1. Outline Hydrodynamic/Journal/Sleeve Bearings Rolling-Element Bearings
types
selection of roller bearings

2. all bearings are of course only necessary evils,
contributing nothing to the product or function of the machine; and any virtues they can have are only of a negative order. Their merits consist in absorbing as little power as possible, wearing out as slowly as possible, occupying as little space as possible, and costing as little as possible
(Michell, 1929)

3. Comparing Rolling to Journal
Rolling Bearing are better because:
low starting and good operating friction
radial and thrust loads
no self-excited instabilities
less space axially
can seal lubricant in bearing
Journal Bearings are better because:
fatigue failure not a problem
less space radially
less noise
more tolerant to misalignment
less expensive, except for oiling system
less operating friction
deep groove ball
full journal
pg. 654 in Norton

4.                                                                                    
Reprinted From: "Design Data" Teague & Dunn, Machine Elements See

5. Rolling Element Bearings

6. Ball Bearings
good for smaller sizes, lighter loads

7. Roller Bearings good for larger sizes, heavier loads
handle shock and impact loading well
Spherical
Plain
Tapered

8. Rolling Element Comparisons
Figure 10-21, Pg. 658 in Norton
Rolling Element Comparisons

9. Rolling Element Analysis
Load Rating
Calculate P
lookup C, C0 in table
calculate for a specific number of cycles
Rating Life, L10
life at which 10% of bearings have failed
in millions of revolutions or in hours
Equivalent load for combined conditions
needed when axial and thrust loads are present
Variable loading

12. Bearing Selection, P 10-26,27
Get tangential load on Gear 2 from equal & opposite torques
Get radial loads using radial load factor
Get bearing reactions in x-dir from gear loads in x-z plane only
Get bearing reactions in y-dir from gear loads in y-z plane only
Get total vector load at each bearing (sqrt of sum of squares)
Calculate needed minimum C, use Fig 10-23