DE102016217607A1 - Electric axle assembly with fully integrated clutch - Google Patents

Abstract

The invention relates to an electric axle arrangement (1) for a motor vehicle, having a double clutch device (4) having a wet running and two partial clutches (2, 3) and an electric machine (7) having a stator (5) and a rotor (6) Rotor (6) with a rotary part (8, 9) of a first part clutch (2) and / or a second part clutch (3) of the dual clutch device (4) is rotationally coupled, wherein each of the partial clutches (2, 3) both in the radial direction and at least partially disposed in the axial direction with respect to an axis of rotation (10) within the rotor (6) of the electric machine (4); and a dual-clutch transmission or a drive train (23) with such an axle arrangement (1).

Description

The invention relates to an electrical axle assembly (alternatively referred to as E-axis / electrical axis) for a drive train of a motor vehicle, such as a car, truck, bus or other commercial vehicle, with a wet-running / wet and two part clutches having double clutch device and a stator and a rotor having an electric machine, wherein the rotor is rotationally coupled to a rotary part of a first part clutch and / or a second part clutch of the double clutch device. Furthermore, the invention relates to a dual-clutch transmission with such an electric axle assembly and a drive train of a hybrid motor vehicle / hybrid vehicle with the axle assembly or a dual-clutch transmission having the axle assembly.

Generic prior art is in principle from the DE 10 2010 050 217 A1 known. Hereby is an electrical axle for a motor vehicle, comprising an electric machine having a stator and a rotor, with at least one transmission having an input member connected to the rotor and at least one output member having a differential for distributing drive power to two Output shafts is connectable, wherein the transmission is adapted to set up at least two different translations, and disclosed with a housing.

In these known from the prior art embodiments, it has been found to be disadvantageous that they require a relatively large amount of space. In particular, these embodiments take relatively large axial spaces. However, the designs must also have a certain diameter in order to reliably transmit the required torques.

It is therefore an object of the present invention to remedy these known from the prior art disadvantages and to provide an electrical axis arrangement available, on the one hand designed to save space, on the other hand, however, should also be used as variable as possible.

This is inventively achieved in that each of the partial clutches is arranged both in the radial direction and at least partially in the axial direction with respect to an axis of rotation (the dual clutch device / the electric axle assembly) within the rotor of the electric machine.

This results in a clever, nested construction that can be used in various ways in the transmission or in the drive train.

Further advantageous embodiments are claimed in the subclaims and explained in more detail below.

Are / is the first part clutch and / or the second part clutch formed as a multi-plate clutch / -en, the space requirement of the part clutches is further reduced.

In this context, it is particularly advantageous if the first part clutch and / or the second part clutch has a plurality of friction elements, which are arranged in the axial direction completely within two opposite end faces of the rotor. This also further focuses the compact design.

If the friction elements of the first and second sub-clutches are arranged at the same height in the radial direction, a particularly compact design is made possible.

It is also expedient if a first switching actuator operating the first partial clutch is integrated (preferably completely) in a housing of the electric machine. As a result, the operation of the respective partial clutches is particularly cleverly integrated into the axle assembly.

In this context, it is also expedient if the first switching actuator has a slave cylinder, which is integrated in the housing.

If a second switching actuator activating the second partial clutch continues to be integrated (preferably completely) in a housing or a housing-fixed region of the electric machine, the switching actuator responsible for the second partial clutch is also arranged in a particularly space-saving manner.

In this context, it is also again advantageous if the second Schaltaktorik has a slave cylinder, which is integrated in the housing or the housing-fixed area.

Furthermore, the invention relates to a dual-clutch transmission with an axle assembly according to at least one of the embodiments described above, whereby a power shift transmission with fully integrated clutch / double clutch is effectively formed.

In addition, the invention relates to a drive train for a hybrid vehicle, with an axle assembly according to one of the embodiments described above or a dual-clutch transmission with this axle assembly.

In this regard, it is particularly advantageous if a differential, preferably a spur gear, is provided, which is rotatably / rotationally coupled to an output of the axle assembly or the dual clutch transmission.

In other words, an E-axis having a 2-speed powershift transmission with fully integrated clutch is thus implemented. The electric axle assembly thus includes a fully integrated power shift clutch (dual clutch device). According to the invention, the electrical axle arrangement has a wet / wet double clutch device with a first clutch and a second clutch. Each of the first and second clutches is arranged on the one hand radially and at least partially in the axial direction within a rotor of an electric machine of the electric axle arrangement.

The invention will now be explained in more detail below with reference to a figure in a preferred embodiment.

It shows the only one 1 a schematic longitudinal sectional view through a drive train having an inventive electric axle assembly according to a preferred embodiment, in particular, the structure of the axle assembly is clearly visible.

The figure is merely schematic in nature and is for the sole purpose of understanding the invention.

In 1 is an electrical axis arrangement according to the invention 1 in a drive train 23 a hybrid vehicle / hybrid motor vehicle already used. In addition to the electrical axis arrangement 1 are schematically two switching stages 25 an additional transmission device and a differential 24 illustrated. The differential 24 is about the switching stages 25 with the axle arrangement 1 ie with the respective part coupling 2 . 3 the axle arrangement 1 , as explained in more detail below, coupled on the output side. In addition to the axle arrangement 1 are thus a differential 24 as well as two switching stages 25 In the form of the transmission device, for example. A planetary gear, alternatively in the form of a spur gear, in the drive train 23 contain. Also, the switching stages 25 / the gearbox and the differential 24 directly part of the axle arrangement 1 be, this assembly is also referred to as E-axis.

The electric axis arrangement 1 is in 1 In the structure particularly well recognizable. The axle arrangement 1 is with an electric machine 7 / equipped with an electric motor. The electric machine 7 again has a stator 5 on that in a housing 19 the axle arrangement 1 firmly attached. The housing 19 is in operation with a solid component, eg. With a vehicle frame fixed component of the motor vehicle, further connected. Next to the stator 5 instructs the electric machine 7 one through the stator 5 drivable rotor 6 on, freely rotatable to the stator 5 is included.

In addition, the axle arrangement 1 a double clutch device 4 on, which is also simplified as a double clutch. The double clutch device 4 has a first part clutch 2 and a second part clutch 3 on. A first turned part 8th the first part clutch 2 is non-rotatable with a first rotating part 9 the second part clutch 3 connected. Both first turned parts 8th and 9 are in operation relative to the housing 19 rotatable about the axis of rotation 10 stored and preferably further rotatably connected to an internal combustion engine / internal combustion engine of the vehicle. The first two turned parts 8th and 9 are formed so that they on their radially outer peripheral side directly the rotor 6 take up. The two partial clutches 2 and 3 Both are completely radial within the rotor 6 arranged.

In addition to the first turned parts 8th and 9 has each partial clutch 2 and 3 a second rotary part 11 respectively. 12 on. A second turned part 11 the first part clutch 2 is on with a first connection wave 26 namely, a first transmission input shaft of a first shift stage 25 , and a second rotary part 12 the second part clutch 3 with a second connecting shaft 27 namely, a second transmission input shaft of a second shift stage 25 , rotatably connected.

Both partial clutches 2 and 3 are designed as multi-plate clutches. In addition, the two part clutches 2 and 3 wet running trained. For this purpose, the interior forms 28 of the housing 19 a wet room, within which the partial clutches 2 and 3 with their turned parts 8th and 9 , at least partially, are arranged. In particular, the respective partial clutches 2 and 3 with their friction elements 13a . 14a such as 13b . 14b in this interior 28 / Wet room arranged. The double clutch device 4 is therefore running wet running overall.

As a result of the versions of the partial clutches 2 . 3 as multi-plate clutches are the respective friction elements 13a and 13b respectively. 14a and 14b the two partial clutches 2 and 3 designed as friction plates. Several first friction elements 13a / a first group of friction elements 13a the first part clutch 2 are rotationally fixed part of the first turned part 8th the first part clutch 2 , In particular, the first friction elements 13a in the axial direction with respect to a rotation axis 10 of the Dual clutch assembly 4 / the axle arrangement 1 slidably received each other. Between each two adjacent arranged first friction elements 13a is in each case a second friction element 14a the first part clutch 2 arranged. The first and second friction elements 13a and 14a the first part clutch 2 thus alternate in the axial direction. The second friction elements 14a are in turn rotationally fixed with the second rotary part 13 connected or rotationally fixed part of the second rotating part 11 and axially displaceable relative to each other.

The second part clutch 3 is according to the first partial clutch 2 built up. Therefore, the friction elements 13b and 14b the second part clutch 3 according to the friction elements 13a and 14a the first part clutch 2 trained and arranged. Consequently, also has the second part clutch 3 on the first rotary part 9 several first friction elements 13b on, extending in the axial direction with second friction elements 14b on the second rotary part 12 alternate. As in 1 also to recognize, are the friction elements 13a . 13b . 14a . 14b so stacked in the axial direction and dimensioned that they both in an engaged position of the respective sub-coupling 2 . 3 , as well as in a disengaged position of the respective part clutch 2 . 3 always completely in the axial direction within two opposite end faces 15 . 16 of the rotor 6 are arranged.

From the second friction elements 13b and 14b the respective second rotary part extends 11 respectively. 12 in the radial direction inwards to the respective connecting shaft 26 . 27 out. Here, the second rotating parts extend 11 . 12 by a fluid, such as oil, to cool the friction elements 13a . 13b . 14a . 14b in operation having interior 28 ,

Furthermore, each partial clutch 2 . 3 an actuated Schaltaktorik 17 respectively. 18 intended. The first switching actuator 17 and the second Schaltaktorik 18 are in this embodiment in the housing 19 or a housing-fixed area 22 ie an area that is fixed to the housing 19 is further connected, arranged.

The first switching actuator 17 is with her (first) slave cylinder 20 in a radially inwardly extending first side wall 29 of the housing 19 integrated. Here is a first actuating piston 31 the first Schaltaktorik 17 / of the first slave cylinder 20 slidable on one's interior 28 facing side of the first side wall 29 slidably received. To the first actuating piston 31 closes an actuation bearing 33 the first Schaltaktorik 17 on, with the actuating bearing 33 further displaced with an axially displaceable first actuator 34a is coupled. The first control element 34a in turn acts on at least one friction element 13a respectively. 14a shifting one that they are the friction elements 13a and 14a in the engaged position of the first part clutch 2 frictionally engaged with each other and in the disengaged position of the first part clutch 2 is positioned without pressure, so that the friction elements 13a and 14a freely rotatable relative to each other.

According to the first Schaltaktorik 17 the second switching actuator works 18 , the second part clutch 3 assigned. A second side wall 30 is through the housing-fixed area 22 formed, wherein the second Schaltaktorik 18 in this second side wall 30 is integrated. On one the interior 28 turn facing side of the second side wall 30 is a second actuating piston 32 a (second) slave cylinder 21 the second Schaltaktorik 18 slidably guided. The second actuating piston 32 acts with a (second) actuator bearing 33b together, in turn, with a (second) actuator 34b shift-proof is coupled. Depending on the second Schaltaktorik 18 is thus again in an engaged position of the second part clutch 3 the group of the first friction elements 13b with the group of second friction elements 14b frictionally engaged and the friction elements 13b and 14b in a disengaged position of the second part clutch 3 freely rotatable to each other.

The axle arrangement 1 is furthermore with combination of the switching stages 25 also as a common unit in the form of a dual-clutch transmission trainable. This is merely indicated schematically for the sake of simplicity.

The powertrain 23 The inventive construction thus preferably has an axis arrangement 1 in a dual clutch transmission, this dual clutch transmission in turn with a differential 24 , preferably in the form of a spur gear, is further rotationally coupled.

In other words, is thus implementable by the embodiment according to the invention switching without Zugkrafteinbruch. A hybrid module (axle arrangement 1 ) is equipped with a fully integrated switching actuator 17 . 18 implemented. By translations of the planetary gear set (switching stages 25 ) are high speeds of the electric motor 7 possible. The design can be an integrated spur gear differential 24 include. As a result, a simple pre-assembly in units as sub-assembly is possible. The rotor motor 7 thus preferably has a fully integrated clutch 4 which is ideal for driving in the smallest cars. As a result, in particular, a compact / small and lightweight single-shaft transmission can be implemented for a space-saving application.

LIST OF REFERENCE NUMBERS

1

 axle assembly

2

 first part clutch

3

 second part clutch

4

 Dual clutch assembly

5

 stator

6

 rotor

7

 electric machine

8th

 first rotary part of the first part clutch

9

 first rotary part of the second partial clutch

10

 axis of rotation

11

 second rotary part of the first part clutch

12

 second rotary part of the second partial clutch

13a

 first friction element of the first part clutch

13b

 first friction element of the second part clutch

14a

 second friction element of the first part clutch

14b

 second friction element of the second part clutch

15

 first end face

16

 second end face

17

 first switching actuator

18

 second switching actuator

19

 casing

20

 first slave cylinder

21

 second slave cylinder

22

 housing-proof area

23

 powertrain

24

 differential

25

 switching stage

26

 first connecting shaft

27

 second connecting shaft

28

 inner space

29

 first side wall

30

 second side wall

31

 first actuating piston

32

 second actuating piston

33a

 first actuation bearing

33b

 second actuation bearing

34a

 first actuator

34b

 second actuator

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 102010050217 A1 [0002]

Claims (10)

Electric axle arrangement ( 1 ) for a motor vehicle, with one wet-running and two partial clutches ( 2 . 3 ) having double clutch device ( 4 ) as well as a stator ( 5 ) and a rotor ( 6 ) having electric machine ( 7 ), wherein the rotor ( 6 ) with a rotating part ( 8th . 9 ) a first partial clutch ( 2 ) and / or a second partial clutch ( 3 ) of the dual clutch device ( 4 ) is rotationally coupled, characterized in that each of the partial couplings ( 2 . 3 ) both in the radial direction and at least partially in the axial direction with respect to a rotation axis ( 10 ) within the rotor ( 6 ) of the electric machine ( 4 ) is arranged. Axis arrangement ( 1 ) according to claim 1, characterized in that the first part clutch ( 2 ) and / or the second partial clutch ( 3 ) are designed as a multi-plate clutch / is. Axis arrangement ( 1 ) according to claim 1 or 2, characterized in that the first part clutch ( 2 ) and / or the second partial clutch ( 3 ) a plurality of friction elements ( 13a . 14a ; 13b . 14b ), which in the axial direction completely within two opposite end faces ( 15 . 16 ) of the rotor ( 6 ) are arranged. Axis arrangement ( 1 ) according to one of claims 1 to 3, characterized in that a the first part clutch ( 2 ) confirming first switching actorics ( 17 ) in a housing ( 19 ) of the electric machine ( 7 ) is integrated. Axis arrangement ( 1 ) according to claim 4, characterized in that the first switching actuator ( 17 ) a slave cylinder ( 20 ), which in the housing ( 19 ) is integrated. Axis arrangement ( 1 ) according to one of claims 1 to 5, characterized in that a second partial coupling ( 3 ) confirming second switching actorics ( 18 ) in the housing ( 19 ) or a housing-fixed area ( 22 ) of the electric machine ( 7 ) is integrated. Axis arrangement ( 1 ) according to claim 6, characterized in that the second switching actuator ( 18 ) a slave cylinder ( 21 ), which in the housing ( 19 ) or the housing-fixed area ( 22 ) is integrated. Dual-clutch transmission with an axle arrangement ( 1 ) according to one of claims 1 to 7. Powertrain ( 23 ) for a hybrid vehicle, with an axle arrangement ( 1 ) according to one of claims 1 to 7 or a dual-clutch transmission according to claim 8. Powertrain ( 23 ) according to claim 9, characterized in that furthermore a differential ( 24 ) provided with an output of the axle assembly ( 1 ) or the dual-clutch transmission is coupled.

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