Shaft Coupling

Coupling is a core component that transmits power and motion
from the driving shaft to the driven part while absorbing misalignment
and any possible factors that could reduce efficiency of machines
(e.g. vibration, noise, electric current, etc.)

SK Series

Schmidt-Kupplung Coupling

Selection sequence
The selection of the Schmidt coupling is determined by the various performance parameters. These include torque, speed and occurring displacement.
The influences of these parameters are described below :
Selection according to torque

To calculate the dimensioning moment TD, please multiply your drive torque TA with the corresponding performance factor F and the expected load factor K.

Select the anticipated operating speed of your application combined with the desired service life in hour.

Example:
– Anticipated operating speed : 1,000 rpm
– Desired service life : 10,000 h

Performance factor F: 3

Load factor K
Uniform Light shocks Medium shocks Heavy shocks
1,0 1,25 1,75 2,25
TKN > TD
Select a coupling whose rated torque TKN is larger than the calculated dimensioning torque TD

※ Make sure that the maximum torque of coupling TK max is not exceeded.

Selection example (Application: Roller drive in automatic lamination machine)
Required conditions
Requested maximum radial offset △Kr : 40mm
Drive torque TA : 50Nm
Operating speed : 200 rpm
Desired service life : 10,000 h
Expected load factor K : 1.25 (light shocks)
Selection
Performance factor F : 2
Dimensional torque TD = 50Nm x 2 x 1.25 = 125 Nm
Select a coupling whose rated torque TKN is larger than the calculated dimensioning torque 125 Nm
Appropriate size: SK 7.7.9/3
(TKN: 150 Nm / TKmax: 290 Nm)
Lubrication Period

The Schmidt-Kupplung, except for size SK 4.2.6/3, SK 4.2.8/5, SK 4.5.6/3 and SK 4.5.8/5, has a lubrication fitting for regreasing. Adequate lubrication is required for full operating life. The Schmidt-Kupplung, should be regreased exclusively with Klüber Staburags NBU 12-300 KP. Mixing lubrication is not recommended and will reduce coupling operating life.

Standard
Curve 1 Curve 2 Curve 3 Curve 4 Curve 5
SK 7.3.7/3 SK 10.5.12/3 SK 13.6.14/3 SK 16.7.16/3 SK 20.9.20/3
SK 7.3.9/3 SK 10.5.12/4 SK 13.6.16/4 SK 16.10.16/3 SK 20.15.20/3
SK 7.7.9/3 SK 10.9.12/3 SK 13.9.14/3 SK 16.7.18/4 SK 20.9.25/4
SK 7.7.12/4 SK 10.9.14/4 SK 13.9.16/4 SK 16.10.18/4 SK 20.15.25/4