US 12,259,025 B2
Method for setting an axial preload force of a roller screw drive of an actuator of a steering device of a motor vehicle
Silvia Kutzberger, Herzogenaurach (DE); Mario Arnold, Aurachtal (DE); and Kathrin Gumbrecht, Herzogenaurach (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 18/016,142
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Apr. 19, 2021, PCT No. PCT/DE2021/100355
§ 371(c)(1), (2) Date May 16, 2023,
PCT Pub. No. WO2022/017553, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 10 2020 119 437.4 (DE), filed on Jul. 23, 2020.
Prior Publication US 2023/0265916 A1, Aug. 24, 2023
Int. Cl. F16H 25/20 (2006.01); B62D 5/04 (2006.01); F16H 25/22 (2006.01)
CPC F16H 25/2006 (2013.01) [F16H 25/2252 (2013.01); B62D 5/0451 (2013.01); F16H 2025/2081 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for setting an axial preload force of a roller screw drive rotatably mounted in a housing via first and second bearings which are axially spaced apart from one another, and a threaded spindle of the roller screw drive is part of a thrust rod penetrating the housing, which is split transversely to the thrust rod into a first housing part and a second housing part, and the first bearing is assigned to the first housing part and the second bearing is assigned to the second housing part, and the first housing part has a first housing edge located transversely to a spindle axis and the second housing part has a second housing edge located transversely to the spindle axis, and the first and second housing edge are configured to rest against one another, and an adjusting nut penetrated by the thrust rod is screwed into the first housing part and is engaged with a bearing supporting surface of the first bearing via an end-side adjusting nut supporting surface of the adjusting nut, the method comprising:
inserting the roller screw drive with the first and second bearings into the second housing part,
applying the axial preload force, which is transmitted from the first bearing via the roller screw drive to the second bearing,
measuring an axial load spacing between the bearing supporting surface of the first bearing and the second housing edge of the second housing part,
screwing the adjusting nut into the first housing part until an axial adjustment spacing between the end-side adjusting nut supporting surface and the first housing edge of the first housing part is equal to the measured axial load spacing,
securing the adjusting nut to the first housing part, and
connecting the first and second housing parts to one another, such that both bear against one another via respective first and second housing edges.