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Product data Page ................4 Load Page ..............57

Equivalent static bearing load Permissible loads for rod ends

âž” fig
Fig 11 If spherical plain bearings and rodends are subjected to load when sta- tionary or making only slight alignment movements, then the permissible load is not limited by wear, but by the strength of the sliding contact layer or the strength of the rod end housing. If the actual load is a combined radial and axial load, then an equivalent static bearing load must be calculated. This can be done in a similar way to the calculation of the equivalent dy- namic bearing load, for radial and angular contact spherical plain bearings usingP Rod ends are primarily intended for thesupport of radial loads acting in the dir- ection of the shank axis. If loads act at right angles to the shank axis ( ), the maximum permissible loadwill be reduced as additional bending stresses occur in the shank. When checking, consideration should also be paid to the rod end head (housing) material which differs depending on design and size. The load directed at an angle oraxially to the rod end (to the direction of the shank axis) should never ex- ceed the value of 0,1 C
11 Rod end under combined load Factor b . If heavierloads are involved then a larger rod end should be chosen.The maximum permissible load for a rod end in the direction of the shank axis can be calculated from P
= yF
r and for spherical plain thrust bearingsusingP
=yF
a perm =C
b
2 b
6 whereP whereP
=equivalent static bearing load,kNF
perm =maximum permissible load, kNC
r =the radial component of the load,kNF
=static load rating, kNb
2 =temperature factor • for rod ends requiring main-tenance (
a =the axial component of theload,kNy=a factor which depends on theratio F âž” Table
5 , page24 ) • for maintenance-free rodends with the sliding contact surface combination– steel/sinter bronze composite(
a /F
r –for radial bearings requiringmaintenance ( âž” Diagram
1 , âž” Diagram , page 26 )– steel/PTFE fabric (
6 for rod end load type page 19 )–for maintenance-free radialbearings ( âž” Diagram
16 , page 27 )– steel PTFE composite (
Table 2 âž” Diagram
2 ,
Type of loadFactor page 19 )–for angular contact sphericalplain bearings ( âž” Diagram
17 , page 29 )b
(magnitude and direction) b 6 âž” Diagram
3 ,
19 Constant1Pulsating magnitude (single direction)0,5(0,35)Alternating direction,0,5(0,35) page 19 )and on the ratio F
6 =factor for the type of load (
+F r r /F
a âž” Table
2 ) –for spherical plain thrust bear-ings ( âž” Diagram
4 , page 19 )
+F r +F r –F r The values in brackets apply to rod ends with lubrication hole or nipple 20