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Engineering Section<br />
a 3<br />
—Lubrication Factor<br />
a 3<br />
—Lubrication Factor Approximation<br />
Lubricant Parameter<br />
1000<br />
100<br />
10<br />
40 S.A.E.<br />
30 S.A.E.<br />
20 S.A.E.<br />
10 S.A.E.<br />
GEAR<br />
S.A.E. 50<br />
Figure 10 Figure 11<br />
LUBE 80W-140<br />
AUTOMATIC TRANSMMISSION FLUID<br />
Specific Film Thickness <br />
6<br />
5<br />
4<br />
3<br />
2<br />
1<br />
<strong>Cylindrical</strong> Bearing Film Thickness Chart<br />
5,000 RPM<br />
2,000 RPM<br />
100 200 300 400 500<br />
1,000 RPM<br />
600 700 800 900<br />
Lubricant Parameter x Pitch Diameter*<br />
500 RPM<br />
100 RPM<br />
Figure 12<br />
3.5<br />
3.0<br />
1 20<br />
68<br />
40<br />
104<br />
60<br />
140<br />
80<br />
176<br />
100<br />
212<br />
Temperature<br />
Figure 13<br />
120<br />
248<br />
140<br />
284<br />
160 (C)<br />
320 (F)<br />
Specific Film Thickness <br />
6<br />
5<br />
4<br />
3<br />
2<br />
1<br />
5,000 RPM<br />
<strong>Tapered</strong> Bearing Film Thickness Chart<br />
2,000 RPM<br />
1,000 RPM<br />
500 RPM<br />
100 RPM<br />
Lubrication Factor (a 3<br />
)<br />
2.5<br />
2.0<br />
1.5<br />
1.0<br />
0<br />
.6 .7 .8 .9 1.0 1.2 1.4 1.6 1.8 2 3 4 5 6 7 8 9 10<br />
100 200 300 400 500<br />
Lubricant Parameter x Pitch Diameter*<br />
INSTRUCTIONS<br />
600 700 800 900<br />
1. Determine Lubricant Parameter according to<br />
temperature <strong>and</strong> type of Lubricant from Figure 10.<br />
2. Multiply Lubricant Parameter by Bearing Pitch<br />
Diameter*.<br />
3. Determine Specific Film Thickness “” from<br />
Figure 11 or 12.<br />
4. Determine Lubrication Factor “a 3<br />
” from Figure 13.<br />
E.H.D Specific Film Thickness, <br />
Bore Diameter Outside Diameter<br />
*Pitch Diameter (in.) = =<br />
2<br />
17
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