## General Mechanical

#### Ball bearings

• a904979
Subscriber

Hi everyone;

I'm doing some simulation in which I want to analyze the assembly behaviour after being submmited to an external force. This assembly is made by different solid parts and ballbearing... but I don't know how could I parametrize those ball bearing.

Anyone could help me out?

• peteroznewman
Subscriber

Please show some images of the geometry and expand the details of the loads and boundary conditions.

• a904979
Subscriber

Hello Peter:

First of all, thanks for answering to my question.

Here you have a simplification of my model which is composed by an external part with two ball bearings inside it and a shaft through of those bearings.

There is a fix support in one of the shaft’s extreme and a force apply on the external part.

I don’t have identified yet which ball bearing I will be use.

Let me know if it is enough information or not.

Thanks

PM

• a904979
Subscriber

Hello Peter:

First of all, thanks for answering to my question.

Here you have a simplification of my model which is composed by an external part with two ball bearings inside it and a shaft through of those bearings.

There is a fix support in one of the shaft's extreme and a force apply on the external part.

I don't have identified yet which ball bearing I will be use.

Let me know if it is enough information or not.

Thanks

PM

• peteroznewman
Subscriber

Hello PM,

A simple way to represent two ball bearings in this assembly is to put one spherical joint at one end of the cylinder and a general joint at the other end of the cylinder. You should split the face of the shaft and cylinder at the planes where each bearing race will seat. The spherical joint supports 3 DOF.  Assume the X axis is along the shaft. The general joint should constrain displacement in Y and Z and leave X displacement free. Normally, you want the cylinder to spin about the X axis, but that would not support a Static Structural analysis with the force you show. So set the rotation about X to 0 while leaving the rotation about Y and Z free.

Peter

• a904979
Subscriber

Hello Peter,

Okey, thanks for all. I will try in the way that you explain me.

Anyway, if I had any question, I would write you down again, okay?

Best regards,

PM