Bearings (1)

Question 1

Bearings

Answer 1

Accommodate and support both motion and force.

Question 2

3 types of motion

Answer 2

Rotary, linear, and combined

Question 3

Radial loads

Answer 3

Act at right angles to the shaft or axis of rotation

Question 4

Thrust loads

Answer 4

Act parallel to the axis of rotation

Question 5

2 major factors of bearings

Answer 5

Speed (v) and load (p)

Question 6

Inside race?

Answer 6

Shaft bore

Question 7

Outside race?

Answer 7

Housing bore

Question 8

2 types of bearings?

Answer 8

Plain and rolling element

Question 9

Plain bearing

Answer 9

Allows any direction of rotation

Question 10

Oscillating shaft

Answer 10

Good when a shaft doesn’t make a full rotation

Question 11

Metallic plain bearings are made from?

Answer 11

Bronze, copper, aluminum, lead, and silver

Question 12

Metallic plain bearing advantages

Answer 12

Higher load capacity, wide temp range, structural integrity, and cost to perform ratio

Question 13

Nonmetallic plain bearing advantages?

Answer 13

Handling shock and vibration, wide temp range, structural integrity, and cost to perform ratio

Question 14

Hydrostatic lubrication

Answer 14

External pump supplies pressure. Full film for no metal to metal contact

Question 15

Boundary lubrication

Answer 15

Bearing and shaft rub together with thin film

Question 16

Mixed film lubrication

Answer 16

Part of load is supported by film and the rest by hydrodynamic pressure

Question 17

Full film

Answer 17

Thick continuous film

Question 18

Boundary and mixed film upgraded by?

Answer 18

Increase speed, increase viscosity, decrease load, and improve finish

Question 19

How thick are bearing grooves

Answer 19

One quarter of the wall thickness

Question 20

2 types of plain bearings

Answer 20

Metallic and nonmetallic