Made with safety in mind
Testing transmissions used in aerospace applications is serious business. Prod
uction engineers need to guarantee performance across a wide range of extreme loading conditions – and failure is not an option.
Recently R+W was involved in developing a coupling system between a drive motor and a production test stand for just this purpose. The combination of heavy loads, high value of the equipment being tested, and uncertainty regarding what can happen in a high-powered testing environment necessitated multiple safety features be built into the best coupling possible for the job.
Technical specifications for the coupling:
In addition to delivering a continuous torque at speed while putting the transmission under test through its paces, this coupling needs to be able to safely disconnect the driveline at an overload torque of 25,000 Nm in case of a component lockup or operator error. The overload safety requirement makes it a perfect fit for the R+W ST-series of safety element torque limiters, designed to disengage with speed and accuracy in the event of an overload and allow for a simple reset after release.
In the interest of easier handling, the coupling is also configured with a drop-out center section. Once the bolts are removed from the outer flanges adjacent to the disc packs, they can be used as draw screws to cause the disc packs to flex inward and disengage the centering pilots for easy removal of the center cartridge without the need to disturb the end hubs.
While this should never happen based on the current application parameters, safety is the top priority in this kind of high stakes testing environment.