Products
Connecting Shaft
(Line Shaft)

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Connecting shaft is a compact solution which enables to transmit
motion accurately, especially when there is a longer distance
between shafts of an application.

  • Why Connecting Shaft?
  • How to determine the proper length(L)
  • How to calculate permissible parallel misalignment
  • How to calculate Torsional Stiffness

Product Overview

Why Connecting Shaft?

How to transmit motion when there is a longer distance between the shafts?

It is recommended to use a connecting shaft rather than a coupling + ground shaft combination.

Combined set of coupling + Ground shaft
  • 3 different parts (2 Couplings, 1 ground shaft) are separately needed.
  • Bigger laboring required
  • Hard to keep the appropriate straightness
    between couplings each end and
    a ground shaft
Connecting Shaft
  • 1 Whole piece structure
  • Simple installation
  • Easy and handy maintenance
  • The hollow shaft with high stiffness

How to determine the proper length(L)

General Side-clamp Type
Drawing of General Side-clamp Type

L(Total Length)= Ls(distance between shafts)+ 2L1

Side-clamp Hub Split Type
Drawing of Side-clamp Hub Split Type

L(Total Length)= Ls(distance between shafts)+ 2L3

Side-clamp Hub Split type is commonly used for connecting shaft in regards to an easier maintenance.

How to calculate permissible parallel misalignment

Pm=L-2L1+L2×tanAm2
  • Pm = Permissible parallel misalignment
  • L = Total length
  • Am = Permissible angular misalignment of connecting shaft
    (= 2 x coupling’s value)
  • The value calculated by the above formula is maximum permissible parallel misalignment in the allowable range of motion transmission, which means sleeves of SJCL and plate spring of SHDL may still get worn down even within the range of permissible parallel misalignment.
  • The Pm value shrinks by ½ when there are both angular and parallel misalignment at the same time.
  • It is recommended to use at the ⅓ value of Pm for longer lifespan, as well as keep the shafts located in line as straight as possible.
  • If you need any further assistance, please contact Sung-il Customer Service team for more details.

How to calculate Torsional Stiffness

TSL=12×1TSc+LpipeTSs (N·m/rad)
  • TSL = Torsional Stiffness of Connecting Shaft
  • TSC = Torsional Stiffness of Coupling
  • TSS = Torsional Stiffness of Pipe / m
  • Lpipe = Length of Pipe [ Lpipe=L-2L41000 (m)]