Rolling Element Bearings Flashcards

1
Q

What is a rolling element bearing?

A

Supports load and motion

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2
Q

Most common issues with rolling element bearings?

A

Lubrication
Contamination
Misalignment
High load/low speed

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3
Q

Ball bearings

A

Cost less then roller type
Used for light to moderate loads
Small area of contact (point contact)
High speeds
Less heat generation

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4
Q

Two types of radial ball bearings?

A

Conrad
Filling slot

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5
Q

Conrad

A

Moderate radial loads
Moderate thrust loads in each direction
More heat desperation
More speed less load

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6
Q

Filling slot

A

Higher radial loads
Light thrust loads in combination with radial loads
Filling slot must face side of thrust load

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7
Q

Double row deep grove ball bearings

A

Handles high thrust and radial loads in both directions
Same speed as single row

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8
Q

Self aligning radial ball bearings

A

Compensates for misalignment
Shock load / vibration
Low speed / low load

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9
Q

Angular contact bearings

A

Used for excessive thrust issues in horizontal thrust loading
Less radial load
Hugh thrust / moderate radial load

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10
Q

Three ways to mount angular contact bearings

A

Tandem - used when thrust is in one direction (face to back)

Back to back - more end play / thermal expansion (shoulder to shoulder)

Face to face -most common / no end play

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11
Q

Thrust ball bearings

A

Vertical thrust loads (loads running parallel to axis of Rotation)

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12
Q

Two types of thrust ball bearings

A

Flat race , flat seat ( light loads, one side rotates, 1/3 load capacity of grooved race flat seat)

Grooved race , flat seat ( most common of thrust bearings, both sides rotate, heavier loads)

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13
Q

Precision / super precision ball bearings

A

Used for exact rotation, high accuracy, limited end play, smooth running, highest speeds.

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14
Q

Disadvantages of super precision ball bearings

A

Hard to maintain
Hard to lubricate
No shock loading / vibration

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15
Q

Unground bearings

A

Fewer parts
Cost less
Reduce install costs
Radial , thrust , and combination types of loading
Light load / low speed
More radial and axial freedom

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16
Q

Bearing identification first number?

A

Type of bearing

17
Q

Bearing identification second number?

A

Load rating

18
Q

Bearing identification last two numbers

A

Multiply by 5, inside bore in Millimeters