>> P.456
Before attempting to calculate the life, make sure that the operating conditions are within the permissible range by referring to the pV diagram in Fig.4. When the operating conditions are out of the permis-sible range, please consult IKO. The contact pressure p and the sliding velocity V are obtained from equations (3) and (4) shown on page K6. [2]Life calculationThe life of maintenance-free spherical bushings is obtained from the total sliding distance S which is given in Fig.5 for the contact pressure p obtained from equation (3). The total number of oscillations and life in hours can be obtained from the following equations. G=16.67×b1 Sf V…………………………(7) G Lh=60f……………………………………(8)where,G:Life (Total number of oscillations)b1:Load directional factor (Refer to Table 14.)S:Total sliding distance m (Refer to Fig.5.) f:Number of oscillations per minutemin-1V:Sliding velocitymm/s Lh:Life in hourshWhen alternate loads are applied, this range is also permissible.Permissible range1006040201068421N/mm2pContact pressure124610204060100200Sliding velocityVmm/sFig.4 pV diagram of Maintenance-free spherical bushingsTable 14 Load directional factor b1 (Maintenance-free)×105 ……………(5)……………………………………(6)where, G:Life (Total number of oscillations) b1:Load directional factor (Refer to Table 12.) b2:Lubrication factor (Refer to Table 13.)b3:Sliding velocity factor (Refer to Fig.3.)Cdt:Dynamic load capacity considering temperature increaseN(Refer to equation (1).) P:Equivalent radial loadN (Refer to equation (2).)Lh:Life in hoursh f:Number of oscillations per minutemin-1Table 12 Load directional factor b1 (Steel-on-steel)Load directionConstantAlternateLoad directional factorb115Table 13 Lubrication factorb2Periodical lubricationNoneRegularLubrication factorb21150.20.5151050100150Sliding velocityVmm/setanretlA:noitceridtnatsnoC:ndaoLoitceriddaoL345210.50.40.30.20.10.050.040.030.020.01b3Sliding velocity factorG= 3.18b1b2b3 Cdt2 dkβ P G ( )Lh=60fcalculated from the following equations.[2]Life calculation 2 Life of Maintenance-free spherical bushingsThe life of steel-on-steel spherical bushings can be [1]Conrmation of pV valueFig.3 Sliding velocity factorLoad directionConstantAlternateLoad directional factorb110.2(1)Note(1) his value is applicable when load changes com-paratively slowly. When the load changes rapidly, please consult IKO, as the factor degreases sharply. the K7
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