Machinery's Handbook, 31st Edition
Ball and Roller Bearings 2487 where f c = a factor which depends on the geometry of the bearing components, the accu racy to which the various bearing parts are made, and the material. Values of f c are given in Table 29 Z = number of balls per row in a single row, single direction thrust ball bearing D = ball diameter, mm (inches) α = nominal contact angle, degrees Table 29. Values of f c for Thrust Ball Bearings d D m α = 90 ° D cos α α = 45 ° α = 60 ° α = 75 ° Metric a Inch b Metric a Inch b Metric a Inch b Metric a Inch b 0.01 36.7 2790 0.01 42.1 3200 39.2 2970 37.3 2840 0.02 45.2 3430 0.02 51.7 3930 48.1 3650 45.9 3490 0.03 51.1 3880 0.03 58.2 4430 54.2 4120 51.7 3930 0.04 55.7 4230 0.04 63.3 4810 58.9 4470 56.1 4260 0.05 59.5 4520 0.05 67.3 5110 62.6 4760 59.7 4540 0.06 62.9 4780 0.06 70.7 5360 65.8 4990 62.7 4760 0.07 65.8 5000 0.07 73.5 5580 68.4 5190 65.2 4950 0.08 68.5 5210 0.08 75.9 5770 70.7 5360 67.3 5120 0.09 71.0 5390 0.09 78.0 5920 72.6 5510 69.2 5250 0.10 73.3 5570 0.10 79.7 6050 74.2 5630 70.7 5370 0.12 77.4 5880 0.12 82.3 6260 76.6 5830 … … 0.14 81.1 6160 0.14 84.1 6390 78.3 5950 … … 0.16 84.4 6410 0.16 85.1 6470 79.2 6020 … … 0.18 87.4 6640 0.18 85.5 6500 79.6 6050 … … 0.20 90.2 6854 0.20 85.4 6490 79.5 6040 … … 0.22 92.8 7060 0.22 84.9 6450 … … … … 0.24 95.3 7240 0.24 84.0 6380 … … … … 0.26 97.6 7410 0.26 82.8 6290 … … … … 0.28 99.8 7600 0.28 81.3 6180 … … … … 0.30 101.9 7750 0.30 79.6 6040 … … … … 0.32 103.9 7900 … … … … … … … 0.34 105.8 8050 … … … … … … … a Use to obtain C a in newtons when D is given in mm. b Use to obtain C a in pounds when D is given in inches. For thrust ball bearings with two or more rows of similar balls carrying loads in the same direction, the basic load rating, C a , in newtons (pounds) is found by the formula: (10) where Z 1 , Z 2 , . . . , Z n = number of balls in respective rows of a single-direction multi-row thrust ball bearing C a 1 , C a 2 , . . . , C an = basic load rating per row of a single-direction, multi-row thrust ball bearing, each calculated as a single-row bearing with Z 1 , Z 2 , . . . , Z n balls, respectively The magnitude of the equivalent thrust load, P a , in newtons (pounds) for thrust ball bearings with α ≠ 90 degrees under combined constant thrust and constant radial loads is found by the formula: (11) where F r = the applied radial load in newtons (pounds) F a = the applied axial load in newtons (pounds) P XF YF a r a = + C a Z 1 Z 2 … Z + n + + ( ) Z 1 C a 1 ----- 10 3 ⁄ Z 2 C a 2 ----- 10 3 ⁄ … + + Z n C an ----- 10 3 ⁄ + –0.3 = [ ]
X = radial load factor as given in Table 30 Y = axial load factor as given in Table 30
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