This document discusses lubrication systems. It describes the purposes of lubrication as reducing friction, providing cooling, sealing, and cleaning effects. It outlines different types of lubricants including animal fat, vegetable lubricants, and mineral lubricants obtained from crude petroleum. Good lubricating oils should have sufficient viscosity, remain stable under changing temperatures, and keep parts clean without corroding metals. Lubrication theories include fluid film theory and boundary layer theory. Engine lubrication systems can be splash systems, forced feed systems, or a combination of both.
3. TYPES OF LUBRICANTTYPES OF LUBRICANT
ANIMAL FATANIMAL FAT == It does not stand muchIt does not stand much
heat . It becomes waxy and gummyheat . It becomes waxy and gummy
which is not very suitable for machinewhich is not very suitable for machine
VEGITABLE LUBRICANTVEGITABLE LUBRICANT == It is obtainIt is obtain
from seed, fruit and plants and are usedfrom seed, fruit and plants and are used
as lubricant in small simple machineas lubricant in small simple machine
EX. cotton oil, olive oil, castor oil etcEX. cotton oil, olive oil, castor oil etc
MINERAL LUBRICANTMINERAL LUBRICANT== It is most popularIt is most popular
for engine and machine ,obtained fromfor engine and machine ,obtained from
Crude petroleum found in natureCrude petroleum found in nature
4. PROPERTISE OF GOODPROPERTISE OF GOOD
LUBRICATING OILLUBRICATING OIL
It should have sufficientIt should have sufficient
viscosity to keep the rubbingviscosity to keep the rubbing
surface apart.surface apart.
It should remain stable underIt should remain stable under
changing temperature.changing temperature.
It should keep lubricated partsIt should keep lubricated parts
clean.clean.
It should not corrode metallicIt should not corrode metallic
surface