WO2021043360A1 - Torsional vibration damper - Google Patents

Abstract

A torsional vibration damper (1) at least comprising an input part (2) and an output part (3) with a common rotational axis (5) which extends along an axial direction (4), and at least one compression spring (6), wherein, in the case of transmission of a torque, the input part (2) and the output part (3) can be rotated to a limited extent along a circumferential direction (7) relative to one another counter to a spring force of the at least one compression spring (6), wherein the torsional vibration damper (1) has at least one friction segment (8, 9) which is made from a plastic, is arranged on the input part (2) or the output part (3), and by way of which the at least one compression spring (6) can be positioned at least with respect to a radial direction (10) or with respect to the axial direction (4).

Description

Torsional vibration damper

The invention relates to a torsional vibration damper. The torsional vibration damper is used in particular in a drive train of a motor vehicle.

Torsional vibration dampers are torsional compliances that are specifically introduced into a drive train that is excited by periodic disturbances. The aim here is to shift the disruptive vibration resonances that occur in various operating situations into a speed range below the operating speeds as far as possible. Vibration resonances remaining in the operating speed range are dampened by an external or integrated friction device, the friction torque of which must be within defined limits. The friction device can in particular be designed independently of the torsional flexibility and is therefore not considered in the following.

Particularly in the case of torsional vibration dampers with a 1-flange concept, large masses of the compression springs cause high wear of the compression spring guide. In addition, the service life requirements for dampers in flybrid applications are generally significantly higher than for the clutch disks used in manual transmissions.

Various designs of compression spring guides in an arrangement with a hub flange are known from various publications. From the post-published DE 102019 117987 a torsional vibration damper is known which has the compression spring guide that is usually used. The compression spring system changes between the central hub part, here the output part, and the input part, here formed by the opposing disk and the driving disk, during the tension or thrust transition.

This results in a power flow in which, when the slip clutch is engaged, a torque of a drive unit is introduced via the drive shaft, passed on via the torsional vibration damper and the slip clutch, and discharged via the output shaft. In the case of a torsional vibration damper with a hub flange or a hub part that is coupled to an input part via pressure springs connected in series, high speeds and heavy pressure springs in particular increase the load due to centrifugal forces in the pressure spring support or pressure spring guide each time the system is changed. In addition, due to manufacturing-related dimensional deviations, components of the compression spring guide can be shifted slightly radially, so that the load on the torsional vibration damper increases. Due to the increased friction, compression springs and compression spring guides then wear out all the more. In the case of compression springs, the wire cross-section that decreases due to wear ultimately leads to breakage of the end turn of the compression spring. In addition, the high wear of the compression spring guide, z. B. a wing of the input part in the compression spring window, prevent the compression spring from being reset. After the compression spring gets stuck for a short time, it tears itself loose when you press it again and loads the end of the wing so heavily that it can break off.

It is the object of the present invention to at least partially solve the problems cited with reference to the prior art. In particular, the torsional vibration damper should be improved with regard to wear in the compression spring support or compression spring guide

A torsional vibration damper with the features according to patent claim 1 contributes to achieving these objects. Advantageous further developments are the subject of the dependent claims. The features listed individually in the patent claims can be combined with one another in a technologically sensible manner and can be supplemented by explanatory facts from the description and / or details from the figures, with further design variants of the invention being shown.

The invention relates to a torsional vibration damper at least comprising an input part and an output part with a common axis of rotation extending along an axial direction and at least one compression spring. When a torque is transmitted along a circumferential direction relative to one another, the input part and the output part are against a spring force of the at least one Compression spring can be twisted to a limited extent. The torsional vibration damper has at least one friction segment made of plastic, arranged on the input part or output part, by means of which the at least one compression spring can be positioned at least in relation to a radial direction or in relation to the axial direction.

In particular, the compression spring is supported during operation of the

Torsional vibration damper on this at least one friction segment at least in relation to the radial direction or in relation to the axial direction. When the torsional vibration damper is in operation, the compression spring is preferably supported on this at least one friction segment both in the radial direction and in relation to the axial direction.

The at least one friction segment is firmly connected to the input part or the output part and can thus replace the steel compression spring guide. When the torsional vibration damper is in operation, the compression spring is supported on the at least one friction segment, in particular in relation to the radial direction and additionally or alternatively in relation to the axial direction. The friction segment is designed in particular in such a way that it has the required wear volume of material over the service life, so that the service life of the compression spring guide can be significantly increased.

In particular, the at least one friction segment is arranged in a form-fitting manner on one of the input part and the output part.

Positive connections are created in particular by the interlocking of at least two connection partners. As a result, the connection partners cannot disengage even with or without power transmission. In other words, in the case of a positive connection, one connection partner is in the way of the other connection partner.

In particular, the at least one friction segment is additionally or alternatively arranged in a non-positive manner on one of the input part and output part, so z. B. connected via a press fit with the input part or output part. In particular, the at least one friction segment is arranged on one of the input part and the output part via an adhesive connection. In addition or as an alternative to the form-fitting and / or force-fitting connection, a fixed connection between the friction segment and the input part or output part can optionally be implemented via an adhesive connection.

In particular, the at least one friction segment is additionally or alternatively attached to one of the input part and the output part via at least one joining element. As a joining element, for. B. a rivet, a screw, a dowel pin, o. Ä. Used or inserted.

In particular, the input part is formed by a driver disk and a counter disk connected to the driver disk in a rotationally fixed manner, the output part being formed by a hub part arranged along the axial direction between the driver disk and the counter disk. In the radial direction outside the compression spring, an outer guide surface is formed by the hub part, a first lateral guide surface is formed by the driver plate, and a second lateral guide surface is formed by the counter plate. The friction segment is arranged on at least one of the guide surfaces.

The guide surface is provided in particular to support the compression spring when the torsional vibration damper is in operation, in particular in relation to the radial and / or axial direction. In particular, a friction segment is arranged on at least one or each of the guide surfaces.

In particular, at least one of the driver disk and the counter disk has a disk-shaped base body. The respective lateral guide surface is at least partially formed by a wing which, starting from the base body, extends at least in the axial direction and on which the friction segment is supported in relation to the radial direction. In particular, the wing forms a larger support surface for the friction segment than a material thickness of the base body. In particular, the base body is made from sheet metal, the wing being made from the material of the base body at least by reshaping by means of a bending process.

In particular, the wing extends along the circumferential direction along a tangent to the circumferential direction. In particular, the wing does not form a contact or contact surface for the friction segment that is curved along the circumferential direction, but rather a planar or flatly extending contact surface.

In particular, the at least one friction segment has a surface facing the compression spring, the contour of which is at least partially spherical or at least curved along the circumferential direction. In particular, this should ensure that the compression spring rests on the friction segment as uniformly as possible during operation of the torsional vibration damper.

In particular, a plurality of compression springs are arranged distributed along the circumferential direction, each extend along the circumferential direction and are elastically deformable in the circumferential direction.

A slip clutch is also proposed, at least comprising a counter plate, a pressure plate displaceable with respect to the counter plate (along the axial direction) and a clutch disc arranged between the counter plate and the pressure plate and at least the torsional vibration damper described.

The use of indefinite articles (one, one, one and one), in particular in the patent claims and the description reproducing them, is to be understood as such and not as a numerical word. The terms or components introduced in this way are to be understood in such a way that they are present at least once and in particular can also be present several times.

As a precaution, it should be noted that the numerals used here (first, second,) primarily (only) serve to distinguish between several similar objects, sizes or processes, i.e. in particular no dependency and / or Specify the sequence of these objects, sizes or processes in relation to one another. Should a dependency and / or sequence be required, this is explicitly stated here or it is obvious to a person skilled in the art when studying the specifically described embodiment. If a component can occur several times (at least one), the description of one of these components can apply equally to all or part of the majority of these components, but this is not mandatory.

The invention and the technical environment are explained in more detail below with reference to the accompanying figures. It should be pointed out that the invention is not intended to be restricted by the exemplary embodiments cited. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description. In particular, it should be pointed out that the figures and in particular the size relationships shown are only schematic. Show it:

Fig. 1: a slip clutch with a known one

Torsional vibration damper, in a side view in section;

2: a torsional vibration damper in a side view in section;

FIG. 3: a first detail of the torsional vibration damper according to FIG. 2 in one

Side view;

4 shows a second detail of the torsional vibration damper according to FIGS. 2 and 3 in a perspective view in section;

5: a third detail of the torsional vibration damper according to FIGS. 2 to 4 in a side view; and

6: a fourth detail of the torsional vibration damper according to FIGS. 2 to 5 in a perspective view in section. Fig. 1 shows a slip clutch 21 with a known torsional vibration damper 1, in a side view in section. The slip clutch 21 comprises a counter plate 22, a pressure plate 23 which can be displaced in relation to the counter plate 22 along the axial direction 4 and a clutch plate 24 arranged between the counter plate 22 and the pressure plate 23 and a known torsional vibration damper 1 Slipping clutch 21, a torque of a drive unit is introduced via the drive shaft 25, passed on via the torsional vibration damper 1 and the slipping clutch 21 and passed out via the output shaft 26.

The torsional vibration damper 1 comprises an input part 2 and an output part 3 with a common axis of rotation 5 extending along an axial direction 4 and a compression spring 6. When a torque is transmitted along a circumferential direction 7, the input part 2 and the output part 3 are relative to one another against a spring force of the Compression spring 6 rotatable to a limited extent. The torsional vibration damper 1 has an outer guide surface 14 on the output part 3 for supporting the compression spring 6 in relation to the radial direction 10. The input part 2 is formed by a driver disk 12 and a counter disk 13, which are connected to one another in a rotationally fixed manner via rivets 27.

The drive plate 12 has a first lateral guide surface 15 and the counter plate 13 has a second lateral guide surface 16. During operation of the torsional vibration damper 1, the compression spring 6 can be supported with respect to the radial direction 10, but also with respect to the axial direction 4, via the lateral guide surfaces 15, 16.

Fig. 2 shows a torsional vibration damper 1 in a side view in section. Reference is made to the statements relating to FIG. 1. In contrast to the torsional vibration damper 1 according to FIG. 1, the guide surfaces 14, 15, 16 are designed differently here.

The torsional vibration damper 1 has on the input part 2 and on the output part 3 each friction segments 8, 9 made of a plastic, through which the compression spring 6 relative to a radial direction 10 and relative to the axial Direction 4 can be positioned or on which the compression spring 6 can be supported with respect to the specified directions 4, 10 during operation of the torsional vibration damper 1. Here, a first friction segment 8 is arranged on the output part 3 and a second friction segment 9 is arranged on each of the drive plate 12 and counter-plate 13.

The friction segments 8, 9 are each firmly connected to the input part 2 or the output part 3 and can thus replace the steel compression spring guide (see FIG. 1). During operation of the torsional vibration damper 1, the compression spring 6 is supported against the radial direction 10 and additionally in the axial direction 4 on the friction segment 8, 9.

The input part 2 is formed by a driver disk 12 and a counter-disk 13 connected to the driver disk 12 in a rotationally fixed manner, the output part 3 being formed by a hub part arranged along the axial direction 4 between the driver disk 12 and the counter-disk 13. In the radial direction 10 outside the compression spring 6, an outer guide surface 14 is formed by the hub part, a first lateral guide surface 15 by the driver plate 12 and a second lateral guide surface 16 by the counter disk 13. A friction segment 8, 9 is arranged on each of the guide surfaces 14, 15, 16.

Each friction segment 8, 9 is arranged in a form-fitting manner on one of the input part 2 and output part 3.

Both the driver disk 12 and the counter disk 13 each have a disk-shaped base body 17. The respective lateral guide surface 15, 16 is at least partially formed by a wing 18 which extends from the base body 17 at least in the axial direction 4 and on which the respective second friction segment 9 is supported in relation to the radial direction 10. The wing 18 clearly forms a larger support surface for the second friction segment than an otherwise constant material thickness of the base body 17. The base body 17 is made from sheet metal, the wing 18 being made from the material of the base body 17 by means of a bending process, at least by forming.

It can be seen from FIGS. 2, 5 and 6 that the wing 18 runs along the circumferential direction 7 along a tangent 19 to the circumferential direction 7. The wing 18 therefore does not form a contact or contact surface for the second friction segment 9 that is curved along the circumferential direction 7, but rather a planar or flatly extending contact surface or lateral guide surface 15, 16.

The friction segments 8, 9 have a surface 20 facing the compression spring 6, the contour of which is at least partially spherical in the case of the second friction segments 9 or curved in the case of the first friction segment 8 at least along the circumferential direction 7. This is intended to ensure that the compression spring 6 contacts the friction segments 8, 9 as uniformly as possible during operation of the torsional vibration damper 1.

FIG. 3 shows a first detail of the torsional vibration damper 1 according to FIG. 2 in a side view. Only the output part 3 and the first friction segment 8, which is suspended in it via clips 28 and connected in a form-fitting manner, are shown here. Reference is made to the statements relating to FIG. 2.

4 shows a second detail of the torsional vibration damper 1 according to FIGS. 2 and 3 in a perspective view in section. The output part 3 with the first friction segment 8 and the counter-disk 13 with the second friction segment 9 are shown here. Reference is made to the statements relating to FIG. 2.

FIG. 5 shows a third detail of the torsional vibration damper 1 according to FIGS. 2 to 4 in a side view. The counter disk 13 (with the side facing the driver disk 12) with the second friction segment 9 is shown here. The second friction segment 9 is fastened to the counter disk 13 as joining elements 11 by means of rivets 27. It can be seen from FIGS. 5 and 6 that the wing 18 runs along the circumferential direction 7 along a tangent 19 to the circumferential direction 7. The wing 18 thus does not form any contact or contact points curved along the circumferential direction 7. Contact surface for the second friction segment 9, but rather a planar or flatly extending contact surface or lateral guide surface 15, 16. Reference is made to the statements relating to FIG. 2. 6 shows a fourth detail of the torsional vibration damper 1 according to FIGS. 2 to 5 in a perspective view in section. The drive plate 12 is shown here with the second friction segment 9, which is fastened to the base body 17 of the drive plate 12 by means of rivets 27. The second friction segment 9 is supported on the wing 18 of the drive plate 12 in relation to the radial direction 10.

List of reference symbols

1 torsional vibration damper

2 input part

3 output part

4 axial direction

5 axis of rotation

6 compression spring

7 circumferential direction

8 first friction segment

9 second friction segment

10 radial direction

11 joining element

12 drive plate

13 counter disc

14 outer guide surface

15 first lateral guide surface

16 second lateral guide surface

17 base body

18 blades

19 tangent

20 surface

21 Slipping clutch

22 counter plate

23 pressure plate

24 clutch disc

25 drive shaft

26 output shaft

27 rivet

28 clip

Claims

Claims 1. Torsional vibration damper (1), at least comprising an input part (2) and an output part (3) with a common axis of rotation (5) extending along an axial direction (4) and at least one compression spring (6), the input part (2) and the output part (3) can be rotated to a limited extent relative to one another against a spring force of the at least one compression spring (6) when a torque is transmitted along a circumferential direction (7), the torsional vibration damper (1) at least one on the input part (2) or the output part ( 3) has arranged friction segment (8, 9) made of a plastic, by means of which the at least one compression spring (6) can be positioned at least in relation to a radial direction (10) or in relation to the axial direction (4). 2. Torsional vibration damper (1) according to claim 1, wherein the at least one friction segment (8, 9) is arranged in a form-fitting manner on one of the input part (2) and the output part (3). 3. Torsional vibration damper (1) according to one of the preceding claims, wherein the at least one friction segment (8, 9) is arranged via an adhesive connection on one of the input part (2) and output part (3). 4. Torsional vibration damper (1) according to one of the preceding claims, wherein the at least one friction segment (8, 9) is attached to one of the input part (2) and output part (3) via at least one joining element (11). 5. Torsional vibration damper (1) according to one of the preceding claims, wherein the input part (2) is formed by a drive plate (12) and a counter-plate (13) connected in a rotationally fixed manner to the drive plate (12), the output part (3) by a along the axial direction (4) between the drive plate (12) and the counter plate (13) arranged hub part is formed; whereby in the radial direction (10) outside the compression spring (6) an outer guide surface (14) is formed by the hub part, a first lateral guide surface (15) is formed by the driver disc (12) and a second lateral guide surface (16) is formed by the counter disc (13); wherein the friction segment (8, 9) is arranged on at least one of the guide surfaces (14, 15, 16). 6. Torsional vibration damper (1) according to claim 5, wherein at least one of the drive plate (12) and the counter plate (13) has a disk-shaped base body (17), the lateral guide surface (15, 16) at least partially being supported by a base body ( 17) is formed at least in the axial direction (4) extending wing (18) on which the friction segment (8, 9) is supported in relation to the radial direction (10). 7. Torsional vibration damper (1) according to claim 5, wherein the wing (18) extends along the circumferential direction (7) along a tangent (19) to the circumferential direction (7). 8. Torsional vibration damper (1) according to one of the preceding claims, wherein the at least one friction segment (8, 9) has a surface (20) facing the compression spring (6), the contour of which is at least partially spherical or at least curved along the circumferential direction (7) is. 9. Torsional vibration damper (1) according to one of the preceding claims, wherein a plurality of compression springs (6) are arranged distributed along the circumferential direction (7), each extending along the circumferential direction (7) and are elastically deformable in the circumferential direction (7). 10. Slipping clutch (21) at least comprising a counter plate (22), a pressure plate (23) which can be displaced with respect to the counter plate (22) and a clutch disc (24) arranged between the counter plate (22) and the pressure plate (23) and at least one torsional vibration damper ( 1) according to one of the preceding claims.