Slide bearings - Wolf Kunststoff-Gleitlager GmbH

CC CC CCMathematical example13.5.10. Calculation of the maximum mold bearing clearanceThe maximum mold bearing clearance yields from formula (5):PrefaceSemax= ød1in which:A uScrewød1 maxmax− AuWelle:for the lower dimensional deviation of the screw 30d9 follows according to ISO: : 29,883mm:after pressing the bushing into a casing of an ISO-tolerance H5 follows for the “standard” classof bearing clearances an inside diameter of the stuffed bushing of an ISO-tolerance D8according to table 1.Consequently follows an upper dimensional deviation of 30,098 mm according to ISO.As on operation the bushing does not become pressed into a casing of a tolerance H5 but intoan absorption hole of a tolerance H7 according to the construction details, we have to considerthe correction of the absorption hole.by means of formula (1) we calculate the upper dimensional deviation of the bushing pressedinto H7:ContentsMaterialoverviewDesignguidelinesd 1 = Sv + ødmax1 H5in which:S v: increase of the bearing clearance, taken from table 4 with a casing diameter of36 mm follows an increase of the absorption hole of H7 = 14µmMathematicalexampleød1 maxfollows:: according to the dimension list follows a maximum dimension of 30,098 mm for a^ bushing with d1 = 30 mmd1max= 0,014mm + 30,098mm = 30,112mmfrom that follows a maximum mold bearing clearance of:S maxe= 30,112 mm − 29,883 mm =0,229 mmTribologyConditions ofinstallation13.5.11. Calculation of the expected wave cavity caused through the deformation of thebushingThe expected wave cavity caused through deformation can be calculated by means of formula (24):∆ h =p ⋅ skEdin which:sk : wall thickness sk, yields from (D - d1) / 2 = (36mm-30mm) / 2 = 3mmp : taken from section 13.5.1. = 66,66 N/mm 2E d: secant compressive modulus, taken from ill. 36 for stress durations > 100 hat a temperature of ϑL= 75 °C and with a material of ZX-324V2T = 1320 N/mm2Slide bearings(cylindrical)Slide bearings(with collar)Indexfollows:N66,66 ⋅ 3mm2∆h= mm = 0,1515 mmN13202mmWolf Kunststoff-Gleitlager GmbH • Heisenbergstr. 63 - 65 • 50169 Kerpen-Türnich • Tel. 02237/9749-0 • Fax. 02237/9749-2049