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), 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 armature (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 a longitudinal axis (L) in the armature space (40) when the excitation coil (50) is energized, wherein 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 space (40), and wherein the venting channel (80) is guided through the pin (70). Furthermore, the present invention relates to a vibration damper.

Description

[0001] 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.

[0002] Damping adjustment devices are 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 widely used, particularly in vehicles, and are intended to increase ride comfort and contribute to driving safety. For this purpose, a chassis control unit can individually adjust the damping behavior of each individual wheel on an axle using data from, among other things, acceleration and displacement sensors. In this way, vibrations generated by the vehicle's movement along the road are damped, increasing ride comfort and driving safety.

[0003] Prior art vibration dampers typically comprise a vibration damper tube in which a damping adjustment device is mounted on 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, together with it, 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 actuator arranged in an outer housing with an excitation coil and an armature. Depending on the electric current, the excitation coil can move the armature in an armature chamber of a pole body to open or close a valve in a main stage. The movement of the armature can regulate the pressure applied to the main stage. In this way, the oil pressure in the damping tube can be regulated, and a softer or harder damping can be set by the vibration damper.

[0004] The actuating device is usually supplied via electrical cables that are routed through the piston rod and through parts of the damping adjustment device to the excitation coil.

[0005] Since the damping adjustment device is arranged within the damping tube filled with damping oil, the damping adjustment device must be sealed against the damping oil in such a way that the oil does not penetrate into a coil space in which the excitation coil is arranged and impair the functionality of the damping adjustment device.

[0006] Furthermore, air bubbles may be trapped in the damping oil or may form (e.g.), which, particularly if they penetrate into an armature chamber, can 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. Due to the different viscosity and pressure-temperature-volume properties of the damping oil and the air bubbles, the characteristic curve of the electromagnetic actuator is altered.

[0007] Document DE 10 2016 104 338 A1 teaches a generic damping adjustment device for a vibration damper, comprising an outer housing with a receiving area, a pole body forming an armature chamber, an excitation coil, and an armature. The pole body is inserted into the receiving area to form a coil chamber in which the excitation coil is arranged, and the armature is movable along a longitudinal axis in the armature chamber when the excitation coil is energized. To vent the armature chamber, the pole body has a venting channel, which opens into a venting bore in the outer housing.

[0008] Further prior art is represented by the documents DE 14 14 722 A and JP S58 166 184 A.

[0009] This is where the present invention comes in

[0010] 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.

[0011] 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.

[0012] Further advantageous embodiments of the present invention are the subject of the subclaims.

[0013] The damping adjustment device for a vibration damper according to the invention comprises an outer housing with a receiving area and a cup-shaped pole body forming an armature chamber. The outer housing has an outer side and an inner side, with the inner side surrounding the receiving area.

[0014] 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.

[0015] The cup-shaped pole body is further inserted into the receiving area of ​​the outer housing, forming a preferably hollow-cylindrical coil space, preferably through an open end of the outer housing. 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 inserted into the receiving area of ​​the outer housing with the pole body during assembly of the damping adjustment device.

[0016] Furthermore, it may be advantageous if the position of the pole body in the outer housing is defined 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 defines the position of the pole body relative to the outer housing. This ensures that a defined routing for the electrical lines for powering the excitation coil is achieved.

[0017] Furthermore, it has proven advantageous to provide a venting channel for venting the armature chamber. The venting channel preferably connects the armature chamber to an outer side of the outer housing and opens 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.

[0018] Furthermore, it has proven advantageous if the venting channel extends through the pin. For this purpose, the pin can be hollow along its longitudinal axis and form a section of the venting channel in the manner of a tube.

[0019] The proposed damping adjustment device is based on the idea of ​​combining the position fixation of the pole body with the ventilation of the armature chamber, thus allowing for a particularly simple and compact design. In particular, the recesses or holes required for the position fixation of the pole body and the ventilation channel can be created in a single work step, which significantly simplifies the manufacturing process.

[0020] 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 inner side of the outer housing, and more preferably, the second recess is formed on an end face on an outer side of the pole body.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] A further development of the present invention provides that the venting channel in the pin has a first section and a second section, wherein the second section forms a throttle. In particular, it is preferred if the ratio of the flow-through line cross-sections to the formation of the throttle is 1:5. Throttle diameters 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 flowing through the venting channel can be adjusted. The proposed venting can be designed without a valve, in particular without a check valve.

[0025] Furthermore, it has proven advantageous for the pole body to comprise a base section that closes off the armature chamber 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 thus has an open side and a closed side, with the closed side being formed by the base section.

[0026] 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.

[0027] According to a further development, the plunger can preferably be hollow-cylindrical and can have an opening along the longitudinal axis.

[0028] 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 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. Preferably, a free end of the plunger projects into the collecting chamber, whereby the latter can be ventilated and / or vented through the opening in the plunger.

[0029] 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 chamber on the side opposite the first bearing section, thereby facilitating the drainage of accumulated media from the collecting chamber through the venting channel.

[0030] Furthermore, it has proven advantageous if the venting channel comprises a second connecting line which connects the second recess and the collecting chamber, 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 chamber. 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.

[0031] It has also proven advantageous if the venting channel comprises a first connecting line arranged or formed in the outer housing. The first connecting line opens 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 in the longitudinal axis with respect to the armature chamber on a side opposite an open end of the cup-shaped outer housing.

[0032] 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.

[0033] 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.

[0034] Furthermore, it has proven advantageous if the cup-shaped pole body includes 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 chamber.

[0035] 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 seal the coil space.

[0036] 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 formed between an outer surface of the armature and an inner surface of the pole body or pole tube section. The projection can reduce vibrations of the armature without significantly affecting the switching behavior of the armature.

[0037] The width of the running gap influences the dynamics of the armature's movement, which depends particularly on the viscosity of the damping oil surrounding the armature. Wide running gaps reduce this dependence, but it has been shown that wide running gaps promote armature vibrations. The at least one projection inhibits armature vibrations in a plane perpendicular 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.

[0038] 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.

[0039] 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.

[0040] 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, which can inhibit vibrations in all directions in the plane transverse to the longitudinal axis.

[0041] A further development of the present invention provides that at least two projections are arranged spaced apart from one another along the longitudinal axis.

[0042] A further aspect of the present invention relates to a vibration damper with a damping adjustment device according to one of the preceding claims.

[0043] 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: Fig. 1 a sectional view of a damping adjustment device according to a first embodiment, Fig. 2 a sectional view of a damping adjustment device according to a second embodiment, Fig. 3 a detailed view of an armature of the damping adjustment device according to the Fig. 1 and Fig. 2, Fig. 4 a detailed view of an armature of the damping adjustment device according to a first development of the armature, and Fig. 5 a detailed representation of an armature of the damping adjustment device according to a second development of the armature.

[0044] Identical or functionally equivalent parts or features are identified by the same reference numerals in the following detailed description of the figures. Likewise, not all identical or functionally equivalent parts or features are provided with a reference numeral in the figures.

[0045] Fig. 1 shows a first exemplary embodiment of a damping adjustment device 2 for a vibration damper 1, which is only partially shown.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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).

[0050] The pole body 20 is cup-shaped and can include 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Like the Fig. 1 and Fig. 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.

[0056] The armature 55 is held mounted on the first bearing section 31 and the second bearing section 32 by means of a tappet 54, wherein the respective bearing section 31, 32 can have a bearing element 33.

[0057] The dimensioning of the running gap has a significant influence on the dynamics of the damping adjustment device 1.

[0058] The smaller the running gap, the more the viscosity of the damping oil influences the dynamic behavior. Larger running gaps increase armature vibrations.

[0059] To avoid armature vibrations, the armature 55 has - as in Fig. 3 - has 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 anchor 55.

[0061] Further training of the anchor 55 will be offered in the Fig. 4 and Fig. 5, where Fig. 4 shows several tooth- or prong-shaped projections 57 which are arranged spaced apart from one another in the longitudinal axis L. A single projection 57, see Fig. 5, on the outer 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, the Fig. 1 and Fig. 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 in a fixed position 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 which seals the coil chamber 45 enclosed by the pole body 20 and the outer housing 10 in a media-tight manner.

[0067] The excitation coil 50 can be energized by means of electrical lines 52, wherein the electrical lines 52 are preferably led centrally through the piston rod 8 and the outer housing 10 - as in the Fig. 1 and Fig. 2 is indicated - 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 - as already explained - is achieved by the pin 70.

[0070] Furthermore, a vent is provided for the armature chamber 40. The vent comprises a vent channel 80 formed by a conduit formed in the pole body 20 and the outer housing 10. The vent channel 80 extends 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.

[0071] The venting channel 80 connects the armature chamber 40 with 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.

[0072] 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, wherein the second section 72 forms a throttle 75 through which a volume flow through the vent channel 80 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 80, 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 exterior space 5 by means of a first connecting line 81. The first connecting line 81 is inserted into the outer housing 10 and can be radially oriented. The first connecting line 81 opens at one end into the outer side 18 of the outer housing 10 and at the other end into the first recess 12.

[0077] The second recess 22 is connected to the armature chamber 40 by means of a second connecting line 88. The second connecting line 82 is inserted into the pole body 20 and can be arranged axially or inclined to the longitudinal axis L. The second connecting line 82 is connected to the armature chamber 40 and opens at the other end into the second recess 22.

[0078] 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.

[0079] Fig. 1 that, according to the first embodiment, a collecting space 48 is formed between the first bearing section 31 and the base section 26.

[0080] 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. Air bubbles therefore do not collect 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.

[0081] The second embodiment according to Fig. 2 differs from the first embodiment according to Fig. 1 in that the second connecting line 82 opens directly into the armature chamber 40.

[0082] More precisely, the vent 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 area of ​​the armature chamber 40. Air bubbles collect in this recess 44. List of reference symbols 1 vibration damper 2 Damping adjustment device 5 Outdoor space 8 Piston rod 10 outer casings 11 open end of 10 12 first recess 13 first seal 15 Recording area 17 Inside 18 Outside 20 polar bodies 21 open end of 20 22 second recess 23 second seal 26 floor section 27 Pole tube section 28 Flange section 30 pole cores 31 first camp section 32 second camp section 33 Bearing element 34 Coil chamber seal 35 magnetic bottleneck 38 grooves 40 anchor room 45 coil space 48 Assembly room 50 Excitation coil 52 electrical cable 54 tappets 55 anchors 56 lateral surface 57 lead 70 pen 71 first section 72 second section 73 Ring groove 75 Throttle 80 ventilation duct 81 first connecting line 82 second connecting line L Longitudinal axis

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 by , 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 by 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 by 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 by 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 by 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 by that the vent 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 by 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 by 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 by that the vent channel (80) opens into the collecting chamber (48). [10] Damping adjustment device (2) according to one of the preceding claims, characterized byin that the venting channel (80) comprises a first connecting line (81) 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 by that the venting channel (80) comprises a second connecting line (82) which connects the recess (22) 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 by that a flange section (32) is formed at an open end (21) of the pole body (20), and 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 by 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 by 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 by that the polar body (20) comprises a magnetic bottleneck (35). [16] Damping adjustment device (2) according to one of the preceding claims, characterized by 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 by that the armature (55) has at least one projection (57) on an outer surface (56) and / or the pole body (20) has at least one projection (57) on an inner surface. [18] Damping adjustment device (2) according to claim 17, characterized by that the at least one projection (57) completely surrounds the anchor (55) and / or that the at least one projection (57) is arranged along the longitudinal axis (L) approximately centrally to the anchor (55). [19] Damping adjustment device (2) according to claim 17 or 18, characterized by 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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