# US 11,993,322 B2 · Electromechanical motor vehicle steering system comprising housing parts that are interconnected by means of tapered interference fit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,993,322 B2 - Document ID: US11993322B2 - Status: Granted - Kind: B2 - Application number: 15/733,930 - Filed: 2019-06-04 - Published: 2021-05-06 - Granted: 2024-05-28 - Earliest claimed: 2018-06-05 - Assignees: Thyssenkrupp Presta AG; thyssenkrupp AG - Applicants: thyssenkrupp Presta AG; thyssenkrupp AG - Inventors: Katrin Blank; Dominik Schweitzer - Web page: https://patentgrep.com/patent/US11993322B2 ## CPC - B62D 5/0403: {characterised by constructional features, e.g. common housing for motor and gear box} - H02K 5/04: Casings or enclosures characterised by the shape, form or construction thereof - H02K 5/10: with arrangements for protection from ingress, e.g. water or fingers - H02K 11/33: Drive circuits, e.g. power electronics (H02K11/38 takes precedence) - H02K 15/14: Casings; Enclosures; Supports - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract An electromechanical motor vehicle steering system includes an electric motor and an electronic control unit. The electromechanical motor vehicle steering system is at least partially surrounded by housing parts. At least two of the housing parts are connected to one another by interference fit, wherein the interference fit is at least partly a tapered interference fit. ## Claims ### Claim 1 An electromechanical motor vehicle steering system, comprising: an electric motor, an electronic control unit, and housing parts at least partially surrounding the electromechanical motor vehicle steering system, wherein at least two of the housing parts are connected to one another by interference fit, wherein the interference fit is at least partly a tapered interference fit, and wherein an internal part of the housing parts connected by means of the interference fit has a peripheral shoulder which delimits the joining distance. ### Claim 2 (depends on 1) The electromechanical motor vehicle steering system of claim 1 wherein the tapered interference fit is formed by two corresponding tapered joining surfaces which form a setting angle. ### Claim 3 (depends on 2) The electromechanical motor vehicle steering system of claim 2 wherein the setting angle ranges from 0.5°-5°. ### Claim 4 (depends on 1) The electromechanical motor vehicle steering system of claim 1 wherein the interference fit has an oversize. ### Claim 5 (depends on 1) The electromechanical motor vehicle steering system of claim 1 wherein a motor housing surrounding the electric motor is connected to at least one of the housing parts surrounding the electronic control unit by means of the interference fit. ### Claim 6 An electromechanical motor vehicle steering system, comprising: an electric motor, an electronic control unit, and housing parts at least partially surrounding the electromechanical motor vehicle steering system, wherein at least two of the housing parts are connected to one another by interference fit, wherein the interference fit is at least partly a tapered interference fit, and wherein in a longitudinal direction the interference fit is a combination of a cylindrical interference fit and a tapered interference fit, and wherein an annular groove with an inserted O-ring is provided in the region of the interference fit for sealing between the housing parts. ### Claim 7 A method for connecting housing parts of an electromechanical motor vehicle steering system comprising an electric motor and an electronic control unit, comprising: providing an internal housing part and an external housing part, wherein the external housing part has an opening with an at least partially tapered internal surface, and wherein the internal housing part has a corresponding taper with a tapered seat surface, wherein the corresponding tapered surfaces form a setting angle; and positioning the external housing part on the internal housing part and pressing the external housing part onto the internal housing part with a defined axial joining force, and wherein the internal housing part has a peripheral shoulder which delimits a joining distance. ### Claim 8 (depends on 7) The method of claim 7 wherein the setting angle ranges from about 0.5°-5°. ### Claim 9 (depends on 7) The method of claim 7 wherein a fit of the internal housing part to the external housing part is an interference fit with an oversize. ### Claim 10 (depends on 9) The method of claim 9 wherein the interference fit is exclusively a tapered interference fit and the joining distance comprises a joining distance without force and a push-on distance, wherein the joining distance without force is greater than the push-on distance. ### Claim 11 (depends on 7) The method of claim 7 wherein the external housing part and the internal housing part is respectively a motor housing surrounding the electric motor and a housing part surrounding the electronic control unit.