DE102018113095A1 - Drive device for a motor vehicle - Google Patents

Abstract

The invention relates to a drive device for a motor vehicle, comprising a differential gear (2) and a torque vectoring unit (1) with an electric machine (6), wherein the differential gear (2) comprises a first and a second planetary gear set (3a, 3b). wherein the first planetary gear set (3a) has first planetary gears (13a) and the second planetary gearset (3b) has second planetary gears (13b), wherein the first and second planetary gears (13a, 13b) are rotatably mounted on a common web (4), wherein the first planetary gears (13a) mesh with a first sun gear (5a), the second planetary gears (13b) meshing with a second sun gear (5b), and the first planetary gears (13a) are further paired with the second planetary gears (13b) are in meshing engagement, the second sun gear (5b) being operatively connected to the torque vectoring unit (1), the second planetary gears (13b) further comprising a set of differential gears (15) are in meshing engagement, wherein the differential gears (15) are also rotatably mounted on the common web (4) and with a third sun gear (5c) in meshing engagement, wherein the third sun gear (5c) with the torque vectoring unit (1) is operatively connected.

Description

The invention relates to a drive device for a motor vehicle, comprising a differential gear and a torque vectoring unit with an electric machine.

The DE 10 2015 223 130 A1 discloses a generic drive device for a motor vehicle, comprising a differential gear and a torque vectoring unit with an electric machine. The differential gear has a first and a second planetary gearset rotatably mounted on a common web, wherein the first planetary gearset meshes at least with a first sun, the second planetary gearset meshes at least with a second sun, and the two planetary gear sets mesh with each other at least in pairs. Further, at least the second sun is connected to the torque vectoring unit for redistributing the torque between the first and second sun. Furthermore, the first planetary gearset also meshes with a third sun, the third sun being connected to the torque vectoring unit for redistributing the torque between the first and second suns.

The object of the present invention is to provide an alternative drive device with a higher gear ratio. The object is solved by the subject matter of claim 1. Preferred embodiments are given in the dependent claims.

The drive device according to the invention for a motor vehicle comprises a differential gear and a torque vectoring unit with an electric machine, wherein the differential gear has a first and a second planetary gear set, wherein the first planetary gearset first planetary gears and the second planetary gear set second planetary gears, wherein the first and second planetary gears are rotatably mounted on a common web, wherein the first planetary gears are in meshing engagement with a first sun gear, wherein the second planetary gears mesh with a second sun gear, and wherein the first planetary gears are further in pair with the second planet gears meshing, wherein the second sun gear is operatively connected to the torque vectoring unit, wherein the second planet gears are further meshed with a set of differential gears, the differential gears are also rotatably mounted on the common web and with a dr sun gear meshing with the third sun gear is operatively connected to the torque vectoring unit.

In other words, the differential gear is designed as a spur gear differential. A spur gear is a transmission in the manner of a planetary gear in which the mutually meshing compensating elements are formed as gears with spur toothing. The spur gear differential has the first and second sun gear, wherein the first planetary gear set is assigned to the first sun gear and the second planetary gearset is assigned to the second sun gear, wherein all the planet gears of the first and second planetary gears are spur gears. Each planetary gear of the first planetary gear set is in meshing engagement with a respective planetary gear of the first planetary gearset. Furthermore, the second planetary gears are operatively connected via the differential gears with the third sun gear, wherein a higher gear ratio is achieved via the differential gears.

The term "operatively connected" is to be understood that two transmission elements may be directly connected to each other, or that there are other transmission elements between two transmission elements, for example, one or more shafts or gears. Two meshing gears are provided for transmitting torque and rotational speed from one gear to the other gear. Under a gear, for example, a planetary gear, a sun gear, a ring gear and a pinion to understand.

The electric machine causes a redistribution of a torque fed into the differential gear on the first and second planetary gear set and thus also on the first and second sun gear. On the one hand, a uniform drive of both sun gears is possible. On the other hand, by initiating or branching off a torque vectoring torque, the full torque of the drive motor can be diverted to the first or second sun gear.

The invention includes the technical teaching that the first sun gear is rotatably connected to a first output shaft, wherein the second sun gear is rotatably connected to a second output shaft. The redistribution of the torque to the first or second sun gear or to the first or second output shaft produces a yawing moment about a vertical axis of the motor vehicle, whereby the driving dynamics can be influenced in a targeted manner. In contrast, distributes the torque vectoring unit, the entire torque from one output shaft to the other output shaft, the yaw moment can be applied in the opposite direction. The regulation of the torque on the torque vectoring unit thus steplessly sets the yaw moment.

Preferably, the second sun gear is rotatably connected to a first web of the torque vectoring unit. Preferably, the third is Sun gear rotatably connected to a second bridge of the torque vectoring unit. In particular, the torque vectoring unit comprises a third and a fourth planetary gear set, wherein the third planetary gearset has third planetary gears and the fourth planetary gearset has fourth planetary gears. Preferably, the third planet gears are rotatably mounted on the first web and are in meshing engagement with a first ring gear and a fourth sun gear, wherein the fourth planet gears are rotatably mounted on the second land and mesh with a second ring gear and a fifth sun gear. Further preferably, the fourth sun gear is stationary fixed to a housing of the torque vectoring unit and the fifth sun gear connected to a rotor shaft of the electric machine. In particular, the first ring gear is non-rotatably connected to the second ring gear. Preferably, the first ring gear and the second ring gear are integrally formed.

Further measures improving the invention will be described in more detail below together with the description of a preferred embodiment of the invention with reference to the single figure. The single figure shows a simplified schematic representation to illustrate the structure of a drive device according to the invention.

According to the single figure, a drive device according to the invention for a - not shown here - motor vehicle, a differential gear 2 and a torque vectoring unit 1 with an electric machine 6 on. The differential gear 2 includes a first and a second planetary gear set 3a . 3b , where the first planetary gear set 3a first planet wheels 13a and the second planetary gear set 3b second planet wheels 13b having. The first and second planet gears 13a . 13b are at a common jetty 4 rotatably mounted. The common footbridge 4 is as a circulation housing of the differential gear 2 trained and is powered by an electric drive motor 8th , in this case via a drive toothing 14 for introducing a torque into the differential gear 2 driven. The introduced torque is transmitted via the common bridge 4 on the two planetary gear sets 3a . 3b distributed.

The first planet wheels 13a stand with a first sun gear 5a in tooth engagement, the second planetary gears 13b with a second sun gear 5b in mesh. Furthermore, there are the first planetary gears 13a in pairs with the second planetary gears 13b in the tooth mesh. Furthermore, there are the second planetary gears 13b also with a set of differential gears 15 in meshing, with the differential gears 15 as well as the first and second planet gears 13a . 13b at the common footbridge 4 are rotatably mounted. The differential gears 15 stand with a third sun gear 5c in the tooth mesh. The three sun wheels 5a . 5b . 5c are together with the first and second planet wheels 13a . 13b the two planetary gear sets 3a . 3b as well as the differential gears 15 compact design in the circulation housing of the differential gear 2 arranged. The second planet wheels 13b , the differential gears 15 and the third sun wheel 5c have identical numbers of teeth. Through the differential gears 15 that with the second planetary gears 13b meshing with each other, becomes an internal translation of the third sun gear 5c to the two planet wheels 13a . 13b realized.

The first sun wheel 5a is with a first output shaft 9a rotatably connected, wherein the second sun gear 5b with a second output shaft 9b and with a first jetty 7a the torque vectoring unit 1 rotatably connected. Further, the third sun gear 5c with a second jetty 7b the torque vectoring unit 1 rotatably connected. The torque vectoring unit 1 is thus on the second sun 5b and the third sun wheel 5c with the differential gear 2 operatively connected and redistributing the torque between the first and second planetary gear sets 3a . 3b and thus also for redistributing the torque between the first and second output shaft 9a . 9b intended.

The torque vectoring unit 1 includes a third and a fourth planetary gear set 3c . 3d , The third planetary set 3c has third planet gears 13c and the fourth planetary gear set 3d has fourth planet gears 13d on. The third planet wheels 13c are at the first jetty 7a rotatably mounted and stand with a first ring gear 11a and a fourth sun gear 5d in the tooth mesh. The fourth planet wheels 13d are at the second jetty 7b rotatably mounted and are connected to a second ring gear 11b and a fifth sun gear 5e in the tooth mesh. The first ring gear 11a is non-rotatable with the second ring gear 11b connected. Further, the fourth sun gear 5d stationary on a housing 12 the torque vectoring unit 1 fixed and thus rotationally fixed to the housing 12 connected. In contrast, the fifth sun gear 5e rotatably with a rotor shaft 10 the electric machine 6 connected.

Due to the sectional illustration, only one compensating wheel and a first, second, third and fourth planetary gear are shown here in each case.

LIST OF REFERENCE NUMBERS

1

Torque vectoring unit

2

differential gear

3a, 3b, 3c, 3d

planetary set

4

common footbridge

5a, 5b, 5c, 5d, 5e

sun

6

electric machine

7a, 7b

web

8th

electric drive motor

9a, 9b

output shaft

10

rotor shaft

11a, 11b

ring gear

12

casing

13a, 13b, 13c, 13d

planet

14

driving teeth

15

pinion

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102015223130 A1 [0002]

Claims (10)

Drive device for a motor vehicle, comprising a differential gear (2) and a torque vectoring unit (1) with an electric machine (6), wherein the differential gear (2) a first and a second planetary gear set (3a, 3b), wherein the first planetary gear set (3a) has first planet gears (13a) and the second planetary gear set (3b) has second planet gears (13b), wherein the first and second planetary gears (13a, 13b) are rotatably mounted on a common web (4), the first planetary gears (13a) are meshed with a first sun gear (5a), the second planetary gears (13b) meshing with a second sun gear (5b), and wherein the first planetary gears (13a) are further paired with the second planetary gears (13b) in FIG Tooth engagement, wherein the second sun gear (5b) with the torque vectoring unit (1) is operatively connected, characterized in that the second planetary gears (13b) further with a set of differential gears (15 ) are in meshing engagement, wherein the differential gears (15) are rotatably mounted on the common web (4) and is in meshing engagement with a third sun gear (5c), wherein the third sun gear (5c) with the torque vectoring unit (1 ) is operatively connected. Drive device after Claim 1 , characterized in that the second sun gear (5b) with a first web (7a) of the torque vectoring unit (1) is rotatably connected. Drive device according to one of the preceding claims, characterized in that the third sun gear (5c) with a second web (7b) of the torque vectoring unit (1) is rotatably connected. Drive device according to one of the preceding claims, characterized in that the common web (4) is connected at least indirectly to an electric drive motor (8). Drive device according to one of the preceding claims, characterized in that the first sun gear (5a) with a first output shaft (9a) is rotatably connected, wherein the second sun gear (5b) with a second output shaft (9b) is rotatably connected. Drive device according to one of the preceding claims, characterized in that the torque vectoring unit (1) comprises a third and a fourth planetary gearset (3c, 3d), the third planetary gearset (3c) third planetary gears (13c) and the fourth planetary gearset ( 3d) fourth planet gears (13d). Drive device after Claim 6 characterized in that the third planetary gears (13c) are rotatably mounted on the first web (7a) and mesh with a first ring gear (11a) and a fourth sun gear (5d), the fourth planetary gears (13d) being meshed with the second Web (7b) are rotatably mounted and with a second ring gear (11b) and a fifth sun gear (5e) are in meshing engagement. Drive device after Claim 7 , characterized in that the fourth sun gear (5d) is stationarily fixed to a housing (12) of the torque vectoring unit (1) and the fifth sun gear (5e) is connected to a rotor shaft (10) of the electric machine (6) , Drive device after Claim 7 , characterized in that the first ring gear (11a) rotatably connected to the second ring gear (11b) is connected. Drive device according to one of the preceding claims, characterized in that the second planet gears (13b), the differential gears (15) and the third sun gear (5c) have identical numbers of teeth.

Images