Electric drive train for a motor vehicle, in particular for a motor car

Patent metadata

Field	Value
Publication number	US-12583302-B2
Application number	US-202319107169-A
Country	US
Kind code	B2
Filing date	Jul 21, 2023
Priority date	Aug 29, 2022
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

An electric drive train for a motor vehicle having first and second electric engines and a planetary gearbox which has a first shaft, a second shaft, a third shaft, a fourth shaft and a fifth shaft, and first and second vehicle wheels. With regard to a torque flow originating from the electric engines running to the vehicle wheels, the electric engines are arranged upstream of the planetary gearbox, which is arranged upstream of the vehicle wheels in the torque flow. A first switching element is provided to couple the second rotor to the first shaft.

First claim

The invention claimed is:

1 . An electric drive train for a motor vehicle, the electric drive train comprising:
a first electric engine comprising a first rotor; a second electric engine comprising a second rotor; a planetary gearbox comprising a first shaft, a second shaft, a third shaft, a fourth shaft, and a fifth shaft; a first vehicle wheel; a second vehicle wheel, wherein, with regard to a torque flow originating from the first and second electric engines and running to the first and second vehicle wheels, the first and second electric engines are arranged upstream of the planetary gearbox, and the planetary gearbox is arranged upstream of the first and second vehicle wheels in the torque flow; a first switching element configured to couple the second rotor to the first shaft in such a way that torques suppliable by the second electric engine via the second rotor are introducible at the first shaft into the planetary gearbox; a second switching element, which is a power shift switching element and is configured to connect the third shaft to a sixth shaft to conjointly rotate; a third switching element, which is a form-fitting coupling configured to connect the second shaft or the fourth shaft to the sixth shaft of the electric drive train to conjointly rotate; a first transmission stage which, with regard to the torque flow, is arranged downstream of the planetary gearbox and upstream of the first vehicle wheel in the torque flow, wherein the fourth shaft is coupled to or is couplable to the first vehicle wheel via the first transmission stage; and a second transmission stage which, with regard to the torque flow, is arranged downstream of the planetary gearbox and upstream of the second vehicle wheel in the torque flow, wherein the fifth shaft is coupled to or is couplable to the second vehicle wheel via the second transmission stage, and wherein a first transmission of the first transmission stage is different than a second transmission of the second transmission stage.

2 . The electric drive train of claim 1 , wherein
the planetary gearbox comprises a first planetary gear set and a second planetary gear set, a first planetary carrier of the first planetary gear set and a second planetary carrier of the second planetary gear set are connected to each other to conjointly rotate and form a common planetary carrier, one of the first, second, third, fourth, and fifth shafts of the planetary gearbox comprises the common planetary carrier.

3 . The electric drive train of claim 2 , wherein the first shaft comprises one sun gear of the planetary gearbox, wherein the third shaft comprises another sun gear of the planetary gearbox or one ring gear of the planetary gearbox.

4 . The electric drive train of claim 3 , wherein the sixth shaft is coupled to or is couplable to the first rotor and, with regard to the torque flow, is arranged between the first rotor and the planetary gearbox in the torque flow.

5 . The electric drive train of claim 4 , wherein
the first shaft comprises a first of the sun gears; the third shaft comprises a second of the sun gears; the second shaft comprises the common planetary carrier; the fifth shaft comprises a first one of ring gears of the planetary gearbox; and the fourth shaft comprises a second one of the ring gears of the planetary gearbox.

6 . The electric drive train of claim 5 , wherein
first planetary gears, second planetary gears, and third planetary gears of the planetary gearbox are rotatably mounted on the common planetary carrier; the first planetary gears mesh with the first of the sun gears and with the second planetary gears; the second planetary gears mesh with the first ring gear and with the second of the sun gears; and the third planetary gears mesh with the second planetary gears and with the second ring gear.

7 . The electric drive train of claim 4 , wherein the sixth shaft is connected to the first rotor to conjointly rotate.

8 . The electric drive train of claim 3 , wherein the sixth shaft is connected to a first input shaft of the first transmission stage to conjointly rotate and, with regard to the torque flow, is arranged downstream of the planetary gearbox in the torque flow.

9 . The electric drive train of claim 8 , wherein
the first shaft comprises a first of the sun gears of the planetary gearbox; the second shaft comprises a first one of ring gears of the planetary gearbox; the third shaft comprises a second of the ring gears of the planetary gearbox; the fourth shaft comprises a second one of the sun gears of the planetary gearbox; and the fifth shaft comprises the common planetary carrier.

10 . The electric drive train of claim 9 , wherein
first planetary gears, second planetary gears, and third planetary gears are rotatably mounted on the common planetary carrier; the first planetary gears mesh with the first of the sun gears and with the first ring gear; the second planetary gears mesh with the second of the sun gears and with the first planetary gears; and the third planetary gears mesh with the second planetary gears and with the second ring gear.

11 . The electric drive train of claim 2 , wherein
transmission ratios are selected inside of the first planetary gear set and inside of the second planetary gear set in such a way that, originating from the first electric engine, torque resulting on the first vehicle wheel via a first torque transmission path up to the first vehicle wheel is same as torque resulting on the second vehicle wheel via a second torque transmission path up to the second vehicle wheel, the first torque transmission path runs from the first electric engine, continues via the sixth shaft, continues via the second shaft, continues via the fourth shaft, continues via the first transmission stage up to the first vehicle wheel, and the second torque transmission path runs from the first electric engine, continues via the sixth shaft, continues via the second shaft, continues via the fifth shaft, continues via the second transmission stage up to the second vehicle wheel.

Assignees

• Mercedes Benz Group Ag

Inventors

• Hahn Peter

Classifications

• F16H2048/368

  using additional orbital gears in combination with clutches or brakes · CPC title

• F16H2048/364

  using electric or hydraulic motors · CPC title

• F16H48/06

  with gears having orbital motion · CPC title

• F16H37/0806

  with a plurality of driving or driven shafts · CPC title

• B60Y2400/804

  Torque vectoring arrangements · CPC title