Plain

Question 0

What 2 types of load do plain support

Answer 0

Thrust

Journal

Question 1

What is the difference between plain & anti friction bearings

Answer 1

Plain have no rolling elements

Question 2

There are 3 types of radial load what are they

Answer 2

Stationary
Oscillating
Reciprocating

Question 3

What is an oscillating load

Answer 3

The load shifts through an arc less than 180*

Question 4

What is a stationary load

Answer 4

The load acts in one direction only

Question 5

What is a reciprocating load

Answer 5

The load shifts 180*

Question 6

What is the difference between a bushing and a bearing

Answer 6

Bearing is split bushing is not

Question 7

Name 2 types of pre-lubricated bearings

Answer 7

Porous bronze
Bronze matrix ( dry )

Question 8

What 2 things are needed to maintain full film in hydrodynamic bearings

Answer 8

Minimum speed

Viscosity of lube

Question 9

In a hydrodynamic bearing where is the oil inlet

Answer 9

In the unloaded area

Question 10

In hydrodynamic what is oil whirl

Answer 10

An unsteady load at speed can cause oil whirl ( a wave like motion)

Question 11

To stabilize oil whirl which 2 types of bearing can be used

Answer 11

Tilting pad

Lobed

Question 12

When is a hydrostatic bearing needed

Answer 12

When a heavy unsteady load must be carried

Where speed is too low for hydrodynamic

Question 13

Hydrostatic bearings depend on what for lubrication

Answer 13

Pressurized oil

Question 14

What are some of the limitations of pre-lubed bushings

Answer 14

Poor heat distribution
No lube circulation
Not suitable for start/stop
Not suitable for high temp

Question 15

Can you name 2 types of bushing

Answer 15

Wrapped
Solid
Floating
Water lubricated

Question 16

What is the porosity of a porous bronze bushing

Answer 16

3-30%

Question 17

On hydrostatic bearings what controls oil pressure

Answer 17

Restrictors are threaded in with different size orifices to control pressure

Question 18

On an oil lift bearing what is the term used for the oil

Answer 18

Jacking oil

Question 19

Hybrid bearings require 2 types of lube to operate

Answer 19

Hydrodynamic

Hydrostatic

Question 20

What is the function of a thrust bearing

Answer 20

To hold a shaft axial lay

Question 21

What are 3 types of thrust bearing

Answer 21

Flat plate
Tapered land
Tilting pad

Question 22

What is fatigue resistance

Answer 22

Ability to resist cracking and flaking

Question 23

What is embeddability

Answer 23

How a material will handle contaminants without failure

Question 24

What is deform ability

Answer 24

Allows material to yield to misalignment or imperfections

Question 25

What is compressive strength

Answer 25

Strong enough to support a the load at max op temp

Question 26

Define false loading

Answer 26

When a split bearing is installed if a chip or burr is under it the load will be taken by that high spot

Question 27

Define crush

Answer 27

This is the distance the new insert sits above the split line. When bolted down the shell is crushed providing more surface area thus giving better heat distribution

Question 28

Define spread

Answer 28

When the insert is wider than the housing, when installed it is pushed down and the spring of it being too wide helps hold it in position