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Specific load capacity C10
Definition
The specific loading capacity C10 is the radial load capacity of a 10 mm long ball zone of a MarMotion rotary stroke bearing, taking into account the nominal diameter dw, the preload v and cage type N 500, N 501, N 511 or N 502.
The specific radial force P10 is to be determined based on the load on the rotary stroke bearing.
The following must always apply: P10 ≤ C10
C10 is dependent on: Nominal diameter dw, ball diameter k and the number of balls, preload v and the surface pressure criteria at the points of contact between the rolling elements and the surfaces of the guide shaft and guide bush (Hertzian stress), as well as the elastic deflection of the shaft axis from the centered position, are calculated using the value R10 suspension of a 10 mm long ball zone.
The specific load ratings C10 of Mahr ball cages N 500 and N 501 in the table Specific load rating C10 and suspension R10 were determined while maintaining the claim of the MarMotion rotary stroke bearing.
The elastic deflection with a load P10 = C10 should not be higher than half the value of the preload v.<br/> δR,max = 0.5 v [µm]
Values C10 and R10 in the table are specified as a function of the preload v so that this condition is met. The suspension R10 [µm/N] is the deflection of the axis of a 10 mm long ball zone with a radial load of 1 N applied.
The deflection of a 10 mm long ball zone is calculated from: A10 = P10 · R10 [µm]
Calculation method I
After determining the specific radial force P10, the required nominal diameter dw is taken from one of the tables, for which an equally high or higher value C10 applies.
Calculation method II
Due to the given nominal diameter dw, C10 is taken from one of the tables and used as the permissible specific radial force P10 for the subsequent calculation.<br/> Note: The calculation formula for P10 can no longer be used when contact path e <60 mm (section Radial load as pure torque) as moment factor g is not accurate enough due to the empirical determination.
Ball cage type N 501:<br/> Specific load rating C10 and deflection R10<br/> The values C10 and R10 are specified for the permissible preloads.
Ball cage type N 500:<br/> Specific load rating C10 and deflection R10<br/> The values C10 and R10 are specified for the permissible preloads.
| Preload v [μm] | ||||||||
|---|---|---|---|---|---|---|---|---|
| Parameter dw [mm] | C10 [N] R10 [μm/N] | 5 | 6 | 7 | 8 | 9 | 10 | 12 |
| 18 - 20 | C10 R10 | 188 0.014 | 248 0.013 | 312 0.012 | 382 0.011 | |||
| 24 - 25 | C10 R10 | – – | 300 0.01 | 370 0.009 | 460 0.009 | 550 0.009 | ||
| 30 - 32 | C10 R10 | – – | – – | 380 0.01 | 470 0.009 | 560 0.009 | 660 0.008 | |
| 38 - 42 | C10 R10 | – – | – – | 443 0.009 | 540 0.008 | 645 0.008 | 750 0.007 | 1000 0.007 |
The values C10 and R10 are specified for the permissible preloads.
| Preload v [μm] | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Parameter dw [mm] | C10 [N] R10 [μm/N] | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 12 | 14 | 16 | 18 | 20 |
| 4 | C10 R10 | 12 0.0075 | 25 0.055 | 42 0.042 | ||||||||||||
| 6 | C10 R10 | – – | 25 0.042 | 45 0.035 | 70 0.030 | |||||||||||
| 8 | C10 R10 | – – | – – | 50 0.033 | 75 0.03 | 101 0.027 | ||||||||||
| 10 | C10 R10 | – – | – – | – – | 78 0.027 | 110 0.025 | 144 0.023 | |||||||||
| 12 | C10 R10 | – – | – – | – – | 92 0.023 | 130 0.021 | 170 0.019 | |||||||||
| 14-16 | C10 R10 | – – | – – | – – | – – | 141 0.02 | 185 0.018 | 233 0.017 | 285 0.015 | |||||||
| 18-20 | C10 R10 | – – | – – | – – | – – | 163 0.017 | 215 0.015 | 270 0.014 | 331 0.013 | |||||||
| 24-25 | C10 R10 | – – | – – | – – | – – | – – | 276 0.012 | 350 0.011 | 424 0.011 | 500 0.01 | ||||||
| 30-32 | C10 R10 | – – | – – | – – | – – | – – | – – | 380 0.01 | 462 0.01 | 560 0.009 | 650 0.009 | |||||
| 40-42 | C10 R10 | – – | – – | – – | – – | – – | – – | 410 0.009 | 495 0.009 | 590 0.009 | 690 0.008 | 910 0.007 | ||||
| 50-52 | C10 R10 | – – | – – | – – | – – | – – | – – | – – | 552 0.008 | 658 0.008 | 770 0.007 | 1030 0.006 | ||||
| 63 | C10 R10 | – – | – – | – – | – – | – – | – – | – – | – – | 670 0.008 | 780 0.007 | 1050 0.006 | 1370 0.006 | |||
| 80 | C10 R10 | – – | – – | – – | – – | – – | – – | – – | – – | – – | 846 0.007 | 1110 0.006 | 1430 0.006 | 1720 0.005 | ||
| 100 | C10 R10 | – – | – – | – – | – – | – – | – – | – – | – – | – – | – – | 1230 0.005 | 1560 0.005 | 1880 0.005 | 2280 0.004 | 2660 0.004 |
The values C10 and R10 are specified for the permissible preloads.
