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M7 > 7.11 > Flashcards

7.11 Flashcards

1
Q

What are the bearings for supporting journals, destined to accept force at right angle to drilling axis?

A

Journal or Roller bearings.

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2
Q

What bearings are designed to accept forces in a longitudinal direction?

A

Pivot and Axial bearings.

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3
Q

What loads do sliding bearings resist?

A

Radial loads.

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4
Q

What are advantages of sliding bearings?

A

Operate with little noise and suitable for both slow and fast rotational journal speeds.

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5
Q

What are disadvantages of sliding bearings?

A

The have a high starting resistance and require continuous maintenance.

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6
Q

What are the 5 basic types of anti-friction bearings?

A 
Tapered Roller 
Needle
Spherical Roller
Cylindrical Roller
Ball
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7
Q

What is one of the most popular lubricants?

A

Grease.

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8
Q

Why is it bad to over grease bearings?

A

Can cause excess churning and generate extremely high temperatures.

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9
Q

What is grease applied with?

A

A grease packer.

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10
Q

What are symptoms of overheating in bearings?

A

Discolouration of the rings, balls and cages from gold to blue.

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11
Q

What temperatures can anneal the ring and ball materials in bearings?

A

400 Fahrenheit.

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12
Q

What is false brinelling?

A

Wear in a bearing from excessive vibration.

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13
Q

How does true brinelling occur?

A

When loads exceed elastic limit.

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14
Q

How do you know if true brinelling is present?

A

Indentations in the raceways which increase bearing noise and vibration.

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15
Q

How is false brinelling evident?

A

Elliptical wear marks in an axial direction, and a ring of brown debris.

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16
Q

What is fatigue failure on bearings also known as?

A

Spalling.

Fracture and removal of particles of material

17
Q

What load are angular contact bearings designed to accept?

A

Axial load in one direction.

18
Q

What is one of the leading causes of bearing failure?

A

Contamination.

19
Q

What symptoms are contamination of bearings?

A

Denting of the raceways and balls.

20
Q

What are symptoms of lubricant failure in bearings?

A

Discoloured (blue/brown) balls and tracks.

21
Q

What are signs of corrosion on bearings?

A

Red/brown areas on balls, cages and bands of ball bearings.

22
Q

How is misalignment on a bearing detected?

A

A ball wear path that is not parallel to raceways edges.

23
Q

What is fretting on a bearing?

A

Generation of fine metal particles which oxidise and leave a brown colour.

24
Q

How does fretting on bearings occur?

A

If the relative motion between mating parts is slight but continuous.

25
Q

What constant temperature do bearings have to be repaired at?

A

20 Celsius

26
Q

When do bearings have to be greased after final rinse?

A

Within 2 hours.

27
Q

What must humidity be less than for storage of bearings?

A

75%

28
Q

What is VCI for bearings?

A

Vapour Corrosion Inhibitor.

M7 (17 decks)

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