15.10 Lubrication System

http://part66.blogspot.com/

SYSTEM OPERATION

SCHEMATIC DIAGRAM

FULL FLOW OIL SYSTEM

TYPE OF BEARING LUBRICATION

• Spray Jet/pressure Fed (direct oil to bearing)• Splash Oil (for light loading bearing)• Metered Oil (supply right quantity oil depend

on speed of engine)• Film Lubrication ( surface separated by oil)• Squeeze film (minimise the effect of dynamics

loads)

OIL TANK

• Clasified by hot tank(oil cooler downstream) or cold tank(oil cooler upstream)

• Located aboved the pump assy (for +ve flow)• Either vented or pressurize( for +ve flow)• Component :– Anti siphon tube – Gravity filler (prevent major loss of oil due to not properly

fitted cap)– Oil quantity transmitter (for indicator EACAS)– Pressure fill and overflow port (provide option filling tank

using presurize cart)

OIL PUMPS

• To supply oil under pressure• Type : – Vane Pump (low pressure)– Gerotor Pump (high pressure)– Gear type pump (high pressure)

Vane Pump

Gerotor Pump Gear Pump

In

Out

FILTER• Purpose to prevent any material (debris) other than fluid to pass

through.• Type :

– Cleanable Screen Filter • From woven wire and reuse after cleaning• Filter above 40micron

– Fiber filter• Can screen down to 15 micron

– Threrad filter• Last chance filter fit before bearing chamber

– Scavenge Screen Filter• Fit to individual scavenge line• To catch large debris• The base is fit with magnetic chip detector• Indicate when detect metal like pop out

FUEL COOL OIL COOLERS (FCOC)• Purpose : Cool the oil and warm the fuel• Located in fuel system immediately before LP

fuel filter

Air-Oil Seperation

• Oil gain air after presurisation at the return oil.• Deareator is fix at top of oil tank on the return

oil to seperate/baffle air from oil.• Air is vented or regulated to maintain +ve

pressure.

MAGNETIC CHIP DETECTOR (MCD)• Purpose is to attract and hold ferrous metal

particles in the system• Can cause wear or damage to system• Need to inspect frequently the present of grey

metallic paste.• Other type is Indicating Magnetic Chip Detector and Pulse Chip Detector

ANTI STATIC LEAK CHECK VALVE

• Keep presurize bearing with oil after engine shut down

• Use anti siphon tubes with check valve

Shiphon valve