Torsional vibration damper comprising a damping system, a damping device and a ground device

Abstract

A torsional vibration damper (70) with a damping device which has an input (67) and an output (72) which is operatively connected to a driven side (73). The output is connected to a mass damper system (1) and also to a mass arrangement (100). One of the two subassembliesi.e., mass damper system (1) and mass arrangement (100)which are connected to the output (72) of the damping device (70) engages at the respective other subassembly comprising mass damper system or mass arrangement which is in turn connected to the output by a connection arrangement (77).

Claims

1. A torsional vibration damper comprising a damping device (70) having an input (67) and an output (72) operatively connected to a driven side (73); a connection arrangement (77); two subassemblies comprising a mass damper system (1) and a mass arrangement (100); said output (72) of the damping device being connected to said mass damper system (1) and to said mass arrangement (100); wherein one of said two subassemblies comprising said mass damper system (1) and said mass arrangement (100) which are connected to said output (72) of said damping device (70) engages at said respective other subassembly comprising said mass damper system (1) and said mass arrangement (100) and wherein said other subassembly is connected to said output (72) by said connection arrangement (77); and wherein said mass damper system (1) comprises a damper mass carrier (3) and at least one damper mass (7) at said damper mass carrier (3) and said mass arrangement (100) having at least one holder (102); wherein said mass arrangement (100) has a first connection (93) to said damper mass carrier (3) of said mass damper system (1) by said holder (102), and wherein said damper mass carrier (3) has a second connection (94) to said output (72) by said connection arrangement (77).

2. The torsional vibration damper according to claim 1, additionally comprising a torsion damper hub (71) comprising a radial support (97) for said damper mass carrier (3) of said mass damper system (1); and wherein said output (72) is connected to said torsion damper hub (71) serving as the driven side (73).

3. The torsional vibration damper according to claim 2, wherein said damper mass carrier (3) comprises at least one damper mass carrier element (5a); said radial support (97) at said torsion damper hub (71) has a first toothing (95), and said at least one damper mass carrier element (5a) has a second toothing (96) in operative connection with said first toothing (95), and wherein said first and second toothings (95, 96) are held in an axially predetermined position relative to one another by an interference fit (134) to form said connection arrangement (77).

4. The torsional vibration damper according to claim 1, additionally comprising a torsion damper hub (71) which serves as driven side (73) and wherein said mass damper system (1) comprising the damper mass carrier (3) and at least one damper mass (7) at said damper mass carrier (3) and said mass arrangement (100) having at least one holder (102); wherein said output (72) is connected to said torsion damper hub (71), said torsion damper hub (71) having a radial support (97) for said damper mass carrier (3) of said mass damper system (1) and for said holder (102) of said mass arrangement (100).

5. The torsional vibration damper according to claim 4, additionally comprising the torsion damper hub (71) and the damper mass carrier (3) having at least one damper mass carrier element (5a, 5b), and wherein said connection arrangement (77) comprises a plurality of axially multi-stepped rivets (76) extending through said torsion damper hub (71) and through said damper mass carrier element (5a).

6. The torsional vibration damper according to claim 4, additionally comprising a hydrodynamic coupling arrangement (56) having a hydrodynamic circuit (60) formed at least by an impeller (61) and a turbine (62) and having a clutch device (64) for bypassing the hydrodynamic circuit (60) in predetermined operating states; wherein said mass arrangement (100) is formed by said turbine (62); and said holder (102) of said mass arrangement (100) is formed by a turbine base (92) of said turbine (62).

7. The torsional vibration damper according to claim 1, additionally comprising a torsion damper hub (71) which serves as driven side (73) and the damper mass carrier (3) having at least one damper mass carrier element (5a, 5b), and wherein said connection arrangement (77) comprises a plurality of axially multi-stepped rivets (76) extending through said torsion damper hub (71) and through said damper mass carrier element (5a).

8. The torsional vibration damper according to claim 1, wherein said damping device (70) comprises an individual damping unit or a plurality of damping units (68, 69) of which said respective damping unit (68) on a drive side (18) is in operative connection with the respective damping unit (69) on the driven side (73) via an intermediate transmission (74), and wherein said individual damping unit or said at least one damping unit (68, 69) of said damping device (70) comprise a selection of a predetermined combination of energy storages (98), a configuration of energy storages (98) for a predetermined load, or a construction of energy storages (98) with a predetermined coil progression.

9. The torsional vibration damper according to claim 8, wherein said at least one damping unit (68, 69) of said damping device (70) comprises a plurality of energy storages (98a, 98b) which differ from one another with respect to their stiffness or with respect to their extension in an operative direction in order to generate a multi-step characteristic.

10. The torsional vibration damper according to claim 9, wherein said energy storages (98a, 98b) constructed with relatively greater and relatively smaller extension in an operative direction are arranged concentric to one another; and wherein the energy storage (98a) with the relatively greater extension in extension direction surrounds the energy storage (98b) with the relatively smaller extension in extension direction.

11. The torsional vibration damper according to claim 8, wherein said at least one of said damping units (68, 69) of said damping device (70) comprises energy storages (98) which are configured for partial load with respect to an available torque.

12. The torsional vibration damper according to claim 8, wherein said at least one of said damping units (68, 69) of said damping device (70) comprises energy storages (98) having coils (99) which have in an extension direction at least a portion in which distances of said coils (99) relative to one another diverge from those distances between the coils (99) that are provided at other portions of said energy storages (98).

13. The torsional vibration damper according to claim 1, additionally comprising a hydrodynamic coupling arrangement (56) having a hydrodynamic circuit (60) formed at least by an impeller (61) and a turbine (62) and having a clutch device (64) for bypassing the hydrodynamic circuit (60) in predetermined operating states; wherein said mass arrangement (100) is formed by said turbine (62); and said holder (102) of said mass arrangement (100) is formed by a turbine base (92) of said turbine (62).

14. The torsional vibration damper according to claim 1, additionally comprising a radial support (97) at said torsion damper hub (71); wherein said damper mass carrier (3) comprises at least one damper mass carrier element (5a); said radial support (97) has a first toothing (95), and said at least one damper mass carrier element (5a) has a second toothing (96) in operative connection with said first toothing (95), and wherein said first and second toothings (95, 96) are held in an axially predetermined position relative to one another by an interference fit (134) to form said connection arrangement (77).

15. The torsional vibration damper according to claim 1, wherein said damping device (70) comprises an individual damping unit or a plurality of damping units (68, 69) of which said respective damping unit (68) on a drive side (18) is in operative connection with the respective damping unit (69) on the driven side (73) via an intermediate transmission (74), and wherein said individual damping unit or said at least one damping unit (68, 69) of said damping device (70) comprise a selection of a predetermined combination of energy storages (98), a configuration of energy storages (98) for a predetermined load, or a construction of energy storages (98) with a predetermined coil progression.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be further described in detail with reference to the drawings in which:

(2) FIG. 1 is a sectional view through a torsional vibration damper in a coupling arrangement with a damping device whose input is connected to a clutch device and whose output is connected to a mass damper system and a mass arrangement;

(3) FIG. 2 is a top view of the mass damper system in the direction II-II in FIG. 1 in an operating state;

(4) FIG. 3 is the same as FIG. 2, but with the mass damper system in neutral state;

(5) FIG. 4 is the same as FIG. 1, but with the mass arrangement connected to the output via the mass damper system;

(6) FIG. 5 is a sectional view of an energy storage of the damping device with different coil spacing (FIG. 5a) and with different extension length (FIG. 5b);

(7) FIG. 6 is the same as FIG. 1, but with the output connected to a mass damper system and a mass arrangement by teeth.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

(8) FIG. 1 shows a coupling arrangement 56 which has a housing 54 and, since it is constructed as a hydrodynamic torque converter 90, a hydrodynamic circuit 60 with impeller 61, turbine 62 and stator 63. Further, a clutch device 64 is provided which is formed with a clutch piston 65 and with a friction disk clutch 66, wherein radially outer friction disk elements 84 of the friction disk clutch 66 are in toothed engagement with an outer wall 86 of the housing 54 and radially inner friction disk elements 85 of the friction disk clutch 66 are in toothed engagement with a friction disk element carrier 87 which engages at an input 67 of a damping device 70. Depending on the control of the clutch piston 65 which is arranged on a piston carrier 82 so as to be axially displaceable, the clutch device 64 is movable between an engagement position and a release position. The input 67 of the damping device 70 is connected via a first damping unit 68 to an intermediate transmission 74 which has two intermediate transmission elements 74a and 74b arranged so as to be spaced apart axially and held at a fixed axial distance by spacer elements 81. The intermediate transmission 74 is connected via a second damping unit 69 to an output 72 which cooperates with a torsion damper hub 71 acting as driven side 73. The damping device 70 serves together with a mass damper system 1 and a mass arrangement 100 as torsional vibration damper 30, the mass arrangement 100 being formed in the present case by the turbine 62.

(9) As is further shown in FIG. 1, the mass damper system 1 has a damper mass carrier 3 with two damper mass carrier elements 5a and 5b arranged so as to be spaced apart axially, damper masses 7 being received therebetween. Spacer pieces 11 which serve in each instance to receive an annular component part 32 (FIGS. 2, 3) as will be described in detail in the following are provided axially between the two damper mass carrier elements 5a and 5b. In contrast to damper mass carrier element 5b, damper mass carrier element 5a has a radially inwardly extending radial lengthening 78 in order to be connected to the output 72 of the torsional vibration damper 30 and, therefore, to the torsion damper hub 71 forming the driven side 73 by a connection arrangement 77 formed as riveted joint. The mass arrangement 100 also has a radially inwardly extending holder 102 which is formed by the turbine base 92 and which is connected by the connection arrangement 77 to the output 72 of the torsional vibration damper 30 and, therefore, to the torsion damper hub 71 forming the driven side 73. In order that the radial lengthening 78 of the mass damper system 1 and the holder 102 of the mass arrangement 100 can be connected to the output 72 as well as to the torsion damper hub 71, the connection arrangement 77 has axially multi-stepped rivets 76. Not only do these axially multi-stepped rivets 76 connect all of the above-mentioned component parts to one another axially, but beyond this they also form intermediate riveted joints 83 such that, for example, the radial lengthening 78 of the mass damper system 1 and the holder 102 of the mass arrangement 100 are first connected to the output 72 and to the torsion damper hub 71 when the connection of the two latter component parts, i.e., output 72 and torsion damper hub 71, has already been produced. Accordingly, a staggered production is possible, which has advantages in the manufacturing process.

(10) The mass damper system 1 is supported at a radial support 97 provided at the radial outer side of the torsion damper hub 71 via the radial lengthening 78, and the mass arrangement 100 is supported at radial support 97 via the holder 102.

(11) In contrast, FIG. 4 shows a torsional vibration damper 30 in which the mass arrangement 100 also has a radially inwardly extending holder 102 formed by the turbine base 92, but this mass arrangement 100 is not connected directly the output 72 of the torsional vibration damper 30 and, therefore, to the driven side 73 and is merely indirectly connected via the radially inwardly extending radial lengthening 78 of the damper mass carrier element 5a. To this end, a first connection 93 formed by riveting is provided between the holder 102 of the mass arrangement 100 and the radial lengthening 78 of the damper mass carrier element 5a, and a second connection 94 formed by the connection arrangement 77 is provided between the radial lengthening 78 of the damper mass carrier element 5a and the output 72 of the torsional vibration damper 30. Owing to the radial and/or axial offset of the connections 93, 94, the solution according to FIG. 4 is appreciably more compact axially than the solution according to FIG. 1 in which, however, it is sufficient to form only one individual connection in the form of the connection arrangement 77.

(12) As an alternative to the connection of the radial lengthening 78 of the damper mass carrier element 5a and possibly also of the holder 102 of the mass arrangement 100 to the output 72 of the torsional vibration damper 30 by riveting, it is also conceivable to form this connection by teeth 95, 96 as is shown in FIG. 6, where toothing 95 is formed as outer toothing in the radial support 97 at the radial outer side of the torsion damper hub 71 and toothing 96 is formed as inner toothing at the radial lengthening 78 of the damper mass carrier element 5a and possibly also at the holder 102 of the mass arrangement 100. The two toothings 95, 96 are axially secured relative to one another by interference fit 134.

(13) The damping units 68 and 69 are configured as follows: either both damping units 68 and 69 are configured for full load so that they are prevented from running against a rotational angle stop within the torque range delivered by a drive such as an internal combustion engine, or, if one of the damping units 68, 69 is to be configured for partial load, it is ensured that the other damping unit 68, 69 is configured for full load in every case. In particular, when one of the damping units 68, 69 is configured for partial load this damping unit is permitted to reach the associated rotational angle stop within the torque range delivered by the drive so that as soon as this happens the respective component provided on the driven side of the damping unit 68, 69 is driven along in the same motion with the respective component provided on the drive side 18 of the damping unit. Accordingly, in case of damping unit 68, the intermediate transmission 74 is moved with the input 67; on the other hand, in case of damping unit 69 the output 72 is moved with the intermediate transmission 74. However, due to the configuration of the respective other damping unit 68 or 69 for full load, there will still be damping for the damper masses 7 of the damper mass carrier 3.

(14) The configuration of one of the damping units 68 or 69 for partial load can be advantageous, for example, when a damping unit of low stiffness is required for suppressing certain torsional vibrations.

(15) Alternatively, however, other solutions for forming energy storages of damping unit 68 and/or damping unit 69 are also conceivable. Accordingly, FIG. 5a shows the construction of an energy storage 98 in which the individual coils 99seen in extension direction and with the energy storage relaxedare provided with varying distances 104 from one another in different extension zones a to c. Accordingly, multi-stepped characteristic lines can be generated with only one energy storage. Serving the same purpose, i.e., to generate multi-stepped characteristic lines, is the construction of energy storages 98a and 98b shown in FIG. 5b which are arranged coaxial to one another in that energy storage 98a encloses energy storage 98b. In this case, the length of the two energy storages 98a, 98b in the extension direction is unequal so that the shorter energy storage 98b first undergoes deformation when the longer energy storage 98a has been compressed by that amount by which it projected beyond energy storage 98b in relaxed state.

(16) The following pertains to the mass damper system 1: for the sake of better illustrating the damper masses 7 received at the damper mass carrier 3, the damper mass carrier element 5a arranged axially in front of the damper masses 7 in viewing direction is omitted from FIGS. 2 and 3 and only the damper mass carrier element 5b arranged axially behind the damper masses 7 in viewing direction is shown. The damper masses 7 each have guide paths 22 formed in pairs for receiving coupling elements 20 which are formed as rolling elements. The guide paths 22 are configured in such a way that they allow a radial movement of the damper masses 7 relative to the coupling elements 20. The damper masses 7 have stop sides 43 radially inwardly adjoining their circumference sides.

(17) Guide paths 13 having a curved course are provided at the damper mass carrier elements 5a and 5b, also in pairs in each instance. Referring to the view in FIG. 2 or 3, the guide paths 13 each have an initial region 14 in which the respective guide path 13 has the greatest radial distance from a central axis 15 and connection regions 17 which extend circumferentially opposite one another so as to adjoin both sides of the initial region 14. The guide paths 22 provided at the damper masses 7 also have a curved course, each with an initial region 24 in which the respective guide path 13 has the smallest radial distance from the central axis 15 and with connection regions 25 which extend circumferentially opposite one another so as to adjoin both sides of the initial region 14. The guide paths 22 are provided in each instance at both sides of a damper mass center 35 of the respective damper mass. This damper mass center 35 is located in a central extension radius 36 of the damper masses 7 disposed at a distance R1 from the center axis 15 during driving operation. The state of the damper masses 7 during driving operation is shown in FIG. 2 and exists when the mass damper system 1 is operated at a speed at which the centrifugal force exceeds the weight force.

(18) The coupling elements 20 received in the guide paths 13 and 22 extend in each instance on both sides of the respective guide path 22 into the guide paths 13 provided there. In the view according to FIG. 2, the damper masses 7 tend radially outward owing to the centrifugal force so that the coupling elements 20 position themselves in the initial region 24 of the respective guide path 22 in each instance, i.e., in that region having the smallest radial distance from the center axis 15. The coupling elements 20 are supported in the initial region 14 of the damper mass carrier elements 5a and 5b, i.e., in that region having the greatest radial distance from the central axis 15.

(19) The damper masses 7 have in each instance at their radially inner ends a geometric formation 28 having a first contact area 26 in the circumferentially central portion, but second contact areas 27 in the circumferentially outer portions. The first contact area 26 has an area center 37 which divides the first contact area 26 into formation halves 23. This geometric formation 28 cooperates in a manner to be described in the following with stops 31 which are provided radially inside of the damper masses 7 and which are gathered at an annular component part 32.

(20) In circumferential direction between every two damper masses 7, the annular component part 32 has a holder 34 which surrounds a spacer piece 11 so that the holder 34 serves in each instance as a stop receiver 38. Accordingly, the annular component part 32 is received at the damper mass carrier 3 so as to be fixed with respect to rotation relative to it. An annular body 33 extending in circumferential direction acts between every two stop receivers 38 with a stop profile 40. The stop receivers 38 and stop profiles 40 form common stops 31 at the annular component part 32.

(21) When the mass damper system 1 is operated at a speed at which the centrifugal force exceeds the weight force, the damper masses 7 tend radially outward under the influence of centrifugal force so that the coupling elements 20 can be positioned in each instance in the initial region 24 of the respective guide path 22 of the damper masses 7. While torsional vibrations can force deflections of the damper masses 7 in circumferential direction so that the coupling elements 20 are deflected from the initial regions 14, 24 of the guide paths 13, 22 into their connection regions 17, 25, the coupling elements 20 are always restored to the initial position under the influence of centrifugal force as the torsional vibration decays.

(22) On the other hand, when the centrifugal force drops below the weight force, for example, in creep mode of a motor vehicle or when stopping a drive, e.g., an internal combustion engine, the damper masses 7 drop radially inward to occupy the relative position, shown in FIG. 3, with respect to one another and with respect to the damper mass carrier 3. In an operating state of this kind, the two damper masses 7 located radially above the central axis 15 drop radially inward until their stop sides 43 with the relevant formation half 23 of the first contact area 26 for the movement direction come in contact with the associated stop profile 40 of the stop 31 at the annular body 33 of the annular component part 32. If the guide paths 13, 22 should permit a further movement of the damper masses 7 radially downward, this movement will only end when the relevant second circumferential region 27 of the respective damper mass 7 for the movement direction arrives at the holder 34 and, therefore, at the stop receiver 38 of the annular component part 32. The two damper masses 7 located radially below the central axis 15 likewise drop radially inward until their stop sides 43 with the first contact areas 26 which are formed thereon and which are relevant for the movement direction have come in contact with the associated stop profile 40 of stop 31 at annular body 33 of the annular component part 32 and until, in addition, the second contact areas 27 of the respective damper masses 7 which are relevant for the movement direction have come in contact with the corresponding holders 34 and, therefore, with the stop receivers 38 of the annular component part 32. In this way, the two damper masses 7 located radially below the central axis 15 are prevented from coming in contact with one another by their circumference sides 42.

(23) Since the torsional vibration damper 30 is formed with a damping device 70 whose output 72 is connected to a mass damper system 1 as well as to a mass arrangement 100, there is the problem that at certain speeds, for example, within a speed range of between 1,500 and 1,800 revolutions per minute, the deflection angle at the output 72 of the damping device 70 drops sharply even when torsional vibrations are present at the input 67 of the damping device 70. Accordingly, since the output 72 of the damping device 70 stays at least approximately in a vibration node, the vibration excitations which are urgently required for the functioning of damper masses 7 of the mass damper system 1 are very slight. Therefore, it cannot be ruled out that the friction effect existing between the damper mass carrier elements 5a, 5b and the damper masses 7 is sufficient to prevent a deflection of the damper masses 7 relative to the damper mass carrier elements 5a, 5b and, therefore, relative to the damper mass carrier 3. In order to mitigate this problem, it is provided that a contact device 105 is associated with the damper mass carrier elements 5a, 5b and, accordingly, with the damper mass carrier 3 and the at least one damper mass 7, which contact device 105 reduces the hindrances to the deflection of the at least one damper mass relative to the damper mass carrier.

(24) In order to fulfill its purpose, the contact device 105 (see FIG. 1 or 4) is provided at one of the two subassembliesi.e., damper mass carrier elements 5a, 5b and damper mass 7and acts on the respective other subassembly. In a particularly simple configuration, the contact device 105 is achieved through a surface treatment which is preferably carried out by coating the component parts 5a, 5b or 7 of one of the subassemblies or by applying a film to component parts 5a, 5b or 7 of one of the two subassemblies, which serves to reduce the dynamic and static friction values between these subassemblies and, therefore, the friction acting upon the latter. The coatings are not limited to friction-reducing plastics such as PTFE (polytetrafluorethylene) or anti-friction paint; on the contrary, constituents such as graphite, sintered metal or molybdenum can also be used.

(25) Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.