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Millwright Year 2 > Bearings > Flashcards

Bearings Flashcards

1
Q

What are the two types of basic bearings?

A

Friction and Anti-Friction.

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2
Q

What are three other names of Friction bearings?

A
  • plain bearings
  • sleeve bearings
  • journal bearings
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3
Q

What type of contact exists between a Friction bearing and the shaft?

A

Sliding.

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4
Q

What type of contact is between an Anti-Friction bearing and the shaft?

A

Rolling.

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5
Q

What is used in Anti-Friction bearings that creates rolling contact?

A
  • balls
  • needles
  • rollers (cylindrical - spherical - tapered)
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6
Q

What is the outer casing of a bearing referred to as?

A

Housing or Pillow Block.

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7
Q

What are the three general styles of Joint design bearings?

A
  • flat joint
  • gib joint
  • angle joint
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8
Q

What is Babbitt?

A

Common anti-friction lining material for bearings.

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9
Q

What must be done to keep the shaft from binding after a bearing has been babbitted?

A

Relieve the corners.

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10
Q

What is cut into a Babbitt for lubrication?

A

Oil Groove.

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11
Q

Where should the Oil Groove be cut in a Babbitt bearing?

A

In the unloaded section.

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12
Q

What are Shells?

A

Two piece liners installed in a bearing housing.

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13
Q

What three common ways to hold Shells in position?

A
  • dowels
  • pins
  • notch
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14
Q

What is Crush?

A

The small amount of Shell that sits above the face of the bearing. When the bearing is assembled the shell is forced down into full contact with the housing.

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15
Q

When using Friction bearings what is used to control Thrust (axial movement)?

A

Thrust Washer and/or Ball Thrust Bearing.

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16
Q

What is End Float?

A

The amount a shaft moves axially in a bearing.

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17
Q

What are the three types of load applied to a bearing?

A
  • radial
  • thrust (axial)
  • angular (both radial and axial)
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18
Q

How is the bore of a bearing indicated?

A

The last two digits of the bearing number.

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19
Q

Up to 20mm what is the bore designated as?

A 
00 = 10mm
01 = 12mm
02 = 15mm
03 = 17mm
20
Q

After what size is the bore diameter directly included in the bearing number?

A

480mm (6296).

Example of a 500mm. 62/500

21
Q

Who standardizes clearances for bearings?

A

ISO

22
Q

What is Push fit?

A

Means the bearing is installed by hand with no mechanical aids.

23
Q

What is Creep?

A

The very slow rotation of the push-fit bearing race.

24
Q

What are four ways to heat a bearing for installation?

A
  • an oven
  • heat lamp
  • induction heater
  • oil bath
25
Q

What is Positive Keeping?

A

Using a device to hold a bearing in place.

26
Q

What is used on the outer race for positive position?

A
  • end caps with or without shims

- on small diameter bearings a snap ring is used

27
Q

What is used on the inner race for positive positioning?

A
  • snap ring placed in a groove in the housing

- locknut and washer

28
Q

How is Float in a shaft prevented?

A

By having only one bearing in the shaft assembly axially fixed.

29
Q

Bearings that are not Fixed are called what?

A

Free or Floating.

30
Q

What are the three basic arrangements of Angular Contact Bearings?

A
  • back to back (push fit)
  • face to face (push fit)
  • tandem (press fit)
31
Q

What are two types of Split Bearings?

A

Horizontal and Vertical.

32
Q

What type of bearing sits 90° to the shaft?

A

Flange Bearing.

33
Q

What are your most important consideration when selecting a bearing?

A
  • bearing type
  • temperature
  • axial/radial load
  • type of setup
34
Q

What is Oscillating Load?

A

When the load shifts through an arc less than 180°.

35
Q

What is Reciprocating Load?

A

When the load shifts 180° from one side of the bearing to the other.

36
Q

What is the purpose of a Spherical Seat?

A

Allows the bearing to align its bore during installation.

37
Q

What is a Floating Bushing?

A

An outer bushing with a loosely fitted inner bushing?

38
Q

What is Oil Whirl and Oil Whip?

A

It is the breakdown of the oil wedge.

39
Q

What is a Hydrostatic Bearing?

A

A bearing that depends on an external pump to supply lubricant to support the shaft.

40
Q

What is a Hydrodynamic Bearing?

A

A bearing that depends on the speed of the rotation of the shaft to drag oil into the loaded area.

41
Q

What is Compressive Strength?

A

The strength of bearing material to support loads at maximum operating temperature.

42
Q

What is Fatigue Resistance?

A

Is the resistance of bearing material to resist cracking and flaking.

43
Q

What is Embeddability?

A

The ability of a bearing material to resist contaminants without failing.

44
Q

What is Deformability?

A

The ability of the bearing material to yield to misalignment or imperfections in the shaft.

45
Q

What is Wetability?

A

The ability of a bearing material to absorb lubricant.

46
Q

What is Spread?

A

The amount that the insert diameter is greater than the bearing housing diameter.

Millwright Year 2 (7 decks)

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