Electric drive system

Patent metadata

Field	Value
Publication number	US-10272762-B2
Application number	US-201715831494-A
Country	US
Kind code	B2
Filing date	Dec 5, 2017
Priority date	Jul 24, 2015
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

A drive system for a hybrid drive in a motor vehicle is provided. The drive system includes a drive machine with a rotor and a stator; a planetary gear set with a sun gear, a ring gear and at least one planetary gear mounted on a planetary carrier; and a coupling system, by way of which at least one other drive machine can be coupled to the drive system. The ring gear can be connected to the rotor in order to transmit drive power and is arranged inside the rotor in the radial direction. In particular, the sun gear of the drive system is non-rotatably mounted in relation to the stator; the planetary carrier is configured as a transmission output shaft; and a power take-off shaft, which is concentric with the ring gear, can be connected to the planetary carrier and to the coupling system.

First claim

What is claimed is:

1. A drive system for a hybrid drive in a motor vehicle, comprising:
a drive machine including a rotor and a stator;
a planetary gear set including a sun gear, a ring gear, and at least one planetary gear mounted on a planetary gear carrier; and
a coupling device via which at least one further drive machine is couplable to the drive system, wherein
the ring gear is connectable to the rotor to transmit a drive power and is arranged in a radial direction inside the rotor,
the sun gear is mounted in a rotationally-fixed manner in relation to the stator,
the planetary gear carrier is configured as a transmission output shaft in one piece, and
a drive shaft, which is arranged concentrically in relation to the ring gear, is connectable to the planetary gear carrier and to the coupling device.

2. The drive system according to claim 1 , wherein
the ring gear is connected in a rotationally-fixed manner to the rotor and
the planetary gear carrier is rotatably mounted in relation to the ring gear.

3. The drive system according to claim 2 , wherein the drive shaft is connected in a rotationally-fixed manner to the planetary gear carrier.

4. The drive system according to claim 1 , wherein the drive shaft is connected in a rotationally-fixed manner to the planetary gear carrier.

5. The drive system according to claim 1 , wherein the stator is accommodated in a housing module and is connected in a rotationally-fixed manner thereto.

6. The drive system according to claim 5 , wherein the sun gear is connected in a rotationally-fixed manner to the housing module.

7. The drive system according to claim 6 , wherein at least the ring gear, the sun gear, and at least the one planetary gear in the planetary gear set are arranged in an axial direction inside the rotor.

8. The drive system according to claim 7 , wherein the coupling device is arranged radially inside the rotor.

9. The drive system according to claim 5 , wherein the housing module is formed in one piece with a transmission housing for accommodating multiple shift transmission stages.

10. The drive system according to claim 6 , wherein the housing module is formed in one piece with a transmission housing for accommodating multiple shift transmission stages.

11. The drive system according to claim 1 , wherein at least the ring gear, the sun gear, and at least the one planetary gear in the planetary gear set are arranged in an axial direction inside the rotor.

12. The drive system according to claim 1 , wherein the planetary gear set has a stand transmission ratio, the absolute value of which is greater than 1 and less than 2.5.

13. The drive system according to claim 12 , wherein the absolute value of the stand transmission ratio is greater than 1.25 and less than 2.1.

14. The drive system according to claim 13 , wherein the absolute value of the stand transmission ratio is greater than 1.5 and less than 1.8.

15. The drive system according to claim 1 , wherein the coupling device is arranged radially inside the rotor.

16. The drive system according to claim 1 , wherein at least one partial region for selective torque transmission of the coupling device is arranged in an axial direction inside the rotor or is covered by the rotor.

17. The drive system according to claim 16 , wherein an entire region for selective torque transmission of the coupling device is arranged in an axial direction inside the rotor or is covered by the rotor.

18. A hybrid drive train comprising:
a drive system according to claim 1 ;
an internal combustion engine as a further drive machine, which is selectively connectable to the drive system;
a shift transmission device which is connectable to the drive system; and
at least one wheel tire of the vehicle drivable by one of the drive machines,
wherein the shift transmission device is arranged downstream of the drive system with respect to torque transmission from the drive machine to the at least one wheel tire.

19. A hybrid drive train comprising:
a drive system for a hybrid drive in a motor vehicle, comprising:
a drive machine including a rotor and a stator;
a planetary gear set including a sun gear, a ring gear, and at least one planetary gear mounted on a planetary gear carrier; and
a coupling device via which at least one further drive machine is couplable to the drive system, wherein
the ring gear is connectable to the rotor to transmit a drive power and is arranged in a radial direction inside the rotor,
the sun gear is mounted in a rotationally-fixed manner in relation to the stator,
the planetary gear carrier is configured as a transmission output shaft, and
a drive shaft, which is arranged concentrically in relation to the ring gear, is connectable to the planetary gear carrier and to the coupling device;

an internal combustion engine as a further drive machine, which is selectively connectable to the drive system;
a shift transmission device which is connectable to the drive system; and
at least one wheel tire of the vehicle drivable by one of the drive machines,
wherein the shift transmission device is arranged downstream of the drive system with respect to torque transmission from the drive machine to the at least one wheel tire, and
wherein the shift transmission device is an automatic or automated shifting transmission device and has at least one transmission planetary gear set.

20. A drive system for a hybrid drive in a motor vehicle, comprising:
a drive machine including a rotor and a stator;
a planetary gear set including a sun gear, a ring gear, and at least one planetary gear mounted on a planetary gear carrier; and
a coupling device via which at least one further drive machine is couplable to the drive system, wherein
the ring gear is connectable to the rotor to transmit a drive power and is arranged in a radial direction inside the rotor,
the sun gear is mounted in a rotationally-fixed manner in relation to the stator,
the planetary gear carrier is directly connectable to a transmission output shaft, and
a drive shaft, which is arranged concentrically in relation to the ring gear, is connectable to the planetary gear carrier and to the coupling device.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Ohnemus Ulrich
• Etzel Michael
• Kluge Benjamin
• Liebert Sebastian

Classifications

• B60K6/40

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

• B60K6/365 Primary

  with the gears having orbital motion · CPC title

• B60K2006/4825

  Electric machine connected or connectable to gearbox input shaft · CPC title

• B60K2006/4833

  Step up or reduction gearing driving generator, e.g. to operate generator in most efficient speed range · CPC title

• B60K6/48

  Parallel type · CPC title