearing are the number 3 bearing assembly. Both number 3 bearings hold the front of the N2 shaft. The number 4 bearing holds the rear of the N2 shaft. The number 5 bearing holds the rear of the N1 shaft. The number 1, 2, and 3 bearings are in the forward sump. The number 4 and 5 bearings are in the rear sump. ENGINE – ACCESSORY DRIVE - COMPONENT LOCATIONS General The accessory gearbox (AGB) is on the left side of the engine, on the fan inlet case. The AGB sends torque from the N2 rotor through spur gears to turn the engine and airplane accessories. They are line replaceable units. You get access to the AGB and the accessories when you open the left fan cowl. Accessories Locations These engine and airplane accessories are on the front face of the AGB: * EEC alternator * N2 sensor * Hand cranking pad * Engine air starter * Integrated drive generator (IDG) * Hydraulic pump. These engine accessories are on the rear face of the AGB: * Fuel pump package (fuel pumps, HMU, and main oil/fuel heat exchanger) * Lubrication unit * Scavenge oil filter. Training Information Point You use the hand cranking pad to turn the N2 rotor during borescope inspection. Key Vocabularies Design different activities to make the Ss remember the vocabularies in class. bearing sump cavity AGB hydraulic pump Key Sentences Make the Ss know ho