What is a safety coupling?

In drive technology, the safety coupling is a machine element that reliably transmits torques and limits them to a defined value.
Synonyms for safety clutches are overload clutches and disengaging clutches, in technical circles the term torque limiter is often used.
In addition to torque-limiting couplings, there are also force-limiting overload couplings on the market.
The term safety coupling is also used in fluid power engineering. Hydraulics engineers, pneumatics engineers, etc. understand this to mean couplings for the safe connection of hose lines.

Where are safety couplings used and for what?

Safety couplings separate the input and output of a driveline from each other in the event of an overload, thus protecting the components from damage.

Uncontrolled and excessive torques usually lead to damage in the drive train, and in the worst case even to machine downtime. Production interruptions in high-quality plants and long machine downtimes after collisions, as well as high spare parts costs, can be prevented with safety couplings, which is especially important in our time of "just-in-time". Safety couplings are used to prevent machine downtime due to damage; in the event of an overload, the input and output of a drive train are separated from each other within milliseconds. In order for the torque limiting clutch to know when an overload condition occurs, a specific torque value is defined at which the clutch triggers disengagement. This value is referred to as the disengagement torque.
Safety couplings are also referred to as overload clutches or torque limiters.