DRIVE DEVICE COMPRISING AN ELECTRICAL MACHINE AND A RING GEAR CUP

Abstract

A drive device for a motor vehicle includes an electrical machine which is operatively connected to a transmission device via a drive shaft. The transmission device has at least a first and a second planetary stage and a differential stage. Each planetary stage includes a planet set having a plurality of planet gears, the planet gears being rotatably arranged on a planet carrier and meshing with a sun gear and with a ring gear. The second ring gear has external teeth which mesh with internal teeth of a ring gear cup fixed to a housing in a stationary manner.

Claims

1. A drive device for a motor vehicle, comprising a housing, a conically formed ring gear cup fixedly attached to the housing in a stationary manner and an electrical machine which is operatively connected to a transmission device via a drive shaft, the transmission device having at least a first and second planetary stage and a differential stage, the first planetary stage having a first planet set with a plurality of planet gears, such that the planet gears of the first planet set are rotatably arranged on a first planet carrier and mesh with a first sun gear and with a first ring gear, such that the second planet stage comprises a second planet set with several planet gears, such that the planet gears of the second planet set are rotatably arranged on a second planet carrier and mesh with a second sun gear and with a second ring gear, and such that the first and second planetary stages are arranged spatially inside the ring gear cup, the second ring gear has external teeth meshing with first internal teeth of the ring gear cup, and the first ring gear has external teeth which mesh with a second internal teeth of the ring gear cup.

2. The drive device according to claim 1, wherein the differential stage is a spur gear differential comprising first and second spur gear train with respective planetary gears, the differential stage being provided for distributing a drive power of the electrical machine to a first and second output shaft.

3. The drive device according to claim 2, wherein the planet gears of the first spur gear train mesh with a gear on the first output shaft, the planet gears of the second spur gear train meshing with a gear on the second output shaft, and the planet gears of both spur gear sets are rotatably arranged on a third planet carrier and mesh with each other in pairs.

4. The drive device according to claim 1, wherein the electrical machine comprises a stator and a rotor, the rotor being connected to the drive shaft in a rotationally fixed manner.

5. The drive device according to claim 2, wherein the electrical machine is arranged coaxially with the differential stage, the drive shaft being constructed as a hollow shaft and the first output shaft being guided through the input drive shaft.

6. The drive device according to claim 1, wherein the drive shaft is connected to the first sun gear in a rotationally fixed manner.

7. The drive device according to claim 1, wherein the first planet carrier is connected to the second sun gear in a rotationally fixed manner.

8. The drive device according to claim 1, wherein the second planet carrier is connected to the third planet carrier in a rotationally fixed manner.

9. A drive device for a motor vehicle, comprising: a housing; a conically formed ring gear cup fixedly attached to the housing in a stationary manner; a first planetary gear set having a first sun gear, a first carrier, a first ring gear, and a plurality of first planet gears, each first planet gear supported for rotation with respect to the first carrier and meshing with the first sun gear and with internal teeth of the first ring gear, the first ring gear also having external teeth meshing with first internal teeth of the ring gear cup; a second planetary gear set having a second sun gear, a second carrier, a second ring gear, and a plurality of second planet gears, each second planet gear supported for rotation with respect to the second carrier and meshing with the second sun gear and with internal teeth of the second ring gear, the second ring gear also having external teeth meshing with second internal teeth of the ring gear cup; and an electrical machine operatively connected to the first planetary gear set via a drive shaft;

10. The drive device according to claim 9 wherein the first and second planetary gear sets are spatially arranged inside the ring gear cup.

11. The drive device according to claim 9, further comprising: a first output shaft fixed to a third sun gear; a second output shaft fixed to a fourth sun gear; and a spur gear differential having a third carrier, a plurality of third planet gears each supported for rotation with respect to the third carrier and meshing with the third sun gear, and a plurality of fourth planet gears each supported for rotation with respect to the third carrier and meshing with the fourth sun gear and one of the third planet gears.

12. The drive device according to claim 11, wherein the electrical machine comprises a stator and a rotor, the rotor fixed to the drive shaft, the rotor and the drive shaft both being hollow and the first output shaft extending through the drive shaft and the rotor.

13. The drive device according to claim 9, wherein the drive shaft is connected to the first sun gear in a rotationally fixed manner.

14. The drive device according to claim 9, wherein the first planet carrier is connected to the second sun gear in a rotationally fixed manner.

15. The drive device according to claim 9, wherein the second planet carrier is connected to the third planet carrier in a rotationally fixed manner.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Further measures are described below together with two exemplary embodiments using the two figures. Herein

[0021] FIG. 1 shows a simplified schematic representation of a drive device. and

[0022] FIG. 2 shows a simplified schematic diagram to illustrate the structure of a drive unit.

DETAILED DESCRIPTION

[0023] According to FIG. 2, the drive device for a motor vehicle consists of an electrical machine 1 and a transmission device 3. The electrical machine 1 is provided to be the drive machine and has a stator 17 and a rotor 18. A drive power of the electrical machine 1 is transmitted to the transmission device 3 via a drive shaft 2, which is arranged between the electrical machine 1 and the transmission device 3 and designed as a rotor shaft. Thus a speed and torque for driving the vehicle is fed into the transmission device 3 via the drive shaft 2. The transmission device 3 consists of a first and second planetary stage 4, 5 and a differential stage 6.

[0024] The differential stage 6 is designed as a spur gear differential and has a first and second spur gear train with corresponding planetary gears 6a, 6b. The differential stage 6 is provided so that an input power of the electrical machine 1 is distributed to a first and second output shaft 12a, 12b of the transmission device 3. The input shaft 2 is arranged coaxially to the two output shafts 12a, 12b. For this purpose, input shaft 2 is designed as a hollow shaft, with the first output shaft 12a passing through input shaft 2. In addition, the electrical machine 1 is arranged coaxially to the differential stage 6.

[0025] The second planetary stage 5 has a second planet set with several planet gears 5a, such that the planet gears 5a of the second planet set are rotatably arranged on a second planet carrier 8b and mesh with a second sun gear 9b and with a second ring gear 10b. The second planet carrier 8b is non-rotatably connected to the third planet carrier 8c. The second ring gear 10b has external teeth 7a which mesh with first internal teeth 16a of a ring gear cup 14 attached to a housing 11 in a stationary manner. The ring gear cup wheel 14 is conical and connected to the housing 11 via the fixing elements 15 provided therefor. Only one fixing element 15 is shown.

[0026] The first planetary stage 4 has a first planet set with several planet gears 4a, such that the planet gears 4a of the first planet set are rotatably arranged on a first planet carrier 8a and mesh with a first sun gear 9a and a first ring gear 10a.

[0027] According to FIG. 1, the first ring gear 10a is connected to the second planet carrier 8b in a rotationally fixed manner. The drive shaft 2 is connected to the first sun gear 9a and the first planet carrier 8a is connected to the second sun gear 9b. The ring gear cup 14 encloses the first and second planetary stages 4, 5.

[0028] As shown in FIG. 2, the first ring gear 10a has external teeth 7b which mesh with second internal teeth 16b of the ring gear cup 14 which is fixed to the housing 11 in a stationary manner. The ring gear cup 14 encloses the first and second planetary stages 4, 5. The drive shaft 2 is connected to the first sun gear 9a and the first planet carrier 8a is connected to the second sun gear 9b.

LIST OF REFERENCE SYMBOLS

[0029] 1 Electrical machine

[0030] 2 Drive Shaft

[0031] 3 Transmission device

[0032] 4 First planetary stage

[0033] 4a Planet gear

[0034] 5 Second planetary stage

[0035] 5a Planet gear

[0036] 6 Differential stage

[0037] 6a, 6b Planet gear

[0038] 7a, 7b External teeth

[0039] 8a, 8b, 8c Planet carrier

[0040] 9a, 9b Sun gear

[0041] 10a, 10b, 10c Ring gear

[0042] 11 Housing

[0043] 12a, 12b Output shaft

[0044] 13a, 13b Gearing

[0045] 14 Ring gear cup

[0046] 15 Fixing element

[0047] 16a, 16b Internal teeth

[0048] 17 Stator

[0049] 18 Rotor