Bearing seizure and cage crack with out any high vibration

Hello guys,

here i attached damaged Fan DE bearing

we inspect this bearing every fourth nightly but the vibration is in with in limits 2.1mm/sec and 0.5g  before failure .as per my point of view bearing seizure due to axial preload ( axial float). if it is float problem please guide me to how to adjust the bearing float.

IMG_20170206_103626775IMG_20170206_103805608IMG_20170206_104215199IMG_20170206_104356720IMG_20170206_104515849IMG_20170206_104719478IMG_20170206_104608948IMG_20170206_104716741

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Original Post

Hi y@sh,

As attached photos, the raceway on the surface of outer ring showed that bearing has axial load because of path pattern clearer and moving into one direction.

The problem also is poor lubrication because brass cage worn, melted and stuck a lot on inner ring's raceway.

Depend on its structure (or design) if you share drawing or picture of application we will discuss more adjusting the bearing float.

Normally, fan housings have one fixed position and another free position for expanding due to increasing temperature during working time.

Hien Le posted:

Hi y@sh,

As attached photos, the raceway on the surface of outer ring showed that bearing has axial load because of path pattern clearer and moving into one direction.

The problem also is poor lubrication because brass cage worn, melted and stuck a lot on inner ring's raceway.

Depend on its structure (or design) if you share drawing or picture of application we will discuss more adjusting the bearing float.

Normally, fan housings have one fixed position and another free position for expanding due to increasing temperature during working time.

Hello Hien Le

Thank you so much your answer, but if it is a axial load problem it has to damage Fan NDE bearing.but damaged bearing is DE.

floating thumb rule is 1/3 rd in board and 2/3 outer board for NDE bearing.

Quote..."we inspect this bearing every fourth nightly but the vibration is in with in limits 2.1mm/sec and 0.5g  before failure ."

I see this was posted 6 months ago but I was wondering, since you said "we inspect this bearing every fourth nightly", can you post a few spectrums from this "inspect"?

My first impression is lack of lubrication, but seems like the data should have shown something, even lack of lubrication, during this inspection period.

I am not sure what is meant by "every fourth nightly". Can you explain? I am sorry for not understanding. Does it mean, checked every 4th night?

Thanks and Have a Great Day,

Ralph

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