CN213145167U

CN213145167U - Clutch device

Info

Publication number: CN213145167U
Application number: CN202021717982.3U
Authority: CN
Inventors: 郑飞翔; 徐志力; 康嘉瑞
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2021-05-07
Anticipated expiration: 2030-08-17

Abstract

The utility model relates to a clutch device, which comprises a clutch or a first sub-clutch and a second sub-clutch, the clutch or each sub-clutch comprises a clutch plate group composed of an outer clutch plate and an inner clutch plate, the clutch is equipped with an adjusting piece used for pressing the corresponding adjacent clutch plate group along the axial direction, or the two sub-clutches are oppositely arranged along the axial direction and are arranged between the two sub-clutches and act on the adjusting piece used for selectively pressing the corresponding adjacent clutch plate group along the axial direction, or the two sub-clutches are oppositely arranged along the radial direction and are provided with the adjusting piece used for selectively pressing the clutch plate group along the axial direction, the adjusting piece is respectively coupled with the clutch plate group of the clutch or respectively with the clutch plate group of each sub-clutch through an axial bearing, the axial bearing is provided with at least one bearing ring centered at the adjusting piece or at the adjacent clutch plate of the corresponding clutch plate group or at the outer clutch plate bracket, the rolling bodies roll on the bearing ring.

Description

Clutch device

Technical Field

The present invention relates to a clutch device, comprising a clutch or a first and a second sub-clutch, wherein the clutch or each sub-clutch comprises a clutch disc set, which clutch disc set is composed of an outer clutch disc and an inner clutch disc engaging each other, the outer clutch disc is arranged on an outer clutch disc carrier in an axially displaceable manner, the inner clutch disc is arranged on an inner clutch disc carrier in an axially displaceable manner, wherein the clutch is equipped with an adjusting element for selectively pressing the respective adjacent clutch disc set in the axial direction, or two sub-clutches are arranged in an axially opposed manner and an adjusting element acting on both sides is arranged between the two sub-clutches for selectively pressing the respective adjacent clutch disc set in the axial direction.

Background

Such clutch devices are used in a known manner to temporarily establish a torque-transmitting force flow between a drive shaft of an internal combustion engine or electric motor and an output shaft leading to a transmission. This may involve a single clutch with only one clutch or only one clutch plate set or a double clutch. In the double clutch, separate partial clutches are provided, which can be actuated independently and are generally designated as the K1 clutch and the K2 clutch. The two partial clutches are used to distribute the torque introduced into the two independent output shafts and the two independent transmission inputs. Each of these sub-clutches typically includes an outer clutch plate carrier and an outer clutch plate axially movable thereon, an inner clutch plate carrier and an inner clutch plate axially movable thereon engaged between the outer clutch plates, and an adjustment member, i.e., an operating element, to axially press the respective clutch plate sets together. The outer clutch plate carrier is connected, for example, to a drive shaft, while the inner clutch plate carrier is connected to a driven shaft leading to the transmission. For this purpose, each clutch plate carrier has a radial flange which extends radially inward and is coupled to the respective shaft. An axial flange is connected to the radial flange, on which axial teeth are formed, in which likewise toothed clutch disks are guided so as to be displaceable in the axial direction. The clutch plate packs are pressed together to form a force-locking or friction-locking connection, so that a torque introduced from the drive shaft via the outer clutch plate carrier can be transmitted via the clutch plate packs to the inner clutch plate carrier and via the inner clutch plate carrier to the driven shaft to the transmission. For pressing the clutch disk pack, the adjusting element or the actuating element is moved axially, for which purpose a corresponding actuating mechanism is provided.

In such double clutches, axial arrangements are known in which two partial clutches are arranged axially one behind the other, wherein the actuating element, i.e. the actuating element, which presses the respective clutch plate set is arranged between the two partial clutches.

The two partial clutches and the adjusting element arranged between them are rotationally symmetrical annular assemblies, each having a center axis, wherein the partial clutches or the clutch disk carriers comprising the clutch disks rotate about the clutch center axis, while the annular adjusting element is fixed in position. The adjusting element itself is coupled to the respective partial clutch by means of an axial bearing, wherein the axial bearing is realized as a junction zone between a rotating part of the respective partial clutch, which is coupled to the adjusting element, and the fixed adjusting element.

SUMMERY OF THE UTILITY MODEL

The problem to be solved by the present invention is to provide a clutch device of as compact a construction as possible, which can be a single clutch, can be a double clutch.

In order to solve this problem, a clutch device is provided according to the invention, comprising a clutch or a first partial clutch and a second partial clutch, wherein the clutch or each partial clutch comprises a clutch disk pack consisting of an outer clutch disk and an inner clutch disk engaging into one another, the outer clutch disk being arranged axially displaceably on an outer clutch disk carrier and the inner clutch disk being arranged axially displaceably on an inner clutch disk carrier, wherein the clutch is equipped with an adjusting element for selectively pressing the respective adjacent clutch disk pack in the axial direction, or two partial clutches are arranged axially opposite one another and an adjusting element acting on both sides is arranged between the two partial clutches for selectively pressing the respective adjacent clutch disk pack in the axial direction, or two partial clutches are arranged radially opposite one another and each partial clutch is provided with an adjusting element for selectively pressing the clutch disk pack in the axial direction Wherein the adjusting element is coupled to the clutch disk pack of the clutch or to the clutch disk packs of the first partial clutch and the second partial clutch, respectively, by means of an axial bearing, wherein the axial bearing has at least one bearing ring which is centered on the adjusting element or on adjacent clutch disks of the respective clutch disk pack and on which the rolling elements roll.

In the clutch device according to the invention or more precisely the single clutch or the double clutch, the adjusting element or the moving element which is moved axially for pressing the clutch disk pack is coupled directly via an axial bearing to the adjacent clutch disks of the adjacent clutch disk pack. In other words, the adjusting element or actuating element, for example in the case of a dual clutch, is directly coupled to the axial bearing by the annular piston of the double-acting hydraulic slave cylinder forming the adjusting element, and the axial bearing is directly coupled to the adjacent clutch disk on the other side. A direct axial connection of the adjusting element to the clutch disk stack by the axial bearing is thus achieved, which on the one hand enables a very good introduction of force into the clutch disk stack, since this force is applied in the axial direction, rather than being initially conducted from the adjusting element via the pressure cup to the radially further outer partial clutch, as in the case of known clutch assemblies with actuating elements in the form of pressure cups. Furthermore, a very compact design is also achieved in both the single clutch and the dual clutch by the direct coupling or integration of the axial bearing between the adjusting element and the clutch disk pack.

A further advantage is, in particular, that the axial bearing with at least one bearing ring, by means of which the rolling elements, usually needles, roll on the bearing ring, is centered on the adjusting part or on the clutch disk. Thereby, the bearing ring can be brought into a defined centered position, in which the bearing ring is radially fixed. The bearing ring rotates together with the rolling elements when it is centered on the clutch disk or is fixed in position when it is centered on the adjusting element, i.e. for example the piston. During assembly, more precisely by arranging and centering the clutch parts in the transmission, the annular adjusting element can be offset from the center axis of the partial clutch. The direct integration of the axial bearing advantageously enables compensation of this axis deviation. Since the axial bearing is designed or integrated in such a way that the rotating part of the axial bearing can move radially relative to the stationary part, which can be part of the axial bearing or directly the adjusting part itself, a certain radial offset is possible. This enables the axis offset to be compensated for without any adversely acting radial forces acting on the radial bearing.

According to the invention, the axial bearing comprises at least one bearing ring, which has a corresponding raceway or rolling surface for the rolling elements, and which is centered at the adjusting element or at the adjacent clutch disc. If only one such bearing ring is provided, in a development of the invention, for good rolling contact of the rolling elements, a rolling surface for the rolling elements is likewise provided on the side opposite the bearing ring, i.e. if only one bearing ring is arranged at the adjusting element or at the clutch disk, a further rolling surface is provided at the clutch disk or at the adjusting element. The rolling bodies roll directly on the clutch disks or the adjusting elements.

Alternatively, it is also conceivable for each axial bearing to have a first bearing ring which is centered on the adjusting element, a second bearing ring which is centered on the adjacent clutch plate of the respective clutch plate pack, and rolling bodies which roll between the first bearing ring and the second bearing ring. In this embodiment, an approximately closed axial bearing is provided with two bearing rings, wherein the first bearing ring is centered on the adjusting part or its operating element and the second bearing ring is centered on the adjacent clutch plate. The rolling bodies, which are movable with the second bearing ring, can be moved radially relative to the first bearing ring, so that possible axial deviations can be compensated for thereby.

The adjusting means provided for the two partial clutches is particularly advantageously a double-acting slave cylinder which has axially movable annular pistons on both sides, wherein the first bearing ring is optionally centered on each piston. Such double-acting slave cylinders have two separate, annular cylinder chambers in which the respective annular pistons are guided so as to be axially movable. Each cylindrical annular chamber can be independently acted upon by hydraulic fluid, so that the respective pistons can be independently axially moved, so that adjacent clutch plate packs can be independently pressed together axially. In the case of only one axial bearing ring, which is centered on the adjacent clutch disk, the rolling elements and the cage assembly, i.e. the needle roller and the cage assembly, can roll directly on the respective piston. If only one bearing ring is provided, it can also be centered on the piston, so that the rolling elements roll on the bearing ring on this side, while the rolling elements roll directly on the clutch disk. If a first bearing ring and a second bearing ring are provided, the first bearing ring and the second bearing ring are centered on the piston and on the clutch disk and form a respective rolling element running surface.

In order to center the bearing rings arranged on the pistons, the respective piston is expediently provided with a circumferential centering collar, at which the respective bearing ring, if appropriate the first bearing ring, is centered. The centering collar can be, for example, an axially projecting circumferential collar, with the outer circumference of the bearing ring, for example a simple axial bearing disk, being centered at the inner circumference of the circumferential collar. However, it is also conceivable to use the inner circumference of the piston approximately as a centering collar, at which the bearing ring is centered by an axial centering collar. The piston can thus ultimately have any centering geometry which allows the bearing ring to be centered in the radial direction.

If one bearing ring, i.e. only this one bearing ring or the second bearing ring, is arranged on the clutch disk side, this bearing ring, if appropriate the second bearing ring, is centered on the clutch disk at the inner or outer periphery. Alternatively, it is also conceivable for the bearing ring to be centered on a circumferential centering flange or ring which is formed or arranged on the clutch plate. Finally, a third alternative is that the bearing ring is centered at the inner periphery of the outer clutch plate carrier. This also gives different geometric designs for the centering sections at the clutch plate itself or at the outer ring. If the centering is performed on the inner or outer circumference of the clutch plate, the respective bearing ring has a respective centering collar extending in the axial direction, by means of which the inner or outer circumference of the clutch plate is surrounded. If a corresponding centering collar is formed on the clutch plate, which can be easily implemented in terms of deformation technology, or if an additional centering ring is fastened to the clutch plate, the bearing ring is centered, for example, by its outer or inner periphery, on the centering collar or centering ring, respectively. If the centering is performed at the inner periphery of the outer clutch disk carrier, no special design is required for this purpose, since the outer clutch disk carrier extends axially over the clutch disk stack, so that a corresponding arrangement of the bearing ring centered by its outer periphery can be achieved.

Different cross-sectional geometries of the bearing rings are conceivable depending on where the bearing ring, if appropriate the first bearing ring or the second bearing ring, is centered. If appropriate, the first bearing ring or the second bearing ring can be a simple flat bearing disk, which is centered, for example, by its outer or inner circumference at the piston, the clutch disks or the outer clutch disk carrier. Alternatively, the bearing ring is a bearing disc having an axially extending centering or support point at the inner circumference and/or at the outer circumference and/or in the annular face. Here, a simple deformation element is also used as the bearing ring. The bearing disk is bent at least once and has at least one axially extending centering or support flange in addition to the radial section configured with the rolling surfaces. The centering collar serves for centering at the piston or the clutch plate or the like, which extends in the axial direction and is centered, for example, at the centering collar on the piston side or at the inner periphery of the outer clutch plate. If a support flange is provided, for example, a cage, in which the rolling bodies are held, can be supported on the support flange, while the bearing rings are correspondingly centered, for example, by their outer or inner periphery. It is possible to form the respective axially extending centering or support flange not only at the outer or inner periphery, but also, if a plurality of flanges, for example, centering and support flanges, are provided, if desired, in particular in the side faces.

In this case, it is conceivable to provide two centering or support flanges which project to different sides, in particular at a common radial height. In this variant, a flange projects toward each of the two sides of the radial portion. The flanges can be offset from one another in the radial direction or they can lie at a common radial height, wherein a T-shaped cross section is then obtained by the bearing ring or the bearing disk.

Drawings

The invention is elucidated below with reference to the drawings according to embodiments. The figures are schematic and show:

fig. 1 to 13 show different designs of a clutch device according to the invention in the form of a double clutch having axial bearings of different designs.

Detailed Description

Fig. 1 shows a clutch device 1 according to the invention, which comprises a first partial clutch 2 and a second partial clutch 3. Each

partial clutch

2, 3 has an outer

clutch plate carrier

4, 5, which comprises a substantially cylindrical

axial flange

6, 7 and a

radial flange

8, 9 formed at the end of the axial flange, wherein each radial flange is coupled to a respective input element 10, 11, welded thereto, through which a torque can be introduced into the clutch device 1.

An inner

clutch disk carrier

12, 13 is also arranged inside each

partial clutch

2, 3, wherein each inner

clutch disk carrier

12, 13 in turn has a substantially cylindrical

axial flange

14, 15 and a

radial flange

16, 17 formed at the end of the axial flange, which radial flange is connected via a

respective engagement connection

18, 19 to an output element, for example a transmission input shaft (not shown in detail).

The outer

clutch plate carriers

4, 5 and the inner

clutch plate carriers

12, 13 are plate members which are made by deforming using respective deforming tools.

The respective outer

clutch plates

20, 21 are guided on the

axial flanges

6, 7 of the outer

clutch plate carriers

4, 5 so as to be axially displaceable. The respective inner

clutch plates

22, 23 are guided axially movably on the

axial flanges

14, 15 of the inner

clutch plate carriers

12, 13, and engage between the outer

clutch plates

20, 21. The outer

clutch plates

20, 21 are, for example, steel plates, while the inner

clutch plates

22, 23 are friction plates. The outer

clutch plates

20, 21 and the inner

clutch plates

22, 23 form clutch plate packs 24, 25 for transmitting the torques introduced via the input elements 10, 11, respectively, from the outer

clutch plate carriers

4, 5 to the inner

clutch plate carriers

12, 13 and via the inner clutch plate carriers to the output element. For this purpose, the two clutch plate packs 24, 25 can be pressed together selectively in the axial direction and can be pressed onto

supports

26, 27 formed on the respective

radial flanges

8, 9 of the outer

clutch plates

4, 5. For this purpose, an adjusting element 28 in the form of a double-acting hydraulic slave cylinder 29 is used, which has two

annular pistons

30, 31, which are each provided with a respective annular cylinder chamber 32, 33 into which hydraulic fluid can be pressed in order to press the

pistons

30, 31 axially against the respective

clutch plate pack

24, 25. Each

piston

30, 31 is supported on the respective adjacent outer

clutch plate

20, 21 by means of an

axial bearing

34, 35, so that the respective outer

clutch plate

20, 21 or more precisely the

clutch plate pack

24, 25 can rotate relative to the stationary slave cylinder 29. This results in a purely axial configuration from the clutch disk packs 24, 25 via the

axial bearings

34, 35 to the

pistons

30, 31, which configuration enables an axial force flow for adjusting the clutch disk packs 24, 25.

Depending on whether the

pistons

30, 31 are moved axially and which clutch

disk pack

24, 25 is pressed together, the torque introduced via one of the input elements 10, 11 is further distributed via one of the partial clutches 2 or the other partial clutch 3. The principle design and operation of such clutch devices embodied as dual clutches are known.

In a first variant of the invention shown in fig. 1, each

axial bearing

34, 35 has needle-shaped rolling

bodies

36, 37, which are each guided in a

cage

38, 39. Each

axial bearing

34, 35 has only one

bearing ring

40, 41, which in the example shown is bent in a Z-shaped manner in cross section. The bearing rings have intermediate, radial disk sections 42, 43, to which support flanges 44, 45 extending to the respective

clutch disk pack

24, 25 are connected and at the inner circumference of which centering

flanges

46, 47 extending to the

pistons

30, 31 are connected, by means of which centering flanges the bearing rings 40, 41 are arranged centered at centering

flanges

48, 49 of the

respective pistons

30, 31, the centering

flanges

48, 49 being configured approximately at the inner circumference of the

pistons

30, 31. The

respective cage

38, 39 is supported or more precisely guided at the support flanges 44, 45.

In this variant, the rolling

bodies

36, 37 roll directly on the adjacent outer

clutch plates

20, 21, so that the outer clutch plates have or serve as corresponding rolling surfaces.

The embodiment according to fig. 2 is approximately identical to the embodiment according to fig. 1, only one half of the clutch device being shown here (likewise in the following figures), the other half being identically embodied in a mirror image. That is, only the sub-clutch 3 and its respective components are shown here. The same embodiment is also applicable to the sub-clutch 2.

In contrast to the embodiment according to fig. 1, the axial bearing 34 (and the axial bearing 35) here has a second bearing ring 50 which is supported directly on the outer clutch plates 20 and is centered, for example, radially on the inner circumference of the axial flange 6 of the outer clutch plate carrier 4. The bearing ring, i.e. the second bearing ring according to the nomenclature, thus forms a support member by means of which the axial bearing 34 is supported in its entirety on the clutch plate pack and has a corresponding rolling element running surface. The bearing ring 40, i.e. the first bearing ring according to the nomenclature, is arranged on the piston 30 and centered there in the same way as described in fig. 1.

Fig. 3 shows a design with only one (first) bearing ring 40, which here is L-shaped in cross section and has an axially extending centering flange 51 at its outer circumference, centering flange 51 being centered at an axially extending centering flange 52 of piston 30. The centering collar 51 at the same time serves as a support collar for the cage 38 of the axial bearing 34. In this embodiment, the rolling elements 36 roll directly on the clutch disks 20, similar to fig. 1.

In the embodiment according to fig. 4, a second bearing ring 50 is also provided, similar to the embodiment according to fig. 2, which is centered on the inner circumference of the axial flange 6 of the outer clutch plate 4 and is supported on the outer clutch plate 20 in the same manner as in the embodiment according to fig. 2. In this embodiment, the rolling elements 36 roll on the second bearing ring. The first bearing ring 40 corresponds to the embodiment according to fig. 3.

In the variant according to fig. 5, only one (first) bearing ring 40 is also provided, at the inner end of which a centering collar 46, which in the example shown points axially toward the piston, projects, the centering collar 46 in turn being centered at a centering collar 48 of the piston 30. The support flange 53 projects toward the opposite side, and the cage 38 of the axial bearing 34 is supported or guided on the support flange 53. In this embodiment, the rolling elements 36 again roll directly on the outer clutch disks 20.

Fig. 6 shows the same variant as fig. 5, with the addition of only a second bearing ring 50, which in turn is centered on the inner circumference of the axial flange 6 of the outer clutch plate carrier 4 and which bears directly against the clutch plates 20. The rolling bodies 36 of the axial bearing 34 also roll on the second bearing ring.

Fig. 7 again shows a variant with only one (first) bearing ring 40, which is L-shaped in cross section and by means of whose outer circumference the bearing ring 40 is centered at an axially projecting centering flange 52 of the piston 30. At the inner circumference of the bearing ring 40, an axially extending support flange 53 is formed, on which support flange 53 the cage 38 of the axial bearing 34 is in turn supported. The rolling elements 36 in turn roll directly on the outer clutch plates 20.

Fig. 8 again shows the variant according to fig. 7 with the addition of a second bearing ring 50, on which the second bearing ring 50 is also centered on the inner circumference of the axial collar 6 of the outer clutch plate 4 and the rolling elements 36 roll.

In the embodiment according to fig. 9, a second bearing ring 50 is provided, which second bearing ring 50 is centered on an axially extending centering flange 54 provided on the adjacent outer clutch plate 20. The bearing ring 50 has a support flange 55 projecting toward the piston, on which support flange 55 the cage 38 of the axial bearing 34 is supported.

Here too, a first bearing ring 40 in the form of a simple flat axial disk is provided, which is centered with its outer circumference on a centering collar 52 of the piston 30 and on which the rolling bodies 36 also roll.

Fig. 10 shows a further variant with a second bearing ring 50, the cross section of the second bearing ring 50 being C-shaped and having a centering collar 56 on the outer circumference of the second bearing ring 50, by means of which centering collar 56 the second bearing ring 50 is centered on the inner circumference of the axial flange 6 of the outer clutch plate carrier 4. At the inner periphery, a support flange 55 is provided, on which support flange 55 the cage 38 of the axial bearing 34 is in turn supported or guided.

A first bearing ring 40 in the form of a simple flat bearing disk is again arranged on the piston 30, which is centered on the piston-side centering flange 52.

FIG. 11 shows another variation with a second bearing ring 50, differing from FIG. 10 in that the second bearing ring 50 is here embodied "in cross-section and centered at an axially extending centering flange provided on the adjacent outer clutch plate 20 and located at the inner side of the adjacent outer clutch plate 20; and at the opposite inner side of the second bearing ring 50, a support flange is provided, on which the cage 38 of the axial bearing 34 is in turn supported or guided.

Fig. 12 shows a variant similar to fig. 10. The second bearing ring 50 is formed in an F-shaped cross section and has a centering collar 56 on the outer circumference, with which centering collar 56 the second bearing ring 50 is centered on the inner circumference of the axial flange 6 of the outer clutch plate carrier 4. An axially projecting support flange 55 is formed radially approximately inside the centering flange 56, and the cage 38 of the axial bearing 34 is supported or guided with its outer circumference on the support flange 55.

The first bearing ring 40 is again designed as a simple flat axial disk and is centered at the centering flange 52 of the piston 30.

Fig. 13 finally shows a variant with only a (first) bearing ring 40 in the form of a simple flat axial disk, which is centered with its outer circumference at the centering flange 52 of the piston 30.

The adjacent outer clutch plates 20 are formed in the region of their inner circumference with a correspondingly molded support collar 57 or are provided with a support ring, while the cage 38 of the axial bearing 34 is guided on the support collar 57 or the support ring. The rolling elements 36 roll on the first bearing ring 40 on the piston 30 on one side and directly on the outer clutch plate 20 on the other side.

List of reference numerals

1 Clutch device

2 first sub-clutch

3 second sub-clutch

4 outer clutch plate support

5 outer clutch plate support

6 axial flange

7 axial flange

8 radial flange

9 radial flange

10 input element

11 input element

12 inner clutch plate support

13 inner clutch plate support

14 axial flange

15 axial flange

16 radial flange

17 radial flange

18 engagement connection

19 engaging connection

20 outer clutch plate

21 outer clutch plate

22 inner clutch plate

23 inner clutch plate

24 clutch plate set

25 clutch plate set

26 support part

27 support part

28 adjustment member

29 slave cylinder

30 ring-shaped piston

31 annular piston

32-ring cylinder chamber

33 annular cylinder chamber

34 axial bearing

35 axial bearing

36 axial bearing

37 axial bearing

38 holder

39 holder

40 (first) race

41 (first) race

42 disc zone

43 disc zone

44 support flange

45 support flange

46 centering flange

47 centering flange

48 centering flange

49 centering flange

50 second bearing ring

51 centering flange

52 centering flange

53 support flange

54 centering flange

55 support flange

56 centering flange

57 support flange

Claims

1. A clutch device comprising a clutch or a first sub-clutch (2) and a second sub-clutch (3), wherein the clutch or each sub-clutch (2, 3) comprises a clutch plate pack (24, 25) consisting of an outer clutch plate (20, 21) and an inner clutch plate (22, 23) engaging into one another, which outer clutch plate is arranged axially displaceably on an outer clutch plate carrier (4, 5) and which inner clutch plate is arranged axially displaceably on an inner clutch plate carrier (12, 13), wherein the clutch is equipped with an adjusting element for selectively axially pressing the respective adjacent clutch plate pack, or the two sub-clutches (2, 3) are arranged axially opposite one another and are arranged between the two sub-clutches on both sides for selectively axially pressing the respective adjacent clutch plate pack (24, 3), 25) Or the two sub-clutches (2, 3) are arranged radially side by side and each sub-clutch is provided with an adjusting element (28) for selectively axially pressing the clutch plate pack (24, 25),

wherein the adjusting element (28) is coupled to the clutch disk set of the clutch or to the clutch disk sets (24, 25) of the first partial clutch and the second partial clutch by means of axial bearings (34, 35),

wherein the axial bearing (34, 35) has at least one bearing ring (40, 50) which is centered on the adjusting element (28) or on adjacent clutch disks of the respective clutch disk pack (24, 25) or on the outer clutch disk carrier and on which rolling bodies (36, 37) roll.

2. Clutch device according to claim 1, characterised in that only in the case of one bearing ring (40, 50) arranged at the adjusting element (28) or at the adjacent clutch disc, which bearing ring has one running surface for the rolling bodies (36, 37), is provided with another running surface for the rolling bodies (36, 37) at the adjacent clutch disc or at the adjusting element (28) itself.

3. A clutch device according to claim 1, characterised in that the axial bearing (34, 35) has a first bearing ring (40) centred at the adjuster (28), a second bearing ring (50) centred at an adjacent clutch plate of the respective clutch plate set (24, 25) and rolling bodies (36, 37) rolling between the first and second bearing rings.

4. A clutch device according to claim 3, characterised in that the adjustment means (28) with which the two sub-clutches (2, 3) are equipped is a double-acting slave cylinder with axially movable pistons (30, 31) on both sides, wherein the first bearing ring (40) is centred at each piston (30, 31).

5. A clutch device according to claim 4, characterised in that a circumferential centering flange (52) is provided at each piston (30, 31) on both sides, at which centering flange the first bearing ring (40) is centered.

6. A clutch device according to claim 3, characterised in that the second bearing ring is centred at the inner or outer periphery at the adjacent clutch plates, or at a surrounding centring flange (54) or centring ring constructed or arranged at the adjacent clutch plates, or at the inner periphery of the outer clutch plate carrier (4, 5).

7. A clutch device according to claim 5 or 6, characterised in that the first bearing ring or the second bearing ring is a flat bearing disc or a bearing disc with axially extending centring or support flanges (44, 45, 46, 47, 51, 53, 55, 56) at the inner periphery, and/or at the outer periphery, and/or in the annular face.

8. A clutch device according to claim 7, characterised in that in a common radial height, two centering or support flanges (46, 53) are provided which project towards different sides.

9. Clutch device according to one of claims 1 to 6, 8, characterised in that the rolling body is movable in radial direction relative to a rolling surface against which it bears.

10. The clutch device according to claim 7, characterized in that the rolling body is movable in a radial direction relative to a rolling surface against which the rolling body abuts.