TORSIONAL VIBRATION DAMPER

Abstract

A torsional vibration damper includes an input part for introducing a torque, two intermediate elements, an energy storage element designed as a compression spring that acts on the intermediate elements, an output part for discharging a vibration-damped torque, and an elastic or resilient compensation part provided between the output part and the intermediate elements. The intermediate elements are designed as pendulum rockers and are movement-coupled to the input part. Each of the intermediate elements can move towards and away from the other in a linear motion. The output part is movement-coupled to the intermediate elements and rotatable relative to the intermediate elements. The compensation part is for eliminating play of the intermediate elements relative to the output part in an axial direction.

Claims

1.-10. (canceled)

11. A torsional vibration damper comprising: an input part for introducing a torque; two intermediate elements: designed as pendulum rockers; movement-coupled to the input part; and each being able to move towards and away from the other in a linear motion; an energy storage element designed as a compression spring that acts on the intermediate elements; an output part for discharging a vibration-damped torque: movement-coupled to the intermediate elements; and rotatable relative to the intermediate elements; and an elastic or resilient compensation part provided between the output part and the intermediate elements for eliminating play of the intermediate elements relative to the output part in an axial direction.

12. The torsional vibration damper of claim 11 wherein the torsional vibration damper is a pendulum rocker damper.

13. The torsional vibration damper of claim 11, wherein: the output part comprises: a first output disc; and a second output disc coupled to the first output disc in a rotationally fixed manner; the intermediate elements are arranged axially between the first output disc and the second output disc; and the compensation part is arranged: axially between the first output disc and the intermediate elements; or axially between the intermediate elements and the second output disc.

14. The torsional vibration damper of claim 11, wherein the compensation part is designed as a plate spring or a corrugated sheet.

15. The torsional vibration damper of claim 11, wherein the compensation part is rotationally fixed to the output part.

16. The torsional vibration damper of claim 11, further comprising a friction element, wherein the compensation part acts indirectly on the intermediate elements or on the output part through the friction element.

17. The torsional vibration damper of claim 11, wherein: each of the intermediate elements comprises a friction element on an axial side of the intermediate element pointing towards the compensation part; and each of the intermediate elements is largely shrouded by the friction element.

18. The torsional vibration damper of claim 17, wherein the friction element is designed as a two-part sleeve covering more than half of both axial sides of the intermediate element.

19. The torsional vibration damper of claim 17, wherein the friction element is designed to be elastic or resilient in the axial direction to form the compensation part.

20. The torsional vibration damper of claim 11, wherein: the input part comprises a first input disc and a second input disc coupled in a rotationally fixed manner to the first input disc; the intermediate elements are arranged in the axial direction between the first input disc and the second input disc; and a first side of the compensation part is supported on one of the intermediate elements; and a second side of the compensation part, opposite the first side, is supported on the output part and on the input part.

21. The torsional vibration damper of claim 11, wherein: the intermediate elements are coupled to the input part via a first cam mechanism in such a way that a relative rotation of the input part relative to the intermediate elements is convertible into a linear movement of the intermediate elements towards one another or away from one another; and the output part is coupled to the intermediate elements via a second cam gear such that a relative linear movement of the intermediate elements with respect to one another is convertible into a rotary movement of the output part relative to the intermediate elements.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the following, the disclosure is explained by way of example with reference to the attached drawings using exemplary embodiments, the features shown below being able to represent an aspect of the disclosure both individually and in combination. In the figures:

[0024] FIG. 1 shows a schematic plan view of a torsional vibration damper,

[0025] FIG. 2 shows a schematic sectional view of the torsional vibration damper from FIG. 1 along a sectional plane A-A,

[0026] FIG. 3 shows a schematic sectional view of an alternative embodiment of the torsional vibration damper from FIG. 1 along a sectional plane A-A,

[0027] FIG. 4 shows a schematic perspective view of a compensation part,

[0028] FIG. 5 shows a schematic sectional view of part of a powertrain and

[0029] FIG. 6 shows a schematic sectional view of a friction clutch.

DETAILED DESCRIPTION

[0030] The torsional vibration damper 10 shown in FIG. 1 and FIG. 2, designed as a pendulum rocker damper, has an input part 12 which is composed of two outer input disks and can be part of a coupling disk 48 of a friction clutch 42 in a powertrain 36 of a motor vehicle (ref. FIG. 5-6), for example. For example, on the radially outer edge of the input part 12, friction linings of the coupling disc 48 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.

[0031] 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 of the input part 12 with respect to 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 one another or away from one another, which results in compression or relaxation of the energy storage elements 16.

[0032] 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 of the output part 22 with respect to the intermediate elements 16. The output part 22 has a first output disc 24 and a second output disc 26, between which the intermediate elements 16 are arranged. The output part 22 can be connected in a rotationally fixed manner to a hub which, for example, has an internal toothing in order to be able to engage a spline toothing with a transmission input shaft 40 of a motor vehicle transmission.

[0033] Axial play between the intermediate elements 16 and the output part 22 can be eliminated by a compensation part 28 preloaded in the axial direction between the intermediate element 16 and the first output disc 24 and/or between the intermediate element 16 and the second output disc 26, thereby preventing the intermediate element 16 from tilting out of a radial plane of the torsional vibration damper 10. In this case, the output part 22 can additionally press against the intermediate part 16 with an axial spring force supported on the output part 22 and exert a frictional force. As a result, the relative movement of the intermediate elements 16 with respect to the output part 22 can be used to provide deliberate frictional damping. To set a defined friction behavior, friction elements 30 are provided between the intermediate elements 16 and the first output disc 24 on the one hand and between the intermediate elements 16 and the second output disc 26 on the other hand.

[0034] For example, the friction elements 30 are optionally coupled in a rotationally fixed manner to the output part 22 via the intermediate output part 22, so that the frictional damping can take place on the intermediate element 16 and/or on the compensation part 28 due to a relative rotation of the output part 22 together with the friction linings 30. The compensation part 28 can be coupled to the intermediate part 16 or to the output part 22 in a manner fixed against movement. Alternatively, the friction elements 30 are optionally coupled to the intermediate part 16 in a manner fixed against movement via the intermediate output part 22, so that the frictional damping can take place on the intermediate element 16 and/or on the compensation part 28 due to a relative rotation of the output part 22 together with the friction linings 30.

[0035] The compensation part 28 can be coupled to the intermediate part 16 or to the output part 22 in a manner fixed against movement. In the exemplary embodiment shown in FIG. 2, the compensation part 28 is only provided on one axial side of the intermediate element 16, as a result of which the intermediate element 16 is supported on the output part 22 via the interposed friction element 30 on the other axial side without an intermediate compensation part 28. On the axial side of the intermediate element 16 facing the compensation part 28, the compensation part 28 is arranged between the intermediate part 16 and the friction lining 30 supported on the output part 22. However, it is also possible to support the compensation part 28 directly on the output part 22 and to press it against the intermediate element 16 via the friction lining 30.

[0036] The friction elements 30 are designed, for example, as separate disc-shaped components. Since the input discs of the input part 12 overlap the output disks 24, 26 of the output part 22 radially on the outside, the intermediate element 16 can also be axially supported by friction against tilting on the input part 12, radially on the outside, via the interposed friction element 30 and/or the compensation part 28.

[0037] In the exemplary embodiment of the torsional vibration damper 10 shown in FIG. 3, in comparison to the exemplary embodiment of the torsional vibration damper 10 shown in FIG. 2, the friction elements 30 are designed as sleeves which envelop the intermediate element 16 and, for this purpose, engage around the intermediate element 16 radially on the inside. In addition, the friction element 30 is designed to be elastic and/or resilient in the axial direction, so that the friction elements 30 clamped at least lightly between the output disks 24, 26 also eliminate the axial play of the intermediate element 16 and thereby simultaneously form the output part 22. In comparison to the exemplary embodiment of the torsional vibration damper 10 shown in FIG. 2, the friction elements 30 and the compensation part 28 are not designed as separate components, but rather as a common, integral component.

[0038] If the compensation part 28 is designed as a separate component to the friction element 30, the compensation part 28 can be designed, for example, as a plate spring, which is designed to be closed in the circumferential direction. Alternatively, the compensation part 28 can be designed as a corrugated sheet, as shown in FIG. 4, which is provided as a corrugated sheet only in a limited angular range, for example essentially oriented tangentially. Due to the undulating shape, the compensation part 28 can have, for example, two first contact surfaces 32 which face the intermediate element 16, and three second contact surfaces 34 which face the output part 22.

[0039] The powertrain 36 of an electrically drivable motor vehicle, for example, a hybrid motor vehicle, partially shown in FIG. 5, has a flywheel 38, via which a torque generated in an electrical machine can be introduced and transmitted to a transmission input shaft 40 of a motor vehicle transmission. In the torque flow between the flywheel 38 and the transmission input shaft 40, a torsional vibration damper 10 is provided, which can be designed and developed as described above.

[0040] The friction clutch 42 shown in FIG. 6 for a powertrain 36 of a motor vehicle has a counter plate 44 which can be connected directly or indirectly to a drive shaft of a motor vehicle engine and via which the torque generated by the motor vehicle engine can be introduced. With the aid of a pressure plate 46 that can be displaced axially relative to the counter plate 44, a coupling disc 48, which is connected in a rotationally fixed manner to a transmission input shaft 40, can be compressed in a frictionally locking manner. The coupling disc 48 has a torsional vibration damper 10 which acts as a disc damper and which can be designed and developed as described above.

REFERENCE NUMERALS

[0041] 10 torsional vibration damper [0042] 12 input part [0043] 14 first cam mechanism [0044] 16 intermediate elements [0045] 18 energy storage element [0046] 20 second cam mechanism [0047] 22 output part [0048] 24 first output disc [0049] 26 second output disc [0050] 28 compensation part [0051] 30 friction element [0052] 32 first contact surface [0053] 34 second contact surface [0054] 36 powertrain [0055] 38 flywheel [0056] 40 transmission input shaft [0057] 42 friction clutch [0058] 44 counterplate [0059] 46 pressure plate [0060] 48 coupling disc