PRINSIP TRIBOLOGIPRINSIP TRIBOLOGI• DRY SLIDING

• FLUID-FILM LUBRICATION

-Hydrodynamic Lubrication

- Squeeze Film Lubrication

- Pressurized Lubrication

•ELASTODYDRODYNAMICS LUBRICATION (EHL)

- Hard EHL

- Soft EHL

DRY SLIDINGW

U1

U2

W

U1

U2

- Graphite- Molibdenum Disulfide- PTFE Plastic- Sulfur or Phosphorus-rich Layer

Fluid-Film Lubrication

Hydrodynamic Lubrication

WW

Journal Bearing Thrust Bearing

Load Load on Projected Area

Lubricant M.Pa psi

Oil    

- Steady Radial Load 1.4 - 2.8 200 - 400

- Steady Thrust Load 2.1 - 4.8 300 - 700

- Shock and Dynamic Loads 17 - 34 2500 - 5000

Water 0.2 - 0.3 25 - 50

Air 0.02 3

     

Bearing    

Oil Lubricated    

- Steady Load    

- Electric Motor 1.4 200

- Turbine 2.1 300

- Rail Road Car Axles 2.4 250

- Dynamic Load    

- Automobile Engine Main Bearing 24 3500

- Automobile Connecting-rod Bearing 34 5000

- Stell Mill Roll Necks 34 5000

- Water 0.2 30

- Air Bearing 0.02 3

Hydrodynamic LoadHydrodynamic Load

Squeeze Film

Oscillating LoadOscillating Load

Pressurized Feed Pressurized Feed

LoadLoad

Ball Bearing

Contact Point

Elastohydrodynamic Lubrication

Distribusi TekananDistribusi Film Thickness

Boundary Lubrication

Severity

N and Viscosity

Pressure

Insufficient Oil Film

Contact Area

Deforfation & Temperature

Coeff.of Friction

.N/p

Coe

ff. O

f F

rict

ion,

f

Full Film

MixedB

oun

dary

Lub

rica

tion

0.0010.03

0.1