By means of changing the shapes of the wedges in the backstop, the backstop skids during overload, when the wedges are wedged, wedged angles are enlarged gradually along with increase of torque, and when the wedged angles are larger than friction angles, the wedges can skid on surfaces of the inner ring and the outer ring. When the torque is reduced, the wedged angles are smaller than the friction angles, and the backstop realizes normal backstop. When overload impact force is reduced, the backstop can normally operate again. Use safety of equipment is greatly increased.

Centers of the wedges are coincident to fixed centers thereof by means of calculation, so that the backstop is more stable in operation, and the service life of the backstop is prolonged.
In one word, the purpose of a backstop is to prevent undesirable reverse rotation. During operation, the backstop permits rotation in only one specified direction of rotation.

The backstop functions by using centrifugal lift-off sprags. Once the lift-off speed is reached, the sprags lift off from the contact surface of the outer ring completely. The backstop is lubricated with the gear unit oil.

Direction of Rotation

FLK Drive installs backstops according to the specifications given with the order. This means that it is necessary to specify the direction of rotation for the output shaft. The customer must check that the connected electric motor rotates in the correct direction. If not, the electric motor may damage the backstop.
The direction of rotation is determined with a view to the output shaft(LSS).

CW = Clockwise
CCW = Counterclockwise(anti-clockwise)