Cooled ball screw

The utility model provides a cooled ball screw, mainly by a screw rod, a nut, at least two sealed lids, and two at least sealing ring spares are constituteed, the groove is established with concave atleast two appearances of establishing of second terminal surface to first terminal surface through the nut, and seal up to cover to correspond respectively to set up with at least two and establish the groove in this at least two appearance, and the anti -leakage mat piece that does not need prior art is located between sealed lid and the nut dog, and reduce axial compression thickness, the holding annular of locating this at least two sealed lids is overlapped respectively with two at least sealing ring spares, shorten nut length, also therefore relatively reduce dog thickness and cost. In addition, work as the utility model discloses when using the double nut, promote the packaging efficiency and provide the equipment convenient efficiency, reduce the oil plug screw in winding stoppingleak area, reduce the poss