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Mechanics Personal > Plain Bearings > Flashcards

Plain Bearings Flashcards

1
Q

Two types of bearings are?

A

Plain bearings and rolling element bearings.

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2
Q

What are the three types of motion in bearings?

A

Linear, rotary, axial or thrust (combined)

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3
Q

What is a bearing?

A

Supports motion and force.

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4
Q

What is a sleeve?

A

A fitting or fixture.

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5
Q

What is a bushing?

A

Takes up space.

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6
Q

Inside race is?

A

The shaft

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7
Q

Outside race is?

A

Housing bore.

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8
Q

Three things about speed?

A

Velocity, (V), RPM

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9
Q

Three things about load?

A

Pressure, (P), ft/ponds

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10
Q

Formula for bearings?

A

Pressure x Velocity (PxV)

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11
Q

plain bearings Should be interpreted as inferior to rolling element bearings? True or false?

A

False

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12
Q

Advantages of plain bearings?

A

Don’t have to make a full rotation.
Move in all directions
Shock loading

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13
Q

Metallic plain bears are made of?

A

Bronze, copper, aluminum, lead, silver Babbitt, sintered iron.

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14
Q

Advantages of metallic plain bearings are?

A

Highest load rating.
Extreme temperatures.
Cost.

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15
Q

Non metallic plain bearings are made of?

A

Plastic, carbon fiber, fiber glass, natural wood.

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16
Q

Advantages of non metallic plain bearings?

A

Shock loading.
Wide temperature range.
Cost.

17
Q

Three types of lubrications for bearings?

A

Boundary, mixed-film, full-film.

18
Q

The load carrying ability of full film bearings increases with speed. True or false?

A

True. Full film bearings offer the least amount of friction and require less energy to rotate.

19
Q

How to get from boundary to full-film?

A

Improve- shaft finish
Increase- speed
Increase - viscosity of grease
Decrease - load

20
Q

How deep should the grove be on a self lubing bearing?

A

1/4 thickness of the wall of the bearing.

21
Q

What are two types of self lubing bearings?

A

Solid lubricant liners, lubrication plugs/filled grooves.

22
Q

Advantages of self lubing plastic bearings?

A

Cost
Lightest
Maintenance free

Mechanics Personal (13 decks)

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