US 11,717,918 B2
Screw element of a ball screw mechanism
Yannick Vanco, Strasbourg (FR); Thierry Leobold, Woerth (FR); Dieter Eckert, Fürth (DE); Stefan Grimm, Forchheim (DE); and Daniel Hell, Pfaffenhoffen (FR)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 16/626,161
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed May 3, 2018, PCT No. PCT/DE2018/100421
§ 371(c)(1), (2) Date Dec. 23, 2019,
PCT Pub. No. WO2019/001612, PCT Pub. Date Jan. 3, 2019.
Claims priority of application No. 10 2017 114 171.5 (DE), filed on Jun. 27, 2017.
Prior Publication US 2020/0171608 A1, Jun. 4, 2020
Int. Cl. B23K 33/00 (2006.01); B23K 20/12 (2006.01); B23K 35/30 (2006.01); F16H 25/24 (2006.01)
CPC B23K 33/006 (2013.01) [B23K 20/12 (2013.01); B23K 35/3053 (2013.01); F16H 25/24 (2013.01); F16H 2025/249 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A screw element of a ball screw mechanism, comprising a lead screw, which is joined at an axial end to a rod element, wherein:
a first end face of the lead screw and a second end face of the rod element are integrally bonded to each other by a friction welding process, and
the lead screw prior to performing the friction welding process has an annular groove extending circumferentially on the first end face, a radial outer-most extent of the annular groove arranged radially inwardly of an outer surface of the first end face of the lead screw, and
the rod element has an outer-most diameter at its second end face facing toward the lead screw which is less than or equal to an inner diameter of the annular groove, the inner diameter defined by a radial inner-most extent of the annular groove.