Slide bearings - Wolf Kunststoff-Gleitlager GmbH

CC CC CCMathematical example13.5.4.2 Checking the condition [13]We check the condition taken from formula (13) (page 32) by means of the calculated figures.PrefacetL < tLmax⇒ 15s < 6000swith:t Lt LmaxIndex: transit time taken from the data of stress = 15 s for one stroke: maximum permissible transit time taken from ill. 22; with kpv = 0,825 (see above)reveals t Lmax= 6000 s.As this condition is fulfilled the correction factor f can be applied as follows.ContentsMaterialoverview13.5.4.3 Calculation of the switch-on duration ED by means of formula (16):ΣtL 15sED =• 100=( Σt+ Σt)15s + 300sLP[%] ⇒• 100% 4,76%with:t L: transit time -taken from 13.2- = 15st P: interval -taken from 13.2- = 300sDesignguidelinesMathematicalexample13.5.4.4. Calculation of the correction factor f by means of formula (15):2f = 0,02 − (0,00 01 ⋅ED) ⇒ 0,02 − (0,0001 ⋅ 4,76 ²) =0,092with:ED : taken from 13.5.4.3 = 4,76%Hence follows from formula (12) the emerging pv-value pv EDon a switch-on duration of 4,76 %:N mNpvED= p • v • f ⇒ 66 ,66 • 0,5 • 0,092 = 3,072mm ² minmmwith:p : taken from 13.5.1. = 66, 66 N/mm²v : taken from 13.5.2. = 0,5 m/minf : taken from 13.5.4.4. = 0,092m•minTribologyConditions ofinstallationSlide bearings(cylindrical)Slide bearings(with collar)Wolf Kunststoff-Gleitlager GmbH • Heisenbergstr. 63 - 65 • 50169 Kerpen-Türnich • Tel. 02237/9749-0 • Fax. 02237/9749-2045