Spoke damper

Abstract

The invention relates to a spoke damper, comprising at least one first damper device (2) which has a first inner ring portion (3), a first outer ring portion (4), and a plurality of first spoke portions (5) extending from the first inner ring portion (3) to the first outer ring portion (4); and a second damper device (7) which has a second inner ring portion (8), a second outer ring portion (9), and a plurality of second spoke portions (10) extending from the second inner ring portion (8) to the second outer ring portion (9). The first damper device (2) is connected, in the region of the first inner ring portion (3), to an annular hub component (6), and the second damper device (7) is connected, in the region of the second inner ring portion (8), to an annular mass component (11), the first and second damper device (2, 7) being connected together in the region of the two outer ring portions (4, 9) thereof.

Description

[0001] spoke damper

[0002] The invention relates to a spoke damper.

[0003] A spoke damper of this type, as known, for example, from DE 10 2022 104 006 A1, is a ring-shaped structure with an inner ring section, an outer ring section, and several spoke sections extending between the two rings, which act as springs. The spoke damper serves to dampen rotational irregularities in a rotating system, such as an internal combustion engine. The spoke damper is attached to a rotating shaft, such as the crankshaft of an internal combustion engine, by means of its inner ring section; it therefore rotates with the shaft. In the event of rotational irregularities, the circumferential spacing of the outer ring section from the inner ring section via the spokes, and the moment of inertia of the outer ring section, result in a slight rotation of the inner ring section relative to the outer ring section, thereby damping the vibrations.Such a spoke damper is usually manufactured by stamping a sheet of metal.

[0004] Due to radial space constraints, the spoke sections cannot be designed to be arbitrarily long. Furthermore, the geometric design possibilities for the spoke sections are limited, as manufacturing restrictions apply. On the one hand, the spoke sections must be designed to be manufactured using the stamping process, and on the other hand, any material stresses must not exceed critical levels. Therefore, the design is limited by the stiffness of the spoke sections, i.e., their springs, and by the swivel angle.

[0005] The invention is based on the problem of providing an improved spoke damper in comparison.

[0006] To solve the problem, the invention provides a spoke damper comprising at least one first damper device comprising a first inner ring section and a first outer ring section as well as several first spoke sections extending from the first inner ring section to the first outer ring section, and a second damper device comprising a second inner ring section and a second outer ring section as well as several second spoke sections extending from the second inner ring section to the second outer ring section, wherein the first damper device is connected in the region of the first inner ring section to an annular hub component and the second damper device is connected in the region of the second inner ring section to an annular mass component, and wherein the first and the second damper devices are connected to each other in the region of their two outer ring sections.

[0007] The spoke damper according to the invention is a multi-part damper consisting of at least two separate damper devices. According to the invention, these are connected in series, so that the spoke sections, i.e., the springs of the two damper devices, interact in a series connection. This results in the overall elongation being greater than the elongation of each individual spoke section or spring, and the overall characteristic curve of the spoke damper being softer than that of the individual springs or spoke sections.

[0008] The first damper device comprises a first inner ring section and a first outer ring section. Several first spoke sections extend between these two. Similarly, the second damper device has a second inner ring section and a second outer ring section, between which several second spoke sections extend. The first damper device is connected to a hub component, while the second damper device is connected to a mass component; that is, the first damper device is connected to the primary mass, while the second damper device is connected to the secondary mass. The first outer ring section, in turn, is connected to the second outer ring section, thus directly mechanically coupling the two damper devices to each other.Consequently, an applied torque is transferred from the hub component to the first inner ring section, from there to the first spoke sections, and from these to the first outer ring section. Since this outer ring section is connected to the second outer ring section, the torque is then transferred to the second outer ring section, from there to the second spoke sections, and from these in turn to the second inner ring section, which is coupled to the mass component, i.e., the secondary mass. Thus, the first and second spoke sections are clearly connected in series, so that the respective elongations of the first and second spoke sections result in a total elongation and a common damping characteristic.

[0009] The design of the spoke damper according to the invention allows, firstly, a significant reduction in the radially required installation space, resulting from the series connection of the two damper devices. Furthermore, the overall characteristic curve can be designed accordingly by appropriately sizing the individual damper devices or the respective spoke sections, which in turn allows the individual spoke sections to be subject to far fewer geometric restrictions than in known spoke dampers.

[0010] As described, the first damper device is connected to the hub component. This mechanical connection is preferably made via first rivet or bolt connections. The second damper device is connected to the mass component. This mechanical connection is also preferably made via second rivet or bolt connections. The two damper devices themselves are connected to each other in the area of ​​the outer ring sections via corresponding spacer bolt connections. The two outer ring sections are axially spaced from each other, which ensures that each damper device is arranged in one plane, i.e., that the two damper devices are slightly spaced from each other axially as a result of their connection to the primary and secondary masses. To prevent the spoke sections from experiencing even slight axial bending, the outer ring sections are axially spaced accordingly via the spacer bolt connections.

[0011] To connect the individual elements to one another, the first inner ring section can have initial connection openings through which the rivets or bolts forming the first rivet or bolt connections penetrate, just as the second inner ring section can have secondary connection openings through which the second rivets or bolts forming the second rivet or bolt connections penetrate. The inner ring sections are therefore, radially speaking, sufficiently wide so that corresponding openings for receiving the rivets or bolts for connection to the hub component or the mass component can be formed directly on them.

[0012] The first outer ring section can also have openings for the spacers, and the second outer ring section can have openings for the spacers, both of which are penetrated by the spacers. This also requires that both outer ring sections have a sufficient radial width to allow for the formation of the corresponding openings. However, if the outer ring sections are relatively narrow, it may be possible to provide radially inwardly extending ring sections on the first and / or second outer ring section, in which the first and / or second spacer openings are located. Thus, the first and / or second outer ring section has tab-like ring sections that extend radially towards it and in which the spacer openings are provided.It is conceivable that the two damping devices are geometrically identical in the area of ​​the outer ring sections, so that both are provided with corresponding ring sections that are congruent with each other. However, identical design is not mandatory, since, as will be discussed below, the two damping devices may also be designed somewhat differently with regard to their vibration behavior, so that the corresponding geometries in the area of ​​the two outer ring sections may also differ.

[0013] As described, the first and second damper devices can each be formed by a single damper element consisting of a stamped sheet metal component comprising an inner ring forming the inner ring section, several spokes forming the spoke sections, and an outer ring forming the outer ring section. This means that each damper device consists of a single such stamped sheet metal component, i.e., it is only single-layered.In contrast, a further development provides that the first damper device consists of at least two first damper elements, each of which has a first inner ring and a first outer ring as well as first spokes extending from the first inner ring to the first outer ring, wherein the first damper elements are arranged axially congruently on top of each other, and / or that the second damper device consists of at least two second damper elements, each of which has a second inner ring and a second outer ring as well as second spokes extending from the second inner ring to the second outer ring, wherein the second damper elements are arranged axially congruently on top of each other.According to this embodiment of the invention, the first damper device, the second damper device, or both damper devices each consist of several separate damper elements; the first damper device consists of two or more first damper elements, and the second damper device consists of two or more second damper elements. Each of these damper elements has an inner ring and an outer ring, as well as spokes extending between them. The first damper elements or the second damper elements are arranged axially one above the other, thus forming a corresponding assembly that is firmly connected to one another via the appropriate rivet or bolt connections or spacer bolt connections, resulting in a corresponding unit. At least two such disc-shaped first or second damper elements can be provided, and of course, more damper elements per damper device can also be provided.The vibration behavior of the respective damper device can also be varied by adjusting the number of individual damper elements.

[0014] It is conceivable that the first and second damping devices have the same natural frequencies. That is, the two damping devices are ultimately identical in design, both in terms of the number of damping elements and their geometric layout, and in particular the design of the respective spokes or spoke sections. Alternatively, however, it is also conceivable that the first and second damping devices have different natural frequencies.

[0015] This means they exhibit different vibration behavior within the frequency range under consideration. This variation in natural frequencies can be achieved through various measures. These measures include, for example, a different number of damping elements per damping device and / or differently designed first and second damping elements. Another measure can be a different design of the first and second spokes or the first and second spoke sections, both in terms of spoke width and spoke length. This means that the first spoke sections and the second spoke sections can also be geometrically different. By appropriately varying the vibration behavior of the two damping devices, the overall characteristic curve can therefore be further influenced.

[0016] As described, the two outer ring sections are axially spaced apart by means of the spacer bolts. It is possible to arrange one or more rings, serving as additional mass, on these spacer bolts. Such a ring, which is attached via the spacer bolts and extends around the entire circumference, serves as an additional mass, thus increasing the overall weight of the respective damper device and thereby introducing corresponding additional mass into the system. Such a ring can be assigned to only one damper device, or to both.

[0017] In a further development of the invention, it can be provided that a first friction device (38) is provided on the first damping device (2) and / or a second friction device (42) is provided on the second damping device (7), via which a damping frictional torque is generated during an oscillation. Via these friction devices, of which only one or both may be provided, a frictional torque can be generated during an oscillation of the system, which additionally has a damping effect.

[0018] The first friction device may comprise an annular first inner friction disc, which is fixed in the area of ​​the first inner ring section, and an annular outer first friction disc adjacent to it, which is fixed in the area of ​​the first outer ring section, and / or the second friction device may comprise an annular second inner friction disc, which is fixed in the area of ​​the second inner ring section, and an annular second outer friction disc adjacent to it, which is fixed in the area of ​​the second outer ring section, wherein the respective friction discs of each friction device generate a frictional torque during an oscillation.

[0019] The invention is explained below with reference to exemplary embodiments and the drawings. The drawings are schematic representations and show:

[0020] Figure 1 is a perspective view of a spoke damper according to the invention, Figure 2 is a partial perspective view of the spoke damper from Figure 1, cut along line 11-12 in Figure 1,

[0021] Figure 3 is a perspective partial view of the spoke damper from Figure 1, cut along the line Ill-Ill in Figure 1.

[0022] Figure 4 shows a cutaway perspective view of a spoke damper of a second embodiment according to the invention, and

[0023] Figure 5 shows a cutaway perspective view of a spoke damper of a third embodiment according to the invention with integrated friction devices.

[0024] Figure 1 shows a perspective view of a spoke damper 1 according to the invention. This comprises a first damper device 2, comprising a first inner ring section 3 and a first outer ring section 4, with a plurality of individual spoke sections 5 extending between these. The inner ring section 3 is connected to a hub component 6, which will be described in detail below.

[0025] The spoke damper 1 comprises a second damper device 7, comprising a second inner ring section 8 and a second outer ring section 9, between which a plurality of individual spoke sections 10 extend. The inner ring section 8 is connected to a mass component 11, which will also be described in detail below.

[0026] Furthermore, the first outer ring section 4 is mechanically fixed to the second outer ring section 9, which will also be discussed below.

[0027] The two damping devices 2, 7 are arranged concentrically to each other and are therefore rotatable about a common axis of rotation. A torque to be damped is introduced via the hub component 6 and received by the first inner ring section 3 and transmitted to the first spoke sections 5 and from these to the first outer ring section 4. Since this is mechanically fixed to the second outer ring section 9, as described, the torque is transferred to this and from it in turn to the second spoke sections 10 and finally to the second inner ring section 8, from which it is transmitted to the mass component 11. The hub component 6 is part of the primary mass, while the mass component 11 is part of the secondary mass.

[0028] Figure 2 shows a sectional view along line 11-11. The section plane passes through a first spoke section 5 and a second spoke section 10, which are axially congruent. The section plane also passes through the fastenings by which the two damper devices 2, 7 are connected to the hub component 6 and the mass component 11. The first inner ring section 3 is connected to the hub component 6 via first rivet or bolt connections 12. For this purpose, openings 13 are provided in the hub component 6. Connecting openings 14 are provided in the first inner ring section 3, which are congruent with the openings 13, so that the respective rivet or bolt 15 engages through both and connects the two components to each other by means of one-sided heads 16, 17.

[0029] The connection of the second inner ring section 8 to the solid component 11 via second rivet or bolt connections 23 is also shown. The solid component 11 also has openings 18 for this purpose, which are aligned with the connecting openings 19 provided on the second inner ring section 8. A respective rivet or bolt 20 engages through the openings 18 and the connecting openings 19 and connects both elements via corresponding heads 21, 22.

[0030] As shown in Figure 1, the corresponding rivet or bolt connections are arranged equidistantly around the circumference.

[0031] Figure 2 further shows in detail that the first damper device 2 consists of several separate, disc-shaped first damper elements 24, which are stamped from a corresponding sheet of metal. Each damper element 24 has a first inner ring 25, first spokes 26, and a first outer ring 27. The damper elements 24 are arranged axially one above the other, such that the first inner rings 25 form the inner ring section 3, the individual spokes 26 the respective spoke section 5, and the outer ring sections 27 the respective outer ring section 4. Similarly, the second damper device 7 is also formed from several separate, disc-shaped second damper elements 28. Each damper element 28 comprises an inner ring 29, several spokes 30, and an outer ring section 31.The second damper elements 28 are also axially superimposed, so that the second inner ring 29 form the second inner ring section 8, the individual spokes 30 the respective spoke sections 10 and the individual second outer rings 31 the outer ring section 9.

[0032] Figure 3 shows a sectional view along line 13-13 from Figure 1. This section plane passes through the junction of outer ring sections 4 and 9 and shows the spacer bolt connections 45. Outer ring section 4 has first spacer bolt openings 32, meaning that each first outer ring 31 has a corresponding opening. The second outer ring section 9 has corresponding second spacer bolt openings 33, meaning that each second outer ring 31 has corresponding openings. A spacer bolt 34 extends through the aligned spacer bolt openings 32, 33. This spacer bolt has a radially widened central section 35 against which the outer ring sections 4, 9 are supported on both sides, and which is clamped on both sides via corresponding heads 36, 37. The spacer bolts 34 are also positioned equidistantly around the circumference.This creates a fixed mechanical connection between the two damping devices 2 and 7 in the area of ​​the outer circumference, so that the two damping devices 2 and 7 are connected in series and a torque introduced at the first damping device is transferred from the first damping device to the second damping device and dissipated from it. In this way, any rotational irregularities or irregularities in torque resulting from the vibration characteristics of the two damping devices 2 and 7 are damped. Because they are connected in series, these vibration characteristics define an overall characteristic curve.

[0033] Figure 4 shows a second embodiment of a spoke damper 1 according to the invention, wherein the same reference numerals are used for identical components. The construction is identical to the embodiment described above. Here, compared to the embodiment according to Figure 3, two rings 46, 47 are attached to the spacer bolts 34, via which an additional mass is arranged on the first and second damper devices 2, 7.

[0034] Figure 5 showed an embodiment of a spoke damper 1 according to the invention, the construction of which corresponds to that shown in Figures 1-3. In addition, the first damper device 2 here has a first friction device 38 comprising a first inner friction disc 39. The friction disc 39 is fixed to the inner circumference by means of the first rivet or bolt connections 12. Furthermore, the friction device comprises a first outer friction disc 41, which is fixed to the outer circumference by means of the spacer bolt connections 45 and which overlaps and bears against the friction disc 39 on its outer side.

[0035] Similarly, the second damper device 7 also has a second friction device 42, comprising a second inner friction disc 43, which is likewise fixed to the inner circumference via the second rivet or bolt connections 23. A second outer friction disc 44 is also provided, which is likewise fixed via the spacer bolt connections 45 and bears axially against the second friction disc 43.

[0036] If the spoke sections 5 and 10 vibrate, they move relative to each other with respect to the two friction discs of each friction device 38, 42, resulting in friction which in turn has a damping effect. The overall damper characteristic can therefore also be influenced via the corresponding friction devices.

[0037] List of reference signs

[0038] spoke damper

[0039] Damper device

[0040] inner ring section

[0041] outer ring section

[0042] spoke sections

[0043] Hub component

[0044] Damper device

[0045] inner ring section

[0046] outer ring section

[0047] spoke sections

[0048] Mass component

[0049] rivet or bolt connection

[0050] Breakthrough

[0051] Connection breach

[0052] bolt

[0053] Head

[0054] Head

[0055] Breakthrough

[0056] Connection breach

[0057] rivet or bolt

[0058] Head

[0059] Head

[0060] bolted connection

[0061] Tuning element

[0062] inner ring

[0063] spoke

[0064] outer ring section

[0065] Tuning element

[0066] inner ring

[0067] spoke

[0068] Outer ring spacer bolt opening

[0069] Spacer bolt penetration

[0070] Spacer bolts

[0071] Middle section

[0072] Head

[0073] Head

[0074] Friction device

[0075] friction disc

[0076] friction disc

[0077] Friction device

[0078] friction disc

[0079] friction disc

[0080] Standoff bolt connection

[0081] ring

[0082] ring

Claims

Patent claims 1. Spoke damper, comprising at least a first damper device (2) comprising a first inner ring section (3) and a first outer ring section (4) as well as several first spoke sections (5) extending from the first inner ring section (3) to the first outer ring section (4) and a second damper device (7) comprising a second inner ring section (8) and a second outer ring section (9) as well as several second spoke sections (10) extending from the second inner ring section (8) to the second outer ring section (9), wherein the first damper device (2) is connected in the region of the first inner ring section (3) to an annular hub component (6) and the second damper device (7) is connected in the region of the second inner ring section (8) to an annular mass component (11), and wherein the first and the second damper devices (2, 7) are connected to each other in the region of their two outer ring sections (4, 9).

2. Spoke damper according to claim 1, characterized in that the first damper device (2) is connected to the hub component (6) via first rivet or bolt connections (12) and / or the second damper device (7) is connected to the mass component (11) via second rivet or bolt connections (23) and / or the two damper devices (2, 7) are connected to each other via spacer bolt connections (45).

3. Spoke damper according to claim 2, characterized in that the first inner ring section (3) has first connection openings (14) which are penetrated by the rivets or bolts (15) forming the first rivet or bolt connections (12), and / or the second inner ring section (8) has second connection openings (19) which are penetrated by the second rivets or bolts (20) forming the second rivet or bolt connections (23).

4. Spoke damper according to claim 2 or 3, characterized in that the first outer ring section (4) has first spacer bolt openings (32) and the second outer ring section (9) has second spacer bolt openings (33) has sections through which the spacer bolts (34) penetrate, or that radially inwardly extending ring sections (46) are provided on the first outer ring section and / or on the second outer ring section, in which the first and / or the second spacer bolt openings (32, 33) are provided.

5. Spoke damper according to one of the preceding claims, characterized in that the first damper device (2) consists of at least two first damper elements (24), each of which has a first inner ring (25) and a first outer ring (27) as well as first spokes (26) extending from the first inner ring (25) to the first outer ring (26), wherein the first damper elements (24) are arranged axially congruently to one another, and / or that the second damper device (7) consists of at least two second damper elements (28), each of which has a second inner ring (29) and a second outer ring (31) as well as second spokes (30) extending from the second inner ring (29) to the second outer ring (31), wherein the second damper elements (28) are arranged axially congruently to one another.

6. Spoke damper according to one of the preceding claims, characterized in that the first damper device (2) and the second damper device (7) have the same or different natural frequencies.

7. Spoke damper according to one of the preceding claims, characterized in that the number of first damper elements (24) corresponds to the number of second damper elements (28), or that the number of first damper elements (24) and the number of second damper elements (28) are different, and / or that the first spoke sections (5) and the second spoke sections (10) are geometrically identical or different.

8. Spoke damper according to one of the preceding claims, characterized in that one or more rings (46, 47), which serve as an additional mass, are arranged on the spacer bolts (34).

9. Storage damper according to one of the preceding claims, characterized in that a first friction device (38) and / or a second friction device (42) is provided on the first damper device (2), via which a damping friction moment is generated during an oscillation.

10. Spoke damper according to claim 9, characterized in that the first friction device (38) comprises an annular first inner friction disc (39) which is fixed in the region of the first inner ring section (3), and an annular outer first friction disc (41) abutting this, which is fixed in the region of the first outer ring section (4) is fixed, and / or the second friction device (42) comprises an annular second inner friction disc (43) which is fixed in the region of the second inner ring section (8), and an annular second outer friction disc (44) adjoining this, which is fixed in the region of the second outer ring section (9), wherein the respective friction discs of each friction device (38, 42) generate a frictional torque during an oscillation.

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