COMPACT RAIL (pdf; EN) - Rollon

5 Technical instructionsService lifeThe dynamic load capacity C is a conventional variable used for calculatingthe service life. This load corresponds to a nominal service life of 100 km.For values of the individual slider see pg. 12ff Load capacities. The followingformula (see fig. 91) links the calculated theoretical service life to thedynamic load capacity and the equivalent load:L km= theoretical service life ( km )C = dynamic load capacity ( N )C fL Km= 100 · ( ––– · ––– cP = effective equivalent load ( N )· f h) 3P f i= contact factorf cf if h= application coefficient= stroke factorFig. 91The equivalent load P corresponds in its effects to the sum of the forcesand moments working simultaneously on a slider. If these different loadcomponents are known, P results as follows:P aM 1M 2MP = P 3r+ ( + + + + y ) · CC 0axM xM yM0radzFig. 92Here the external loads are assumed as constant in time. Brief loads,which do not exceed the maximum load capacities, do not have any relevanteffect on the service life and can therefore be neglected.The contact factor f crefers to applications in which several sliders passthe same rail section. If two or more sliders move over the same point ofa rail, the contact factor according to table 34 to be taken into account inthe formula for calculation of the service life.Number of sliders 1 2 3 4f c1 0.8 0.7 0.63Tab. 3456 www.rollon.com