Uni-directional Roller Clutch A. Unlock B. Lock 1 Roller 2 Cage 3 Spring 4 Inner race 5 Stator The roller clutch used on the stator uses ten parallel rollers, located between the smooth, cylindrical inner race and the inclined cam faces of the stator body. Springs are used to hold the rollers in position between the two contact faces. When the stator is rotated in a clockwise direction, the rollers become trapped between the inner race and the inclined cam faces of the stator body, providing positive (locked) rotation of the inner race. When the stator is rotated in an anticlockwise direction, the rollers are moved away from the inclined cam faces and can rotate freely (unlocked) with the stator body, providing no drive from the stator to the inner race. In this condition the stator can rotate freely on the inner race.