Layrub Coupling

  1. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,058
    Location:
    East Yorkshire
    Looking for a suppler of layrub couplings.

    2" c-t-c
    3/8 bore
    1/4"x20BSW

    Piccy the morrow
     
  2. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,058
    Location:
    East Yorkshire
    This in mine stripped. The rubber has failed.
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  3. grim_d

    grim_d Forum Supporter

    Messages:
    1,996
    Location:
    Scotland - Ayrshire
    What about a suitable grade of polyurethane tophat bush?
     
  4. Pete.

    Pete. Member

    Messages:
    8,589
    Location:
    Kent, UK
    Are the bushes captured or moulded in place?

    If you need some PU 'rubber' I have several sizes of several grades.
     
  5. mechman Member

    Messages:
    1,681
    Location:
    great britain n.e.lincs
    Try Winget spares 01204 854650. they're quite helpful. I have that type of coupling on my dumper but think they're obsolete. I think they also might be a tad on ££salty side if available.
     
  6. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,058
    Location:
    East Yorkshire
    Captured. They have a cloth outter, with a wire mesh inner.
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    The thread is not important It could be UNF if necessary
     
  7. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,058
    Location:
    East Yorkshire
    Tell me about it. Stewart Engineering want 56quid a rubber. A rebuilt coupling is 300quid
     
  8. Pete.

    Pete. Member

    Messages:
    8,589
    Location:
    Kent, UK
    So the Rubbers are trapped within the steel plates and the steel inserts are top hat or pull into a taper?
     
  9. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,058
    Location:
    East Yorkshire
    Yes. Its on the output from the sunbeam gearbox. Couples a yoke on the gear box to the propshaft yoke.
    One pair are through holes, the other threaded
     
  10. bricol Member

    Messages:
    820
    N.Yorks, UK
    Google it - maker and distributors come up.
    If you want it to have the same torsional damping properties as the original material did, afraid you're going to have to save up.
     
  11. Pete.

    Pete. Member

    Messages:
    8,589
    Location:
    Kent, UK
    The worn out originals won't have anything like the properties of the new one.

    Any idea what shore number they are? I think I have 60, 80 and 90 shore. Give me some dims too if you can Shox. PU is a sumbitch to turn but I'll have a go at it.
     
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  12. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,058
    Location:
    East Yorkshire
    No idea on the Shore rating, I would say around standard Oring so 80/90 shore.

    If the damping material was machined how would you bond it to the centre?
     
  13. Pete.

    Pete. Member

    Messages:
    8,589
    Location:
    Kent, UK
    You wouldn't. If the centres are bonded then the bushes were moulded around them. You're stuck with either fixing them mechanically or moulding new ones. That's why I asked if the centres were top-hatted.

    You can buy pourable PU for moulding. Now you know why the rubbers are cloth lined, to get them out of the mould.

    https://www.mbfg.co.uk/QL7573.html?...Lze0Ysv6BCHyjEkvpyrZ_Ha5oA-QN_OoaAp0hEALw_wcB
     
    Parm likes this.
  14. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,058
    Location:
    East Yorkshire
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  15. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,058
    Location:
    East Yorkshire
    That was my thoughts. They are bonded as they have for and aft forces as the drive line changes lenght, though the splined end of the propshaft should take those movements.
    I have watched a ut vid where someone was pouring their own. While it sounds a good idea, I dont fancy it failing in the middle of nowhere.
     
  16. awemawson Forum Supporter

    I have a vague recollection of someone re-engineering a Hillman Imp half shaft flexy coupling for use on their Sunbeam
     
  17. hotponyshoes Member

    Messages:
    1,520
    Location:
    Somerset. Uk
    Pour a second one as a spare!
     
    ukracer and Shox Dr like this.
  18. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,058
    Location:
    East Yorkshire
    Nice idea, not sure how much a 2nd would cost just for the plates
     
  19. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    14,058
    Location:
    East Yorkshire
    The correct coupling should be available. I bet you can but]y them (all be it UNF) in the states.

    I’ve a feeling I’ve seen them in the LAS aerospace catalog. Im going to call them in the new yr
     
  20. Pete.

    Pete. Member

    Messages:
    8,589
    Location:
    Kent, UK
    You're only making the bushes to swap out. Easier to keep spare bushes than a whole plate. TBH I would give it a try with the £10 starter kit, turn and tap the inner parts, 3d print a mould. It'll cost you £10 and some time.
     
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