WO2008151594A1

WO2008151594A1 - Device for damping vibrations, particularly a torsional vibration damper

Info

Publication number: WO2008151594A1
Application number: PCT/DE2008/000850
Authority: WO
Inventors: Albert Birk
Original assignee: Luk Lamellen Und Kupplungsbau Beteiligungs Kg
Priority date: 2007-06-13
Filing date: 2008-05-16
Publication date: 2008-12-18
Also published as: DE102008023869A1; DE112008001347A5; DE112008001347B4

Abstract

The invention relates to a device for damping vibrations, particularly a torsional vibration damper, comprising a primary mass unit (3) and a secondary mass (4), which are arranged coaxially to each other and are coupled to each other by means for torque transmission (5.1) and/or damping coupling (5.2), and a unit made of a transducer element (11) and a mass ring (12), which are connected to the primary mass unit (3). The invention is characterized in that the connection of the mass ring (12) and transducer element (11) to the primary mass unit (3) occurs substantially at a common diameter, as viewed in the circumferential direction on the primary mass unit (3).

Description

Device for damping vibrations, in particular a torsional vibration damper

The invention relates to a device for damping vibrations, in particular a torsional vibration damper in the form of a dual-mass flywheel, comprising a primary mass unit and a secondary mass unit, which are arranged coaxially with each other and coupled to each other via means for torque transmission and / or damping coupling, a donor element and a mass ring are rotatably connected to the primary mass unit.

Devices for damping vibrations in the form of torsional vibration dampers, in particular in the form of a so-called dual-mass flywheel, are previously known in a large number of designs from the prior art. These include a split flywheel in the form of a primary flywheel, which, as executable in several parts, is also referred to as a primary mass unit and a secondary flywheel or secondary mass unit, which are arranged coaxially to each other and limited in the circumferential direction relative to each other limited rotation. Primary mass unit and secondary mass unit are coupled to each other via means for torque transmission and / or damping coupling, these means are formed in the simplest case of spring-loaded units, which perform both functions. Furthermore, such devices for damping vibrations in the form of dual-mass flywheels are usually still equipped with a coupling device, wherein a first coupling part is formed by the secondary mass unit or is rotatably connected thereto.

To determine the angle of rotation for monitoring the operation of such devices, a transmitter unit, comprising at least one transmitter element is provided, via which the angle of rotation can be detected. To increase and optimal distribution of the mass a mass ring is provided. Both transmitter unit and mass ring are attached to the primary mass unit. The attachment is usually by material connection by means of welded joints and such that the donor element and the ground ring have joining surfaces which are characterized by different joint diameter of the primary mass unit. Since the transmitter element is arranged on the outer circumference of the primary mass unit due to its function and the mass ring must thereby be arranged further offset inwards in the radial direction, this means that in the case of molded primary mass units due to the shaping, the joining surfaces on the primary mass unit for both functional elements also still viewed in the axial direction in the installed position are arranged other. This offset in the radial and additionally axial direction requires a complex alignment of the individual parts during joining and also two separate joining processes. Also, the joining area is sometimes difficult to access. Since optimizing the mass distribution of the mass ring should be arranged with its mass as possible in the outer diameter of the primary mass unit, the joint area for the donor element is often not far enough away from the encoder, so that functional impairment due to welding distortion can not be excluded.

Another possibility is to connect encoder unit or transmitter element and ground ring as a unit next to each other in the axial direction adjacent to each other and in turn to couple this unit with the primary mass unit. However, this leads to an undesirable increase in the required space to be provided in the axial direction, since each of the components is characterized by a certain thickness.

The invention is therefore based on the object, a device for damping vibrations, in particular a torsional vibration damper of the type mentioned in such a way that creates a relatively simple in terms of installation space and space-saving connection of a unit from a donor element and a ground ring with the primary mass unit can be.

The solution according to the invention is characterized by the features of claim 1. Advantageous embodiments are described in the subclaims.

A device for damping vibrations, in particular a torsional vibration damper or a torsional vibration damper, comprises a split flywheel, which consists essentially of a primary mass unit and a secondary mass unit, which are arranged coaxially with each other and are rotatable in the circumferential direction limited relative to each other. The two masses - primary mass unit and secondary mass unit - are coupled to each other via means for torque transmission and / or damping coupling. Furthermore, the device for Verdrehwinkelerfassung at least one encoder element and a ground ring for increasing the primary mass, donor element and ground ring are rotatably connected to the primary mass unit. According to the invention, the connection between the transmitter and the primary mass unit as well as the primary mass unit and the mass ring each directly and in the circumferential direction of the primary mass unit is substantially on a common joint diameter with the primary mass unit. Preferably, the connection between donor element and Primary mass unit and mass ring and primary mass unit alternately in the circumferential direction.

By arranging and mounting on a common joint diameter, the assembly and the generation of the connection can be considerably simplified. In a particularly advantageous manner, with a similar connection between the transmitter element and the primary mass unit and the mass ring and the primary mass unit, the connections for both can be generated in one operation. Bonded connections, in particular welded connections, are particularly preferably selected.

According to a particularly advantageous embodiment, the donor element and the mass ring are designed as annular abutting elements, one of the two open-edged and circumferentially extending, spaced-apart recesses, which are viewed in the radial direction arranged on a diameter, and the other element projections has, which extend into the mounting position in the device in the open-edge recesses. The extension takes place within the axial and radial extent of the recesses. As a result, both elements - donor element and ground ring - nested in the connection area, whereby the joint areas can be displaced for both in an axial plane, and the size is minimized in the axial direction. Turning is not required by nesting. Further, a centering in the radial direction and circumferential direction between the encoder element and ground ring is possible, so that can be dispensed with additional position allocation measures of these parts in the assembly and production of the connection, in particular welded connection. Furthermore, identical joining conditions are also provided on the primary mass unit with the same joint diameter.

According to a particularly advantageous embodiment, the recesses are each arranged on the inner circumference of Massering or donor element. By analogy, this applies to the projections, which are then respectively arranged on the inner circumference of the encoder element or ground ring. As a result, impairment of the mode of operation of the transmitter element due to welding distortion due to displacement of the connection region in the radial direction to the axis of rotation, in particular when the material connection is selected, can be avoided. Furthermore, the mass of the mass ring can thereby be displaced as far as possible outward in the radial direction. The projections on one element and the connecting regions between the recesses on the other element form respective joining surfaces, which can be aligned depending on the selected connection in the axial or radial direction or inclined thereto. If unsolvable connections in the form of cohesive connections are preferably selected, in particular in the form of welded connections, the arrangement of the joining surfaces on the transmitter element and the mass ring relative to the joining surface on the primary mass unit is characterized by a rectangular impact or an angular impact.

If other types of connection are selected, for example a positive or a positive connection, the joining surfaces are generally formed by surface areas pointing in the axial direction.

By the inventive meshing of the individual components of the assembly of encoder and ground ring optimal integration in the existing space can be realized, which is very short in the axial direction, in particular in terms of the connection area. The connection region is preferably always provided in the region of the outer circumference, but spaced from the actual sensor, so that it is not impaired in terms of its function by any welding distortion. Due to the arrangement of the recesses, which are preferably arranged spaced apart in the circumferential direction at regular intervals and thus with a uniform pitch and are designed to a diameter and the projections which are complementary thereto, wherein the extent in the circumferential direction is equal to or preferably less than is achieved only by this one centering during assembly, it is achieved that on the one hand Massering and donor element in a simple manner with respect to their position to each other positioned and welded when creating a welded joint in a single operation with a device.

The solution according to the invention is explained below with reference to figures. It details the following:

FIG. 1 illustrates a device according to the invention for damping

Vibrations in a view from the front;

FIG. 2 illustrates a view X - X according to FIG. 1 for clarification of FIG

Connection of the donor element to the primary mass; FIG. 3 illustrates a view Y - Y according to FIG. 1 for clarification of FIG

Connection of the mass ring to the primary mass unit.

FIG. 1 shows, in a schematized and highly simplified representation, a detail of a view from the right of an embodiment of a device 1 designed to damp vibrations, in particular a torsional vibration damper in the form of a dual mass flywheel 2. FIGS. 2 and 3 illustrate views X - X, respectively and Y - Y according to FIG. 1 in the form of axial sections made in different directions in the circumferential direction. The following explanations refer to all figures.

The device 1 for damping vibrations is also referred to as a torsional vibration damper or torsional vibration damper. This is preferably a so-called dual mass flywheel 2, which is combined with a clutch. The device 1 comprises a primary flywheel mass, which is fastened to a crankshaft (not shown here) of a prime mover, in particular an internal combustion engine of a motor vehicle, which is referred to as the primary mass unit 3 or input part of the device for damping vibrations 1, and a unit which can be coupled at least indirectly to one of the apparatus 1 Another second flywheel, which is also referred to as secondary mass unit 4. Primary mass unit 3 and secondary mass unit 4 can preferably be made in one piece or else in several parts and are coupled to one another via means 5.1 for transmitting torque and means 5.2 for damping coupling. In the simplest case, the functions of the torque transmission and the damping coupling are taken over by the same elements, for example, as energy storage units in the form of elastic spring units 6, which are arranged between primary mass unit 3 and secondary mass unit 4 in the circumferential direction, primary mass unit 3 and secondary mass unit 4 in the circumferential direction against each other support, and allow a rotation between the primary mass unit 3 and secondary mass unit 4 in the circumferential direction limited to each other. Preferably, in the dual mass flywheel 2, the primary mass unit 3 by means of a bearing 7, for example in the form of a sliding bearing in the secondary mass unit 4 coaxially and rotatably supported about the rotation axis R. The secondary mass unit 4 is rotatably coupled to an input part 8, not shown here, a coupling device 9, not shown here, or forms this. The means 5.1, 5.2 for torque transmission and damping clutch can be designed in various ways, in particular with regard to the damping concept used. It is crucial that both a torque is transmitted over this and also vibrations are damped. If both functions are combined, these are taken over in the simplest case by spring units 6 extending in the circumferential direction and supported on the primary mass unit 3 and the secondary mass unit 4 with a large compression path. Conceivable, in addition to a purely mechanical damping concept, for example, a design with hydraulic damping concept, wherein the hydraulic damping means in addition to the means 5.1 for torque transmission, which can then also be designed as spring units 6, are provided. In this case, but not shown here, be provided with a damping medium fillable chambers between primary mass unit 3 and secondary mass unit 4.

The primary mass unit 3 is in the illustrated case at least in two parts and comprises a first primary part 14 and a second primary part 15, wherein the first primary part 14 and the second primary part 15 are rotatably connected to each other and enclose an inner space 16 in the axial direction and in the circumferential direction. The first primary part 14 forms a first housing part, the second primary part 15 a second housing part in the form of a cover element 17. In the enclosed interior 16, the means 5.1 for torque transmission and 5.2 are integrated for damping coupling.

The device 1 for damping vibrations further comprises a transmitter unit 10, comprising a transmitter element 11 for detecting a twist angle. The transmitter element 11 is connected in a rotationally fixed manner to the primary mass unit 3. To increase the mass of the primary mass unit 3, a mass ring 12 is provided. The mass ring 12 and the encoder element 11 are rotatably connected to the primary mass unit 3. The design and arrangement of the encoder element 11 and ground ring 12 takes place in the radial direction in the region of the outer circumference 13 of the primary mass unit 3. The connection is made cohesively, preferably by welded joints. Massering 12 and donor element 11 according to the invention are both connected to the primary mass unit 3 in the region of a common joint diameter dF. For this purpose, the encoder element 10 and ground ring 12 are arranged coaxially to each other and viewed in the axial direction intermeshing, wherein one of the two components extends partially over a portion of the axial extent of the other component. As a result, a kind of nesting is achieved in the area of a rotationally fixed connection with the primary mass unit 3 can be made. The connection of the unit 19 thus produced by nesting is preferably carried out by material-locking ge compounds 20.1 to 20. n, preferably in the form of welded joints between the transmitter element 11 and primary mass unit 3 and cohesive connections 23.1 to 23. n between ground ring 12 and primary mass unit 3, also preferably in the form of welded joints. According to the embodiment of the invention, one of the two elements of the unit 19, donor element 10 or ground ring 12, recesses or Ausklingungen 21, protrude into the complementarily designed projections 22 on the other part. Both elements of the unit 19 are connected at the same height and in the same diameter dF with the primary mass unit 3 at its joining surface F3, preferably welded. This offers the advantage that on the one hand both parts of the unit 19, encoder element 10 and ground ring 12, at the same time with the primary mass unit 3, in particular the cover 17 aligned, inserted and welded to each other and the individual welds 20.1 to 20. n and 23.1 and 23. n can be generated in a manufacturing process with a welding tool sequentially or simultaneously in the circumferential direction.

From the figures 2 and 3 in the form of the axial sections according to the views X - X and Y - Y of Figure 1 it can be seen that the material-locking connections 20.1 to 20. n for the encoder element 10 takes place at the same diameter dF, as the cohesive connection 23.1 to 23. n in the form of the welded joints between the mass ring 12 and primary mass unit 3. By interleaving the compounds in the circumferential direction considered alternately. Preferably, a recess 21 is always sized in terms of their extent in the circumferential direction, that this at least one projection 22 receives. It is also conceivable to arrange the projections 22 adjacent to one another such that two can also extend into a recess 21.

Furthermore, it can be seen that the encoder element 10 is formed as an annular disk-shaped, viewed in cross-section bent sheet metal element having a cylindrical portion 24, which is viewed in the radial direction on the outer circumference 25 is executed and also a flange-like radially oriented portion 26 which a Surface region 27 which reaches the second primary part 15 at a directed thereto complementary surface area 28 to the concern. Furthermore, the projections 22 are provided, which extend on the inner circumference di11 in the axial direction in the direction of the recesses 21 on the mass ring and extend in these in the radial direction in the direction of the axis of rotation R. Furthermore, the mass ring 12 has a cylindrical portion 29, and a drawn in the radial direction in the direction of the axis of rotation R flat disc-shaped portion 30 which a stop or contact surface 31 for forms a contact surface 32 on the encoder element 10. On the inner circumference di12 the open-edged recesses or recesses 22 are provided.

In a particularly advantageous manner, the recesses 21 are arranged in the circumferential direction in each case with a constant extent in the circumferential direction and with the same pitch to each other. This applies analogously to the projections 22, whereby any assignment in the circumferential direction between the mass ring 12 and the encoder element 11 is possible.

FIG. 3 illustrates the embodiment of the projections 22 on the encoder element 10 for projecting into the recesses or extensions 21 on the ground ring 12. The projections 22 are designed in such a way that they act with their surface 33 pointing in the radial direction, which acts as a joining surface F11 in the case of material-locking connection are arranged approximately to a diameter dF, as well as the smallest diameter which describes the inner circumference di12 of the mass ring 12 and which forms joining surfaces 34 on its surface 34 facing the axis of rotation R. This makes it possible, in the radial direction to the rotation axis R pointing and by the, the inner circumference di11, di12 descriptive surfaces formed, which act at least partially as joining surfaces F11, F12, for adhering a cohesive connection medium, as far away from the donor element 11 place and further connect to the primary mass unit 3 at a diameter dF. Furthermore, it is possible to weld transducer element 10 and ground ring 12 with the primary mass unit 3, as it were, alternately, with the material-locking connection preferably taking place on the common diameter dF, so that these cohesive connections can be produced with a single welding apparatus in a welding process. Furthermore, by the interlacing of the encoder element 10 and ground ring 12 a short construction in the axial direction in the connection area is realized. The connections between the ground ring 12 and the encoder element 10 are quasi in one plane when viewed in the circumferential direction. Depending on the dimensions and geometry, the configuration of the encoder element 10 and the ground ring 12, in particular in their flange regions 33 and 34, which are respectively formed by the cylindrical regions 29, 24 adjoining areas 30 and 26, the position of the cohesive connection varies become. Preferably, a diameter is selected with regard to the diameter dF, which on the one hand enables the integral connection as far away from the transmitter element, so that this function is not affected by welding distortion, but furthermore the mass ring 12 by an arrangement of the mass as far as possible in the radial direction is characterized on the outer circumference 13. This means that the unit 19 in the is arranged rich of the outer periphery 13 of the device 1 for damping vibrations, in particular in the region of the outer periphery of the second primary part 15th

Due to the meshing, the position of the encoder element 10 and ground ring 12 is centered in the radial direction and also in the circumferential direction relative to one another. In this case, viewed in the circumferential direction, the recess 21 may be formed on the mass ring 12 such that it extends in the circumferential direction over an extension b, which is the same, but preferably greater than the extension of the projection on the encoder element 10 in the circumferential direction. A direct positive connection is not achieved here. Only the connection region for the transmitter element is displaced viewed in the axial direction into the connection region for the mass ring 12.

The solution according to the invention is not limited to a specific embodiment of a device 1 for damping vibrations. However, this is preferably in a so-called two-mass flywheel, comprising a primary mass unit 3 and a secondary därasseneinheit 4 and 5.1, 5.2 for transmitting torque and damping coupling coupled to the secondary mass unit 4 coupling device, the secondary mass unit 4 either part of the coupling device, in particular a first Coupling is or this wears used.

Furthermore, the solution according to the invention is not limited to a specific embodiment of the means 5.1, 5.2 for torque transmission and damping coupling. The means for torque transmission and thus spring coupling are usually formed by spring units, which in addition can also take over the function of the damping elements. On the other hand, it is also conceivable to realize the function of the damping via other mechanisms, for example via additional friction damping between the circumferentially relatively limited rotatable masses - primary mass unit 3 and secondary mass unit 4 - or for example in embodiments with hydraulic damping in the form of damping chambers.

According to the invention, the connections between transmitter element 11 and primary mass unit 3 and mass ring 12 and primary mass unit 3 in a particularly advantageous manner, since easy to manufacture with high strength designed as welded joints. It would also be conceivable to use other types of connection, in particular positive or non-positive connections. applications, which can then be realized on the adjacent surface areas of the encoder element 11 and mass ring 12 on the primary mass unit 3.

LIST OF REFERENCE NUMBERS

1 Device for damping vibrations

2 dual mass flywheel

3 primary mass unit

4 secondary mass unit

5.1 means for torque transmission

5.2 Means for damping coupling

6 elastic spring unit

7 bearings

8 input part

9 coupling device

10 encoder units

11 encoder element

12 massaging

13 outer circumference

14 first primary part

15 second primary part

16 interior

17 cover element

18 housing

19 unit

20.1 - 2O.n cohesive connection

21 recesses / notches

22 protrusions

23.1 - 23.n cohesive connection

24 cylindrical area

25 outer circumference

26 area

27 surface area

28 area area

29 cylindrical area

30 area

31 contact surface

32 contact surface

33 flange area 34 flange area

R rotation axis

F11 joining surface

F3 joining surface

F12 joining surface di11 inner circumference di12 inner circumference

Claims

claims

1. Device for damping vibrations, in particular torsional vibration damper in the form of a dual-mass flywheel, comprising a primary mass unit (3) and a secondary mass unit (4), which are arranged coaxially to each other and via means for torque transmission (5.1) and means for damping coupling ( 5.2) are coupled together, a donor element (11) and a mass ring (12) which are rotatably connected to the primary mass unit (3), characterized in that the compound of mass ring (12) and donor element (11) each directly to the primary mass unit (3) takes place in the circumferential direction on the primary mass unit (3) essentially on a common joint diameter (dF) on the primary mass unit (3).

2. Device (1) according to claim 1, characterized in that the transmitter element (11) and the ground ring (12) are designed as annular elements, one of the two open-edged and extending in the circumferential direction, spaced-apart recesses (21), when viewed in the radial direction are arranged on a diameter (dF), and the respective other element projections (22) which extend into the mounting position in the device (1) in the open-edged recesses (21).

3. Device (1) according to claim 2, characterized in that the recesses

(21) in each case on the inner circumference (di12, di11) of the mass ring (12) or donor element (11) are arranged.

4. Device (1) according to claim 2 or 3, characterized in that the projections

(22) respectively on the inner circumference (di11, di12) of the encoder element (11) or ground ring (12) are arranged.

5. Device (1) according to one of claims 2 to 4, characterized in that the projections (22) and / or recesses (21) in the circumferential direction of the individual elements - donor element (11) and ground ring (12) - each with a constant Division are arranged.

6. Device (1) according to one of claims 2 to 4, characterized in that the projections (22) and / or recesses (21) in the circumferential direction of the individual Elements - donor element (11) and ground ring (12) - are each arranged with different pitch.

7. Device (1) according to one of claims 2 to 6, characterized in that in each case the projections (22) and lying between the open-edged recesses (21) areas at least partially facing in the radial direction joining surfaces (F11, F12) on the two Elements - donor element (11) and ground ring (12) - form.

8. Device (1) according to claim 7, characterized in that the joining surfaces (F11, F12) are aligned parallel to the axis of rotation (R) of the device (1).

9. Device (1) according to claim 7, characterized in that the joining surfaces (F11, F12) inclined to the rotation axis (R) of the device (1) are aligned.

10. Device (1) according to one of claims 2 to 9, characterized in that the joining surfaces (F11, F12) of the encoder element (11) and / or ground ring (12) viewed in the circumferential direction on a common diameter (dF) are.

11. Device (1) according to one of claims 2 to 10, characterized in that the joining surfaces (F11, F12) of the encoder element (11) and / or ground ring (12) in the axial direction in the installed position are characterized by the same axial extent.

12. Device (1) according to one of claims 2 to 11, characterized in that the projections (22) are formed as extending in the axial direction and in the radial direction to the rotation axis (R) directed projections.

13. Device (1) according to one of claims 1 to 12, characterized in that the mass ring (12) and the donor element (11) are formed as annular elements with L-shaped cross-sectional area, wherein the aligned in the radial direction regions in the axial direction pointing stop surfaces (31, 32) form to abut each other.

14. Device (1) according to any one of claims 1 to 13, characterized in that the joint diameter (dF) in the region of the outer diameter (13) of the primary mass unit (3).

15. Device (1) according to one of claims 1 to 14, characterized in that the compounds are designed as cohesive connections.

16. Device according to one of claims 1 to 15, characterized in that the compounds are designed as welded joints (20.1 to 20. n, 21.1-21. N).

17. Device (1) according to one of claims 1 to 16, characterized in that the secondary mass unit (4) carries a coupling part (8) of a coupling device (9) or forms this.