Modified lead screw subassembly

The utility model belongs to the technical field of the lead screw technique and specifically relates to a modified lead screw subassembly, offering the nut retaining ring of bayonet socket, lead screw, stroke position sleeve, offering the drive nut of at least one draw -in groove and place the inclined plane bayonet lock and the pressure spring of drive nut draw -in groove in along the axial on the outer wall including the one end of outer tube, nearly nut, the stroke position sleeve is installed at the lead screw both ends, and the drive nut cover is established and is being lain in two lead screws between the stroke position sleeve, and the two nuts retaining ring is during with the drive nut centre gripping and inlay the intraductal one end of establishing at the outer tube, its characterized in that: the outer wall at the nearly middle part of nut retaining ring set up a recess along the circumference, with the recess correspond on the pipe wall of the outer tube of position department with the recess es