DE102010005601A1 - Actuating device for actuating wet clutches of dual clutch arrangement of motor vehicle, has ramp devices arranged coaxial relative to each other, where roller body is arranged between ramp disks of each ramp device - Google Patents

Abstract

The device (150) has ramp devices arranged coaxial relative to each other. Each ramp device includes two ramp disks (151, 152), where a roller body (153) is arranged between the ramp disks. An electrical actuator twists the ramp disks against each other such that an axial distance of the disks is changed. The electrical actuator includes a screw drive (130) for each ramp device. The ramp devices are integrated in a component, which is supported at a clutch housing (62) by a common support device. An actuator lever is supported at the housing by an axial bearing.

Description

The The present invention relates to an actuator for a dual clutch assembly, as well as a dual clutch assembly with such an actuator.

dual clutches for motor vehicles are known. these can as double clutches with two nested couplings (the hereinafter also referred to as "partial clutches" be), which operated in a closed wet room be filled with a fluid.

modern Double clutches have i. d. R. an actuator on, which has its own clutch actuator for each of the partial clutches includes. To operate the double clutch must be the two clutch actuators to the respective engagement or release bearing act.

From the DE 10 2006 049 731 A1 a clutch actuator for a dual-clutch transmission with two clutch actuators is known, wherein a first clutch actuator a first part clutch and a second clutch actuator operates a second part clutch by acting on a first and on a second release bearing of the associated part clutch, and wherein between the clutch actuators and the release bearings each have a mechanical power transmission path is provided which has a rotary lever, wherein each rotary lever has a spherical external toothing, which is in engagement with an internally toothed receiving sleeve of the respective power transmission path.

In addition to such a mechanical actuator hydraulic actuators are known. From the non-pre-published DE 10 2008 008 457 the applicant is a wet double clutch with hydraulic actuator known. This includes hydraulic actuating pistons, through which the clutch plates are pressed together. Accordingly, a hydraulic supply of the respective hydraulic piston is necessary, which results in higher power losses compared to the mechanical actuators.

Even though mechanical actuators against lower line losses have the conventional hydraulic actuators, so is their greater space requirement due to the necessary Hebelaktuatorik disadvantageous.

It Therefore, an object of the present invention is an alternative Embodiment of the actuating device for a wet or a dry dual clutch arrangement to specify which the higher power losses of hydraulic actuators avoids and one compared to conventional mechanical Operating systems has lower space requirements.

The The aforementioned object is achieved according to the invention by an actuator for a dual clutch assembly with two coaxially arranged and nested axially biased Ramp devices, wherein each one of the axially biased Ramp device as an actuating device for provided one of the partial clutches of the dual clutch assembly is. Applied to wet double clutches, the present teaches Invention therefore, the hydraulic actuating piston in Dual clutch transmissions with wet clutches to be replaced by two axial preload units. Are the ramp means coaxial with each other and nested one inside the other arranged, so is an outer ramp device and an inner ramp device.

there Each of the ramp devices can be two ramp discs and between Having the ramp discs arranged rolling elements. By rotation of the ramp discs to each other, the rolling elements migrate (especially: rollers) the ramp surfaces of the ramp discs up. As a result, the ramp discs are separated from each other and the axial distance of the ramp discs is increased or reduced. In this process, the respective coupling engaged or disengaged. The advantage of this training is thereby in the comparatively small radial adjustment forces, the over the ramp geometry in high axial compressive forces can be implemented. In addition, the space such Aktuatorik less than the space required comparable Lever actuators.

The Actuator can also be an electrical Have actuators, with the two ramp discs of the individual Ramp devices are each rotated against each other, thereby an axial distance of the ramp discs is changeable. The construction can be significantly simplified thereby, because by an electrical actuator to an additional Hydraulics and their control for clutch operation are dispensed with can. Preferably, the electrical actuator for each of the ramp devices has its own drive (in particular: Worm drive).

The Rolling elements of the individual ramp devices can be guided in a cage. Alternatively, could also raceways for the individual rolling elements be provided along the ramp surfaces. Further alternatively every winder could over individual suspensions rotatable about the axis of rotation of the coupling be supported.

The Ramp facilities can also be a unit be integrated by a common support device is supported on the clutch housing. Here can the support means two coaxial with each other and nested cylinders, wherein the outer Ramp device between outer and inner Cylinder and the inner ramp device arranged in the inner cylinder are.

The a common or provided for each of the ramp facilities Support device can be used as a linear guide for the partial clutches facing axially movable ramp discs of serve axially biased ramp devices. In a joint Supporting device, this can preferably implemented by be that the outer cylinder is the linear guide for the corresponding axially movable ramp disc of the one Partial coupling and the inner cylinder the linear guide for the corresponding axially movable ramp disc of form another partial coupling.

each the ramp means may comprise a coupling-side thrust bearing, with which the respective ramp device against the respectively associated Partial clutch is supported, so that speed differences between ramp device and associated sub-coupling can be included.

Farther For example, each of the ramp devices may be a (clutch) housing-side Have thrust bearing with which the respective ramp device against the clutch housing is supported.

there each of the ramp means may comprise an actuator lever, the with the (clutch) housing side ramp disc of Ramp device is connected, wherein the (clutch) housing side Ramp disc is rotatably mounted on the clutch housing. Each of the actuator lever can be in the outer End have an external toothing, which with a driven element cooperates to rotate the actuator lever. Furthermore, the (clutch) housing side thrust bearing the outer ramp means on the actuator lever the inner ramp means be supported, in which case this Aktuartorhebel via another thrust bearing on the clutch housing can be supported.

The The present invention also discloses a dual clutch assembly in a drive train of a vehicle, the drive train comprises a dual-clutch transmission and at least one drive, the coupled via the dual clutch assembly with each other are, and wherein the dual clutch assembly two partial clutches and a central actuator having the features at least one of the aforementioned embodiments comprises.

there For example, the dual clutch arrangement can be designed as a wet double clutch be, wherein the actuator within the clutch housing is arranged. As a drive for the actuator lever of the axial prestressed ramp devices can each have a worm drive be provided.

The The present invention will be described below with reference to preferred embodiments in conjunction with the accompanying figures closer explained. In these show:

1 a drive train of a motor vehicle with a dual clutch arrangement with hydraulic actuators in half section,

2 a drive train of a motor vehicle with an actuating device with two coaxially arranged and nested axially biased ramp devices in half section,

3 an enlarged section according to the embodiment according to 2 in the area of the actuating device,

4 the clipping according to 3 marked with force arrows for the outer ramp device, which in this case act on the outer multi-plate clutch.

5 a three-dimensional representation of an axial biasing unit, which is used to construct the outer or inner ramp means, and

6 a schematic diagram of the operation of two ramp discs with rolling elements housed between them (preferably rollers).

In 1 is part of a powertrain 1 a motor vehicle shown. Between a drive unit 3 and a gearbox 5 is a double clutch 6 arranged in lamellar construction.

These Although design as a wet clutch is preferred in the present case. The However, the present invention presented actuator is also applicable to dry double clutches.

At the in 1 only by the reference numeral 3 indicated drive unit is, for example, an internal combustion engine from which a crankshaft emanates, preferably with the interposition of a torsional vibration damping device with an input part 8th the double clutch 6 rotatably connected.

The coupling input part 8th includes a drive hub 9 , also referred to as the 'clutch input hub'. At the clutch input hub 9 is a driver element 7 fixed substantially in the form of a radially outwardly extending annular disc, which in an outer disc carrier 10 a first multi-plate clutch assembly 11 (, outer multi-plate clutch ') passes. Radial within the first multi-plate clutch assembly 11 is a second multi-plate clutch assembly 12 ('Inner multi-plate clutch') arranged. The two multi-plate clutch arrangements 11 . 12 each comprise a disk set with inner disks and outer disks, which can be brought into frictional engagement for torque transmission.

The outer disc carrier 10 is at a detachable separation point 13 detachable but non-rotatable with a coupling part 14 connected. The detachable separation point 13 is seen in the power flow behind the first multi-plate clutch assembly 11 , ie on the transmission side, arranged.

An outer disc carrier 24 the second multi-plate clutch assembly 12 is non-rotatable with the coupling part 14 connected.

Through the coupling part 14 are the two outer disk carrier 10 and 24 rotatably connected. By the driver element 7 stand the two outer disk carrier 10 . 24 with the crankshaft of the drive unit 3 in momentary transmission connection. Based on the normal torque flow from the drive unit 3 to the gearbox 5 put the outer disc carrier 10 . 24 each as the input side of the two multi-plate clutch assemblies 11 . 12 the two partial clutches.

The coupling part 14 is present with the aid of a welded connection to a clutch hub 16 attached, which is also referred to as, piston hub '. The clutch hub 16 is by means of needle bearings 18 . 19 on the outer circumference of a first transmission input shaft 21 rotatably mounted, which is designed as a hollow shaft. Inside the hollow first transmission input shaft 21 is a second transmission input shaft 22 rotatably arranged, which is designed as a solid shaft. The second transmission input shaft 22 extends coaxially with the first transmission input shaft 21 through them.

On the second transmission input shaft 22 is by means of a keyway or the like an output hub 26 an inner disk carrier 28 the first part clutch 11 arranged rotationally fixed. Correspondingly, on the radially outer hollow first transmission input shaft 21 by means of a keyway or the like an output hub 30 an inner disk carrier 32 the second part clutch 12 arranged rotationally fixed. Based on the torque flow from the drive unit 3 towards the transmission 5 put the inner disc carrier 28 . 32 the output side of the first and second multi-plate clutch assembly 11 respectively 12 represents.

The first multi-plate clutch arrangement 11 is via an actuating piston 34 (hereinafter also referred to as pressure pot of the partial clutch K1) with the help of a in a pressure chamber 35 actuated existing hydraulic medium. The hydraulic medium becomes the pressure chamber 35 via a pressure medium channel 36 fed, the multiple axial bores 37 . 38 includes, through at least one radial bore 39 communicate with each other. The pressure medium channel 36 with the axial bores 37 . 38 and the radial bore 39 and further (unspecified) radial bores extending through the clutch hub 16 and is supplied with hydraulic medium by a hydraulic medium pump (not shown). The radial bore 39 , which the two axial bores 37 . 38 connects together, is radially outward at one point 40 by a pump drive gear 41 closed by a press fit on the clutch hub 16 is attached.

From the axial bore 38 extends a radial bore 42 radially outward into the pressure chamber 35 empties. The pump (not shown) is driven by the pump drive gear 41 driving at engine speed, powered. The second multi-plate clutch arrangement 12 is via an actuating piston 44 with the help of the hydraulic medium in a pressure chamber 45 actuated. The pressure room 45 is in the axial direction between the coupling part 14 and the actuating piston 44 arranged.

On the pump drive gear 41 is a vent axial stop 46 for the actuating piston 34 the first multi-plate clutch assembly 11 appropriate. The pump drive gear 41 also forms a fixed boundary of the pressure chamber 35 , Furthermore, the pump drive gear is 41 with a groove 47 equipped to receive a seal. Thus, the pump drive gear forms 41 a seal carrier for the fixed piston seal 48 , The pump drive gear 41 is preferably designed as a sintered part with a calibrated toothing.

The output hub 30 is in the axial direction by means of a Axialabstützeinrichtung 50 at the free end of the transmission input shaft designed as a hollow shaft 21 supported. The Axialabstützeinrichtung 50 includes a retaining ring 51 that together with a spring element 52 in a groove 54 engages the inner diameter 53 the output hub 30 is provided. The spring element 52 is in the axial direction between the locking ring 51 and the free end of the transmission input shaft 21 braced. By the Axialabstützungseinrichtung 50 of the embodiment according to 1 becomes the position of the double clutch 6 regardless of the position and any displacement of the transmission input shafts 21 . 22 ,

Between the output hub 30 and the output hub 26 is a thrust bearing 56 arranged. Between the output hub 26 and the driver element 7 or the drive hub 9 is another thrust bearing 57 arranged. Between the drive hub 9 or the driver element 7 and a clutch cover 60 is another thrust bearing 58 arranged. The clutch cover 60 is on a gearbox 62 fixed, which is a gearbox back wall 63 includes.

2 shows a drive train of a motor vehicle with a dual mass flywheel 100 , a dual clutch arrangement 1A with an actuating device 150 for the dual clutch arrangement 1A with two coaxially arranged and nested axially biased ramp devices, each with a ramp device as an actuating device for one of the partial clutches of the dual clutch assembly 150 is provided, and wherein each ramp means comprises two ramp discs and arranged between the ramp discs rolling elements.

The area of the actuator 150 is in the 3 and 4 shown enlarged, in each case only a part of the reference numerals is given to ensure the clarity of the illustrations.

Before on training according to the 2 to 4 Reference is made in detail to the general representation of an axial biasing unit according to 5 and the schematic diagram for the operation of two facing each other ramp discs referenced with interposed rolling elements. The axial preload unit comprises a first ramp disc R1 and a second ramp disc R2, between which a clamping ring is arranged with rolling elements received in these. The second ramp ring R2 is supported via a thrust bearing AL on a gear, wherein the components of the axial biasing unit are pressed against each other.

By rotating the ramp discs to each other, the rollers travel up the ramps as in 6 shown. Thereby, the ramp discs R1 and R2 are separated from each other and the axial distance of the ramp discs R1 and R2 is increased or decreased. Accordingly, such an axial preload unit (after appropriate structural adaptation) can be used as an actuating device for a clutch, wherein the ramp geometry can be adapted to desired adjustment forces.

The in 2 Part of the drive train shown as half section corresponds to the above relationship with 1 but discussed the dual clutch arrangement 1A and the actuator 150 Changes have been made. This is the clutch hub 16A according to the embodiment according to 2 much thinner, since this clutch hub 16A no longer has to be used for routing the hydraulic fluid. This results in a noticeable design simplification and a significant reduction in manufacturing costs.

The present is the clutch hub 16A Therefore, designed as a comparatively thin-walled hollow cylinder, which extends over two needle bearings on the outer transmission input shaft 21 supported. Comparable with the embodiment according to 1 However, that is the coupling part 14 with the clutch hub 16 is firmly connected, wherein the formation of the coupling part 14 in both embodiments 1 and 2 essentially corresponds.

At the coupling part 14 are in the embodiment after 2 two spring elements 110 and 120 supported, wherein the spring element 110 the pressure pot 44A the inner multi-plate clutch biased towards the transmission, and wherein the spring element 120 the pressure pot 34A the outer multi-plate clutch also biased towards the transmission. It should be noted that the coupling part 14 over the outer disc carrier 10 is connected to the output part of the dual mass flywheel for transmitting torque and axially via a needle bearing 200 on the clutch cover 60 is supported.

The actuator 150 comprises two ramp means, an outer ramp means and an inner ramp means which are arranged coaxially with one another and nested in one another and via a support means on the coupling housing 62 are supported.

The Support device comprises two coaxially arranged and nested cylinders, wherein the outer Ramp device between outer and inner Cylinder and the inner ramp device arranged in the inner cylinder are and the outer cylinder, the linear guide for the corresponding axially moved ramp disc of the ramp device one part coupling and the inner cylinder the linear guide for the corresponding axially movable ramp disc of the ramp device the other part coupling forms.

As 4 removable, is between the pressure pot 34A one partial coupling K1 and in the present case the outer ramp device a thrust bearing 164 (Thrust or release bearing) arranged so that the differential speed between the pressure pot 34A Partial clutch K1 (here: the outer part of the clutch) to the clutch-side ramp disc 161 the outer ramp device can be accommodated. The clutch-side ramp disc 161 is about the linear guide 168 guided on an outer surface of the outer cylinder of the support device. Between the clutch-side ramp disc 161 and the gear-side ramp disc 162 are rolling elements 163 taken in a cage 167 are guided. The gear-side ramp disc 162 is with an actuator lever 170 verbun the, which has a toothing in an outer region, which in the worm wheel of a worm drive 130 intervenes. Alternatively, other types of drives, such as axially moving racks, belt drives or direct electrical drives, used.

About the worm drive 130 a torque is in the actuator lever 170 initiated, via the gearbox-side ramp disc 162 , the rolling elements and the clutch-side ramp disc 161 is converted into an axial movement. Due to the resulting axial movement of the coupling-side thrust bearing 164 becomes the printhead 34A the partial clutch K1 shifted, whereby an axial force F _{ax is} generated from the torque T _act , as in 4 shown.

As 3 removable, is the pressure pot 44A the partial clutch K2 (in this case the inner multi-plate clutch) via the thrust bearing 159 (Push-in or release bearing) and the spacer ring 154 with the clutch-side ramp disc 151 in operative connection, wherein the clutch-side ramp disc 151 over the linear guide 158 is guided axially along an outer surface of the inner cylinder of the support device. Between the clutch-side ramp disc 159 and the gear-side ramp disc 152 are the rolling elements 153 arranged, which in Wälzkörperring 160 are held. The gearbox-side ramp ring 152 supports itself via the thrust bearing 155 against the support device and thus against the clutch housing. The gear-side ramp disc 152 is also equipped with an actuator lever 169 connected, which has a toothing in the outer region, which cooperates with a further worm drive, so that by the action of the worm drive of the actuator lever 169 can be twisted. Again, other drive concepts can be used here.

Due to the nested structure of the actuator, it is advantageous if the ramp ring 152 "Passed through" the outer ramp means to order the screw drive for the inner ramp means radially outside the support means can. Here, in an advantageous manner, the gearbox-side ramp disc 162 the outer ramp device via a thrust bearing 165 at the ramp ring 152 be supported, in turn, the ramp ring 152 is supported by a further thrust bearing on the clutch housing.

As set forth, the present actuating device is in particular suitable for wet double clutches, but can also at dry double clutches are adapted.

Furthermore it would be alternative to the embodiments described above also conceivable that one or both of the axially biased ramp devices each having only one ramp plate or have, then is twisted against a disc without ramps.

1A

Dual clutch assembly

3

drive unit

5

transmission

6

Double coupling

8th

introductory

9

drive hub

10

External disk carrier

11

part clutch

12

part clutch

13

separation point

14

coupling part

16

Clutch cover / clutch

16A

clutch

18

needle roller bearings

19

needle roller bearings

21

Transmission input shaft

22

Transmission input shaft

24

External disk carrier

26

drive hub

28

Inner disk carrier

30

drive hub

32

Inner disk carrier

34

actuating piston

35

pressure chamber

37

axial bore

38

axial bore

34A

pressure cooker

39

radial bore

41

Pump drive gear

42

radial bore

44

actuating piston

44A

pressure cooker

45

pressure chamber

46

Lüft-axial stop

47

groove

48

piston seal

50

support means

51

circlip

52

spring element

53

Inner diameter

54

groove

60

clutch cover

100

Dual Mass Flywheel

110

spring element

120

spring element

130

screw drive

150

actuator

151

ramp disk

152

ramp disk

153

rolling elements

160

Wälzkörperring

161

ramp disk

162

ramp disk

163

rolling elements

164

thrust

167

Cage

168

linear guide

169

actuator lever

170

actuator lever

K1

part clutch

R1

ramp disk

R2

ramp disk

AL

thrust

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102006049731 A1 [0004]
• - DE 102008008457 [0005]

Claims (10)

Actuation device for a dual clutch assembly with two coaxially arranged and intertwined nested axially biased ramp means, each one a ramp device as an actuating device for provided one of the partial clutches of the dual clutch assembly wherein each of the ramp means is two ramp discs and arranged between the ramp discs rolling elements having. Actuating device according to claim 1, with an electric actuator, with which the two ramp discs the individual ramp devices in each case against each other rotatable are, whereby an axial distance of the ramp discs changeable is, wherein the electrical actuator for each of the ramp devices has its own drive. Actuating device according to claim 1 or 2, wherein the rolling elements of each of the ramp means are guided in a cage. Actuating device according to one of the claims 1 to 3, wherein the ramp means integrated in a structural unit are by a common support on the clutch housing is supported, wherein the support means two coaxial has cylinders arranged to one another and nested one inside the other, wherein an outer ramp means between outer and inner cylinder and an inner ramp device inside Cylinders are arranged. Actuating device according to one of the claims 1 to 4, wherein the support means and the support means at the same time as a linear guide for the partial clutches facing ramp discs serves or serve, the outer Cylinder the linear guide for the corresponding axially movable ramp disc of a partial clutch and the inner Cylinder the linear guide for the corresponding form axially movable ramp disc of the other sub-coupling. Actuating device according to one of the claims 1 to 5, wherein each of the ramp means is a clutch side Thrust bearing has, with the respective ramp device against the respective part coupling is supported, or wherein each of the ramp means is a housing side Thrust bearing has, with the respective ramp device against the clutch housing is supported. Actuating device according to one of the claims 1 to 6, wherein each of the ramp means comprises an actuator lever having, with the housing-side ramp disc of Ramp devices is connected, wherein the housing-side Ramp disc is rotatably mounted on the clutch housing, wherein each of the actuator levers in the outer end region has an external toothing, which with a driven Element cooperates to twist the actuator lever, and wherein the housing-side thrust bearing of the outer Ramp device on the actuator lever of the inner ramp device is supported, and wherein this actuator lever over another thrust bearing supported on the clutch housing is. Dual clutch arrangement in a drive train, which includes a dual-clutch transmission and a drive over the dual clutch arrangement can be coupled to one another, with two Part couplings and a central actuator with the features of claims 1 to 7. Double clutch arrangement according to claim 8, which is known as wet dual clutch is formed, wherein the actuating device is disposed within the coupling housing. A dual clutch assembly according to claim 9, wherein as a drive for the actuator lever of the ramp devices in each case a worm drive is provided.