Idle-rotation overload system (load-separating)
High repeating accuracy
Flange design for the mounting of pulleys or sprockets
Combination with ROTEX®, GEARex® or RADEX®-N for shaft-to-shaft connections
The intelligent further development to the shear pin coupling and hydraulic overload systems
Setting range to 60,000 Nm (higher torques on request)
The core of the overload system is formed by the idle rotation elements. In case of overload they uncouple the driving and driven side while protecting the drive train from damages. After eliminating the overload, the rotation segments are manually re-engaged so that the drive is released again.
Setting the release torque
In order to set the coupling to the requested release torque, a defined pre-stress is generated on the disk springs in each idle rotation element via the setting nut. The number of elements varies depending on the release torque demanded. If requested, the coupling can be pre-set by the manufacturer. It is also possible to adapt the coupling while in place.
Re-engaging of idle rotation elements
After eliminating the overload driving and driven side are aligned to each other. By means of a plastic hammer or a lever the rotation segments are re-engaged manually while the re-engagement can clearly be heard. Now the overload coupling is ready for operation again.
Typical applications are, as an example, shredders (recycling), mills (steel industry), extruder drives, test bench technology as well as general heavy-duty drives.
To make sure that the torque limiter does not yet release with torque peaks related to the process, the switching torque of the coupling should exceed the maximum operating torque by at least 30 % (see diagramme).
Torque limiters and overload systems which re-engage automatically should only be used with a reduced speed for higher release torques. Frequent or longer slipping or ratching increases the wear of the torque limiter.
After the torque limiter has disconnected driving and driven side in case of overload, it may take some time before the drive comes to standstill because of a high inertia in the drive train. This may cause higher wear on the torque limiter and the overload system re-engaging automatically. That is why we recommend the use of the overload system KTR-SI as an idle rotation type for drives with big inertias or with higher speeds.
We basically recommend electronic monitoring of the torque limiters in order to protect the drive in case of overload.
We will be pleased to support you with technical questions and with the selection of torque limiters. For that purpose we dispose of the latest simulation and calculation programs. Here the following fact applies: The more detailed the data, the more accurate are the calculation results.