DE102010023716A1 - Double coupling - Google Patents

Abstract

The present invention relates to a dual clutch with two clutches K1 and K2, via the input shafts of a dual-clutch transmission with an output shaft of a drive unit are each connectable and a method for assembling such a double clutch.

Description

The The present invention relates to a dual clutch with two clutches K1 and K2, via the input shafts of a dual-clutch transmission with an output shaft of a drive unit are each connectable and a method for assembling such a dual clutch.

From the EP 0 185 176 A1 is a double clutch for a motor vehicle in conjunction with hydraulic actuators for both clutches known. These two hydraulic actuators are combined into a central actuator which is secured to the transmission housing. The actuating forces of both clutches act in the direction of the crankshaft. Accordingly, these actuating forces must be supported on the crankshaft bearing.

The above hang a clutch transmissible torques thereby from the operating forces, with which pressed the pressure plate of the clutch against the counter pressure plate becomes. At high torques to be transmitted are too correspondingly high operating forces to be applied required. For example, in truck applications up to 3,300-3,500 Nm torque to transfer. To transfer this Moments are disengaging forces up to 12.400-15.000 N necessary.

Would like to you just for such truck applications a double clutch of the type mentioned above, so would the crankshaft bearing or a corresponding gear bearing these actuating forces bear. Is the actuator on a clutch cover arranged, so should even with a clutch internally closed course of force passed over the cover bearing become. Error in centric alignment of cover bearing to the crankshaft or to the transmission input shafts can this lead to technical problems.

It It is therefore an object of the present invention to provide a structure a double clutch with a cover bearing for the storage of the actuator to improve.

These The object is achieved by a double clutch with two clutches, via the input shafts a dual-clutch transmission with an output shaft of a drive unit respectively connectable, and with an actuator, the one on a clutch cover one of the clutches arranged lid bearing is supported and wherein a Connection of the cover bearing in the clutch cover a radial clearance and means for generating a radial biasing force is provided, so that the cover bearing on the radial Biasing force is centered in conjunction with the radial clearance.

preferred Embodiments are the subject of the dependent Claims.

It Another object of the present invention is a method for cost-effective and easy installation of a double clutch or a dual-clutch transmission with a double clutch in to specify a drive train of a vehicle.

These The object is achieved by a method for assembling a dual clutch, wherein a preassembly assembly consisting of two couplings, connected via the common Central plate and from the cover fixed arranged actuator is assembled, wherein a one-piece or multi-piece flywheel is connected to a drive shaft of a drive unit, and wherein the central plate as part of this pre-assembly over Centering screws with the one-piece or multi-part flywheel is connected.

preferred Further developments are the subject of the dependent claims.

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 half section of an embodiment of the present double clutch with two pressed in the ground state open couplings and a cover-fixed double CPCA, the drive-side clutch K1 closed and the transmission-side clutch K2 are open,

2 a representation of the closed within the clutch assembly power flow of the actuating force upon actuation of the drive-side clutch K1, in the state according to 1 .

3 a half section of the embodiment of the present double clutch with two pressed in the ground state open couplings and a cover-fixed double CPCA, the drive-side clutch K1 open and the transmission-side clutch K2 are closed,

4 a representation of the closed in the coupling unit power flow of the actuating force upon actuation of the transmission-side clutch K2, in the state according to 3 .

5 a half section through another embodiment of the present Doppelkupp with self-centering function for the cover bearing and

6a a detailed representation of the cover bearing with Selbstzentrierfunktion in the installed state of the double clutch after 5 .

6b an illustration of the installation situation of the cover bearing without Selbstzentrierfunktion in the embodiment according to 1 and 3 and

7 a representation of the double clutch after 1 . 3 or 5 in the assembled state with pre-assembly module and drive plate bolted to the coupling before inserting the centering screws.

The present embodiments of the double clutch are especially suitable for vehicles with a compressed air system, So for example for trucks.

1 shows schematically the construction of a dual clutch with pneumatically actuated central release unit for both clutches (K1: drive-side clutch and K2: transmission-side clutch), which is used in vehicles with compressed air systems.

The present double clutch is in the drive train of a vehicle between a drive (such as internal combustion engine) and a dual-clutch transmission arranged between the drive and the double clutch furthermore a torsional vibration damper element, such as a dual-mass flywheel, can be arranged (but not necessarily).

The dual clutch construction 1 comprises the drive-side clutch K1 and the transmission-side clutch K2, wherein the designation "drive-side" and "gear-side" of the arrangements of the clutches K1 and K2 on opposite sides of a central plate 10 owed, as further described below.

This central plate 10 is here about in 7 shown centering screws 51 on a flywheel (also called "drive plate") 11 attached, this flywheel 11 via screw connections 12 at one (in 1 not shown in detail) crankshaft of an internal combustion engine can be fastened. Radial outside is on the flywheel 11 a starter ring gear 13 arranged.

The drive-side partial clutch K1 also includes a pressure plate 21 which over in 3 shown leaf spring packages 52 with the central plate 10 connected, causing the pressure plate 21 rotationally fixed in the circumferential direction, but axially displaceable relative to the central plate 10 is. Between pressure plate 21 and central plate 10 is a friction lining of a drive-side clutch disc 20 arranged, wherein the drive-side clutch disc 20 may have a torsional vibration damper.

The transmission-side clutch K2 comprises a pressure plate 31 , which about leaf spring packages 53 with the central plate 10 is connected so that it rotatably in the circumferential direction, but axially displaceable relative to the central plate 10 is. Between pressure plate 31 and central plate 10 is a friction lining of a clutch disc 30 the clutch K2 arranged.

The clutch disc 20 the drive-side clutch K1 is connected via a toothing with a in 1 not shown formed as a solid shaft transmission input shaft of a subsequent dual-clutch transmission connected.

The transmission-side clutch disc 30 is connected via a toothing with a trained as a hollow shaft second transmission input shaft of the following dual-clutch transmission.

The double clutch 1 further includes a tie rod 22 that has screw connections 23 made of spacers 23a and screws 23b exist, with the pressure plate 21 the drive-side clutch K1 connected.

The transmission-side clutch K2 comprises a clutch cover 32 , which has more screw connections 33 consisting of spacers and screws (corresponding to the connections described above 23 ) on the central plate 10 is attached.

The clutch cover 32 the transmission-side clutch K2 is in this case produced in a stamping embossing process and comprises in an outer region two first bending radii 34a . 34b , so the clutch cover 32 has a "pot-like" outer area. Within this pot-like area is a first bearing ring 35 arranged, which an outer support for the lever spring 36 forms.

Radial within the first support ring 35 contacts the lever spring bearing areas 31b attached to the pressure plate 31 the coupling K2 are formed.

Radial in the bearing areas 31b contacts the lever spring 36 an engagement bearing 41 which has an inner piston 42 axially displaceable, wherein the inner piston together with an inner cylinder 43 , a floor plate 44 and one guide sleeve 46 a pressure chamber 45 the actuator of the transmission-side clutch K2 limited. Here is the inner piston 42 on the guide sleeve 46 formed axially displaceable, wherein the inner piston via sealing elements against the inner cylinder 43 and sealed against the guide sleeve.

The inner piston 42 forms in connection with the inner cylinder 43 , the floor area 44 and the guide sleeve 46 the first actuator of the actuator 40 , wherein this first actuating device via the actuating bearing 41 on the lever spring 36 acts, which the force generated by the first actuator on the pressure plate 31 the clutch K2 transmits.

The tie rod 22 the drive-side clutch K1 has (comparable to the clutch cover of the clutch K2) two deformed radii, so that the radially outer region of the tie rod 22 also receives a cup-like training. In the field of this cup-like training is a second bearing ring 24 arranged on which a radial outer portion of the lever spring 25 is applied.

Radial within this bearing point on the support ring 24 is the lever spring 25 on as rivets serving rivets (which are also referred to as "hammer head rivets") held th, so that the lever spring 25 about this bedding 26 can pivot. The hammer head rivets are here on the clutch cover 32 supported.

Radial inside is the lever spring 25 at the engagement bearing 47 on, which via the outer actuating piston 48 is axially displaceable. The outer piston 48 limited together with the outer cylinder 49 , the bottom plate 44 and the inner cylinder 43 another pressure chamber 50 , which can be pressurized from the outside. Here is the outer piston 48 axially displaceable on the cylinder 43 stored, the pressure chamber 50 is sealed by seals.

The outer piston 48 forms together with the outer cylinder 49 , the bottom plate 44 and the cylinder 43 the second actuator of the actuator 40 , whereby over displacement of the outer piston 48 the actuation bearing 47 moved axially and accordingly the lever spring 25 around the Auflagerung 26 is pivoted around. Because of this pivoting around the support 26 becomes the tie rod 22 axially displaced, whereby the pressure plate 21 the clutch K1 is displaced.

Both Clutches K1 and K2 are open in the ground state.

If no pressure corresponding to the actuators of the actuation system 40 created, so are the pressure plates 21 and 31 from the central plate 10 over the respective leaf spring packets ( 52 . 53 ) spaced that the clutch discs 20 and 30 can rotate freely.

Is accordingly in one or both pressure chamber 45 and 50 Pressure applied, then the pressure plates 21 respectively. 31 towards the central plate 10 shifted and at a corresponding pressure level, the pressure plates 20 and 30 clamped, reducing torque from the central plate 10 in the respective transmission input shafts can be introduced.

The clutch cover 32 The coupling K2 has two further radii in a radially inner region 34c and 34d so that in comparison to the pot-like formation of the radially outer region, an elevated radially inner region is formed, wherein in the present case no closed raised inner region is formed, but individual bent tabs 35 generated by a punching / embossing process, which along a circumference of a central opening in the clutch cover 32 are arranged.

These tabs 35 are via riveted joints (alternatively: screwing, caulking, welding or other types of connection) with a support element 36 connected. Accordingly, the support element 36 over the clutch cover 32 and the screw connections 33 at the central plate 10 and about the centering screws 51 at the driveplate 11 and supported accordingly on the crankshaft.

The support element 36 In a radially inner region, a hub region comprises a bearing outer ring of a cover bearing 37 receives.

Here is the bearing outer ring of the cover bearing 37 in the hub area of the support element 36 according to the training 1 and 3 firmly arranged over the recess 38a and the circlip 38b ,

The bearing inner ring of the cover bearing 37 is with the guide sleeve 46 the direction of actuation 40 over a sleeve 39 connected.

The cover bearing 37 Accordingly, forms a fixed bearing, which is the actuator 40 outsourced. Therefore, the actuator is 40 fully supported on the crankshaft.

In 2 is the power flow when operating the clutch K1 shown. This is a pressure P2 to the pressure chamber 50 created. The resulting Force flows over the outer piston 48 , the engagement warehouse 47 , the lever spring 25 , the tie rod 22 , the screw connections 23 , the pressure plate 21 , the friction area of the clutch disc 20 , the central plate 10 , the screw connections 33 , the clutch cover 32 , the support element 36 , the cover bearing 47 and the guide sleeve 46 in the bottom plate 44 , Accordingly, the starting point and end point of the force flow is the pressure chamber 50 the actuator of the drive-side clutch K1. The power flow is closed within the dual clutch, whereby a force effect on actuation of the clutch K1 can be avoided on the crankshaft bearing.

In 3 is the double clutch after 1 and 2 shown in another operating state in which the drive-side clutch K1 open and the transmission-side clutch K2 are closed, and correspondingly applied to the actuating device of the clutch K2 an actuating pressure P1, whereas no actuating pressure is applied to the actuating device of the clutch K1.

In 4 is the power flow for the dual clutch in the operating state after 3 illustrated by the solid thick line upon actuation of the actuator of the clutch K2, which upon application of the pressure P1 by displacement of the inner piston 42 along the guide sleeve 46 arises. The power flow flows accordingly from the inner piston 42 via the actuation bearing 41 , the lever spring 36 , the pressure plate 31 , the friction area of the clutch disc 30 , the central plate 10 , the screw connections 23 , the clutch cover 32 , the support element 36 and the actuator bearing in the guide sleeve 46 , which in turn is connected to the bottom plate. Accordingly, the starting point and end point of the force flow is the pressure chamber of the first actuation, so that the force flow of the actuation force is closed within the dual clutch, whereby no force is exerted on the crankshaft and thus on the crankshaft bearing.

In 5 is another double clutch 2 indicated, as far as possible the double clutch 1 equivalent. Accordingly, reference is made in full to the foregoing. In addition to this is on the storage of the cover bearing 37 pointed.

Here is a radial play 100 provided in conjunction with a spring element 101 , Due to the combination of the radial play 100 with the radially acting spring 101 there is an additional self-centering. This allows a radial compensation possibility that may possibly occur due to imbalance of the double clutch, different friction on the lever spring tongues, or by tolerance compensation. Accordingly, the axis of the dual CPCA may shift relative to the axis of the dual clutch module and self-centering may occur.

In 6A this self-centering device is shown enlarged again and over 6B with the training of storage after 1 and 3 compared.

The above embodiments accordingly show a double clutch with cover fixed double CPCA in conjunction with two compressed Normally Open couplings. Here are both couplings with lever spring (alternatively, if necessary, also plate springs conceivable) provided. In addition, the cylinders of the actuators of the actuator 40 and the engagement bearing (actuator bearing) designed for depressed couplings. Furthermore, the double-CPCA is fixed to the fixed cover of the coupling K2, for example riveted, screwed or welded. Due to the cover fixed bearing the double CPCA is relative to the double clutch, so that an air supply is possible.

The Cover bearing is axially fixed so that small tolerances together come, but in particular no axial play.

The The above description accordingly discloses u. a. a dual-clutch module with an integrated cover-resistant double CPCA, where the actuation forces at the crankshaft are reduced to zero, since the power flow for both clutches are dual clutch module internal closed. in this connection is the cover fixed bearing between the clutch disc of Clutch K2 and lever spring of clutch K2. The cover bearing is Tied to the lid of the clutch K2, to tabs, which through Window, which are formed in the lever spring, reach through. This arrangement allows the use of a small warehouse (Cost savings, low slip torque, better service life). The cover-resistant bearing can be configured with a self-centering become.

A method for assembling the double clutch of the type described above is in 7 shown, wherein in a first step, a preassembly assembly consisting of two clutches K1 and K2, connected via the common central plate 10 , and is assembled from the cover fixedly arranged actuator, and the one-piece or multi-part flywheel (eg., A dual-mass flywheel) is connected to a drive shaft of a drive unit, and wherein in a second step, the central plate 10 as part of this preassembly assembly via centering screws 51 is connected to the one-piece or multi-part flywheel. Before connecting the pre-assembly Assembly with the flywheel, the preassembly assembly can be connected to a transmission by the transmission input shafts of the transmission are connected to the clutch plates. It therefore results in a very simple mounting option for the dual clutch, in particular because the mounting to the engine from the side of the transmission is possible.

The The above description also teaches, among other things, a double clutch with two compressed and in the ground state open clutches and with a lid-proof double center inserter (double CPCA) with hydraulic or pneumatic actuation for Motor vehicles with dual-clutch transmissions created to a To enable load switching in the - due the connection of two pressed, open in the ground state Kupplun gene with a lid-tight double CPCA - the operating force is stored internally in the clutch module. So it will not be the Actuating force itself changed or derived, but the power flow is internally closed to a new definition storage and all other related changes to avoid in the housing. The inventive Double clutch with cover-fixed double CPCA concept and two pressed "normally open "couplings thus enables the actuating forces at the crankshaft to reduce to zero and a standalone Coupling module consisting of coupling and release system display.

The Double clutch could also be with two clutches closed and Deckelfestem Zentralausrücker be formed. Farther could the double clutch with a depressed and a drawn coupling in conjunction with a cover-resistant Central release be trained.

The Application of this concept of a double clutch with cover solid Double CPCA and two compressed "normally open" couplings has the further advantage that 'uses simple engagement bearing can, because with a pulled clutch (independently whether raised or closed) would be a manual one Locking the bearing on the plate spring or lever spring and thus a more elaborate special release bearing / engagement bearing necessary. An engagement bearing / release bearing a pulled clutch also requires a biasing spring to the contact between the release bearing and the diaphragm spring tongues sure.

The Application of the above-taught assembly concept of a double clutch with topping double CPCA and two pressed "normally open "couplings in conjunction with the simple engagement bearing the advantage of mounting that on a manual latch can be omitted, the pulled couplings (independently whether raised or closed) would be necessary. The manual locking would be a correspondingly more difficult Install / disassemble the gearbox to the engine block, for this then also still a mounting hole would have to be provided in the bell housing.

1

Dual clutch assembly

2

Double coupling

10

Central plate

11

flywheel

12

Bolted connections

13

Starter gear

20

clutch disc

21

Anpresswelle

22

tie rods

23

Bolted connections

23a

spacers

23b

screw

26

Bearing

30

clutch disc

31

Anpresswelle

31b

support area

32

clutch cover

34a

bending radii

34b

bending radii

35

bearing ring

36

lever spring

37

cover support

38a

recess

38b

circlip

40

actuator

41

engagement bearing

42

piston

43

cylinder

44

floor area

45

pressure chamber

46

guide sleeve

47

operation seat

48

piston

49

cylinder

50

pressure chamber

100

radial clearance

101

spring element

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

• EP 0185176 A1 [0002]

Claims (10)

Double clutch with two clutches, over the Input shafts of a dual-clutch transmission with an output shaft a drive unit are each connectable, and with an actuator, the one on a clutch cover one of the clutches arranged lid bearing is supported and wherein a Connection of the cover bearing in the clutch cover a radial clearance and means for generating a radial biasing force is provided, so that the cover bearing on the radial Biasing force is centered in conjunction with the radial clearance. Double clutch according to claim 1, wherein for each the clutches an actuator is provided, and both clutches in the unactuated state of the respective Actuator opened and each by Apply a compressive force can be closed. Double clutch according to claim 1 or 2, wherein the Actuator hydraulically or pneumatically actuated is. Double clutch according to one of the claims 1 to 3, wherein in a radially inner region of the cover bearing supporting clutch cover plate portions formed are, which in the assembled state of the double clutch in a transmission element, like disc spring or lever spring, trained breakthroughs pass through and which connected to a support element are supported on which a bearing outer ring of the cover bearing and is attached. Double clutch according to one of the claims 1 to 4, wherein the clutch cover in a stamping-stamping process or manufactured as a casting. Double clutch according to claim 4 or 5, wherein the Supporting a hub part and a connecting part comprising, wherein the hub part, the bearing outer ring of the cover bearing supported, and wherein the connecting part connected to the tab areas, especially riveted, welded, caulked or screwed on, is. Double clutch according to one of the claims 1 to 6, wherein each of the clutches is a transmission element rotating with the double clutch, as plate spring or lever spring, having, between each the transmission elements and the associated actuator an engagement bearing is arranged, which is for transmission is formed of compressive forces. Double clutch according to one of the claims 1 to 7, with a central plate, both clutches pressure plates have, which from different sides to the central plate can be pressed to the respectively belonging to the clutches clutch discs, preferably via a dry frictional contact, to clamp, and wherein the central plate via centering on a Flywheel is attached, which is connected to the crankshaft. Double clutch according to one of the claims 1 to 8, wherein a support of the cover bearing an axial Game, and wherein means for generating an axial Biasing force is provided so that the cover bearing over the axial preload force in conjunction with the axial play axial tolerances balances. Method for mounting a dual clutch in particular according to one of claims 1 to 9, wherein a pre-assembly consisting of two couplings, connected via the common Central plate, and from the cover firmly arranged actuator is assembled, being a one-piece or multi-part Flywheel connected to a drive shaft of a drive unit becomes, and wherein the central plate as part of this pre-assembly over Centering screws with the one-piece or multi-part flywheel is connected.