Torsional vibration damper with axial spring element and friction element

Abstract

The invention relates to a torsional vibration damper for reducing torsional vibration. The invention relates to a damper assembly, comprising a first damper element that can be rotated about an axis of rotation, at least one spring element, and a second damper element that can be rotated about the axis of rotation and that can be rotated to a limited extent relative to the first damper element against the action of the spring element, a driven component which is coupled to the second damper element in a rotationally fixed manner and which guides the torque transmitted via the spring element and the second damper element, and a friction element which is arranged in a frictionally active manner between the first damper element and the second damper element, and an axial spring element which is fixed to the second damper element and applies an axial force to the friction element, the first damper element having a cover element, the friction element being frictionally torsionable relative to the first damper element so as to form a friction region and being directly, rotationally fixed, form-fittingly connected to the output component.

Description

Technical Field

[0001] The invention relates to a torsional vibration damper according to the preamble of claim 1 . Background Art

[0002] DE 10 2018 130 872 A1 describes a torsional vibration damper having an input part and an output part, which can rotate together about an axis of rotation and can be twisted relative to each other in a limited manner. An arc spring, a friction ring and a disc spring diaphragm act between the input part and the output part.

[0003] DE 10 2012 202 255 A1 describes a dual mass flywheel having a primary part, a plurality of arc springs and a secondary part. The secondary part comprises a flange, which is connected to a sleeve via a two-part disk assembly. A friction device comprising a friction lining establishes a frictional relative rotation between the disk assembly and the cover of the primary part. Summary of the invention

[0004] The object of the invention is to set the friction between the first damper element and the second damper element more precisely. The friction should remain constant. The components of the torsional vibration damper should be designed to be more reliable. The torsional vibration damper should be designed to be more cost-effective and space-saving.

[0005] At least one of the objects is achieved by a torsional vibration damper having the features according to claim 1. As a result, the friction between the first damper element and the second damper element can be set more precisely. The friction can be kept constant.

[0006] The torsional vibration damper can be arranged in a vehicle. The torsional vibration damper can be arranged in a drive train of a vehicle. The torsional vibration damper can be arranged in an efficient manner between a drive element, in particular an internal combustion engine, and a driven element, in particular a transmission.

[0007] The torsional vibration damper can be designed to run wet or dry. The torsional vibration damper can have a damper interior space, in which the spring element is arranged. The damper interior space can be at least partially filled with a lubricant, in particular a grease.

[0008] The first damper element can be a damper input element and the second damper element can be a damper output element.

[0009] The torsional vibration damper can have a plurality of spring elements. The spring elements can be arranged distributed on the circumference. The spring elements can be compression springs or arc springs.

[0010] The axial spring element can be designed as a spiral spring or a spiral spring membrane.

[0011] The friction element can be implemented as a friction ring. The friction element can be made of a material different from the axial spring element and / or the first damper element. The friction element can be made of plastic. The direct form-fit connection between the friction element and the axial spring element can be eliminated. The friction element can be fixed axially between the axial spring element and the first damper element by the axial force of the axial spring element. The friction element can be moved axially to the maximum extent against the axial force of the axial spring element. The friction element can be permanently in contact with the first damper element in the axial direction. The friction element can cause a basic hysteresis between the first damper element and the second damper element. The friction element can be directly frictionally in contact with the first damper element in a rotatable manner. The friction element can be arranged axially between the axial spring element and the first damper element.

[0012] The driven member can be a sheet member. The driven member can be a driven sleeve. The driven member can be connected to a coupling member, such as a transmission input shaft. The driven member and the coupling member can be connected to each other in a form-fitting manner. The driven member can have a coupling tooth portion for connecting to the coupling member in a torque-transmitting manner.

[0013] The driven component can be connected to the second damper element in a form-fitting, force-fitting and / or materially connected manner. The driven component can be connected to the second damper element by at least one rivet element.

[0014] In a preferred embodiment of the invention, it is advantageous that the axial spring element applies an axial force to the friction element in the direction of the first damper element. The friction element can be arranged between the axial spring element and the first damper element in an axially acting manner. The direct contact of the axial spring element on the first damper element can be omitted.

[0015] In a preferred embodiment of the invention, it is advantageous if the axial spring element can be twisted frictionally relative to the first damper element with the friction element interposed therebetween. The axial spring element can be connected to the friction element in a rotationally fixed manner by a torsionally fixed form fit connection of the friction element and the driven component, by a torsionally fixed coupling of the driven component to the second damper element, and by the fixing of the axial spring element to the second damper element. The axial spring element and the friction element are connected to each other in a rotationally fixed manner by this indirect connection.

[0016] In an advantageous embodiment of the invention, the axial spring element bears against the coupling region of the friction element in order to transmit the axial force to the friction element, thereby making it possible to clamp the friction region with the axial force.

[0017] In a preferred embodiment of the present invention, the friction region comprises a friction surface on the friction element, which is arranged axially opposite the coupling region. The friction surface and the coupling region can be arranged overlapping in the radial direction.

[0018] In a special embodiment of the invention, it is advantageous if the friction surface is arranged on the axial side of the friction element facing the cover element. The first damper element, in particular the cover element, can have a counter friction surface frictionally coupled to the friction surface. The friction surface and the counter friction surface can form a friction region.

[0019] In a preferred embodiment of the invention, the friction element has at least one first form-fitting connection element, which is connected in a form-fitting manner to a second form-fitting connection element on the driven component. The first form-fitting connection element can extend radially inwardly of the cover element. The first form-fitting connection element can be arranged at least partially axially overlapping with the cover element. The first form-fitting connection element is preferably embodied as a projection that is limited on the circumferential side.

[0020] In an advantageous embodiment of the invention, the second form-fitting connection element is implemented as a circumferential recess in the driven component. The second form-fitting connection element can be implemented on the outer circumference of the driven component. The outer circumference can be arranged radially inside the cover element. The second form-fitting connection element can be arranged axially overlapping with the cover element. The outer circumference can be arranged axially at least partially overlapping with the cover element.

[0021] In a special embodiment of the invention, it is advantageous if the friction element has a radial section from which the first form-fitting element extends axially away. The first form-fitting element can extend from the radial section essentially in the axial direction. The first form-fitting element can extend radially inwardly of the radial section.

[0022] A preferred embodiment of the invention is advantageous in which the torsional vibration damper is a dual mass flywheel, the first damper element comprises a primary flywheel and a cover element, and the friction element is frictionally rotatable relative to the cover element to form a friction region.

[0023] Further advantages and advantageous embodiments of the invention are apparent from the description of the figures and from the single drawing.

[0024] Further advantages and advantageous embodiments of the invention are apparent from the description of the drawings and from the several figures. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0026] Figure 1A half-section view of a torsional vibration damper according to a special embodiment of the invention is shown.

[0027] Figure 2 Shows Figure 1 A section of a torsional vibration damper. DETAILED DESCRIPTION

[0028] Figure 1 A half-section view of a torsional vibration damper of a special embodiment of the present invention is shown. The torsional vibration damper 10 is arranged between a drive element (e.g. an internal combustion engine) and a driven element (e.g. a transmission) to reduce torsional vibrations and is designed as a dual mass flywheel 12. The torsional vibration damper 10 comprises a first damper element 16 that can rotate about an axis of rotation 14, the first damper element 16 comprising a primary flywheel 18 and a cover element 20 fixedly connected thereto. The first damper element 16 delimits a damper interior 22, in which a plurality of spring elements 24, preferably arc springs 26, are accommodated.

[0029] The second damper element 28 is rotatable about the rotation axis 14 and is limited in rotation relative to the first damper element 16 against the action of the spring element 24. The second damper element 28 comprises an arc-shaped spring flange 30 directly coupled to the spring element 24 in a force-transmitting manner and a torque limiter 32 for limiting the maximum transmitted torque.

[0030] The torque limiter 32 comprises a torque limiter input 34 which is integrally formed with the arc spring flange 30 and a torque limiter output 36 which is frictionally connected to the torque limiter input 34 in a prestressed manner. The torque limiter output 36 comprises a first disk component 38 and a second disk component 40 which is spaced apart therefrom in the axial direction. The torque limiter input 34 is accommodated axially between the first disk component 38 and the second disk component 40. The first disk component 38 and the second disk component 40 are fixedly connected to each other via at least one rivet element 42 and to a driven component 44 which conducts the torque transmitted via the spring element 24, the second damper element 28 and the torque limiter 32 from the torsional vibration damper 10. The driven component 44 has a coupling toothing 46 radially inside for positive connection with a coupling component, for example a transmission input shaft. The driven component 44 is coupled to the second damper element 28 in a rotationally fixed manner via the rivet element 42.

[0031] The axial spring element 48 is fixedly connected to the second damper element 28 and the driven component 44 via the rivet element 42. The axial spring element 48 acts on the friction element 50 with an axial force 52, which acts in the direction of the cover element 20. The friction element 50 acts frictionally between the first damper element 16 and the second damper element 28 and is designed as a friction ring 54, which can be twisted frictionally relative to the first damper element 16, thereby forming a friction area 56.

[0032] The axial spring element 48 is designed as a spiral spring membrane 58, which bears against the coupling region 60 of the radial section 62 of the friction element 50 in a force-loaded manner. The axial spring element 48 can be twisted relative to the first damper element 16 in a friction-acting manner via the intermediate friction element 50. The axial force 52 exerted by the axial spring element 48 is directed in the direction of the first damper element 16. The friction element 50 is arranged between the axial spring element 48 and the first damper element 16 (here the cover element 20) in an axial force-acting manner.

[0033] Figure 2 Shows Figure 1 A friction surface 64 is arranged on the axial side of the friction element 50 axially opposite the coupling region 60 , which friction surface is frictionally coupled to a counter friction surface 66 of the cover element 20 .

[0034] The friction element 50 is directly connected to the driven component 44 in a form-fitting manner so as to be non-rotatable relative to each other. For this purpose, the first form-fitting connection element 68 of the friction element 50 is connected in a form-fitting manner to the second form-fitting connection element 70 on the driven component 44. The first form-fitting connection element 68 extends radially inwardly of the cover element 20. The second form-fitting connection element 70 is designed as a circumferential recess 72 in the driven component 44. The circumferential recess 72 is implemented on the outer circumference 74 of the driven component 44 and is arranged radially inwardly of the cover element 20 and overlaps with the cover element 20 in the axial direction.

[0035] The first form-fitting element 68 extends, starting from the radial section 62, radially inside the cover element 20 and running predominantly in the axial direction. The first form-fitting element 68 is preferably designed as a circumferentially delimited projection 76 .

[0036] The axial spring element 48 is connected to the friction element 50 via a rotationally fixed form fit connection between the friction element 50 and the driven component 44, a rotationally fixed coupling between the driven component 44 and the second damper element 28, and the fixing of the axial spring element 48 to the second damper element 28. The axial spring element 48 and the friction element 50 are rotationally fixed to each other via this indirect connection.

[0037] Reference numerals list

[0038] 10 Torsional vibration damper

[0039] 12 Dual mass flywheel

[0040] 14 Axis of rotation

[0041] 16 First damper element

[0042] 18 Primary Flywheel

[0043] 20 Cover element

[0044] 22 Internal space of shock absorber

[0045] 24 Spring element

[0046] 26 Arc Spring

[0047] 28 Second damper element

[0048] 30 Arc Spring Flange

[0049] 32 Torque limiter

[0050] 34 Torque limiter input

[0051] 36 Torque limiter output

[0052] 38 First disc component

[0053] 40 Second disc assembly

[0054] 42 Riveting elements

[0055] 44 Follower

[0056] 46 Coupling teeth

[0057] 48 Axial spring element

[0058] 50 Friction element

[0059] 52 Axial force

[0060] 54 Friction ring

[0061] 56 Friction Area

[0062] 58 disc spring diaphragm

[0063] 60 Coupling area

[0064] 62 radial segments

[0065] 64 Friction surface

[0066] 66 Mating friction surface

[0067] 68 first form-fitting connection element

[0068] 70 Second form-fit connection element

[0069] 72 Circumferential concave portion

[0070] 74 outer circumference

[0071] 76 protrusion

Claims

1. A torsional vibration damper (10) for reducing torsional vibration, the torsional vibration damper comprising: a first damper element (16) which is rotatable about an axis of rotation (14), the first damper element having a cover element (20), at least one spring element (24), a second damper element (28) which is rotatable about the rotation axis (14) and which is twistable relative to the first damper element (16) in a limited manner against the action of the spring element (24), an output component (44) connected in a rotationally fixed manner to the second damper element (28), the output component (44) dissipating a torque transmitted via the spring element (24) and the second damper element (28), a friction element (50) having a friction effect between the first damper element (16) and the second damper element (28), an axial spring element (48) which is fixed to the second damper element (28) and which applies an axial force (52) to the friction element (50), It is characterized in that The friction element (50) is rotatable relative to the first damper element (16) in a frictionally effective manner to form a friction region (56), and the friction element (50) is directly connected to the output component (44) in a rotationally fixed manner with a positive fit.

2. The torsional vibration damper (10) according to claim 1, characterized in that The axial spring element (48) exerts the axial force (52) on the friction element (50) in the direction of the first damper element (16).

3. The torsional vibration damper (10) according to claim 1 or 2, characterized in that: The axial spring element (48) is rotatable relative to the first damper element (16) in a frictionally effective manner with the friction element (50) interposed therebetween.

4. The torsional vibration damper (10) according to any one of the preceding claims, characterized in that The axial spring element (48) bears against a coupling region (60) of the friction element (50) in order to transmit the axial force (52) to the friction element (50).

5. The torsional vibration damper (10) according to claim 4, characterized in that The friction region (56) comprises a friction surface (64) on the friction element (50), which is arranged axially opposite the coupling region (60).

6. The torsional vibration damper (10) according to claim 5, characterized in that The friction surface (64) is arranged on an axial side of the friction element (50) facing the cover element (20).

7. Torsional vibration damper (10) according to any of the preceding claims or according to the preamble of claim 1, characterized in that The friction element (50) has at least one first form-fitting connection element (68), which is form-fittingly connected to a second form-fitting connection element (70) on the driven component (44), wherein the first form-fitting connection element (68) extends radially inwardly of the cover element (20).

8. The torsional vibration damper (10) according to claim 7, characterized in that The second form-fitting connection element (70) is a circumferential recess (72) in the driven member (44).

9. The torsional vibration damper (10) according to claim 7 or 8, characterized in that The friction element (50) has a radial section (62), and the first positive-fitting element (68) extends axially away from the radial section (62).

10. The torsional vibration damper (10) according to any one of the preceding claims, characterized in that The torsional vibration damper (10) is a dual mass flywheel (12), the first damper element (16) comprises a primary flywheel (18) and the cover element (20), and the friction element (50) can be twisted relative to the cover element (20) in a frictional manner to form a friction area (56).

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