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How Oil Ageing Changes Gear Wear in Geared Aircraft EnginesGeared aircraft engines depend on a compact transmission to transfer substantial power at high rotational speed. The oil film inside that gearbox has to…
Using Contact Pattern Analysis To Validate Gear Alignment Under Assembly ToleranceA gearbox for a geared aircraft engine must transfer substantial torque through compact, lightweight components while operating at high rotational speed. Small…
Managing Thermal Mismatch In Geared Aircraft Engine GearboxesA study on the thermal expansion mismatch between steel gears and aluminum housings reveals a design issue that can influence efficiency, durability, noise,…
Strengthening Thin-Walled Shafts Through Spline Profile ShiftIn a geared aircraft engine, a spline connection must transmit substantial torque through a compact and lightweight shaft. The involute profile shift selected…
Quieting counter-rotating aircraft gearboxes with mesh phasingWhen two rotors spin in opposite directions inside a power reduction gearbox for a modern aero-engine, the tooth engagements at each stage march to their own…
Predicting Raceway Stresses with Finite Element SubmodelingIn geared turbofan architectures, bearing raceways operate at extraordinary contact pressures while spinning well above 30,000 rpm. Predicting those stresses…
How Gear Tip Relief Shapes Transmission Error Across TorqueIn a geared aircraft engine, the tooth profile has to transmit substantial power while keeping vibration, noise and local stress within acceptable limits. Gear…
Oil Additives and Gear Surface Finish in Aerospace GearboxesA geared aircraft engine asks its reduction gearbox to transmit substantial power through a compact, highly loaded mesh. The result is a tightly connected…
Optimizing Sun Gear Shafts for Torsional Stiffness and SpeedA geared aircraft engine depends on a reduction gearbox to transfer power at high rotational speed while allowing the propeller or fan to operate at a more…
Planet Gear Bearing Clearance In High-Speed PlanetariesPlanetary gearboxes are attractive for geared aircraft engines because several planets can share torque around a compact sun gear and ring gear. That…