Drive Device for a Motor Vehicle and Method for Operating a Drive Device

Abstract

A drive device and method for a motor vehicle, provided with a combustion engine machine, with a first electric machine and with a second electric machine, wherein a drive shaft of the combustion engine machine can be coupled by a first clutch to a drive shaft of the first electric machine, which is connected via a transmission drive to a drive shaft of the drive device. At the same time, the gear device is permanently coupled to the drive shaft of the first electric machine and provided with a planetary gear that can be coupled by a second clutch to the drive shaft of an internal combustion engine, wherein the second electric machine is permanently coupled to the drive shaft.

Claims

1. A drive device for a motor vehicle, comprising: a combustion engine machine, a first electric machine and a second electric machine, wherein a drive shaft of the combustion engine machine can be coupled by a first clutch to a drive shaft of the first electric machine, which is connected via a transmission device to a drive shaft of the drive device, wherein the second electric machine is permanently coupled to the drive shaft and the transmission device is provided with a planetary gear that is permanently coupled to the drive shaft of the first electric machine, wherein the planetary gear can be coupled by a second clutch to the drive shaft of the internal combustion machine, wherein the drive shaft of the first electric machine can be coupled via a third clutch to a ring wheel of the planetary gear, and wherein the planetary gear is arranged in the axial direction relative to the axis of rotation of the drive shafts between the internal combustion machine and the first electric machine, and the second electric machine.

2. The drive device according to claim 1, wherein the drive shaft of the first electric machine is permanently coupled to a sun wheel of the planetary gear.

3. The drive device according to claim 1, wherein the drive shaft of the internal combustion engine machine can be coupled via the second clutch to the ring wheel.

4. The drive device according to claim 1, wherein the drive shaft is permanently coupled to a planetary carrier of a planetary gear.

5. The drive device according to claim 1, wherein a first transmission ratio is provided between the drive shaft and the planetary carrier, and a second transmission ratio is provided between the drive shaft and the drive shaft of the second electric machine.

6. The drive device according to claim 1, wherein the ring wheel can be braked by means of a brake.

7. The drive device according to claim 1, wherein the ring wheel can be braked by means of a brake.

8. The drive device according to claim 1, wherein the drive shafts of the internal combustion machine and of the first electric machine are arranged mutually coaxially to one another.

9. Method for operating a drive device, comprising: an internal combustion engine, with a first electric machine and with a second electric machine, wherein a drive shaft of the internal combustion machine can be coupled by a first clutch to the first drive shaft of the first electric machine, which is connected via a transmission device to a drive shaft of the drive device, wherein the second electric machine is permanently coupled to the drive shaft and the drive device is provided with a planetary gear of the first electric machine that is permanently coupled to the drive shaft, wherein the planetary gear can be coupled by a second clutch to the drive shaft of the internal combustion machine, wherein the drive shaft of the first electric machine can be coupled via a third clutch to a ring wheel of the planetary gear, and wherein the planetary gear is arranged in the axial direction relative to a rotational axis of the drive shafts between the internal combustion machine and the first electric machine and the second electric machine.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIGURE The FIGURE shows a schematic illustration of a drive device for a motor vehicle.

DETAILED DESCRIPTION

[0031] The FIGURE shows a schematic representation of a drive device 1 for a motor vehicle 2, not shown in detail. The motor vehicle 2 is provided with a wheel axle 3 having two partial axles 4 and 5, which are coupled via an axle differential gear 6 both to each other and to an output shaft 7 of the drive device 1. An operating connection between the output shaft 7 and the axle differential gear 6 is in this case provided via a gear stage 8. However, it goes without saying that a direct coupling can be also provided.

[0032] The drive device 1 can provide a drive torque for driving the motor vehicle 2 via the output shaft 7. For this purpose, the drive device 1 is provided via an internal combustion engine 9 with a first electric machine and with a second electric machine 11. The internal combustion machine 9 is equipped with a drive shaft 12, while the first electric machine 10 is equipped with a drive shaft 13, and the second electric machine 11 is equipped with a drive shaft 14. The drive shafts 12 and 13 of the internal combustion machine 9 and of the first electric machine 10 can be mutually coupled to one another by means of a first clutch 15.

[0033] When the clutch 15 is closed or slipping, the internal combustion engine 9 can be brought along to start operating by means of the first electric machine 10, in particular at a minimum rotational speed of the internal combustion engine 9. The first electric machine 10 is in this case used as a starter for the internal combustion engine 9. Conversely, it goes without saying that the first electric machine 10 can be also operated as a generator and driven by means of the internal combustion engine 9.

[0034] The drive shaft 13 of the first electric machine 19 is connected via a transmission device 16, which is provided with a planetary gear or designed as a planetary gear, to the output shaft 7. In this case, a sun wheel 17 of the planetary gear is rigidly connected to the drive shaft 13 of the first electric machine 10, while the drive shaft 7 is coupled to a planetary carrier 18, for example via a gear stage 19. At least one planetary wheel 20 is rotatably mounted on the planetary carrier 18. It meshes with the sun wheel 17 on the one hand, and on the other hand with the ring wheel 21 of the planetary gear. In summary, the transmission device 16 or the planetary gear are permanently connected or coupled to the drive shaft 13 of the first electric machine.

[0035] In addition to the first clutch 15, a second clutch 22 is also provided. In this manner, an operational connection can be established between the drive shaft 13 of the internal combustion engine 9 and the planetary gear, in particular the ring wheel 21 of the planetary gear. Additionally, the drive shaft 13 of the first electric machine 10 can be coupled to the ring wheel with the aid of a third clutch. When the third clutch 23 is closed, both the sun wheel 17 and the ring wheel 21 are coupled to the drive shaft 13 of the first electric machine 10, so that the planetary gear is blocked. In addition, a brake 24 also makes it possible to brake the ring wheel 21.

[0036] The following operating modes are obtained by means of the configuration of the drive device 1 described above: with the aid of the first clutch 15, the drive shafts 12 and 13 of the internal combustion engine 9 and of the first electric machine 10 can be coupled in order to start a hybrid operation of the drive device 1, or to operate the drive device 1 as a serial hybrid drive device 1. With the aid of the second clutch 22, which connects the internal combustion engine machine 9 or its drive shaft 12 to the ring wheel 21, a variable-speed operating range can thus be realized.

[0037] The third clutch 23, on the other hand, is used to block the planetary gear, so that a second driving gear is provided in this respect. If the ring gear 21 is fixed by means of the brake 24, the drive shaft 7 can be driven solely by means of the combustion engine 9 by closing the first clutch 15 and the third clutch 23, wherein a first driving gear is provided which has a transmission ratio that is different from the second driving gear.

[0038] The drive device 1 described above is provided with a very compact transmission 16, which nevertheless makes it possible to use the drive device 1 over the entire intended operating range of the motor vehicle. Overall, the drive device is thus characterized by the fact that a small installation space is required, as well as by a small weight, while a high flexibility is also achieved.