DE102023100694A1 - Torsional vibration damper - Google Patents

Abstract

Torsional vibration damper (1) of a torque transmission device, with a rotation axis (4) extending along an axial direction (2, 3), at least comprising an input side (5) and an output side (7) rotatable relative to the input side (5) in a circumferential direction (6), and additionally a friction device (8) which has at least a first hysteresis and a second hysteresis depending on a rotation (9) of the input side (5) relative to the output side (7).

Description

The invention relates to a torsional vibration damper which is used in particular to reduce torsional vibrations in a drive train. The torsional vibration damper can be used as a torque transmission device or as a component of a torque transmission device in particular in a motor vehicle, preferably in the drive train of a motor vehicle, particularly preferably in a hybridized drive train in which, for example, an electric machine and an internal combustion engine are used to drive the motor vehicle.

Torsional vibration dampers are known from the automotive sector, for example, to even out rotational irregularities and thus reduce torque shocks and/or noise emissions. Torsional vibration dampers can be combined with friction clutches, for example, to form compact, switchable torque transmission devices.

A torsional vibration damper comprises at least one input side, an output side rotatable relative to the input side in a circumferential direction, and at least one intermediate element which is supported on at least one energy storage element and is mounted on at least one rolling element so as to be oscillatable on at least one of the input side and output side and reduces rotational irregularities during operation.

In addition, a torsional vibration damper includes a friction device that can set different hystereses depending on the rotation of the input side relative to the output side. Hysteresis refers to the difference between the damping characteristics of the torsional vibration damper when the torsional vibration damper is loaded and unloaded with a torque. Hysteresis therefore refers to the energy dissipation due to the damping caused by the friction device. Depending on the degree of rotation between the input side and the output side, it is possible to switch between different damping characteristics and thus different hystereses.

A particularly efficient torsional vibration damper is, for example, referred to as a pendulum rocker damper, which comprises, as an intermediate element, a plurality of rocker elements connecting the input side with the output side, which are prestressed against one another via spring devices, wherein the input side, output side and rocker elements each have movement paths in which rolling elements are movably arranged, which on the one hand connect the input side and the rocker elements and on the other hand connect the rocker elements and the output side.

From the EN 10 2014 218 498 A1 A torsional vibration damper is known in which the damping is carried out via friction elements that form friction pairs with each other on different radii depending on an angular range of rotation between the input side and output side. However, with such solutions, high edge loads can occur when the friction pair changes.

There is a constant need to further develop such torsional vibration dampers, whereby in particular edge wear is prevented and a longer service life is achieved.

Based on this, the present invention is based on the object of at least partially alleviating the problems described at the outset. In particular, a torsional vibration damper is to be proposed which has a variably adjustable hysteresis.

This object is achieved with a torsional vibration damper according to the features of independent claim 1. Further advantageous embodiments of the invention are specified in the dependent claims. The features listed individually in the dependent claims can be combined with one another in a technologically meaningful manner and can define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, with further preferred embodiments of the invention being presented.

• • eine Rampeneinrichtung mit einem, mit der einen von Eingangsseite und Ausgangsseite drehfest verbundenem ersten Rampenelement und einem mit der anderen von Eingangsseite und Ausgangsseite drehfest verbundenem zweiten Rampenelement; wobei das zweite Rampenelement infolge der Verdrehung entlang der Drehachse verlagerbar ist; und
• • eine Federeinrichtung mit einer ersten Tellerfeder für die erste Hysterese und mit einer zweiten Tellerfeder für die zweite Hysterese sowie einer Stützscheibe.

A torsional vibration damper with a rotation axis extending along an axial direction is proposed. This is in particular a torque transmission device or a component of a torque transmission device, e.g. combined with a friction clutch. The torsional vibration damper comprises at least one input side, an output side that can be rotated in a circumferential direction relative to the input side, and additionally a friction device that has at least a first hysteresis and a second hysteresis depending on a rotation of the input side relative to the output side. The friction device comprises

• • a ramp device with a first ramp element connected in a rotationally fixed manner to one of the input side and output side and a second ramp element connected to the other of the input side and output side in a rotationally fixed manner; wherein the second ramp element is displaceable along the axis of rotation as a result of the rotation; and
• • a spring device with a first disc spring for the first hysteresis and with a second disc spring for the second hysteresis as well as a support disk.

Starting from an untwisted state of the friction device, during a first displacement of the second ramp element along an axial first direction, initially only the first disc spring can be actuated and during a further second displacement along the first direction, the first disc spring can be displaced together with the support disk along the axis of rotation and the second disc spring can thus be actuated.

In particular, the torsional vibration damper comprises at least one intermediate element which is supported on at least one energy storage element and is mounted on at least one rolling element so as to be able to swing on at least one of the input side and the output side. The intermediate element thus reduces rotational irregularities during operation of the torsional vibration damper.

Each ramp element has at least one ramp that extends along a circumferential direction and is inclined relative to the axial direction. The ramps of the ramp elements slide on one another. In particular, each ramp element has a plurality of ramps along the circumferential direction.

The rotation of the input side relative to the output side takes place starting from an untwisted state of the friction device by an angular range. During the rotation, the at least one ramp of the first ramp element slides along the at least one ramp of the second ramp element, wherein a relative displacement of the ramp elements relative to the axial direction takes place as a result of the relative rotation.

In particular, the first ramp element is arranged stationary relative to the axial direction, so that in the event of a rotation between the input side and the output side, only the second ramp element is displaced along the axial direction.

In particular, a friction connection of the friction device is formed between the first ramp element and the second ramp element. In particular, the friction connection is formed by the mutually contacting surfaces of the at least one ramp per ramp element.

In particular, the first ramp element, the first disc spring, the support disk and the second disc spring are connected to one another in a rotationally fixed manner. In particular, only the second ramp element (as a component of the friction device) is arranged such that it can rotate in the circumferential direction relative to these other components (the friction device). However, a rotationally fixed arrangement of the first disc spring, support disk and second disc spring is not absolutely necessary. In particular, it must only be ensured that the first ramp element and the second ramp element can rotate relative to one another so that the displacement of the second ramp element can be realized along the axial direction.

In particular, the second ramp element is arranged along the axial direction between the first ramp element and the first disc spring.

In particular, a spring force of the first disc spring is lower than a spring force of the second disc spring.

In particular, the second disc spring is preloaded in the untwisted state.

In particular, the support disc is supported, at least in the untwisted state, on a stop opposite to a second axial direction running opposite to the first direction.

In particular, the stop is arranged along the axial direction between the support disk and the first disc spring.

In particular, only the support disc contacts the stop.

In particular, the friction device additionally comprises a base plate and a cover connected to the base plate, wherein the base plate forms the first ramp element and the second ramp element, the first disc spring, the support disk and the second disc spring are arranged along the axial direction between the base plate and the cover.

In particular, the second disc spring is supported on the cover opposite to the first axial direction.

In particular, the support disk is supported, at least in the untwisted state, on a stop opposite to a second axial direction running opposite to the first direction, wherein the stop is connected to the cover in a rotationally fixed and axially fixed manner.

The rotation of the input side relative to the output side takes place starting from an untwisted state of the friction device by an angular range. During the rotation, the at least one ramp of the first ramp element slides along the at least one ramp of the second ramp element, whereby a relative displacement of the ramp elements relative to the axial direction occurs as a result of the relative rotation. The first disc spring is initially actuated by the second ramp element. As the displacement of the second ramp element increases, the first disc spring rests against the support disk, so that with a further (second) displacement, only the second disc spring can now be deformed.

The (exclusive) deformation of the first disc spring forms the first hysteresis. The (exclusive) deformation of the second disc spring forms the second hysteresis.

In particular, the disc springs and the support disk as well as the ramp elements are designed as ring elements or disk-shaped elements, i.e. they extend along the circumferential direction completely around the axis of rotation.

In particular, all components of the friction device (as well as the torsional vibration damper) are arranged coaxially to each other and to the axis of rotation.

The disc springs and the first ramp element as well as the control disk consist in particular of metallic material, in particular of steel. The second ramp element consists in particular of a plastic material.

In particular, the torsional vibration damper is a pendulum rocker damper which comprises, as an intermediate element, a plurality of rocker elements connecting the input side to the output side, which are prestressed against one another via spring devices, wherein the input side, output side and rocker elements each have movement paths in which rolling elements are movably arranged, which on the one hand connect the input side and the rocker elements and on the other hand connect the rocker elements and the output side.

The torsional vibration damper can be used or is used as a torque transmission device or as a component of a torque transmission device, in particular in a motor vehicle, preferably in the drive train of a motor vehicle.

The use of indefinite articles ("a", "an", "an" and "another"), particularly in the patent claims and the description reflecting them, is to be understood as such and not as a number. Terms or components introduced accordingly are therefore to be understood as being present at least once and, in particular, can also be present multiple times.

As a precaution, it should be noted that the numerals used here ("first", "second", ...) primarily serve (only) to distinguish between several similar objects, sizes or processes, and in particular do not necessarily specify a dependency and/or sequence of these objects, sizes or processes. If a dependency and/or sequence is required, this is explicitly stated here or it is obvious to the person skilled in the art when studying the specifically described design. If a component can occur multiple 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.

• 1: einen Torsionsschwingungsdämpfer mit einer Reibeinrichtung in einer perspektivischen Ansicht;
• 2: den Torsionsschwingungsdämpfer nach 1 in einer Seitenansicht im Schnitt;
• 3: die Reibeinrichtung des Torsionsschwingungsdämpfers nach 1 und 2 in einer Explosionsdarstellung in einer perspektivischen Ansicht;
• 4: ein Detail der 2;
• 5: die Reibeinrichtung in einem unverdrehten Zustand;
• 6: die Reibeinrichtung nach 5 in einem teilweise verdrehten Zustand; und
• 7: die Reibeinrichtung nach 6 in einem vollständig verdrehten Zustand.

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

• 1 : a torsional vibration damper with a friction device in a perspective view;
• 2 : the torsional vibration damper after 1 in a side view in section;
• 3 : the friction device of the torsional vibration damper according to 1 and 2 in an exploded view in a perspective view;
• 4 : a detail of the 2 ;
• 5 : the friction device in an untwisted state;
• 6 : the friction device according to 5 in a partially twisted state; and
• 7 : the friction device according to 6 in a completely twisted state.

1 shows a torsional vibration damper 1 with a friction device 8 in a perspective view. 2 shows the torsion vibration damper 1 after 1 in a side view in section. The 1 and 2 are described together below.

The torsional vibration damper 1 with a rotation axis 4 extending along an axial direction 2, 3 comprises an input side 5, an output side 7 rotatable relative to the input side 5 in a circumferential direction 6 and at least one intermediate element 22 which is supported on at least one energy storage element 23 on at least one rolling element 24 and is mounted so as to swing on at least one of the input side 5 and output side 7 and reduces rotational irregularities during operation of the torsional vibration damper 1.

In addition, the torsional vibration damper 1 comprises a friction device 8, which can set different hystereses depending on a rotation of the input side 5 relative to the output side 7. Depending on the degree of rotation between the input side 5 and the output side 7, it is possible to switch between different damping characteristics and thus different hystereses.

3 shows the friction device of the torsional vibration damper after 1 and 2 in an exploded view in a perspective view. 4 shows a detail of the 2 . 5 shows the friction device 8 in an untwisted state. 6 shows the friction device 8 after 5 in a partially twisted state. 7 shows the friction device 8 after 6 in a completely twisted state. 3 to 7 are described together below. Please refer to the explanations on the 1 and 2 is referred to.

The 5 to 7 serve only to clarify the function of the friction device 8. A rotation 9 of the ramp elements 11, 12 relative to each other causes a displacement 17, 18 of the second ramp element 12 along the axial direction 2, 3. The second ramp element 12 contacts the first disc spring 14 and deforms it successively ( 5 ) until the first disc spring 14 rests against the support disc 16 at the end of the first displacement 17 ( 6 ). Starting from this position, the second displacement 18 takes place, in which the second ramp element 12 is displaced further along the first direction 2. The second ramp element 12 contacts the first disc spring 14, which now displaces the support disk 16 away from the stop 19 and in the process successively deforms the second disc spring 15, which is supported on the cover 21.

The torsional vibration damper 1 comprises an input side 5, an output side 7 which can be rotated relative to the input side 5 in a circumferential direction 6, and additionally a friction device 8 which has a first hysteresis and a second hysteresis depending on a rotation 9 of the input side 5 relative to the output side 7. The friction device 8 comprises a ramp device 10 with a first ramp element 11 which is connected in a rotationally fixed manner to the input side 5 and a second ramp element 12 which is connected in a rotationally fixed manner to the output side 7. The second ramp element 12 can be displaced along the axis of rotation 4 as a result of the rotation 9. The friction device 8 also comprises a spring device 13 with a first disc spring 14 for the first hysteresis and with a second disc spring 15 for the second hysteresis, as well as a support disk 16.

Starting from an untwisted state of the friction device 8, a first displacement 17 (see 5 and 6 ) of the second ramp element 12 along an axial first direction 2, initially only the first disc spring 14 can be actuated and with a further second displacement 18 (see 7 ) along the first direction 2, the first disc spring 14 together with the support disk 16 can be displaced along the axis of rotation 4 and thereby the second disc spring 15 can be actuated.

Each ramp element 11, 12 has a plurality of ramps which extend along the circumferential direction 6 and are inclined relative to the axial direction 2, 3 (see 3 ). The ramps of the ramp elements 11, 12 slide over each other.

The rotation of the input side 5 relative to the output side 7 takes place by an angular range starting from an untwisted state of the friction device 8. During the rotation 9, the ramps of the first ramp element 11 slide along the ramps of the second ramp element 12, whereby a relative displacement 17, 18 of the ramp elements 11, 12 relative to the axial direction 2, 3 takes place as a result of the relative rotation 9.

The first ramp element 11 is arranged stationary relative to the axial direction 2, 3, so that in the event of a rotation 9 between the input side 5 and the output side 7, only the second ramp element 12 is displaced along the axial direction 2, 3.

A friction connection of the friction device 8 is formed between the first ramp element 11 and the second ramp element 12. The friction connection is formed by the mutually contacting surfaces of the ramps of each ramp element 11, 12.

The second ramp element 12 is arranged along the axial direction 2, 3 between the first ramp element 11 and the first disc spring 14.

A spring force of the first disc spring 14 is less than a spring force of the second disc spring 15.

In the untwisted state of the friction device 8, the second disc spring 15 is preloaded.

The support disc 16 is supported at least in the untwisted state (see 5 ) at a stop 19 opposite a second axial direction 3 running opposite to the first direction 2. The stop 19 is arranged along the axial direction 2, 3 between the support disk 16 and the first disc spring 14.

In this case, only the support disk 16 contacts the stop 19. The stop 19 is formed by stepped bolts 25 which are fastened to the cover 21 of the friction device 8. The stop 19 is formed by a flange of the stepped bolt 25.

The friction device 8 additionally has a base plate 20 and a cover 21 connected to the base plate 20, wherein the base plate 20 forms the first ramp element 11 and the second ramp element 12, the first disc spring 14, the support disk 16 and the second disc spring 15 are arranged along the axial direction 2, 3 between the base plate 20 and the cover 21.

The second disc spring 15 is supported on the cover 21 opposite the axial first direction 2.

The support disc 16 is supported at least in the untwisted state (see 5 ) on the stop 19 opposite to a second axial direction 3 running opposite to the first direction 2, wherein the stop 19 is connected to the cover 21 in a rotationally fixed and axially fixed manner.

The rotation 9 of the input side 5 relative to the output side 7 takes place starting from an untwisted state of the friction device 8 by an angular range. During the rotation 9, the ramps of the first ramp element 11 slide along the ramps of the second ramp element 12, whereby a relative displacement 17, 18 of the ramp elements 11, 12 relative to the axial direction 2, 3 occurs as a result of the relative rotation 9. The first ramp element 11 is arranged in a fixed position relative to the axial direction 2, 3 and only the second ramp element 12 is displaced along the axial direction 2, 3. The first plate spring 14 is initially actuated by the second ramp element 12. As the displacement 17, 18 of the second ramp element 12 increases, the first plate spring 14 rests against the support disk 16 (see 6 ), so that in the case of a further second displacement 18 resulting therefrom, only the second disc spring 15 is deformable.

The first displacement 17 comprises the exclusive displacement of the first disc spring 14. The second displacement 18 comprises the displacement of the first disc spring 14, the support disk 16 and the second disc spring 16. During the first displacement 17, only the first disc spring 14 is deformed. During the second displacement 18, only the second disc spring 15 is deformed.

The (exclusive, first) deformation 17 of the first disc spring 14 forms the first hysteresis. The (exclusive, second) deformation 18 of the second disc spring 15 forms the second hysteresis.

The disc springs 14, 15 and the support disk 16 as well as the ramp elements 11, 12 are designed as ring elements or disk-shaped elements, i.e. they extend along the circumferential direction 6 completely around the axis of rotation 4.

All (or certain) components (input side 5, output side 7, first ramp element 11, second ramp element 12, first disc spring 14, second disc spring 15, support disk 16, base plate 20, cover 21) of the friction device 8 and of the torsional vibration damper 1 are arranged coaxially to one another and to the axis of rotation 4.

The disc springs 14, 15 and the first ramp element 11 as well as the support disk 16 are made of metallic material, in particular steel. The second ramp element 12 is made of a plastic material.

List of reference symbols

1

Torsional vibration damper

2

first direction

3

second direction

4

Rotation axis

5

Home page

6

Circumferential direction

7

Home Page

8th

Friction device

9

Twisting

10

Ramp facility

11

first ramp element

12

second ramp element

13

Spring device

14

first disc spring

15

second disc spring

16

Support disc

17

first relocation

18

second relocation

19

attack

20

Base plate

21

Lid

22

Intermediate element

23

Energy storage element

24

Rolling elements

25

Stepped bolts

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was 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 accepts no liability for any errors or omissions.

Cited patent literature

• DE 102014218498 A1 [0006]

Claims (10)

Torsional vibration damper (1) of a torque transmission device, with a rotation axis (4) extending along an axial direction (2, 3), at least comprising an input side (5) and an output side (7) that can be rotated relative to the input side (5) in a circumferential direction (6), and additionally a friction device (8) that has at least a first hysteresis and a second hysteresis depending on a rotation (9) of the input side (5) relative to the output side (7); wherein the friction device (8) • a ramp device (10) with a first ramp element (11) that is connected in a rotationally fixed manner to one of the input side (5) and output side (7) and a second ramp element (12) that is connected in a rotationally fixed manner to the other of the input side (5) and output side (7); wherein the second ramp element (12) can be displaced along the rotation axis (4) as a result of the rotation (9); and • a spring device (13) with a first disc spring (14) for the first hysteresis and with a second disc spring (15) for the second hysteresis as well as a support disk (16); wherein, starting from an untwisted state of the friction device (8), during a first displacement (17) of the second ramp element (12) along an axial first direction (2), initially only the first disc spring (14) can be actuated and during a further second displacement (18) along the first direction (2), the first disc spring (14) can be displaced together with the support disk (16) along the axis of rotation (4) and the second disc spring (15) can be actuated as a result. Torsional vibration damper (1) according to Claim 1 , wherein a friction connection of the friction device (10) is formed between the first ramp element (11) and the second ramp element (12). Torsional vibration damper (1) according to one of the preceding claims, wherein the first ramp element (11), the first disc spring (14), the support disk (16) and the second disc spring (15) are connected to one another in a rotationally fixed manner. Torsional vibration damper (1) according to one of the preceding claims, wherein the second ramp element (12) is arranged along the axial direction (2, 3) between the first ramp element (11) and the first disc spring (14). Torsional vibration damper (1) according to one of the preceding claims, wherein a spring force of the first disc spring (14) is less than a spring force of the second disc spring (15). Torsional vibration damper (1) according to one of the preceding claims, wherein in the untwisted state the second disc spring (15) is prestressed. Torsional vibration damper (1) according to one of the preceding claims, wherein the support disk (16), at least in the untwisted state, is supported on a stop (19) opposite to an axial second direction (3) running opposite to the first direction (2). Torsional vibration damper (1) according to one of the preceding claims, wherein the friction device (8) additionally has a base plate (20) and a cover (21) connected to the base plate (20), wherein the base plate (20) forms the first ramp element (11) and the second ramp element (12), the first disc spring (14), the support disk (16) and the second disc spring (15) are arranged along the axial direction (2, 3) between the base plate (20) and the cover (21). Torsional vibration damper (1) according to Claim 8 , wherein the second disc spring (15) is supported on the cover (21) opposite the axial first direction (2). Torsional vibration damper (1) according to one of the preceding Claims 8 and 9 , wherein the support disk (16) is supported, at least in the untwisted state, on a stop (19) opposite to an axial second direction (3) running opposite to the first direction (2), wherein the stop (19) is connected to the cover (21) in a rotationally fixed and axially fixed manner.

Images