Kloubová oka Fluro

18 FLURO ® -Gelenklager GmbH F f B = 1 f B = 0,5 Bearing load ratings Bearing Load ratings are bearing specific data, derived from the characteristics of the materials used. They are used when selecting Spherical Plain Bearings or Rod Ends for a particular load, but may have to be reduced in adverse operating conditions. Static load ratings C o [kN] C o indicates the maximum permissible static load which a Rod End at its weakest cross section can withstand without developing permanent distortion. The C o values listed in the tables of this brochure have been calcula- ted by using the appropiate material specifications and have been tested on a number of Rod Ends during tensile tests carried out at ambient temperature. 80% of the yield strength resulting from the tests have been used so that a safety factor of 1.25 is included. The static load C o is also used for establishing the maximum axial load which is limited by an additional bending stress principally due to the method of faste- ning of the insert. Following are maximum axial values (deformation) which have been established by pressure testing: (1) F a = F a, max = a . C o [kN] a = <~ 0,4 for GI/GA + GIO/GAO + GXO a = <~ 0,2 for GXSW, GXS, GL mounted in a FLURO ® rod end housing a = <~ 0,1 for EI/EA, EI/EA...D-NIRO For Spherical Plain Bearings C o indicates the radial load, which does not deform the mating surface perma- nently. Precondition is the stable configuration of the housing. Dynamic load ratings C [kN] This rating is used to establish the working life of Spherical Plain Bearings or Rod Ends when under dynamic load conditions. That is to say when they oscil- late, rotate or pivot under load. The values listed in the table result from multiplying the maximum surface pres- sure p max admissible in gliding movements by the pro- jected bearing surface. A proj , whereby a specific load tating is established for each type of Rod End. The established standard values for maximum surface load for various combinations of antio friction material have been listed in table 1 which allows for movement when oscillation. Information: Depending on the material strength of the Rod End housing (eg. pages 34 and 35) the static load might be lower than the dynamic load. For this the procedure stated on page 23 has to be observed. Technical Information variable insert p max [N/mm 2 ] constant Time t Housing Ball d k St/Ms St/Bz St/St St/St St/TBz St/TNy soft hard 50 50 50 100 150 50 Table 1: Maximum surface pressure Abbreviations: St = Steel, Ms = Brass, Bz = Bronze, TBz = Woven Bronze Fabric, TNy = Woven Nylon Forces affecting a Bearing The loads affecting a Spherical Plain Bearing can vary. They can be: intermittent, constant or variable (illustration 1) static or dynamic Picture 1: Load factors - check f B Attention: For Rod Ends with male thread factors choose f B = 0,35 when load changeable. Forces when under static load Radial only (F r ) or radial and axial (F a ) forces arise and there is no movement between the ball and the insert (Picture 2). Picture 2: Radial and axial forces Forces when under dynamic load Radial or radial and axial forces arise, when the Ball pivots at angle , oscillates at angle ß or rotates relative to the Insert. For applications with threshold or/and alternating loads, the dynamic load rating of the rod end housing needs to be considered separately.