WO2013174634A1

WO2013174634A1 - Wet dual clutch

Info

Publication number: WO2013174634A1
Application number: PCT/EP2013/059174
Authority: WO
Inventors: Elmar Lorenz
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2012-05-22
Filing date: 2013-05-02
Publication date: 2013-11-28
Also published as: CN104321553B; DE102013208074A1; CN104321553A; DE112013002655A5

Abstract

A wet dual clutch, having a wet region, having a rotating clutch housing which comprises a clutch cover and a clutch cage, and having at least two clutch systems which comprise in each case at least one clutch disk with a corresponding number of pressure plates, wherein a central web which can be connected in terms of rotational action to the clutch cage and which has an outer edge with an outer diameter is arranged between the two clutch systems.

Description

Wet double clutch

The present invention relates to a wet double clutch for switching a

Double gear, in particular a motor vehicle. Typically, such a dual clutch is used for torque transmission from an output shaft of a drive unit, in particular an internal combustion engine, to a transmission with two transmission input shafts. A prior art vibration damper consists of a disc with circular dampers adapted to damp out unwanted vibrations and torsional vibrations, thus decoupling the drive train from the drive unit.

Due to the increased ride comfort and the achievable lower fuel consumption with the help of a dual-clutch automatic transmission, the use of double clutches prevails. In particular, in order to reduce the energy consumption of modern machines, especially mobile internal combustion engines, they are low-speed, that is, operated at low speeds. However, disturbing vibrations occur due to the low rotational frequencies. At the same time the vehicles are built ever lighter and therefore have a lower vibration-damping mass. Therefore, more damping systems or vibration compensation systems are required, but usually require an increased space. Especially in motor vehicles of the small car class and Kleinstwagenklasse the space is particularly limited.

The present invention has for its object to provide a wet dual clutch, which takes a particularly small space to complete.

The object is solved by features of the independent claim. Advantageous developments are the subject of the dependent claims.

In the present invention, a wet dual clutch is described, which has the following components: a wet area, a rotating clutch housing, which comprises a clutch cover and a clutch basket, at least two clutch systems, each comprising at least one clutch disc with a corresponding number of pressure plates.

The wet double clutch is characterized in that a rotatably connectable with the clutch basket central web is arranged with an outer edge with an outer diameter between the two coupling systems. In this context, a rotationally effective connection means a connection by which a rotational movement of one component is transmitted to the other component, either with or without a relative rotational angle of the two components relative to one another. In this case, further components can be interposed in the rotationally effective connection, the connection thus takes place directly or indirectly between the components.

The wet area is filled with a liquid, preferably with a mineral oil, and mainly comprises the heat-loaded, that is, the friction-loaded fins, which can better dissipate the resulting heat. Depending on the embodiment, furthermore, the force transmission unit can be arranged in the wet area. The rotating clutch housing has the task to define the wet area and seal it against the dry area. Furthermore, it is the task of the rotating clutch housing to transmit the torque from the output shaft of the drive unit to the lamellae, for example the central web and the pressure plates. In some embodiments, the clutch housing also has the task of forming an abutment for the contact pressure and to transfer the force in solid add-on parts. The central web forms a pressure plate for the clutch discs, wherein the central web, in contrast to the pressure plates with one side is always frictionally connected to one of the two clutch systems. Thus, the central web forms upon engagement of the first coupling system, the innermost pressure plate of the first coupling system with, for example, the left surface and the innermost pressure plate of the second coupling system upon engagement of the second coupling system with, for example, the right side. The two clutch systems each form independent clutch systems consisting of at least one pressure plate, each with a corresponding clutch disc, so that a friction surface is formed, which generates a transmission of the torque of the output shaft and at the same time the radial extent is adapted to the available space. In a particularly preferred embodiment of the invention, the wet dual clutch also has a vibration damper with an input side and an output side, which is arranged in the wet area to the double clutch. The vibration damper has the task to dampen vibrations in the drive train and thus dampen not only noise but also torque load peaks. The arrangement of the vibration damper in the wet space of the double clutch, a variety of components can be saved. In order to allow damping of the vibrations, however, corresponding recesses must be provided for the functional parts, which are sufficiently spaced even during oscillation of the vibration damper, so that they are not affected by the vibration of the vibration damper. The arrangement of the vibration damper in the wet area, moreover, the oscillating mass is increased by the liquid, so that a lower mass part is required. The liquid also has a damping effect, so that the damper portion of the vibration damper can be performed reduced with the same damping effect. The property of a damper is to convert a mechanical vibration into a dampening fluid, preferably into heat energy by friction in the dampening fluid. Because a wet double clutch must already be designed to dissipate a large amount of heat, the vibration damper is already sufficiently cooled by the location in the wet area.

Further advantageous embodiments of the wet double clutch are specified in the subclaims.

The features listed individually in the claims can be combined with one another in any technologically meaningful manner and can be supplemented by explanatory facts from the description and details from the figures, wherein further embodiments of the invention are shown.

The invention and the technical environment will be explained in more detail with reference to FIGS. The figures show particularly preferred embodiments, to which the invention is not limited. In particular, it should be noted that the figures and in particular the illustrated proportions are only schematic. Show it:

Fig. 1: a double clutch in section with outside arranged vibration damper; Fig. 2: a double clutch in section with laterally arranged vibration damper;

Fig. 3: a double clutch in section with arranged in the clutch housing

vibration;

4 shows a motor vehicle with a transverse drive unit and a double clutch, for example, one of FIGS. 1 to 3.

Fig. 1 shows a double clutch 1 in section, in which the vibration damper 19 is disposed outside of the coupling housing 3 on an extension of the clutch cover 4 and resting on the clutch basket 5. The vibration damper 19 is composed of two springs or spring systems 22, 23 together. In the clutch housing 3 centrally a central web is arranged with an outer diameter 8 to the outer edge 7, which is axially fixed to a stop which is formed by the clutch basket 5. In this illustration, left to the central web 6, a first clutch system 9 is shown, which is composed of a clutch disc 1 1 and a pressure plate 15. In this illustration to the right of the central web 6, a second clutch system 10 is shown, which is composed of two clutch plates 13 and 14 and two pressure plates 17 and 18. The vibration damper 19 has an input side 20 and an output side 21. Furthermore, the Abtnebswellenanschluss 32 for an unillustrated output shaft 27 of a drive unit 26 (both not shown) can be seen in Fig. 1. In the region of the output shaft connection 32, a radial shaft sealing ring 33 is shown. Furthermore, a force transmission unit 34 can be seen, which presses against the driving ring 36 via a lever spring 35, which is mounted with the lever spring bearing 37. The lever spring bearing 37 is arranged on the driving teeth 38 of the clutch basket 5. Furthermore, an actuator 39 is shown for the engagement force, which is located in a fixed attachment 40. The first clutch system 9 is connected to a first transmission shaft 41 and the second clutch system 10 is arranged on a second transmission shaft 42, which are arranged concentrically in the center of the dual clutch 1.

Fig. 2 shows a similar arrangement as Fig. 1, wherein the vibration damper 19 is arranged laterally to the overall clutch system and is connected to the input side 20 with clutch cover 4 and is connected to the output side 21 to the clutch basket 5. The vibration damper 19 has an inner diameter 24 that is smaller than the outer diameter. ßendurchmesser 8 of the central web 6. In this example, the two coupling systems are 9,10 symmetrically constructed with respect to the friction surfaces and Reibflächenzahl and each consist of two clutch plates 1 1, 12 or 13, 14 and two pressure plates 15, 16 and 17, 18th Incidentally, reference is made to the description of FIG. 1.

Fig. 3 shows a similar arrangement as before in Figs. 1 and 2, in which case the vibration damper 19 is connected at the outer edge 7 with the input side 20. The output side 21 of the vibration damper 19 is connected to the clutch housing 3, in each case with the housing cover 4 and the clutch basket 5, which are almost completely symmetrical in this example. As in the example in FIG. 2, the two coupling systems 9, 10 are constructed symmetrically in the region of the friction surfaces and consist in each case of two clutch disks 1 1, 12 or 13, 14 and two pressure plates 15, 16 or 17, 18. Otherwise, referred to the previously described Figs. 1 and 2.

FIG. 4 shows a motor vehicle 25 with a double clutch 1, for example according to FIGS. 1 to 3. In front of the driver's cab 29, a drive unit 26 is arranged with the output shaft 27, via which the output unit 26 is connected to the double clutch 1, which in turn is connected to the purely schematically illustrated drive train 28 is connected. The drive unit 26 with the axis 31 is arranged transversely to the longitudinal axis 30 of the motor vehicle 25.

Fig. 5 shows a double clutch 1 with a central web 6, a first clutch system 9 and a second clutch system 10. The central web 6 and the two clutch systems 9, 10 are arranged in a clutch housing 3 with a driving device 43 and a clutch basket 5. The clutch housing 3 is fixedly connected to the output shaft terminal 32 and therefore rotates. About the driving teeth 38 of the central web 6 and the pressure plates 18 are taken and transmit the torque, starting from the output shaft connection 32 when the pressure plates 18 are pressed against the clutch plates 1 1 and 14 respectively. For example, the clutch disc 14 has a friction surface 44. Also, the first clutch disc 1 1 has on the left and right sides on a friction surface. The pressure plates 18 are pressed by the power transmission unit 45 with the driving ring 36. The power transmission unit 45 is driven on the input side by the actuating device 46, which is arranged in a fixed attachment 40, that is to say a non-rotating attachment. The power transmission unit 45 consists of The rotating portion 48 includes the driving ring 36, which is connected to the actuating finger 48 and optionally a lever spring 35. The lever spring of the second clutch system 10 is held on the driving teeth 38 in the lever spring counter bearing 37. The clutch basket 5 shown is bell-shaped or stepped and has a stop 49 for the central web 6, so that it is axially fixed. The driving teeth 38 is formed on the outer diameter 8 of the central web 6 and the pressure plates 18, so that they engage in the driving teeth 38. The first clutch disc 1 1 has a first diameter 50 and the second clutch disc 14 has a second diameter 51, which is smaller than the first diameter 50. The transmission of the contact pressure on the pressure plates 18 must be diverted into an attachment. For this purpose, the central web 6 is set up in the present case. The contact pressure transmitted by the pressure pot to the pressure plates 18 is absorbed by the central web 6 and transmitted via the centrally arranged rotating bearing 52 in the fixed attachment 40. The rotating bearing is disposed on a diameter 53 which is smaller than the innermost diameter 54 of the friction surfaces 44 of the clutch discs 1 1, 14. Furthermore, in Fig. 1, the first transmission shaft 41, which is connected to the first clutch system 9, and the second transmission shaft 42, which is connected to the second clutch system 10 shown. On the left side of the drive shaft connection 32, a radial shaft sealing ring 55 is shown. This is designed to seal the coupling system to the outside.

Reference numerals double clutch

wet areas

clutch housing

clutch cover

clutch basket

central web

outer edge

outer diameter

first coupling system

second coupling system

first clutch disc

second clutch disc

third clutch disc

fourth clutch disc

first pressure plate

second pressure plate

third pressure plate

fourth pressure plate

vibration

input side

output side

first spring

second spring

Inner diameter

motor vehicle

drive unit

output shaft

powertrain

cab

longitudinal axis

axis Output shaft connection Radial shaft seal Power transmission unit Lever spring

driver ring

Lever spring counter bearing Driving teeth Actuator

fixed attachment first transmission shaft second transmission shaft driving device friction surface

Power transmission unit actuator rigid portion rotating share stop

diameter

storage

diameter

Radial shaft seal

Claims

claims

Wet double clutch (1), comprising:

a wet area (2),

a rotating clutch housing (3) comprising a clutch cover (4) and a clutch basket (5),

at least two coupling systems (9,10), each at least one

Clutch disc (1 1, 12, 13, 14) with a corresponding number of pressure plates (15, 16, 17, 18),

characterized in that

a central web (6) connectable in rotation with the clutch basket (5) is arranged with an outer edge (7) with an outer diameter (8) between the two clutch systems.

Wet double clutch (1) according to claim 1, wherein the central web (6) forms a pressure plate for the clutch discs (1 1, 12, 13, 14).

Wet double clutch (1) according to one of claims 1 or 2, wherein the central web (6) with one side each frictionally with one of the two coupling systems (9,10) is connectable.

Wet double clutch (1) according to one of claims 1 to 3, wherein the central web (6) by a the toothing toothing (38) comprehensive component passes through radially.

A wet dual clutch (1) according to any one of the preceding claims, comprising a vibration damper (19) having an input side (20) and an output side (21).

Wet double clutch (1) according to claim 5, wherein the vibration damper (19) on the input side (20) with the central web (6) is connected and on the output side (21) is connected to the coupling housing (3).

Wet double clutch (1) according to one of claims 5 or 6, wherein the vibration damper (19) is arranged laterally to the central web (6), and in particular an inner diameter (24) which is smaller than the outer diameter (8) of the central web (6). i. Wet double clutch (1) according to one of claims 5 to 7, wherein the vibration damper (19) in the clutch housing (3) is arranged, and in particular from the clutch housing (3) is enclosed.