Patent ID: 6966864

Claim:
A transfer case comprising: an input shaft; first and second output shafts; an interaxle differential having an input member, a first output member coupled to said first output shaft, a second output member coupled to said second output shaft, and a gearset interconnecting said input member to said first and second output members; a range unit having an output component driven at a reduced speed relative to said input shaft; a range clutch operable in a high-range mode to couple said input member of said interaxle differential for rotation with said input shaft and in a low-range mode to couple said input member of said interaxle differential for rotation with said output component of said range unit; a mode clutch operable in a released mode to permit unrestricted speed differentiation between said first and second output members of said interaxle differential and in a locked mode to prevent speed differentiation therebetween; and a power-operated actuation mechanism including a motor, a drive shaft driven by said motor, a first cam mechanism driven by said drive shaft for shifting said range clutch between its high-range and low-range mode in response to rotation of said drive shaft through a first amount of rotary travel, a second cam mechanism for shifting said mode clutch between its released and locked modes in response to rotation of said drive shaft through a second amount of rotary travel, and a rotary drive mechanism connecting said second cam mechanism to said drive shaft, said second cam mechanism including a first cam member, a second cam member having a gear segment and rollers engaging a cam surface formed on at least one of said first and second cam members, and said rotary drive mechanism including a gearset driven by said drive shaft and meshed with said gear segment of said second cam member.