equivalent load of a deep groove ballbearing
equivalent load of a deep groove ballbearing
(OP)
Goodmorning !
I need to find a formula to calculate the equivalent load of a deep groove ball bearing wich is loaded with an axial load, a normal load and a torque load.This torque pushes the outer ring on one side to the right, 180 degrees further to the left.
How do you calculate this ??
Thanks for the answers
I need to find a formula to calculate the equivalent load of a deep groove ball bearing wich is loaded with an axial load, a normal load and a torque load.This torque pushes the outer ring on one side to the right, 180 degrees further to the left.
How do you calculate this ??
Thanks for the answers





RE: equivalent load of a deep groove ballbearing
I'm having a hard time understanding what you meant by torque load... a moment on the shaft?
RE: equivalent load of a deep groove ballbearing
RE: equivalent load of a deep groove ballbearing
RE: equivalent load of a deep groove ballbearing
In fact my application is the head of a swivel castor. The bearing(s) in the head are most of the time under a static load. I want to design a optimised swivelhead with standard bearings. So to know how to calculate the bearing(s) would be very helpful.
There are designs on the market where they use only one deep groove ball bearing,,even for castors up to 1000 kg ! Most designs use one axial trust ball bearing and one deep groove ballbearing or one spherical bearing. As the assembly is hyperstatic it is very diffucult to make some calculations. Relying on try and error is expensive and time consuming....
Does there exist an eqation or tables where you can find the allowable moment on a bearing ?
All ideas are appreciated !
RE: equivalent load of a deep groove ballbearing
I think you can be on the safe side if you will assume that the tilting torque is carried by two sectors of 90 degrees resisting the tilting torque. Therefore, if the ball bearing can carry an axial force of let say 1000lb then the torque it can carry will be 250 lb multiply by the bearing diameter (the diameter where the balls are located).
By the way, I recall seeing (many years ago) a patent for missile fin supported by only one large diameter bearing as you are trying to do.
RE: equivalent load of a deep groove ballbearing
1. It is not a simple calculation
2. To calculate the pure moment load capability of a deep groove ball bearing from first principles requires knowledge of internal bearing geometry which I doubt you possess, although if you are friendly with bearing reps you can sometimes get it
3. It is not a good application for deep groove ball bearings - the loads on the balls become excessivly high. They are intended for radial load and a limited axial load. The designs incorporating a thrust bearing sound better. It is no accident that you cannot find the procedure for doing this calculation in bearing catalogs!
4. Although I am not one of those people who always rely totally on manufacturers recommendations in the case of bearings, in this case you may have to. But lets see what others have to say.