>> P.454
Table 7 Recommended fits for Steel-on-steel Spherical BushingsConditionNormal operationShafth6,j6Tolerance classHousing boreH7,J7M7,N7RemarkN7 tolerance is recommended for light metal housings. Table 8 Recommended fits for Maintenance-free Spherical BushingsTolerance class of shafth6,j6Tolerance class of housing boreH7,J7,K7RemarkK7 tolerance is recommended for light metal housings. ■Selection of Spherical BushingsSelection between the steel-on-steel type and the maintenance-free type is made considering the oper-ating conditions such as load, lubrication, tempera-ture, and sliding velocity.Load capacity1 Dynamic load capacityThe dynamic load capacity Cd is the maximum allow-able load that can be applied on a spherical bushing under oscillating motion. It is obtained on the basis of the contact pressure on the spherical surfaces. The dynamic load capacity is also used for calculating the life of spherical bushings.The recommended value of bushing load is obtained 405060728582100120142165100192110214---681012151720253035404550607080901001101201401601802002202402602804568101215172025303540455060708090100110120140160180200220240260280300Table 5 Radial internal clearance of GE type (Steel-on-steel)unit: μm■FitdNominal bore dia.mmRadial internal clearanceshown in Tables 7 and 8. The recommended fits for Spherical Bushings are GE…EGE…ESGE…GGE…GSMin.Max.3268With directionally indeterminate loadm6,n6RemarkAlso applicable to bushings with seals.Table 6 Radial internal clearance of GE … EC type (Maintenance-free)numerical by multiplying the dynamic factor, which differs depending on load capacity Cd by a the dNominal bore dia.mmunit: μmbushing type and the load condition. A guideline for Radial internal clearanceselection is shown in Table 9.Min.Max.Table 9 Guide for determination of load1517202530354045506070000040506072RemarkAlso applicable to bushings with seals.K5Type of bushingSteel-on-steelMaintenance-freeLoad directionConstant≦0.3Cd≦CdAlternate≦0.6Cd≦0.5CdWhen the magnitude of load exceeds the value given in Table 9, please consult IKO.The dynamic load capacity Cdt considering the inu-ence of bushing temperature can be obtained from the following equation using the temperature factor.Cdt=ft Cd ……………………………………(1)where, Cdt:Dynamic load capacity considering temperature increase N ft:Temperature factor (Refer to Table 10.) Cd:Dynamic load capacity N (Refer to the dimension tables.)
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