Technical Calculating System Life
With LF determined for either a 4 bearing carriage 54 or for a ring system 55, the life in km can be calculated using one of the two equations below.
In these equations, the Basic Life is taken from the table on the right in respect of the bearings and the lubrication condition applicable.
For dry systems use equation [3]: [3] System life (km) = For lubricated systems use equation [4]: [4] System life (km) = BL (0.03 + 0.97LF)³
Example load-life calculations for PRT2 systems are available online. Please visit
www.bwc.com/products/prt.html.
BL (0.03 + 0.97LF)²
Bearings Basic Life Dry
...J13...
SS...J13... ...J18...
SS...J18... ...J18DR...
40 30 50 35 50
SS...J18DR... 35 ...J25...
SS...J25... ...J25DR...
70 40 70
SS...J25DR... 40 ...J34...
SS...J34...
100 60
...J34DR... 100 SS...J34DR... 60 ...J54...
150
SS...J54... 100 ...J54DR... 150 SS...J54DR... 100
Basic Life Lubricated
40 30 60 45 60 45 40 25 45 35 70 50
160 120 150 110 280 220
The above data assumes that steel bearings run on steel rings, and that stainless steel bearings run on stainless steel rings.
Industry Standard Bearing Load Capacities
The load capacities and calculations in the previous sections have been carefully developed, and are based on rigorous testing and years of application experience.
Many competitive systems use industry standard, theoretically derived figures for bearing static and dynamic load capacities, which are generally higher than the true working load capacities which Bishop-Wisecarver uses.
The table below shows the industry standard static (C0R & C0A) and dynamic (CR & CA) load figures for PRT2 bearings(R & A subscripts indicate radial & axial loading).
those from other manufacturers.
For each of two Twin Bearings
It is NOT recommended that they are used for determining system life.
Bearing Dynamic & Static Load Capacities (N)
CR CA C0R C0A ...J13... 695 194 265 74 For
Double Row Bearings
-
Bearing Dynamic & Static Load Capacities (N)
CR -
CA -
C0R C0A -
- ...J18... 1438 419 593 173 ...J18DR... 2301 857 1168 435 For
Floating Bearings
- -
Dynamic & Static Load Capacities (N)
CR - -
C0R - -
...J25... 3237 791 1333 326 ...J25DR... 5214 1618 2646 821 ...FJ25... 4900 6100 ...J34... 5291 1270 2600 557 ...J34DR... 9293 2523 5018 1362 ...FJ34... 11500 12500 ...J54... 13595 2320 6657 1136 ...J54DR... 21373 4601 12899 2777 ...FJ54... 21500 28900
The above load capacities apply to standard steel bearings. Stainless steel bearings may be different. These are included principally to allow the comparison of Hepco components with
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