Drive system for hybrid motor vehicle with convertible direct through-drive for a wheel, and motor vehicle

Patent metadata

Field	Value
Publication number	US-11667183-B2
Application number	US-202017598942-A
Country	US
Kind code	B2
Filing date	Feb 25, 2020
Priority date	Apr 16, 2019
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

A drive system for a hybrid motor vehicle with a motor shaft rotationally coupled to the output shaft of an internal combustion engine, a first and second electric motors with respective first and second rotor shafts arranged in a radially offset manner to each other, a drive part rotationally connected to the second rotor shaft and which can be rotationally connected to at least one wheel, and a transmission unit operatively installed between the motor shaft, the two rotor shafts, and the drive part. A shift device controls the shift position of the transmission unit such that the shift device rotationally connects the motor shaft to the first rotor shaft while the second rotor shaft is decoupled in a first shift position, the shift device rotationally connects the motor shaft both to the first and second rotor shafts in a second shift position, and the shift device rotationally connects the two rotor shafts together while the motor shaft is decoupled in a third shift position.

First claim

The invention claimed is:

1. A drive system for a hybrid motor vehicle, the drive system comprising:
a motor shaft which is rotationally coupled or rotationally couplable to an output shaft of an internal combustion engine;
a first electric motor which has a first rotor shaft and which is operated as a generator in a main operating state;
a second electric motor which has a second rotor shaft arranged in a radially offset manner to the first rotor shaft and which is operated as a drive motor in the main operating state;
a drive part rotationally connected to the second rotor shaft and which is rotationally connectable to at least one wheel of the motor vehicle;
a transmission unit is configured to be shifted and which is operatively installed between the motor shaft, the two rotor shafts, and the drive part;
a shift device which controls a shift position of the transmission unit being operatively installed between the motor shaft, a first gear, which is permanently rotationally coupled to the first rotor shaft, and a second gear, which is permanently rotationally coupled to the second rotor shaft via an additional planetary transmission stage, such that the shift device in a first shift position rotationally connects the motor shaft to the first rotor shaft while the second rotor shaft is rotationally decoupled from the motor shaft, in a second shift position rotationally connects the motor shaft both to the first rotor shaft as well as to the second rotor shaft, and in a third shift position rotationally connects the two rotor shafts together while the motor shaft is rotationally decoupled from the two rotor shafts.

2. The drive system according to claim 1 , wherein the additional planetary transmission stage is formed by a planetary sub-gear, of which planetary sub-gear a sun gear is permanently connected directly to the second rotor shaft, a planet carrier supporting several planet gears is connected to an intermediate gear which is in meshed engagement with the second gear, and a ring gear is configured to be fixed to the vehicle frame by a brake device.

3. The drive system according to claim 1 , wherein the drive part comprises an input gear of a differential gear.

4. The drive system according to claim 1 , wherein the drive part has a toothing that is in direct meshed engagement with the second gear.

5. The drive system according to claim 2 , wherein the drive part has a toothing that is in direct meshed engagement with the intermediate gear rotationally coupled to the second rotor shaft, and the intermediate gear is also rotationally coupled to the second gear.

6. The drive system according to claim 1 , wherein the shift device has a sliding sleeve that is blocked in each shift position via a detent unit and is displaceably received directly in the first gear.

7. The drive system according to claim 6 , wherein the sliding sleeve is permanently received in a rotationally fixed manner with the first gear in each shift of the positions.

8. The drive system according to claim 6 , wherein the sliding sleeve has a first connection region which is couplable to a first transmission region on the motor shaft and a second connection region which is couplable to a second transmission region on the second gear.

9. A motor vehicle comprising the drive system according to claim 1 , wherein the drive part is rotationally coupled to wheels of the motor vehicle.

10. The motor vehicle according to claim 9 , wherein the internal combustion engine is arranged with the output shaft thereof transverse to a vehicle longitudinal axis.

11. The motor vehicle according to claim 9 , wherein the drive part is rotationally connected to wheels of a drive axle.

12. A drive system for a hybrid motor vehicle, the drive system comprising:
a motor shaft configured to be rotationally coupled to an output shaft of an internal combustion engine;
a first electric motor which has a first rotor shaft;
a second electric motor which has a second rotor shaft arranged in a radially offset manner to the first rotor shaft;
a drive part rotationally connected to the second rotor shaft and which is rotationally connectable to at least one wheel of the motor vehicle;
a transmission unit is configured to be shifted operatively installed between the motor shaft, the two rotor shafts, and the drive part;
a shift device which controls a shift position of the transmission unit being operatively installed between the motor shaft, a first gear, which is permanently rotationally coupled to the first rotor shaft, and a second gear, which is permanently rotationally coupled to the second rotor shaft via an additional planetary transmission stage, such that the shift device in a first shift position rotationally connects the motor shaft to the first rotor shaft while the second rotor shaft is rotationally decoupled from the motor shaft, in a second shift position rotationally connects the motor shaft both to the first rotor shaft as well as to the second rotor shaft, and in a third shift position rotationally connects the two rotor shafts together while the motor shaft is rotationally decoupled from the two rotor shafts.

13. The drive system according to claim 12 , wherein the additional planetary transmission stage is formed by a planetary sub-gear, of which planetary sub-gear a sun gear is permanently connected directly to the second rotor shaft, a planet carrier supporting several planet gears is connected to an intermediate gear which is in meshed engagement with the second gear, and a ring gear is configured to be fixed to the vehicle frame by a brake.

14. The drive system according to claim 13 , wherein the drive part comprises an input gear of a differential gear.

15. The drive system according to claim 12 , wherein the drive part has a toothing that is in direct meshed engagement with the second gear.

16. The drive system according to claim 13 , wherein the drive part has a toothing that is in direct meshed engagement with the intermediate gear rotationally coupled to the second rotor shaft, and the intermediate gear is also rotationally coupled to the second gear.

17. The drive system according to claim 12 , wherein the shift device has a sliding sleeve that is blocked in each shift position via a detent unit and is displaceably received directly in the first gear.

18. The drive system according to claim 17 , wherein the sliding sleeve is permanently received in a rotationally fixed manner with the first gear in each shift of the positions.

19. The drive system according to claim 17 , wherein the sliding sleeve has a first connection region which is couplable to a first transmission region on the motor shaft and a second connection region which is couplable to a second transmission region on the second gear.

Assignees

• Schaeffler Technologies Ag

Inventors

• Hoppe Marcus
• Pieper Torsten

Classifications

• B60K6/40

  characterised by the assembly or relative disposition of components · CPC title

• B60K6/36 Primary

  characterised by the transmission gearings · CPC title

• B60K2006/381

  characterized by driveline brakes · CPC title

• B60Y2200/11

  Passenger cars; Automobiles · CPC title

• B60K17/24

  Arrangement of mountings for shafting · CPC title