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.

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

56

Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64
Produced with Yudu - www.yudu.com