DE102012214022A1 - Torsional vibration damper i.e. disk damper, for use in clutch disk of starting clutch of motor vehicle, has output flange coupled with another output flange over friction disk, where disk has internal gear for coupling with input shaft - Google Patents

Abstract

The damper (12) has an input section (14) for introducing torque from a motor vehicle engine, and an output section (16) rotatable relative to the input section over an energy storage element (24) having an outer bow spring (26) and inner bow spring (28) and provided for diverting torque to a transmission input shaft of a motor vehicle transmission. The output section has an output flange (30) frictionally coupled with another output flange (32) over a friction disk (42). The friction disk has a friction disk internal gear (46) for torque-proof coupling with the transmission input shaft.

Description

The invention relates to a torsional vibration damper, in particular a disc damper of a clutch disc for a switched between a motor vehicle engine and a motor vehicle transmission friction clutch, with the aid of torsional vibrations damped, in particular to a transmission input shaft, can be transmitted.

Out EP 0 172 100 A1 is known a clutch disc with a disc damper, wherein the friction linings of the clutch disc are connected to an input flange. The input flange is fixedly connected to a cover plate, between which a multi-part output flange is arranged. The input flange with the cover plate is limited by bow springs rotatably coupled to the output flange. The output flange has an internal toothing, which is rotatably connected to an external toothing of a transmission input shaft in order to transmit the torque introduced via the input flange to the transmission input shaft. Between the internal toothing of the output flange and the outer toothing of the transmission input shaft a significant clearance is provided, so that adjusts a clearance angle between the output flange and the transmission input shaft in the circumferential direction. The multi-part output flange has a plurality of flange discs, between each of which is provided a spaced apart from the internal teeth of the output flange and the transmission input shaft friction disc.

There is a constant need to design the damping characteristic of a torsional vibration damper as comfortable as possible.

It is the object of the invention to provide measures that allows a comfortable damping characteristic of a torsional vibration damper.

The object is achieved by a torsional vibration damper with the features of claim 1. Preferred embodiments of the invention are set forth in the dependent claims, each of which individually or in combination may constitute an aspect of the invention.

According to the invention, a torsional vibration damper, in particular disc damper of a clutch disc for a switched between a motor vehicle engine and a motor vehicle transmission friction clutch, provided with an input part for introducing a torque, in particular from the motor vehicle engine, and a via an energy storage element, in particular at least one bow spring, rotatable relative to the input part output part for discharging the torque, in particular to a transmission input shaft of the motor vehicle transmission, wherein the output part has a vulnerable to the energy storage element first output flange and vulnerable to the energy storage element second output flange, wherein the first output flange via a friction disc with the second output flange is frictionally coupled, wherein the friction disc a Reibscheibeninnenverzahnung for rotationally fixed coupling with an output shaft, in particular the transmission input shaft of the motor vehicle transmission having.

By the friction disc, a frictional relative movement between the friction disc and the first output flange and / or the second output flange can be provided. The frictional relative movement alone makes it possible to dampen certain rotational irregularities, in particular high-frequency oscillations with low amplitude, and not or at least attenuated to transmit to the output shaft. In this case, this damping can take place independently of an attenuation achieved by the energy storage element, so that the torsional vibration damper can damp torsional vibrations with different frequencies. Additionally or alternatively, in particular during a load change, initially a frictional slippage occurs between the friction disk and the first output flange and / or the second output flange, so that only a portion of the torque is transmitted to the output shaft during the slip operation. In particular, in the slip mode, the transmission of the torque takes place substantially only via the friction disk or essentially only via the first output flange and / or the second output flange. After completion of the slip operation, the full torque introduced into the output part can be transmitted to the output shaft. As a result, torque surges on the output shaft are mitigated in a load change, so that there is a comfortable torque transmission. Since the friction disc can be decoupled by its internal toothing from the rotation of the first output flange and / or the second output flange at least in a partial area, a brief frictional slip operation can be provided, damped by the additional torsional vibration frequencies and / or a damped transmission of a speed change can be achieved , so that there is a comfortable damping characteristic for the torsional vibration damper.

The input part may in particular be provided with friction linings in order to form a damped clutch disc for a friction clutch. The energy storage element may in particular comprise a bow spring, wherein preferably two or more radially nested bow springs are provided to form the energy storage element. Preferably, a plurality of energy storage elements, for example, three, four, five or more energy storage elements, are provided, which are arranged distributed uniformly at least partially in the circumferential direction on a common radius. Two or more sets of energy storage elements may also be provided, wherein each set may have energy storage elements arranged on a common radius and the radius of the one set of energy storage elements deviates from the radius of the respective other set of energy storage elements. The energy storage elements strike in particular with its one axial end on the input part and with its other axial end to the output part. For example, the input part and / or the output part have a window in which the energy storage element is accommodated, so that upon relative rotation of the input part to the output part in one direction of rotation can strike the one side of the respective window to the energy storage element, while in a relative rotation of the Input part to the output part in one of a direction of rotation opposite to the other direction of rotation can strike the other side of each window to the energy storage element. The input part and / or the output part may overlap the energy storage element in the axial direction of the torsional vibration damper, so that the energy storage element between two components of the torsional vibration damper, which are formed in particular by the input part and / or the output part, is taken captive.

The first output flange and the second output flange may be rotatable relative to one another or may be coupled to one another such that they are screwed or riveted in the circumferential direction so as to be immovable. In particular, the output part has more than two output flanges and more than one friction disk. The friction torque in the slip mode can thereby be further increased. Further, it is possible to design the internal gears of the friction plates differently, so that an additional stepped course of the transmitted torque can be damped during a load change and / or additional rotational irregularity frequencies. Furthermore, different coefficients of friction can be provided for different friction disks. Additionally or alternatively, different coefficients of friction may be provided in a single friction disc, so that on the other hand different frictional forces can be established between the friction disc and the first output flange on the one hand and the friction washer and the second output flange on the other hand. In particular, the friction disc may be made substantially in one piece from a material which provides a material pairing with a desired frictional action between the friction disc and the first output flange and / or the second output flange. Further, it is possible for the friction disc in several pieces, for example, with a hard core, which is provided on its axial sides with friction linings to design.

In particular, the friction disc is rotatable both relative to the first output flange and relative to the second output flange. As a result, both axial sides of the friction disc can be used to transmit a correspondingly high friction torque as a result of the attacking friction forces in the slip mode.

Preferably, the first output flange and / or the second output flange has an internal flange toothing for non-rotatable coupling with the output shaft, wherein the flange inner toothing is formed differently from the friction disk inner toothing. It can thereby be achieved that during a relative rotation of the input part to the output part, the friction disk inner teeth abuts in front of the flange inner teeth or vice versa and thereby a relative movement of the friction disk to the first output flange and / or to the second output flange takes place with a frictional slip.

Particularly preferably, the flange inner toothing has an effective tooth width or tooth spacing φ _F in the circumferential direction for coupling to the output shaft and the friction disk inner tooth width or tooth spacing φ _R effective in the circumferential direction for coupling with the output shaft, where φ _F ≠ φ _R , in particular 0.01 ° ≤ | φ _F - φ _R | ≤ 3.0 °, preferably 0.05 ° ≤ | φ _F - φ _R | ≤ 2.0 °, more preferably 0.10 ° ≤ | φ _F - φ _R | ≤ 1.0 °, and more preferably 0.25 ° ≤ | φ _F - φ _R | ≤ 0.5 ° applies. Preferably, φ _F > φ _R. In order to achieve a relative movement of the friction disc to the first output flange and / or the second output flange during a relative rotation of the input part to the output part for a short time, the friction disk inner toothing or the flange inner toothing or in particular both the friction disk inner toothing and the flange inner toothing can have a clearance angle relative to the output shaft and / or relative to provide a hub rotatably connected to the output shaft. Due to the clearance angle, a relative rotation without torque transmission is possible in a limited by the clearance angle angle range. If the output shaft or the hub has a radially outwardly projecting tooth, which protrudes with play in a tooth spacing of the flange inner teeth and / or the Reibscheibeninnenverzahnung, φ _F and φ _R by the tooth spacing of the Flanschinnenverzahnung and Friction disc internal toothing defined. If the output shaft or the hub has a radially inwardly projecting interdental space into which a tooth of the flange inner toothing and / or the friction disk inner toothing projects, φ _F and φ _{R are} defined by the tooth width of the flange inner toothing and the friction disk inner toothing. By the amount of the difference of φ _F and φ _R , the angular range is defined in which a slip between the friction disc and the first output flange and / or the second output flange can take place. Additionally or alternatively, with a maximum possible angle of rotation φ _max between the input part and the output part, 0.01 ≤ φ _F -φ _R / φ _max ≤ 0.7, in particular 0.05 ≤ φ _F -φ _R | / φ _max ≤ 0.5, preferably 0.10 ≤ | φ _F - φ _R | / φ _max ≤ 0.4 and more preferably 0.20 ≤ | φ _F - φ _R | / φ _max ≤ 0.3.

In particular, the first output flange and the second output flange are identical, in particular identical, designed. The first output flange and the second output flange can be designed, for example, mirror-inverted. Preferably, the first output flange and the second output flange are designed as substantially identical identical parts, between which must not be differentiated during assembly of the torsional vibration damper. The assembly of the torsional vibration damper is thereby simplified and cheaper to manufacture.

Preferably, a hub is provided for rotationally fixed connection to the output shaft, wherein the hub has an engaging in the friction disk inner teeth hub outer teeth. Through the hub, the output flanges and the friction disc can be supported radially inward. Furthermore, it is sufficient in the assembly of the torsional vibration damper with the output shaft, in particular a transmission input shaft of a motor vehicle transmission, only thread the hub of the torsional vibration damper on the output shaft and rotatably connect. In particular, it is possible to provide further damping between the hub and the output shaft in order to achieve an even more comfortable damping characteristic.

Particularly preferably, a clearance angle α of 0.1 ° ≦ α ≦ 5.0 °, in particular 0.3 ° ≦ α ≦ 3.0 °, preferably 0.5 ° ≦ α ≦ 2, between the hub outer teeth and the friction disk inner teeth in the circumferential direction, 0 ° and particularly preferably 1.0 ° ≤ α ≤ 1.5 ° provided. Alternatively, if the Reibscheibeninnenverzahnung should not be connected via the hub but directly to the output shaft, the clearance angle α between the Reibscheibeninnenverzahnung and a toothing of the output shaft can be provided. By this clearance angle rotational irregularities are not transmitted to the hub or to the output shaft with a correspondingly small amplitude and thereby filtered out to achieve a more comfortable damping characteristic.

In particular, a spring element supported on the input part, in particular a disk spring, is provided for applying a normal force between the friction disk and the first output flange and / or the second output flange. About the configuration of the spring element, in particular with respect to the spring travel and the spring force, the friction force and thus the friction torque can be adjusted via the height of the normal force. The damping effect of the torsional vibration damper in the slip operation of the friction disc can be easily adjusted. In particular, it may be sufficient in the torsional vibration damper to replace only the spring element by a spring element with a different spring characteristic, in particular a different spring constant, in order to adapt the torsional vibration damper for different damper characteristics. The spring element presses in particular with a significantly higher spring force against the first output flange and / or the second output flange than would be necessary for a pure axial clearance compensation. If appropriate, the spring element can compensate for an axial misalignment of the first output flange and / or of the second output flange relative to the friction disk in the case of friction-related wear, in particular of the friction disk.

Preferably, the input part has an input flange connected to a cover disk, wherein the output part is arranged between the input flange and the cover disk. The input flange may in particular be provided with friction linings to form a damped clutch disc for a friction clutch. For this purpose, the input flange can extend further radially outward than the cover disk. The cover plate may in particular non-rotatably, for example by screwing or riveting, be connected to the input flange. The input flange and the cover plate can act more off-center on the energy storage element than the output flanges of the output part. The input flange and the cover plate may extend radially inward to the output shaft and / or to the hub, so that in particular radially inside the energy storage element, an interior can be limited, in which the friction disc, preferably substantially radially inwardly radially to the energy storage element, can be arranged. The friction disc can thereby be protected from contamination, so that the friction characteristic of the friction disc remains substantially constant over the life.

The invention further relates to a clutch disc for a switched between an automotive engine and a motor vehicle transmission friction clutch, with a torsional vibration damper, which may be as described above and further developed. Since the friction disc can be decoupled by its internal toothing from the rotation of the first output flange and / or the second output flange at least in a partial area, a brief frictional slip operation can be provided, damped by the additional torsional vibration frequencies and / or a damped transmission of a speed change can be achieved , so that there is a comfortable damping characteristic for the clutch disc.

The invention further relates to a friction clutch, in particular for coupling a drive shaft of an automotive engine with at least one transmission input shaft of a motor vehicle transmission with a clutch disc, which can be trained and further developed as described above. Since the friction disc can be decoupled by its internal toothing from the rotation of the first output flange and / or the second output flange at least in a partial area, a brief frictional slip operation can be provided, damped by the additional torsional vibration frequencies and / or a damped transmission of a speed change can be achieved , so that there is a comfortable damping characteristic for the friction clutch.

The invention further relates to a drive train with a drive shaft of an automotive engine, at least one transmission input shaft of a motor vehicle transmission and a friction clutch, which may be as described above and further educated, for coupling the drive shaft with the at least one transmission input shaft, wherein the output part of the torsional vibration damper for transmitting a Torque is rotatably connected to the transmission input shaft. Since the friction disc can be decoupled by its internal toothing from the rotation of the first output flange and / or the second output flange at least in a partial area, a brief frictional slip operation can be provided, damped by the additional torsional vibration frequencies and / or a damped transmission of a speed change can be achieved , so that there is a comfortable damping characteristic for the drive train.

The invention will now be described by way of example with reference to the accompanying drawings with reference to preferred embodiments, wherein the features shown below, both individually and in combination may represent an aspect of the invention. Show it:

1 : A schematic sectional view of a clutch disc with a torsional vibration damper,

2 : A schematic perspective view of an output flange of the rotary vibration damper 1 and

3 : A schematic plan view of a friction disc of the torsional vibration damper 1 ,

In the 1 illustrated clutch disc 10 for a friction clutch, in particular starting clutch of a motor vehicle, has a torsional vibration damper 12 with an entrance part 14 and an output part 16 on. The entrance part 14 has an input flange 18 and one with the input flange 18 rotatably connected cover plate 20 on. With the input flange 18 are friction linings 22 connected to the closed friction clutch, in particular coming from a drive shaft of a motor vehicle engine torque via the input part 14 in the torsional vibration damper 12 to be able to initiate. For torsional vibration damping is the input part 14 via an energy storage element 24 limited rotatable with the output part 16 coupled. In the illustrated embodiment, the energy storage element 24 an outer bow spring 26 and a radially inward of the outer bow spring 26 arranged inner bow spring 28 on. About the energy storage element 24 can that be from the entrance section 14 introduced torque attenuated to that between the input flange 18 and the cover disk 20 arranged starting part 16 be transmitted. The starting part 16 has a first output flange 30 and a second output flange 32 on, each via a Flanschinnenverzahnung 34 with a hub external toothing 36 a hub 38 rotatably coupled. The hub 38 can have a hub internal toothing 40 with an output shaft, in particular a transmission input shaft of a motor vehicle transmission, are connected.

Between the first output flange 30 and the second output flange 32 is a friction disk 42 provided with both the first output flange 30 as well as with the second output flange 32 is in frictional contact. A sufficient normal force for a sufficiently high frictional force can be achieved by a designed as a plate spring spring element 44 be applied to the cover disk 44 supported and over the second output flange 32 and the friction disc 42 against the first output flange 30 press, which simultaneously eliminates axial play. The friction 42 is about a Reibscheibeninnenverzahnung 46 also with the hub outer teeth 36 the hub 38 coupled, wherein the Reibscheibeninnenverzahnung 46 with the hub outer teeth 36 a different game in the circumferential direction (clearance angle) forms as the Flanschinnenverzahnung 34 with the hub outer teeth 36 , As a result, with rotational irregularities and / or load changes, a slipping relative movement of the friction disc 42 relative to the first output flange 30 and the second output flange 32 be achieved, which leads to a comfortable damping characteristic for the torsional vibration damper 12 leads.

For this purpose, the Flanschinnenverzahnung 34 of in 2 illustrated output flange 30 . 32 a tooth spacing φ _F , which in comparison to a tooth spacing φ _{R of} the friction disk internal toothing 46 the in 3 shown friction disc 42 is larger. At one to the output part 16 forwarded rotational irregularity with a correspondingly high amplitude or a sudden load change, in particular an increasing or decreasing speed, both the output flanges can first 30 . 32 as well as the friction disc 42 a certain clearance angle relative to the hub 38 paint over without transmitting torque. Subsequently, the friction disc 42 on the hub outer teeth 36 the hub 38 strike while the output flanges 30 . 32 by an additional angular range φ _F - φ _R relative to the hub 38 can be twisted. Between the output flanges 30 . 32 and the friction disc 42 occurs a frictional slip, so that between the output flanges 30 . 32 and the friction disc 42 a friction torque can be transmitted by the friction disc 42 to the hub 38 is transmitted. In a further relative rotation hit the output flanges 30 . 32 also on the hub outer teeth 36 the hub 38 on, whereby a relative rotation of the output flanges 30 . 32 to the friction disk 42 stops and the slip operation is ended. The full to the output part 16 transmitted torque can then with the help of the output flanges 30 . 32 and optionally partly over the friction disc 42 to the hub 38 be transmitted. For that at the hub 38 incoming torque results in a stepped course.

LIST OF REFERENCE NUMBERS

10

 clutch disc

12

 torsional vibration dampers

14

 introductory

16

 output portion

18

 inlet flange

20

 cover disc

22

 friction lining

24

 Energy storage element

26

 outer bow spring

28

 inner bow spring

30

 first output flange

32

 second output flange

34

 Flanschinnenverzahnung

36

 Hub outer teeth

38

 hub

40

 Internal gear hub

42

 friction

44

 spring element

46

 Reibscheibeninnenverzahnung

φ _F

 Tooth spacing output flange

φ _R

 Tooth spacing friction disc

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely 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.

Cited patent literature

• EP 0172100 A1 [0002]

Claims (10)

Torsional vibration damper, in particular disc damper of a clutch disc ( 10 ) for a friction clutch connected between a motor vehicle engine and a motor vehicle transmission, with an input part ( 14 ) for introducing a torque, in particular from the motor vehicle engine, and an energy storage element ( 24 ), in particular at least one bow spring ( 26 . 28 ), relative to the input part ( 14 ) rotatable output part ( 16 ) for discharging the torque, in particular to a transmission input shaft of the motor vehicle transmission, wherein the output part ( 16 ) one at the energy storage element ( 24 ) vulnerable first output flange ( 30 ) and one on the energy storage element ( 24 ) vulnerable second output flange ( 32 ), wherein the first output flange ( 30 ) via a friction disk ( 42 ) with the second output flange ( 32 ) is frictionally coupled, wherein the friction disc ( 42 ) a Reibscheibeninnenverzahnung ( 46 ) for non-rotatable coupling with an output shaft, in particular the transmission input shaft of the motor vehicle transmission having. Torsional vibration damper according to claim 1, characterized in that the friction disc ( 42 ) both relative to the first output flange ( 30 ) as well as relative to the second output flange ( 32 ) is rotatable. Torsional vibration damper according to claim 1 or 2, characterized in that the first output flange ( 30 ) and / or the second output flange ( 32 ) a flange internal toothing ( 34 ) for non-rotatable coupling with the output shaft, wherein the internal flange toothing ( 34 ) different from the friction disk internal teeth ( 46 ) is formed. Torsional vibration damper according to claim 3, characterized in that the Flanschinnenverzahnung ( 34 ) an effective in the circumferential direction for coupling with the output shaft tooth width or tooth spacing φ _F and the Reibscheibeninnenverzahnung ( 46 ) has an effective in the circumferential direction for coupling with the output shaft tooth width or tooth spacing φ _R , where φ _F ≠ φ _R , in particular 0.01 ° ≤ | φ _F - φ _R | ≤ 3.0 °, preferably 0.05 ° ≤ | φ _F - φ _R | ≤ 2.0 °, more preferably 0.10 ° ≤ | φ _F - φ _R | ≤ 1.0 °, and more preferably 0.25 ° ≤ | φ _F - φ _R | ≤ 0.5 ° applies. Torsional vibration damper according to one of claims 1 to 4, characterized in that the first output flange ( 30 ) and the second output flange ( 32 ) are similar, in particular identical, designed. Torsional vibration damper according to one of claims 1 to 5, characterized in that a hub ( 38 ) is provided for rotationally fixed connection to the output shaft, wherein the hub ( 38 ) one in the Reibscheibeninnenverzahnung ( 42 ) engaging external hub teeth ( 36 ) having. Torsional vibration damper according to claim 6, characterized in that between the hub outer teeth ( 36 ) and the Reibscheibeninnenverzahnung ( 42 ) in the circumferential direction, a clearance angle α of 0.1 ° ≤ α ≤ 5.0 °, in particular 0.3 ° ≤ α ≤ 3.0 °, preferably 0.5 ° ≤ α ≤ 2.0 °, and particularly preferably 1.0 ° ≤ α ≤ 1.5 ° is provided. Torsional vibration damper according to one of claims 1 to 7, characterized in that a at the input part ( 14 ) supported spring element ( 44 ), in particular a disc spring, for applying a normal force between the friction disc ( 42 ) and the first output flange ( 30 ) and / or the second output flange ( 32 ) is provided. Torsional vibration damper according to one of claims 1 to 8, characterized in that the input part ( 14 ) one with a cover disc ( 20 ) connected input flange ( 18 ), wherein the output part ( 16 ) between the input flange ( 18 ) and the cover disc ( 20 ) is arranged. Clutch disc for a friction clutch connected between a motor vehicle engine and a motor vehicle transmission, having a torsional vibration damper (US Pat. 12 ) according to one of claims 1 to 9.

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