Working Principle

Inside the backstop, multiple special-shaped blocks are distributed in the raceway formed by the inner and outer rings.When the inner ring rotates in the forward direction, it drives the special-shaped blocks to rotate together.

When the speed exceeds the non-contact speed, the special-shaped blocks will disengage from the inner and outer rings under the action of centrifugal force, thus achieving wear-free operation.

When the inner ring rotates reversely, under the action of springs, the special-shaped blocks contact with the inner and outer rings and wedge them into one body, bearing the reverse torque transmitted from the inner ring.