Abstract: A sliding-door drive unit for a vehicle is capable of transferring or blocking drive power required to pull or push a cable to open or close a sliding door. The sliding-door drive unit includes a worm wheel rotatable by a drive motor, a stationary disc coupled to an output shaft, and a movable disc rotatably installed between the worm wheel and the stationary disc along an axial direction of the output shaft. The movable disc is engaged with the worm wheel and is selectively engaged with the stationary disc.

Abstract: A sliding-door drive unit for a vehicle is capable of transferring or blocking drive power required to pull or push a cable to open or close a sliding door. The sliding-door drive unit includes a worm wheel rotatable by a drive motor, a stationary disc coupled to an output shaft, and a movable disc rotatably installed between the worm wheel and the stationary disc along an axial direction of the output shaft. The movable disc is engaged with the worm wheel and is selectively engaged with the stationary disc.

Abstract: A sliding-door drum assembly capable of being assembled in a facilitative manner by enabling a cable to be elastically supported and to maintain an appropriate tensile force after being assembled is proposed. The sliding-door drum assembly includes: a cable pulling a sliding door rotatably installed on a vehicle to slide the sliding door; and a drum around which the cable is wound; a drum adapter connected to an output shaft of a drive unit. The drum is installed on the drum adapter. Additionally, the sliding-door drum assembly may include an elastic member elastically supporting the drum against the drum adapter.