Thrust bearing in titanium housing requirement 3

[bobpiet]

I'm scratching my head over this one.

I need to support 500 lbs in a pure axial(minimal radial)load application inside a titanium housing. Sealed from the weather the housing is outdoors. (housing size up to 3" id)

I am considering a stainless steel bearing as being the only reasonable minimally galvanic solution, but alas, no angular contact bearings appear to be available in stainless.

What does anyone out there do with thrust loads outdoors where plain steel bearings might corrode?

Coatings? Sources? Any help appreciated

 

[badservo]

Try a Google search for "ceramic angular contact bearings"

 

[bobpiet]

I never imagined ceramic as a viable option, considering load and durability requirements; but great suggestion, I am researching it now and will post my findings.

Thanks

 

[Tmoose]

I think you'll find The ceramic bearings easiest to get are "hybrid" with some flavor of ceramic balls, and regular old 52100 races.

How about giving the assembly's faying surfaces a couple of coats of the creepy LPS3 ??

 

[bobpiet]

Here is what I've discovered.

Pure ceramic angular contact bearings have much reduced load capabilities over steel, so they won't work with my load in this application.

Hybrids depend on reworking existing races, those races are not available in stainless.

Stainless angular contacts can be made in China, 20,000 part minimum order.

Best idea so far: 1)Moly coat the hard chrome steel bearings and heat cure; 2) coat the outside of the races and the inside of the housing with Dow Corning 4 Electrical Insulating Compound - they claim it will provide the dielectric insulation I need.

 

[caoimhin1]

500 lb = 220kg. Why not just use a stainless steel deep groove ball bearing? Pick the right size and it will take this axial load no problem. Certainly the most cost effective solution. Hybrids and coatings will just magnify your costs enormously...

 

[bobpiet]

caoimhin1,

After going around the block on this one I came to the same conclusion as your suggestion!

I was uncomfortable with using a conrad with a nearly pure thrust load and have received conflicting information on adjusting load ratings in the past. However, after speaking to several engineers at FAG I am confident that the calculations provided by their "Medias" web tool are reliable.

Medias catalog at FAG:

http://medias.ina.de/medias/la/start.do?property&lang=en&mediasS=a-NeEv2B0-97&mediasCall

Select a bearing and a screen with datasheets, CAD drawings and a calculator tab appears. (Language selection on the menu bar)

cheers to all!

 

[H4Marine]

For Titanium we use a composite heavily (>50%) loaded with MoS2. There is only one make of this type of material Maritex. The MoS2 wil work well on Ti dry.

You would need to give the expected pressure in Mpa or equivelant and speed.