Lets See How Good You Are At Establishing the Failure Mode of this Bearing
 

Here are a few pics of a bearing I checked out last week. There are a few interesting things at work here. Lets see what you guys come up with. feel free to use assumptions but keep in mind, the bearing is oil lubricated from a pump. It holds a shaft that is turning a Titanium alloy cowl for the aerospace industry. Very high pressure, very dirty, very hot.

http://forums.pelicanparts.com/uploa...1166571844.jpg http://forums.pelicanparts.com/uploa...1166571860.jpg http://forums.pelicanparts.com/uploa...1166571874.jpg http://forums.pelicanparts.com/uploa...1166571910.jpg http://forums.pelicanparts.com/uploa...1166571952.jpg

One side is a thrust bearing and the other is roller bearing.

The flew is outa sque on the treadle

The technical term for this particular failure event is "fukt up." It results from the bearing undergoing heat and friction forces outside its design specifications. Happens all the time in flux capacitors.

Actually there are at least 4 failure modes at play...Scott and Supe...sorry dudes.

Is that a Torrington tapered bearing?

Chicken and egg dilemma.

I’ll speculate the taper attachment came loose from either the threaded end breaking off first or the nut just coming loose. During the “running loose” period, the bearing failed from the high vibration loads. When the bearing failed, the taper nose of the shaft completely failed.

Judging by the size of the components, I suspect the rotating mass must have been significant. Hopefully no one was injured.

Best,
Grady

Re: Lets See How Good You Are At Establishing the Failure Mode of this Bearing
 

Bad lube. That was easy! What do I win?

Turbine shaft/jet engine/reversing thrust?

Shaft is slipping inside the bearing, which equals heat and a breakdown of the hard face ?

Motormeister will repair it for $695.00

LMAO!!!!! Good one Craigster59!

Is it a twin row tapered roller bearing and is that one of the rollers sitting on top of the casing in the individual photo?
Was the damage visible caused by parts of the bearing itself or was there some nasty introduced to the bearing possibly via the oil feed?

Certainly the bearing has siezed, spun in it's housing, and probably dropped a roller. I'd guess that dropping the roller probably freed it back up due to the additional play which caused the shaft to run out-of true, probably lost control of it's end clearance and ran whatever the titanium part mounted to the shaft was into the nearest immovable object.

But that's just a wild stab in the dark...

How did the pump check out ?

Yep, they will only replace those parts needing replacement, using their skills at rebuilding bearings in race cars.

OK I'll give it a shot. Even though I don't have any reference material here at home.

The roller pitting looks like overloading or corrosion.

The color in the outside race indicates over heating. There also appears to be galling / pitting in the overheated area to indicate overloading. Is this the thrust / load direction?

I cant tell what you are showing us in the picture of the shaft.

The pic of the end of the bearing races looks like corrosion or foreign material intrusion.

I will assume that overloading was prevented by design engineering, so, heat, pitting, foreign material... possibly the lube pump inlet slowly became blocked causing bearing over heat and failur. Maby throw in a baked seal or two? From what is presented that would be my first guess.

OK let the flaming begin :D

it'll buff out?

Does this have anything to do with your butt?

Wow 16 posts and no one has started to rant about Iraq or President Bush.

The discombobulator was miscalibrated?