DIN_988相关标准规范

UDC621.887.7March 1990Shim rings and supporting rings西988PaBscheiben und StutzscheibenSupersedes May 1971 edition.In keeping with current practice in standards published by the International Organization for Standardization (ISO),a commahas been used throughout as the decimal marker.Dimensions in mm1Scope and field of applicationShim rings are designed to prevent machine components from moving axially.The preferred application of these rings is tocompensate for the play of such components where secured by circlips as specified in DIN471 and DIN472.DIN983 andDIN 984 or lock washers as specified in DIN 6799.Shim rings may only be used where the contact faces are smooth.They shallnot suffer any deformation when used with components that have rounded edges(shaft collars.stepped holes).Supporting rings are intended for use with circlips or lock washers to ensure that do not deform when subjected to excessiveaxial forces as may be expected where the edges of machine components are rounded or chamfered.Supporting rings may be used in combination with shim rings.Shim ringSupporting ringCirclip (washer)Circlip (washer)The illustration appliesby analogy for ringsused in bores.It should be noted that where shim rings and/or supporting rings are used as part of rolling bearings,there may be the risk ofthe rings scraping against projecting parts of the cage,or the inner or outer bearing ring.2Dimensions and designation回Φ2IT10h2.1 Shim ringsDesignation of a shim ring with inside diameter.d,=40 mm.outside diameter,d=50 mm,and thickness,h=0.5 mm:Shim ring DIN988-40×50×0.5Continued on pages 2 to 6152