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Seals & Lubrication

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bernard whiles

on 22 March 2013

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Transcript of Seals & Lubrication

Seals & Lubrication
LUBRICATION AND SEALS
TEST



•DEFINE “A LUBRICANT”

•NAME THE THREE TYPES OF FRICTION

•THREE BASIC FUNCTIONS OF A LUBRICANT


•NAME FOUR TYPES OF MATERIALS THAT PRODUCE LUBRICANTS


•NAME TWO LOSS METHODS AND ONE REUSABLE METHOD OF OIL APPLICATION

•STATE TWO REASONS FOR USING GREASE


•STATE THREE DISADVANTAGES OF GREASE


•STATE THREE ADVANTAGES OF OIL OVER GREASE


•STATE THREE DIS-ADVANTAGES OF OIL OVER GREASE
WHAT IS A LUBRICANT ?
A LUBRICANT IS A SUBSTANCE WHICH REDUCES THE EFFECT OF FRICTION
WHAT IS FRICTION
Friction is a force that resists the motion of an object that is in contact with another object or material.
LUBRICANTS ARE ALSO DESIGNED TO COOL, PREVENT CORROSION AND PREVENT DIRT DAMAGING COMPONENTS.
There are three major types of friction:
sliding, rolling and fluid.
The earliest recorded use of lubrication is credited to the Assyrians and the Egyptians at around 1400bc.
Palm oil and other vegetable oils were used on chariot wheel hubs to prevent charring of the wooden axles, this allowing greater speed and further distances to be traveled before having to stop to cool or repair the chariots.
A LUBRICANT SHOULD PERFORM THREE BASIC
FUNCTIONS –
1
REDUCE FRICTION
2
REDUCE HEAT
3
REDUCE WEAR
THERE ARE THREE TYPES OF LUBRICANT
1
2
3
LIQUID
SEMI-SOLID
SOLID
THERE ARE FOUR TYPES OF MATERIALS THAT PRODUCE LUBRICANTS

1 ANIMAL
2 VEGETABLE
3 MINERAL
4 SYNTHETIC
THERE ARE FOUR BASIC PROPERTIES WHICH ARE
IMPORTANT WHEN CHOOSING A LUBRICANT
VISCOSITY (thickness or resistance to flow)

FLASH POINT (the temp at which its vapour will ignite)

FIRE POINT (the temp required for a steady burn)

POUR POINT (the low temp where it ceases to flow)
THERE ARE FOUR FACTORS THAT GOVERN THE SELECTION OF A LUBRICANT
SPEED

TEMPERATURE

PRESSURE

ENVIRONMENT (ambient conditions)
oil
grease
graphite
OIL APPLICATION METHODS FALL INTO TWO GROUPS

1. LOSS METHODS

2. REUSABLE METHODS
drip feed
brush on
spray on
enclosed system
Grease
METHODS OF APPLYING GREASE
BY HAND
GREASE CUP
GREASE NIPPLE
ADVANTAGES AND DISADVANTAGES OF GREASE
DOES NOT FLOW

POOR COOLING

RESISTANT TO MOTION

PICKS UP ABRASIVES
EASIER TO CONTAIN THAN OIL

BARRIER TO CONTAMINANTS

USE IN AWKWARD TO REACH AREAS
+
_
ADVANTAGES AND DISADVANTAGES OF OIL
CAN BE RECIRCULATED

CAN BE COOLED

EASY TO REPLACE

EASY TO TOP UP

CAN BE FILTERED

WILL PASS THROUGH SMALL OPENINGS

CAN BE CHECKED FOR OIL LEVEL
HARD TO CONTAIN

CAN CATCH FIRE

CAN BE CONTAMINATED WITH WATER

OFTEN NEEDS FILTERS AND COOLERS

OFTEN RELIANT ON PUMPS
+
_
Too much oil can lead to excessive pressure build up and leaks.
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