Ball screw and nut drive device

Ball spindle and nut drive device comprising an axially extending spindle having a circumferentially extending outside surface, an axially extending nut body laterally enclosing at least a portion of the axially extending outside surface of said spindle, said nut body having an axially and circumferentially extending inside surface spaced outwardly from the outside surface of said spindle and an axially extending outside surface spaced outwardly from said inside surface, said nut body having an end face at each of the opposite ends thereof extending transversely of the axial direction of said nut body, the inside surface of said nut body having a helically extending groove therein, the outer surface of said spindle in combination with the helically extending groove in the inside surface of said nut body forming a helical ball channel, a plurality of balls for circulation through said helical ball channel, said nut body having an axially extending ball return channel speed outwardly from the inside surface of said nut body for passing said balls between the opposite ends of said helical ball channel, said nut body having a first recess extending axially from each of said end faces and formed in the inside surface of said nut body and each said first recess extending in the axial direction from said end face to at least the region of said helically extending groove with said first recess being open through said inside surface of said nut body, said first recess having a first surface, a deflecting member inserted into said first recess, said deflecting member having a deflecting channel therein and a deflecting projection extending from said deflecting channel tangentially into said helical ball channel for lifting said balls circulating through said ball channel into said deflecting channel, said deflecting channel having a rectilinear portion extending tangentially of said ball channel and a curvilinear portion at the end of said rectilinear portion spaced outwardly from said ball channel with said curvilinear portion extending into said ball return channel, wherein the improvement comprises that said deflecting channel being open for a portion of the circumferential surface along the length thereof on the side of said deflecting channel opposite said projection, and in the open portion of said deflecting channel said balls moving therethrough contact the first surface of said first recess, the first surface of said first recess being located in a plane parallel with the axis of said nut body and the first surface extending tangentially of and outwardly from the base of said helically extending groove in said nut body.