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Text version of the page
| THE CHOICE OF BEARING DIMENSION | ||||||||||||||||||||||||||||||||||||||||||||||||
| The relation of basic rating dynamic load, equivalent dynamic load and basic service life of the rolling bearing is as below: Ball bearing: L=(c/p)3 Roller bearing: L=(c/p)10/3 L - basic service life( 106 round) P - equivalent dynamic load( N .Kgf) C - basic rating dynamic load ( radial bearing is Cr, thrust bearing is Ca) If the bearing is applied under a certain speed, its service life is described by the time, but when used on vehicles it is showed by driving miles. If the "Lh"(h) is service life, "n"(rpm) is rotating speed, fh is service life coefficient, "fn" is speed coefficient, then their relation can be showed as below: | ||||||||||||||||||||||||||||||||||||||||||||||||
| The choice of bearing dimension: | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Dynamic equivalent load: The loads bearing undertakes consist of radial load and axial load. During the actual work, it is seldom that the bearing only support single radial load or single axial load, most of them undertake the combined load from radial and axial direction. Under this circumstance, due to we cannot use the single load of the bearing, we can't use the above formula to calculate the service life of bearing. If we want to calculate it, we must take all the rotating and loads conditions of bearing into consideration. So we need to assume a fixed load which the load direction is on the centre line of bearing. with it we get service life is near to the real data, and this load is called equivalent dynamic load. The equivalent dynamic load of radial bearing can be calculated as below: P=XFr+Yfa In the formula: P is equivalent dynamic load(N, kgf) Fr - radial load( N, kgf) Fa - radial load(N, kgf) X - radial load coefficient Y - axial load coefficient | ||||||||||||||||||||||||||||||||||||||||||||||||