Scribd
Upload
86 views8 pages

Lubrication: Md. Al Amin Hossain Lecturer (ME)

The document discusses lubrication in internal combustion engines. It defines lubrication as using a substance like oil between sliding surfaces to mitigate friction. Lubrication is important to minimize friction, support rotating shafts, seal piston rings, remove heat, and coat engine components with an oil film. Good lubricant properties include proper viscosity, resistance to oxidation and carbon formation, corrosion inhibition, and foaming resistance. Lubrication systems are classified as wet sump or dry sump. Wet sump systems dip engine parts in the oil for lubrication, while dry sump systems use separate oil pumps and reservoirs to maintain consistent oil pressure.

Uploaded by

SaHaria Sajib
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
86 views8 pages

Lubrication: Md. Al Amin Hossain Lecturer (ME)

The document discusses lubrication in internal combustion engines. It defines lubrication as using a substance like oil between sliding surfaces to mitigate friction. Lubrication is important to minimize friction, support rotating shafts, seal piston rings, remove heat, and coat engine components with an oil film. Good lubricant properties include proper viscosity, resistance to oxidation and carbon formation, corrosion inhibition, and foaming resistance. Lubrication systems are classified as wet sump or dry sump. Wet sump systems dip engine parts in the oil for lubrication, while dry sump systems use separate oil pumps and reservoirs to maintain consistent oil pressure.

Uploaded by

SaHaria Sajib
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 8

Lubrication

by

Md. Al Amin Hossain


Lecturer(ME)

Department: Textile Engineering


Green University Bangladesh, Dhaka

1
Learning Outcomes

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
Lubrication:

 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.

2
Importance of lubrication:

• 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
Properties of lubricant

 Proper viscosity

 Viscosity index and numbers


3
 Resistance to carbon formation and oil oxidation.

 Corrosion and rust inhibitors

 Foaming resistance

 Detergent-dispersants

 Extreme pressure resistance.


Classification of Lubrication:

1.Dry sump lubrication

2.Wet sump lubrication

4
Wet Sump Lubrication:

Engine parts are exposed to /dipped in the lubricating oil for getting lubricated.

5
Dry Sump Lubrication:

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.
Home Work:

1. Differentiate between dry sump and wet sump lubrication system.


2. Draw the schematic of dry sump and wet sump lubrication system.
6
7
8

You might also like