Bearings (1)

Question 1

2 main categories of bearings

Answer 1

Plain and element bearings

Question 2

A bearing accommodates and supports

Answer 2

Motion and force

Question 3

Radial load

Answer 3

Load acts in a right angle to the shaft

Question 4

Axial load

Answer 4

Load that acts parallel to the axis of rotation.

Question 5

2 most important factors in bearing choice

Answer 5

Speed (v-velocity) and load (p-pressure)

Question 6

A bearing with no rolling element is-

Answer 6

A plain bearing

Question 7

Inside race is-

Answer 7

Shaft bore

Question 8

Outside race is

Answer 8

Housing bore

Question 9

What direction of rotation is acceptable for a plain bearing.

Answer 9

Radial, linear, axial, and oscillating.

Question 10

A plain bearing is your best choice if the movement is-

Answer 10

Oscillating (moves back and forth, doesn’t make a full rotation)

Question 11

What are the two main categories on plain bearings-

Answer 11

Metallic or non metallic.

Question 12

What are some metals metallic plain bearings are made of.

Answer 12

Bronze, copper, aluminum, lead, and silver

Question 13

What do non metallic plain bearings excel?

Answer 13

Wide temperature range, structural integrity, cost to performance ratio, shock and vibration.

Question 14

What do metallic plain bearings excel at?

Answer 14

High load capacity, wide temperature range, structural integrity, and cost to performance ratio.

Question 15

What are the three things that determine viscosity?

Answer 15

How it pours, stirs, and handles pressure.

Question 16

Depth of lubrication groove is?

Answer 16

A QUARTER OF THE WALL THICKNESS.

Question 17

Boundary lubrication-

Answer 17

Bearing and shaft rub, only a thin film. (Least desirable)

Question 18

Mixed film-

Answer 18

Less metal to metal contact than boundary but still slight metal to metal contact.

Question 19

Full film or hydrodynamic lubrication-

Answer 19

Thick continuous film, no metal to metal contact.

Question 20

How would you change boundary lubrication to mixed film or full film/hydrodynamic?

Answer 20

Increase shaft speed, increase viscosity of lubricant, decrease load, improve shaft finish.

Question 21

What are the two types of self lubrications in plain bearings?

Answer 21

Lubrication plugs (holes in housing)
Solid lubricated (liners are centered when casted)

centered- powdered when casted to create small voids

Question 22

Extreme service environment bearings can withstand what temperatures?

Answer 22

-200F — 900F

Question 23

What are the 3 types of motion

Answer 23

Rotary, linear, and combined