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Mechanics Personal > Roller Bearings > Flashcards

Roller Bearings Flashcards

1
Q

What kind of contact do roller bearings have?

A

Line contact

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2
Q

Roller bearings have an advantage of what to ball bearings?

A

Highest radial loads.
High shock loads.

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3
Q

What are the four types of roller bearings?

A

Cylindrical
Needle
Spherical
Tapered

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4
Q

Advantage to cylindrical bearings?

A

Highest combined radial load and speed capacity.

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5
Q

Disadvantage to Line contact?

A

Generates more heat.

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6
Q

Cylindrical bearings have to have what to accommodate thrust?

A

Shoulders. But limited to how much heat can be disapated

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7
Q

What is speed limited by in cylindrical bearings?

A

Roller length to diameter ratio.
Grade of precision.
Type of lubrication. (Oil)
Shaft installation / alignment
Type of housing
Heat dissipation capability

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8
Q

What ratio makes it a needle bearing?

A

6:1

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9
Q

What is the perfect ratio for a bearing?

A

1:1

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10
Q

Two ways to mount roller bearings?

A

Fixed
Floating

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11
Q

What makes a fixed bearing fixed?

A

Fixing ring

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12
Q

Disadvantage of roller bearings?

A

Misalignment.

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13
Q

Advantage of needle bearings?

A

Can have very heavy radial loads I’m a minimal amount of space

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14
Q

What are the two types of needle bearings?

A

Cage separated
(Exact rotation, high speeds)
Full complement
(Drawn cup , grease contained)

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15
Q

Disadvantage of grease contained, drawn cup?

A

Rollers fall out when shaft is removed.

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16
Q

What kind of bearings are in cam-type bearings?

A

Plain or rolling doesn’t matter.

17
Q

Advantage to spherical bearings?

A

Accommodates misalignment

High radial or combined radial and thrust load.

18
Q

What degree do spherical roller bearings be with no effect?

A

.5 - 2

19
Q

Advantage of tapered bearings?

A

High thrust loading

20
Q

Where does shoulder face on tapered bearings?

A

Faces thrust
Can only take thrust in one direction.

21
Q

Inner race of tapered bearings?

A

Cone

22
Q

Outer race of tapered bearings?

A

Cup

Mechanics Personal (13 decks)

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