DE102018127881A1 - Drive device for a motor vehicle - Google Patents

Abstract

The invention relates to a drive device for a motor vehicle, comprising an electrical machine (1) with a rotor shaft (10) which can be connected to a transmission device (3) via a first and second coupling (2a, 2b), the transmission device (3) A planetary gear set (4), a stepped planetary gear set (5) and a differential gear (6), the planetary gear set (4) having a first sun gear (7a), a first ring gear (8a) and a plurality of planet gears (4a) which are connected to a first Planet carriers (9a) are rotatably mounted and mesh with the first sun gear (7a) and the first ring gear (8a), the stepped planet gear set (5) having a plurality of stepped planet gears (5a) which are rotatably mounted on a second planet carrier (9b) , wherein each step planet gear (5a) has a first and second rotationally fixedly connected gear (5b, 5c), the first gear (5b) being in mesh with a second sun gear (7b) where the second gear (5c) is in mesh with a second ring gear (8b), and the second planet carrier (9b) is operatively connected to the differential gear (6), the two ring gears (8a, 8b) being fixed to the housing, furthermore the first sun gear (7a) is operatively connected to the first clutch (2a), and the first planet carrier (9a) is operatively connected to the second clutch (2b) and the second sun gear (7a).

Description

The invention relates to a drive device for a motor vehicle, comprising an electrical machine.

From the DE 10 2011 088 668 A1 is a drive device with at least one electric drive machine, with at least a first planetary gear with a clutch and with a differential. A rotor shaft of the drive machine is coupled in a rotationally fixed manner to a first connection shaft of the planetary drive formed from at least three connection shafts. A second connecting shaft of the first planetary drive can be fixed against rotation against a component of the drive device by means of a shift sleeve of the shift clutch. A third connection shaft of the first planetary drive is operatively connected to a sum wave of the differential. The shift sleeve can be moved in positive engagement either with the second connecting shaft of the first planetary gear or in a torque-transmitting operative connection with the sum shaft of the differential.

The object of the present invention is to provide an alternative drive device. The object is achieved by the subject matter of patent claim 1. Preferred embodiments can be found in the dependent claims.

A drive device according to the invention for a motor vehicle comprises an electrical machine with a rotor shaft which can be connected to a transmission device via a first and a second clutch, the transmission device having a planetary gear set, a stepped planetary gear set and a differential gear, the planetary gear set comprising a first sun gear and a first ring gear and has a plurality of planet gears, which are rotatably mounted on a first planet carrier and mesh with the first sun gear and the first ring gear, the stepped planet gear set having a plurality of stepped planet gears, which are rotatably mounted on a second planet carrier, each stepped planet gear having a first and a second rotationally fixed interconnected gear, the first gear being in mesh with a second sun gear, the second gear in meshing with a second ring gear, and in which the second planet carrier with the Differential gear is operatively connected, wherein the two ring gears are fixed to the housing, wherein the first sun gear is also operatively connected to the first clutch, and wherein the first planet carrier is operatively connected to the second clutch and the second sun gear.

The term “operatively connected” is to be understood to mean that two gear elements can be directly connected to one another, or that there are further gear elements between two gear elements, for example one or more shafts or gear wheels. In particular, the first planet carrier is rotatably connected to the second sun gear. The two ring gears are fixed to the housing and are thus connected in a rotationally fixed manner to a housing of the transmission device.

The two clutches are arranged in the power flow between the rotor shaft and the planetary gear set and are intended to connect the electrical machine to the transmission device, in particular to the planetary gear set. The differential gear distributes the drive power and the drive torque of the electrical machine to a first and second output shaft. The respective output shaft is connected in particular to a respective wheel of the motor vehicle, the two output shafts forming a drive axle of the motor vehicle.

The electrical machine has a stator fixed to the housing and a rotatable rotor, the rotor being operatively connected to the two clutches via the rotor shaft. The rotor shaft thus serves as the drive shaft, which is arranged between the electrical machine and the two clutches. In particular, an actuator is provided for actuating the two clutches, the actuator initiating opening and closing of the respective clutch. The actuator can be designed to be hydraulically, electromechanically, electromagnetically or, for example, pneumatically actuated.

Closing the first clutch and opening the second clutch realizes a first gear ratio, wherein closing the second clutch and opening the first clutch realizes a second gear ratio, and opening both clutches realizes a power cut-off.

A “clutch” is to be understood as a device that has at least one open and one closed state. In particular, the two clutches are designed as power shift clutches. The two clutches are preferably combined to form a double clutch device. Alternatively, the two couplings are designed to be form-fitting.

A powershift clutch is a friction clutch that can be switched between open and closed under load. In the open state, the respective clutch does not transmit any torque. The respective clutch thus only transmits at least partially in one closed state, a torque between two shafts operatively connected to this respective clutch, the two shafts being non-rotatably connected to one another in the closed state of this respective clutch. In the closed state of the first clutch, the rotor shaft and the first sun gear are connected to one another in a rotationally fixed manner. In contrast, in the closed state of the second clutch, the rotor shaft, the first planet carrier and the second sun gear are connected to one another in a rotationally fixed manner.

According to a preferred embodiment of the invention, the differential gear is designed as a bevel gear differential. Two differential gears are rotatably mounted on a differential cage of the differential gear, which mesh with two bevel gears. The first bevel gear is rotatably connected to the first output shaft. Furthermore, the second bevel gear is rotatably connected to the second output shaft.

According to an alternative embodiment of the invention, the differential gear is designed as a spur gear differential and has two planetary gear sets, each with a plurality of first and second planetary gears. The respective planet gears of the differential gear are rotatably mounted on a differential cage of the differential gear, the differential cage being designed as a planet carrier. The first planet gears of the differential gear mesh with a first spur gear, which is non-rotatably connected to the first output shaft, the second planet gears of the differential gear mesh with a second spur gear, which is non-rotatably connected to the second output shaft. Furthermore, the first planet gears of the differential gear are in pairs with the second planet gears of the differential gear.

Two gearwheels that mesh with one another are provided for transmitting a torque and a speed from one gearwheel to the other gearwheel. A gearwheel is to be understood, for example, as a toothing, a sun gear, a ring gear, a planet gear and a pinion.

According to a preferred embodiment of the invention, the differential gear is arranged axially parallel to the planetary gear set and to the stepped planetary gear set.

According to a further preferred embodiment of the invention, the differential gear is arranged coaxially with the planetary gear set and with the stepped planetary gear set.

According to a further preferred embodiment of the invention, the differential gear is arranged transversely to the planetary gear set and to the step planetary gear set. Thus, the two output shafts of the differential gear are transverse and thus rotated by 90 ° to the planetary gear set and to the stepped planetary gear set.

According to a preferred embodiment of the invention, the second planet carrier is operatively connected to the differential gear via an angular drive. In particular, the second planet carrier is connected to a gearwheel, the gearwheel meshing with another gearwheel on the differential gear. The gearwheel on the differential gear is, for example, operatively connected to a differential carrier of the differential gear. The two gears thus form the angular drive and enable the arrangement of the differential gear transverse to the electrical machine and to the planetary gear set and to the stepped planetary gear set.

The electrical machine is preferably arranged axially parallel to the planetary gear set and to the stepped planetary gear set. In other words, the rotor shaft is axially parallel to the planetary gear set and to the stepped planetary gear set.

Alternatively, the electrical machine is arranged coaxially with the planetary gear set and with the stepped planetary gear set. In other words, the rotor shaft and the planetary gear set and the stepped planetary gear set rotate about a common axis of rotation.

According to a preferred embodiment, the rotor shaft has a first and a second pinion arranged in a rotationally fixed manner thereon, the first pinion being operatively connected to the first clutch, and the second pinion being operatively connected to the second clutch. The rotor shaft is therefore designed as a double pinion shaft. The first pinion preferably has a smaller diameter than the second pinion. In particular, the respective pinion meshes with a respective toothed coupling element of the respective coupling.

The second planet carrier is preferably connected in a rotationally fixed manner to an output gearwheel, the output gearwheel being in meshing engagement with a toothing of a differential carrier of the differential gear. Drive power is therefore fed into the differential gear arranged parallel to the axis of the electrical machine via the tooth mesh between the driven gear and the teeth on the differential cage. In particular, the driven gear is arranged axially parallel to the differential gear. The output gearwheel is preferably arranged on a common axis with the electrical machine and thus also with the rotor shaft. Alternatively, the driven gear is axially parallel arranged to the electrical machine and thus also to the rotor shaft.

• 1 eine vereinfachte schematische Darstellung zur Veranschaulichung des Aufbaus einer erfindungsgemäßen Antriebsvorrichtung gemäß einem ersten Ausführungsbeispiel,
• 2 eine vereinfachte schematische Darstellung zur Veranschaulichung des Aufbaus einer erfindungsgemäßen Antriebsvorrichtung gemäß einem zweiten Ausführungsbeispiel,
• 3 eine vereinfachte schematische Darstellung zur Veranschaulichung des Aufbaus einer erfindungsgemäßen Antriebsvorrichtung gemäß einem dritten Ausführungsbeispiel, und
• 4 eine vereinfachte schematische Darstellung zur Veranschaulichung des Aufbaus einer erfindungsgemäßen Antriebsvorrichtung gemäß einem vierten Ausführungsbeispiel.

Further measures improving the invention are shown below together with the description of four preferred exemplary embodiments of the invention with reference to the figures. It shows

• 1 1 shows a simplified schematic illustration to illustrate the structure of a drive device according to the invention in accordance with a first exemplary embodiment,
• 2nd 1 shows a simplified schematic illustration to illustrate the structure of a drive device according to the invention in accordance with a second exemplary embodiment,
• 3rd a simplified schematic representation to illustrate the structure of a drive device according to the invention according to a third embodiment, and
• 4th a simplified schematic representation to illustrate the structure of a drive device according to the invention according to a fourth embodiment.

According to the 1 , 2nd , 3rd and 4th a respective drive device according to the invention for an automobile (not shown here) has an electrical machine 1 with a rotor shaft 10th on that via a first and second clutch 2a , 2 B with a gear device 3rd is connectable. The electrical machine 1 includes a stator and a rotor. A driving power of the electrical machine 1 is about the rotor shaft 10th in the gear device 3rd initiated. Closing the first clutch 2a and opening the second clutch 2 B realize a first gear ratio. In contrast, the second clutch is closed 2 B and opening the first clutch 2a a second gear ratio. An opening of both clutches 2a , 2 B implements a power cut-off and thus disconnects the electrical machine 1 from the gear device 3rd .

The gear device 1 includes a planetary gear set 4th , a stepped planetary gear set 5 as well as a differential gear 6 . The planetary gear set 4th includes a first sun gear 7a , a first ring gear 8a and several planet gears 4a that on a first planet carrier 9a are rotatably mounted and with the first sun gear 7a as well as with the first ring gear 8a mesh with teeth. The stepped planetary gear set 5 includes several stepped planet gears 5a that are rotatable on a second planet carrier 9b are stored, each stepped planet gear 5a a first and second non-rotatably connected gear 5b , 5c having. The first gear 5b stands with a second sun gear 7b in the tooth grip and the second gear 5c stands with a second ring gear 8b in meshing. The two ring gears 8a , 8b are designed to be fixed to the housing. The second planet carrier 9b is with the differential gear 6 connected. The first sun gear 7a is with the first clutch 2a connected. The first planet carrier 9a is with the second clutch 2 B and the second sun gear 7a connected. Due to the sectional view, there is only a single planet gear 4a and a single step planet gear 5a shown. The differential gear 6 is intended to drive the electrical machine 1 on a first and second output shaft 17a , 17b the transmission device 3rd to distribute.

According to 1 is the electrical machine 1 axially parallel to the differential gear 6 arranged. Furthermore, the electrical machine 1 coaxial to the planetary gear set 4th and to the stepped planetary gear set 5 arranged. The planetary gear set 4th and the stepped planetary gear set 5 rotate about a first axis of rotation 15 . The rotor shaft 10th rotates around a second axis of rotation 16 , with the first and second axes of rotation 15 , 16 are identical. The two output shafts 17a , 17b of the differential gear 6 rotate about a third axis of rotation 18th that are parallel to the first and second axes of rotation 15 , 16 is trained. The second planet carrier 4b is non-rotatable with an output gear 11 connected, the output gear 11 with a toothing 12th a differential cage 13 of the differential gear 6 is in mesh. The output gear 11 is on the first axis of rotation 15 arranged.

According to 2nd is the electrical machine 1 axially parallel to the differential gear 6 arranged. Furthermore, the electrical machine 1 also axially parallel to the planetary gear set 4th and to the stepped planetary gear set 5 arranged. The planetary gear set 4th and the stepped planetary gear set 5 rotate one first axis of rotation 15 . The rotor shaft 10th rotates around a second axis of rotation 16 . The two output shafts 17a , 17b of the differential gear 6 rotate about a third axis of rotation 18th . The three axes of rotation 15 , 16 , 18th are formed parallel to each other. The rotor shaft 10th has a first and second sprocket rotatably arranged thereon 10a , 10b on, with the first sprocket 10a with the first clutch 2a is operatively connected, and wherein the second pinion 10b with the second clutch 2 B is connected. The second planet carrier 4b is non-rotatable with an output gear 11 connected, the output gear 11 with a toothing 12th a differential cage 13 of the differential gear 6 is in mesh. The output gear 11 is on the first axis of rotation 15 arranged.

According to 3rd is the electrical machine 1 coaxial to the planetary gear set 4th and to the stepped planetary gear set 5 arranged. The planetary gear set 4th and the stepped planetary gear set 5 rotate about a first axis of rotation 15 . The rotor shaft 10th rotates around a second axis of rotation 16 , with the first and second axes of rotation 15 , 16 are identical. The two output shafts 17a , 17b of the differential gear 6 rotate about a third axis of rotation 18th that are transverse to the first and second axes of rotation 15 , 16 is arranged. The second planet carrier 9b is about an angular drive 14 with the differential gear 6 connected. In other words, the electrical machine 1 , the planetary gear set 4th and the stepped planetary gear set 5 arranged in the longitudinal direction of the vehicle, the differential gear 6 is arranged transversely to it.

According to 4th is the electrical machine 1 axially parallel to the planetary gear set 4th and to the stepped planetary gear set 5 arranged. The planetary gear set 4th and the stepped planetary gear set 5 rotate about a first axis of rotation 15 . The rotor shaft 10th rotates around a second axis of rotation 16 . The two output shafts 17a , 17b of the differential gear 6 rotate about a third axis of rotation 18th that are transverse to the first and second axes of rotation 15 , 16 is arranged. The first and second axes of rotation 15 , 16 are formed parallel to each other. The second planet carrier 9b is about an angular drive 14 with the differential gear 6 connected. In other words, the electrical machine 1 , the planetary gear set 4th and the stepped planetary gear set 5 arranged in the longitudinal direction of the vehicle, the differential gear 6 is arranged transversely to it. The rotor shaft 10th has a first and second sprocket rotatably arranged thereon 10a , 10b on, with the first sprocket 10a with the first clutch 2a is operatively connected, and wherein the second pinion 10b with the second clutch 2 B is connected.

Reference symbol list

1

electrical machine

2a, 2b

clutch

3rd

Gear device

4th

Planetary gear set

4a

Planet gear

5

Stepped planetary gear set

5a

Stepped planet gear

5b, 5c

gear

6

Differential gear

7a, 7b

Sun gear

8a, 8b

Ring gear

9a, 9b

Planet carrier

10th

Rotor shaft

10a, 10b

pinion

11

Output gear

12

Gearing

13

Differential cage

14

Angular drive

15

first axis of rotation

16

second axis of rotation

17a, 17b

Output shaft

18th

third axis of rotation

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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.

Patent literature cited

• DE 102011088668 A1 [0002]

Claims (10)

Drive device for a motor vehicle, comprising an electrical machine (1) with a rotor shaft (10) which can be connected to a transmission device (3) via a first and second clutch (2a, 2b), the transmission device (3) having a planetary gear set (4 ), a stepped planetary gear set (5) and a differential gear (6), the planetary gear set (4) having a first sun gear (7a), a first ring gear (8a) and a plurality of planet gears (4a) which are attached to a first planet carrier (9a) are rotatably mounted and mesh with the first sun gear (7a) and the first ring gear (8a), the stepped planet gear set (5) having a plurality of stepped planet gears (5a) which are rotatably mounted on a second planet carrier (9b), each stepped planet gear (5a) has a first and a second gear (5b, 5c) connected in a rotationally fixed manner, the first gear (5b) being in tooth engagement with a second sun gear (7b), the second gear (5c) is in mesh with a second ring gear (8b), and wherein the second planet carrier (9b) is operatively connected to the differential gear (6), the two ring gears (8a, 8b) being fixed to the housing, the first sun gear (7a) also being connected the first clutch (2a) is operatively connected, and the first planet carrier (9a) is operatively connected to the second clutch (2b) and the second sun gear (7a). Drive device after Claim 1 , characterized in that the differential gear (6) is arranged axially parallel to the planetary gear set (4) and to the stepped planetary gear set (5). Drive device after Claim 1 , characterized in that the differential gear (6) is arranged coaxially to the planetary gear set (4) and to the stepped planetary gear set (5). Drive device after Claim 1 , characterized in that the differential gear (6) is arranged transversely to the planetary gear set (4) and to the stepped planetary gear set (5). Drive device after Claim 4 , characterized in that the second planet carrier (9b) is operatively connected to the differential gear (6) via an angular drive (14). Drive device according to one of the preceding claims, characterized in that the electrical machine (1) is arranged axially parallel to the planetary gear set (4) and to the stepped planetary gear set (5). Drive device according to one of the Claims 1 to 5 , characterized in that the electrical machine (1) is arranged coaxially to the planetary gear set (4) and to the stepped planetary gear set (5). Drive device according to one of the preceding claims, characterized in that the rotor shaft (10) has a first and second pinion (10a, 10b) arranged in a rotationally fixed manner thereon, the first pinion (10a) being operatively connected to the first clutch (2a), and wherein the second pinion (10b) is operatively connected to the second clutch (2b). Drive device after Claim 2 , characterized in that the second planet carrier (4b) is connected in a rotationally fixed manner to an output gear (11), the output gear (11) being in meshing engagement with a toothing (12) of a differential carrier (13) of the differential gear (6). Drive device according to one of the preceding claims, characterized in that closing the first clutch (2a) and opening the second clutch (2b) realizes a first gear ratio, wherein closing the second clutch (2b) and opening the first clutch (2a ) realizes a second gear ratio, and opening both clutches (2a, 2b) realizes a power cut-off.

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