DE102021128549A1 - Torsional vibration damping device with removable hub body - Google Patents

Abstract

Torsional vibration damping device (1) for a drive train of a motor vehicle, with an axis of rotation (3) extending in an axial direction (2), a primary component (4) and a secondary component (5 ) spring damper (6), with a hub body (7) prepared for connection to a transmission shaft and with a slipping clutch (8) inserted to act between the secondary component (5) and the hub body (7), the hub body (7) having a positive connection (9) is non-rotatably connected to an output part (10) of the slipping clutch (8); wherein the positive connection (9) is arranged along the axial direction (2) between the output part (10) and a locking washer (11) arranged coaxially to the axis of rotation (3), wherein in an assembled state the locking washer (11) is connected to the output part (10) is fixed relative to the axial direction (2); the locking washer (11) being detachable from the output part (10) in a dismantled state, thus enabling the hub body (7) to be pulled out axially from the form-fitting connection (9).

Description

The invention relates to a torsional vibration damping device for a drive train of a motor vehicle, such as a car, truck, bus or other commercial vehicle, with a spring damper having a primary component and a secondary component that can be rotated relative to the primary component in a limited angular range with spring damping, with a spring damper prepared for connection to a transmission shaft Hub body and with a slipping clutch acting between the secondary component and the hub body, wherein the hub body is non-rotatably connected to an output part of the slipping clutch via a positive connection.

Generic torsional vibration damping devices are already well known from the prior art. For example, the DE 10 2019 120 219 A1 a generic vibration damping unit with a release device for a torque limiter. Further state of the art is with the DE 20 2020 102 864 U1 known.

In known torsional vibration damping devices, the primary component and the hub body usually have to be brought into a certain relative rotational position to one another in order to remove the torsional vibration damping device from the drive train again in order to gain access to the screws connecting the primary component to a crankshaft of an internal combustion engine. This is necessary because after the first opening of the slip clutch during operation, the primary component and hub body no longer have the same relative angular position to one another as they originally had during assembly. In the past, a relatively high force has frequently been exerted in order to reset the hub body relative to the primary component. Under certain circumstances, this can lead to improper overloading of the hub body and thus to damage to the torsional vibration damping device.

It is therefore the object of the present invention to provide a torsional vibration damping device which can be dismantled in the event of maintenance with as few work steps as possible and with little effort.

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

• • eine sich in einer axialen Richtung erstreckende Drehachse,
• • einen Federdämpfer, der einen Primärbestandteil und einen relativ zu dem Primärbestandteil in einem begrenzten Winkelbereich federgedämpft verdrehbaren Sekundärbestandteil aufweist,
• • einen zur Verbindung mit einer Getriebewelle vorbereiteten Nabenkörper und
• • eine zwischen dem Sekundärbestandteil und dem Nabenkörper wirkend eingesetzten Rutschkupplung sowie
• • eine Sicherungsscheibe.

Der Nabenkörper ist über eine Formschlussverbindung drehfest mit einem Ausgangteil der Rutschkupplung verbunden. Die Formschlussverbindung ist entlang der axialen Richtung zwischen dem Ausgangsteil und der koaxial zur Drehachse angeordneten Sicherungsscheibe angeordnet. In einem Montagezustand ist die Sicherungsscheibe mit dem Ausgangsteil gegenüber der axialen Richtung fest verbunden. In einem Demontagezustand ist die Sicherungsscheibe von dem Ausgangsteil lösbar und gibt so ein axiales Herausziehen des Nabenkörpers aus der Formschlussverbindung frei.A torsional vibration damping device for a drive train of a motor vehicle is proposed. The torsional vibration damping device includes

• • an axis of rotation extending in an axial direction,
• • a spring damper, which has a primary component and a secondary component that can be rotated relative to the primary component in a limited angular range in a spring-damped manner,
• • a hub body prepared for connection to a transmission shaft and
• • a slipping clutch acting between the secondary component and the hub shell, and
• • a lock washer.

The hub body is non-rotatably connected to an output part of the slipping clutch via a positive connection. The positive connection is arranged along the axial direction between the output part and the locking washer arranged coaxially to the axis of rotation. In an assembled state, the locking washer is firmly connected to the output part in relation to the axial direction. In a dismantled state, the lock washer can be detached from the starting part and thus enables the hub body to be pulled out axially from the form-fitting connection.

The lock washer is in particular disc-shaped and/or ring-shaped. The locking washer is detachably connected to the output part.

With such a locking washer, the hub body can be released from the connection with the output part in the event of maintenance using simple means and low disassembly forces, and the entire torsional vibration damping device can then be quickly disassembled. In addition, the locking washer is easy to produce and has a low weight.

In particular, an extension of the output part extends so far along the axial direction through an opening in the locking washer that a securing element can be arranged on the extension, by means of which the locking washer is firmly connected to the output part in relation to the axial direction in the assembled state.

The extension and the opening are designed in particular in such a way that the locking washer can be rotated by at most five, preferably at most two, angular degrees along the circumferential direction relative to the extension.

The securing element serves in particular to fix the securing washer on the extension and thus on the output part in relation to the axial direction.

In the assembled state, the locking washer is firmly connected to the output part in relation to the axial direction. In this state, the torsional vibration damping device can be operated in a motor vehicle. In the dismantled state, the lock washer can be detached from the output part and can therefore be removed from the output part. With the lock washer removed, the hub body can then be pulled out axially from the form-fitting connection. In the dismantled state, in particular the screw connections between the primary component and the crankshaft are accessible. These screw connections can then be easily loosened and the torsional vibration damping device can be dismantled from the drive train.

In particular, the extension is formed by a pin which extends along the axial direction through a bore of the output part and through the opening. The pin, the bore and the opening are designed in particular in such a way that the locking washer can be rotated by at most five, preferably at most two, angular degrees along the circumferential direction relative to the bore.

In particular, the pin has a head which has a larger diameter than the bore, the pin extending from the head through the bore and the opening. Through the head and the securing element, the pin is arranged in a fixed manner with respect to the axial direction on the components of the output part and the securing disk.

In particular, the securing element is at least partially arranged in a circumferential groove on the extension and/or in a through hole in the extension.

For example, the securing element can be designed as a known spring clip that can be slid onto the extension. The spring clip is in particular elastically deformable. When pushed on, the spring clip is elastically deformed and expanded in the process. Are the struts of the spring clip over the diameter of the extension or z. B. of the pin is pushed away and the spring clip is arranged in the groove, the spring clip deforms back at least partially, so that an at least non-positive connection is formed between the spring clip and the extension or pin.

Alternatively, the securing element can be designed as a known securing pin. This can be placed in the through hole. In particular, the securing strip extends beyond the through hole on both sides. The locking pin may have an elastically deformable part that is located outside of the through hole and extends along a peripheral surface of the extension. When the locking pin is pushed into the through-hole, this part outside the through-hole is elastically deformed and expanded in the process. As soon as the locking pin is arranged in the through hole as intended, the deformed part deforms back at least partially, so that an at least non-positive connection is formed between the locking pin and the extension.

In particular, the securing element can be removed from the groove or the through-hole in a direction perpendicular to the axis of rotation in order to establish the disassembled state.

In particular, in the mounted state, the securing element produces a preload in relation to the axial direction, so that the securing washer is supported on the securing element and presses the hub body against a contact surface of the output part. As a result, the hub body is fixed with as little play as possible during normal operation of the torsional vibration damping device.

In particular, several, z. B. two, three or more, possibly up to six or more extensions in a circumferential direction (uniformly) distributed.

The extensions and openings are then formed in the same way and accommodated at the corresponding points on the starting part. Accordingly, it is also useful if the extensions are distributed evenly in the circumferential direction, i. H. in the case of preferably three extensions, these are offset by 120° relative to one another. This results in a compromise that is as skilful as possible between a maximum number of extensions required and adequate axial support of the hub body relative to the starting part.

In particular, the locking washer is arranged centered with respect to a radial direction via a centering surface on the output part.

In particular, the hub body covers a plurality of screws in the assembled state Exercises of the primary component along a radial direction, wherein the hub body is detachable from the torsional vibration damping device in the dismantled state and thus the screw connections are accessible.

If the hub body has a plurality of axially continuous second passages distributed in the circumferential direction as assembly aid holes, the assembly of the torsional vibration damping device on the crankshaft side is once again easily possible overall.

In other words, a demountable hub (hub body) is thus realized in a hybrid damper with a torque limiter (slipping clutch). The concept consists in particular of always ensuring that a torsional vibration damper (torsional vibration damping device), in particular in the form of a dual-mass flywheel, with a torque limiter, in particular a slipping clutch, can be dismantled. Even if the torque limiter was triggered by an impact and the passages in the hub body are no longer aligned along the axial direction with the crankshaft screw connections on the primary component, but are offset from one another in the circumferential direction, the torsional vibration damper can be removed because the mechanic always have direct access to the crankshaft screws (screws, screw connections). The Z. B. generated by an internal combustion engine torque is transmitted using the teeth on the hub shell of the torsional vibration damping device to a transmission input shaft. As a result of the arrangement of the locking washer, the hub body is arranged in a fixed position relative to the axial direction. A movement of the hub body in the direction of the gearbox is therefore not possible. The hub body is thus rigidly connected to the secondary component of the spring damper.

The use of indefinite articles (“a”, “an”, “an” and “an”), particularly in the claims and the description reflecting them, is to be understood as such and not as a numeral. Correspondingly introduced terms or components 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 sequence of these objects , sizes or processes to each other. Should a dependency and/or order be necessary, this is explicitly stated here or it is obvious to the 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.

• Es zeigen:
  • 1: eine erste Ausführungsvariante einer Drehschwingungsdämpfvorrichtung in einer Seitenansicht im Schnitt;
  • 2: einen Stift und eine Federklammer als Sicherungselement in einer perspektivischen Ansicht;
  • 3: eine zweite Ausführungsvariante einer Drehschwingungsdämpfvorrichtung in einer Seitenansicht im Schnitt; und
  • 4: einen Stift und einen Sicherungsstift als Sicherungselement in einer perspektivischen Ansicht.

The invention and the technical environment are explained in more detail below with reference to the attached figures. It should be pointed out that the invention should not 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 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 proportions shown are only schematic. Show it:

• Show it:
  • 1 : a first embodiment variant of a torsional vibration damping device in a side view in section;
  • 2 : a pin and a spring clip as a securing element in a perspective view;
  • 3 : a second embodiment variant of a torsional vibration damping device in a side view in section; and
  • 4 : a pin and a locking pin as a locking element in a perspective view.

1 shows a first embodiment of a torsional vibration damping device 1 in a side view in section. 2 shows a pin 15 and a spring clip as a securing element 14 in a perspective view. The 1 and 2 are described together below.

With 1 a torsional vibration damping device 1 is clearly visible in its general structure. The torsional vibration damping device 1 , with an axis of rotation 3 extending in an axial direction 2 , is realized in this embodiment as a so-called hybrid damper and has a spring damper 6 and a slipping clutch 8 . The torsional vibration damping device 1 is used in a preferred catchment area between an internal combustion engine and a transmission of a drive train of a motor vehicle.

The spring damper 6 has a primary component 4 and a secondary component 5 which is supported in a spring-damped manner relative to the primary component 4 . The primary component 4 is implemented in the manner of a housing. The primary component 4 has a flange which, during operation, is attached directly via a plurality of screw connections 24 to a crankshaft of the internal combustion engine, which is not shown here for the sake of clarity. For this purpose, the flange has first passages 25 through which the screw connections 24 or the screws protrude.

The primary component 4 encloses in a radial direction 23 radially outside of the screw connections 24 a receiving space 27 in which a plurality of damper springs 28 distributed in the circumferential direction 21 are arranged. The damper springs 28 are designed as arc springs. The damper springs 28 are inserted between the primary component 4 and the secondary component 5 in the circumferential direction 21 . The damper springs 28 are used for spring-elastic prestressing/supporting of the primary component 4 relative to the secondary component 5 in the circumferential direction 21. The primary component 4 can thus be rotated relative to the secondary component 5 over a limited angular range in a spring-damped manner. The spring damper 6 is thus realized according to the principle of a dual-mass flywheel.

The secondary component 5 is in 1 illustrated in particular on the part of its disc-shaped, radially within the damper springs 28 protruding friction section 29. That secondary component 5 is located in the radial direction 23 inside the damper springs 28, but outside the screw connections 24, with a slip clutch 8 in operative connection. The slipping clutch 8 serves as an impact protection and is in principle in a closed state. The slipping clutch 8 is typically designed in such a way that when a specific torque value to be transmitted is exceeded, in particular when a torque impact/torque pulse occurs, it opens briefly and thus performs a relative rotation between the secondary component 5 and a hub body 7 arranged on the output side.

The hub body 7 is used for the non-rotatable connection to a transmission shaft, which is also not shown here for the sake of clarity, preferably a transmission input shaft, of a transmission. For this purpose, the hub body 7 has in the radial direction 23 within the screw connections 24 a sleeve area 30 which, during operation, is non-rotatably connected to the transmission shaft via serrations arranged thereon.

From the sleeve area 30 , the hub body 7 extends outwards in a substantially disc-shaped manner in the radial direction 23 over the screw connections 24 . In the radial direction 23 outside of the screw connections 24 , the hub body 7 has external teeth 31 (pointing in the radial direction 23 ).

It should already be pointed out here that the hub body 7 forms a disc area 32 in the radial direction 23 between the sleeve area 30 and the area having the external teeth 31, with the disc area 32 being arranged directly with several distributed in the circumferential direction 21, in the axial direction 2 continuous second passages 26 is provided. The second passages 26 are present at the same angular distances and in the same number as the first passages 25 and are arranged in a targeted manner flush with the first passages 25 when the torsional vibration damping device 1 is mounted on the crankshaft for the first time. For this purpose, each second passage 26 has a larger internal diameter than the first passage. In particular, the second passage 26 is larger than a maximum diameter of the screw of the screw connection 24 (usually at the screw head).

In this context, however, it should also be pointed out that these second passages 26 can be dispensed with in further embodiments.

With regard to the slip clutch 8 it should also be pointed out that the secondary component 5 directly forms an input/an input part 33 of the slip clutch 8 . The input part 33 is clamped with the friction section 29 in the axial direction 2 between a first plate 34 and a second plate 35 and is in frictional contact with them. The second plate 35 is connected to the first plate 34 via a plurality of rivet elements 36 distributed in the circumferential direction.

The rivet elements 36 also serve to connect an essentially disc-shaped output part 10 of the slip clutch 8 to the second plate 35. The output part 10 essentially represents that component of an output side of the slip clutch 8 that has internal teeth 37 and these internal teeth 37 under training a form-fitting connection 9 is non-rotatably operatively connected to the external toothing 31 .

In a fully assembled state of the torsional vibration damping device 1 according to 1 is thus the hub body 7 in the axial direction 2 with inserted into the internal toothing 37 by means of its external toothing 31 and thereby fixed to the output part 10 in the direction of rotation via the form-fitting connection 9 .

The positive connection 9 is arranged along the axial direction 2 between the output part 10 and the locking washer 11 arranged coaxially to the axis of rotation 3 . In an assembled state (see 1 and 3 ) the lock washer 11 is firmly connected to the output part 10 with respect to the axial direction 2 . In a dismantled state (not shown), the locking washer 11 can be detached from the starting part 10 and thus enables the hub body 7 to be pulled out of the form-fitting connection 9 along the axial direction 2.

The lock washer 11 is disc-shaped and ring-shaped. The lock washer 11 is detachably attached to the output part 10 .

With such a locking washer 11, the hub body 7 can be released from the connection with the output part 10 in the event of maintenance using simple means and low disassembly forces, and the entire torsional vibration damping device 1 can then be quickly disassembled.

An extension 12 of the output part 10 extends along the axial direction 2 so far through an opening 13 in the locking washer 11 that a securing element 14 can be arranged on the extension 12, through which the locking washer 11 with the output part 10 is mounted opposite to the axial direction 2 is firmly connected.

The securing element 14 serves to fix the securing disk 11 in relation to the axial direction 2 on the extension 12 and thus on the output part 10 .

In the assembled state, the locking washer 11 is firmly connected to the output part 10 with respect to the axial direction 2 . In this state, the torsional vibration damping device 1 can be operated in a motor vehicle. In the dismantled state, the lock washer 11 can be detached from the output part 10 and can therefore be removed from the output part 10 . With the locking washer 11 removed, the hub body 7 can then be pulled out axially from the form-fitting connection 9 . In the dismantled state, the screw connections 24 between the primary component 4 and the crankshaft are accessible. In this way, these screw connections 24 can then be easily loosened and the torsional vibration damping device 1 can be dismantled from the drive train.

The extension 12 is formed by a pin 15 which extends along the axial direction 2 through a bore 16 in the output part 10 and through the opening 13 . The pin 15 has a head 17 which has a larger diameter than the bore 16, the pin 15 extending from the head 17 through the bore 16 and the opening 13. The head 17 and the securing element 14 fix the pin 15 in relation to the axial direction 2 on the components of the output part 10 and the securing disk 11 .

The securing element 14 is at least partially arranged in a circumferential groove 18 on the extension 12 . The securing element 14 is designed as a known spring clip that can be pushed onto the extension 12 . The spring clip 12 is elastically deformable. When pushed onto the pin 15, the spring clip is elastically deformed and thereby expanded. If the spring legs of the spring clip are slid over the diameter of the pin and the spring clip is arranged in the groove 18, the spring clip deforms back at least partially, so that an at least non-positive connection is formed between the spring clip and the extension 12 or pin 15.

The securing element 14 can be removed from the groove 18 in a direction perpendicular to the axis of rotation 3 in order to establish the disassembled state.

In the mounted state, the securing element 14 generates a pretension in relation to the axial direction 2 so that the securing disk 11 is supported on the securing element 14 and the hub body 7 is pressed against a contact surface 20 of the output part 10 . As a result, the hub body 7 is fixed with as little play as possible during normal operation of the torsional vibration damping device 1 .

The lock washer 11 is arranged centered on the output part 10 with respect to the radial direction 23 via a centering surface 22 .

In the assembled state, the hub body 7 covers a plurality of screw connections 24 of the primary component 4 along a radial direction 23, wherein in the disassembled state the hub body 7 can be detached from the torsional vibration damping device 1 and the screw connections 24 are therefore accessible.

3 shows a second embodiment variant of a torsional vibration damping device 1 in a side view in section. 4 shows a pin 15 and a locking pin as a locking element 14 in a perspective view. The 3 and 4 are described together below. To the remarks 1 and 2 is referenced.

In contrast to the first embodiment variant, the securing element 14 is designed as a known securing pin. This is arranged in the through hole 19 in the extension or in the pin 15 . The locking pin extends beyond the through hole 19 on both sides. The locking pin has an elastically deformable part that is located outside of the through hole 19 and extends along a peripheral surface of the extension 12 . When the locking pin is pushed into the through hole 19, this part outside of the through hole 19 is elastically deformed and widened in the process. As soon as the locking pin is arranged as intended in the through-hole 19, the deformed part deforms back at least partially, so that an at least non-positive connection is formed between the locking pin and the extension 12.

Reference List

1

torsional vibration damping device

2

axial direction

3

axis of rotation

4

primary ingredient

5

secondary ingredient

6

spring damper

7

hub body

8th

slip clutch

9

positive connection

10

output part

11

locking washer

12

extension

13

opening

14

fuse element

15

Pen

16

drilling

17

Head

18

groove

19

through hole

20

contact surface

21

circumferential direction

22

centering surface

23

radial direction

24

fittings

25

first pass

26

second passage

27

recording room

28

damper spring

29

rubbing section

30

sleeve area

31

external teeth

32

disk area

33

input part

34

first plate

35

second plate

36

rivet element

37

internal teeth

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited 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 assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102019120219 A1 [0002]
• DE 202020102864 U1 [0002]

Claims (10)

Torsional vibration damping device (1) for a drive train of a motor vehicle, with an axis of rotation (3) extending in an axial direction (2), a primary component (4) and a secondary component (5 ) spring damper (6), with a hub body (7) prepared for connection to a transmission shaft and with a slipping clutch (8) used to act between the secondary component (5) and the hub body (7), the hub body (7) having a positive connection (9) is non-rotatably connected to an output part (10) of the slipping clutch (8); wherein the positive connection (9) is arranged along the axial direction (2) between the output part (10) and a locking washer (11) arranged coaxially to the axis of rotation (3), wherein in an assembled state the locking washer (11) is connected to the output part (10) is fixed relative to the axial direction (2); the locking washer (11) being detachable from the starting part (10) in a dismantled state, thus enabling the hub body (7) to be pulled out axially from the form-fitting connection (9). Torsional vibration damping device (1). claim 1 wherein an extension (12) of the output part (10) along the axial direction (2) extends so far through an opening (13) in the locking washer (11) that a securing element (14) can be arranged on the extension (12). , through which the lock washer (11) is firmly connected to the output part (10) with respect to the axial direction (2) in the assembled state. Torsional vibration damping device (1). claim 2 wherein the extension (12) is formed by a pin (15) which extends along the axial direction (2) through a bore (16) of the output part (10) and through the opening (13). Torsional vibration damping device (1). claim 3 , wherein the pin (15) has a head (17) which has a larger diameter than the bore (16), the pin (15) starting from the head (17) through the bore (16) and the opening ( 13) extends. Torsional vibration damping device (1) according to one of claims 2 until 4 , The securing element (14) being arranged at least partially in a circumferential groove (18) on the extension (12) or in a through hole (19) in the extension (12). Torsional vibration damping device (1) according to one of the preceding claims 2 until 5 , wherein the securing element (14) can be removed from the groove (18) or the through hole (19) in a direction perpendicular to the axis of rotation (3) in order to produce the disassembled state. Torsional vibration damping device (1) according to one of claims 2 until 6 , wherein the securing element (14) in the assembled state generates a preload in relation to the axial direction (2), so that the securing disc (11) is supported on the securing element (14) and the hub body (7) against a contact surface (20) of the output part (10) presses. Torsional vibration damping device (1) according to one of claims 2 until 7 , wherein a plurality of extensions (12) distributed in a circumferential direction (21) are provided. Torsional vibration damping device (1) according to one of the preceding claims, wherein the locking washer (11) is arranged centered on the output part (10) with respect to a radial direction (23) via a centering surface (22). Torsional vibration damping device (1) according to one of the preceding claims, wherein the hub body (7) in the assembled state covers a plurality of screw connections (24) of the primary component (4) along a radial direction (23), wherein in the dismantled state the hub body (7) of the torsional vibration damping device (1) is detachable and thus the screw connections (24) are accessible.

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