DE102016216804A1 - Drive device for a motor vehicle - Google Patents

Abstract

The invention relates to a drive device for a motor vehicle having a drive machine (1) which is operatively connected via a drive shaft (2) to a transmission device (3) comprising a Wolfrom gear (4) and a differential gear (5), wherein the differential gear (5 ) comprises a first and a second planetary gear set (6a, 6b) with a plurality of planet gears (7a, 7b), each planetary gear (7a) of the first planetary gear set (6a) having a first ring gear (8a) and a respective planet wheel (7b) of the second Planet set (6b) is in meshing engagement, each planetary gear (7b) of the second planetary gear set (6b) with a first sun (9a) and a respective planetary gear (7a) of the first planetary gear set (6a) is in mesh, wherein the first sun (9a ) is rotatably connected to a first output shaft (10 a), and wherein the planetary gears (7 a, 7 b) of the two planetary gear sets (6 a, 6 b) are rotatably mounted on a first planetary carrier (11 a), wherein the first tarpaulin Furthermore, the Wolfrom transmission (4) comprises at least one stepped planetary gear set (12) with a plurality of stepped planetary gears (13) rotatably mounted on a second planetary carrier (11b), each stepped planetary gear (13) being axially fixed to a second output shaft (10b) ), a first and a second rotatably connected to each other stepped wheel (13a, 13b), wherein the first stage wheel (13a) of the stepped planet gears (13) with a second sun (9b) and a second ring gear (8b) is in meshing engagement, the second Stage wheel (13b) of the stepped planet wheels (13) with a third ring gear (8c) is in meshing engagement, and wherein the first and the third ring gear (8a, 8c) rotatably connected to each other.

Description

The invention relates to a drive device for a motor vehicle, in particular for an electrically driven motor vehicle.

For example, goes from the DE 10 2014 213 142 A1 a drive arrangement for a motor vehicle with a drive motor and a double differential connected thereto. The dual differential comprises a first and a second differential. The introduction of a drive torque in the double differential via an external gear, which is connected to a planet carrier of the first differential. The first differential comprises the planet carrier, on which a first and a second planetary gearset are rotatably mounted, wherein the planets of the respective planetary gearset mesh with each other in pairs. The planets of the first planetary gear set further meshes with a first ring gear which simultaneously meshes with a first planetary gear set of the second differential and thus connects the first differential to the second differential gear. The second differential has in addition to the first planetary gear set to a second planetary gear set, wherein the two planetary gear sets are rotatably mounted on a common planet carrier of the second differential, and wherein the planets of the two planetary gear sets mesh in pairs.

The object of the present invention is to provide a drive device for a motor vehicle, wherein the drive device is particularly space-saving and highly translatable design.

The drive device for a motor vehicle according to the invention comprises a drive machine, which is operatively connected via a drive shaft with a transmission device, wherein the transmission device comprises a Wolfromgetriebe and a differential gear, wherein the differential gear comprises a first and a second planetary gear set with a plurality of planetary gears, wherein each planetary gear of the first planetary gear set with a first ring gear and a respective planetary gear of the second planetary gear meshing with each planetary gear of the second planetary gear set is meshed with a first sun and a respective planetary gear of the first planetary gear set, wherein the first sun is rotatably connected to a first output shaft, and wherein the planetary gears of the two planetary gear sets are rotatably mounted on a first planetary carrier, wherein the first planet carrier rotatably connected to a second output shaft, wherein further the Wolfromgetriebe mi at least one step planetary set having a plurality of step planetary gears rotatably mounted on a second planetary carrier, each step planetary gear having first and second stepwheels rotatably connected to each other, the first stepwheel of the stepwheel gears meshing with a second sun and a second ring gear, the second stepwheel the stepped planet gears mesh with a third ring gear, and wherein the first and third ring gears are non-rotatably connected. In other words, the first and the third ring gear connect the Wolfromgetriebe and the differential gear with each other gear, whereby a space-saving, high-ratio gear device is realized. In particular, the first ring gear is formed integrally with the third ring gear.

The term "operatively connected" is to be understood that two elements may be directly connected to each other, or there are other elements between two elements, for example, one or more gears or shafts.

Two meshing gears are provided for transmitting torque and rotational speed from one gear to the other gear. Under a "gear" is for example a sun, a ring gear and a planetary gear or Stufenplanetenrad a planetary gear set or step planetary gear set to understand.

A "Wolfromgetriebe" is a reduced coupling gear to understand that has three connection shafts. The Wolfrom transmission is a transmission with a gear ratio greater than 10. In this case, the Wolfromgetriebe has at least one stepped planetary set, the stepped planet wheels are rotatably mounted on a common planet carrier and are in meshing engagement with a sun and two axially adjacent ring gears.

The invention includes the technical teaching that the drive machine is designed as an electric machine with a stator and a rotor. Preferably, the drive shaft is arranged coaxially with the two output shafts. In particular, the drive shaft is designed as a hollow shaft, wherein one of the two output shafts extends axially through the drive shaft.

Preferably, the drive shaft is rotatably connected to the second sun. Thus, the prime mover drives the transmission device, in particular the Wolfrom transmission, via the second sun. The second sun is in meshing engagement with the first stage gear of the stepped planet gears, the first stage gear of the stepped planet gears further meshing with the second ring gear. Preferably, the second ring gear is fixed stationarily on a housing.

Preferably, the differential gear is designed as a spur gear differential, wherein the differential gear is provided to distribute a drive power of the prime mover to the two output shafts. In particular, the two output shafts are arranged on a common drive axle of the motor vehicle.

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 prime mover 1 and a transmission device 3 on. The prime mover 1 is designed as an electrical machine and has a stator 14 and a rotor 15 on. Further, the transmission device 3 to the prime mover 1 flanged. A drive power of the prime mover 1 is via a drive shaft 2 that is between the prime mover 1 and the transmission device 3 is arranged in the transmission device 3 initiated. The transmission device 3 includes a tungsten gear 4 and a differential gear 5 ,

The differential gear 5 has a first and a second planetary gear set 6a . 6b with several planet wheels 7a . 7b on. Due to the sectional view is only one planetary gear 7a . 7b of the respective planetary gear set 6a . 6b shown. Every planetary gear 7a of the first planetary gear set 6a stands with a first ring gear 8a and a respective planetary gear 7b of the second planetary gear set 6b in the tooth mesh. In contrast, every planetary gear is available 7b of the second planetary gear set 6b with a first sun 9a and a respective planetary gear 7a of the first planetary gear set 6a in the tooth mesh. The first sun 9a is non-rotatable with a first output shaft 10a connected. The planet wheels 7a . 7b the two planetary gear sets 6a . 6b are rotatable on a first planetary carrier 11a stored, the first planet carrier 11a rotatably with a second output shaft 10b connected is. The differential gear 5 is designed as a spur gear and provided to drive power of the prime mover 1 on the first and second output shaft 10a . 10b to distribute. The drive shaft 2 is coaxial with the two output shafts 10a . 10b arranged.

The tungsten gearbox 4 has a stepped planetary set 12 with several stepped planet wheels 13 on, with the stepped planet wheels 13 rotatable on a second planetary carrier 11b are stored. Due to the sectional view is only a Stufenplanetenrad 13 of the stepped planetary set. Each step planetary wheel 13 has a first and a second non-rotatably connected step wheel 13a . 13b on. The first step wheel 13a the stepped planet wheels 13 stands with a second sun 9b and a second ring gear 8b in tooth engagement, wherein the second ring gear 8b stationary on a housing 16 is fixed. In contrast, stands the second stage wheel 13b the stepped planet wheels 13 with a third ring gear 8c in the tooth mesh. The first and the third ring gear 8a . 8c are rotatably connected. Thus, the Wolfromgetriebe 4 and the differential gear 5 over the first and the third ring gear 8a . 8c geared together.

LIST OF REFERENCE NUMBERS

1

 prime mover

2

 drive shaft

3

 transmission device

4

 Wolfrom

5

 differential gear

6a, 6b

 planetary set

7a, 7b

 planet

8a, 8b, 8c

 ring gear

9a, 9b

 Sun

10a, 10b

 output shaft

11a, 11b

 planet carrier

12

 Stepped planet set

13

 Stufenplanetenrad

13a, 13b

 step gear

14

 stator

15

 rotor

16

 casing

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 102014213142 A1 [0002]

Claims (6)

Drive device for a motor vehicle with a drive machine ( 1 ), which via a drive shaft ( 2 ) with a transmission device ( 3 ) comprising a tungsten gear ( 4 ) and a differential gear ( 5 ), the differential gear ( 5 ) a first and a second planetary gear set ( 6a . 6b ) with several planet wheels ( 7a . 7b ), each planetary gear ( 7a ) of the first planetary gear set ( 6a ) with a first ring gear ( 8a ) and a respective planetary gear ( 7b ) of the second planetary gear set ( 6b ) is in meshing engagement, each planetary gear ( 7b ) of the second planetary gear set ( 6b ) with a first sun ( 9a ) and a respective planetary gear ( 7a ) of the first planetary gear set ( 6a ) is meshed with the first sun ( 9a ) rotatably with a first output shaft ( 10a ), and wherein the planetary gears ( 7a . 7b ) of the two planetary gear sets ( 6a . 6b ) rotatably on a first planetary carrier ( 11a ), wherein the first planet carrier ( 11a ) rotatably with a second output shaft ( 10b ), wherein furthermore the Wolfromgetriebe ( 4 ) at least one step planetary set ( 12 ) with a plurality of rotatable on a second planet carrier ( 11b ) Staged Planetary Wheels ( 13 ), each step planetary gear ( 13 ) a first and a second rotatably connected to each other Stufenrad ( 13a . 13b ), wherein the first step wheel ( 13a ) of the stepped planet wheels ( 13 ) with a second sun ( 9b ) and a second ring gear ( 8b ) is in tooth engagement, wherein the second step wheel ( 13b ) of the stepped planet wheels ( 13 ) with a third ring gear ( 8c ) is in meshing engagement, and wherein the first and the third ring gear ( 8a . 8c ) are rotatably connected to each other. Drive device according to claim 1, characterized in that the drive machine ( 1 ) as an electric machine with a stator ( 14 ) and a rotor ( 15 ) is trained. Drive device according to one of the preceding claims, characterized in that the drive shaft ( 2 ) rotatably with the second sun ( 9 ) connected is. Drive device according to one of the preceding claims, characterized in that the second ring gear ( 8b ) stationary on a housing ( 16 ). Drive device according to one of the preceding claims, characterized in that the drive shaft ( 2 ) coaxial with the two output shafts ( 10a . 10b ) is arranged. Drive device according to one of the preceding claims, characterized in that the differential gear ( 5 ) is provided to a drive power of the prime mover ( 1 ) substantially in half on the output shafts ( 10a . 10b ) to distribute.

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