EP4689427A1 - Rotor für eine elektrische maschine mit verbesserter fixierung einer wellenmutter zur axialen sicherung eines rotorblechpakets - Google Patents
Rotor für eine elektrische maschine mit verbesserter fixierung einer wellenmutter zur axialen sicherung eines rotorblechpaketsInfo
- Publication number
- EP4689427A1 EP4689427A1 EP24712209.6A EP24712209A EP4689427A1 EP 4689427 A1 EP4689427 A1 EP 4689427A1 EP 24712209 A EP24712209 A EP 24712209A EP 4689427 A1 EP4689427 A1 EP 4689427A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- shaft
- nut
- shaft nut
- rotor shaft
- 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
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/30—Locking exclusively by special shape of the screw-thread
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/064—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end non-disconnectable
- F16D1/068—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end non-disconnectable involving gluing, welding or the like
-
- 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
- H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- Rotor for an electrical machine with improved fixation of a shaft nut for axial securing of a rotor laminated core
- the invention relates to a rotor for an electrical machine, which comprises a rotor shaft, a rotor lamination stack with several rotor laminations stacked axially on top of one another, which is mounted on the rotor shaft, and a shaft nut which is screwed onto the rotor shaft and axially secures the rotor lamination stack.
- the invention relates to an electrical machine with a rotor of the above-mentioned type and a vehicle with such an electrical machine.
- the invention also relates to a method for producing a rotor of the above-mentioned type.
- a rotor, an electrical machine, a vehicle and a manufacturing process of the type mentioned are basically known from the prior art.
- the rotor laminations are stacked on top of one another to form a rotor lamination package, which is then axially secured using a shaft nut.
- a shaft nut In order to prevent the shaft nut from coming loose during later operation of the electrical machine, it is often fixed, for example with special locking rings, split pins and the like.
- One object of the invention is therefore to provide an improved rotor, an improved electrical machine, an improved vehicle and an improved manufacturing method for a rotor of an electrical machine.
- the fixation of a shaft nut and thus the axial securing of the rotor laminated core should be simplified.
- automated production of the rotor should be simplified and made more reliable.
- the object of the invention is achieved with a rotor of the type mentioned at the outset, in which an external thread of the rotor shaft and an internal thread of the shaft nut are shaped differently, such that local pressure peaks occur between the shaft nut and the rotor shaft and the shaft nut and the rotor shaft are cold-welded at these points.
- an external thread of the rotor shaft and an internal thread of the shaft nut are shaped differently, and the shaft nut and the rotor shaft are cold-welded at points where local pressure peaks occur between the shaft nut and the rotor shaft.
- the object of the invention is achieved by an electrical machine with a rotor of the above-mentioned type.
- the rotor can in particular have several rotor magnets or rotor windings arranged in the rotor core.
- the electrical machine can in particular comprise a housing and a stator arranged in the housing as well as the rotor of the above-mentioned type arranged in the stator and mounted so as to be rotatable about a rotor axis in the housing.
- the object of the invention is achieved by a vehicle which has an electric machine of the above-mentioned type, which is intended to drive the vehicle.
- a method for producing a rotor which comprises the following steps: a) mounting a rotor laminated core with several rotor laminates stacked axially on a rotor shaft and b) screwing a shaft nut onto the rotor shaft so that the shaft nut axially secures the rotor laminated core, wherein an external thread of the rotor shaft and an internal thread of the shaft nut are shaped differently so that local pressure peaks occur between the shaft nut and the rotor shaft and the shaft nut and the rotor shaft are cold-welded at these points.
- the proposed measures simplify the permanent fixation of a shaft nut and thus the axial securing of the rotor core. This reduces the number of parts required for the electrical machine, and also simplifies automated production of the rotor and makes it more reliable.
- the rotor laminated core is axially pre-tensioned with a press between steps a) and b) and the shaft nut is screwed on without any significant axial pressure and only serves to secure the rotor laminated core.
- the external thread of the rotor shaft and the internal thread of the shaft nut may have different thread pitches, different thread heights, different flank angles and/or different flank widths.
- the different shapes can be made in sections or along the entire length of the thread.
- the measures can be taken in any combination. A combination can be made in sections or along the entire length of the thread. Different measures or combinations of measures can also be selected for different sections of the thread.
- the external thread and/or the internal thread are shaped differently from a standard intended for a screw connection, since standard threads are generally designed in such a way that cold welding does not occur if possible or only at very high axial pressures.
- the external thread or the internal thread is formed according to a standard for a screw connection and the total axial force acting between the shaft nut and the rotor shaft is less than 30% of the axial force permitted according to the standard, especially when cold welding occurs.
- at least one of the threads is manufactured in accordance with the standard and therefore with technically readily available means.
- the non-standard thread is designed in such a way that the cold welding occurs well below the axial force of the standard thread permitted according to the standard. Therefore, with usual diameters of shaft nut and rotor shaft, cold welding occurs before or when the desired axial pressure in the rotor laminated core is reached.
- cold welding can occur even at significantly lower axial pressures than those prevailing after the press is released or when the electrical machine is in operation.
- cold welding occurs without any total axial force acting between the shaft nut and the rotor shaft.
- the shaft nut is only fully loaded when the press is released.
- the external thread of the rotor shaft and the internal thread of the shaft nut are only shaped differently in certain sections. This makes it easier to screw the shaft nut onto the rotor shaft.
- the load-bearing thread length can be freely selected and adapted to the axial pressure required in the rotor laminated core.
- the external thread of the rotor shaft and the internal thread of the shaft nut are shaped differently over their entire length, for example over their entire axial length or over their entire thread length. This makes it easy to produce the external thread and the internal thread.
- the shaft nut is heated in the area of the external thread relative to the rotor shaft prior to step b) and/or the rotor shaft is cooled in the area of the external thread relative to the shaft nut prior to step b), and the temperature of the shaft nut and the rotor shaft are equalized during and after step b), with the shaft nut additionally being pressed onto the rotor shaft.
- the fixation of the shaft nut can be further improved in this way.
- Fig. 1 shows a schematic half-section of an exemplary rotor of an electrical machine
- FIG. 2 a thread in detailed view
- Fig. 3 shows a point in the thread where cold welding occurs, in an enlarged view
- Fig. 4 a rotor in half section during assembly of the rotor core
- Fig. 5 shows an exemplary vehicle with an electric machine of the proposed type.
- Fig. 1 shows a half-section through a schematically illustrated rotor 1 of an electrical machine.
- the rotor 1 comprises a rotor shaft 2 with a rotor axis A and a rotor laminated core 3 with several rotor laminates 4 stacked axially on top of one another, which is mounted on the rotor shaft 2.
- Optional end plates 5, 6 are arranged on the front side of the axial ends of the rotor laminated core 3, wherein the end plate 5 rests on a shaft shoulder 7 and the end plate 6 is pressed against the rotor laminated core 3 with the force FM by a shaft nut 8 screwed onto the rotor shaft 2.
- Fig. 1 shows the two (rolling) bearings 9, 10, with the aid of which the rotor 3 can be rotatably mounted relative to a stator (not shown).
- Fig. 2 shows the external thread G1 of the rotor shaft 2 and the internal thread G2 of the shaft nut 8 in a detailed view, whereby the threads are somewhat spaced apart from each other for reasons of clarity and are not shown in engagement. Specifically, the following thread parameters are shown in Fig. 2: the flank angle cc, the (average) flank width b, the thread height h and the thread pitch s.
- the external thread G1 of the rotor shaft 2 and the internal thread G2 of the shaft nut 8 are shaped differently, such that local pressure peaks occur between the shaft nut 8 and the rotor shaft 2 and the shaft nut 8 and the rotor shaft 2 are cold-welded at these points C.
- Fig. 3 shows such a point C in the thread, where cold welding occurs, in an enlarged view. It can be clearly seen that the thread flanks of the external thread G1 of the rotor shaft 2 and the internal thread G2 of the shaft nut 8 are pressed together and into one another at point C with high pressure, which ultimately creates an inseparable connection in the form of a cold weld. Point C is chosen purely as an example, and cold welding could equally occur at another point C.
- the external thread G1 of the rotor shaft 2 and the internal thread G2 of the shaft nut 8 can have different thread pitches s, different thread heights h, different flank angles a and/or different flank widths b.
- the different shaping can be carried out in sections or over the entire length of the threads G1, G2.
- the measures can be taken in any combination.
- a combination can be carried out in sections or over the entire length of the threads G1, G2.
- Different measures or combinations of measures can also be selected for different sections of the threads G1, G2.
- the external thread G1 of the rotor shaft 2 and the internal thread G2 of the shaft nut 8 are only shaped differently in certain sections. This makes it easier to screw the shaft nut 8 onto the rotor shaft 2.
- the load-bearing thread length can be freely selected and adapted to the axial pressure required in the rotor laminated core 3. This means that the shaft nut 8 can be screwed on normally over a first area of the threads G1, G2 before a second area is reached in which cold welding occurs.
- shaft nut 8 is screwed onto the rotor shaft 2 dry (i.e. without lubricant). This allows the cold welding to occur particularly well and in a process-reliable manner.
- the external thread G1 and/or the internal thread G2 are shaped differently from a standard intended for a screw connection, since standard threads are generally designed in such a way that cold welding does not occur if possible or only at very high axial pressures.
- the external thread G1 or the internal thread G2 is formed according to a standard for a screw connection and the total axial force FM acting between the shaft nut 8 and the rotor shaft 2 is less than 30% of an axial force FM permissible according to the standard, in particular when cold welding occurs.
- at least one of the threads G1, G2 can be produced in accordance with the standard and therefore with readily available technical means.
- the non-standard thread G1, G2 is designed in such a way that the cold welding occurs well below the axial force of the standard thread permissible according to the standard. Therefore, with conventional diameters of the shaft nut 8 and rotor shaft 2, the cold welding occurs before or when the desired axial pressure in the rotor laminated core 3 is reached. This is particularly important when Advantage if the rotor core 3 is prestressed by a press during assembly.
- Fig. 4 shows a schematic representation of the rotor 1 in half section during an exemplary assembly of the rotor laminated core 3 or during an exemplary assembly of the shaft nut 8 on the rotor shaft 2.
- the shaft shoulder 7 is placed on a press table 11 and a pressing force Fp is applied to the end plate 6 and thus to the rotor laminated core 3 using a press ram 12.
- Fp pressing force
- the rotor laminated core 3 is axially pre-tensioned using a press.
- the shaft nut 8 is screwed on. In the process, cold welding occurs between the shaft nut 8 and the rotor shaft 2 in the manner already described.
- the external thread G1 of the rotor shaft 2 and the internal thread G2 of the shaft nut 8 can be shaped in such a way that when cold welding occurs, the shaft nut 8 applies an axial force FM to the rotor laminated core 3 in addition to the pressing force Fp, and the latter is additionally tensioned.
- the total force acting on the rotor lamination stack 3 can be measured and the screwing on of the shaft nut 8 can be controlled accordingly.
- the shaft nut 8 is screwed onto the rotor shaft 2 in a torque-controlled and/or angle-controlled manner.
- the cold welding occurs without such an axial force FM and consequently no axial force FM acting via the pressing force Fp is applied to the rotor lamination stack 3 by the shaft nut 8.
- the shaft nut 8 is heated in the area of the external thread G1 before screwing onto the rotor shaft 2 and/or the rotor shaft 2 is cooled in the area of the external thread G1 before screwing onto the shaft nut 8, and the temperature of the shaft nut 8 and the rotor shaft 2 equalize during and after screwing, wherein the shaft nut 8 is additionally pressed onto the rotor shaft 2.
- the fixation of the shaft nut 8 can be further improved in this way.
- Fig. 5 shows an electric machine 14 installed in a vehicle 13, which has the presented rotor 1.
- the vehicle 13 has two axles, one of which is driven.
- the electric machine 14 is connected to the half-axles 16 of the rear axle or front axle via an optional transmission 15.
- the driven wheels 17 are mounted on the half-axles 16.
- the electric machine 14, the transmission 15 and the half-axles 16 are part of the drive train of the vehicle 13.
- the vehicle 13 is driven at least partially or temporarily by the electric machine 14. This means that the electric machine 14 can serve to drive the vehicle 13 alone or, for example, can be provided in conjunction with an internal combustion engine (hybrid drive).
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023107821.6A DE102023107821A1 (de) | 2023-03-28 | 2023-03-28 | Rotor für eine elektrische Maschine mit verbesserter Fixierung einer Wellenmutter zur axialen Sicherung eines Rotorblechpakets |
| PCT/EP2024/056851 WO2024200035A1 (de) | 2023-03-28 | 2024-03-14 | Rotor für eine elektrische maschine mit verbesserter fixierung einer wellenmutter zur axialen sicherung eines rotorblechpakets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4689427A1 true EP4689427A1 (de) | 2026-02-11 |
Family
ID=90366135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24712209.6A Pending EP4689427A1 (de) | 2023-03-28 | 2024-03-14 | Rotor für eine elektrische maschine mit verbesserter fixierung einer wellenmutter zur axialen sicherung eines rotorblechpakets |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4689427A1 (de) |
| CN (1) | CN120936815A (de) |
| DE (1) | DE102023107821A1 (de) |
| WO (1) | WO2024200035A1 (de) |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7314712U (de) * | 1973-11-08 | H Hauser Inh W Schoettle Mutternfab | Selbstsichernde Mutter | |
| WO1999064201A1 (en) * | 1998-06-10 | 1999-12-16 | Steinbock Machinery Co. | Jackbolts for multi jackbolt tensioners |
| JP2015116022A (ja) * | 2013-12-11 | 2015-06-22 | トヨタ自動車株式会社 | 回転電機ロータ |
| JP2015126684A (ja) * | 2013-12-27 | 2015-07-06 | トヨタ自動車株式会社 | ロータの製造方法 |
| DE102014106614A1 (de) * | 2014-05-12 | 2015-11-12 | Thyssenkrupp Presta Teccenter Ag | Rotorwelle mit Blechpaket |
| JP2016093015A (ja) * | 2014-11-06 | 2016-05-23 | トヨタ自動車株式会社 | 電動機用ロータ |
| JP2017041991A (ja) * | 2015-08-20 | 2017-02-23 | トヨタ自動車株式会社 | ロータコアの製造方法 |
| JP6409837B2 (ja) * | 2016-09-08 | 2018-10-24 | トヨタ自動車株式会社 | 回転電機ロータ及び回転電機ロータの製造方法 |
| DE102018009845A1 (de) * | 2018-12-14 | 2019-06-27 | Daimler Ag | Rotor für eine elektrische Maschine, insbesondere eines Kraftfahrzeugs |
| DE102020112037A1 (de) * | 2020-05-05 | 2021-11-11 | Audi Aktiengesellschaft | Rotor für eine elektrische Maschine |
| GB2597948B (en) * | 2020-08-11 | 2022-09-14 | Sibary Wheatcroft Ivor | Vehicle axle repair and re-threading apparatus and method |
| JP2022178651A (ja) * | 2021-05-20 | 2022-12-02 | 株式会社アイシン | ロータ |
| IT202100014567A1 (it) * | 2021-06-04 | 2022-12-04 | Marelli Europe Spa | Rotore di macchina elettrica e relativa macchina elettrica |
-
2023
- 2023-03-28 DE DE102023107821.6A patent/DE102023107821A1/de active Pending
-
2024
- 2024-03-14 WO PCT/EP2024/056851 patent/WO2024200035A1/de not_active Ceased
- 2024-03-14 EP EP24712209.6A patent/EP4689427A1/de active Pending
- 2024-03-14 CN CN202480022668.8A patent/CN120936815A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102023107821A1 (de) | 2024-10-02 |
| WO2024200035A1 (de) | 2024-10-03 |
| CN120936815A (zh) | 2025-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3649724B1 (de) | Verfahren zur herstellung eines rotors für einen elektromotor und mit diesem verfahren hergestellter rotor | |
| EP4038271B1 (de) | Windenergieanlagenrotorblatt und verfahren zum verbinden zweier rotorblattsegmente | |
| WO2018036956A1 (de) | Gebaute rotorwelle asymmetrischer bauweise sowie rotor und verfahren zur herstellung der gebauten rotorwelle und des rotors | |
| DE19824382A1 (de) | Schneckengetriebe | |
| DE102020203483A1 (de) | Rotor eines Elektromotors | |
| DE102016010224A1 (de) | Elektrische Maschine für ein Kraftfahrzeug, Herstellungsverfahren und Stanzwerkzeug | |
| EP4002659A1 (de) | Elektrische maschine, verfahren zur herstellung einer stator-/gehäuseanordnung für eine elektrische maschine und fahrzeug | |
| EP3787155A1 (de) | Welle, rotorblech sowie rotor für eine elektrische maschine, elektrische maschine, fahrzeug und herstellungsverfahren für einen rotor | |
| DE102018208265B3 (de) | Rotor für eine elektrische Maschine | |
| WO2024200035A1 (de) | Rotor für eine elektrische maschine mit verbesserter fixierung einer wellenmutter zur axialen sicherung eines rotorblechpakets | |
| WO2025040415A1 (de) | Statoranordnung für eine elektrische maschine mit vereinfachter montage des statorblechpakets im statorgehäuse | |
| WO2021032762A1 (de) | Verfahren zur anordnung einer elektrischen maschine auf einem getriebe und antriebseintrichtung | |
| DE102022127223B4 (de) | Differentialgetriebe für ein Kraftfahrzeug mit einem durch eine Schweißnaht mit Entlastungsnut an einem Käfig angeordneten Zahnrad | |
| DE102020003956A1 (de) | Verfahren zum Erzeugen einer Rotorwelle sowie Rotorwelle für eine E-Maschine | |
| DE102022125700A1 (de) | Rotor für eine elektrische Maschine mit verbesserten Halteelementen zur axialen Fixierung eines Rotorblechpakets | |
| EP0597917B1 (de) | Welle mit angeformter Schnecke | |
| AT525718B1 (de) | Rotor | |
| DE102020119442A1 (de) | Verfahren zur Herstellung eines Zwischenprodukts für eine elektrische Maschine, umfassend ein Statorblechpaket und einen damit verbundenen Gehäuseteil des Gehäuses | |
| DE102021202990A1 (de) | Rotorträger für einen Rotor einer elektrischen Maschine | |
| DE102023121415A1 (de) | Rotorblechpaket mit verbesserter axialer Fixierung und Verfahren zum Herstellen eines Rotors mit einem solchen Rotorblechpaket | |
| DE102021208413A1 (de) | Welle für eine elektrische Maschine | |
| DE102023118356A1 (de) | Verbesserte Fixierung von Rotormagneten in einem Rotor einer elektrischen Maschine | |
| WO2025040775A1 (de) | Verbessertes verfahren zum herstellen geschrägter statoren mit statorwicklungen mit parallelen leiterabschnitten | |
| WO2018137954A1 (de) | Anordnung einer achse oder einer welle an einem bauelement, insbesondere für ein fahrzeug, sowie fahrzeug mit einer solchen anordnung | |
| DE102023106058A1 (de) | Rotor für eine elektrische Maschine mit verbesserter axialer Fixierung eines Rotorblechpakets |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
| 17P | Request for examination filed |
Effective date: 20250922 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VALEO ELECTRIFICATION |