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 |