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M6 Resit > 6.8 Bearings✅(3) > Flashcards

6.8 Bearings✅(3) Flashcards

1
Q

A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts (T or F)

A

T

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2
Q

What are bearings in aircraft components designed to do

A
  • produce minimum friction
  • have maximium wear resistance
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3
Q

What are the 2 major groups of bearings?

A
  • Plain bearings
  • Roller bearings
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4
Q

The 2 groups can be further sub-divided into another 2 major categories which are?

A
  • ball bearings
  • roller bearings
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5
Q

What is a plain bearing

A
  • no moving parts
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6
Q

What is a roller bearing

A
  • has enclosed and hardened rolling components that roll in inner and outer cases
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7
Q

A good bearing has 2 characteristics

A
  • strong material (move with minimum wear and friction)
  • Provide quiet and efficient operation
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8
Q

What are axial/thrust loads

A
  • acting along the supported shaft (pulling/pushing the shaft)
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9
Q

What are radial/journal loads

A
  • acting at right angles to the shaft (e.g. vertical (hanging) weight on horizontal shaft
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10
Q

Can a bearing have a combination of both loads during operation?

A

Yes

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11
Q

What must bearings require to reach long service lives?

A
  • adequate lubrication
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12
Q

What are synthetic bearings often lubricated with

A

water

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13
Q

The water in a synthetic bearings acts as a lubricant and what else

A

coolant

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14
Q

With sliding bearings, grease lubrication is usually only used for strongly stressed bearings (T or F)

A

T

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15
Q

What loads are plain bearings designed to take

A

radial loads (sometimes called journal loads)

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16
Q

Plain bearings are normally used where loads are relatively light and the motion is continuous (T or F)

A

T

16
Q

Why have anti-friction bearings replaced plain bearings

A

Less maintenance required

17
Q

Bearings for pivot journals, which are designed to accept forces in a longitudinal direction is called what

A

pivot bearings or axial bearings

18
Q

What are the 5 types of anti-friction bearings

A
  • Tapered
  • Needle
  • Ball
  • Spherical (symmetrical & asymmetrical)
  • Cylindrical
19
Q

What does a anti-friction bearing consist of

A
  • outer/inner raceway
  • rolling element
  • rolling element cage
20
Q

What are the raceways and rolling elements manufactured from

A
  • chromium steel
  • chromium nickel steel
21
Q

What materials are usually made for cages

A

-steel plate
- brass plate

22
Q

Ball bearings have very low starting resistance and are suitable for high rotational speeds (T or F)

A

T

23
Q

What are the major components of a standard ball bearing

A
  • Outer ring/race
  • Inner ring/race
  • Rolling elements (balls in this case)
  • Retainer
24
Q

Why might shields/seals be fitted to the races on a bearing

A
  • retain lubricant
  • protect bearing from contamination
25
Q

What is the difference between needle/spherical roller bearings?

A
  • Needle roller bearings have long, thin rollers (compact cross-section)
26
Q

Explain the load taking for a needle bearing

A
  • high radial load capacity
  • light axial loads
27
Q

Explain spherical roller bearings

A
  • self aligning feature
  • high radial load carrying capacity
28
Q

Which bearing is the best

A

Tapered roller bearing

29
Q

What are air bearings

A
  • utilises a thin film of pressurised air to provide 0 friction
30
Q

What are thrust bearings

A
  • support combination of radial/thrust loads
31
Q

Where are thrust bearings used

A

-engine prop shafts

32
Q

What is the main advantage of a needle roller over a cylindrical roller is

A

Very compact cross section

33
Q

Bearing can only move in one direction (T OR F)

A

T

34
Q

What is the most common use of cylindrical bearings

A
  • non locating positions

M6 Resit (10 decks)

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