7.11

Question 1

What will happen if a bearing is overpacked

Answer 1

It will overheat

Question 2

Hydrodynamic lubrication

Answer 2

The load carrying surfaces of the bearing are separated by a thick film of lubricant.

Question 3

Hydrostatic lubrication

Answer 3

Air and oil
Air is forced into the bearing area at a high pressure to separate the surfaces.

Question 4

Boundry layer

Answer 4

Oil film between the mating parts is only a few molecules thick
Viscosity is not important.
Instead , the lubricity is important

Question 5

Solid film lube

Answer 5

Paint like coating of very fine particles of lube pigments, blended with a binder and other additives.

Question 6

True brinelling

Answer 6

Caused by excessive impact.
Appears as indentations in bearing cup raceways.
Can lead to vibration and premature bearing failure.

Question 7

False brinelling

Answer 7

Caused by vibration of the bearing while in a static state.
Lubricant can be forced out.
Metal-metal wear +vibration creates corrosion which looks like true brinelling.