TORSIONAL VIBRATION DAMPER

Abstract

A torsional vibration damper includes an input part for introducing a torque, a first cam mechanism, an intermediate element, a compression spring engaged with the intermediate element, a second cam mechanism for discharging a vibration-damped torque, and a frictional element for friction damping. The intermediate element is coupled to the input part via the first cam mechanism such that a relative rotation between the input part and the intermediate element is converted into a linear movement of the intermediate element radially inward or radially outward. The output part is coupled to the intermediate element via the second cam mechanism such that a linear movement of the intermediate element is converted into a relative rotation between the output part and the intermediate element. The frictional element is pressed against the intermediate element or the output part. The frictional element may be movement-coupled to the intermediate element or the output part.

Claims

1.-9. (canceled)

10. A torsional vibration damper comprising: an input part for introducing a torque, a first cam mechanism; an intermediate element coupled to the input part via the first cam mechanism such that a relative rotation between the input part and the intermediate element is converted into a linear movement of the intermediate element radially inward or radially outward; a compression spring engaged with the intermediate element; a second cam mechanism; an output part for discharging a vibration-damped torque, coupled to the intermediate element via the second cam mechanism such that a linear movement of the intermediate element is converted into a relative rotation between the output part and the intermediate element; and a first frictional element for friction damping, pressed against the intermediate element or the output part.

11. The torsional vibration damper of claim 10 wherein the first frictional element is movement-coupled to the intermediate element or the output part.

12. The torsional vibration damper of claim 10, wherein: the output part covers the intermediate element when viewed in an axial direction; and the first frictional element is arranged axially between the intermediate element and the output part.

13. The torsional vibration damper of claim 10 further comprising a second frictional element, wherein: the output part comprises a first output disk and a second output disk coupled to the first output disk in a rotationally fixed manner; the intermediate element is arranged axially between the first output disk and the second output disk; the first frictional element is arranged between the intermediate element and the first output disk; and the second frictional element is arranged between the intermediate element and the second output disk.

14. The torsional vibration damper of claim 10, wherein: the first frictional element is suspended on the intermediate element or on the output part; the first frictional element comprises an inner suspension lug and an outer suspension lug; and the first frictional element is secured in a radial or tangential direction by the inner suspension lug and the outer suspension lug.

15. The torsional vibration damper of claim 10 further comprising a spring element, wherein: the output part comprises a first output disk and a second output disk coupled to the first output disk in a rotationally fixed manner; the first output disk and the second output disk are axially displaceable relative to the intermediate element; and the spring element is arranged to act on a rear side of the output part facing away from the first frictional element to press the first frictional element between the intermediate element and the output part.

16. The torsional vibration damper of claim 15, wherein the spring element is a pretensioned plate spring or a pretensioned elastomer body.

17. The torsional vibration damper of claim 10 further comprising a spring element arranged between the output part and the intermediate element to press the first frictional element against the intermediate element or the output part.

18. The torsional vibration damper of claim 17, wherein the spring element is a pretensioned plate spring or a pretensioned elastomer body.

19. The torsional vibration damper of claim 10, wherein the first frictional element is a separate component from the intermediate element and the output part.

20. The torsional vibration damper of claim 10, wherein: the first friction element comprises a friction surface; and the first friction element includes carbon fibers comprising polyamide, Teflon or graphite on the friction surface.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the following, the disclosure is explained by way of example with reference to the attached drawings using exemplary embodiments, where the features shown below can represent an aspect of the disclosure both individually and in combination. In the figures:

[0022] FIG. 1 shows a schematic perspective exploded view of a first embodiment of a torsional vibration damper,

[0023] FIG. 2 shows a schematic top view of the torsional vibration damper from FIG. 1,

[0024] FIG. 3 shows a schematic sectional view of the torsional vibration damper from FIG. 2 along a sectional plane H-H, and

[0025] FIG. 4 shows a schematic simplified sectional view of a second embodiment of a torsional vibration damper.

DETAILED DESCRIPTION

[0026] The torsional vibration damper 10 shown in FIG. 1, designed as a pendulum rocker damper, has an input part 12 which comprises two outer input disks and, for example, can be part of a coupling disk of a friction clutch in a powertrain of a motor vehicle. For example, on the radially outer edge of the input part 12, friction linings of the coupling disk can be provided, via which a torque generated by a motor vehicle engine can be introduced. The input part 12 is coupled via a respective first cam mechanism 14 to two intermediate elements 16 designed as pendulum rockers. To form the first cam mechanism 14, the input part 12 and the intermediate element 16 can have suitably designed straight and/or curved tracks or ramps, on which a roller, rolling element or other coupling element can be guided.

[0027] Between the two intermediate elements 16, two energy storage elements 18 are provided, which run parallel to one another and are designed as compression springs. In the event of a relative rotation between the input part 12 and the intermediate elements 16 caused by a torsional vibration, the first cam mechanism 14 can convert the relative rotation of the input part 12 into a linear relative displacement of the intermediate elements 16 towards or away from one another, which results in compression or relaxation of the energy storage elements 18.

[0028] The intermediate elements 16 are coupled to an output part 22 by means of second cam mechanisms 20 which are designed essentially analogously to the first cam mechanisms 14. In the event of a linear movement of the intermediate elements 16, the second cam mechanism 20 can convert the linear movement of the intermediate elements 16 into a relative rotation between the output part 22 and the intermediate elements 16. The output part 22 has a first output disk 24 and a second output disk 26 between which the intermediate elements 16 are arranged. The output part 22 can be connected in a rotationally fixed manner to a hub 28 which, for example, has an internal toothing to be able to engage a spline toothing with a transmission input shaft of a motor vehicle transmission.

[0029] As a result, the relative movement between the intermediate elements 16 and the output part 22 can be used to provide deliberate damping under the effect of friction. Here, frictional elements 30 are provided between the intermediate elements 16 and the first output disk 24 on the one hand and between the intermediate elements 16 and the second output disk 26 on the other hand. The frictional elements 30 have radially inner first suspension lugs 32 and radially outer second suspension lugs 34 to suspend the respective frictional element 30 on the associated intermediate element 16 and in particular to clamp the assigned intermediate element 16 between the first suspension lugs 32 and the second suspension lugs 34. This also results in a fixed connection between the frictional element 30 and the intermediate element 16.

[0030] In the exemplary embodiment shown in FIGS. 1 to 3, a spring element 36 designed as a plate spring is provided, which is optionally supported on the input part via a slide ring 38 and is pretensioned against the output part 22, for example the first output disk 24. The output disks 24, 26, which are movable in the axial direction, can be pressed together with the intermediate elements 16 against an axial stop 40, as a result of which the frictional elements 30 are pressed between the intermediate elements 16 and the output disks 24, 26. In the illustrated exemplary embodiment, the axial stop 40 is formed by a further damping stage 42 which is fixed against movement in the axial direction.

[0031] In the exemplary embodiment of the torsional vibration damper 10 shown in FIG. 4, in comparison to the exemplary embodiment of the torsional vibration damper 10 shown in FIGS. 1 to 3, the output disks 24, 26 of the output part 22 are held at a constant spacing apart from one another and from the intermediate elements 16, for example, with the help of spacing elements. In this case, a spring element 36, for example, in the form of a plate spring, is provided on both axial sides of the intermediate elements 16, which are supported on the associated output disk 24, 26, preferably in a manner fixed against movement, and press the respective frictional element 30 against the intermediate element 16. It is fundamentally possible for the frictional element 30 to be carried along by the spring element 36 and to carry out a movement under the effect of friction relative to the intermediate element 16.

[0032] Alternatively, the frictional element 30, in particular comparable to the embodiment of the torsional vibration damper 10 in FIG. 3, can be fixed in a rotationally fixed manner to the intermediate element 16, while the spring element 36 is fixed in a rotationally fixed manner to the output disk 24, 26, so that a relative movement under the effect of friction between the frictional element 30 and the spring element 36 can take place. A contact area of the spring element 36, which is designed in particular as a plate spring, may be formed on the frictional element 30 as a dome so as to avoid sliding contact on a sharp-edged rim of the spring element 36 and to avoid incorporation of the spring element 36 into the material of the frictional element 30.

REFERENCE NUMERALS

[0033] 10 Torsional vibration damper [0034] 12 Input part [0035] 14 First cam mechanism [0036] 16 Intermediate elements [0037] 18 Energy storage element [0038] 20 Second cam mechanism [0039] 22 Output part [0040] 24 First output disk [0041] 26 Second output disk [0042] 28 Hub [0043] 30 Frictional element [0044] 32 First suspension lug [0045] 34 Second suspension lug [0046] 36 Spring element [0047] 38 Slide ring [0048] 40 Axial stop [0049] 42 Further damping stage