DE102021128226A1 - Torsional vibration damper with a preloaded, releasable toothed engagement - Google Patents

Abstract

The invention relates to a torsional vibration damper (10) for transmitting a torque and reducing torsional vibrations, having a first damper component (16) which can be rotated about an axis of rotation (14), at least one spring element (30), a spring element (30) which counteracts the action of the first damper component (16), rotatable second damper component (34), a torque limiter (40) for automatically limiting the maximum transmissible torque, with a torque limiter input (42) and a torque limiter output (46) frictionally connected thereto via a friction area (44), an output element (66) for dissipating the torque transmitted by the torque limiter (40), a first output component (52) arranged effectively between the friction area (44) and the output element (66) and a second output component ( 64), a pretensioning element (74) tensioning the toothing engagement (62) with a radial pretensioning force (76), the pretensioning element (74) being secured axially on the first driven component (52) and accommodated in a radially displaceable manner and in one of the pretensioning elements (74) radially opposite and as a radial recess (78) designed receptacle (80) in the second driven component (64) via the radial biasing force (76) effectively engages.

Description

The invention relates to a torsional vibration damper according to the preamble of claim 1.

A torsional vibration damper, for example, is off DE 10 2020 101 971 A1 known. A torsional vibration damper with a damper input part that can be rotated about an axis of rotation is described therein. A damper output part, which can be twisted to a limited extent about the axis of rotation against the action of a spring element, is connected to a torque limiter which is arranged in series with the spring element and which limits the maximum transmission torque. The torque limiter is connected to an output element via a gearing.

In order to be able to detach the torsional vibration damper from an internal combustion engine, access to the screws connecting it to the internal combustion engine is required. If the torque limiter was triggered during operation of the torsional vibration damper, i.e. the torque limiter input was twisted in relation to the torque limiter output, twisting may have occurred between the output element and the damper input part, as a result of which the screws can be covered by the output element and are inaccessible from a side of the output element that is axially opposite to the internal combustion engine could be.

The torsional vibration damper therefore has a toothed engagement between the torque limiter output and the output element, tensioned by a preload element, which is axially decoupled against the radial preload force exerted by the preload element, and the output element can then be rotated in relation to the torque limiter output and thus also in relation to the damper input part in order to loosen the screws for Being able to remove the torsional vibration damper from the internal combustion engine.

The object of the present invention is to be able to construct the torsional vibration damper more cost-effectively and simply and to be able to remove it more easily and in a time-saving manner.

At least one of these objects is solved by a torsional vibration damper having the features of claim 1. As a result, the axial securing of the toothing engagement can be carried out more reliably. The first and second output component can be better secured axially to each other. The torsional vibration damper can be released more easily and simply.

The torsional vibration damper can be arranged in a vehicle, in particular in a drive train of the vehicle. The powertrain may be a hybrid powertrain. The torsional vibrations in the drive train can be caused by a drive element. The drive element can be designed as an internal combustion engine.

The torsional vibration damper can be assigned to a torque transmission device, for example a clutch, in particular a wet or dry double clutch or starting clutch or a torque converter or a hybrid module, in particular with a KO clutch. The torsional vibration damper can be effectively located in front of the torque transfer device. The torsional vibration damper can be arranged within the torque transmission device.

The first damper component can be designed as a damper input part. The second damper component can be designed as a damper output part.

The torsional vibration damper can be designed as a dual-mass flywheel. The damper input part can have a primary centrifugal mass, in particular also a cover element firmly connected thereto. The damper output part can be designed as a bow spring flange.

The torsional vibration damper can be detachably fastened to a connecting element by at least one connecting element, in particular a screw, guided through the damper input part. The connection element can be assigned to the drive element. The connecting element can be a crankshaft of the internal combustion engine. Several connecting elements can be arranged on the circumference. The torsional vibration damper can be detachably fastened to the connecting element via the connecting element through the damper input part.

The connecting element can be accessible via a through opening that can be aligned coaxially thereto, starting from a side facing away from the drive element. The through opening can be arranged in the second damper component, the damper output part, the second driven component or the driven element. The connecting element and the through-opening can be aligned coaxially with one another by twisting the component having the through-opening relative to the damper input part.

The connecting element can be detachable using a detachment tool. The detachment tool can be guided through the through-opening towards the connecting element.

The spring element can be an arc spring. The spring element can be supported radially on the damper input part via a sliding cup. Several spring elements can be arranged on the circumference.

The spring element can be arranged in a housing interior. The housing interior can be filled with a lubricant. The lubricant can be a lubricating oil or a lubricating grease.

The torsional vibration damper can have a centrifugal pendulum. The centrifugal pendulum can be effectively arranged before or after the spring element. The centrifugal pendulum can have at least one pendulum mass that can be deflected to a limited extent along a pendulum track relative to a pendulum mass carrier. The centrifugal pendulum can be designed as an encapsulated centrifugal pendulum. The centrifugal pendulum can be designed as an internal centrifugal pendulum. The pendulum masses can be arranged inside or outside of the housing interior. The pendulum mass carrier can be connected to the damper output part and/or the driven element in a positive, non-positive and/or material connection.

The torque limiter can be located inside or outside of the housing interior. The torque limiter can be designed to run dry. The torque limiter can be operatively arranged in series with the spring element. The torque limiter can be effectively arranged after the spring element with respect to the transmission of the torque.

The torque limiter input can be positively, non-positively and/or materially connected to the damper output part, in particular it can be made in one piece. The torque limiter output can have a first support disk and a second support disk arranged at an axial distance therefrom. The torque limiter input may be located axially between the first and second support washers. The torque limiter output can be radially centered on the damper input part, preferably via a centering disc.

The friction area is preferably designed to automatically cause a rotation between the torque limiter input and the torque limiter output when the maximum transmission torque is exceeded, thereby limiting the transmission torque. When the maximum transmission torque is exceeded, the frictional connection through the friction area can be automatically at least partially canceled and limited to the transmission of the maximum transmission torque. The friction area can have at least one friction lining. The friction lining can be arranged at the torque limiter output or the torque limiter input.

The output element can be designed as an output hub. The output element can be toothed connected to an output shaft.

The first output component can be permanently connected to the torque limiter output, preferably made in one piece. The second output component can be firmly connected to the output element, preferably in one piece. The first driven component can be firmly connected to the driven element, preferably designed in one piece. The second output component can be permanently connected to the torque limiter output, preferably designed in one piece.

The prestressing element can be made of metal, in particular steel and/or plastic. The pretensioning element can be secured axially and/or radially in a guide sleeve. The guide sleeve can accommodate the spring element and, together with the pretensioning element, can be axially secured and radially displaceable within the first driven component.

Torque transmission between the pretensioning element and the receptacle and thus between the first and second driven element via the pretensioning element can be omitted.

In a preferred embodiment of the invention, it is advantageous if the prestressing element is prestressed with the radial prestressing force via a spring element accommodated on the first driven component. The spring element can be aligned radially. The spring element can be accommodated in a radial recess in the first driven component. The spring element can be designed as a helical spring. The spring element can act directly on the prestressing element. The spring force can be dimensioned in such a way that the radial prestressing force is not impaired by the centrifugal acceleration.

A preferred embodiment of the invention is advantageous in which the prestressing element is spherical. As a result, the prestressing element can be designed more cost-effectively. The prestressing element can be designed as a ball. The recording can of the outer contour Ball be adjusted. The receptacle can be hemispherical.

In a preferred embodiment of the invention, it is advantageous if the radial indentation is adapted to the outer contour of the pretensioning element. The radial indentation can be hemispherical.

In a preferred embodiment of the invention, it is advantageous if at least two pretensioning elements are offset from one another on the circumferential side. The pretensioning elements can be offset from one another by 90°, 120° or 180° on the circumferential side. The respective prestressing element can be subjected to the radial prestressing force by a spring element assigned to it.

In a specific embodiment of the invention, it is advantageous if the toothing engagement is built up by a first toothing in the first output component and a complementary second toothing in the second output component. The pretensioning element can be arranged between two circumferentially adjacent teeth of the first and/or second toothing. At least one toothing can be broached. At least one toothing can be produced off the tool by a stamping process, rolled and/or machined. The first toothing can be designed as an external toothing or an internal toothing. The second toothing can be configured as an external toothing or an internal toothing.

In a preferred embodiment of the invention, it is advantageous if the receptacle is arranged at a circumferential position of the second toothing which, according to the toothing pitch of the second toothing, corresponds to a circumferential position of a tooth of the second toothing omitted for this purpose. The prestressing element can be arranged circumferentially between two adjacent teeth of the first toothing.

In a preferred embodiment of the invention, it is advantageous if a peripheral extent of the pretensioning element is limited to the area between two teeth of the second toothing. A peripheral extent of the pretensioning element can also be limited to the area between two teeth of the first toothing. The pretensioning element can be arranged radially overlapping, radially inside or radially outside of an addendum circle of the second toothing. The pretensioning element can be arranged radially overlapping, radially inside or radially outside of an addendum circle of the first toothing. The pretensioning element can be arranged radially outside of a root circle of the second toothing.

In a special embodiment of the invention, it is advantageous if the pretensioning element is arranged so that it overlaps axially with respect to the first and/or second toothing. An axial width of the receptacle can be smaller than an axial width of the second toothing.

A preferred embodiment of the invention is advantageous in which the toothing engagement can be released axially by an axial force that is greater than a minimum axial force, with the minimum axial force being dependent on the radial prestressing force. The minimum axial force can be greater than the axial forces acting on the meshing of the teeth during operation of the torsional vibration damper. The minimum axial force can be so small that it can be provided manually, if necessary with a detachment tool.

Further advantages and advantageous configurations of the invention result from the description of the figures and the illustrations.

character list

• 1: Einen Halbschnitt eines Drehschwingungsdämpfers in einer speziellen Ausführungsform der Erfindung.
• 2: Den Ausschnitt A aus 1 in einer vergrößerten Ansicht.
• 3: Eine Seitenansicht des Abtriebselements aus 1.

The invention is described in detail below with reference to the figures. They show in detail:

• 1 : A half-section of a torsional vibration damper in a special embodiment of the invention.
• 2 : Cut out A 1 in an enlarged view.
• 3 : A side view of the output member 1 .

1 shows a half section of a torsional vibration damper in a special embodiment of the invention. The torsional vibration damper 10 is arranged in a drive train of a vehicle to transmit a torque and to reduce torsional vibrations of a drive element, preferably an internal combustion engine. The torsional vibration damper 10 is designed as a dual-mass flywheel 12 and has a first damper component 16 which can be rotated about an axis of rotation 14 and is designed as a damper input part 18 .

The damper input part 18 comprises a primary centrifugal mass 20 and a cover element 22 firmly connected thereto. The damper input part 18 is firmly connected to a connecting element 26 of the internal combustion engine via connecting elements 24, here screws. The damper input part 18 delimits a housing interior 28 in which a plurality of spring elements 30, here arc springs, which are spaced apart from one another on the circumferential side, are introduced. The spring elements 30 support zen radially from a sliding shell 32 from. The housing interior 28 can be filled with a lubricant, for example a lubricating oil or a lubricating grease.

A second damper component 34, here a damper output part 36, can be twisted to a limited extent relative to the damper input part 18 via the action of the spring elements 30. The damper output part 36 can also be rotated about the axis of rotation 14 and is arranged concentrically to the damper input part 18 . The damper output part 36 is radially centered with respect to the damper input part 18 via a centering disk 38 which is connected to the damper input part 18 by the connecting elements 24 .

A torque limiter 40 is effectively connected downstream of the spring elements 30 . The torque limiter 40 includes a torque limiter input 42, which is designed here in one piece with the damper output part 36, and a torque limiter output 46 which is frictionally connected thereto via a friction area 44. The torque limiter 40 is arranged inside the housing interior 28.

The torque limiter output 46 has a first support disk 48 and a second support disk 50 arranged at an axial distance therefrom. The torque limiter input 42 is located axially between the first and second support washers 48,50. The friction area 44 preferably includes a friction lining operatively disposed between the first support disk 48 and the torque limiter input 42 and/or the second support disk 50 and the torque limiter input 42 .

The friction area 44 is designed to automatically cause a rotation between the torque limiter input 42 and the torque limiter output 46 when the maximum transmission torque is exceeded and thereby to limit the transmission torque via the torque limiter 40 . As a result, the spring elements 30 and the components of the torsional vibration damper 10 can be protected from excessive torques and torque surges.

The torque limiter output 46 is firmly connected to a first output component 52 via a number of rivet elements 54 . A shim 56 is disposed axially between the torque limiter output 46 and the first output component 52 and is secured to the torque limiter output 46 and the first output component 52 via the rivet elements 54 . Furthermore, a disk spring membrane 58 is fastened via the rivet elements 54 , which rests against the cover element 22 in an axially braced and rotatable manner via a friction ring 60 .

The first output component 52 is connected in a torque-transmittable manner to a second output component 64 via an axially releasable toothing engagement 62 . The second output component 64 is designed in one piece with an output element 66 for discharging the torque transmitted by the torque limiter 40 . The output element 66 is designed as an output hub 68 . The output element 66 can have internal teeth 70 for connection to an output shaft.

The output element 66 has passage openings 72 which are arranged coaxially to the connecting elements 24 and through which the connecting elements 24 can be passed axially when the torsional vibration damper 10 is fastened to the connecting element 26 . When torsional vibration damper 10 is in operation and torque limiter 40 is triggered, as a result of which torque limiter output 46 is rotated relative to torque limiter input 42 and thus output element 66 is rotated relative to damper input part 18 via friction region 44, connecting elements 24 and through-openings 72 may be rotated relative to one another on the circumferential side and the coaxial alignment is canceled. As a result, the connecting elements 24 can be inaccessible via the through-openings 72 and the output element 66 must be rotated relative to the damper input part 18 until the connecting elements 24 and the through-openings 72 are arranged coaxially with one another again.

The amount of torque required for this should be limited as far as possible and the torsional vibration damper 10 should be able to be detached from the connecting element 26 simply and easily. For this purpose, toothing engagement 62 is designed to be axially releasable, and by axially displacing output element 66 relative to first output component 52, the torque-transmittable toothing can be released axially, and then output element 66 can be rotated relative to first output component 52 until through-openings 72 are coaxial with connecting elements 24 are aligned.

It should be possible to apply the axial force required for the axial displacement of the drive element by hand, if necessary using a detachment tool. On the other hand, the toothing engagement 62 should be secured axially when the torsional vibration damper 10 is in operation and a mutual axial movement of the output element 66 and the first output component 52 should be prevented.

For this reason, the toothing engagement 62 is clamped with a prestressing element 74, which builds up a radial prestressing force 76 between the first and second driven component 52, 64. The pretensioning element 74 is secured axially on the first output component 52 and accommodated in a radially displaceable manner and is arranged in a receptacle 80 radially opposite the pretensioning element 74 and designed as a radial depression 78 in the second output component 64 pretensioned by the radial pretensioning force 76. As a result, the toothing engagement 62 can be secured axially when the torsional vibration damper 10 is in operation and can be released axially to release the torsional vibration damper 10 from the connection element 26 .

2 shows section A 1 in an enlarged view. The prestressing element 74 has a spherical design and is prestressed with the radial prestressing force 76 by a spring element 82 accommodated on the first driven component 52 . The radial indentation 78 directly opposite the prestressing element 74 is adapted to the outer contour of the prestressing element 74 and has a hemispherical design. As a result, the prestressing element 74 can convert the radial prestressing force 76 into a reliable axial securing of the toothing engagement 62 .

The prestressing element 74 is secured in a guide sleeve 84 which accommodates the spring element 82 and which is axially secured together with the prestressing element 74 within the first output component 52 and is radially displaceable. The spline engagement 62 is established by a first spline 86 in the first output member 52 and a complementary second spline 88 in the second output member 64, with the biasing member 74 disposed between two circumferentially adjacent teeth 90 of the first and second splines 86,88. The first toothing 86 is designed as an internal toothing 92 and the second toothing 88 is designed as an external toothing 94 . The pretensioning element 74 is arranged in an axially overlapping manner with respect to the first and second teeth 86 , 88 .

3 shows a side view of the driven element 1 . The output element 66 is designed in one piece with the second output component 64 and has the second toothing 88 , which is designed as an external toothing 94 and has a plurality of teeth 90 in a predetermined toothing pitch 96 on the outer circumference. The receptacle 80 designed as a radial depression 78 is arranged at a circumferential position of the second toothing 88 which, corresponding to the toothing pitch 96 of the second toothing 88, is a circumferential position of a tooth of the second omitted for this purpose

Toothing 88 corresponds. A total of three prestressing elements and corresponding receptacles 80 are arranged offset from one another by 120°. Among other things, the required axial securing of the toothing engagement can be adjusted by the number of prestressing elements.

Reference List

10

torsional vibration damper

12

dual mass flywheel

14

axis of rotation

16

first damper component

18

damper input part

20

primary flywheel

22

cover element

24

fastener

26

connection element

28

housing interior

30

spring element

32

sliding shell

34

second damper component

36

damper output part

38

centering disc

40

torque limiter

42

torque limiter input

44

friction area

46

Torque limiter output

48

first support disc

50

second support disc

52

first output component

54

rivet element

56

spacer

58

disc spring membrane

60

friction ring

62

gear engagement

64

second output component

66

output element

68

output hub

70

internal teeth

72

passage openings

74

biasing element

76

radial preload force

78

radial indentation

80

Recording

82

spring element

84

guide sleeve

86

first gearing

88

second toothing

90

Tooth

92

internal teeth

94

external teeth

96

teeth pitch

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 102020101971 A1 [0002]

Claims (10)

Torsional vibration damper (10) for transmitting a torque and reducing torsional vibrations, having a first damper component (16) which can be rotated about an axis of rotation (14), at least one spring element (30), a spring element (30) which counteracts the action of the spring element (30) relative to the first damper component (16 ) limited rotatable second damper component (34), a torque limiter (40) for automatically limiting the maximum transferable torque, with a torque limiter input (42) and a torque limiter output (46) frictionally connected thereto via a friction area (44), an output element (66) for dissipation of the torque transmitted by the torque limiter (40), a first output component (52) arranged effectively between the friction area (44) and the output element (66) and a second output component (64) connected thereto in a torque-transmittable manner via an axially releasable toothing engagement (62). pretensioning element (74) tensioning the toothing engagement (62) with a radial pretensioning force (76), characterized in that the pretensioning element (74) is secured axially on the first driven component (52) and is accommodated in a radially displaceable manner and in one of the pretensioning element (74) radially opposing and as a radial recess (78) designed receptacle (80) in the second driven component (64) via the radial biasing force (76) effectively engages. Torsional vibration damper (10). claim 1 , characterized in that the prestressing element (74) is prestressed with the radial prestressing force (76) via a spring element (82) accommodated on the first driven component (52). Torsional vibration damper (10). claim 1 or 2 , characterized in that the biasing element (74) is spherical. Torsional vibration damper (10) according to one of the preceding claims, characterized in that the radial depression (78) is adapted to the outer contour of the prestressing element (74). Torsional vibration damper (10) according to one of the preceding claims, characterized in that at least two prestressing elements (74) are arranged offset relative to one another on the circumferential side. Torsional vibration damper (10) according to one of the preceding claims, characterized in that the toothing engagement (62) is constructed by a first toothing (86) in the first output component (52) and a complementary second toothing (88) in the second output component (64). . Torsional vibration damper (10). claim 6 , characterized in that the receptacle (80) is arranged at a circumferential position of the second toothing (88) corresponding to the toothing pitch (96) of the second toothing (88) a circumferential position of a tooth (90) of the second toothing (88) omitted for this purpose. is equivalent to. Torsional vibration damper (10). claim 6 or 7 , characterized in that a circumferential extent of the prestressing element (74) is limited to the area between two teeth (90) of the second toothing (88). Torsional vibration damper (10) according to one of Claims 6 until 8th , characterized in that the pretensioning element (74) is arranged so that it overlaps axially with respect to the first and/or second toothing (86, 88). Torsional vibration damper (10) according to one of the preceding claims, characterized in that the toothing engagement (62) can be released axially by an axial force greater than a minimum axial force, the minimum axial force being dependent on the radial prestressing force (76).

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