DE102015225422A1 - Disconnect coupling for a motor vehicle - Google Patents

Abstract

Disconnect coupling for coupling and decoupling a first drive unit relative to an output unit, wherein the separating clutch comprises at least one torsional vibration damper having at least an input part and an output part, which have a common axis of rotation and are rotatable relative to each other limited, as well as between the input part and the output part effective spring-damper device; wherein the input part is rotatably connected to the first drive unit, wherein the output part via a, between an open actuating position and a closed actuating position adjustable coupling device with a pulley torque-transmitting connectable, the pulley is driven by a belt through a second drive unit; wherein the belt slide with the output unit is rotatably connected, so that the output unit via the second drive unit and / or via the first drive unit is drivable.

Description

The invention relates to a separating clutch for coupling and uncoupling a first drive unit relative to an output unit, wherein the separating clutch comprises at least one torsional vibration damper having at least one input part and an output part, which have a common axis of rotation and are rotatable relative to each other limited, as well as between the Input part and the output part effective spring-damper device. The torsional vibration damper is in particular a dual-mass flywheel.

Moreover, the invention relates to a hybrid powertrain with an internal combustion engine and an electric machine.

From the DE 10 2014 203 954 A1 a coupling device is known, comprising an input side and an output side, which are arranged rotatably about an axis of rotation, and at least one first friction partner and at least one second friction partner, wherein the first friction partner is torque-connected to the input side and the second friction partner torque-connected to the output side is, the first and the second friction partners are frictionally engageable by a pressing force to transmit torque between the input side and the output side, wherein at least one spring means is provided, which is adapted to increase the contact pressure. In this way it is ensured that the contact pressure for pressing the two friction partners is increased.

From the DE 10 2012 219 028 A1 is a hybrid powertrain with an internal combustion engine and an electric machine are known, which are connected via a separating clutch with each other and with a transmission input shaft. There is proposed a planetary gear, by which an accessory can be driven by the internal combustion engine or by the electric machine.

The object of the invention is therefore to improve the said hybrid powertrains and coupling devices structurally and / or functionally. In particular, a coupling device is to be provided which makes it possible to connect an internal combustion engine to a drive train or separate it from the drive train. In this case, a flexible arrangement of the individual components of the drive train is to be made possible.

This object is achieved with a separating clutch according to the features of the independent claim. Further advantageous embodiments of the invention are specified in the dependent formulated claims. It should be noted that the features listed individually in the dependent claims can be combined in a technologically meaningful manner and define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, wherein further preferred embodiments of the invention are shown.

It is proposed a separating clutch for coupling and decoupling a first drive unit relative to an output unit, wherein the separating clutch comprises at least one torsional vibration damper, which has at least one input part and an output part, which have a common axis of rotation and limited rotatable relative to each other, as well as between the Input part and the output part effective spring-damper device. The input part is rotatably connected to the first drive unit, wherein the output part via a, adjustable between an open actuating position and a closed actuating position, coupling device with a pulley is torque-transmitting connectable. The belt pulley can be driven by a second drive unit via a belt, wherein the belt pulley can be connected in a rotationally fixed manner to the output unit so that the output unit can be driven via the second drive unit and / or via the first drive unit.

The first drive unit is in particular an internal combustion engine. The second drive unit is preferably an electric machine with a fixed stator and a rotatably arranged therein rotor. A torque is transmitted to the belt slide via a motor shaft of the electric machine. For this purpose, a circulating around the motor shaft and pulley belt (especially a chain or the like) is used. In particular, the motor shaft of the electric machine is parallel, but spaced in a radial direction, arranged to the rotation axis of input part and output part of the torsional vibration damper.

In particular, the axes of rotation of a drive shaft of the first drive unit, the torsional vibration damper, the coupling device, the pulley and a transmission input shaft are arranged coaxially with each other.

The torsional vibration damper can in particular serve to reduce torsional vibrations, which are excited by periodic processes. The torsional vibration damper may serve to reduce torsional vibrations excited by an internal combustion engine. The terms "input part" and " Output part "may be related to a line flow direction emanating from an internal combustion engine. Torsional vibration damper with spring-damper device are well known in the art (eg., Two-mass flywheels - ZMS - with primary side (input part) and secondary side (output part)).

In particular, the pulley is rotatably supported in a radial direction within the input part on the input part.

Preferably, the input part via a plurality of screws on a first drive shaft of the first drive unit is rotatably fastened.

In particular, therefore, the input part is connected in a rotationally fixed manner via screws to the first drive shaft (eg a crankshaft of an internal combustion engine). In particular, the output part is rotatably mounted on the input part via a bearing (sliding bearing, rolling bearing, etc.).

Specifically, the pulley engages around the torsional vibration damper in the radial direction, and the pulley is drivable in the radial direction outside of the torsional vibration damper and the coupling device by a belt. In particular, the pulley is a bearing (rolling bearings, plain bearings, etc). rotatably mounted on the input part.

Preferably, the pulley z. B. via a so-called flexplate (a flexible at least in one axial direction connecting element for transmitting torque between two mutually coaxially arranged shafts) and / or a gearing directly with an output, z. B. a transmission input shaft rotatably and torque transmitting connected.

Here it is proposed to arrange a coupling device between the pulley and the output part, via which the first drive unit can be coupled to the output. This arrangement makes it possible for a motor vehicle to be electrically operated via the pulley when the internal combustion engine is stationary (exclusively via the second drive unit) and that the internal combustion engine does not have to be carried along during the generator operation of the electric machine. If the torque of the electric machine is no longer sufficient, the internal combustion engine can be started conventionally via a starter or by means of the electric machine and the separating clutch. In a conventional start, the speed of the internal combustion engine after starting is adapted to that of the output (successively synchronized) and the clutch device then closed. When starting via the second drive unit (the electric machine), the clutch device is closed and the internal combustion engine is towed over the electric machine.

In particular, the clutch device is "normally closed", ie closed in the ground state. In particular, while the contact force of the friction partners is applied via a designed as a plate spring actuator. In particular, the coupling device is a multi-plate clutch with an inner basket and an outer basket, wherein the outer basket is rotatably attached to the pulley.

Preferably, the inner basket comprises a plurality of bolts which extend through the output member in an axial direction parallel to the axis of rotation, a stop for an actuator being disposed at a first end of the bolt, a pressure plate at a second end of the bolt is arranged, between the output part and the pressure plate, the friction partners (eg., The disk sets) of the coupling device are arranged; wherein the pressure plate with the bolt in a first axial direction is adjustable by the actuating element.

In particular, the bolts are arranged uniformly distributed in the circumferential direction. Each bolt extends along the axial direction between a first end and a second end. At the second end a particular annular pressure plate is arranged over the z. B. the friction plates on outer basket and inner basket along the axial direction can be frictionally connected to each other. In particular, the actuating element is arranged at the first end, that in the ground state of the coupling device, the bolt and thus the pressure plate pulls against the output part.

In particular, the bolts, against an actuating force of the actuating element, by an actuating device via the second end in a second axial direction adjustable. Such an actuating device can be actuated hydraulically, pneumatically and / or electromechanically. The actuating device comprises in particular a, preferably annular, release plate, via which the plurality of bolts against the actuating force of the actuating element in the second axial direction relative to the output part are movable. Thus, the pressure plate is moved away from the output part and the friction partners (eg the disk packs) are released.

In particular, between the output part and the pressure plate at least one, in a circumferential direction and, due to a Aufstellwinkels arranged opposite to the circumferential direction, along the axial direction extending leaf spring, which transmits a torque from the output part to the pressure plate.

In particular, the at least one leaf spring is arranged so that in the pulling operation of the first drive unit, the leaf spring is stressed by a circumferential force acting in the circumferential direction to train. A stress on the leaf spring to train causes an additional, acting here in the first axial direction, clamping force by which the pressure plate is pulled against the output part. This z. B. the disk sets of outer basket and inner basket pressed together even stronger, so that the torque capacity of the coupling device is increased.

In traction mode (the first drive unit thus transmits a drive torque to the pulley), the clutch device must be able to transmit the drive torque with a certain degree of certainty. In overrun mode, only the transmission of the engine drag torque (engine brake) is required. For this purpose, the at least one leaf spring is provided here, which reinforces the contact force of the coupling device in the train operation. This increased contact pressure is internally supported between the pressure plate and the output part. In overrun mode, the transmittable torque is reduced accordingly.

In particular, a plurality of leaf springs are arranged to form a leaf spring package. Preferably, several (preferably three) leaf springs / packages are distributed uniformly along the circumferential direction.

It is further proposed a hybrid powertrain for a motor vehicle, with an internal combustion engine as the first drive unit and an electric machine as a second drive unit, and a transmission and a disconnect clutch according to the invention, wherein the pulley of the clutch is connected via a belt with the second drive unit to transmit torque, wherein the pulley with the transmission or a transmission input shaft (here the output unit) is rotatably connected.

In particular, the pulley has a transmission side and a drive side facing the first drive unit, wherein the torsional vibration damper and the clutch device are arranged on the drive side.

More specifically, starting from the bearing on a radially inwardly facing flange of the input part, the pulley extends along the radial outward direction beyond the clutch means and the torsional vibration damper to a guide for the belt. In this case, the pulley is arranged in the axial direction between the coupling device or the output part and a transmission.

The versions of the hybrid powertrain apply equally to the separating clutch and vice versa.

The invention and the technical environment will be explained in more detail with reference to FIGS. It should be noted that the figures show a particularly preferred embodiment of the invention, but this is not limited thereto. The same components are provided in the figures with the same reference numerals. They show schematically:

1 a motor vehicle with a disconnect clutch, wherein the disconnect clutch is shown in a side view only partially and in section;

2 : the behavior of a leaf spring in Zugbetrieb the separating clutch; and

3 : the behavior of a leaf spring in overrun operation of the separating clutch.

The 1 shows a motor vehicle 35 with a separating clutch 1 , wherein the separating clutch 1 in a side view only partially and in section is shown. The separating clutch 1 serves the coupling and decoupling of a first drive unit 2 opposite an output unit 3 , wherein the separating clutch 1 a torsional vibration damper 4 includes, the at least one input part 5 and an output part 6 having. introductory 5 and output part 6 are via a spring-damper device 8th limited rotatable relative to each other, wherein the output part 6 at the entrance 5 is rotatably mounted. The entrance part 5 is about the first drive shaft 15 with the first drive unit 2 about screws 14 rotatably connected, wherein the output part 6 via a, adjustable between an open operating position and a closed operating position, coupling device 9 with a pulley 10 torque transmitting connected. The pulley 10 is about a belt 11 by a second drive unit 12 driven. The belt sliding 10 is with the output unit 3 rotatably connectable, so that the output unit 3 via the second drive unit 12 and / or the first drive unit 2 is drivable.

So here's a hybrid powertrain 34 for a motor vehicle 35 shown with an internal combustion engine 36 as the first drive unit 2 and an electric machine 37 as a second drive unit 12 , as well as a gearbox 38 as output unit 3 , The pulley 10 the separating clutch 1 is over the belt 11 with the motor shaft of the second drive unit 12 , which are axially parallel to the axis of rotation 7 the separating clutch 1 is arranged, torque-transmitting connected, wherein the pulley 10 with the gearbox 38 or a transmission input shaft 39 rotatably connected.

The pulley 10 has a gearbox side 40 and one to the first drive unit 2 pointing drive side 41 on, with the torsional vibration damper 4 and the coupling device 9 on the drive side 41 are arranged.

The pulley 10 extends, starting from the storage 46 at one in the radial direction 13 inwardly facing flange 49 of the entrance part 5 , along the radial direction 13 to the outside via the coupling device 9 and the torsional vibration damper 4 away to a leadership 42 for the belt 11 , Here is the pulley 10 in the axial direction 20 between the coupling device 9 or the output part 6 and the transmission 3 arranged.

The coupling device 9 is "normally closed", ie closed in the basic state. In this case, the contact pressure of the friction partner via an executed as a plate spring actuator 23 applied. The coupling device 9 is here as a multi-plate clutch 16 with an inner basket 17 and an outside basket 18 shown, with the outer basket 18 on the pulley 10 is rotatably attached.

The inner basket 17 includes a plurality of bolts 19 which, in a parallel to the axis of rotation 7 extending axial direction 20 through the exit part 6 extend therethrough, at a first end 21 the bolt 19 an attack 22 for the actuator 23 is arranged, wherein at a second end 24 the bolt 19 a printing plate 25 is arranged. Between the starting part 6 and the printing plate 25 are the disk packs 26 the coupling device 9 arranged; wherein by the actuating element 23 the pressure plate 25 with the bolts 19 in a first axial direction 27 is adjustable.

Bolts 19 are against an operating force 28 of the actuating element 23 , by an actuator 29 over the second end 21 in a second axial direction 30 adjustable. Such an actuator 29 can be hydraulically, pneumatically and / or electromechanically operated. The actuating device 29 includes a release plate 47 about which the majority of bolts 19 against the operating force 28 of the actuating element 23 in the second axial direction 30 opposite the starting part 6 are movable. This will be the printing plate 25 from the output part 6 moved away and the plate packs 26 ventilated.

Next are between the output part 6 and the printing plate 25 , in a circumferential direction 31 and, due to an installation angle 43 (please refer 2 and 3 ) with respect to the circumferential direction 31 , along the axial direction 20 extending leaf springs 32 (Here is a leaf spring package shown with three leaf springs 32 ), which is a torque from the output part 6 on the printing plate 25 (and vice versa) transfer.

2 shows the behavior of a leaf spring 32 in train operation 33 the separating clutch 1 The leaf spring 32 is under a set-up angle 43 opposite the circumferential direction 31 between the output part 6 and the printing plate 25 arranged and extends in the circumferential direction 31 as well as along the axial direction 20 , In train operation 33 the first drive unit 2 becomes the leaf spring 32 through one in the circumferential direction 31 acting circumferential force 44 claimed to train. A strain on the leaf spring 32 on train causes a reduction of the installation angle 43 and an additional, here in the first axial direction 27 acting, clamping force 45 through which the pressure plate 25 against the starting part 6 is pulled. This will be the disk packs 26 from outside basket 18 and inner basket 17 even more compressed with each other, so that the torque capacity of the coupling device 9 is increased.

3 shows the behavior of a leaf spring 32 in overrun mode 48 the separating clutch 1 , In overrun mode 48 only the transmission of the internal combustion engine drag torque (engine brake) is required. Here also affects a peripheral force 44 on the leaf spring 32 , causing the installation angle 43 is enlarged. The on the lamella packages 26 acting clamping force is so by an additional (but now opposite, so in the second axial direction 30 directed) clamping force 45 reduced.

LIST OF REFERENCE NUMBERS

1

 separating clutch

2

 First drive unit

3

 driven unit

4

 torsional vibration dampers

5

 introductory

6

 output portion

7

 axis of rotation

8th

 Spring-damper device

9

 coupling device

10

 pulley

11

 belt

12

 second drive unit

13

 radial direction

14

 screw

15

 first drive shaft

16

 multi-plate clutch

17

 in basket

18

 outside basket

19

 bolt

20

 axial direction

21

 first end

22

 attack

23

 actuator

24

 second end

25

 printing plate

26

 disk pack

27

 first axial direction

28

 operating force

29

 actuator

30

 second axial direction

31

 circumferentially

32

 leaf spring

33

 train operation

34

 Hybrid powertrain

35

 motor vehicle

36

 Internal combustion engine

37

 electric machine

38

 transmission

39

 Transmission input shaft

40

 transmission side

41

 driving side

42

 guide

43

 installation angle

44

 peripheral force

45

 clamping force

46

 storage

47

 release plate

48

 coasting

49

 flange

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 102014203954 A1 [0003]
• DE 102012219028 A1 [0004]

Claims (10)

Disconnect coupling ( 1 ) for coupling and decoupling a first drive unit ( 2 ) with respect to an output unit ( 3 ), wherein the separating clutch ( 1 ) at least one torsional vibration damper ( 4 ), the at least one input part ( 5 ) and an output part ( 6 ) having a common axis of rotation ( 7 ) and are rotatable relatively limited to one another, and between the input part ( 5 ) and the output part ( 6 ) effective spring-damper device ( 8th ); the input part ( 5 ) with the first drive unit ( 2 ) is rotatably connected, wherein the output part ( 6 ) via a, between an open actuating position and a closed actuating position adjustable, coupling device ( 9 ) with a pulley ( 10 ) is torque-transmitting connectable, wherein the pulley ( 10 ) via a belt ( 11 ) by a second drive unit ( 12 ) is drivable; the pulley ( 10 ) with the output unit ( 3 ) rotatably connected, so that the output unit ( 3 ) via the second drive unit ( 12 ) and / or via the first drive unit ( 2 ) is drivable. Disconnect coupling ( 1 ) according to claim 1, wherein the pulley ( 10 ) in a radial direction ( 13 ) within the input part ( 5 ) at the entrance part ( 5 ) is rotatably mounted. Disconnect coupling ( 1 ) according to one of the preceding claims, wherein the input part ( 5 ) via a plurality of screws ( 14 ) on a first drive shaft ( 15 ) of the first drive unit ( 2 ) is rotatably fastened. Disconnect coupling ( 1 ) according to one of the preceding claims, wherein the coupling device ( 9 ) a multi-plate clutch ( 16 ) with an inner basket ( 17 ) and an outer basket ( 18 ), the outer basket ( 18 ) on the pulley ( 10 ) is rotationally fixed. Disconnect coupling ( 1 ) according to claim 4, wherein the inner basket ( 17 ) a plurality of bolts ( 19 ), which, in a direction parallel to the axis of rotation ( 7 ) extending axial direction ( 20 ) through the output part ( 6 ), wherein at a first end ( 21 ) the bolt ( 19 ) an attack ( 22 ) for an actuating element ( 23 ) is arranged, wherein at a second end ( 24 ) the bolt ( 19 ) a printing plate ( 25 ) is arranged, between the output part ( 6 ) and the pressure plate ( 25 ) the friction partners of the coupling device ( 9 ) are arranged; wherein by the actuating element ( 23 ) the pressure plate ( 25 ) with the bolts ( 19 ) in a first axial direction ( 27 ) is adjustable. Disconnect coupling ( 1 ) according to claim 5, wherein the bolts ( 19 ), against an actuating force ( 28 ) of the actuating element ( 23 ), by an actuating device ( 29 ) over the first end ( 21 ) in a second axial direction ( 30 ) are adjustable. Disconnect coupling ( 1 ) according to one of the preceding claims 5 or 6, wherein between the output part ( 6 ) and the pressure plate ( 25 ) at least one, in a circumferential direction ( 31 ) and, due to an installation angle ( 43 ) with respect to the circumferential direction ( 31 ), along the axial direction ( 20 ) extending leaf spring ( 32 ) is arranged, the torque from the output part ( 6 ) on the printing plate ( 25 ) transmits .. Disconnect coupling ( 1 ) according to claim 7, wherein the at least one leaf spring ( 32 ) is arranged so that in train operation ( 33 ) of the first drive unit ( 2 ) the at least one leaf spring ( 32 ) is claimed to train. Hybrid powertrain ( 34 ) for a motor vehicle ( 35 ), with an internal combustion engine ( 36 ) as the first drive unit ( 2 ) and an electric machine ( 37 ) as a second drive unit ( 12 ), as well as a transmission ( 38 ) and a separating clutch ( 1 ) according to one of the preceding claims, wherein the pulley ( 10 ) of the separating clutch ( 1 ) via a belt ( 11 ) with the second drive unit ( 12 ) is connected to transmit torque, wherein the pulley ( 10 ) with a transmission input shaft ( 39 ) of the transmission ( 38 ) is rotatably connected. Hybrid powertrain ( 34 ) according to claim 9, wherein the pulley ( 10 ) a transmission side ( 40 ) and one to the first drive unit ( 2 ) facing drive side ( 41 ), wherein the torsional vibration damper ( 4 ) and the coupling device ( 9 ) on the drive side ( 41 ) are arranged.

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