Composite dry sliding bearings â maintenance-free and space-saving
Composite dry sliding bearings â maintenance-free and space-saving
Composite dry sliding bearings â maintenance-free and space-saving
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Summary of characteristics of SKFPTFE composite <strong>and</strong> POM composite<strong>dry</strong> <strong>sliding</strong> materialsTable2Characteristics PTFE composite POM compositeComposition steel backing with sintered layer of tin steel backing with sintered layer of tinbronze; pore filling <strong>and</strong> covering layer bronze; pore filling <strong>and</strong> covering layer(5 to 30 µm) of PTFE with lead (0,3 mm) of POMadditivesPermissible specific static 250 250bearing load (N/mm 2 )Permissible specific dynamic 80 120load (N/mm 2 )Maximum <strong>sliding</strong> velocity (m/s) 2 2,5Operating temperature range (°C) –200 to +250 –40 to +110 (+130 for brief periods)Coefficient of friction 0,03 to 0,25 0,02 to 0,20Stick-slip effect negligible negligibleWear layer thickness (mm) 0,2 0,3Lubrication not required initial lubrication requiredAbility to support edge loads fair good(e.g. resulting from misalignment)Ability to carry alternating loads good fairAbility to accommodate linear fair goodmovementMachining of <strong>sliding</strong> surface calibration drilling, turning, (reaming)after moutingRecommended housing tolerance H7 H7for bushingsRecommended shaft tolerance f7 (for d ≤ 75 mm) h8for bushings h8 (for d > 75 mm) h8Required surface roughness R z ≤ 3 R z ≤ 6of mating surface (µm) R a ≤ 0,4 R a ≤ 0,8Permissible surface machining ground drawnof mating surface(drawn)7
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