prinsip tribologi dry sliding fluid-film lubrication -hydrodynamic lubrication - squeeze film...
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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
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