Bearings1

Question 1

Bearings 2 main categories

Answer 1

Plain bearings and rolling element bearings

Question 2

Three types of motion

Answer 2

Rotary, linear and combined

Question 3

What is a radial load?

Answer 3

Radial loads act as right angles to the shaft or axis of rotation

Question 4

What is a thrust load?

Answer 4

Applied or act parallel to the axis of rotation

Question 5

Speed is the same as?

Answer 5

V velocity

Question 6

Load is the same as?

Answer 6

P pressure

Question 7

What’s an important role in the selection of a bearing?

Answer 7

Environmental or ambient conditions

Question 8

What are plain bearings designed for?

Answer 8

Support shafts that are fixed on a particular plane.

Question 9

What is the inside race?

Answer 9

Shaft bore

Question 10

What is the outside race?

Answer 10

Housing bore

Question 11

What are the 4 types of motions?

Answer 11

Radial, linear, axial or oscillating

Question 12

2 bearing material categories

Answer 12

Metallic and non-metallic

Question 13

Metallic bearings material

Answer 13

Bronze, copper, aluminum alloys, lead and silver Babbitt. Sintered iron and copper powders

Question 14

Metallic bearings advantages

Answer 14

1. Higher load capacity
2. Wide Temp range
   3.structal integrity
3. Cost-to-performance ratio

Question 15

Non-metallic bearing advantages

Answer 15

1. Shock and vibration
2. Wide Temp range
3. Structural integrity
   4.cost-to-performance ratio

Question 16

Plain bearings lube categories

Answer 16

Required lubrication
Self-lubricating

Question 17

Plain bearing alloys

Answer 17

Tin-base Babbitt
Lead-base Babbitt
Three component bearings, Babbitt surface
Cadmium based
Copper-lead
Lead bronze
Tin bronze
Aluminum alloy
Silver(overplated)

Question 18

Boundary bearings

Answer 18

Bearing and shaft rub together with only a thin film of lube. Grease lubricated bearings

Question 19

Mixed film

Answer 19

Part of load is supported on a boundary film while the remaining part is supported by hydro-dynamic pressure

Question 20

Full film or hydrodynamic

Answer 20

Thick continuous film of self pressurized lubricant separates shaft from bearing. No metal to metal contact

Question 21

Full film or hydrodynamic

Answer 21

Thick continuous film of self pressurized lubricant separates shaft from bearing. No metal to metal contact

Question 22

Hydrostatic

Answer 22

External pumps supply pressure to the lubricant. Full film to prevent metal to metal contact

Question 23

Self-lubricating bearings

Answer 23

Has a lubricant of some nature as an inherent or component part of the bearing structure

Question 24

Solid lube liners

Answer 24

Cylindrical metallic or woven fiber body to provide rigitidy and structural strength

Question 25

Lubrication plugs and filled grooves

Answer 25

Bronze materials made from variety of alloys with holes drilled through the walls of bearing. Holes are filled with lube material made of carbon graphite/ teflon

Question 26

Plastic bearings

Answer 26

Light weight and cost-effective

Question 27

Oscillating shaft

Answer 27

120° motion. Not a 360° rotation rolling element bearings not used

Question 28

Low temperature bearings

Answer 28

-200°F

Question 29

High temperature bearings

Answer 29

+900°F

Question 30

Sintered iron

Answer 30

Bearings made from powdered materials

Question 31

Maintain structural integrity

Answer 31

1/4 of the thickness of bearing material

Question 32

P×V

Answer 32

Pressure × Velocity

Question 33

4 ways to help bearings performance

Answer 33

Shaft finish- improve Change viscosity-increase Reduce load- decrease Change speed- decrease