12_ch 12 Mechanical Design budynas_SM_ch12

12_ch 12 Mechanical Design budynas_SM_ch12 -...

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Chapter 12 315 12-13 Given: d = 1 . 250 in, t d = 0 . 001in, b = 1 . 252 in, t b = 0 . 003in, l = 1 . 25 in, W = 250 lbf, N = 1750 rev/min, SAE 10 lubricant, sump temperature T s = 120°F . Below is a partial tabular summary for comparison purposes. c min cc max 0.001 in 0.002 in 0.003 in T f 132.2 125.8 124.0 ± T 24.3 11.5 7.96 T max 144.3 131.5 128.0 µ ± 2.587 3.014 3.150 S 0.184 0.053 7 0.024 9 ² 0.499 0.775 0 0.873 fr c 4.317 1.881 1.243 Q rcN j l 4.129 4.572 4.691 Q s Q 0.582 0.824 0.903 h o c 0.501 0.225 0.127 f 0.006 9 0.006 0.005 9 Q 0.094 1 0.208 0.321 Q s 0.054 8 0.172 0.290 h o 0.000 501 0.000 495 0.000 382 Note the variations on each line. There is not a bearing, but an ensemble of many bear- ings, due to the random assembly of toleranced bushings and journals. Fortunately the distribution is bounded; the extreme cases, c min and c max , coupled with c provide the charactistic description for the designer. All assemblies must be satisfactory. The designer does not specify a journal-bushing bearing, but an ensemble of bearings.
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This note was uploaded on 12/13/2011 for the course EML 3013 taught by Professor Shingley during the Fall '11 term at UNF.

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