Drive unit and rack and pinion operating system thereof

The utility model discloses a drive unit and rack and pinion operating system thereof. Drive unit includes speed reducer and output pinion, and the speed reducer includes the output shaft, and the output shaft includes: first output shaft, second output shaft and third output shaft, output pinion cover establish on second output shaft and second output shaft threaded connection, first output shaft is connected with second output shaft's one end, the 3rd output shaft of second output shaft overlaps on the first output shaft and is equipped with a resilient means, overlaps on the third output shaft to be equipped with the 2nd resilient means. Rack and pinion operating system includes four at least drive unit. The utility model discloses a screw thread converts the rotary motion of output pinion along the axial motion of output shaft into, has solved output pinion non-synchronous phenomenon, the embodiment of the utility model provides a rack and pinion operating system under the condition of the lift principle that does not change traditional elevating gear, has only carried out optimizing the innovation to the speed reducer part, has reduced manufacturing cost.