Lubrication | Study On Lubrication Presented by Sir Al-Amin Hossain Lecturer Green University Of Bangladesh

1. Lubrication
by
Md. Al Amin Hossain
Lecturer(ME)
Department: Textile Engineering
Green University Bangladesh, Dhaka
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2. Learning Outcomes
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At the end of today’s class, learners will be able to
Define lubrication
Realize the importance of lubrication in Internal
Combustion Engine
Describe the properties of lubricant
Classify lubrication system for an engine

3. Lubrication:
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 When two surface slides against each other, friction
occurs.
 To mitigate this friction, a substance such as oil is used
between the sliding surfaces.
 This process is known as lubrication.
 The substance/ oil is commonly known as lubricant.

4. Importance of lubrication:
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• Lubrication: to minimize friction and hydro-dynamically
support rotating shafts (the primary task of an engine oil).
• Sealant: to help the piston rings in the engine cylinder.
• Coolant: to remove heat from hot engine components.
• Cleaning agent: to neutralize acids and sludge formed by blow
by gases.
• Coating: to cover engine moving components with an oil film
even when they are subjected to high thrust loads

5. Properties of lubricant
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 Proper viscosity
 Viscosity index and numbers
 Resistance to carbon formation and oil oxidation.
 Corrosion and rust inhibitors
 Foaming resistance
 Detergent-dispersants
 Extreme pressure resistance.

6. Classification of Lubrication:
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1.Dry sump lubrication
2.Wet sump lubrication

7. Wet Sump Lubrication:
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Engine parts are exposed to /dipped in the lubricating oil for
getting lubricated.

8. Dry Sump Lubrication:
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The dry-sump system uses two or more oil pumps and a separate oil
reservoir, as opposed to a conventional wet-sump system. Improved
engine reliability due to consistent oil pressure.

9. Home Work:
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1. Differentiate between dry sump and wet sump lubrication system.
2. Draw the schematic of dry sump and wet sump lubrication system.

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