>> P.458
2 When the load acts in the Yu direction ;Select the housing material considering the tensile stress obtained from the following equation. σ2= F C(DH-D)k ………………………(10)where, σ2: aximum tensile stress occurring in the housing boreN/mm2F:Applied loadNC:Width of outer ring and housingmmDH:Outside diameter of housingmmD:Outside diameter of outer ringmmk:Stress concentration factor (Refer to Fig.7.)0123456789DH/DFig.7 Stress concentration factor 9876543210kStress concentration factor■Operating Temperature RangeThe operating temperature range for Spherical Bushings with seals is -30゜C〜+80゜C.The maximum allowable temperature for Spherical Bushings without seals is +180゜C for the steel-on-steel type and +150゜C for the maintenance-free type.■Precautions for UseDesign of shaftWhen the load is large, sliding may occur between the shaft and the inner ring bore of bushing. For such cases, it is necessary to prepare the shaft with a hard-ness of 58HRC or greater and surface roughness of 0.8 μmRa or less.Furthermore, attention must be paid to the strength of shaft because the shear and/or bending stresses in the shaft may surpass the allowable values even when the load is below the static load capacity of Spherical Bushings.Design of housingThe housing should have sufficient rigidity to avoid harmful deformation under load. When the housing shown in Fig.6 is used, it should be designed with sufficient strength as follows.CDDHYUFFYLFig.6 Shape of housing 1 When the load acts in the YL direction; Select the housing material considering the compres-sive stress obtained from the following equation. σ1= F CD ……………………………………(9)where, σ1: aximum compressive stress occur-ring in the housing boreN/mm2F:Applied loadNC:Width of outer ring and housingmmD:Outside diameter of outer ringmmK9
| < 
| 
> | 
>>
