DE102018219406A1 - Torsional vibration damper with wet-running friction device and clutch disc with torsional vibration damper - Google Patents

Abstract

The invention relates to a torsional vibration damper (10) for a drive train of a motor vehicle. The torsional vibration damper (10) comprises an input part (12) and an output part (14) which can be rotated relative to the input part (10), the input part (12) and output part (14) being coupled to one another via at least one elastic element (16). A friction device (18) is also provided, which is arranged between the input part (12) and the output part (14). The at least one elastic element (16) is designed to run dry and the friction device (18) is designed to run wet. A clutch disc (100) for a motor vehicle is also provided, which has a corresponding torsional vibration damper (10).

Description

The invention relates to a torsional vibration damper for a motor vehicle with an input part, an output part, an elastic element and a friction device. The input part and output part are coupled via the elastic element and the friction device and can be rotated relative to one another. The invention further relates to a clutch disc with such a torsional vibration damper.

Torsional dampers or torsional vibration damper assemblies are used in various areas of machine and vehicle construction for the transmission of mechanical energy. For example, a torsional damper can be used in motor vehicle construction in the torque transmission path between the drive motor and the transmission. An internal combustion engine is used as the drive motor, which, due to its design and working principle, generates a rotary movement that includes rotational irregularities.

However, such rotational irregularities can be undesirable both in terms of driving comfort and in terms of mechanical loads on the components in the drive train. They can be perceived by occupants of such a vehicle in the form of an unwanted vibration or a disturbing noise. With regard to the functionality and service life of the motor vehicle, corresponding rotational irregularities can lead, for example, to mechanical loads which can reduce the service life of individual components.

Torsional vibration dampers are used to dampen rotational irregularities and to reduce their effects. These can temporarily store the energy stored in the rotational nonuniformities in the respective spring elements of the torsion damper and release them again out of phase with the rotary movement, which leads to the desired decoupling. The spring elements or energy storage elements are therefore located directly in the power flow of the drive train, for example between the motor and the transmission of the motor vehicle.

Known torsion dampers for vehicles have coulombic friction devices which are assigned to the spring elements and are designed to dampen resonances or resonance points in the drive train of the vehicle.

From the GB 1 602 408 A a torsional vibration damper for motor vehicle clutches with separate friction devices for an idling range and a load range is known. Both friction devices can be acted upon by the same spring.

From the EP 1 521 013 A dual mass flywheel is known in which a friction damping device has a first and a second friction plate device, the first friction plate device being connected to an input mass for rotation and the second friction plate device being connected to an output mass for rotation. An axially acting spring device is arranged to bring the friction plate devices axially into contact in order to produce friction damping.

A disadvantage of known torsional dampers can be that with frequent operation in the frequency range of the resonance of the spring elements, an increased load on the friction device or damping unit of the torsional vibration damper occurs. An associated higher friction work can lead to increased wear of the affected components and thus reduce the service life of such torsional vibration dampers. For example, some friction devices of known vibration dampers in modern drive trains cannot achieve a required, predetermined service life.

An object of the invention is to increase the service life of a torsional vibration damper with a friction device efficiently and inexpensively.

The object is achieved with devices according to the independent claims. Further aspects as well as further developments of the invention, which can bring about further advantages, are described in the dependent claims, the following description and in the figures.

Accordingly, a torsional vibration damper or torsion damper for an automobile is provided. The torsional vibration damper can be used in the drive train in a power transmission path between the engine and transmission. For example, the torsional vibration damper is formed in or on a clutch disc of a dry clutch of the motor vehicle.

The torsional vibration damper comprises an input part for receiving a torque, and an output part which can be rotated relative to the input part and via which the received torque can be output. The input part and the output part can each comprise at least one disk body, which are aligned coaxially on an axis of rotation.

The input part and the output part are coupled to one another via at least one elastic element. The elastic element can also be referred to as an energy store, since it can temporarily store and thus compensate for vibrations of the torque in order to dampen torsional vibrations. The elastic element can be formed, for example, by a spring, in particular a helical spring or helical compression spring. For example, several springs are provided for coupling the input part and the output part between them.

The torsional vibration damper also has a friction device which is arranged between the input part and the output part. The friction device is effective parallel to the elastic element. A first part of the friction device is connected in a rotationally fixed manner to the input part and a second part of the friction device is connected in a rotationally fixed manner to the output part, so that there is friction in the friction device when the input part and the output part rotate relative to one another. The friction device is designed, among other things, to reduce or avoid resonance peaks, which can occur during operation of the torsional vibration damper in the resonance region, at least in the region of a resonance frequency of a drive train by generating friction.

It is provided that the at least one elastic element is designed to run dry, whereas the friction device is designed to run wet. In other words, a fluid or a liquid is used for the friction device, which is provided exclusively within a predetermined area of the friction device. By contrast, there is no fluid in the area of the elastic element, for example the coil springs. For example, the coil springs are surrounded by air. The friction device can be designed such that an encapsulated area or a housing of the friction device is designed to be sealed with respect to a remaining area of the torsional vibration damper in order to prevent the fluid from escaping. In particular, such a torsional vibration damper can be formed on a dry-running clutch disc which has dry-running friction linings.

For example, the fluid provided for the wet-running friction device can comprise an oil or a fat. For example, the encapsulated area of the friction device is filled with oil and is made oil-tight with respect to the remaining area of the torsional vibration damper.

Due to the wet running design of the friction device, friction elements of the friction device can rub against one another in a space filled with grease or oil, whereby wear of the friction elements can be reduced compared to wear of a corresponding dry friction device. For example, grinding and thus abrasive wear on the friction elements can be reduced. Furthermore, the wet-running friction device can work in itself as a force-closed system, so that movements or constraining forces from the torsional vibration damper are not transmitted.

An alternative possibility in order to be able to achieve a required service life could be to provide a two-mass flywheel for torsion damping, the service life of which can be increased even with high demands due to a wet design of the entire two-mass flywheel. However, if the inside of the two-mass flywheel is completely filled with a liquid in order to reduce the wear of affected components, such a system has to be sealed completely in a complex and expensive manner so that the liquid cannot escape from the two-mass flywheel, which causes considerable demands on the space required. Furthermore, a large amount of liquid is required, which must be made available throughout the system.

The disadvantages of a completely wet-running system can be avoided with the solution provided. In contrast to completely wet-running systems, it is not necessary to design the entire torsional vibration damper to be sealed, as a result of which an effort for sealing can be reduced and consequently costs can be reduced. Advantageously, it is sufficient to form only the area of the friction device in a sealed or encapsulated manner. Furthermore, a required amount of fluid can be reduced in that the fluid is provided only in the limited surroundings of the friction device.

As already mentioned, it is possible for the wet-running friction device to be encapsulated in order to keep a fluid provided for the friction device within an encapsulated area. The encapsulation can have the effect that only friction elements of the friction device, in particular on their respective friction surfaces, are arranged in a wet environment or surrounded by fluid. In other words, the friction elements and fluid are arranged together in the encapsulated area.

For example, existing elements of the torsional vibration damper can be used in an efficient manner for a corresponding encapsulation. Accordingly, it is provided in one embodiment that a sealing of the encapsulated area of the wet-running Friction device in relation to a dry-running area of the torsional vibration damper is provided in the axial direction by the input part and / or the output part and in the radial direction at least partially by the friction device or a friction element carrier of the friction device. For example, the output part can be formed by two disk bodies which are axially connected to a radially inner friction element carrier. A radially outer friction element carrier, which can be assigned to the input part, can be arranged radially outside the inner friction element carrier such that there are only small gaps between the outer friction element carrier and the disk bodies of the output part, through which a fluid could escape from the friction device. In other words, the encapsulated area can be largely sealed off by elements that are already present, so that they can be used in two ways.

Sealing concepts are provided to seal the remaining gaps mentioned. Accordingly, in a development of the torsional vibration damper for radially sealing the encapsulated area of the friction device, in particular for sealing radially outwards, at least one sealing ring is provided between the input part and the output part. The sealing ring can be rotated relatively to at least one of the input part and the output part. For example, the sealing ring can be positioned in a groove of a carrier part which is assigned to the input part and connected to it in a rotationally fixed manner. The sealing ring can emerge axially from the groove in such a way that it bridges or closes the gap and is in contact with the output part, so that the encapsulated region of the friction device is sealed. When the input part moves relative to the output part, the sealing ring can slide along the output part. For example, the sealing ring can be lubricated or designed to be wear-resistant in order to provide a permanent seal e.g. to allow even with friction occurring in relation to the starting part. The sealing ring can be formed from an elastic material and can be provided, for example, by an O-ring. It can be an advantage that the encapsulated area can be sealed by using a simple and inexpensive component.

In a further embodiment, at least one plastic ring can be provided between the input part and the output part for the radial sealing of the encapsulated area of the friction device. The plastic ring is, for example, connected to the input part in a rotationally fixed manner and axially movable with respect to the input part. The plastic ring can be pressed onto the output part by means of an elastic pressure element and can be rotated relative to the output part. An axial width of the plastic ring is in particular wider than the above-mentioned remaining gap between the output part and the friction element carrier connected to the input part. An advantage of using the plastic ring in connection with the elastic pressure element can be that abrasion of the plastic ring on the side of the starting part can be compensated for by the elastic pressure element. If there are signs of abrasion on the plastic ring, this can be brought closer to the starting part by means of the elastic pressure element, so that a continuous seal can be provided despite abrasion. An advantage here can be an increased service life of the wet-running friction device.

It is e.g. possible to combine the described sealing concepts. The plastic ring can have a groove, for example, on an axial outside, which faces the exit part, in which the sealing ring can be introduced. In this way, a possible abrasion of the sealing ring can also be better compensated for and the sealing ring can be used for longer. Furthermore, exemplary embodiments are possible in which the plastic ring and / or sealing ring are arranged on the output part.

According to one embodiment of the torsional vibration damper, the friction device comprises at least one friction element that is non-rotatably connected to the input part and at least one friction element that is non-rotatably connected to the output part. The two friction elements are in contact with each other on friction surfaces that are directed towards one another, so that a frictional force is effective between the at least two friction elements. Due to the rotationally fixed connections, a frictional force can be generated between the output part and the input part. The friction device comprises, for example, a housing and two friction surfaces which, under spring preload, generate a frictional moment in the grease or oil-filled space, e.g. the encapsulated area of the friction device.

For example, the friction device has a friction element carrier which is designed to receive a plurality of friction elements. In particular, a radially outer friction element carrier and a radially inner friction element carrier are provided, each of which can accommodate a plurality of friction elements. Internal friction disks or plates can be provided on the radially outer friction element carrier, which are non-rotatably connected to the friction element carrier, but are axially movable within the friction element carrier. The inner friction element carrier can accordingly have external friction disks which have a common radial region with the friction disks of the outer friction element carrier and are arranged axially alternately with them. This can cause a Lamella arrangement of the friction elements can be achieved and a realizable friction torque or a friction effect of the friction device can be increased.

In order to bring about the frictional action between the friction elements assigned to the input part and the friction elements assigned to the output part, an elastic prestressing element can be provided which is designed to press the respective friction elements against one another. The elastic biasing element can be, for example, a plate spring corresponding to the shape of a friction element or a friction disc, which is arranged between two friction elements. This can advantageously ensure that contact of the friction elements is maintained even if abrasion of the friction elements occurs, since in the event of abrasion the elastic biasing element can expand axially in order to continue to press the friction elements against one another. As an alternative to a plate spring, the elastic prestressing element can also be formed by a compression spring, a corrugated spring or another, in particular annular element made of elastic material.

In particular, it is provided that the elastic prestressing element is only in contact with friction elements which are associated with the input part or exclusively with friction elements which are associated with the output part. In other words, the elastic prestressing element is thus arranged adjacent to two friction elements which are connected in a rotationally fixed manner to a common friction element carrier. A rotary relative movement between the elastic prestressing element and a friction element can thereby be avoided. The advantage can be to avoid abrasion of the elastic prestressing element, so that it can compensate for abrasion of the other friction elements for a longer time. Such an arrangement of the elastic prestressing element between two friction elements which are fixed in a rotationally fixed manner to one another is also possible in combination with a completely dry running torsional vibration damper with a dry friction device, for example in order to increase the service life of a dry torsional vibration damper.

For example, the torsional vibration damper can be provided on a clutch disc. Accordingly, the torsional vibration damper can have fastening means which make it possible to attach the torsional vibration damper to a clutch disc for a vehicle or to fasten it to the clutch disc. An attachment can be realized by means of screws, rivets, welding or other types of attachment.

Accordingly, the present invention also relates to a clutch disc for a motor vehicle, which has a torsional vibration damper according to a previously described torsional vibration damper. By using the torsional vibration damper with a wet friction device, the service life of the clutch disc can also be increased in an advantageous manner. It is particularly advantageous that the clutch disc can be designed to run dry due to the sealing of the wet-running friction device. In particular, dry-running friction linings are formed here. The friction linings absorb the torques introduced and serve as an input element or as part of the input element of the torsional vibration damper.

The clutch disc is advantageously designed as a dry-running clutch disc.

Further developments of the clutch disc relate to features of further developments as have already been described in connection with the torsional vibration damper. A repeated description of these features in combination with the clutch disc is therefore omitted at this point and the corresponding features are also considered to be disclosed in connection with the clutch disc.

• 1 ein Ausführungsbeispiel einer Kupplungsscheibe mit einem Torsionsschwingungsdämpfer in einer Querschnittansicht;
• 2a, 2b die Kupplungsscheibe in weiteren Schnittansichten;
• 2c eine Detailansicht einer Reibeinrichtung des Torsionsschwingungsdämpfers;
• 3 eine Detailansicht einer weiteren beispielhaften Reibeinrichtung;
• 4 eine beispielhafte Reibeinrichtung mit Tellerfeder;
• 5 eine perspektivische Ansicht eines Beispiels eines Torsionsschwingungsdämpfers mit Reibeinrichtung;
• 6a, 6b einen beispielhaften Reibelementträger mit Reibelementen;
• 7a, 7b Beispiele von Reibelementträgern in Einzelansicht;
• 8a-8c Beispiele von Reiblamellen und einer Tellerfeder;
• 9 ein Beispiel eines Kunststoffring zur Abdichtung; und
• 10 eine beispielhafte Mitnehmerscheibe.

Some examples of devices are only explained in more detail below with reference to the accompanying figures. Show it:

• 1 an embodiment of a clutch disc with a torsional vibration damper in a cross-sectional view;
• 2a , 2 B the clutch disc in further sectional views;
• 2c a detailed view of a friction device of the torsional vibration damper;
• 3rd a detailed view of another exemplary friction device;
• 4th an exemplary friction device with a plate spring;
• 5 a perspective view of an example of a torsional vibration damper with friction device;
• 6a , 6b an exemplary friction element carrier with friction elements;
• 7a , 7b Examples of friction element carriers in single view;
• 8a-8c Examples of friction plates and a disc spring;
• 9 an example of a plastic ring for sealing; and
• 10th an exemplary drive plate.

1 shows an embodiment of a clutch disc 100 with a torsional vibration damper 10th in cross section. The torsional vibration damper 10th has an input part 12th and an output part rotatable relative to this 14 on. Entrance part 12th and output part 14 are on a rotation axis A arranged. The entrance part 12th can friction linings 13 the clutch disc 100 be assigned. The exit part 14 is with a hub 15 non-rotatably connected. Entrance part 12th and output part 14 are about elastic elements 16 , for example helical compression springs 16 , connected. The helical compression springs 16 are in a window opening 17th arranged and surrounded for example by air. From the entrance part 12th can thus via helical compression springs 16 a torque to the hub 15 be transmitted.

The torsional vibration damper 10th also has a wet-running friction device 18th on that in an area radially inside the helical compression springs 16 is arranged (in 1 from a disc of the output part 14 covered). Details of the wet-running friction device 18th are shown in the following figures.

2a , 2 B show the clutch disc 100 in further sectional views. 2a shows a sectional view along the in 1 shown line aa . The entrance part 12th includes a drive plate 12a , the rotatably with a first friction element carrier 18a the friction device is connected. On the first friction element carrier 18a are friction elements 19th arranged with friction elements of a second friction element carrier 18b , the rotatable with the output part 14 connected, are in contact. The exit part 14 comprises a first disc body 14a and a second disc body 14b , the axially from two sides to the second friction element carrier 18b adjoin. 2 B shows a sectional view along the in 1 shown line bb . It is particularly clear that the disc body 14a , 14b of the output part 14 with the second friction element carrier 18b through several rivets distributed around the circumference 20th are non-rotatably connected. This creates a fluid-tight connection between the washer bodies 14a and 14b and the second friction element carrier 18b provided.

2c shows a detailed view of a friction device of the torsional vibration damper 10th of in 2a With X featured clipping. It can be seen that the first friction element carrier 18a assigned first friction elements 19a the friction elements 19th alternately with the second friction element carrier 18b assigned second friction elements 19b the friction elements 19th are arranged. For example, in a space between the first friction elements 19a and the second friction element carrier 18b a fluid of the wet-running friction device 18th provided, such as oil or fat. The friction elements are each connected in a rotationally fixed manner to their friction element carrier, but are axially movable relative to the latter. The friction elements 19th are by means of an elastic biasing element 22 that is arranged axially between friction elements, pressed against each other, so that a frictional contact between the friction elements 19th arises.

2c also shows a sealing concept with a plastic ring, for sealing the fluid-filled space of the friction device 18th . There is a first plastic ring 24a and a second plastic ring 24b radially outside of the first friction element carrier 18a arranged. The plastic rings are each by means of an elastic pressure element 25th , for example a disc spring, from the drive plate 12a against the disc body 14a , 14b pressed. This is an encapsulated area of the friction device 18th sealed radially outward so that the fluid of the wet friction device 18th not through a gap between the first friction element carrier 18a and the disc body 14a , 14b can leak.

3rd shows a detailed view of another exemplary friction device 18th , in which a sealing ring is used for the sealed encapsulation of the friction device. The first friction element carrier 18a is a carrier element 26 assigned that, for example, in one piece with the first friction element carrier 18a can be trained. The carrier element 26 points to one of the disc bodies 14a , 14b opposite side a groove in which a respective sealing ring 28a , 28b is arranged. The respective sealing ring is between the carrier element 26 and the respective disc body 14a , 14b pinched so that it seals the encapsulated area of the friction device 18th effected and yet rotatable relative to the disc body 14a , 14b and / or with respect to the carrier element 26 or the input part 12th is. The carrier element 26 has a recess in the radially inner region 26a on so that it is a drive plate 12a and the first friction element carrier 18a connecting weld seam can be arranged around. The connection between the drive plate 12a and the first friction element carrier 18a is designed to be fluid-tight, for example by a circular weld seam.

4th shows a schematic representation of an exemplary friction device 18th with disc spring, which acts as an elastic biasing element 22 respective friction elements 19a , 19b the friction device 18th pressed together. The friction elements 19a and 19b are opposite their respective friction element carriers 18a and 18b rotatably formed in the circumferential direction and movable in the axial direction. It can be seen that the plate spring 22 directly between two the second friction element carrier 18b assigned friction elements 19b is arranged. This creates between the plate spring 22 and the friction elements 19b no friction and wear of the disc spring 22 is avoided. Furthermore, between the friction elements 19a , 19b a fluid 30th in the encapsulated area of the friction device 18th provided.

5 shows a perspective view of an example of a torsional vibration damper 10th with friction device 18th . The friction element carrier 18a , 18b are toothed to accommodate toothed friction elements. Due to the teeth, the friction elements 19th are each connected to the friction element carrier in a rotationally fixed manner and, moreover, be designed to be axially movable relative to the latter. Radially between the first friction element carrier 18a and the second friction element carrier 18b is the encapsulated area of the friction device 18th to recognize in which the fluid 30th and friction elements 19th can be arranged.

6a , 6b show an exemplary friction element carrier 18a with friction elements in single view. The friction element carrier 18a has a carrier element 26 on to a sealing ring 28a record the axially from the friction element carrier 18a emerges. Especially in 6b is the alternating arrangement of first friction elements 19a and second friction elements 19b evident. External teeth of the first friction elements engage 19a in corresponding inner recesses of the toothed friction element carrier 18a a. Analogously, the friction elements 19b Internal teeth that are designed to fit into corresponding outer recesses of a toothed friction element carrier 18b intervene (not shown).

The 7a to 10th show individual elements of an exemplary torsional vibration damper for better understanding 10th or an exemplary friction device 18th . A combination of these elements can be used to create a torsional vibration damper 10th to provide.

7a shows a second friction element carrier 18b , which can be called a scar ring with external teeth. The second friction element carrier 18b has outer recesses 32 on, in the inner teeth of second friction elements 19b can intervene. Furthermore, the friction element carrier 18b Holes 31 on that to hold the rivet 20th are formed around the friction element carrier 18b with the disk bodies 14a , 14b connect to.

7b shows a first friction element carrier 18a , which can be described as an outer plate carrier and inner recesses 34 has, in which outer teeth of first friction elements 19a can be included. Furthermore, the first friction element carrier 18a also external recesses 36 in which, for example, inner teeth of a plastic disc 24a used to seal the friction device 18th can be used, so that the plastic disc 24a rotatably with the first friction element carrier 18a is connected, but is axially movable relative to this.

8a-8c show examples of friction plates and a plate spring for a friction device of a torsional vibration damper. A first friction element 19a or a friction plate 19a has an external toothing 35 on, which is formed in recesses 34 of the first friction element carrier 18a intervene. A second friction element 19b has a corresponding internal toothing 33 for inclusion in outer recesses 32 on. A disc spring 22 , also with an external toothing 35 provided, can be used as an elastic pretensioning element 22 are used, and for example between two to the plate spring 22 adjacent first friction elements 19a to be ordered.

9 shows an example of a plastic ring 24a for sealing an encapsulated friction device 18th . The plastic ring 24a has an internal toothing 37 on that in outer recesses 36 of the first friction element carrier 18a can intervene. The toothing and recesses shown in the figures are each form-fitting to one another. This makes it possible that, in particular, a radial contact area between the plastic ring 24a and the first friction element carrier 18a is sealed to prevent leakage of a fluid 30th to be able to prevent. 10th shows an exemplary drive plate 12a as an input part 12th or element of the input part 12th of a torsional vibration damper 10th . The drive plate 12a has window openings 17th on where elastic elements 16 can be arranged. Furthermore, is in a radially inner region of the drive plate 12a an internal toothing 38 formed, into which an external toothing of a first friction element carrier 18a can intervene to the first friction element carrier in a simple manner rotatably with the drive plate 12a to be able to connect.

According to the present invention, advantages of a wet friction device can thus be combined with advantages of a dry torsion damper. The wet friction device can be used as an encapsulated element within the torsion damper. This makes it possible, for example, to increase the service life of a torsional vibration damper in a cost-effective manner, without having to run the entire torsional vibration damper wet. Furthermore, special sealing concepts are provided in various embodiments of the invention.

Reference symbol list

10th

Torsional vibration damper

12

Entrance part

13

Friction lining

12a

Drive plate

14

Output part

14a, 14b

Disc body

15

hub

16

elastic element / helical compression spring

17th

Window opening

18th

Friction device

18a

first friction element carrier

18b

second friction element carrier

19, 19a, b

Friction elements

20th

rivet

22

elastic prestressing element / disc spring

24a, 24b

Plastic ring

25th

elastic pressure element / disc spring

26

Carrier element

26a

inner recess

28a, 28b

Sealing ring

30th

Fluid

31

drilling

32, 36

outer recesses

34

inner recesses

35

External teeth

33, 37, 38

Internal teeth

100

Clutch disc

A

Axis of rotation

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• GB 1602408 A [0006]
• EP 1521013 [0007]

Claims (10)

A torsional vibration damper (10) for a drive train of a motor vehicle, the torsional vibration damper (10) comprising: an input part (12) and an output part (14) rotatable relative to the input part (10), the input part (12) and output part (14) having at least one elastic element (16) are coupled to one another; and a friction device (18) arranged between the input part (12) and the output part (14), characterized in that the at least one elastic element (16) is designed to run dry and the friction device (18) is designed to run wet. Torsional vibration damper (10) according to Claim 1 , wherein the wet-running friction device (18) is encapsulated to hold a fluid (30) provided for the friction device (18) within an encapsulated area. Torsional vibration damper (10) according to Claim 2 A seal of the encapsulated area of the wet-running friction device (18) against a dry-running area of the torsional vibration damper (10) in the axial direction by the input part (12) or the output part (14) and in the radial direction at least partially by a friction element carrier (18a, 18b ) of the friction device (18) is provided. Torsional vibration damper (10) according to one of the Claims 2 or 3rd At least one sealing ring (28a, 28b) is provided between the input part (12) and the output part (14) for the radial sealing of the encapsulated area of the friction device (18), the sealing ring (28a, 28b) being connected to at least one of the input part ( 12) and output part (14) is relatively rotatable. Torsional vibration damper (10) according to one of the Claims 2 to 4th At least one plastic ring (24a, 24b) is provided between the input part (12) and the output part (14) for the radial sealing of the encapsulated area of the friction device (18), the plastic ring being connected in a rotationally fixed manner to the input part (12) and opposite the The input part (12) is axially movable, the plastic ring (24a, 24b) being pressed onto the output part (14) by means of an elastic pressure element (25) and being rotatable relative to the output part (14). Torsional vibration damper (10) according to one of the preceding claims, wherein the friction device (18) comprises at least one friction element (19a) connected in a rotationally fixed manner to the input part (12) and at least one friction element (19b) connected in a rotationally fixed manner to the output part (14), each of which facing friction surfaces are in contact, so that a frictional force between the at least two friction elements (19a, 19b) is effective. Torsional vibration damper (10) according to one of the preceding claims, wherein a friction element carrier (18a) of the friction device (18) is designed to receive a plurality of friction elements (19a). Torsional vibration damper (10) according to Claim 7 , wherein an elastic biasing element (22) of the friction device (18) is formed, respective friction elements (19a) assigned to the input part (12) or the output part (14) to respective friction elements assigned to the other of the input part (12) and output part (14) Press the friction elements (19b). Torsional vibration damper (10) according to Claim 8 , wherein the elastic biasing element (22) is only in contact with friction elements (19a) which are associated with the input part (12) or exclusively with friction elements (19b) which are associated with the output part (14), so that a rotational relative movement between the elastic biasing element (22) and a friction element (19) is avoided. A clutch disc (100) for a motor vehicle, the clutch disc (100) comprising: a torsional vibration damper (10) according to a torsional vibration damper (10) defined in one of the preceding claims.

Images