Abstract: A transmission member for a worm gear having a thrust ring placed over the shaft of a motor. The worm gear is slip-fit over the shaft and has a coupling head with a pair of projections facing away from the motor. A coupling washer is press-fit onto the motor shaft and has a pair of projections as well, each of which is fitted with an O-ring. The coupling washer is mated to the worm gear so both sets of projections intermesh and form a torque-transmitting arrangement, with the O-rings acting as a buffer between the two sets of projections and allowing the motor shaft to turn relative to the worm for a fraction of a revolution to gain inertia and speed helpful to break loose a jammed gear train.

Abstract: A transmission member for a worm gear having a thrust ring placed over the shaft of a motor. The worm gear is slip-fit over the shaft and has a coupling head with a pair of projections facing away from the motor. A coupling washer is press-fit onto the motor shaft and has a pair of projections as well, each of which is fitted with an O-ring. The coupling washer is mated to the worm gear so both sets of projections intermesh and form a torque-transmitting arrangement, with the O-rings acting as a buffer between the two sets of projections and allowing the motor shaft to turn relative to the worm for a fraction of a revolution to gain inertia and speed helpful to break loose a jammed gear train.

Abstract: A power seat track motor assembly controls motion of a seat in a vehicle. The power seat track motor assembly has a motor that has a first axis of rotation, a gear box having gears that turn in response to rotation of the motor, and a threaded screw that turns in response to turning of the gears in the gear box. The threaded screw has a second axis of rotation that is substantially parallel to the first axis of rotation of the motor so that forces imposed on the screw substantially by-pass the motor and gear box. The assembly also has a threaded structure including a threaded hole through which the threaded screw is threadably inserted. Either the threaded screw or the threaded structure is integral with or mechanically linked to the seat, so that rotation of the threaded screw relative to the threaded hole causes the seat to move. The threaded screw is in compression during normal operation so as to bear the forces that are imposed on the screw to substantially by-pass the motor and gear box.