F27 subject to alterations Dh = Diameter of guide sleeve Dd = Diameter of guide pin L0 = Free length of spring L1 …Ln = Length of loaded spring, assigned to spring forces F1 …Fn LBL = Length of compacted spring (i.e. wire-to-wire) F1 …Fn = Spring forces in N, assigned to the spring lengths L1 …Ln Sv1 …Sv7 = min. spring preload path, assigned to spring range S1 …S7 S1 …Sn = Spring paths, assigned to spring forces F1 …Fn R = Spring rate in N/mm SA1 …SA7 = Working stroke of spring (stroke) Working stroke of spring SA1 …SA7 = Stroke (S1 …S7 ) – Spring preload path (Sv1 …Sv7 ) Please note: 80% compression must not be exceeded! 1300 N/mm2 100% 0 30% S1 23% 18% *13% 40% S2 *45% S3 50% S4 55% S5 62% S6 58% 80% S7 Sn 1050 N/mm2 600 N/mm2 400 N/mm2 200 N/mm2 0 800 N/mm2 241. h h = = 400 N/mm 280 N/mm2 2 kH kU kO Shear stress admissible Spring Compression Rating (%) max. Cycle Stress Differential Cycle Stress Differential = Cyclic Peak Stress Extended Spring Life Range Limited Spring Range = Lower Cyclic Stress (i.e. preloading stress) F F n F d D A S S S S 1 n L 0 L 1 L 2 L n L BL 2 h D 2 1 H15 preloading force preload Sv * For application within Extended Spring Life: up to a compression rating of 45%, a preloading compression of 13% applies. e. g.: up to a compression rating of 55% a preloading compression of 23% is required. HIGH PERFORMANCE COMPRESSION SPRINGS - TIME AND SPRING LIFE DIAGRAM
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