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M6 > Bearings > Flashcards

Bearings Flashcards

1
Q

Plain bearing

A

Designed for light loads and continuous motion

Frequent maintenance

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2
Q

What do bearing do

A

Stop contamination

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3
Q

What are support journals of shelf and axis

A

Journal bearings

Roller bearings

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4
Q

Pivot journeys

A

Pivot bearing

Axial bearing

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5
Q

What are pivot journals

A

Accept force in a longitudinal direction

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6
Q

What are supporting journal

A

Accept forces at right angles to the drilling axis

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7
Q

Sliding bearing

A

operates in a bearing box, a bearing bushing
or directly in the bearing body.
Bearings for large journal diameters and bearings that cannot be pushed over the shafts during assembly (e.g. crankshafts) must be two-part bearings

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8
Q

What is bearing play

A

Dependent on the lube and demands of the bearing

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9
Q

What are slowing bearing resistant to

A

Push forces , operate with little force

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10
Q

What are disvantsge of sliding bearings

A

High starting resistance

Continues maintenance

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11
Q

What are sliding bearing suitable for

A

Fast and slow rotational speed

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12
Q

What are the bearing loads

A

Radial and thrust

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13
Q

What are the 5 types of anti friction bearings

A
  • Tapered
  • Needle
  • Ball
  • Spherical
  • Cylindrical
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14
Q

What does an anti friction bearing consist of

A

the outer and inner raceway, the rolling element and usually a rolling element cage.

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15
Q

Ball bearings

A 
Only take light radial loads 
Popular 
Fail under thrust load 
Very slow starting resistance due to all point contact 
Has a deep grove
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16
Q

Cylindrical roller bearing

A 
Light Axiel or thrust 
More radials 
Thermal expansion 
Line contact 
Heavy cage with fewer rollers leads to lower load capacity
17
Q

Nedle roller bearings

A

Long radial load
High radial load
Very light axial load

18
Q

Spherical roller

A

Self aligning for minor angular displacement
Very height radial load capacity
Robust cage

19
Q

Tapered roller bearings

A 
Can take combined radial and thrust load 
Longer life reduced size 
Low friction coefficient 
High speeds 
Less sensitive to contamination
20
Q

Materials of ball bearings

A

Copper tin alloys
Copper tin zinc casting alloys
Lead tin alloys
Cast iron

21
Q

What is a dry powder material

A

Contain lubrications in pores which escapes when heated

22
Q

Radial bearings

A

can accept forces that act radially to the shaft axis. Axial bearings or longitudinal bearings accept forces that act in the direction of the axis of the shaft.

23
Q

Axial bearings

A

Accepts forces acting in the shaft direction

24
Q

Air bearings

A

Thin film of pressurised air
Zero friction load bearing
Avoid traditional bearing problems
Air cycle machine

M6 (13 decks)

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