Torsional Vibration Damper or Torsional Tuned Mass Damper

Abstract

A torsional vibration damper or torsional tuned mass damper having a rotating system having a primary mass, which is arranged, or preferably fixable for conjoint rotation on a rotatable shaft, such as a crankshaft of a motor, for example, in particular an internal combustion engine, and having a secondary mass, which is movable relative to the primary mass. An assembly for vibration dampening and/or tuned vibration dampening of the relative motion between the primary mass and the secondary mass is formed in part outside of the rotating system of the torsional vibration damper or torsional tuned mass damper.

Claims

1.-10. (Canceled)

11. A torsional vibration damper or torsional vibration attenuator, comprising: a rotating system having a primary mass which is arranged on a rotatable shaft of a motor, and having a secondary mass which is movable relative to the primary mass, and having a sub-assembly for vibration damping and/or vibration attenuation of a relative movement between the primary mass and the secondary mass, wherein the sub-assembly for vibration damping and/or vibration attenuation of the relative movement between the primary mass and the secondary mass is constructed partially outside the rotating system of the torsional vibration damper or torsional vibration attenuator.

12. The torsional vibration damper or torsional vibration attenuator as claimed in claim 11, wherein the sub-assembly for vibration damping and/or vibration attenuation of the relative movement between the primary mass and the secondary mass has one or more fluid-filled chambers as part of the rotating system, a volume of which is changeable in an event of rotational vibrations and resultant relative movements between the primary mass and secondary mass.

13. The torsional vibration damper or torsional vibration attenuator as claimed in claim 12, wherein the volume change is transmitted via a rotary transmission for a fluid from the rotating system via one or more lines into a region which does not also rotate outside the rotating system.

14. The torsional vibration damper or torsional vibration attenuator as claimed in claim 13, wherein the lines are connected to one or more damping and/or attenuating elements outside the rotating system so that an occurrence of a vibration-damping or vibration-attenuating action is fed back via the one or more lines into the rotating system.

15. The torsional vibration damper or torsional vibration attenuator as claimed in claim 14, wherein the one or more vibration-damping and/or vibration-attenuating elements comprise, outside the rotating system, at least one hydraulic cylinder.

16. The torsional vibration damper or torsional vibration attenuator as claimed in claim 14, wherein the one or more vibration-damping and/or vibration-attenuating elements comprise, outside the rotating system, at least one potential energy store.

17. The torsional vibration damper or torsional vibration attenuator as claimed in claim 14, wherein the one or more vibration-damping elements comprise outside the rotating system at least one damping device.

18. The torsional vibration damper or torsional vibration attenuator as claimed in claim 14, wherein the one or more vibration-damping or vibration-attenuating elements comprise, outside the rotating system, at least one actively operating device.

19. The torsional vibration damper or torsional vibration attenuator as claimed in claim 18, wherein the at least one actively operating device is a controllable pump.

20. The torsional vibration damper or torsional vibration attenuator as claimed in claim 11, wherein two mutually diametrically opposed chambers are provided in each case.

21. The torsional vibration damper or torsional vibration attenuator as claimed in claim 20, wherein the chambers are sub-divided in each case by radially extending webs of a hub portion, on the one hand, and a damping ring, on the other hand.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1 is a schematically illustrated cross-section transverse relative to the rotation axis of a torsional vibration damper or torsional vibration attenuator according to the invention; and

[0031] FIG. 2 is a schematically illustrated radial section through the torsional vibration damper or torsional vibration attenuator according to the invention from FIG. 1 and a schematically illustrated hydraulic cylinder, a spring and a damper.

DETAILED DESCRIPTION OF THE DRAWINGS

[0032] In FIG. 1, a secondary massin this instance a damping ringis designated 1 and a primary massin this instance, a hub portionof a torsional vibration damper or torsional vibration attenuatorin particular also of a damped torsional vibration attenuatoris designated 2, wherein below for reasons of simplification only a torsional vibration damper is referred to. The hub portion 2 serves in a manner known per se to secure to a shaft 3, for example, of an internal combustion engine, as indicated in FIG. 2 as a result. The primary mass 2 and secondary mass 1 form a system which rotates during operation.

[0033] Between the secondary massin this instance, the damping ring 1and the primary massin this instance, the hub portion 2as shown very clearly in FIG. 1, a plurality of chambers 4, 5 which are filled with fluid or air are provided, wherein these chambers 4, 5 are each delimited by radially extending webs 6 of the hub portion 2 or 7 of the damping ring 1. The chambers 4, 5 form a portion of the rotating system. They additionally form a portion of a sub-assembly for vibration damping and/or vibration attenuation of the relative movement between the damping ring 1 and the hub portion 2, wherein this sub-assembly is partially formed outside the rotating system of the torsional vibration damper. This means that it has one or more components therein.

[0034] The mentioned chambers 4, 5 are connected to a hydraulic or pneumatic rotary transmission 8 by radial holes 9 and 10, respectively.

[0035] As a result of the rotary transmission 8 mentioned, the radial holes 9 and 10 are connected to lines 9 and 10 which lead outward and which are located in a non-rotating region. These lines 9, 10 open in the illustrated embodiment according to FIG. 2 in a housing 11, inside which a piston 12 is movably arranged.

[0036] In this manner, another portion of the sub-assembly for vibration damping and/or vibration attenuation of the relative movement is formed between the damping ring 1 and hub portion 2, wherein this portion of the sub-assembly is constructed completely or partially outside the rotating system of the torsional vibration damper or torsional vibration attenuator.

[0037] The piston rod 13 of the piston 12 is in this instance loaded by a potential energy store, in particular a spring, in a particularly preferred manner a helical spring 14. A mechanical damping element 15 is arranged parallel with this spring.

[0038] Consequently, the components required for a vibration damping (and/or absorption) are placed in the non-rotating outer region of the shaft 3 which is intended to be influenced so that all the required measures can be carried out in this region and, which is a significant advantage, can also be changed.

[0039] It is thus possible, for example, by changing the adjustment of the helical spring 14, to change the absorber frequency as desired. Similarly, in place of a helical spring as a force store, a pneumatic spring can also be used and may have a changeable rigidity as a result of a lesser or greater extent of pumping up.

[0040] An adjustment of the helical spring 14 and damping element 15 can subsequently be adapted at any time to the vibration behavior of the present system.

[0041] In addition, active elements (which are not illustrated in the drawings), such as, for example, hydraulic pumps, can further improve the vibration behavior of the system.

[0042] It is also possible to produce a semi-active system, for example, by means of a speed-dependent switching-on or off of spring or damper elements in a simple manner.

[0043] On the whole, only cost-effective, standardized structural elements, such as helical pressure springs, shock-absorbers and hydraulic or pneumatic transmissions are required for the entire sub-assembly.

[0044] As can be seen in particular in FIG. 1, there are provided in each case two mutually diametrically opposed chambers 4, 5 which are subdivided in the manner set out by means of the radially extending webs 6 of the hub portion 2 and 7 of the damping ring 1.

LIST OF REFERENCE NUMERALS

[0045] 1 Damping ring [0046] 2 Hub portion [0047] 3 Shaft [0048] 4 Chamber [0049] 5 Chamber [0050] 6 Web [0051] 7 Hub portion [0052] 8 Rotary transmission [0053] 9 Radial hole/Line [0054] 10 Radial hole/Line [0055] 11 Housing [0056] 12 Piston [0057] 13 Piston rod [0058] 14 Helical spring [0059] 15 Damping element