On-demand transfer case with controllable bi-directional overrunning clutch assembly

A transfer case comprising:

• an input shaft;
• a reduction unit driven by said input shaft and having an output member driven at a reduced speed relative to said input shaft;
• a first output shaft,
• a second output shaft;
• a range actuator moveable between a first position and a second position to establish corresponding drive connections between said first output shaft and each of said input shaft and said output member;
• a bi-directional overrunning mode clutch including a first ring driven by said first output shaft, a second ring and having an actuation slot with first and second edge surfaces, rollers disposed in aligned cam tracks formed in facing surfaces of said first and second rings, said second ring adapted to circumferentially index relative to said first ring to cause said rollers to ride up said cam tracks and cause said second ring to frictionally engage said second output shaft, and a mode actuator having a lug extending into said actuation slot and which is circumferentially indexed relative to said second ring between a first mode position and a second mode position to establish corresponding AUTO and LOCK modes, said lug engages one of said first and second edge surfaces of said actuation slot when said mode actuator is located in its first mode position and said lug is released from engagement with both of said first and second edge surfaces of said actuation slot when said mode actuator is located in its second mode position, said overrunning clutch is operable in its AUTO mode to permit relative rotation between said first and second output shafts in a first direction and prevent relative rotation therebetween in a second direction, and said overrunning clutch is operable in its LOCK mode to prevent relative rotation between said first and second output shafts in both directions;
• and
• a shift mechanism for controlling movement of said range actuator and said mode actuator.