Transcript Topic 4

TYPICAL OIL SYSTEMS
Jet Engines
Distribution and Lubrication
Early jet engines were total loss system
Engine Bearing
Chamber
Pump
Tank
Filter
Scavenge
Pump
SUMP
Jet engines are now
‘DRY-SUMP - RE-CIRCULATING’
Oil systems
i.e. oil was lost in the gas stream
TYPICAL OIL SYSTEM - JET ENGINE
Bearing Chambers
Front
Bearing
Chamber
Centre
Bearing
Chamber
Rear
Bearing
Chamber
Roller
Bearing
Ball Bearing
(Location Bearing)
Roller
Bearing
TYPICAL OIL SYSTEM - JET ENGINE
Notional oil system
Let’s take a closer
look at what
happens here
OIL COOLER
MCD
MCD
PRESSURE
OIL PUMP
ASSEMBLY
OIL
TANK
MCD
SCAVENGE
MASTER
MCD
TYPICAL OIL SYSTEM - JET ENGINE
Bearing Support Structure
Shaft
Oil
Supply
Scavenge
Bearing Oil Supply and Scavenge
TYPICAL OIL SYSTEM - JET ENGINE
Bearing Support Structure = static part
Pressurised
air from
compressors
Higher pressure air forced into the
Shaft = Chamber
rotating part
Bearing
prevents oil loss
Oil
Supply
Air/Oil scavenged
away to tank
TYPICAL OIL SYSTEM - JET ENGINE
Notional oil system with Air Sealing
Clean(?) Air Overboard
OIL COOLER
MCD
MCD
PRESSURE
Gearbox
Drive
Centrifugal
Breather
OIL PUMP
ASSEMBLY
OIL
TANK
MCD
SCAVENGE
MASTER
MCD
Scavenge Oil passes through
Air/Oil Separator in Oil Tank
TYPICAL OIL SYSTEM - JET ENGINE
Any Questions?