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M6 > 6.8 > Flashcards

6.8 Flashcards

1
Q

What does a bearing do ?

A

Constrains relative motion to Desired motion and reduces friction between moving parts.

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2
Q

What does the design of a bearing provide ?

A

Provides linear movement / rotation around fixed axis

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3
Q

What is the role of gears ?

A

Transmits power, change drive directions and increases / decreases rotational speed.

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4
Q

What’s the two major groups of bearings ?

A
  1. Plain - made up of a plain cylinder or flat washer
    2.Rolling - Made up of rolling components
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5
Q

What two good characteristics does bearings have ?

A
  1. Made from strong material
  2. Provides Quiet and efficient operation
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6
Q

What’s the two forces acting upon a bearing ?

A
  1. Axial
  2. Radial
    ( bearing can have combo of both )
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7
Q

What distributes lubricant over all of the bearing ?

A

Oil grooves/wells

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8
Q

What are synthetic bearings lubricated with ?

A

Water, whicch also acts as coolant

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9
Q

With sliding bearings, why is grease lube used ?

A

Used on stressed bearings to with large bearing play.

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10
Q

What loads does plain bearings take ?

A

Radial ( journal )

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11
Q

When are plain bearings used ?

A

When load is light a motion is continuous.

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12
Q

What’s pivot ( axial ) bearings used for ?

A

Longitudinal forces

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13
Q

What’s 3 advantages of roller and ball bearings ?

A
  1. Almost eliminate all friction
  2. Carry heavy loads
  3. Don’t heat as much as plain bearings
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14
Q

What the 5 types of anti-friction bearings ?

A
  1. Tapered
  2. Ball
  3. Needle
  4. Cylindrical
  5. Spherical
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15
Q

What separates the different raceways ?

A

Cage

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16
Q

What’s the raceways made from on anti-friction bearing ?

A
  1. Chromium steel
  2. Chromium - nickel steel
    ( tracks are polished )
17
Q

What is the distinction between ball bearings and roller bearings ?

A

Ball bearings - low starting resistants, and high rotational speed.
Roller bearings - are used if stress is too much for ball bearings

18
Q

What are the major components of ball bearing ?

A
  1. Outer ring
  2. Inner ring
  3. Rolling elements
  4. Retrainer
19
Q

What’s the shields and sealants inside the races used for ?

A

To retain lubricant and protect bearing from contamination.
( races can be machined externally or internally to make them self angling )

20
Q

What are ball bearings used for ?

A

Accessory drives, gearings
( anywhere narrow bearing is required )

21
Q

What load is ball bearings poor at withstanding due to their point contact

A

Oscillating loads.

22
Q

When is cylindrical bearings commonly used ?

A

Non-locating positions

23
Q

What two types of bearings are placed at the end of shaft ?

A
  1. Locating (fixed)
  2. Non-locating (floats)
24
Q

What does the cylindrical bearings line contact with races allow it to do over ball bearings ?

A

Carry more radial loads.

25
Q

Why does the cylindrical bearing have lower lad capacity ?

A

Has heavier cage and few rollers in order to retain the rollers

26
Q

What properties does a needles bearings long thin rollers give it ?

A

Very high radial load capacity

27
Q

True or false, spherical roller bearings are self aligning ?

A

True
- self aligning allows it to make minor angle adjustments between shaft and housing.

28
Q

What causes the skidding of rollers in a spherical roller bearing ?

A

Rolling motion only occurs in two contact points on each roller

29
Q

What load does a spherical roller bearing take ?

A

Radial
- but stress isn’t evenly distributed when under heavy loads .

30
Q

When is a spherical bearing best suited to be used?

A
  1. Risk of misalignment while assembly
  2. Where speed isn’t exacting
31
Q

4 Advantage of tapered roller bearing ?

A
  1. Less vulnerable to contaminants due to natural pumping action
  2. Low fiction
  3. Loner service life
  4. Can take radial and axial loads
32
Q

2 Advantages of air bearings ?

A
  1. Zero- friction
  2. Don’t need lubricant and don’t wear
33
Q

How’s air bearings fluid film created ?

A

By applying flow of air through bearing face and into bearing gap.

34
Q

What 3 bearings are designed purely for thrust loads ?

A
  1. Roller
  2. Ball
  3. Needle
35
Q

How is a thrust bearing often mounted ?

A

Vertically
- this supports heavy machinery.
- used on propellers as well.

36
Q

What loads do thrust bearings take ?

A

Axial loads, Limited radial loads
(They have high load capacity)

37
Q

If radial load is expected, what is placed next to the thrust bearing ?

A

Another bearing

38
Q

What is the function a bearing ?

A

Reducer friction between moving parts

M6 (6 decks)

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