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DE-102024003668-A1 - Electric drive system for a motor vehicle as well as motor vehicle

DE102024003668A1DE 102024003668 A1DE102024003668 A1DE 102024003668A1DE-102024003668-A1

Abstract

The invention relates to an electric drive system (10) for a motor vehicle, comprising a first electric machine (18) having a first rotor (20); a first transmission (28) having a first input shaft (30) and a first output shaft (32) non-rotatably connected to the first rotor (20); a first friction clutch (34) having a first input side (36) and a first output side (38) that is non-rotatably connected to or connectable to the first output shaft (32); and a second friction clutch (40) having a second input side (42) and a second output side (44); wherein a second electric machine (46) having a second rotor (48); a second transmission (52) having a second input shaft (54) and a second output shaft (56); and a first freewheel clutch (FK1) configured to non-rotatably connect the second output shaft (56) to the second input side (42).

Inventors

  • Krutin Raiani
  • Mathias Scheel

Assignees

  • Mercedes-Benz Group AG

Dates

Publication Date
20260513
Application Date
20241108

Claims (10)

  1. Electric drive system (10) for a motor vehicle, comprising: - a first electric machine (18) comprising a first rotor (20); - a first transmission (28) comprising a first input shaft (30) and a first output shaft (32) fixedly connected to the first rotor (20); - a first friction clutch (34) comprising a first input side (36) and a first output side (38) fixedly connected or connectable to the first output shaft (32); and - a second friction clutch (40) comprising a second input side (42) and a second output side (44); characterized by : - a second electric machine (46) comprising a second rotor (48); - a second transmission (52) comprising a second input shaft (54) and a second output shaft (56); and - a first freewheel clutch (FK1) designed to connect the second output shaft (56) to the second input side (42) in a rotationally fixed manner.
  2. Electric drive system (10) according to Claim 1 , characterized in that: - the first transmission (28) is designed as a first planetary gear arranged coaxially to the first rotor (20); - the second transmission (52) is designed as a second planetary gear arranged coaxially to the second rotor (48) and coaxially to the first rotor (20); - along an axis of rotation (26) the second friction clutch (40), the first freewheel clutch (FK1), the second transmission (52) and the second rotor (48) are arranged in the following order: the second friction clutch (40) - the first freewheel clutch (FK1) - the second transmission (52) - the second rotor (48).
  3. Electric drive system (10) according to Claim 1 or 2 , characterized by a second freewheel clutch (FK2) which is designed to connect the first output shaft (32) to the first input side (36) in a rotationally fixed manner.
  4. Electric drive system (10) according to one of the preceding claims, characterized by a connecting shaft (74) which is designed to connect the first output shaft (32) to the second input side (42) in a rotationally fixed manner.
  5. Electric drive system (10) according to Claim 4 , characterized in that: - the second friction clutch (40) is arranged on an axial side (S1) of the first rotor (20) facing away from the first transmission gear (28); and - the connecting shaft (74) is arranged axially overlapping with the first rotor (20) and the second rotor (48) and radially inside the first rotor (20) and the second rotor (48).
  6. Electric drive system (10) according to Claim 4 or 5 , characterized by a third freewheel clutch (FK3) which is designed to connect the first input side (36) to the connecting shaft (74) in a rotationally fixed manner.
  7. Electric drive system (10) according to one of the Claims 4 until 6 , characterized by a fourth freewheel clutch (FK4) designed to connect the connecting shaft (74) to the second input side (42) in a rotationally fixed manner.
  8. Electric drive system (10) according to one of the preceding claims, characterized by a parking lock wheel (76) which is non-rotatably connected to the first rotor (20) and is arranged axially between the first rotor (20) and the first transmission gear (28).
  9. Electric drive system (10) according to one of the preceding claims, characterized by a braking device which is designed to connect the first input side (36) to a housing (24) of the electric drive system (10) in a rotationally fixed manner.
  10. Motor vehicle, with an electric drive system (10) according to one of the preceding claims.

Description

The invention relates to an electric drive system for a motor vehicle, in particular for a car, according to the preamble of claim 1. Furthermore, the invention relates to a motor vehicle, in particular a car, with such an electric drive system. The DE 10 2022 133 317 A1 , the DE 10 2022 133 318 A1 and the DE 10 2022 133 319 A1 integrally designed electric axle drive devices are known. The object of the present invention is to create an electric drive system for a motor vehicle and a motor vehicle with such an electric drive system, in such a way that a particularly high performance and a particularly efficient operation of the electric drive system can be achieved in a particularly space-saving manner. This problem is solved by an electric drive system with the features of claim 1 and by a motor vehicle with the features of claim 10. Advantageous embodiments with expedient further developments of the invention are specified in the remaining claims. A first aspect of the invention relates to an electric drive system, also referred to as an electric drive unit or electric drive device, for a motor vehicle, also referred to simply as a vehicle. This means that the motor vehicle, preferably designed as a motor vehicle, in particular as a passenger car, in its fully manufactured state, has the electric drive system and can be driven, in particular purely, electrically by means of the electric drive system. For example, the motor vehicle in its fully manufactured state has at least or exactly two axles arranged successively and thus one behind the other in the longitudinal direction of the motor vehicle, namely a first axle and a second axle. Each axle has at least or exactly two wheels, the wheels of each axle being arranged on opposite sides of the motor vehicle in the transverse direction. The wheels of the motor vehicle are ground contact elements by means of which the motor vehicle can be supported or is supported downwards against a ground in the vertical direction of the motor vehicle. When the motor vehicle is driven along the ground while supported downwards by the ground contact elements in the vehicle's vertical direction, the ground contact elements roll along the ground, particularly directly. In particular, the vehicle wheels of at least one or exactly one of the vehicle axles, especially purely, can be driven electrically by means of the drive system, thereby enabling the motor vehicle to be propelled. The vehicle wheels that can be driven by means of the drive system are also referred to as drive wheels. When the term "vehicle wheels" is used below, it refers to the drive wheels unless otherwise specified. Thus, the drive wheels are preferably the vehicle wheels of the same vehicle axle. Within the context of the present disclosure, ordinal numbers such as "first", "first", "first", "second", "second", "second", etc., which are also referred to as ordinal words, are not necessarily used to indicate or imply a number or set of elements to which the ordinal numbers refer, but rather to be able to clearly refer to terms to which the ordinal numbers are assigned or to which the ordinal numbers refer. The electric drive system comprises a first electric machine, which has a first rotor. For example, the first electric machine has a first stator by means of which the first rotor can be driven and thus rotated about a first machine axis of rotation relative to the first stator. For example, the first electric machine can provide first drive torques via its first rotor for, in particular, purely electric, propulsion of the motor vehicle, especially the vehicle wheels. The electric drive system, whose axial direction coincides with a main axis of rotation of the electric drive system, also includes a first transmission, which is simply referred to as the first transmission. For example, the first machine axis of rotation coincides with the main axis of rotation, or the first machine axis of rotation runs parallel to the main axis of rotation and is, in particular, spaced apart from the main axis of rotation. The first transmission has a first input shaft that is permanently and rotationally fixed to the first rotor. The first transmission also has a first output shaft. The first input shaft is rotatable about a first input shaft axis of rotation relative to the first stator and, for example, relative to a housing of the drive system, wherein the first input shaft axis of rotation is aligned with the The first machine axis of rotation coincides with the first output shaft. For example, the first output shaft can be rotated about a first output shaft axis of rotation relative to the housing. The first output shaft axis of rotation may coincide with the main axis of rotation, or the first output shaft axis of rotation may run parallel to the main axis of rotation, or, in particular, it may be spaced apart from the main axis of rotation. It is conceivable that the first output shaft axis of rotation coincides