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  • low temeprature bearings

    Discussion in 'The main mechanical design forum' started by east64, Feb 2, 2012.

    1. east64

      east64 New Member

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      Can you advice me , please, for bearings working normaly (easy) in extremly low temperatures as -50 C ?
       
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    3. tonycro

      tonycro Well-Known Member

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      sorry, just some quick random thoughts.

      Ball/roller bearing I guess ?


      You need raceways that can cope with the temperature, and what are the bearings losses, will it rise above -50 when running ?


      And a grease that can cope with the temperature as well !

      or, can you have a std bearing and pre-heat before use ? Magnetic bearings ?


      Tony
       
    4. east64

      east64 New Member

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      I will give here more details. You guess right - ball bearing. Bearing is nested in aluminium body and here is the problem. Expansion coeficient of Al is greater then those of steel (bearing) and when the temperature sinks to -40... -50C , the Al tights the bearing and it begins to work heavily. Other problem is the grease. Standart bearins are in sale with grease which works appr. up to -30 C. I guess I must order bearings with suitable for my case grease.
      Victor
       
    5. tonycro

      tonycro Well-Known Member

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      I suppose the first question is, can you change the housing ? If not, can you use a bearing with a larger internal clearance to compensate, C3 or bigger - which may help with the grease selection ?

      tony
       
    6. east64

      east64 New Member

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      Yes, the housing could be changed. About grease, the producers of beaings give as option to fill the bearing with custom grease. So it is possible to order grease with temperature range -70 ....+140 for example (Toray Silicone - SH33L)

      Victor
       
    7. Chad Kopke

      Chad Kopke New Member

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      Have you considered switching to ceramic bearings? They are temperature stable and do not require lubrication.
       
    8. vic.blackall

      vic.blackall Well-Known Member

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      The ball bearing could be secured in a steel housing and the housing fitted into the alum. housing and then specify a low temperature grease for the bearing. It is not that easy to come up with a definitive answer to your question without further information, i.e. speeds, loads, envirement etc:
       
    9. Gregory L Thompson

      Gregory L Thompson Member

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      the answer to your question isn't in type of bearings for low temp, but a grease or oil which ever application is needed in your case but I know of a couple manufacturers that make lubricants that function very well in that temp and even much lower if interested get back with me e-mail gttrucks_@hotmail.com here is most over looked cause of metal parts failing bar none what is the first and most important job of any lubricant oil grease or other " To Prevent to Surfaces from touching" creating a barrier between 2 metal surfaces eliminates metal nurling bearings blue at 286 deg fh nurl at 324 deg fh what cause heat friction of course reduce friction reduce heat this works well as temp insulator in cold environment,
       
    10. vic.blackall

      vic.blackall Well-Known Member

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      Greg, In my understanding the original posting refers to the contraction of the aluminium housing causing a possible reduction in internal clearance in the bearing, the type of grease for a low temperature application was a secondary issue. Off the self ball races with low temperature grease are available and the use of one of these in a separate housing and attention to the mating component tolerances should, I think, be the path to follow.
       
    11. Gregory L Thompson

      Gregory L Thompson Member

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      Ok here something that you might be interested end this company is Schaeffer Specialized Lubricant Mfg. St. Louis MO look them up online they manufacture an open gear compound available in spray canand tubes an cans, a little goes along ways this product is not like any other open gear lube this stuff is wild, this company is big molybdium dysulfide it is slikest known lubricant to science schaeffer grinds there moly to 10 times finer than womens face powder, so small that particles are so small the are suspended in an oil molacule Soluable Moly, well this lube only requires a finger prints thickness it withstand 500,000 pounds of metal to metal shear to remove this will assure the housing and bearing maintains bearier, Molybdium Dysulfide has a natural characteristic of plating it self to 37 platelets this verified by NLGI and Timken Bearing Testing
       

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