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Thread: Life-sealed Idlers with Taper Roller Bearings

  1. Life sealed Idlers with Taper Roller Bearings

    I would like to know wheter Idlers fitted with taper roller bearings be life sealed with grease?
    K.R. Baskar
    Kali Material Handling Sysems
    www.kalimhsonline.com

  2. #2
    Join Date
    Sep 03
    Posts
    5
    Brockway Conveyors have done an out-board type roller with taper roller bearings sealed with grease.

  3. #3
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

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    Seal-for-life greasing of tapered rollers is not condoned by the bearing mfgrs. Some do it when the ambient temperature variation is small such as in underground mines or in tunnels.

    Special greases have been tried. It is a continuous trial by the operators to see if they can get away without tapered roller bearing greasing. Molydisulfide (fine sphere) grease additive has been somewhat effective.

    Since the tapered roller acts as a grease pump, history has shown greasing is the norm.

    I also hope to learn from the question.

    Lawrence Nordell
    Covneyor Dynamics, Inc.

  4. Dear Baskar..

    Here in South Africa we used to use the Jeffrey "Permaseal" idler roll which was as you described, with permanent seals and taper roller bearings greased for life.
    These were extremely successful, (and I have a 3.5km horizontally curved overland conveyor still running on them after 12 years).
    Although it was thought by many that the good life was due to the high load rating of the bearing, many considered it to be attributed to the very good sealing properties of the permaseal that protects the bearing.

    After all, an idler is only as good as its seals.

    This type of idler is seemingly no longer in normal use here now. Probably not competitive against the conventional ones, as the bearings are expensive and the shafts have to have more conservative diameters to avoid deflection under load at the bearings, for which is less is allowed for taper roller.

    Best regards

    LSL Consulting & Tekpro Projects
    Graham Spriggs

  5. A couple of comments:
    1. The Jeffrey Permaseal rollers referred to by Graham Spriggs, although not regreasable had a grease reservoir. This had the form of an inner tube running over the shaft between the bearing housings, which was filled with grease.
    2. The taper roller bearing has to be accurately set in order to obtain good performance.
    3. As per G Spriggs' comments the shaft diameter has to be increased to reduce the effects of bearing misalignment on bearing life. Developments have resulted in improvements, but, based purely on design, it is still prudent not to exceed angular deflections of the order of 4minutes of arc when using taper roller bearings (as compared to 8minutes generally for deep groove ball bearings).
    4. The effect of sealing in idler rollers is extremely important. The company I represent, Melco, have rollers (of ball bearing type)running in the Syferfontein overland conveyor system for 13 years with a total failure rate to date of about 12% of the original supply.

  6. #6
    RichardEC Guest

    Life-Sealed Idlers

    We design and manufacture standard and special wheels, cam followers and rollers that incorporates the Plesh "Revolube" process. You will never need lubrication again, seals out contaminates, unaffected by environment (see data on web site). We can design special bearings for your application. Contact Richard Ciesla at Plesh Industries, Buffalo NY
    716-873-4916 x250 for your specific application and info. www.plesh.com

  7. #7
    techengg Guest

    Life sealed Idlers

    As Richard said, I can design special bearing assemblies, which can be packed with grease for life untill the service life of the bearings, duly rated for the kind of load and speed.

    Please feel free to query them with me in case you have any such requirement.

  8. #8
    RichardEC Guest

    Revolube Advantage

    Plesh "Revolube" process does "not" use grease. Revolube is a proprietary process which injects a lubricant paste into the bearing cavity, baking at a high temperature to form a dry solid lubricant, which deposits a 2 micron thick film of praphite on all friction surfaces of the bearing. Along with the special seal design the bearings are sealed for life, thus never needing lubrication ever. The "Revolube" advantage is great for both high temperature (660F) and low temperature (minus 250F) applications. Effective in high vacuum and submerged applications and perfect choice in limited or inaccessible areas.
    Richard Ciesla
    716-873-4916 x250
    www.plesh.com

  9. #9
    techengg Guest

    Praphite coat

    Hi Richard !!

    Good morning ! Can you let me know something more on this technology of praphite coating using a solid dry lubricant !!

    And also appraise me with your profile of work and your expertise in this field. I wish to meet you if I can and work with you for some experience on this technology.

    My Regards,

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