Machinery's Handbook, 31st Edition
2410
Journal Bearings
0.011
0.010
Above 600 rpm Below 600 rpm
0.009
0.008
Range
0.007
0.006
0.005
Range
0.004
0.003
0.002
0.001
0
1
2
3
4
5
6
7
8
Fig. 6. Operating Diametral Clearance C d versus Journal Diameter d . Table 4. Representative l / d Ratios Type of Service l / d Type of Service
l / d
Gasoline and diesel engine
Light shafting
2.5 to 3.5 2.0 to 3.0 1.5 to 2.5 1.0 to 1.3
main bearings and crankpins
0.3 to 1.0 Heavy shafting 1.2 to 2.5 Steam engine
Generators and motors Turbogenerators
0.8 to 1.5 2.0 to 3.0
Main bearings
Machine tools
Crank and wrist pins
. ZN m p 69 1000 b 2 ^ h
′ =
P
where N = rpm 10) Eccentricity ratio ε : Using P ′ and l / d , the value of 1/(1 − ε ) is determined from Fig. 7 and from this, ε can be determined.
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