Anyone can explain the possible failure of roller bearings

[dpuk]

Can anyone give any advice on possible causes of failure on roller bearings?

 

[unclesyd]

This is a very broad subject to start with and involves a lot of parameters and much discussion.
The first thing I would suggest is to get with your bearing suppliers and get some literature about analyzing bearing failures to get you started. All manufacturers have some information. Ask for literature on bearings in general so that you will be familiar with all the parameters in the use of bearings. There is a lot of misunderstanding concerning bearings and their operation.

But the general consensus is that bearings start failing from the following reasons, one, two, or all.
Lack of or improper lubrication.
Installation
Overload
Wrong bearing selection
Enviroment
These are just a few of many.

I’ve found out that in the majority of bearing failures lubrication plays a major role and in many cases is the root cause of the failure. Unless there is a smoking gun that points to failure mode of an inservice failure of bearing that has been performing well over time I will try to test the same bearing with a different lubricant.
It is a lot easier to monitor bearings than to analyze bearing failures. A bearing removed prior to catastrophic failure will yield a lot more information than a basket case.

 

[dpuk]

unclesyd - appreciate your comments.

Do you see any dangers of not having any lubrication, the pressure the bearings have to substain is rather huge.
The steel has a hardness of around 450+ HV and a tensile stress of over 1300N//mm2.

 

[unclesyd]

I don't know if I uderstand you question or not.
Any bearing is going to need lubrication in some form.
Come back with a few more details, size, speed, load, etc.

 

[BridgeQ]

What are you calling "failure"? Is this a single roller or a nest of them?
Lack of lubrication may cause the roller to seize up and thus cause other problems in the connecting structure or are you actually deforming the roller?

 

[Isntbard]

Movement in a direction not anticipated in the design is another common cause of bearing failure. It is commonly assumed that bridges expand in a direction paralel to the bridge centerline. This is not true for wide bridges, curved bridges and sharply skewed bridges. Could movement in an unanticpated direction be causing your problem?