Patent ID: 7634952

Claim:
A rotating nut ball screw unit with lubrication arrangement comprising: a screw bolt with an outer threaded surface; a rotating nut unit comprising a nut, several split bearings and a bearing shell, wherein said nut is hollow and encircling said screw bolt, the inner surface of said nut is provided with an inner spiral groove corresponding to the outer threaded surface of said screw bolt, said bearings are disposed to support said nut and enclosed by said bearing shell, said nut is rotated against said bearing shell with said split bearings intercalated therebetween; a plurality of balls interposed between the outer threaded surface of said screw bolt and the inner spiral groove of said nut; an oil storage in connection with an oil outlet for supplying lubricating oil; and a lubrication device comprising a main body, a collar and a bearing; wherein said main body has several oil holes and is fixed to an end surface of said nut, said collar necks around said main body with said bearing intercalated therebetween so as to allow said main body able to rotate relatively with respect to said collar thereby conducting the lubricant from said oil storage into an oil reserving space formed among said main body, said collar and said bearing, said oil reserving space is communicated with said oil holes so that the lubricating oil can reach the surface of said screw bolt via said oil holes.