DE102022124871A1 - Assembly with damping ring for unit mounting - Google Patents

Abstract

The invention proposes an assembly (2) comprising an assembly (4) and at least one damping ring (6), the damping ring (6) comprising a support ring (8) which carries an inner radial elastomer ring (10) and an outer radial elastomer ring (12). , wherein the unit (4) is stored or can be stored exclusively by means of the at least one damping ring (6).

Description

The invention relates to an assembly according to claim 1 and a use according to claim 10.

Assemblies are known that include an aggregate, such as a pump, and an aggregate bearing. By means of storage, the aggregate can be stored on a storage structure. The bearings installed there are usually formed from a rubber ring that is arranged on the circumference of the unit or its housing.

Due to the arrangement of the well-known rubber ring on the unit housing, the thrust track of the rubber ring in the torsional direction (axial direction) has a large lever arm, which results in high torsional rigidity. Due to the space available, such rubber rings are usually far away from the rotation axis of the unit, so that they are comparatively stiff around the rotation axis due to the large lever arm in the torsional direction. However, this is negative for satisfactory vibration decoupling. This high rigidity results in poor decoupling in the torsional direction.

The object of the invention is therefore to improve the above-mentioned prior art, in particular with regard to the aspects described.

Main features of the invention are specified in claims 1 and 10. Embodiments are the subject of claims 2 to 9.

According to the invention, an assembly is therefore proposed, comprising an aggregate and at least one damping ring, the damping ring comprising a support ring which carries an inner radial elastomer ring and an outer radial elastomer ring, the aggregate being supported or storable exclusively by means of the at least one damping ring.

The damping ring, which can be an elastic bearing ring, serves to decouple the vibrations of the unit from a bearing structure, such as a vehicle. The damping ring is arranged between the unit and the bearing structure. It is conceivable that the assembly also includes a storage structure. To achieve the best possible decoupling, a central longitudinal axis can therefore be arranged centrally to the damping ring(s). The torsional rigidity of the damping ring can coincide with the central longitudinal axis.

The damping ring, in which the support ring separates two elastomer rings in the radial direction, has a significantly positive effect on the stiffness behavior. The damping ring is therefore very soft in the torsional direction. The stiffness ratio of torsional stiffness to radial stiffness can be reduced by at least a factor of 3. According to the invention, the unit is also supported or can be supported using at least one damping ring. This results in a combinatorial effect, because decoupling in the torsional direction can now take place at comparatively low frequencies. The frequency of the eigenform with rotational movement around an axis in the longitudinal direction of the unit is then minimized and improved. In addition, the damping ring can be manufactured inexpensively and takes up little installation space.

The advantage of the reduction in stiffness in the torsional direction through the support ring is advantageously not accompanied by a disadvantage in stiffness in another spatial direction. Since elastomer is almost incompressible, when the damping ring is subjected to pressure in the radial direction, the free surfaces of the corresponding elastomer ring bulge. The support ring hinders movement with pressure/tension loads. The torsional rigidity, on the other hand, only causes shear stress on the corresponding elastomer ring and changes only insignificantly or not at all due to the support ring.

The inventive provision of at least one damping ring and the exclusive storage above it serve, in combination, to shift the resonance point to low frequencies while at the same time providing very soft torsional rigidity.

The support ring itself can be largely rigid and/or made of a metal or thermoplastic. An elastomer ring is arranged on both sides of the support ring in the radial direction. Each elastomer ring can have a contact surface on its radial side facing away from the support ring, which enables a contact without material bonding. The unit, the bearing structure or an outer or inner sleeve can rest on this. Alternatively, however, a connection surface is also conceivable, to which an outer or inner sleeve can be materially bonded, for example by vulcanization.

The unit can be, for example, a stator of an electric motor, a pump or a compressor. It may include a housing. The unit is able to generate torsional vibrations or excitations. Units with a rotating shaft are conceivable here, such as pumps (water pump or coolant pump), compressors (air compressors, coolant compressors, blowers) or an electric motor for the Drive or other functions (pump, compressor) of a motor vehicle. Torsional vibrations in units can arise from cyclic torque variation through areas with a narrow gap between permanent magnet and coil, such as in an electric motor, from sloshing and stirring movements of a medium in the circumferential direction or recoils of the medium, such as in a pump or a fan, or due to cyclic torsional shocks during compression with sudden expansion of the compression medium in the circumferential direction, such as in compressors. The central longitudinal axis can extend through the unit, preferably along the component that causes vibration.

According to a conceivable embodiment of the assembly according to the invention, the at least one damping ring can consist exclusively of the support ring and the two elastomer rings. This creates a three-part component that can be produced cost-effectively and in an optimized installation space. The damping ring can then be calibrated during assembly by the unit and/or the bearing structure.

According to a conceivable embodiment of the assembly according to the invention, the elastomer rings can be designed in one piece, that is to say consist of one piece. As a result, a vulcanization tool can be designed to be simple and cost-effective. It is conceivable, for example, that the support ring is covered by the elastomer of the elastomer rings on at least one of its axial sides. The axial covering serves to ensure a defined tight fit through friction despite tolerances, temperature-related expansions and/or superimposed movements.

According to a conceivable embodiment of the assembly according to the invention, the elastomer rings can be separate components, i.e. they can be free of any connection to one another. It is conceivable, for example, that the support ring separates the two elastomer rings in the radial direction and is not covered by the elastomer or is exposed on the front side of the damping ring. This means that the support ring can not only carry the elastomer rings, but can also serve as an unbuffered stop. This is advantageous because the end face of the support ring can be pressed or sealed in the vulcanization tool.

According to a conceivable embodiment of the assembly according to the invention, the support ring can be embedded in the elastomer of the elastomer rings, preferably completely. When producing the damping ring, the support ring is inserted into a vulcanization tool and encapsulated with elastomer, this elastomer then forming the elastomer rings. This embedding means that the support ring can move freely in order to achieve the desired rigidity effects (low torsional rigidity and high radial rigidity) to a particularly pronounced extent.

According to a further embodiment of the assembly according to the invention, it can comprise only one damping ring, which is arranged on the outer circumference of the center of gravity of the unit. Alternatively, the assembly can comprise only two damping rings, which are arranged on each axial end side of the unit, preferably equidistant from the center of gravity of the unit.

If only one damping ring is provided, the arrangement can preferably be selected so that the damping ring surrounds the center of mass on the circumference. This prevents imbalances and the unit from swinging in one direction or undesirable wobbling. If only two damping rings are provided, the arrangement on the end sides is advantageous in order to maximize the frequency of the mode shape with rotation orthogonal to the longitudinal axis. This results in stable storage.

According to a further embodiment of the assembly according to the invention, the elastomer rings can be vulcanized to the support ring by means of an adhesion promoter and/or the support ring can have bores into which at least one of the elastomer rings can engage in a form-fitting manner. Both variants serve to securely and permanently connect the support ring and the corresponding elastomer ring.

According to a further embodiment of the assembly according to the invention, the support ring can be, at least in sections, a cylindrical support ring or a truncated cone-shaped support ring. A cylindrical support ring is particularly cost-effective to produce and can be designed in such a way that, due to its symmetry with respect to its central longitudinal axis (rotational symmetry) and/or with respect to its longitudinal center plane and/or with its transverse center plane (mirror symmetry), it does not introduce its own imbalance into the damping ring. It is therefore conceivable that the damping ring is designed to be rotationally symmetrical with respect to its central longitudinal axis and/or mirror-symmetrical with respect to its longitudinal center plane and/or mirror-symmetrical with respect to its transverse center plane. A truncated cone-shaped support ring advantageously has not only a self-centering effect but also a higher axial rigidity. The elastomer rings are then also subjected to pressure when subjected to axial loading. It is advantageous that the damping ring can have the shape of a parallelogram in longitudinal section, but preferably at least the support ring and the both elastomer rings up to the contact surface or connection surface.

According to a conceivable embodiment of the assembly according to the invention, the elastomer rings can have a constant thickness in the longitudinal direction, preferably in the area (radially adjacent) of the contact surface or connection surface. The elastomer rings thus run parallel to the support ring in order to achieve a constant bearing behavior of the damping ring in the longitudinal direction.

According to a conceivable embodiment of the assembly according to the invention, the support ring can divide the elastomer of the two elastomer rings in half in the radial direction. Elastomer rings of equal thickness are therefore formed on both sides of the support ring, preferably in the area (radially adjacent) of the contact surface or connection surface. This results in the same stiffness behavior of the elastomer on both sides of the support ring.

According to a further embodiment of the assembly according to the invention, the damping ring can have a ring section and at least one annular collar section arranged thereon, which extends in the radial direction. By means of this longitudinally L-shaped design of the damping ring, contact surfaces are created in the longitudinal direction, which can counteract the tendency of the unit to wobble while at the same time taking into account the torsional reduction in rigidity. This results in increased cardanic rigidity. The ring collar section can include the support ring and the elastomer rings arranged on both sides. This ring section maintains the torsional rigidity, but in addition to the radial rigidity, the axial rigidity is also increased, since an elastomeric pressure track now also exists in the axial direction

According to a further embodiment of the assembly according to the invention, the damping ring can comprise an outer sleeve and/or an inner sleeve. The sleeve(s) makes it possible to calibrate the damping ring and thereby increase the stiffness spread. A corresponding one of the two elastomer rings can connect the support ring to the corresponding sleeve. This, for example, increases the effect of the elastomer-separating support ring. The corresponding sleeve can be a sleeve that is continuously closed in the circumferential direction, but can also be a sleeve with longitudinal slots. This allows the damping ring to be compressed in the circumferential direction when mounted on the unit and/or the storage structure, so that the slot in the sleeve closes. It is also conceivable that the support ring is slotted longitudinally. As a result, a calibration of one elastomer ring can also be passed on to the elastomer ring arranged on the other radial side of the support ring.

According to a further embodiment of the assembly according to the invention, the inner radial elastomer ring and/or the outer radial elastomer ring can have elastomer spokes extending in the radial direction. The elastomer spokes can be interrupted by free spaces in the circumferential direction. For this purpose, the support ring can also have support tabs projecting in the axial direction and/or can be designed to be segmented in the circumferential direction. The inner radial elastomer spoke can extend in the direction of the outer radial elastomer spoke and vice versa, thereby forming a support spoke. The support tabs or support ring segments can protrude into the elastomer spokes or support spokes. By means of the elastomer spokes or free spaces, the elastomer rings can be made even softer than would be possible with other constructive measures using solid material. Thicker elastomer is often not possible due to installation space limitations and a softer rubber compound is often not possible/desirable. This configuration results in an enhanced effect in combination with the invention.

According to a further embodiment of the assembly according to the invention, the inner radial elastomer ring and/or the outer radial elastomer ring can each form at least one elastomer flange which extends in the radial direction, with at least one of the axial end faces of the elastomer flange defining an axial elastomer buffer. The elastomer flange can protrude freely in the radial direction. It can therefore be free on both axial sides. The extension in the radial direction can be outwardly or inwardly radial. The elastomer flange can also serve as an assembly aid and/or axial positive fit to secure the damping ring. It is conceivable that only one of the two elastomer rings, preferably the outer radial elastomer ring, has two elastomer flanges at the axial ends. The support ring and the other elastomer ring can therefore be free of flanges or ring collars and can be produced inexpensively. In addition to a pure assembly aid to find the axial position and prevent tilted installation, the at least one elastomer flange can form a positive fit with a surrounding structure, thereby preventing axial and/or gimbal slipping due to micromovements.

According to a further embodiment of the assembly according to the invention, a ratio between an axial extent of the damping ring and a radial extent of the damping ring can be in the range of 1:1 and 5:1, preferably in the range from 3:1 to 5:1. The radial extension can exist between the contact surfaces or connecting surfaces, since this area primarily absorbs radial forces. As a result, large areas are formed on the circumference and a high radial pressure can be built up in the elastomer. It is known that relevant effects also occur adjacent to the above-mentioned border area, sometimes in a weaker form.

According to the invention, it is also proposed to use a damping ring according to the disclosure for mounting an aggregate on a storage structure, the damping ring comprising a support ring which carries an inner radial elastomer ring and an outer radial elastomer ring, the aggregate being supported or storable exclusively by means of the at least one damping ring.

The damping ring, the unit and/or the bearing structure can be designed according to the disclosure. The advantages already described above with regard to the assembly also apply to its use, to which reference is hereby made.

• 1 eine perspektivische Ansicht einer erfindungsgemäßen Baugruppe;
• 2 eine Ansicht eines erfindungsgemäßen Dämpfungsrings aus 1;
• 3 eine Querschnittansicht des Dämpfungsrings nach 2;
• 4 eine Längsschnittansicht des Dämpfungsrings nach 2;
• 5 eine Längsschnittansicht einer weiteren erfindungsgemäßen Baugruppe;
• 6 eine Längsschnittansicht eines Dämpfungsrings gemäß weiterer Ausführung;
• 7 eine perspektivische Ansicht eines Stützrings;
• 8 eine perspektivische Ansicht eines Dämpfungsrings gemäß weiterer Ausführung;
• 9 eine perspektivische Ansicht eines weiteren Stützrings;
• 10 eine Längsschnittansicht eines Dämpfungsrings gemäß weiterer Ausführung;
• 11 eine perspektivische Ansicht eines weiteren Stützrings;
• 12eine Längsschnittansicht eines Dämpfungsrings gemäß weiterer Ausführung;
• 13eine Längsschnittansicht eines Dämpfungsrings gemäß weiterer Ausführung und
• 14eine Querschnittansicht eines weiteren Dämpfungsrings.

Further features, details and advantages of the invention emerge from the wording of the claims and from the following description of exemplary embodiments based on the drawings. Show it:

• 1 a perspective view of an assembly according to the invention;
• 2 a view of a damping ring according to the invention 1 ;
• 3 a cross-sectional view of the damping ring 2 ;
• 4 a longitudinal section view of the damping ring 2 ;
• 5 a longitudinal sectional view of a further assembly according to the invention;
• 6 a longitudinal sectional view of a damping ring according to a further embodiment;
• 7 a perspective view of a support ring;
• 8th a perspective view of a damping ring according to a further embodiment;
• 9 a perspective view of another support ring;
• 10 a longitudinal sectional view of a damping ring according to a further embodiment;
• 11 a perspective view of another support ring;
• 12a Longitudinal section view of a damping ring according to a further embodiment;
• 13a Longitudinal section view of a damping ring according to a further version and
• 14a Cross-sectional view of another damping ring.

In the figures, identical or corresponding elements are each designated with the same reference numerals and will therefore not be described again unless appropriate. Features already described will not be described again to avoid repetition and are applicable to all elements with the same or corresponding reference numerals, unless explicitly excluded. The disclosures contained in the entire description can be applied analogously to the same parts with the same reference numbers or the same component names. The location information chosen in the description, such as: B. above, below, side, etc. related to the figure directly described and shown and should be transferred accordingly to the new position when the position changes. Furthermore, individual features or combinations of features from the different exemplary embodiments shown and described can also represent independent, inventive or inventive solutions.

Starting from a central longitudinal axis Z, a radial direction R extends. A circumferential direction U extends around the central longitudinal axis Z. The central longitudinal axis Z extends in the axial direction A. The terms axial or longitudinal can be used synonymously.

1 shows an assembly 2, which includes an aggregate 4 and a single damping ring 6. The unit 4 is therefore mounted exclusively via the one damping ring 6 on a bearing structure 22 and is vibration-decoupled from it. The damping ring 6 is thus used to store the unit 4 on the storage structure 22. The damping ring 6 surrounds the center of mass M of the unit 4 on the circumference. The storage structure 22 here includes, for example, a tensioning element 28, such as a clamp, which rests on the outer circumference of the damping ring 6 and tensions it. The unit 4 is shown here as an example as a pump.

The 2 to 4 show the damping ring 6 of 1 in a unique position, whereby this damping ring 6 has a support ring 8, as well as an inner radial elastomer ring 10 and an outer radial elastomer ring 12. It is thus formed from only these parts. Each of the two elastomer rings 10, 12 has a contact surface 30 on its radial side facing away from the support ring 8. The unit 4 rests on the contact surface 30 of the inner radial elastomer ring 10 and the bearing structure 22 or its clamping element 28 rests on the contact surface 30 of the outer radial elastomer ring 12.

The support ring 8 is cylindrical and embedded in the elastomer of the elastomer rings 10, 12. The elastomer rings 10, 12 are designed as separate components. The support ring 8 separates the two elastomer rings 10, 12 in the radial direction R, like 4 in particular shows. The support ring 8 is therefore not covered by the elastomer of the elastomer rings 10, 12 on the front side of the damping ring 6; rather, it lies free there. The elastomer rings 10, 12 extend in the longitudinal or axial direction A over the entire length of the support ring 8. The support ring 8 divides the elastomer of the two elastomer rings 10, 12 in half in the radial direction R, at least in the area or radially adjacent to the contact surfaces 30. Zu Elastomer rings 10, 12 of the same thickness are therefore formed on both radial sides of the support ring 8. It can be seen that a ratio between an axial extent EA of the damping ring 6 and a radial extent ER of the damping ring 6 is an exemplary value of 4:1, with the radial extent ER between the contact surfaces 30.

While the inner radial elastomer ring 10 is completely cylindrical, the outer radial elastomer ring 12 forms two elastomer flanges 12b, which extend in the radial direction R or outwardly. The elastomer flanges 12b are provided in the axial end regions of the elastomer ring 12. Each of the elastomer flanges 12b defines an axial elastomer buffer on its axial end face 26.

5 shows another assembly 2, which includes a unit 4 and two damping rings 6. The damping rings 6 are each arranged on an axial end side E of the unit 4 and equidistant from the center of mass M of the unit 4. The unit 4 is shown here as an example of an electric motor, which is decoupled from vibrations via the damping rings 6 compared to the bearing structure 22, which is shown as an example as a housing.

6 shows a longitudinal sectional view of a damping ring 6 according to a further embodiment. It can be seen that although the inner radial elastomer ring 10 still has a contact surface 30 for contact with the unit 4, the outer radial elastomer ring 12 is now surrounded by an outer sleeve 16 and has a connection surface 32 there. In addition, the damping ring 6 now has a ring section 6a and an annular collar section 6b arranged thereon, which extends in the radial direction R or radially inwards. The support ring 6, the two elastomer rings 10, 12 and the outer sleeve 16 follow this L-shaped course. The ring section 6a is essentially cylindrical.

7 shows a support ring 8 alone, which is designed as a longitudinally slotted support ring and has bores 14 extending in the radial direction R. The elastomer rings 10, 12 can engage in a form-fitting manner in the bores 14. When producing the damping ring 6, the support ring 8 is inserted into a vulcanization tool and encapsulated with elastomer. The elastomer flows into the bores 14 and thus forms a positive fit with the support ring 8 after vulcanization.

8th shows another damping ring 6 in a perspective view. The damping ring 6 is essentially cylindrical. The support ring 8 is axially exposed on both sides and both elastomer rings 10, 12 now have connection surfaces 32. An inner sleeve 18 is materially connected to the inner radial elastomer ring 10 and an outer sleeve 16 is materially connected to the outer radial elastomer ring 12. The inner sleeve 18 is a sleeve that is continuously closed in the circumferential direction U, while the outer sleeve 16 is a longitudinally slotted sleeve. The support ring 8 is also slotted longitudinally. The slots are congruent in the radial direction R.

When the damping ring 6 is mounted, it is consequently compressed in the circumferential direction U, so that the recess 34 formed by the slots closes. The forces that arise can create a frictional connection between the outer sleeve 16 and the storage structure 22. In addition, the material of the elastomer rings 10, 12 is prestressed or calibrated.

The 9 and 10 show another support ring 8 in isolation and in the context of another damping ring 8. In 10 a part of the damping ring 6 is hidden. The support ring 8 has support tabs 20 projecting in the axial direction A. In the circumferential direction U, free spaces 36 are thus provided between adjacent support tabs 20. The elastomer rings 10, 12 are now not continuous in the circumferential direction U, but have elastomer spokes 10a, 12a extending in the radial direction R, with the inner radial elastomer spokes 10a extending in the direction of the outer radial elastomer spokes 12a and vice versa, whereby a support spoke 38 is formed in each case. In the circumferential direction U, the elastomer spokes 10a, 12a are interrupted by free spaces 37. The elastomer rings 10, 12 are thus separated in the circumferential direction U. mented. The support tabs 20 protrude into the support spokes 38. The elastomer spokes 10a, 12a each have connection surfaces 32 to the outer sleeve 16 or inner sleeve 18.

The 11 and 12 resemble the 9 and 10 , whereby the support ring 6 is now designed to be segmented in the circumferential direction U and consists of support ring segments 24. These support ring segments 24 now protrude into the support spokes 38.

13 shows a further assembly 2 in a schematic view, which comprises an aggregate 4 and at least one damping ring 6. The damping ring 6 now comprises a truncated cone-shaped support ring 8. In longitudinal section, both the support ring 8 and the two elastomer rings 10, 12 have the shape of parallelograms, so that the damping ring 6 itself also has the shape of a parallelogram.

14 resembles the 9 and 10 , wherein the damping ring 6 can have elastomer flanges 12b. In contrast to the damping ring 6 9 and 10 The two elastomer rings 10, 12 are now exposed - so they are not provided with an outer sleeve 16 and an inner sleeve 18. Both elastomer rings 10, 12 are designed to be segmented in the circumferential direction U, with the individual segments or elastomer spokes 10a, 12a being arranged congruently in the radial direction R. Here, the segments or elastomer spokes 10a of the inner radial elastomer ring 10 form a common contact surface 30 and the segments or elastomer spokes 12a of the outer radial elastomer ring 12 form a common contact surface 30.

The invention is not limited to one of the previously described embodiments, but can be modified in many ways. All features and advantages arising from the claims, the description and the drawing, including constructive details, spatial arrangements and process steps, can be essential to the invention both individually and in a wide variety of combinations.

All combinations of at least two of the features disclosed in the description, the claims and/or the figures fall within the scope of the invention.

To avoid repetition, features disclosed according to the device should also be considered as disclosed according to the method and should be claimable. Likewise, features disclosed according to the method should be considered as disclosed according to the device and can be claimed.

Reference symbol list

2

module

4

Aggregate

6

Damping ring

6a

Ring section

6b

gorget section

8th

Support ring

10

Elastomer ring

10a

Elastomer spoke

12

Elastomer ring

12a

Elastomer spoke

12b

Elastomer flange

14

drilling

16

Outer sleeve

18

Inner sleeve

20

Support tab

22

Storage structure

24

Support ring segment

26

front side

28

Clamping element

30

investment area

32

connection surface

34

recess

36

free space

37

free space

38

Support spoke

A

Axial direction

E

End page

E.A

Axial extension

HE

Radial extension

M

Center of mass

R

Radial direction

U

Circumferential direction

Z

Central longitudinal axis

Claims (10)

Assembly (2), comprising a unit (4) and at least one damping ring (6), the damping ring (6) comprising a support ring (8) which carries an inner radial elastomer ring (10) and an outer radial elastomer ring (12), wherein the Unit (4) is stored or can be stored exclusively by means of the at least one damping ring (6). Assembly (2). Claim 1 , characterized in that it exclusively comprises a damping ring (6), which is arranged on the outer circumference to the center of mass (M) of the unit (4), or exclusively comprises two damping rings (6), each of which is on an axial end side (E) of the unit (4). 4), preferably arranged equidistant from the center of mass (M) of the unit (4). Assembly (2) according to one of the preceding claims, characterized in that the elastomer rings (10, 12) are vulcanized to the support ring (8) by means of an adhesion promoter and/or the support ring (8) has bores (14) into which at least one the elastomer rings (10, 12) engage in a form-fitting manner. Assembly (2) according to one of the preceding claims, characterized in that the support ring (8) is at least partially a cylindrical support ring or a truncated cone-shaped support ring. Assembly (2) according to one of the preceding claims, characterized in that the damping ring (6) has a ring section (6a) and at least one annular collar section (6b) arranged thereon, which extends in the radial direction (R). Assembly (2) according to one of the preceding claims, characterized in that the damping ring (6) comprises an outer sleeve (16) and/or an inner sleeve (18). Assembly (2) according to one of the preceding claims, characterized in that the inner radial elastomer ring (10) and/or the outer radial elastomer ring (12) has/have elastomer spokes (10a, 12a) extending in the radial direction (R). Assembly (2) according to one of the preceding claims, characterized in that the inner radial elastomer ring (10) and / or the outer radial elastomer ring (12) forms / form at least one elastomer flange (12b) which extends in the radial direction (R), wherein at least one of the axial end faces (26) of the elastomer flange (12b) defines an axial elastomer buffer. Assembly (2) according to one of the preceding claims, characterized in that a ratio between an axial extent (EA) of the damping ring (6) and a radial extent (ER) of the damping ring (6) is in the range of 1:1 and 5:1. Use of one of the damping ring (6) for supporting a unit (4) on a storage structure (22), the damping ring (6) comprising a support ring (8) which carries an inner radial elastomer ring (10) and an outer radial elastomer ring (12), wherein the unit (4) is supported or can be stored exclusively by means of the at least one damping ring (6).

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