WO2021013456A1 - Electrical drive unit for an at least partially electrified motor vehicle - Google Patents

Electrical drive unit for an at least partially electrified motor vehicle Download PDF

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Publication number
WO2021013456A1
WO2021013456A1 PCT/EP2020/067691 EP2020067691W WO2021013456A1 WO 2021013456 A1 WO2021013456 A1 WO 2021013456A1 EP 2020067691 W EP2020067691 W EP 2020067691W WO 2021013456 A1 WO2021013456 A1 WO 2021013456A1
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WO
WIPO (PCT)
Prior art keywords
bearing
differential
gear
drive unit
electrical machine
Prior art date
Application number
PCT/EP2020/067691
Other languages
German (de)
French (fr)
Inventor
Bernhard Steiner
Clemens Ortmayr
Original Assignee
Magna powertrain gmbh & co kg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Magna powertrain gmbh & co kg filed Critical Magna powertrain gmbh & co kg
Publication of WO2021013456A1 publication Critical patent/WO2021013456A1/en

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Classifications

    • 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
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • 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
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
    • F16H3/62—Gearings having three or more central gears
    • F16H3/66—Gearings having three or more central gears composed of a number of gear trains without drive passing from one train to another
    • F16H3/663—Gearings having three or more central gears composed of a number of gear trains without drive passing from one train to another with conveying rotary motion between axially spaced orbital gears, e.g. RAVIGNEAUX
    • 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
    • F16H—GEARING
    • F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
    • F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
    • F16H37/06—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F16H37/08—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing
    • F16H37/0806—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with a plurality of driving or driven shafts
    • F16H37/0813—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with a plurality of driving or driven shafts with only one input shaft
    • F16H37/082—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts with differential gearing with a plurality of driving or driven shafts with only one input shaft and additional planetary reduction gears
    • 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
    • H02K7/006—Structural association of a motor or generator with the drive train of a motor vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/001—Arrangement or mounting of electrical propulsion units one motor mounted on a propulsion axle for rotating right and left wheels of this axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/70—Gearings
    • B60Y2400/73—Planetary gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2410/00—Constructional features of vehicle sub-units
    • B60Y2410/102—Shaft arrangements; Shaft supports, e.g. bearings
    • 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
    • F16H—GEARING
    • F16H2200/00—Transmissions for multiple ratios
    • F16H2200/0021—Transmissions for multiple ratios specially adapted for electric vehicles
    • 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
    • F16H—GEARING
    • F16H2200/00—Transmissions for multiple ratios
    • F16H2200/20—Transmissions using gears with orbital motion
    • F16H2200/2002—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears
    • F16H2200/2007—Transmissions using gears with orbital motion characterised by the number of sets of orbital gears with two sets of orbital gears
    • 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
    • F16H—GEARING
    • F16H2200/00—Transmissions for multiple ratios
    • F16H2200/20—Transmissions using gears with orbital motion
    • F16H2200/2097—Transmissions using gears with orbital motion comprising an orbital gear set member permanently connected to the housing, e.g. a sun wheel permanently connected to the housing

Definitions

  • Electric drive unit for an at least partially
  • the present invention relates to an electric drive unit for an at least partially electrified motor vehicle comprising an electric machine, a differential gear, a reduction gear, the electrical machine being operatively connected or connectable to the differential gear via the reduction gear and a bearing arrangement with at least two bearings
  • Electric drive arrangements for an at least partially electrified motor vehicle often have an electric machine, a one- or two-stage reduction gear and a differential gear. Furthermore, a decoupling device can be provided for the optional drive connection of electrical machine and differential gear. The electric machine is driven via the reduction gear with the differential gear connected or connectable. With a given installation space and a fixed diameter of the electric machine, the maximum possible torque of the electric drive unit is specified by the active length of the electric machine and the translation of the reduction gear.
  • an electric drive unit for an at least partially electrified motor vehicle comprising an electric machine, a differential gear, the differential gear being essentially coaxial with respect to an axis of rotation of the electric machine and having a differential cage Reduction gear, the reduction gear being designed as a planetary gear with a planetary gear carrier, as well as a bearing arrangement with at least a first bearing and a second bearing, wherein the electric machine is drivingly connected or connectable to the differential gear via the reduction gear, the differential cage of the differential gear being fixed is connected to the planet carrier of the reduction gear, the first bearing and the second bearing are arranged on the rotor shaft and the rotor shaft, the planetary gear, via the first bearing and the second bearing carrier of the reduction gear and thus also the differential cage are mounted.
  • the electric drive unit has an electric machine, a reduction gear, a differential gear and a bearing arrangement.
  • the electric machine can be operated as a generator or as a motor.
  • the reduction gear is designed according to the present invention as a Pla netenrad gear and has a planet carrier.
  • the differential gear has a differential carrier. According to the invention, the differential gear is also arranged essentially coaxially with respect to an axis of rotation of the electrical machine.
  • the bearing arrangement has at least two bearings, namely a first bearing and a second bearing.
  • the electric machine is connected or can be connected to the differential gear so as to drive it via the reduction gear.
  • the differential carrier of the differential gear is firmly connected to the planet carrier of the reduction gear.
  • a “fixed connection” can be understood to mean, in addition to common methods of connecting components such as screws, gluing, welding, clipping, etc., also a one-piece design of the two components differential cage and planetary gear carrier.
  • the first bearing and the second bearing are arranged on the rotor shaft.
  • the first camp and the second camp are corresponding to the present invention, the rotor shaft, the planet carrier and thus also the differential carrier is supported.
  • the electrical machine preferably has a rotor and a stator, the rotor being fixed, i.e. axially fixed and non-rotatable, arranged on a rotor shaft and being rotatable about the central axis of rotation.
  • the stator has an end winding on each of its end faces.
  • the first bearing of the bearing arrangement is arranged in an axial direction at the level of the end winding of the electrical machine facing the differential gear.
  • the direction indication “axial” describes a direction essentially along or parallel to the axis of rotation of the electrical machine.
  • the direction indication “radial” describes a direction essentially normal to the axis of rotation of the electrical machine.
  • the first bearing and the second bearing are preferably designed as floating bearings.
  • the first bearing and the second bearing are preferably leads out as needle bearings. However, they can also be designed as another common bearing.
  • the electrical machine is in direct contact with a coolant, at least during operation, ie the electrical machine is designed as a “wet” electrical machine.
  • Active cooling in particular of the end windings, can increase the continuous torque or continuous output of the electrical machine.
  • Due to the inventive design of the electric drive unit in particular due to its double use as a bearing for the rotor shaft, the planet wheel carrier and thus also for the differential cage, an optimized installation space with regard to the active length of the electric machine can be made available for the electric machine and thus a torque and power increase of the electric drive unit can be achieved.
  • Another advantageous aspect of this is the targeted placement of the first bearing.
  • the electric drive unit has a high degree of integration due to the nested structure and thus the optimal use of installation space. Through the double use of the first bearing and the second bearing, components can also be saved and thus a cost-reduced electric drive unit can be produced.
  • Fig. Shows a schematic representation of an electrical drive unit to
  • FIG. 1 An electric drive unit 1 according to the present inven tion is shown schematically.
  • the electric drive unit 1 is suitable for this to be installed in an at least partially electrified motor vehicle, i.e. in an electric or hybrid vehicle.
  • the electric drive unit 1 has an electric machine 2, a reduction gear 9 and a differential gear 11.
  • the electric machine 2 is connected to the differential gear 11 in a driving manner via the reduction gear 9.
  • the electrical machine 2 and the differential gear 11 are also arranged essentially coaxially with respect to an axis of rotation 3.
  • the electrical machine 2 comprises a rotor 5 and a stator 6.
  • the rotor 5 is fixed, i.e. axially fixed and rotationally fixed, on a rotor shaft 4.
  • the rotor shaft 4 and thus the rotor 5 are rotatable about the axis of rotation 3.
  • the stator 6 surrounds the rotor 5 on the outside and has a plurality of stator windings (not shown) which are electrically connected to the end faces 14, 15 of the stator 6 in the form of a winding head 7, 8 each. That is, a first end winding 7 is implemented on a first end face 14 of the stator 6 and a second end winding 8 is implemented on a second end face 15 of the stator 6.
  • the first end winding 7 represents an end winding 7 of the electrical machine 2 facing the differential gear 11.
  • the reduction gear 9 is designed as a planetary gear, the planetary gear having a sun gear 16, a double planetary gear 17 and a planetary gear carrier 10 carrying the double planetary gear 17.
  • the double planetary gear 17 has a first planet gear 17 ‘and a second planet gear 17, the first planet gear 17‘ with the sun gear 16 and the second planet gear 17 with a toothing in a housing 25 in the rotary handle.
  • the sun gear 16 is fixedly connected to the rotor shaft 4 of the electrical machine 2.
  • the differential gear 11 has a differential cage 12 which is firmly connected to the planetary gear carrier 10 of the reduction gear 9.
  • the differential carrier 12 of the differential gear 1 1 is thus driven via the planet carrier 10.
  • the differential gear comprises four differential bevel gears 19 rotatably mounted on a pin 18.
  • the differential bevel gears 19 are not connected to one another in a torque-relevant connection, but they are in a torque-relevant connection with output bevel gears 20.
  • the Abrete gelzier 20 are each firmly connected to an output shaft 21.
  • the electric drive unit 1 has a bearing arrangement with four bearings, namely a first bearing 13, a second bearing 22, a third bearing 23 and a fourth bearing 24.
  • the first bearing 13 and the second bearing 22 are each designed as floating bearings.
  • the third bearing 23 and the fourth bearing 24 are each designed as a fixed bearing.
  • the first bearing 13 is arranged in an axial direction, namely a direction along the axis of rotation 3 of the rotor 5, exactly at the level of the first end winding 7 of the stator 6 on the rotor shaft 4.
  • the Ro gate shaft 4 of the electrical machine 2 the planet carrier 10 of the reduction gear 9 and thus also the differential cage 12 of the differential gear 1 1 are mounted.
  • the rotor shaft 4 is also supported via the third bearing 23, where the third bearing 23 in the embodiment of the present invention shown in FIG. could also be omitted, since the rotor shaft 4 is centered under load via the planet gears 17 ', 17 " .
  • the second bearing 22 serves as a support bearing between the rotor shaft 4 and the differential carrier 12.
  • the second bearing 22 is also net angeord on the rotor shaft 4.
  • the rotor shaft 4 of the electrical Ma machine 2 the planetary gear carrier 10 of the reduction gear 9 and thus also the differential cage 12 of the differential gear 1 1 are mounted.
  • the first bearing 13 and the second bearing 22 are each manufactured det as needle bearings.
  • a needle roller bearing is a roller bearing in which between an inner ring (not shown) and an outer ring (not shown), in contrast to the lubrication in plain bearings, rolling bodies reduce the frictional resistance.
  • the planetary gear carrier 10 and the differential carrier 12 are each mounted on the outer ring of the two bearings 13, 22; the rotor shaft 4 is mounted on the inner ring of the two bearings 13, 22.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

Electrical drive unit (1) for an at least partially electrified motor vehicle, comprising an electrical machine (2), a differential gear mechanism (11), wherein the differential gear mechanism (11) is arranged in a manner substantially coaxial with respect to an axis of rotation (3) of the electrical machine (2) and has a differential cage (12), a reduction gear mechanism (9), wherein the reduction gear mechanism (9) is in the form of a planetary gear mechanism having a planetary gear carrier (10), and a bearing arrangement having at least one first bearing (13) and one second bearing (22), wherein the electrical machine (2) is or can be connected to the differential gear mechanism (11) for drive action via the reduction gear mechanism (9), wherein the differential cage (12) of the differential gear mechanism (11) is permanently connected to the planetary gear carrier (10) of the reduction gear mechanism (9), wherein the first bearing (13) and the second bearing (22) are arranged on the rotor shaft (4), and the rotor shaft (4), the planetary gear carrier (10) and therefore also the differential cage (12) are mounted via the first bearing (13) and the second bearing (22).

Description

Elektrische Antriebseinheit für ein zumindest teilweise Electric drive unit for an at least partially
elektrifiziertes Kraftfahrzeug electrified motor vehicle
Gebiet der Erfindung Field of invention
Die vorliegende Erfindung betrifft eine elektrische Antriebseinheit für ein zumindest teilweise elektrifiziertes Kraftfahrzeug umfassend eine elektrische Maschine, ein Differentialgetriebe, ein Untersetzungsgetriebe, wobei die elektrische Maschine über das Untersetzungsgetriebe antriebswirksam mit dem Differentialgetriebe verbunden oder verbindbar ist und eine Lageranordnung mit zumindest zwei La gern The present invention relates to an electric drive unit for an at least partially electrified motor vehicle comprising an electric machine, a differential gear, a reduction gear, the electrical machine being operatively connected or connectable to the differential gear via the reduction gear and a bearing arrangement with at least two bearings
Stand der Technik State of the art
Bei der Entwicklung von Kraftfahrzeugen mit zumindest teilweise elektrifizierten Antriebssträngen steht man aufgrund des begrenzt zur Verfügung stehenden Bauraums immer öfter vor dem Problem möglichst viel Leistung aus möglichst klein bauenden Antriebsanordnungen zu generieren. Daher ist man gezwungen die„Packungsdichte“ zu erhöhen und die einzelnen Teilsysteme eines An triebstrangs in sich oder auch untereinander zu verschachteln. In the development of motor vehicles with at least partially electrified drive trains, the problem of generating as much power as possible from drive arrangements that are as small as possible is more and more often due to the limited installation space available. It is therefore necessary to increase the “packing density” and to interleave the individual subsystems of a drive train within themselves or with one another.
Elektrische Antriebsanordnungen für ein zumindest teilweise elektrifiziertes Kraft fahrzeug weisen oftmals eine elektrische Maschine, ein ein- oder zweistufiges Untersetzungsgetriebe sowie ein Differentialgetriebe auf. Weiterhin kann eine Entkoppeleinrichtung zur wahlweisen antriebswirksamen Verbindung von elektri scher Maschine und Differentialgetriebe vorgesehen sein. Die elektrische Maschi ne ist dabei über das Untersetzungsgetriebe antriebswirksam mit dem Differential- getriebe verbunden oder verbindbar. Das maximal mögliche Drehmoment der elektrischen Antriebseinheit ist bei gegebenem Bauraum und einem fixen Durch messer der elektrischen Maschine, durch die Aktivlänge der elektrischen Maschi ne und die Übersetzung des Untersetzungsgetriebes vorgegeben. Electric drive arrangements for an at least partially electrified motor vehicle often have an electric machine, a one- or two-stage reduction gear and a differential gear. Furthermore, a decoupling device can be provided for the optional drive connection of electrical machine and differential gear. The electric machine is driven via the reduction gear with the differential gear connected or connectable. With a given installation space and a fixed diameter of the electric machine, the maximum possible torque of the electric drive unit is specified by the active length of the electric machine and the translation of the reduction gear.
Zusammenfassung der Erfindung Summary of the invention
Es ist eine Aufgabe der Erfindung eine verbesserte elektrische Antriebseinheit für ein zumindest teilweise elektrifiziertes Kraftfahrzeug anzugeben, dass sich insbe sondere durch einen möglichst großen axialen Bauraum für eine elektrische Ma schine auszeichnet. It is an object of the invention to provide an improved electric drive unit for an at least partially electrified motor vehicle that is characterized in particular by the largest possible axial installation space for an electric machine.
Die Lösung der Aufgabe erfolgt durch eine elektrische Antriebseinheit für ein zu mindest teilweise elektrifiziertes Kraftfahrzeug umfassend eine elektrische Ma schine, ein Differentialgetriebe, wobei das Differentialgetriebe in Bezug auf eine Drehachse der elektrischen Maschine im Wesentlichen koaxial zu dieser angeord net ist und einen Differentialkorb aufweist, ein Untersetzungsgetriebe, wobei das Untersetzungsgetriebe als Planetenradgetriebe mit einem Planetenradträger aus geführt ist, sowie eine Lageranordnung mit zumindest einem ersten Lager und einem zweiten Lager, wobei die elektrische Maschine über das Untersetzungsge triebe antriebswirksam mit dem Differentialgetriebe verbunden oder verbindbar ist, wobei der Differentialkorb des Differentialgetriebes fest mit dem Planetenradträger des Untersetzungsgetriebes verbunden ist, wobei das erste Lager und das zweite Lager auf der Rotorwelle angeordnet sind und über das erste Lager und das zwei te Lager die Rotorwelle, der Planetenradträger des Untersetzungsgetriebes und somit auch der Differentialkorb gelagert sind. Erfindungsgemäß weist die elektrische Antriebseinheit eine elektrische Maschine, ein Untersetzungsgetriebe, ein Differentialgetriebe sowie eine Lageranordnung auf. The object is achieved by an electric drive unit for an at least partially electrified motor vehicle comprising an electric machine, a differential gear, the differential gear being essentially coaxial with respect to an axis of rotation of the electric machine and having a differential cage Reduction gear, the reduction gear being designed as a planetary gear with a planetary gear carrier, as well as a bearing arrangement with at least a first bearing and a second bearing, wherein the electric machine is drivingly connected or connectable to the differential gear via the reduction gear, the differential cage of the differential gear being fixed is connected to the planet carrier of the reduction gear, the first bearing and the second bearing are arranged on the rotor shaft and the rotor shaft, the planetary gear, via the first bearing and the second bearing carrier of the reduction gear and thus also the differential cage are mounted. According to the invention, the electric drive unit has an electric machine, a reduction gear, a differential gear and a bearing arrangement.
Die elektrische Maschine kann sowohl generatorisch wie auch motorisch betrieben werden. The electric machine can be operated as a generator or as a motor.
Das Untersetzungsgetriebe ist entsprechend der vorliegenden Erfindung als Pla netenradgetriebe ausgebildet und weist einen Planetenradträger auf. The reduction gear is designed according to the present invention as a Pla netenrad gear and has a planet carrier.
Das Differentialgetriebe weist erfindungsgemäß einen Differentialkorb auf. Das Differentialgetriebe ist weiterhin erfindungsgemäß in Bezug auf eine Drehachse der elektrischen Maschine im Wesentlichen koaxial zu dieser angeordnet. According to the invention, the differential gear has a differential carrier. According to the invention, the differential gear is also arranged essentially coaxially with respect to an axis of rotation of the electrical machine.
Die Lageranordnung weist erfindungsgemäß zumindest zwei Lager, nämlich ein erstes Lager und ein zweites Lager auf. According to the invention, the bearing arrangement has at least two bearings, namely a first bearing and a second bearing.
Die elektrische Maschine ist erfindungsgemäß über das Untersetzungsgetriebe antriebswirksam mit dem Differentialgetriebe verbunden oder verbindbar. According to the invention, the electric machine is connected or can be connected to the differential gear so as to drive it via the reduction gear.
Entsprechend der vorliegenden Erfindung ist der Differentialkorb des Differential getriebes fest mit dem Planetenradträger des Untersetzungsgetriebes verbunden. Unter einer„festen Verbindung“ kann in diesem Zusammenhang neben gängigen Verbindungsmethoden von Bauteilen, wie beispielsweise Schrauben, Kleben, Schweißen, Verklippen, etc., auch eine einteilige Ausführung der beiden Kompo nenten Differentialkorb und Planetenradträger verstanden werden. According to the present invention, the differential carrier of the differential gear is firmly connected to the planet carrier of the reduction gear. In this context, a “fixed connection” can be understood to mean, in addition to common methods of connecting components such as screws, gluing, welding, clipping, etc., also a one-piece design of the two components differential cage and planetary gear carrier.
Erfindungsgemäß sind das erste Lager und das zweite Lager auf der Rotorwelle angeordnet. Über das erste Lager und das zweite Lager sind entsprechend der vorliegenden Erfindung die Rotorwelle, der Planetenradträger und somit auch der Differentialkorb gelagert. According to the invention, the first bearing and the second bearing are arranged on the rotor shaft. About the first camp and the second camp are corresponding to the present invention, the rotor shaft, the planet carrier and thus also the differential carrier is supported.
Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen, der Beschrei bung sowie den beigefügten Zeichnungen angegeben. Developments of the invention are specified in the dependent claims, the description and the accompanying drawings.
Die elektrische Maschine weist bevorzugt einen Rotor und einen Stator auf, wobei der Rotor fest, d.h. axial fest und drehfest, auf einer Rotorwelle angeordnet ist und um die zentrale Drehachse drehbar ist. Der Stator weist an seinen Stirnseiten jeweils einen Wicklungskopf auf. In einer besonders bevorzugten Ausführungsva riante der vorliegenden Erfindung ist das erste Lager der Lageranordnung in einer axialen Richtung auf Höhe des dem Differentialgetriebe zugewandten stirnseitigen Wickelkopfs der elektrischen Maschine angeordnet. The electrical machine preferably has a rotor and a stator, the rotor being fixed, i.e. axially fixed and non-rotatable, arranged on a rotor shaft and being rotatable about the central axis of rotation. The stator has an end winding on each of its end faces. In a particularly preferred variant of the present invention, the first bearing of the bearing arrangement is arranged in an axial direction at the level of the end winding of the electrical machine facing the differential gear.
Die Richtungsangabe„axial“ beschreibt eine Richtung im Wesentlichen entlang oder parallel zu der Drehachse der elektrischen Maschine. The direction indication “axial” describes a direction essentially along or parallel to the axis of rotation of the electrical machine.
Die Richtungsangabe„radial“ beschreibt eine Richtung im Wesentlichen normal zu der Drehachse der elektrischen Maschine. The direction indication “radial” describes a direction essentially normal to the axis of rotation of the electrical machine.
Bevorzugt sind das erste Lager und das zweite Lager als Loslager ausgeführt. The first bearing and the second bearing are preferably designed as floating bearings.
Das erste Lager und das zweite Lager sind vorzugsweise als Nadellager ausge führt. Sie können jedoch auch als ein anderes gängiges Lager ausgeführt werden. The first bearing and the second bearing are preferably leads out as needle bearings. However, they can also be designed as another common bearing.
In einer vorteilhaften Ausführungsvariante der vorliegenden Erfindung steht die elektrische Maschine zumindest im Betrieb direkt mit einem Kühlmittel in Berüh rung, d.h. die elektrische Maschine ist als„nass“ laufende elektrische Maschine ausgeführt. Durch eine aktive Kühlung, insbesondere der Wickelköpfe, kann die Dauermoment- bzw. Dauerleistung der elektrischen Maschine gesteigert werden. Durch die erfindungsgemäße Ausführung der elektrischen Antriebseinheit, insbe sondere durch dessen Doppelnutzung als Lager für die Rotorwelle, den Planeten radträger und somit auch für den Differentialkorb, kann für die elektrische Maschi ne ein hinsichtlich der Aktivlänge der elektrischen Maschine optimierter Bauraum zur Verfügung gestellt werden und somit eine Drehmoment- und Leistungssteige rung der elektrischen Antriebseinheit erzielt werden. Ein weiterer vorteilhafter Aspekt dazu stellt die gezielte Platzierung des ersten Lagers dar. Die elektrische Antriebseinheit weist durch den verschachtelten Aufbau und somit die optimale Nutzung von Bauraum einen hohen Integrationsgrad auf. Durch die Doppelnut zung des ersten Lagers und des zweiten Lagers können zudem Bauteile einge spart werden und somit kann eine kostenreduzierte elektrische Antriebseinheit dargestellt werden. In an advantageous embodiment variant of the present invention, the electrical machine is in direct contact with a coolant, at least during operation, ie the electrical machine is designed as a “wet” electrical machine. Active cooling, in particular of the end windings, can increase the continuous torque or continuous output of the electrical machine. Due to the inventive design of the electric drive unit, in particular due to its double use as a bearing for the rotor shaft, the planet wheel carrier and thus also for the differential cage, an optimized installation space with regard to the active length of the electric machine can be made available for the electric machine and thus a torque and power increase of the electric drive unit can be achieved. Another advantageous aspect of this is the targeted placement of the first bearing. The electric drive unit has a high degree of integration due to the nested structure and thus the optimal use of installation space. Through the double use of the first bearing and the second bearing, components can also be saved and thus a cost-reduced electric drive unit can be produced.
Kurzbeschreibung der Zeichnungen Brief description of the drawings
Die Erfindung wird im Folgenden beispielhaft unter Bezugnahme auf die Zeich nungen beschrieben. The invention is described below by way of example with reference to the drawings.
Fig. zeigt eine schematische Darstellung einer elektrische An triebseinheit Fig. Shows a schematic representation of an electrical drive unit to
Detaillierte Beschreibung der Erfindung Detailed description of the invention
In Fig. ist eine elektrische Antriebseinheit 1 entsprechend der vorliegenden Erfin dung schematisch dargestellt. Die elektrische Antriebseinheit 1 ist dazu geeignet in einem zumindest teilweise elektrifizierten Kraftfahrzeug, also in einem Elektro- oder Hybridkraftfahrzeug, verbaut zu werden. In Fig. An electric drive unit 1 according to the present inven tion is shown schematically. The electric drive unit 1 is suitable for this to be installed in an at least partially electrified motor vehicle, i.e. in an electric or hybrid vehicle.
Die elektrische Antriebseinheit 1 weist eine elektrische Maschine 2, ein Unterset zungsgetriebe 9 und ein Differentialgetriebe 1 1 auf. Die elektrische Maschine 2 ist über das Untersetzungsgetriebe 9 antriebswirksam mit dem Differentialgetriebe 1 1 verbunden. Die elektrische Maschine 2 und das Differentialgetriebe 1 1 sind zudem in Bezug auf eine Drehachse 3 im Wesentlichen koaxial angeordnet. The electric drive unit 1 has an electric machine 2, a reduction gear 9 and a differential gear 11. The electric machine 2 is connected to the differential gear 11 in a driving manner via the reduction gear 9. The electrical machine 2 and the differential gear 11 are also arranged essentially coaxially with respect to an axis of rotation 3.
Die elektrische Maschine 2 umfasst einen Rotor 5 und einen Stator 6. Der Rotor 5 ist fest, d.h. axial fest und drehfest, auf einer Rotorwelle 4 angeordnet. Die Rotor welle 4 und somit der Rotor 5 sind um die Drehachse 3 drehbar. Der Stator 6 umgibt den Rotor 5 außenumfänglich und weist mehrere Statorwicklungen (nicht dargestellt) auf, die an den Stirnseiten 14, 15 des Stators 6 in Form von jeweils einem Wickelkopf 7, 8 elektrisch verschaltet sind. D.h. an einer ersten Stirnseite 14 des Stators 6 ist ein erster Wickelkopf 7 ausgeführt und an einer zweiten Stirn seite 15 des Stators 6 ist ein zweiter Wickelkopf 8 ausgeführt. In Fig. stellt der erste Wickelkopf 7 einen dem Differentialgetriebe 1 1 zugewandten stirnseitigen Wickelkopf 7 der elektrischen Maschine 2 dar. The electrical machine 2 comprises a rotor 5 and a stator 6. The rotor 5 is fixed, i.e. axially fixed and rotationally fixed, on a rotor shaft 4. The rotor shaft 4 and thus the rotor 5 are rotatable about the axis of rotation 3. The stator 6 surrounds the rotor 5 on the outside and has a plurality of stator windings (not shown) which are electrically connected to the end faces 14, 15 of the stator 6 in the form of a winding head 7, 8 each. That is, a first end winding 7 is implemented on a first end face 14 of the stator 6 and a second end winding 8 is implemented on a second end face 15 of the stator 6. In FIG. 1, the first end winding 7 represents an end winding 7 of the electrical machine 2 facing the differential gear 11.
Das Untersetzungsgetriebe 9 ist als Planetenradgetriebe ausgebildet, wobei das Planetenradgetriebe ein Sonnenrad 16, ein Doppelplanetenrad 17 und einen das Doppelplanetenrad 17 tragenden Planetenradträger 10 aufweist. The reduction gear 9 is designed as a planetary gear, the planetary gear having a sun gear 16, a double planetary gear 17 and a planetary gear carrier 10 carrying the double planetary gear 17.
Das Doppelplanetenrad 17 weist ein erstes Planetenrad 17‘ und ein zweites Pla netenrad 17“ auf, wobei das erste Planetenrad 17‘ mit dem Sonnenrad 16 und das zweite Planetenrad 17“ mit einer Verzahnung in einem Gehäuse 25 im Drehein griff steht. The double planetary gear 17 has a first planet gear 17 ‘and a second planet gear 17, the first planet gear 17‘ with the sun gear 16 and the second planet gear 17 with a toothing in a housing 25 in the rotary handle.
Das Sonnenrad 16 ist fest mit der Rotorwelle 4 der elektrischen Maschine 2 ver bunden. Das Differentialgetriebe 1 1 ist weist einen Differentialkorb 12, der fest mit dem Planetenradträger 10 des Untersetzungsgetriebes 9 verbunden ist, auf. Über den Planetenträger 10 wird somit der Differentialkorb 12 des Differentialgetriebes 1 1 angetrieben. Des Weiteren umfasst das Differentialgetriebe vier, auf einem Bolzen 18 drehbar gelagerte Ausgleichskegelräder 19. Die Ausgleichskegelräder 19 ste hen untereinander nicht in drehmomentrelevanter Verbindung, jedoch stehen sie mit Abtriebskegelrädern 20 in drehmomentrelevanter Verbindung. Die Abtriebske gelräder 20 sind jeweils mit einer Abtriebswelle 21 fest verbunden. The sun gear 16 is fixedly connected to the rotor shaft 4 of the electrical machine 2. The differential gear 11 has a differential cage 12 which is firmly connected to the planetary gear carrier 10 of the reduction gear 9. The differential carrier 12 of the differential gear 1 1 is thus driven via the planet carrier 10. Furthermore, the differential gear comprises four differential bevel gears 19 rotatably mounted on a pin 18. The differential bevel gears 19 are not connected to one another in a torque-relevant connection, but they are in a torque-relevant connection with output bevel gears 20. The Abtriebske gelräder 20 are each firmly connected to an output shaft 21.
Die elektrische Antriebseinheit 1 weist eine Lageranordnung mit vier Lagern, näm lich einem ersten Lager 13, einem zweiten Lager 22, einem dritten Lager 23 und einem vierten Lager 24 auf. Das erste Lager 13 und das zweite Lager 22 sind jeweils als Loslager ausgeführt. Das dritte Lager 23 und das vierte Lager 24 sind jeweils als Festlager ausgeführt. The electric drive unit 1 has a bearing arrangement with four bearings, namely a first bearing 13, a second bearing 22, a third bearing 23 and a fourth bearing 24. The first bearing 13 and the second bearing 22 are each designed as floating bearings. The third bearing 23 and the fourth bearing 24 are each designed as a fixed bearing.
Das erste Lager 13 ist in einer axialen Richtung, nämlich einer Richtung entlang der Drehachse 3 des Rotors 5, genau auf Höhe des ersten Wickelkopfs 7 des Stators 6 auf der Rotorwelle 4 angeordnet. Über das erste Lager 13 sind die Ro torwelle 4 der elektrischen Maschine 2, der Planetenradträger 10 des Unterset zungsgetriebes 9 und somit auch der Differentialkorb 12 des Differentialgetriebes 1 1 gelagert. Die Rotorwelle 4 ist weiterhin über das dritte Lager 23 gelagert, wo bei das dritte Lager 23 in der in Fig. dargestellten Ausführungsvariante der vorlie genden Erfindung auch entfallen könnte, da eine Zentrierung der Rotorwelle 4 unter Last über die Planetenräder 17‘, 17“ erfolgt. The first bearing 13 is arranged in an axial direction, namely a direction along the axis of rotation 3 of the rotor 5, exactly at the level of the first end winding 7 of the stator 6 on the rotor shaft 4. About the first bearing 13, the Ro gate shaft 4 of the electrical machine 2, the planet carrier 10 of the reduction gear 9 and thus also the differential cage 12 of the differential gear 1 1 are mounted. The rotor shaft 4 is also supported via the third bearing 23, where the third bearing 23 in the embodiment of the present invention shown in FIG. Could also be omitted, since the rotor shaft 4 is centered under load via the planet gears 17 ', 17 " .
Das zweite Lager 22 dient als Stützlager zwischen der Rotorwelle 4 und dem Differentialkorb 12. Das zweite Lager 22 ist ebenso auf der Rotorwelle 4 angeord net. Über das zweite Lager 22 sind ebenso die Rotorwelle 4 der elektrischen Ma schine 2, der Planetenradträger 10 des Untersetzungsgetriebes 9 und somit auch der Differentialkorb 12 des Differentialgetriebes 1 1 gelagert. Das erste Lager 13 und das zweite Lager 22 sind jeweils als Nadellager ausgebil det. Wie allgemein bekannt ist ein Nadellager ein Wälzlager, bei dem zwischen einem Innenring (nicht dargestellt) und einem Außenring (nicht dargestellt), im Gegensatz zu der Schmierung in Gleitlagern, rollende Körper den Reibungswider- stand verringern. Der Planetenradträger 10 bzw. der Differentialkorb 12 ist jeweils am Außenring der beiden Lager 13, 22 montiert; die Rotorwelle 4 ist jeweils am Innenring der beiden Lager 13, 22 montiert. The second bearing 22 serves as a support bearing between the rotor shaft 4 and the differential carrier 12. The second bearing 22 is also net angeord on the rotor shaft 4. About the second bearing 22, the rotor shaft 4 of the electrical Ma machine 2, the planetary gear carrier 10 of the reduction gear 9 and thus also the differential cage 12 of the differential gear 1 1 are mounted. The first bearing 13 and the second bearing 22 are each ausgebil det as needle bearings. As is generally known, a needle roller bearing is a roller bearing in which between an inner ring (not shown) and an outer ring (not shown), in contrast to the lubrication in plain bearings, rolling bodies reduce the frictional resistance. The planetary gear carrier 10 and the differential carrier 12 are each mounted on the outer ring of the two bearings 13, 22; the rotor shaft 4 is mounted on the inner ring of the two bearings 13, 22.
Bezuqszeichenliste Reference list
1 Elektrische Antriebseinheit 1 electric drive unit
2 Elektrische Maschine 2 electric machine
3 Drehachse 3 axis of rotation
4 Rotorwelle 4 rotor shaft
5 Rotor 5 rotor
6 Stator 6 stator
7 Erster Wickelkopf 7 First winding head
8 Zweiter Wickelkopf 8 Second winding head
9 Untersetzungsgetriebe 9 reduction gears
10 Planetenradträger 10 planetary gear carriers
1 1 Differentialgetriebe 1 1 differential gear
12 Differentialkorb 12 differential carrier
13 Erstes Lager 13 First camp
14 Erste Stirnseite 14 First face
15 Zweite Stirnseite 15 Second face
16 Sonnenrad 16 sun gear
17 Doppelplanetenrad 17 double planetary gear
17‘ Erstes Planetenrad 17 ‘First planetary gear
17“ Zweites Planetenrad 17 “Second planetary gear
18 Bolzen 18 bolts
19 Ausgleichskegelrad 19 Pinion pinion
20 Abtriebskegelrad 20 output bevel gear
21 Abtriebswelle 21 output shaft
22 Zweites Lager 22 Second camp
23 Drittes Lager 23 Third camp
24 Viertes Lager 24 Fourth camp
25 Gehäuse 25 housing

Claims

Patentansprüche Claims
1. Elektrische Antriebseinheit (1 ) für ein zumindest teilweise elektrifiziertes Kraftfahrzeug umfassend 1. An electric drive unit (1) for an at least partially electrified motor vehicle
eine elektrische Maschine (2), an electric machine (2),
ein Differentialgetriebe (1 1 ), wobei das Differentialgetriebe (1 1 ) in Be zug auf eine Drehachse (3) der elektrischen Maschine (2) im Wesentli chen koaxial zu dieser angeordnet ist und einen Differentialkorb (12) aufweist, a differential gear (1 1), wherein the differential gear (1 1) in Be train to an axis of rotation (3) of the electrical machine (2) is arranged essentially coaxially to this and has a differential cage (12),
ein Untersetzungsgetriebe (9), wobei das Untersetzungsgetriebe (9) als Planetenradgetriebe mit einem Planetenradträger (10) ausgeführt ist, sowie a reduction gear (9), wherein the reduction gear (9) is designed as a planetary gear with a planetary gear carrier (10), and
eine Lageranordnung mit zumindest einem ersten Lager (13) und einem zweiten Lager (22), a bearing arrangement with at least a first bearing (13) and a second bearing (22),
wobei die elektrische Maschine (2) über das Untersetzungsgetriebe (9) antriebswirksam mit dem Differentialgetriebe (1 1 ) verbunden oder verbind bar ist, wobei der Differentialkorb (12) des Differentialgetriebes (1 1 ) fest mit dem Planetenradträger (10) des Untersetzungsgetriebes (9) verbunden ist, wobei sowohl das erste Lager (13) wie auch das zweite Lager (22) auf der Rotorwelle (4) angeordnet sind und über das erste Lager (13) und das zwei te Lager (22) die Rotorwelle (4) der elektrischen Maschine (2), der Plane tenradträger (10) des Untersetzungsgetriebes (9) und somit auch der Diffe rentialkorb (12) des Differentialgetriebes (1 1 ) gelagert sind. wherein the electric machine (2) via the reduction gear (9) is effectively drivingly connected to the differential gear (1 1) or can be connected, the differential cage (12) of the differential gear (1 1) fixed to the planet carrier (10) of the reduction gear (9 ) is connected, both the first bearing (13) and the second bearing (22) are arranged on the rotor shaft (4) and the rotor shaft (4) of the first bearing (13) and the second bearing (22) electrical machine (2), the plane tenradträger (10) of the reduction gear (9) and thus also the differential basket (12) of the differential gear (1 1) are mounted.
2. Elektrische Antriebseinheit (1 ) nach Anspruch 1 , 2. Electric drive unit (1) according to claim 1,
d a d u r c h g e k e n n z e i c h n e t , dass die elektrische Maschine (2) einen um die Drehachse (3) drehbaren, fest auf einer Rotor welle (4) angeordneten Rotor (5) und einen Stator (6) mit stirnseitigen Wick lungsköpfen (7, 8) aufweist, wobei das erste Lager (13) in einer axialen Richtung auf Höhe des dem Differentialgetriebe (11) zugewandten stirnsei tigen Wickelkopfes (7) der elektrischen Maschine (2) angeordnet ist. characterized in that the electrical machine (2) has a rotor (5) which can be rotated about the axis of rotation (3) and is fixedly arranged on a rotor shaft (4) and a stator (6) with end-side winding heads (7, 8), the first bearing (13) is arranged in an axial direction at the level of the differential gear (11) facing stirnsei term winding head (7) of the electrical machine (2).
3. Elektrische Antriebseinheit (1) nach Anspruch 1 oder 2, 3. Electric drive unit (1) according to claim 1 or 2,
d a d u r c h g e k e n n z e i c h n e t , dass das erste Lager (13) und das zweite Lager (22) als Loslager ausgeführt sind. d u r c h g e k e n n n z e i c h n e t that the first bearing (13) and the second bearing (22) are designed as floating bearings.
4. Elektrische Antriebseinheit (1 ) nach Anspruch 1 , 2 oder 3, 4. Electric drive unit (1) according to claim 1, 2 or 3,
d a d u r c h g e k e n n z e i c h n e t , dass das erste Lager (13) und das zweite Lager (23) als Nadellager ausgeführt sind. d a d u r c h e k e n n n z e i c h n e t that the first bearing (13) and the second bearing (23) are designed as needle bearings.
5. Elektrische Antriebseinheit (1) nach einem der Ansprüche 1 bis 4, 5. Electric drive unit (1) according to one of claims 1 to 4,
d a d u r c h g e k e n n z e i c h n e t , dass die elektrische Maschine (2) zumindest im Betrieb direkt mit einem Kühlmittel in Berührung steht. it is noted that the electrical machine (2) is in direct contact with a coolant, at least during operation.
PCT/EP2020/067691 2019-07-19 2020-06-24 Electrical drive unit for an at least partially electrified motor vehicle WO2021013456A1 (en)

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DE102021205164A1 (en) * 2021-05-20 2022-11-24 Zf Friedrichshafen Ag Electric drive for a vehicle
DE102022202910A1 (en) 2022-03-24 2023-09-28 Zf Friedrichshafen Ag Drive device for a vehicle
DE102022110036A1 (en) 2022-04-26 2023-10-26 Schaeffler Technologies AG & Co. KG Electrically operated axle drive train

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