Damping adjustment device for a vibration damper, and vibration damper

Abstract

The present invention relates to a damping adjustment device (2) for a vibration damper (1), having an outer housing (10) with a receiving region (15), a pole body (20) which forms an armature space (40), an exciter coil (50) and an armature (55), wherein the pole body (20) has been inserted into the receiving region (15), forming a coil space (45) in which the exciter coil (50) is arranged, wherein the armature (55) is movable along a longitudinal axis (L) in the armature space (40) when the exciter coil (50) is energised, wherein the position of the pole body (20) in the outer housing (10) is defined by a pin (70) which is oriented parallel to the longitudinal axis (L), wherein a vent duct (80) for venting the armature space (40) is provided, and wherein the vent duct (80) extends through the pin (70). The invention also relates to a vibration damper.

Description

[0001] Damping adjustment device for a vibration damper and vibration damper

[0002] The present invention relates to a damping adjustment device according to the preamble of patent claim 1 and to a vibration damper with such a damping adjustment device with the features of patent claim 20.

[0003] Damping adjustment devices are already known in various designs from the prior art and are used to adjust the damping behavior of a vibration damper. Such adjustable vibration dampers are particularly widely used in vehicles and are intended to increase ride comfort and contribute to driving safety. For this purpose, a control unit of a chassis control system can use data from, among other things, acceleration and displacement sensors to individually adjust the damping behavior of each individual wheel on an axle. In this way, vibrations generated by the vehicle's movement along the road are dampened, and driving comfort and safety are increased.

[0004] Vibration dampers in the prior art typically comprise a vibration damper tube in which a damping adjustment device is fastened to a piston rod and can move back and forth in damping oil. The integrated damping adjustment device serves to actuate a pilot stage of a main stage and can form a type of piston in the damping tube. Depending on the control of the damping adjustment device, more or less fluid can flow through the piston. Known damping adjustment devices comprise an electromagnetic actuating device arranged in an outer housing with an excitation coil and an armature, wherein the excitation coil can be moved in an armature space of a pole body in order to open or close a valve in a main stage depending on the electrical current. The movement of the armature can be used to regulate a pressure which is applied to the main stage.In this way, oil pressure in the damping tube can be regulated and a softer or harder damping can be set by the vibration damper.

[0005] The actuating device is usually supplied with power via electrical cables that are routed through the piston rod and through parts of the damping adjustment device to the excitation coil.

[0006] Since the damping adjustment device is arranged inside the damping tube filled with damping oil, the damping adjustment device must be sealed against the damping oil in such a way that the latter does not penetrate into a coil space in which the excitation coil is arranged and impair the functionality of the damping adjustment device.

[0007] In addition, air bubbles may be trapped in the damping oil or air bubbles (e.g.) may form which, particularly if they penetrate into an armature chamber, may accumulate there and lead to malfunctions in the damping adjustment device. In particular, damping adjustment devices used as intended are arranged vertically in a vibration damper, which is why the air bubbles accumulate in the armature chamber and, due to the different viscosity and different pressure-temperature-volume properties of the damping oil and the air bubbles, the characteristic curve of the electromagnetic actuating device is changed.

[0008] This is where the present invention comes in

[0009] Based on this prior art, the object of the present invention is to propose a suitably improved damping adjustment device. The proposed damping adjustment device should preferably enable simple and cost-effective production on the one hand, and ensure reliable operation and consistent damping characteristics of the vibration damper on the other.

[0010] These objects are achieved by a damping adjustment device having the features of patent claim 1 and a vibration damper having the features of patent claim 20.

[0011] Further advantageous embodiments of the present invention are the subject of the dependent claims.

[0012] The damping adjustment device according to the invention for a vibration damper comprises an outer housing with a receiving area and a cup-shaped pole body forming an armature space. The outer housing has an outer side and an inner side, with the inner side surrounding the receiving area.

[0013] Furthermore, the damping adjustment device comprises an electromagnetic actuating device with an excitation coil and an armature. The armature is movable along a longitudinal axis in the armature chamber, and the armature can be moved along the longitudinal axis when the excitation coil is energized.

[0014] The cup-shaped pole body is further inserted into the receiving area of ​​the outer housing, preferably through an open end of the outer housing, to form a coil space—preferably hollow and cylindrical. The excitation coil is arranged in the coil space between the pole body and the outer housing. Typically, the excitation coil can be fixedly arranged on an outer surface of the pole body and, during assembly of the damping adjustment device, can be inserted into the receiving area of ​​the outer housing with the pole body.

[0015] Furthermore, it can be advantageous if the position of the pole body in the outer housing is predetermined by a pin oriented parallel to the longitudinal axis. The pin can preferably be arranged on the inside of the outer housing and protrude into the receiving area. When inserting the cup-shaped pole body with the excitation coil, the pin determines the position of the pole body relative to the outer housing. This can ensure that a defined guide is achieved for the electrical lines for energizing the excitation coil.

[0016] Furthermore, it has proven advantageous if a venting channel is provided for venting the armature chamber. The venting channel preferably connects the armature chamber to an outer side of the outer housing and opens on the outside into an outer space surrounding the outer housing. The venting channel is formed by a closed line formed in the pole body and the outer housing. Furthermore, it has proven advantageous if the venting channel is led through the pin. For this purpose, the pin can be hollow in its longitudinal axis and form a section of the venting channel in the manner of a tube.

[0017] The proposed damping adjustment device is based on the idea of ​​combining the positional fixation of the pole body with the venting of the armature chamber, thus allowing a particularly simple and compact design. In particular, the recesses or holes required for the positional fixation of the pole body and the venting channel can be created in a single work step, which significantly simplifies the manufacturing process.

[0018] A further development of the present invention provides that the pin engages in a first recess in the outer housing and in a second recess in the pole body. Both the first recess and the second recess can be created by drilling and correspond in diameter to the pin. In a preferred embodiment, the first recess is formed on an end face of the inside of the outer housing, and more preferably, the second recess is formed on an end face on an outside of the pole body.

[0019] According to a further development of the present invention, a first seal and a second seal are provided. The first seal seals within the first recess between the pin and the outer housing, and the second seal seals within the second recess between the pin and the pole body. The arrangement of the first seal and the second seal tightly seals the coil chamber from the vent channel. This prevents damping oil, gases, or air from penetrating the coil chamber from the vent channel.

[0020] A further development of the present invention provides that the first seal and the second seal each comprise a sealing ring. Such sealing rings are available as standardized or normed components. For example, the sealing ring can be an O-ring.

[0021] Furthermore, it has proven advantageous if the first seal and the second seal are each inserted into a circumferential groove or radial groove formed in the pin. The grooves can be introduced into the pin in a simple and cost-effective manner.

[0022] A further development of the present invention provides that the venting channel in the pin has a first section and a second section, the second section forming a throttle. In particular, it is preferred if the ratio of the line cross-sections through which the flow can pass to the formation of the throttle is 1:5. Diameters of the throttle in a range between approximately 0.2 and 0.4 mm have proven particularly suitable. The throttle can easily create a flow resistance in the venting channel, by means of which flow resistance the volume flow through the venting channel can be adjusted. The proposed venting can be designed without a valve, in particular without a check valve.

[0023] Furthermore, it has proven advantageous if the pole body comprises a base section that closes off the armature space at the end along the longitudinal axis, i.e., on the side opposite the open end along the longitudinal axis. The cup-shaped pole body has a pole tube section and a base section. The pole body therefore has an open side and a closed side, the closed side being formed by the base section.

[0024] Furthermore, it may be advantageous if a first bearing section and a second bearing section are formed. The armature can be movable between the two bearing sections in the armature space and can preferably be mounted on the bearing sections by means of a tappet so that it can move relative to the pole body along its longitudinal axis.

[0025] According to a further development, the plunger can preferably be hollow cylindrical and can have an opening along the longitudinal axis.

[0026] It is also advantageous if a collecting chamber is formed between the base section and the first bearing section. The collecting chamber can be formed at the end of the armature chamber in the armature chamber. The collecting chamber can also be arranged on a side of the first bearing section facing away from the armature chamber and can be in fluid communication with the armature chamber. When the device is used as intended, the collecting chamber is arranged above the armature chamber. Air bubbles can rise into the collecting chamber and collect without coming into direct contact with the armature or with a running gap in the armature. A free end of the tappet preferably projects into the collecting chamber, as a result of which the latter can be ventilated and / or vented through the opening in the tappet. A further development of the present invention provides that the venting channel opens into the collecting chamber.Preferably, the venting channel opens into the collecting space on the side opposite the first storage section, whereby the outflow of accumulated media from the collecting space through the venting channel can be promoted.

[0027] Furthermore, it has proven advantageous if the venting channel comprises a second connecting line which connects the second recess and the collecting space, and if the second connecting line runs at an angle to the longitudinal axis. Due to the inclined arrangement of the second connecting line, the first recess and the collecting section can be formed with different diameters in the pole body. This enables, for example, a compact design taking into account a cable feed, which is preferably arranged on the side of the base section or the return plate facing away from the armature space. Typically, the cable feed comprises a groove running radially from the center, through which the electrical lines can be guided from the piston rod to the excitation coil.

[0028] It has also proven advantageous if the venting channel comprises a first connecting line which is arranged or formed in the outer housing. The first connecting line opens out on an outer side of the outer housing and establishes the connection between the outer side and the inner side of the outer housing on the side of the outer housing facing away from the open end. In particular, it is further advantageous if the second connecting line opens out in the longitudinal axis with respect to the armature space on a side opposite an open end of the cup-shaped outer housing.

[0029] A further development of the present invention provides that a flange portion is formed at an open end of the pole body, and that a coil chamber seal is arranged on the flange portion. In particular, it is preferred if the pole body is pressed into the outer housing, whereby the frictional connection is established between the flange portion and the outer housing.

[0030] A further development of the present invention provides for a pole core to be inserted into the open end of the pole body. The pole core preferably forms the previously mentioned second bearing section. The pole core can be pressed into the pole body.

[0031] Furthermore, it has proven advantageous if the cup-shaped pole body comprises a magnetic bottleneck. In particular, it is preferred if the magnetic bottleneck is formed in the pole tube section and, more preferably, on the side facing away from the armature space.

[0032] Furthermore, it has proven advantageous for the pole body to be made of one piece. In other words, the flange section and / or the pole tube section and / or the base section are preferably made of one piece. This eliminates any leak-prone connections in the pole body that would require additional seals to tightly close the coil space.

[0033] A further aspect of the present invention or a preferred development of the present invention provides that the armature has at least one projection on an outer surface or the pole body has at least one projection on the inner surface. The at least one projection projects into a - preferably hollow cylindrical - running gap which is formed between an outer surface of the armature and an inner surface of the pole body or of the pole tube section. The projection can reduce vibrations of the armature without significantly influencing the switching behavior of the armature.

[0034] The width of the running gap influences the dynamics of the armature's movement, which depends in particular on the viscosity of the damping oil surrounding the armature. Wide running gaps reduce this dependence; however, it has been shown that wide running gaps promote armature vibrations. The at least one projection inhibits armature vibrations in a plane transverse to the longitudinal axis by locally reducing the running gap, and the at least one projection minimizes the influence of the damping oil's viscosity.

[0035] A further development of the present invention provides that the at least one projection is arranged approximately centrally on the outer surface of the armature in the longitudinal axis.

[0036] It is also preferred if the length of the projection along the longitudinal axis is less than 1 / 2, preferably less than 1 / 5, more preferably less than 1 / 10 of the total length of the anchor. This arrangement of the at least one projection has proven effective.

[0037] Furthermore, it has proven advantageous if at least one projection completely surrounds the armature. This complete encirclement locally narrows the running gap over the entire circumference of the armature, thereby inhibiting vibrations in all directions in the plane transverse to the longitudinal axis.

[0038] A further development of the present invention provides that at least two projections are arranged spaced apart from one another along the longitudinal axis.

[0039] A further aspect of the present invention relates to a vibration damper with a damping adjustment device according to one of the preceding claims.

[0040] Three exemplary embodiments of a pressure control valve according to the invention are described in detail below with reference to the accompanying drawings. They show:

[0041] Figure 1 is a sectional view of a damping adjustment device according to a first embodiment,

[0042] Figure 2 is a sectional view of a damping adjustment device according to a second embodiment,

[0043] Figure 3 is a detailed view of an armature of the damping adjustment device according to Figures 1 and 2,

[0044] Figure 4 shows a detailed view of an armature of the damping adjustment device according to a first development of the armature, and

[0045] Figure 5 shows a detailed view of an armature of the damping adjustment device according to a second development of the armature. Identical or functionally identical parts or features are identified by the same reference numerals in the following detailed description of the figures. Likewise, not all identical or functionally identical parts or features are provided with a reference number in the figures.

[0046] Figure 1 shows a first exemplary embodiment of a damping adjustment device 2 for a vibration damper 1 which is only partially shown.

[0047] The damping adjustment device 1 can be used, for example, in the vibration damper 1, in particular of a motor vehicle, in order to adjust a damping characteristic of the vibration damper.

[0048] The damping adjustment device 1 comprises an outer housing 10, a pole body 20 and an electromagnetic actuating device referred to as a whole, comprising an excitation coil 50 and an armature 55, wherein when the excitation coil 50 is energized, the armature 55 can be moved along a longitudinal axis L of the damping adjustment device 1.

[0049] The outer housing 10 is cup-shaped and has an outer side 18 and an inner side 17. Furthermore, the outer housing 10 has an open end 11 and a receiving area 15. The inner side 17 surrounds the receiving area 15.

[0050] On the side of the open end 11 opposite in the longitudinal axis L, a piston rod 8 can be arranged, by means of which the damping adjustment device 1 can be held in an outer space 5 of the vibration damper 1 enclosed by a damping tube (not shown).

[0051] The pole body 20 is cup-shaped and can comprise a base portion 26, a pole tube portion 27, and a flange portion 28. The cup-shaped pole body 20 extends along the longitudinal axis L and has an open end 21 at one end and the base portion 26 at the other end. The pole tube portion 27 is arranged between the base portion 26 and the flange portion 28, with the flange portion 28 being arranged around the open end 21 at the end.

[0052] The pole body 20 furthermore has a magnetic bottleneck 35, wherein the magnetic bottleneck 35 can be formed on an outer surface of the pole tube section 27 as a notch which forms a control cone.

[0053] The pole body 20 is preferably made of one piece. Thus, in particular, the flange section 28 and / or the pole tube section 27 and / or the base section 26 are made of one piece, and there are no leak-prone connections in the pole body 20.

[0054] An armature chamber 40 is formed or arranged in the pole body 20. The armature 55 is movably arranged in the armature chamber 40 between a first bearing section 31 and a second bearing section 32. The pole body 20 has an inner circumferential surface 36 that radially surrounds the armature chamber 40, and the armature 55 has an outer circumferential surface 56. A running gap is formed between the inner circumferential surface 36 and the outer circumferential surface 56.

[0055] The first bearing section 31 is arranged adjacent to the base section 26 and the second bearing section 32 is arranged in the longitudinal axis L on the opposite side of the armature space 40, namely on the side of the armature space 40 facing the open end 21.

[0056] As can be seen from Figures 1 and 2, the first bearing section 31 can be formed as an integral part of the pole body 20, and the second bearing section 32 can be formed by a pole core 30 inserted into the pole body 20. The pole core 30 is preferably pressed into the pole body 20.

[0057] The armature 55 is held mounted on the first bearing section 31 and the second bearing section 32 by means of a plunger 54, wherein the respective bearing section 31, 32 can have a bearing element 33.

[0058] The dimensioning of the running gap has a significant influence on the dynamics of the damping adjustment device 1. The smaller the running gap, the more the viscosity of the damping oil influences the dynamic behavior. Larger running gaps result in increased armature vibrations.

[0059] In order to avoid armature vibrations, the armature 55 has - as shown in Figure 3 - a projection 57 designed as a step, which reduces the running gap in some areas along the longitudinal axis L.

[0060] The projection 57 is arranged approximately centrally on the outer surface 56 in the longitudinal axis L and completely surrounds the armature 55.

[0061] Further developments of the armature 55 are shown in Figures 4 and 5, wherein Figure 4 shows a plurality of tooth- or prong-shaped projections 57 which are arranged at a distance from one another along the longitudinal axis L. A single projection 57, see Figure 5, can also be arranged on the outer circumferential surface 56. The length of the tooth- or prong-shaped projection 57 is preferably less than 1 / 5, even more preferably less than 1 / 10, of the length of the armature 55.

[0062] The cup-shaped pole body 20 is inserted into the receiving area 15 of the likewise cup-shaped outer housing 10, wherein an annular cavity is enclosed between the outer housing 10 and the pole body 20, which is referred to as coil space 45.

[0063] Furthermore, it can be seen from Figures 1 and 2 that the position of the polar body 20 is predetermined and fixed by a pin 70.

[0064] The pin 70 is inserted into a first recess 12 in the outer housing 10 and into a second recess 22 of the pole body 20.

[0065] The excitation coil 50 is arranged in the coil chamber 45, wherein the excitation coil 50 is arranged fixedly on the pole body 20. The coil chamber 45 is tightly closed, wherein a coil chamber seal 34 is arranged for sealing between the outer housing 10 and the pole body 20, more precisely between the flange portion 28 and the outer housing 10.

[0066] The coil chamber seal 34 can be designed as a sealing ring that seals the coil chamber 45 enclosed by the pole body 20 and the outer housing 10 in a media-tight manner. The excitation coil 50 can be energized by means of electrical lines 52, wherein the electrical lines 52 are preferably passed centrally through the piston rod 8 and the outer housing 10.

[0067] - as indicated in Figures 1 and 2 - are guided.

[0068] Furthermore, on an end face of the pole body 20 or the base section 26 facing away from the armature chamber 40, a radially extending groove 38 is formed through which the electrical lines 52 are guided from a central feed into the coil chamber 45.

[0069] In order for the electrical lines 52 to provide a proper connection to the excitation coil 50, the position of the excitation coil 50 relative to the outer housing 10 or the pole body 20 relative to the outer housing 10 must be defined, which

[0070] - as already explained - is achieved by the pin 70.

[0071] Furthermore, a vent is provided for the armature chamber 40. The vent comprises a vent channel 80 formed by a line formed in the pole body 20 and the outer housing 10. The vent channel 80 is guided through the pin 70. Thus, the positional fixation of the pole body 20 is combined with the venting of the armature chamber 40, resulting in a significantly simplified manufacturing process.

[0072] The vent channel 80 connects the armature chamber 40 to an outer side 18 of the outer housing 10 and opens on the outer side 18 into an outer space 5 surrounding the outer housing 10. The pin 70 is preferably a hollow cylindrical pin and has a through opening which forms a portion of the vent channel 80.

[0073] The vent channel 80 in the pin 70 has at least two sections 71, 72 with different line cross-sections, the second section 72 forming a throttle 75 by which a volume flow flowing through the vent channel 70 can be adjusted. The line cross-sections preferably have a ratio of 1:5 or more.

[0074] To seal the coil chamber 45 from the vent channel 70, a first seal 13 and a second seal 23 are provided. The first seal 13 seals in the first recess 12 between the pin 70 and the outer housing 10, and the second seal 23 seals between the pin 70 and the pole body 20.

[0075] The first seal 13 and the second seal 14 are each inserted into an annular radial groove on opposite sides of the pin 70, wherein the seal can be a standardized or normed component, in particular an O-ring.

[0076] The first recess 12 is connected to the outer space 5 by means of a first connecting line 81. The first connecting line 81 is introduced into the outer housing 10 and can be oriented radially. The first connecting line 81 opens at one end onto the outer side 18 of the outer housing 10 and at the other end into the first recess 12. The second recess 22 is connected to the armature space 40 by means of a second connecting line 88. The second connecting line 82 is introduced into the pole body 20 and can be oriented axially or at an angle to the longitudinal axis L. The second connecting line 82 is connected to the armature space 40 and opens at the other end into the second recess 22.

[0077] The first connecting line 81 and / or the second connecting line 82 can be produced in a particularly simple manner by drilling, wherein the second connecting line 82 is drilled through the second recess 22.

[0078] Figure 1 shows that according to the first embodiment, a collecting space 48 is formed between the first bearing section 31 and the base section 26.

[0079] The collecting chamber 48 is fluidically arranged between the armature chamber 40 and the vent channel 80. In a typical use of the damping adjustment device 2, the collecting chamber 48 is located higher than the armature chamber 40. Thus, air bubbles do not accumulate in the armature chamber 45, in particular directly around the armature 55 in the armature chamber 40, but rather rise into the collecting chamber 48 due to buoyancy. There, the air bubbles do not come into direct contact with the armature 55.

[0080] The second embodiment according to Figure 2 differs from the first embodiment according to Figure 1 in that the second connecting line 82 opens directly into the armature chamber 40. More precisely, the venting channel 80 opens into a recess 44 in the armature chamber 40, which, when the damping adjustment device 2 is used as intended, represents the highest region of the armature chamber 40. Air bubbles collect in this recess 44.

[0081] Reference symbol list

[0082] 1 vibration damper

[0083] 2 Damping adjustment device

[0084] 5 Outdoor space

[0085] 8 Piston rod

[0086] 10 outer casings

[0087] 11 of fenes end of 10

[0088] 12 first recess

[0089] 13 first seal

[0090] 15 Recording area

[0091] 17 Inside

[0092] 18 Outside

[0093] 20 polar bodies

[0094] 21 of fenes end of 20

[0095] 22 second recess

[0096] 23 second seal

[0097] 26 floor section

[0098] 27 pole tube section

[0099] 28 Flange section

[0100] 30 pole cores

[0101] 31 first camp section

[0102] 32 second camp section

[0103] 33 Bearing element

[0104] 34 Coil chamber seal

[0105] 35 magnetic bottleneck

[0106] 38 grooves

[0107] 40 anchor room

[0108] 45 coil space

[0109] 48 collection room

[0110] 50 Excitation coil 52 Electrical cable

[0111] 54 tappets

[0112] 55 anchors

[0113] 56 shell surface

[0114] 57 lead

[0115] 70 pens

[0116] 71 first section

[0117] 72 second section

[0118] 73 Ring groove

[0119] 75 Throttle

[0120] 80 ventilation duct

[0121] 81 first connecting line

[0122] 82 second connecting line

[0123] L Longitudinal axis

Claims

Patent claims 1. Damping adjustment device (2) for a vibration damper (1), comprising - an outer housing (10) with a receiving area (15), - a pole body (20) forming an armature space (40), - an excitation coil (50) and - an anchor (55), - wherein the pole body (20) is inserted into the receiving area (15) to form a coil space (45) in which the excitation coil (50) is arranged, - wherein the armature (55) is movable in the armature space (40) in a longitudinal axis (L) when the excitation coil (50) is energized, characterized in that - the position of the pole body (20) in the outer housing (10) is predetermined by a pin (70) which is oriented parallel to the longitudinal axis (L), - wherein a venting channel (80) is provided for venting the armature chamber (40), and - wherein the venting channel (80) is guided through the pin (70).

2. Damping adjustment device (2) according to claim 1, characterized in that the pin (70) engages in a first recess (12) in the outer housing (10) and in a second recess (22) in the pole body (20).

3. Damping adjustment device (2) according to claim 1 or 2, characterized in that a first seal (13) and a second seal (23) are provided and that the first seal (13) seals in the first recess (12) between the outer housing (10) and the pin (70) and the second seal (23) between the pole body (20) and the pin (70).

4. Damping adjustment device (2) according to one of the preceding claims, characterized in that the first seal (13) and a second seal (23) each comprise an O-ring.

5. Damping adjustment device (2) according to one of the preceding claims, characterized in that the first seal (13) and a second seal (23) are each inserted into an annular groove (73) arranged in the pin (70).

6. Damping adjustment device (2) according to one of the preceding claims, characterized in that the venting channel (80) in the pin (70) has a first section (71) and a second section (72), the second section forming a throttle (75).

7. Damping adjustment device (2) according to one of the preceding claims, characterized in that the pole body (20) comprises a bottom section (26) which closes off the armature space (40) in the longitudinal axis (L), 8. Damping adjustment device (2) according to one of the preceding claims, characterized in that a collecting space (48) is formed between a base section (26) and a first bearing section (31).

9. Damping adjustment device (2) according to one of the preceding claims, characterized in that the venting channel (80) opens into the collecting space (48).

10. Damping adjustment device (2) according to one of the preceding claims, characterized in that the venting channel (80) comprises a first connecting line (82) in the outer housing (10), which opens in the longitudinal axis (L) with respect to the armature space (40) on a side opposite an open end (16) of the cup-shaped outer housing (10) on an outer side (18) of the outer housing (10).

11. Damping adjustment device (2) according to one of the preceding claims, characterized in that the venting channel (80) comprises a second connecting line (81) which connects the recess (21) and the collecting space (48) of the armature space (40) and that the second connecting line (82) runs inclined to the longitudinal axis (L).

12. Damping adjustment device (2) according to one of the preceding claims, characterized in that a flange section (32) is formed at an open end (21) of the pole body (20), and in that a coil chamber seal (34) is arranged on the flange section (32).

13. Damping adjustment device (2) according to one of the preceding claims, characterized in that a pole core (30) is inserted into an open end (21) of the pole body (20).

14. Damping adjustment device (2) according to one of the preceding claims, characterized in that a bearing element (33) is arranged on the pole core (30).

15. Damping adjustment device (2) according to one of the preceding claims, characterized in that the pole body (20) comprises a magnetic bottleneck (35).

16. Damping adjustment device (2) according to one of the preceding claims, characterized in that the polar body (20) is in one piece.

17. Damping adjustment device (2) according to one of the preceding claims or according to the preamble of claim 1, characterized in that the armature (55) has at least one projection (57) on an outer circumferential surface (56) and / or the pole body (20) has at least one projection (57) on an inner circumferential surface.

18. Damping adjustment device (2) according to claim 17, characterized in that the at least one projection (57) completely surrounds the armature (55) and / or that the at least one projection (57) is arranged along the longitudinal axis (L) approximately centrally to the armature (55).

19. Damping adjustment device (2) according to claim 17 or 18, characterized in that at least two projections (57) are arranged spaced apart from one another along the longitudinal axis (L).

20. Vibration damper (1) with a damping adjustment device (2) according to one of the preceding claims.

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