WO2011116745A1

WO2011116745A1 - Dual clutch

Info

Publication number: WO2011116745A1
Application number: PCT/DE2011/000256
Authority: WO
Inventors: Florian Krebs; Karl-Ludwig Kimmig; René Daikeler; Olaf Werner
Original assignee: Schaeffler Technologies Gmbh & Co. Kg
Priority date: 2010-03-25
Filing date: 2011-03-10
Publication date: 2011-09-29
Also published as: DE102011013479A1; CN103109101B; CN103109101A; DE112011101028B4; DE112011101028A5

Abstract

The invention relates to a dual clutch for coupling an input shaft on the engine side with an inner first output shaft on the transmission side and/or with an outer second output shaft arranged coaxially to the first output shaft, said dual clutch comprising a first clutch with a first pressure plate, which is axially movable relative to a first counter plate, for coupling a first clutch disc connected to a first output shaft. The dual clutch further has a second clutch with a second pressure plate, which is axially movable relative to a second counter plate, for coupling a second clutch disc connected to a second output shaft. The first and the second counter plates are connected to a clutch cover. Furthermore, an actuating device is provided for axially moving the first pressure plate and/or the second pressure plate. According to the invention, the first pressure plate is arranged in the axial direction between the first counter plate and the second counter plate, wherein a fixed bearing is directly connected to the first counter plate to be supported on the first output shaft. As a result, the dual clutch has a simple structure requiring little installation space, wherein additional usable installation space is created especially in the area of the clutch discs.

Description

Doppelkupplunq

The invention relates to a double clutch, by means of which a motor-side input shaft with two different transmission-side coaxially arranged output shafts can be coupled substantially traction interruption free.

From EP 1 850 025 A2 a double clutch is known with the aid of which an engine-side input shaft can be coupled to an inner transmission-side first output shaft and / or an outer transmission shaft arranged second output shaft coaxial with the first output shaft. The dual clutch has a first clutch and a second clutch, each having a relative to a respective counter-plate axially movable pressure plate for coupling a clutch disc connected to the respective output shaft. The respective counter plates are connected to a clutch cover. With the help of an actuator, the respective pressure plates can be moved. The counter plates of both clutches are integrally integrated in a common central plate, wherein the central plate between the two pressure plates of the two couplings extends radially inward and is radially supported on the inner output shaft.

There is a constant need that double couplings space saving and simple, especially in the field of clutch plates space to be created to equip the clutch plates with an additional torsional vibration damper, for example, a dual-mass flywheel.

It is the object of the invention to provide a double clutch, the space is saving and simple, in particular in the field of clutch discs additional usable space can be created.

The object is achieved by the features of claim 1. Preferred embodiments of the invention are specified in the dependent claims.

The double clutch according to the invention for coupling an engine-side input shaft with an inner gear-side first output shaft and / or an outer coaxial with the first output shaft arranged transmission-side second output shaft has a first clutch, which has a relative to a first counter-plate axially movable first Anpressplat- te for coupling a connected to the first output shaft first clutch disc has. Further, a second clutch is provided which has a second pressure plate axially movable relative to a second counter-plate for coupling a clutch disc connected to the second output shaft. With the first counter-plate and the second counter-plate, a clutch cover is connected. Furthermore, an actuating device for axially moving the first pressure plate and / or the second pressure plate is provided. According to the invention, the first pressure plate is arranged in the axial direction between the first counter-plate and the second counter-plate, with the first counter-plate a bearing for supporting the inner first output shaft is directly connected, and the inner first output shaft, in particular via a floating bearing, on the input shaft is radially supported.

The fact that the first pressure plate is arranged between the first counter-plate and the second counter-plate, the first counter-plate can be arranged at one axial end of the two clutches, so that the course of the first counter-plate does not extend radially inward substantially centrally of the two clutches but is displaced axially outward. As a result, usable space is created radially within the pressure plates, which is not consumed by the radial extent of the first counter-plate. This space can be used in particular to equip the respective clutch discs with a torsional vibration damper without these torsional vibration damper can collide with the radial extent of the first counter-plate. In particular, it is possible to bend the radial course of the first counter-plate from radially outward to radially inward in a motor-side axial direction, so that even usable space is created radially within the friction surface of the first counter-plate. In particular, only the first counterplate can be directly supported by the first counterplate and the second counterplate at the first output shaft via the fixed bearing. The support of the second counter-plate can thus take place exclusively indirectly via the first pressure plate, so that the extension of the second counter-plate can be carried out radially inwardly particularly low and is claimed by the second counter-plate correspondingly little space. By the fixed bearing axial displaceability of the first counter-plate can be avoided, so that it is possible that the actuator can support axially when moving the respective pressure plate on the first counter-plate. At the same time, it is possible to remove occurring weight forces and / or centrifugal forces of the first clutch and the second clutch via the fixed bearing to the first output shaft. In this case, the fixed bearing is directly connected to the first counterplate, that is, no separate additional components are provided between the first counterplate and the fixed bearing. chen fasteners would have to be connected to each other. Due to the motor-side support of the inner first output shaft, the forces introduced via the fixed bearing into the first output shaft can be partially diverted via the input shaft. Furthermore, high bending moments within the first output shaft can be avoided. With the help of the movable bearing, the first output shaft can be easily inserted into the input shaft. The inner first output shaft can in particular be mounted directly within the input shaft and supported on the input shaft or be supported exclusively by means of a bearing, in particular the floating bearing, within the input shaft and be supported on the input shaft. The dual clutch thereby has a space-saving and simplified construction, wherein in particular in the region of the clutch discs additional usable space is created.

The respective clutch disc can be rotatably connected via a toothing with the respective output shaft, but axially movably connected. The first counterplate and / or the second counterplate may protrude radially inward as a separate component from a radially outer housing wall. The first counterplate and the second counterplate may be releasably connected to the clutch cover. It is also possible that the first counter-plate or the second counter-plate of the clutch cover and / or a clutch cover axially opposite component, in particular in one piece. For example, one of the counter-plates may be formed by a flywheel connected to the engine-side input shaft and / or an output flange of a dual-mass flywheel connected to the input shaft. The clutch disc can have a friction lining, in particular on axially facing end faces pointing away from one another, in order to bring about frictional contact with both the counterplate and the pressure plate during coupling, wherein the respective counterplate and / or the respective pressure plate may or may not also have a friction lining. The respective pressure plates and counter plates are configured as separate, functionally separate components, so that a so-called "four-plate design" results for the dual clutch without significantly increasing the installation space Vibration damper, in particular two-mass flywheel and / or centrifugal pendulum and / or mass pendulum be connected directly or indirectly .Furthermore, the respective clutch disc may be damped.

In particular, with the actuating device, a support bearing, in particular a radial needle bearing, connected to the radial support on the second output shaft. This can the unit comprising the actuating device, the first clutch and the second clutch is radially supported via the motor-side fixed bearing on the first output shaft and via the transmission-side support bearing on the second output shaft. By means of the at least two support points spaced apart in the axial direction, correspondingly large forces can be removed without particularly high bending moments occurring in the components of the first clutch, the second clutch or the actuating device. At the same time, it is possible to remove the forces occurring not on a common component but over two different components. This avoids that either the first output shaft or the second output shaft must remove all occurring forces of the first clutch, the second clutch and / or the actuator. As a result, an unnecessarily high component load of the first output shaft and the second output shaft is avoided.

Preferably, a flywheel is provided, wherein the flywheel is formed integrally with the first counter-plate. The flywheel and the first counterplate can thereby form an integral unit, so that exactly one component for forming the flywheel and the first counterplate is sufficient. Since the flywheel is designed to be solid in order to provide a sufficiently inert mass, the flywheel can particularly easily remove the forces occurring in the first clutch and / or in the actuating device. Due to the radial extent of the first counter-plate to the first output shaft, the flywheel can thus be formed at the same time with a correspondingly selected thickness.

Particularly preferably, a torsional vibration damper connected to the first counterplate, in particular a dual mass flywheel, is provided, wherein the torsional vibration damper can be supported on the input shaft. The torsional vibration damper can in particular be screwed to the input shaft via a substantially rigid or flexible element. The forces applied by the torsional vibration damper, in particular in the radial direction, can thus be removed directly from the input shaft, so that it is not necessary to remove these forces via the first counterplate and the fixed bearing to the first output shaft. Particularly preferably, the fixed bearing connected to the first counter-plate is arranged in the axial direction such that the fixed bearing is arranged at least partially radially of the torsional vibration damper at the level of the torsional vibration damper. As a result, the installation space in the radial direction can be utilized in the region of the torsional vibration damper and installation space can be created radially within the pressure plates, which can be used elsewhere. In particular, the first counter-plate is connected to at least one motor-side protruding driver, wherein the driver is in particular designed such that a spline can be produced with a torsional vibration damper. About the driver, a stop can be formed, via which the torque of the input shaft can be introduced into the clutches of the double clutch. For assembly, it is only necessary to move a structural unit, in particular a torsional vibration damper, in the axial direction relative to the first counter-plate to the first counter-plate. This leads to a correspondingly easy to produce rotationally fixed connection, which leads to a simple to install easy to assemble the dual clutch. The driver only needs to be plugged into the corresponding component in order to form a spline. Particularly preferably, the driver can rest against a stop face, pointing in the circumferential direction, of an output flange of a dual-mass flywheel.

Preferably, the inner first output shaft is mounted directly within the input shaft and supported on the input shaft or exclusively via a bearing, in particular the floating bearing, mounted within the input shaft and supported on the input shaft. As a result, it is not necessary to provide bearing hub for receiving and supporting the inner first output shaft with the input shaft. Instead, the input shaft may have an end-side recess, in particular a blind bore, in order to support the inner first output shaft and to remove the occurring forces.

Particularly preferably, the actuating device is supported via a cover bearing radially outward on the clutch cover. This makes it possible to remove forces occurring during the actuation of the actuating device at least partially via the cover bearing and the clutch cover to the first counterplate. The forces occurring in the double clutch can thus be distributed more evenly and easily removed.

In particular, the actuating device has a first piston for axial movement of the first pressure plate by means of a first actuating pot and a second piston for axial movement of the second pressure plate by means of a second actuating pot, wherein the actuating travel of the first piston substantially the displacement of the first pressure plate corresponds and / or the actuating travel of the second piston substantially corresponds to the displacement of the second pressure plate. As a result, a directly actuated translation-free coupling is formed. A pivoting of the respective operating pot does not take place, so that the corresponding components for enabling a Verschwen- kens the respective operating pot can be saved. Assuming an ideally rigid actuating pot the actuating travel of the respective piston corresponds exactly to the displacement of the associated pressure plate. The displacement of the respective pressure plate thus differs from the actuating travel of the associated piston only by the distance in the axial direction by which the associated actuating pot is bent elastically upon actuation of the respective clutch.

Preferably, the actuating means comprises a first annular pressure cylinder for moving the first pressure plate and a second annular pressure cylinder for moving the second pressure plate, wherein the first pressure cylinder and the second pressure cylinder are arranged coaxially with each other. The coaxial arrangement of the ring-shaped pressure cylinder results in a particularly compact and space-saving design for the actuator. Due to the compact design of the actuating device, the actuating device has a comparatively low weight, so that the weight of the actuator can be removed without difficulty.

The invention further relates to a transmission train for a motor vehicle having an engine-side input shaft, a first transmission-side output shaft, a second transmission-side output shaft and a dual clutch for coupling the input shaft to the first output shaft and / or the second output shaft, wherein the first counter-plate supported on the first output shaft is. The dual clutch can be trained and developed as described above. Preferably, the first output shaft, in particular via a movable bearing, radially supported on the input shaft. The double clutch results in a space-saving and simple construction for the gear train, wherein in particular in the region of the clutch discs additional usable space is created.

The invention will be explained by way of example with reference to the accompanying drawing with reference to a preferred embodiment. It shows:

Fig. 1: a simplified schematic sectional view of a dual clutch.

The dual clutch 10 shown in FIG. 1 may couple a first input shaft 12 to an inner first output shaft 14 and / or an outer second output shaft 16 arranged coaxially with the first output shaft 14. For this purpose, the dual clutch 10 has a first clutch 18 and a second clutch 20. The first clutch 18 has a relative to a first counter-plate 22 axially movable axially movable pressure plate 24 in order to frictionally couple a first clutch disc 26 arranged between the first counter-plate 22 and the first pressure plate 24 via friction pads 28. The first clutch plate 26 may be rotatably connected via a toothing 30 but axially displaceable connected to the first output shaft 14. Accordingly, the second clutch 20 has a relative to a second counter-plate 32 axially displaceable second pressure plate 34 in order to frictionally couple a second clutch disc 36 arranged between the second counter-plate 32 and the second pressure plate 34 via friction pads 28. The second clutch disc 36 may be rotatably connected via a toothing 30 with the second output shaft 16 but axially displaceable. The first pressure plate 24 is arranged between the first counter-plate 22 and the second counter-plate 32, wherein the first counter-plate 22 and the second counter-plate 32 are configured as separate separate components.

The first counter-plate 22 and the second counter-plate 32 are connected to a clutch cover 38, which is connected via a cover bearing 40 with an actuator 42. The actuator 42 is rotatably carried and supported by a needle bearing 44 for the removal of radial forces on the second output shaft 16. The Betätigungsseinrichtüng 42 has an annular first pressure cylinder 46, by means of which a first piston 48 can be disengaged. The first piston 48 moves a first actuating pot 50 purely axially to move the first pressure plate 24 to close the first clutch 18 to the first counter-plate 22 to. Accordingly, the actuator 42 has a coaxial with the first annular pressure cylinder 46 arranged annular second pressure cylinder 52, by means of which a second piston 54 can be disengaged. The second piston 54 may move a second actuator pot 56 purely axially to move the second pressure plate 34 toward the second counterplate 32 to close the second clutch 20.

Furthermore, a flywheel 58 is provided, which is formed integrally with the first counter-plate 22. The first counter-plate 22 or the flywheel 58 is directly connected to a fixed bearing 60 and supported on the first output shaft 14. The fixed bearing 60 is axially fixed by means of a locking ring 62. Further, the flywheel 58 and the first counter-plate 22 may have an inwardly facing projection 64 to form a stop in the axial direction of the fixed bearing 60. But it is also possible that the bearing 60 has a pointing radially outward approach, which abuts against the flywheel 58 and on the first counter-plate 22. For improved removal of the abraded via the bearing 60 to the first output shaft 14 forces, the first output shaft 14 in addition via a movable bearing 66 within the input shaft radially supported. With the input shaft 12, a torsional vibration damper in the form of a dual mass flywheel 68 is further connected. The dual-mass flywheel 68 is screwed to the input shaft 12 via an input flange 70. Further, a starter ring 72 is connected to the input flange 70. The dual-mass flywheel 68 further has an output flange 74 arranged radially on the inside, which abuts a driver 76 connected to the flywheel 58 or the first counterplate 22, respectively, in order to transmit a rotational movement to the first counterplate 22. The driver 76 is substantially in the axial direction in the direction of the input shaft 12 from the first counter-plate 22 and the flywheel 58 and may for example be connected via a screw or riveting to the first counter-plate 22 and the flywheel 58. In the illustrated embodiment, the dual mass flywheel 68, a first bow spring 78. Due to the radially created within the first pressure plate 24 and second pressure plate 34 space 82, the first clutch plate 26 and / or the second clutch disc 36 may be additionally equipped with a torsional vibration damper, not shown.

Furthermore, second springs 80 are provided, which are part of a Verspanneinrichtung for the driving teeth to make the driving teeth between the ZMS output flange and driving ring play.

Reference character list double clutch

input shaft

first output shaft

second output shaft

first clutch

second clutch

first counter plate

first pressure plate

first clutch disc

friction lining

gearing

second counter plate

second pressure plate

second clutch disc

clutch cover

cover support

actuator

needle roller bearings

first impression cylinder

first piston

first actuating pot

second impression cylinder

second piston

second actuating pot

flywheel

fixed bearing

circlip

approach

movable bearing

Dual Mass Flywheel

inlet flange

starter wreath

output flange Driver first bow spring second springs installation space

Claims

claims

1. Double clutch for coupling an engine-side input shaft (12) having an inner gear-side first output shaft (14) and / or an outer coaxial with the first output shaft arranged transmission side second output shaft (16), with a first clutch (18) having a relative to a first counter-plate (22) has axially movable first pressure plate (24) for coupling a first clutch disc (26) connected to the first output shaft (14),

a second clutch (20) having a second pressure plate (34) axially movable relative to a second counterplate (32) for coupling a second clutch plate (36) connected to the second output shaft (16),

one with the first counter-plate (22) and the second counter-plate (32) connected to the clutch cover (38) and

an actuating device (42) for axially moving the first pressure plate (24) and / or the second pressure plate (34),

characterized in that

the first pressure plate (24) is arranged in the axial direction between the first counter-plate (22) and the second counter-plate (32), wherein with the first counter-plate (22) a fixed bearing (60) for support on the inner first output shaft (14) directly is connected, and the inner first output shaft (14), in particular via a movable bearing (66) on the input shaft (12) is radially supported.

2. Double clutch according to claim 1, characterized in that with the actuating device (42) a support bearing, in particular a radial needle bearing (44), for radial support on the second output shaft (16) is connected.

3. Double clutch according to claim 1 or 2, characterized in that a flywheel (58) is provided, wherein the flywheel (58) with the first counter-plate (22) is integrally formed.

4. Double clutch according to one of claims 1 to 3, characterized in that with the first counter-plate (22) connected torsional vibration damper, in particular a dual-mass flywheel (68) is provided, wherein the torsional vibration damper on the input shaft (12) can be supported.

5. Double clutch according to one of claims 1 to 4, characterized in that the first counter-plate (22) with at least one motor side axially projecting driver (76) is connected, wherein the driver (76) is in particular designed such that with a torsional vibration damper (68) a spline can be produced.

6. Double clutch according to one of claims 1 to 5, characterized in that inner first output shaft (14) mounted directly inside the input shaft (12) and supported on the input shaft (12) or exclusively via a bearing, in particular the floating bearing (66), stored within the input shaft (12) and supported on the input shaft (12).

7. Double clutch according to one of claims 1 to 6, characterized in that the actuating device (42) via a cover bearing (40) is supported radially outwardly on the clutch cover (38).

8. Double clutch according to one of claims 1 to 7, characterized in that the actuating device (42) has a first piston (48) for the axial movement of the first pressure plate (24) by means of a first actuating pot (50) and a second piston (54) axial movement of the second pressure plate (24) by means of a second Betätigungsstopfs (56), wherein the actuating travel of the first piston (48) substantially corresponds to the displacement of the first pressure plate (24) and / or the actuating travel of the second piston (54) in Substantially corresponds to the displacement of the second pressure plate (34).

9. Double clutch according to one of claims 1 to 8, characterized in that the actuating device (42) has a first annular pressure cylinder (46) for moving the first pressure plate (24) and a second annular pressure cylinder (52) for moving the second pressure plate (34). wherein the first pressure cylinder (46) and the second pressure cylinder (52) are arranged coaxially with one another.

10. gear train for a motor vehicle with an engine-side input shaft (12), an inner gear-side first output shaft (14), an outer coaxial with the first output shaft (14) arranged on the transmission side second output shaft (16) of a dual clutch (10) according to one of claims 1 to 9 for coupling the input shaft (12) to the first output shaft (14) and / or the second output shaft (16), wherein the first counter-plate (22) is supported on the first output shaft (14).