Belt-Driven Rack Gear Power Sliding Door

A power door drive system is provided for moving a sliding side door on a vehicle body having an aperture between an open position substantially clear of the aperture and a closed position substantially covering the aperture. A guide track having channel and rack portions is mounted to the vehicle body adjacent the aperture. The rack portion includes a plurality of rack teeth. A hinge member is adapted for mounting to the side door and includes a plurality of guide rollers for rollingly engaging the channel portion of the guide track. A power drive mechanism mounted to the hinge member includes a reversible motor for producing a drive torque, a pinion gear having a plurality of drive teeth meshingly engaging the rack teeth, and an endless belt for transferring the drive torque from the motor to the pinion gear thereby driving the sliding door between the open and closed positions.