Question on maximum axial loading of a tapered roller bearing

[LewisCobb]

Hello -

I’m in the process of trying to determine a spec on some Timken tapered roller bearings.

Here’s the catalog –

http://catalog.timken.com/WebProject.asp?CodeId=7.5.9.9&bookcode=trb12#

The bearing P/Ns are as follows –

Timken 16284-B Outer Cup
Timken 16150 Inner Cone

They are shown on page 434 of the above catalog

What I am trying to find out, is the maximum static axial load that the cone can be pressed into the race without damaging (brinneling?) the race. It’s actually listed in the abbreviations on page 15 as “Coa” but in the spec for the bearing p/n on page 434 it’s not shown. Only “Co” – which is the static radial load rating. This is for a specialized pushing clamp that I am fabricating to extract a spindle from a machine lathe. There is a shouldered bronze sleeve on the spindle through the ID of one of the headstock bearings, and it's used to develop the necessary preload in operation. Trouble is, the spindle will not release from the sleeve and as the clamp is developing force on the spindle, that's being transferred directly through the cone into the cup. I want to prevent damage as I attempt to extract the spindle. This is being done after all the usual attempts with heat, dry ice packed into the bore etc. (i.e. I tried all the low hanging fruit first - ha)

I sent a query to Timken but with the July 4 holiday and all I am not sure I'll hear from them any time soon.

Thanks !
Lewis

 

[dinjin]

On page 133 they list 16137 16284 combination which is the same series, so I would assume that load is correct for all of the bearings in the 16000 series.

 

[dinjin]

Sorry, the parts are on page 129. I think you can divide the values shown by the K factor to get the axial static loads similar to the dynamic loads.

 

[Tmoose]

Generally, at least for ball bearings, the maximum static load WILL produce small physical dents in the bearing components. Probably not real desireable in a machine tool spindle.

 

[LewisCobb]

I had a chance to call Timken today and get an applications engineer on the phone.
The static axial spec on these bearings is a lot higher than I thought - it's 77.3kN or 17,300 pounds.
There's no way I have come anywhere close to this with the clamp I have been using, so I'm going to sneak up the pressure a bit to see if it will cooperate.

Thanks,
Lewis

 

[unclesyd]

There is a very good paper from NASA on the load carrying ability of of said bearings, case in point several years ago the had standard tper roller bearings run at 1,000,000 DIN. The accomplished this by injecting lubricate through the outer race. There was a lot of other information in this paper about operating in the “normal operating range”.