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Second Year > Lubrication > Flashcards

Lubrication Flashcards

0
Q

The 3 types of lubrication?

A
  • Full Film
  • Elasto-hydrodynamic
  • Boundary
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1
Q

Lubrication reduces friction?

A

-separating the moving surfaces with a film that has less friction than the moving surfaces

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2
Q

Full Film

A

-thick enough to completely separate the surfaces with a continuous film

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3
Q

Elasto-hydrodynamic

A
  • completely separates two surfaces and is a type of full film lubrication
  • but the two surfaces are loaded to the extent that deformation takes place in the loaded zone
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4
Q

Boundary

A
  • forms at low speeds
  • forms when viscosity is too low to support the load
  • forms if there is not enough lubricant
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5
Q

3 types of friction and anti-friction bearings?

A
  • Sliding
  • Rolling
  • Fluid
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7
Q

Sliding Friction

A

-resistance as one surface slides over another

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8
Q

Rolling Friction

A
  • the resistance to movement of one surface rolling over another
  • the deformed ball and deformed carpet as it rolls over it
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9
Q

Fluid Friction

A
  • resistance to flow within a fluid

- result of electromagnetic bonds

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10
Q

Oil Wedge

A
  • supports the shaft and relocates it within the bearing clearances
  • it forces a full film of fluid into the loaded area
  • dependant on speed, load pressure and viscosity
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11
Q

1 cause of bearing failure

A

-improper Lubrication

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12
Q

Flash Point

A

-lowest temperature at which the vapour above an oil will ignite when a flame passed over it

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13
Q

Contaminants produced by lubrication breakdown.

A

Acid, sludge, varnish

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13
Q

Functions of a lubricant

A
  • to reduce resistance
  • reduces friction
  • protects against corrosion
  • carries away heat
  • carries away contaminants
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14
Q

Viscosity Index

A
  • a number that identifies the amount of change in the viscosity of a lubricant over a temperature range
  • stability of the oil
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15
Q

Pour Point

A
  • the lowest temperature at which an oil is observed to flow

- 3 degrees above the temperature of oil that doesn’t appear to be flowing

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16
Q

Absolute viscosity

A
17
Q

Ash

A

-detergents leave this residue when oil is burned

18
Q

Block Lubrication System

A

-divider valves are stacked to form distribution blocks to deliver oil

19
Q

Oil Mist System

A
  • Above atmospheric pressure which helps keep contaminants out of the system
  • bad cause the oil turns into a mist and gets into the air
  • small high speed
20
Q

Viscosity

A
  • how thick or thin the oil is
  • measures the fluid friction
  • decreases when temperature increases
  • increases when pressure increases
  • measured at 100 degrees C
21
Q

Air Oil system

A
  • Oil pump to inject very small amounts of into oil lines
  • supplies droplets of oil along the walls of the oil lines
  • pressurizes system to prevent junk from getting in
22
Q

Oil starts to oxidize

A

55 degrees c

23
Q

Wax

A
  • in Paraffin based oil

- cause issues at high temperatures in pipelines

24
Q

Petroleum based oil

A
  • they do not wear out

- stable up to 55 degrees C

25
Q

Synthetic oil

A
  • made from at least 10 chemical based
  • wide operating temp
  • fire resistant
26
Q

Additives

A
  • 22% of the oil

- DO wear out

27
Q

TBN/TAN

A
  • TBN (total base number)
  • TAN (total acid number)
  • a drop or rise in either of these numbers indicates oxidation is happening
28
Q

Grease

A
  • liquid lubricant mixed with a thickener
  • Never mix different greases with different thickeners
  • thickeners are known as soaps
29
Q

Drop point

A

-Lowest temperature at which lubricant will begin to drip from a grease

30
Q

Molybdenum Disulphide

A

-additive of choice to make the film strong enough to support the load & separate the surfaces in a loaded zone

31
Q

Proper grease levels.

A

-the housing should be 1/3 full after the bearing is packed

32
Q

Proper oil levels in oil bath system?

A

-1/3 to 1/2 up the lowest rolling element

33
Q

What is the proper condition a coupling should be in?

A

-perfect alignment

not to company specs because the company doesn’t know what the coupling is being used for.

34
Q

More clearance between bearing and housing means what?

A

-less load on that bearing

35
Q

Naphtha Based Oil

A
  • base oil for grease

- imported

36
Q

What is the best thickener for conventional grease at high temperatures?

A

-Sodium

37
Q

Bottle Oiler

A

a bottle mounted on top of the bearing housing that rests on the surface of the shaft. Slight vibration causes oil to run down and lubricate the bearing

38
Q

Oxidation with oil

A

-it doubles every 8 degrees over 55

39
Q

CST or centistoke

A

-British unit of measure for viscosity accepted world wide

40
Q

Functions of detergents

A
  • keep out sludge and fine deposits
  • clean up existing deposits
  • control acid buildups
  • act as an anti wear additive
  • act as an anti scuff additive
  • act as a rust inhibitor

Second Year (19 decks)

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