>> P.482
Maximum Operating LoadAs the actual life is affected by many factors such as the material of the sliding surface, the magnitude and The recommended value of bushing load is obtained direction of load, lubrication, sliding velocity, etc., the by multiplying the dynamic numerical factor, which differs depending on load capacity Cd by a the calculated life can be used as a measure of expected service life.bushing type and load condition. For PILLOBALL Rod Ends, the static load capacity Cs must also be con-sidered in determining the applicable bushing load. 1 Life of lubrication type PILLOBALLs PB・PHS(…A)・POS(…A)・PHSB・POSBTable 6 shows the guidelines for maximum operating [1]Conrmation of pV valueload of PILLOBALLs. When axial loads are added in Before attempting to calculate the life, make sure that addition to radial loads, bending stress occurs in the the operating conditions are within the permissible body. Pay attention to this bending stress.range by referring to the pV diagram in Fig.2. When the operating conditions are out of the permis-Table 6 Maximum operating loadsible range, please consult IKO. The contact pressure p and the sliding velocity V are obtained from the following equations. 50P p=Cdt ………………………………………(3)V=5.82×10-4dkβf ……………………(4)where,p:Contact pressure,N/mm2P: Equivalent radial load,N (Refer to equation (2).) Cdt:Dynamic load capacity considering temperature increase,N(Refer to equation (1).)V:Sliding velocity,mm/sdk: Sphere diameter,mm (Refer to the dimensional tables.)2β:Oscillating angle degrees (Refer to Fig.3.)when β<5°, β=5when rotating,β=90 f :Number of oscillations per minute, min-1Permissible range6040201086421mm/N2pContact pressureTypePBPHS(…A),POS(…A),PHSB,POSBPHSALoad directionConstant≦0.3Cd≦0.3Cd Alternate≦0.6Cd≦0.2Cs≦0.16CsPHS … C,POS EC≦0.3Cs≦0.2CsRemark d is the dynamic load capacity and Cs is the static load capacity. Equivalent radial loadPILLOBALLs can take radial and axial loads at the same time. When the magnitude and direction of loads are constant, the equivalent radial load can be obtained by the following equation.P=Fr+YFa…………………………………(2)where,P:Equivalent radial load,N Fr:Radial load,N Fa:Axial load,N Y:Axial load factor (Refer to Table 7.)Table 7 Axial load factorY0.10.20.30.40.5>0.511223345UnusableUnusableFa/FrTypePBPHS(…A),POS(…A)PHSB,POSBPHS … ECPOS … ECLifeThe life of PILLOBALLs is dened as the total number of oscillating motions during which the PILLOBALLs can be operated without failure or malfunction due to wear, increase in internal clearance, increase in slid-ing torque and operating temperature, etc.125102050100200Sliding velocityVmms/Fig. 2 pV diagram of lubrication type PILLOBALLsK33
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