Machinery's Handbook, 31st Edition
2424
Thrust Bearings
Oil Groove
2
Chamfer
1
3
10
4
9
5
8
6
7
Fig. 5. Flat Plate Thrust Bearing Example Design.* Step Thrust Bearing Design.— The following steps define the performance of a step thrust bearing, one section of which is shown in Fig. 6. b b 2 b 1 e h
U Fig. 6. Basic Elements of Step Thrust Bearing.*
Although each bearing section is wedge shaped, as shown at the right in Fig. 6, for the purposes of design calculation it is considered to be a rectangle with a length b equal to the circumferential length along the pitch line of the section being considered, and a width a equal to the difference in the external and internal radii. General Parameters: For optimum proportions, a = b , b 2 = 1.2 b 1 , and e = 0.7 h . 1) Internal diameter, D 1 . An internal diameter is assumed that is sufficient to clear the shaft. 2) External diameter, D 2 . A unit bearing pressure is assumed from Table 1 and the exter nal diameter is then found from the formula D K p W D 4 g 2 1 2 π = + 3) Radial pad width, a. Equal to the difference between the external and internal radii. a D D 2 2 1 = − * See footnote on page 2418
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