1. Distribution and Lubrication
TYPICAL OIL SYSTEMS
Jet Engines
Distribution and Lubrication

2. TYPICAL OIL SYSTEM - JET ENGINE
Early jet engines were total loss system
Engine Bearing Chamber
Pump
Filter
SUMP
Scavenge Pump
Tank
Jet engines are now
‘DRY-SUMP - RE-CIRCULATING’
Oil systems
i.e. oil was lost in the gas stream
TYPICAL OIL SYSTEM - JET ENGINE

3. Centre Bearing Chamber Ball Bearing (Location Bearing)
Bearing Chambers
Front Bearing Chamber
Centre Bearing Chamber
Rear Bearing Chamber
Roller Bearing
Ball Bearing (Location Bearing)
Roller Bearing
TYPICAL OIL SYSTEM - JET ENGINE

4. Let’s take a closer look at what happens here
Notional oil system
Let’s take a closer look at what happens here
SCAVENGE
OIL COOLER
MCD
MASTER MCD
OIL PUMP ASSEMBLY
PRESSURE
OIL TANK
TYPICAL OIL SYSTEM - JET ENGINE

5. TYPICAL OIL SYSTEM - JET ENGINE
Bearing Support Structure
Shaft
Oil Jet
Oil Supply
Scavenge
Bearing Oil Supply and Scavenge
TYPICAL OIL SYSTEM - JET ENGINE

6. Bearing Support Structure = static part
Pressurised air from compressors
Higher pressure air forced into the Bearing Chamber prevents oil loss
Shaft = rotating part
Oil Supply
Oil Jet
Air/Oil scavenged away to tank
TYPICAL OIL SYSTEM - JET ENGINE

7. TYPICAL OIL SYSTEM - JET ENGINE
Notional oil system
with Air Sealing
PRESSURE
OIL COOLER
Clean(?) Air Overboard
MCD
MASTER MCD
OIL PUMP ASSEMBLY
SCAVENGE
Gearbox Drive
Centrifugal Breather
OIL TANK
Scavenge Oil passes through Air/Oil Separator in Oil Tank
TYPICAL OIL SYSTEM - JET ENGINE

8. Any Questions?