Integrated Freewheels FXR … for bolting to the face with sprag lift-off X, torque limiting and optional reverse running function Application as ➧ Backstop for continuous conveyor installations with multiple drives in which each drive is equipped with a backstop. Reduction gear Head pulley Backstop with torque limiting (optional with reverse running function) Backstop with torque limiting (optional with reverse running function) Integrated Freewheels FXR … are sprag freewheels without bearing support and with sprag lift-off X. They consist of the Integrated Freewheels FXM (refer to pages 66 to 71) with additional torque limiter. For reversing operation, they can be optionally equipped with a reverse running function. This allows the conveyor belt to run backwards, for example during maintenance work. The sprag lift-off X ensures a wear-free freewheeling operation when the inner ring rotates at high speed. In continuous conveyor installations with multiple drives it is important to consider the problem of the unequal distribution of backdriving torque to the individual drives and backstops. As soon as the installation comes to a standstill, the entire backdriving torque is applied primarily to a single backstop, due to differences in the play and elasticity of the drives involved. In installations equipped with backstops without torque limiters, the individual gearboxes and the corresponding backstops must be designed to accommodate the entire backdriving torque of the conveyor installation in order to ensure safety. The problem of the unequal distribution of backdriving torque is solved by using backstops FXR … with torque limiting. The torque limiter which is built into the backstop slips temporarily when the specified torque is exceeded until the other backstops engage in succession. In this way, the entire backdriving torque of the conveyor installation is distributed to the individual gearboxes and backstops. Furthermore, dynamic peak torques which occur during the locking process are reduced, thereby protecting the gearboxes against damaging peak torques. For this reason the use of backstops FXR … with torque limiting in continuous conveyor installations with multiple drives enables the application of gearboxes with smaller dimensions. Advantages Conveyor belt Drive layout of an inclined conveyor with dual drives 74-2 • Protection of gearboxes from overload by unequal load distribution in multiple drives • Protection of gearboxes from dynamic peak torques during the locking process • Smaller gearboxes can be used without negatively effecting the safety • Protection of the backstops, as dynamic peak torques are reduced by tempo

Integrated Freewheels FXR … for bolting to the face with sprag lift-off X, torque limiting and optional reverse running function Integrated Freewheels FXRW with torque limiting and without release function Integrated Freewheels FXRU with torque limiting and with release function This series of backstops with torque limiting is the basic version. The design and the available standard sizes are shown on page 76. This series is designed in the same way as series FXRW; as an addition, a finely controllable release function is built in. The design, the description of the release function and the available...

Type with sprag lift-off X For extended service life using sprag lift-off at high speed rotating inner ring Keyway according to DIN 6885, page 1 • Tolerance of keyway width JS10. * Keyway according to DIN 6885, page 3 • Tolerance of keyway width JS10. ** Z = Number of fastening holes for screws G (DIN EN ISO 4762) on pitch circle T. *** Area for O-ring sealing. Other freewheel sizes upon request. The Integrated Freewheels FXRU are supplied with a set slipping torque Mr of the torque limiter. The static backdriving torque Ml of the installation (also in the case of an overload) must under no circumstances...