Ball screw drive
A ball screw having a spindle nut ( 21 ), a threaded spindle, and a retaining element ( 23 ) is provided. The retaining element ( 23 ) is connected in a form-fitting, play-free manner to the threaded nut ( 21 ) by a projection ( 24 ) which fits around the outside of the threaded nut ( 21 ) in an end region. The threaded nut ( 21 ) and the retaining element ( 23 ) functioning as a force transmission member are first positioned precisely during manufacture and then connected by a form-fitting, in particular play-free connection, in particular by caulking, crimping, clinching or other deformation processes.
1. A method for producing a ball screw which has a threaded spindle, a threaded nut, and a retaining element, the method comprising:
first positioning the threaded nut and the retaining element which functions as a force transmission member together precisely during manufacture without deformation of the threaded nut or the retaining element by axially pushing the retaining element into a defined fit position on the spindle nut body against a stop region in which an axial end of the threaded nut contacts a surface of the retaining element and a projecting region of the retaining element that fits over the end of the threaded nut extends axially beyond the stop region, and
then connecting said retaining element by a form-fitting connection via a radial application of force at least in some sections of the projecting region axially spaced from the stop region to at least one of caulk, crimp, clinch, or deform material of the projecting region onto the threaded nut without affecting a position of the stop region.
2. The method according to claim 1 , wherein, during production of the form-fitting connection between the threaded nut and the retaining element, material of the retaining element is pressed into a filling region on the threaded nut.
3. The method according to claim 1 , wherein the form-fitting connection of the retaining element to the spindle nut is supported by at least one of a roughening, knurling or other surface treatment or a surface coating in the filling region.
4. The method for producing a ball screw according to claim 1 , wherein the spindle nut includes a peripheral groove on an outside thereof axially spaced from the stop region, and the method further comprises connecting said retaining element by the at least one of caulking, crimping, clinching, or deforming the material of the retaining element into the peripheral groove.