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Expansion Bolt (EB) The Nord-Lock Group

Expansion Bolt (EB) The Nord-Lock Group. Standard Technology. Fitted bolt Flange positioning. Standard Technology. Fitted bolt Flange positioning Hole rework. Standard Technology. Fitted bolt Flange positioning Hole rework Assembling. Axial tightening reduces diameter.

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Expansion Bolt (EB) The Nord-Lock Group

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  1. Expansion Bolt (EB) The Nord-Lock Group

  2. Standard Technology Fitted bolt • Flange positioning

  3. Standard Technology Fitted bolt • Flange positioning • Hole rework

  4. Standard Technology Fitted bolt • Flange positioning • Hole rework • Assembling • Axial tightening reduces diameter

  5. Standard Technology • Flange moves by transmission load. • Punctual load on fitted bolt and flange. Transmission features

  6. The new technology: Expansion Bolt Types: • EBC Coupling Access on both sides • EBB Blind holeAccess on one side • EBA Anchor Just radial preloading

  7. Expansion Bolt Expansion Bolt, installation and function • Flange positioning

  8. Expansion Bolt Expansion Bolt, installation and function • Flange positioning • Radial alignment

  9. Gap Expansion Bolt Expansion Bolt, installation and function • Flange positioning • Radial alignment • Adjusting axial travel

  10. Expansion Bolt Expansion Bolt, installation and function • Radial Preload

  11. Expansion Bolt Expansion Bolt, installation and function • Radial Preload • Additional axial preload

  12. Expansion Bolt Load transmission • Radial preload guarantees steady contact with bore • Larger tolerances on bores and alignment are possible

  13. Expansion Bolt VS Fitted bolt Fitted Bolt Expansion Bolt

  14. Expansion Bolt VS Fitted bolt Fitted Bolt Expansion bolt Preload Under load/ in Operation

  15. Tightening space a) Hydraulic tensioning A ≈ 2.1 x d D ≈ 2.1 x d b b) Expansion Bolt

  16. Safety Comparison of tightening procedure • Example: Bolt M64x6, L/D=5, preload 0.7 x Re (Elastic limit) Torsional tensioning Hydraulic tensioning Superbolt

  17. Shaft Coupling with Expansion Bolt

  18. Shaft Coupling with EBC

  19. Shaft Coupling with EBB

  20. Pelton Runner with EBC

  21. Thank you for your Attention

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