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. 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; a secondary mass which is movable relative to the primary mass, and 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 at a location which does not rotate with the rotating system, the sub-assembly includes, as part of the rotating system, one or more fluid-filled chambers having a volume which is changeable in response to the relative movement between the primary mass and secondary mass, a change in the volume of the one or more fluid-filled chambers results in movement of a fluid between the fluid-filled chambers of the rotating system and two or more lines of the sub-assembly outside the rotating system which do not rotate with the rotating system, the sub-assembly includes one or more vibration-damping and/or vibration-attenuating elements outside the rotating system which do not rotate with the rotating system, the one or more vibration-damping and/or vibration-attenuating elements outside the rotating system which do not rotate with the rotating system include at least one hydraulic cylinder having mutually diametrically opposed chambers, and each of the two or more lines is connected to a respective hydraulic connection of respective ones of the mutually diametrically opposed chambers of the at least one hydraulic cylinder such that the fluid movement in the two or more lines causes a piston in the at least one hydraulic cylinder to move such that fluid movement from one of the one or more fluid-filled chambers of the rotating system into one of the mutually diametrically opposed chambers displaces fluid in the other of the mutually diametrically opposed chambers into another one of the one or more fluid-filled chambers of the rotating system.

2. The torsional vibration damper or torsional vibration attenuator as claimed in claim 1, wherein the one or more vibration-damping and/or vibration-attenuating elements outside the rotating system and the at least one hydraulic cylinder feed back a vibration-damping or vibration-attenuating action via the one or more lines into the rotating system.

3. The torsional vibration damper or torsional vibration attenuator as claimed in claim 2, wherein the one or more vibration-damping and/or vibration-attenuating elements comprise, outside the rotating system, at least one potential energy store connected to the piston of the at least one hydraulic cylinder.

4. The torsional vibration damper or torsional vibration attenuator as claimed in claim 2, wherein the one or more vibration-damping elements comprise outside the rotating system at least one damping device connected to the piston of the at least one hydraulic cylinder.

5. The torsional vibration damper or torsional vibration attenuator as claimed in claim 2, wherein the one or more vibration-damping or vibration-attenuating elements comprise, outside the rotating system, at least one actively operating device connected to the piston of the at least one hydraulic cylinder.

6. The torsional vibration damper or torsional vibration attenuator as claimed in claim 5, wherein the at least one actively operating device is a controllable pump.

7. The torsional vibration damper or torsional vibration attenuator as claimed in claim 1, wherein the one or more chambers are sub-divided in each case by radially extending webs of a hub portion and radially extending webs of a damping ring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) 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

(2) 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

(3) In FIG. 1, a secondary mass—in this instance a damping ring—is designated 1 and a primary mass—in this instance, a hub portion—of a torsional vibration damper or torsional vibration attenuator—in particular also of a damped torsional vibration attenuator—is 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.

(4) Between the secondary mass—in this instance, the damping ring 1—and the primary mass—in this instance, the hub portion 2—as 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.

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

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

(7) 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.

(8) 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.

(9) 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.

(10) 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.

(11) 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.

(12) 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.

(13) 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.

(14) 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.

(15) 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

(16) 1 Damping ring 2 Hub portion 3 Shaft 4 Chamber 5 Chamber 6 Web 7 Hub portion 8 Rotary transmission 9 Radial hole/Line 10 Radial hole/Line 11 Housing 12 Piston 13 Piston rod 14 Helical spring 15 Damping element