WO2023217564A1 - Système d'entraînement électrique pour véhicule automobile, et procédé d'actionnement dudit système d'entraînement électrique - Google Patents

Système d'entraînement électrique pour véhicule automobile, et procédé d'actionnement dudit système d'entraînement électrique Download PDF

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Publication number
WO2023217564A1
WO2023217564A1 PCT/EP2023/061414 EP2023061414W WO2023217564A1 WO 2023217564 A1 WO2023217564 A1 WO 2023217564A1 EP 2023061414 W EP2023061414 W EP 2023061414W WO 2023217564 A1 WO2023217564 A1 WO 2023217564A1
Authority
WO
WIPO (PCT)
Prior art keywords
drive system
switching element
rotor
torque
output shaft
Prior art date
Application number
PCT/EP2023/061414
Other languages
German (de)
English (en)
Inventor
Peter Hahn
Carsten Gitt
Tobias Schilder
Original Assignee
Mercedes-Benz Group AG
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 Mercedes-Benz Group AG filed Critical Mercedes-Benz Group AG
Publication of WO2023217564A1 publication Critical patent/WO2023217564A1/fr

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Classifications

    • 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
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/10—Differential gearings with gears having orbital motion with orbital spur gears
    • F16H48/11—Differential gearings with gears having orbital motion with orbital spur gears having intermeshing planet 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
    • B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
    • 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
    • F16H48/00—Differential gearings
    • F16H48/36—Differential gearings characterised by intentionally generating speed difference between outputs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/91—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
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/10—Differential gearings with gears having orbital motion with orbital spur gears
    • F16H2048/104—Differential gearings with gears having orbital motion with orbital spur gears characterised by two ring 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
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/10—Differential gearings with gears having orbital motion with orbital spur gears
    • F16H2048/106—Differential gearings with gears having orbital motion with orbital spur gears characterised by two sun 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
    • F16H48/00—Differential gearings
    • F16H48/36—Differential gearings characterised by intentionally generating speed difference between outputs
    • F16H2048/364—Differential gearings characterised by intentionally generating speed difference between outputs using electric or hydraulic motors

Definitions

  • the invention relates to an electric drive system for a motor vehicle, in particular for a motor vehicle, according to the preamble of patent claim 1.
  • the invention further relates to a method for operating such an electric drive system.
  • the US 9 494218 B2 is an engine for driving two driven parts as known to drive a vehicle.
  • DE 10 2019 107 538 A1 discloses a torque distribution transmission, with a first drive shaft, which is connected in a rotationally fixed manner to a first sun gear of a spur gear differential.
  • the object of the present invention is to create an electric drive system and a method for operating such an electric drive system, so that a particularly small installation space requirement of the drive system and a particularly advantageous drive can be realized.
  • a first aspect of the invention relates to an electric drive system, also referred to as an electric drive device or designed as an electric drive device, for a motor vehicle, in particular for a motor vehicle and especially for a passenger car.
  • an electric drive system also referred to as an electric drive device or designed as an electric drive device
  • the motor vehicle in its fully manufactured state has the electric drive system and is driven electrically, in particular purely electrically, by means of the electric drive system can be.
  • the motor vehicle in its fully manufactured state, has at least or exactly two axles, also referred to as vehicle axles, which are arranged one after the other in the longitudinal direction of the vehicle and thus one behind the other.
  • the respective axle of the motor vehicle also referred to as a vehicle, has at least or exactly two vehicle wheels, also referred to as wheels, with, for example, the vehicle wheels of the respective axle being arranged on sides of the motor vehicle that are opposite one another in the transverse direction of the vehicle.
  • the electric drive system for example, the vehicle wheels of at least one of the axles or both axles can be driven, whereby the motor vehicle as a whole can be driven.
  • the vehicle wheels that can be driven by the electric drive system are also referred to as drivable wheels or driven wheels. When we talk about the vehicle wheels or the wheels below, this refers to the vehicle wheels that can be driven by the electric drive system, unless otherwise stated.
  • the electric drive system has a first electric machine which has a first rotor.
  • the first electrical machine has a first stator, by means of which, for example, the first rotor can be driven and thereby rotatable about a first machine axis of rotation relative to the first rotor.
  • the first electric machine can provide first drive torques for driving the vehicle wheels and thus the motor vehicle via the first rotor.
  • the electric drive system also has a second electric machine with a second rotor.
  • the second electrical machine has a second stator, by means of which, for example, the second rotor can be driven and thereby rotated about a second machine axis of rotation relative to the second stator.
  • the second electric machine can provide second drive torque via its second rotor, by means of which the vehicle wheels and thus the motor vehicle can be driven.
  • the machine axes of rotation run parallel to one another, and the machine axes of rotation can be spaced apart from one another.
  • the machine axes of rotation coincide, so that the electrical machines can, for example, be arranged coaxially with one another.
  • the electric drive system also has a coupling gear, which has two output shafts, namely a first output shaft and a second output shaft.
  • the output shafts are designed to transfer output torques from the coupling gear.
  • the coupling gear can provide the output torque via its output shafts.
  • the first output shaft is designed to receive the first of the output torques from the coupling gear to discharge
  • the second output shaft is designed to discharge second of the output torques from the coupling gear.
  • the respective first output torque and/or the respective second output torque result from the respective first drive torque and/or from the respective second drive torque.
  • the coupling gear has a first planetary gear set, which has a first element, a second element and a third element.
  • the second element is, in particular permanently, non-rotatably connected to the second output shaft, that is, coupled.
  • the linkage also includes a second planetary gear set having a fourth element, a fifth element and a sixth element.
  • the fifth element is, in particular permanently, connected to the second element in a rotationally fixed manner.
  • the first rotor is coupled to the fourth element, in particular torque-transmitting and, in particular, rotationally fixed, in such a way that the first drive torques provided or able to be provided by the first electric machine via the first rotor are introduced to the fourth element or into the coupling gear via the fourth element can, therefore, be initiated.
  • the first rotor is coupled to the fourth element, in particular in a torque-transmitting manner and in particular in a rotationally fixed manner, that is to say connected in such a way that the respective first drive torque, starting from the first electric machine or from the first rotor, is transmitted to the fourth element or can be introduced into the coupling gear via the fourth element.
  • the first rotor can be permanently connected to the fourth element in a torque-transmitting manner, in particular permanently in a rotationally fixed manner, that is, coupled.
  • the first element, the second element and the third element are gear elements of the first planetary gear set or are also referred to as gear elements of the first planetary gear set.
  • the first of the gear elements is designed as a first sun gear
  • a second of the gear elements is designed as a first planet carrier
  • a third of the gear elements is designed as a first ring gear of the first planetary gear set.
  • the fourth element, the fifth element and the sixth element are also collectively referred to as components of the second planetary gear set.
  • a first of the components is a second sun gear
  • a second of the components is a second planet carrier
  • a third of the components is a second ring gear of the second planetary gear set.
  • the planet carriers are also known as webs.
  • the drive system has a housing, for example the first planetary gear set and/or the second planetary gear set can be arranged at least partially in the housing.
  • the respective gear element can, for example, be rotated about a first planetary gear set rotation axis relative to the housing.
  • the respective component can be rotated about a second planetary gear set rotation axis relative to the housing.
  • the planetary gear sets are arranged coaxially with one another, so that the planetary gear set rotation axes preferably coincide.
  • the respective planetary gear set rotation axis runs, for example, parallel to the respective machine rotation axis and can in particular be spaced from the respective machine rotation axis. Furthermore, it is conceivable that the respective planetary gear set rotation axis coincides with the respective machine rotation axis, so that preferably the respective planetary gear set can be arranged coaxially to the respective electrical machine.
  • the feature that two components such as the second output shaft and the second element or the second element and the fifth element are connected to one another in a rotationally fixed manner means that the components connected to one another in a rotationally fixed manner are arranged coaxially with one another and are in particular when the components are driven, rotate together or simultaneously about a component rotation axis common to the components, such as the first planetary gear set rotation axis or the second planetary gear set rotation axis, with the same angular velocity, in particular relative to the housing.
  • the feature that two components are connected to one another in a torque-transmitting manner is to be understood as meaning that the components are coupled or connected to one another in such a way that torques can be transmitted between the components, whereby when the components are connected to one another in a rotationally fixed manner, the components also transmit torque are connected to each other.
  • the feature that two components are permanently connected to each other in a torque-transmitting manner means that a switching element is not provided which can be switched between a coupling state that connects the components in a torque-transmitting manner and a decoupling state in which no torque can be transmitted between the components. but the components are always or always and therefore permanently torque-transmitting, that is, connected to one another in such a way that torque can be transmitted between the components.
  • one of the components is different from the other Component can be driven and vice versa.
  • the feature that two components are permanently connected to one another in a rotational manner means that a switching element is not provided which can be switched between a coupling state that connects the components to one another in a rotational manner and a decoupling state in which the components are decoupled from one another and relative to one another are rotatable, in particular about the component rotation axis, so that no torques can be transmitted between the components, but rather the components are always connected or coupled to one another in a permanently rotated manner.
  • rotation test means that two elements, in particular rotatably mounted, are connected to one another in a rotationally fixed manner when they are arranged coaxially to one another and are connected to one another in such a way that they rotate at the same angular velocity, in particular around the component rotation axis.
  • the respective gear element is, in particular permanently, connected in a rotationally fixed manner to a respective shaft of the first planetary gear set or also forms this respective shaft.
  • the respective component is, in particular permanently, connected in a rotationally fixed manner to a respective shaft of the second planetary gear set or that it also forms this respective shaft.
  • a first switching element which is designed or intended to connect the first output shaft to the third element in a rotationally fixed manner.
  • the first output shaft can be connected to the third element in a rotationally fixed manner by means of the first switching element.
  • the first switching element can be switched between a first coupling state and a first decoupling state. In the first coupling state, the first output shaft is connected to the third element in a rotationally fixed manner by means of the first switching element.
  • the first switching element releases the first output shaft and the third element for a relative rotation between the first output shaft and the third element, in particular about the first planetary gear set rotation axis, so that in the first decoupling state the first output shaft and the third element in particular about the first Planetary gear set rotation axis can be rotated relative to each other.
  • the first switching element can, in particular relative to the housing and/or translationally, between at least one first coupling position and at least one first decoupling position causing the first decoupling state can be moved.
  • a second switching element is also provided, which is designed or intended to connect the first output shaft to the first element in a rotationally fixed manner.
  • the second switching element can be switched between a second coupling state and a second decoupling state.
  • the first output shaft is connected to the first element in a rotationally fixed manner by means of the second switching element.
  • the second decoupling state the first output shaft and the first element are rotatable relative to one another, in particular about the first planetary gear set rotation axis.
  • the second switching element can be moved, in particular translationally and/or relative to the housing, between at least one second coupling position causing the second coupling state and at least one second coupling position causing the second decoupling state.
  • a third switching element is provided, which is designed or intended to couple the second rotor to the sixth element, in particular in a torque-transmitting manner and in particular in a rotationally fixed manner, in such a way that the switches provided or able to be provided by the second electrical machine via the second rotor second drive torques can be introduced on the sixth element or via the sixth element into the coupling gear, and can therefore be initiated.
  • the third switching element is designed to couple the second rotor, in particular in a torque-transmitting and most particularly rotationally fixed manner, to the sixth element, that is to say to connect it, in such a way that the respective second drive torque, starting from the second electrical machine or from the second rotor, on the sixth element or via the sixth element can be introduced into the coupling gear.
  • the third switching element can be switched between a third coupling state and a third decoupling state. In the third coupling state, the second rotor is connected to the sixth element in a torque-transmitting manner, in particular in a rotationally fixed manner, by means of the third switching element.
  • the second rotor is decoupled from the sixth element, so that no torques can be transmitted between the second rotor and the sixth element via the third switching element.
  • torques can be transmitted via the third switching element between the second rotor and the sixth element.
  • the third switching element can be moved, in particular translationally and/or relative to the housing, between at least one third decoupling position causing the third decoupling state and at least one third coupling position causing the third coupling state.
  • the second element is the first planetary carrier and the fifth element is the second planetary carrier.
  • first planet gears and second planet gears are rotatably held, that is arranged, on the second element.
  • the first planet gears mesh, in particular permanently, with a first toothing of the first element.
  • the second planet gears mesh, in particular permanently, with a third toothing of the third element.
  • one of the first planet gears meshes, in particular precisely, with a respective one of the second planet gears, in particular permanently.
  • third planet gears are rotatably held, that is, arranged, on the fifth element.
  • the third planet gears mesh, in particular permanently, with a fourth toothing of the fourth element and with a sixth toothing of the sixth element.
  • one of the second planet gears meshes, in particular precisely, with a respective one of the third planet gears, in particular permanently.
  • the third planet gears do not mesh with the first planet gears.
  • the first planet gears do not mesh with the third toothing, not with the fourth toothing and not with the sixth toothing.
  • the second planet gears do not mesh with the first toothing, not with the fourth toothing and not with the sixth toothing.
  • the third planet gears do not mesh with the first toothing and not with the third toothing.
  • the second planetary gears are provided in addition to the first planetary gears, and most preferably the third planetary gears are provided in addition to the first planetary gears and in addition to the second planetary gears.
  • a first transmission stage is provided, which is arranged downstream of the first output shaft and downstream of the coupling gear and in particular upstream of a first of the vehicle wheels with respect to a first torque flow, for example the respective first output torque along the first torque flow the coupling gear and the first output shaft can be transmitted to or on the first vehicle wheel via the first gear ratio, so that the first gear ratio is arranged in the first torque flow and downstream of the first output shaft and upstream of the first vehicle wheel.
  • a second transmission stage is preferably provided, which is arranged with respect to a second torque flow downstream of the second output shaft and upstream of the coupling gear and in particular upstream of the second vehicle wheel, for example along the second torque flow the respective second output torque from the coupling gear and the second output shaft via the second gear ratio can be transferred to or to the second vehicle wheel.
  • the second transmission stage is arranged in the second torque flow and upstream of the second vehicle wheel and downstream of the second output shaft.
  • the first switching element is viewed in the axial direction of the coupling gear and thus along the respective planetary gear set rotation axis and the second switching element is arranged between the second gear ratio and the coupling gear, the third switching element being arranged between the coupling gear and the first gear ratio when viewed in the axial direction of the coupling gear.
  • the “axial direction” means the direction of an axis of rotation of the planetary gear sets.
  • the first planetary gear set and the second planetary gear set are arranged coaxially with one another.
  • the planetary gear sets of the coupling gear i.e. the first planetary gear set and the second planetary gear set as well as the two electrical machines, are all arranged coaxially to one another, so that the rotors of the electrical machines also rotate about the same axis of rotation as the two planetary gear sets mentioned. If terms such as “axial” or “axial “between” are used, these terms always refer to the axis of rotation of the planetary gear sets of the coupling gear mentioned here.
  • the first element as the first sun gear, the third element as the first ring gear, the fourth element as the second sun gear and the sixth element is designed as the second ring gear.
  • a further embodiment is characterized in that the third switching element is designed to couple the second rotor to the sixth element in a rotationally fixed manner.
  • the second rotor can be coupled to the sixth element in a rotationally fixed manner, that is to say can be connected, by means of the third switching element.
  • a second aspect of the invention relates to a method for operating an electric drive system according to the first aspect of the invention.
  • Advantages and advantageous refinements of the first aspect of the invention are to be viewed as advantages and advantageous refinements of the second aspect of the invention and vice versa.
  • the first switching element is closed, the second switching element is open and the third Switching element are closed.
  • the first switching element is open, the second switching element is closed and the third switching element is open for one or an efficient operation of the drive system.
  • a further embodiment is characterized in that for a second torque shift operation or in a second torque shift operation, the first switching element is open, the second switching element is closed and the third switching element is closed.
  • ordinal words referred to as ordinals such as "first”, “first”, “second”, “second”, etc., are not necessarily used to indicate or imply a number or set of elements, but rather to uniquely also be able to reference terms to which the ordinal number words are assigned or to which the ordinal number words refer.
  • both electric machines in particular via their rotors, provide significant torque, in particular in the form of the drive torques, for propulsion, that is to say to drive the motor vehicle, in particular to the same extent, so that, for example first drive torque corresponds to the second drive torque, or the first drive torque or the second drive torque are different from each other.
  • the electrical machines can be of the same strength, or the electrical machines can be of different strengths.
  • the second torque shift operation based on the two electrical machines, predominantly or essentially only one of the electrical machines, in particular the first electrical machine, drives the motor vehicle, by which is meant that the one electrical machine drives the motor vehicle predominantly or more powerfully than the other electric machine, whose torque contribution to driving the motor vehicle can be 0 or greater than 0, but can be neglected, in particular in comparison to the one electric machine, with a distribution or division of the one electric machine via the rotor the drive torque provided by an electric machine on the vehicle wheels, that is in particular on the output shafts and via these on the vehicle wheels, depends on a torque ratio and / or speed ratio of the two electric machines to one another.
  • the other electric machine specifies the distribution or division of the drive torque.
  • more torque i.e. a greater torque
  • more torque can be transmitted to one of the vehicle wheels than to the other vehicle wheel.
  • only one electric machine in particular the first electric machine, drives the motor vehicle, in particular the vehicle wheels, or the one electric machine drives the vehicle wheels significantly stronger than the other electric machine, with the drive torque provided by the one electric machine being distributed to the two vehicle wheels through appropriate operation of the other electric machine, in particular the second electric machine, Therefore, by, in particular, correspondingly operating the other electric machine, a distribution of the drive torque provided by the one electric machine, in particular by the rotor of the one electric machine, to the vehicle wheels can be adjusted, that is, varied.
  • the other electric machine therefore has no significant torque contribution to drive the motor vehicle.
  • a torque shift or torque distribution can be realized that a distribution or division of the drive torque that can be provided or provided by the one electric machine via the rotor of the one electric machine to the vehicle wheels by operating of the other electrical machine varies, that is, can be adjusted, in particular by the other electrical machine either driving or braking the coupling gear.
  • the coupling transmission has, for example, a basic distribution according to which a total torque introduced into the coupling transmission is divided or distributed to the output shafts and via these to the vehicle wheels.
  • the basic distribution is defined, i.e. predetermined, by a mechanical design of the coupling gear.
  • the total torque results, for example, from the respective, first drive torque and/or from the respective, second drive torque, wherein, for example, the total torque can result in particular from the respective, first drive torque and from the respective, second drive torque when the second rotor produces the respective, second Drive torque and, in particular at the same time, the first rotor provides the respective first drive torque and the first drive torque and the second drive torque are introduced into the coupling gear, in particular simultaneously.
  • the coupling transmission can be influenced in such a way that, for example, the respective drive torque provided by the one electric machine or the total torque is not or not only according to the basic distribution, but according to one of the basic distribution different distribution to the output shafts and via these to the vehicle wheels, for example by varying the operation of the other electric machine, that is, for example by varying one of the other electric machine, in particular the rotor of the other electric Machine, torque provided for driving or braking the coupling gear, the distribution mentioned can be varied.
  • This torque shift is particularly advantageous when the motor vehicle is cornering, since, for example, a greater torque can be assigned to the vehicle wheel on the outside of the curve than to the vehicle wheel on the inside of the curve, in order, for example, to be able to advantageously accelerate the motor vehicle out of a curve.
  • the invention thus enables the realization of a particularly high level of performance, particularly with regard to high transverse dynamics, in particular with a high efficiency of the drive system at the same time. Furthermore, the invention enables a particularly compact design of the electric drive system.
  • efficiency mode for example, in relation to the electrical machines, only one of the electrical machines, in particular the first electrical machine, drives the motor vehicle or the vehicle wheels, in particular while the vehicle wheels are not driven by the other electrical machines in particular while the other electrical machine neither drives nor brakes the coupling gear and most preferably while the other electrical machine is deactivated.
  • the coupling gear works here as a classic differential, in particular with a 50:50 torque distribution, especially in curves, whereby the coupling gear, in particular like a differential, still allows different speeds of the vehicle wheels, so that the vehicle wheel on the outside of the curve rotates or can rotate at a higher speed than the vehicle wheel on the inside of the curve.
  • Boost operation of the drive system is also conceivable, with boost operation also being referred to as support operation.
  • a fourth switching element can be provided, by means of which the first rotor can be connected to the second rotor in a torque-transmitting manner, in particular in a rotationally fixed manner.
  • the fourth switching element can be switched between a fourth coupling state and a fourth decoupling state. In the fourth coupling state, the first rotor is connected to the second rotor in a rotationally fixed manner by means of the fourth switching element.
  • the rotors and in particular the machine axes of rotation are in the fourth decoupling state rotatable relative to each other, so that, in particular in the fourth decoupling state, no torques can be transmitted between the rotors via the fourth switching elements.
  • the fourth switching element can be moved, in particular translationally and/or relative to the housing, between at least one fourth coupling position causing the fourth coupling state and at least one fourth decoupling position causing the fourth decoupling state.
  • the second switching element and the fourth switching element are closed, while the first switching element and the third switching element are open, in particular as in efficiency operation, but then the vehicle wheels or the output shafts are driven by both electric machines so that both electric machines make a significant torque contribution to driving the output shaft and thus the vehicle wheels and the motor vehicle.
  • a classic differential function in particular of the coupling gear, is provided, in particular with a 50:50 torque distribution between the two vehicle wheels or output shafts.
  • FIG. 1 shows a schematic representation of a first embodiment of an electric drive system for a motor vehicle
  • FIG. 2 is a schematic representation of a second embodiment of the electric drive system
  • FIG. 3 shows a switching table to illustrate different operations of the electric drive system, also referred to as modes or operating modes; and
  • Fig. 4 is a schematic representation of a third embodiment of an electric drive system.
  • Fig. 1 shows a schematic representation of a first embodiment of an electric drive system 10 for a motor vehicle, also simply referred to as a vehicle, which is preferably designed as a motor vehicle, in particular as a passenger car.
  • the motor vehicle has, for example, at least or exactly two vehicle axles, which are arranged one after the other in the longitudinal direction of the vehicle and thus one behind the other, also simply referred to as axles.
  • One of the vehicle axles can be seen in FIG. 1 and is designated 12.
  • the respective vehicle axle has at least or exactly two vehicle wheels, also simply referred to as wheels.
  • the vehicle wheels of the vehicle axle 12 can be seen in FIG. 1 and are designated 14 and 16.
  • the vehicle wheels 14 and 16 are arranged on sides of the motor vehicle that are opposite one another in the transverse direction of the vehicle.
  • the vehicle wheels 14 and 16 are ground contact elements via which the motor vehicle can be supported or supported downwards on a ground in the vertical direction of the vehicle. If the motor vehicle is driven along the ground while it is supported on the ground in the vertical direction of the vehicle via the ground contact elements, the vehicle wheels 14 and 16 roll, in particular directly, on the ground.
  • the electric drive system 10 has a first electric machine 18, which has a first stator 20 and a first rotor 22.
  • the rotor 22 can be driven by means of the stator 20 and can therefore be rotated about a machine axis of rotation relative to the stator 20 and relative to a housing 24 of the drive system 10, which is shown particularly schematically in FIG.
  • the electric machine 18 can provide respective first drive torques via its rotor 22 for driving the vehicle wheels 14 and 16 and thus the motor vehicle.
  • the electric drive system 10 also includes a second electric machine 25, which has a second stator 26 and a second rotor 28. By means of the stator 26, the rotor 28 can be driven and thereby rotated about a second machine axis of rotation relative to the stator 26 and relative to the housing 24.
  • the electric machine 25 can be over their second rotor 28 provide respective second drive torques for driving the vehicle wheels 14 and 16 and thus the motor vehicle.
  • the electrical machines 18 and 25 are arranged coaxially with one another, so that the machine axes of rotation coincide.
  • the drive system 10 also includes a coupling gear 30, which can have a central superposition unit or can be designed as a central superposition unit.
  • the coupling gear 30 has a first output shaft 33 and a second output shaft 35.
  • First output torques can be transferred from the coupling gear 30 via the output shaft 33, so that the coupling gear 30 can provide the first output torques via the first output shaft 33.
  • Second output torques can be transferred from the coupling gear 30 via the second output shaft 35, which can thus provide the second output torques via the second output shaft 35.
  • the respective first output torque results from the respective first drive torque and/or from the respective second drive torque
  • the respective second output torque results, for example, from the respective first drive torque and/or from the respective second drive torque.
  • the vehicle wheel 14 can be driven by the output shaft 33 and thus via the output shaft 33 by the coupling gear 30 and via this by the respective electrical machine 18, 25.
  • the vehicle wheel 16 can be driven by the output shaft 35 and thus via the output shaft 35 by the coupling gear 30 and via this by the respective electrical machine 18, 25.
  • the coupling gear 30, in particular the superposition unit has a first planetary gear set 32 and a second planetary gear set 34.
  • the planetary gear set 32 has a first element 36, a second element 38 and a third element 40.
  • the planetary gear set 34 has a fourth element 42, a fifth element 44 and a sixth element 46.
  • the element 36 is a first sun gear
  • the element 38 is a first planet carrier, which is also referred to as the first web
  • the third element 40 is a first ring gear.
  • the fourth element 42 is a second sun gear
  • the fifth element 44 is a second planet carrier, which is also referred to as a second web
  • the sixth element 46 is a second ring gear.
  • the planetary gear sets 32 and 34 are arranged coaxially with one another.
  • the fifth element 44 is, in particular permanently, non-rotatably connected to the second element 38, that is, coupled.
  • the first rotor 22 is coupled to the fourth element 42 in such a way that the power from the first electrical machine 18 via the first Rotor 22 provided or available, first drive torques on the fourth element 42, that is, via the fourth element 42, into which coupling gear 30 can be introduced, and can therefore be initiated.
  • the rotor 22 is connected, in particular permanently, to the fourth element 42 in a rotationally fixed manner.
  • the second output shaft 35 is, in particular permanently, coupled in a rotationally fixed manner to the second element 38 and thus to the fifth element 44, that is to say connected.
  • the respective electrical machine 18, 25 is designed as an axial flux machine (AFM).
  • the respective rotor 22, 28 comprises two rotor elements, also referred to as rotor disks or designed as rotor disks, which are spaced apart from one another in the axial direction of the respective electrical machine 18, 25, with the respective stator 20, 26 in the axial direction of the respective electrical Machine 18, 25 is arranged between the respective stator elements of the respective electrical machine 18, 25.
  • the electric drive system 10 has a first switching element SE1, which is designed to connect the first output shaft 33 to the third element 40 in a rotationally fixed manner.
  • the electric drive system 10 also includes a second switching element SE2, which is designed to connect the first output shaft 33 to the first element 36 in a rotationally fixed manner.
  • a first switching part 48 which is designed, for example, as a sliding sleeve and is common to the switching elements SE1 and SE2, is provided, which can be switched between a first state and a second state.
  • the first switching part 48 can be moved, in particular relative to the housing 24 and/or translationally, between at least one first position causing the first state and at least one second position causing the second state.
  • the first state is a first coupling state
  • the second state is a second coupling state which is accompanied by a first decoupling state, the first coupling state being accompanied by a second decoupling state.
  • the output shaft 33 and the third element 40 are connected to one another in a rotationally fixed manner by means of the first switching element SE1 and by means of the first switching part 48, so that in particular torques via the switching element SE1 and the first switching part 48 between the output shaft 33 and the third element 40 are transferable.
  • the output shaft 33 and the element 36 are connected to one another in a rotationally fixed manner by means of the second switching element SE2 and by means of the switching part 48, so that via the switching element SE2 and the first switching part 48 torques can be transmitted between the output shaft 33 and the element 36.
  • the first decoupling state second state
  • the output shaft 33 and the third element 40 are decoupled from one another, so that the output shaft 33 and the third element 40 can be rotated relative to one another about a planetary gear set rotation axis that is common to the planetary gear sets 32 and 34 and so via the switching element SE1 and the first switching part 48 no torques can be transmitted between the output shaft 33 and the third element 40.
  • the output shaft 33 and the first element 36 are decoupled from one another, so that the output shaft 33 and the first element 36 are rotatable relative to one another about the planetary gear set rotation axis and so that no torques are transmitted between the output shaft 33 and the first element 36 the switching element SE2 and the first switching part 48 can be transferred.
  • the electric drive system 10 also includes a third switching element SE3, which is designed to couple the second rotor 28 to the sixth element 46 in such a way that the second drive torques provided or able to be provided by the second electric machine 25 via the second rotor 28 are transmitted to the second rotor 28 sixth element 46 or via the sixth element 46 can be introduced into the coupling gear 30.
  • a second switching part 49 is provided, which can be switched between a third coupling state and a third decoupling state.
  • the second switching part 49 is movable, in particular relative to the housing 24 and/or translationally, between at least one third coupling position causing the third coupling state and at least one third decoupling position causing the third decoupling state.
  • the rotor 28 is torque-transmitting, in particular rotating, connected to the sixth element 46 by means of the second switching part 49 and by means of the switching element SE3, so that torques are transmitted between the sixth element 46 and the rotor 28 via the switching element SE3 and the second switching part 49 can be transferred.
  • the sixth element 46 and the rotor 28 are decoupled from one another, so that no torque can be transmitted between the rotor 28 and the element 46 via the switching element SE3 and the second switching part 49 and so that in particular the sixth element 46 and the rotor 28 can be rotated relative to one another about the planetary gear set rotation axis.
  • first planet gears 50 and second planet gears 52 are each rotatably held on the second element 38.
  • the first planet gears 50 mesh, in particular permanently, with a first toothing of the first element 36.
  • the second planet gears 52 mesh, in particular permanently, with a third toothing of the third element 40.
  • each, in particular precisely, one of the first planet gears 50 meshes, in particular precisely, with a respective one of the second planet gears 52, in particular permanently .
  • Third planet gears 54 are rotatably held on the fifth element 44, the third planet gears 54 meshing, in particular permanently, with a fourth toothing of the fourth element 42 and with a sixth toothing of the sixth element 46.
  • one of the second planet gears 52 meshes, in particular precisely, with a respective one of the third planet gears 54, in particular permanently.
  • the first planetary gears 50 or the third planetary gears 54 can be stepped planetary gears. If the first ring gear (third element 40) has the same diameter or the same number of teeth as the second ring gear (sixth element 46), then the first planetary gears 50 and the third planetary gears 54 are each designed as unstepped planetary gears. If the first ring gear has a different diameter or a different number of teeth than the second ring gear, then either the first planet gears 50 are stepped and the third planet gears 54 are unstepped or vice versa.
  • the drive system 10 has a first transmission stage 56, which with regard to a first torque flow, along which or via which the respective first output torque can be transferred from the first output shaft 33 to the first vehicle wheel 14, downstream of the first output shaft 33 and downstream of the coupling gear 30 and is arranged upstream of the vehicle wheel 14 in the first torque flow.
  • the drive system 10 has a second transmission stage 58, which, with regard to a second torque flow, via which or along which the respective second output torque can be transferred from the output shaft 35 to the second vehicle wheel 16, downstream of the second output shaft 35 and downstream of the coupling gear 30 and is arranged upstream of the second vehicle wheel 16 in the second torque flow.
  • the respective transmission stage 56, 58 is designed as a respective third planetary gear set, which has a respective seventh element 60, a respective eighth element 62 and a respective ninth element 64.
  • the elements 60, 62 and 64 are also referred to as transmission parts, with a first of the transmission parts being, for example, a third sun gear, a second of the transmission parts being a third planet carrier and a third of the transmission parts being a third ring gear.
  • element 60 is the third sun gear
  • respective further planet gears 66 of the respective transmission stage 56, 58 are rotatably arranged, that is, held, with the respective planet gear 66 meshing simultaneously with the respective element 60 and the respective element 64.
  • the first output shaft 33 is, in particular permanently, rotationally connected to the element 60 of the transmission stage 56
  • the output shaft 35 is, in particular permanently, rotationally connected to the first element 60 of the transmission stage 58, that is, coupled.
  • the switching elements SE2 and SE1 are arranged between the first transmission stage 56 and the coupling gear 30 in the axial direction of the coupling gear 30 and thus along the planetary gear set rotation axis, with the switching element SE3 between the coupling gear 30 and the coupling gear 30 when viewed in the axial direction of the coupling gear 30 second translation stage 58 is arranged.
  • Fig. 2 shows a second embodiment.
  • the second embodiment differs from the first embodiment in particular in that, viewed in the axial direction of the coupling gear 30 and thus along the planetary gear set rotation axis, the first switching element SE1 and the second switching element SE2 are arranged between the second gear ratio 58 and the coupling gear 30, the third switching element SE3, viewed in the axial direction of the coupling gear 30, is arranged between the coupling gear 30 and the first transmission stage 56.
  • Fig. 3 shows a switching table, which is used to illustrate different operations A, B and C of the drive system 10, also referred to as modes or operating modes.
  • operation A the first switching element SE1 is closed, the second switching element SE2 is open and the third switching element SE3 is closed.
  • the first switching element SE1 is open, the second switching element SE2 is closed and the third switching element SE3 is open.
  • operation C the first switching element SE1 is open, the second switching element SE2 is closed and the third switching element SE3 is closed.
  • operation A is a first torque shift operation, which is also referred to as a first torque shift operation.
  • company B is an efficient company.
  • operation C for example, is a second torque shift operation, which is also referred to as a second torque shift operation.
  • FIG. 4 shows a schematic representation of a third embodiment of an electric drive system 10.
  • the third embodiment differs from the first embodiment shown in FIG. 1 only in two respects:
  • the transmission stages 56, 58 in the third embodiment are arranged upstream of the coupling gear 30 with regard to a torque flow emanating from the electric machines 18, 25;
  • a fourth switching element SE4 is additionally provided, by means of which the first rotor 22 can be coupled to the second rotor 28, the fourth switching element SE4 being arranged upstream of the coupling gear with regard to the torque flow emanating from the electric machines 18, 25.
  • the second rotor 28 is connected to the seventh element 60 of the first transmission stage 56 in a rotationally fixed manner.
  • the eighth element 62 of the first transmission stage 56 can be connected in a rotationally fixed manner to the sixth element 46 by means of the third switching element SE3.
  • the first transmission stage 56 is advantageously arranged axially between the second electrical machine 28 and the coupling gear 30.
  • the first rotor 22 is connected in a rotationally fixed manner to the seventh element 60 of the second transmission stage 58, with the eighth element 62 of the second transmission stage 58 being connected in a rotationally fixed manner to the fourth element 42.
  • the first rotor 22 can be connected to the second rotor 28 in a rotationally fixed manner.
  • both electrical machines 18, 25 can simultaneously introduce their power into the coupling gear 30 via the fourth element 42.
  • a third switching part 68 is assigned to the fourth switching element SE4.
  • the fifth element 44 is coupled, in particular in a rotationally fixed manner, to the second vehicle wheel 16 without an additional intermediate transmission stage.
  • the first vehicle wheel 14 can be coupled, in particular in a rotationally fixed manner, to the third element 40 by means of the first switching element SE1 without a further intermediate transmission stage.
  • the first one is Vehicle wheel 14 can be coupled to the first element 36, in particular in rotation, by means of the second switching element SE2 without a further intermediate gear ratio.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

La présente invention concerne un système d'entraînement électrique (10) comprenant une première machine électrique (18) dotée d'un premier rotor (22), une seconde machine électrique (25) dotée d'un second rotor (28), et un mécanisme d'accouplement (30) qui présente deux arbres de sortie (33, 35), à savoir un premier arbre de sortie (33) et un second arbre de sortie (35), lesdits arbres de sortie étant conçus pour fournir des couples de sortie à partir du mécanisme d'accouplement (30). Un premier train planétaire (32) est prévu, présentant un premier élément (36), un deuxième élément (38) solidaire en rotation du second arbre de sortie (35), et un troisième élément (40), et un second train planétaire (34) est prévu, présentant un quatrième élément (42), un cinquième élément (44) solidaire en rotation du deuxième élément (38), et un sixième élément (46). Le premier rotor (22) est accouplé au quatrième élément (42) de telle sorte que des premiers couples d'entraînement fournis par la première machine électrique (18) peuvent être introduits dans le mécanisme d'accouplement (30) au niveau du quatrième élément (42).
PCT/EP2023/061414 2022-05-09 2023-04-28 Système d'entraînement électrique pour véhicule automobile, et procédé d'actionnement dudit système d'entraînement électrique WO2023217564A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022001622.2 2022-05-09
DE102022001622.2A DE102022001622B4 (de) 2022-05-09 2022-05-09 Elektrisches Antriebssystem für ein Kraftfahrzeug sowie Verfahren zum Betreiben eines solchen elektrischen Antriebssystems

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WO2023217564A1 true WO2023217564A1 (fr) 2023-11-16

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9494218B2 (en) 2012-08-01 2016-11-15 Honda Motor Co., Ltd. Power plant
DE102019107538A1 (de) 2019-03-25 2020-10-01 Schaeffler Technologies AG & Co. KG Torque-Vectoring-Getriebe für ein Kraftfahrzeug

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9494218B2 (en) 2012-08-01 2016-11-15 Honda Motor Co., Ltd. Power plant
DE102019107538A1 (de) 2019-03-25 2020-10-01 Schaeffler Technologies AG & Co. KG Torque-Vectoring-Getriebe für ein Kraftfahrzeug

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DE102022001622A1 (de) 2023-11-09

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