EP4186146A1 - Gehäuse für einen elektromotor einer elektrischen hilfskraftlenkung für ein kraftfahrzeug - Google Patents
Gehäuse für einen elektromotor einer elektrischen hilfskraftlenkung für ein kraftfahrzeugInfo
- Publication number
- EP4186146A1 EP4186146A1 EP21743162.6A EP21743162A EP4186146A1 EP 4186146 A1 EP4186146 A1 EP 4186146A1 EP 21743162 A EP21743162 A EP 21743162A EP 4186146 A1 EP4186146 A1 EP 4186146A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- housing according
- electric motor
- hollow cylinder
- transverse wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/14—Casings; Enclosures; Supports
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Definitions
- the invention relates to a housing for an electric motor, comprising a first element with a hollow cylinder and a second element, the second element being connected to the first element by material bonding. Furthermore, the invention relates to a servomotor for a steering system and a steering system for a motor vehicle.
- An electromechanical steering system in particular a steer-by-wire steering system, for motor vehicles includes at least one electric motor for power steering, which can also be referred to as a servomotor.
- a servomotor Such an electric motor is set up to apply an auxiliary torque to a component of the steering system provided for this purpose or to introduce an auxiliary torque into a component of the steering system provided for this purpose.
- the auxiliary torque serves to support the driver of the motor vehicle in steering the motor vehicle or to facilitate the steering of the motor vehicle.
- the magnitude and the direction of the auxiliary torque are determined situationally by a control unit on the basis of data recorded by sensors, in particular rotation angle and torque sensor data, and transmitted to the electric motor.
- the fastening element has means for positioning, in particular for centering to ensure correct relative positioning of the components to be welded.
- the means for positioning are positive-locking elements, which are designed to be complementary in shape to the geometry or parts of the geometry of the element to be welded to the fastening element.
- the fastening element and/or the element to be welded to the fastening element therefore have a high geometric complexity. This requires additional effort in the development and in the production of the fastening element and/or the element to be welded to the fastening element, so that their production costs are comparatively high.
- every electromechanical steering system for motor vehicles includes at least one electric motor and motor vehicles are mass-produced, the costs for producing a mechanical connection between the electric motor and a support structure must not exceed a certain limit.
- the object of the present invention is to create a permanent, reliable, easy-to-manufacture and cost-efficient connection between the electric motor and a supporting structure.
- a housing for an electric motor comprising a first element with a hollow cylinder and a second element, the second element being connected to the first element by material bonding, characterized in that at least the first element or the second element is in a state , that is, the first element and/or the second element, has at least one welding projection for connecting the first element to the second element by resistance projection welding before the material-locking joining.
- the housing according to the invention comprises two elements which are connected to one another by means of material bonding. At least one of these two elements has at least one welding projection in a state before the material-to-material joining.
- a sweat hump is a geometry impressed into a workpiece or component to be welded, in particular by a forming process. The weld projection enables the first element and the second element to be joined together by resistance projection welding.
- resistance projection welding which is a resistance pressure welding process
- flat and large-area electrodes are used on the one hand to supply electricity and on the other to apply force.
- the weld projections stamped into the workpiece to be welded form a geometry that promotes the high, local current density or concentration required for resistance projection welding.
- the components to be welded are pressed together by the electrodes using a defined contact pressure or electrode force and a defined welding current.
- the weld projections deform and heat up so that the components to be welded are finally bonded to one another at the points of the weld projection.
- the geometry of the weld projection defines the areas of current transfer between the components to be welded and thus the areas of the material connection, since the components to be welded only come into mechanical contact at the points of the weld projection.
- the two elements forming the case according to the invention do not have means for relative positioning between the first element and the second element.
- the relative positioning can be done by a corresponding assembly system, in which the first element and the second element are inserted before welding. This firstly simplifies the making of the connection between the first element and the second element and secondly reduces the geometric complexity of the two elements.
- the first element is set up to enclose components, in particular electronic components, of the electric motor, in particular the stator and/or the rotor of the electric motor.
- the second element acts as an adapter or connection piece for mechanically connecting the first element to a support structure, in particular to the steering gear of the steering system, or for mechanically connecting the first element to a gear, in particular a worm gear, which in turn is advantageously connected to the steering gear of the steering system is.
- the second element can have a flat or planar or flat plate and can be designed essentially in the shape of a ring, in particular in the shape of a circular ring.
- the first element advantageously has a transverse wall connected to the hollow cylinder. The bulkhead improves the spatial rigidity of the first element.
- the second element is connected to the transverse wall of the first element.
- the second element can be arranged lying flat on the transverse wall of the first element.
- the transverse wall of the first element makes it possible to create the welded connection between the first element and the second element over a comparatively large area.
- the welded connection is not limited to the cross-sectional area of the hollow cylinder of the first element.
- the transverse wall has the at least one welding projection in a state before the materially bonded joining.
- the at least one welding projection is embossed in the transverse wall of the first element. This enables easy implementation of resistance projection welding.
- the transverse wall is connected to the hollow cylinder at an axial end of the hollow cylinder.
- the transverse wall can be designed as an end wall.
- the transverse wall is formed in one piece with the hollow cylinder of the first element.
- the first element can be produced by deep-drawing.
- the shaft can be arranged coaxially to the hollow cylinder of the first element.
- the first element is preferably a sheet metal part.
- the first element can be produced simply and inexpensively and can easily be used by resistance projection welding.
- the first element, which is designed as a sheet metal part can be obtained by deep-drawing.
- the sheet metal part can thus be produced particularly easily and inexpensively and can be used particularly easily by means of resistance projection welding.
- the second element has a central or central recess or opening for the passage of a shaft of the electric motor.
- the shaft can be arranged coaxially to the hollow cylinder of the first element.
- the recess can be dimensioned larger than the recess of the second element. Exact positioning or centering of the first element relative to the second element is not ensured by a corresponding means for positioning the second element, but is carried out by a corresponding assembly system during welding.
- the second element does not have a raised edge that encloses the first element on the peripheral side. This simplifies the geometric complexity of the second element.
- the second element can be a sheet metal part.
- the second element can be produced easily and inexpensively and is easy to use by means of resistance projection welding.
- the second element, designed as a sheet metal part can be obtained by deep-drawing.
- the sheet metal part can thus be produced particularly easily and inexpensively and can be used particularly easily by means of resistance projection welding.
- the second element has at least one integral part or tab, which extends radially outward, for fastening the housing to a supporting structure.
- the at least one projection is comparatively easy to produce, in particular when the second element is a sheet metal part, and simplifies resistance projection welding.
- the molding can have a recess, preferably a bore, for the passage of a fastening means.
- the recess can have an internal thread.
- a screw for example, can be passed through the recess in order to connect the housing to a supporting structure.
- the hollow cylinder can be designed as a housing pot or bowl.
- a housing set for producing a housing described above is also proposed.
- the housing set includes a first element with a hollow cylinder and a second element.
- the first element and/or the second element have weld projections, which are arranged in such a way that the first element can be connected to the second element by material joining at the weld projections.
- the features of the first element of the housing set advantageously correspond, alone or in combination, to the features of the first element according to the configurations of the housing described above.
- the features of the second element of the housing set advantageously correspond, alone or in combination, to the features of the second element according to the configurations of the housing described above.
- the first element has a transverse wall connected to the hollow cylinder, the second element preferably being connected to the transverse wall of the first element in order to produce the housing.
- the transverse wall advantageously has the at least one welding projection. It is further provided in particular that the transverse wall is connected to the hollow cylinder at an axial end of the hollow cylinder.
- the transverse wall is also advantageously formed in one piece with the hollow cylinder. Further advantageously, the transverse wall has a central recess for the passage of a shaft of an electric motor.
- the first element and/or the second element is a sheet metal part, the sheet metal part advantageously being obtainable by deep-drawing.
- the second element has a central recess for the passage of a shaft of an electric motor.
- the second element has at least one integral part that extends radially outward.
- the molding is advantageously designed for arranging the housing to be produced from the housing set.
- the molding has a recess for the passage of a fastener, the passage advantageously having an internal thread.
- the hollow cylinder is designed as a housing pot.
- a servo motor for a steering system in particular for an electric power steering system for a motor vehicle, with a housing according to the invention is proposed.
- a steering system for a motor vehicle in particular an electric power steering system for a motor vehicle, with a servo motor according to the invention is proposed.
- FIG. 1 shows an exemplary embodiment of a power steering system designed according to the invention for a motor vehicle in a schematic perspective representation
- FIG. 2 shows an exemplary embodiment of a servo motor of a power steering system designed according to the invention
- FIG. 3 shows an exemplary embodiment of a housing set designed according to the invention for the production of a housing designed according to the invention in a perspective view
- FIG. 4 shows the housing set for producing a housing from FIG. 3 in a further perspective view
- FIG. 5 shows an exemplary embodiment of a housing designed according to the invention in a sectional view with the housing set from FIG.
- Figure 1 shows an embodiment of a power steering system 1, which is attached to a steering shaft 2, which is rotatably mounted about its longitudinal axis L, the steering shaft axis.
- the steering shaft 2 has an inner shaft 21 which is arranged in an outer shaft 22 in a torque-locking manner and is telescopically adjustable in the longitudinal direction.
- the steering shaft 2 has a fastening section 23 for attaching a steering wheel, not shown.
- An electric power-assisted drive 3 has a gear 31, preferably a worm gear, whose output gear is coupled in particular in a torque-proof manner to the steering shaft 2, in particular to the inner shaft 21.
- a drive unit 4 is attached to the transmission 31 on the input side.
- the drive unit is a servomotor 4 designed according to the invention.
- FIG. 2 an advantageous embodiment for the drive unit 4 is shown separately in the dismantled state.
- the drive unit 4 has an electric motor 41 .
- the electric motor 41 has a housing 5, in particular a stator housing, in which a rotor shaft 42 is rotatably mounted about a rotor axis R.
- the rotor axis R defines the axial direction of the drive unit 4.
- a clutch 43 is attached to the rotor shaft 42 on the transmission side, which is designed as a claw clutch in this exemplary embodiment.
- a control housing 7 is arranged on the stator housing 5 and projects transversely to the rotor axis R over the cross section of the stator housing 5 .
- control circuit board is advantageously arranged, also as a Circuit board or PCB (printed circuit board) referred to, on which in particular a control circuit is constructed and interconnected with electronic components not specified at this point.
- PCB printed circuit board
- FIG. 3 shows a housing set for producing a housing, in particular for producing a stator housing 5 shown in FIG. 2 for an electric motor, not shown in FIG. 3, in a perspective representation.
- the housing set for producing the stator housing 5 comprises a first element 10 and a second element 20, the first element 10 comprising a hollow cylinder 30.
- the first element 10 is set up to accommodate and enclose an electric motor, in particular an electric unit, in particular to protect the electric motor from any interference.
- the electric motor can be pushed in the axial direction along the rotor axis R through an opening 50 of the first element 10 facing away from the second element 20 .
- the second element 20 can be connected to the first element 10 by resistance projection welding.
- the second element 20 has four weld projections 6, which deform during the resistance projection welding due to the contact pressure applied and the welding current introduced, heat up and ultimately form a local weld between the first element 10 and the second element 20.
- FIG. 3 shows a state before the integral joining, in which the first element 10 and the second element 20 are present as separate components.
- the assembly direction 70 shown as an arrow indicates the arrangement of the second element 20 on the first element 10 and the direction of the contact pressure during the resistance projection welding.
- the first element 10 has a transverse wall 8 designed as an end wall.
- the transverse wall 8 is formed in one piece with the hollow cylinder 30 .
- the first element 10 is designed as a housing pot.
- the second element 20 can be arranged or laid flat on the transverse wall 8 of the first element 10 and then connected by resistance projection welding.
- Both the first element 10 and the second element 20 are each a sheet metal part that can be obtained by deep drawing.
- the transverse wall 8 of the first element 10 has a central recess 90 for the passage of a shaft of the electric motor.
- the second Element 20 also has a central recess 100 for the passage of a rotor shaft 42 of an electric motor 41 .
- the second element 20 has two projections 11 extending radially outwards for fastening the finished housing 5 to a supporting structure, not shown in FIG.
- the two projections 11 are arranged opposite one another in the circumferential direction of the recess 100 of the second element 20 .
- the two projections 11 each have a recess 12 designed as a bore for the passage of a fastening means.
- the projections 11 can be stiffened, in particular between the weld projections 6 and the recess 12.
- the stiffening can be introduced in particular by a material forming process, in particular by stamping or embossing.
- FIG. 4 shows the housing set for manufacturing a housing 5 from FIG. 3 in a further perspective view.
- An electric motor not shown in FIGS. 3 and 4, can be inserted through the opening 50 of the first element 10 into the cylindrical space inside the first element 10, so that the electric motor is advantageously protected.
- FIG. 5 shows a sectional view of a housing produced from the housing set according to FIG.
- the sectional plane leads through the two recesses 12 of the second element 20.
- neither the first element 10 nor the second element 20 have means for positioning the two elements 10, 20 relative to one another.
- the relative positioning between the first element 10 and the second element 20 is carried out by a corresponding assembly system, in which the first element 10 and the second element 20 are inserted before welding.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020209305.9A DE102020209305A1 (de) | 2020-07-23 | 2020-07-23 | Gehäuse für einen Elektromotor einer elektrischen Hilfskraftlenkung für ein Kraftfahrzeug |
| PCT/EP2021/069104 WO2022017825A1 (de) | 2020-07-23 | 2021-07-09 | Gehäuse für einen elektromotor einer elektrischen hilfskraftlenkung für ein kraftfahrzeug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4186146A1 true EP4186146A1 (de) | 2023-05-31 |
Family
ID=76971900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21743162.6A Pending EP4186146A1 (de) | 2020-07-23 | 2021-07-09 | Gehäuse für einen elektromotor einer elektrischen hilfskraftlenkung für ein kraftfahrzeug |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4186146A1 (de) |
| DE (1) | DE102020209305A1 (de) |
| WO (1) | WO2022017825A1 (de) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5621260A (en) * | 1992-10-07 | 1997-04-15 | Matsushita Electric Industrial Co., Ltd. | Coreless motor |
| DE102006048526A1 (de) | 2006-10-13 | 2008-04-17 | Zf Lenksysteme Gmbh | Elektromotor zur Servounterstützung eines Lenksystems |
| DE102013201715A1 (de) * | 2012-08-28 | 2014-03-06 | Robert Bosch Gmbh | Elektrische Maschine zum motorischen Verstellen beweglicher Teile im Kraftfahrzeug, sowie Verfahren zum Herstellen der elektrischen Maschine |
| DE102015207548A1 (de) | 2015-04-24 | 2016-10-27 | Robert Bosch Gmbh | Motorgehäuse für einen Elektromotor, insbesondere für einen elektrischen Lenkmotor |
| DE102016224265A1 (de) | 2016-12-06 | 2018-06-07 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | Elektromotor |
| CN107150184B (zh) * | 2017-06-14 | 2019-10-29 | 芜湖三花制冷配件有限公司 | 一种气分、油分用端盖的装配方法 |
| CN109617293A (zh) * | 2018-10-25 | 2019-04-12 | 舍弗勒技术股份两合公司 | 冷却水套及其制造方法 |
| DE202019102032U1 (de) | 2019-04-09 | 2019-05-29 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | Elektromotor mit einem Motorgehäuse |
-
2020
- 2020-07-23 DE DE102020209305.9A patent/DE102020209305A1/de active Pending
-
2021
- 2021-07-09 EP EP21743162.6A patent/EP4186146A1/de active Pending
- 2021-07-09 WO PCT/EP2021/069104 patent/WO2022017825A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020209305A1 (de) | 2022-01-27 |
| WO2022017825A1 (de) | 2022-01-27 |
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