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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.

25
What are the best 2 ways to heat a bearing?
The best is a bearing oven And the next best is a Oil Bath
26
A bearing with a “K” at the end of its code means the bearing is what?
A Taper Bore Bearing with a Taper of 1/12.
27
A bearing with the number notation “K30” at the end means what?
The bearing is a taper bore bearing with a 1/30 taper.
28
Do you libricate Babbitt Bearings? What type of bearing is a Babbitt Bearing? What does this allow for?
- Yes - Friction Bearing - Axial movement, for adjusting impeller clearances.
29
Running/mounted internal clearance should be normally less than what % of unmounted DC?
50%
30
What type of bearing has no diametrical clearance?
Needle Roller Bearings
31
What bearing should not take axial thrust loads?
Needle Roller bearings.
32
Shims on bearings end caps are usually used to what?
Introduce positive clearance.
33
Spherical Roller Bearings are used mainly in applications having what speeds and loads?
High loads (large surface area) and low speeds
34
Answer
A)
35
What is a Bearing Housing also called?
Pillow Block
36
Name Three other names to call a Friction Bearing.
Journal Bearing Plain Bearing Sleeve Bearing
37
Do Frictional Beaings have a large area of contact or small?
Large compared to Anti-friction Bearings.
38
What is the nominal size of a bearing?
The bore size of the bearing.
39
What are Solid Bearings? What speeds and loads are they used with? Where is the load designed to be in the bearing usually?
- 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
What do Gib joints in a Split Bearing allow?
Limited Side loading.
41
Which Fiction Bearing liner material is common in hydraulic pumps?
Aluminum
42
Which is the hardest and toughest babbit for a friction bearing? - Lead Based Babbit - Tin Based Babbit
Tin Based Babbit
43
What percentage of Tin is in a Tin Based Babbit Line? What is the liner called when the percentage id higher?
- Up to 90% - Nickel Babbit
44
Can you over hear babbit?
Yes, past pour point (650F - 700F) is too hot and will reduce service life.
45
How is babbit held in place in the housing?
By keys which are formed in grooves or slots in the casting.
46
What is it called when moisture/water causes explosions during babbit pouring?
Blow Back
47
What temp do you have to heat a bearing up to to remove all moisture before pouring babbit?
94C or 200F
48
What does relieved mean when refering to the fitting process of a babbit bearing?
Bottom edges are removed to prevent binding.
49
What is Chamfering when regarding babbit bearings?
Filed channels that direct lubricant to the shaft. Top is always chamfered while Bottom is only for heavy loads.
50
Where should you never cut grooves in babbit bearings?
In the loaded areas
51
What other than relieving and chamfering prevents binding in a babbit bearing?
The shims which provide a small clearance between shaft and bearing.
52
What are three ways of checking clearance between a babbit bearing and the shaft?
Lead Wire Plastigage Dial Indicator

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