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Bearings Flashcards

1
Q

What is a raidal load?

A

A load that is perpendicular to the shaft.

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2
Q

What is a Axial load?

A

A load that is parallel to the shaft.

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3
Q

What are two main types of Roller Element Bearings?

A

Ball Bearing
Roller Bearing

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4
Q

Define what a bearings “Races” are.

A

The inner and outter metal covers which the roller elements roll on.

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5
Q

What is the most used Type of Ball Bearing?

A

Deep Groove Ball Bearing

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6
Q

What holds each ball bearing in place seperate from the others

A

Retainers

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7
Q

What is special about an angular contact ball bearing

Why?

A

The race, inner and outer races are angled.

To handle greater amounts of axial loads in addition to radial loads

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8
Q

What are some qualities of self aligning ball bearings?

A

Inner ring has a concave shape allowing alignment. Two sets of deep groove balls.

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9
Q

What is unique about Thrust Ball Bearing

A

They are held together.

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10
Q

What are qualities of Roller Bearings?

What are they good for?

A
  • Maintain accurate alignment over long peroid of time and can carry heavy momentary load
  • Machinery with frequent starts and stops.
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11
Q

Do Ball Bearings or Roller Bearings have higher load carrying capacity?

Why

A
  • Roller bearrings
  • More surface area in contact with races.
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12
Q

What is this?

A
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13
Q

What is this?

A
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14
Q

What is this?

A
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15
Q

The more tapered a bearing is the more _______ it can handle.

A

Axial load

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16
Q

What is this?

A
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17
Q

What are Needle bearings only suitable for?

A

Radial Loads

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18
Q

What is this?

A

Plain Bearing

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19
Q

What is this?

A

Fluid Bearing

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20
Q

Name a friction style bearing.

A

Babbit Bearing

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21
Q

What is Diametral Clearance?

When should you check this? And how?

A
  • The gaps between roller elements in a bearing.
  • Everytime you install a bearing. With feeler gauges.
22
Q

What is the maximum temp a bearing can be heated to?

A

250 F
or
121 C

23
Q

What are some other names for Babbit Bearings?

A

Plain Bearing, Friction Bearing

24
Q

High speed bearings should have how much oil when machine is not running.

A

10% - 15%

25
Q

What are the best 2 ways to heat a bearing?

A

The best is a bearing oven

And the next best is a Oil Bath

26
Q

A bearing with a “K” at the end of its code means the bearing is what?

A

A Taper Bore Bearing with a Taper of 1/12.

27
Q

A bearing with the number notation “K30” at the end means what?

A

The bearing is a taper bore bearing with a 1/30 taper.

28
Q

Do you libricate Babbitt Bearings?

What type of bearing is a Babbitt Bearing?

What does this allow for?

A
  • Yes
  • Friction Bearing
  • Axial movement, for adjusting impeller clearances.
29
Q

Running/mounted internal clearance should be normally less than what % of unmounted DC?

A

50%

30
Q

What type of bearing has no diametrical clearance?

A

Needle Roller Bearings

31
Q

What bearing should not take axial thrust loads?

A

Needle Roller bearings.

32
Q

Shims on bearings end caps are usually used to what?

A

Introduce positive clearance.

33
Q

Spherical Roller Bearings are used mainly in applications having what speeds and loads?

A

High loads (large surface area) and low speeds

34
Q

Answer

A

A)

35
Q

What is a Bearing Housing also called?

A

Pillow Block

36
Q

Name Three other names to call a Friction Bearing.

A

Journal Bearing
Plain Bearing
Sleeve Bearing

37
Q

Do Frictional Beaings have a large area of contact or small?

A

Large compared to Anti-friction Bearings.

38
Q

What is the nominal size of a bearing?

A

The bore size of the bearing.

39
Q

What are Solid Bearings?

What speeds and loads are they used with?

Where is the load designed to be in the bearing usually?

A
  • A solid one piece friction bearing housing.
  • Used where speed and load are low.
  • Load is applied to the top part of the bearing.
40
Q

What do Gib joints in a Split Bearing allow?

A

Limited Side loading.

41
Q

Which Fiction Bearing liner material is common in hydraulic pumps?

A

Aluminum

42
Q

Which is the hardest and toughest babbit for a friction bearing?

  • Lead Based Babbit
  • Tin Based Babbit
A

Tin Based Babbit

43
Q

What percentage of Tin is in a Tin Based Babbit Line?

What is the liner called when the percentage id higher?

A
  • Up to 90%
  • Nickel Babbit
44
Q

Can you over hear babbit?

A

Yes, past pour point (650F - 700F) is too hot and will reduce service life.

45
Q

How is babbit held in place in the housing?

A

By keys which are formed in grooves or slots in the casting.

46
Q

What is it called when moisture/water causes explosions during babbit pouring?

A

Blow Back

47
Q

What temp do you have to heat a bearing up to to remove all moisture before pouring babbit?

A

94C or 200F

48
Q

What does relieved mean when refering to the fitting process of a babbit bearing?

A

Bottom edges are removed to prevent binding.

49
Q

What is Chamfering when regarding babbit bearings?

A

Filed channels that direct lubricant to the shaft. Top is always chamfered while Bottom is only for heavy loads.

50
Q

Where should you never cut grooves in babbit bearings?

A

In the loaded areas

51
Q

What other than relieving and chamfering prevents binding in a babbit bearing?

A

The shims which provide a small clearance between shaft and bearing.

52
Q

What are three ways of checking clearance between a babbit bearing and the shaft?

A

Lead Wire
Plastigage
Dial Indicator

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